Multi-layer Film with Embedded Tacky Layer for Reclosable Packages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reclosable film packages often require multiple adhesives or labels, increasing manufacturing complexity and cost, and can be difficult for consumers to open and reseal due to the need for high force to fracture the film.
Innovation Solution
A multi-layer film with an embedded tacky layer and a release layer, allowing for easy opening and resealing without the need for multiple adhesives or labels, using a single-step coextrusion process to integrate the tacky layer between outer and inner film layers, with specific cuts and adhesives to facilitate easy manipulation by consumers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple adhesives or labels are used to create reclosable packages, then the reclosable feature is achieved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple adhesive functions into a single integrated adhesive layer. The adhesive layer contains both permanent adhesive regions (for sealing) and pressure-sensitive adhesive regions (for reclosing), eliminating the need for separate adhesive applications and reducing manufacturing steps while maintaining reliable reclosable functionality
Solution Approach 2:
The single adhesive layer serves multiple functions: it provides permanent bonding in certain regions and pressure-sensitive adhesion in other regions. This multi-functional adhesive layer replaces what would traditionally require multiple different adhesives or adhesive-plus-label combinations, simplifying the overall package structure
2Reliability
If traditional heat seals are used to provide reclose feature, then the package can be reclosed, but a large amount of force is required to fracture the film which is difficult for consumers to apply and control
Solution Approach 1:
The adhesive layer has spatially varying properties with permanent adhesive regions providing strong bonding and pressure-sensitive adhesive regions providing controllable, lower-force adhesion. This local differentiation allows the package to maintain seal integrity while enabling easy consumer operation in the reclose regions without requiring excessive force
Solution Approach 2:
The patent changes the adhesive parameter (tack strength) across different regions of the adhesive layer. By varying the adhesive properties from permanent (high strength) to pressure-sensitive (lower, controllable strength), the package enables easy opening and reclosing while maintaining reliable sealing where needed
Data Source
AI summary
A multi-layer film and a film package made from the film are described herein that provide resealing capabilities by utilizing a tacky layer within the multi-layer film. The multi-layer film can include an outer film portion including the embedded tacky layer and an inner film portion. An opening feature formed in the multi-layer film includes a flap configured to be manipulated by a user to create an opening through the multi-layer film. The inner film portion can include a release layer configured specifically to interact with the tacky layer to provide a desired separation peel force and resealing functionalities. The outer film portion can include an outer film layer disposed on an opposite side of the tacky layer from the release layer that is configured to permanently adhere to the tacky layer.