Two-Layer Release Film for Distortion-Free Profiled Endless Belts

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Solution Overview

Problem

Manufacturing timing belts with a rubberized surface results in difficulty removing them from production machines, leading to potential distortion and uneven operation, which can cause noise and durability issues.

Innovation Solution

A two-layer film comprising a thermoplastic layer for mechanical strength and a polymeric release agent layer for adhesion prevention is applied to the metal mold, allowing the elastomer coating to be pressed into the mold's profile while ensuring easy removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a rubberized surface is applied to the timing belt to reduce friction and wear, then the coefficient of friction between the belt and pulley is reduced, but the adhesion between the belt and the molding tool increases, making removal difficult

Engineering Contradiction:

Improvefriction and wear between belt and pulleyVSAvoidremoval from molding tool

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The release system is segmented into two distinct layers: a polymeric release agent layer in direct contact with the elastomer coating to prevent adhesion, and a thermoplastic layer providing mechanical strength and structural integrity. This segmentation allows each layer to perform its specific function optimally without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The release film is constructed as a composite material combining a polymeric release agent (such as silicone or fluoropolymer) with a thermoplastic polymer. This composite structure integrates the low-friction, non-adhesive properties of the polymeric release agent with the mechanical strength and thermal stability of the thermoplastic layer, resolving the contradiction between ease of removal and structural requirements.

Inventive Principle:

Principle #40Composite materials

2Productivity

If the belt is removed from the mold after vulcanization, then production continues, but the belt becomes distorted due to strong adhesion, resulting in uneven operation and noise

Engineering Contradiction:

Improveproduction continuityVSAvoidbelt shape uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The release agent layer is applied to the molding tool surface before the elastomer coating is applied, establishing a non-adhesive barrier in advance. This preliminary action prevents adhesion from occurring during vulcanization, ensuring the belt can be removed without distortion and maintaining manufacturing precision while enabling continuous production.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If a release agent is applied to the molding tool to facilitate removal, then the belt can be removed, but the release agent must withstand the vulcanization temperature and mechanical stresses without degrading

Engineering Contradiction:

Improveremoval from molding toolVSAvoidrelease agent stability under heat and stress

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The release film's properties are optimized for the specific vulcanization conditions: the thermoplastic layer is selected to maintain dimensional stability and mechanical strength at vulcanization temperatures, while the polymeric release agent layer is chosen for its thermal stability and low adhesion characteristics under these conditions. This parameter optimization ensures the release system remains effective throughout the entire vulcanization and removal process.

Inventive Principle:

Principle #35Parameter changes

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 ensures the elastomer coating adheres to the desired profile without distortion, maintaining product quality and durability by facilitating easy separation from the mold.

Implementation Method 1

a film with at least two layers, consisting of a thermoplastic layer and a polymeric release agent layer

Methodology Applied

Scientific EffectThermal properties of thermoplastic polymers:

Implementation Method 2

the polymeric release agent layer is in contact with the metal mold... provides sufficient release properties during the production of the profiled endless belt

Methodology Applied

Scientific EffectFriction reduction: Friction

Data Source

PatentEP4159424B1Method for producing profiled endless belts using at least two-layer extensible separator films, and composite products produced accordingly

Publication Date: 2025.12.10 CONTITECH DEUTSCHLAND GMBH

Figure 1~2

AI summary

The present invention relates to methods for manufacturing elastomeric articles, and in particular profiled endless belts (1), using at least two-layer stretchable release films (10, 11), in which the two-layer stretchable release film effectively prevents the elastomeric article material from adhering to the molding tool used to form the surface of the elastomeric article. The use of two-layer release films (10, 11) avoids the problems associated with alternative coatings of the molding tool with a release agent. The present invention further relates to composite products made of elastomeric articles and corresponding at least two-layer films that can be manufactured or are manufactured using such a method, as well as the use of such two-layer release films to suppress and/or prevent the adhesion of elastomeric molded parts to the molding tools used for their manufacture.