Querspritzkopfdüse und Verfahren zum Herstellen eines Strukturkörpers aus Kunststoff verstärkt mit langen Fasern

• Main Authors: AMAIKE, TAKESHI, SHIRAI, YOSHIMITSU
• Format: Patent
• Language: German
• Published: 30.11.2000
• 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

A cross-head die (4) which is used for the manufacture of a resin structure reinforced with long fibers, in which manufacture a continuous fiber bundle (5) is continuously pulled through a passage provided in the die (4), while a thermoplastic resin melt is discharged into the passage to be impregnated in the traveling fiber bundle (5). The passage has an inlet (402) and an outlet (403) in the same plane and meanders with a predetermined pitch in such a manner that the passage (400) crosses the plane a plurality of times alternately from the lower side of the plane to the upper side and vice versa so as to form a plurality of top portions (404-406) and a plurality of bottom portions (407-409). The height (h1-h6) of the top or the bottom of the top or the bottom portion with which the continuous fiber bundle first contacts, as measured from the above plane, is greater than the height of the top or the bottom of the top or the bottom portion with which the continuous fiber bundle last contacts. The height of the top or the bottom of an intermediate top portion or a bottom portion is the same as the height of the top or the bottom of either one of its neighboring top or bottom portions, or diminishes in a downstream direction from the inlet to the outlet. A method for manufacturing a resin structure reinforced with long fibers using such a die is also described. The cross-head die (4) enhances impregnation without causing drawbacks such as rupture of fiber bundles when continuous fiber bundles (5) are impregnated with a thermoplastic resin melt in the die.