Printed Release Coating for Casting Paper to Reduce Embossing Cost
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Solution Overview
Problem
The existing methods for producing casting papers are expensive and inflexible, making it costly to produce customized papers with varying patterns, as they require expensive embossing drums and materials like polymethylpentene that are prone to distortion under high pressure and heat.
Innovation Solution
A method of forming casting paper by coating a base sheet with a release coating and applying a printed release coating using flexographic, offset, or rotary screen printing techniques, which allows for customizable patterns and is more cost-effective by using curable polymeric materials like trimethylolpropane triacrylate and silicone polymers that are heat-resistant and durable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polymethylpentene is used as the release coating material, then heat resistance is improved, but cost increases and distortion occurs under high pressure or heat above 350°F
Solution Approach 1:
The patent replaces expensive polymethylpentene with a curable coating system that can be applied as a thin layer and cured in place. The coating contains a polymer or polymer precursor that cures to form a heat-resistant release surface, eliminating the need for costly bulk polymethylpentene material while maintaining heat resistance at casting temperatures.
Solution Approach 2:
The patent changes the physical and chemical state of the release coating by using a curable system. The coating is applied in a liquid or paste state, then cured through UV irradiation, electron beam, or thermal curing to transform it into a solid, heat-resistant layer. This parameter change allows the coating to achieve high heat resistance without the cost and distortion issues of polymethylpentene.
2Temperature
If highly crosslinked coatings are used to improve heat resistance, then temperature resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces mechanical embossing drums with a printing-based application system. The curable coating is printed directly onto the paper substrate using conventional printing equipment, then cured in place. This substitution eliminates the need for expensive, pattern-specific embossing drums and their associated mechanical complexity.
Solution Approach 2:
The patent uses curable polymers or polymer precursors that can be applied as liquid coatings and then transformed into solid, heat-resistant layers through curing. This parameter change from liquid to solid state during processing simplifies manufacturing compared to applying pre-formed crosslinked coatings, as the curing process can be integrated into the production line.
3Manufacturing precision
If embossing drums are used to create patterns, then pattern quality is improved, but cost increases and flexibility to change patterns decreases
Solution Approach 1:
The patent uses printing technology to create patterns on the release coating, effectively copying the desired pattern from a master or digital design directly onto the coating material. This allows for easy pattern changes by simply changing the printing template or digital file, without requiring new embossing drums for each pattern.
Solution Approach 2:
The patent makes the pattern creation process dynamic and adaptable by using printing methods that can be easily reconfigured. The printing system allows for rapid changes in pattern design, quantity, and distribution without the fixed, static nature of embossing drums, enabling flexible response to changing product requirements.
4Stability of the object's composition
If conventional coating methods are used, then uniform coverage is achieved, but cost and inflexibility increase
Solution Approach 1:
The patent replaces conventional coating equipment with printing equipment. Printing technology inherently provides controlled, uniform coverage through precise ink or coating deposition, while using standard printing machinery that is more cost-effective and widely available than specialized coating equipment.
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 method enables the production of affordable, flexible, and customizable casting papers that can withstand high temperatures and pressures, allowing for a wider variety of texturized surfaces to be created without the need for expensive embossing drums, thus reducing production costs and increasing design flexibility.
Implementation Method 1
both the release coating and the print coating comprise, independently, a polymeric coating with heat resistance. In one particular embodiment, the curable polymeric material includes a curable monomer (e.g., trimethylolpropane triacrylate), a curable polymer (e.g., an acrylic polymer), and a release agent (e.g., a curable silicone polymer)
Data Source
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AI summary
Methods are generally disclosed for forming and using a casting paper. In one embodiment, the casting paper can be made by coating a first surface of a base sheet with a release coating such that the release coating covers the entire first surface of the base sheet. A printed release coating is then applied on a portion of the first release coating, and is dried or cured as needed to form the casting paper having a textured surface defined by elevated areas corresponding to the printed release coating and valley areas corresponding to exposed areas of the printed release coating. In another embodiment, the casting paper can be made by first printing a base sheet with a patterned, structured coating, then coating over the patterned, structured coating with a release coating such that the release coating covers at least the unprinted areas of the base sheet. The casting paper can be used to form a texturized surface in a substrate.