In-Mold Coated Plastic Articles via Automated Compression Molding
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Solution Overview
Problem
Current manufacturing methods for automotive interior parts face challenges such as heavy, aesthetically flawed, and acoustically suboptimal injection molded or vacuum formed parts, along with inefficiencies in post-formation trimming processes, which result in increased costs and labor requirements.
Innovation Solution
An automated compression molding method using an in-mold coating process that integrates a textured, class "A" surface on a composite plastic sheet material, allowing for a single stamping stage to produce high-quality, coated plastic articles with reduced cycle time and labor costs, mimicking painted injection molded articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection molded or vacuum formed parts are used, then production efficiency is improved, but the parts become heavy and aesthetically flawed
Solution Approach 1:
The patent combines the molding process with the coating application into a single integrated operation. The coating is applied directly to the molded part while it is still in the mold, eliminating the need for separate painting or coating steps. This merging of processes achieves both high production efficiency and lightweight construction, as the part is formed and coated in one cycle without requiring additional heavy post-processing equipment or materials.
2Shape
If post-paint applications are used, then aesthetic appearance is improved, but production time and labor costs increase
Solution Approach 1:
The coating is applied to the mold surface before the part is molded, rather than applying paint after the part is formed. This preliminary action allows the coating to be transferred to the part during the molding process itself, achieving high aesthetic appearance while eliminating the need for separate painting operations and reducing production time significantly.
3Ease of manufacture
If traditional compression molding is used, then manufacturing simplicity is maintained, but surface finish quality deteriorates
Solution Approach 1:
The patent introduces a coating layer as an intermediary between the mold surface and the final part surface. This coating layer, applied to the mold before molding, transfers to the part and provides the high-quality surface finish. The process remains simple compression molding, but the intermediary coating layer elevates the surface finish quality without complicating the manufacturing process.
4Manufacturing precision
If multi-step coating processes are used, then coating quality is improved, but device complexity and labor requirements increase
Solution Approach 1:
The patent merges the coating application with the molding process into a single integrated operation. The coating is applied to the mold surface and then transferred to the part during compression molding, achieving high coating quality without requiring multiple separate coating steps, complex coating equipment, or additional labor operations.
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 method reduces production time and labor costs while ensuring high-quality, aesthetically appealing, and acoustically superior automotive interior trim components with improved surface finish and durability, eliminating defects common in post-paint applications.
Implementation Method 1
placing a heated blank of moldable plastic sheet material between the upper and lower mold halves
Implementation Method 2
The mold is then closed and pressure is applied to force the materials to fill up the entire cavity
Implementation Method 3
The heat and pressure are maintained until the plastic materials are cured
Data Source
AI summary
An automated manufacturing method and system and in-mold coated plastic article produced thereby are provided. The system includes a compression mold and a plurality of program-controlled manipulators. An automatic sprayer supported on a first manipulator sprays at least a portion of a mold surface with an in-mold coating composition. An end effector supported on a second manipulator picks up a heated blank of moldable plastic sheet material from an oven and places the heated blank between upper and lower mold halves of the mold. An inner portion of the heated blank is forced into an article-defining cavity of the mold and into contact with at least a portion of the in-mold coating composition. The in-mold coating composition and the inner portion of the heated blank cure and bond to one another so as to form the coated plastic article.