Membrane Mould Coating for Complex Preformed Substrates
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Solution Overview
Problem
Existing coating processes for preformed substrates face challenges in applying uniform compression force, particularly at portions with complex geometries, such as undercuts and vertical walls, leading to potential damage, non-uniform thickness, and increased cycle times due to varying material thickness and seams.
Innovation Solution
A process using an elastically deformable membrane within a mould to apply uniform compression force perpendicular to the substrate, avoiding direct contact during closure, and accommodating thickness variations through membrane elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid metal half-moulds are used to compress the semi-finished product with uniform pressure, then manufacturing precision is improved, but device complexity increases and adaptability to complex geometries deteriorates
Solution Approach 1:
The patent employs an elastically deformable membrane as the conformation surface of the first half-mould. This membrane can flex and adapt to complex substrate geometries including undercuts and vertical walls, while still providing uniform compression force when pressurized. The membrane's elasticity allows it to conform to any substrate shape without requiring complex rigid mould structures, thus resolving the contradiction between manufacturing precision and adaptability to complex geometries.
Solution Approach 2:
The patent changes the physical state and properties of the mould material from rigid metal to elastically deformable membrane. By controlling the pressure applied to the membrane, the system can adapt its conformation to match complex substrate geometries while maintaining uniform compression. This parameter change allows the mould to be both simple in structure and highly adaptable to various geometries.
2Productivity
If vertical closure of the mould is used to compress the semi-finished product, then productivity is improved, but object-affected harmful factors increase due to sliding and damage risk
Solution Approach 1:
The elastically deformable membrane prevents direct contact and sliding between the rigid mould and the semi-finished product during vertical closure. The membrane acts as a protective interface that deforms elastically to accommodate the substrate geometry without causing mechanical damage to the coating layer, thus enabling fast vertical closure while eliminating harmful sliding effects.
Solution Approach 2:
The membrane serves as an intermediary element between the rigid mould structure and the delicate semi-finished product. During mould closure, the membrane transmits the compression force while protecting the coating layer from direct contact with rigid surfaces, preventing sliding, tearing, and stretching damages that would otherwise occur during rapid vertical closure.
3Device complexity
If rigid metal half-moulds are used for compression, then device complexity is reduced, but manufacturing precision deteriorates due to pressure concentrations from thickness variations
Solution Approach 1:
The elastically deformable membrane distributes compression pressure uniformly across the entire surface of the semi-finished product, regardless of local thickness variations in the coating layer. The membrane's flexibility allows it to conform to thickness variations without creating pressure concentrations, maintaining coating uniformity while keeping the mould structure simple and easy to manufacture.
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 ensures uniform coating application without damage, reduces cycle time, and maintains aesthetic quality by adapting to complex geometries and material variations without requiring multiple process adjustments.
Implementation Method 1
an elastically deformable membrane which at least partially forms the conformation surface of the first half-mould
Implementation Method 2
pressurizing said fluid to arrange said membrane in a second configuration in which it is elastically expanded towards said second half-mould for compressing said semi-finished product between said membrane and said second half-mould
Implementation Method 3
maintaining said membrane in said second configuration, heating said semi-finished product for firmly fixing said preformed substrate and said coating layer to each other
Data Source
AI summary
Process for coating a preformed substrate (1), comprising providing a semi-finished product (2) comprising the preformed substrate (1) and a coating layer (3), providing a mould (4) comprising a first (5) and a second half-mould (6), the first half-mould (5) comprising an elastically deformable membrane (8) which at least partially forms a respective conformation surface (7), arranging the semi-finished product (2) on the second half-mould (6), putting under depression a fluid (11) acting on the membrane (8) to maintain the membrane (8) adherent to a main body (50) of the first half-mould, closing the mould (4) maintaining a free distance between the conformation surface (7) of the first half-mould (5) and the semi-finished product (2), pressurizing the fluid (11) to expand the membrane (8) towards the second half-mould (6) for compressing the semi-finished product, maintaining the membrane (8) in the second configuration, heating the semi¬finished product (2) for firmly fixing the preformed substrate (1) and the coating layer (3) to each other.