JP2002327387A - Water disintegrating paper and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a sheet of water disintegrating paper readily satisfying water disintegrating properties and nonresidual properties for enabling the peeling while making residual fibers scarcely remain in a pressure-sensitive adhesive at a lower cost by utilizing a conventional raw material for arboreal pulp paper and fundamental equipment. SOLUTION: This method for producing the sheet of water disintegrating paper comprises blending 30-60% of a softwood pulp 1 with 40-70% of hardwood pulp 2, preparing a raw material pulp, beating the resultant raw material pulp with a refiner 4, regulating the freeness to 350-550 mlc.s.f and forming the sheet of paper with a paper machine 5 for forming the sheet of paper without sucking the regulated pulp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hydrolyzed paper and a method for producing the same. In particular, the present invention relates to a water-disintegrated paper manufactured from tree pulp and hardly remaining fibers after peeling from an adhesive, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various types of water-disintegrated paper or water-soluble paper have been used as toilet paper, cleaning paper around a toilet, and toilet seat sheet paper to be set on a toilet seat cover. These water-disintegrated or water-soluble papers are liable to fluff, and when they are peeled off after being attached to an adhesive tape or the like, a large amount of fibers remain on the tape. Therefore, contact with an adhesive substance is generally prohibited.

Recently, a one-touch toilet seat cover set of a type in which toilet seat sheet paper stacked and stored in a toilet seat lid by an adhesive button fixed on a cushion sheet is pulled out and set by raising and lowering the toilet seat lid has begun to spread. This toilet seat sheet paper is required to have non-residual properties that do not leave residual fibers on the pressure-sensitive adhesive button after peeling, in addition to degradability. Heretofore, water-soluble paper containing a large amount of water-soluble substances such as CMC (carboxymethylcellulose) has been used as a sheet paper used in such applications because it is necessary to satisfy the above-mentioned bi-hydrolysis and non-residual properties.

[0004]

The conventional water-soluble paper containing a large amount of water-soluble substances such as CMC (carboxymethylcellulose) satisfying both the water-dissolving property and the non-residual property has a considerable amount of raw materials and difficulty in production. It had to be expensive.

Accordingly, an object of the present invention is to obtain a water-disintegrated paper that satisfies water disintegration and non-residuality more easily and cheaply by utilizing the conventional raw materials and basic equipment for tree pulp paper.

[0006]

In order to achieve the above object, a method for producing a hydrolyzed paper according to the present invention comprises mixing raw material pulp by mixing 30 to 60% softwood pulp and 40 to 70% hardwood pulp. Mixing step, and beating the raw pulp with a refiner to obtain a freeness of 350 to 550 ml.
s. f. And paper making the adjusted pulp without suction, thereby making it possible to use the conventional raw materials and basic equipment for wood pulp paper to reduce the cost and ease of water separation. Hydrolysis paper that satisfies the properties and non-residual properties can be manufactured.

[0007] Further, a compounding step of preparing a raw pulp by mixing 60% softwood pulp and 40% hardwood pulp, and beating the raw pulp with a refiner to obtain a freeness of 38%
0 to 390 ml c. s. f. If the conditions are specified to have a step of adjusting the paper pulp and a step of making the adjusted pulp without suction, a production method capable of obtaining an optimum hydrolytic paper can be achieved.

(Action) The hydrolyzed paper obtained by the above-mentioned production method is easily dissolved in water and can be peeled off with almost no residual fiber remaining in the adhesive, so that the same adhesive can be used repeatedly.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the accompanying drawings, using examples and comparative examples. FIG.
It is a process explanatory view showing a schematic process of a manufacturing method of water disintegration paper in the present invention.

Referring to FIG. 1, a first embodiment of a method for producing hydrolyzed paper according to the present invention will be described. A softwood having a long fiber such as pine, fir, and tsuga is treated in a usual pulp manufacturing process (not shown) to obtain softwood pulp 1. Similarly, broadleaf trees with short fibers such as poplar, eucalyptus, and birch are treated in a usual pulp manufacturing process (not shown) to obtain hardwood pulp 2. The softwood pulp 1 thus obtained is 60%, and the hardwood pulp 2 is 40%.
% In the blending step 3 to obtain a raw pulp which is a blended pulp. Next, the raw material pulp is beaten by the refiner 4 so as to make the length of the stock fiber uniform, and the stock fiber is fluffed to improve the fiber entanglement. By adjusting the beating degree, the freeness is 380 to 390 ml. s. f. (Canada standard freeness) Adjust to raw pulp. Next, the prepared raw pulp is passed through a round-mesh downstream bat paper machine 5 (using a Fuji-type box making machine) for making paper without suction, as in the case of making Japanese paper, to remove fine fibers as much as possible. Make a paper so that it does not. Thereafter, the paper is put in a dryer 6 using a Yankee made of casting, dried, and further passed through a calender 7 to obtain smoothness, and the paper thickness is adjusted.

[0011] The water disintegrated paper manufactured as described above is a toilet seat cover set described in the above section of "Prior Art", that is, a toilet seat sheet stacked and stored in a toilet seat lid by an adhesive button fixed on a cushion sheet. The paper was set in a one-touch toilet seat cover set in which the paper was pulled out by raising and lowering the toilet seat cover, and an adhesion test (non-residual test) was performed. As a result, with the newly attached adhesive button, a drawer set of 115 sheet papers was possible. For the adhesive button, a different adhesive TG sheet (product number 100F80T-05F) was used from the Mochida Shoko Co., Ltd. TG sheet (adhesive sheet made of a special adhesive elastomer that can be used repeatedly) with the back surface strongly adhered to the button. . The water dispersion time (easiness of loosening) of the water disintegrated paper was 76 seconds on average.

In the above embodiment, the softwood pulp 1
% And hardwood pulp 2 were mixed at a ratio of 40%. However, since the stiffness of the paper was required, the ratio of the softwood pulp for strengthening the stiffness of the paper was increased to the limit. Conventionally, softwood pulp and hardwood pulp are usually beaten separately, but in the present invention, both types of pulp are beaten together. By beating together, only the hardwood pulp is beaten, and the softwood pulp is hardly beaten. As a result, it is considered that softwood pulp was joined to hardwood pulp to improve the water decomposability and that the fiber was not removed by the adhesive. In order to improve water dissolving property and non-residual property, it is considered that the hardwood pulp is desirably 40% or more.

(Other Embodiments) Other embodiments of the hydrolyzed paper according to the present invention manufactured under different manufacturing process conditions will be described.

In the hydrolytic paper manufactured by changing only the mixing ratio of both types of pulp, even if the softwood pulp is 30% to 60%, in the above adhesion test (non-residuality test), a drawer set of 120 or more sheet papers is set. Was possible. This is because, by beating together, hardwood pulp with a short fiber is mainly beaten, and softwood pulp with a long fiber becomes like a hardwood pulp and easy to hydrolyze,
This is considered to be due to the fact that the fiber becomes paper that cannot be taken up on the adhesive surface.

Further, only the freeness is set to 350 to 550 ml.
c. s. f. In the above-mentioned adhesion test (non-residuality test), it was possible to set a drawer of 115 or more sheet papers. By the way, this freeness is 500ml with ordinary copy paper.
c. s. f. , 580 for normal toilet paper
mlc. s. f. It is about. In addition, conventional water disintegration paper has a freeness of 550 mlc. s. f. There is a need.
However, in embodiments according to the invention, the freeness is between 350 and 550 mlc. s. f. The water dispersing time can be sufficiently shortened even in the range described above, and the use as a water-disintegrated paper is endured.

(Comparative Example) When a vacuum former type paper machine is used in place of the above-mentioned round mesh forward-flow bat paper machine,
Even in the case of 60% softwood pulp, the above-mentioned adhesion test (non-residuality test) allowed only a drawer set of 20 or less sheet paper.

[0017]

As described above, according to the present invention,
Utilizing the conventional raw materials and basic equipment for wood pulp paper, it is possible to manufacture a water-disintegrated paper that satisfies the water-disintegration property and the non-residual property that can be peeled off with little residual fiber remaining in the pressure-sensitive adhesive, easily and cheaply.

[Brief description of the drawings]

FIG. 1 is a process explanatory view showing a schematic process of a method for producing hydrolyzed paper according to the present invention.

[Explanation of symbols]

1 softwood pulp, 2 hardwood pulp, 3 compounding process,
4 Refiner, 5 paper machine, 6 dryer, 7 calender.

Claims (4)

[Claims] 1. A compounding step of mixing 30 to 60% of softwood pulp and 40 to 70% of hardwood pulp to prepare a raw pulp, and beating the raw pulp with a refiner to obtain a freeness of 350 to 550 ml. s. f. And a step of paper-making the adjusted pulp without suction. 2. A compounding step of mixing a 60% softwood pulp and a 40% hardwood pulp to prepare a raw pulp, and beating the raw pulp with a refiner to obtain a freeness of 380 to 390 ml. s. f. And a step of paper-making the adjusted pulp without suction. 3. A raw pulp prepared by mixing 30 to 60% of softwood pulp and 40 to 70% of hardwood pulp is beaten with a refiner to obtain a freeness of 350 to 550 m.
lc. s. f. A water disintegrated paper characterized in that the pulp prepared in accordance with (1) is made without suction. 4. A raw pulp prepared by mixing 60% of softwood pulp and 40% of hardwood pulp is beaten with a refiner to obtain a freeness of 380 to 390 ml. s. f. A water disintegrated paper characterized in that the pulp adjusted to the above is made without suction.