Method for preventing uncontrolled polymer flow in preform neck

Details Method for preventing uncontrolled polymer flow in preform neck Method for preventing uncontrolled polymer flow in preform neck

1996-08-22

2000-05-16

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

2643288, 26432812, 425130, B29C 4516

Patent

active

060633255

ABSTRACT:
A method of reducing uncontrolled flow of a molten polymer during the packing and cooling stage of an injection molding cycle. A plurality of polymers are injected between a mold cavity and core for making a multilayer plastic article such as a preform, having an exterior layer of a first polymer and an interior layer of a second polymer. In a tapered region of the mold, a minimum width of the tapered region is selected to prevent the second polymer from developing an enhanced leading/trailing edge effect which causes the second polymer to reverse flow during the packing and cooling stage. The method is particularly useful for making preforms for blow molded containers, such as a ketchup container, having a relatively long and thin neck profile. In addition, the method maintains the interior (barrier) layer a minimum distance from the top sealing surface of the preform, in order to prevent defective heat-bonded seals.

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patent: 5539675 (1996-07-01), Carroll, Sr. et al.
patent: 5676267 (1997-10-01), Slat et al.

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