Hinge-Lid Cigarette Pack Inner Frame Alignment
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Solution Overview
Problem
Conventional hinge-lid cigarette packs often fail to maintain a completely closed position after repeated opening and closing due to inadequate engagement of retention means between the inner frame and the lid, particularly in packs with rounded or beveled vertical edges.
Innovation Solution
A method and apparatus that involve positioning an inner frame on a bundle of cigarettes and folding a blank to form the pack, with the inner frame being moved relative to the partially formed lid to engage retention means during production, ensuring correct alignment and frictional resistance for complete closure without requiring partial opening and re-closing of the lid or longitudinal movement of the bundle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retention means are provided on the inner frame and lid to prevent inadvertent opening, then the lid closure reliability is improved, but the device complexity increases
Solution Approach 1:
The retention means are pre-formed on the inner frame and lid during the manufacturing process, specifically during the folding of the blank. The protrusions and recesses are created as integral features of the packaging structure before assembly, eliminating the need for separate retention mechanism components and reducing overall device complexity while maintaining reliability
Solution Approach 2:
The retention means are integrated into the existing structural elements of the pack. The protrusions are formed on the inner frame and the corresponding recesses on the lid, merging the retention function with the structural framework rather than adding separate retention components, thereby improving reliability without significantly increasing device complexity
2Reliability
If tabs are provided on the inner frame to provide friction engagement with the lid, then the lid retention is improved, but the ease of manufacture decreases for packs with rounded or bevelled edges
Solution Approach 1:
Instead of providing tabs along the entire perimeter of the inner frame, protrusions are provided only at specific locations corresponding to the corners or key engagement points. This localized approach maintains sufficient friction engagement for lid retention while being compatible with rounded or bevelled edge designs and easier to manufacture than continuous peripheral tabs
Solution Approach 2:
The protrusions and recesses are formed during the blank folding process itself, rather than requiring separate post-manufacturing operations. This preliminary formation of retention features integrates them into the existing manufacturing flow for packs with rounded or bevelled edges, maintaining ease of manufacture while achieving reliable lid retention
3Manufacturing precision
If the inner frame is moved relative to the blank during production, then the retention means engagement precision is improved, but the productivity decreases
Solution Approach 1:
The blank is pre-scored and pre-folded at specific locations to create the protrusions and recesses before the final assembly step. This preliminary preparation ensures that when the inner frame is moved relative to the blank, the retention means engage precisely without requiring complex real-time adjustment mechanisms, thus maintaining productivity while achieving engagement precision
Solution Approach 2:
The scoring lines and pre-formed folds in the blank act as intermediaries that guide the relative movement between the inner frame and the blank during assembly. These pre-defined paths ensure precise engagement of the retention means while allowing the movement to occur through simple, fast operations rather than complex positioning mechanisms, balancing precision with productivity
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 ensures that the retention means are correctly engaged during production, ensuring the lid-lock functions correctly when the pack is opened and closed, maintaining a complete closure without gaps, and can be adapted to existing packaging machinery.
Implementation Method 1
provide additional interference between the outer surface of the inner frame and the inner surface of the lid... provide increased friction between the inner frame and the lid as it is opened and closed
Data Source
AI summary
A method for making a hinge-lid pack of cigarettes, which finds particular application in the manufacture of a pack with rounded or beveled vertical edges having retention means to facilitate consistent lid closure, comprises: positioning an inner frame on a bundle of cigarettes; folding a first end of a blank for a hinge-lid cigarette pack over one end of the bundle of cigarettes to at least partially form the lid of the pack; and moving the inner frame relative to the blank in the direction of the at least partially formed lid. Apparatus for making a hinge-lid pack of cigarettes by folding a blank for a hinge-lid cigarette pack about a bundle of cigarettes having an inner frame thereon, includes means for forming a portion of the blank into the lid of the pack, the apparatus further comprises means for moving the inner frame relative to the blank towards the at least partially formed lid. Preferably, the apparatus comprises a wheel indexable between a number of stations, the wheel having a plurality of pockets spaced about its periphery.