DE1192402B - Process for the production of chipboard and chipboard bodies, primarily with a low specific weight - Google Patents

Description

GERMAN

PATENT OFFICE

EDITORIAL

German class: 39 a7- 5/00

Number:
File number:
Registration date:
Display day:

1192402 H28845Ic / 39a7 December 17, 1956 May 6, 1965

The patent 1147 745 relates to a method for Production of pressure-resistant chipboard and chipboard bodies, primarily of low specific weight, in which the before the blank structure with od against the wood substance, the fibers. Like. by far smaller amounts of binding agent to be adhered to wood chips, fibers or those for the chipboard production common comminution products of vegetable raw materials with a binder preparation be provided, which is characterized in that the processing primarily after pressing or gas-forming foaming agents in that amount are added that the remaining in the compact between the build-up particles Pores or cavities like a honeycomb or bridge with the one solidifying in this form during heating Binder are filled.

When carrying out the process it has been shown that some plastics are particularly good are suitable for the formation of foams with a relatively high compressive strength, but are suitable for gluing the chip or fiber materials used are less or not at all suitable. The invention shows a way to implement the basic idea of the main patent, namely education in particular lighter and at the same time pressure-resistant chipboard body, the pore structure of which is made possible by pressure-resistant plastic foam is filled and thus supported. It consists in the mentioned plastic foam exclusively or mainly only for filling and supporting cavities in the compacts use the gluing of the chips to each other and to the plastic foam, but through one to effect specially introduced binding agent.

The technical and economic importance of the invention lies in the fact that it is possible in this way is, chipboard and chipboard moldings also with very low densities and thus low Production of raw material costs with technically usable strength properties. The usage of wood-chip materials of lower specific gravity has so far failed primarily because of the too low Compressive strength, while the flexural strength is still quite sufficient for numerous purposes would.

The method can be carried out in a simple manner as follows: Wood chips are in a known manner in a mixing device with a known binder, e.g. B. a urea-formaldehyde condensation product mixed. The binding agent is introduced in a known manner. Processes for the production of chipboard and chipboard bodies, primarily low specific gravity, are used

Addendum to the patent: 1147 745

Applicant:

Dipl.-Ing. Max Himmelhub, Baiersbronn (Black Forest), Saarstr. 7th

Named as inventor:

Dipl.-Ing. Max Himmelträger, Baiersbronn (black and white);

Dr. Gustav Hagen,

Dr. Otto Froede, Ludwigshafen / Rhine

for example by injecting the liquid synthetic resin or by metered addition of powdery synthetic resins. Before, during or after the Introducing the binder is a foamable plastic, for example in the form small beads or grains, added during the subsequent pressing process of the chipboard body foam up, with at least the majority of them as spatial honeycombs or bridges Fill the cavities between the chips and glue them to each other as well as to the introduced binding agent. Depending on the ratio of chips to foamed plastic a body is obtained that is more of a chipboard material filled and supported by foam Represents cavities or a synthetic resin foam with embedded framework-forming chips. In the latter case, the gluing of the chips with one another is less important than the immediate The individual foamed plastic beads are welded together and the Chips with these foam beads, whereby in extreme cases even the gluing of the chips with one another can be completely or largely eliminated; in the first case, the extreme is a normal chipboard body, its structure is formed primarily through the known gluing of the chips with one another through the urea-formaldehyde condensation

509 568/400

product or a similar binding agent is required, while the essentially filling the cavities, foamed plastic beads or the like only partially or not at all with one another weld. Between "the two extremes, all conceivable incidents are possible.

In the main patent it is already pointed out that with ordinary chipboard bodies the introduced The lower the binding agent, the worse the efficiency Weight of the body, d. H. the more porous its structure is. The binder only works where it is between the points of contact of two chips is embedded, while it is on the walls of the cavities remains without a gluing effect and only more or less lines these cavities. if now all or the majority or the most essential of these cavities by a plastic foam are filled, which is applied to the walls with a certain pressure during foaming, So there is glued plastic foam with binding agent, whereby an excellent increase in strength of the overall structure comes about. The body, which in itself consists of three components, then forms an entirely closed and uniform structure and not only required in the unit of volume - absolutely calculated - fewer raw materials than a normal chipboard body of the same strength, which only consists of the two components chipboard and binder, but it can also be the ratio of Binder can be reduced to chips, while still having bodies with high-quality mechanical properties can be obtained.

The importance of this three component process With the current state of the art, it is primarily in the field of Hoizspan materials, but the process is basically not based on organic

Chip and fiber materials limited; it can mutatis mutandis also using inorganic substances, e.g. B. fiberglass, asbestos, rock wool, exercised will.

Claims (1)

Claim: Process for the production of pressure-resistant chipboard and chipboard bodies, mainly low specific gravity from wood chips, fibers or others commonly used for chipboard production Comminution products of vegetable raw materials and small amounts of a binder preparation with an additive in particular after the pressing or during the heating of the blanks, the gas-forming foaming agent that becomes effective in the one Amount that the pores or cavities remaining in the compact between the build-up particles honeycomb or bridge-like with the binding agent solidifying in this form during heating are filled in, according to patent 1147 745, characterized in that the wood chips or the like. Before, during or after their adhesion with a binder, a foamable material which is foamable by the action of heat, is involved in the process unifying or gluing with the binding agent, but with the wood substance (the chips or the like) not or to me slightly more gluable Plastic is preferably added in the form of small beads or grains that are foamed in the At least the pores and cavities remaining in the compact after heating in the MehrzaM or essentially, possibly with the formation of ramifications and by welding with their own kind at points of contact and surfaces. 509 568/400 4.65 © Bundesdruckerei Berlin