Shrink Film Ink Coating Segmentation for Crack Prevention
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Solution Overview
Problem
Existing shrink films coated with radiation-curable ink suffer from cracking when shrunk due to the film's contraction, which is exacerbated by the high curability and thickness of the ink, making low-cost, high-quality printing challenging.
Innovation Solution
A shrink film design with distinct regions: a first region coated with radiation-curable ink jet ink and a second region with either no ink or thinner ink, allowing the second region to preferentially shrink, reducing stress and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiation-curable ink is coated on shrink film to improve image quality and curability, then image quality and curability are improved, but the coating cracks when the film shrinks
Solution Approach 1:
The shrink film is divided into a first region with radiation-curable ink coating and a second region without coating or with thinner coating. This segmentation allows the second region to shrink preferentially, reducing stress on the ink-coated first region and preventing cracking while maintaining high curability where needed.
Solution Approach 2:
Different regions of the shrink film are given different ink coating thicknesses: the first region has full coating for high-quality imaging, while the second region has reduced or no coating to facilitate shrinkage. This local differentiation resolves the contradiction between maintaining coating integrity for image quality and allowing sufficient shrinkage.
2Manufacturing precision
If uniform thick coating of radiation-curable ink is applied across the entire film, then image quality is improved, but cracking occurs during shrinkage
Solution Approach 1:
The ink coating thickness is varied locally across the film: the first region receives full coating for high-quality imaging, while the second region has reduced or no coating. This local quality differentiation allows high image quality where needed while preventing cracking in regions prone to stress during shrinkage.
3Quantity of substance
If the entire film is coated with thick ink to ensure complete coverage, then coverage is improved, but the film cannot shrink uniformly causing distortion
Solution Approach 1:
The film is segmented into a first region with full ink coverage and a second region with reduced or no coverage. This segmentation allows the second region to shrink uniformly without the constraint of thick ink coating, maintaining film uniformity while ensuring complete coverage in the first region where imaging is required.
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 design minimizes cracking and distortion of the ink coating by allowing the second region to shrink preferentially, maintaining image integrity and reducing the need for image editing post-shrinkage.
Implementation Method 1
a shrink film that is shrunk in a first direction by heat
Implementation Method 2
the second region to shrink preferentially, reducing stress and cracking
Implementation Method 3
a coating of a radiation-curable ink jet ink formed therein
Data Source
AI summary
A shrink film is shrunk in a first direction by heat and has a quadrilateral shape in plan view with a first and a second side extending in the first direction. The shrink film includes, in plan view, a first region that is defined by a contour including a portion of the first side and a portion of the second side and has a coating of a radiation-curable ink jet ink formed therein, and a second region that has a rectangular shape with two opposing sides defined by a portion of the first side and a portion of the second side and has no coating of the radiation-curable ink jet ink or a coating of the radiation-curable ink jet ink formed therein with a smaller thickness than the coating in the first region.