Flexible Packaging With Internal Release Liner
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Solution Overview
Problem
Flexible polymeric packaging structures often fail to maintain integrity when containing reactive materials, as these materials can crosslink with the packaging layers, making it difficult to open the packaging without significant soaking.
Innovation Solution
A polymeric-based packaging structure utilizing a release liner with a cured silicone layer facing the interior, which is not present in the seal regions, allowing internal reactions to occur without compromising the packaging structure, and using a co-extruded PE-based sealant layer and nylon outer layer for adhesive bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible polymeric packaging structures are used to contain reactive materials, then the packaging provides flexibility and containment, but the reactive materials crosslink with the packaging layers making it difficult to open
Solution Approach 1:
The packaging structure is segmented into distinct functional layers: a release liner with silicone coating that can be easily separated from the reactive materials, and a separate polymeric packaging layer. This segmentation allows the release liner to protect during storage while enabling easy removal after reaction, resolving the contradiction between containment and ease of opening.
Solution Approach 2:
A release liner with silicone coating acts as an intermediary barrier between the reactive materials and the polymeric packaging structure. The silicone coating prevents direct crosslinking between reactive materials and the packaging polymer, allowing the packaging to maintain integrity while enabling easy separation after the reaction is complete.
2Reliability
If reactive materials are allowed to react within the packaging, then the chemical reaction occurs as desired, but the packaging structure becomes compromised by cross-linking
Solution Approach 1:
The release liner with silicone coating serves as a protective intermediary that allows the chemical reaction to proceed completely while preventing the reactive materials from crosslinking with the polymeric packaging structure. The silicone layer is chemically inert to the reaction, ensuring both reaction completion and packaging integrity.
Solution Approach 2:
The silicone-coated release liner creates a chemically inert environment between the reactive materials and the polymeric packaging. The silicone coating does not react with or crosslink with the reactive materials, allowing the desired chemical reaction to occur while protecting the packaging structure from degradation.
3Ease of operation
If a release liner with silicone layer is used, then cross-linking is prevented and easy removal is achieved, but the seal regions cannot be silicone-free
Solution Approach 1:
The release liner is configured with local quality variations: the silicone coating is present in the interior regions to prevent crosslinking and enable easy removal, but deliberately absent from the seal regions to ensure proper sealing. This localized differentiation resolves the contradiction between ease of removal and seal functionality.
Solution Approach 2:
The release liner structure is segmented into different functional zones: a silicone-coated interior region for preventing crosslinking and facilitating removal, and a silicone-free seal region for creating secure seals. This spatial segmentation allows each region to perform its specific function without interfering with the other.
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 internal reactions in packaging without cross-linking with the packaging, allowing easy removal of reactive materials and maintaining the packaging's integrity, while the silicone layer acts as a shield preventing adverse reactions with the packaging materials.
Implementation Method 1
the release liner comprises a substrate layer and a silicone layer that comprises cured silicone... the silicone layer of the release liner faces the interior of the packaging structure and is designed to be adjacent the reactive materials
Implementation Method 2
an adhesive adjacent the film layer, wherein the adhesive is pattern applied such that it is disposed within an interior region of the film layer
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The invention comprises a package for reactive materials comprising a panel defining a first end, a second end opposite the first end, and at least two side edges. The panel comprises at least one film layer, an adhesive adjacent the film layer, wherein the adhesive is pattern applied such that it is disposed within an interior region of the film layer and wherein a perimeter of the film layer is adhesive-free adjacent each of the first end, second end, and side edges, and a release liner comprising a substrate layer and a cured silicone layer. The release liner is adhered to the film layer via the adhesive, the substrate layer of the release liner is disposed adjacent the film layer, and a perimeter of the release liner is smaller than the perimeter of the film structure. In an embodiment, the panel comprises a tubular body and the side edges are sealed together to form a fin seal, the first end is sealed closed to form an end seal, and the second end is sealed closed to form an end seal.