Transfer Belt Resistivity Uniformity via PPS Nylon Composite
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Solution Overview
Problem
The existing transfer belts for electrophotography exhibit nonuniform conductive properties due to poor dispersion of carbon in polyphenylene sulfide resin, leading to hollow defects and toner scattering, which are exacerbated by the difficulty in achieving compatibility between PPS and polyamide resins.
Innovation Solution
A transfer belt composed of polyphenylene sulfide resin and a conductive agent, with the addition of nylon resin to enhance compatibility and uniform dispersion of the conductive agent, resulting in a surface resistivity deviation of 1 or less, thereby preventing hollow defects and toner scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon is blended in PPS resin for transfer belt manufacturing, then the transfer belt achieves conductive property, but the carbon disperses nonuniformly causing resistivity fluctuation
Solution Approach 1:
The patent introduces a specific resin composition as an intermediary medium between PPS resin and carbon conductive agent. This resin composition, containing PPS resin and at least one of polyamide resin or polyester resin in specific ratios, acts as a mediator that improves carbon dispersion uniformity while maintaining conductive properties, thereby resolving the contradiction between achieving conductivity and ensuring resistivity uniformity
Solution Approach 2:
The patent creates a composite resin composition by combining PPS resin with polyamide resin or polyester resin in specific proportions. This composite material approach allows the benefits of both base resin and additive resin to work synergistically, improving carbon dispersibility while maintaining the overall conductive performance and mechanical properties of the transfer belt
2Stability of the object's composition
If polyamide resin is blended with PPS resin to improve compatibility, then the two components are made compatible at high temperature, but the manufacturing process becomes more complex
Solution Approach 1:
The patent specifies precise compositional parameters (ratios of PPS resin to polyamide/polyester resin within specific ranges) and processing temperature parameters to achieve compatible mixing of the resin components. By controlling these parameters, the patent enables effective resin compatibility without requiring excessively complex manufacturing processes, as the compatibility is achieved through parameter optimization rather than process complexity
Data Source
AI summary
A transfer belt for electrophotography comprisesat least a polyphenylene sulfide resin and a conductive agent, preferably further a nylon resin,wherein a deviation in surface resistivity is 1 or less; and an image-forming apparatus comprises a latent-image supporting member, anda transfer member that supports a toner image transferred thereon from the latent-image supporting member and transfer the supported toner image onto an image-receiving material, comprising at least a polyphenylene sulfide resin and a conductive agent, and having a deviation in surface resistivity of 1 or less.