JP2006215245A - Heat-shrinkable cylindrical label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-shrinkable cylindrical label whose decorating effect is heightened by being laminated with Japanese paper and also which can be mounted while being shrunk smoothly on an object to be mounted. <P>SOLUTION: In the heat-shrinkable cylindrical label which can be mounted while being shrunk on an object to be mounted, such as a container, a heat-shrinkable film 2 is laminated with Japanese paper 3 whose basis weight is 5 to 35 g/m<SP>2</SP>and whose air permeability is 20 to 500 cc/cm<SP>2</SP>sec. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat-shrinkable cylindrical label on which Japanese paper is laminated.

2. Description of the Related Art Conventionally, a heat-shrinkable cylindrical label formed by forming a heat-shrinkable film into a cylindrical shape has been widely used because it can be easily attached to an attachment such as various containers such as PET bottles. Such a cylindrical label is used not only for the purpose of representing a predetermined display such as a product name, but also for a decorative effect of the product. Japanese paper-like labels have been proposed to enhance the decorative effect of the labels. For example, Japanese Patent Laid-Open No. 2003-321562 discloses a label that has a Japanese paper-like appearance by using a specific heat-shrinkable polyester film. However, even if such a label has a Japanese paper-like appearance, the texture of the fiber does not appear, so it cannot be denied that it is clearly inferior to the appearance of the Japanese paper itself.
In this regard, if Japanese paper is used as a label base material, the appearance of the Japanese paper itself can be shown to the viewer, so that the decoration effect of the label can be significantly enhanced as compared with the above-mentioned Japanese paper appearance alternative means. However, heat-shrinkable labels cannot be constructed with Japanese paper alone, so a heat-shrinkable cylindrical label is produced using a base material in which Japanese paper is laminated and bonded to the heat-shrinkable film in order to utilize the heat-shrinkage of the heat-shrinkable film. It is possible to do.
However, this kind of cylindrical label that is shrink-mounted on a container with a diameter difference such as a PET bottle is intended to secure a certain degree of heat shrinkage in the circumferential direction. The label cannot be attached to the container or the Japanese paper is peeled off from the film.

JP 2003-321562 A

  Then, this invention makes it a subject to provide the heat-shrinkable cylindrical label which can improve a decoration effect by laminating Japanese paper, and can carry out shrink mounting | wearing to a to-be-mounted thing without trouble.

As means for solving the above-mentioned problems, the present invention is a heat-shrinkable cylindrical label that is shrink-mounted on an object to be mounted such as a container, and has a weight per unit area of 5 to 35 g / m ² , aeration. A heat-shrinkable cylindrical label in which Japanese paper having a degree of 20 to 500 cc / cm ² · sec is laminated is provided.
Here, the said air permeability says the value measured according to the fragile form method of JISL1096 (1999).
Such a heat-shrinkable cylindrical label uses a specific Japanese paper with a basis weight of 5 to 35 g / m ² and an air permeability of 20 to 500 cc / cm ² · sec. Can be made to follow. Therefore, there is no problem when the cylindrical label is shrink-mounted on the mounted object.
Moreover, since the Japanese paper itself is laminated on the label base material, a real Japanese paper appearance can be imparted to the label.

  Since the heat-shrinkable cylindrical label of the present invention is laminated with Japanese paper itself, it can give a high-class feeling and can provide a label with a very high decorative effect. Furthermore, since the Japanese paper follows the heat shrinkage of the heat-shrinkable film, the heat-shrinkable cylindrical label of the present invention can be satisfactorily shrink-fitted to an article.

Hereinafter, the present invention will be specifically described with reference to the drawings.
1 and 2, reference numeral 1 designates both side edges 5a and 5b of a label base material 5 formed by laminating and bonding a Japanese paper 3 to the back surface of the heat-shrinkable film 2, and the Japanese paper 3 serves as an inner peripheral surface of the label. Thus, the heat-shrinkable cylindrical label in which the center seal portion 6 is formed by pasting the overlapped portion into a tubular shape is shown.

The label base material 5 is configured to have a heat shrinkage rate of 30% or more in the width direction (circumferential direction in the case of a cylindrical label, the same applies hereinafter) when immersed in warm water of 90 ° C. for 10 seconds, for example. Yes.
Specifically, the heat shrinkable film 2 having the matte layer 4 provided on the surface, the design printing layer 7 provided on the back surface of the film 2, and the back surface of the design printing layer 7 were provided. It consists of a laminated body provided with the adhesive layer 8 and the Japanese paper 3 provided in the back surface of this adhesive layer 8. On the back surface of the one side edge part of the heat-shrinkable film 2, the design printing layer 7, adhesive layer 8. A film exposed portion 9 on which the Japanese paper 3 is not provided has a predetermined width in the longitudinal direction. The cylindrical label 1 is configured by superimposing the film exposed portion 9 on the surface of the other end portion 5b of the label base material 5 and attaching it with a solvent or an adhesive.

  The heat-shrinkable film 2 is a colorless transparent or colored-transparent heat-shrinkable film that can be seen through design printing, and the material thereof is not particularly limited. A film composed of one or a mixture of two or more selected from thermoplastic resins such as styrene resins such as polystyrene and styrene-butadiene copolymers, cyclic olefin resins and vinyl chloride resins, or the like. Examples include laminated films. Among them, it is preferable to use a polyester-based film such as polyethylene terephthalate having a relatively strong contraction force in order to pull the Japanese paper 3 and reliably contract it. A heat-shrinkable film can be obtained by forming a film by a known production method such as a T-die method or an inflation method and stretching the film. The stretching treatment is usually performed by stretching at a temperature of about 70 to 110 ° C. in the width direction by 2.0 to 8.0 times, preferably about 3.0 to 7.0 times. Furthermore, you may perform a extending | stretching process by the low magnification of 1.5 times or less also in the vertical direction (direction orthogonal to the width direction. The following is the same). The obtained film becomes a uniaxially stretched film or a biaxially stretched film slightly stretched in a direction orthogonal to the main stretch direction. The thickness of the film is preferably about 25 to 60 μm, more preferably about 30 to 50 μm.

The heat-shrinkable film 2 has a heat shrinkage rate in the width direction of 30% or more, preferably 40% or more when immersed in warm water of 90 ° C. for 10 seconds, for example. In addition, the heat shrinkage rate in the vertical direction is -3 to 10%, preferably about 0 to 6%.
In this specification, the heat shrinkage rate is the heat shrinkage rate (%) = [{(original length in the width direction (or lengthwise direction)) − (length after immersion in the width direction (or lengthwise direction). )} / (Original length in the width direction (or vertical direction))] × 100.
Furthermore, as the heat-shrinkable film 2, it is preferable to use a film having a shrinkage stress in the width direction of 3 MPa or more when immersed in warm water at 90 ° C.
The shrinkage stress was cut into a rectangular shape with a width of 150 mm and a length of 15 mm, and both ends of the film piece in the width direction were used as chucks for a stress measuring instrument (manufactured by Shimadzu Corporation, trade name: Autograph). It is the maximum shrinkage stress (MPa) generated during holding for 10 seconds (distance between chucks: 100 mm) and dipping in 90 ° C. warm water for 10 seconds.

The matte layer 4 is provided on the surface of the heat-shrinkable film 2 except for the center seal portion 6 by a method such as solid printing of mat ink containing a matting agent such as silica fine particles. However, since the matte layer 4 is provided so that the appearance of the Japanese paper 3 is not impaired by the brightness of the surface of the film 2, the matte layer 4 has a light-transmitting property that allows the laminated Japanese paper 3 to be seen through.
The design print layer 7 is provided with a predetermined display such as a trade name, a pattern, and an explanation in a single color or multicolor printing by a known printing method such as gravure printing. The design print layer 7 is provided by removing a predetermined width (center seal width) from one side edge of the back surface of the heat-shrinkable film 2 in order to secure the film exposed portion 9. In addition, the design printing layer 7 may be partially provided so that a dye is not attached to a portion other than a predetermined display so that the Japanese paper 3 laminated on the back surface thereof can be seen through from the front surface of the label substrate 5. Alternatively, a thin solid print or a gradation print and a predetermined display are printed with a color ink that can be seen through.
The adhesive layer 8 is a layer for laminating and bonding the Japanese paper 3 to the film 2, and, like the design printing layer 7, except for a predetermined width from one side edge of the heat-shrinkable film 2, dry lamination, wet lamination It is provided by applying a known adhesive used in the above. Among them, since the adhesive does not penetrate into the interior of the Japanese paper 3 and the Japanese paper 3 can be prevented from being cured, it is preferable to adhere by dry lamination.

Washi 3 can be said to be a handmade paper made from natural bast long fibers such as cocoon, mitsumata, ganpi, etc. In addition to these cocoons, the invention includes paper in a broad sense obtained by mechanically pulverizing various long-fiber raw materials such as hemp, kenaf, rayon, wood pulp, synthetic fiber, etc. Paper. Among them, it is preferable to use a material fiber slightly protruding from the surface of the paper so that the texture of the material fiber can be clearly shown, such as Yunlong paper or Yunlong paper.
Japanese paper 3 having a basis weight of 5 to 35 g / m ² , preferably 9 to 30 g / m ² is used. If the weight per unit area is less than 5 g / m ² , the Japanese paper may be too thin and tear when laminated to the film 2. On the other hand, if the basis weight exceeds 35 g / m ² , the heat shrinkable film 2 This is because it does not sufficiently follow and shrink with the heat shrinkage. The Japanese paper 3 has a permeability of 20 to 500 cc / cm ² · sec, preferably 50 to 250 cc / cm ² · sec. When the air permeability is less than 20 cc / cm ² · sec, the perforated area is small and there is a possibility that the heat shrinkable film 2 may not sufficiently follow the heat shrinkage, and when the air permeability exceeds 500 cc / cm ² · sec. This is because the adhesive may ooze out on the back surface of the Japanese paper when laminating and bonding.

The heat-shrinkable cylindrical label 1 is used by being shrink-mounted on a body portion of a container such as a PET bottle. Since the cylindrical label 1 of the present invention is composed of a label base 5 in which a heat-shrinkable film 2 is laminated with Japanese paper 3 having a basis weight of 5 to 35 g / m ² and an air permeability of 20 to 500 cc / cm ² · sec. Thus, the cylindrical label 1 having a heat shrinkage rate of 30% or more in the circumferential direction can also be configured. Therefore, it can be satisfactorily attached to a container portion having a large diameter difference from the trunk portion of the container to the shoulder portion. Further, since the Japanese paper 3 is laminated on the label base material 5, the Japanese paper 3 can be seen from the outside of the cylindrical label 1, and the label has a very high decorative effect as compared with a label that artificially displays a Japanese paper-like pattern. 1 can be provided.

  In addition, the layer structure of the cylindrical label 1 of this invention is not restricted to what was illustrated above, For example, as shown to Fig.3 (a), the design printing layer 7, the Japanese paper 3, adhesive, in order from the surface side to a back surface side. The label base material 5 laminated in the order of the agent layer 8 and the heat-shrinkable film 2, as shown in FIG. 5B, the Japanese paper 3, the adhesive layer 8, the heat-shrinkable film 2, and the design print layer 7 in this order. As shown in FIG. 4C, the laminated label base material and both sides of the Japanese paper 3 are sandwiched between the heat-shrinkable films 2 (any one of these films may be a non-heat-shrinkable film). It can also be produced using the label substrate 5. For example, when the label base material 5 in which a non-heat-shrinkable film (non-stretched polyethylene film or the like) is laminated on the back side of the Japanese paper 3 is used, the film comes into contact with the container when it is attached to the container or the like. Therefore, it can be expected to prevent the cylindrical label from spinning around. As such a base material 5, what laminated | stacked polyethylene by extrusion on the back surface of the Japanese paper 3 etc. are mentioned, for example.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.
Examples 1 to 4 and Comparative Example 1
As shown in Table 1, by preparing Japanese paper (Yunlong paper) and rayon paper with different weight per unit area and air permeability, each was sufficiently adhered to a heat-shrinkable film made of polyethylene terephthalate having a thickness of 30 μm by a dry lamination method. A test substrate was prepared.
As this heat-shrinkable film, a film having a heat shrinkage rate of 80% and a shrinkage stress of 6.2 MPa in the width direction of immersion at 90 ° C. in hot water for 10 seconds was used. In addition, the measuring method of a thermal contraction rate and shrinkage stress is as above-mentioned.
The test base materials of Examples 1 to 4 and Comparative Example 1 were cut into a width of 50 cm and a length of 50 cm, respectively, and the thermal shrinkage rate (%) in the width direction after being immersed in 90 ° C. warm water for 10 seconds was measured. .
Further, the end portions on both sides of each test substrate are overlapped and bonded to form a cylinder (the circumference of this cylinder label is about 1.05 times the circumference of the body of the PET bottle to be mounted), which is commercially available Was inserted into a 500 ml PET bottle and exposed to 90 ° C. steam for 10 seconds. The cylindrical label was thermally contracted by about 5% at the trunk of the PET bottle and at most about 25% at the shoulder, and the appearance of the cylindrical label after the mounting was observed. The results are shown in Table 1.

In Table 1, Unryu Paper 1 is made by Marubayashi Paper Co., Ltd., New Sofron M # 90, Unryu Paper 2 is the company's New Sofron M # 140, Unryu Paper 3 is the company's New Sofron M # 200, Unryu Paper 4 is The company's New Sofron M # 300 and Rayon used the company's New Sofron T # 40. Further, the units of the basis weight, the air permeability, and the heat shrinkage rate are g / m ² , cc / cm ² · sec, and%, respectively.
The air permeability was measured according to the fragile method of JIS L 1096 (1999), and measured using a fragile air permeability tester.

  As shown in Table 1, Examples 1 to 4 have a high heat shrinkage rate of a base material laminated with a film and Japanese paper, and after forming into a cylindrical label and mounting on a PET bottle, wrinkles occur on the surface. The appearance was good. On the other hand, in Comparative Example 1, wrinkles and peeling occurred during shrinkage, and the heat shrinkage rate could not be measured, and when molded into a cylindrical label and attached to a PET bottle, wrinkles occurred in the body of the PET bottle, In addition to the generation of wrinkles, the label was not sufficiently adhered to the part.

The perspective view which shows one Embodiment of the heat-shrinkable cylindrical label of this invention. (A) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. (A)-(c) is a partially abbreviate | omitted sectional drawing which shows other embodiment of a label base material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat-shrinkable cylindrical label, 2 ... Heat-shrinkable film, 3 ... Japanese paper, 4 ... Matte layer, 5 ... Label base material, 5a ... One side edge part of label base material, 5b ... Other than label base material Side edge part, 6 ... Center seal part, 7 ... Design printing layer, 8 ... Adhesive layer, 9 ... Film exposed part

Claims (1)

A heat-shrinkable cylindrical label that is shrink-mounted on a mounted object such as a container,
A heat-shrinkable cylindrical label, wherein a Japanese paper having a basis weight of 5 to 35 g / m ² and an air permeability of 20 to 500 cc / cm ² · sec is laminated on a heat-shrinkable film.

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