JPH11273636A - Shrink label for dry battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for mold releasing paper to save the labor required for the work or process of removing the mold releasing paper by providing a heat-sensitive adhesive layer in place of an adhesive on the back of the film of a shrink label used as an outer label wound on the shell of a dry battery and to enhance the efficiency of manufacturing the label, the quality of the label itself, and its stability after it is bonded to the dry battery by specifying the material of the heat-sensitive adhesive. SOLUTION: A shrink label A is made of a thermally shrinking synthetic resin film base 1 provided with a label print layer 3 and a heat-sensitive adhesive layer 2 located on the back of the base 1 and functioning as adhesion at a temperature lower than the temperature at which the base 1 thermally shrinks, and the heat-sensitive adhesive layer 2 is made of a organic solvent type thermally melting sticky adhesive. The thermally melting sticky adhesive contains a polyester polyurethane whose softening point at creep test is 80 to 100 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink label for a dry battery which is wound around the body of the dry battery and used as an outer label.

[0002]

2. Description of the Related Art Conventionally, a dry battery has its body covered with a metal jacket for exterior use. This metal jacket is a laminated material containing metal foil, label printing of metal foil, cutting of metal foil to a predetermined size, curling,
Processing operations such as coupling and tightening (caulking) metal foil at the end of the dry battery are required.

[0003] The outer diameter of the body including the metal jacket of a dry battery is standardized to predetermined dimensions according to Japanese Industrial Standards. However, the performance of the dry battery, such as output voltage and voltage continuity, depends on the content of the drug. The battery performance can be improved by accommodating as much drug amount as possible in a dry battery of the same size.

Therefore, recently, a thin heat-shrinkable shrink film on which a metal has been deposited has been used instead of the above-mentioned metal jacket for the exterior of the body of a dry battery. And heat shrinkage to reduce the labor required for the above-mentioned processing operations, and use a shrink film thinner than the metal foil to increase the amount of drug contents while keeping the outer diameter of the dry cell body constant. It is also useful for improving the performance of dry batteries. On the back side of the shrink film, a pressure-sensitive adhesive layer (adhesive layer) for fixing the film when wound around the body of the dry battery is provided, and the adhesive surface of the pressure-sensitive adhesive layer is generally made of silicone. Release paper having a release surface that has been subjected to release processing using a resin or the like is temporarily bonded to temporarily cover the adhesive surface. Therefore, when the shrink film is wound around the body of the dry battery to be thermally shrunk and used, an operation and a process for removing the release paper from the shrink film have been required.

As means for solving this problem, there is disclosed means using a heat-sensitive adhesive as an adhesive provided on the back surface of a shrink film. The label using this heat-sensitive adhesive is used in a process in which heat is applied to the heat-sensitive adhesive on the back of the label immediately before the label is attached to the dry battery, the heat-sensitive adhesive exhibits adhesiveness, and then wound around the dry battery and applied. You.
However, a general heat-sensitive adhesive called a so-called delayed tack has a property that a plasticizer is activated by heat to exhibit adhesiveness, and the adhesiveness lasts for a relatively long time. Therefore, there is a possibility that the adhesive does not harden even after the label is wound around and adhered to the dry battery, and the label may shift from a predetermined position during the subsequent manufacturing process.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a shrink label to be used as an external label around the body of a dry battery, wherein a heat-sensitive adhesive layer is provided on the back of the film instead of the adhesive. Eliminates the need for release paper, saves labor and process of removing release paper, improves label manufacturing efficiency by specifying the material of the heat-sensitive adhesive, improves the quality of the label itself, and attaches it to dry batteries. The present invention provides a shrink label for a dry battery with improved stability after the battery.

[0007]

According to the present invention, there is provided a heat-shrinkable synthetic resin film substrate, a label printing layer, and a back surface of the heat-shrinkable synthetic resin film substrate having a heat-shrinkable temperature. A shrink label for a dry battery provided with a heat-sensitive adhesive layer that functions to adhere at a low temperature, wherein the heat-sensitive adhesive layer is an organic solvent type hot-melt adhesive. is there.

Further, the present invention provides the shrink label for a dry battery according to the above invention, wherein the organic solvent type hot-melt adhesive contains a polyester polyurethane having a softening temperature of 80 to 100 ° C. in a creep test. This is a shrink label for a dry battery.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shrink label for a dry battery according to the present invention will be described in detail below in accordance with an embodiment.

FIG. 1A is a side sectional view for explaining an embodiment of a shrink label A for a dry battery according to the present invention, and is heat-sensitively bonded to the back surface of a heat-shrinkable synthetic resin film substrate 1 (shrink film). In this case, the agent layer 2 is provided.

As the synthetic resin film substrate 1, a heat-shrinkable film subjected to a uniaxial stretching treatment is used, and at least (70 ° C to 100 ° C, preferably 75 ° C to 10 ° C).
A synthetic resin film that functions to heat shrink when heated (at 0 ° C.) is used.

For example, examples of the material of the substrate 1 include a polyethylene terephthalate film and a polyvinyl chloride film, a polypropylene film and a polyethylene film.

The heat-sensitive adhesive layer 2 is prepared by dissolving an organic solvent type hot-melt adhesive which functions to adhere at a temperature of 70 ° C. or lower, preferably 65 ° C. or lower, into an organic solvent, In a state of being diluted with, one side (back side) of the base material 1 is coated, heated at a temperature not higher than the temperature at which the organic solvent-type hot-melt adhesive is adhered, and dried and solidified. .

The heat-sensitive adhesive used is preferably an organic solvent-type hot-melt adhesive containing polyester polyurethane having a softening temperature of 80 to 100 ° C. in a creep test. When the softening temperature is lower than 80 ° C., the labels provided with the adhesive on the synthetic resin film base material are liable to be blocked, or the label is heated and then applied to a dry battery, and then subjected to a high temperature, and then the adhesive strength is obtained. And the cohesive force tends to decrease. On the other hand, the softening temperature is 100 ° C
If it is above, it is necessary to stick and adhere at a higher temperature when heating and attaching the label to the dry battery, which is not preferable. The heat-sensitive adhesive contains, in addition to the polyester polyurethane, various additives such as a chlorine-based polymer, a tackifier, an epoxy resin, and an inorganic fine powder, a wax, an antioxidant, and a hydrolysis inhibitor. Is also good.

In the present invention, a label printing layer or a metal deposition layer for imparting a metallic luster is provided on the front or back surface of the substrate 1.

The shrink label A for a dry battery according to the present invention.
Method of tightly attaching to the body of dry cell B, dry cell B
And a heat shrinking step of winding the shrink label A around the outer periphery of the body.

First, in the winding and fixing step, a long rolled-up label is cut into unit labels to be used, and a heating temperature of 70 ° C. or less is applied to the back of the label by using an electric heater, hot air, high frequency, ultrasonic wave, or the like. Preferably, the heat-sensitive adhesive layer 2 of the shrink label A is melt-activated by heating to about 65 ° C., and then wound around the outer periphery of the body of the dry cell B in a tubular shape with the heat-sensitive adhesive layer 2 on the inner surface. The winding ends are overlapped (or butted) with each other, and FIG.
Adhesively fix in the state of (a).

In the winding of the shrink label A, the shrink label A is extended outward from both ends of the dry battery B, and is wound so that the stretching direction is in the circumferential direction of the body of the dry battery B.

Next, in the heat shrinking step for the wrapped shrink label A, the entire portion including the portions protruding at both ends of the dry battery B shown in FIG. On the other hand, the heating temperature is 70 ℃ ～ 13
After heating to 0 ° C., the portions protruding from both ends of the dry battery B are brought into close contact with both ends of the dry battery B, as shown in FIG. Attach it tightly.

As described above, in the shrink label A for a dry battery of the present invention, the heating temperature at which the heat-sensitive adhesive layer 2 functions in the winding and fixing step is set to the heating temperature at which the shrink label A performs the heat shrinking function in the heat shrinking step. Since it is set lower, the heating operation in the winding and fixing step of the shrink label A for a dry battery and the heat shrinking step can be performed properly without occurrence of defective products.

The heat-sensitive adhesive layer 2 is formed of an organic solvent-type hot-melt adhesive, and the organic solvent-type hot-melt adhesive has, as its characteristics, a relatively low temperature after coating. It can be dried and solidified in a short time, and solidifies in a relatively short time even after heating and developing adhesiveness after drying and solidifying.
For this reason, when the present adhesive is used as a shrink label for a dry battery, first, in the label manufacturing process, the shrink label substrate 1 is prevented from being accidentally shrunk, warped, or deformed by heating for drying and solidifying the adhesive. . In addition, equipment can be manufactured with a small unit for drying and solidification. on the other hand,
Since the heat-sensitive adhesive is quickly solidified after being wound and fixed around the dry battery in the winding and fixing step, the label is prevented from being shifted from a predetermined position in the next step.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a shrink label for a dry battery according to the present invention will be described in detail with reference to specific embodiments.

<Example 1> FIG. 1 (b) is a side sectional view showing Example 1 of a shrink label A for a dry battery according to the present invention. The label print layer 3 is formed by printing such as a brand name, a decorative design pattern, or a performance display. The label printing layer 3 is placed on the back surface of the base material 1 (the inner side when the shrink label is wound around the dry battery body) so that the label printing layer 3 is not damaged or dropped by external impact or stress.
Is desirably provided. The heat-sensitive adhesive layer 2 is formed on the back surface (one surface) of the substrate 1.

Example 2 FIG. 1 (c) is a sectional side view showing Example 2 of a shrink label A for a dry battery according to the present invention, and shows the back surface of the substrate 1 (substrate 1 and heat-sensitive adhesive layer). 2), and a metal vapor-deposited layer 4 is provided between the layers. As the metal used for vapor deposition, any metal such as iron, copper, nickel, and aluminum can be used. For example, a metal-deposited layer 4 made of aluminum is applied to the back surface of the base material 1 to give silver metallic luster. Further, the heat-sensitive adhesive layer 2 is formed on the metal deposition layer 4 side of the substrate 1.

Example 3 FIG. 2 is a side sectional view showing Example 3 of a shrink label A for a dry battery according to the present invention, in which a yellow ink colored with a transparent yellow dye and After a yellow varnish is applied in advance by printing to form a colored vapor deposition undercoat layer 4a, a gold metal luster is formed by applying a metal vapor deposition layer 4 of aluminum on the yellow vapor deposition undercoat layer 4a. it can. Further, the heat-sensitive adhesive layer 2 is formed on the metal deposition layer 4 side of the substrate 1.

<Embodiment 4> FIG. 3 is a side sectional view showing Embodiment 4 of a shrink label A for a dry battery according to the present invention. As shown in Embodiment 2 (FIG. 1C), FIG. Metallized layer 4 on the back surface of material 1 (between substrate 1 and heat-sensitive adhesive layer 2)
Then, another heat-shrinkable synthetic resin film 5 (shrink film) is bonded via the adhesive layer 6, and the heat-sensitive adhesive layer 2 can be provided on the heat-shrinkable synthetic resin film 5.

<Embodiment 5> FIG. 4 is a sectional side view showing Embodiment 5 of a shrink label A for a dry battery according to the present invention.
An undercoat layer 4a for colored vapor deposition is provided.

[0028]

The shrink label A for a dry battery according to the present invention.
Is a shrink label to be wrapped around the body of a dry battery as an external label, and a heat-sensitive adhesive layer is provided on the back of the film instead of an adhesive, so that a release paper can be made unnecessary. This has the effect of saving labor and work for removing the waste.

The heat-sensitive adhesive layer is formed of an organic solvent-type hot-melt adhesive, and the organic solvent-type hot-melt adhesive is characterized in that it has a relatively low temperature after coating. It can be dried and solidified in a short time, and solidifies in a relatively short time even after heating and developing adhesiveness after drying and solidifying. Therefore, when the present adhesive is used as a shrink label for a dry battery, the shrink label base material 1 is prevented from being accidentally shrunk, warped, or deformed by heating for drying and solidifying the adhesive in the label manufacturing process. In addition, the unit for drying and solidifying can be manufactured with a small facility.
On the other hand, in the winding and fixing step, the label is prevented from deviating from a predetermined position in the next step because the heat-sensitive adhesive immediately solidifies again after being wound and fixed on the dry battery.

[Brief description of the drawings]

FIG. 1 (a) is a shrink label A for a dry battery of the present invention.
2 (b) is a side sectional view for explaining a first embodiment of the dry battery shrink label A of the present invention, and FIG. 3 (c) is a second sectional view of the dry battery shrink label A of the present invention. FIG.

FIG. 2 is a side sectional view illustrating a shrink label A for a dry battery according to a third embodiment of the present invention.

FIG. 3 is a side sectional view for explaining a shrink label A for a dry battery according to a fourth embodiment of the present invention.

FIG. 4 is a side sectional view for explaining a shrink label A for a dry battery according to a fifth embodiment of the present invention.

FIG. 5 (a) is a shrink label A for a dry battery of the present invention.
(B) is a side sectional view for explaining a heat shrinking step of the shrink label A for a dry battery of the present invention and a state in which the label A is densely mounted.

[Explanation of symbols]

 A: Shrink label for dry battery B: Dry battery body 1 ... Heat-shrinkable synthetic resin film base 2 ... Heat-sensitive adhesive layer 3 ... Label printing layer 4 ... Metal deposition layer 4a ... Color deposition undercoat layer 5 ... Heat shrinkability Synthetic resin film substrate 6: Adhesive layer

Claims (2)

[Claims] 1. A heat-sensitive adhesive which functions to adhere to a heat-shrinkable synthetic resin film substrate, a label printing layer, and a back surface of the heat-shrinkable synthetic resin film substrate at a temperature lower than the heat-shrinking temperature of the heat-shrinkable synthetic resin film substrate. A shrink label for a dry battery, comprising: a heat-sensitive adhesive layer, wherein the heat-sensitive adhesive layer is an organic solvent type hot-melt adhesive. 2. The shrink label for a dry battery according to claim 1, wherein the organic solvent type hot-melt adhesive contains a polyester polyurethane having a softening temperature of 80 to 100 ° C. in a creep test.