Thermoplastic Screen Printing Paste Low-Temperature Solidification
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Solution Overview
Problem
Existing thermoplastic screen printing methods require high temperatures for hardening and often use substances like bisphenol A, which are environmentally unfriendly and costly, and do not allow for quick application of subsequent inks.
Innovation Solution
A thermoplastic screen printing paste composed of hydroxyfunctional polyesters, blocked polyisocyanates, pigments, and additives, with a melting range below 90°C, free of bisphenol-A and reactive diluents, allowing for rapid solidification on substrates and subsequent ink application without the need for extensive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperatures are used for hardening the coating composition, then the hardening process is effective, but energy consumption increases and environmental friendliness decreases
Solution Approach 1:
The patent changes the temperature parameter from high (170-240°C) to low (below 90°C melting range) by using a thermoplastic binder system that solidifies through cooling rather than chemical cross-linking, thereby reducing energy consumption while maintaining hardening effectiveness
Solution Approach 2:
The patent utilizes phase transition (melting and solidification) of the thermoplastic binder as the hardening mechanism. The coating is applied in molten state and hardens when cooled below the melting range, eliminating the need for high-temperature curing and reducing energy consumption
2Reliability
If high temperatures are used for hardening, then the coating hardens effectively, but the screen life is reduced
Solution Approach 1:
By using phase transition (cooling-induced solidification) instead of high-temperature curing, the patent reduces thermal stress and degradation of the screen mesh, thereby extending screen life while maintaining effective hardening of the coating
Solution Approach 2:
The patent converts the typically harmful high-temperature curing process into a beneficial low-temperature solidification process, which protects the screen from thermal damage while achieving effective coating hardening
3Reliability
If the coating composition contains substances like bisphenol A, then the hardening process is effective, but environmental friendliness and safety decrease
Solution Approach 1:
The patent extracts and eliminates harmful substances like bisphenol A from the coating composition by using a thermoplastic binder system that hardens through physical solidification rather than chemical cross-linking, thereby improving environmental friendliness while maintaining hardening effectiveness
Solution Approach 2:
The patent replaces expensive and harmful cross-linking agents with a simpler thermoplastic binder system that achieves hardening through physical state change, eliminating the need for problematic chemicals like bisphenol A
4Productivity
If the coating composition hardens quickly after application, then subsequent ink application is enabled, but the hardening temperature must be low
Solution Approach 1:
The patent uses phase transition (rapid cooling-induced solidification) as the hardening mechanism, allowing the coating to solidify quickly at low temperatures after application, enabling fast successive ink application without requiring high-temperature curing
Solution Approach 2:
Instead of heating to harden the coating (conventional approach), the patent inverts the process by cooling to solidify the thermoplastic binder, enabling quick hardening at low temperatures and facilitating rapid production cycles
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 enables an environmentally friendly, economical, and quick hardening process that allows for successive ink application, reducing energy consumption and extending screen life, while providing desirable coloration and mechanical properties.
Implementation Method 1
the melting or softening range of the thermoplastic screen printing paste lies at temperatures below 90° C.
Implementation Method 2
one or more hydroxyfunctional polyesters, one or more blocked polyisocyanates
Data Source
AI summary
The present invention relates to a thermoplastic screen printing paste comprisingone or more hydroxyfunction polyesters,one or more blocked polyisocyanates,pigments, andadditives.The invention is characterized in that the melting or softening range of the thermoplastic screen printing paste lies at temperatures below 90° C. and the paste is free of bisphenol-A is and free of other substances directly involved in the polymerization itself.