Vertical Bag-Making Machine Pleat Welding
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Solution Overview
Problem
Conventional double-gusset bag manufacturing processes face inefficiencies due to separate bag-making and filling steps, leading to inconsistent pleat depths and defective welding when forming a spout on the top gusset, resulting in poor loading efficiency and uniformity issues.
Innovation Solution
A vertical bag-making/filling/packaging machine that integrates top and bottom folding units, pleat guides, and heat-welding mechanisms to form uniform pleats and securely attach a spout portion on the top gusset, ensuring consistent fold widths and improved welding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform folding width is applied to both pleats of the top gusset, then filling stability is improved, but welding quality deteriorates due to non-uniform heating temperature
Solution Approach 1:
The patent applies different heating temperatures to different regions of the mouth plug during welding. The outer surface (rear surface) is heated at a higher temperature than the inner surface (front surface), compensating for the heat loss through the uniform pleat structure and achieving uniform welding quality across both pleats while maintaining uniform folding widths for filling stability.
2Adaptability or versatility
If separate bag-making and filling processes are used, then manufacturing flexibility is maintained, but production efficiency deteriorates
Solution Approach 1:
The patent combines the bag-making process and filling process into a single integrated vertical bag-making/filling/packaging machine. The machine forms the bag body from band-shaped plastic film and fills the content in the same continuous operation, eliminating the need for separate processes and significantly improving production efficiency while maintaining flexibility through programmable control.
3Strength
If multiple films are stacked on the inner surface side of the mouth plug, then structural strength is improved, but heating temperature uniformity deteriorates
Solution Approach 1:
The patent applies different heating temperatures to different regions of the mouth plug during welding. The outer surface (rear surface) is heated at a higher temperature than the inner surface (front surface), compensating for the heat loss through the uniform pleat structure and achieving uniform welding quality across both pleats while maintaining uniform folding widths for filling stability.
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 machine efficiently manufactures film packaging bags with uniform pleat widths and securely attached spout portions, enhancing manufacturing efficiency and reducing defective welds, thereby improving loading capacity and product stability.
Implementation Method 1
a mouth plug fusion portion which heat-welds the side edges of the film to the mouth plug together
Implementation Method 2
a pair of heater bars which heat-welds the side edges of the film with the mouth plug therebetween
Implementation Method 3
a pair of cooler bars which cools the mouth plug and the side edges of the film
Implementation Method 4
The first pleat guide presses an outer surface of the film toward an inner surface side to apply tension on the outer surface and release the tension on the first pleat
Data Source
AI summary
A vertical bag-making/filling/packaging machine includes: a top folding portion which forms a first fold by folding one of sides of a band-shaped film into a Z shape; a bottom folding portion which folds a center of the film so that side edges of the film face each other; a first pleat guide which pulls a first pleat of the first fold upright; a spout portion-forming portion which forms a spout portion between the side edges of the film; and a second pleat seal portion which forms a second pleat by heat-welding the side edges of the film together so as to make the film into a tube shape.