Conductive Polyurethane Belt Coating With Perforated Film Paths
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Solution Overview
Problem
Existing drive belts, particularly those made of polyurethane, face challenges in achieving effective antistatic properties without compromising mechanical properties, especially when produced using the casting process, as conventional conductive coatings have low electrical conductivity and deteriorate mechanically due to additives.
Innovation Solution
The belt features a film layer with perforations that are partially filled with electrically conductive polyurethane, allowing for enhanced electrical conductivity across the belt's cross-section without affecting mechanical properties, and includes an insulating fabric layer to reduce manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically conductive coating is applied to achieve antistatic properties, then electrical conductivity is improved, but mechanical properties deteriorate due to additives
Solution Approach 1:
The film layer is designed with perforations (through-openings) that allow the electrically conductive polyurethane from the belt body to penetrate through and form conductive pathways. This porous structure enables antistatic functionality without requiring conductive additives in the film material itself, thus preserving mechanical properties.
Solution Approach 2:
The belt combines multiple materials with complementary properties: an electrically conductive polyurethane belt body (providing conductivity), a fabric layer (providing mechanical strength and structure), and a film layer with perforations (providing protection while allowing conductivity). The composite structure allows each layer to fulfill its specific function without compromising others.
2Device complexity
If a thin film layer is used for coating, then manufacturing complexity is reduced, but electrical conductivity is insufficient and mechanical properties deteriorate
Solution Approach 1:
The film layer incorporates perforations that create conductive pathways through the coating structure. This allows the thin film to maintain electrical conductivity by enabling direct contact between the conductive polyurethane belt body and the outer surface, without requiring thick layers or conductive additives.
Solution Approach 2:
The perforated film layer acts as an intermediary structure that mediates between the conductive belt body and the external environment. It allows electrical charge to pass through while maintaining the protective coating function, solving the contradiction between thin film simplicity and sufficient conductivity.
3Ease of manufacture
If the film layer wears out quickly, then manufacturing costs are reduced, but antistatic properties are lost
Solution Approach 1:
The perforated film structure allows the conductive polyurethane to extend through the film layer, creating redundant conductive pathways. When the film wears, the underlying conductive polyurethane and fabric layer continue to provide antistatic protection, extending service life without increasing manufacturing complexity.
Solution Approach 2:
The design anticipates film wear by building in redundant conductivity pathways through the perforated structure and conductive belt body. This 'cushions' against the loss of antistatic properties when the film deteriorates, ensuring long-term reliability without requiring expensive replacement strategies.
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 design achieves improved antistatic performance by ensuring electrostatic charge dissipation through the belt, maintaining mechanical integrity and durability, and reducing contact resistance between conductive components, while being suitable for both push-through and casting processes.
Implementation Method 1
an electrically conductive connection must be present between the belt and at least one grounded pulley or back roller
Implementation Method 2
the film layer has at least one perforation in some places, wherein the perforation is at least partially filled with the polyurethane
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a belt with a belt body, wherein the belt body comprises an electrically conductive polyurethane, preferably made of polyurethane. A plurality of tensile members are arranged longitudinally within the belt body and enclosed by the polymeric material of the belt body. The belt has a coating on one drive side that forms a strong adhesive bond with the belt body. The coating comprises a film layer and a fabric layer arranged between the belt body and the film layer. According to the invention, the film layer has at least partial perforation, wherein the perforation is at least partially filled by the polymeric material.