Hinged-Lid Tobacco Pack Label Structure for Low Opening Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cigarette packs with hinged lids are difficult to open due to high initial opening force, and the label adhesive is prone to failure with repeated use.
Innovation Solution
A label with an intermediate portion that forms an S-shape fold during partial opening, weakened by reduced width or cuts, to reduce the force required for initial lid rotation and improve adhesive durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the label is rigid and fully attached to the lid, then the seal is strong, but the initial opening force becomes too high
Solution Approach 1:
The label is segmented into three distinct regions: a first region attached to the barrier layer, a second region attached to the lid, and an intermediate portion connecting them. This segmentation allows the intermediate portion to deform and reduce opening force while the first and second regions maintain seal integrity.
Solution Approach 2:
Different regions of the label have different mechanical properties. The intermediate portion is designed to be weaker and more flexible than the first and second regions, allowing it to accommodate deformation during opening while maintaining overall seal strength.
2Ease of operation
If the label is peeled back completely, then access to the bundle is easy, but the adhesive fails with repeated use
Solution Approach 1:
The intermediate portion is pre-configured to form an S-shaped fold during partial opening, which preliminarily absorbs the deformation stress before the adhesive is fully engaged during resealing, reducing cumulative stress on the adhesive.
Solution Approach 2:
The label's width parameter is varied along its length, with the intermediate portion having a reduced cumulative width compared to the first and second regions. This parameter change creates a stress distribution that protects the adhesive bonds.
3Strength
If the intermediate portion has full width like the other regions, then the label is strong, but the opening force remains too high
Solution Approach 1:
The label exhibits local quality variations with the intermediate portion having different dimensions and strength characteristics compared to the first and second regions. This localized weakness in the intermediate portion reduces opening force while the stronger first and second regions maintain seal integrity.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pack comprising: a base, the base containing a group of tobacco industry products wrapped in a barrier layer to form a bundle; a lid mounted to the base for rotation between open and closed positions; a section in the barrier layer to define an extraction opening for the extraction of tobacco industry products when the lid is in an open position; and a label having first and second surfaces on opposite sides of the label. The first surface is formed by a first region of the label attached to the section of the barrier layer and the second surface is formed by a second region of the label attached to the lid. An intermediate portion extends between said first and second regions and is configured to be weaker than each of the first and second regions.