Longitudinal Welding Plastic Film Packaging Production
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Solution Overview
Problem
Existing methods for producing packaging from plastic film are limited by their cyclical nature, requiring expensive and complex machinery, and they do not allow for continuous welding or efficient production of packaging with varying compartment sizes and shapes.
Innovation Solution
A method and device for continuous longitudinal welding of plastic film layers, enabling the production of packaging with adjustable width and height, multiple compartments, and low shrinkage, while reducing machine costs and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transverse welding of film layers is used, then packaging can be produced in cycles, but production speed is limited and machine complexity increases
Solution Approach 1:
The patent inverts the conventional transverse welding approach by implementing longitudinal welding instead. The film layers are welded along their length rather than across their width, which fundamentally changes the production flow from cyclic to continuous, thereby increasing speed while reducing machine complexity.
Solution Approach 2:
The longitudinal welding method enables continuous welding of film layers without interruption. The film is fed continuously through the welding zone, and the welding process operates without the start-stop cycles inherent in transverse welding, maintaining continuous productive action throughout the process.
2Productivity
If transverse welding is used, then packaging production is possible, but only in cyclic intervals limiting high-speed production
Solution Approach 1:
The longitudinal welding process eliminates cyclic interruptions by maintaining continuous film feed and continuous welding action. The welding zone moves continuously along with the film, eliminating the time losses associated with starting and stopping cyclic welding operations.
3Ease of manufacture
If complex machines are used for cyclical welding, then packaging production is achievable, but machine costs increase
Solution Approach 1:
By inverting the welding direction from transverse to longitudinal, the patent simplifies the machine design. The longitudinal approach requires fewer complex positioning and repositioning mechanisms, reducing overall machine complexity and cost while maintaining full production capability.
4Productivity
If longitudinal welding is used, then continuous welding is possible, but new challenges in film handling arise
Solution Approach 1:
The continuous longitudinal welding requires continuous film feed, which is achieved through simplified feed rollers and tension control mechanisms. The continuous operation eliminates the need for complex repositioning and re-alignment mechanisms required in cyclic systems, actually easing operational complexity despite the continuous nature.
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 allows for high-speed, high-quality packaging production with consistent repeatability, reduced machine costs, and increased efficiency in producing packaging with varied compartment configurations, using fewer machine parts and lower production costs.
Implementation Method 1
at least one longitudinal weld seam (8) is produced by means of at least one longitudinal sealing bar (22) or by means of at least one pair of longitudinal sealing bars (22a, 22b), in that the at least one outer layer (3, 6) is attached to the associated inner layer (4, 5) by means of at least one longitudinal weld seam (9)
Implementation Method 2
The longitudinal sealing bar or pair of longitudinal sealing bars is arranged in the device perpendicular to the feed of the inner layers to be welded
Implementation Method 3
At least for the outer layer (3, 6), a bidirectionally shrinkable plastic film is used
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a method for producing packs (1) made of plastics film, having at least one compartment (7a, 7b, 7c, 7d, 7e, 7f), for articles, in particular for containers. According to the invention, two layers (4, 5) made of plastics film which are located one above the other are welded continuously or cyclically with at least one longitudinal weld (8), subsequently at least one further outer layer (3, 6) made of plastics film is placed on the two welded inner layers (4, 5) and is fastened continuously or cyclically to these already welded inner layers (4, 5). Furthermore, the invention relates to a device (15a, 15b) for producing packs (1) made of plastics film, having at least one compartment(7a, 7b, 7c, 7d, 7e, 7f), for articles, in particular for containers. The invention also relates to a pack (1) for articles, in particular for containers. Furthermore, the invention relates to a row of packs.