Resin molding method, die device, and resin molded article
AssigneePanasonic Corporation
InventorsKeizou Matsumura, Taishi Maruichi
Life of this patent
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Abstract
Flow gates 5 capable of protruding and retracting are provided in a cavity 9 of a die 2 to control a resin filling path. The generation of welds or orientation lines in a resin flow pattern is allowed only in an area containing uneven portions outside a design surface but is not allowed in other areas. The area containing welds or orientation lines in a resin flow pattern is covered with a separate component having a design surface, thereby achieving a desired metallic appearance.
Claims7
A resin molding method of injecting molten resin into a cavity formed between opposed dies to form a resin molded article,
- the resin molding method comprising the steps of:
- increasing a temperature of at least a die surface facing the cavity to at least a glass transition temperature of resin;
- injecting the molten resin into the cavity in a state in which at least one flow gate for restricting a resin flow is protruded into the cavity to restrict the resin flow to a predetermined restricted area, the at least one flow gate being capable of protruding and retracting into/from the cavity;
- removing a restriction by retracting the flow gates from the cavity to a position not restricting the resin flow after start of injection in the injecting step;
- cooling and solidifying the resin in the cavity;
- and
- collecting the solidified resin from the dies to obtain a resin molded article.
A die device comprising:
- a pair of dies detachably opposed to each other, the dies forming a cavity filled with molten resin;
- and
- flow gates capable of protruding and retracting into/from the cavity,
- wherein the flow gates protrude into the cavity to block a resin flow to a predetermined restricted area at start of injection of resin into the cavity, and the flow gates retract from the cavity to allow passage of the resin flow into the restricted area when the resin joins outside the restricted area.
A resin molded article comprising a design surface area and an uneven area containing uneven portions such as a rib, a boss, and a hole,
- wherein the uneven area contains at least one of a weld and an orientation line in a resin flow pattern and is covered with a separate component.
Dependencies are inferred from the claim text.