UV Ink Layer Printing for Flat, Durable Fabric Surfaces
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Solution Overview
Problem
Existing methods for printing UV-curable layers on substrates like fabric for apparel and footwear face challenges in achieving a flat surface, especially on uneven substrates, and ensuring proper curing and adhesion, leading to inconsistent layer quality and potential delamination due to differential thermal expansion.
Innovation Solution
A process involving a printer that applies UV-curable inks in multiple layers, with each layer being partially cured to flatten the surface and then fully cured, allowing subsequent layers to adhere properly, and incorporating patterns with openings to accommodate thermal expansion, ensuring a flat and durable finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If UV-curable inks are printed in multiple layers on uneven substrates, then the surface flatness is improved, but the curing completeness and adhesion quality deteriorate
Solution Approach 1:
The printing process is segmented into multiple passes, with each pass depositing a thin layer of UV-curable ink. This segmentation allows each layer to be properly cured and adhered before the next layer is applied, resolving the contradiction between achieving surface flatness through multiple layers and maintaining curing completeness and adhesion quality.
Solution Approach 2:
Each layer is preliminarily cured with a low-power UV light source before the next layer is applied. This preliminary curing action ensures that each layer achieves sufficient adhesion and structural integrity before additional layers are deposited, preventing delamination while building up surface flatness.
2Shape
If multiple layers of UV-curable ink are applied to achieve a flat surface, then the surface quality is improved, but the processing time increases
Solution Approach 1:
The system merges the printing and curing operations into a more integrated process. By using a low-power UV light source that can cure each layer quickly in situ, the processing time for each layer is reduced, offsetting the time increase from multiple layers and achieving surface flatness without excessive processing time.
3Speed
If layers are fully cured immediately after printing, then the curing speed is improved, but the adhesion between layers deteriorates
Solution Approach 1:
Instead of fully curing each layer immediately, the system applies partial curing with a low-power UV light source. This partial curing action provides sufficient adhesion between layers while maintaining the ability to achieve complete curing eventually, resolving the contradiction between curing speed and interlayer adhesion strength.
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 process results in a consistently flat and durable surface with improved adhesion and resistance to thermal expansion, enhancing the quality and longevity of printed layers on substrates like fabric for apparel and footwear.
Implementation Method 1
The first layer is then partially cured by subjecting the first layer to a first predetermined radiation event... The second layer and the first layer are then fully cured by subjecting the second layer to a second predetermined radiation event
Data Source
AI summary
A process for printing multiple layers on a fabric or other material using UV-curable ink that includes a step of printing a first layer on the material and another step of partially curing the first layer. A next step includes printing a partially UV-transparent layer over the first layer and fully curing the UV-transparent layer while simultaneously fully curing the first layer.