JP2012131205A - Heat shrinkable cylindrical label and manufacturing method thereof, and plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat shrinkable cylindrical label which is improved so that the label is flexible and hard to break and does not buckle during heating the label to make the label shrink.SOLUTION: The heat shrinkable cylindrical label is mounted around an outer periphery of a body of a container. The heat shrinkable cylindrical label 5 includes a heat shrinkable base material film having a right and left end parts, and the right end part and the left end part are lapped on each other and they are sealed to each other to form a tube from the heat shrinkable base material film 5. On a surface of the tube, a plurality of protruded parts 5a extending vertically and protrudedly pressed outward from an inside of the tube by a die, are formed.

Description

  The present invention relates generally to heat-shrinkable cylindrical labels, and more specifically improved to improve the compressive strength and label opening of the film and to improve the wearability of the thin film heat-shrinkable label on the labeler. The present invention relates to a heat-shrinkable cylindrical label. The present invention also relates to a method for producing such a heat-shrinkable cylindrical label. The present invention further relates to a plastic bottle in which such a heat-shrinkable cylindrical label is mounted on the outer periphery of the body.

  In general, a heat-shrinkable cylindrical label is used as a printing label such as a PET bottle, and this usage is generally as follows.

  First, a desired pattern is printed on a heat-shrinkable flat film mainly stretched in the transverse direction. Next, referring to FIG. 7A, the heat-shrinkable flat film 1 is overlapped at both ends at the center 2 and pressed (sealed) with a nip roll through an adhesive means (for example, an organic solvent, an adhesive, etc.). ) To form a cylinder. The cylindrical film formed by the roll pressure bonding is provided with creases 1a (two) at both ends with the seal portion interposed therebetween. Once crimped here, it is rolled as a flat roll as it is.

  Next, while unwinding from the roll, it is cut into a size of one to be fitted and loaded into a PET bottle or the like. After cutting, the label is opened from the outside by, for example, a suction pad, and a PET bottle 3 or the like is inserted therein with reference to FIG. 7B. Then, the label is thermally contracted by passing through a heating tunnel. Referring to FIG. 7C, the label is contracted mainly in the lateral direction, and is fastened and fixed around the trunk of the PET bottle 1 to complete a series of steps.

  By the way, the following points are required for the label. That is, the diameter is as close as possible to the outer diameter of a PET bottle, etc. from the viewpoint of cost, and the PET bottle can be opened so that it can be quickly and easily inserted. It can be inserted quickly and easily. The above is called three conditions of molding, opening, and insertion.

  However, with regard to the conventional two-fold label, the clearing of the three conditions of molding, opening and insertion has been unsatisfactory. Furthermore, the recent demand for PET bottles such as beverages has been diversified, and it has become difficult to deal with conventional forms. Therefore, recently, in addition to the conventional two folds, two more folds were actively added, and the folds were changed to a total of four (90-degree intervals) creases, which were opened with a suction pad or the like, The method of inserting the bottle or the like has been changed.

  The heat-shrinkable cylindrical label having the four folds is more effective for clearing the three conditions of molding, opening and insertion than the case of the two folds. However, even these four folds are not at a sufficiently satisfactory level. Moreover, one of the recent trends is to reduce the thickness of the label to reduce the cost. However, this thinning makes it more difficult to achieve the three conditions of molding, opening and insertion. Another tendency is to increase the length of the label on the PET bottle. If the length is longer, opening / insertion becomes difficult even if the label is thick. It becomes even more difficult if it gets thinner.

  Therefore, the applicant can clear the above three conditions of molding, opening and insertion at a higher level than a conventional four-fold heat-shrinkable cylindrical label, and the length of the label covering the bottle such as PET. As a problem to find a means for easy opening / insertion even if the label becomes longer and the thickness of the label becomes thinner, the PET bottle 3 is first attached with reference to FIG. The heat-shrinkable tubular film 4 for labels provided with 6, 8 or 10 fold lines 4a in the longitudinal direction has been proposed (Patent Document 1).

Japanese Patent Laying-Open No. 2005-77948

  However, when the thickness of the label is further reduced to about 20 μm to 40 μm, there is a problem that the waist is lost, the waist is shattered, and the attachment to the PET bottle or the like is not finished beautifully, and further improvement has been demanded. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat-shrinkable cylindrical label which has a waist and is improved so as not to be crushed by heat.

  Still another object of the present invention is to provide a method for producing such a heat-shrinkable cylindrical label.

  Still another object of the present invention is to provide a plastic bottle equipped with such a heat-shrinkable cylindrical label.

  This invention is a heat-shrinkable cylindrical label mounted on the side of a container, and includes a heat-shrinkable base film having a left end and a right end. The left end and the right end are overlapped and sealed so that the heat-shrinkable base film forms a tube. On the surface of the tube, there are provided a plurality of projecting portions extending in the longitudinal direction and embossed so as to rise outward from the inner surface.

  The heat-shrinkable tubular film of the present invention is not particularly limited. For example, a single-layer or multilayer film made of a polystyrene resin, a polyolefin resin, a polyester resin, a polyamide resin, a polyvinyl chloride resin, or the like. Can be illustrated.

  More preferably, it is a film made of any one of a polystyrene resin, a polyolefin resin, and a polyester resin.

  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 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 a conjugated diene such as butadiene and isoprene and / or a random block of styrene and a conjugated diene, and has a styrene content of 1 to 50% by mass and a conjugated diene. An elastomer having a content of 99 to 50% by mass.

  One type of polystyrene resin may be used, or a mixture of two or more types may be used.

  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.

  As the polyolefin-based resin, preferably, a random copolymer of ethylene or propylene as a main component and other monomers (olefin, vinyl compound, etc.) copolymerizable therewith, or a polymer containing a cyclic olefin is used. Can be mentioned.

  Examples of the polymer containing a cyclic olefin include (a) a random copolymer of ethylene or propylene and a cyclic olefin (for example, norbornene and its derivatives, tetracyclododecene and its derivatives), and (b) the cyclic olefin. A ring-opening polymer or a copolymer with an α-olefin, (c) a hydrogenated product of the polymer of (b) above, (d) an unsaturated carboxylic acid and its derivative, etc. Examples include graft modified products.

  The polyolefin resin may be one kind or a mixture of two or more kinds.

  It is preferable that 4 to 16 protrusions are provided. The reason why the number is specified up to 16 is that the improvement in the effect is not recognized as much as the difference.

  The interval between the protruding portions may be set as appropriate, but the following is an example.

  Within the circumferential angle of 360 degrees, in the case of 5 a projecting portions, the angle pitch is preferably 50 to 70 degrees, more preferably 55 to 65 degrees, and in the case of eight, preferably 35 to 55 degrees, Is an angle pitch of 40 to 50 degrees, and in the case of 10, the creases are preferably given at an angle pitch of 25 to 45 degrees, and further 30 to 40 degrees.

  The most preferable case is 60 degrees in the case of 6 lines, 45 degrees in the case of 8 lines, and 36 degrees in the case of 10 lines, but the same angle does not continue when sorting by angles other than this angle. As described above, it is better to sort appropriately. (For example, in the case of six, if convex portions are provided at both ends at the same time at the first 50 degrees, then 70 degrees, and then 60 degrees, six convex portions are attached at this angular interval).

  When the thickness of the heat-shrinkable substrate film is 20 μm to 40 μm, it will be crushed if it is not according to the present invention, but it will not be crushed by the present invention.

  According to another aspect of the present invention, a method for producing a heat-shrinkable cylindrical label attached to a side surface of a container includes a step of preparing a long heat-shrinkable base film having a left end portion and a right end portion, and heat shrinkability A step of forming a plurality of projecting portions extending in the longitudinal direction on the surface of the base film and embossed from the inner surface toward the outside; the left end portion and the right end portion; And overlaying and sealing so that the conductive base film forms a tube.

  According to still another aspect of the present invention, a method for producing a heat-shrinkable cylindrical label attached to a side surface of a container includes a step of preparing a long heat-shrinkable base film having a left end and a right end, and the left end And a step of overlapping and sealing the right end portion so that the heat-shrinkable base film forms a tube, and a male mold is placed in the tube, and the female mold is pressed from the outside of the tube. And a step of forming a plurality of projecting portions extending in the longitudinal direction and embossed from the inner surface toward the outer side on the surface of the tube.

  The surface of the tube is provided with a plurality of projecting portions that are longitudinally extended and embossed from the inner surface toward the outer side, so that there is a waist and the waist is not shattered by heat. Become. Also, it can be mounted neatly on PET bottles. In addition, the heat-shrinkable cylindrical label having a conventional 4-fold fold can be opened more easily and quickly, and can be easily inserted into a PET bottle or the like. In particular, even when the thickness of the heat-shrinkable cylindrical label is reduced, the above-described opening / insertion is not difficult, and it is easy to cope with the thickness. In particular, even when the covering length of the label on the PET bottle or the like is longer, the opening / insertion is not difficult, and the covering length can be easily handled.

(A) is the perspective view of the heat-shrinkable cylindrical label which concerns on Example 1, (B) is the top view which looked at the heat-shrinkable cylindrical label which concerns on Example 1 from upper direction. It is the top view seen from the top when a PET bottle is inserted and stood in the heat-shrinkable cylindrical label which concerns on Example 1. FIG. It is a table | surface which shows the relationship between the number of convex parts, and compressive strength. It is a figure which shows the outline of the manufacturing method of the heat-shrinkable cylindrical label which concerns on Example 2. FIG. (A) is the conceptual diagram of the jig | tool which provides the convex part used for the method which concerns on Example 2, (B) is a conceptual diagram of a grooved roll, (C) is a raw material film combining a jig and a roll. It is a figure which shows a mode that the convex part is provided. (A) is a figure which shows the principal part of the method which concerns on Example 3, and is a figure which shows a mode that the convex part is provided on the surface of the tube by the male type | mold and female type | mold which provide a convex part. (B) is a perspective view of the obtained tube. It is a figure which shows the aspect which mounts the conventional heat-shrinkable cylindrical label to a PET bottle. It is a figure which shows the aspect which mounts another conventional heat-shrinkable cylindrical label to a PET bottle.

  The purpose of obtaining a heat-shrinkable cylindrical label with waist and improved so as not to break by heat is embossed on the surface of the tube so that it swells from the inner surface to the outer side, extending in the longitudinal direction of the tube This was realized by providing a plurality of protruding portions. Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1A is a perspective view of a heat-shrinkable cylindrical label according to Example 1, and FIG. 1B is a plan view seen from above.

  1 (A) and 1 (B), the heat-shrinkable cylindrical label 5 attached to the side surface of the container includes a heat-shrinkable base film having a left end portion and a right end portion, and the left end portion and the right end portion. Are stacked and sealed so that the heat-shrinkable base film 5 forms a tube. Reference numeral 2 denotes a seal portion. On the surface of the tube, there are provided a plurality of protruding portions 5a extending in the longitudinal direction and embossed so as to rise outward from the inner surface. In addition, although the shape of the convex part 5a is a rounded triangle in FIG.1 (B), this invention is not limited to this. When viewed from above, not only a triangular shape but also a trapezoidal shape, a quadrangular shape, or a semicircular shape may be used.

  Since a plurality of protruding portions 5a are provided on the surface of the tube and are embossed so as to rise from the inner surface toward the outer side, the PET bottle 3 is formed as shown in the plan view of FIG. Even if it is inserted and stood, the projecting portion plays the role of a pillar and the waist is firm and the standing shape can be maintained. Moreover, even when it heat-shrinks through a heating furnace, a tube does not break down with heat. Also, in the tapered portion at the top of the PET bottle, the projecting portion serves as a pillar, so that there is no folding at the time of contraction, and the taper contracts neatly. As a result, it can be mounted neatly on PET bottles or plastic containers.

  FIG. 3 is a table showing the relationship between the number of protruding portions and the compressive strength. When the number of protruding portions was four, a rapid increase in compressive strength (N) was observed, and it was observed that the effect was saturated from 16 or more.

  The production of the heat-shrinkable film is performed as follows.

  First, the resin is extruded into a film by a melt extrusion method from a T die. This is stretched mainly in the transverse direction using a tenter at a predetermined temperature (depending on the type of resin). Then, it is heat-set (annealed) while being relaxed, cooled and wound up.

  Here, the stretching ratio in the transverse direction (TD direction) is generally 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.

  In the case of a multilayer film, melt extrusion is performed simultaneously from one multi-T die connected to a plurality of extruders, and stretching and heat setting are similarly performed.

  And it prints on the part which becomes an inner surface or an outer surface with the pattern desired for the obtained film, and obtains a raw film.

  Prior to this printing, surface treatment (for example, corona discharge treatment) for improving printability may be performed. In particular, it is desirable to do this when using a polyolefin resin.

  FIG. 4 is a conceptual diagram of the process. Reference numeral 12 denotes an unwinding shaft of the raw film 11. The raw film 11 is wound up to the winding shaft 13 by the guide roller 14 and the nip roller 15. In the middle, the following processing is performed. It is sent between a jig 17 and a grooved roll 18 that give a protruding portion to be described later, and extends in the longitudinal direction on the surface of the original film 11 so as to rise from the jig 17 side toward the grooved roll 18 side. A plurality of protruding portions formed by embossing are formed. Thereafter, a solvent is supplied from the coating nozzle 16 to, for example, the left end portion of the raw film 11. The right end portion is overlapped with the left end portion to which the solvent has been applied by the nip roller 15 and sealed to form a tube.

  FIG. 5A is a conceptual diagram of the jig 17 that provides the projecting portion, and FIG. 5B is a conceptual diagram of the grooved roll 18. With reference to FIG.5 (C), the raw film 11 is pinched | interposed between the jig | tool 17 which provides a convex part, and the roll 18 with a groove | channel, The jig extended in the elongate direction on the surface of the original film 11 A plurality of protruding portions (five in the figure) are formed by embossing from the 17 side (becomes the inner surface) toward the roll 18 side (being the outer surface).

  The film can be easily opened by making a large number of creases, and when the film is opened, its own strength (for example, compressive strength) is increased, and the thickness of the film is further reduced. Even when the length of the label (the length to be covered) is increased, the label can be inserted without being bent when inserted into a PET bottle or the like.

  The present embodiment relates to another method different from the second embodiment. First, a long heat-shrinkable base film having a left end and a right end is prepared, and the left end and the right end are overlapped and sealed so that the heat-shrinkable base film forms a tube. To do. With reference to FIG. 6 (A), a male mold 21 for providing a projecting portion is placed in the obtained tube 5, and both sides are fitted on the female mold 22 corresponding to the projecting portion from the outside of the tube. Hold from. As a result, referring to FIG. 6B, a plurality of protruding portions 5a are formed on the surface of the tube 5 so as to extend in the longitudinal direction and are embossed from the inner surface toward the outside.

  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.

  ADVANTAGE OF THE INVENTION According to this invention, the heat-shrinkable cylindrical label improved so that it may have a waist | lumbar and may not break down by the heating at the time of shrinkage | contraction is obtained.

DESCRIPTION OF SYMBOLS 1 Heat-shrinkable flat film 1a Fold 2 Seal 3 PET bottle 4 Heat-shrinkable cylindrical film 4a for labels Fold 5 Heat-shrinkable cylindrical label 5a Convex part 11 Original fabric film 12 Unwinding shaft 13 Rewinding shaft 14 Guide roller 15 Nip roller 16 Application nozzle 17 Jig 18 Grooved roll 21 Male 22 Female

Claims (6)

A heat-shrinkable cylindrical label attached to the outer periphery of the body of the container,
A heat-shrinkable base film having a left end and a right end;
The left end and the right end are overlapped and sealed so that the heat-shrinkable base film forms a tube,
A heat-shrinkable cylindrical label provided with a plurality of projecting portions extending in the longitudinal direction and embossed from the inner surface toward the outer side on the surface of the tube.   The heat-shrinkable cylindrical label according to claim 1, wherein the protruding portion is provided in a range of 4 to 16 inclusive.   The heat-shrinkable cylindrical label according to claim 1 or 2, wherein the heat-shrinkable substrate film has a thickness of 20 µm to 40 µm.   A plastic bottle in which the heat-shrinkable cylindrical label according to any one of claims 1 to 3 is attached to the outer periphery of the container. A heat-shrinkable cylindrical label manufacturing method to be attached to the outer periphery of the body of the container,
Preparing a long heat-shrinkable base film having a left end and a right end; and
On the surface of the heat-shrinkable base film, a process of forming a plurality of projecting portions extending in the longitudinal direction and embossed so as to rise from the inner surface toward the outside;
A method for producing a heat-shrinkable cylindrical label, comprising: a step of overlaying and sealing the left end portion and the right end portion so that the heat-shrinkable base film forms a tube. A heat-shrinkable cylindrical label manufacturing method to be attached to the side of a container,
Preparing a long heat-shrinkable base film having a left end and a right end; and
Sealing the left end portion and the right end portion so that the heat-shrinkable base film forms a tube; and
A projecting portion formed by inserting a male mold into the tube and holding it with a female mold from the outside of the tube, and being embossed on the surface of the tube so as to rise in the longitudinal direction from the inner surface to the outside. A method for producing a heat-shrinkable cylindrical label comprising a step of forming a plurality of the label.

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