JPH0625869U - Thermal label - Google Patents

Abstract

(57) [Summary] [Purpose] The above-mentioned water resistance, heat resistance, weather resistance, chemical resistance, storability, cushioning, surface smoothness, which could not be dealt with by paper labels, PET films, PVC films, etc.
Provides a heat-sensitive label that has cleanness, strength, etc., and has paper-like handling (punchability, adhesiveness, elasticity, etc.), writing / printability, and excellent design. There is [Structure] A void-containing synthetic paper 1 is provided on one surface 2 thereof with a heat-sensitive adhesive 3 which is activated by heating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat-sensitive label attached to a package or the like.

[0002]

[Prior art]

 Traditionally, most paper materials have been used as materials for this type of label. However, the paper material label lacks not only water resistance but also weather resistance, surface smoothness, strength, etc., and is easily broken or scratched on the surface, and prints such as patterns disappear due to the scratches and moisture. There was a risk that it would be difficult to see and that the product value would decrease.

Therefore, in many cases, a label made of a plastic material having excellent water resistance is used to compensate for the above-mentioned problems.

[0004]

[Problems to be solved by the device]

 However, in the label of the plastic material, for example, a polyethylene terephthalate (PET) film is rigid and hard to attach due to its high hardness, and bubbles are easily generated on the adhesive surface, and the bubbles are conspicuous. It was

In addition, polyvinyl chloride (PVC) film, polystyrene (PS) film and oriented polypropylene (OPP) film lack heat resistance, and softening deformation and dimensional change are caused by heat when activating the adhesive. Therefore, when a heat-sensitive adhesive such as a delayed tack adhesive or a hot melt adhesive is used as the adhesive, the adhesive strength is weak and it is very difficult to control the heating temperature. I didn't.

The present invention has been made in view of the above-mentioned conventional problems, and the water resistance, heat resistance, weather resistance, and chemical resistance which cannot be dealt with by labels of paper materials, PET films, PVC films, and the like. It has storability, cushioning, surface smoothness, cleanliness, strength, etc., and has paper-like handling (punchability, good adhesiveness, elasticity, etc.) and writing / printing properties. It is an object of the present invention to provide a heat-sensitive label that is equipped and excellent in design.

[0007]

[Means for Solving the Problems]

 The present invention takes the following technical means in order to solve the above problems.

That is, the one feature of the void-containing synthetic paper 1 is that the heat-sensitive adhesive 3 that is activated by heating is provided.

[0009]

[Action]

 Since the thermal label of the present invention uses the void-containing synthetic paper 1, it is excellent in water resistance and cushioning property, the labeling work by machine use is easy, and better printability is obtained.

When a polyester-based synthetic paper is used as the void-containing synthetic paper 1, the heat resistance, weather resistance and chemical resistance are excellent, and the strength (particularly surface strength) is increased and the heat shrinkage rate is high. Of the adhesive 3 does not cause softening deformation and dimensional change at the time of activation or coating of the adhesive 3, and can sufficiently withstand high tension at the time of printing.

Furthermore, since it has excellent heat resistance and a low heat shrinkage ratio, the heat-sensitive adhesive 3 that can be activated by heating can be used as an adhesive, and therefore, a considerably strong adhesive force can be maintained, and a package It can be a label with excellent fit to an adherend such as.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The heat-sensitive label of the present invention, as shown in FIG. 1, is a void-containing synthetic paper 1 containing a large number of fine voids formed inside a film of a stretched film base called a void, and one side 2 thereof. And a heat-sensitive adhesive 3 which is activated by heating and whose tackiness lasts for a certain period of time.

The surface 4 of the void-containing type synthetic paper 1 is provided with a print display portion 5 on which a trademark, a character pattern, etc. are printed, and the surface thereof is coated with a transparent resin 6 for coating. Has been done.

The void is the interface between the main polymer and the particles mixed in the polymer when the adhesive force between the main polymer and the particles mixed in the polymer is weakened against the stretching stress of the unstretched film which is increased by the progress of stretching. Peeling occurs in the film, and voids are formed with the progress of stretching.

The stretching at this time may be uniaxial stretching or biaxial stretching, but voids are generated by biaxial stretching at a temperature of the glass transition point or higher to the melting point of the polymer and heat setting. It is particularly preferable because the rate, the strength of the label, and the heat resistance are improved.

As the main polymer, olefin-based polypropylene (PP), polyester-based PET, or the like is used.

Therefore, the heat-sensitive label according to the present invention is not only excellent in water resistance, weather resistance, and chemical resistance, but also has excellent cushioning properties because it contains voids.

Further, since it is the void-containing synthetic paper 1, it has a low light transmittance, and by containing an organic pigment such as titanium oxide, the light transmittance can be further reduced to 20% or less, and it can be used as a concealment label or a light-shielding label. It can be used.

In particular, the void-containing synthetic paper 1 obtained by using the polyester polymer and biaxially stretched is excellent in lavering suitability by mechanical use because it has little elongation and has appropriate rigidity.

Further, since the polyester-based synthetic paper has heat resistance, a low heat shrinkage rate, and a considerable strength (particularly surface strength), softening deformation and dimensional change are caused when the heat-sensitive adhesive 3 is activated. It is possible to withstand high tension during printing without causing such problems.

Even when PET is used as the polyester-based material, problems with conventional PET films (stiffness and high hardness make sticking difficult, bubbles easily form on the adhesive surface, and The surface smoothness, cleanliness, and heat resistance similar to those of the PET film used conventionally can be maintained, and the specific gravity is considerably low, so that the cost is low.

In addition, for example, when a heat-sensitive label using PET as the polymer is used in a PET bottle, the polymer is excellent in recyclability because it is made of the same kind of material.

As the heat-sensitive adhesive 3, a delayed tack adhesive or a hot melt adhesive is used, and in particular, the delayed tack adhesive is not tacky at room temperature on the adhesive surface after coating and drying. By heating, the crystalline solid plasticizer softens the polymer to generate adhesive force, and the adhesive force can be maintained for a certain period of time for several hours to several days after cooling. In addition to being obtained, it can be excellent in fitability to an adherend such as a package.

Therefore, when attaching the heat-sensitive label of the present invention to an adherend such as a package, it is sufficient to heat 3 parts of the heat-sensitive adhesive of the heat-sensitive label until the activation. The non-sticky material eliminates the need for release paper, unlike traditional pressure sensitive adhesives.

The activation temperature of the heat-sensitive adhesive 3 is preferably 60 ° C. to 120 ° C.

[0027]

[Effect of device]

 The heat-sensitive label of the present invention is provided with a heat-sensitive adhesive that is activated by heating on one side of the void-containing synthetic paper, so it has excellent water resistance and cushioning properties as well as excellent labeling suitability by machine use. , Better printability is obtained.

When a polyester-based synthetic paper is used as the void-containing synthetic paper, it has excellent heat resistance, weather resistance, and chemical resistance, and increases strength (particularly surface strength) and heat shrinkage. The decrease becomes clear, softening deformation and dimensional change do not occur when the heat-sensitive adhesive is activated by heating, and high tension can be sufficiently endured during printing.

Furthermore, since a heat-sensitive adhesive that can be activated by heating is used as the adhesive, it is possible to maintain a fairly strong adhesive force and to provide a label excellent in fit to an adherend such as a package. obtain.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Void-containing synthetic paper 3 Heat-sensitive adhesive property 5 Printed display 5 6 Coating treatment

Claims (2)

[Scope of utility model registration request] 1. A heat-sensitive label comprising a void-containing synthetic paper 1 provided on one surface 2 thereof with a heat-sensitive adhesive 3 which is activated by heating. 2. The heat-sensitive label according to claim 1, wherein the void-containing synthetic paper 1 is a polyester synthetic paper.