Heat Transfer Coating Static Dissipation
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Solution Overview
Problem
Heat transfer papers face issues with stray toner ink adhering to the image-receptive coating during printing processes, leading to blurred images and unwanted background noise, which are then transferred to substrates, affecting image quality.
Innovation Solution
A heat transfer material is developed with a splittable layer and an image-receptive coating containing thermoplastic polystyrene microparticles, a thermoplastic binder, and a humectant, which minimizes the attraction of stray toner ink by dissipating static charge and melting at transfer temperatures to conform to the substrate, while maintaining durability and color quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image-receptive coating is designed to attract and adhere toner ink at printing temperatures, then the toner ink transfer efficiency is improved, but stray toner ink is also attracted and adheres to the coating, causing image blur and background noise
Solution Approach 1:
The patent modifies the physical and chemical parameters of the image-receptive coating by incorporating thermoplastic polyolefin wax microparticles with specific melting points (90-115°C) and controlled particle sizes (5-80 μm). These parameter changes enable the coating to exhibit temperature-dependent properties: at printing temperatures it attracts toner, but at transfer temperatures it melts to release the image while reducing stray toner adhesion
Solution Approach 2:
The image-receptive coating is formulated as a composite material containing thermoplastic polyolefin wax microparticles, thermoplastic polymeric binders, and other additives. This composite structure combines the toner-attracting properties of the wax microparticles with the binding and structural properties of the polymeric binders, achieving both effective toner transfer and reduced stray toner attraction
2Reliability
If thermoplastic polymeric binders are used in the image-receptive coating to improve transferability, then the image transfer efficiency is improved, but the coating may not effectively dissipate static charge, leading to increased stray toner attraction
Solution Approach 1:
The patent applies local quality by incorporating thermoplastic polyolefin wax microparticles with specific electrical properties into the image-receptive coating. These microparticles are distributed throughout the coating matrix to provide localized static charge dissipation capabilities, allowing different regions of the coating to handle toner attraction and static dissipation functions separately while working together
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 effectively reduces stray toner ink attraction, enhances image quality, and improves wash durability by using thermoplastic polystyrene microparticles that dissipate static charge and melt at transfer temperatures, resulting in superior image transfer and durability on substrates.
Implementation Method 1
the printable surface is specially designed to fuse with the toner ink at the printing temperatures... However, due to this affinity for the toner ink, the printable surface often picks up unwanted, stray toner ink from the printer
Implementation Method 2
The thermoplastic polystyrene microparticles have an average particle size of from about 5 μm (microns) to about 80 μm (microns) and melt at temperatures between about 90°C and about 115°C
Implementation Method 3
The humectant is configured to draw moisture back into the heat transfer sheet after drying
Implementation Method 4
The images are transferred from the heat transfer paper to the substrate through the application of heat and pressure
Data Source
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Figure 3~4
AI summary
Methods of making heat transfer materials are generally provided, along with the materials and the methods of using the materials. A splittable layer can be formed to overlie a base sheet, and an image- receptive coating can be formed to overlie the splittable layer. The image- receptive coating can include thermoplastic microparticles, a thermoplastic binder, and a humectant. The thermoplastic microparticles can be styrene particles having an average particle size of from about 5 microns to about 80 microns and melt at temperatures between about 900C and about 115°C. A second thermoplastic microparticle can also be included in the image- receptive coating. Alternatively, a combination of thermoplastic polyester microparticles and thermoplastic polyamide microparticles can be included in the image- receptive coating. The heat transfer material can then be dried. The humectant is configured to draw moisture back into the heat transfer sheet after drying.