Particulate Substrate for Cured Polymeric Skin

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Solution Overview

Problem

Existing methods for producing cured polymeric skin materials, such as those used in building and furniture, face challenges including high pressure requirements, damage to molds, and inefficiencies in material usage and cost.

Innovation Solution

A method involving the use of a particulate substrate to form a cured polymeric skin, where the particulate substrate allows for the displacement of gases and vapors, reducing pressure needs and enabling easier removal of the skin from the substrate, thus improving efficiency and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high pressure is applied to compress SMC in a mould cavity, then the SMC spreads to all parts of the mould and cures properly, but the skin damages the mould during curing and cannot be reused

Engineering Contradiction:

Improvemould reusabilityVSAvoidpressure required for moulding

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent uses a porous substrate material that allows gases and vapors to escape during the curing process. This porous structure reduces the pressure buildup that would otherwise damage the mould, enabling lower pressing pressures (10-100 bar instead of 1000-1200 tonnes per m2) while maintaining proper curing. The substrate acts as a gas-permeable barrier that protects the mould from damage.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The porous substrate serves as an intermediary layer between the SMC and the mould. It mediates the curing process by allowing gas escape while supporting the SMC, thereby preventing direct contact between the expanding cured skin and the mould surface that would cause stretching and damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If SMC is folded to form a block in the mould cavity, then air and gases can be released during moulding, but the process requires very high pressure (1000-1200 tonnes per m2)

Engineering Contradiction:

Improvegas release capabilityVSAvoidpressing pressure

Core Design Contradiction:

Ease of manufactureVSStress or pressure

Solution Approach 1:

The patent replaces the folded SMC block method with a porous substrate that inherently provides gas release pathways. The porous structure allows gases and vapors to escape during pressing without requiring the SMC to be folded into a complex block shape, thereby achieving gas release at much lower pressures.

Inventive Principle:

Principle #31Porous materials

3Adaptability or versatility

If a solid cellular substrate with open-celled structure is used, then gas and vapour can be removed from the pressing region, but only certain materials can be used and the substrate is substantially rigid

Engineering Contradiction:

Improvesubstrate material selectionVSAvoidprocess complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent specifies that the substrate must have a porous structure with appropriate pore size and distribution to allow gas and vapor escape. This porous requirement enables versatile material selection (paper, fabric, foam, particulate) while maintaining the essential function of gas removal, rather than restricting to only rigid open-celled foams.

Inventive Principle:

Principle #31Porous materials

4Strength

If the sheet-form curable material bonds to the substrate during curing, then the composite product is formed, but the skin cannot be removed without machining which damages the surface

Engineering Contradiction:

Improvebond strengthVSAvoidskin surface quality

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The porous substrate creates a controlled bonding interface where the curable material penetrates into the pores during curing. This provides sufficient bond strength for handling and transport, but allows clean separation afterward without requiring machining, thereby preserving skin surface quality.

Inventive Principle:

Principle #31Porous materials

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 reduces the pressure required for skin formation, prevents mold damage, allows for the reuse of particulate material, and eliminates the need for machining the skin off the substrate, resulting in a more efficient and cost-effective process.

Implementation Method 1

the configuration of the substrate is such that gas and/or vapour can be displaced from the pressing region

Methodology Applied

Scientific EffectGas displacement through particulate structure: Porosity

Implementation Method 2

a portion of the sheet-form curable material flows into the particulate substrate

Methodology Applied

Scientific EffectMaterial flow into porous structure: Porosity

Implementation Method 3

at least partially curing the sheet-form curable material to form a skin

Methodology Applied

Scientific EffectCuring reaction: Photopolymerisation

Data Source

PatentUS20250187319A1Method for producing cured polymeric skins

Publication Date: 2025.06.12 ACELL IND LTD

AI summary

This invention relates to the production of cured polymeric skin materials. In particular, the invention relates to methods and substrates for the production of skin materials, for example, for use in building, furniture, and as architectural components for example in roofing materials such as roofing tiles, or for brick wall effect materials.