Foil Welding Elongation Device for Tubular Parts
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Solution Overview
Problem
Conventional film welding processes in commercial production plants often result in film stretching, poor sealing, pinching, wrinkling, and suboptimal strength due to the mechanical stress of wrapping films around three-dimensional connection parts, leading to elongation issues and suboptimal weld quality.
Innovation Solution
An elongation device is used to extend the film outside the connection area, providing a length reserve that allows the film to elongate without significant tensile forces, using a deforming tool to create a corrugated or wavy shape, which can be heated to facilitate deformation, ensuring smooth transitions and controlled elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the film is wrapped around the three-dimensional connection part during conventional welding, then the connection part is securely attached to the foil, but the film undergoes strong mechanical stress causing stretching, pinching, and wrinkling that compromises weld quality
Solution Approach 1:
The invention applies preliminary action by extending the film length before the welding process. An extension device creates additional length reserve in the film web prior to wrapping it around the connection part, allowing the film to accommodate the three-dimensional shape without excessive tensile stress during welding, thereby preventing pinching and wrinkling while maintaining secure attachment
2Ease of operation
If the film is held at the edge by transport devices during welding, then the film can be positioned and transported, but the film cannot elongate smoothly causing stretching and poor sealing
Solution Approach 1:
The extension device performs preliminary action by creating length reserve in the film before the welding and sealing operations. This pre-extension allows the film to flow smoothly around the connection part without being constrained by edge-holding transport devices, ensuring both ease of positioning and reliable sealing
3Shape
If the connection part development length is longer than the direct connection path, then the film can wrap around the three-dimensional shape, but the film must be forcibly lengthened causing stress and suboptimal weld strength
Solution Approach 1:
The extension device applies preliminary action by pre-lengthening the film in a controlled manner before the wrapping process. This creates a length reserve that allows the film to accommodate the extended development path of the three-dimensional connection part without excessive tensile stress, preventing film stretching and maintaining optimal strength adjacent to the weld area
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 significantly reduces mechanical stress during welding, achieving excellent welding results with improved film strength and sealing quality by allowing the film to draw on the extended length reserve during wrapping around connection parts.
Implementation Method 1
using a deforming tool to create a corrugated or wavy shape
Implementation Method 2
which can be heated to facilitate deformation
Data Source
Figure 1~4
Figure 5~7
AI summary
The invention relates to an apparatus for welding a joining region of a foil to a connecting part, particularly two foils to a tubular connecting part. Conventional apparatuses are associated with the risk of steep workpiece flanges causing uncontrolled weaknesses in the foil and the weld seam. According to the invention, an extension of the foil outside of the joining region is provided in a controlled manner such that the foil has spare length. In this connection, the invention further relates to the use of a foil, to a method for welding, to a system for producing bag, and to a bag.