Flexible Packaging Mandrel Assembly for Rigidity
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Solution Overview
Problem
Existing flexible packaging technologies face challenges in achieving sufficient mechanical rigidity, leading to issues such as instability, inconsistent mechanical and geometric properties, and difficulties in production and usage, including wall thickness optimization, empty palletization, transport, filling, capping, and closure mechanisms.
Innovation Solution
A plastic packaging design comprising a flexible cylindrical side wall formed from a sheet wound around a mandrel, with at least partially rigid bottom and top elements, including a neck, where the components rest on a mandrel during assembly, ensuring precise positioning and consistent welds, and optimized material usage for enhanced stability and mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If flexible packaging is made without mandrel support, then material usage is reduced and cost is lowered, but mechanical rigidity and production consistency deteriorate
Solution Approach 1:
A mandrel is introduced as an intermediary support element during the welding and assembly process. The mandrel provides internal support to the flexible packaging structure, enabling consistent welding of the bottom and top elements to the side wall while maintaining the desired cylindrical shape. This intermediary support is removed after assembly, leaving the flexible packaging with optimized material usage but with the benefit of production-time rigidity support.
Solution Approach 2:
The mandrel is positioned and prepared before the welding operation begins. The side wall is formed and positioned around the mandrel in advance, and the bottom and top elements are pre-aligned with the mandrel. This preliminary arrangement ensures that during welding, the flexible packaging maintains its geometric integrity and receives uniform welding pressure, improving production consistency without requiring excessive material for structural support.
2Device complexity
If flexible packaging is made without mandrel support, then device complexity is reduced, but manufacturing precision and production consistency deteriorate
Solution Approach 1:
The mandrel serves as a simple yet effective intermediary fixture that provides a reference surface for welding and assembly operations. Rather than requiring complex automated positioning systems, the mandrel physically guides the bottom and top elements into correct alignment with the side wall. This approach maintains manufacturing precision while avoiding the need for sophisticated control systems or multiple adjustment mechanisms.
Solution Approach 2:
The mandrel is designed to be self-aligning and self-positioning within the welding apparatus. Its geometry is specifically designed to automatically guide the flexible packaging components into the correct positions during assembly. This self-service characteristic reduces the need for complex adjustment mechanisms and operator intervention, thereby reducing device complexity while maintaining manufacturing precision.
3Loss of time
If flexible packaging is made without mandrel support, then production time is reduced, but stability and mechanical resistance deteriorate
Solution Approach 1:
The mandrel is pre-positioned and the side wall is pre-formed around it before the welding operation. This preliminary setup ensures that when welding begins, all components are already in their correct positions and orientations. The mandrel maintains this configuration throughout the welding process, enabling rapid welding without requiring post-assembly adjustments or repositioning, thus reducing production time while ensuring stable assembly.
Solution Approach 2:
The mandrel acts as a temporary structural mediator during assembly, providing the mechanical support needed to achieve stable welds quickly. By supporting the flexible packaging structure during the critical welding phase, the mandrel enables faster welding cycles without compromising the stability of the joints. Once welding is complete, the mandrel is removed, leaving the packaging with adequate mechanical resistance from the welded structure.
4Ease of manufacture
If flexible packaging is made without mandrel support, then ease of manufacture is improved, but geometric consistency and mechanical properties deteriorate
Solution Approach 1:
The mandrel serves as a simple physical intermediary that enforces geometric consistency during assembly. Its cylindrical shape and fixed dimensions provide a consistent reference surface that ensures all flexible packaging units are assembled to the same geometric specifications. This simple intermediary device maintains manufacturing precision without requiring complex measurement systems or skilled operator judgment, thereby preserving ease of manufacture.
Data Source
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AI summary
The invention relates to a plastic packaging for liquid or viscous products comprising three distinct elements, a flexible cylindrical side wall made from a sheet rolled around a mandrel, an at least partly rigid base and an at least partly rigid upper part comprising a neck, the packaging being able to stand on said base and having a height H and diameter D, the ratio H/D of which is between 1 and 5 and the side wall and the two other elements, on assembly, rest on a mandrel within the packaging. The invention further relates to a method for production of said packaging.