JP2013195740A - Heat-shrinkable cylindrical label and method of manufacturing the same, and container with label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To principally provide a heat-shrinkable cylindrical label that is improved to have neither sink marks nor wrinkles.SOLUTION: An upper part of the reverse side of a center part 10 of a heat-shrinkable base film is coated with spots 13 of a heat-sensitive adhesive at intervals in a shrinking direction. Upper parts of the reverse side of one end 11 and the other end 12 are also coated with spots 14 of a heat-sensitive adhesive at intervals in the shrinking direction. While the base film is folded flatly at two fold parts 9a and 9b, the respective spots 13 and 14 are parallel in an array in the shrinking direction without overlapping in a projection of a cylindrical label in a thickness direction.

Description

  The present invention generally relates to a heat-shrinkable cylindrical label having an inner surface coated with a heat-sensitive adhesive. More specifically, the present invention is improved so that the inner surfaces of a cylindrical label folded into a flat shape do not adhere to each other. Related to heat-shrinkable cylindrical labels. The present invention also relates to a method for producing such a heat-shrinkable cylindrical label and a labeled container to which such a label is attached.

  The heat-shrinkable cylindrical label is formed in a tube shape after joining both ends of the label base material on which the printed layer is formed on the inner surface side of the heat-shrinkable film made of synthetic resin, and then folded into a flat shape. It is wound into a roll shape, cut into a predetermined length while being sequentially fed out by an automatic mounting device or the like, and then opened into a cylindrical shape to be externally fitted to the mounted body.

  As a to-be-mounted body, the container made from a synthetic resin shape | molded by the cup shape is mentioned, for example. As shown in FIG. 5 (A), the container is formed in a tapered shape in which the body portion 2 of the container 1 gradually decreases in diameter toward the bottom portion 3, so that the cylindrical label 4 covered on the container 1 is heated. When shrinking, the cylindrical label 4 is likely to be displaced downward from the container 1 due to the difference in shrinkage rate, and is likely to fall off after being attached. Therefore, conventionally, when the heat-sensitive adhesive 5 is applied to the inner surface of the upper opening end of the cylindrical label 4 by gravure printing or the like and the cylindrical label 4 is thermally contracted, the heat-sensitive adhesives 5a and 5b are used. This prevents the cylindrical label 4 from being displaced.

  Here, as the heat-sensitive adhesive, a hot-melt adhesive or a delayed tack adhesive is used. These adhesives do not have adhesiveness at room temperature, and exhibit adhesiveness when heated. However, depending on the storage state, the adhesiveness of the heat-sensitive adhesive may occur, and in this case, the inner surface of the cylindrical label folded in a flat shape adheres to each other so that the opening operation becomes difficult. Can happen. In particular, the occurrence of “blocking” becomes significant when the application parts of the heat-sensitive adhesive are in contact with each other.

  FIG. 5B shows a conventional cylindrical label 4 in a folded state that solves this problem. FIG. 5C is a cross-sectional view taken along the line CC in FIG. The cylindrical label 4 is formed in a cylindrical shape by joining both end portions of a square heat-shrinkable film. Heat sensitive adhesives 5a and 5b are applied to the inner side of the upper opening end of the label substrate 6 at regular intervals in the circumferential direction, and the label substrate 6 is folded in a flat shape and the heat sensitivity of one surface is applied. The adhesive 5a and the heat-sensitive adhesive 5b on the other surface are not opposed to each other.

  However, in the conventional cylindrical label 5, as shown in FIG. 5C, the distance L between the heat-sensitive adhesive 5a and the adjacent heat-sensitive adhesive 5a and the heat-sensitive adhesive 5b and the adjacent heat-sensitive adhesive. The space L of 5b is wide, and there is a space in the space L where another heat-sensitive adhesive can be applied. For this reason, the total application length of the heat-sensitive adhesives 5a and 5b on the entire circumference of the label substrate 6 is reduced, so that the adhesive strength is weak, and the cylindrical label 4 is dragged downward or twisted in the lateral direction. If an excessive force is applied, the cylindrical label 4 may be easily peeled off from the container 1.

  Further, since the heat-shrinkable film has a property of shrinking at a constant rate in the vertical and horizontal directions, it does not matter where the heat-sensitive adhesives 5a and 5b are applied, but refer to FIG. 5 (A). When the heat-sensitive adhesives 5a and 5b are not applied, the upper edge (region A) of the label base 6 is excessively shrunk downward to cause “sinking”, which impairs the aesthetic appearance of the container. Become.

  In order to solve such a problem, in Patent Document 1, referring to FIG. 6A, the heat-sensitive adhesive 5a is adjacent to the upper step portion of the upper opening end portion of the label base material 6 in the upper and lower sides. Provided at predetermined intervals in a zigzag manner on the inner lower step. In addition, the heat-sensitive adhesive 5b is applied in a staggered manner toward the circumferential direction of the label base 6 so that the phases of the upper and lower stages are shifted, that is, refer to FIG. Thus, a technique is proposed in which coating is performed in two rows of an upper stage and a lower stage, and no “sinking” occurs.

JP 2002-68150 A

  However, even in the technique disclosed in Patent Document 1 described above, with reference to FIG. 6B, there is a gap between the application portion of the first-stage heat-sensitive adhesive 5a and the application portion of the adjacent heat-sensitive adhesive 5a in the circumferential direction. In some cases, it is too open, and a difference in shrinkage ratio occurs between the coated portion and the non-coated portion (gap portion 22), wrinkles are formed, and the aesthetic appearance may be impaired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an improved heat-shrinkable cylindrical label which does not cause sink marks and wrinkles.

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

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

  The present invention is a heat-shrinkable cylindrical label attached to the outer periphery of a body portion of a container, and includes a heat-shrinkable base film having one glue margin and the other glue margin. The heat-shrinkable base film is divided into a central portion and one end portion and the other end portion sandwiching the same from both sides by two folds extending in a direction orthogonal to the shrinking direction. The heat-shrinkable base film is folded in a flat shape at the two fold portions so as to be cylindrical, and the one adhesive margin is overlapped and bonded to the other adhesive margin. On the upper part of the back surface of the central part, a heat-sensitive adhesive is applied in a spot shape with a space in between in the shrinking direction. A heat-sensitive adhesive is also applied to the upper portion of the back surface of the one end portion and the other end portion so as to be aligned in a contracting direction in a spot shape at intervals. The shape and position of the spot of the heat-sensitive adhesive provided at the one end and the other end and the spot of the heat-sensitive adhesive provided at the center are folded flat at the two folds. In this state, the projections in the thickness direction of the cylindrical label are selected so that the spots of the heat-sensitive adhesive are arranged in a line in the contraction direction without overlapping each other. .

  As the base film, a plastic film having heat shrinkability is used. Examples of the material for the plastic film include polyester resins, styrene resins (such as styrene-butadiene copolymers), polyolefin resins (such as polyethylene and polypropylene), polyvinyl chloride, and polyvinylidene chloride. Preferably used. The polyester-based resin includes various polyesters composed of a dicarboxylic acid component and a diol component. As the polyester-based resin, terephthalic acid and ethylene glycol are used as the main components of the dicarboxylic acid component and the diol component, respectively, and dicarboxylic acids such as isophthalic acid, phthalic acid, adipic acid, sebacic acid, and naphthalenedicarboxylic acid are used as copolymerization components. A copolyester using a diol component such as acid, diethylene glycol, neopentyl glycol, polyalkylene glycol, 1,4-cyclohexanedimethanol is preferably used.

  Examples of the styrenic resin include all resins having styrene as one of the constituent elements, such as polystyrene, impact-resistant polystyrene, graft-type impact-resistant polystyrene, styrene-conjugated diene block copolymer, and 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 method for producing a heat-shrinkable cylindrical label according to another aspect of the present invention includes a step of preparing a heat-shrinkable base film having one glue margin and the other glue margin, and the heat-shrinkable base film, Along the two folds extending in the direction orthogonal to the shrinking direction, the center part is folded flatly so as to be divided into one end part and the other end part sandwiching it from both sides, and the one adhesive margin is the other. A step of superimposing and adhering to the paste margin. As the heat-shrinkable base film, a heat-sensitive adhesive is applied to the back surface of the center portion in a spot-like manner with a gap in the shrink direction, and also on the back surfaces of the one end portion and the other end portion. The heat-sensitive adhesive is applied in the contraction direction in the form of spots at intervals, and the spots of the heat-sensitive adhesive provided at the one end and the other end and the center are provided. With the shape and position of the spot of the heat-sensitive adhesive folded in a flat shape at the two folds, the spots of the heat-sensitive adhesive overlap each other in the projection in the thickness direction of the cylindrical label. Instead, a heat-shrinkable film selected so as to be aligned in a line in the shrinking direction is used.

  The labeled container of the present invention includes, for example, beverages such as tea, coffee, tea, water, soft drinks, carbonated beverages and juices; sakes such as sake and wine; liquid detergents; soy sauce, mirin, noodle soup, oil, etc. It can be used as a container for seasonings.

  According to the present invention, since the interval between the heat-sensitive adhesives provided in the upper part can be shortened, there is an effect that sinks and wrinkles do not occur, and that an excellent aesthetic container is provided.

(A) is a developed view of a heat-shrinkable cylindrical label attached to the outer periphery of the body of the container according to Example 1, (B) is a plan view when folded and overlapped with a fold, (C) is sectional drawing which follows the CC line in FIG. 1 (B), (D) is a conceptual diagram when it mounts | wears with a container. It is a figure which shows the method to manufacture the heat-shrinkable cylindrical label based on Example 2 of this invention. (A) is an expanded view of the heat-shrinkable cylindrical label with which it mounts on the outer periphery of the trunk | drum of a container based on Example 3, (B) is a top view when it folds and it overlaps with a crease | fold. (A) is a development view of a heat-shrinkable cylindrical label attached to the outer periphery of the body part of the container according to another modification of Example 3, and (B) is a case where it is folded and overlapped by a fold. It is a plan view It is a figure explaining the conventional cylindrical label. It is a figure explaining the further conventional cylindrical label.

  In order to obtain a heat-shrinkable cylindrical label improved so as not to cause sink marks and wrinkles, the cylindrical label is projected in the thickness direction while being folded flat at two folds. In this example, the spots of the heat-sensitive adhesive were arranged in a line in the shrinking direction without overlapping each other. Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same parts are denoted by the same reference numerals, and the description thereof will not be repeated.

  FIG. 1A is a development view of a heat-shrinkable cylindrical label attached to the outer periphery of the body part of the container according to Example 1, and FIG. 1B is a plan view when folded and folded on a fold. FIG. 1C is a cross-sectional view taken along line CC in FIG. 1B. FIG. 1D is a conceptual diagram when mounted on a container.

  With reference to FIG. 1 (A), the heat-shrinkable cylindrical label is provided with a heat-shrinkable base film 8 made of a polyester-based resin having one glue margin 7a and the other glue margin 7b. The heat-shrinkable base film 8 is divided into a central portion 10 and one end portion 11 and the other end portion 12 sandwiching the same from both sides by two fold lines 9a and 9b extending in a direction orthogonal to the shrinking direction. On the upper part of the back surface of the central portion 10, spots 13 of a heat-sensitive adhesive formed of a hot-melt adhesive or a delayed tack adhesive are applied side by side in the shrinking direction at intervals. A spot 14 of the heat-sensitive adhesive is also applied to the upper part of the back surface of the one end part 11 and the other end part 12 so as to be arranged in the contraction direction with a space therebetween.

  Referring to FIGS. 1B and 1C, the heat-shrinkable base film 8 is folded in a flat shape at two crease portions 9a and 9b so that it becomes cylindrical, and one adhesive margin 7a is replaced with the other. It is bonded or sealed to the adhesive margin 7b.

  Referring to FIGS. 1B and 1C, the heat-sensitive adhesive spot 14 provided at one end 11 and the other end 12 and the heat-sensitive adhesive spot 13 provided at the central portion 10 are shown. The shape and position are folded in a flat shape at the two crease portions 9a and 9b, and in the projection in the thickness direction of the cylindrical label, the spots 13 and 14 of the heat-sensitive adhesive do not overlap each other. It is chosen to be aligned in a line in the shrinking direction.

  With reference to FIG. 1 (D), when it is attached to a container and thermally contracted, the spots 13 and 14 of the heat-sensitive adhesive are aligned in a line at short intervals above the label. The spot 14 of heat sensitive adhesive is located on the back side and does not appear in the drawing. Since the gap between the adjacent heat-sensitive adhesive spots 13 and 14 provided in the upper part is narrow, sinks and wrinkles do not occur as in the prior art.

  FIG. 2 is a diagram showing a process for producing a heat-shrinkable cylindrical label according to the present invention. With reference to FIG. 2 (A), the film roll 15 formed by winding up the base film 8 which has one glue margin 7a and the other glue margin 7b is prepared. This base film 8 is a heat-shrinkable base film shown in FIG. The base film 8 is taken out from the film roll 15, and the bonding adhesive 16 is applied to the back surface of one glue margin 7a. The bonding adhesive 16 is supplied from the adhesive liquid reservoir 17 through the metering pump 18 and from the coating nozzle 19 to the back surface of one glue margin 7 b of the base film 8. The bonding adhesive 16 may be a sealing solvent.

  At this time, it is desirable to use tetrahydrofuran as the organic solvent for sealing. Alternatively, it is also possible to add a small amount of an insoluble solvent such as n-hexane. Furthermore, instead of tetrahydrofuran, an organic solvent such as 1,3-dioxolane, acetone, methyl ethyl ketone, or the like can be used.

  The coating nozzle 19 is disposed on the rotating support base 20 so as to sandwich the base film 8 therebetween.

  Although not shown, an extension brush for extending the applied adhesive is provided in front of the application nozzle 19. The bonding adhesive 16 is applied so that the seal width is 4 ± 1 mm.

  With reference to FIG. 2 (B), the base film 8 is bent into a tube shape further forward in the advancing direction a of the base film 8, and the other side of the adhesive margin 7 b of the base film 8 is placed on the other side. The surface of the adhesive allowance 7a is overlapped, and both are pressure-bonded to be bonded. This crimping is performed by inserting between two rollers 21 and 21 rotating in opposite directions.

  The bonded base film 8 is wound up to form a product roll. When the finished product roll is set in a label mounting machine, cut into cylindrical labels one by one, and mounted on the body of a container such as a PET bottle, a PET bottle with a cylindrical label is obtained.

  According to the present embodiment, referring to FIG. 1C and FIG. 2B, the adhesive spots 13 and 14 applied to the inner surface of the tube face each other in a state of being bent flat. Since the spots to be touched do not come into contact with each other, so-called “blocking” in which the inner surfaces of the cylindrical labels folded in a flat shape adhere to each other and the opening operation becomes difficult does not occur.

  Fig. 3 (A) is a development view of the heat-shrinkable cylindrical label attached to the outer periphery of the body portion of the container according to Example 3, and Fig. 3 (B) is a plan view when folded and overlapped with a fold. FIG. Even in the pattern of the spots 13 and 14 formed by a combination of shapes in which one of the two parallel lines constituting the rectangle and the “U” is directed in the opposite direction, the patterns are opposed to each other in a state of being folded flat. Since the spots to be touched do not come into contact with each other, so-called “blocking” in which the inner surfaces of the cylindrical labels folded in a flat shape adhere to each other and the opening operation becomes difficult does not occur.

  FIG. 4A is a development view of the heat-shrinkable cylindrical label attached to the outer periphery of the body of the container according to another modification of Example 3, and FIG. It is a top view when match | combining. Even in the pattern of the spots 13 and 14 composed of a combination of such a rectangular shape with a hole and a rectangular size that fits into the hole, the spots facing each other do not come into contact with each other in a folded state.

  In addition, the shape of the spot is not limited to the above embodiment, and each of the heat-sensitive adhesives in the projection in the thickness direction of the cylindrical label in a state where the spot is folded flat at the two fold portions. Any spot can be used as long as the spots do not overlap each other and are arranged in a line in the shrinking direction.

  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 cylindrical label according to the present invention, the so-called “blocking” in which the inner surfaces of the cylindrical label folded in a flat shape adhere to each other and the opening operation becomes difficult does not occur. In addition, sinks and wrinkles do not occur.

DESCRIPTION OF SYMBOLS 1 Container 2 trunk | drum 3 bottom part 4 cylindrical label 5a, 5b heat-sensitive adhesive 6 label base material 7a, 7b adhesive margin 8 heat-shrinkable base film a base material film advancing direction 9a, 9b crease 10 center part 11 one side End portion 12 Other end portion 13, 14 Spot of heat-sensitive adhesive 15 Film roll 16 Adhesive for bonding 17 Adhesive liquid reservoir 18 Metering pump 19 Application nozzle 20 Support base 21 Roller 22 Gap portion

Claims (3)

A heat-shrinkable cylindrical label attached to the outer periphery of the body of the container,
A heat-shrinkable base film having one adhesive margin and the other adhesive margin;
The heat-shrinkable base film is divided into a center part and one end part and the other end part sandwiching it from both sides by two folds extending in a direction orthogonal to the shrinking direction,
The heat-shrinkable base film is formed into a cylindrical shape, is folded in a flat shape at the two crease portions, and the one adhesive margin is overlapped with the other adhesive margin and bonded,
In the upper part of the back surface of the central part, a heat-sensitive adhesive is applied in a contracted direction in a spot shape at intervals,
A heat-sensitive adhesive is also applied to the upper part of the back surface of the one end part and the other end part in a contracted direction in a spot shape at intervals.
The shape and position of the spot of the heat-sensitive adhesive provided at the one end and the other end and the spot of the heat-sensitive adhesive provided at the center are folded flat at the two folds. In this state, in the projection in the thickness direction of the cylindrical label, the spots of the heat-sensitive adhesive are selected so as to be aligned in a line in the contraction direction without overlapping each other. Heat-shrinkable cylindrical label.   A container equipped with the heat-shrinkable cylindrical label according to claim 1. Preparing a heat-shrinkable base film having one adhesive margin and the other adhesive margin;
The heat-shrinkable base film is folded in a flat shape along two creases extending in a direction orthogonal to the shrinking direction so as to be divided into a central part and one end part and the other end part sandwiching the center part from both sides. And a method of manufacturing a cylindrical label comprising the step of superposing and bonding the one adhesive margin to the other adhesive margin,
As the heat shrinkable base film,
On the back surface of the central part, a heat-sensitive adhesive is applied side by side in the contraction direction in a spot shape with an interval,
A heat-sensitive adhesive is also applied to the back surface of the one end and the other end along the contraction direction in a spot shape with an interval between them,
The shape and position of the spot of the heat-sensitive adhesive provided at the one end and the other end and the spot of the heat-sensitive adhesive provided at the center are folded flat at the two folds. In such a state, in the projection in the thickness direction of the cylindrical label, a heat-shrinkable film selected so that the spots of the heat-sensitive adhesive do not overlap each other and are aligned in a line in the shrinking direction is used. A method for producing a cylindrical label characterized by the above.