CA2087990A1 - Process and apparatus for forming selvage of separable fastener - Google Patents
Process and apparatus for forming selvage of separable fastenerInfo
- Publication number
- CA2087990A1 CA2087990A1 CA 2087990 CA2087990A CA2087990A1 CA 2087990 A1 CA2087990 A1 CA 2087990A1 CA 2087990 CA2087990 CA 2087990 CA 2087990 A CA2087990 A CA 2087990A CA 2087990 A1 CA2087990 A1 CA 2087990A1
- Authority
- CA
- Canada
- Prior art keywords
- separable fastener
- selvages
- fastening elements
- separable
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
- D06H7/00—Apparatus or processes for cutting, or otherwise severing, specially adapted for the cutting, or otherwise severing, of textile materials
- D06H7/04—Apparatus or processes for cutting, or otherwise severing, specially adapted for the cutting, or otherwise severing, of textile materials longitudinally
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B18/00—Fasteners of the touch-and-close type; Making such fasteners
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process for forming selvages on the surface of a separable fastener comprising a substrate comprising a thermoplastic resin and, provided vertically on the surface thereof, a multiplicity of fastening elements comprising a thermoplastic resin, which comprises, while conveying said separable fastener in the longitudinal direction, internally heating said separable fastener along the conveying path and, at the same time, pressing said fastening elements onto said substrate to form flat parts that will constitute selvages, with a plurality of press rolls provided in a spaced relationship with each other in the widthwise direction of said separable fastener; and an apparatus therefor. This process assures continuous operation of forming smooth and flat selvages.
A process for forming selvages on the surface of a separable fastener comprising a substrate comprising a thermoplastic resin and, provided vertically on the surface thereof, a multiplicity of fastening elements comprising a thermoplastic resin, which comprises, while conveying said separable fastener in the longitudinal direction, internally heating said separable fastener along the conveying path and, at the same time, pressing said fastening elements onto said substrate to form flat parts that will constitute selvages, with a plurality of press rolls provided in a spaced relationship with each other in the widthwise direction of said separable fastener; and an apparatus therefor. This process assures continuous operation of forming smooth and flat selvages.
Description
~087990 A PROCESS AND APPARATUS FOR FORMIN~ SELVAGE OF sEpARAsLE
FASTENER
BACKGROUND OF THE INVENTION
Field of the invention The present invention relates to a process and apparatus for forming sel~ages that constitutes a part to be stitched together with clothin~, on the surface of a separable fastener.
Separable fasteners comprise a substitute and, provided by weaving or knitting on the surface thereof, loop-like or hook-like fastening elements and are used for engaging two ltems with each other, in place of buttons and the like.
FIGURE 3 shows an example of such separable fasteners.
In FIGURE 3 (a), a separable fastener 1 isr for exam-ple, a female separable fastener and comprises a substrate 11 and, projecting on the surface 1a thereof, a multiplicity of loop-like fastening elements 12. On the back surface lb of the separable fastener 1/ there is providad a coating layer (not shown) to prevent the fastening elements 12 from dropping off from the substrate 11. These substrate 11, fastening elements 12 and coating layer generally comprise Z5 thermoplastic resins such as polyester and polyurethane.
The separable fastenex 1 is provided, in the longitudinal direction A, with selvages that constitute a joining part to be stitched with a wear or like items. The separable 20879'i~
fastener 1 is obtained by slitting a wider one as shown inFIGURE 3 (b) along its length A and at the middle of flat parts 14, which parts form, aftar the slitting, the sel-vages. A known process for forming the selvage 13 comprises slitting a wide separable fastener 1 into a plurality of narrow shapes and then, with circular cutters 50 provided on both sides of the narrow separable fastener 1B, forming selvages 13 on both edges of the separable fastener 1B, as shown in FIGURE 4 (see for example ~apanese Patent Applica-tion Laid-open No. 46114/1972). Also known is a process which comprises, as shown in FIGURE 5, contacting the knives 52 of an electric hair clipper 51 on the surface of a wide separable fastener lA to remove the fastening elements and then slitting with a cutter 53 the separable fastener 1A
into narrow separable fasteners 1B (see for example Japanese Patent Application Laid-open No. 14438/1975).
The substrate 11 of separable fasteners 1A and 1B
generally have, however, wavy-pattern projections or an irregular surface. As a result, with the above known processes, there sometimes remains root part of some of fastening elements, so that the selvage 13 cannot always be sufficiently flattened.
Further with separable fasteners having loop-like fastening elements, i.e. female separable fasteners, the flexible fastening elements renders it difficult to cut the elements at the roots. In this case either, a sufficiently fla-t selvage 13 cannot be formed.
.. . .
'- . , ' " ' . ` `, ' ' , . . ~ .
Japanese Patent Application Laid open No. 14438/1975 discloses, to solve the above problem, a process which comprises removing fastening elements 12 with an electric hair clipper 51 and, thereafter, flattening the roughened surface, where the elements have been removed, by electric fusion. This process, however, requires an additional step -for flattening, which is uneconomical.
Japanese Patent Application Laid-open No. 194802/1987 discloses a process which comprises contacting a rotating grinding wheel 54 onto the surface 1a of a separable fastener 1A, as shown in FIGUR3 6, to remove the fastening elements at the roots. This process, however, causes clogging on the surface of the grinding wheel 54 due to fine chips of the removed fastening elements 12, although most of the chips are removed through a suction duct 55. Then, a continuous operation becomes difficult to maintain.
Accordingly, an object of the present invention is to solve the above problems and provide a process and apparatus that can form sufficiently flat selvages 13 on the surface of separable fasteners continuously.
Thus, the present invention provides a process for forming selvages, which comprises, while conveying a separable fastener in the longitudinal direction, internally heating the separable fastener along the conveying path A
and, at the same time, fusing the fastening elements 12 with the substrate 1'I by pressing the fastening elements 12 onto the substrate 1l to form flat parts 14 that will constitute 20~7~90 selvages 13, with a plurality of press rolls 4 provided in a spaced relationship with each other in the widthwi~e direc-tion of the separable fastener (hereinafter this process is referred to as "flat part-forming process").
On this occasion, there may be employed a process which comprises, at the same time with or after the above formation of flat parts, slitting the middle part of each of the flat parts along the conveying path, thereby forming selvages along the cut edges (hereinafter this process is referred to as "slitting process").
The present invention also provides an apparatus for forming selvages, which comprises:
a conveying device for conveying a separable fastener in the longitudinal direction, an internal heating device, provided near the conveying path of the separable fastener, for heating the separable fastener from its inside and along the conveying path A, a support that contacts the back surface of the heated separable fastener and a press rolI that contacts the surface of the separable fastener and presses the separable fastener between the above support and fuses the f.astening elements onto the : substrate, to form on the separable fastener a flat part 14 that will constitute selvages 13.
BRXEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many .. . . . . .
20~7990 of the attendant advantages thereof will be readily obtained as the same become better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
FIGURE 1 is a perspective view showing an example of the apparatus for forming selvages of separable faster according to the present invention;
FIGURE 2 is a side view showing the essential part of the apparatus for forming selvages according to the present invention;
FI~,URE 3 .is a perspective view showing an example of separable fastener;
FIGURE 4 is a plan showing a first example of conventional apparatuses;
FIGURE 5 is a side view showing a second example of conventional apparatuses; and FIGURE 6 is a cross-sectional view showing a third example of conventional apparatuses.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In FIGURE 1, a separable fastener 1 comprising a substrate 11 and, on its surface 1a, fastening elements 12 has been wound on an unwinding roll 21. The separable fastener 1 is guided through guide rolls 22 and 23 and taken up on a winding roll 24. These rolls 21 through 24 constitute the conveying device 2 c~ntained in the apparatus oE the present invention. The conveying device 2 is to '''i:' .'~. , ''' , , ''`'~ ~, :~' .: ' ' ''' :. ~ ` :.
:~ ~.: : ... : ~ . - : , : . '' .. :
FASTENER
BACKGROUND OF THE INVENTION
Field of the invention The present invention relates to a process and apparatus for forming sel~ages that constitutes a part to be stitched together with clothin~, on the surface of a separable fastener.
Separable fasteners comprise a substitute and, provided by weaving or knitting on the surface thereof, loop-like or hook-like fastening elements and are used for engaging two ltems with each other, in place of buttons and the like.
FIGURE 3 shows an example of such separable fasteners.
In FIGURE 3 (a), a separable fastener 1 isr for exam-ple, a female separable fastener and comprises a substrate 11 and, projecting on the surface 1a thereof, a multiplicity of loop-like fastening elements 12. On the back surface lb of the separable fastener 1/ there is providad a coating layer (not shown) to prevent the fastening elements 12 from dropping off from the substrate 11. These substrate 11, fastening elements 12 and coating layer generally comprise Z5 thermoplastic resins such as polyester and polyurethane.
The separable fastenex 1 is provided, in the longitudinal direction A, with selvages that constitute a joining part to be stitched with a wear or like items. The separable 20879'i~
fastener 1 is obtained by slitting a wider one as shown inFIGURE 3 (b) along its length A and at the middle of flat parts 14, which parts form, aftar the slitting, the sel-vages. A known process for forming the selvage 13 comprises slitting a wide separable fastener 1 into a plurality of narrow shapes and then, with circular cutters 50 provided on both sides of the narrow separable fastener 1B, forming selvages 13 on both edges of the separable fastener 1B, as shown in FIGURE 4 (see for example ~apanese Patent Applica-tion Laid-open No. 46114/1972). Also known is a process which comprises, as shown in FIGURE 5, contacting the knives 52 of an electric hair clipper 51 on the surface of a wide separable fastener lA to remove the fastening elements and then slitting with a cutter 53 the separable fastener 1A
into narrow separable fasteners 1B (see for example Japanese Patent Application Laid-open No. 14438/1975).
The substrate 11 of separable fasteners 1A and 1B
generally have, however, wavy-pattern projections or an irregular surface. As a result, with the above known processes, there sometimes remains root part of some of fastening elements, so that the selvage 13 cannot always be sufficiently flattened.
Further with separable fasteners having loop-like fastening elements, i.e. female separable fasteners, the flexible fastening elements renders it difficult to cut the elements at the roots. In this case either, a sufficiently fla-t selvage 13 cannot be formed.
.. . .
'- . , ' " ' . ` `, ' ' , . . ~ .
Japanese Patent Application Laid open No. 14438/1975 discloses, to solve the above problem, a process which comprises removing fastening elements 12 with an electric hair clipper 51 and, thereafter, flattening the roughened surface, where the elements have been removed, by electric fusion. This process, however, requires an additional step -for flattening, which is uneconomical.
Japanese Patent Application Laid-open No. 194802/1987 discloses a process which comprises contacting a rotating grinding wheel 54 onto the surface 1a of a separable fastener 1A, as shown in FIGUR3 6, to remove the fastening elements at the roots. This process, however, causes clogging on the surface of the grinding wheel 54 due to fine chips of the removed fastening elements 12, although most of the chips are removed through a suction duct 55. Then, a continuous operation becomes difficult to maintain.
Accordingly, an object of the present invention is to solve the above problems and provide a process and apparatus that can form sufficiently flat selvages 13 on the surface of separable fasteners continuously.
Thus, the present invention provides a process for forming selvages, which comprises, while conveying a separable fastener in the longitudinal direction, internally heating the separable fastener along the conveying path A
and, at the same time, fusing the fastening elements 12 with the substrate 1'I by pressing the fastening elements 12 onto the substrate 1l to form flat parts 14 that will constitute 20~7~90 selvages 13, with a plurality of press rolls 4 provided in a spaced relationship with each other in the widthwi~e direc-tion of the separable fastener (hereinafter this process is referred to as "flat part-forming process").
On this occasion, there may be employed a process which comprises, at the same time with or after the above formation of flat parts, slitting the middle part of each of the flat parts along the conveying path, thereby forming selvages along the cut edges (hereinafter this process is referred to as "slitting process").
The present invention also provides an apparatus for forming selvages, which comprises:
a conveying device for conveying a separable fastener in the longitudinal direction, an internal heating device, provided near the conveying path of the separable fastener, for heating the separable fastener from its inside and along the conveying path A, a support that contacts the back surface of the heated separable fastener and a press rolI that contacts the surface of the separable fastener and presses the separable fastener between the above support and fuses the f.astening elements onto the : substrate, to form on the separable fastener a flat part 14 that will constitute selvages 13.
BRXEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many .. . . . . .
20~7990 of the attendant advantages thereof will be readily obtained as the same become better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
FIGURE 1 is a perspective view showing an example of the apparatus for forming selvages of separable faster according to the present invention;
FIGURE 2 is a side view showing the essential part of the apparatus for forming selvages according to the present invention;
FI~,URE 3 .is a perspective view showing an example of separable fastener;
FIGURE 4 is a plan showing a first example of conventional apparatuses;
FIGURE 5 is a side view showing a second example of conventional apparatuses; and FIGURE 6 is a cross-sectional view showing a third example of conventional apparatuses.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In FIGURE 1, a separable fastener 1 comprising a substrate 11 and, on its surface 1a, fastening elements 12 has been wound on an unwinding roll 21. The separable fastener 1 is guided through guide rolls 22 and 23 and taken up on a winding roll 24. These rolls 21 through 24 constitute the conveying device 2 c~ntained in the apparatus oE the present invention. The conveying device 2 is to '''i:' .'~. , ''' , , ''`'~ ~, :~' .: ' ' ''' :. ~ ` :.
:~ ~.: : ... : ~ . - : , : . '' .. :
2~87990 unwind the separable fastener 1 and convey it in the longitudinal direction A.
At a position in the conveying path for the separable fastener 1, an internal heating device 3 is provided in such a condition as to contact the back surface 1b of the sepa-rahle fastener 1. The internal heating devic0 3 comprises, for example an ultrasonic oscillator or high-frequency oscillator and oscillates supersonic wave or high-frequency oscillation from the horn 31 (support) at the top and internally heats the separ.able fastener I in the conveying direction A to elevate its temperature. In this embodiment, the top surface of the horn 31 contacts, as shown in FIGURE
2, with the back surface 1b of the separable fastener 1.
The horn 31 may be made of titanium alloy capable of forming highly flat selvages 13~ It is advisable to cover with - Teflon the surf.ace of the horn 31 that contacts the back surface 1b of the separable fastener 1.
On the surface 1a of the separable fastener 1 and oppo-site to the position of the horn 31, a plurali.ty of pressrolls 4 that contact with the surface 1a of the separable fastener 1. The press rolls 4 press the .separable fastener 1 against the horn 31 and fuse or weld the heated fastening elements 12 onto the substrate 11, to form, as shown in FI-GURE 1, flat parts 14 on the separable fastener 1 that willform selvages 13 later on. The press rolls 4 are mounted~
- in a plural number and in a spaced relationship with each other in the widthwise direction B of the separaole fastener ', 'i ' ' ' ', "'.'' '';~' " ~ '', ' ''' " '. ' ', ' ' ' '':, . ' . ' .
2~87990 1, on a rotating shaft 41 driven by a motor. The roll width of the press rolls ~ is nearly the same as the width of the flat parts 14 to be formed, and the pitch of the press rolls 4 is the same as the pitch of the flat parts 14. While the press rolls 4 are made of stainless steel, their surface that contacts the surface 1a of the separable fastener may be covered with Teflon to increase releasability.
At a position in the downstream side of the press rolls 4, a cooling pipe 5 is mounted in the widthwise direction B
of the separable fastener. The cooling pipe 5 is, as shown in FIGU~E 2, provided in the above widthwise direction B
with a multiplicity (for instance at least the number of the flat parts 14 to be formed of the separable fastener) of nozzles 5a (for instance, circular diffusers having a dia-meter of 5 to 10 mm) that blow out air C cooled by adiabatic expansion of compressed air or like methods (for instance, at a temperature of -20 to 0C and at a speed of 3 to lO
m/sec~. It is desirable to cool locally the flat parts and their vicinity just after heating and pressing, and hence it is preferable to provide the nozzles 5a for every flat part 14, i.e. for every press roll 4. The positions of the nozzles 5a may, for cooling devices that comprise a cooling pipe 5 and, connected thereto through flexible tubes or movable pipes, the nozzles 5a, be changed conforming to the intended positions of the flat parts 14 or depending on the type of the separable fastener.
The process for forming selvages of the present . .
20~79go invention is described next.
The separable fastener 1 is, while being conveyed in the conveying direction A from an unwind roll 21 to take-up roll 24 through the conveying devic~ 2 shown in FIGURE 1, internally heated with an internal heating device 3. At the .same time with the separable fastener 1 being heated to an elevated temperature, the fastening elements 12 are pressed with press rolls 4 against the substrate 11, thereby integrally fusing with the substrate 11. As a result, flat parts 14 that will become selvages 13 are formed on the surface 1a of the separable fastener 1.
It is desirable that the clearance between the press rolls 4 and the horn 31 is in a range of from (the thickness of the substrate 11 before pressing + 0.2 mm) to (the thickness of the substrate 11 before pressing - 0.2 mm).
i .
This range assures good fusibility of the fastening elements with substrate 11, thereby providing flat parts 14 having good smooth surface. The clearance is more preferably in a range of from (the thickness of the substrate 11 before pressing + 0.2 mm) to (the thickness of the substrate 11 before pressing - 0.1 mm).
There may be provided, together with the above device for forming flat parts and in a suitable position, a cutter, high frequency fusing cutter or ultrasonic fusing cutter.
By using this cutter, the middle of each of the flat parts 14 is, at the same time with or after their formation, slit in the conveying direction A, whereby narrow sepaxable 2~7~0 fasteners 1B having selvages 13 on both sides thereof are produced, as shown in FIGURE 3(a).
In the above embodiment, the fastening elements 12 are fused with the substrate 11 in such a manner, as shown in FIGURE 2, that the heated separable fastener 1 is flattened between the horn 31 and the press rolls 4. This process therefore is capable of forming sufficiently flat selvages 13 by pushing down fastening elements 12, even when the substrate has wavy-pattern projections or irregular surface or when the fastening elements 12 are flexible loop-like elements~
Since the process of the invention comprises fusing the fastening elements 12 with the substrate 11, there occurs no troubles such as clogging of grinding wheel with chips and it is possible to carry out continuous operation.
The process provides another advantage of causing no loosening of fastening elements 12 upon stitching, since, then, the selvage including a coating layer on its back surface lb has once fused.
One may consider heating the separable fastener 1 by external heating, not by internal heating. External heating, howeverf has the drawbacks such as temperature ele-vation of fastening elements 12 alone that has large surface area and small heat capacity. On the other hand, the present invention employs internal heating, which realizes integral and comparatively uniform temperature elevation free from the above drawback.
, . ~
2 0 ~ 0 After the above press1ng and fusing steps, there may occur the following troubles.
The fastening elements 12 may, because of its small heat capacity, elevate its temperature to an extent unneces-sary or break upon.contact with press rolls 4 at an elevatedtemperature. Wavy-pattern projections or warping may generate in the flat parts 14 or wide separable fastener 1 (1A) itself due to variation in the conveying speed among a plurality of portions (that will, after slitting, become narrow separable fasteners.1B) containing rows of fas~ening elements and sandwiched by adjacent flat parts 14. This is because that the wide separable fastener 1 (1A) is under tension in the conveyin-g direction A, which is not always uniform in the widthwise direction B; and that, when the wide separable fastener 1 is heated and pressed bet~,e~.-n the press rolls 4 and horn 31, the flattened parts 14 of the substrate 11 will soften. Such wavy pattern or warping forms more readily, the longer the flat parts 14 being in a softened condition. This phenomena may hinder the formation of narrow separable fasteners 1B with selvages having neat appearance.
To solve the above problem, this embodiment of the present invention provides blow-out nozzles 5a that blow cool air C against the flat parts 14 just after contact of the press rolls 4 and the separable fastener 1. The cooling prevents the fastening elements 12 from being damaged by heat and also the flat parts 14 from genarating the above -~o-.. . . .
20~79~0 wavy pattern or warping upon continuous ~ormation of selvages 13.
While in the above embodiment the separable fastener 1 is pressed at the same time with internal heating, in the present invention the separable fastener may be pressed just after internal heating.
The process of the present invention is also applicable to male separable fasteners having hook-like or mushroom type fastening elements. For male separable fasteners having hook-like fastening elements comprising synthetic monofilament, in the present invention, the hook formation process can be combined with the above flat part-forming process and slitting process, whereby narrow separable (male) fasteners lB having selvages on both sides thereof can be continuously produced.
In the above continuous process, while the hook forma-tion process can be provided before the above flat part-forming process, it is preferably provided after the flat part-forming process. The superiority of the latter combination is because the uniformity of the pushing down directions of fastening elements differs depending cn the shape of the fastening elements and that loop-like fastening elements (precursor of hooks before cutting) are pushed down more uniformly by heat pressing than hook-like fastening elements (after cutting of loops), which have only one leg, so that the hoo]c formation after flat part-forming process can give selvages having more uniform appearance. The 20~7~90 . .
latter combination further has the advantage of assuring good smoothness of the flat parts. This is because that the fastening elements to be pushed clown and flattened by heat pressing are of loop shape and hence fuslon of onl~ part of each loop to the substrate 11 fixes the entire loop, laying flat, on the substrate surface. On the other hand, the above former combination must, in order to complete pushing down, fuse 2 pieces of monofllament projections remaining after cutting off of part of the side of a loop comprising a monofilament.
The hook formation process may be, after flat part-forming process, provided either before or after the slitting process, but it is preferable to provide it before slitting, which assures integral, compact provision of the loop-cutting device.
In the above hook formation process, loops comprising monofilament are, as the separable fastener is conveyed in the direction A, permitted to pass through needle-like sta-Z0 tionary knives provided in the widthwise direction B of theseparable fastener in a number corresponding to the number of the rows of the loops and in positions each contacting the point on one side of a loop to be cut, to form hooks.
In this embodiment, the above needle-like stationary knife is employed as cutting means for cutting loops comprising monofilament into hooks, because this system realizes high conveying speed, i.e. high productivity, utilizing the feature of the present invention capable of continuously 2087~90 forming a plurality of narrow separable fasteners hav.ing smooth selvages on both sides thereof. Other processes may, however, also be used, such as one using a hair clipper (see ~or example Japanese Patent Publication No. 13511/1967) and one comprising combination of a vibrating knife emitting ultrasonic fine vibration and a stationary knife (see for example Japanese Patent Publication No. 12603/1982).
- According to the present lnvention, separable fasteners with various sizes can be produced by changing the mounting pitch and/or roll width of the press rolls 4 shown in FIGURE
1.
It is needless to sa~, in the present invention, that the temperature of the separable fastener 1 should be maintained within a range that assures fusibility of the materials of the separable fastener and no melt down of the substrate l1 to rigid shape.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention ma~ be practiced otherwise than as specifically described herein.
At a position in the conveying path for the separable fastener 1, an internal heating device 3 is provided in such a condition as to contact the back surface 1b of the sepa-rahle fastener 1. The internal heating devic0 3 comprises, for example an ultrasonic oscillator or high-frequency oscillator and oscillates supersonic wave or high-frequency oscillation from the horn 31 (support) at the top and internally heats the separ.able fastener I in the conveying direction A to elevate its temperature. In this embodiment, the top surface of the horn 31 contacts, as shown in FIGURE
2, with the back surface 1b of the separable fastener 1.
The horn 31 may be made of titanium alloy capable of forming highly flat selvages 13~ It is advisable to cover with - Teflon the surf.ace of the horn 31 that contacts the back surface 1b of the separable fastener 1.
On the surface 1a of the separable fastener 1 and oppo-site to the position of the horn 31, a plurali.ty of pressrolls 4 that contact with the surface 1a of the separable fastener 1. The press rolls 4 press the .separable fastener 1 against the horn 31 and fuse or weld the heated fastening elements 12 onto the substrate 11, to form, as shown in FI-GURE 1, flat parts 14 on the separable fastener 1 that willform selvages 13 later on. The press rolls 4 are mounted~
- in a plural number and in a spaced relationship with each other in the widthwise direction B of the separaole fastener ', 'i ' ' ' ', "'.'' '';~' " ~ '', ' ''' " '. ' ', ' ' ' '':, . ' . ' .
2~87990 1, on a rotating shaft 41 driven by a motor. The roll width of the press rolls ~ is nearly the same as the width of the flat parts 14 to be formed, and the pitch of the press rolls 4 is the same as the pitch of the flat parts 14. While the press rolls 4 are made of stainless steel, their surface that contacts the surface 1a of the separable fastener may be covered with Teflon to increase releasability.
At a position in the downstream side of the press rolls 4, a cooling pipe 5 is mounted in the widthwise direction B
of the separable fastener. The cooling pipe 5 is, as shown in FIGU~E 2, provided in the above widthwise direction B
with a multiplicity (for instance at least the number of the flat parts 14 to be formed of the separable fastener) of nozzles 5a (for instance, circular diffusers having a dia-meter of 5 to 10 mm) that blow out air C cooled by adiabatic expansion of compressed air or like methods (for instance, at a temperature of -20 to 0C and at a speed of 3 to lO
m/sec~. It is desirable to cool locally the flat parts and their vicinity just after heating and pressing, and hence it is preferable to provide the nozzles 5a for every flat part 14, i.e. for every press roll 4. The positions of the nozzles 5a may, for cooling devices that comprise a cooling pipe 5 and, connected thereto through flexible tubes or movable pipes, the nozzles 5a, be changed conforming to the intended positions of the flat parts 14 or depending on the type of the separable fastener.
The process for forming selvages of the present . .
20~79go invention is described next.
The separable fastener 1 is, while being conveyed in the conveying direction A from an unwind roll 21 to take-up roll 24 through the conveying devic~ 2 shown in FIGURE 1, internally heated with an internal heating device 3. At the .same time with the separable fastener 1 being heated to an elevated temperature, the fastening elements 12 are pressed with press rolls 4 against the substrate 11, thereby integrally fusing with the substrate 11. As a result, flat parts 14 that will become selvages 13 are formed on the surface 1a of the separable fastener 1.
It is desirable that the clearance between the press rolls 4 and the horn 31 is in a range of from (the thickness of the substrate 11 before pressing + 0.2 mm) to (the thickness of the substrate 11 before pressing - 0.2 mm).
i .
This range assures good fusibility of the fastening elements with substrate 11, thereby providing flat parts 14 having good smooth surface. The clearance is more preferably in a range of from (the thickness of the substrate 11 before pressing + 0.2 mm) to (the thickness of the substrate 11 before pressing - 0.1 mm).
There may be provided, together with the above device for forming flat parts and in a suitable position, a cutter, high frequency fusing cutter or ultrasonic fusing cutter.
By using this cutter, the middle of each of the flat parts 14 is, at the same time with or after their formation, slit in the conveying direction A, whereby narrow sepaxable 2~7~0 fasteners 1B having selvages 13 on both sides thereof are produced, as shown in FIGURE 3(a).
In the above embodiment, the fastening elements 12 are fused with the substrate 11 in such a manner, as shown in FIGURE 2, that the heated separable fastener 1 is flattened between the horn 31 and the press rolls 4. This process therefore is capable of forming sufficiently flat selvages 13 by pushing down fastening elements 12, even when the substrate has wavy-pattern projections or irregular surface or when the fastening elements 12 are flexible loop-like elements~
Since the process of the invention comprises fusing the fastening elements 12 with the substrate 11, there occurs no troubles such as clogging of grinding wheel with chips and it is possible to carry out continuous operation.
The process provides another advantage of causing no loosening of fastening elements 12 upon stitching, since, then, the selvage including a coating layer on its back surface lb has once fused.
One may consider heating the separable fastener 1 by external heating, not by internal heating. External heating, howeverf has the drawbacks such as temperature ele-vation of fastening elements 12 alone that has large surface area and small heat capacity. On the other hand, the present invention employs internal heating, which realizes integral and comparatively uniform temperature elevation free from the above drawback.
, . ~
2 0 ~ 0 After the above press1ng and fusing steps, there may occur the following troubles.
The fastening elements 12 may, because of its small heat capacity, elevate its temperature to an extent unneces-sary or break upon.contact with press rolls 4 at an elevatedtemperature. Wavy-pattern projections or warping may generate in the flat parts 14 or wide separable fastener 1 (1A) itself due to variation in the conveying speed among a plurality of portions (that will, after slitting, become narrow separable fasteners.1B) containing rows of fas~ening elements and sandwiched by adjacent flat parts 14. This is because that the wide separable fastener 1 (1A) is under tension in the conveyin-g direction A, which is not always uniform in the widthwise direction B; and that, when the wide separable fastener 1 is heated and pressed bet~,e~.-n the press rolls 4 and horn 31, the flattened parts 14 of the substrate 11 will soften. Such wavy pattern or warping forms more readily, the longer the flat parts 14 being in a softened condition. This phenomena may hinder the formation of narrow separable fasteners 1B with selvages having neat appearance.
To solve the above problem, this embodiment of the present invention provides blow-out nozzles 5a that blow cool air C against the flat parts 14 just after contact of the press rolls 4 and the separable fastener 1. The cooling prevents the fastening elements 12 from being damaged by heat and also the flat parts 14 from genarating the above -~o-.. . . .
20~79~0 wavy pattern or warping upon continuous ~ormation of selvages 13.
While in the above embodiment the separable fastener 1 is pressed at the same time with internal heating, in the present invention the separable fastener may be pressed just after internal heating.
The process of the present invention is also applicable to male separable fasteners having hook-like or mushroom type fastening elements. For male separable fasteners having hook-like fastening elements comprising synthetic monofilament, in the present invention, the hook formation process can be combined with the above flat part-forming process and slitting process, whereby narrow separable (male) fasteners lB having selvages on both sides thereof can be continuously produced.
In the above continuous process, while the hook forma-tion process can be provided before the above flat part-forming process, it is preferably provided after the flat part-forming process. The superiority of the latter combination is because the uniformity of the pushing down directions of fastening elements differs depending cn the shape of the fastening elements and that loop-like fastening elements (precursor of hooks before cutting) are pushed down more uniformly by heat pressing than hook-like fastening elements (after cutting of loops), which have only one leg, so that the hoo]c formation after flat part-forming process can give selvages having more uniform appearance. The 20~7~90 . .
latter combination further has the advantage of assuring good smoothness of the flat parts. This is because that the fastening elements to be pushed clown and flattened by heat pressing are of loop shape and hence fuslon of onl~ part of each loop to the substrate 11 fixes the entire loop, laying flat, on the substrate surface. On the other hand, the above former combination must, in order to complete pushing down, fuse 2 pieces of monofllament projections remaining after cutting off of part of the side of a loop comprising a monofilament.
The hook formation process may be, after flat part-forming process, provided either before or after the slitting process, but it is preferable to provide it before slitting, which assures integral, compact provision of the loop-cutting device.
In the above hook formation process, loops comprising monofilament are, as the separable fastener is conveyed in the direction A, permitted to pass through needle-like sta-Z0 tionary knives provided in the widthwise direction B of theseparable fastener in a number corresponding to the number of the rows of the loops and in positions each contacting the point on one side of a loop to be cut, to form hooks.
In this embodiment, the above needle-like stationary knife is employed as cutting means for cutting loops comprising monofilament into hooks, because this system realizes high conveying speed, i.e. high productivity, utilizing the feature of the present invention capable of continuously 2087~90 forming a plurality of narrow separable fasteners hav.ing smooth selvages on both sides thereof. Other processes may, however, also be used, such as one using a hair clipper (see ~or example Japanese Patent Publication No. 13511/1967) and one comprising combination of a vibrating knife emitting ultrasonic fine vibration and a stationary knife (see for example Japanese Patent Publication No. 12603/1982).
- According to the present lnvention, separable fasteners with various sizes can be produced by changing the mounting pitch and/or roll width of the press rolls 4 shown in FIGURE
1.
It is needless to sa~, in the present invention, that the temperature of the separable fastener 1 should be maintained within a range that assures fusibility of the materials of the separable fastener and no melt down of the substrate l1 to rigid shape.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention ma~ be practiced otherwise than as specifically described herein.
Claims (3)
1. A process for forming selvages on the surface of a separable fastener comprising a substrate comprising a thermoplastic resin and, provided vertically on the surface thereof, a multiplicity of fastening elements comprising a thermoplastic resin, which comprises, while conveying said separable fastener in the longitudinal direction, internally heating said separable fastener along the conveying path and, at the same time, pressing said fastening elements onto said substrate to form flat parts that will constitute selvages, with a plurality of press rolls provided in a spaced relationship with each other in the widthwise direction of said separable fastener.
2. A process according to Claim 1, further comprising slitting, at the same time with or after the formation of said flat parts, the middle of said flat parts in the conveying direction, to obtain a plurality of narrow separable fastener with selvages formed on both sides thereof.
3. An apparatus for forming selvages on the surface of a separable fastener comprising a substrate comprising a thermoplastic resin and, provided vertically thereon, a multiplicity of fastening elements comprising a thermoplastic resin, which comprises:
a conveying device for conveying said separable fastener in the longitudinal direction, an internal heating device, provided near the conveying path of said separable fastener, for heating said separable fastener from its inside and along the conveying path, a support that contacts the back surface of said separable fastener heated and a press roll that contacts the surface of said separable fastener and presses said separable fastener between said support and fuses said fastening elements onto said substrate, to form on said separable fastener a flat part that will constitute selvages.
a conveying device for conveying said separable fastener in the longitudinal direction, an internal heating device, provided near the conveying path of said separable fastener, for heating said separable fastener from its inside and along the conveying path, a support that contacts the back surface of said separable fastener heated and a press roll that contacts the surface of said separable fastener and presses said separable fastener between said support and fuses said fastening elements onto said substrate, to form on said separable fastener a flat part that will constitute selvages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2087990 CA2087990A1 (en) | 1993-01-25 | 1993-01-25 | Process and apparatus for forming selvage of separable fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2087990 CA2087990A1 (en) | 1993-01-25 | 1993-01-25 | Process and apparatus for forming selvage of separable fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2087990A1 true CA2087990A1 (en) | 1994-07-26 |
Family
ID=4151036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2087990 Abandoned CA2087990A1 (en) | 1993-01-25 | 1993-01-25 | Process and apparatus for forming selvage of separable fastener |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2087990A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933927A (en) * | 1997-07-16 | 1999-08-10 | 3M Innovative Properties Company | Finger grip for a fastening system and a method of making the same |
| CN109623899A (en) * | 2018-12-27 | 2019-04-16 | 阜阳美源服饰有限公司 | A kind of cloth cutter device |
| CN109623900A (en) * | 2018-12-27 | 2019-04-16 | 阜阳美源服饰有限公司 | A kind of cloth Scissoring device and its method of cutting out |
| CN111501320A (en) * | 2020-04-23 | 2020-08-07 | 温州晨曦工艺品有限公司 | Non-woven fabric slitter capable of being accurately adjusted |
| CN111876991A (en) * | 2020-07-30 | 2020-11-03 | 任丘市庆信亨商贸有限公司 | Non-woven fabric slitting machine |
| CN112265031A (en) * | 2020-09-28 | 2021-01-26 | 安徽唯宝印刷科技有限公司 | Rubber washs cloth processing cutting device |
| CN112281466A (en) * | 2020-10-20 | 2021-01-29 | 王智飞 | Device is decided to textile material for textile printing and dyeing |
-
1993
- 1993-01-25 CA CA 2087990 patent/CA2087990A1/en not_active Abandoned
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933927A (en) * | 1997-07-16 | 1999-08-10 | 3M Innovative Properties Company | Finger grip for a fastening system and a method of making the same |
| CN109623899A (en) * | 2018-12-27 | 2019-04-16 | 阜阳美源服饰有限公司 | A kind of cloth cutter device |
| CN109623900A (en) * | 2018-12-27 | 2019-04-16 | 阜阳美源服饰有限公司 | A kind of cloth Scissoring device and its method of cutting out |
| CN111501320A (en) * | 2020-04-23 | 2020-08-07 | 温州晨曦工艺品有限公司 | Non-woven fabric slitter capable of being accurately adjusted |
| CN111876991A (en) * | 2020-07-30 | 2020-11-03 | 任丘市庆信亨商贸有限公司 | Non-woven fabric slitting machine |
| CN111876991B (en) * | 2020-07-30 | 2021-11-02 | 湖南仁瑞无纺制品有限公司 | Non-woven fabric slitting machine |
| CN112265031A (en) * | 2020-09-28 | 2021-01-26 | 安徽唯宝印刷科技有限公司 | Rubber washs cloth processing cutting device |
| CN112281466A (en) * | 2020-10-20 | 2021-01-29 | 王智飞 | Device is decided to textile material for textile printing and dyeing |
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