EXTRUSION CONTROLLING METHOD FOR MULTILAYERED PARISON,申请号JP19910109826-传众专利搜索

EXTRUSION CONTROLLING METHOD FOR MULTILAYERED PARISON

申请公布号：JPH04316808(A)

申请号：JP19910109826

申请日期：1991.04.15

申请公布日期：1992.11.09

申请人：

JAPAN STEEL WORKS LTD:THE

发明人：ONO YOSHITAKA

分类号：B29B11/10;B29C47/06;B29C47/20;B29C47/50;B29C47/70;B29C47/92;B29C49/02;B29C49/04;B29C49/22;B29C49/78;B29L9/00;B29L23/00

主分类号：B29B11/10

摘要：<p>PURPOSE:To prevent the local material starvation and lens-like swelling in multilayered parison from developing by a method wherein the extrusion pressures of auxiliary material resin and of adhesive are prevented from apply ing to annular flow paths and the timing of the end of extrusion is controlled so as to bring the extrusion pressures among respective materials during the extrusion of parison within the predetermined ranges. CONSTITUTION:During the accumulation of respective materials in respective accumulators 32, 28, 30a and 30b, respective flow paths between an auxiliary material resin accumulator 28 and annular flow paths 2f, 6a, 6b, 6c and 2e and between adhesive accumulators 30a and 30b and the annular flow paths are blocked. At the start of the extrusion of the respective accumulators, the pre-set valve openings are given to the respective flow paths and the extrusion actions of the respective accumulators are started at the predetermined order and timings. Thus, the simultaneous extrusion of main material resin, the auxiliary material resin and the adhesive through an annular outlet 6d are started. During extrusion, the respective materials are extruded through the respective flow paths under pressures, each of which corresponds to the developmental pressure of each accumulator and its valve opening.</p>