JP2006053455A - Heat sensitive label resistive to curling up - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sensitive label which is used to stick on PET bottles and glass bottles and in particular has the rear surface partly coated with adhesive resin layer strips. <P>SOLUTION: The heat sensitive label is made by coating a thermoplastic resin layer (adhesive resin layer) on its rear surface. This thermoplastic resin layer (15) is not applied to all over the rear surface but applied by forming a laminated line pattern, dot pattern, or spiral pattern on the whole surface. Accordingly, the label does not curl even when heated to stick on a PET or glass bottle. Thus, the labels are stuck anywhere correctly without slanting even when stuck to PET bottles or glass bottles by using a labeler. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a label attached to a glass bottle, a PET bottle, or the like, and more particularly to a heat-sensitive label in which a curl prevention measure is applied by partially applying a resin layer to be attached to the back side of the label.

  Conventional heat-sensitive labels have been coated with a version of "thermoplastic resin + plasticizer" on the back side of the label, dried at low temperatures, and stripped of solvents other than solids to adhere the label. It constitutes a surface. This label is of a type that is heated with a labeler to cause tackiness on the adhesive surface.

  For other types of heat-sensitive labels, a thermoplastic resin is applied to the entire surface by “extruder coating”, “filming and bonding”, or hot melt, etc., and then heated with a labeler to plasticize the adhesive surface. There are things that are labeled in a state.

  However, each of the thermal labels described above has its own problems. For example, the problem of curling due to heat does not generate curl because the coating film is thin, but the thermoplastic resin and plasticizer melt at low temperatures. It develops and causes problems such as blocking.

  Further, as shown in FIG. 5, the label (20) has a general configuration of a base material (20) such as paper or film from the upper layer, a paper peeling prevention layer (22), and an adhesive resin layer (25) on the back of the label. However, because the resin is coated on the entire back surface, curling occurs due to the difference in shrinkage between the base material layer and the adhesive resin layer (25) due to heating with a labeler, and it cannot be applied correctly to the container. Or misalignment is likely to occur.

  Therefore, the present invention has been made to solve the above problems, and is a heat-sensitive label that is attached to a glass bottle, a PET bottle, or the like. In particular, the application of the adhesive resin layer to be attached to the back of the label is partially performed. It provides a thermal label to prevent curling.

Claim 1 in the present invention is
A base material (11) made of paper or a resin film as an upper layer, a paper peeling prevention layer (12) such as a resin film as an intermediate layer, and a thermoplastic resin layer (15) provided on the back surface of the paper peeling prevention layer. It is a heat sensitive label (10), Comprising: The said thermoplastic resin layer is a heat sensitive label with which the anti-curl measure was applied characterized by having applied the partial and arbitrary pattern shape.

Claim 2 is a thermal label to which the curl prevention measure according to claim 1 is applied.
The thermoplastic label (15) is a heat-sensitive label on which a curl prevention measure is applied, characterized in that a line lami coating is applied as a pattern in the flow direction.

Claim 3 is a heat-sensitive label to which the curl prevention measure according to claim 1 is applied.
The thermoplastic label (15) is a heat-sensitive label on which a curl prevention measure is applied, characterized in that dots are applied as a pattern in the flow direction.

Claim 4 is the heat-sensitive label to which the curl prevention measure according to claim 1 is applied,
The thermosensitive label is provided with a curl prevention measure, wherein the thermoplastic resin layer (15) is spirally coated as a pattern in the flow direction.

  The present invention provides a thermosensitive label in which a thermoplastic resin layer (adhesive resin layer) is coated on the back side of the label. With label laminating, dot coating, or spiral coating, label heating to adhere to PET bottles and glass bottles will not cause wrinkles or curls, so label with PET bottles or glass bottles. In the case of sticking, excellent effects such as being able to stick at an accurate position without bending are obtained.

  The best mode of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a laminated structure of a thermosensitive label in one embodiment of the present invention, and FIG. 2 is an explanatory diagram in which a thermoplastic resin layer in the thermosensitive label is coated with a line laminate. FIG. 3 is an explanatory diagram in which the thermoplastic resin layer in the thermal label is subjected to dot coating, and FIG. 4 is an explanatory diagram in which the thermoplastic resin layer in the thermal label is subjected to spiral coating.

  As shown in FIG. 1, the thermosensitive label of the present invention comprises a base material (11) as an upper layer, a paper peeling prevention layer (12) as an intermediate layer, and a thermoplastic resin layer (adhesive resin layer) on the back surface of the paper peeling prevention layer. ) (15) is provided, and the thermoplastic resin layer (adhesive resin layer) (15) is not coated on the entire surface, but is formed into a pattern shape such as line lamination coating, dot coating, or spiral coating. In this case, it is possible to prevent curling of the label without causing shrinkage of the thermoplastic resin layer (adhesive resin layer) even in the heat of the label heating.

  If it demonstrates in detail based on a figure, a base material (11) will consist of paper or a film, and what is necessary is just to be able to form a pattern layer on these surfaces by printing etc. Moreover, rigidity and intensity | strength required in the case of labeling are sufficient. The material is not particularly limited as long as it is obtained. Examples of paper include one-sided art paper, double-sided art paper, imitation paper, bleached craft, aluminum vapor-deposited paper, etc., and the resin film is not particularly limited by polyolefin, polyester, polyamide, polyimide, etc. It is preferable that at least the surface can be printed or can be pasted with printed matter. Other examples include non-woven fabrics that can be used.

  Next, the paper peeling prevention layer (12) is necessary to prevent the tearing of the label and the paper peeling at the time of peeling, which occurs when the strength with the adherend is strong or the base material has a low breaking strength. is there. Further, although not particularly limited, at least “paper peeling prevention layer tensile strength> base material interlayer strength” must be satisfied. Desirable materials are thermoplastic resins such as stretched polypropylene, polyester, and polyamide, and thermosetting resins such as phenol resin and urea resin. Furthermore, it is desirable to use a film having a small heat shrinkage for preventing curling.

  Next, the thermoplastic resin layer (adhesive resin layer) (15) is preferably a thermoplastic resin that can be bonded or temporarily attached to at least an adherend (a container such as a plastic bottle or a glass bottle). That is, it is a resin that adheres to and temporarily adheres to the container, and is not particularly limited as long as it is softened by the heat of the labeler. For example, an ethylene vinyl copolymer, an ethylene methacrylic acid copolymer, an ionomer And rubber resins such as ethylene acrylic copolymer, styrene butadiene, and rubber.

A first embodiment of the present invention will be described with reference to FIG. An appropriate pattern layer is provided on the surface of single-sided art paper 79.1 g / m ² by gravure printing, and a polyethylene terephthalate (PET) film (E5200, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm is bonded to the back surface thereof by dry lamination. Further, the back side of the PET film was subjected to a line lamination pattern with an ethylene vinyl acetate copolymer (EVA) resin (vinyl acetate content 14%) (15). The thickness of the line laminate is 20 μm, the width is 2 mm, and the interval is 2 mm. That is, the coating width ratio with respect to the paper width was 50%.

A second embodiment of the present invention will be described with reference to FIG. An appropriate pattern layer is provided on the surface of single-sided art paper 79.1 g / m ² by gravure printing, and a polyethylene terephthalate (PET) film (E5200, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm is bonded to the back surface thereof by dry lamination. Further, dot pattern coating was performed on the back side of the PET film with an ethylene vinyl acetate copolymer (EVA) resin (vinyl acetate content 14%) (15). The dot size was φ2 mm, the thickness was 20 μm, the intervals were staggered, and the coating area ratio to the paper width was 50%.

A third embodiment of the present invention will be described with reference to FIG. An appropriate pattern layer is provided on the surface of single-sided art paper 79.1 g / m ² by gravure printing, and a polyethylene terephthalate (PET) film (E5200, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm is bonded to the back surface thereof by dry lamination. Further, spiral pattern coating was performed on the back side of the PET film with an ethylene vinyl acetate copolymer (EVA) resin (vinyl acetate content 14%) (15). The thickness of the spiral was 2 mm, the thickness was 20 μm, and the coating width ratio to the paper width was 50%.

  Comparative Example 1 will be described.

An appropriate pattern layer is provided on the surface of single-sided art paper 79.1 g / m ² by gravure printing, and a polyethylene terephthalate (PET) film (E5200, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm is bonded to the back surface thereof by dry lamination. Further, the entire surface of the PET film was extruded with an ethylene vinyl acetate copolymer (EVA) resin (vinyl acetate content 14%) with a thickness of 20 μm.

  Comparative example 2 will be described.

An appropriate pattern layer is provided on the surface of single-sided art paper 79.1 g / m ² by gravure printing, and a polyethylene terephthalate (PET) film (E5200, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm is bonded to the back surface thereof by dry lamination. Further, a delayed tack agent using SBR resin and phthalate ester as a plasticizer was applied to the PET film surface at a coating amount of 10 g / m ² . The coating was performed in the same pattern as in Example 1.

<Test>
The back surface was heated to 120 ° C. with the labeler (width 60 mm × pitch 50 mm) and attached to a PET bottle. The results are shown in Table 1.

As shown in the test results of Table 1, in the conventional products shown in Comparative Examples 1 and 2, convex curls are generated on the horseshoe of the entire EVA coating, and when the labeler is applied, sticking displacement and wrinkles are generated. It can be seen. In the case of delayed tack, even if the coating area is 50%, blocking occurs, so that these comprehensive evaluations are poor.

It is explanatory drawing which shows the laminated structure of the thermosensitive label in one Example of this invention. It is explanatory drawing which applied the thermoplastic resin layer in the said thermosensitive label by the line lami pattern. It is explanatory drawing which applied the thermoplastic resin layer in the said thermosensitive label with the dot pattern. It is explanatory drawing which applied the thermoplastic resin layer in the said thermosensitive label by the spiral pattern. It is explanatory drawing which shows an example of the thermosensitive label by the conventional delayed tack agent.

Explanation of symbols

10, 20 ... Thermal label 11, 21 ... Base material 12, 22 ... Paper peel prevention layer 15, 25 ... Thermoplastic resin layer (adhesive resin layer)

Claims (4)

  A base material (11) made of paper or a resin film as an upper layer, a paper peeling prevention layer (12) such as a resin film as an intermediate layer, and a thermoplastic resin layer (15) provided on the back surface of the paper peeling prevention layer. A thermal label (10), wherein the thermoplastic resin layer is partially and arbitrarily coated in an arbitrary shape, and is provided with a curl prevention measure.   The thermal label according to claim 1, wherein the thermoplastic resin layer (15) is coated with a line laminate in the flow direction.   The thermal label according to claim 1, wherein the thermoplastic resin layer (15) is dot-coated in the flow direction.   The thermal label according to claim 1, wherein the thermoplastic resin layer (15) is spirally coated in the flow direction.

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