JP2015132672A - Heat-shrinkable cylindrical label and label-attached container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a label-attached container in a part of a design-printed layer of which no distortion is generated.SOLUTION: A heat-shrinkable cylindrical label 1 has a heat-shrinkable base material film 2. On the heat-shrinkable base material film 2 is provided a design-printed layer 4. On the design-printed layer 4 is provided a distortion suppression layer 7 formed of a medium or bond having a thickness of 3 μm or more.

Description

  The present invention generally relates to a heat-shrinkable cylindrical label, and more particularly to a heat-shrinkable cylindrical label improved so as to reduce the distortion of a design print layer during shrinkage. The invention also relates to a labeled container fitted with such a heat-shrinkable cylindrical label.

  Body care (soap, body soap, hand soap, etc.), skin care (lip balm, hand cream, sunscreen cream, antiperspirant, etc.), shaving (razor, dead hair treatment razor, shaving foam, etc.), hair care (shampoo, conditioner)・ Toiletries such as hair sprays and hair restorers) and bathing agents, cylindrical heat with a design printing layer so that consumers can easily distinguish their products and similar products from other companies. A shrinkable label is provided.

  FIG. 5A is a perspective view of a heat-shrinkable cylindrical label having such a design printing layer. FIG. 5B is a cross-sectional view taken along line BB in FIG.

  The conventional heat-shrinkable cylindrical label 1 is center-sealed with the ends overlapped so that the polystyrene-based heat-shrinkable base film (thickness 50-60 μm) 2 forms a tube. 3 represents a center seal portion sealed with a solvent. A design printing layer 4 is printed on the back surface of the heat-shrinkable cylindrical label 1 (the portion that comes into contact with the body surface of the container).

  As shown in FIG. 6 (A), such a heat-shrinkable cylindrical label 1 is placed, for example, around the trunk of a polyethylene container 5, passed through a dry heat tunnel, and heat-shrinked. At this time, when a heat-shrinkable cylindrical label formed of a conventional polystyrene-based heat-shrinkable base film (thickness 50 to 60 μm) is shrunk in a dry heat tunnel, hot air at a high temperature (90 to 110 ° C.) is rapidly applied. Since distortion occurs when it is applied, first, it is preliminarily shrunk at a low temperature of 70 to 80 ° C. for 10 to 15 seconds so as not to be displaced, folded, or distorted. It was shrunk so as not to remain. By such an operation, as shown in FIG. 6B, the heat-shrinkable cylindrical label 1 is mounted around the trunk portion of the container 5.

  However, due to recent efforts to reduce environmental impact, heat shrinkable base film has become thinner, and polystyrene heat shrinkable multilayer films and polyester heat shrinkable films (thickness 40 μm) are the basis for dry heat shrinkable labels. It came to be used as a material. When such a thin film is used, the waist is lowered, the shrinkage difference between the hot air hitting part and the non-swinging part becomes large, and there is a problem that distortion 6 is likely to occur as shown in FIG. It was. In particular, wrinkles due to distortion were noticeably observed in the design print layer 4, which was a problem in sales promotion.

  The present invention regulates the shrinkage of the design print layer when the label is thinned. Patent Document 1 discloses a technique for providing a plurality of lines of linear shrinkage restricting portions extending in the vertical direction. However, this is not a technique for suppressing wrinkles in the design print layer as in the present invention.

JP 2013-107705 A

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an improved heat-shrinkable cylindrical label that can reduce the distortion of the design print layer during heat shrinkage. And

  Another object of the present invention is to provide a container equipped with such a heat-shrinkable cylindrical label.

  The heat-shrinkable cylindrical label according to the present invention is a heat-shrinkable cylindrical label attached to the outer periphery of the body of the container, and is provided on the heat-shrinkable base film and the back surface of the heat-shrinkable base film. Design printed layer. A strain suppression layer having a thickness of 3 μm or more is provided on the design print layer so as not to distort the design print layer when contracted.

  The upper limit of the thickness of the strain suppression layer is 10 μm, preferably 8 μm, more preferably 5 μm. When the thickness of the strain suppression layer exceeds 10 μm, it is not preferable because shrinkage is insufficient and an appearance defect is exhibited.

  The present invention is effective when the film thickness of the heat-shrinkable base film is 40 μm or less. The heat-shrinkable base film has been thinnest about 35 μm so far, but it is in the direction of thinning to 30 μm. By reducing the amount of material used, the amount of raw materials used is reduced, contributing to a reduction in environmental impact. On the other hand, although the waist becomes weak, the strain suppression layer reinforces this. When the thickness of the strain suppression layer is less than 3 μm, it is insufficient for reinforcing the low back of the heat-shrinkable base film.

  The strain suppression layer is preferably formed of a bond or a medium. Examples of the medium used in the present invention include a urethane resin cured with an isocyanate curing agent and an acrylic-nitrocellulose resin.

  Examples of the bond used in the present invention include EVA adhesives such as EVA, EVA-PE, or EVA-chlorinated PP.

  A labeled container according to another aspect of the present invention is formed by shrinking the above-described heat-shrinkable cylindrical label with hot air and mounting the container on the container.

  The polyester resin forming the heat-shrinkable base film is preferably a resin generally called a copolyester resin. The acid component constituting the copolymerized polyester resin may be a known acid component such as terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acids such as 2,6-naphthalenedicarboxylic acid, 4,4′-dicarboxylic acid diphenyl, etc. Dicarboxybiphenyls, substituted phthalic acids such as 5-t-butylisophthalic acid, substituted dicarboxylbiphenyls such as 2,2,6,6-tetramethylbiphenyl-4,4′-dicarboxylic acid, 1,1, Aromatic dicarboxylic acids such as 3-trimethyl-3-phenylindene-4,5-dicarboxylic acid and substituted products thereof, 1,2-diphenoxyethane-4,4′-dicarboxylic acid and substituted products thereof, oxalic acid and malon Acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, pimelic acid, undecanoic acid, dodecanedica Aliphatic dicarboxylic acids such as boric acid, brassic acid, tetradecanedicarboxylic acid, tabsic acid, nonadecanedicarboxylic acid, docholine dicarboxylic acid and their substitutes, and alicyclic dicarboxylic acids such as 4,4′-dicarboxycyclohexane and the like Substituents and the like can be mentioned. The diol component may be a known component such as ethylene glycol, triethylene glycol, propylene glycol, butanediol, 1,6-hexanediol, 1,10-decanediol, neopentyl glycol, 2-methyl-2- Aliphatic diols such as ethyl-1,3-propanediol, 2-diethyl-1,3-propanediol, 2-ethyl-2-n-butyl-1,3-propanediol, 1,3-cyclohexanedimethanol Bisphenol compounds such as alicyclic diols such as 1,4-cyclohexanedimethanol, 2,2-bis (4′-β-hydroxyethoxydiphenyl) propane, bis (4′-β-hydroxyethoxyphenyl) sulfone Aromatics such as ethylene oxide adducts and xylylene glycol Diols, or diethylene glycol.

  Polystyrene resin forming the heat-shrinkable base film includes polystyrene, impact-resistant polystyrene, graft-type impact-resistant polystyrene, styrene-conjugated diene block copolymer, styrene-conjugated diene block elastomer, etc. It refers to the general resin. One type of polystyrene resin may be used, or a mixture of two or more types may be used.

  The center seal solvent is preferably tetrahydrofuran or methyl ethyl ketone when a polystyrene-based heat-shrinkable film is used for the base film. When using a polyester heat-shrinkable film, 1,3 dioxolane or tetrahydrofuran is preferred.

  Various known additives such as ultraviolet absorbers, anti-blocking agents, lubricants, antistatic agents, antibacterial agents, stabilizers, and the like may be appropriately added to the heat-shrinkable base film.

  The container is preferably formed of an olefin resin.

  As the olefin-based resin, preferably, ethylene or propylene as a main component, each homopolymer, or a random copolymer with other monomer (olefin, vinyl compound, etc.) copolymerizable therewith, or Examples include polymers containing cyclic olefins. The polyolefin resin may be one kind or a mixture of two or more kinds.

  According to the heat-shrinkable cylindrical label according to the present invention, a strain suppression layer having a thickness of 3 μm or more is provided on the design print layer so as not to distort the design print layer during shrinkage. The distortion of the design print layer at the time of shrinkage can be reduced.

(A) It is a perspective view of the heat-shrinkable cylindrical label which concerns on embodiment of this invention, (B) is sectional drawing which follows the BB line. It is a figure which shows the process of mounting | wearing a container with the heat-shrinkable cylindrical label which concerns on Example 1 of this invention, and making it heat-shrink. It is a figure which shows in detail the process made to heat-shrink in two steps. It is a conceptual diagram which shows a mode that the heat-shrinkable cylindrical label which concerns on Example 1 heat-shrinks. (A) It is a perspective view of the conventional heat-shrinkable cylindrical label which has a design printing layer, (B) is sectional drawing which follows the BB line in FIG. 5 (A). It is a figure which shows a mode that the conventional heat-shrinkable cylindrical label with a thick film | membrane is mounted | worn to a container. It is a figure which shows the problem at the time of making the film thickness of a label thin by the conventional method.

  The purpose of obtaining a heat-shrinkable cylindrical label improved so as to reduce the distortion of the design print layer at the time of heat shrink is to prevent the design print layer from being distorted on the design print layer. This was realized by providing a strain suppression layer having a thickness of 3 μm or more. Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same reference number is attached | subjected to the same part or an equivalent part, and the description is not repeated.

  FIG. 1A is a perspective view of a heat-shrinkable cylindrical label according to an embodiment of the present invention. FIG. 1B is a cross-sectional view taken along line BB in FIG.

  With reference to these drawings, the heat-shrinkable cylindrical label 1 is a heat-shrinkable multilayer film (film thickness 40 μm) using a polyester resin and a polystyrene resin (GUNZE HGL, HSA type). A base film 2 is provided. A design printing layer 4 is provided on the heat-shrinkable base film 2. The ends are overlapped and center-sealed so that the heat-shrinkable base film 2 forms a tube. The design print layer 4 is provided on the back surface side (the side in contact with the container) of the heat-shrinkable cylindrical label 1. On the design print layer 4, a strain suppression layer 7 made of bond or medium and having a thickness of 3 μm or more is provided. The strain suppression layer 7 is for preventing the design print layer from being distorted during heat shrinkage.

Loop stiffness tester (which evaluates the strength of a very thin material such as a film, which is obtained by converting the presser pressure when a sample is made into a loop into a numerical value using an electrical signal; manufactured by Toyo Seiki Seisakusho) Table 1 shows the results of measuring waist strength (stiffness) by changing the thickness of the suppression layer.
The thickness of the strain suppression layer 7 needs to be 3 μm or more. If the thickness is more than this, the weakness of the heat-shrinkable base film 2 (film thickness 40 μm) is reinforced. It was not possible to avoid this.

  Heat shrinkable multilayer film (Gunze's “HSA type”) 40μm with the gravure printing machine, the part where you want to reduce the distortion after design printing, bond with the laser plate of 60μm 100 lines “Daiichi Seika Kogyo Co., Ltd. Seikadine S sealant” Viscosity of 11 seconds / Zahn Cup No. 4 to form a strain suppression layer 7 having a film thickness of 3 μm. A heat-shrinkable cylindrical label 1 is formed from this, and is covered with a cylindrical container 8 as shown in FIGS. 2 (A) and 2 (B), and is heat-shrinked using two dry heat tunnels described later. The container with a shrinkage | contraction label with few distortions shown in FIG.

  Polyester heat-shrinkable film (Mitsubishi Resin “LX21 type”) 40μm gravure printing machine to reduce distortion after design printing, 60μm 100 lines laser version with medium “DIC Corporation UC Clear G-714NT Gloss 10% of “urethane curing agent W-325N” was added, and the viscosity was 11 seconds / Zahn cup no. 4 to form a strain suppression layer 7 having a film thickness of 3 μm. A heat-shrinkable cylindrical label 1 is formed from this, and is covered with a cylindrical container 8 for toiletries as shown in FIGS. 2 (A) and 2 (B), and is heat-shrinked using two dry heat tunnels described later. The container with a shrinkage | contraction label with few distortions shown to (C) was obtained.

  The heat shrinking process will be described in more detail. As shown in FIGS. 3A and 3B, two Kyowa Denki dry heat tunnels K-1000 were used.

  First, as shown in FIG. 3A, a polyethylene cylindrical container 8 covered with a heat-shrinkable cylindrical label 1 is placed on a belt conveyor 9 and passed through a dry heat tunnel 10 in a first tank. The dry heat tunnel 10 is provided with a hole 10a through which hot air passes. The state of the heat-shrinkable cylindrical label 1 before entering the dry heat tunnel 10 is as shown in FIG. The temperature in the tunnel 10 is set to 80 ° C. The speed scale of the belt conveyor is set to 10. The air volume 40 is set to open lower 1-2 near the entrance and open lower 1-2 near the exit. With this setting, even if the cylindrical container 8 has a tapered shape, first, heat shrinkage starts from the lower side of the label 1, so there is no deviation and no folding. Then, on the exit side of the tunnel 10, as shown in FIG. 4B, a portion around the design printing layer 4 is contracted.

  Next, after passing the dry heat tunnel 10 of the 1st tank, it conveys with the belt conveyor 9 and passes the dry heat tunnel 11 of the 2nd tank. The temperature in the tunnel 11 is set to 130 ° C. The speed scale of the belt conveyor is set to 10. Air volume 40, lower 1-4 is opened near the entrance, and lower 1-6 is opened near the exit. When set in this way and passed through the dry heat tunnel 11 in the second tank, as shown in FIG. 4C, the portion of the design print layer 4 contracts, and the label is attached firmly to the cylindrical container. Container 12 was obtained.

  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.

  According to the heat-shrinkable cylindrical label according to the present invention, a labeled container in which the design printed layer portion is not distorted is obtained.

DESCRIPTION OF SYMBOLS 1 Heat-shrinkable cylindrical label 2 Heat-shrinkable base film 3 Center seal part 4 Design printing layer 5 Polyethylene container 6 Strain 7 Strain suppression layer 8 Cylindrical container 9 Belt conveyor 10,11 Dry heat tunnel 10a Hole 12 Container with label

Claims (4)

1. A heat-shrinkable cylindrical label attached to the outer periphery of the body of the container,
   A heat-shrinkable substrate film;
   A design printing layer provided on the back surface of the heat-shrinkable substrate film;
   A heat-shrinkable cylindrical label provided on the design print layer and comprising a strain suppression layer having a thickness of 3 μm or more so as not to distort the design print layer during shrinkage.
2.   The heat-shrinkable cylindrical label according to claim 1, wherein the strain suppression layer is formed of a medium or a bond.
3.   The heat-shrinkable cylindrical label according to claim 1 or 2, wherein the heat-shrinkable base film has a thickness of 40 µm or less.
4.   The labeled container which shrinks | contracts the heat-shrinkable cylindrical label of any one of Claims 1-3 with a hot air, and attaches to a container.