Label Lid With Release Coating for Matrix Stripping
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Solution Overview
Problem
Conventional packaging containers face issues with multiple reclosures, tearing/splitting of lidding material due to excessive adhesion, and inefficient production processes, particularly with light, fragile, or flexible materials, leading to decreased production efficiency and limited material selection for label construction.
Innovation Solution
A process involving a facestock layer with a removable adhesive layer and a heat-seal layer, where a release coating is applied to reduce peel strength, allowing for efficient matrix stripping and improved reclosability without the need for a release liner, using specific materials like polyester and polypropylene, and coatings such as silicone and fluoropolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release liner is used in the removable adhesive layer, then the label can be easily applied and removed, but the production process becomes more complex and costly with additional stripping steps
Solution Approach 1:
The invention extracts and eliminates the release liner component from the label structure. By removing this intermediate element, the patent simplifies the overall construction to consist of only the facestock layer with removable adhesive and the heat-seal layer, thereby reducing production complexity and eliminating additional stripping steps while maintaining the core functionality of label application and removal
Solution Approach 2:
The patent replaces the reusable release liner with a disposable, integrated removable adhesive layer that is directly applied to the facestock. This eliminates the need for separate release liner materials and the complex process of applying and removing liners during production, reducing both material costs and process complexity
2Reliability
If high adhesion is used in the lidding material, then the seal is strong and reliable, but the material tears or splits during reclosure operations
Solution Approach 1:
The invention applies different adhesive properties to different layers: the facestock layer has removable adhesive with lower strength for easy label removal and reclosure, while the heat-seal layer has high-strength heat-activated adhesive for reliable sealing. This local differentiation of adhesive strength allows the label to maintain strong seals during use while enabling easy reclosure operations without tearing
Solution Approach 2:
The patent changes the activation parameter of the adhesive system by using heat-activated adhesive in the heat-seal layer rather than pressure-sensitive adhesive. This allows the seal to achieve high strength through thermal activation during the sealing process, while the removable adhesive layer maintains lower strength for easy manual removal and reclosure, preventing material tearing
3Adaptability or versatility
If light, fragile, or flexible materials are used for label construction, then material selection is expanded and costs are reduced, but the label matrix breaks or damages more easily during production
Solution Approach 1:
The invention uses composite material construction with the facestock layer providing structural integrity and the heat-seal layer providing sealing functionality. This layered composite structure allows the use of lighter, more flexible materials while maintaining overall label strength and matrix integrity during production, as each layer contributes specific properties that compensate for the reduced strength of individual lightweight materials
4Reliability
If multiple process steps are used to form reclosable lidding material, then the lidding material achieves desired properties, but production costs become prohibitive
Solution Approach 1:
The invention merges the functions of the release liner and the removable adhesive into a single integrated removable adhesive layer applied directly to the facestock. This consolidation eliminates the need for separate process steps of applying and removing release liners, reducing manufacturing complexity and cost while maintaining the reclosable functionality of the lidding material
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 process enhances matrix stripping efficiency, allows for multiple reclosures, and expands material options for label construction, improving heat stability and reducing production costs by eliminating the need for additional stripping steps and using a wider variety of container materials.
Implementation Method 1
applying a release coating to the first side of heat-seal layer before laminating step (c)
Implementation Method 2
laminating the first side of the facestock layer to a first side of a heat-seal layer
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The present subject matter relates to a label lid for sealing an opening in a packaging container. The label comprises a facestock layer, a removable adhesive layer, a heat- seal layer, and an optional release coating, wherein the removable adhesive layer does not include a release liner. The removable adhesive layer can be coated on the heat-seal layer or the facestock layer. Optionally, a release coating can be applied to the heat-seal layer or the facestock layer. The composition of the layers used in specific arrangements provides unique performance characteristics for the label for improved sealing, reclosure, and matrix stripping properties.