SU878851A1 - Fibrous mass for packaging material - Google Patents

Description

should be placed on the final tampvture of 90 min. Sva; rnNnuyu mass is washed, grind to 60 ° SR on centrifugal (grinding apparatus.

Paper pulp is prepared as follows.

The fibrous material (sulphate unbleached pulp and semi-finished product) is ground separately in the usual way to 28–30 ° | SHR at a concentration of 2.5–3.5%, rosin glue is added in an amount of 5 kg / ton absolutely dry fiber. Before being fed into the press box of the paper machine B, the alumina was introduced into the mass to a pH of 4.5 and water was added to dilute the mass to a concentration of 0.15-iO, 2%. Next, carry out the outflow of bag paper by a known method.

Examples of paper preparation in laboratory conditions.

nipiHMep 1. Half briquette, obtained by sulphate 1var, which was extracted in the shale of mechanical vibrations of larch wood with f / cancer composition of 15-20 iMiM and with residual content of extractant substances 0.06-3i% TsRA to 30 ° ShR. Unbleached sulphate pulp is ground at TsRA to i30 ° SH. Pulp Composition

Physical and mechanical performance

For low tide paper weighing 80 g / m, the next. % i:

Sulfate non-white cellulose75 Semifinished25

Example 2. Preparation of the mass and pouring of paper as in Example 1. The composition of the paper pulp is as follows, weight. %: Sulfate non-white pulp70

Prefabricated30

Example 3. Preparation of the mass and pouring of paper as in Example 1. The paper composition is as follows, weight. %: Sulfate is not white

pulp60

Prefabricated40

Example 4. .Preparation of mass as, in example 1. Romming paper. Next, weight. %:

Sulfate non-white pulp50

Cake 50

The table shows the relative performance of the bag paper containing the semi-finished product from the extracted organic larch wood and the packaging of the prototype.

As can be seen from the above data, the physicomechanical indicators of the indicated masses are noticeably different.

These differences are due to a significant difference in the "similar fractional composition of larch wood (2-10 mm for cardboard and mm for plain paper), as well as a significant difference in the content of the fractional composition in the composition of the mass (for cardboard and for sack paper).

With a decrease in the residual content of extractive substances in wood, the consumption of chemicals for cooking decreases, which reduces the cost of the target product and improves its quality.

At the same time, the residual content of extractive substances does not affect the fractional composition of wood.

Claims (2)

Invention Formula The fibrous mass for the packaging material, including unbleached sulphate pulp and a semi-finished product obtained by sulphate cooking, is extraextracted in the field of mechanical oscillations of larch wood, in order to improve the quality of the packaging material. reducing its cost, the semi-finished product is used from larch wood with a fractional composition of 15-20 mm with a residual content of extractives of 0.06-3% in the following ratio of components, May. %: Nebelien sulfate 50-75 cellulose 5 Semifinished product from larch wood 25-50. Sources of information taken into account during the examination: b No. 878851 6 1. USSR author's certificate 618656, D 21 N ЗШ, Ш67. 2. USSR author's certificate 628204, D 21 N Zrya, 1977 (prototype).