JP2012032658A - Roll shrink label, and container with roll shrink label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll shrink label simplifying a manufacturing process and facilitating peeling, and a container with the roll shrink label.SOLUTION: A roll shrink label is wound around an outer peripheral surface of a body portion of a container. A base material of the roll shrink label is a longitudinal uniaxial oriented thermal shrinkage film 1. A start end portion 2 and a terminal end portion 3 of the longitudinal uniaxial oriented thermal shrinkage film 1 have peeling start portions 5 at at least either one of width direction both end portions of a seal portion which are thermally welded through a heat seal agent 4, and the heat seal agent is not applied on the peeling start portion 5.

Description

  The present invention relates to a roll shrink label (hereinafter, also simply referred to as “label”), a container with a roll shrink label, and a method for producing the same, and more specifically, a roll shrink label and a roll shrink label that have a simple production process and are easy to peel off. It relates to a container with attached.

  2. Description of the Related Art Conventionally, a cylindrical shrink label that covers the entire circumference of a container such as a beverage has been used. As a container equipped with such a cylindrical shrink label, a method is generally known in which a cylindrical shrink label is manufactured in advance, and is externally fitted on the outer periphery of the container, and then heat-treated to form a shrink. In addition, many improved techniques have been reported for a method of manufacturing a cylindrical shrink label. For example, Patent Document 1 reports a method in which an ultraviolet curable hot melt adhesive is applied to both ends of a shrink label, and the both ends of the label are laminated in a cylindrical shape via the ultraviolet curable hot melt adhesive. Yes.

  Further, both ends of the shrink label are overlapped in a cylindrical shape, the overlapped portion is welded by a semiconductor laser, and the obtained roll shrink label is externally fitted to the container (for example, Patent Document 2), Further, there is also known a method (for example, Patent Document 3) in which both ends of the shrink label are overlapped, the overlapped portion is welded by a carbon dioxide laser, and the obtained roll shrink label is externally attached to a container. Furthermore, a technique of welding using ultrasonic waves instead of lasers is also known (for example, Patent Document 4).

JP 2008-145498 A JP 2009-96527 A JP 2009-12780 A JP 2009-12779 A

  Since the roll shrink labels described in Patent Documents 1 to 4 have a high strength of the seal portion, the seal portion does not peel off even when the roll shrink label is attached to a container and heated and contracted. However, when it is necessary to remove the shrink label in recycling containers, the conventional roll shrink label has a problem that it cannot be easily removed.

  On the other hand, since the shrink label is thermally contracted in the stretching direction, it is attached to the container with the stretching direction and the body winding direction aligned. Conventionally, a horizontal uniaxially stretched film is used, and after cutting to a predetermined label length, the cut shrink label is rotated 90 degrees and then formed into a cylindrical shape, and the cylindrical label is vertically oriented from the top of an upright container. I was wearing it. That is, since the cut surface of the shrink label roll cannot be used as an adhesive portion, a step of rotating the label by 90 degrees is required when adhering in a cylindrical shape. If such a process can be eliminated, the manufacturing process of the roll shrink label can be simplified, but conventionally, such a process has been essential.

  Accordingly, an object of the present invention is to provide a roll shrink label and a container with a roll shrink label that have a simple manufacturing process and can be easily peeled off.

  In order to solve the above-mentioned problems, the present inventors diligently studied the method of welding the labels. As a result, the present inventors have found that the above-mentioned problems can be solved by adopting the following configuration, and have completed the present invention. .

That is, the roll shrink label of the present invention is a roll shrink label that is wound around the outer peripheral surface of the body of the container.
It consists of a longitudinally uniaxially stretched heat-shrinkable film, and the start and end portions of the longitudinally uniaxially stretched heat-shrinkable film have peeling start portions at at least one of both ends in the width direction of the seal portion heat-sealed via a heat sealant. The peeling start part is not coated with a heat sealant.

In addition, the roll shrink label of the present invention is a roll shrink label that is wound around and attached to the outer peripheral surface of the body of the container
It consists of a longitudinally uniaxially stretched heat-shrinkable film, and the start and end portions of the longitudinally uniaxially stretched heat-shrinkable film have peeling start portions at at least one of both ends in the width direction of the seal portion heat-sealed via a heat sealant. The peel strength at 25 ° C. after heat shrinkage of the heat sealant applied to the peeling start part (hereinafter also referred to as “peel strength (25 ° C.)”) It is characterized by being smaller than the peel strength (25 ° C.). Here, the peel strength is a value obtained by cutting a test piece into a length of 50 mm and a width of 15 mm, peeling off the end portion to create a picking margin, and measuring at 300 mm / min by 180 degree peeling according to JIS K6854. .

  In the present invention, the peel strength (25 ° C.) of the seal portion is preferably 3.0 to 10.0 N / 15 mm. Moreover, in this invention, design printing can be suitably given to at least one of the surface and back surface other than the said start part and the said terminal part. Furthermore, in the present invention, impulse sealing or heat sealing can be used as the heating means in the thermal welding. Furthermore, in the present invention, the heat sealant includes a vinyl chloride vinyl acetate copolymer system, an ethylene vinyl acetate system, a polyolefin system, an ethylene acrylate system, a polyacrylate system, or a polyester system organic solvent heat seal agent, A modified polyolefin-based water-based heat sealant, anchor coat agent, or primer containing an ethylene acrylate, ethylene vinyl acetate, or ethylene acrylate resin can be used. Furthermore, in the present invention, the longitudinal uniaxially stretched heat-shrinkable film is a stretched polypropylene film, a stretched cyclic polyolefin film, a stretched polyolefin film, a stretched styrene film, a stretched polyester film, a polylactic acid film, a stretched polychlorinated film. At least one or more monolayer or multilayer film selected from the group consisting of vinyl film, expanded polyolefin film, expanded polystyrene film, and polyester-polystyrene coextruded film can be used, and heat in the longitudinal direction at 100 ° C. The shrinkage rate is preferably 5 to 85%. Furthermore, in the present invention, it is preferable that the dry film thickness of the heat sealant is 0.1 to 10 μm. Moreover, in this invention, it is preferable that the width | variety of the said seal part is 1-20 mm.

  The container with a roll shrink label of the present invention is characterized by being mounted with the roll shrink label of the present invention and heat-treated.

  ADVANTAGE OF THE INVENTION According to this invention, a manufacturing process is simple and the roll shrink label and container with a roll shrink label which are easy to peel can be provided.

It is a figure which shows an example of application | coating of the heat seal agent of the seal part which concerns on the roll shrink label of suitable one Embodiment of this invention. It is a figure which shows an example of application | coating of the heat seal agent of the seal part which concerns on the roll shrink label of other suitable embodiment of this invention. It is a partial schematic diagram of one suitable embodiment of the manufacturing method of the container with a roll shrink label of the present invention, (a) is a conveyance process, (b) is a cutting process, (c) and (d) are welding processes. Show.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The roll shrink label of the present invention is a roll shrink label that is wound around and mounted on the outer peripheral surface of the body of the container. In the present invention, it is important that the roll shrink label is composed of a longitudinally uniaxially stretched heat-shrinkable film. As described above, since the shrink label is thermally contracted in the stretching direction, it is necessary to mount the shrink label on the container so that the stretching direction matches the body winding direction. Therefore, in the present invention, a longitudinal uniaxially stretched heat-shrinkable film is used as the base film, and the stretching direction of the base film is matched with the winding drum direction. Thereby, in the manufacturing process, it is possible to omit the process of rotating the label that has been conventionally required by 90 degrees, and the manufacturing process of the roll shrink label is simplified. Moreover, since the label peripheral diameter can be reduced by about 10%, the label area can be reduced and the cost is excellent.

  Also, conventionally, a shrink label that has been pasted in a cylinder is opened with a labeler and attached to a container. Therefore, the shrink label requires a certain level of strength, and there is a limit to thinning the roll shrink label. . However, since the roll shrink label of the present invention uses a longitudinally uniaxially stretched heat-shrinkable film, it can be welded in a cylindrical shape simply by moving the shrink label in the horizontal direction. For this reason, the opening process is unnecessary, and the cost can be reduced by reducing the thickness of the shrink label. While having such advantages, it can be mounted on a deformable container as in the conventional case, and the design properties equivalent to those in the conventional case can be maintained.

  As a preferred embodiment of the present invention, the roll shrink label is made of a longitudinally uniaxially stretched heat-shrinkable film, and as shown in FIG. It is also important that the peeling start part 5 has at least one of both ends in the width direction of the seal part thermally welded via the heat sealant 4 and the heat sealant is not applied to the peel start part 5. . Since the heat sealant is not applied to the peeling start part 5, the label can be easily peeled from the peeling start part 5. In this case, from the viewpoints of sealing properties and peelability, it is preferable that the peel start portion 5 be picked and peeled off.

  In another preferred embodiment of the present invention, the roll shrink label is made of a longitudinally uniaxially stretched heat-shrinkable film, and in addition, as shown in FIG. 13 has a peeling start portion 15 at at least one of both end portions in the width direction of the seal portion thermally welded via the heat sealing agent 14, and the peeling strength (25 ° C.) of the heat sealing agent 14a applied to the peeling start portion 15 ) Is smaller than the peel strength (25 ° C.) of the heat sealant 14b applied to other than the peeled portion. Since the peel strength of the heat sealant 14a at the peel start portion 15 is smaller than the peel strength (25 ° C.) of the heat seal agent 14b at other portions, the label can be peeled easily from the peel start portion.

  As a method of making the peel strength (25 ° C.) of the heel sealant 14a of the peel start portion 15 smaller than the peel strength (25 ° C.) of the heat seal agent 14b of the seal portion other than the peel start portion 15, the heat seal agent 14a , 14b can be controlled by changing the type of heat sealant 14a, 14b to be applied, or applying a release agent to the peeling start portion 15. For example, when changing the application amount of the heat sealing agent 14a, 14b, the above requirement can be satisfied by reducing the application amount of the heat sealing agent 14a of the peeling start portion 15. In addition, when using a release agent, as the release agent, in addition to a silicone release agent mainly composed of polymethylsiloxy acid, a wax release agent, a polyolefin, etc., an ultraviolet curable type mainly composed of urethane acrylate, acrylate, etc. Can be used. Silicone material may be appropriately added to the UV ink to control releasability.

  In this invention, it is preferable that the peeling strength (25 degreeC) of a seal part is 3.0-10.0N / 15mm. If the peel strength (25 ° C.) of the seal portion is less than 3.0 N / 15 mm, sufficient sealability cannot be obtained, and the label may be peeled off during the heat shrinkage stage. On the other hand, if the peel strength (25 ° C.) of the seal portion exceeds 10 N / 15 mm, the seal is too welded and the effects of the present invention may not be obtained satisfactorily.

  In order to set the peel strength (25 ° C.) of the seal portion within the above range, as described above, it is performed by means such as controlling the amount of heat sealant applied or applying a release agent to the peel start portion. be able to. In addition, the area of the peeling start part which occupies for the whole seal part will not be restrict | limited especially if peeling strength is the range which satisfies the said range.

  In this invention, it is preferable that the dry film thickness of a heat seal agent is 0.1-10 micrometers from a peel strength viewpoint. If the film thickness of the heat sealant is less than 0.1 μm, sufficient adhesive strength cannot be obtained, and the label may be peeled off at the stage of heat shrinkage. On the other hand, if the dry film thickness of the heat sealant exceeds 10 μm, the effects of the present invention may not be obtained satisfactorily.

  In the present invention, impulse sealing or heat sealing can be mentioned as means for heat-welding the start and end portions of the longitudinally uniaxially stretched heat-shrinkable film. Here, the impulse seal is a method in which the object to be welded is directly heated and sealed with a nichrome wire as a heating element, and the heat seal is generally in a hot plate made of brass or copper. This is a system in which the heat plate is heated and transmitted by the nichrome wire embedded in the substrate, and the object to be welded is pressed. In the present invention, the impulse seal is preferable to the heat seal because the heat transfer efficiency is good and welding can be performed in a short time. When adopting the impulse seal, the heating temperature is 90 to 260 ° C., the heating time is 0.02 to 2.0 seconds, the cooling time is 0.02 to 2.0 seconds, and the pressurizing condition is 0 to 0.3 MPa. When heat sealing is adopted, the heating temperature is 90 to 260 ° C., the heating time is 0.1 to 3.0 seconds, the cooling time is 0.1 to 3.0 seconds, and the pressure condition is 0. 0.03 to 0.3 MPa is preferable. In addition, when employ | adopting heat sealing, single-sided heating or double-sided heating may be sufficient.

  In the present invention, as the heat sealant, vinyl chloride vinyl acetate copolymer, ethylene vinyl acetate, polyolefin, ethylene acrylate, polyacrylate, or polyester organic solvent heat seal, ethylene acrylate, ethylene A modified polyolefin-based water-based heat sealant, anchor coat agent, or primer containing a vinyl acetate-based or ethylene acrylate-based resin can be used.

  In the present invention, the longitudinally uniaxially stretched heat-shrinkable film is a polyolefin-based film, a polyester-based film, a polystyrene-based film, a polylactic acid-based film, or a laminate film of two or more of these films, and is longitudinally uniaxially stretched. A thing can be used conveniently. Preferably, a stretched polypropylene film, a stretched cyclic polyolefin film, a stretched polyolefin film, a stretched styrene film, a stretched polyester film, a polylactic acid film, a stretched polyvinyl chloride film, a foamed polyolefin film, and a foamed polystyrene film And at least one or more single-layer or multilayer films selected from the group consisting of polyester-polystyrene coextruded films, and the vertical direction thermal shrinkage at 100 ° C. is 5 to 85%.

Generally, one or more of polyolefin resin, polyester resin, polystyrene resin, polylactic acid resin is used, and extrusion method, cast molding method, T-die method, cutting method, inflation method, etc. Films formed in a single layer using the film-forming method, films formed by coextrusion using two or more resins, or films formed using a mixture of two or more resins What is used can be used, and various stretched films formed by longitudinal uniaxial stretching by a tenter method, a tubular method, or the like can be used. The heat shrinkage rate is defined by the following formula.
Thermal contraction rate (%) = ((dimension before heating) − (dimension after heating)) / (dimension before heating) × 100

  In the present invention, the thickness of the heat-shrinkable film is not particularly limited, but is appropriately selected within a range that does not impair heat resistance, rigidity, mechanical suitability, appearance, etc. In the case of a non-foaming vertically uniaxially stretched film, it is 15 to 50 μm. is there. Moreover, in the case of a foam longitudinally uniaxially stretched film, it is 50-200 micrometers. If it is the said range, when mounting | wearing and using for a container, sufficient mechanical strength is securable. In addition, the thickness of a heat-shrinkable film is the thickness before heat-shrinking.

  Furthermore, in this invention, it is preferable that the width | variety of a seal part is 1-20 mm. This is because if the width of the portion to be thermally welded is less than 1 mm, sufficient adhesive strength may not be obtained. On the other hand, if the width of the portion to be heat-welded exceeds 20 mm, the overlapped portion is liable to be displaced and the cosmetic appearance may be impaired.

  In the present invention, the heat-shrinkable film may be subjected to design printing on at least one of the front surface and the back surface other than the starting end portion and the terminal end portion. The design print layer may be provided on the innermost label or the outermost layer of the heat-shrinkable film. The printing method is not limited, and may be a printing method such as gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or the like.

  In addition, various additives such as a lubricant, a filler, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antistatic agent, a flame retardant, and a colorant may be added to the heat shrink film as necessary. . Further, the surface of the longitudinally uniaxially stretched heat-shrinkable film may be subjected to conventional surface treatments such as corona discharge treatment, plasma treatment, flame treatment, and acid treatment in order to improve printability.

  The container with the roll shrink label of the present invention is a container in which the roll shrink label of the present invention is attached to the container and subjected to heat treatment, and the container is inserted into the container from the upper part or the lower part of the roll shrink label of the present invention. It can be manufactured by attaching a roll shrink label and then heat shrinking it. Containers include glass containers, synthetic resin containers such as PET (polyethylene terephthalate), inorganic containers such as ceramic bottles, metal containers such as aluminum, iron, and SUS, glass, synthetic resins, ceramics, metals, paper, etc. It can be suitably mounted on a container made of a composite material.

  When the container is a synthetic resin container, as the thermoplastic resin layer constituting the container, it is lightweight to use a polyester resin such as PET, a polyolefin resin such as polypropylene, or a polylactic acid resin, It is preferable because it is excellent in mechanical strength, heat resistance, gas barrier properties, chemical resistance, fragrance retention, hygiene, and the like. In particular, polylactic acid-based resins are biodegradable and are preferable from the viewpoint of environmental considerations. The container can be manufactured by injection molding, vacuum forming, pressure forming, or the like of polyester resin or polyolefin resin.

Next, the manufacturing method of the container with a roll shrink label of this invention is demonstrated.
The method for manufacturing a container with a roll shrink label according to the present invention includes a transporting process for transporting a roll shrink label original, a cutting process for manufacturing a shrink label by cutting the roll shrink label original into a predetermined length, and a shrink label. The start and end portions of the roll are overlapped, the overlapping portion is heat-welded to form a roll shrink label, and the container is inserted from the upper side or the lower side of the roll shrink label to attach the roll shrink label to the container A mounting step and a heat shrinking step of heat shrinking the roll shrink label. In the present invention, a heat uniaxially stretched heat-shrink film is used as the roll shrink label raw material, and a heat sealant is applied to at least one of the front surface of the shrink label and the back surface of the terminal before the welding step. It is important to perform heat welding by impulse sealing or heat sealing. Hereinafter, it explains in detail using a drawing.

  FIGS. 3A to 3D are schematic views of a part of the manufacturing process of a preferred embodiment of the method for manufacturing a container with a roll shrink label of the present invention. FIG. 3A shows a transporting process for transporting the roll shrink label printing original fabric. In the transporting process, the longitudinally uniaxially stretched heat-shrinkable film 1 drawn from the original fabric roll 6 maintains a constant tension. Then, it is continuously supplied toward a cutting device (not shown) that cuts the longitudinally uniaxially stretched heat-shrinkable film 1 with a predetermined size. As described above, in the present invention, it is important to use the longitudinally uniaxially stretched heat-shrinkable film 1 as the roll shrink label raw material, and thus, after cutting into a conventional predetermined label length in the welding step described later. It is possible to omit the process of forming the cylindrical label after rotating the cut label by 90 ° and mounting the cylindrical label in the vertical direction from the upper part of the upright container. In addition, the cost can be reduced by reducing the thickness of the shrink label. In the present invention, as the longitudinally uniaxially stretched heat-shrinkable film, the aforementioned longitudinally uniaxially stretched heat-shrinkable film can be suitably used.

  In the cutting step (see FIG. 3B), the continuously supplied longitudinally uniaxially stretched heat-shrinkable film 1 is cut into a predetermined length, and the shrink label 7 is manufactured. In this way, the shrink label 7 cut to a predetermined length is sent to the welding process. In the present invention, the heat sealant 4 is applied to at least one of the front surface of the start end 2 and the back surface of the end end 3 before the welding step. At this time, the heat sealant is not applied to at least one of both end portions in the width direction of the seal portion formed by overlapping the start end portion 2 and the end portion 3 (FIG. 3B). Alternatively, at least one of both ends in the width direction of the seal portion is applied with a heat seal agent having a peel strength smaller than the peel strength of the heat seal agent in the other portion, or at both ends in the width direction of the seal portion. A release agent is further applied to at least one of them (not shown).

  In the illustrated example, the heat sealant 4 is applied to the back surface of the end portion 3 of the shrink label 7, but the heat sealant is not applied to one of the end portions in the width direction of the seal portion, and this portion starts to be peeled off. This is part 5. The heat sealant is usually printed (applied) at the end of the design layer as one of the colors when design printing is performed on the base film, and then the base film is cut into a predetermined length. In the method, after applying the heat sealant at a predetermined interval, the longitudinal uniaxially stretched heat-shrinkable film may be cut, or after cutting the longitudinally uniaxially stretched heat-shrinkable film, the heat sealant may be applied. When a release agent is applied on the heat sealant, the release agent may be printed at the end of the design layer. In addition, as a heat seal agent, the above-mentioned heat seal agent can be used suitably.

  In the welding process, the roll shrink label 10 is manufactured by stacking the start end portion 2 and the end end portion 3 of the shrink label coated with the heat seal agent 4 into a cylindrical shape and thermally welding the seal portion 8. For example, the shrink label 7 is sucked with air and wound around the cylinder 9 so as to coincide with the film flow (FIG. 3 (c)), the seal portion 8 (FIG. 3 (d)) is formed, and the seal portion 8 is thermally welded. To do. As the cylinder 9, for example, a stainless steel air vacuum cylindrical cylinder can be used. In the present invention, impulse sealing or heat sealing can be suitably used as the welding means. Suitable conditions for impulse sealing and heat sealing are as described above. The present invention does not use an ultrasonic device, a semiconductor laser, and a carbon dioxide gas laser, which have been proposed for the welding of shrink labels, so it can reduce the cost of equipment and prevent deterioration of the cosmetic appearance. can do. In the present invention, from the viewpoint of the welding strength and the like, the width of the welded portion is preferably about 1 to 20 mm.

  The roll shrink label that has undergone the welding process is then sent to a mounting process (not shown). In the mounting step, the cylinder is pulled out from below and the container is inserted from the upper side or the lower side of the roll shrink label to mount the roll shrink label on the container. Specifically, if a large number of air holes are provided in the cylinder and the air is discharged from the air holes of the cylinder after welding with a carbon dioxide laser beam, the air can be sent between the cylinder and the roll shrink label. . In this state, when the cylinder is moved downward from the lower end of the roll shrink label, the cylinder can be easily pulled out from the roll shrink label. The container is lowered from the upper part of the roll shrink label, and the roll shrink label is attached to the container. Or the aspect which pulls out a cylinder from the upper part side of a roll shrink label, and inserts a container from the lower part side may be sufficient.

  Thereafter, the container to which the roll shrink label is bonded is sent to a heat shrinking step (not shown), and heat is applied to shrink the roll shrink label in the body winding direction. For example, hot air of 60 to 220 ° C., steam heated by steam and steam from which water vapor is condensed, or radiant heat such as infrared rays is applied. Thereby, the container with a roll shrink label by which the trunk | drum of the container was coat | covered with the roll shrink label can be manufactured.

<Example 1>
A label design was printed on the back surface of a vertically uniaxially stretched polypropylene film having a width of 115 mm and a film thickness of 30 μm (heat shrinkage in the flow direction at 100 ° C. × 10 seconds was 40%) using a gravure printing machine. Then, heat sealant (main component: vinyl chloride vinyl acetate copolymer resin, solid content 25%, main solvent: methyl ethyl ketone / ethyl acetate), coating thickness 5 μm, coating width 20 mm, heat sealant as peeling start part The area | region which is not apply | coated is apply | coated so that it may become 10 mm from one edge part, and it dried with the hot air of 60-70 degreeC for 5 second, and obtained the label for a test.

  The obtained label was overlapped with 20 mm at the beginning and end, and the heating time was 0.1 second, the cooling time was 0.1 second, the pressure condition was 0.1 MPa, and the seal width was 15 mm (from the label end to 15 mm). Impulse sealing was performed under the conditions, and heat welding was performed. The obtained roll shrink label was attached to a PET bottle and heated in a steam type shrink tunnel at 90 ° C. for 10 seconds to cause the label to shrink and adhere to the bottle.

  The container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and even when the container with the label is dropped from a height of 50 cm, the label does not fall off and sufficient adhesive strength is obtained. It was. The peel strength in the winding direction was 8.0 N / 15 mm, and could be peeled by hand from the end.

  The peel strength is 180 mm in accordance with JIS K6854 using a tensile tester (Orientec Co., Ltd.) by cutting the test piece into a length of 50 mm and a width of 15 mm and peeling off the end portion to prepare a picking margin. It was measured at 300 mm / min by degree peeling.

<Example 2>
A label design was printed on the back surface of a longitudinally uniaxially stretched PET film having a width of 115 mm and a film thickness of 15 μm (heat shrinkage in the flow direction at 100 ° C. × 10 seconds is 45%) using a gravure printing machine. Thereafter, a heat sealant (main component: polyester resin, solid content: 31.5%, main solvent: methyl ethyl ketone / toluene) was applied so that the coating thickness was 5 μm and the coating width was 20 mm, and hot air at 60 to 70 ° C. After drying for 5 seconds, a silicon release agent was applied as a peeling start portion over 10 mm from one end portion to obtain a test label.

  The 20 mm of the start and end portions of the obtained label are overlapped, and the heating time is 0.3 seconds, the cooling time is 0.3 seconds, the pressing condition is 0.1 MPa, and the seal width is 15 mm (from the label end portion to 15 mm). Impulse sealing was performed under the conditions, and heat welding was performed. The obtained roll shrink label was attached to a PET bottle and heated in a steam type shrink tunnel at 90 ° C. for 10 seconds to cause the label to shrink and adhere to the bottle.

  The container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and even when the container with the label is dropped from a height of 50 cm, the label does not fall off and sufficient adhesive strength is obtained. It was. The peel strength in the winding direction was 6.0 N / 15 mm and could be peeled by hand from the end.

<Example 3>
A label design was printed on the inner surface of a longitudinally uniaxially stretched polystyrene film having a width of 115 mm and a film thickness of 35 μm (heat shrinkage in the flow direction at 100 ° C. × 10 seconds is 60%) using a gravure printer. Thereafter, a heat sealant (main component: polyacrylate resin, solid content: 30%, main solvent: ethyl acetate) was applied so that the coating thickness was 5 μm and the coating width was 20 mm, and heated with hot air at 60 to 70 ° C. After drying for 2 seconds, a silicon release agent was applied over 10 mm from one end as a peeling start portion to obtain a test label.

  The obtained label was overlapped with 20 mm at the beginning and end, and the heating time was 0.2 seconds, the cooling time was 0.2 seconds, the pressure condition was 0.1 MPa, and the seal width was 15 mm (from the label end to 15 mm). Impulse sealing was performed under the conditions, and heat welding was performed. The obtained roll shrink label was attached to a PET bottle and heated in a steam type shrink tunnel at 90 ° C. for 10 seconds to cause the label to shrink and adhere to the bottle.

  The container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and even when the container with the label is dropped from a height of 50 cm, the label does not fall off and sufficient adhesive strength is obtained. It was. The peel strength in the winding direction was 4.0 N / 15 mm, the label was sufficiently sealed up to the end of the label, and the appearance was good. Moreover, it was able to peel by hand from the edge part.

<Comparative Example 1>
A roll shrink label was obtained by the same operation as in Example 1 except that the heat sealant was not applied.

When the obtained roll shrink label was attached to a PET bottle and heated in a steam type shrink tunnel at 90 ° C. for 10 seconds to cause the label to shrink and adhere to the bottle, the sealed portion was peeled off due to heat shrinkage.
<Comparative example 2>
A roll shrink label was obtained by the same operation as in Example 2 except that the coating thickness of the heat sealant was 20 μm.

  The obtained roll shrink label was attached to a PET bottle and heated in a steam type shrink tunnel at 90 ° C. for 10 seconds to cause the label to shrink and adhere to the bottle.

  The container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and even when the container with the label is dropped from a height of 50 cm, the label does not fall off and sufficient adhesive strength is obtained. It was. The peel strength in the winding direction was 12 N / 15 mm, and it was difficult to peel by hand from the end.

<Comparative Example 3>
The same operation as in Example 1 was performed except that the heat sealant was applied to the entire seal portion.

  The container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and even when the container with the label is dropped from a height of 50 cm, the label does not fall off and sufficient adhesive strength is obtained. It was. The peel strength in the winding direction was 6.0 N / 15 mm, and the label end portion was sufficiently sealed, and the appearance was good. However, since there was no peeling start part, it was difficult to peel by hand.

DESCRIPTION OF SYMBOLS 1,11 Longitudinal uniaxial stretching heat-shrink film 2,12 Start part 3,13 Termination part 4,14a, 14b Heat seal agent 5,15 Peeling start part 6 Original fabric roll 7 Shrink label 8 Seal part 9 Cylinder 10 Roll shrink label

Claims (12)

In the roll shrink label that is wound around the outer peripheral surface of the container body,
It consists of a longitudinally uniaxially stretched heat-shrinkable film, and the start and end portions of the longitudinally uniaxially stretched heat-shrinkable film have peeling start portions at at least one of both ends in the width direction of the seal portion heat-sealed via a heat sealant. The roll shrink label is characterized in that no heat sealant is applied to the peeling start part. In the roll shrink label that is wound around the outer peripheral surface of the container body,
It consists of a longitudinally uniaxially stretched heat-shrinkable film, and the start and end portions of the longitudinally uniaxially stretched heat-shrinkable film have peeling start portions at at least one of both ends in the width direction of the seal portion heat-sealed via a heat sealant. The peeling strength at 25 ° C. after heat shrinkage of the heat sealant applied to the peeling start part is smaller than the peeling strength at 25 ° C. after heat shrinkage of the heat sealant applied other than the peeling start part. A featured roll shrink label.   The roll shrink label according to claim 1 or 2, wherein the peel strength at 25 ° C of the seal portion after heat shrinkage is 3.0 to 10.0 N / 15 mm.   The roll shrink label as described in any one of Claims 1-3 by which design printing was given to at least one of the surface other than the said start end part and the said terminal part, and a back surface.   The roll shrink label according to any one of claims 1 to 4, wherein the heating means in the heat welding is an impulse seal or a heat seal.   The heat sealant is a vinyl chloride / vinyl acetate copolymer, ethylene vinyl acetate, polyolefin, ethylene acrylate, polyacrylate, or polyester organic solvent heat sealant. The roll shrink label according to one item.   The roll shrink label according to any one of claims 1 to 5, wherein the heat sealant is a modified polyolefin-based water-based heat sealant containing an ethylene acrylate, ethylene vinyl acetate, or ethylene acrylate resin.   The roll shrink label according to any one of claims 1 to 5, wherein the heat sealant is an anchor coat agent or a primer.   The longitudinal uniaxially stretched heat-shrinkable film is a stretched polypropylene film, a stretched cyclic polyolefin film, a stretched polyolefin film, a stretched styrene film, a stretched polyester film, a polylactic acid film, a stretched polyvinyl chloride film, or a foamed polyolefin system. It is at least one monolayer or multilayer film selected from the group consisting of a film, a polystyrene foam film, and a polyester-polystyrene coextruded film, and has a heat shrinkage ratio of 5 to 85% in the longitudinal direction at 100 ° C. The roll shrink label as described in any one of claim | item 1 -8.   The roll shrink label according to any one of claims 1 to 9, wherein a dry film thickness of the heat sealant is 0.1 to 10 µm.   The roll shrink label according to any one of claims 1 to 10, wherein the seal portion has a width of 1 to 20 mm.   A container with a roll shrink label, wherein the roll shrink label according to any one of claims 1 to 11 is mounted and heat-treated.

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