Packaging Bag Manufacturing with Open Cross Bottoms
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Solution Overview
Problem
Conventional packaging sack manufacturing methods require forming a closed tube, which increases production time and makes it difficult to fill large or bulky goods due to a small filling opening.
Innovation Solution
A method involving folding a material web to create a packaging sack with a filling opening along the longest side, eliminating the need for a closed tube and allowing for easier filling, using a web of material that can be single or multi-layered, folded along its transverse or longitudinal extent, and forming open cross bottoms to create side walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a closed tube is formed by gluing opposite edges of the material web, then the structural integrity of the packaging sack is improved, but the production time increases due to glue application and drying requirements
Solution Approach 1:
The invention extracts and eliminates the tube formation step from the manufacturing process. Instead of forming a closed tube by gluing opposite edges, the method uses a single web folded along its length with cross bottoms formed only on the side edges, removing the need for glue application and drying time while maintaining structural integrity through the folded construction
Solution Approach 2:
The invention segments the bottom formation process by applying cross bottoms only to the side edges rather than forming a complete closed tube. This segmentation allows the front and back surfaces to remain open, eliminating the need for glueing while maintaining sufficient structural support for the packaging sack
2Shape
If the packaging sack is formed with a conventional closed tube structure, then the bottom surface and top surface are significantly smaller than the front and rear, but this results in a small filling opening that makes it difficult to pack larger and bulky cargo
Solution Approach 1:
The invention inverts the conventional approach by not closing the front and back surfaces of the packaging sack. Instead of forming a closed tube and leaving only side openings, the method opens the front and back while forming cross bottoms only on the sides, creating a large filling opening that spans the entire width of the sack for easy insertion of bulky goods
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a method for producing a packaging bag (22), comprising the steps of: a) providing a web of material (2), b) folding the web of material (2) along a first extension of the web of material (2) so that a fold (4) is obtained which divides the web of material (2) into a first web part (6) and a second web part (8), wherein the web parts (6, 8) each have a first side edge (12, 14) and a second side edge (16, 18) and the side edges (12, 14, 16, 18) extend away from the fold (4), and c) forming flaps (26) on the first side edges (12, 14) and flaps (26) on the second side edges (16, 18) and joining the flaps (26) to form cross bottoms (24) open on one side, which form the side walls of the packaging bag (22).