Thermal Transfer Printing With Reusable Particle-Coated Transfer Members
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Solution Overview
Problem
Thermal transfer printers using single-use ribbons are wasteful and costly due to the inefficiency of ink utilization, as much of the ribbon's ink surface is not transferred to the printing substrate.
Innovation Solution
A printing system with a transfer member that employs a movable transfer member with a transparent rear side and an EM radiation-absorbing elastomeric silicone layer on the front side, allowing EM radiation to be applied through the rear side to render thermoplastic particles tacky, which are then transferred to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-use ribbon is used in thermal transfer printing, then high quality printing is achieved, but material waste increases and operating cost increases
Solution Approach 1:
The patent replaces the expensive single-use ribbon with a reusable transfer member that has a replenishable particle coating. The transfer member itself is durable and can be used repeatedly, while only the thermoplastic particles are consumed and replenished, significantly reducing material waste compared to disposable ribbons.
Solution Approach 2:
The patent enables recovery and reuse of the transfer member after each printing cycle. The thermoplastic particles are replenished onto the transfer member surface, allowing the same transfer member to be used for multiple printing cycles, thus recovering the expensive component and discarding only the consumable particles.
2Manufacturing precision
If a single-use ribbon is used in thermal transfer printing, then high quality printing is achieved, but operating cost increases
Solution Approach 1:
The patent replaces the expensive single-use ribbon with a reusable transfer member that has a replenishable particle coating. The transfer member itself is durable and can be used repeatedly, while only the thermoplastic particles are consumed and replenished, significantly reducing material waste compared to disposable ribbons.
Solution Approach 2:
The system includes an automated particle replenishment mechanism that applies fresh thermoplastic particles to the transfer member after each printing cycle, enabling continuous operation without manual intervention and reducing operating costs.
3Productivity
If EM radiation is applied through the rear side of the transfer member, then particle transfer efficiency is improved, but the transfer member structure becomes more complex
Solution Approach 1:
The patent introduces an EM radiation-absorbing elastomeric silicone layer as an intermediary between the EM radiation source and the thermoplastic particles. This layer absorbs the EM radiation and converts it to heat, which then transfers to the particles, enabling efficient heating and transfer while protecting the particles from direct EM radiation exposure.
Solution Approach 2:
The transfer member employs a composite structure consisting of a transparent support layer and an EM radiation-absorbing elastomeric silicone layer. This composite design allows the support layer to provide mechanical strength while the elastomeric layer provides EM radiation absorption and heat transfer functionality.
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
Enables continuous printing by replenishing the transfer member's particle coating after each cycle, reducing waste and improving efficiency by ensuring targeted and complete transfer of the thermoplastic particles to the substrate.
Implementation Method 1
an EM radiation-absorbing elastomeric silicone layer on the front side, allowing EM radiation to be applied through the rear side
Implementation Method 2
applying radiation to selected regions of the coated imaging surface to heat and render tacky the particles within the selected regions
Implementation Method 3
heat and render tacky the particles within the selected regions
Implementation Method 4
pressing at least a portion of the coated imaging surface and at least a corresponding portion of the substrate surface against one another, to cause transfer to the surface of the substrate of only the regions of the particle coating that have been rendered tacky
Data Source
AI summary
A printing assembly for thermal transfer printing is disclosed. The assembly comprises at least one first printing system comprising a transfer member having an imaging surface on the front side, a coating station at which a monolayer of thermoplastic particles is applied to the imaging surface, an imaging station at which electromagnetic radiation (EM) is applied, optionally via the rear side of the transfer member, to selected regions of the imaging surface to render the particles coating the selected regions tacky, a transfer station at which only the regions of the particles coating that have been rendered tacky are transferred to a substrate to form an adhesive image; and at least one more downstream printing system. The transfer member includes on its front side an EM radiation absorbing layer, the imaging surface being formed on, or as part of, the absorbing layer, and on its rear side a body which can optionally be transparent to EM radiation.