Packaging Material Matte Glossy Cold Seal Adhesive
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Solution Overview
Problem
Packaging materials with cold seal adhesives face challenges in achieving a balance between glossy and matte finishes, as matte coatings often fail to adhere to release films, leading to suboptimal results in complex artwork registration and packaging applications.
Innovation Solution
A packaging material design featuring a substrate with cold seal adhesive on one side and both glossy and matte cold seal release lacquers (CSRL) on the other, where the matte CSRL is fixedly adhered to the glossy CSRL, allowing for a balanced glossy and matte appearance without the matte coating peeling off during unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a matte coating is applied to a release film to achieve matte appearance, then the matte finish is achieved, but the matte coating fails to adhere to the release film
Solution Approach 1:
The patent introduces a primer coating as an intermediary layer between the release film and the matte overprint varnish. This primer layer provides a bonding interface that allows the matte coating to adhere properly to the release film, resolving the adhesion failure issue while maintaining the desired matte appearance.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers: release film, primer coating, and matte overprint varnish. This composite material approach allows each layer to perform its specific function - the release film provides release properties, the primer provides adhesion, and the overprint varnish provides the matte finish.
2Adaptability or versatility
If separate printing of matte and glossy release coatings is used to achieve both finishes, then both glossy and matte areas are achieved, but registration of adjacent edges is challenging leading to suboptimal results
Solution Approach 1:
The patent applies a universal matte overprint varnish coating process that can be applied over the entire printed surface regardless of the underlying glossy or matte areas. This single-step process eliminates the need for separate printing operations and complex registration procedures, while still achieving the desired combination of glossy and matte appearances in different areas.
3Ease of operation
If cold seal adhesive is used for sealing, then sealing is achieved without heat, but blocking occurs between the adhesive and the packaging material when wound into a roll
Solution Approach 1:
The release film acts as an intermediary layer between the cold seal adhesive and the packaging material. During rolling, the release film prevents direct contact and blocking between the adhesive and the packaging material. When sealing is required, the release film can be removed or breached, allowing the adhesive to bond properly.
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
Enables successful winding and unwinding of packaging materials with the cold seal adhesive releasing from both CSRLs, maintaining the matte finish's adhesion to the glossy CSRL, thus achieving a stable and aesthetically balanced packaging solution.
Implementation Method 1
cold seal adhesive (e.g., a pressure-sensitive adhesive), typically coated onto a portion of a polymer film-based structure. Sealing can be effected by means of pressure without the use of heat
Implementation Method 2
it is typical for the polymer film base layer to include an anti-blocking/release agent. This may be an internal treatment that migrates to the surface of the film, or an external coating applied to the film, to form a 'release film'
Data Source
AI summary
A packaging material can include cold seal adhesive on a first side of a substrate, glossy material on a second side of the substrate, and matte material on the glossy material, so that the matte material covers at least a predetermined portion of the glossy material. Each of the glossy and matte materials can be a cold seal release lacquer configured so that when the packaging material is formed into a roll, the cold seal adhesive is releasably adhered to the cold seal release lacquers, the glossy cold seal release lacquer is fixedly adhered to the substrate, and the matte cold seal release lacquer is fixedly cohered to the glossy cold seal release lacquer.