CS257365B1 - Manteled building plate - Google Patents

Description

The invention relates to a sheathed shallow-core construction that has an untreated, bilaterally smooth or embossed surface.

Simultaneously manufactured macrofibre thatch and similar materials have an insulating function in buildings, but at the same time they narrowly specify and limit their use. Their low bulk density, strength, abrasion resistance and limited surface treatment options, as well as flammability and low organism resistance, require their combination with other material, with very low aggressiveness of surrounding and impact types of all kinds.

The drawbacks of the prior art are overcome by the sandwiched building board according to the invention, which consists of three layers of matter, the central layer having a thickness of 50 to 70 ° / oz of the total depth of thatch consisting of a poppy fiber board weighing 25 to 35 °. of the total weight of thatch and the surface layers are formed of lignocellulosic materials such as wood chips, wood shavings or wood waste associated with gypsum binder in an amount of 30 to 50% of the total thatch depth of 65 to 75% of the total weight of thatch. The sheathed building board may have surface layers embossed, surface-coated or even impregnated throughout.

The present invention solves an increase in the usability of softwood fiber boards and the like while maintaining their insulating properties. At the same time, it extends the possibilities of their application by combining a soft thatched as a middle layer with double-walled sheaths made of pilinosad material, which proves to be a higher effect of the present invention. Constructed in this way, the new composite board, while maintaining insulating properties, increasing strength, abrasion resistance, wide surface treatment options, exhibits reduced flammability and increased resistance to organisms without emission of pollutants and at low bulk density, which are essential advantages of the present invention.

Sheathed building thatch can be produced with an untreated surface corresponding to the character of the mixture of sawdust and gypsum, i.e. relatively rough or bilaterally smooth surface treated with gypsum or embossed in one pressing operation. Shavings, chips and other lignocellulosic particles or fine-grained wastes can be used instead of sawdust in the surface layers. Raw untreated and surface-treated thatch can be further surface-treated by virtually all applied processes, e.g. dyeing, painting, veneering, wallpapering, etc. The impregnation of boards in the whole mass or only on the surface is carried out against moisture and water.

EXAMPLE

2.7 kg of air-dried sawdust free of excess particles retained by a 10 X 10 mm sieve are mixed with 0.9 l of 10% sodium chloride solution and 2.2 l of water, then 5.4 kg of gypsum are added and mixed thoroughly. . One half of this mixture is layered on a 15 mm thick carpet on a stainless steel sheet, on which a soft 10 mm thick fibreboard moistened with water to 30% relative humidity is placed. The second half of the above-described mixture of sawdust, water, sodium chloride solution and gypsum is layered onto a softwood fiber that is 15 mm thick. The thus prepared assembly is cold pressed at 20 ° C for 15 min. in a tray press using 14 mm spacer strips. The resulting board is dried at 40 ° C to 3% humidity. A sheathed building board with an untreated surface of 15 mm thickness is formed, with a center layer having a depth of 60% of the total thatched rake and a weight of 30% / oz of the total thatched weight, and the surface layers having a depth of 40% .

Example 2

A 2 mm dry gypsum layer is applied to the stainless steel sheet. One half of the mixture, made up of 2.7 kg of air-dry sawdust, is deposited on the gypsum layer on a 15 mm thick carpet, which is freed of excess particles which are collected by a 10 X 10 mm sieve, 0.9 L of a 10% solution sodium chloride, 2.2 liters of water and 5.4 kilograms of gypsum. The mixture is prepared by mixing the ingredients, respectively, and in Example 1. A fibreboard is placed on the carpet so formed. 10 mm thick, moistened with water to 60% relative humidity. The second half of the above described mixture of sawdust, water, sodium chloride solution and gypsum is layered on a macrofibre thatched on the lower carpet to a layer thickness of 15 mm. A 2 mm dry gypsum layer is applied to the upper carpet thus formed. The thus prepared assembly is cold pressed at 20 ° C for 15 min. In a tray press using 14 mm spacer strips. The resulting 15 mm board is dried at 40 ° C to 3% humidity. In the case of the production of sheathed building boards of both sides, both stainless steel sheets are smooth. In the case of the production of embossed plates, both sheets are shaped.

The use of boards according to the invention is possible in the construction industry in wooden buildings and in interior lining with increased thermal and acoustic insulation. Also, thatch can be used to increase the fire resistance of buildings.

Claims (3)

1. Sheathed sheathed building board with an untreated, two-sided smooth embossed surface, characterized in that it consists of three layers of matter, the central layer having a thickness of 50 to 70% of the total depth of thatch consisting of a poppy fiber board weighing 25 to 35 % of the total weight of thatch and the surface layers are formed from lignocellulosic materials such as wood sawdust, woodblocks, chips or wood waste associated with gypsum binder in an amount of 30-50% of the total thatch thickness of 65-75% of the total weight of thatch. 2. The sheathed building board according to claim 1, characterized in that the surface layers are embossed. 3. A sheathed building board according to claim 1 or 2, characterized in that it is surface-impregnated or impregnated.