Title: Positive displacement molding of plastic parts

Abstract

The present invention is a method and apparatus for molding plastic parts and placing and orienting reinforcing fibers within structurally thin sections. More specifically, the method of the present invention is a molding technique wherein positive displacement is applied to incremental sections of a charge (plastic mixed with reinforcing fibers), thereby sequentially forming the desired part and placing reinforcing fibers within structurally thin sections. The apparatus of the invention is a moveable ram that may be tapered and that is in contact with the charge during forming.

Inventors:

Gordon, N. Ross; Dilly, Scott J.; Simmons, Kevin L.; Woodcock, Leslie J.

Issue Date:

2018-07-10

Research Org.:

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1463597

Patent Number(s):

10016914

Application Number:

07/923,416

Assignee:

BATTELLE MEMORIAL INSTITUTE (Richland, WA)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29C - SHAPING OR JOINING OF PLASTICS

B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29K - INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

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B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29C - SHAPING OR JOINING OF PLASTICS

B29C70/462 - {Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames}
B29C2043/3628 - {moving inside a barrel or container like sleeve}
B29C33/22 - by rectilinear movement
B29C43/361 - {with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
B29C2033/422 - {Moulding surfaces provided with a shape to promote flow of material in the mould cavity}
B29C45/56 - using mould parts movable during or after injection, e.g. injection-compression moulding {
B29C70/00 - Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
B29C33/40 - Plastics, e.g. foam or rubber
B29C2045/5695 - {using a movable mould part for continuously increasing the volume of the mould cavity to its final dimension during the whole injection step}

B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29K - INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

B29K2105/12 - of short lengths, e.g. chopped filaments, staple fibres or bristles

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DOE Contract Number:  

AC06-76RL01830

Resource Type:

Patent

Resource Relation:

Patent File Date: 1992 Jul 31

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 42 ENGINEERING