Cigarette Package Lid Fatigued Join Separation
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Solution Overview
Problem
Existing cigarette packages with a tearable separation line often experience unpredictable cracking, leading to damaged appearances when the lid is opened, and this can cause production issues during folding.
Innovation Solution
A cigarette package design featuring a parallelepiped outer box with a parting line that includes perforations at specified intervals and fatigued joins, ensuring the lid separates infallibly from the box body along the parting line, and a method for producing this package by forming fatigued joins during the folding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separation line is made with longer joins connecting adjacent perforations, then the structural integrity of the blank is maintained, but the crack may deviate from the separation line causing damaged appearance
Solution Approach 1:
The separation line is divided into multiple perforations spaced at specified intervals, with fatigued joins connecting adjacent perforations. This segmentation allows the crack to be contained within the perforated structure, preventing deviation from the intended separation path while maintaining controlled separability.
Solution Approach 2:
The joins of the separation line are pre-fatigued during manufacturing to reduce their strength before final use. This preliminary action ensures that when the lid is opened, the crack follows the separation line predictably, as the fatigued joins are already weakened and ready to break at the correct location.
2Reliability
If the joins of the separation line are made shorter to prevent crack deviation, then the crack follows the separation line reliably, but the blank splits during folding causing production failure
Solution Approach 1:
The joins are fatigued during the manufacturing process before folding, which pre-weakens them without completely breaking them. This allows the blank to be folded successfully while ensuring that during final opening, the separation occurs reliably along the intended line without causing blank splitting.
Solution Approach 2:
The strength parameter of the joins is modified through fatiguing during manufacturing. The joins are weakened to a specific degree that allows them to remain intact during folding but break predictably during lid opening, resolving the contradiction between manufacturing ease and separation reliability.
3Ease of operation
If a separation line is provided to enable lid opening, then the lid can be separated from the box body, but production stability is compromised due to unpredictable cracking
Solution Approach 1:
The separation line is structured with multiple perforations and fatigued joins, creating a segmented path that guides the crack along a predetermined route. This segmentation ensures that the lid opening operation is reliable and repeatable, improving production stability while maintaining ease of operation.
Solution Approach 2:
The fatigued joins automatically guide the crack along the separation line without requiring external intervention or complex mechanisms. The structure itself serves to direct the crack path, making the separation process self-guided and predictable, thereby stabilizing production.
Data Source
Figure 1
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Figure 3~4
AI summary
A cigarette package is provided with a box body (8) and a tongue lid (10). The tongue lid (10) includes a top wall (12) and a tongue (14) adapted such that the top wall closes an open end of the box body (8) and the tongue overlies a front wall (30) of the box body (8) at the time the cigarette package is made, and connecting lugs (20) in a pair joined to the opposite side edges of the tongue (14) by side separation lines (26), respectively, and bonded to the opposite side faces of the box body (8), respectively. The side separation lines (26) each has slits (59) arranged at specified intervals and portions connecting the adjacent slits (59). The connecting portions are formed into fatigue joins (60) by applying a load.