Composite Membrane Bonding Structure for Membrane Pumps
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Solution Overview
Problem
Existing composite membranes for membrane pumps face issues with insufficient bonding between the elastomeric body and the insert, particularly with thermoplastic elastomers, leading to detachment under high surface forces and allowing compressed air entry, which is exacerbated by complex and costly manufacturing processes.
Innovation Solution
A composite membrane design featuring a thin composite layer with microscopic hook-shaped anchor elements formed through surface treatment, such as wet chemical etching, to create a strong bond between the elastomeric body and the insert, preventing detachment and air ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an additional adhesive layer is used to bond the elastomeric body to the insert, then bonding strength is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The insert surface is pre-treated with an etching solution before the elastomeric body is applied, creating a roughened surface structure that enhances mechanical interlocking. This preliminary surface modification eliminates the need for additional adhesive layers while ensuring strong bonding between the elastomeric body and insert.
2Ease of manufacture
If the elastomeric body is made of thermoplastic elastomer to simplify manufacturing, then ease of manufacture is improved, but bonding reliability deteriorates due to insufficient adhesion to metal inserts
Solution Approach 1:
The surface parameters of the metal insert are changed through chemical etching, transforming the smooth surface into a roughened structure with increased surface area and mechanical interlocking features. This parameter change enables reliable bonding of thermoplastic elastomers to metal inserts without requiring additional adhesive systems or complex manufacturing processes.
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 solution provides a stable, cost-effective bond that withstands dynamic loads and reduces air ingress, extending the membrane's service life and simplifying manufacturing.
Implementation Method 1
the surface is roughened by treatment with electromagnetic radiation, thereby enlarging the surface and resulting in better adhesion
Implementation Method 2
The elastomeric body usually has a polytetrafluoroethylene (PTFE) coating on the media side to ensure chemical resistance to the conveyed media
Data Source
AI summary
A composite membrane for a membrane pump has an elastomeric body with an outer edge forming a clamping surface, a base forming a chamber, and a flexible membrane section connecting the outer edge to the base. An insert is at least partially in the chamber. A composite layer connects the insert to the body, has a thickness less than 100 μm, and is formed with a plurality of hook-shaped anchor elements engaging into the body.