KR100626690B1 - Manufacture method of packing shrink film tube and manufacture apparatus of packing shrink film tube - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a shrink film tube for packaging and a method for manufacturing the same, and more particularly, to an apparatus for manufacturing a shrink film tube for packaging and a method of manufacturing the same, by forming a shrink film tube by extruding and then stretching a synthetic resin raw material. It is about.

That is, the present invention is a packaging shrink film tube manufacturing apparatus, the extrusion molding means for heating the thermoplastic resin material supplied to the hopper by extrusion molding into an integral diameter shrink film tube of the initial diameter; Stretching means for stretching the shrink film tube to have a final diameter in the process of heating and cooling the shrink film tube continuously supplied by the extrusion means; It includes, The stretching means relates to a packaging shrink film tube manufacturing apparatus, characterized in that for spraying steam (Steam) directly to the outer periphery of the shrink film tube passing through the inside.

Shrink Film Tube, Extrusion, Stretching, Steam, Stretch Tube, Heating, Cooling

Description

Manufacture method of packing shrink film tube and Manufacture apparatus of packing shrink film tube

1 is a perspective view showing a shrink film tube manufacturing apparatus for packaging according to an embodiment of the present invention.

Figure 2 is a side view showing the shrink film tube manufacturing apparatus for packaging.

Figure 3 is a side cross-sectional view of a stretch tube applied to the stretching means of the shrink film tube manufacturing apparatus for packaging.

Figure 4 is a flow chart showing a manufacturing process shrink film tube for packaging of the present invention.

<Description of Symbols for Major Parts of Drawings>

100: extrusion molding means 200: stretching means

220: extension tube 220a: steam injection unit

220b: cooling unit 222: cooling water inlet pipe

224: cooling water discharge pipe 226: steam inlet pipe

300: pressing means 400: winding means

The present invention relates to an apparatus for manufacturing a shrink film tube for packaging and a method for manufacturing the same, and more particularly, to an apparatus for manufacturing a shrink film tube for packaging and a method of manufacturing the same, by forming a shrink film tube by extruding and then stretching a synthetic resin raw material. It is about.

In general, the shrink film tube for packaging is formed through a process of cooling and curing after heating, and has a property of uniformly contracting inward direction when heat is applied while a specific article to be packaged is contained therein, and polyvinyl chloride (PVC: Poly Vinyl Chloride) is a trend that is manufactured using materials.

The above-mentioned PVC material was the material most used as a shrink film tube for packaging such as food and beverage labels because it is cheap and easy to mold until environmental regulations of PVC material are enforced in Korea.

However, PVC resin, which is the raw material of the shrink film tube, is the main culprit of environmental hormone and dioxin generation during the final processing during recycling, and thus is replaced with a substitute that is harmless to the human body in the situation where legislation is being regulated. Polyethylene terephthalate (PET) has been used.

Here, the above-described PET material has a low temperature shrinkage property, enables high-speed labeling, and has excellent chemical resistance. However, the specific gravity of the PET container and PET shrink film, which are mainly used as food and beverage containers, is the same, so that it is difficult to separate specific gravity. OPS: Oriented Polystyrene

Conventional packaging shrink film tube manufacturing apparatus is not shown in the drawings, but the extrusion molding for heating the raw material, such as PVC resin supplied by extrusion molding into a shrink film tube of the appropriate diameter, and the shrink film temporarily molded by the extrusion molding It consists of a stretch tube which softens a tube with hot air or hot water, cools it, and extends a shrink film tube at the time of cooling, and a winding part which winds up the shrink film tube stretched through the said stretch tube.

However, when the shrink film tube is stretched, the hot air sprayed to soften the shrink film tube not only causes a thickness deviation in the final molding of the shrink film tube, but also a process of stretching the initial shrink film tube formed of the thermoplastic resin. In the shrink film tube stuck to the inner circumference of the stretch tube, there was a problem that the defect occurs, thereby reducing the work yield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to shrink the packaging so that the softening of the shrink film tube can be performed by steam at an appropriate temperature in the process of stretching the shrink film tube to improve productivity. The present invention provides a film tube manufacturing apparatus and a method of manufacturing the same.

In order to achieve the above object, the present invention, a packaging shrink film tube manufacturing apparatus, the extrusion molding means for heating the thermoplastic resin material supplied to the hopper by extrusion molding into an integral diameter shrink film tube of the initial diameter; Stretching means for stretching the shrink film tube to have a final diameter in the process of heating and cooling the shrink film tube continuously supplied by the extrusion means; It includes, The stretching means, by spraying steam directly to the outer periphery of the shrink film tube passing through the inside, thereby softening the shrink film tube by the steam sprayed directly to the shrink film tube in the stretching means desirable.

In addition, the stretching means in the present invention, when the shrink film tube in the process of passing through the shrink film tube in the horizontal direction extending through the diameter corresponding to the final diameter when the tube is stretched; A steam injection unit is formed along the inner circumference of the distal end of the extension tube, and injects steam at a uniform pressure along the circumference of the shrink film tube so as to soften the shrink film tube proceeding into the stretch tube before stretching. ; A cooling unit which is formed inside the rear end of the stretching tube and circulates and discharges the cooling water introduced to cool and stretch the shrink film tube at an appropriate temperature; By including, the shrink film tube is softened by the steam injection portion provided in the stretch tube when passing through the inside of the stretch tube, and is cooled by the cooling unit, which is preferable because the stretching operation is easy.

In addition, the steam injection unit in the present invention, while having an appropriate depth and a suitable length along the inner periphery of the distal end of the stretch tube, the inner wall is recessed orthogonal to the circumferential surface and the rear end of the recessed portion is opened. It is preferable because steam is injected downward to a part which is partially sealed and opened by the tubular diaphragm.

Moreover, it is preferable that the steam direction injected from the said steam injection part in this invention has perpendicularity to the shrink film tube.

In addition, in the present invention, the tubular diaphragm partially sealing the steam injection unit is formed to protrude inwardly along the circumferential surface so as to form a step at the inner circumferential surface of the stretch tube, thereby guiding the steam to flow further toward the traveling direction of the shrink film tube. It is preferable because the surface temperature of the shrink film tube is maintained at the vapor temperature until the shrink film tube is drawn.

In addition, it is preferable that the temperature of the steam inject | poured by the said steam injection part in this invention is 100-150 degreeC.

Moreover, since the said cooling part in this invention is hollow formed in the longitudinal direction along the circumferential surface inside the rear end of the said extending | stretching tube, since cooling water circulates in the hollow formed space, it is preferable.

In addition, since the inner diameter of the stretched tube in the present invention is increased or decreased according to the molding diameter of the shrink film tube, the stretch diameter of the shrink film tube to be finally formed can be adjusted.

In addition, the shrink film tube in the present invention is preferably molded from OPS (Oriented Polystyrene) resin.

Hereinafter, the present invention will be described with reference to the accompanying drawings, the shrink film tube manufacturing apparatus and a manufacturing method of the present invention with reference to the accompanying drawings.

The shrink film tube manufacturing apparatus for packaging according to an embodiment of the present invention, as shown in Figures 1 and 2, the extrusion means 100, the stretching means 200, the pressing means 300, the winding means Is made of 400, the installation position of the shrink film tube manufacturing apparatus for packaging is provided with the extrusion means 100 at the rear end, the stretching means 200 is provided in front of the extrusion means 100, The pressing means 300 is provided in front of the stretching means 200, and the winding means 400 is provided in front of the pressing means 300 to form an in-line shape.

The extrusion means 100 is a function of heating the thermoplastic resin material supplied therein to extrusion molding into a temporary shrinkage film tube (T) of the appropriate diameter, the components of the base 102, the body 104 ), A heater 106, a nozzle 108, and a hopper 110.

The base 102 functions to fix the position so that it is located at a suitable height from the ground to be installed.

The body 104 is provided on the upper surface of the base 102, the inner portion is formed in the horizontal direction through the screw through the crushing role and stirring role by the drive motor (not shown in the drawing) in the penetrated interior (Screw: Not shown) is provided.

The heater 106 is provided to surround the front end of the body 104 and melts the raw material by providing heat to the front end of the body 104 by an externally applied power source.

The nozzle 108 is fixed to the front surface of the body 104 is formed through the diameter corresponding to the diameter of the shrink film tube (T) that is temporarily molded. Here, the nozzle 108 is replaceable according to the increase or decrease in the diameter of the temporary shrink film tube (T).

The hopper 110 has a funnel shape that is fixed to the rear surface of the rear end of the body 104 and used to replenish the extruded means 100 with the thermoplastic resin raw material in powder form.

On the other hand, the shrink film tube (T) is a polyvinyl chloride (PVC: Poly Vinyl Chloride) resin, polyethylene terephthalate (PET: polyethylene terephthalate) resin and stretched polystyrene (OPS: Oriented Polystyrene) resin can be molded.

The stretching means 200 is the final shrink film tube (T) stretched by stretching the shrink film tube (T) in the process of heating and cooling the shrink film tube (T) continuously supplied by the extrusion molding means (100). ), And the components thereof include a base 202, a side plate 204, upper and lower rollers 206 and 208, a driving unit 210, a water tank 212, and a drawing tube 220. ), A cooling water inlet tube 222, a cooling water discharge tube 224, and a steam inlet tube 226.

The base 202 functions to fix the position so that it is located at an appropriate height on the ground to be installed.

The side plate 204 is interposed so that the upper and lower rollers 206, 208 can be rotated while the pair of uprights on one side of the base 202 is spaced apart by an appropriate distance and the upper and lower rollers 206, 208 are supported therebetween. .

The upper and lower rollers 206 and 208 are rotated at an appropriate speed and spaced apart by an appropriate distance, but are discharged while the shrink film tube T passing therebetween is press-fitted, and the upper roller 206 is a lower roller ( From 208 it is possible to move the position by a predetermined height.

The driving unit 210 is connected and fixed on the shaft of the upper roller 206 and is driven by an applied power source, so that the lower roller 208 is also opposite to the driving direction of the upper roller 206 by the driving unit 210. Drive it.

The water tank 212 is fixed to the upper surface of the base 202, which is the lower side of the extension tube 220, is provided so as to contain the liquid that the vapor injected from the extension tube 220 is liquefied and falls.

The drawing tube 220 is a cylindrical shape extending in the longitudinal direction as shown in Figure 3 has a suitable depth and the appropriate length on the inner peripheral edge of the tip, the inner wall is formed with a groove orthogonal to the circumferential surface of the groove Partly sealed by the tubular diaphragm 228 so that the rear end is opened, and the steam injection portion 220a and the longitudinal direction along the circumferential surface inside the rear end of the extension pipe 220 in which steam is injected downward to the opened portion. It consists of a cooling unit 220b is formed hollow. In addition, the stretch tube 220 is formed to penetrate through the diameter corresponding to the final diameter when the shrink film tube T is drawn in the course of passing the shrink film tube T having an initial diameter therein, The inner diameter of the fuse 220 may be increased or decreased depending on the final diameter of the shrink film tube (T).

That is, the steam injection unit 220a is formed along the inner circumference of the distal end of the extension tube 220, so as to soften the shrink film tube T extending into the extension tube 220 before extension. Steam is injected directly into the shrink film tube T at a uniform pressure along the circumference of the shrink film tube T.

And the rear surface of the groove formed at the inner periphery of the distal end of the extension tube 220 is formed in a state orthogonal to the inner peripheral surface of the extension tube 220, the injection direction of the steam flowing through the steam inlet tube 226 is shrink film tube It should be perpendicular to the surface of (T).

In addition, the cooling unit 220b is hollow formed along the circumference between the outer periphery and the inner periphery of the rear end of the extension tube 220 and communicates with the cooling water inlet tube 222 and the cooling water discharge tube so as to communicate with the hollow formed cooling unit 220b. 224 is provided to communicate with each other in the upper and lower sides of the extension tube 220, the cooling water is introduced through the cooling water inlet tube 222 and circulated to circulate the cooling film tube (T) at an appropriate temperature to circulate the cooling water discharge tube (224) To be discharged.

In addition, a ring smaller than an inner diameter of the extension pipe 220 may be disposed at the inner circumferential edge of the extension pipe 220 so that the vapor injected through the steam inlet pipe 226 may be sprayed further toward the rear than the front in the extension pipe 220. The diaphragm 228 of the shape is fixed to the groove formed on the inner circumference of the tip is provided along the circumferential surface so that the tubular diaphragm 228 partially sealing the steam injection section 220a is formed in the inner peripheral surface of the stretch tube 220 It is formed to further protrude so as to guide the flow of steam further toward the traveling direction of the shrink film tube (T).

That is, since the stretching of the shrink film tube (T) is made in the rear side of the inside of the stretch tube (220) so that the spray direction of the steam to the rear to uniformly soften until the stretching portion of the shrink film tube (T). . Here, it is preferable that the temperature of the vapor | steam injected is 100-150 degreeC.

At least one coolant inlet tube 222 and a coolant discharge tube 224 are provided at upper and lower ends of the outer circumferential edge of the extension tube 220 to communicate with the cooling unit 220b. Cooling water is introduced and discharged to allow cooling and stretching. Here, a pump (not shown) may be provided in the cooling water inlet pipe 222 and the cooling water discharge pipe 224. On the other hand, it is preferable that the temperature of the cooling water which cools the said shrink film tube T is 30 degrees C or less.

The steam inlet pipe 226 is provided at least one outer periphery of the distal end of the extension tube 220, so that the ductility can be given to the shrink film tube (T) that enters and moves inside the extension tube (220). Steam is injected into the shrink film tube T at a specific location. The steam inlet pipe 226 is in communication with a steam generator (not shown) to provide steam to the steam inlet pipe 226 from the outside.

Here, the vapor that sprays the shrink film tube (T) to soften the shrink film tube (T) before the federation is vaporized by a part of a substance in a liquid state. It refers to a gaseous phase of a substance that begins to break and is produced under a constant pressure, but is a nickname for gas, but does not refer to gas at room temperature and atmospheric pressure, such as argon or hydrogen, and has a low boiling point and is relatively liquefied.

The pressing means 300 has a function of pressing up and down to facilitate the winding of the shrink film tube (T) stretched through the stretching means 200, as shown in Figures 1 and 2, as a component The base consists of the base 302, the side plate 304, the upper and lower rollers 306 and 308, the driving unit 310, and the auxiliary roller 312.

The base 302 functions to fix the position so that it is located at an appropriate height on the ground to be installed.

The side plate 304 is interposed so that the upper and lower rollers (306, 308) is rotatable while the pair of uprights on one side of the base (302) is spaced apart by an appropriate distance and the upper and lower rollers (306, 308) are supported therebetween. .

The upper and lower rollers 306 and 308 are rotated at an appropriate speed and provided to be spaced apart by an appropriate distance, and the shrink film tube T passing therebetween is discharged in a compressed state, and the upper roller 306 is the lower roller 308. It is possible to move the position by a predetermined height.

The driving unit 310 is connected and fixed on the shaft of the upper roller 306 and driven by an applied power source, so that the lower roller 308 is also opposite to the driving direction of the upper roller 306 by the driving unit 310. Drive it.

The auxiliary roller 312 is fixed to the upper surface of the base 302, which is the rear of the upper and lower rollers 306 and 308, to direct the movement direction of the compressed shrink film tube T to the winding means 400.

 The winding means 400 has a function of finally winding the shrink film tube T passed through the crimping means 300, and the components include a base 402, a driving part 404, and a rotating plate 406. )

The base 402 serves to fix the position so that it is located at an appropriate height on the ground to be installed.

The drive unit 404 is driven by an applied power source and is fixed to the center of the bottom surface of the base 402 and provided with a drive shaft protruding upward.

The rotating plate 406 has a center fixed to the drive shaft of the drive unit 404 and is formed with a step so that the shrink film tube T is wound on the step.

Therefore, the operation of the packaging shrink film tube manufacturing apparatus of the present invention is filled with the raw material of the shrink film tube (T) in the hopper 110 of the extrusion means 100, as shown in Figure 1 to Figure 3 In the process of stirring the raw material by the screw provided therein, the raw material is melted by the heat source of the heater 106 provided on the outer periphery of the body 104 and the nozzle is provided on the front surface of the body 104 ( 108, the shrink film tube T is extruded to have an initial diameter.

Thereafter, the stretching film 200 proceeds to the stretching means 200 in order to stretch the shrink film tube T, and the shrink film tube T passing between the upper and lower rollers 206 and 208 is stretched in a pressurized state. ) Passes through the inside, and at this time, the shrink film tube (T) passing through the inner peripheral surface of the distal end of the extension tube 220 is the steam flow into the steam inlet tube 226 provided in the extension tube 220 The soft water is sprayed directly onto the shrink film tube T through the sander 220a, and the softened shrink film tube T is cooled by the cooling water inlet tube 222 communicating at the rear end of the stretch tube 220. The cooling film introduced into and introduced into the cooling water circulates through the rear end of the drawing tube 220 to be discharged to the cooling water discharge tube 224. Stretching is achieved.

And the stretched shrink film tube (T) is squeezed up and down while passing between the upper and lower rollers (306, 308) of the crimping means 300, and in contact with the outer periphery of the auxiliary roller (312) rotating plate 406 of the winding means (400) ) Is wound to facilitate packaging by the drive of the drive unit 404.

The shrink film tube manufacturing method of the present invention is composed of an extrusion molding step (S500) and the stretching step (S510), the pressing step (S520) and the winding step (S530) as shown in FIG.

The extrusion molding step (S500) is filled with the thermoplastic resin raw material in the hopper 110 of the extrusion molding means 100 and then melted by the heater 106 provided at the front end of the body 104 before the stretching Extruding the shrink film tube (T) to have a suitable diameter.

The stretching step (S510) is a predetermined number of shrink film tube (T) for proceeding the steam of the appropriate temperature in the process of passing the shrink film tube (T) to be extruded through the stretching tube 220 of the stretching means (200) When the circumferential surface is sprayed with steam of uniform pressure, the shrink film tube T is given flexibility by steam while having a uniform temperature, and then cooled to an appropriate temperature to cool the shrink film tube T. Stretching is a step.

Here, the stretching tube 220 of the stretching means 200 is the stretching diameter when the shrink film tube T is stretched in the process of passing the shrink film tube T formed to have an initial diameter therein and It is formed through the corresponding diameter, the inner diameter of the stretch tube 220 can be increased or decreased according to the final diameter of the shrink film tube (T).

Here, the vapor injected directly to the shrink film tube (T) so as to soften the shrink film tube (T) so that the spray direction is perpendicular to the surface of the shrink film tube (T), the shrink film tube ( The vapor direction injected to T) is further flowed toward the direction in which the shrink film tube T flows, thereby maintaining the internal temperature of the stretch tube 220 at an appropriate temperature and uniformly softening the stretched portion of the shrink film tube T until the stretched portion. . Here, it is preferable that the temperature of the vapor | steam injected is 100-150 degreeC.

On the other hand, the vapor that is sprayed to soften the shrink film tube (T) before stretching the shrink film tube (T) is a part of the material in the liquid state is vaporized (氣化) when the liquid is heated It refers to a gaseous phase of a substance that begins to break and occurs under a constant pressure, but is a nickname for gas, but does not refer to a gas at room temperature and atmospheric pressure, such as argon or hydrogen, and has a low boiling point and is relatively liquefied.

The pressing step (S520) is a step of compressing up and down so that the contracted film tube (T) stretched through the stretching step (S510) is wound while being passed through the upper and lower rollers (306, 308) for easy packing.

The winding step (S530) is a step of winding the shrink film tube (T) vertically compressed through the pressing step (S520) for easy storage and packaging, the shrink film on the rotating plate 406 by the driving force of the drive unit 404. The tube T is wound up.

Here, the extrusion molding means (100), the stretching means (200), the pressing means (300) for performing the extrusion molding step (S500) and the stretching step (S510) and the pressing step (S520) and the winding step (S530). And, each of the winding means 400 has the same structure and function as that of the preceding shrink film tube manufacturing apparatus for packaging, detailed description thereof will be omitted.

Such a shrink film tube manufacturing apparatus and a manufacturing method of the present invention is provided in the in-line form of the extrusion molding means, the stretching means, the pressing means and the winding means is a shrink film tube in the process of passing the stretching film tube through the stretching means. Is stretched, but the outer periphery of the shrink film tube is sprayed with steam at an appropriate temperature so that the shrink film tube does not adhere to the inner periphery of the stretch tube and softens the shrink film tube to a uniform temperature and then cools to an appropriate temperature. Since the diameter of the shrink film tube is enlarged at the site and is stretched through the process of winding the shrink film tube by rotating at a suitable speed by the winding means, there is an effect of improving productivity as there is no thickness variation of the shrink film tube.

In addition, the stretching of the shrink film tube is not limited to the OPS resin, there is an effect that can be applied to both PVC resin and PET resin.

Claims (17)

In the shrink film tube manufacturing apparatus for packaging, Extrusion molding means for heating the thermoplastic resin material supplied to the hopper and extruding it into an integral diameter shrink film tube of an initial diameter; Stretching means for stretching the shrink film tube to have a final diameter in a process of heating and cooling the shrink film tube continuously supplied by the extrusion means; Including; The stretching means is a shrink film tube manufacturing apparatus for packaging, characterized in that for spraying steam (Steam) directly to the outer periphery of the shrink film tube passing through the inside. The method of claim 1, wherein the stretching means, A stretch tube in a horizontal direction formed through the shrink film tube when the shrink film tube is stretched in the course of passing through the inside thereof to a diameter corresponding to a final diameter; The steam injection unit is formed along the inner circumference of the distal end of the extension tube and injects steam at a uniform pressure along the circumference of the shrink film tube so as to soften before shrinking the shrink film tube proceeding to the inside of the extension tube. ; A cooling unit formed in the rear end of the stretching tube and having a cooling water circulated so as to cool and stretch the shrink film tube at an appropriate temperature; Shrink film tube manufacturing apparatus for packaging that comprises a. The method of claim 2, wherein the steam injection unit, The inner wall is formed to be recessed orthogonal to the circumferential surface along the inner circumference of the distal end of the stretch tube and partially closed by the tubular diaphragm so that the rear end of the recess is opened. Steam is injected into the shrink film tube, Steam is injected into the steam injection unit space is filled and the packed steam is characterized in that the continuous continuous injection so as to be directed toward the circumference of the shrink film tube from the one side of the opening of the steam injection unit, the packaging film for packaging . The method of claim 3, wherein The packaging direction of the shrink film tube packaging device, characterized in that the steam direction is injected from the steam injection portion has a perpendicular to the shrink film tube. The method of claim 4, wherein The tubular diaphragm which partially seals the steam injection part is formed to protrude inwardly along the circumferential surface so as to form a step at the inner circumferential surface of the stretch tube to guide the flow of steam further toward the traveling direction of the shrink film tube. Tube manufacturing equipment. The method of claim 5, The temperature of the steam injected from the steam injection unit is 100 ~ 150 ℃ packaging shrink film tube manufacturing apparatus, characterized in that. The method of claim 6, The inner diameter of the stretch tube is wrapped shrink film tube manufacturing apparatus, characterized in that the increase and decrease according to the final diameter of the shrink film tube. The method of claim 7, wherein the cooling unit, Wrapping film tube manufacturing apparatus, characterized in that the hollow formed in the longitudinal direction along the circumferential surface in the rear end of the extension tube. The method of claim 8, The shrink film tube manufacturing apparatus for packaging, characterized in that the temperature of the cooling water circulated in the cooling unit is 30 ℃ or less. The method of claim 9, wherein the shrink film tube, Shrink film tube manufacturing apparatus for packaging, characterized in that the molded by OPS (Oriented Polystyrene) resin. In the method of manufacturing a shrink film tube for packaging, 1) an extrusion molding step of heating the thermoplastic resin raw material and extruding the shrink film tube by extrusion molding means to have a proper diameter; 2) In the process of passing the shrink film tube to be extruded through the inside of the draw tube of the stretching means, steam is injected directly to the outer periphery of the shrink film tube to impart ductility, and then cooled to an appropriate temperature to draw. Stretching step; Method for producing a shrink film tube for packaging, characterized in that consisting of. The method of claim 11, Method for producing a shrink film tube for packaging, characterized in that for spraying a predetermined circumferential surface of the shrink film tube to be carried out during the step 2) with a vapor of a uniform pressure. The method of claim 12, The method of manufacturing a shrink film tube for packaging, characterized in that the direction of the vapor injected into the shrink film tube when performing step 2) has a perpendicularity to the shrink film tube. The method of claim 13, The method of manufacturing a shrink film tube for packaging, characterized in that the spray direction is injected to the flow direction of the shrink film tube in the direction of the shrink film tube when performing step 2). The method of claim 14, Method for producing a shrink film tube for packaging, characterized in that the temperature of the steam injected into the shrink film tube in step 2) is 100 ~ 150 ℃. The method of claim 15, The temperature of the cooling water for cooling the shrink film tube in the step 2) is less than 30 ℃ packaging method for producing a shrink film tube. The method of claim 16, wherein the shrink film tube, Method for producing a shrink film tube for packaging, characterized in that it is molded from OPS (Oriented Polystyrene) resin.

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