METHOD FOR PRODUCING A COMPOUND FROM A FLOWABLE PLASTIC MATERIAL AND A SOLID FIBER CORE BY MEANS OF EXTRUSION AND DEVICE FOR CARRYING OUT SAID METHOD

• Main Author: CHSZANIECKI, SIEGFRIED
• Format: Patent
• Language: English; French
• Published: 08.02.2005
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

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 extrusio n 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 plasti c material in the extrusion chamber. According to the invention, for wetting with the plastic material, the continuous fibers are led through a roller nip whi ch 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, surround ed 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 whichis in transporting connection with the lateral opening (3).