Extrusion die head
AssigneeToyo Seikan Kaisha, Ltd.
InventorsMitsuo Kuwazuru, Jou Honda, Takuji Hashimoto
Life of this patent
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Abstract
When extrusion molding is conducted continuously for a long period of time, in order to prevent a die drool from being generated at an outlet of an extruder, to a shell 2 in which an outlet 3, through which a melt-kneaded resin material is extruded by an extruder, is formed, a plate-like shell tip 6 in which an opening 7 which is arranged such that it surrounds the outlet 3 along the circumference thereof is detachably attached, and non-sticky coating is applied at least along the outer surface of the core tip.
Claims14
An extrusion die head adapted to attach to a front end part of an extruder, comprising:
- a shell having an outlet for extruding a resin material which has been melt-kneaded by means of the extruder;
- a plate-like shell tip having an opening to be arranged along a circumference of the outlet in such a manner that the opening surrounds the outlet, the shell tip being detachably attached to the shell;
- a tapered part provided in an opening side of the shell tip and having a diameter increasing along an extrusion direction of the resin;
- and
- a non-sticky coating applied at least along an inner circumference of the opening formed in the shell tip,
- wherein an angle of inclination of the tapered part relative to a surface of the shell tip on which the shell tip is attached to the shell is equal to or smaller than 20°.
Dependencies are inferred from the claim text.