Coated Component Injection Molding with Integrated Release
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Solution Overview
Problem
Current injection molding processes for coated components, such as plastic soles, face challenges with external release agents causing adhesion issues, irregular surfaces, and increased complexity and cost, especially in high-indexed rotary table processes where short operating times and damage-free demolding are required.
Innovation Solution
An automatic process involving a release agent composition applied to the molding tool, flashed, and then used in conjunction with injection and curing of materials within the tool, allowing for integrated coating during production without external agents, ensuring damage-free demolding and regular surfaces, and enabling recoating or adhesive bonding without costly cleaning steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external release agents are used to facilitate demolding, then demolding is enabled, but adhesion problems and irregular surfaces occur
Solution Approach 1:
The invention extracts and eliminates the external release agent from the process by integrating the release function directly into the coating composition applied to the component. This eliminates the need for separate release agent application and removal steps, while preventing adhesion problems and surface irregularities caused by external release agents.
Solution Approach 2:
The invention merges the release agent function with the coating composition into a single integrated system. The coating composition contains both protective/coating functions and release properties, eliminating the need for separate external release agent application and avoiding the problems caused by using two separate substances.
2Ease of operation
If external release agents are used, then demolding is facilitated, but cleaning processes and tool maintenance become costly and complex
Solution Approach 1:
The invention extracts the release function from external agents and embeds it within the coating composition itself. This eliminates the need for separate release agent application equipment and the subsequent cleaning processes required to remove external release agents from tools and components.
Solution Approach 2:
The coating composition provides self-release functionality, eliminating the need for external release agents and the associated cleaning and maintenance processes. The system serves its own release function through the inherent properties of the coating material.
3Ease of operation
If external release agents are used, then demolding is enabled, but compatibility issues arise between release agent and composition
Solution Approach 1:
The invention merges the release functionality with the coating composition into a single compatible system. By formulating the release properties within the coating composition itself, compatibility issues between separate substances are eliminated, ensuring reliable adhesion and performance.
4Reliability
If coating is applied after production, then enhanced protection is achieved, but process time and complexity increase
Solution Approach 1:
The invention merges the coating application with the production process itself. The coating composition is applied and cured during the same operational cycle as component production, eliminating the need for separate post-production coating steps and reducing overall process time.
Solution Approach 2:
The coating is applied preliminarily during the production process rather than afterward. The coating composition is applied to the component while it is still in the mold, and both the coating and component are cured together, completing the protective coating before the component leaves the production line.
5Productivity
If in-mold coating is used, then coating is integrated during production, but operating times in highly indexed processes are too long
Solution Approach 1:
The invention changes the curing parameters of the coating composition to enable extremely rapid curing at lower temperatures. This allows the coating to cure in just a few seconds during the indexed rotary table process, matching the short cycle times required for high productivity without requiring separate post-production curing steps.
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
The process achieves high-indexed, short operating times with damage-free demolding, regular surfaces, and enhanced mechanical and environmental resistance of coated components, allowing for complex geometries without defects and reducing post-treatment needs.
Implementation Method 1
flashings of the release agent composition
Implementation Method 2
crosslinkings of the release agent composition and/or of the composition for forming the component
Implementation Method 3
injection of a composition for forming the component and/or its subsequent crosslinking
Data Source
AI summary
Described herein is an automatic or automated process for injection molding of coated components, more particularly coated soles of plastic, where first of all the molding tool is lined with a release agent composition and, after flashing of this release agent composition, a composition for forming the component is injected. After crosslinking of these two compositions, the coated component produced is removed from the molding tool and subjected optionally to an aftertreatment.