CO-INJECTION MOLDED MULTI-LAYER ARTICLE WITH INJECTION-FORMED APERTURE BETWEEN GATE AREA AND PERIPHERAL EDGE

摘要

Methods and systems for co-injection molding multilayer articles having one or more molded apertures disposed between a gate region and a peripheral region of the article are disclosed. The articles include an interior layer disposed between an inner layer and an outer layer. An article has interior layer coverage over at least 98% of a perimeter of a cross-section of the article downstream of the one or more molded apertures. A method includes modifying fluid flowing past an aperture-forming region of a mold cavity to compensate for the drag of the aperture-forming region on the velocity of the fluid flowing proximal to the aperture-forming region.

主权项

1. A mold for molding a multilayer co-injection molded article that includes a first polymeric material and a second polymeric material, the mold comprising a mold cavity including:
a gate region; a peripheral region: an aperture-forming region disposed between the gate region and the peripheral region and configured to form an aperture in a resulting molded article; and an enhanced velocity region proximal to the aperture-forming region, the enhanced velocity region configured to increase a flow velocity of a multilayer flow proximal to the aperture-forming region to form an interior layer of the second polymeric material between an inner layer of the first polymeric material and an outer layer of the first polymeric material with the interior layer extending over at least 95% of a perimeter of a cross-section of the resulting molded article downstream of the aperture.