Injection Molding Process for Molding Mechanical Interlocks Between Molded Components

US20090081407A1Inactive Publication Date: 2009-03-26CSP TECH INC
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  • Injection Molding Process for Molding Mechanical Interlocks Between Molded Components
  • Injection Molding Process for Molding Mechanical Interlocks Between Molded Components
  • Injection Molding Process for Molding Mechanical Interlocks Between Molded Components

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[0037]The present technology describes methods for molding a molded part formed from at least two materials that exhibit different chemical and / or physical properties. One of the materials is molded to form a first portion of the molded part which includes an interfacial surface and at least one interlock cavity adjacent to the interfacial surface. The other material is molded to form the remainder of the molded part and flows into the interlock cavity created in the first portion of the molded part. When the second material solidifies within the interlock cavity, it creates a mechanical interlock at the interfacial surface that prevents the two materials from being separated. The mechanical interlock is not dependent on adhesion between the materials.

[0038]In one embodiment of the present technology, a passive interlock is created at the interfacial surface by forming the interlock cavity so as to have an opening at the interfacial surface that allows the second material to flow in...

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Abstract

A two-shot or multi-shot multi-material injection molding process is provided. The process allows dissimilar materials to be injection molded to form a single, injection molded part by creating a structural interlock between the materials to prevent the materials from separating. The structural interlock is formed by forming at least one interlock cavity adjacent to a interfacial surface of a first portion of a molded part molded from a first material, and injecting a second, different material into the mold so that the second material flows into the interlock cavity and fills it. Solidification of the second material in the interlock cavity formed by the first material creates the structural interlock between the two materials.

Description

RELATED APPLICATIONS[0001]This patent application makes reference to, claims priority to and claims benefit from U.S. Provisional Patent Application Ser. No. 60 / 746,438 filed on May 4, 2006.FIELD OF THE INVENTION[0002]The present technology relates to a method of molding different materials to form an individual injection molded part. More particularly, the present technology relates to an injection molding method that creates a structural interlock between two different materials that allows the two different materials to be used to form a single, injection molded part.BACKGROUND OF THE INVENTION[0003]Consumer are demanding smaller bulk packages that incorporate greater functionality (i.e., one-by-one product presentation and resealability). These bulk packages, especially bulk packages that must also have other functional requirements, such as moisture-resistance and resealability, is particularly challenging to produce because the functional requirements often necessitate the use...

Claims

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Application Information

Patent Timeline
26 Mar 2009
Publication
US20090081407A1
IPC
B29C39/02; B32B3/06
CPC
B29C37/0082; B29C45/1657; B29C2045/1668; Y10T428/24331; Y10T428/24942; Y10T428/24; Y10T428/192; Y10T428/249921
Inventors
GIRAUD, JEAN-PIERRE