SU632788A1 - Method of preparing fibrous mass for manufacturing parchmyn - Google Patents

Description

This invention relates to continuous methods for grinding paper pulp for the manufacture of packaging, paper, in particular, podpragmenha, and is intended for use in the pulp and paper industry. A method of preparing pulp for preparing a fermentor by continuously grinding it when changing the specific load on the knife headset. tl. The disadvantage of this method is the relatively large specific power consumption for grinding in the presence of a large number of mills. The purpose of the invention is to reduce production costs by reducing specific electricity consumption and reducing the number of mills. This is achieved by the fact that, according to the proposed method, the mass is first spread at a constant specific load on the edges of the knife headset to a grinding degree of 55-70 degrees R, then the specific load is reduced to 0.5 from the initial load and 0.4 - 0.8 of the initial value, the mass is home to the degree of grinding 75 - 85 ° SR. The method is carried out by sd; Example. Sulphite conifer bleached pulp with an initial grinding grade of 14 SR and fiber length ill dg is ground in a MD-31 disc mill with a specific load on the edges of the knives 1000 W / s to the degree of grinding. Datza grinding is carried out on a conical b5e. M1SL-02 with a unit load of 1000 W-s / km. When reaching the degree of the help of 68ShR, the specific load on the mill is reduced to 500 BtS / km and with a gradual reduction of the load to 400 W “s / km, the mass is reduced to the degree of help of 78ShR and the fiber length 43 dg. The specific energy consumption for the entire grinding is 1070 kWh / ton. PR and M e p 2. Sulfite softwood bleached pulp with an initial grinding degree of 15 ° SR and a fiber length of 110 dg is ground on a KD-31 disc mill to a grinding degree of 59 ° SR with a unit load on the edges of the knives of 1000 W-s / km. Next, the grinding is carried out on a MKL-02 conic mill with a specific load of 1000 W-s / km. Upon reaching the degree

Grinding 66 SR, the specific load on the mill is reduced to 700 W "s / km and with a gradual reduction of the specific load to 450 W / s, the mass is added and the degree of grinding 82 SR and fiber length 40 dg, the specific energy consumption for the entire grinding is 5 1260 kW "h / t.

PRI m eper 3. Sulfite (8th bleached pulp with an initial degree of grinding 14 SIR and 0 lino fiber 112 dg grind

on a disk mill MD-31 with a specific load of 1000 W "s / km to the degree of grinding. Next, the grinding is carried out on two cylindrical mills of Strehker-Feiner at specific loads of 900 and 800 W-s / km and the mass is ground to the degree of grinding and the fiber of 51 dg. The specific energy consumption for the entire grinding is 790 kWh / ton.

Comparative data proposed and known methods are given in the table.

Number of steps

grinding

Claims (1)

The final degree of grinding, iiff Fiber length, dg Specific energy consumption for grinding Thus, the proposed method of preparing the pulp reduces the specific energy consumption by 20% i and reduces the number of mills in the stream by 25%. making a poperty by continuously grinding it when changing the specific load on the edge of a knife set, differs from and with the fact that, in order to reduce production costs 10-13 76-83 76 51 33-43 2200-2500 790 by reducing the specific consumption of electrical energy and reducing the number of mills, first grind the mass under constant specific load on the edges of the knife headset to the degree of grinding of 55-70 SR, then reduce the specific load to 0.5-0.9 from the original loads up to 0.40, 8 from the initial value of the mass domayvayut to the degree of grinding 75-85 SHR. Sources of information taken into account in the examination: 1. USSR Author's Certificate 5.00312, ZE 21 V 1/30, 1976.