DE1196366B - Process for the production of chipboard and chipboard bodies, primarily of low specific weight - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B 29 j

German KL: 39 a7 - 5/00

Number:
File number:
Registration date:
Display day:

1196366 H32391Ic / 39a7 February 12, 1958 July 8, 1965

The additional patent application H 28845 Ic / 39a ⁷ relates to a process for the production of pressure-resistant chipboard and chipboard bodies, primarily of low specific weight, from wood chips, fibers or other comminution products of vegetable raw materials commonly used for chipboard production and small amounts of binder preparation with an additive, especially after pressing or , gas-forming foaming agent according to patent 1147 745 that becomes effective during the heating of the blanks. but with the wood substance (the chips or the like) not or only slightly gluable plastic is added, preferably in the form of small pearls or grains, which in the foamed state after heating the pores and cavities remaining in the compact at least in the majority or substantially, if necessary with the formation of branches and with welding with their peers at points and surfaces of contact.

As a result, depending on the quantity ratio, chips or the like to the foamable plastic body to obtain that either more than one chip material with at least far-

Process for the production of chipboard and chipboard bodies, mainly low specific gravity

Addition to additional registration: H 28845 Ic / 39 a7 - Interpretation document 1192402

Applicant:

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

Named as inventor:

Dipl.-Ing. Max Himmelträger, Baiersbronn (black and white); Dr. Gustav Hagen, Dr. Otto Froede, Ludwigshafen / Rhine

»5 substances or preparations that are used for binding with the chips or with the glue are not or only slightly capable.

Examples. for foam or foamable substances that are used in processing the wood chips or the like. going filled and supported cavities 30 after their adhesion z. B. with a 50% dry or more than a synthetic foam with embedded urea-formaldehyde glue

Polyvinyl chloride paste, moltoprene foam, phenol-35 plastic foam, protein foam, latex foam or their foamable preparations, or viscose, which is used as a foaming agent and is used as a foaming agent to neutralize and release the carbonic acid in the Acid-releasing agents are added to the heat. To add. In these preparations, the synthetic foam and viscose foam can already be foamed or pre-foamed or, with no additional effort, can be used for good gluing with the simultaneous supply of foaming or wood chips. Also be unfoamed when using blowing agents. The agents used to prepare binders and foams, the agents, solvents, plasticizers used to prepare each other, have no affinity for glueing, for example emulsifiers and other dispersants can be by adding solvents that act on both substances, which improve the gluing ability of the solvent or the like. a mutual anchoring in foam or foamable material to bind the touching boundary surfaces caused by means of or to the chips or be destroyed if the gluing is desired,
better, or it can also be done - A particularly good gluing of the three components

ligende means of processing the foam or chips, glue, foam with each other be added foamable substance. On the other hand, obtained if the binder and the foam can but also foam or foamable preparation on the same or on relatives

... 509599/371

scaffold-forming chips are to be addressed. However, the three named are always in the bodies Components: chips or the like, binding agent, synthetic foam present or involved in the construction.

It has now been found that it is particularly advantageous to give the chip-glue mixture the foamable Plastic in liquid, wide, syrup-like, paste-like or similarly prepared form

Basics are built. For example, a urea glue commonly used in chipboard production can be used as a binder and a also based on a urea-formaldehyde condensation product, with the necessary additives provided processing serve. It can also use a melamine resin as a binder and a suitable one Urea resin processing find use as foam and vice versa. Binders and Foam processing can both, for example, also on phenol-formaldehyde condensation products if a particularly good gluing of all three components is desired will.

Even if the foam or foamable substances mentioned so far as examples are more organic Are nature or plastics and these are known to have a special meaning, so is the invention but by no means limited to these substances, because also foamable preparations ao of substances of an inorganic nature for the production of the three-component body according to the additional patent application can be used. For example, you can use one of the above Wood chips or the like with a predominantly high-percentage aqueous plaster of paris paste have binders Add foaming agents, if necessary already in the foamed or pre-foamed state, which, if necessary, foams completely during hot pressing and during or after hot pressing finally hardened. Although such gypsum preparation is known to have some binding forces are inherent, nevertheless an example of a foam is given in the above at the same time, which with the Chips and also with the binder does not form a remarkable gluing. By adding a Small amount of that type of binder, which is sprayed onto the chips or the like, for preparing plaster of paris However, the gluing ability of this and similar cavity scaffolding agents can affect both the Chips as well as to the binder, if desired, can be effected or considerably improved.

Claims (8)

Claims: 45 1. 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 using one of the chips or the like before, during or after the adhesion Heat-foamable plastic to be added with the binder preparation preferably in the form of small pearls or grains according to additional patent application H 28845 Ic / 39a, characterized in that the chips or the like. Before, at or preferably after lending a foam or foamable substance in liquid, pulpy, syrupy or paste-like or similar form or preparation is added during or after the Compression and / or heating of the moldings hi foam form their pores or cavities Solidified in a bridge-like or honeycomb-like manner. 2. The method according to claim '!., Characterized in that that the liquid, pulpy, syrupy or similar preparation added to the chip binder mixture forms foam Contains agents which, if appropriate under the action of heat, cause foaming. 3. The method according to claim 1 or 2, characterized in that the foamable Processing in pre-expanded state is added to the chip binding agent mixture. 4. The method according to claim 1 or 2, characterized in that the foamable Preparation is added to the chip binding agent mixture in a fully foamed state. 5. The method according to any one of the preceding claims, characterized in that the liquid, pulpy, syrupy or similar preparation as a dispersant, solvent, emulsifier or additives (e.g. solvents or swelling agents) which reduce the gluability between enable or improve the foam and the binder. 6. The method according to any one of the preceding claims, characterized in that binder and foam preparation on the same basis, e.g. B. a phenol-formaldehyde condensation product, are constructed. 7. The method according to any one of the preceding claims, characterized in that as foaming like substance mineral materials such as plaster of paris, concrete, silicates and the like will. 8. The method, preferably according to claim 7, characterized in that a little of that for the chip gluing into the foam preparation binder used is included. Considered publications:
German patent specification No. 805 708.