Cigarette Package Folding with Cold and Hot Glue
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Solution Overview
Problem
The challenge in producing packs, such as cigarette packs, lies in accurately connecting folding flaps using a combination of cold and hot glue, where the different setting times and heat sensitivity of these glues can lead to premature fixation issues and incorrect shaping of the packs.
Innovation Solution
The method involves aligning the folded areas of the pack with glue dots applied in specific positions on both flaps, using cold glue on the outer flaps and hot glue on the inner flaps, and then folding the outer flaps into position using movable elements within a molding unit, ensuring precise alignment and fixation before the hot glue sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot melt adhesive is used to join folded flaps, then the curing time is short and productivity is improved, but premature fixation occurs before the package is correctly shaped
Solution Approach 1:
The package is preliminarily shaped using folding profiles and conveyor belt mechanisms before the hot melt adhesive is applied. This preliminary shaping action ensures that the package reaches its correct geometric configuration prior to the adhesive setting, preventing premature fixation issues while maintaining the short curing time advantage of hot melt adhesive.
Solution Approach 2:
Folding profiles and guide elements act as intermediaries between the package flaps and the final shaped configuration. These intermediaries control and maintain the correct geometric relationships of the flaps during the adhesive application and curing process, ensuring precise package shaping while using fast-setting hot melt adhesive.
2Manufacturing precision
If cold glue is used to join folded flaps, then the package can be shaped correctly during longer curing time, but relative displacement of joined flaps occurs during this time
Solution Approach 1:
The package flaps are preliminarily positioned and secured using folding profiles and mechanical guide elements before the cold glue is applied. This preliminary mechanical positioning prevents relative displacement of the flaps during the extended curing period, while still allowing the use of cold glue for its bonding advantages.
Solution Approach 2:
Mechanical guide elements and folding profiles serve as intermediaries that maintain the correct spatial relationships between flaps during the cold glue curing process. These intermediaries prevent unwanted relative displacement while the adhesive cures, ensuring manufacturing precision is maintained throughout the extended curing time.
3Strength
If both cold glue and hot glue are applied to the same flaps, then bonding strength is improved, but premature fixation of hot melt glue joints occurs
Solution Approach 1:
The package is preliminarily shaped and the cold glue is applied first to establish the basic bond. Only after the package reaches its correct geometric configuration does the hot melt adhesive get applied in the final phase. This sequential preliminary action ensures that the hot melt glue sets at the correct position, preventing premature fixation while maintaining enhanced bonding strength from both adhesives.
Solution Approach 2:
The gluing process is segmented into two distinct phases: first cold glue application for initial bonding, then hot melt adhesive application for final securing. This temporal and spatial segmentation of the bonding process allows each adhesive type to perform optimally without causing premature fixation, while both contribute to the overall bonding strength.
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
This approach ensures that the packs are formed with exact shapes and secure connections, maintaining the integrity of the pack structure even under heat exposure, such as from solar radiation.
Implementation Method 1
The flaps can be joined using cold glue and/or hot melt adhesive
Implementation Method 2
The relevant characteristic of hot melt adhesive is its comparatively short curing time
Data Source
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AI summary
In the production of cigarette packs 10, especially hinged cartons, these are largely completed in the area of a folding turret 16, but transported along a packing lane (17) with lateral folding flaps in an intermediate folded position, coated with glue in the area of the folding flaps, and transferred to a forming turret (18) for completion. In the forming turret, the glued folding flaps are folded into the pack-specific position.