JP5381085B2 - Wrapped shrink label, container with rolled shrink label, and method for producing them - Google Patents

Description

  The present invention relates to a wound shrink label that is wound around and mounted on the outer peripheral surface of a body portion of a container, a container with a shrink label around which the wound shrink label is wound, and more specifically, a wound shrink label is a heat-sensitive adhesive and a carbon dioxide laser. Therefore, the present invention relates to a container with a wound shrink label that can prevent the label bonding portion from opening even if the heat-sensitive adhesive is softened in the heat shrinking process, and a method for manufacturing the same.

  Plastic bottle containers such as polyethylene terephthalate are widely used in applications that contain soft drinks, liquid seasonings, cosmetics, etc. because they have excellent properties such as transparency, mechanical strength, and calorific value during combustion. A printed label is attached to the container for display purposes, or a shrink film or the like is used for light shielding purposes.

  As a method for attaching a label over the entire circumference to such a container, there is a method in which a label that has been bonded in a cylindrical shape is externally attached to the container (Patent Document 1). The label used in Patent Document 1 is attached to the outer peripheral surface of the bottle body using the self-stretching or self-recovering property of the film, and the outer peripheral surface of the bottle body constituting the bottle for filling soft drinks such as tea This is a stretch label that is attached to the bottle body and prevents the bottle body from falling off the outer peripheral surface. Adhesive is formed on the inner edge of the label, and corona discharge treatment is applied to the label surface edge to form a corona discharge treatment surface. Then, the adhesive and the corona discharge treatment surface are opposed to each other to form a joined portion, and the tubular stretch label is attached by being closely adhered to the outer peripheral surface of the bottle body.

  In addition, after the cylindrical label is externally fitted around the outer periphery of the container, heat treatment is performed to form a shrink, and a cylindrical shrink label that covers the surface continuously from the bottom of the mouth of the container to the bottom is externally fitted, and then heat shrink treatment There is a technique for performing (Patent Document 2). In Patent Document 2, a hot-melt adhesive is applied to both ends of the shrink label in advance, and the label is attached in a cylindrical shape via the hot-melt adhesive.

  Also, there is a method in which when a shrink label is bonded in a cylindrical shape, it is welded by laser light, and the obtained cylindrical shrink label is externally attached to a container (Patent Document 3). The label used in Patent Document 3 is a label formed in a cylindrical shape by superimposing both ends of a printed synthetic resin film and welding them by laser light irradiation. A surface layer laminated on both sides of the material, and the surface layer is made of a material having a melting point lower than that of the base material, and the welded surfaces of the both end portions are in a non-printed portion where no printing layer is applied. It is formed.

  Moreover, as a manufacturing method of a cylindrical shrink label, there is also a cylindrical shrink label formed by cutting a shrink label roll on which a detection mark is printed into a label length, and then forming it into a cylindrical shape (Patent Document 4). Detection marks are printed on a long heat-shrinkable film substrate at predetermined intervals, and label detection is performed by detecting the detection marks with a sensor. By printing with heat erasable ink, the detection mark can be made inconspicuous without going through a special heating process, and it can interfere with the predetermined display such as the design on each label and film. It can be prevented. In patent document 4, in order to adhere | attach the both ends of the heat shrink direction of a heat shrink film, and to shape | mold in a cylinder shape, after cutting | disconnecting a heat shrink film, a cutting label is rotated 90 degree | times and the both ends of a label are adhere | attached on a cylinder shape. Yes.

On the other hand, instead of the method of externally fitting a cylindrical label to a container, the label is adhered to the container end via an adhesive, and the other end is attached to the container via an adhesive after the remaining label is wound around the container. There is also a technique of fixing (Patent Document 5). Simply attach the adhesive to the back side of the label, attach it to the peripheral surface of the container in order from the start end side of the label, and stack the end of the label on the start end, making it difficult to peel off the label after use, Also, if an adhesive with weak adhesive strength is used to enhance the peelability of the label, the overlapping part of the label may be inadvertently peeled off during the product distribution process, etc. The method using a label is made in view of problems such as an expensive cylindrical label. The label described in Patent Document 5 has a hard-to-adhesive layer having adhesiveness to the adhesive before curing and a peelable property to the cured adhesive on the back surface of the label, and the adhesiveness to the hard-to-adhere layer is improved. It is a label for sticking both ends of the label in a state where the container adhesive layer is further laminated, the container adhesive layer is adhered to the peripheral surface of the container and the label back surface is temporarily adhered, and the label can be easily removed after use And so on.
JP 2003-205946 A JP 2006-117269 A JP 2000-141469 A JP 2003-43922 A JP 2000-242179 A

  However, a container formed by fitting a cylindrical label on the container intermittently performs the process of covering the label material, so that the operation rate decreases, or when the label material is covered, a shift occurs and the container is placed in a suitable location. The label may not be displayed correctly. In addition, when a cylindrical label is externally fitted, a predetermined rigidity is required for the label substrate, but it is desirable that a thinner film can be used for environmental protection.

  In addition, since the shrink label is thermally contracted in the stretching direction, the shrink label is attached to the container with the stretching direction and the body winding direction matched. Conventionally, a laterally uniaxially stretched film is used. For example, as shown in FIG. 3 of Patent Document 4, after cutting to a predetermined label length, the cut label is rotated 90 degrees and then formed into a cylindrical shape. A cylindrical label was mounted vertically from the top. 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. Therefore, it is convenient if the shrink label can be directly attached to the container without forming a cylindrical label in advance.

  On the other hand, as a method of sticking a shrink label directly to a container, an adhesive method using a cold glue adhesive such as casein glue or an adhesive label is a method of sticking to a glass bottle such as a beer bottle, and sticking out or floating of the glue appears. Since the adhesion time is easy, productivity decreases. In addition, there is a method using an adhesive label, but the cost increases due to the use of release paper. Further, the label described in Patent Document 5 has a complicated layer structure. Furthermore, in the method of bonding a container and a shrink label with a hot-melt adhesive, when the container is in a high temperature condition after bonding, the hot-melt adhesive may melt and the label overlap portion may be peeled off. In particular, when the contents of the container are heated products, the hot melt adhesive may melt during transfer or within the sales period depending on the storage temperature of the contents. In some cases, the hot-melt adhesive may melt out.

  Moreover, although the label edge part of patent document 3 welds the label edge part with a laser beam, in order to ensure the adhesiveness with a laser, the layer structure of the label to be used may become complicated. Laser light is also used for cutting a resin and the like. Since the irradiation range is narrow, the laser welding width is narrow and the welding strength may be inferior. For this reason, even if a transparent PET film is irradiated with semiconductor laser light, the laser light is transmitted through the film and the film cannot be welded.

  In addition, when shrink processing is performed after the wound shrink label is attached to the container, the outermost end portion of the overlapping portion of the wound shrink label may be warped outward by heating, and the appearance may be impaired.

In view of such a current situation, an object is to provide a wound shrink label that does not come off even when a container is heated.
Another object of the present invention is to provide a wound shrink label that can be easily attached to a container.

  In addition, the present invention provides a wound shrink label that can be attached to a container with conspicuous unevenness, can satisfy the diversification of the container shape, and satisfy the consumer's desire to purchase, and has an excellent heat shrinkage rate.

The present invention also provides a container equipped with such a wound shrink label.
Furthermore, this invention provides the manufacturing method of the container equipped with the winding shrink label which is excellent in production efficiency rapidly by a simple process.

  As a result of examining the shrink label in detail, the present inventor has found that when a wound shrink label is used instead of the cylindrical shrink label, it can be easily attached to a container even if the label thickness is thin, and the heat shrinkage rate as a base material for the shrink label If a rolled shrink label is manufactured using a longitudinally uniaxially stretched film that is superior to the above, the stretching direction and the transport direction can be made the same direction, so the film is cut into a predetermined label length and then the cut end is interposed with a heat-sensitive adhesive layer It can be adhered to the container, the step of rotating the label 90 degrees can be omitted, the other end of the label is fixed to the container via a heat-sensitive heat-sensitive adhesive, and then the label overlap portion is welded with a carbon dioxide laser beam. Even when the heat-sensitive adhesive melts, the label can be prevented from peeling off, and the end of the overlapped portion can be prevented from being warped. The carbon dioxide laser is irradiated defocused label overlapping portion can be stably wider by welding, it found that can produce a wound shrink label having excellent adhesive strength, thereby completing the present invention.

That is, the present invention is a wound shrink label that is directly attached to the outer peripheral surface of the body of the container,
A heat-shrinkable base film stretched uniaxially is cut into a predetermined size in the stretching direction to form a label piece, a heat-sensitive adhesive is formed at the label start end of the label piece, and a laser is applied to the label end of the label piece. A heat-sensitive adhesive is formed on a part of the laser light absorber layer so that a light absorber layer and a heat-sensitive adhesive are formed, and a portion where the laser light absorber layer is the innermost layer is formed. A feature of a wound shrink label is provided.
The present invention is also a wound shrink label that is directly affixed to the outer peripheral surface of the body of the container, wherein the heat-shrinkable base film that has been longitudinally uniaxially stretched is cut into a predetermined size in the stretching direction to form a label piece, A heat-sensitive adhesive is formed on the label start end of the piece, a laser light absorber layer and a laser reflection layer are laminated in this order on the label end of the label piece, and a heat-sensitive adhesive is formed on the laser reflection layer. The present invention provides a wound shrink label, characterized in that a heat-sensitive adhesive is formed on a part of the laser reflection layer so that a portion where the laser reflection layer is the innermost layer is formed. .

  Further, the present invention provides the wound shrink label, wherein the label terminal portion is formed with a portion where the laser light absorbent layer becomes the innermost layer at an end portion of the label piece.

The present invention also provides the wound shrink label, wherein the laser light absorber layer is made of a pearl pigment .

Moreover, this invention provides the said roll shrink label whose said laser reflection layer is an aluminum vapor deposition layer or the printing layer of aluminum containing ink.
In the present invention, the heat-shrinkable base film is a polyolefin-based film, a polyester-based film, a polystyrene-based film, a polylactic acid-based film, or a laminated film of two or more of these films, The wound shrink label having a shrinkage rate of 5 to 85% at a temperature of 100 ° C. is provided.

  The present invention also provides the wound shrink label, wherein the polyolefin film is a vertically uniaxially stretched polypropylene film, and the polyester film is a vertically uniaxially stretched polyethylene terephthalate film.

  Moreover, this invention provides the said winding shrink label characterized by having a design printing layer in the label innermost layer or outermost layer of the said heat-shrinkable base film.

The present invention also provides the wound shrink label, wherein one or more perforation rows are formed at the end of the label.
Moreover, this invention provides the said roll shrink label whose said heat sensitive adhesive is a hot-melt agent.

Moreover, this invention provides the said roll shrink label whose said container is a polyethylene terephthalate bottle.
Moreover, this invention provides the container with a winding shrink label formed by sticking the said winding shrink label to a container.

  Further, the present invention provides a label start end portion of the wound shrink label bonded to a container via a heat-sensitive adhesive, winds the wound shrink label around the container, and affixes the label end portion. A method for producing a container with a wound shrink label, characterized in that the label is fixed to the container by irradiating a carbon dioxide laser from the surface of the overlapping portion of the film which is on the surface side and not coated with the heat-sensitive adhesive Is to provide.

  Moreover, this invention provides the manufacturing method of the said container with a winding shrink label including the process of heating at the temperature of 60-230 degreeC and heat shrinking the said shrink shrink label after the process of fixing the said label. .

  Moreover, this invention provides the manufacturing method of the said container with a winding shrink label which performs irradiation of the said carbon dioxide laser beam by defocusing.

  Since the wound shrink label of the present invention can be wound around and mounted on a container, the process of forming the label into a cylindrical shape is not required, the production process can be simplified, and the cost can be reduced.

  Moreover, since the winding shrink label of this invention has high adhesive stability, a winding shrink label can be affixed on a container at high speed, and production efficiency can be improved. In addition, since a conventional hot-melt adhesive can be used, it can be manufactured at low cost.

  In addition, the container with the wound shrink label of the present invention is fixed at high heat resistance by laser fusion even when the heat-sensitive adhesive melts in a high temperature atmosphere, so that it can be handled during storage and transportation. Convenient. In particular, there is no peeling due to melting of the adhesive even under high temperature conditions, and it can be suitably used for containers for warmed products.

  Moreover, according to the manufacturing method of the container with the winding shrink label of the present invention, since the heat-sensitive adhesive is formed inside the winding shrink label in the manufacturing process, it is not necessary to use release paper, and the winding shrink label is efficiently attached. Containers can be manufactured.

  In the container with a wound shrink label of the present invention, since the end of the label overlap portion is welded by laser light, the endmost portion does not warp after shrink processing, and is excellent in design.

  The container with a wound shrink label of the present invention is excellent in production efficiency because it can be welded in a short time because it irradiates a carbon dioxide laser beam and fixes the label overlapping portion. In addition, unlike a semiconductor laser beam or the like, there is no need to pressurize the welded part at the time of welding, so that a container with a wound shrink label can be manufactured more efficiently.

  The first of the present invention is a wound shrink label that is directly attached to the outer peripheral surface of the body part of the container, and the heat-shrinkable base film that has been longitudinally uniaxially stretched is cut into a predetermined size in the stretching direction to form a label piece, A heat-sensitive adhesive is formed at the label start end of the label piece, a laser light absorbent layer and a heat-sensitive adhesive are formed at the label end of the label piece, and the laser light absorbent layer is the innermost layer. A wound shrink label, wherein a heat-sensitive adhesive is formed on a part of the laser light absorber layer so that is formed. The label terminal portion is preferably formed with a portion where the laser light absorber layer is the innermost layer at the outermost portion of the label piece, and the laser light absorber layer is preferably made of a pearl pigment. Furthermore, the label termination part may have a laser reflection layer outside the laser light absorber layer. The wound shrink label may have a design printing layer on the innermost label or outermost layer of the heat-shrinkable base film, and at least one perforation for peeling off the label at the end of the label. A row may be formed. Hereinafter, the wound shrink label, the container with the wound shrink label, and the method for producing the wound shrink label of the present invention will be described.

(1) Configuration of the wound shrink label The wound shrink label of the present invention is a wound shrink label that is directly attached to the outer peripheral surface of the body of the container, and the heat-shrinkable base film stretched in the longitudinal direction is cut into a predetermined size in the stretching direction. A label piece is formed, the label start end portion of the label piece is composed of the heat-shrinkable base film and a heat-sensitive adhesive, and the label end portion is the heat-shrinkable base film and the laser light absorber layer. It consists of a heat sensitive adhesive.

  FIG. 1 shows a preferred embodiment of the wound shrink label of the present invention. The left side of the drawing is the label start end, and the right is the label end. In the wound shrink label of the present invention, a sticking portion (W) for attaching to a container is formed at a label start end portion and a label end portion of a label piece, and the attachment portion (W) of the label start end portion is heat-shrinkable. It consists of a heat-resistant base film (10) and a heat-sensitive adhesive (40), and the attached part (W) of the label end part is a heat-shrinkable base film (10), a laser light absorber layer (20), and heat-sensitive. It consists of an adhesive (40). At the end of the label, a heat-sensitive adhesive (40) is formed on a part of the laser light absorbent layer (20) so that the laser light absorbent layer (20) forms the innermost part (a). . When the laser is irradiated from the outside of the label (100), the portion (a) in which the laser light absorber layer (20) becomes the innermost layer is formed in order to contact the container through the laser light absorber layer (20). did. The portion (a) where such a laser light absorber layer (20) is the innermost layer is preferably the outermost portion of the label terminal portion as shown in FIG. By sticking the portion left stuck with the heat-sensitive adhesive (40) by laser welding, the protrusion of the heat-sensitive adhesive (40) and the protrusion of the label end can be suppressed.

Moreover, as shown in FIG. 2, the said label termination | terminus part may form a laser reflection layer (30) in the outer side of a laser beam absorber layer (20).
Moreover, as shown in FIG. 3, the label (100) may be one in which a design print layer (50) is formed between the sticking portions (W) at both ends. The design print layer (50) may be formed on the label surface of the heat-shrinkable base film (10) of the wound shrink label of FIG. At this time, if the design print layer (50) is formed at the label end portion, laser welding may not be sufficient even if the laser beam is irradiated. Therefore, the design print layer (50) should not be formed at the label end portion. Is preferred.

  Moreover, as shown in FIG. 4, the label (100) may further have an outer layer (60) on the label surface of the heat-shrinkable base film (10) of the wound shrink label of FIG. The heat-shrinkable base film (10) is not limited to a single layer and may be a laminated film having two or more layers.

  FIG. 5 shows the relationship between the adhesive (40) between the container (90) and the label (100), and the heat-sensitive adhesive (40) and the laser light absorber layer (20) in the overlapping portion between the labels (100). As shown in FIG. 5, the label (100) is bonded to the container (90) via a heat-sensitive adhesive (40) formed at the label start end, and after winding the container, the label (100) is passed through the heat-sensitive adhesive (40). Thus, the label start end and the label end end are bonded. When the laser beam (70) is irradiated from the outer peripheral side of the label (a) where the laser light absorber layer (20) is the innermost layer in the label terminal portion, the label terminal portion is passed through the laser light absorber layer (20). Is laser welded to the outside of the beginning of the label.

  In the present invention, the size of the wound shrink label can be appropriately selected according to the size of the container to be attached. Similarly, the size of the sticking part (W) to which the heat-sensitive adhesive (40) is applied can also be appropriately selected according to the usage mode of the label sticking device.

  In the present invention, a heat-sensitive adhesive is provided at least at the start and end of the wound shrink label, but the heat-sensitive adhesive is not limited to the start and end of the wound shrink label. Therefore, the above-mentioned heat-sensitive adhesive may be formed on the entire inner surface of the wound shrink label, or the heat-sensitive adhesive may be formed in a frame shape over the entire inner periphery of the wound shrink label. As shown in FIG. 7, in the case of a container in which the circumference of the body is not the same across the top and bottom of the container and there is a difference between the maximum circumference and the minimum circumference, the adhesion between the container and the label start end is shown in FIG. When the label is wound around the container and the label end portion is bonded to the start end portion, the label start end portion and the label end end portion are bonded at W3. For this reason, in the wound shrink label of the present invention, the shape of the heat-sensitive adhesive layer at the start and end portions of the wound shrink label need not be the same. In addition, in FIG. 8, the irradiation direction of the carbon dioxide gas laser after adhere | attaching with a heat sensitive adhesive is shown. As a result, the label overlapping portion after being bonded with the heat-sensitive adhesive is laser-welded.

  The wound shrink label of the present invention is not limited to an adherend. As long as it can be adhered by a heat-sensitive adhesive, it can be applied to containers made of various materials such as metals and synthetic resins, and its use is not limited. Therefore, soft drinks, seasonings, liquor (Japanese sake, barley liquor, sparkling liquor, wine, shochu, distilled liquor, etc.), cooking oil, cosmetic containers, toiletries, dehumidifier containers, detergent containers, ampoule bottles, energy drinks, eye drops It can be suitably used as a wound shrink label used for containers such as medicine containers, medicine containers, and desserts. Since the label is fixed by laser welding in addition to the heat-sensitive adhesive, it can be suitably used especially when the contents are heated.

One or more perforation lines may be formed in parallel with the laser welded portion of the overlapped portion. This is because it is easy to remove the label from the container after use.
(2) Heat-shrinkable base film The wound shrink label of the present invention uses a heat-shrinkable base film that has been longitudinally uniaxially stretched.

  As the heat-shrinkable base film, a polyolefin film, a polyester film, a polystyrene film, a polylactic acid film, and a laminate film of two or more of these films, which are longitudinally uniaxially stretched, are preferably used. can do. More preferably, the polyolefin film is a longitudinally uniaxially stretched polypropylene film, the polyester film is a longitudinally uniaxially stretched polyethylene terephthalate film, and a longitudinally uniaxially stretched film of a polyester-polystyrene coextruded film. Conventionally, although a longitudinally uniaxially stretched film exists, the longitudinally uniaxially stretched film has not been used as a shrink label. However, in this invention, it discovered that a manufacturing process could be simplified by using a longitudinally uniaxially stretched film, and decided to use it limiting especially to a longitudinally uniaxially stretched film.

  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.

  In the present invention, the thickness of the heat-shrinkable substrate 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, 15 to 50 μm. If it is within the above range, it is possible to ensure sufficient mechanical strength when mounted on a container and to be excellent in welding strength with a carbon dioxide laser beam. In particular, in the present invention, since the label end portions are welded with carbon dioxide laser light, it is not necessary to press and press the label overlapping portion to adhere them, and both can be fixed without contact. The label thickness is a layer thickness before heat shrinkage.

  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 are added to the heat-shrinkable base film as necessary. It may be. In addition, the surface of the heat-shrinkable base film may be subjected to conventional surface treatment such as corona discharge treatment, plasma treatment, flame treatment, and acid treatment in order to improve printability.

  In the present invention, as the heat-shrinkable base film, a film having a longitudinal heat shrinkage rate of 5 to 85%, more preferably 20 to 70% at a temperature of 100 ° C. can be suitably used. Since it has an excellent heat shrinkage rate, it can be suitably used for a container having a recess. In addition, the heat shrinkage rate in this invention is a heat shrinkage rate by 100 degreeC hot water, Comprising: The heat shrinkage rate of an extending | stretching direction shall follow a following formula. Therefore, in the case of a longitudinally uniaxially stretched film, the shrinkage direction is the film flow direction, and thus the thermal shrinkage rate with respect to the flow direction is 5 to 85%.

本発明の巻きシュリンクラベルのサイズは、貼付対象の容器のサイズに応じて適宜選択することができる。同様に、溶着部のサイズも、例えばラベル貼付装置の使用態様などに応じて適宜選択することができる。

The size of the wound shrink label of the present invention can be appropriately selected according to the size of the container to be attached. Similarly, the size of the welded portion can be appropriately selected according to, for example, the usage mode of the label sticking device.

  In the present invention, a commercially available film may be used as the heat-shrinkable substrate film. As such a film, a PET longitudinally uniaxially stretched film (heat shrinkage rate: 100 ° C., 10 seconds, 50%), a polypropylene longitudinally uniaxially stretched film (heat shrinkage rate: 80 ° C., 10 seconds; 10%, 100 ° C., 10% 25%), Polysack Plastic Industries Ltd. trade name "Polyphane FIT ST (Polyphane FIT ST)", etc., maximum shrinkage in longitudinal direction at 100 ° C 19%, 70 at 130 ° C % Uniaxially stretched polystyrene film, manufactured by Eclone Mobil Co., Ltd., trade name “Label-Lyte-Roll-On-Sink-on LR210”, longitudinal uniaxially stretched polypropylene film such as 18% maximum shrinkage in the longitudinal direction, longitudinally uniaxially stretched white A polypropylene film, a longitudinally uniaxially stretched PLA film, and the like can be suitably used.

  In the present invention, the “shrink label” is a label that can be shrunk by heat treatment. Therefore, it is a shrink label both before and after heat shrinkage.

(3) Heat-sensitive adhesive The heat-sensitive adhesive constituting the heat-sensitive adhesive layer is an adhesive that exhibits adhesiveness when heated. For example, a hot-melt adhesive, a part coat-type heat-sensitive adhesive, or the like is used. Can do. Conventionally known heat-sensitive adhesives for labels can be suitably used.

  Here, the hot-melt adhesive is an adhesive that is not adhesive at room temperature but can be bonded by heating and can be applied by heating and melting, for example, an ethylene-vinyl acetate copolymer. Examples thereof include those in which an additive such as a tackifier is blended with a base resin such as an ethylene resin such as styrene copolymer or ethylene acrylate copolymer, or a styrene-butadiene block copolymer.

  In addition, the part coat type heat-sensitive adhesive becomes adhesive by heating in the same manner as the hot melt type adhesive, and a heat adhesive resin such as ethylene-vinyl acetate copolymer and a tackifier are dissolved in an organic solvent or the like. The dispersed solution is an adhesive that can be applied by printing such as gravure coating, and is used after drying after coating.

  In the present invention, in particular, those having a melting point of 80 ° C. or higher, more preferably 90 ° C. or higher are preferred. This is because when the shrink label is subjected to shrink processing after being attached to the container, the melting point can suppress heat melting during the shrink processing. On the other hand, when the melting point exceeds 150 ° C., the heat-shrinkable base film is shrunk, and an excessive heating load is applied to the labeler, which is disadvantageous.

(4) Laser Light Absorber Layer In the wound shrink label of the present invention, a laser light absorber layer is laminated on the heat-shrinkable base film at the end of the label. By laminating the laser light absorber layer, the irradiation time can be shortened and the productivity can be improved. As shown in FIG. 5, the range where the label edges are overlapped from the outside so as to be heat-shrinkable base film (10) / laser light absorber layer (20) / heat-shrinkable base film (10) When (a) is irradiated with carbon dioxide laser light (70) from the outer periphery of the label terminal portion, the laser light (70) passes through the heat-shrinkable base film and reaches the laser light absorber layer (20). It absorbs the energy of the laser beam (70), softens the heat-shrinkable base film (10) at the end, and promotes welding with the lower heat-shrinkable base film (10).

  In the present invention, a pearl pigment is preferably used as the laser light absorber layer. Since carbon dioxide laser light is absorbed by a transparent film such as PET, it can be welded in particular in a short time, but it has been found that when a pearl pigment is blended in the laser light absorber layer, it is more stably welded. . Further, the blended portion of the pearl pigment can make the welded portion pearly, and is excellent in cosmetics. The pearl pigment is a fine powder of white mica having a particle size of 5 to 130, and may be a commercially available product. As such a pearl pigment, for example, “Laser Flare 800” manufactured by Merck & Co., Inc. can be used. When the laser light absorber layer is irradiated with a laser without using a pearl pigment, the laser light may pass through the label and damage a container such as a PET bottle. Such inconvenience can be avoided by using a pearl pigment.

  In the present invention, the laser light absorber layer can be composed of, for example, a composition comprising a resin having a Tg lower than the glass transition temperature (Tg) of the heat-shrinkable base film and a pearl pigment. Specifically, the total amount of the pearl pigment is preferably 3 to 80% by mass in the laser light absorber layer. Within this range, the film absorbs the laser more efficiently and obtains sufficient heat for bonding, whereby welding with higher strength and production efficiency can be performed.

  The laser light absorber layer is formed by printing or applying a composition comprising a pearl pigment and a resin having a Tg lower than that of the resin constituting the heat-shrinkable base film on the heat-shrinkable base film. be able to. Examples of the resin having a Tg lower than that of the resin constituting the heat-shrinkable base film include polyethylene and polyurethane.

  In addition, as a relationship between a laser beam absorber layer (20) and the irradiation position of a laser beam (70), for example, as shown in FIG. 6, the thermosensitive adhesive (40) is used as a label of the label piece. A heat-sensitive adhesive layer (40) is formed at two locations of the terminal portion, and the laser light absorbent layer (20) is the innermost layer between the heat-sensitive adhesive layer (40) and the heat-sensitive adhesive layer (40). The location (a) may be formed. Even in such an embodiment, the laser beam (70) is irradiated from the outer peripheral side of the label to the portion (a), and the label end portion is laser-exposed to the outside of the label start end portion through the laser beam absorbent layer (20). Can be welded.

(5) Laser Reflecting Layer In the present invention, it is preferable that the laser reflecting layer (30) is laminated on the laser light absorber layer (20) as shown in FIG. 2 at least at the terminal portion of the wound shrink label. . When the laser reflection layer (30) is provided, the temperature of the laser light absorber layer (20) can be raised more intensively and softened or melted and bonded, thereby reducing the laser irradiation amount. Can be glued.

  Such a laser reflection layer is preferably provided on the laser light absorber layer (20) at the end of the wound shrink label as shown in FIG. This is because the laser light is irradiated from the outside of the wound shrink label, so that it is most excellent in laser reflectance when it is provided in the innermost layer of the sticking part. In addition, it is not necessary to form over the whole region of the laser light absorber layer (20), and the laser light absorber layer (20) may be formed only on the portion (a) that becomes the innermost layer.

In the present invention, the laser reflecting layer (30) is preferably made of a metal such as iron, nickel, copper, aluminum, silver, or gold, and aluminum is particularly inexpensive and suitable.
When the metal is used as a foil as the laser reflecting layer (30), the adhesiveness between the wound shrink label and the container at the sticking portion may be reduced. Therefore, in the present invention, the laser reflecting layer is formed by, for example, aluminum vapor deposition or printing with an aluminum-containing ink. In the case of using a printed layer with aluminum vapor deposition or aluminum-containing ink, it was found that it was decomposed by laser light irradiation and laser welding could be suitably performed.

For example, aluminum vapor deposition is performed on the laser light absorber layer (20) by a reactive vapor deposition method under a vacuum of 10 ⁻¹ to 10 ⁻² Pa, typically by supplying oxygen into a vapor deposition tank using metal aluminum as a vapor deposition source. A layer can be formed.

On the other hand, a leaf-like aluminum paste-added silver ink or the like can be used as the aluminum-containing ink, and the laser reflective layer can be formed by printing.
(6) Design Print Layer The wound shrink label (100) of the present invention may have a design print layer (50) in the label innermost layer or outermost layer of the heat-shrinkable base film. However, as shown in FIG. 3, it is preferable that there are no printing layers (50) above and below the laser light absorber layer (20). This is because welding by carbon dioxide laser light may be hindered.

  There is no limitation in the printing method, for example, a printing layer can be formed by gravure printing. As the printing layer, one or more ordinary ink vehicles are prepared from a resin and a solvent, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, and a curing agent. 1 to 2 or more kinds of auxiliaries such as additives, crosslinking agents, lubricants, antistatic agents, fillers, etc. are optionally added, and further colorants such as dyes and pigments are added, and solvents, diluents, etc. The ink composition obtained by sufficiently kneading and adjusting the ink composition can be used.

  As such an ink vehicle, known ones such as sesame oil, drill oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic resin, Natural resin, hydrocarbon resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin , Melamine resin, amino alkyd resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, etc. can be used alone or in combination. The ink vehicle serves to carry the colorant from the plate to the substrate and fix it as a coating.

  Further, the drying property of the ink varies depending on the solvent. The main solvents used in printing inks are toluene, MEK, ethyl acetate, and IPA. Solvents with a low boiling point are used for quick drying. However, if the drying is too fast, the printed matter may be faded or printing may not be successful. Yes, a solvent having a high boiling point can be appropriately mixed. This makes it possible to print fine characters neatly. Colorants include dyes that are soluble in solvents and pigments that are insoluble in solvents, and gravure inks use pigments. Pigments are classified into inorganic pigments and organic pigments. Examples of inorganic pigments include titanium oxide (white), carbon black (black), and aluminum powder (gold and silver), and organic pigments are preferably azo. be able to.

  Although the above was demonstrated by gravure printing, printing systems, such as letterpress printing, screen printing, transfer printing, flexographic printing, etc., may be sufficient. The printing may be back printing or front printing.

(7) Outer layer As shown in FIG. 4, the wound shrink label of the present invention may further include an outer layer on the surface side of the heat-shrinkable base film. As such an outer layer, it can be appropriately selected depending on the use and design properties of the wound shrink label, and when giving the label surface slipperiness, OP varnish, when giving the tactile sensation when touching the label It is preferable to use a printing layer made of suede ink and a mat OP for giving a mat feeling. The outer layer can be a laminate of two or more layers, and a design print layer may be formed on the outer layer.

(8) Surface Treatment In the present invention, prior to the formation of any layer of the wound shrink label, another layer may be formed or laminated after performing a surface treatment in advance. Such surface treatments include corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, etc., and other pretreatments, etc. is there. In addition, as such a surface treatment, a primer coating agent, an undercoat agent, an anchor coating agent, an adhesive, an evaporation anchor coating agent, or the like may be arbitrarily applied to perform the surface treatment.

(9) The container can attach the winding shrink label of the container present invention, a glass container, synthetic resin containers such as PET; inorganic container such as a ceramic bottle; aluminum, iron, metal container, such as SUS; glass, synthetic It can be suitably mounted on a container made of a composite material including resin, ceramic, metal, paper and the like.

  On the other hand, when the container is a synthetic resin container, it is lightweight and mechanical to use a polyester resin such as PET and a polyolefin resin such as PP as the thermoplastic resin layer constituting the container. It is preferable because it is excellent in strength, heat resistance, gas barrier properties, chemical resistance, aroma retention, hygiene and the like. The container can be manufactured by injection molding, vacuum forming, pressure forming, or the like of polyester resin or polyolefin resin.

  As the shape of the container, the cross section of the container to which the wound shrink label is attached is not limited to a round shape, but may be a polygonal shape such as a square or an octagon. In addition, the container body portion to which the wound shrink label is attached is not limited to the case where it has the same diameter throughout the entire length of the body portion. May be. Rather, in the present invention, since a longitudinally uniaxially stretched film having an excellent heat shrinkage rate is used, even if the container has an uneven shape, it can be suitably mounted. Therefore, as shown in FIG. 7, the minimum peripheral diameter (minimum peripheral diameter × 100 / maximum peripheral diameter (%)) with respect to the maximum peripheral diameter of the wound shrink label mounting portion of the container is 50 to 100%, more preferably 70 to 90. %, Particularly preferably 75 to 85% can be suitably used.

FIG. 9 shows a container with a wound shrink label after the wound shrink label of the present invention is attached to the container of FIG.
(10) Manufacturing method of winding shrink label The label used by this invention can be prepared by using a longitudinally uniaxially stretched film and forming a design printing layer, a laser-light absorber layer, and a heat-sensitive adhesive layer suitably. At this time, the heat-shrinkable base film stretched uniaxially is cut into a predetermined size in the stretching direction to form a label piece, a heat-sensitive adhesive is formed on the label start end of the label piece, and the label end of the label piece A laser light absorber layer and a heat-sensitive adhesive can be formed on the part. Further, a laser light absorber layer is formed in advance at a position to be a label end portion of the heat-shrinkable base film, and this heat-shrinkable base film is cut into a predetermined size in the stretching direction to form a label piece, Even if a heat-sensitive adhesive is formed on each of the label start end and label end of the label piece, it can be manufactured.

Furthermore, the wound shrink label of the present invention may be prepared as necessary by applying a laser light absorbent layer or a heat-sensitive adhesive when the container is mounted.
(11) Manufacturing method of container with winding shrink label As an apparatus for manufacturing a container with winding shrink label in the present invention, a conventional labeler provided with a laser irradiation device and a shrink tunnel can be suitably used. More preferably, a roll shrink label original roll which does not form a heat sensitive adhesive inside the wound shrink label is used, a heat sensitive adhesive (40) is applied after the label is cut, and then the label is attached to the container. It is preferable. Thereby, a release paper can be made unnecessary. A conventionally well-known apparatus can be used as such an apparatus. FIG. 10 shows a method for manufacturing a container with a wound shrink label using a labeling device.

  The label sticking device shown in FIG. 10 has a raw roll (110) supply unit, a label cutting device (150), a transfer drum (160), and a container supply unit (220) in addition to the sticking drum and applicator. Further, a carbon dioxide laser (240) and a heat shrink device (250) are provided.

  The raw roll (110) supply section includes a tape roll (110) and a roll roll (110) in which a laser light absorbent layer is formed at the end of the label of the heat-shrinkable base film stretched uniaxially. A plurality of tension rollers (130) for winding the tape (120) drawn from the tape and a drawing device (140) are provided, and the tape (120) drawn from the original roll (110) is provided with the tension roller. The tension is kept constant by (130), and is further passed through a drawing device (140) composed of a pair of rollers, and continuously supplied to a cutting device (150) for cutting the tape (120) with a predetermined dimension. Is done.

  Next, the tape (120) is cut into a predetermined size by a cutting device (150) to produce a label piece (170). In the present invention, the tape (120) supplied from the raw fabric roll (110) is a heat-shrinkable base film stretched in a uniaxial direction, and the film transport direction and the stretching direction are the same direction. A label piece can be formed simply by cutting to a predetermined size. That is, since the film can be cut and the label-container can be fixed only by moving the film in the horizontal direction, the step of rotating the label by 90 degrees as in the case of using a laterally uniaxially stretched film becomes unnecessary.

  In this apparatus, a negative pressure suction type transfer drum (160) and an adhering drum (180) are rotatably disposed adjacent to a cutting device (150), and the label piece (170) is provided as a transfer drum. The label piece (170) is adsorbed on the peripheral surface of (160) and designed so that the negative pressure on the peripheral surface is cut off when closest to the adhesive drum (180), and the label piece (170) is transferred to the adhesive drum (180). The sticking drum (180) is also of a negative pressure suction type, and the surface side of the label piece (170) extends from the label receiving point by the transfer drum (160) to the label sticking point to the container (190). , Ie, the label piece (170) is transferred while facing outward.

  In the vicinity of the sticking drum (180), an applicator (200) for forming a heat-sensitive adhesive (40) on the inner side of the label piece (170) is provided. The applicator (200) is a heat sensitive adhesive roll (201) capable of supplying a heat sensitive adhesive to the roll surface. The heat-sensitive adhesive roll (201) may be a direct roll or a gravure roll.

  When the adhesive on the surface of the heat-sensitive adhesive roll (201) is brought into contact with the inside of the label piece (170) transferred by the sticking drum (180), heat-sensitive adhesion is applied to the start and end portions of the label piece (170). An agent is formed. Thereby, the wound shrink label (100) shown in FIG. 1 is manufactured.

  The heat-sensitive adhesive roll (201) of this apparatus has a built-in heating mechanism, and the heat-sensitive adhesive heated to a predetermined temperature can be applied to the label piece (170). The label piece (170) on which the heat-sensitive adhesive is formed is transferred toward the sticking point of the container (190) by the rotation of the sticking drum (180). The transfer device (220) of the container (190) indicated by the arrow is adjacent to the sticking drum (180), and the container is transported in the tangential direction of the sticking drum (180).

  The transport device (220) is configured to forcibly rotate the container (190) at the time of label sticking, and when the container (190) reaches the sticking point, the start end sticking part of the label piece (170) and The container (190) is contacted and adhered. The container (190) is forcibly rotated by this adhesion, and the remaining portion of the label piece (170) is wound around the outer periphery of the container (190) by the rotation of the container. The innermost layer of the label piece (170) of the part is adhered.

  More specifically, the container (190) is transferred by the transport device (220) so that the start end sticking portion of the label piece (170) transferred by the sticking drum (180) and the container (190) can be bonded. The Due to the contact pressure between the two, the sticking end portion of the label piece (170) and the container (190) are bonded. The transport device (220) has a rotation mechanism (not shown) so that the container (190) rotates in synchronization with the sticking drum (180), and the start end sticking part of the label piece (170) and the container (190). , The container (190) is rotated in synchronization with the sticking drum (180) by the rotating mechanism, and the remaining part of the label piece (170) can be wound around the outer periphery of the container (190). Since the remaining part of the label piece (170) is sucked by the sticking drum (180), the label remaining part can be wound around a predetermined position. Next, the label surface of the start sticking part is bonded via the heat sensitive adhesive of the terminal sticking part.

  When the label piece (170) is contacted and bonded to the container (190), the label piece (170) is pressed from the surface side of the label piece (170) toward the sticking drum (180). If a part of (170) can be bonded, the wound shrink label can be bonded, wound and fixed via an adhesive regardless of its shape.

  Next, when the winding and fixing of the label piece (170) by the sticking drum (180) is completed, the labeled container (230) is transferred to the carbon dioxide laser (240) by the transport device (220). When the labeled container (230) is irradiated with the carbon dioxide laser in the carbon dioxide laser (240), the label endmost portion of the overlapping portion of the label end portion and the label start end portion fixed by the heat-sensitive adhesive is obtained. Fixed by laser welding.

  More specifically, as shown in FIG. 8, carbon dioxide laser light is irradiated and welded from the outside of the label overlap portion to form a laser weld portion having a width of 0.5 to 10 mm. In general, the overlapping portion has a width of 3 to 30 mm.

  In the present invention, since the label start end and the label end end are fixed by the heat-sensitive adhesive, laser welding can be easily performed by irradiating laser light from the outside of the overlapped portion even when the container is cylindrical. be able to.

  The present invention is characterized in that it is welded by irradiation with carbon dioxide laser light. Carbon dioxide laser light has a wavelength of 10.6 μm and has a larger influence on the substance than a semiconductor laser or the like, and can produce a wound shrink label in a short time and in a non-contact manner. For example, a carbon dioxide laser beam is irradiated from the outside onto the overlapping portion that is wound around and fixed to the container (90).

  In the present invention, the irradiation with the carbon dioxide laser beam may be performed by just focusing or by defocusing. The term “defocus” in the present invention usually refers to irradiating a laser beam with a focus on a target portion when irradiating a carbon dioxide laser beam, but irradiating the laser beam without adjusting the focus. This refers to irradiating a laser beam over a wider range than when combining them. According to defocusing, the irradiation energy can be dispersed over a wide range and the energy density per unit area can be lowered. Therefore, the adhesive strength can be secured over a wide range at a high processing speed. In addition, since the irradiation energy is diluted, excessive melting of the label surface and the welded portion can be suppressed, and a wide range of uniform and stable welding can be performed. FIG. 11 schematically shows the relationship between the spot diameter and the output energy when the carbon dioxide laser is irradiated with high output and low output. As shown in FIG. 11A, when focus irradiation is performed at a high output, irradiation is performed in a narrow range, so that the peak height (Hfa) indicating the output energy is increased, and when the focus irradiation is performed, the label surface is greatly melted. It is cut without being welded, or the label surface is melted. In such a case, cutting and melting can be avoided if focus irradiation is performed at a low output as shown in FIG. 11 (b). However, since the welding width is narrow, the vicinity is irradiated with a carbon dioxide laser several times, and welding is performed. If the width is not widened, the rolled shrink label cannot be put to practical use. In the present invention, as shown in FIG. 11 (a), by performing defocus irradiation, the welding width is widened and the peak height (Hdfa) indicating the output energy is lowered to cut the label or melt the label surface. Avoid such things. When defocus irradiation is performed at a low output, the peak height (Hdfb) indicating the output energy is low, so that the label cannot be welded. The specified output of the carbon dioxide laser is determined by the apparatus used, and the irradiation width in the case of focus irradiation, that is, the welding range is also determined by the apparatus. Therefore, in the present invention, regardless of which apparatus is used, a welding width suitable for welding of the label overlapping portion is selected by defocusing and welding is performed. Although the degree of defocusing differs depending on the apparatus to be used, in general, the irradiation width in the case of focus irradiation is 0.1 to 1 mm. Therefore, it is converted into the irradiation width of the laser light and is relative to the width in the case of focus irradiation. The width when defocused irradiation (width when defocused irradiation / width when focused irradiation) is preferably twice or more. In general, since the irradiation width in the case of focus irradiation is 0.1 to 1 mm, a welding width exceeding 1 mm is generally defocused irradiation.

  When the wound shrink label of the present invention forms one or more perforation lines parallel to the laser welded portion, for example, without defocusing the carbon dioxide laser beam, the wound shrink label is parallel to the laser welded portion. And then irradiate.

  The container (90) to which the label (100) is fixed by the carbon dioxide laser (240) is transferred to the heating / shrinking device (250) and the heating / shrinking device (250), and hot air at a predetermined temperature, for example, 60 to 220 ° C., Steam heated by steam of 80 ° C. or lower and steam from which water vapor has condensed, or radiant heat such as infrared rays are applied. In this invention, it is preferable to heat-process with a 80 degrees C or less steam. As a result, it is possible to manufacture a container in which the wound shrink label is highly shrunk in the circumferential direction while suppressing the melting of the heat-sensitive adhesive, and the body of the container is covered with the wound shrink label.

(12) Container with wound shrink label The container with wound shrink label of the present invention may be one in which the wound shrink label (100) is mounted so as to cover the entire length of the container (90). It may be attached to only a part of the container such as only the upper part, only the lower part, only the lid part. Further, the entire surface of the container can be covered by heat shrinking so as to wrap the container bottom or by attaching a shrink label to the entire bottom from the container lid and heat shrinking.

EXAMPLES Next, although an Example is given and this invention is demonstrated concretely, these Examples do not restrict | limit this invention at all.

Example 1
A 40 μm thick uniaxially stretched polypropylene film (heat shrinkage rate: 100 ° C., 10 seconds, 50%) was cut into a vertical pitch of 238 mm × width of 160 mm to prepare a label piece, and a laser flare pigment made by Merck at the end of the label 800 / Inktech CLIOS medium (35/100 laser light absorber layer was part-coated to a thickness of 40 μm. Next, soft hot melt (labeled by Toyo Adle: label) Melt BL-8603C) was applied to a thickness of 20 μm at a temperature of 135 ° C. using a melt gun (manufactured by Nordson: Mini-Squart), and the label start end was adhered to a 500 mL horizontal rib-shaped round deformed PET bottle shown in FIG. The label was then wound around a container and the label end was adhered onto the label start. The layer structure leading to the label start end is a container, a heat-sensitive adhesive layer, a longitudinal uniaxially stretched polypropylene film, a heat-sensitive adhesive layer, a laser light absorber layer, and a longitudinal uniaxially stretched polypropylene film. A portion (a) in which the laser light absorber layer shown in FIG. 1 is the innermost layer was formed with a width of 2 mm from the endmost portion of the label.

Next, the portion (a) was irradiated with a spot-like low-power carbon dioxide laser beam scanned from the outside of the label overlap portion in a line shape under the following conditions by a galvano scanning method.
(Laser condition)
Laser apparatus: KEYENCE CO ₂ laser marker (maximum output 30 W), laser wavelength: 10.6 μm, scan speed: 1500 mm / sec. Laser output: low output condition 22.5 W, focal length: just focus (WD 302 mm), number of welding lines / line interval: 2 lines, 0.2 mm interval.

Thereafter, the label was heated and shrunk through a steam type shrink tunnel under the following conditions.
(Shrink condition)
Apparatus: Steam type shrink tunnel, heating time: about 7 seconds, shrink temperature: low temperature condition (about 80 ° C. or less).

Regarding the obtained container, the possibility of welding with a CO ₂ laser, the welding strength (shearing / peeling, pulling speed 300 mm / min), the presence or absence of a laser mark on the PET bottle, and observation of the weld partial cross section (observation of substrate surface damage) are observed. did.

(result)
The resulting container does not peel off the adhesive part even during heat shrinkage, and does not drop off when the labeled container is dropped from a height of 50 cm. The welded part has sufficient adhesive strength (shear strength 5.8 N / 15 mm width). , Peel strength 2.0 N / 15 mm width) was obtained.

Also, the appearance after heat shrinkage was good.
Further, the label was peeled off by hand, and it was confirmed that the surface of the PET bottle was not damaged by carbon dioxide laser absorption marks. Furthermore, the cross section of the laser bonding part was observed, and it was confirmed that there was almost no label substrate surface roughness and both label end portions were welded.

A cross section of the label overlap portion is shown in FIG.

(Example 2)
A container with a shrink label was produced in the same manner as in Example 1 except that the shrink temperature was changed to 95 ° C.

(result)
There was no perforation or peeling at the welded part. Also, the appearance after heat shrinkage was good.

Furthermore, even when the labeled container was dropped from a height of 50 cm, the label did not fall off.

(Comparative Example 1)
Implemented except that medium ink (trade name “CLIOS”, manufactured by Inktec) was used in place of the laser light absorber layer of Example 1 and a white (CLIOS 950) design layer was formed on the pearl ink. In the same manner as in Example 1, a container with a shrink label was produced.

(result)
As a result of setting the printing specifications of the laser welded portion as follows, welding was impossible with a carbon dioxide gas laser.

(Comparative Example 2)
A container with a shrink label was produced in the same manner as in Example 1 except that the laser light absorber layer was not formed.

(result)
The laser output capable of welding was a high output of 27 W, and the surface of the welded portion was rough. Furthermore, whitening damage due to laser absorption marks occurred on the surface of the PET bottle.

A cross section of the label overlap portion is shown in FIG.

(Example 3)
Instead of the longitudinally uniaxially stretched polypropylene film of Example 1 (heat shrinkage rate: 100 ° C., 10 seconds, 50%), a polyester longitudinal uniaxial film having a film thickness of 50 μm (heat shrinkage rate: 100 ° C., 10 seconds, 50%) , Tg81 ° C.), and a laser light absorber layer in which a pearl pigment (trade name “Laser Flare 800”, manufactured by Merck & Co., Inc.) is blended at a ratio of 1: 1 as a laser light absorption layer is 8 g / m ^2. Printing, using laser light irradiation conditions, DIAMOND K-250 (output 250W, 100Hz, wavelength 10.6μ) manufactured by Coherent, under conditions of pulse interval 500μs, pulse width 19μs, processing speed 12m / min, A container with a shrink label was manufactured in the same manner as in Example 1 except that the laser beam was irradiated while shifting the focal length so that the welding line width was about 2 mm.

(result)
There was no perforation or peeling at the welded part. Also, the appearance after heat shrinkage was good.

  Furthermore, even when the labeled container was dropped from a height of 50 cm, the label did not fall off.

  The wound shrink label according to the present invention is such that the end of the overlapped portion is welded with a carbon dioxide laser beam, and the label can be fixed by laser welding even under temperature conditions in which the heat-sensitive adhesive melts with high productivity. It can be suitably used for products and is useful.

FIG. 1 is a cross-sectional view for explaining the layer structure of a wound shrink label according to the present invention, in which a sticking portion (W) for attaching to a container is formed on a label start end portion and a label end portion of a label piece, The attached part (W) of the label start end part is composed of a heat-shrinkable base film (10) and a heat-sensitive adhesive (40), and the attached part (W) of the label end part is a heat-shrinkable base film ( 10), a laser light absorber layer (20), and a heat-sensitive adhesive (40), and at the end of the label, the laser light absorber layer (20) so that the laser light absorber layer (20) is the innermost layer. It is a figure which shows the aspect by which a thermosensitive adhesive (40) is formed in a part of (). FIG. 2 is a view showing a mode in which the laser reflecting layer (30) is formed outside the laser light absorbent layer (20) at the end of the label in the wound shrink label of the present invention shown in FIG. FIG. 3 shows an aspect in which the design print layer (50) is formed between the sticking portions (W) at both ends in the wound shrink label of the present invention shown in FIG. FIG. 4 shows a mode in which the wound shrink label of the present invention shown in FIG. 3 further has an outer layer (60). FIG. 5 is a diagram illustrating the adhesion between the container (90) and the label (100) and the relationship between the heat-sensitive adhesive (40) and the laser light absorber layer (20) in the overlapping portion between the labels (100). is there. FIG. 6 is a diagram for explaining the relationship between the heat-sensitive adhesive (40) and the laser light absorber layer (20) at the overlapping portion between the label (100) and the adhesion between the container (90) and the label (100). It is a figure which shows the aspect in which a thermosensitive adhesive (40) is formed in several places in a label terminal part. FIG. 7 shows a container that can be used in the present invention, wherein the minimum peripheral diameter (minimum peripheral diameter × 100 / maximum peripheral diameter (%)) with respect to the maximum peripheral diameter in the label welded portion of the trunk is 50 to 100%. It is a figure explaining what has a recessed part. FIG. 8 is a view for explaining an attachment portion with the container in the wound shrink label of the present invention. FIG. 9 is a view for explaining a container equipped with the wound shrink label of the present invention. FIG. 10 is a diagram for explaining a manufacturing process of a container equipped with the wound shrink label of the present invention. It is a figure explaining the relationship between output energy and the welding width in the case of defocusing and focus irradiation. FIG. 3 is a cross-sectional view of a laser welding portion of a wound shrink label manufactured in Example 1. It is a cut sectional view of a laser welding part of a winding shrink label manufactured in comparative example 2.

Explanation of symbols

10 ... heat-shrinkable substrate film,
20 ... Laser light absorber layer,
30 ... Laser light reflecting layer,
40 ... heat-sensitive adhesive layer,
50 ... design printing layer,
60 ... outer layer,
90 ... container,
100 ... roll shrink label,
W, W1, W2, W3 ... pasting part,
110 ... Original fabric roll,
120 ... tape,
130: Tension roller,
140 ... drawer device,
150 ... label cutting device,
160 ... transfer drum,
170 ... label,
180 ... sticking drum,
190 ... container,
200 ... applicator,
201, 203 ... adhesive roll,
205 ... Auxiliary roll,
210 ... scrapper,
220 ... Conveying device,
230 ... Container with label,
240 ... UV irradiation device,
250: Heat shrinkage device.

Claims (8)

A wound shrink label that is directly attached to the outer peripheral surface of the body of the container,
A heat-shrinkable base film stretched in the longitudinal direction is cut into a predetermined size in the stretching direction to form a label piece,
A heat-sensitive adhesive is formed on the label start end of the label piece,
A laser light absorbent layer and a heat-sensitive adhesive are formed at the label end portion of the label piece, and a part of the laser light absorbent layer is formed on a part of the laser light absorbent layer so as to form the innermost layer. A wound shrink label, wherein a heat-sensitive adhesive is formed. A wound shrink label that is directly attached to the outer peripheral surface of the body of the container,
A heat-shrinkable base film stretched in the longitudinal direction is cut into a predetermined size in the stretching direction to form a label piece,
A heat-sensitive adhesive is formed on the label start end of the label piece,
A laser light absorber layer and a laser reflective layer are laminated in this order on the label terminal portion of the label piece, and a heat-sensitive adhesive is formed on the laser reflective layer,
A wound shrink label, wherein a heat-sensitive adhesive is formed on a part of the laser reflective layer so that a part where the laser reflective layer becomes the innermost layer is formed. The wound shrink label according to claim 1 or 2 , wherein the laser light absorber layer is made of a pearl pigment.   The wound shrink label according to any one of claims 1 to 3, wherein at least one perforation line is formed at the end of the label.   The wound shrink label according to any one of claims 1 to 4, wherein the heat-sensitive adhesive is a hot melt agent.   The wound shrink label according to any one of claims 1 to 5, wherein the container is a polyethylene terephthalate bottle.   A container with a wound shrink label formed by attaching the wound shrink label according to claim 1 to a container. Adhering the label start end of the wound shrink label according to any one of claims 1 to 6 to a container via a heat sensitive adhesive,
Wrap the wound shrink label around the container, and affix the label end portion,
A wound shrink label, characterized in that the label is fixed to a container by irradiating a carbon dioxide laser from the surface of the overlapping portion of the film on the surface side of the label end portion to which the heat-sensitive adhesive is not applied. A manufacturing method of a container with attached.

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