| 摘要 |
PROBLEM TO BE SOLVED: To realize the formation of multilayered laminates, the number of laminations of which are different from one another, from the combination of a plurality of resins by a method wherein a plurality of spiral flow path grooves, the depth of each of which gradually becomes shallower, are formed on an inside die ring side between an inside die ring and an outside die ring. SOLUTION: When the distances between the starting points of spiral flow path grooves 24a and 24b and the arriving position on an inner surface under the condition that an inside die ring 122a is rotated to positive direction become longer than those under the condition that the inside die ring 122a stands still, a development angle (ω) becomes larger. When the distances under the condition that the inside die ring 122a is rotated to negative direction become shorter, resulting in becoming the development angle (ω) smaller. Thus, by changing the rotational direction of the inside die ring 122a, the development angle (ω) of the leaking resin can be increased or decreased, resulting in allowing to increase or decrease the number of laminations to the direction of the thickness of a film at the specified planar position. |
