JPH08164971A - Roll-like two sided pressure-sensitive adhesive tape - Google Patents

Abstract

PURPOSE: To provide a roll-like two sided pressure-sensitive adhesive tape which is prevented from a lowering in its adhering function caused by the dimensional change of the release paper resulting from moisture absorption at the time of a transportation or storage in the rainy season or in a hot and humid hold of a ship. CONSTITUTION: In a two sided pressure-sensive adhesive tape having a thickness of at least 50μm, a moisture absorptive release paper has a release agent coated directly on its base paper material and a pressure-sensitive adhesive layer, together with this release paper, is wound around itself. The aforesaid tape is subjected to shrink packaging with a polyethylene film having a density of 0.88-0.941g/cm<3> .

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a roll-shaped double-sided adhesive tape.

[0002]

2. Description of the Related Art There is an application of a double-sided pressure-sensitive adhesive tape, in which a double-sided pressure-sensitive adhesive tape is attached to an adherend such as a nameplate in a state where a release paper is laminated on one side and punched into a predetermined shape.

However, in the double-sided pressure-sensitive adhesive tape, the release paper wound on the pressure-sensitive adhesive layer surface while being stored or processed absorbs moisture, and as a result, the pressure-sensitive adhesive layer surface and the release paper are separated by the dimensional change of the paper. There is a small gap between them, and in a remarkable case, there is a phenomenon that wrinkles are formed on the release paper or the adhesive surface.

When such a double-sided pressure-sensitive adhesive tape is attached to a metal plate such as the above-mentioned name plate with release paper laminated on one side, a fine gap is formed between the metal plate and the double-sided pressure-sensitive adhesive tape.
The adhesive surface that appears when the release paper is peeled off forms a fine uneven surface, and when a metal plate such as a nameplate is attached to an object such as a machine or article, its adhesive strength decreases and peels off during transportation or use. There was a problem such as doing.

Conventionally, for the purpose of protecting the pressure-sensitive adhesive tape from contamination such as dust during storage, display, use, etc., the roll of the pressure-sensitive adhesive tape is appropriately packaged on its outside with a wrapping material or dozen. The shrink film is also packaged, for example, in Japanese Patent Laid-Open No. 5-154905, a heat-shrinkable tube in which a plurality of coil-wound articles are arranged side by side in the axial direction at predetermined intervals, and cut lines in broken lines are formed in advance over the entire circumference. Is located at the interval of the coiled article, covered on the outer periphery of the coiled article, then heat-shrinks the heat-shrinkable tube, and cuts this tube from the notch by its shrinkage stress. Then, a heat shrink wrapping method for coil wound articles is described in which the outer peripheral surface and both end surfaces of each coil wound article are pressure bonded.

However, the heat-shrinkable package of the coil-wound article described in the above publication is intended only to protect the adhesive tape from dust and other contamination, and the release paper of the double-sided adhesive tape described above is used. There is neither the idea of ensuring the attachment of a metal plate such as a nameplate by preventing the absorption of moisture, nor its function.

For the purpose of solving the above-mentioned problems, a method has been attempted in which the release paper is made to absorb moisture at the time of production of the double-sided adhesive tape, but the release paper absorbs moisture at the time of production at a level of 2-3% at most. Even when extreme conditions are selected, the moisture absorption of the release paper is only about 7%, while the saturated moisture absorption of the release paper at 90% RH is as high as 15%. The method of preliminarily absorbing moisture in the pattern paper does not lead to the solution of the above problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to solve the above problems, and to transport and store the cargo in a rainy season or in a hot and humid cargo hold. Another object is to provide a roll-shaped double-sided pressure-sensitive adhesive tape which does not deteriorate the performance of the pressure-sensitive adhesive tape due to dimensional change of the release paper due to moisture absorption.

[0009]

[Means for Solving the Problems]

According to the present invention, a double-sided pressure-sensitive adhesive tape in which a hygroscopic release paper obtained by directly applying a release agent to a paper base material is laminated and wound on the pressure-sensitive adhesive layer has a thickness of 50 μm or more, and a density of 50 μm or more. A gist of the present invention is a roll-shaped double-sided pressure-sensitive adhesive tape, which is shrink-wrapped with a 0.88 to 0.941 g / cm ³ polyethylene film.

The polyethylene film used in the present invention has a thickness of 50 μm or more and a density of 0.91 to 0.91.
The type is not particularly limited as long as it is 0.941 g / cm ³ , but, for example, low density polyethylene or linear low density polyethylene is blown up to about 2 to 4 by an inflation molding method. It may be a polyethylene film which shrinks by 60% in the longitudinal direction and about 30% in the lateral direction, and may be an inflation molding method or a T film.
The polyethylene film formed by the die forming method may be, for example, a polyethylene film which is stretched by a roll stretching method to about 2 to 3 times and contracted by 70% in the longitudinal direction and 0% in the transverse direction. Of course, it may be a biaxially stretched polyethylene film. Good.

The thickness of the polyethylene film is 50 μm
If it is less than m, the release paper of the double-sided pressure-sensitive adhesive tape that is shrink-wrapped may absorb moisture when placed in a hot and humid environment, resulting in dimensional change of the release paper and impairing the performance of the double-sided pressure-sensitive adhesive tape. , The double-sided adhesive tape applied is generally 100
Since it is a comparatively heavy object with a width of 0 to 1300 mm and a diameter of 180 to 250 mm, it does not satisfy the mechanical strength required for transportation.

The density of the polyethylene film is 0.8
The reason for limiting to the range of 8 to 0.941 g / cm ³ is that a polyethylene film having a density higher than this is satisfactory in moistureproof performance, but it is difficult to handle such as collapse of load when stacked in multiple stages as a packaging material. by.

The base material of the release paper used in the present invention is composed of a simple material such as high-quality paper, glassine paper, kraft paper, etc., and polyethylene film laminated paper, polyethylene coated paper, etc. are specially added to these base materials. It does not include the moisture-proof paper. The release agent layer provided on the release paper substrate is not particularly limited, but for example, a release agent layer made of a silicone resin is preferably used.

[0015]

The roll-shaped double-sided pressure-sensitive adhesive tape of the present invention is a double-sided pressure-sensitive adhesive tape in which a release paper having a releasable coating formed on a hygroscopic paper is wound on the pressure-sensitive adhesive layer surface with a thickness of 50.
μm or more and a density of 0.88 to 0.941 g / cm ³
Since it is shrink-wrapped with the polyethylene film of, it is possible to use relatively inexpensive release paper base materials such as high-quality paper, glassine paper, and kraft paper that are commonly used, and even when placed in a hot and humid environment, It is possible to provide a roll-shaped double-sided adhesive tape which does not absorb moisture and can be handled as a package which is free from the risk of load collapse during transportation or storage.

[0016]

Embodiments of the present invention will be described below.

Example 1 Double-sided adhesive tape (double tack tape # 570, Sekisui Chemical Co., Ltd., 1300 mm width, 2
20 mmφ) was formed into a polyethylene having a density of 0.935 g / cm ³ (manufactured by Mitsui Petrochemical Co., Ltd.) by an inflation method at a blow-up ratio of 3 to a thickness of 100 μm.
A polyethylene film having a heat shrinkage ratio of 60% in the lengthwise direction and 30% in the widthwise direction was wound in a bowl shape, heat-sealed on the three sides having openings, and tightly shrink-wrapped through a shrinking tunnel to obtain a roll-shaped double-sided adhesive tape.

(Examples 2 and 3), (Comparative Examples 1 and 2) The films shown in Table 1 were used and shrink-wrapped in the same manner as in Example 1 to obtain a roll-shaped double-sided adhesive tape.

The water content of the release paper of the roll-shaped double-sided pressure-sensitive adhesive tapes obtained in the above Examples and Comparative Examples and 30%
The water content of the release paper of the double-sided pressure-sensitive adhesive tape exposed to an environment room of 80 ° C and 80% RH for 7 days was measured by an infrared spectrum method.
In addition, the surface state of the release paper of the roll-shaped double-sided pressure-sensitive adhesive tape after the above environmental test was visually observed to check whether wrinkles were generated. Table 1 shows the water content of the release paper and the observation result of the surface.
It was shown to.

[0020]

[Table 1]

[0021]

EFFECTS OF THE INVENTION Since the roll-shaped double-sided pressure-sensitive adhesive tape of the present invention is constructed as described above, it is possible to use a relatively inexpensive release paper base material such as high-quality paper, glassine paper and kraft paper which are generally used. And, even if placed in a hot and humid environment,
It is possible to provide a roll-shaped double-sided adhesive tape which does not absorb moisture and can be handled as a package which is free from the risk of load collapse during transportation or storage.

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Claims (1)

[Claims] 1. A double-sided pressure-sensitive adhesive tape in which a hygroscopic release paper having a release agent directly applied to a paper base material is wound on a pressure-sensitive adhesive layer surface with a thickness of 50 μm or more and a density of 0. 88
A roll-shaped double-sided pressure-sensitive adhesive tape, which is shrink-wrapped with a polyethylene film of up to 0.941 g / cm ³ .