JP2010175729A - Heat-sensitive label for carbonated beverage and bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-sensitive label for carbonated beverage which does not cause glue remainder and is improved so as not to cause slippage of the label even when the inner pressure of a bottle rises and so as not to be stripped even when being immersed in 40°C water. <P>SOLUTION: A first adhesive layer 2 for attaching the bottle and label is disposed on one side edge part on the back surface of the base material film 1, and a second adhesive layer 3 for attaching labels to each other is disposed on the other edge part. A third adhesive layer 4 formed with the same component as that of the first adhesive layer is disposed in proximity with the second adhesive layer 3 so as to fix the bottle and label at two spots. The second adhesive layer 3 comprises an EVA type oily bond layer 3a serving as substrate layer and an acrylic type aqueous emulsion bond layer 3b formed in an island shape by disposing an offset OFS on the EVA type oily bond layer 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates generally to a thermal label for carbonated beverages, and more specifically, there is no adhesive residue on the container, it can be easily peeled off, and even when the internal pressure of the bottle rises, a deviation occurs. The present invention relates to a heat-sensitive label for carbonated drinks which has been improved so that there is no such problem. Moreover, this invention relates to the container which affixed such a heat sensitive label for carbonated drinks.

  Various types of labels such as glass bottles and plastic bottles such as PET (polyethylene terephthalate) bottles are usually affixed and mounted with respect to container breakage protection, content display, and design.

  With reference to FIG. 6 (A), label sticking / mounting is performed by winding a rectangular label 14 made of a plastic film printed on the back surface around the outer periphery of the body of the PET bottle 15, and the leading end side 14a of the label back surface. Is adhered to the surface of the bottle 15 and the rear end side 14b is adhered to the surface of the wound label 14 with the adhesive 16, respectively. Thereby, the PET with the label 14 shown in FIG. You have a bottle 15.

  In recent years, from the viewpoint of reducing the amount of waste and effective use of resources, the movement to recycle used containers has become established, and labels attached to or attached to containers can be easily separated from containers during recycling Therefore, various labels using an adhesive suitable for them and containers with the label attached or attached have been proposed (see, for example, Patent Documents 1 and 2).

  By the way, in the peelability assessment of the evaluation criteria for labels and printing of the voluntary design guidelines for designated PET bottles issued by the PET Bottle Recycling Promotion Council on April 1, 2001, 1) physical peel test, 2) Three conditions of a peel test are presented: a hot water peel test, and 3) a hot alkali peel test.

  However, the thermal labels disclosed in Patent Documents 1 and 2 or the thermal labels currently on the market can be peeled off by hot alkali, but there is nothing in which the adhesive does not remain in the bottle by hot water peeling. In addition, there are few contractors that have hot alkali treatment facilities, and most of them have only hot water treatment facilities.

  Therefore, there is a demand for a heat-sensitive label in which the label is easily peeled off from the bottle only by hot water treatment and no adhesive remains on the bottle.

  In addition, when the heat-sensitive label is attached to PET filled with carbonated beverages, the following problems occur. That is, when a bottle containing a carbonated beverage is exposed to a high temperature condition due to environmental changes, the inner pressure of the bottle increases, and the bottle diameter increases. Due to the change in the body diameter, the adhesion between the label of the wound label and the portion where the label is bonded cannot be endured, and the label is displaced. The deviation causes a problem in appearance and a problem that the label is peeled off. In order to solve such a problem, Patent Document 3 proposes a thermal label as shown in FIG.

  With reference to FIG. 7, the thermal label for carbonated drink disclosed in Patent Document 3 includes a base film 1. 2nd adhesive layer which is the back surface of base film 1, Comprising: The 1st adhesive bond layer 2 which adhere | attaches a container and a label is provided in one edge part, and the other edge part adhere | attaches labels 3 is provided. In the vicinity of the second adhesive layer 3, a third adhesive layer 4 is provided.

  FIG. 8 is a cross-sectional view of the body of the container 7 filled with a carbonated beverage 8 to which such a heat-sensitive label is attached. Since the thermosensitive label and the container are fixed at two locations by the first adhesive layer 2 and the third adhesive layer 4, although there are overlapping portions of the thermosensitive label, even if the internal pressure of the bottle rises, The thermal label is not misaligned.

JP 2003-36030 A JP 2006-106234 A JP 2007-25464 A

  However, in the wound label attached to the carbonated bottle, it is required that the label does not peel off when immersed in water at 40 ° C. for 1 week, assuming that it is immersed in water in the summer. In the heat-sensitive label proposed in Patent Document 3, referring to FIG. 9, when immersed in water at 40 ° C., water enters the bonding surface of the second adhesive layer 3 as shown in the figure, There was a problem that the second adhesive 3 swelled and the adhesive strength was lowered, the label was pulled on both sides, label displacement occurred, and finally it peeled off.

  The present invention has been made to solve the above-described problems, and has improved heat sensitivity for carbonated beverages so that there is no adhesive residue and label displacement does not occur even when the internal pressure of the bottle increases. The purpose is to provide a label.

  Another object of the present invention is to provide a heat-sensitive label for carbonated drinks which is improved so as not to peel even when immersed in water at 40 ° C.

  Another object of the present invention is to provide a container to which such a heat sensitive label for carbonated beverages is attached.

  The present invention relates to a heat-sensitive label for carbonated beverages that is attached by attaching one end of a base film to a body of a container and winding the other end on the one end. . A first adhesive layer that adheres the container and the label is provided on the one end of the base film. A second adhesive layer for adhering labels to each other is provided at the other end of the base film, and is formed of the same components as the first adhesive layer in the vicinity of the second adhesive layer. A third adhesive layer for bonding the container and the label is provided. The second adhesive layer includes an oil-based bond layer serving as an underlay layer, and an acrylic aqueous emulsion bond layer formed in an island shape by providing an offset on the oil-based bond layer.

  According to the present invention, since the third adhesive layer formed of the same component as the first adhesive layer is provided in the vicinity of the second adhesive layer, the container and the label are 2 Even if the internal pressure of the bottle rises, it will not shift. In addition, when attached to the bottle, the water-resistant EVA oil-based bond layer that forms the underlay layer (anchor coat), which is a constituent component of the second adhesive layer, is formed in an island shape with an offset. An acrylic water-based emulsion bond layer that is an intermediate bond is covered from above and protected from water.

  The application area of the third adhesive layer is preferably larger than the application area of the second adhesive layer. Thereby, the adhesive force of a container and a label is strengthened.

  The base film is preferably a biaxially stretched polypropylene film or a biaxially stretched polyester film.

  The olefin-based adhesive is an unsaturated carboxylic acid anhydride and / or one or more propylene resins selected from an ethylene-propylene copolymer, a propylene-butene copolymer, and an ethylene-propylene-butene copolymer. It is formed of a resin graft-modified with (meth) acrylic acid ester having 8 to 18 carbon cords, and contains 0.2 to 20% by weight of the unsaturated carboxylic acid anhydride and / or (meth) acrylic acid ester. It is preferable.

  If comprised in this way, a label will peel from a bottle easily only by a hot water process, and an adhesive agent will not remain in a bottle.

  It is preferable to use an EVA oil-based bond for the oil-based bond layer.

  It is preferable that a surfactant is added to the first adhesive layer. When a surfactant is added, the label is more easily peeled from the bottle.

  According to the present invention, the container and the label are fixed at two locations, and even when the internal pressure of the bottle rises, no deviation occurs. As a result, even if the internal pressure of the bottle increases, the aesthetic appearance is not impaired and the label is not peeled off. Moreover, even if it is immersed in 40 degreeC water, it does not peel off.

(A) It is a reverse view of the thermosensitive label which concerns on Example 1. FIG. (B) It is sectional drawing which follows the BB line in FIG. 1 (A). It is a perspective view of the roll by which the label was formed continuously and rolled up before cutting out the thermosensitive label which concerns on Example 1. FIG. It is a figure explaining the method of mounting | wearing the PET bottle with the thermosensitive label which concerns on an Example. (A) It is sectional drawing of the trunk | drum of a carbonated beverages container with which the thermosensitive label was mounted | worn. (B) It is a top view in the projection of the thickness direction of the label of the vicinity of the 2nd adhesive bond layer 3 at the time of mounting | wearing. (C) It is sectional drawing in the thickness direction of the label of the 2nd adhesive bond layer 3 vicinity at the time of mounting | wearing. It is the figure which compared and showed the 180 degree peeling strength of the Example, the comparative example 1, and the comparative example 2. FIG. It is a figure which shows a mode that the thermosensitive label which concerns on a prior art example is mounted | worn on a PET bottle. It is a reverse view of the thermosensitive label which concerns on another prior art example. It is sectional drawing of the trunk | drum of the carbonated beverage container with which the thermosensitive label which concerns on another prior art example was mounted | worn. It is a figure which shows the problem of the thermosensitive label which concerns on another prior art example.

  The purpose of obtaining a heat-sensitive label for carbonated beverages which is improved so that even if the internal pressure of the bottle is increased, the label is not displaced and is not peeled even when immersed in water at 40 ° C. An EVA system in which a third adhesive layer formed of the same component as the first adhesive layer is provided in the vicinity of the second adhesive layer, and the second adhesive layer serves as an underlay layer This was realized by comprising an oil-based bond layer and an acrylic water-based emulsion bond layer formed in an island shape by providing an offset on the EVA oil-based bond layer. Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same members are denoted by the same reference numerals, and the description thereof will not be repeated.

  FIG. 1A is a diagram illustrating the back surface of the thermal label according to the embodiment. FIG. 1B is a cross-sectional view taken along line BB in FIG.

  With reference to these figures, the heat-sensitive label for carbonated beverages according to the examples includes a base film 1. 2nd adhesive layer which is the back surface of base film 1, Comprising: The 1st adhesive bond layer 2 which adhere | attaches a container and a label is provided in one edge part, and the other edge part adhere | attaches labels 3 is provided. In the vicinity of the second adhesive layer 3, a third adhesive layer 4 formed of the same components as the first adhesive layer is provided. The second adhesive layer 3 includes an EVA oil-based bond layer 3a serving as an underlay layer, and an acrylic aqueous emulsion bond layer 3b formed in an island shape by providing an offset OFS on the EVA oil-based bond layer 3a. Consists of. These adhesive layers 2, 3, and 4 are simultaneously formed in the step of forming the printing layer 5 on the back surface.

  With reference to FIG. 2, the thermal labels are taken out from the rolls in which they are continuously formed and wound.

  The first adhesive layer for bonding the container and the label contains an olefin-based adhesive.

  In the present invention, the base film of the thermosensitive label is a biaxially stretched polypropylene film or a biaxially stretched polyester film, and the thickness of the base film is preferably 12 to 80 μm, more preferably 15 to 60 μm.

  Specific examples of commercially available base films include biaxially oriented polypropylene films such as “PYLEN (registered trademark) P2261 (single-sided corona treatment), P2161 (double-sided corona treatment)” manufactured by Toyobo Co., Ltd. "FOS (single-sided corona treatment), FOS-BT (double-sided corona treatment)" manufactured by Futamura Chemical Co., Ltd., "Trephan (registered trademark) 2548 (double-sided corona treatment), 2578 (single-sided corona treatment)" manufactured by Toray Industries, Inc. Can be illustrated.

  Examples of the biaxially stretched polyester film include “Toyobo Espet (registered trademark) E5100” manufactured by Toyobo Co., Ltd., “Lumirror (registered trademark) T60” manufactured by Toray Industries, Inc., and “Teijin Tetron Film G2 manufactured by Teijin DuPont Films Ltd.” , Melinex (registered trademark) S "and the like can be preferably used.

  In the present invention, the olefin-based adhesive forming the first adhesive layer for bonding the container and the label is selected from an ethylene-propylene copolymer, a propylene-butene copolymer, and an ethylene-propylene-butene copolymer. 1 or more types of propylene-type resin is included in the resin graft-modified by unsaturated carboxylic acid anhydride and / or (meth) acrylic acid ester which has 8-18 carbon atoms.

  As the unsaturated carboxylic acid anhydride, maleic anhydride, itaconic anhydride, citraconic anhydride or aconitic anhydride can be used, and itaconic anhydride or maleic anhydride is preferable.

  Examples of the (meth) acrylic acid ester having 8 to 18 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, and (meth) acrylic. Octyl acid, lauryl (meth) acrylate or stearyl (meth) acrylate can be used.

  The olefin-based adhesive may contain a tackifier. The tackifier is not particularly limited, and conventionally known tackifiers can be used. For example, terpene resin, hydrogenated terpene resin, petroleum resin and the like can be mentioned.

  Next, a method for attaching the thermosensitive label according to the example to the PET bottle will be described.

  With reference to FIG. 3, it takes out from the roll 6, cuts a label, and activates an adhesive with a heating roll. First, the first adhesive layer 2 is brought into contact with the container 7, and one end 1 a of the thermosensitive label is fixed to the container 7. Thereafter, the heat-sensitive label is wound around the body of the container 7, the container 7 and the heat-sensitive label are fixed by the third adhesive layer 4, and the heat-sensitive label is formed by the acrylic aqueous emulsion bond layer 3b of the second adhesive layer 3. The other end portion 1b and the one end portion 1a are bonded together. The container and the label are bonded and fixed in two places.

  The first adhesive layer 2 and the third adhesive layer 4 are formed of the same component and contain an olefin-based adhesive. This olefin-based adhesive has a characteristic that it can be removed with hot water.

  FIG. 4A is a cross-sectional view of the trunk portion of the container 7 filled with the carbonated beverage 8 with the heat-sensitive label thus attached. Since the thermosensitive label and the container are fixed by the first adhesive layer 2 and the third adhesive layer 4 at two locations, the thermosensitive label overlaps, but the thermosensitive label is not affected even if the internal pressure of the bottle rises. There is no label misalignment. As a result, even if the bottle containing carbonated beverages is exposed to high temperature conditions due to environmental changes, the internal pressure of the bottle rises, the bottle diameter increases, The appearance is not impaired and the label is not peeled off.

  4B, which is a plan view of the projection in the thickness direction of the label in the vicinity of the second adhesive layer 3 when the label is attached to the bottle, and FIG. 4C, which is a cross-sectional view. The EVA-based oil-based bond layer 3a of the underlying layer (anchor coat), which is a constituent component of the second adhesive layer 3, is a bond between the label and the label, provided in an island shape with an offset. The acrylic aqueous emulsion bond layer 3b is covered from above. The acrylic water-based emulsion bond layer 3b is weak against water but has strong adhesive strength, and comes into contact with the base film 1 to adhere the base film 1 and the thermosensitive label. Since an offset is provided between the outer periphery of the EVA oil-based bond layer 3a and the outer periphery of the acrylic aqueous emulsion bond layer 3b, the outer surface of the acrylic aqueous emulsion bond layer 3b is all resistant to water and wider. The area is covered with an EVA oil-based bond layer 3a having an area, and the acrylic water-based emulsion bond layer 3b is protected from water penetration as shown in the figure.

  In fact, when the heat-sensitive label was designed in this way, it was confirmed that even if it was immersed in a water tank left in an environment of 40 ° C. and humidity 90% for one week (water temperature approximately 40 ° C.), it did not peel off.

  FIG. 5 shows the results of examining the 180 ° peel strength of the heat-sensitive labels of Examples, Comparative Examples 1 and 2. When the second adhesive layer 3 is configured by providing an offset with a combination of the acrylic water-based emulsion bond layer 3b and the EVA oil-based bond layer 3a as in the embodiment, a material having a strong 180 ° peel strength is obtained, and A product with little difference in 180 ° peel strength between before and after water immersion was obtained. On the other hand, when the 2nd adhesive bond layer 3 was comprised only by the EVA type oil-based bond layer like the comparative example 1, the thing with a strong 180 degree peeling strength was not obtained. Moreover, when the 2nd adhesive bond layer 3 was comprised only with the acryl-type aqueous emulsion bond layer like the comparative example 2, the fall of 180 degree peel strength after water immersion was remarkable.

  As for the thickness of the 1st and 3rd adhesive bond layers 2 and 4 containing an olefin type adhesive agent, 1-10 micrometers is preferable. When the thickness is within this range, suitable adhesive strength can be obtained, which is preferable.

  The thickness of the second adhesive layer 3 (the sum of the thickness of the EVA oil-based bond layer 3a and the thickness of the acrylic aqueous emulsion bond layer 3b) is preferably 3 to 12 μm.

  Organic fine particles, inorganic fine particles, liquid wax, solid wax, acrylic resin or urethane resin for the purpose of imparting blocking resistance to the first adhesive layer, the second adhesive layer and the third adhesive layer May be added.

  In the present invention, the printing ink for forming the printing layer is not particularly limited as long as the biaxially stretched polypropylene film or the biaxially stretched polyester film has adhesiveness and can be printed, and a conventionally known printing ink may be used. it can. The printing method is not particularly limited, but gravure printing is preferable in terms of productivity. The thickness of the print layer is generally 0.5 to 2.0 μm, although the thickness varies depending on the design.

  The first adhesive layer, the second adhesive layer, and the third adhesive layer are also preferably formed by application by gravure printing or the like when printing the printing layer. The first adhesive layer and the second adhesive layer are applied on the printed layer, or the positions at which the first adhesive layer, the second adhesive layer, and the third adhesive layer are applied. There is also a method in which a first adhesive layer, a second adhesive layer, and a third adhesive layer are applied after printing with a design cut out in advance so that a printing surface is not formed. When the adhesive layer is applied after printing with a design in which the printed layer is cut out, blocking resistance can be improved by designing the adhesive layer and the printed layer so that the surfaces thereof are substantially the same. When the adhesive layer is applied on the printed layer, the printing ink and the adhesive are mixed in, and the adhesion (adhesive strength) between the base film of the thermal label and the adhesive is preferably improved.

  The heat-sensitive label obtained in this way causes a problem in appearance even if the inner diameter of the bottle rises from a container such as a bottle and the diameter of the bottle increases or changes in the diameter of the bottle. In addition, there is an effect that the label is not peeled off, it can be easily peeled off, and no adhesive remains in the container. Further, it is immersed in a water bath left in an environment of 40 ° C. and 90% humidity for 1 week ( Even if the water temperature is about 40 ° C., it does not peel off.

  In the above embodiment, the case where an EVA oil-based bond is used for the oil-based bond layer serving as the underlay layer is exemplified, but the present invention is not limited to this, and the acrylic aqueous emulsion bond formed thereon is used. Any of those having affinity for the layer can be used.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Since the heat-sensitive label according to the present invention is peeled off from the plastic bottle only by the hot water treatment, and no glue remains on the plastic bottle side, a highly recyclable plastic bottle can be obtained.

DESCRIPTION OF SYMBOLS 1 Base film 1a One edge part 1b The other edge part 2 1st adhesive bond layer 3 2nd adhesive bond layer 3a EVA oil-based bond layer 3b Acrylic aqueous emulsion bond layer 4 3rd adhesive bond layer 5 Printing Layer 7 Container 14 Label 14a Front end side 14b Rear end side 15 Bottle 16 Adhesive

Claims (7)

It is a heat-sensitive label for carbonated beverages that is attached by attaching one end of the base film to the body of the container and winding it, and attaching the other end onto the one end,
A first adhesive layer including an olefin-based adhesive provided on the one end and adhering the container and the label;
A second adhesive layer that is provided at the other end and bonds the labels;
A third adhesive layer provided adjacent to the second adhesive layer and formed of the same components as the first adhesive layer, for adhering the container and the label;
The second adhesive layer is composed of an oil-based bond layer serving as an underlay layer, and an acrylic aqueous emulsion bond layer formed in an island shape by providing an offset on the oil-based bond layer. Thermal label for beverages.   The heat-sensitive label for carbonated beverages according to claim 1, wherein an application area of the third adhesive layer is larger than an application area of the second adhesive layer.   The heat-sensitive label for carbonated beverages according to claim 1, wherein the base film is a biaxially stretched polypropylene film or a biaxially stretched polyester film. The olefin-based adhesive is composed of one or more propylene resins selected from ethylene-propylene copolymer, propylene-butene copolymer and ethylene-propylene-butene copolymer, unsaturated carboxylic acid anhydride and / or Formed of a resin that has been graft-modified with (meth) acrylic acid ester having 8 to 18 carbon cords,
The heat-sensitive label for carbonated beverages according to any one of claims 1 to 3, wherein the unsaturated carboxylic acid anhydride and / or (meth) acrylic acid ester is contained in an amount of 0.2 to 20% by weight.   The heat-sensitive label for carbonated drinks of any one of Claims 1-4 which used EVA type oil-based bond for the said oil-based bond layer.   The heat-sensitive label for carbonated beverages according to any one of claims 1 to 5, wherein a surfactant is added to the first and third adhesive layers.   A carbonated beverage bottle to which the heat-sensitive label for carbonated beverages according to any one of claims 1 to 6 is attached.

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