WO2009135341A1

WO2009135341A1 - A method of making a shrinkable plastic film by environment-friendly resin materials

Info

Publication number: WO2009135341A1
Application number: PCT/CN2008/001094
Authority: WO
Inventors: 杨启赞
Original assignee: Yang Chi-Tsan
Priority date: 2008-05-04
Filing date: 2008-06-04
Publication date: 2009-11-12
Also published as: CN101570060A; CN101570060B

Abstract

A method of making a shrinkable plastic film by environment-friendly resin materials is molding the environment-friendly resin material OPS, PET or PLA to a tubular plastic film by a blow-moulding apparatus and collapsing it to a flattened plastic film by rolls. Then the first step, forcibly cooling, is done to get stronger toughness of said flattened plastic film; the second step, heating, is whereby the film is soft; the third step, said flattened plastic film passes an orienting equipment which avoids ununiformity of film because of torsion and wave of the film in the heated water, at the same time, extrudes the redundant materials induced by ununiformity to flattened portions in the both sides of flattened plastic film which is through an orienting equipment, in order to providing filmuniformity of blown tubular plastic film; the forth step, rapid-cooling, is whereby the molded tubular plastic film has improved toughness and shrinkage. After being wound onto a reel, the film can be cut by the users at the two sides flattened portions on the surface and formed two sheets of plastic films with uniform thickness. When it is used to printing and covering container, the film has improved heat-shrinkable properties and has nontoxic and environment-friendly effect.

Description

Method for producing shrinkable plastic film by using environmentally friendly resin material

The invention is a method for manufacturing a plastic film by using an environmentally-friendly resin material, that is, a method for forming a shrink plastic film by using an environmentally-friendly resin material such as OPS, PET or PLA. Background technique

The general shrinkage plastic film is formed into a tubular plastic film by a blow molding machine using a PVC (polyvinyl chloride) material, and then directly wound up; the plastic film made of the PVC material itself has toughness, 遂The shrink film made of this material has been used for many years, and its use range includes covering the outer surface of the container after surface printing, and wrapping it around the container by heat shrinking as a product advertisement and labeling effect.

Since the aforementioned PVC materials are gradually banned, various environmentally friendly resin materials such as OPS (p-octylphenyl salicylate), PET (polyethylene terephthalate), PLA (C) have been developed. A lactide polyester, commonly known as polylactic acid, is used as a shrinking plastic film instead of the PVC material. Due to the non-toxic properties of the OPS and PET in the environmentally friendly resin material, and the PLA is naturally decomposed and non-toxic, Therefore, it will not cause secondary pollution and will be a key development industry advocated by the government. Summary of the invention

First, the problem solved:

Since the plastic film is blown into a plough using a PVC material, the PVC material itself cannot be decomposed, and secondary pollution will occur, which is very harmful to the environment. Therefore, the PVC material is gradually being eliminated.

When the PVC material is heated and melted in the air blow molding machine, it emits toxic gas, which will cause pollution of the human body and the environment.

However, if an environmentally-friendly resin material such as OPS, PET, or PLA is used, and a tubular plastic film is formed by using a blow molding machine, the toughness of the stretched property will be insufficient, and the formed tubular plastic film will be transported by winding. Stretching, even being torn, results in a high rate of failure.

The aforementioned environmentally-friendly resin material is excellent in stretchability, and the thickness of the formed plastic film is not uniform due to the stretching of the molding process, and even causes cracking.

Second, the means of solution:

1. The present invention is an environmentally friendly resin material such as OPS, PET, PLA (these materials are all commercially available products),

1 PC0806017TW After forming a tubular plastic film by a blow molding machine, rolling and forming a folded plastic film, the forced cooling of the first step causes the folded plastic film to have strong toughness, and then enters the second step. Heating and softening, the folded plastic film is subjected to the positioning device of the third step to avoid the unevenness of the thickness of the film wall caused by the torsion flutter generated in the traveling hot water, and the excess unevenness material is squeezed to the positioning position. The folded plastic film is creased on both sides of the device to provide an average thickness of the tubular plastic film wall after blowing, and then enters the fourth step of rapid cooling, and the formed tubular plastic film is formed by means of a rapid cooling die tube. The toughness is improved and the shrinkage rate is increased, and the tubular plastic film is rolled along the previous two side creases through a roller to form a folded plastic film, which is wound up at the end, after being wound up. To provide users. The user only needs to cut the crease portions on both sides of the surface to form two plastic films of uniform thickness for printing and coating the container, thereby improving the heat shrinkage quality and having non-toxic environmental protection effects.

2. The cooling device of the first step of the present invention may be water-cooled or air-cooled, and the temperature of the blow-molded plastic film may be controlled to be less than 20 ° C, so that the folded plastic film is After the cooling device is cooled and shaped, the toughness is improved.

3. The second step of the present invention is carried out by heating and softening, and is carried out in a hot water container or a heating box of about 70 to 85 ° C to cause the folded plastic film to be softened by heating.

4. The positioning device of the third step of the present invention is provided with corresponding positioning plates respectively on the upper sides of the transmission roller, and the positioning roller groups corresponding to the arrays may be continuously arranged above the two positioning plates, or two corresponding corresponding groups. The positioning sleeve formed by the semi-circular stiffening plate allows the folded plastic film to enter a passage between each other against the positioning plate, and the folded plastic film is blown to regenerate the tubular plastic film by blowing, by virtue of the positioning The holding force of the plate, so that the thickness of the film wall of the plastic film of the two halves is squeezed to the crease position on both sides when expanding, so that the thickness of the film wall is averaged, and then the array of rollers or the array is positioned through the array. The positioning of the positioning sleeve is such as to provide the expanded tubular plastic film to avoid torsional fluttering during travel to prevent thickness unevenness between the walls of the membrane due to pushing of the material.

5. The rapid cooling device of the fourth step of the present invention is to reposition the tubular plastic film after positioning into a rapid cooling mold tube (cooling temperature is below 15 ° C) to reshape the tubular plastic film of the uniform film wall thickness. To enhance the toughness and thermal shrinkage of the tubular plastic film.

Compared with the prior art, the present invention has the following beneficial effects:

1. The above-mentioned rapid cooling mold tube of the present invention, wherein a hollow cooling water flow path is provided in the pipe wall, and the cooling water flow passage is provided with an inlet pipe and an outlet pipe, and the water temperature is preferably 15 ° C or less.

2. The blow molding die of the present invention, wherein the outer edge of the core is made of an environmentally friendly resin material at a suitable angle from the bottom end.

2 PC0806017T The material enters the starting point of the hole and presents a spiral groove upward. The environmentally-friendly resin material is pushed into the inlet hole of the mold core through the air blowing machine, and is uniformly stirred through the spiral groove of the mold core, and then between the mold core and the die. The tubular plastic film is slit and expanded by the air blowing hole in the center of the core to form a uniform wall thickness to improve the uniformity of the film wall.

3. The present invention is located between the first step of forced cooling and the second step of heating and softening, and a relay roller set is provided to convey the folded plastic film via the relay roller set to reduce the folding of the transfer roller The tensile force of the plastic film prevents the folded plastic film from being stretched to reduce its shrinkage. DRAWINGS

1 is a block diagram showing the manufacturing process of the present invention;

2 is a schematic view showing a manufacturing process of a first embodiment of the present invention;

Figure 2-A is a structural view and a partial cross-sectional view of a molding die of the present invention;

Figure 2-B is a sectional view showing the structure of the molding die of the present invention;

Figure 2-C is a schematic view showing the appearance of a molding die assembly of the present invention;

3 is a schematic view showing a manufacturing process of a second embodiment of the present invention;

Figure 3-A is a cross-sectional view showing the vertical state of the positioning device of Figure 3 of the present invention;

Figure 4 is a diagram showing the state of the tubular plastic film passing through the rapid cooling die in the third step of the present invention;

Figure 4-A is a perspective sectional view showing the rapid cooling mold tube of the present invention;

Figure 4-B is a cross-sectional view of the rapid cooling mold tube of the present invention;

FIG. 5 is a schematic side elevational view of the positioning device of the present invention.

DESCRIPTION OF REFERENCE NUMERALS: environmentally friendly resin material 1; blow molding machine A; tubular plastic film 2; folded plastic film 2; film wall 21; crease 22; two-sided plastic film 20, 20'; first step forced cooling 3 Second step 骒 heating softening 4; third step positioning device 5; transfer roller 51; pass it 520; positioning plate 52, 52'; positioning roller set 53; semi-circular stiffening plate 54, 54'; positioning sleeve 55; Four-step rapid cooling 6; rapid cooling mold 61; hollow cooling water flow path 611; inlet water pipe 612; water outlet pipe 613; winding 7; forming die A1; mold core Al l; inlet hole A12; spiral groove A13; A14; heater A2; relay roller set 8, Β'; motor Μ. Detailed ways

In order to further understand the technical content of the present invention, it will be described in detail later by way of example:

Please refer to Figure 1, Figure 2, Figure 3, Figure 3-Α, which is based on OPS, PET, PLA and other environmentally friendly resins.

3 PC0806017TW Material 1, after forming a tubular plastic film 2 by a blow molding machine A, and then rolling to form a folded plastic film 2, and forced cooling down by the first step 3, so that the folded plastic film 2 is produced. Strong toughness, and then entering the second step of heating softening 4, the folded plastic film 2, through the positioning device 5 of the third step, to avoid the torsional flutter generated in the traveling hot water, causing uneven thickness of the film wall 21 Phenomenon, at the same time, the excess uneven thickness material is extruded to the folded plastic film 2 of the positioning device 5, and the folds 22 are located on both sides to provide an average thickness of the film wall 21 of the blown tubular plastic film 2, and then Into the rapid cooling 6 of the fourth step, the formed tubular plastic film 2 is made to be more tough by the rapid cooling mold tube 61 (as shown in Fig. 3-A), and the shrinkage rate thereof is increased. To provide the user to cut only the two sides of the crease 22 on the surface to form two plastic films of uniform thickness for printing and coating the container, improve the heat shrinkage quality, and have non-toxic environmental protection effect .

Referring to FIG. 2 and FIG. 3, the folded plastic film 2, the cooling device 3 in the first step may be water-cooled or air-cooled, and the temperature thereof may be controlled according to the thickness of the blow-molded plastic film 2 Preferably, the folded plastic film 2 is cooled and shaped by the forced cooling device 3 to improve the toughness.

Referring to FIG. 1 to FIG. 4, a second step of heating and softening 4 is constituted by a hot water container or a heating box provided with a temperature of about 70 to 85 ° C, so that the folded plastic film 2 enters the The heating device described above softens.

Referring to FIG. 1 to FIG. 3, FIG. 5 and FIG. 3-A, the third step positioning device 5 is provided with corresponding positioning plates 52, 52' respectively on the upper sides of the transmission roller 51, and the two The positioning plates 52, 52 can be connected with a positioning roller group 53 corresponding to the complex array, or a positioning sleeve 55 formed by the corresponding semicircular righting plates 54, 54 (Fig. 3-A). The folded plastic film 2 enters the channel 520 between the positioning plates 52, 52, and expands the folded plastic film 2 by blowing, and returns to the tubular plastic film 2, by means of the positioning plate 52, 52, the holding force (as shown in Fig. 5), and the material of the thickness of the film wall 21 of the plastic film 20, 20' (Fig. 5) of the two halves is squeezed to the position of the two side folds 22 when expanded, so that The film wall 21 has an average thickness, and is further positioned by the plurality of positioning roller sets 53 or the positioning sleeve 55 to provide the expanded tubular plastic film 2 to avoid twisting and wandering during the movement to prevent the film. Thickness unevenness occurs between the walls 21 due to the pushing of the material.

Please refer to FIG. 1 to FIG. 4; the fourth step of the rapid cooling device 6 is to press the positioned tubular plastic film 2 into a rapid cooling mold 61, so that the thickness of the average film wall 21 is tubular. The plastic film is again shaped to enhance the toughness and heat shrinkage of the tubular plastic film.

Referring to FIG. 2, FIG. 3, FIG. 4 and FIG. 4-A, B, the rapid cooling mold tube 61 is provided with a hollow cooling water flow path 611 in the pipe wall, and the cooling water flow path 611 is provided with Water pipe 612 and outlet pipe

4 PC0806017TW 613, preferably having a water temperature of 15 ° C or less, and flowing in the hollow cooling water flow path 611 by the water inlet pipe 612 and the water outlet pipe 613.

Referring to FIG. 2, FIG. 3 and FIG. 2-A to FIG. 2-C, in the molding die A1 of the first and second embodiments, the outer edge of the die core All is from the bottom end at each appropriate angle. The environmentally-friendly resin material 1 enters the starting point of the hole A12, and is turned upside down by the spiral groove A13, and the environmentally-friendly resin material 1 is pushed into the inlet hole A12 of the mold core Al1 through the blow molding machine A, and passes through the molding die. The heating of the heater A2 in the head A1 causes the environmentally-friendly resin material 1 to travel between the spiral grooves A13 of the mold core Al1 to be heated on the one hand, and uniformly stirred on the one hand, and then between the mold core Al1 and the die A1. The slit A14 is formed into a tubular plastic film 2 to form a tubular rubber mold 2 of a film wall 21 of uniform thickness, which is increased in shrinkage.

Referring to FIG. 2 and FIG. 3, the first step of the forced cooling 3 and the second step of heating and softening 4 are performed, and a relay roller set Β' is set to make the folded plastic film 2 pass through the motor. The driving relay roller group Β, Β, is rotated and conveyed to reduce the pulling force of the conveying roller 51 on the folded plastic film 2, to avoid folding the plastic film 2, and being stretched to reduce the shrinkage rate.

The above description is to be construed as illustrative, and not restrictive, However, it will fall within the scope of protection of the present invention.

PC0806017TW

Claims

Rights request

A method of producing a shrinkable plastic film using an environmentally friendly resin material, characterized in that the method comprises the following steps:

a. Apply OPS, PET, PLA and other environmentally friendly resin materials, form them into a tubular plastic film by a blow molding machine, and then roll to form a folded plastic film;

b. entering the first step of forced cooling, so that the folded plastic film produces strong toughness; c. then enter the second step of heating softening, making it easy to blow air expansion;

d. The folded plastic film is subjected to the positioning device of the third step to avoid the unevenness of the thickness of the film wall caused by the torsion flutter generated in the traveling hot water, and the excess uneven thickness material is squeezed to the positioning device. Folding the plastic film on both sides of the crease position to make the film thickness of the blown tubular plastic film uniform; e. Then proceed to the fourth step of rapid cooling, the formed tubular plastic film by means of a rapid cooling die tube Better toughness and increase its shrinkage;

f. further pressing the tubular plastic film along the previous two side creases through a roller to form a folded plastic film, and winding it at the end;

Therefore, the rolled plastic film can provide the user to cut only the crease portions on both sides to form two plastic films of uniform thickness, which can be used for printing and coating containers to enhance Heat shrinkage and quality, and non-toxic environmental effects.

2. The method according to claim 1, wherein the cooling device of the first step is water-cooled or air-cooled, and the temperature is blown according to the blowing. The thickness of the gas-formed plastic film can be controlled below 20 °C.

A method of producing a shrinkable plastic film using an environmentally friendly resin material according to claim 1, wherein said second step is heated and softened, and is provided with a hot water container or a heating tank ' of about 70 85 °C.

4. A method for producing a shrink plastic film by applying an environmentally-friendly resin material according to claim 1, wherein the third step positioning device is provided with corresponding positioning plates on both sides of the upper side of the transport roller. An array of corresponding positioning roller groups may be continuously disposed above the two positioning plates, so that the folded plastic film enters a channel between the positioning plates, and the folded plastic film is retracted by the air blowing. In the case of a plastic film, by means of the holding of the positioning plate, the material of the film thickness of the plastic film of the two halves is unevenly squeezed to the crease position on both sides during expansion, so that the thickness of the film wall is averaged and passed. The array positioning roller group is limited to prevent the torsion fluttering between the expanded tubular plastic film to prevent thickness unevenness between the film walls due to pushing of materials.

The method for producing a shrinkable plastic film using an environmentally friendly resin material according to claim 1, wherein

6 PC0806017TW The third step positioning device is provided with corresponding positioning plates on both sides of the upper side of the transmission roller, and the positioning sleeve formed by the corresponding semi-circular righting plate can also be connected above the two positioning plates. Passing the folded plastic film into a passage between each other against the positioning plate, and when the folded plastic film is blown to regenerate the tubular plastic film by blowing, the plastic film of the two sides is made by the holding of the positioning plate The material with uneven thickness of the membrane wall is squeezed to the crease position on both sides when expanding, so that the thickness of the membrane wall is averaged, and then the limit of the positioning sleeve is passed to provide the expanded tubular plastic. The film travels to avoid twisting and fluttering to prevent thickness unevenness due to material pushing between the film walls.

6 . The method according to claim 1 , wherein the fourth step is rapid cooling, wherein a rapid cooling mold tube is arranged above the positioning device, and the tube wall thereof There is a hollow cooling water flow channel, and the cooling water flow channel is provided with an inlet pipe and an outlet pipe, and the water temperature is preferably 15 'C or less, and the inlet pipe and the outlet pipe flow in the hollow cooling ice channel. Make in and out of the water flow path.

7 . The method of claim 1 , wherein the outer periphery of the core of the molding die is from the bottom end to the hole of the environment-friendly resin material at each appropriate angle. 7 . Starting point, a spiral groove is formed upwardly, and the environmentally-friendly resin material is pushed into the inlet hole of the mold core through a blow molding machine, and is stirred by the spiral groove of the mold core, and then the mold core is The slit between the die is a tubular plastic film, and is blown by the blow hole in the center of the die to form a tubular plastic film having a film wall of uniform thickness to improve the uniformity of the film wall.

A method for producing a shrinkable plastic film by applying an environmentally-friendly resin material according to claim 1, wherein between the first step of forced cooling and the second step of heating and softening, a relay roller set is provided to The folded plastic film is conveyed by rolling of the motor-driven relay roller set to reduce the pulling force of the transfer roller on the folded plastic film, and the folded plastic film is prevented from being stretched to reduce the shrinkage rate.

7 PC0806017TW