Rohm Gmbh Chemische Fabrik

Roehm Gmbh & Co Kg

Roehm Gmbh Chemische Fabrik

Karl-Heinz Fehring

Alexander Theil

Friedrich Hanstein

Friedel Emmerich

Manfred Rimpl

The invention concerns a method for the production of a flat composite ( ) from plastic parts by means of a thermal adhesion of two plastic parts ( &prime;), heated on one side of their surfaces ( &prime;), consisting of plastics A and B, wherein the surfaces ( &prime;) are heated on the adhesion side to surface temperatures of 10 to 100&deg; K. above the Vicat softening points VET (according to DIN ISO 306) of the pertinent plastics A and B, provided that the plastic parts ( &prime;) retain their original shape during the preheating phase, and are pressed between a pair of rolls ( ), at an advance rate between 5 and 200 mm/sec and with a pressing force between 10 and 500 N acting on the roll ( ); preferably, the plastics ( &prime;) exhibit engraving or embossing ( &prime;), with which composite ( ) can be produced with a three-dimensional inclusion ( ) of a defined shape; furthermore, a flat or elongated object ( ) is embedded between the plastic parts ( &prime;) to be adhered during the adhesion of the composite ( ).

Method for the thermal adhesion of parts made of acrylic plastic and parts made of engineering plastics

The invention relates to a method for the production of flat laminates (5) from polymethacrylate plastic, by thermal adhesion of at least two parts (1) of polymethacrylate plastic heated at their surface, with the characterizing features that the parts (1) of polymethacrylate plastic, which have been preheated to surface temperatures of 130.degree. to 200.degree. C. on the adhesion side (1a), and which maintain their original shape during the preheating phase, are pressed together between a pair of rollers (2, 3), of which at least one roller (2), by means of which the pressure force (4) is exerted, is mounted in movable manner, at a feed velocity being between 5 and 200 mm/s and a pressure force acting on the roller (3) between 10 and 500 N. Preferably, during the adhesion of the laminates (5), flat or oblong objects (8) with thicknesses which are allowed to amount to a maximum of 50% of the thickness of the parts (1) of polymethacrylate plastic, are embedded between the parts (1) of polymethacrylate plastic which are to be adhered together.

Method for thermal adhesion of acrylic plastic parts

In forming operations on plastic sheets, plates, strips, or tubes (particularly, having highly glossy surfaces) by molding or forming tools, the surface qualities, particularly the gloss, remains undamaged if; (a) the tool is maintained at a temperature in the thermoelastic state region of the plastic until disengagement of the plastic from the tool; and (b) the formed plastic is cooled at its rear side to below the softening temperature, and is disengaged from the forming tool while said tool is hot.

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Stockstadt/Rh., Germany

Karl-Heinz Fehring