Open-Mouth Bag Bottom Seam Welding Without Excess Film
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Solution Overview
Problem
Existing bag manufacturing methods for open-mouth bags result in excess film lengths at the bottom seam, leading to potential accumulation of dirt particles and compromised hygiene, especially when filling foodstuffs like powdered milk, due to difficulties in cutting off the excess film length without sealing the head end or requiring additional welding stations, which increase overhead and decrease system performance.
Innovation Solution
A bag manufacturing apparatus and method that controls the relative motion between the bag body and film to create a distance before welding, ensuring the welding means extend up to and beyond the bag body's bottom end, eliminating excess film lengths by forming a product-proof margin weld, using cutting and welding devices positioned in overlapping sections to prevent film layers from being welded together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a product-proof margin weld is attempted by cutting the film immediately next to the weld seam, then excess film length is eliminated, but the head end of the preceding open-mouth bag is sealed or a short excess film length remains
Solution Approach 1:
The bag body is separated from the bag film before the welding process begins. The control device causes relative motion between the bag body and bag film to create a distance between them prior to making the bottom seam, ensuring the welding means only weld the bag body layers without affecting the bag film or sealing the head end
2Manufacturing precision
If the excess film length is cut off subsequently, then the margin weld is achieved, but automatic processes become difficult to implement and film consumption increases
Solution Approach 1:
The bag body is separated from the bag film before welding, creating a distance between them. This preliminary separation allows the welding means to extend up to and beyond the bottom end of the bag body during welding, eliminating excess film length automatically during the welding process itself, without requiring subsequent cutting operations
Solution Approach 2:
The control device dynamically adjusts the relative positions of the bag body and bag film during the manufacturing process. By causing relative motion to create a distance between them before welding, the system automatically manages film length without complex post-welding cutting mechanisms
3Manufacturing precision
If a second bottom seam welding station is added to weld excess film lengths together, then excess film is eliminated, but overhead increases and system performance decreases
Solution Approach 1:
The bag body is separated from the bag film before the welding process begins. This preliminary separation ensures that when the welding means make the bottom seam, they only weld the bag body layers and not the bag film. The welding means can extend up to and beyond the bottom end of the bag body, eliminating excess film length in a single welding operation
Solution Approach 2:
The single welding device performs multiple functions: it creates the bottom seam by welding the bag body layers together and simultaneously eliminates excess film length by extending the weld up to and beyond the bottom end of the bag body. This multi-functionality eliminates the need for a second welding station
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
Ensures a high degree of hygiene by preventing excess film lengths at the bottom seam, allowing for efficient and hygienic filling of bulk goods, particularly powdery foodstuffs, without increasing apparatus overhead or decreasing system performance.
Implementation Method 1
at least one welding device with welding means for making (at least) one bottom seam in the bag film
Implementation Method 2
at least one cutting device having (at least) one cutting means is provided for separating a predetermined length of the bag film to form the bag body of an open-mouth bag
Data Source
AI summary
Apparatus and method of manufacturing open-mouth bags, comprising a storage device with a supply of bag film, a control device for controlling, a conveying device for conveying the bag film and/or the bag body along a conveying path, a welding device with welding means for making a bottom seam in the bag film and a cutting device with a cutting means for separating a predetermined film length of the bag film to form the bag body of an open-mouth bag. The control device controls the conveying device so as to cause a relative motion of the bag body and the bag film and a distance between the bag body and the bag film is generated prior to making the bottom seam. The control device controls the conveying device and the welding means so that while welding the bottom seam the welding means extend at least up to the bottom end of the bag body.