Transfer Varnish Foil Curing for Flexible Anti-Fingerprint Finishes
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Solution Overview
Problem
Existing methods for transferring varnish onto substrates using PET foils face issues with lacquer stiffness and shrinkage during curing, leading to handling difficulties and potential defects due to flaking.
Innovation Solution
A method involving partial radiation curing of a foil with radiation-curable resins and thermal polymerization initiators, followed by calendering under pressure and temperature to improve flexibility and prevent detachment during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high lacquer thicknesses are applied to achieve the required surface roughness for anti-fingerprint effect, then the desired surface finish is obtained, but the lacquer becomes stiff and shrinks during curing, causing handling difficulties and potential flaking
Solution Approach 1:
The patent applies partial radiation curing to change the physical state of the lacquer from fully cured (stiff) to partially cured (flexible). This parameter change in the curing degree allows the lacquer to maintain flexibility and flatness during handling while still achieving the required surface roughness for anti-fingerprint effect
Solution Approach 2:
Instead of applying full curing radiation dose, the patent uses partial radiation curing to achieve only a portion of the complete curing process. This partial action maintains the lacquer's flexibility and prevents shrinkage-related defects while still providing sufficient surface finish quality
2Reliability
If the lacquer is fully cured to ensure durability and adhesion, then the coating becomes stiff and shrinks, but if left uncured it lacks durability and may detach during handling
Solution Approach 1:
The patent applies partial radiation curing to achieve a balance between adhesion and flexibility. The partial curing provides sufficient adhesion and durability while preventing excessive stiffening and shrinkage that would cause handling problems
Solution Approach 2:
By controlling the radiation dose to achieve partial rather than complete curing, the patent changes the physical parameters of the lacquer to maintain an optimal balance between adhesion strength and flexibility for handling
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
Enhances foil flatness and handling, reducing waste by ensuring the varnish layer remains flexible and adheres well, facilitating industrial processes.
Implementation Method 1
curing the resin by means of the thermal polymerisation initiator provided in the second stage together with the resin
Implementation Method 2
at least one resin contains radiation curable functional groups and a thermal polymerisation initiator, a third stage of partial radiation curing of the foil resulting from the previous stage
Data Source
AI summary
A method of manufacturing a transfer varnish transfer foil comprising: (A) a first stage of providing a foil giving a surface finish on which to apply a layer of transferable varnish, (B) a second stage of applying a layer or layers of a resin or resins on a face with the desired surface finish of the by-product obtained in the previous stage, wherein at least one resin contains radiation curable functional groups and a thermal polymerisation initiator, (C) a third stage of partial radiation curing of the foil resulting from the previous stage, and (D) a fourth stage of calendering or pressing the foil resulting from the previous stage by applying pressure and temperature, to generate a given surface finish, while curing the resin using the thermal polymerisation initiator provided in the second stage together with the resin.