The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2015
Filed:
Mar. 14, 2011
Geoffrey York, Walsall, GB;
Esak Shabudin, Banbury, GB;
Geoffrey York, Walsall, GB;
Esak Shabudin, Banbury, GB;
Kraft Foods R & D, Inc., Deerfield, IL (US);
Abstract
The present invention relates to advancements in injection molding and in particular to a method and apparatus for co-injection molding articles of complex non symmetrical geometry. The method forms a multilayer injection molded article comprising an outer skin of a first material and a central core of a second material which is encapsulated by the outer skin. The first and second materials are injected in a single stream into a cavity of an injection mold, with the second material encased within the first material. The flow of the stream is controlled by means of flow paths within the mold cavity such that both the first and second materials are present in at least one first area of the mold cavity and that only the first material is present in at least one second area of the mold cavity. The flow paths include at least one primary flow path in the first mold cavity area which divides into at least two secondary flow paths. The resistance of a first of the secondary flow paths in the at least one first mold cavity area is reduced relative to that of a second of the two secondary flow paths, which is in the at least the second mold cavity area.