FI59052C - FOERFARANDE FOER ATT AOSTADKOMMA EN PLANPRESSAD SPAONSKIVA MED RELIEFMOENSTRAD YTA - Google Patents

Description

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JgBa A 1 1 K 'UTLÄGGNI NGSSKRIFT 3 “U 3 έ C Patent granted 10 06 1931

Patent raeddelat (51) kv.hc.Vci.3 B 44 C 1/22

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_ '(44) Date of issue. -

Patent · och rcgittantyralsan 'Araekan utiagd och uti. * Kriftm pubUcerad 27.02.3l (32) (33) (31)

Sweden-Sweden (SE) 7502569-2 (71) RY Aktiebolag, Box 136, S-313 00 Oskarström, Sweden-Sweden {SE) (72) Olof Rickard Smedberg, Oskarström, Sweden-Sweden (SE) (7k) Oy Kolster Ab (5M Method for producing an embossed chipboard - Förfarande för att ästadkomma en planpressad spän-skiva med reliefmönstrad yta

The present invention relates to a method for providing an embossed flat-pressed particle board which has good properties in terms of both light and sound reflection and which, moreover, has an aesthetic appearance.

Flat-pressed particle boards are often used in the construction industry, e.g. for cladding walls and ceilings. The main advantages of the material are its cheapness; Particleboards are also easy to machine and have good insulating properties. The method of manufacture, pressing, usually gives the plates flat surfaces. In many cases, however, a certain embossing on the surface would be desired to reduce harmful reflections, improve acoustics, and possibly give an aesthetically pleasing appearance.

It is known to press embossments on the surface of particle boards, but this method is expensive because the tools become relatively complex. The patterns that appeared in this case have therefore been relatively simple and do not resemble a natural product.

2 59052

The method according to the invention is characterized mainly in that the raw material of the particle board consists of a dimensioned mixture of large and small chips, at least 10% of which exceeds 10 mm in length and to which a binder is added and pressed into a planar chipboard. Its other surface is then subjected to wear by rotating steel brushes. , which tear off less resistant parts of the chipboard surface.

According to the method of the invention, an even better and more pronounced effect is obtained in that the fibers of the particle board are wood chips of two or more types of wood with different abrasion resistances.

The embossed uneven wear caused by the steel brushes can also be increased by mixing the chip doses together with a binder, adding different amounts of adhesive to the different chip doses, which after curing or drying give different high wear resistance to different chip doses on the same sheet during subsequent treatment.

In a particularly suitable embodiment of the method according to the invention, it has been found that at least different amounts of binder are added to the chips on the outer layer of the board before compression so as to provide different high wear resistances in the particle particles in flat compression in a manner known per se, followed by less resistance to rotating steel brushes. wear so that an embossed surface is created.

The advantages of the method according to the invention are that no certain repetitive pattern is obtained, since all the chipboards become patterned differently and unevenly. The interconnection therefore results in a natural pattern, which also has the advantage of obtaining sharp light effects and a certain sound attenuation compared to flat surfaces. Since brushing with steel brushes can be started fully automatically at a suitable time in the manufacture of such chipboards, the cost of these embossed sheets is very low. Other measures, such as mixing chips of different lengths or chips from different types of wood or using chips with different gluing levels, are also low-cost.

59052 3

The process according to the invention thus gives a different and, in certain respects, improved product with a very negligible additional manufacturing cost.

Claims (4)

A method of producing an embossed chipboard, characterized in that the raw material of the chipboard consists of a dimensioned mixture of large and small chips, at least 10% of which exceeds 10 mm in length, to which a binder is added and pressed into a planar chipboard, the other surface of which is then is subjected to abrasive machining by means of rotating steel brushes which, by their action, tear off less resistant parts of the surface of the chipboard. A method according to claim 1, characterized in that the fibers of the particle board are wood chips of two or more types of wood with different wear resistances. A method according to claim 1, characterized in that the chip portions are mixed with a binder, wherein different amounts of adhesive are added to the different chip portions, which after curing or drying give different high wear resistance to different chip portions on the same board with steel brushes during subsequent treatment. Method according to Claim 1, characterized in that different amounts of binder are added to the chips at least in the outer layer of the board before pressing, so as to provide different high wear resistances in the chip particles in flat pressing in a manner known per se below, followed by treatment with rotating steel brushes. wear of less resistant parts so that an embossed surface is created.