SU417566A1 - - Google Patents

Description

one

The invention relates to the pulp and paper industry and relates to the human paper for the manufacture of sanitary-sanitary and household paper.

Known types of Japanese are from cellulose pulp containing fibers of bastish annual plants, such as spraying, kendryr, kuwa, kodzu, mitsumata, etc., and a mixture of dextrin and cellulose mucus as a defloculator. However, obtaining the above types of raw materials and their processing with the release of long fibers require significant costs for chemicals, high costs of manual labor and the creation of special types of equipment for the decortication of raw materials, preliminary processing, cooking and bleaching. In addition, the growth of this raw material on the outskirts of the USSR is associated with the need for its inefficient transportation to the paper industry. For these reasons, these types of raw materials cannot be considered as a source of raw materials for the manufacture of base paper for consumer goods. Also, the introduction of such deflocculating materials as dextrin and cellulose mucus into the paper pulp before the casting of paper is not sufficiently effective and does not provide even fiber ipacterium in the paper sheet.

Production of long fiber paper

based on the use of handicraft methods of processing raw materials. Paper is poured by hand scooping or on low-capacity, outdated round-grid papermaking machines.

In order to forgive the technology, improve the quality and reduce the cost of sanitary and household paper,

It is proposed to use a mixture of cotton and linen cellulose with a fiber length of 6–8 mm as a fibrous semi-finished product, and a mixture of oxidized starch, methylcellulose and sodium

carboxymethylcellulose salts in the following ratio of components, weight%: Cotton cellulose53-67

Flax on (Cellulose22-27

Deflocul tor11-20

This composition of paper pulp, as well as the content in the proposed paper of a new deflocculator, determine the soft, absorbent good quality paper that satisfies the hygienic

required and 1M.

It is proposed to use cotton processing waste - type P1 and IV type lint as raw material for the production of cotton cellulose, and flax processing waste as raw material for the production of flax pulp:

short flax fiber no. 2, combing hair, flax dressing from carding machines and other types of waste from the processing of flax materials. Paper pulp was prepared as follows.

The original plant material is varied in the sulphate layer under mild conditions. The cooking of flax and chlora pulp is carried out separately. This is due to the fact that the duration of the process of cooking flax waste is somewhat longer than the process of cooking waste cotton fiber processing.

The bleaching of cellulose is carried out in a multi-stage process using active chlorine, brine solution, pine, and chlorine dioxide.

The grinding of cotton and flax pulp is carried out jointly with an IB roll or other grinding apparatus at the most insignificant use of the mill to avoid the shortening of the fibers. The degree of grinding of the mass should lie IB within 30 ° SR, depending on the technical indicators of the manufactured range of long grain paper. To obtain a uniform suspension of the fiber before grinding the pulp, a deflocculator is fed into the roll in an amount of 50% of its total consumption. The rest of the defloculator is introduced into the grind before casting the paper web. The used defloculant consists of a mixture of starch, oxidized with barium peroxide or other oxidizing agents, methylcellulose, sodium carboxymethylcellulose, taken in a ratio of (11-20) 1: 1.

To impart the desired whiteness and color to the paper, optically bleaching agents and colorants can be introduced into the pulp. Next, the pulp is subjected to ebb, pressing and drying.

The resulting paper has increased

absorbency and hygroscopicity with respect to water and WATER solution hmm, it is necessary, my moisture resistance, increased mechanical pr0: 41nosti and extensibility in comparison with the papers according to GOST 10838-64.

The main physicomechanical characteristics of paper weighing 60 ± 5 g / m are as follows: gaps | B-1 - th load in the longitudinal direction 3.0 kgf, and, in popepom - 1.4 kgf; Elongation in the longitudinal direction of 2.5%, a, in the transverse-3, 0%; Becku softness 25.0 s; capillary absorbency is 40.0 mm and air permeability is 200 ml / min.

Due to the use of flax and cotton processing waste as a raw material, which are the cheapest and least suitable for the purpose of making textiles, the cost of paper is low, which makes it acceptable for preparing household and sanitary paper products. without washing (linen, the simplest types of clothing).

Iredmet invention

Paper pulp for the manufacture of sanitary-hygienic and household paper from a fibrous cellulose-containing semi-finished product and a deflocculator, characterized in that, in order to improve the consumer properties of paper, it contains a mixture of cotton and linen cellulose with a fiber length of 6-8 mm, and as a deflacator, a mixture of oxidized starch, methylcellulose, and sodium carboxymethylcellulose in the following ratio of components (c. wt.%):

Cotton cellulose53-67

Flax for cellulose22-27

Deflocul tor11-20