Powder Slush Molding Machine Resin Coating Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional powder slush molding methods fail to produce durable 2-color molded sheet-like articles with clear borders and adequate durability due to poor adhesion between resin layers and thermal conductivity issues, leading to instability and breakage.
Innovation Solution
A powder slush molding apparatus equipped with a resin coating device for forming a thin coating layer of the first resin on a mold, followed by powder slush molding with a second resin, minimizing thermal conductivity differences and ensuring accurate adhesion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder slush molding method is used to mold multiple resins, then the molding process can be completed, but the borders between multiple slush molded articles are not clear and the mold temperature changes, resulting in poor adhesion and weak borders
Solution Approach 1:
The patent applies preliminary action by pre-heating the mold to a specific temperature range (50-150°C) before applying the first resin, and then controlling the cooling process after the second resin is applied. This temperature control sequence ensures clear borders and strong adhesion between multiple resin layers by preventing premature mixing while maintaining structural integrity.
Solution Approach 2:
The patent changes the temperature parameter dynamically during the molding process - heating the mold to 50-150°C before first resin application, then allowing controlled cooling during second resin application. This parameter change enables precise control over resin flow, border definition, and interlayer adhesion strength.
2Manufacturing precision
If a coating device is used to coat resin at a predetermined point after powder slush molding, then a 2-color molded sheet-like article can be formed, but the adhesion strength between powder slush molded material and coated layer is poor and they tend to detach
Solution Approach 1:
The patent applies preliminary action by forming the first resin layer at a predetermined position before applying the second resin layer. The first resin is applied to a pre-heated mold surface, allowed to partially set, and then the second resin is applied adjacent to or on top of it. This sequence ensures strong adhesion between layers while maintaining positioning accuracy.
Solution Approach 2:
The patent controls the temperature parameter at 50-150°C during the resin application process, which optimizes the adhesion between different resin layers. This temperature control prevents premature complete setting of the first resin, allowing the second resin to bond strongly with it while maintaining the desired 2-color appearance.
3Quantity of substance
If a thick coating layer is formed on the mold, then the first resin can be applied, but the difference in thermal conductivity between formed and unformed places becomes large, causing instability in powder slush molding
Solution Approach 1:
The patent changes the thickness parameter of the first resin coating layer to a specific range (1-200 μm) and controls the mold temperature to 50-150°C. This parameter optimization ensures sufficient resin coverage while maintaining thermal conductivity uniformity across the mold surface, preventing instability during the subsequent powder slush molding process.
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 enables the stable and quick production of durable 2-color molded sheet-like articles with improved adhesion and reduced thickness variation, enhancing their mechanical strength and suitability for automotive interior components.
Implementation Method 1
a resin coating device for forming a thin coating layer of the first resin on a mold
Implementation Method 2
powder slush molding with a second resin, minimizing thermal conductivity differences and ensuring accurate adhesion between layers
Implementation Method 3
improved adhesion and reduced thickness variation, enhancing their mechanical strength
Data Source
Figure 1
Figure 2
Figure 3~4B
AI summary
To provide a powder slush molding apparatus and a powder slush molding method that could quickly and stably produce a 2-color molded sheet-like article with high-durability and the like. The present invention is directed to a powder slush molding apparatus provided with a powder slush part (Part A), a mold heating part (Part B), a mold cooling part (Part C), and a coating/demolding part (Part E) for manufacturing the 2-color molded sheet-like article and the powder slush molding method thereof. After a 1-200 µm thick coating layer consisting of a first resin is coated by a resin coating device in the coating/demolding part, a sheet-like article consisting of a second resin which is different from the first resin is molded on or adjacent to the coating layer consisting of the first resin in the powder slush part.