JP2013117612A - Heat-shrinkable cylindrical label and container mounted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-shrinkable cylindrical label for preventing any wrinkle from being generated, and for realizing a container whose appearance is beautiful.SOLUTION: A heat-shrinkable cylindrical label 1 is mounted on the outer periphery of the trunk of a container, and formed so as to be cylindrical by center-sealing both end side parts of a label base material 2. A straight strip thermosensitive adhesive layer 7 is formed all around in a direction of the outer periphery of the trunk by excluding a center-sealed portion 3 on the inner surface of the heat-shrinkable cylindrical label 1. Thus, it is possible to prevent any wrinkle from being generated in the heat-shrinkable cylindrical label 1, and it is possible to realize the container whose appearance is beautiful.

Description

  The present invention generally relates to a heat-shrinkable cylindrical label, and more specifically, a heat-shrinkable cylindrical label in which a container and a label are fixed by part-coating a bond on the inner surface, thereby achieving a rotation prevention function. The present invention relates to a heat-shrinkable cylindrical label improved so as not to cause wrinkles in the part coat part. The present invention also relates to a container equipped with such a heat-shrinkable cylindrical label.

  For heat-shrinkable cylindrical labels attached to containers, especially when the shape of the container is linear, the label will easily rotate when capping when filling the contents, and the contents will leak without being able to capping firmly, etc. Trouble may occur.

  In order to prevent such troubles, in order to prevent the rotation of the label, it is generally adopted that a bond is partially applied to the inner surface of the label (referred to as a part coat). FIG. 6 is a perspective view of such a heat-shrinkable cylindrical label.

  The conventional heat-shrinkable cylindrical label 1 is formed in a cylindrical shape by overlapping the both end sides of the label base material 2 and performing center sealing, and is mounted on the outer periphery of the body of the container. Reference numeral 3 denotes a center seal portion. The inner surface of the label substrate 2 is part-coated with a bond 4 for fixing the container and the label in the longitudinal direction (MD: Machine Direction) for the purpose of preventing the label from rotating.

  FIG. 7 is a view when the conventional heat-shrinkable cylindrical label 1 is attached to a container 5 made of an olefin-based material such as polyethylene or polypropylene and containing a body soap, for example. Mounting is performed by covering the container 5 with the heat-shrinkable cylindrical label 1 and heat-treating it. At the time of heat shrinkage, the container 5 expands with hot air, and when it cools, the container 5 contracts. As a result, when the conventional heat-shrinkable cylindrical label 1 is used, the label 1 is slackened in the lateral direction (TD: Transverse Direction main shrinkage direction of the heat-shrinkable cylindrical label) as shown in the figure. The slackness affects the problem that wrinkles 6 occur in the vicinity of the bond 4 part coat. Such wrinkles 6 tend to occur more greatly when an olefin-based container is used, and as the material of the heat-shrinkable cylindrical label 1 moves to polyester or polystyrene and the thickness thereof becomes thinner. The wrinkle 6 has an impaired appearance as a product, and improvement has been desired as a problem.

  The present invention has been made to solve such problems, and in a heat-shrinkable cylindrical label having an anti-rotation function, the heat-shrinkable cylinder improved so as not to generate wrinkles in the part coat portion. The purpose is to provide a label.

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

  The present invention relates to a heat-shrinkable cylindrical label formed in a cylindrical shape by center-sealing both end sides of a label base material, which is attached to the outer periphery of a body portion of a container. And, on the inner surface of the heat-shrinkable cylindrical label, except for the center-sealed portion, a single band-like heat-sensitive adhesive layer is formed around the body outer peripheral direction. To do.

  With this configuration, it was confirmed that when the heat shrinks, the container swells with hot air, and even if it cools and the container shrinks, no wrinkles are generated due to loose labels.

  The heat-sensitive adhesive is an adhesive that exhibits adhesiveness by heating (including an adhesive generally referred to as a pressure-sensitive adhesive). For example, a hot-melt adhesive, a part coat heat-sensitive adhesive, A delayed tack type heat sensitive adhesive or the like can be used. Hot melt adhesives are adhesives that are not adhesive at room temperature but can be bonded by heating, and can be applied by heating and melting, such as ethylene-vinyl acetate copolymer and ethylene acrylic. Examples include those in which an additive such as a tackifier is blended with a base resin such as an ethylene resin such as an acid 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.

  The delayed tack-type heat-sensitive adhesive is an adhesive that is activated by heating to produce adhesiveness and that persists for a long time after cooling, and can be applied by printing such as gravure coating, Examples include an emulsion type in which a tackifier and a solid plasticizer are blended with a base resin such as an ethylene-vinyl acetate copolymer, a vinyl acetate-acrylic acid ester copolymer, and a synthetic rubber. Examples of these tackifiers include rosin resins, terpene resins, petroleum resins, and phenol resins.

  Various known additives such as ultraviolet absorbers, antiblocking agents, lubricants, antistatic agents, antibacterial agents, stabilizers, and the like may be added to the film for different purposes.

  The present invention is particularly effective when the container is formed of an olefin resin and is thinned, and the label substrate is formed of a polyester resin or a polystyrene resin and is thinned.

  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.

  The polyester resin 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.

  One type of copolymer polyester resin may be sufficient as it, and it is good also as a 2 or more types of mixture. Moreover, a polyethylene terephthalate resin, a polybutylene terephthalate resin, etc. may be included.

  The polystyrene-based resin refers to all resins having styrene as one of the constituent elements such as polystyrene, high-impact polystyrene, graft-type high-impact polystyrene, styrene-conjugated diene block copolymer, styrene-conjugated diene block elastomer.

  Polystyrene is a homopolymer composed of styrene derivatives such as styrene, α-methylstyrene, and p-methylstyrene, and a copolymer copolymerizable with styrene and styrene derivatives such as acrylic acid, methacrylic acid. Copolymerization with acids, metal salts thereof (for example, metal salts such as Na, K, Li, Mg, Ca, Zn, and Fe), aliphatic unsaturated carboxylic acids such as acrylic acid esters and methacrylic acid esters, and derivatives thereof Includes coalescence.

  The impact-resistant polystyrene means a mixture of polystyrene and a synthetic rubber such as polybutadiene or polyisoprene, or a product obtained by graft-polymerizing polystyrene to a synthetic rubber such as polybutadiene or polyisoprene.

  Graft type impact-resistant polystyrene is based on a structure in which particles composed of a rubber-like polymer in which polystyrene is contained in a continuous phase composed of polystyrene and polystyrene is grafted to a rubber component such as polybutadiene are dispersed. What you did.

  The styrene-conjugated diene block copolymer includes a styrene block and a block of conjugated diene such as butadiene and isoprene and / or a random block of styrene and conjugated diene, and has a styrene content of 51 to 99% by mass and a conjugated diene. This refers to a copolymer having a content of 49 to 1% by mass. A ternary or quaternary copolymer containing other components in the styrene-butadiene block copolymer is also included in the present invention. Examples of other components include acrylic acid, methacrylic acid, metal salts thereof (for example, metal salts such as Na, K, Li, Mg, Ca, Zn, and Fe), fats such as acrylic acid esters and methacrylic acid esters. Group carboxylic acids and derivatives thereof.

  Furthermore, what hydrogenated a part of double bond residue based on a conjugated diene can be illustrated.

  The styrene-conjugated diene block elastomer includes a styrene block and a block of conjugated diene such as butadiene and isoprene and / or a random block of styrene and conjugated diene, and has a styrene content of 1 to 90% by mass and a conjugated diene. An elastomer having a content of 99 to 10% by mass.

  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 1,3 dioxolane or tetrahydrofuran when a polyester heat-shrinkable film is used as the base film, and tetrahydrofuran or methyl ethyl ketone is preferable when a polystyrene heat-shrinkable film is used. In addition, although it is preferable to use a center seal solvent, it is also possible to bond with an adhesive.

  It is preferable that the outer circumferential direction of the trunk portion is coincident with the TD direction.

  This invention exhibits an effect when the thickness of the label substrate is 60 to 20 μm. The effect is exhibited particularly preferably when the thickness is 40 μm to 35 μm.

  The container according to the other situation of this invention concerns on the container with which the above-mentioned heat-shrinkable cylindrical label was mounted | worn by the trunk | drum outer periphery.

  According to the heat-shrinkable cylindrical label according to the present invention, it was confirmed that the label was not loosened even when the container was swelled by hot air during the heat shrinkage and then cooled and contracted. As a result, no wrinkles occur.

It is a perspective view of the heat-shrinkable cylindrical label which concerns on the Example of this invention. It is a perspective view of a container equipped with a heat-shrinkable cylindrical label according to an embodiment of the present invention. It is a figure which shows the manufacturing method of the heat-shrinkable cylindrical label which concerns on this invention. It is a perspective view of the heat-shrinkable cylindrical label which concerns on the other Example of this invention. It is a perspective view of the heat-shrinkable cylindrical label which concerns on a comparative example. It is a perspective view of the conventional heat-shrinkable cylindrical label. It is a perspective view of the container equipped with the conventional heat-shrinkable cylindrical label.

  In the heat-shrinkable cylindrical label with anti-rotation function, the center-sealed part is provided on the inner surface of the heat-shrinkable cylindrical label for the purpose of obtaining an improved label so as not to cause wrinkles in the part coat part. Except for this, it was realized by forming a single band-like heat-sensitive adhesive layer around the body part. Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a heat-shrinkable cylindrical label according to the present invention. The heat-shrinkable cylindrical label 1 is attached to the outer periphery of the body portion of the container, and is formed in a cylindrical shape by center-sealing both end portions of the label substrate 2. The stretching ratio in the horizontal direction (TD direction) of the label substrate 2 is 3 to 10 times, preferably 3 to 7 times. It is not necessary to stretch in the machine direction (MD direction), and in some cases, there may be stretching of about 1.8 times or less.

  On the inner surface of the heat-shrinkable cylindrical label 1, except for the center-sealed portion 3, a single band-like heat-sensitive adhesive layer 7 is formed around the body part. The label substrate 2 is made of a polyester resin or a polystyrene resin. The outer peripheral direction of the trunk portion is matched with the TD direction. The thickness of the label substrate 2 is 60 μm to 20 μm.

  With reference to FIG. 2, the heat-shrinkable cylindrical label 1 according to the present invention is attached so that the inner surface contacts the outer periphery of the body of a container 5 such as polypropylene, and the heat-shrinkable cylindrical label 1 is attached. When heat-shrinking with a dry heat-shrinking tunnel or lyister, the container 5 swells with hot air during heat-shrinking, and the label 1 does not loosen even if the container 5 shrinks due to cooling. As a result, the surface was not wrinkled.

  Next, the manufacturing method of such a heat-shrinkable cylindrical label is demonstrated.

  With reference to FIG. 3 (A), the raw film 8 which is the inner surface side and in which the band-like heat-sensitive adhesive layer 7 is formed in the TD direction is taken out from a roll (not shown). A sealing solvent 9 is applied to the end of the raw film 8 on the side that becomes the outer surface.

  Referring to FIGS. 3A and 3B, the film 8 is folded so that the surface on which the belt-like heat-sensitive adhesive layer 7 is formed is inward, and the end to which the sealing solvent 9 is applied is applied. A tube is formed when the other end is overlapped with this part, sandwiched between a pair of nip rollers 10 and 10, and both ends are sealed. In the figure, 3 is a seal portion.

  3 (B) and 3 (C), when a portion of the obtained long tube where the belt-like heat-sensitive adhesive layer 7 is not formed is selected and cut in the TD direction, Except for the sealed portion 3, the individual pieces of the heat-shrinkable cylindrical label 1 in which a single band-like heat-sensitive adhesive layer 7 is formed can be obtained.

  Next, another embodiment of the present invention will be described. Referring to FIG. 4 (A), even if the strip-like heat-sensitive adhesive layer 7 is formed on the upper side of the label as shown in FIG. 4 (A), as shown in FIG. 4 (B). Even if it was formed on the lower side of the label, wrinkles could not be formed.

  However, referring to FIG. 5A as a comparative example, when the heat-shrinkable cylindrical label 1 provided with two belt-like heat-sensitive adhesive layers 7 was attached, it was recognized that the label was loosened and wrinkled. . Therefore, it is important to use a heat-shrinkable cylindrical label provided with only one strip of heat-sensitive adhesive layer 7.

  In addition, referring to FIG. 5B, which is another comparative example, when the heat-shrinkable cylindrical label 1 provided with the discontinuous strip-like heat-sensitive adhesive layer 7 is attached, the label may be loosened and wrinkled. Admitted. Therefore, it is important to use a heat-shrinkable cylindrical label in which the belt-like heat-sensitive adhesive layer 7 is provided around the body portion.

  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, since wrinkles cannot be made, a container having a beautiful appearance can be realized.

DESCRIPTION OF SYMBOLS 1 Heat-shrinkable cylindrical label 2 Label base material 3 Center seal part 4 Bond 5 Container 6 Wrinkle 7 Heat-sensitive adhesive layer 8 Original film 9 Sealing solvent 10 Nip roller

Claims (5)

In the heat-shrinkable cylindrical label formed in a cylindrical shape by center-sealing the both end sides of the label base material, which is attached to the outer periphery of the body of the container,
A heat-sensitive adhesive layer is formed on the inner surface of the heat-shrinkable cylindrical label, except for the center-sealed portion, and a single band-like heat-sensitive adhesive layer is formed around the body portion. Shrinkable cylindrical label.   The heat-shrinkable cylindrical label according to claim 1, wherein the label base material is formed of a polyester resin or a polystyrene resin.   The heat-shrinkable cylindrical label according to claim 1 or 2, wherein the container is formed of an olefin resin.   The heat-shrinkable cylindrical label according to any one of claims 1 to 3, wherein the label substrate has a thickness of 60 to 20 µm.   The container by which the heat-shrinkable cylindrical label of any one of Claims 1-4 was mounted | worn by the trunk | drum outer periphery.