Injection molding method forming strengthened weld line

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface

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2643288, 26432812, 425577, B29C 4537, B29C 4556

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active

058339132

ABSTRACT:
An injection molding process for a thermoplastic resin using a mold having disrupters in the location in which weld lines will be formed. Molten resin is injected into a mold cavity as at least two separate streams having a flow front and a flow core. The mold cavity is filled with resin from each of the streams whereby a weld line will be formed at an interfacial area where the flow fronts meet. The disrupters located perpendicular to the resin flow direction disrupt the flow fronts prior to the interfacial area. The flow fronts are thereby fragmented. This allows the flow front fragments, and the flow cores to be more homogeneously dispersed within the interfacial area thereby increasing the weld line strength and appearance.

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