JP3793967B2 - Shrink insulation film for containers and packaging - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shrinkable heat insulating film for container packaging having heat insulation properties for covering and packaging containers such as plastic bottles, bottles and cans used as containers for soft drinks, taste drinks, foods, seasonings and the like. It is.
[0002]
[Prior art]
Soft drinks, taste drinks, foods, seasonings, etc. are sold in plastic bottles, bottles, cans, or paper containers such as plastic bottles. Of these containers, plastic bottles, bottles, cans, etc. When it is necessary to attach a label to the container, in recent years, it is often coated and packaged with a label using a lateral uniaxial shrink film made of expanded polystyrene (OPS) or polyester (PET).
[0003]
The shrink film for container packaging made of OPS or PET is usually a transparent thermoplastic transverse uniaxial heat shrinkable film of about 45 to 60 μm, and it is necessary to apply backside printing to the thermoplastic transverse uniaxial shrinkable film. After slitting to the width dimension of the slit film, one end of the slit shrink film in the width direction is overlapped with the other dimension in the width direction and center-sealed with a solvent, adhesive, ultrasonic wave, etc. to produce a tube shape The tube-shaped shrink film that has been bagged and cut to the required length is placed, for example, on the outer periphery of the barrel over a plastic bottle or bottle to be labeled, and in this state, it passes through the shrink tunnel. By heating under the required shrinkage treatment conditions, the shrink film is shrunk in the lateral direction, and is brought into close contact with the outer periphery of the body of a plastic bottle or bottle, whereby the printing is performed. Some shrink film, it is constituted such that it is mounted on the plastic bottle or bottle as a label.
[0004]
When a can is used as a container, printing may be performed directly on the can. On the other hand, after printing on a shrink film made of PET, a label is attached to the can by attaching it to the can.
[0005]
By the way, various beverages and foodstuffs packed in containers such as plastic bottles, bottles and cans may be sold in a heated state using a hot warmer or the like. In this case, the OPS having a thickness of about 45 to 60 μm. Since heat-insulating performance is lacking in the shrink film made of PET or PET, when the beverage packed in the container on which the label made of the shrink film is attached is heated to 55 to 60 ° C., the heat of the contents is transferred to the container wall and Since it is directly transmitted to the outside through the label, there is a problem that the container cannot be held in its hand due to its heat. For this reason, a shrink film having heat insulation has been proposed.
[0006]
As a lateral uniaxial shrink film for container packaging having such heat insulation performance, a film made of foamed PP or a film obtained by bonding shrink PET to a shrink foamed PP with a skin layer has been proposed (for example, Patent Documents). 1).
[0007]
However, the foamed PP lateral uniaxial shrinkable film and the skinned shrinkable foamed PP have a markedly reduced shrinkage performance compared to OPS and PET shrinkable films. After making into a tube shape of dimensions, cut into the required dimensions, place it on the container and place it on the outer periphery of the barrel, and in this state, pass through the shrinking tunnel and place the above-mentioned foamed PP horizontal uniaxial on the barrel of the container If the shrink film is to be brought into close contact, the processing conditions in the shrink tunnel must be changed drastically. Therefore, the shrink tunnel conventionally provided in filling equipment such as plastic bottles and cans is replaced with a new heat shrink condition. There is a problem that it is necessary to change to equipment, and huge capital is required for capital investment. In particular, when a plastic bottle is used as a container to be mounted, if the shrinkage treatment temperature is increased to increase the degree of shrinkage of the expanded PP horizontal uniaxial shrink film, the plastic bottle itself may be deformed before the label shrinks. There is also a problem.
[0008]
Therefore, in order to reduce the cost, a highly shrinkable label is desired. Furthermore, there is a need for a label suitable for a labeling machine that is used to label an existing lateral uniaxial shrink OPS or PET film on a predetermined container.
[0009]
In order to provide a label that meets such demands, the present applicant has already proposed a method for producing a horizontal uniaxial high-shrinkage film. As shown in FIG. 3 (a), the film obtained by this method is obtained by placing a nonwoven fabric 2 on a transversely uniaxial thermoplastic shrinkable film sheet 1 having high shrinkage performance, and the main flow direction of the fibers 2a of the nonwoven fabric 2. It is a shrink film A for packaging containers that is stacked so as to be in a direction (hereinafter, indicated by arrow Y in the figure) perpendicular to the main shrinkage direction (hereinafter indicated by arrow X in the figure) of the film sheet 1.
[0010]
[Patent Document 1]
Japanese Patent No. 2893286
[0011]
[Problems to be solved by the invention]
However, according to the shrinkable film A for container packaging obtained by the manufacturing method proposed by the applicant, the shrinkage performance in the lateral uniaxial direction can be enhanced, which is extremely useful. Is a film having a structure in which a nonwoven fabric 2 is superimposed on a thermoplastic shrink film sheet 1 so that the main flow direction of the fibers 2a of the nonwoven fabric 2 is perpendicular to the main shrink direction of the film sheet 1. In addition, as a result of repeated efforts and research, generally, when a heat quantity that sufficiently shrinks in the main shrinkage direction is given to the horizontal uniaxial thermoplastic shrink film sheet 1 having high shrinkage, the direction orthogonal to the main shrinkage direction However, the nonwoven fabric 2 contracts in the same manner following the thermal contraction of the thermoplastic shrinkable film sheet 1 in the main flow direction of the fibers 2a. Therefore, when this is heat-shrinked on the outer periphery of the packaging target container 3 as a label, the thermoplastic transverse uniaxial shrinkable film sheet 1 that shrinks in the vertical direction on the outer surface side of the label, and the inner surface side of the label It has been found that there is a difference in shrinkage property between the nonwoven fabric 2 that cannot shrink in the vertical direction.
[0012]
Due to the difference in the shrinkage physical properties, for example, after the bag is formed into a tube shape with the nonwoven fabric 2 inside, the bag is placed on the outer periphery of the trunk portion over the container 3 to be packaged, and in this state, it passes through the shrink tunnel and is required When shrinking by heating under the heat shrinkage treatment conditions, the top and bottom curls of the so-called top curl 4 and bottom curl 5 in which the upper and lower ends of the label rise from the surface of the container 3 as shown in FIG. It was found to cause the phenomenon. In particular, when the generated top curl 4 is located on the shoulder of the container 3 to be packaged, there is a concern that moisture accumulates in the top curl 4 portion, which may cause sanitary problems. For this reason, the further improvement for making it possible to eliminate the generation | occurrence | production of the said curl phenomenon is desired.
[0013]
Therefore, as a technique for preventing the occurrence of the top curl 4 and the bottom curl 5 as described above, it is conceivable to weaken the shrinking conditions and make the shrinkage state of the thermoplastic shrinkable film sheet 1 incomplete. In this case, when the container 3 to be packaged has a screw-type lid 3a, when the lid 3a is turned to open, the label 3 and the container 3 may slip and the lid 3a may not be opened. This may cause a problem that it is difficult to open. Therefore, it was also considered to apply an adhesive such as hot melt on the inside of the nonwoven fabric 2 of the label. In this case, the adhesive is absorbed by the nonwoven fabric 2 when the amount of adhesive applied is small. On the other hand, if the application amount of the adhesive is greatly increased in order to prevent this absorption, the adhesive such as the hot melt applied on the inside causes blocking when the bag is formed into a tube shape, and the mouth ( It has been found that it is not preferable because the end opening) becomes difficult to open, the slip between the label and the packaging target container 3 becomes poor, and the problem of lack of processing suitability arises.
[0014]
Therefore, as a result of repeated efforts and research to prevent the occurrence of the curling phenomenon due to heat treatment at the time of label mounting, the present inventors have developed a thermoplastic shrinkable film sheet used as a material. If the shrinkage rate in the direction orthogonal to the main shrinkage direction under the predetermined heat shrinkage condition that is applied at the time of label mounting is 4% or less, the difference in shrinkage property with the nonwoven fabric that does not shrink in the main flow direction of the fiber is kept small. It was found that the curl phenomenon would not occur and the present invention was made.
[0015]
Therefore, the object of the present invention is for container packaging that has high shrinkability and can be attached to a container without causing a curl phenomenon even during heat treatment for attachment to the container to be packaged. It is intended to provide a shrink insulation film.
[0016]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a heat having shrinkage properties in which a shrinkage rate in a direction orthogonal to the main shrinkage direction is 4% or less under predetermined heat shrinkage treatment conditions that are applied when the container is mounted. On one side of the plastic uniaxial shrink film sheet, It cannot be shrunk in the main flow direction of the fiber and is made to follow by narrowing the distance between the fibers in the direction perpendicular to the main flow direction of the fiber. The nonwoven fabric is laminated and integrated so that the main flow direction of the fibers of the nonwoven fabric is perpendicular to the main shrink direction of the thermoplastic uniaxial shrink film sheet.
[0017]
After both ends of the thermoplastic uniaxially shrinkable film sheet in the main shrinking direction are sealed with the nonwoven fabric inside to form a tube, the tube is placed on the outer periphery of the container to be packaged. Given the predetermined heat shrinkage treatment conditions for mounting on the thermoplastic uniaxially shrinkable film sheet, the thermoplastic uniaxially shrinkable film sheet is shrunk at a high shrinkage rate at the same time as the non-woven fabric. Since it is made to follow by narrowing the space | interval of fibers in the direction orthogonal to the main flow direction of a fiber, the shrinkage | contraction based on the shrinkage | contraction physical property of the said thermoplastic shrinkable film sheet is performed, and it is made to contact | adhere to the outer periphery of a container. At this time, with respect to the direction orthogonal to the main shrinkage direction of the thermoplastic shrinkable film sheet, the shrinkage rate of the thermoplastic shrinkable film sheet is limited to 4% or less. The thermoplastic shrinkable film sheet is not greatly shrunk on the outer peripheral side, so that the occurrence of a top curl or bottom curl phenomenon is prevented.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 (a) (b) and FIG. 2 (b) (b) show one embodiment of the shrinkable heat insulating film for container wrapping of the present invention. When a heat treatment is applied for 10 seconds in warm water at 95 ° C. corresponding to the heat treatment conditions in a shrink tunnel using steam, for example, the shrinkage rate in the horizontal direction (arrow X direction in the figure) is 60% or more. In addition, the shrinkage property in the vertical direction (arrow Y direction in the figure) is 4% or less, preferably, the shrinkage property is such that the horizontal direction shrinkage rate is 65% or more and the vertical direction shrinkage rate is 3.0% or less. The horizontal uniaxial type thermoplastic shrinkable film sheet 1a is in a state where printing is not performed, or a state in which a required pattern is printed in advance by a printing machine such as a gravure printing machine as necessary, and the thermoplastic shrinkage One side of film sheet 1a On the printing surface) when the printing are performed, the adhesive 6 and a thickness in the wet state, for example, 5 to 10 g / m in dry terms so as to be more thick from about 5μm ² When the adhesive 6 is wet, the basis weight is 10 to 30 g / m. ² The nonwoven fabric 2 is arranged so that the main flow direction of the fibers 2a of the nonwoven fabric 2 is along the direction perpendicular to the main shrinkage direction of the thermoplastic shrinkable film sheet 1a, that is, the arrow Y direction in FIG. Laminate on the adhesive coated surface. Here, the wet adhesive 6 refers to the layer of the adhesive 6 when the fibers 2a of the nonwoven fabric 2 are pressed against the coated surface of the adhesive 6 with a required pressure to bond the nonwoven fabric 2 together. It refers to the adhesive 6 in a state having a property that can be embedded and buried. Therefore, the adhesive 6 may be somewhat dried as long as the fibers 2a of the nonwoven fabric 2 can be buried by being pressed at the required pressure. Thereafter, the adhesive 6 is completely dried in a drying zone or natural drying, and the thermoplastic shrinkable film sheet 1a and the nonwoven fabric 2 are integrated through the adhesive 6 as shown in FIG. It is set as the shrink insulation film F for containers and packaging.
[0024]
As the material of the thermoplastic shrinkable film sheet 1a, stretched polystyrene (OPS) or polyester (PET) generally used for a horizontal uniaxial thermoplastic shrinkable film as long as the shrinkage in the vertical direction has the shrinkage properties as described above. , Polyethylene (PE), polypropylene (PP), vinyl chloride (PVC), cyclic olefin, etc. can be adopted, but in terms of achieving high shrinkage performance as a lateral shrinkage rate, made of PET or OPS It is preferable to do. Moreover, what is necessary is just to use the thing about 20-60 micrometers as the thickness. Furthermore, you may make it mix | blend a lubricant, an antistatic agent, a UV absorber, etc. with the said thermoplastic shrink film sheet 1a suitably according to the intended purpose.
[0025]
The material of the nonwoven fabric 2 is preferably made of a general-purpose plastic such as polypropylene (PP), polyethylene (PE), or polyester (PET) from the viewpoint of price.
[0026]
The adhesive 6 needs to be selected according to the material of the thermoplastic shrinkable film sheet 1a. That is, for example, when the thermoplastic shrinkable film sheet 1a is made of PET, an organic solvent-based adhesive used for laminating general films, for example, a polyurethane-based adhesive, as a specific example, A composition obtained by adding a polyisocyanate to a polyester polyurethane polyol may be used. When the thermoplastic shrinkable film sheet 1a is made of OPS, an aqueous urethane adhesive 6 or an acrylic resin adhesive is used. An adhesive 6 that is soluble in an alcohol-based solvent such as polyether / polyurethane is selected.
[0027]
When the container packaging shrinkable heat insulating film F is mounted on the packaging target container 3, the container packaging shrinkable heat insulating film F is adapted to the printing when the thermoplastic shrinkable film sheet 1a is printed. When nothing is printed at the required position, after slitting to the required width corresponding to the outer peripheral dimension of the portion of the packaging target container 3 to be packaged, the nonwoven fabric 2 surface should be on the top. As shown in FIG. 2 (a), the nonwoven fabric 2 is folded inward through a bag making machine (not shown), and the main shrinkage direction of the thermoplastic shrinkable film sheet 1a in the shrinkable heat-insulating film F for container wrapping is obtained. Both end edges in the width direction (arrow X direction in the figure) are overlapped in the inner and outer directions over the required dimensions, and the thermoplastic shrink film sheet 1a surface of one end edge arranged on the inner side and the other end arranged on the outer side Edge non-woven The two surfaces are centered by the adhesive 6 in the same manner as in the case where the thermoplastic film sheet 1a and the nonwoven fabric 2 are bonded in the case of manufacturing the container-wrapping shrinkable heat insulating film F shown in FIGS. Sealing is performed to form a tube in a tube shape in which the outer surface is the thermoplastic shrink film sheet 1 a and the inner surface is the nonwoven fabric 2. Next, the tube-shaped container-wrapping shrinkable heat insulating film F is cut to a specified size, and then placed on the outer periphery of the container 3 as shown in FIG. 2 (b), and steam is used in this state. A predetermined heat shrinkage condition is applied by passing the shrinkage tunnel, and the thermoplastic shrinkable film sheet 1a disposed on the outer surface of the tube-like shrinkable heat insulating film for container packaging F is heat-shrinked. As shown in (c), it is attached in close contact with the outer periphery of the packaging target container 3.
[0028]
When the predetermined shrinkage condition is applied to the outer periphery of the packaging target container 3 to cause shrinkage, the thermoplastic shrinkable film sheet 1a is in a direction orthogonal to the main shrinkage direction (the arrow X direction in the figure). Since the shrinkage rate in the direction of arrow Y) is 4% or less, the thermoplastic shrinkable film sheet 1a is packaged on the outer peripheral side of the nonwoven fabric 2 that hardly shrinks in the main flow direction of the fibers 2a. It is prevented that the target container 3 is greatly shrunk in the vertical direction. For this reason, a top curl or the like that occurs when the conventional thermoplastic shrink film sheet 1 shrinks greatly on the outer peripheral side of the nonwoven fabric 2 that does not shrink. Occurrence of the bottom curl phenomenon is prevented.
[0029]
Thus, according to the shrinkable heat insulating film F for container packaging of the present invention, the packaging target container 3 can be packaged with the nonwoven fabric 2 inside and the thermoplastic shrinkable film sheet 1a arranged on the outer surface. Even if the packaging with heat insulation performance based on the presence of voids between the fibers 2a of the non-woven fabric 2 can be performed and the beverage packed in the packaging target container 3 is warmed to 55 to 60 ° C., the contents Since it is possible to suppress the heat from being directly transmitted to the outside through the container wall and the packaging, the packaging target container 3 can be held in the hand. Further, since the thermoplastic film sheet 1a can be printed, a container label having heat insulation can be easily manufactured.
[0030]
Furthermore, since the occurrence of the curl phenomenon can be prevented even when a predetermined thermal shrinkage condition for shrinking the thermoplastic shrinkable film sheet 1a is given, it is possible to prevent the appearance of poor appearance.
[0031]
Furthermore, as the horizontal uniaxial thermoplastic shrinkable film sheet 1a, the shrinkage rate in the transverse direction, which is the main shrinkage direction, is set to 60% or more under the predetermined heat shrinkage treatment conditions. Based on the shrinkable physical properties of the thermoplastic shrinkable film sheet 1a, the shrinkable heat insulating film F for container packaging according to the present invention can be sufficiently adhered to the outer periphery of the container 3 to be packaged. Even when the container 3 is provided with a screw-type lid 3a, the packaging-type container 3 can be reliably held via packaging, so that the screw-type lid 3a can be attached without rotating the packaging-target container 3. Can be opened easily.
[0032]
Furthermore, since the occurrence of the curling phenomenon in the heat shrink process can be prevented, the heat shrink condition can be strengthened, and if the heat shrink condition is strengthened in this way, the packaging can be tightly adhered to the packaging target container 3. In addition, by strengthening the heat shrinkage condition as described above, the packaging can be sufficiently shrunk and closely adhered to a portion that requires a large shrinkage, such as the shoulder portion of the packaging target container 3. It becomes possible.
[0033]
The shrink wrapping film F for container wrapping of the present invention is coated with the adhesive 6 on one side of the thermoplastic uniaxial shrink film sheet 1a, and the nonwoven fabric 2 is laminated when the adhesive 6 is in a wet state. Since the agent 6 is produced by drying, the production can be easily performed.
[0034]
In addition, this invention is not limited only to the said embodiment, The shrinkable heat insulation film F for container packaging may be used only as container packaging in which heat insulation is requested | required instead of as a label, The object of packaging The container 3 can be used for packaging containers other than plastic bottles, bottles, and cans as long as it is desired not to transmit the heat of the contents to the outside. It can be used for packaging cold insulation of the contents and when heat transfer from the outside to the container contents is required. In the above, in order to cope with the heat shrinkage conditions due to the shrink tunnel using steam Although the shrinkage property of the thermoplastic uniaxial shrinkable film sheet 1a was defined under a temperature condition of immersing in warm water of 95 ° C. for 10 seconds, the attachment to the container 3 to be packaged was performed using an oil bath or hot air. When the heat shrinking conditions used at the time of mounting the container are different, for example, the shrinkage physical properties in the direction orthogonal to the main shrinking direction of the thermoplastic uniaxial shrinkable film sheet 1a under the heat shrinking treatment conditions actually used, Needless to say, the physical properties of the contraction in the contraction direction may be defined, and other various modifications may be made without departing from the scope of the present invention.
[0035]
【Example】
(1)
As the thermoplastic shrinkable film sheet 1a, the shrinkage property when made of PET and immersed in warm water of 95 ° C. for 10 seconds has a shrinkage ratio of 80.0% in the transverse direction (main shrinkage direction) and the longitudinal direction (mainly Prepare a sheet with a shrinkage ratio of 0.0% in the direction orthogonal to the shrinking direction, and print the required pattern on the thermoplastic shrinkable film sheet 1a in advance using urethane ink on a printing machine in advance. After the adhesive 6 is applied to the printing surface of the thermoplastic shrink film sheet 1, the basis weight 20 g / m is applied to the wet adhesive 6 coating surface. ² The PP nonwoven fabric 2 was laminated and dried to produce a shrink-insulating film F for container packaging.
This container-wrapping shrinkable heat insulating film F was bagged into a tube shape so that the nonwoven fabric 2 surface was folded inward through a bag making machine, then cut into specified dimensions, and filled with a beverage to become a container 3 to be packaged. After passing through a contraction tunnel using steam in the state of being arranged on the outer periphery of the body of the bottle can, it can be contracted neatly along the outer shape of the container and adhered, and the appearance such as top curl It was possible to install it as a label without any defects.
In the state where the packaging target container 3 to which the label made of the shrinkable heat insulating film F for container packaging was attached was held by the label portion in the hand, the container was smoothly opened by twisting the lid of the can.
(2)
The shrinkage property of the thermoplastic shrink film sheet 1a made of PET is 74.0% in the transverse direction (main shrinkage direction) when immersed in warm water of 95 ° C. for 10 seconds, and the longitudinal direction (main shrinkage). The shrinkage insulation film F for container packaging was manufactured in the same manner as in Example (1), assuming that the shrinkage rate in the direction orthogonal to the direction was 2.0%.
After making this container-shrinkable heat insulating film F into a tube shape, cut it into the required length, place it on the outer periphery of the packaging target container 3 filled with beverage, and let it pass through a shrink tunnel using steam. As a result, although it tended to shrink until it was in close contact with the container and became a top curl, the appearance did not deteriorate.
(3)
The shrinkage property of the thermoplastic thermoplastic film sheet 1a made of PET is 72.0% in the transverse direction (main shrinkage direction) when immersed in warm water of 95 ° C. for 10 seconds, and the longitudinal direction (main shrinkage). The shrinkage insulation film F for containers and packaging was manufactured in the same manner as in Example (1), assuming that the shrinkage in the direction perpendicular to the direction was 5.0%.
After making this container-shrinkable heat insulating film F into a tube shape, cut it into the required length, place it on the outer periphery of the packaging target container 3 filled with beverage, and let it pass through a shrink tunnel using steam. As a result, top curl occurred. When the shrinkage conditions were loosened to prevent this top curl, the packaging object 3 was loosely wrapped and did not go down to the appearance failure. When the lid was twisted with the label portion of the packaging target container 3 held in hand, the packaging target container 3 easily turned around in the label, and could not be easily opened.
(4)
When the shrinkage property of the thermoplastic shrink film sheet 1a made of PET is immersed in warm water of 95 ° C. for 10 seconds, the shrinkage in the horizontal direction (main shrinkage direction) is 60.0% and the vertical direction (main shrinkage). In the same manner as in Example (1), a shrinkable heat insulating film F for container packaging was manufactured assuming that the shrinkage rate in the direction orthogonal to the direction was 7.0%.
After making this container-shrinkable heat insulating film F into a tube shape, cut it into the required length, place it on the outer periphery of the packaging target container 3 filled with beverage, and let it pass through a shrink tunnel using steam. As a result, a top curl was generated, and even when the shrinkage treatment conditions were relaxed, the top curl did not fit and the appearance was poor.
(5)
When the thermoplastic shrink film sheet 1a is made of OPS and immersed in warm water at 95 ° C. for 10 seconds, the shrinkage rate in the horizontal direction (main shrinkage direction) is 68.0% and the vertical direction (perpendicular to the main shrinkage direction) The shrinkage rate of -5.0%, alcohol-soluble acrylic ink as the printing ink, and water-based urethane adhesive as the adhesive 6 respectively, and Example (1) Similarly, the shrinkable heat insulating film F for container packaging was produced.
After making this container-shrinkable heat insulating film F into a tube shape, cut it into the required length, place it on the outer periphery of the packaging target container 3 filled with beverage, and let it pass through a shrink tunnel using steam. As a result, there was no problem and it was in close contact with the outside of the container 3 to be packaged, and no top curl was observed.
[0036]
【The invention's effect】
As described above, according to the shrinkable heat insulating film for container packaging of the present invention, the following excellent effects are exhibited.
(1) On one side of a thermoplastic uniaxially shrinkable film sheet having shrinkage properties such that the shrinkage rate in the direction perpendicular to the main shrinkage direction is 4% or less under predetermined heat shrinkage treatment conditions that are applied when mounted on the container. It cannot be shrunk in the main flow direction of the fiber and is made to follow by narrowing the distance between the fibers in the direction perpendicular to the main flow direction of the fiber. Since the nonwoven fabric is configured by laminating and integrating so that the main flow direction of the fibers of the nonwoven fabric is orthogonal to the main shrink direction of the thermoplastic uniaxial shrinkable film sheet, the heat insulating performance based on the voids of the nonwoven fabric Since the curl phenomenon can be prevented from occurring even if given heat shrinkage conditions are given, the possibility of appearance defects can be prevented. In addition, it is possible to strengthen the heat shrinkage condition by preventing the occurrence of the curling phenomenon in the heat shrink process, and by strongly strengthening the heat shrink condition in this way, the packaging is more closely attached to the packaging target container. In addition, by strengthening the heat shrink condition as described above, the package can be sufficiently shrunk and brought into close contact with a portion that requires a large shrinkage, such as a shoulder portion of the container to be packaged.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of a shrink-wrapping heat insulating film for container packaging according to the present invention, in which (A) is a schematic perspective view showing the middle of the manufacturing process and (B) is a manufactured state.
FIG. 2 shows a procedure for packaging a container to be packaged with the container-shrinkable heat insulating film of FIG. 1, wherein (a) shows a tube-shaped state and (b) shows the outer circumference of the container to be packaged. (C) is a schematic diagram showing a state in which the contracted tunnel is passed through.
3A is a schematic perspective view showing an example of a shrink film for container packaging obtained by a conventionally proposed manufacturing method, and FIG. 3B is a film having the same configuration as the film shown in FIG. It is a schematic diagram which shows the state with which the produced label was mounted | worn to the container.
[Explanation of symbols]
F Shrink insulation film for containers and packaging
1,1a Thermoplastic shrink film sheet (thermoplastic uniaxial shrink film sheet)
2 Nonwoven fabric
2a fiber
6 Adhesive

Claims (1)

Under a predetermined heat-shrinking treatment condition that is applied when the container is mounted, the main fiber is formed on one side of a thermoplastic uniaxial shrinkable film sheet having shrinkage properties such that the shrinkage rate in the direction orthogonal to the main shrinkage direction is 4% or less. A nonwoven fabric that cannot be shrunk in the flow direction and is made to follow by narrowing the distance between the fibers in a direction orthogonal to the main flow direction of the fibers, and the main flow direction of the fibers of the nonwoven fabric is the thermoplastic A shrinkable heat insulating film for container packaging, characterized in that it has a structure in which the layers are integrated so as to be orthogonal to the main shrinkage direction of the uniaxial shrinkable film sheet.

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