JP2012032657A - Roll shrink label, container with roll shrink label, and method of manufacturing those - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll shrink label having excellent high-speed labeling suitability, workability, seal strength stability, and cost property without impairing an appearance decorative property; a container with a roll shrink label; and a method of manufacturing those.SOLUTION: A roll shrink label 10 wound around an outer peripheral surface of a body portion of a container, is made from a longitudinal uniaxial oriented thermal shrinkage film 2. A heat seal agent 4 is applied on at least one of a front surface of a start end portion 5 or a back surface of a terminal portion 6 of the longitudinal uniaxial oriented thermal shrinkage film 2, and the start end portion 5 and the terminal portion 6 are superimposed and thermally welded through the heat seal agent.

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, high-speed labeling suitability, workability, and seal strength without impairing appearance cosmetics. The present invention relates to a roll shrink label excellent in stability and cost, a container with a roll shrink label, and a production method thereof.

  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

  However, when an ultraviolet curable hot melt adhesive is used, an initiator for ultraviolet curing becomes indispensable, but such an initiator is generally not preferable for use in food packaging. There are many. Further, in the method of welding with a semiconductor laser, it is necessary to press-fix the welded part with a welded part crimping plate made of a transparent material that does not absorb semiconductor laser light during welding. For this reason, the pressure-bonding plate is easily soiled by substances that volatilize at the time of welding, and the welding conditions change due to this dirt, which makes it difficult to manage the apparatus. Moreover, since the apparatus is expensive, it is not practical.

  The method of welding with a carbon dioxide gas laser can be easily welded, but an unwelded portion may occur at the overlapping portion of the label edge. This unwelded portion becomes a hard protrusion after the heat shrink treatment, which causes a loss of touch and cosmetic appearance after label shrinkage. Furthermore, ultrasonic welding is expensive, and in the case of a thin film, the sealing conditions are narrow and it is difficult to obtain a stable sealing property.

  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, a container with a roll shrink label, and a method for producing them, which are excellent in high-speed labeling suitability, workability, seal strength stability, and cost without impairing the cosmetic appearance. There is.

  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 a heat-sealing agent is applied to at least one of the front end surface and the backside of the terminating end portion of the longitudinally uniaxially stretched heat-shrinkable film, and is heat-sealed through the heat-sealing agent. It is characterized by.

  In the present invention, it is preferable that the heat-welded portion is linear and perpendicular to the stretching direction of the heat-shrinkable film. 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 this invention, it is preferable that the width | variety of the part to be heat-welded 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.

The method for producing 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 cutting the roll shrink label original into a predetermined length, and the obtained shrink label. A welding process in which the start and end parts of the roll are overlapped and the overlapped part is thermally welded, a mounting process in which a container is inserted from the upper side or the lower side of the obtained roll shrink label, and a roll shrink label is mounted, and mounting In a method of manufacturing a container with a roll shrink label, comprising:
The roll shrink label original fabric is a longitudinally uniaxially stretched heat-shrink film, and before the welding step, a heat sealant is applied to at least one of the front end surface and the back end surface, and the thermal welding is performed. Is performed through a heat sealant.

  In the present invention, impulse sealing or heat sealing can be suitably used as the heating means in the heat welding.

  According to the present invention, it is possible to provide a roll shrink label, a container with a roll shrink label, and a production method thereof, which are excellent in high-speed labeling suitability, workability, seal strength stability, and cost without impairing appearance cosmetics. it can.

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.

  In the present invention, a heat sealant is applied to at least one of the front end surface and the back end surface of the longitudinally uniaxially stretched heat-shrinkable film, the start end portion and the end portion are overlapped, and the heat sealant is interposed therebetween. It is also important to heat weld. Since the heat sealant melts at a relatively low temperature, it can be stably welded at a low temperature in a short time, and high-speed labeling suitability and workability are improved. In addition, unlike the welding method using a carbon dioxide laser, the appearance of the welded portion is not impaired. Furthermore, sealing strength is also stabilized by using a heat sealing agent. In this case, the heat-welded portion may be spot-like, but from the viewpoint of workability and equipment, the heat-welded portion is preferably linear and perpendicular to the stretching direction of the heat-shrinkable film.

  In the present invention, examples of means for heat welding include impulse sealing and heat sealing. 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 system, ethylene vinyl acetate system, polyolefin system, ethylene acrylate system, polyacrylate system, or polyester system organic solvent heat seal agent, ethylene acrylate system, A modified polyolefin-based water-based heat sealant, anchor coat agent or primer containing an ethylene vinyl acetate or ethylene acrylate 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 the part to heat-weld 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 and back surfaces other than the start end and the end. 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, polyolefin resin, or polylactic acid 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.

  Drawing 1 (a)-(d) is a schematic diagram of a part of manufacturing process of one suitable embodiment of a manufacturing method of a container with a roll shrink label of the present invention. Fig.1 (a) has shown the conveyance process which conveys a roll shrink label printing original fabric, and the vertical uniaxial stretching heat-shrink film 2 pulled out from the original fabric roll 1 maintains a tension | tensile_strength constant in a conveyance process. Then, it is continuously supplied toward a cutting device (not shown) that cuts the longitudinally uniaxially stretched heat-shrinkable film 2 with a predetermined size. As described above, in the present invention, it is important to use a longitudinally uniaxially stretched heat-shrinkable film as the roll shrink label raw material, and in this way, in the welding process described later, after cutting to a conventional predetermined label length It is possible to omit the step of forming the cylindrical label after rotating the 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. 1B), the continuously supplied longitudinally uniaxially stretched heat-shrinkable film 2 is cut into a predetermined length, and the shrink label 3 is manufactured. In this way, the shrink label 3 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 5 and the back surface of the end end 6 before the welding step. In the illustrated example, the heat sealant 4 is applied to the back surface of the end portion 6 of the shrink label 3. By using the heat sealant 4, the heating temperature in the subsequent welding process can be lowered, and it can be stably welded by heating for a short time. Speed can be increased. 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. 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 superimposing the start end portion 5 and the end end portion 6 of the shrink label coated with the heat sealant 4 into a cylindrical shape and thermally welding the overlap portion 8. For example, the shrink label 3 is sucked with air and wound around the cylinder 7 in a cylindrical shape so as to coincide with the film flow (FIG. 1 (c)) to form an overlapping portion 8 (FIG. 1 (d)). The part 8 is heat-welded. As the cylinder, 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.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Example 1>
After the label design is printed on the back side of a longitudinally uniaxially stretched polypropylene film (100 ° C x 10 seconds, 40% heat shrinkage in the flow direction) with a width of 900 mm and a film thickness of 30 µm, the heat sealant is applied so that the coating thickness becomes 5 µm (Main component: vinyl chloride vinyl acetate copolymer resin, solid content: 25%, main solvent: methyl ethyl ketone / ethyl acetate) was applied, and five rows of labels having a width of 175 mm were slit and wound around a paper tube. The obtained label was set on a labeler (roll sleeve labeler), and the label was fed out and cut into a length of 230 mm with a rotary cutter to obtain a single wafer label. The obtained label was sucked with air and wound around a cylinder (stainless steel air vacuum cylindrical cylinder) so as to coincide with the film flow, so that both ends of the label overlapped each other by 20 mm. Thereafter, an impulse seal was applied under the conditions of a heating time of 0.1 second, a cooling time of 0.1 second, a pressurizing condition of 0.1 MPa, and a seal width of 15 mm (from the label end to 15 mm), and heat-welded.

  Thereafter, air was blown out from the cylinder, and the label was lifted, and the cylinder was taken out. At the same time, a 500 mL round PET deformed bottle container was inserted from below, and the label was attached. Subsequently, the label was shrunk by heating at 90 ° C. for 10 seconds in a steam type shrink tunnel, and adhered 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, the label was sufficiently sealed to the end of the label, and the cosmetic appearance was excellent.

<Example 2>
Heat sealant so that the coating thickness becomes 5 μm after printing the label design on the inner surface of a longitudinally uniaxially stretched PET film (width of heat shrinkage of 45% at 100 ° C. × 10 seconds) with a width of 115 mm and a film thickness of 15 μm (Main component: polyester resin, solid content: 31.5%, main solvent: methyl ethyl ketone / toluene) was part coat printed and wound on a paper tube. The obtained label was set on a labeler (roll sleeve labeler), and the label was fed out and cut into a length of 230 mm with a rotary cutter to obtain a single wafer label. The obtained label was sucked with air and wound around a cylinder (stainless steel air vacuum cylindrical cylinder) so as to coincide with the film flow so that both ends of the label overlapped by about 20 mm. Thereafter, an impulse seal was applied and heat-welded under the conditions of a heating time of 0.3 seconds, a cooling time of 0.3 seconds, a pressurizing condition of 0.0 MPa, and a seal width of 10 mm (from the label end to 10 mm).

  Thereafter, air was blown out from the cylinder, the cylinder was taken out with the label floating, and at the same time, a 500 mL round PET deformed bottle container was inserted, and the label was attached. Subsequently, the label was shrunk by heating at 95 ° C. for 10 seconds in a steam type shrink tunnel, and adhered 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 the label end portion was sufficiently sealed, and the appearance was good.

<Example 3>
Label design on the inner surface of a vertically uniaxially stretched polystyrene film with a width of 115 mm and a film thickness of 35 μm (heat shrinkage in the flow direction at 80 ° C. × 10 seconds is 10%, heat shrinkage in the flow direction at 100 ° C. × 10 seconds is 60%) After printing, a heat sealant (main component: polyacrylate resin, solid content: 30%, main solvent: ethyl acetate) was part-coated and wound around a paper tube so that the coating thickness was 5 μm. The obtained label was set on a labeler (roll sleeve labeler), and the label was fed out and cut into a length of 230 mm with a rotary cutter to obtain a single wafer label. The obtained label was sucked with air and wound around a cylinder (stainless steel air vacuum cylindrical cylinder) so as to coincide with the film flow so that both ends of the label overlapped by about 20 mm. Thereafter, an impulse seal was applied and heat-welded under the conditions of a heating time of 0.2 seconds, a cooling time of 0.2 seconds, a pressurizing condition of 0.1 MPa, and a seal width of 10 mm (from the label end to 10 mm).

  Thereafter, air was blown out from the cylinder, the cylinder was taken out with the label floating, and at the same time, a 500 mL round PET deformed bottle container was inserted, and the label was attached. Subsequently, the label was shrunk by heating at 95 ° C. for 10 seconds in a steam type shrink tunnel, and adhered 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.

<Example 4>
Heat seal so that the coating thickness is 5 μm after printing the label design on the inner surface of a vertically uniaxially stretched polypropylene film with a width of 115 mm and a film thickness of 30 μm (heat shrinkage in the flow direction at 100 ° C. × 10 seconds is 40%) The agent (main component: vinyl chloride vinyl acetate copolymer resin, solid content 25%, main solvent: methyl ethyl ketone / ethyl acetate) was part coat printed and wound on a paper tube. The obtained label was set on a labeler (roll sleeve labeler), and the label was fed out and cut into a length of 230 mm with a rotary cutter to obtain a single wafer label. The obtained label was sucked with air and wound around a cylinder (stainless steel air vacuum cylindrical cylinder) so as to coincide with the film flow so that both ends of the label overlapped by about 20 mm. Thereafter, one-side heat sealing was performed under the conditions of one-side heating temperature 210 ° C., heating time 0.5 seconds, cooling time 0.8 seconds, pressurization condition 0.2 MPa, seal width 15 mm (from the label end to 15 mm), Heat-welded.

  Thereafter, air was blown out from the cylinder, the cylinder was taken out with the label floating, and at the same time, a 500 mL round PET deformed bottle container was inserted, and the label was attached. Thereafter, the label was shrunk by heating at 95 ° C. for 10 seconds in a steam type shrink tunnel, and adhered 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 the label end portion was sufficiently sealed, and the appearance was good.

<Example 5>
After the label design is printed on the back side of a longitudinally uniaxially stretched polypropylene film (100 ° C x 10 seconds, 40% heat shrinkage in the flow direction) with a width of 900 mm and a film thickness of 30 µm, the heat sealant is applied so that the coating thickness becomes 5 µm (Main component: ethylene vinyl acetate resin, solid content: 45%, main solvent: water) was applied, and five rows of labels having a width of 175 mm were slit and wound around a paper tube. The obtained label was set on a labeler (roll sleeve labeler), and the label was fed out and cut into a length of 230 mm with a rotary cutter to obtain a single wafer label. The obtained label was sucked with air and wound around a cylinder (stainless steel air vacuum cylindrical cylinder) so as to coincide with the film flow, so that both ends of the label overlapped each other by 20 mm. Thereafter, an impulse seal was applied under the conditions of a heating time of 0.1 second, a cooling time of 0.1 second, a pressurizing condition of 0.1 MPa, and a seal width of 15 mm (from the label end to 15 mm), and heat-welded.

  Thereafter, air was blown out from the cylinder, and the label was lifted, and the cylinder was taken out. At the same time, a 500 mL round PET deformed bottle container was inserted from below, and the label was attached. Subsequently, the label was shrunk by heating at 90 ° C. for 10 seconds in a steam type shrink tunnel, and adhered 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 7.5 N / 15 mm, the label was sufficiently sealed to the end of the label, and the cosmetic appearance was excellent.

<Comparative Example 1>
Impulse sealing under the conditions that the heat sealant was not applied, the heating time was 0.8 seconds, the cooling time was 1.0 seconds, the pressure condition was 0.1 MPa, and the seal width was 15 mm (from the label end to 15 mm). The same operation as Example 1 was performed except having performed.

  The container with the roll shrink label thus obtained has a peel strength in the winding direction of 4.0 N / 15 mm without being peeled off even during heat shrinkage of the roll shrink label, and is sufficiently sealed to the end of the label. The appearance was also good. However, heating and cooling time took 1.5 seconds or more, and high-speed labeling suitability could not be obtained.

<Comparative example 2>
Impulse sealing under the conditions that the heat sealant was not applied, the heating time was 1.2 seconds, the cooling time was 1.5 seconds, the pressurizing condition was 0.1 MPa, and the seal width was 10 mm (from the label end to 10 mm). The same operation as Example 2 was performed except having performed.

  The seal part of the container with the roll shrink label obtained does not peel off even when the roll shrink label is heat-shrinked, and the label does not fall off even if the container with the label is dropped from a height of 50 cm. Strength was obtained. Although the peel strength in the winding direction was 4.5 N / 15 mm, the heating and cooling time took 1.5 seconds or more, and high-speed labeling suitability could not be obtained.

<Comparative Example 3>
The heat sealing agent was not applied, and the heating temperature was 210 ° C. on one side, the heating time was 1.5 seconds, the cooling time was 1.5 seconds, the pressurization condition was 0.2 MPa, and the seal width was 10 mm (from the label end to 10 mm). Under the conditions described above, the same operation as in Example 2 was performed except that one-side heat sealing was performed.

  The seal portion of the obtained container with a roll shrink label was burnt into a film and was in a temporarily attached state. The peel strength in the winding direction was 1.0 N / 15 mm or less, and only insufficient strength was obtained.

DESCRIPTION OF SYMBOLS 1 Original fabric roll 2 Longitudinal uniaxial stretching heat-shrink film 3 Shrink label 4 Heat seal agent 5 Start end part 6 End part 7 Cylinder 8 Overlapping part 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 a heat-sealing agent is applied to at least one of the front end surface and the backside of the terminating end portion of the longitudinally uniaxially stretched heat-shrinkable film, and is heat-sealed through the heat-sealing agent. Roll shrink label characterized by.   The roll shrink label according to claim 1, wherein the heat-welded portion is linear and perpendicular to the stretching direction of the heat-shrinkable film.   The roll shrink label according to claim 1 or 2, wherein design printing is applied to at least one of a front surface and a back surface other than the starting end portion and the terminal end portion.   The roll shrink label according to any one of claims 1 to 3, wherein the heating means in the heat welding is an impulse seal or a heat seal.   The said heat seal agent is an organic solvent type heat seal agent of vinyl chloride vinyl acetate copolymer system, ethylene vinyl acetate system, polyolefin system, ethylene acrylate system, polyacrylate system, or polyester system. A roll shrink label according to claim 1.   The roll shrink label according to any one of claims 1 to 4, wherein the heat sealant is a modified polyolefin 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 4, 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 -7.   The roll shrink label according to any one of claims 1 to 8, wherein a width of the portion to be thermally welded is 1 to 20 mm.   A container with a roll shrink label, wherein the roll shrink label according to any one of claims 1 to 9 is mounted and heat-treated. A transporting step for transporting the roll shrink label original fabric, a cutting step for cutting the roll shrink label original fabric into a predetermined length, and overlapping the start and end portions of the obtained shrink label A welding process for thermally welding, a mounting process for inserting a roll shrink label by inserting a container from the upper side or the lower side of the obtained roll shrink label, a heat shrinking process for thermally shrinking the mounted roll shrink label, In a method of manufacturing a container with a roll shrink label,
The roll shrink label original fabric is a longitudinally uniaxially stretched heat-shrink film, and before the welding step, a heat sealant is applied to at least one of the front end surface and the back end surface, and the thermal welding is performed. A method for producing a container with a roll shrink label, characterized in that the step is performed through a heat sealant.   The manufacturing method of the container with a roll shrink label of Claim 11 whose heating means in the said heat welding is an impulse seal | sticker or a heat seal.

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