Patterned Wax Release Layer via Gravure Printing
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Solution Overview
Problem
The use of flood-coated wax carriers in heat transfer labels results in excessive wax usage, increased costs, and quality issues such as pinholes, voids, and particulate matter, leading to inefficient label production and aesthetic issues due to the random wax 'halo' formation around the ink design.
Innovation Solution
A process and apparatus for applying a wax release layer in a patterned form onto a carrier using a gravure sleeve with etched regions, combined with a low-viscosity wax formulation, allowing for localized application and matching the size, shape, and configuration of the ink design, and an apparatus including a gravure sleeve and tray with a steam-heated manifold to soften the wax for precise deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flood-coating is used to apply wax release layer onto carrier, then complete coverage is achieved, but excessive wax usage and cost increase
Solution Approach 1:
The patent applies local quality by transitioning from uniform flood-coating to selective area coating. The gravure sleeve with etched cells deposits wax only in specific patterns matching the ink design requirements, providing localized wax release properties where needed while eliminating waste in non-printing areas.
Solution Approach 2:
The patent segments the continuous flood-coating process into discrete controlled deposition through gravure sleeve cells. Each etched cell acts as an independent unit that can be precisely controlled to deposit wax only where required, dividing the coating function into manageable segments that match the label design.
2Reliability
If flood-coating is used to apply wax release layer onto carrier, then complete coverage is achieved, but quality issues such as pinholes, voids, and particulate matter occur
Solution Approach 1:
The patent introduces the gravure sleeve as an intermediary between the wax source and the carrier. This intermediary component with its precisely engineered etched cells provides controlled wax transfer, eliminating direct flood-coating defects while ensuring consistent, defect-free wax deposition in the required patterns.
Solution Approach 2:
The patent replaces the mechanical flood-coating system with a gravure printing system. This substitution transitions from a broad coverage mechanical process to a precision-controlled deposition system that uses the gravure sleeve's etched cell structure to achieve both coverage and surface quality.
3Reliability
If flood-coated carrier is used, then protective coverage is provided, but random wax halo formation occurs around ink design
Solution Approach 1:
The patent applies local quality by providing protective wax coverage only in areas where ink design will be applied, rather than uniform coverage across the entire carrier. The gravure sleeve etched cells are configured to deposit wax in specific patterns that match the label design boundaries, eliminating random wax halo formation while maintaining protection where needed.
4Loss of substance
If patterned wax application is implemented, then wax usage is reduced, but application complexity increases
Solution Approach 1:
The patent uses copying by creating a gravure sleeve with etched cells that replicate the desired wax deposition pattern. The sleeve acts as a reusable template or copy of the label design, allowing consistent patterned wax application without requiring complex real-time control systems, thereby reducing wax waste while maintaining manageable system complexity.
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
This approach reduces wax usage, minimizes waste, and enhances label quality by applying a contoured wax release layer that matches the ink design, reducing costs and improving the appearance of labeled articles while eliminating the need for flood-coating and associated quality control issues.
Implementation Method 1
an apparatus including a gravure sleeve and tray with a steam-heated manifold to soften the wax for precise deposition
Implementation Method 2
contacting wax with a surface having at least one etched region thereon, and confronting a carrier with the surface such that at least a portion of the wax transfers from the surface to the carrier
Data Source
AI summary
A wax printing process, apparatus, formulation, and label. The process includes contacting a wax formulation with a surface having at least one etched region thereon, and confronting a carrier with the surface such that at least a portion of the wax transfers from the etched surface to the carrier. The apparatus includes a tray and a manifold positioned in the tray. In another aspect, the apparatus includes a gravure sleeve and a heatable mandrel disposed inside the gravure sleeve. The wax formulation includes a paraffin wax, an ester wax, a hydrocarbon resin, a microcrystalline wax, and an ethylene-vinyl acetate copolymer resin. The label includes a carrier and a wax release layer confronting a surface of the carrier. The wax release layer confronts less that the entire surface of the carrier.