JP2010203006A - Impregnation-coating type japanese paper tape substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impregnation type Japanese paper tape substrate or impregnation-coating type Japanese paper tape substrate, suppressing the tape breakage by a hand on a masking work time, without decreasing working efficiency while suppressing the using amount of a synthetic fiber. <P>SOLUTION: The impregnation-coating type Japanese paper tape substrate capable of suppressing the tape breakage by the hand on the masking work time without increasing the using amount of the synthetic fiber is provided by mix-paper making the synthetic fibers such as a vinylon, a polyester, a nylon, a polyolefin, an acrylic, etc., having 1 to 5 dtex fineness (thickness) with the Japanese paper. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a Japanese paper tape substrate which is a support for an adhesive tape suitable for masking applications,
The present invention relates to an impregnated type Japanese paper tape base material or an impregnated coating type Japanese paper tape base material that increases tear strength and improves workability.

Paper adhesive tape is widely used for masking when painting in vehicles, buildings, etc. The paper adhesive tape is required to have sufficient strength so that it does not easily break when being peeled off. As a support for this paper adhesive tape, synthetic resin is applied as an undercoat layer of an adhesive layer on one side of a base paper mixed with synthetic fiber in wood pulp, and a release agent sealing layer and a paint stain are applied on the opposite side. Constructed with synthetic resin applied as an entrainment prevention layer (hereinafter coated type Japanese paper tape base)
It has been known. Also, a base paper made by mixing synthetic fiber with wood pulp is impregnated and dried with a synthetic resin, and one side of the impregnated paper is coated with a synthetic resin as a release agent sealing layer and a paint penetration layer (hereinafter referred to as impregnation). A coating type Japanese paper tape base material) is known.

The coating type Japanese paper tape base material does not have enough synthetic resin in the thickness direction of the base paper, so there is a limitation on the adhesive due to the problem of back-through of the liquid in the adhesive application process, and flexible as a masking tape Inferior to impregnated coated type Japanese paper tape substrate, there is a problem that it is difficult to stick on a curved adherend. Impregnated coating type Washi tape base material has few restrictions on adhesive, has excellent removability, which is important for masking tape, and can use water-based acrylic pressure sensitive adhesive considering the environment. As the support, the impregnation coating type Japanese paper tape base material has been transferred.

If the strength of the impregnated coating type Japanese paper tape base material, particularly the tear strength, is low, the tape will break during the peeling and cause a reduction in work efficiency.

As a countermeasure, a Japanese paper tape base material is mixed with synthetic fibers having a fiber length of about 5 mm such as vinylon and PET to increase the strength. However, these synthetic fibers are more expensive than natural fibers.
When the thickness of the synthetic fiber is not selected, in order to increase the strength of the base material, there is no choice but to use a fiber having a longer fiber length or increase the amount of the synthetic fiber. However, fiber length is limited due to manufacturing constraints. In addition, the amount of synthetic fiber is limited from the viewpoint of cost.

Patent Document 1 proposes to use a film substrate having a high tear strength for the masking tape in order to prevent the tape from being cut at the time of peeling.
Patent Document 2 proposes to make a Japanese paper-like fiber product excellent in tear strength by bonding a base fabric made of thermoplastic polymer fibers having a fineness of 5 to 60 dtex and a nonwoven fabric. Among them, it is pointed out that a fineness of 5 dtex or more is necessary to obtain high tear strength. Further, Patent Document 3 also points out that a fineness of a certain level or more is necessary for maintaining strength.
However, in the impregnated type Japanese paper tape base material and the impregnated coated type Japanese paper tape base material, there was no example which examined the thickness of the synthetic fiber to be mixed.

JP 2007-31552 A JP 2006-289723 A Japanese Patent Laid-Open No. 6-200462

The present invention improves the tear strength of the masking tape while reducing the amount of synthetic fiber used,
It is an object of the present invention to provide an impregnated type Japanese paper tape base material or an impregnated coating type Japanese paper tape base material that does not reduce the work efficiency.

As a result of intensive studies to solve such problems, the present inventors have found that the fineness (thickness) is 1 to 5 dtex.
It was found that the synthetic fiber was mixed with Japanese paper to solve the problem, and the present invention was completed.
That is, the present invention
(1) An impregnation type Japanese paper tape base material obtained by impregnating a base paper obtained by mixing wood pulp and synthetic fiber with an impregnation resin, wherein the fineness of the synthetic fiber is 1 to 5 dtex Type of washi tape base material,
(2) The impregnated type Japanese paper tape base material of (1), wherein the synthetic fiber mixing ratio is 3 to 50% by weight;
(3) The impregnation type Japanese paper tape base material of (1) or (2), wherein the impregnation resin is a resin having a glass transition temperature of −25 ° C. or less, and the impregnation rate of the resin into the base paper is 20% or more,
(4) An impregnated coating type Japanese paper tape base material in which a resin layer is provided by coating after impregnation on the tape base material of (1), (2) or (3),
I will provide a.

According to the present invention, it is possible to obtain an impregnated type Japanese paper tape base material or an impregnated coated type Japanese paper tape base material that improves the tearing strength of the masking tape and improves the working efficiency while suppressing the amount of synthetic fiber used.

Examples of the base paper used in the present invention include Japanese paper mixed with wood pulp, synthetic fiber and the like. Paper making is generally performed by a circular paper machine, but a long paper machine, an inclined wire paper machine, a short net type, a combination type of a circular net and a short net, or the like may be used.

As the synthetic fiber, vinylon, polyester, nylon, polyolefin, and acrylic can be used. Among them, vinylon and polyester are particularly preferable from the viewpoint of disintegrating property of the synthetic fiber. In terms of tear strength, the main fiber that is not fused is more preferable than the heat-fusing type (binder) fiber.

As wood pulp, N material is desirable in terms of strength. Synthetic fiber blending ratio with wood pulp is 3
-50% by weight is preferred. When the synthetic fiber mixture ratio is 2% or less, the strength of the base material cannot be sufficiently obtained. If it is 50% or more, not only will the cost be remarkably increased, but hand cutting will be poor.

The fiber length of the synthetic fiber is preferably 3 to 6 mm. If it is less than 3 mm, sufficient strength of the substrate cannot be obtained. If it exceeds 6 mm, binding tends to occur and it becomes difficult to make Japanese paper.

The thickness of the synthetic fiber is 1 to 5 dtex. More preferably, it is 2-4 dtex. If the thickness is other than this, the tear strength of the substrate cannot be sufficiently obtained. Furthermore, if the fiber is thicker than 5 dtex, the appearance becomes worse due to increased surface irregularities and increased fuzz. Moreover, if the fiber is thick, the flexibility of the base material is lost and the working efficiency is lowered.

The basis weight of the base paper is preferably 25 to 40 g / m ^{2. If} the basis weight is less than 25 g, sufficient strength cannot be obtained when the support is used, and the tape is easily cut. On the other hand, when the basis weight is 40 g or more, the waist becomes strong and the adherence of the adherend becomes poor. In order to impart strength, a wet paper strength agent, a paper strength enhancer, and a paper strength aid can be added by internal or external addition.

The glass transition temperature of the resin described in the present invention is calculated from the resin monomer composition ratio and the glass transition temperature of each monomer.

The impregnated paper used in the present invention is obtained by impregnating the above base paper with an emulsion resin and drying it. Examples of the resin to be used include acrylate ester-based, styrene-butadiene rubber-based, and methyl methacrylate-butadiene rubber-based emulsions, which can be used alone or in combination. Among them, an emulsion resin having a glass transition temperature of −25 ° C. or lower in order to give the strength and flexibility of the impregnated paper. When the glass transition temperature is -25 ° C. or higher, the strength of the base material cannot be obtained sufficiently, resulting in tape breakage.

The impregnation amount of the resin is preferably 20% by weight or more with respect to the base paper. If the resin amount is less than 20% by weight, the strength as a support is insufficient, such as a back-through of the liquid in the adhesive coating step. There are concerns. The impregnation method may be either a method of impregnating with a size press or the like in-line after the paper making, or a method of dip impregnation offline after the paper making dry winding.

The impregnated coating type tape substrate of the present invention can be provided with a resin layer for the purpose of preventing blocking or preventing penetration of a solvent. The resin provided on one side of the impregnated paper is an emulsion resin having a glass transition temperature of 0 to 40 ° C. When the glass transition temperature of the resin is 0 ° C. or lower,
There is concern about blocking when the tape base material is wound up in a roll state in that the deterioration of hand cutting property under high temperature and high humidity is not improved. If a resin having a temperature of 40 ° C. or higher is used, the resin film property is poor, and the effect of preventing the release agent and preventing the penetration of the paint cannot be sufficiently obtained.

Examples of the resin include acrylic ester-based, styrene-butadiene rubber-based, acrylonitrile-butadiene rubber-based, methyl methacrylate-butadiene rubber-based, and vinyl acetate-based emulsions, which can be used alone or in combination.

The coating amount (dry rice basis weight) of the resin is ² to ²⁰ g / m ² . When the coating amount is less than 2 g / m ² ,
The penetration of the solvent cannot be sufficiently prevented, which is not preferable. Moreover, when it becomes 20 g / m ² or more, the cost increases. The resin coating can be either on-machine coating provided in a paper machine or off-machine coating after paper making. The coating method is not particularly limited, and for example, a coater such as an air knife coater, a rod coater, and a blade coater, and other coating methods can be used.

By using the above-described impregnated type tape base material or impregnated coating type tape base material of the present invention and applying a release agent and an adhesive by a known method, a Japanese paper tape for masking can be obtained. The masking tape is a removable tape and generally has a low adhesive strength. Therefore, rewinding is relatively easy without providing a release agent on the resin layer of the present invention, and the resin layer can be used as a release layer and can be omitted.

The Japanese paper tape substrate of the present invention can be suitably used not only as a mask for masking but also as a support for a tape for light packaging.

Examples of the present invention will be given below. The handsheet was made with a cylindrical sheet machine. The tear strength measurement was performed in an atmosphere of 23 ° C.-50% according to JIS P-8116 method. The Japanese paper of the present application is generally manufactured by the above-mentioned paper machine, but the tendency to be obtained is not different from the comparison by the hand-made sheet.
Since the effect of the coating layer on the strength of the base material is small, an uncoated base material in which a base paper is impregnated with a resin is used in Examples and Comparative Examples.
In order to avoid errors for each experiment, the experimental result is Comparative Example 1 (Vinylon fiber FFN manufactured by Unitika Ltd.)
The strength ratio was 0.6 dtex, 3 mm, 10% mixed paper).

Example 1
Unitika Co., Ltd. vinylon fiber AH (1.1 dtex, 5 mm) was prepared as a synthetic fiber. This vinylon fiber is mixed with 10% by weight of wood pulp and 90% by weight of wood pulp.
² hand-made to prepare a sheet. Acrylic emulsion / SBR emulsion = 5
A 0/50 mixed solution was impregnated and impregnated and dried so as to be 25 to 30% by weight based on the dry weight of the base paper to obtain an impregnated tape substrate.

(Example 2)
In Example 1, synthetic fiber was made of Unitika Ltd. vinylon fiber 2.2 GB (2.2 dte).
An impregnated tape substrate was obtained in the same manner as in Example 1 except that x was changed to 4 mm.

(Example 3)
In Example 1, synthetic fiber was made of Unitika Ltd. vinylon fiber 2.2 GB (2.2 dte).
x, 6 mm) An impregnated tape base material was obtained in the same manner as in Example 1 except that the thickness was changed to 6 mm.

Example 4
In Example 1, the synthetic fiber is made of Unitika Ltd. vinylon fiber 22a (2.7 dtex,
An impregnated tape substrate was obtained in the same manner as in Example 1 except that the thickness was changed to 4 mm).

(Example 5)
In Example 1, the synthetic fiber is made of Unitika Ltd. vinylon fiber 22a (2.7 dtex,
An impregnated tape substrate was obtained in the same manner as in Example 1 except that the thickness was changed to 6 mm.

(Example 6)
In Example 1, the synthetic fiber was 2.7 BP (2.7 dte) manufactured by Unitika Ltd.
An impregnated tape substrate was obtained in the same manner as in Example 1 except that x was changed to 4 mm.

(Example 7)
In Example 1, the synthetic fiber was PET fiber N801 (1.6 dtex, manufactured by Unitika Ltd.).
An impregnated tape substrate was obtained in the same manner as in Example 1 except that the thickness was changed to 5 mm.

(Example 8)
In Example 1, the synthetic fibers were PET fibers N801 (3.3 dtex, manufactured by Unitika Ltd.).
An impregnated tape substrate was obtained in the same manner as in Example 1 except that the thickness was changed to 5 mm.

(Comparative Example 1)
An impregnated tape base material was obtained in the same manner as in Example 1 except that vinylon fiber FFN (0.6 dtex, 3 mm) manufactured by Unitika Ltd. was used as the synthetic fiber.

(Comparative Example 2)
Unitika Ltd. vinylon fiber 5.3BP (5.3dtex, 4mm) as synthetic fiber
An impregnated tape substrate was obtained in the same manner as in Example 1 except that was used.

(Comparative Example 3)
Unitika's vinylon fiber 6.7BP (6.7dtex, 4mm) as synthetic fiber
An impregnated tape substrate was obtained in the same manner as in Example 1 except that was used.

(Comparative Example 4)
An impregnated tape base material was obtained in the same manner as in Example 1 except that PET fiber 841 (8 dtex, 5 mm) manufactured by Unitika Ltd. was used as the synthetic fiber.

Table 1 shows the tear strength ratios of the impregnated Japanese paper tape base materials obtained in Examples and Comparative Examples.

＊引き裂き強度比：比較例１の引き裂き強度を１とした時の値。値が大きいほど切れにく
い

* Tear Strength Ratio: Value when the tear strength of Comparative Example 1 is 1. The higher the value, the harder it is to cut

Claims (4)

An impregnated type Japanese paper tape base material obtained by impregnating a base paper mixed with wood pulp and synthetic fiber with an impregnating resin, wherein the fineness of the synthetic fiber is 1 to 5 dtex. Paper tape base material. The impregnated type Japanese paper tape base material according to claim 1, wherein the blend ratio of the synthetic fiber is 3 to 50% by weight. The impregnated type Japanese paper tape base material according to claim 1 or 2, wherein the impregnating resin is a resin having a glass transition temperature of -25 ° C or lower, and the impregnation ratio of the resin to the base paper is 20% or more. An impregnated coated Japanese paper tape base material, wherein a resin layer is provided by coating after impregnation on the tape base material of claim 1, claim 2 or claim 3.