JPS58160382A - Adhesive paper tape - Google Patents

Abstract

PURPOSE:To provide an adhesive tape which has sufficient tensile strength in a lengthwise direction, does not warp even when rewinded in a desired length and pulled and is especially useful as lining tape for coating operation, prepared by using a two-layer paper as base sheet. CONSTITUTION:The paper used as base sheet consists of two layers formed by impregnating, with synthetic rubber, paper (A) which has a higher tensile strength in a lengthwise direction than in a crosswise direction and paper (B) in which tensile strength is the same as or higher in a crosswise direction than in a lengthwise direction. The adhesive tape is prepared by sealing up one side of the paper by coating or impregnation with a resin such as shellac and applying a pressure-sensitive adhesive to the other side. The paper is made from a mixture of beaten wood pulp and short plastic fiber such as ''Vinylon '' fiber in a blend ratio of about 95-30:5-70 by weight. A and B should pref. be in a ratio of 8:2-2:8 by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper adhesive tape using a paper material as a support, and particularly provides a paper adhesive tape useful as a line drawing tape for painting work.

The support for paper adhesive tapes for masking used during painting is generally made from a mixture of beaten wood pulp and short fibers made from plasti such as vinylon, nylon, rayon, polyolefin, and polyester. Longitudinal tensile strength to obtain mechanical strength〉
Paper that satisfies the relationship of tensile strength in the width direction is impregnated and fixed with synthetic rubber, and one surface of the processed paper is coated with shellac, polyvinyl alcohol, polyvinyl acetate, and polyacrylic resin. Paper adhesive tape is made by impregnating and applying a resin such as 0 to seal the seal, and then providing a pressure-sensitive adhesive layer on the other surface. When masking parts, there is no problem if the distance to be masked is relatively short, but various problems occur when used for line drawing or color separation on the bodies of large vehicles such as trains and passes. It is. That is, when applying tape in a straight line to a large item like the one mentioned above, one end is applied to a predetermined location on the item surface in advance, and then the tape is stretched to the required length. The tape is rewound a little, then strongly pulled on the other end to make a straight line, and then attached to the item in that state.However, due to the tension at this time and the directionality of the paper, the tape may curve inward or outward in the width direction ( There are drawbacks such as curl) and difficulty in achieving the desired straight line.

The present invention provides a novel paper adhesive tape that solves various disadvantages when used for such large-sized articles, and the gist thereof is to provide a paper adhesive tape using paper material as a support, which has the above-mentioned problems. The paper material is composed of two layers, and one layer satisfies the relationship of length direction tensile strength > width direction tensile strength, and the other layer satisfies the relationship of length direction tensile strength ≦ width direction tensile strength. That's true.

The paper adhesive tape of the present invention has a feature that it has sufficient tensile strength in the longitudinal direction and does not curve even if it is unwound to a required length and stretched by -2.

The paper materials used in carrying out the present invention are generally beaten wood valves, vinylon, nylon, rayon, etc.
The paper material is made by mixing short fibers made of plastic such as polyolefin and polyester in a ratio of approximately 95 to 30:5 to 70 (weight ratio), but the paper material has substantially no interface. It consists of two integrated layers, and one layer satisfies the relationship of longitudinal tensile strength > width direction tensile strength, and the other layer satisfies the relationship of length direction tensile strength ≦ width direction tensile strength. It is reassuring to know that it has been combined with the following.

Such a paper material has a layer made so as to satisfy the relationship of longitudinal tensile strength>width direction tensile strength, and a layer made so as to satisfy the relationship of longitudinal direction tensile strength≦width direction tensile strength. It is obtained by overlapping the layers on a papermaking blanket and then going through a conventional process such as pressing.

However, the difference in tensile strength of the layers that satisfies the relationship of tensile strength in the width direction (length direction tensile strength) is set to be 1 in the length direction, then A times or less in the width direction, preferably in the range of 2 to Δ times. but,
It is preferable for imparting mechanical strength in the length direction, and in the relationship of length direction tensile strength ≦ width direction tensile strength,
When increasing the width in the width direction, it is preferable to make the width direction 1 and the length direction more than A times, in order to prevent bending when tension is applied to the tape. The basis weight ratio of the layer satisfying the relationship of tensile strength>width direction tensile strength and the layer satisfying the relationship of length direction tensile strength≦width direction tensile strength is 1 to 1:9;
Preferably, it is in the range of 8:2 to 2:8,
If the former is 9 or more, the effect of preventing curvature will be small, and if the latter is 1 or less, the mechanical strength of the tape will be insufficient, which is not preferred.

One side of the paper material constructed in this way is coated with shellac,
Sealing is performed by coating and impregnating resins such as polyvinyl alcohol, polyvinyl acetate, and polyacrylic resin using a conventional method, and a pressure-sensitive adhesive layer mainly made of rubber and/or synthetic resin is formed on the other side. It is then wound into a roll and made into an adhesive tape.

Since the paper adhesive tape of the present invention is constructed as described above, it has mechanical strength in the longitudinal direction and does not curve inward or outward even when tension is applied in the longitudinal direction. Has characteristics.

Examples of the present invention will be shown below.

Example: Mixing beaten wood pulp and vinylon staple fibers in a ratio of 1:1 Using raw materials 1 to 1, the ratio of longitudinal tensile strength was 4:1 and 1:1.2. A paper material made by combining layer (B) with and at the basis weight ratio shown in Table 1 (total basis weight 309.-
Apply polyvinyl acetate resin liquid to one side of Q) and dry it.
Furthermore, a copolymer solution of octadecyl acrylate and acrylic acid as a back treatment agent is applied thereon and dried.

Next, a rubber-based pressure-sensitive adhesive layer is formed on the other side of the paper material using a conventional method to obtain a paper adhesive tape of the present invention having a width of 18 mm. gender) was measured. The test results are shown in Table 1.

Tensile strength: In a pendulum type ShiM tube tester, distance between chucks 10 cm, tensile speed BOOrnm/+nt
Curvature of the strength measured at ('J: at 20°C x 65% R, H): The rewound part of the tape was glued and fixed to one end of a 10m wide vertical wall, and approximately 10m was unwound. Pull the other side of the tape firmly with -2 tension (approximately 5k&%amm)
(tension), and visually observed whether the tape curved in the width direction.

Table 1 As is clear from the above examples, the paper adhesive tape of the present invention has sufficient tensile strength and is notable for being free from curling.

The paper adhesive tape of the present invention is particularly useful as a masking tape for line drawing due to the above characteristics, but it can also be used for applications such as sealing, packaging, and bundling.

patent applicant Nitto Electric Industry Co., Ltd. Representative Kamigata Sanbe 539-

Claims (1)

[Claims] In a paper adhesive tape that uses a paper material as a support, the paper material is composed of two layers, and one layer has a relationship of longitudinal tensile strength > width direction tensile strength, and the other layer has a longitudinal tensile strength. A paper adhesive tape characterized by satisfying the relationship of strength≦width direction tensile strength.