Composite Tear-Strip Label for Seal Integrity and Easy Opening
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Solution Overview
Problem
Existing smokeless tobacco containers require manual opening with fingernails or tools, compromising seal integrity and shelf stability.
Innovation Solution
A label with a tear strip featuring a polymer inner web with weakened portions, scores, or cuts, bonded to a polymer or paper outer web, allowing easy opening without tools and maintaining seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a label is used to seal the base to the lid, then shelf stability and tamper evidence are improved, but manual opening with tools is required which compromises seal integrity
Solution Approach 1:
The label is segmented into two distinct webs: an outer web providing the seal surface and an inner web containing the tear strip with weakened portions. This segmentation allows the label to function both as a secure seal and as an easily openable package, resolving the contradiction between seal integrity and opening ease.
Solution Approach 2:
The inner web is pre-weakened with score lines, cuts, or perforations during manufacturing to create a tear strip. This preliminary action enables the consumer to easily tear the label open with their fingers without requiring tools, while the outer web remains intact to maintain seal integrity until opening.
2Strength
If the label is made strong to maintain seal integrity, then shelf stability is improved, but easy tearing without tools becomes difficult
Solution Approach 1:
Different regions of the label have different mechanical properties: the outer web is designed to be strong and intact for sealing, while the inner web contains localized weakened portions (score lines, cuts, or perforations) that facilitate easy tearing. This local differentiation resolves the contradiction between overall label strength and localized tearing ease.
Solution Approach 2:
The label uses a composite structure with an outer web (polymer film or paper) and an inner web (polymer) bonded together. The inner web's weakened portions create a tear strip that is easier to separate, while the outer web maintains the structural integrity and sealing function, resolving the strength versus tearing ease contradiction.
3Ease of operation
If the tear strip is positioned to enable easy opening, then opening convenience is improved, but seal integrity may be compromised
Solution Approach 1:
The label is divided into an outer web that maintains the seal and an inner web that provides the tear strip functionality. The tear strip is positioned between portions of the label adhesively bonded to the base and lid, allowing easy opening while the outer web remains intact to preserve seal integrity.
Solution Approach 2:
The inner web acts as an intermediary layer between the outer web and the container surfaces. The weakened portions in the inner web facilitate easy tearing for opening, while the outer web serves as the primary sealing surface that maintains integrity until the package is intentionally opened.
Data Source
AI summary
Articles of manufacture, products, and packaging methods are provided that include a label with a tear strip. A labeled container includes a base, a lid, and a label sealing the base to the lid. The base includes a bottom wall and a base side wall. The lid includes a top wall and a lid skirt. The lid mates with the base to define an interior space. The label has a front face and a rear face. The label includes an outer web including polymer film, paper, or a combination thereof and an inner web of polymer. A tear strip is defined in the inner web by one or more weakened portion, score lines, or cuts in the inner web. The rear face of the label is adhesively bonded to the base side wall and to the lid skirt to form a seal between the base and the lid. The tear strip is positioned between a portion of the label adhesive bonded to the base side wall and a portion of the label adhesively bonded to the lid skirt. The tear strip can be used to open the container.