Thermoplastic Composite Molding with Patterned Vacuum Platform
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Solution Overview
Problem
Existing methods for forming thermoplastic composites do not achieve effective adhesion and penetration of thermoplastic film into cloth material, particularly for creating three-dimensional patterns in products like shoes, purses, and hats, due to lack of uniform pressure and air insulation.
Innovation Solution
A method involving a press mold and/or air insulation film as a pressing member, where a thermoplastic film with a higher surface layer melting point than adhesive layer is heated and vacuum-drawn through channels on a platform with concave and convex patterns, allowing the adhesive layer to penetrate into the cloth material, forming three-dimensional patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rolling methods are used to form thermoplastic composites, then the process is simple, but the three-dimensional patterns are not obvious and adhesion is insufficient
Solution Approach 1:
The mold is segmented into multiple components including upper and lower molds with distinct concave and convex patterns, allowing independent design and optimization of each pattern surface. The heating system is also segmented with multiple heating units that can be independently controlled to apply heat uniformly across different regions of the thermoplastic film
Solution Approach 2:
The invention merges multiple functions into a single molding system: heating units are integrated with the mold structure, vacuum channels are built into the mold cavities, and pressing mechanisms are combined with the mold assembly. This integration achieves uniform pressure distribution, effective adhesion, and clear three-dimensional pattern formation simultaneously
2Manufacturing precision
If hot pressing with conventional molds is used, then pressure can be applied, but the concave and convex patterns are not three-dimensional obviously and adhesion is poor
Solution Approach 1:
The mold surfaces feature localized concave and convex patterns with specific geometries designed to create pronounced three-dimensional effects on the thermoplastic film. The heating units are positioned to apply heat locally to specific regions, and the vacuum channels are distributed to create localized suction forces that enhance pattern formation in different areas
Solution Approach 2:
The thermoplastic film itself serves as an intermediary material that transfers the concave and convex patterns from the mold surfaces to the final composite structure. The adhesive layer within the thermoplastic film acts as a mediator that bonds the cloth material to the patterned surface, enabling clear three-dimensional pattern reproduction
3Strength
If vacuum alone is used for adhesion, then the process is simple, but uniform pressure is not achieved and penetration into cloth material is insufficient
Solution Approach 1:
The invention replaces simple vacuum suction with a combined heating-pressing-vacuum system. The heating units soften the thermoplastic film to increase its flow and adhesion properties, while the pressing mechanism applies uniform mechanical pressure to force the softened material into the cloth substrate, creating strong penetration and bonding
Solution Approach 2:
The system dynamically changes multiple parameters during the molding process: temperature is increased to soften the thermoplastic film, pressure is applied uniformly through the pressing mechanism, and vacuum level is controlled to maintain proper adhesion. These parameter changes work synergistically to achieve strong penetration and bonding without requiring overly complex equipment
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 method ensures better adhesion and penetration of the thermoplastic film into the cloth material, enabling the creation of thermoplastic composites with varying shapes for specific products like shoes, purses, and hats, with improved uniformity and pattern formation.
Implementation Method 1
heating the thermoplastic film by using a heating unit so as to melt the adhesive layer and to soften the surface layer
Implementation Method 2
melt the adhesive layer
Implementation Method 3
air in the plurality of channels is drawn by a vacuum unit
Implementation Method 4
the plural pores draws the thermoplastic film and the cloth material downwardly
Implementation Method 5
a top surface of the cloth layer is pressed by a pressing member, the pressing member presses the cloth material
Implementation Method 6
provided by a force uniformly applied thereto by the pressing member
Implementation Method 7
the adhesive layer adheres with the cloth material
Data Source
AI summary
A method for forming thermoplastic composites comprising: (a). cutting a thermoplastic film (10) and a cloth material (20), wherein the thermoplastic film (10) is comprised of a surface layer (11) and an adhesive layer (12), and a melting point of the surface layer (11) is higher than the adhesive layer (12); (b). placing the thermoplastic film (10) on a platform (30) of a molding machine, facing the adhesive layer (12) upwardly, and covering the cloth material (20) on the thermoplastic film (10), wherein the platform (30) includes a plurality of channels (31) defined therein, a plurality of concave and convex patterns (32) arranged on a top surface thereof, and plural pores (33) evenly formed on the top surface thereof and communicating with the plurality of channels (31); (c). heating the thermoplastic film (10) by using a heating unit (40) so as to melt the adhesive layer (12) and to soften the surface layer (11).