JPH0543182U - Easy peeling label - Google Patents

Abstract

(57) [Summary] [Purpose] A label that can be peeled off very easily from bottles, cans, etc. [Constitution] It has at least a heat-stretchable sheet and an adhesive layer. In addition to these, a laminated sheet of paper or plastic may be used. As the heat stretchable sheet, shape memory resin, shape memory alloy, shrink film or the like can be used. Further, if the expansion / contraction temperature of the heat-stretchable sheet is set to 100 ° C. or lower and the adhesive is made water-soluble, the sheet is easily peeled off only by immersing the bottle in hot water, and the adhesive layer is also removed. Will be able to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to labels attached to bottles and cans, which are containers for beer, soft drinks, etc., and in particular, to reuse those bottles and cans as they are, peeling after collection is easy. Regarding labels that can be done.

[0002]

[Prior Art]

 When recycling containers such as bottles and cans for reuse in their original form (that is, without melting and re-molding), it is necessary to cleanly remove the previously attached label. Since bottles and the like are distributed under various environmental conditions, the label is usually firmly adhered to the bottle and the like with an adhesive so that the label does not peel off in any distribution process. For this reason, it is not easy to peel off the already attached label and cleanly remove the adhesive used for attaching the label from the surface of the bottle or the like.

Conventionally, a bottle or the like is soaked in a heated caustic soda solution for a predetermined time to soften the label and the adhesive, and then high pressure water is sprayed from the tangential direction on the outer peripheral surface of the bottle or the like to label the label. The label was peeled off one by one by turning up the edge and rotating the bottle etc. from that state.

However, even if the label is peeled off by this, most of the adhesive used for attaching the label to the bottle or the like still adheres to the bottle or the like. Therefore, after that, such an adhesive layer was mechanically scraped off with a rubber roller or a brush.

[0005]

[Problems to be solved by the device]

 The mechanical label removing method as described above has a problem that it is difficult to adjust the force with which the rubber roller or the brush is pressed against the bottle. If this pressing force is too large, it may damage the bottle or deform the can. If the pressing force is too weak, the efficiency of removing the adhesive layer is poor and it takes a very long time to completely remove it.

Further, in the case of a bottle having a simple columnar shape, the label can be easily peeled off by high-pressure water simply by rotating the bottle, but in the case of a bottle having an irregular shape such as a square, There is also a problem that simple peeling cannot be performed. For this reason, it was traditionally difficult to send atypical bottles for recycling.

The present invention has been made to solve such problems, and the purpose thereof is that any shape of bottle or the like can be peeled off very easily. To provide a label.

[0008]

[Means for Solving the Problems]

 The easily peelable label according to the present invention made to solve the above problems is characterized by including at least a heat-expandable sheet.

Here, as the heat-expandable sheet, a sheet of shape memory resin or shape memory alloy, or a shrink film can be used.

As another configuration of the present invention, an adhesive layer may be provided in addition to the heat stretchable sheet.

[0011]

[Action]

 In the label of the first configuration, an adhesive is applied to one surface of the label immediately before the label is attached to the bottle, and the label is attached to the bottle. In the label having the second configuration, the adhesive layer provided on the label is used.

After the bottle or the like to which the label is attached has been collected, heat is applied to the label portion (or the entire bottle or the like). Then, the heat stretchable sheet constituting the label stretches and peels from the bottle or the like. If the stretching temperature of the heat-stretchable sheet is set to 100 ° C. or less, the label can be peeled off only by immersing the bottle in hot water (or by pouring or spraying the bottle on hot water). Therefore, the peeling work becomes extremely easy. At the same time, if the adhesive is made water-soluble (including the case where the adhesive chemically decomposes or deteriorates to dissolve or dissipate in water in addition to the case where it physically dissolves), The adhesive that adheres to bottles and the like will also be dissolved, making the adhesive removal process extremely simple.

[0013]

【Example】

 1A and 1B are a plan view and a sectional view of a label which is an embodiment of the present invention. The label 10 of this embodiment is composed of only the heat-stretchable sheet 11, and on one surface thereof, there is an ink layer 12 on which a trademark or a bar code of a product to which the label is attached is printed. Here, as the heat-stretchable sheet 11, a shape memory resin such as polyurethane or polyisopropylene, or a shape memory alloy such as a Cu-Al-Zn alloy or a Ti-Ni alloy can be used. Further, a heat-shrinkable resin film (so-called shrink film) of polyvinylidene chloride, polyvinyl chloride, polybutadiene, polyethylene, polypropylene, polystyrene or the like can also be used.

When attaching this label to a bottle, a can, etc., as shown in FIG. 1C, an adhesive is applied to one surface of the label 10 (the surface opposite to the printing surface 12 in FIG. 1C). 13 is applied, and a label is attached to the surface of the glass bottle 14 or the can as shown in FIG. 1 (d). Such labeling of bottles and the like can be carried out using a commonly used automatic labeling device. In this case, use a long film-like (roll-like) label in which a large number of labels are connected, instead of using labels separated into individual sheets as shown in Fig. 1 (a), just before sticking to bottles, etc. It is also possible to use a method of cutting with an automatic labeling device.

As shown in FIG. 2, an adhesive 13 may be applied to the printing surface 12 side in order to protect the printing surface 12. Further, in order to make the printing ink get on the heat stretchable sheet 11 well, as shown in FIG. 3, a matting treatment 15 may be applied to the surface of the heat stretchable sheet 11 on the printing surface 12 side.

In the above embodiment, no adhesive was applied to the label itself, but in the example shown in FIG. 4, the heat stretchable sheet 11 is coated with the adhesive 13 in advance. In the label 10 of this embodiment, the adhesive layer 13 is covered with a release paper 16 in order to facilitate the handling of the label 10 before it is attached to a bottle or the like. Also in this example, a large number of labels may be connected to each other to form a roll-shaped label.

As the adhesive 13, any of those conventionally used for sticking a label of this type can be used, but in the case of the present invention, from the convenience of peeling described later, It is preferable to use a water-soluble adhesive or a thermally decomposable adhesive. Water-soluble adhesives include starch and starch derivatives, cellulose and cellulose derivatives, alginic acid, agar, pectin, acacia, pullulan, dextran, proteins, casein, gelatin, polyvinyl alcohol, polyvinyl ether, polyvinylpyrrolidone, polyacrylic. Acid soda, polyacrylamide, polyethyleneimine, polyethylene oxide, isobutene-maleic anhydride copolymer, methyl vinyl ether-maleic anhydride copolymer, polyvinyl alcohol-acrylamide modified product, water-soluble epoxy resin, styrene-allyl alcohol copolymer Examples thereof include polymers, styrene-maleic anhydride, maleic acid-polyethylene glycol copolymers, emulsion adhesives, and water-soluble UV-curable adhesives. Further, an adhesive containing ethylene oxide or propylene oxide causes phase separation when heated, and thus can be used as a thermally decomposable adhesive.

Another embodiment of the present invention is shown in FIG. The label 10 of this embodiment is formed by adhering a label sheet 17 to a heat-stretchable sheet 11 with an adhesive 18 in order to increase the degree of freedom in printing and give the label various functions. For example, by using paper (including high-quality paper, art paper, mirror-coated paper, impregnated paper, etc.) as the label sheet 17, it is possible to print much more than when directly printing on the various heat-stretchable sheets 11. A variety of print expressions can be performed, and a more beautiful label can be obtained. Also, by using a metal foil such as aluminum or foil paper (paper or resin base material coated or vapor-deposited with metal foil such as aluminum) as the label sheet 17, a beautiful label having a metallic luster can be obtained. At the same time, it can be used as a functional label (a pattern of the non-conductive portion and the conductive portion is formed by ink) by utilizing its conductivity. In addition to this, as the label sheet 17, a sheet (including non-woven fabric), a resin sheet (polyester, vinyl chloride, acetate, etc.), a foamed body, etc. can be appropriately used depending on the application.

The adhesive 18 for adhering the heat-stretchable sheet 11 and the label sheet 17 of this embodiment does not need to be peeled off the both sheets later, and therefore the above-mentioned restrictions on water solubility and thermal decomposability are particularly limited. Rather, any adhesive can be used. Therefore, both sheets may be adhered using a heat-sealing film.

The label 10 of this embodiment may be in the form of a continuous roll as in the above embodiment, or as shown in FIG. 6, an adhesive 13 is applied in advance and covered with a release paper 16. Good. At this time, the surface on which the adhesive 13 is applied may be on the side of the heat-expandable sheet 11 as shown in FIG. 6 or on the side of the label sheet 17 as shown in FIG. This is the same not only in the case of the label to which the adhesive has been applied in advance, but also in the case of applying the adhesive just before sticking to a bottle or the like.

The heat-stretchable sheet may be contained in any layer of the label, and as shown in FIG. 8, label sheets 17, 17 ′ may be provided on both sides of the heat-stretchable sheet 11. ..

In the example shown in FIGS. 5 to 8, another label sheet 17 was laminated on the heat-stretchable sheet 11 with an adhesive, but as shown in FIG. The thin layer 19 can also be formed by applying grease and drying it. Also in this case, not only a beautiful label can be produced, but also a functional label can be produced by applying various functional materials. For example, a label capable of carrying magnetic information can be prepared by applying a mixture of magnetic powder such as ferrite powder and binder.

After sticking the label of this embodiment to bottles, cans, etc. as described above, those bottles, cans are put on the market and circulated, but after the bottles, etc. after use have been collected, Labels need to be stripped during the recycling process to reuse them. At this time, the label according to the present invention can be peeled off by the following simple process.

FIG. 10 shows an outline of an example of an apparatus for peeling a label of a beer bottle to which a label according to the present invention is attached. Here, a beer bottle is used as an example of the container, but of course, this can be applied to any shape such as a square whiskey bottle and a can of irregular shape. Further, the label may be any of those described above and shown in FIGS. 1 to 6.

The present apparatus is mainly composed of a carrying line 20 for hanging down the beer bottles 25 one by one and continuously carrying them. The carrier line 20 descends at a water tank 22 filled with hot water 21 maintained at a temperature of about 100 ° C., and the portion of the beer bottle 25 to which the label 10 is attached is immersed in the hot water 21. As a result, the heat-stretchable sheet included in the label 10 expands and contracts due to heat, and the label 10 is peeled off from the bottle 25. In order to promote the peeling of the label 10, it is effective to rotate or vibrate the beer bottle 25 in the water tank 22 (the same is true when the hot water 21 is stirred). Further, instead of immersing in the water tank 22 filled with the hot water 21, the hot water may be jetted to the label 10 portion of the beer bottle 25 with a strong force or the high temperature steam may be sprayed in the closed container.

When the label 10 is heated in this way, the heat-stretchable sheet expands and contracts and is peeled off from the bottle 25. However, the adhesive agent 13 attached to the bottle 25 still remains on the bottle 25. To do. Therefore, by using a water-soluble adhesive 13, the adhesive 13 is also removed from the bottle 25 in the water tank 22. That is, the cleaning work such as the label removal and the adhesive removal can be performed all at once by only the simple process of immersing the bottle 25 in the water tank 22 filled with the hot water 21. The same is true with the use of a thermally decomposable adhesive.

When such an adhesive 13 is not used, the beer bottle 25 is placed in the mechanical peeling chamber 23, and the adhesive layer 13 remaining on the surface is mechanically removed. As the removal processing in this mechanical peeling chamber, shot projection or friction with a brush can be performed.

[0028]

[Effect of the device]

 Since the label according to the present invention includes the heat-stretchable sheet, the label can be easily peeled from the bottle or the like only by heating the bottle or the like to which the label is attached. Also, by using a water-soluble or heat-decomposable adhesive as the adhesive for adhering the heat-expandable sheet to the bottle, etc., the label and the adhesive layer can be formed simply by immersing the bottle in hot water. And can be removed at the same time, and the work of regenerating bottles and the like becomes very easy. As a result, recycling costs for bottles, etc. are reduced and recycling is promoted, which greatly contributes to the saving of resources and energy.

[Brief description of drawings]

FIG. 1 is a plan view (a), a cross-sectional view (b), a cross-sectional view (c) with an adhesive, and a label which is an embodiment of the present invention when attached to the surface of a bottle or the like. Sectional view (d).

FIG. 2 is a cross-sectional view of the label of the embodiment of FIG. 1 when the printing surface is on the adhesive side.

FIG. 3 is a cross-sectional view of the label when the surface of the heat-stretchable sheet is mat-treated.

FIG. 4 is a cross-sectional view of an example of a label in which an adhesive and release paper are preliminarily laminated on a heat stretchable sheet.

FIG. 5 is a cross-sectional view of an example of a label in which a label sheet is laminated on a heat stretchable sheet.

FIG. 6 is a cross-sectional view of an example of a label in which an adhesive and release paper are preliminarily laminated on the sheet of FIG.

FIG. 7 is a cross-sectional view of an example of a label in which the stacking order of the heat stretchable sheet and the label sheet is changed.

FIG. 8 is a cross-sectional view of an example of a label in which label sheets are laminated on both sides of a heat stretchable sheet.

FIG. 9 is a cross-sectional view of an example of a label in which a coating thin layer is laminated on a heat-stretchable sheet.

FIG. 10 is a schematic configuration diagram of an example of an apparatus for peeling a label from a bottle having a label according to the present invention.

[Explanation of symbols]

10 ... Label 11 ... Thermally stretchable sheet 12 ... Printing ink 13 ... Adhesive 14 ... Bottle etc. 15 ... Surface matte layer 16 ... Release paper 17 ... Label sheet 18 ... Adhesive 19 ... Coating thin layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G09F 3/10 J 7028-5G

Claims (5)

[Scope of utility model registration request] 1. An easily peelable label comprising a heat-stretchable sheet. 2. The easily peelable label according to claim 1, wherein the heat-stretchable sheet is a sheet of a shape memory resin or a shape memory alloy. 3. The easily peelable label according to claim 1, wherein the heat-stretchable sheet is a shrink film. 4. An easily peelable label comprising a heat-stretchable sheet and an adhesive layer. 5. The stretching temperature of the heat-stretchable sheet is 100 ° C.
The easily peelable label according to claim 4, which is the following and the adhesive constituting the adhesive layer is water-soluble.