Blown film forming apparatus
AssigneeSumitomo Heavy Industries Modern, Ltd.
InventorTakahiro Shiota
Life of this patent
Estimating the term…
Abstract
Provide is a blown film forming apparatus including a die including a columnar inner peripheral member and a cylindrical outer peripheral member that surrounds the inner peripheral member, and extruding a resin from a lip formed between the inner peripheral member and the outer peripheral member, and a plurality of die lip drive mechanisms including a fluid pressure actuator as a drive source and adjusting a lip width by applying a radial load to the outer peripheral member, in which the outer peripheral member includes a plurality of load receiving portions to which a load is applied by the die lip drive mechanism, and a stiffness reducing portion that is provided between the plurality of load receiving portions.
Claims19
A blown film forming apparatus comprising:
- a die including a substantially columnar inner peripheral member and a substantially cylindrical outer peripheral member that surrounds the inner peripheral member, and extruding a resin from a lip formed between the inner peripheral member and the outer peripheral member;
- and
- a plurality of die lip drive mechanisms including a fluid pressure actuator as a drive source and adjusting a lip width by applying a radially outward tensile load to the outer peripheral member,
- wherein the outer peripheral member includes a plurality of tensile load receiving portions to each of which a tensile load is applied by the respective die lip drive mechanism, and a stiffness reducing portion that is provided between the plurality of tensile load receiving portions.
Dependencies are inferred from the claim text.