Multi-Layer Tube Butt Welding Strength and Seam Integrity
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Solution Overview
Problem
Existing methods for producing packaging tubes face limitations in mechanical strength due to the nature of butt connections, which can only handle small surface areas and limited loads, and often compromise the functional integrity of multi-layer structures.
Innovation Solution
A multi-layer tube design with specific layer configurations, including a barrier layer and adhesion promoters, combined with a butt welding connection and a protective outer layer, enhances mechanical strength and maintains functional integrity while allowing for continuous decoration and improved appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If butt connection is used to connect layers in multi-layer tube production, then the functional integrity of layers is maintained, but the mechanical strength at the connection is limited
Solution Approach 1:
The patent uses composite material structure with an inner tube made of first plastic material and an outer shell made of second plastic material with higher mechanical strength. This composite structure allows the inner tube to maintain functional integrity (barrier properties) while the outer shell provides enhanced mechanical strength to compensate for the limited strength of butt connections.
2Shape
If overlapping strip is used to cover the weld seam, then the appearance is improved, but the mechanical strength at the connection is still limited
Solution Approach 1:
The outer shell made of second plastic material serves dual purposes: it provides enhanced mechanical strength to compensate for limited butt connection strength, and it can be designed to cover or reinforce the weld seam area, improving appearance while maintaining structural integrity.
3Reliability
If multi-layer structure is used, then the barrier function is maintained, but the complexity of production increases
Solution Approach 1:
The tube structure is segmented into two distinct parts: an inner tube made of first plastic material that provides barrier function, and an outer shell made of second plastic material that provides mechanical strength. This segmentation allows each layer to be optimized for its specific function while simplifying the overall production process compared to complex multi-layer co-extrusion.
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 significantly increases the mechanical strength of packaging tubes, enabling them to withstand extreme loads and maintain functional layer effects, while allowing for arbitrary material choices and seamless decoration, even at the weld seam.
Implementation Method 1
intermediate layers made of an adhesion promoter or adhesive are also provided, in particular between layer 7.2 and the adjacent layers 7.1 and 7.3
Implementation Method 2
the two long sides of the flat material are connected to one another, so that a tube-like shaped body is obtained. The connection can be overlapping (FR 2 908 345 A1), preferably butt (DE 35 10 956 A1), in each case by welding
Data Source
Figure 1~2
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Figure 7~8
AI summary
The invention relates to a method for producing packaging, each having a hose-like or tube-like packaging body, wherein a hose-shaped formed body is formed from a flat material having two long sides facing away from each other by means of folding or rolling and by means of the subsequent connection of the long sides in the form of a butt joint, for example by means of butt welding.