MULTILAYER EXTRUSION MOLDING DEVICE

• Main Authors: NAKAJIMA KAZUHARU, SHIMOBAYASHI TOMOO, SAITO TSUYOSHI, NISHIMURA TAKAO
• Format: Patent
• Language: English
• Published: 04.03.2013
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; 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

PROBLEM TO BE SOLVED: To provide a multilayer extrusion molding device of feed block system allowing acquisition of a multilayered film uniform in width-wise thickness of respective layers even when applied to coextrusion large in difference in flow characteristics between resins and difference in thickness between layers.SOLUTION: The feed block 2A includes junction sections C1-C3 where flat sub passages 22 of the same width obliquely join on a plurality of parts in a flat main passage 21 linearly communicating with an extrusion passage of a single-layered T die. The first-stage junction section C1 includes a main passage chalk bar 3 entering and exiting the main passage 21 from the side of the sub passages 22 to expand and compress the passage sectional area in a thickness direction, and a sub passage chalk bar 4 entering and exiting the sub passages 22 to expand and compress the passage sectional area in the thickness direction. Both of the chalk bars 3, 4 are divided into three or more sections in a width direction. The second-stage and succeeding junction sections C2, C3 each includes a sub passage chalk bar 5 entering and exiting the sub passages 22 to expand and compress the passage sectional area in the thickness direction and divided into three or more sections in the width direction.