Resealable Package With Patterned Adhesive And Score Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing packaging solutions with flexible film-based lidding materials face challenges in providing easy opening and resealing while minimizing leakage, particularly in maintaining the integrity of contents during repeated use.
Innovation Solution
A multi-layer lidding material with a patterned adhesive layer and score lines allows for easy peeling and resealing, featuring a central permanent adhesive and pressure-sensitive adhesive perimeter, along with undercut score lines for secure attachment and separation, ensuring effective sealing and resealing of the package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible film-based lidding material is used to seal a rigid base member, then easy opening and resealing is enabled, but leakage of contents occurs during repeated use
Solution Approach 1:
The lidding member incorporates different adhesive types in specific locations: a permanent adhesive in the central region for reliable sealing, and a pressure-sensitive adhesive in the perimeter region for easy peeling and resealing. This local differentiation allows the lidding to provide both easy operation and leakage prevention in their respective zones.
Solution Approach 2:
The adhesive layer is segmented into distinct functional zones with different adhesive properties. The permanent adhesive portion provides strong, leak-proof sealing in the center, while the pressure-sensitive adhesive portion enables easy peeling and resealing at the perimeter. This segmentation resolves the contradiction by assigning different functional qualities to different regions of the same lidding structure.
2Reliability
If a patterned adhesive with permanent adhesive is used to secure the lidding to the base member, then strong sealing is achieved, but easy separation for opening becomes difficult
Solution Approach 1:
The adhesive layer is designed with spatially varying adhesive properties: strong permanent adhesive in the central sealing region for reliable sealing, and weaker pressure-sensitive adhesive at the perimeter for easy separation. This local quality differentiation allows the lidding to provide both strong sealing and easy opening without compromise.
Solution Approach 2:
The adhesive system is segmented into two distinct adhesive types positioned in different locations. The permanent adhesive segment provides robust sealing where needed, while the pressure-sensitive adhesive segment facilitates easy peeling and resealing operations, resolving the contradiction between sealing strength and ease of separation.
3Ease of operation
If the lidding is designed to be peeled away from the flange for access, then easy opening is provided, but resealing integrity deteriorates
Solution Approach 1:
The perimeter region of the lidding incorporates pressure-sensitive adhesive that maintains adhesive properties after peeling, enabling effective resealing. The central region uses permanent adhesive that ensures integrity during the peeling process. This local quality differentiation allows the lidding to be easily peeled for opening while maintaining resealing integrity when closed.
Solution Approach 2:
The adhesive layer is segmented into pressure-sensitive adhesive at the perimeter for easy peeling and effective resealing, and permanent adhesive in the center for maintaining sealing integrity during operation. This segmentation enables the lidding to provide both easy opening and reliable resealing integrity.
4Ease of operation
If score lines are added to facilitate peeling, then easy opening is achieved, but structural strength of the lidding is reduced
Solution Approach 1:
The score lines are provided as partial features that guide and initiate the peeling process without completely compromising the lidding structure. The score lines reduce the peeling force required by creating stress concentration points, while the overall lidding structure maintains sufficient strength through its multi-layer construction and adhesive bonding.
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 solution enables easy access to package contents while maintaining product integrity by allowing secure peeling and resealing, reducing leakage and enhancing user convenience.
Implementation Method 1
a second layer laminated to the first layer via an adhesive layer
Implementation Method 2
The pressure sensitive adhesive portion permits separation of the perimeter of the first layer, outward of the score line, from the second layer
Implementation Method 3
The lidding member is configured to be heat sealed to the flange of the base member
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A package (10) is defined by a rigid base member (12) and a peripheral flange surface. A flexible lidding member (16) is heat sealed to the flange (14). The lidding member includes a first layer (18) having a perimeter portion fixed to the flange and a second layer (20) adhered to the first layer. An adhesive layer (22) includes a permanent adhesive central portion (26) and a perimeter pressure sensitive adhesive portion (24) overlapping with the flange. A central score line (28) is provided within the first layer, surrounding the central adhesive portion. A tab portion (38) is formed as part of the perimeter portion of the lidding member and includes an edge score line (40) formed in the first layer directly adjacent the fixed perimeter portion of the first layer.