Porous Graphite Sliding Elements for Low-Lubricant Transport Chains
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Solution Overview
Problem
Conventional sliding elements in stretching systems and transport chains require significant amounts of lubricant, leading to increased lubricant consumption and potential contamination of the plastic film being stretched.
Innovation Solution
The development of graphite sliding elements with specific particle size distributions and impregnation with inorganic salts, such as aluminum phosphate, which have open pores to absorb and retain lubricants, reducing the need for external lubrication and enhancing mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional sliding elements are used in stretching systems and transport chains, then the system can operate with standard lubrication, but lubricant consumption increases and plastic film contamination occurs
Solution Approach 1:
The sliding element incorporates a porous PTFE layer with controlled pore structure that absorbs and retains lubricant within its matrix. This porous structure allows the material to self-lubricate by releasing lubricant at the contact interface, significantly reducing lubricant consumption and preventing film contamination while maintaining low friction and wear resistance
Solution Approach 2:
The sliding element is constructed as a composite material system combining PTFE (polytetrafluoroethylene) with reinforcing fillers and lubricant additives. This composite structure integrates the low-friction properties of PTFE with the lubricant-retention capabilities of the porous matrix, achieving both reduced lubricant consumption and contamination prevention
2Strength
If graphite sliding elements with specific particle size distributions are used, then mechanical properties and flexibility are improved, but manufacturing complexity increases
Solution Approach 1:
The invention specifies optimized particle size distributions for graphite fillers (D10, D50, D90 parameters) and PTFE matrix characteristics that maximize mechanical strength and flexibility. By controlling these parameters within defined ranges, the patent achieves superior mechanical properties while maintaining manufacturability through standardized processing procedures
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 solution significantly reduces lubricant consumption, minimizes film contamination, and allows for higher operating temperatures, while maintaining mechanical integrity and flexibility across different chain systems.
Implementation Method 1
The porous structure of the sliding element absorbs and retains lubricants
Implementation Method 2
significantly reduces lubricant consumption, minimizes film contamination, and allows for higher operating temperatures
Data Source
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AI summary
The invention relates to a sliding element, in particular for a stretching installation and/or a conveyor chain, comprising graphite or electrographite, wherein the sliding element has pores which have an open pore size of ≥ 7.5 % by volume, and wherein the particle size of the graphite particles used as a starting material for the sliding elements is between 3 µm and 15 µm.