JPH02221489A - Flushable paper - Google Patents

Abstract

PURPOSE:To obtain the subject paper, having a high dry paper strength in a dry state with hardly any occurrence of paper dust and disintegrable with a large amount of water after use by using woody pulp and rayon as principal substances and specific paper strength enhancer therewith. CONSTITUTION:The objective flushable paper obtained by using woody pulp and rayon as principal substances and adding 0.1-5.0wt.% polyvinyl alcohol-based binder having 93-98.5% saponification degree as a paper strength enhancer thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention has moderate dry strength during storage and use, and does not significantly reduce paper strength by absorbing water or pouring into a large amount of water after use. Another object of the present invention is to provide a flushable paper and a flushable dry tissue that are easily decomposed.

B. Conventional technology Tissue paper, toilet paper chili paper 1. Thin paper such as Kyoka is made from wood pulp or wood pulp and waste paper pulp using a circular mesh or short mesh, and then dried using a Yankee dryer.
Depending on the purpose, it is manufactured by dry creping or embossing. Do not use toilet paper or tissue paper! Although it can be washed away with a large amount of water by using a +-wash, it is not suitable for tissue paper because its dry paper strength is relatively weak, it generates paper dust, and its wet paper strength is low. For this reason, wet paper strength agents such as epichlorohydrin, polyacrylamide, and polyethyleneimine are generally used in tissue paper.

C8 Problems to be Solved by the Invention Tissue paper has become an indispensable household paper in modern life, but it would be even more convenient if it could be thrown away in the toilet or kitchen after use. Particularly when disposing of the waste of infants, bedridden elderly people, or the excrement of dogs, cats, and birds, if the wiped waste and tissue paper can be flushed down the toilet, the person can be freed from bad odors and feel unsanitary, and enjoy a comfortable life.

The purpose of this invention is to provide a flushable dry tissue which has the functions of conventional tissue paper for wiping, wrapping, squeezing, and writing in addition to the flushable function of decomposing with a large amount of water.

Means for Solving Problem D1 The present invention uses a relatively small amount of a binder that acts as a paper strength enhancer when dry and significantly reduces its strengthening effect when wet, thereby improving the strength of wet paper strength such as epichlorohydrin. It is possible to provide a flushable dry tissue that is significantly different from the conventional dry tissue used.

The paper strength enhancer to be used is preferably a dry paper strength enhancer such as starch, CMC, or polyvinyl alcohol, but among them, a polyvinyl alcohol binder is preferred, and the amount added is 0.1
It is a relatively small amount of ~5% by weight. If the amount added is less than 0.1%, the paper strength enhancement effect is small, and if it is 5% or more, the paper strength enhancement effect is large, but the texture of the dry tissue becomes hard, which is undesirable. Alcohol-based fibrous binder is 5 to 1
It is reported that tear strength increases when 5% by weight is used. In addition, the mechanism of action of the paper strength enhancer is that the strength-enhancing binder covers the hydrogen bond zone of cellulose to form an alternating bond network of binder resin molecules, and that it forms a bond between the binder resin and pulp fibers, thereby reducing the bonding caused by water. It is said that this prevents the dissolution of the paper, thereby increasing the strength of the paper. Therefore, hydrophobic resins such as urea-formaldehyde resin, melamine-formalin resin, and polyamide polyamine resin are not suitable for paper strength-enhancing binders that have a remarkable paper strength-enhancing effect when dry, but are diminished when wet; Highly hydrophilic binders such as CMC and polyvinyl alcohol are suitable. For polyvinyl alcohol binders, the saponification degree is important in relation to hydrophilicity, and the saponification degree is preferably in the range of 93 to 98.5%. If it is lower than 93%, it will stick to the dryer during paper making, resulting in poor productivity, and the resulting paper will have extremely poor morphological stability in a standing environment, making it inconvenient to use. When the degree of saponification exceeds 98.5%, the paper strength enhancing effect is sufficient, but the paper strength decreases little when wet, making it difficult to exhibit flushable properties.

E1 Functions and Effects of the Invention According to the present invention, in a dry state, the dry paper strength is strong and there is little generation of paper dust, making it very convenient to store and use, and on the other hand, it can be disposed of in the flush toilet or kitchen after use, so there is no bad odor. It is possible to provide and sustain a clean and comfortable living environment without being bothered by environmental problems.

Also, like sowing paper, when sowing seeds, it covers the flat surface in the form of paper.
During germination, the water sprinkled on the paper can eliminate the paper's strength so that the paper does not press down on the new sprouts.
By adjusting the degree of saponification of polyvinyl alcohol depending on germination characteristics, it is possible to provide a seeding paper most suitable for the seed.

Also, make small bags from such paper and put fertilizer, fishing bait, etc.
Filled with feeding, cement, cement reinforcement, etc., fertilizer bags,
If you use fishing bait bags, feeding bags, cement bags, cement reinforcement bags, etc., you can work without getting your hands dirty, improving work efficiency and health, and allowing for more enjoyable leisure activities. You can also do it.

More detailed description of the F0 invention The following will be explained using examples.

Example-1 Tissue paper is produced under the following main conditions.

Pulp softness 580-620cc H paper machine
Cylindrical waste paper recovery rate 0%: Dryer
Yankee paper density: 0.3%: Winding speed: 530 i/s+in Paper was made by changing the type and concentration of the paper strength enhancer, and the properties were compared. The results are shown in Table-1.

As the sponge, sponge 557H manufactured by Dick Vercules was used. The polyvinyl alcohol binder was NL-2003 manufactured by Nichibi Co., Ltd. The zero paper strength was measured using an Instron, sample width 15xx, sample gripping length 10.
0. wx, tensile speed 50zi/min, chart speed 200
It was performed at za+/min.

Flushability was measured as follows. 5
Collect 300cc of water in a 00cc beaker and add 15zx
Two test pieces cut into a size of x50 zm were put into the test piece, and the paper was rotated at a low speed of 80 rρ using a stirrer equipped with a stirrer to examine the disintegration property (flushable property) of the paper. Flushability was determined visually, and those that disintegrated within 1 minute after stirring were judged to have flashability, and those that did not disintegrate even after 2 minutes or more were judged to have no flashability.

The generation of paper dust was visually determined by rubbing the paper. Paper strength of ^-1 and ^-2 using Kymen was strong and the wet paper was solid, and paper strength measurement was possible, but no flushability was observed. In the paper containing 0% Caymen, the paper strength decreased and although it was flushable, paper dust was observed. It was more flexible than commercially available toilet paper, perhaps because the pulp fibers were thinner than in the comparative toilet paper. On the other hand, those using polyvinyl alcohol (PVA) as a binder had high drying strength, but wet strength was so low that it could not be measured, and all had flashability. However, PV
As the addition rate of A increases, the paper tends to become harder;
The paper with addition (^-4) was judged to be too hard and unsuitable for use as tissue paper. Added 0.05% (^-7)
The drying strength was also low, paper dust generation was observed, and the paper strength enhancement effect was small. The toilet paper in the comparative example was made by Kasen Paper Co., Ltd. and was purchased from a supermarket.It was expected that a large amount of waste paper pulp was used, and some colored matter was observed even after deinking.

Example 2 TAPPI test paper was made by changing the degree of saponification of polyvinyl alcohol (PVA) fibers, and flushability was investigated. The papermaking conditions were as follows.

The results are shown in Table-2.

Pulp used LBKP 50%: Target basis weight
60g7m”NBKP 50%; Paper making TA
PPI paper OP resolution 580cc:
Drying 110℃ roller dryer Pv^ addition rate
3% Table 2 Shape stability is 1 in a desiccator at 20°C and 100% humidity.
The samples were left for day and night and judged based on their deformation and sliminess.

When the degree of saponification exceeds 98.8%, flushability deteriorates, and when the degree of saponification is 88%, it seems to be too sensitive to water.

Example 3 Using a fibrous binder (fineness 2 denier, fiber length 3zz) made of polyvinyl alcohol (PVA) with a degree of polymerization of 1200 and a degree of saponification of 95%, the following pulp paper (C '=1>, rayon paper (C-2) was obtained.

The flushability of these papers was measured. (Table-3)
For comparison, Mishima Paper's Disorbo (30g/z2) was used. There are clearly differences in flushability, and each type is expected to have different uses.

Table-3

Claims (4)

[Claims] (1) Flushable paper whose main materials are wood pulp and rayon and whose paper strength agent is a polyvinyl alcohol binder. (2) Flushable dry tissue whose main materials are wood pulp and rayon and whose paper strength agent is a polyvinyl alcohol binder. (3) Added amount of polyvinyl alcohol binder is 0
．． The flushable paper and flushable dry tissue according to (1) and (2) above, wherein the content is 1 to 5.0% by weight. (4) Saponification degree of polyvinyl alcohol binder is 9
The flushable paper and flushable dry tissue according to (1) and (2) above, which have a content of 3 to 98.5%.