FI64219C - FOERFARANDE FOER ATT FRAMSTAELLA BYGGNADSSKIVOR - Google Patents

Description

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21 KHUBPEUlX PREPARING YOUR RAKEILFUS PLATES

The invention relates to a method for producing building boards from waste materials.

Wastewater treatment has become mandatory in the treatment of process water in the paper, board and pulp industries. Centrifuges and filter belt machines are used to separate the solids. The dried pulp contains $ 20 to $ 30 in dry matter, and this in turn contains $ 20 to $ 30 in dry matter, e.g. talc, kaolin, etc. industrial additives. The waste mass itself usually contains bark, sticks, wood chips - in pieces of different sizes, hot milling. groundwood and cellulose. Each paper-10 and wood pulp company produces pulp specific to its own production. Currently, most of the waste3 is taken to landfills. This is due to the high moisture and ash content of the pulp as well as the expensive treatment equipment compared to the benefit obtained. After drying, the masses shrink considerably, up to half the previous wet-15 content.

The object of the invention is to put the above-described waste mass into useful use, and in that sense the invention is characterized by what is stated in the appended claim.

In all production, the aim is to keep the quality of the product to be manufactured. This requires extensive research before production begins to determine which wood industry production facilities are willing to sell and dispose of their waste pulp as a raw material for the building board described here. Another factor to consider is the dimensional accuracy of the plate to be produced. * As a porous plate, it shrinks as it dries.

Cement has been taken to hold the board together both wet and dry. Properly dosed, the cement keeps the mass in a volume of 20 f less than its wet volume. Cement is used for 150 “300 kg / wet mass. The building board is suitable for use in ar aukoin iins a.

30 best when its dry thickness3 is either 25 mm or 50 min. The waste pulp is a by-product of a highly refined process and already contains enough wort at the generation stage. The only substance to be added is cement. The cement powder adheres well to the damp, m an son surface? ’, It is best to apply the cement immediately after the filter belt machine.

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However, one pulp producer produces pulp for the needs of large-scale industry, so the plant in a hollow locality, in the dirt, retains its moisture for a long time. At the same time, the board becomes more uniform if it contains waste pulp from several industrial plants.

5 The first step in the preparation is to mix the different pulp components. The purpose of the mixing is to separate the different parts of the mass so that the cement adheres to the smallest possible mass particles. After mixing, a nozzle step follows, in which the mass is applied to the conveying cloth as a flat mat.

10 The next step is unpaid cutting into sheets of suitable length. The slabs are transferred to a press where the pulp particles adhere to each other. The purpose of the work is not to squeeze water from the pulp, but to make the top and bottom of the plate smooth. After coming from the press, the plate is not ready, but requires airy storage to gradually dry. The use of heat promotes drying, but it also increases manufacturing costs. The plate must be lightly pressed to maintain its shape.

Prior to marketing, dried boards can be painted with senenttivell or Spirex-type paint. The board then receives a nice hyi-V water surface, which expands the area of use of the building board. As a post-treatment, the boards can be cut to the widest possible range of dimensions.

Claims (2)

6421 9 3 22 CLAIMS A process for the production of building boards from waste materials using cement as a binder, post-treated e.g. with maar-lama.