Insert Molding Using Single Mold and Support Mold
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Solution Overview
Problem
Traditional insert molding methods require expensive and specialized two-shot or multi-shot injection molding machines and involve multiple molds, leading to inefficiencies and potential moisture issues that affect the quality of the seal between molding steps.
Innovation Solution
A method that secures an insert within a mold using a support mold, allowing for a single mold cavity to perform a two-shot molding technique, where a first resinous material covers one surface of the insert, and a second resinous material is injected into a recess formed after removing the support mold to encase the other surface, eliminating the need for multiple molds and reducing moisture exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional two-shot or multi-shot injection molding machines are used, then insert molding can be performed, but the equipment cost and device complexity increase significantly
Solution Approach 1:
The patent combines multiple molding operations into a single injection molding machine by integrating a movable support mold that can be repositioned between molding shots, eliminating the need for separate molds and reducing equipment complexity while maintaining insert molding capability
Solution Approach 2:
The support mold is designed to be movable rather than fixed, allowing it to be repositioned from a first position during the first shot to a second position during the second shot. This dynamic repositioning enables a single mold cavity to perform functions that traditionally required multiple specialized molds
2Ease of manufacture
If multiple molds are used in traditional insert molding, then different surfaces of the insert can be molded, but the number of molds and processing steps increase
Solution Approach 1:
A single mold cavity is designed to perform multiple functions by repositioning the support mold between shots. The same mold cavity that supports the insert during the first shot is reused during the second shot after repositioning, eliminating the need for multiple specialized molds and reducing processing steps
3Ease of manufacture
If traditional multi-shot methods are used, then composite parts can be formed, but moisture exposure and seal quality issues occur
Solution Approach 1:
The molding process maintains continuity by keeping the insert and first molded portion within the same controlled mold environment throughout both shots. The support mold is repositioned rather than removed, preventing moisture exposure and maintaining seal integrity while forming the composite part
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies and cost-reduces the insert molding process, ensuring a strong and watertight seal without the need for expensive machinery, while maintaining texture and color consistency between molding steps, and preventing moisture-related quality issues.
Implementation Method 1
injecting a first resinous material into the mold... injecting a second resinous material into the recess
Data Source
AI summary
The embodiments described herein relate to insert molding methods. The methods involve partially or fully encasing an insert within a thermoplastic material, forming a composite part that includes the insert and the molded thermoplastic material. Methods described provide a number of improvements over traditional insert molding techniques. In specific embodiments, a two-shot molding process is used whereby a first shot is formed on a first portion of the insert and a second shot is formed on a second portion of the insert. The insert molding processes can be performed using a single mold during the first and second injection molding processes.