US20060054270A1 - Method and apparatus for connecting resin films - Google Patents

Method and apparatus for connecting resin films Download PDF

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Publication number
US20060054270A1
US20060054270A1 US10/516,289 US51628904A US2006054270A1 US 20060054270 A1 US20060054270 A1 US 20060054270A1 US 51628904 A US51628904 A US 51628904A US 2006054270 A1 US2006054270 A1 US 2006054270A1
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United States
Prior art keywords
resin film
film
leading
trailing
resin
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
Application number
US10/516,289
Inventor
Satoshi Takahashi
Takuji Nakamura
Katsumori Nomura
Tsutomu Akitomo
Kazuki Hosoda
Kunihiro Yoshimura
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Toyo Kohan Co Ltd
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Individual
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Assigned to TOYO KOHAN CO., LTD. reassignment TOYO KOHAN CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKITOMO, TSUTOMU, HOSODA, KAZUKI, NAKAMURA, TAKUJI, NOMURA, KATSUNORI, TAKAHASHI, SATOSHI, YOSHIMURA, KUNIHIRO
Publication of US20060054270A1 publication Critical patent/US20060054270A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1857—Support arrangement of web rolls
    • B65H19/1873—Support arrangement of web rolls with two stationary roll supports carrying alternately the replacement and the expiring roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
    • B65H19/181—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll
    • B65H19/1815—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll the replacement web being stationary prior to splicing contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1842—Attaching, e.g. pasting, the replacement web to the expiring web standing splicing, i.e. the expiring web being stationary during splicing contact
    • B65H19/1852—Attaching, e.g. pasting, the replacement web to the expiring web standing splicing, i.e. the expiring web being stationary during splicing contact taking place at a distance from the replacement roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1857—Support arrangement of web rolls
    • B65H19/1868—The roll support being of the turret type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73117—Tg, i.e. glass transition temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/462—Form of splice
    • B65H2301/4621—Overlapping article or web portions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/463—Splicing splicing means, i.e. means by which a web end is bound to another web end
    • B65H2301/4634—Heat seal splice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/464—Splicing effecting splice
    • B65H2301/46412—Splicing effecting splice by element moving in a direction perpendicular to the running direction of the web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/175—Plastic
    • B65H2701/1752—Polymer film

Definitions

  • the present invention relates to a method and an apparatus for connecting long bell-shaped resin films that are continuously advanced.
  • the films are continuously manufactured in a long bell-shaped form, split to an appropriate width, then wound into a coil-like shape of an appropriate length, and shipped to subsequent processing.
  • the long bell-shaped resin films wound into coils are processed for various applications, but in the course of this processing, the long bell-shaped resin films wound into coils are consumed, while the processing is advanced as the films are continuously unwound. In order to prevent the interruption of the processing, immediately before the coil of the resin film is unwound and completely consumed, it has to be connected to the next coil of the resin film.
  • FIGS. 6 to 8 The connection of the leading resin film and trailing resin film is conducted as shown in FIGS. 6 to 8 .
  • a leading resin film 11 that was wound into the coil-like shape on unwinding means 1 such as an uncoiler is continuously unwound and transported to processing (not shown in the figure) in the rightward direction, as shown in the figure.
  • the unwinding means 1 moves (in the figure, rotates through 180°) and unwinding means 2 having a trailing resin film 22 wound thereon into a coil-like shape is positioned in the position where the unwinding means 1 was located (as shown in the figure, the unwinding means 1 and unwinding means 2 have mutual arrangement with rotational symmetry and exchange positions by rotation through 180°), as shown in FIG. 7 .
  • the leading resin film 11 is transported to the connection position via a touch roll 6 provided selectively in order to enhance smooth transportation by applying an appropriate tension to the film.
  • film pressure bonding means 3 such as a press roll is moved into the connection position (pushed up as shown in the figure), the leading resin film 11 is brought into contact with an adhesive material (not shown in the figure) such as a two-side tape that was pasted in advance onto the tip end on the outermost periphery of the trailing resin film 22 that was wound into a coil-like shape, and press bonded with the film pressure bonding means 3 .
  • film cutting means 4 such as a film cutter is moved, brought into contact with the leading resin film 11 and cuts the film. Connection of the leading resin film 11 and trailing resin film 22 is thus conducted.
  • connection could not be conducted with the above-described connection method.
  • Most of the long bell-shaped resin films are the so-called oriented films which are oriented by stretching uniaxially in the lengthwise direction or biaxially in the lengthwise and widthwise directions.
  • oriented films because the film is rigid, when a film cutter, which is film cutting means, is brought into contact with the film, after one point of the cutter touches the film, the cutter contacts the film over the entire film width, a cutting surface along a straight line is formed and cutting is completed. If the film is thus cut, the tip end of the trailing resin film is connected without a hindrance to the leading resin film and the film is smoothly transported to the processing stage.
  • connection method and connection apparatus that enable connection operation, while continuously executing the processing operation of the subsequent process, in connecting a leading resin film and a trailing resin film which are long bell-shaped non-oriented resin films that are continuously advanced.
  • the method for connecting resin films in accordance with the invention is a connection method comprising the steps of cutting a long bell-shaped leading resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bonding, wherein the leading resin film is heated immediately prior to cutting, the aforementioned leading resin film is a non-oriented film, and the heating is conducted to a temperature equal to or higher than the glass transition temperature and less than the melting temperature of the leading resin film.
  • the apparatus for connecting resin films in accordance with the invention comprises unwinding means for a leading resin film, unwinding means for a trailing resin film, heating means for the leading resin film, pressure bonding means for the leading resin film and trailing resin film, and cutting means for the leading resin film.
  • connection method comprising the steps of cutting a long bell-shaped non-oriented leading resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bond ing, heating the leading resin film immediately prior to cutting allows cutting to be conducted with the formation of a cutting surface along a straight line, without rupturing the non-oriented film into pieces during film cutting. Therefore, the processing operation of the next stage can be executed continuously and stably, without the film cuttings adhering to the resin films that were joined and being carried over to the subsequent processing stage.
  • FIG. 1 is a schematic view illustrating one stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 2 is a schematic view illustrating another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 3 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 4 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 5 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 6 is a schematic view illustrating one stage of the conventional method for connecting a leading resin film and a trailing resin film.
  • FIG. 7 is a schematic view illustrating another stage of the conventional method for connecting a leading resin film and a trailing resin film.
  • FIG. 8 is a schematic view illustrating another stage of the conventional method for connecting a leading resin film and a trailing resin film.
  • FIGS. 1 to 5 illustrate the connection method and an embodiment of the apparatus for connecting resin films in accordance with the invention.
  • the connection apparatus 10 for resin films in accordance with the invention is composed of unwinding means 1 such as an uncoiler onto which a leading resin film 11 is wound into a coil-like shape, unwinding means 2 such as an uncoiler onto which a trailing resin film 22 is wound into a coil-like shape, film press bonding means 3 such as a press roll, film cutting means 4 such as a film cutter, film heating means 5 such as a heater, and a touch roll 6 which is selectively provided.
  • unwinding means 1 such as an uncoiler onto which a leading resin film 11 is wound into a coil-like shape
  • unwinding means 2 such as an uncoiler onto which a trailing resin film 22 is wound into a coil-like shape
  • film press bonding means 3 such as a press roll
  • film cutting means 4 such as a film cutter
  • film heating means 5 such as a heater
  • a touch roll 6 which is selectively provided.
  • the unwinding means 1 and unwinding means 2 have mutual arrangement with rotational symmetry and are configured so that they exchange positions by rotation through 180°.
  • the leading resin film 11 wound on the unwinding means 1 to have a coil-like shape is continuously unwound and transported to processing (not shown in the figure) in the rightward direction, as shown in the figure. If the coil of the leading resin film 11 is consumed and a small amount thereof remains, as shown in FIG. 2 , the unwinding means moves by rotation through 180° and the unwinding means 2 having the trailing resin film 22 wound thereon in the coil-like shape is positioned in the position where the unwinding means 1 was located.
  • the leading resin film 11 is transported to the connection position via a touch roll 6 provided selectively in order to enhance smooth transportation by applying an appropriate tension to the film.
  • film pressure bonding means 3 such as a press roll is moved in the connection position (pushed up as shown in the figure), the leading resin film 11 is brought into contact with an adhesive material (not shown in the figure) such as two-side tape that was pasted in advance onto the tip end on the outermost periphery of the trailing resin film 22 that was wound into a coil-like shape, and press bonded with the film pressure bonding means 3 .
  • the film heating means 5 such as a heater is moved and brought into contact with the leading resin film 11 to heat the film. If a non-oriented film is heated to a temperature equal to or higher than the glass transition temperature And less than the melting temperature of the resin film, preferably, to a temperature range of from glass transition temperature to glass transition temperature +20° C., then the resin film can be provided with ductility similar to that of the oriented film. However, if heating is not conducted over a length within a predetermined range in the lengthwise direction of the resin film, then cutting along a straight line, as in cutting of the oriented films, cannot be conducted.
  • the non-oriented film is cut by using an electrically heated wire with a diameter of 0.6 mm, it is ruptured to pieces.
  • the heating range in the lengthwise direction is too long, then the film shrinks or wrinkles appear therein.
  • the length of the heating range is set by taking into account the thickness of the resin films and transportation speed of the resin films, so as to obtain the above-described preferred temperature range as the film heating means 5 is brought into contact with the leading resin film 11 .
  • the pressure by which the film heating means 5 is brought into contact with the leading resin film 11 also has to be set to a preferred range together with the aforementioned conditions.
  • the film cutting means be disposed as close as possible in order to reduce the decrease in temperature to a minimum.
  • connection apparatus for resin films in accordance with the invention can be also used, without actuating the film heating means, as a connection apparatus for oriented resin films.
  • a leading resin film and a trailing resin film composed of the below-described long bell-shaped three-layer non-oriented polyester resin film were connected by using the apparatus shown in FIGS. 1 to 5 under the conditions shown in Table 1.
  • Upper layer transparent polyester layer with a thickness of 2 ⁇ m.
  • Intermediate layer white polyester layer with a thickness of 9 ⁇ m comprising 27 wt. % white pigment.
  • Lower layer white polyester layer with a thickness of 2 ⁇ m comprising 5 wt. % white pigment.
  • connection method comprising the steps of cutting a leading resin film composed of a long bell-shaped non-oriented resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bonding, when the leading resin film was heated immediately prior to cutting, the non-oriented film was cut with the formation of the cutting surface along a straight line, without being ruptured to pieces, the ruptured film cuttings were prevented from adhering to the resin films that were joined and being carried over to the subsequent processing stage, and the processing operation of the next stage could be executed continuously with good stability.

Abstract

A connection method and connection apparatus for connecting long belt-shaped non-oriented resin films that are continuously advanced. A leading resin film and a trailing resin film can be connected while processing in a following step is continuously performed. The tip end of a trailing resin film (22) is joined and connected to a leading resin film {11), and then a portion, immediately after the connected position, of the leading resin film is heated to a predetermined temperature range and cut.

Description

    TECHNICAL FIELD
  • The present invention relates to a method and an apparatus for connecting long bell-shaped resin films that are continuously advanced.
    • BACKGROUND ART
  • In the manufacturing process of most of the resin films used as various tapes and packaging materials, the films are continuously manufactured in a long bell-shaped form, split to an appropriate width, then wound into a coil-like shape of an appropriate length, and shipped to subsequent processing. The long bell-shaped resin films wound into coils are processed for various applications, but in the course of this processing, the long bell-shaped resin films wound into coils are consumed, while the processing is advanced as the films are continuously unwound. In order to prevent the interruption of the processing, immediately before the coil of the resin film is unwound and completely consumed, it has to be connected to the next coil of the resin film.
  • The connection of the leading resin film and trailing resin film is conducted as shown in FIGS. 6 to 8. Thus, as shown in FIG. 6, a leading resin film 11 that was wound into the coil-like shape on unwinding means 1 such as an uncoiler is continuously unwound and transported to processing (not shown in the figure) in the rightward direction, as shown in the figure. If the coil of the leading resin film 11 is consumed and a small amount thereof remains, the unwinding means 1 moves (in the figure, rotates through 180°) and unwinding means 2 having a trailing resin film 22 wound thereon into a coil-like shape is positioned in the position where the unwinding means 1 was located (as shown in the figure, the unwinding means 1 and unwinding means 2 have mutual arrangement with rotational symmetry and exchange positions by rotation through 180°), as shown in FIG. 7. The leading resin film 11 is transported to the connection position via a touch roll 6 provided selectively in order to enhance smooth transportation by applying an appropriate tension to the film.
  • Then, as shown in FIG. 8, film pressure bonding means 3 such as a press roll is moved into the connection position (pushed up as shown in the figure), the leading resin film 11 is brought into contact with an adhesive material (not shown in the figure) such as a two-side tape that was pasted in advance onto the tip end on the outermost periphery of the trailing resin film 22 that was wound into a coil-like shape, and press bonded with the film pressure bonding means 3. Immediately thereafter, film cutting means 4 such as a film cutter is moved, brought into contact with the leading resin film 11 and cuts the film. Connection of the leading resin film 11 and trailing resin film 22 is thus conducted.
  • However, it was found that for certain resin films the connection could not be conducted with the above-described connection method. Most of the long bell-shaped resin films are the so-called oriented films which are oriented by stretching uniaxially in the lengthwise direction or biaxially in the lengthwise and widthwise directions. In the case of an oriented film, because the film is rigid, when a film cutter, which is film cutting means, is brought into contact with the film, after one point of the cutter touches the film, the cutter contacts the film over the entire film width, a cutting surface along a straight line is formed and cutting is completed. If the film is thus cut, the tip end of the trailing resin film is connected without a hindrance to the leading resin film and the film is smoothly transported to the processing stage.
  • On the other hand, in the case of the so-called non-oriented films that were not oriented, because the film is not rigid, when the trailing resin film is connected to the leading resin film in the above-described manner, if the film cutter, which is film cutting means, is brought into contact with one point of the film, it immediately ruptures the film into pieces and film cuttings are formed. The film cuttings adhere to the resin films that were joined and are carried over to the subsequent processing stage, thereby making it impossible to execute the processing operation of the next stage with good stability.
  • It is an object of the present invention to provide a connection method and connection apparatus that enable connection operation, while continuously executing the processing operation of the subsequent process, in connecting a leading resin film and a trailing resin film which are long bell-shaped non-oriented resin films that are continuously advanced.
    • DISCLOSURE OF THE INVENTION
  • The method for connecting resin films in accordance with the invention is a connection method comprising the steps of cutting a long bell-shaped leading resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bonding, wherein the leading resin film is heated immediately prior to cutting, the aforementioned leading resin film is a non-oriented film, and the heating is conducted to a temperature equal to or higher than the glass transition temperature and less than the melting temperature of the leading resin film.
  • The apparatus for connecting resin films in accordance with the invention comprises unwinding means for a leading resin film, unwinding means for a trailing resin film, heating means for the leading resin film, pressure bonding means for the leading resin film and trailing resin film, and cutting means for the leading resin film.
  • In accordance with the invention, in a connection method comprising the steps of cutting a long bell-shaped non-oriented leading resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bond ing, heating the leading resin film immediately prior to cutting allows cutting to be conducted with the formation of a cutting surface along a straight line, without rupturing the non-oriented film into pieces during film cutting. Therefore, the processing operation of the next stage can be executed continuously and stably, without the film cuttings adhering to the resin films that were joined and being carried over to the subsequent processing stage.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic view illustrating one stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 2 is a schematic view illustrating another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 3 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 4 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 5 is a schematic view illustrating yet another stage of the method in accordance with the invention for connecting a leading resin film and a trailing resin film.
  • FIG. 6 is a schematic view illustrating one stage of the conventional method for connecting a leading resin film and a trailing resin film.
  • FIG. 7 is a schematic view illustrating another stage of the conventional method for connecting a leading resin film and a trailing resin film.
  • FIG. 8 is a schematic view illustrating another stage of the conventional method for connecting a leading resin film and a trailing resin film.
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • An embodiment of the invention will be described below in greater detail with reference to the appended drawings.
  • FIGS. 1 to 5 illustrate the connection method and an embodiment of the apparatus for connecting resin films in accordance with the invention.
  • The connection apparatus 10 for resin films in accordance with the invention is composed of unwinding means 1 such as an uncoiler onto which a leading resin film 11 is wound into a coil-like shape, unwinding means 2 such as an uncoiler onto which a trailing resin film 22 is wound into a coil-like shape, film press bonding means 3 such as a press roll, film cutting means 4 such as a film cutter, film heating means 5 such as a heater, and a touch roll 6 which is selectively provided.
  • The unwinding means 1 and unwinding means 2 have mutual arrangement with rotational symmetry and are configured so that they exchange positions by rotation through 180°. As shown in FIG. 1, the leading resin film 11 wound on the unwinding means 1 to have a coil-like shape is continuously unwound and transported to processing (not shown in the figure) in the rightward direction, as shown in the figure. If the coil of the leading resin film 11 is consumed and a small amount thereof remains, as shown in FIG. 2, the unwinding means moves by rotation through 180° and the unwinding means 2 having the trailing resin film 22 wound thereon in the coil-like shape is positioned in the position where the unwinding means 1 was located. The leading resin film 11 is transported to the connection position via a touch roll 6 provided selectively in order to enhance smooth transportation by applying an appropriate tension to the film.
  • Then, as shown in FIG. 3, film pressure bonding means 3 such as a press roll is moved in the connection position (pushed up as shown in the figure), the leading resin film 11 is brought into contact with an adhesive material (not shown in the figure) such as two-side tape that was pasted in advance onto the tip end on the outermost periphery of the trailing resin film 22 that was wound into a coil-like shape, and press bonded with the film pressure bonding means 3.
  • Then, as shown in FIG. 4, just before the connection position, the film heating means 5 such as a heater is moved and brought into contact with the leading resin film 11 to heat the film. If a non-oriented film is heated to a temperature equal to or higher than the glass transition temperature And less than the melting temperature of the resin film, preferably, to a temperature range of from glass transition temperature to glass transition temperature +20° C., then the resin film can be provided with ductility similar to that of the oriented film. However, if heating is not conducted over a length within a predetermined range in the lengthwise direction of the resin film, then cutting along a straight line, as in cutting of the oriented films, cannot be conducted. For example, even if the non-oriented film is cut by using an electrically heated wire with a diameter of 0.6 mm, it is ruptured to pieces. On the other hand, if the heating range in the lengthwise direction is too long, then the film shrinks or wrinkles appear therein. The length of the heating range is set by taking into account the thickness of the resin films and transportation speed of the resin films, so as to obtain the above-described preferred temperature range as the film heating means 5 is brought into contact with the leading resin film 11. Further, the pressure by which the film heating means 5 is brought into contact with the leading resin film 11 also has to be set to a preferred range together with the aforementioned conditions. Moreover, it is preferred that the film cutting means be disposed as close as possible in order to reduce the decrease in temperature to a minimum.
  • Then, as shown in FIG. 5, the film cutting means 4 such as a film cutter is brought into contact with the heated portion of the leading resin film 11 which was heated within the predetermined range in the lengthwise direction and the film is cut. The connection of the leading resin film 11 and trailing resin film 22 is thus conducted. The connection apparatus for resin films in accordance with the invention can be also used, without actuating the film heating means, as a connection apparatus for oriented resin films.
    • Embodiments
  • A leading resin film and a trailing resin film composed of the below-described long bell-shaped three-layer non-oriented polyester resin film were connected by using the apparatus shown in FIGS. 1 to 5 under the conditions shown in Table 1.
  • [Three-Layer Non-Oriented Polyester Resin Film]
  • Upper layer: transparent polyester layer with a thickness of 2 μm.
  • Intermediate layer: white polyester layer with a thickness of 9 μm comprising 27 wt. % white pigment.
  • Lower layer: white polyester layer with a thickness of 2 μm comprising 5 wt. % white pigment.
    TABLE 1
    Test conditions and results thereof
    Test conditions for leading resin film
    Film feed Film Length of Heating Time to cutting
    Test rate tension heated temp. after heating State of film
    No. (m/min) (N) portion (mm) (° C.) (msec) after cutting Section
    1 160 70 100 95 70 Good Present invention
    2 160 90 100 95 70 Good Present invention
    3 160 50 100 95 70 Partial rupture Comparative example
    4 160 50 100 100 70 Good Present-invention
    5 160 70 100 110 70 Good Present invention
    6 160 70 100 100 70 Good Present invention
    7 160 70 100 110 200 Rupture Comparative example
    8 160 50 Film is not heated Rupture Conventional example
  • As shown in Table 1, when the non-oriented resin film is heated to the adequate temperature range, the cut surface is formed along a straight line, without rupturing the film to pieces, similarly to cutting of non-oriented films. Therefore, film cuttings do not adhere to the joined resin films.
    • INDUSTRIAL APPLICABILITY
  • In accordance with the invention, in the connection method comprising the steps of cutting a leading resin film composed of a long bell-shaped non-oriented resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bonding, when the leading resin film was heated immediately prior to cutting, the non-oriented film was cut with the formation of the cutting surface along a straight line, without being ruptured to pieces, the ruptured film cuttings were prevented from adhering to the resin films that were joined and being carried over to the subsequent processing stage, and the processing operation of the next stage could be executed continuously with good stability.

Claims (4)

1. A method for connecting resin films, comprising the steps of cutting a long bell-shaped leading resin film that is continuously advanced, placing the tip end of a long bell-shaped trailing resin film on the cut end, and connecting by pressure bonding, wherein the leading resin film is heated immediately prior to cutting.
2. The method for connecting resin films according to claim 1, wherein said leading resin film is a non-oriented film.
3. The method for connecting resin films according to claim 1, wherein the heating is conducted to a temperature equal to or higher than the glass transition temperature and less than the melting temperature of the leading resin film.
4. An apparatus for connecting resin films comprising unwinding means for a leading resin film, unwinding means for a trailing resin film, heating means for the leading resin film, pressure bonding means for the leading resin film and trailing resin film, and cutting means for the leading resin film.
US10/516,289 2002-06-20 2003-06-17 Method and apparatus for connecting resin films Abandoned US20060054270A1 (en)

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JP2002-180118 2002-06-20
JP2002180118A JP3965329B2 (en) 2002-06-20 2002-06-20 Resin film connecting method and connecting device
PCT/JP2003/007654 WO2004000534A1 (en) 2002-06-20 2003-06-17 Method and apparatus for connecting resin films

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JP5011204B2 (en) * 2008-05-16 2012-08-29 日東電工株式会社 Sheet member joining method and sheet joined body
CN101913509B (en) * 2010-07-29 2011-11-30 哈尔滨博实自动化股份有限公司 Method for automatically replacing M-shaped cylindrical film roll
EP3798341B1 (en) * 2019-09-26 2022-08-24 KARL MAYER STOLL R&D GmbH Thread connecting device and warp knitting machine comprising a thread connecting device
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DE60325474D1 (en) 2009-02-05
ATE418438T1 (en) 2009-01-15
JP3965329B2 (en) 2007-08-29
EP1514671A4 (en) 2007-06-06
JP2004017622A (en) 2004-01-22
KR20050014009A (en) 2005-02-05
ES2315506T3 (en) 2009-04-01
CN1662360A (en) 2005-08-31
EP1514671A1 (en) 2005-03-16
KR100639090B1 (en) 2006-10-30
WO2004000534A1 (en) 2003-12-31
CN1332804C (en) 2007-08-22
EP1514671B1 (en) 2008-12-24

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