| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed block the maintenance of which is easy because of a simple structure and which dissolves the interlayer instability phenomenon at the time of coextrusion molding to afford a product stable in appearance quality. SOLUTION: In the feed block used for coextrusion molding wherein resin materials that flow through a plurality of resin flow passages are made to be laminar flow and to join, a widening part is equipped for at least either of the resin passages, the widening part which, near the junction between one resin passage and another resin passage, gradually widens the passage width toward the junction. COPYRIGHT: (C)2006,JPO&NCIPI |
