Method for producing a compound from a flowable plastic...

B - Operations – Transporting – 29 – C

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Details

B29C 47/02 (2006.01) B29B 15/10 (2006.01) B29B 15/12 (2006.01) B29C 47/10 (2006.01) B29C 47/40 (2006.01)

Patent

CA 2355833

The invention relates to a method for producing a compound from a flowable plastic material and a solid fiber core of a reinforcing material, especially glass fibers, by extruding the plastic material from the extrusion chamber, continuous fibers of the reinforcing material which have previously already been wetted with the plastic material being fed to the plastic material in the extrusion chamber, and the continuous fibers being mixed with the plastic material in the extrusion chamber. According to the invention, for wetting with the plastic material, the continuous fibers are led through a roller nip which is formed between a pair of wetting rollers which are driven in opposite rotational directions and the surface of which has a coating of the flowable plastic material in a thickness which is sufficient for the constant filling of the roller nip with the plastic material. The invention also relates to a device for carrying out the method with a screw-type extruder (1), the extrusion chamber (2) of which, surrounded by an extruder barrel (8), has in addition to the entry opening and the exit opening for the extruded plastic material a lateral opening (3) for the feeding in of continuous fiber material, and with a wetting device (4) for the fiber material to be fed in, the outlet of which is in transporting connection with the lateral opening (3).

Procédé de fabrication d'une matière composite à l'aide de plastique fluide et d'une âme solide de fibres constituée d'une matière de renforcement, en particulier de fibres de verre, par extrusion du plastique provenant d'une chambre d'extrusion. Des fibres continues de la matière de renforcement qui ont préalablement déjà été mouillées à l'aide du plastique sont introduites dans le plastique dans la chambre d'extrusion et les fibres continues sont mélangées avec le plastique dans ladite chambre d'extrusion. Selon la présente invention, pour le mouillage à l'aide du plastique, les fibres continues sont amenées à passer par un espace formé entre deux cylindres de mouillage qui tournent dans des sens opposés et dont la surface est revêtue d'une couche de plastique fluide dont l'épaisseur suffit pour que le plastique remplisse en permanence l'espace entre les deux cylindres. La présente invention concerne en outre un dispositif permettant de mettre en oeuvre ledit procédé, qui comprend une extrudeuse (1) à vis dont la chambre (2) d'extrusion entourée par un carter (8) d'extrudeuse comporte, en plus de l'orifice d'entrée et de l'orifice de sortie pour le plastique à extruder, un orifice latéral (3) pour l'introduction de fibres continues, et une installation de mouillage (4) pour la matière fibreuse à introduire dont l'orifice de sortie se trouve en liaison de transport avec l'ouverture latérale (3).

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