Bag Pleating Bellows Lamellar Strip Angle Optimization
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Solution Overview
Problem
Existing machines struggle to efficiently produce a large quantity of fan-shaped ruffles for plastic bags, as they are not suitable for fully automatic integration and have limited production capacity due to worn-out bellows, which are prone to kinking and frequent replacement.
Innovation Solution
A device with bellows made of elastic plastic, featuring lamellar strips connected by durable methods like welding or gluing, allowing angles less than 60° in the unloaded state to reduce stress and extend service life, enabling production of over 400,000 pieces and integration into automatic packaging machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bellows are made from kinked webs of film, then the device can be manufactured simply, but the bellows wear quickly and must be replaced frequently
Solution Approach 1:
The patent changes the angle parameter of the lamellar strips from the conventional 90° to less than 60° in the unloaded state. This parameter change reduces the deflection and stress on the strips during operation, significantly extending the service life of the bellows to over 400,000 pieces while maintaining structural integrity
Solution Approach 2:
The patent uses elastic plastic material for the bellows that combines flexibility with durability. This material choice allows the bellows to withstand repeated compression cycles without kinking or wearing out quickly, resolving the contradiction between ease of manufacture and reliability
2Device complexity
If bellows are made with angles of about 90° in the unloaded state, then the structure is simple, but only up to 200,000 pieces can be formed before bellows wear
Solution Approach 1:
The patent reduces the angle between lamellar strips from 90° to less than 60° in the unloaded state. This geometric parameter change decreases the deflection amplitude during compression cycles, reducing wear and enabling production capacity to exceed 400,000 pieces before bellows replacement is needed
3Ease of manufacture
If thickening occurs at folding points of slat strips, then the bellows can be manufactured from folded web, but the thickening is detrimental to the frill forming process
Solution Approach 1:
The patent extracts and eliminates the harmful thickening at folding points by using a different construction method. Instead of folding the web which creates thickening, the bellows are assembled from flat lamellar strips connected by welding, gluing, or sewing, thereby removing the defect that compromises frill forming quality
Solution Approach 2:
The patent creates a durable connection between lamellar strips through welding, gluing, or sewing, effectively copying the structural integrity needed without the harmful effects of folding-induced thickening. This alternative construction method preserves the ease of manufacture while eliminating the quality defect
4Ease of operation
If the device uses manual loading, then it can process ruffles, but it is not suitable for integration into fully automatic packaging machines
Solution Approach 1:
The patent designs the bellows and work station with dynamic characteristics that allow easy manual operation while also enabling automatic integration. The bellows automatically return to the relieved state after compression, and the device can be positioned on conveyor belts, providing adaptability from manual to fully automatic operation modes
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 significantly increases the production capacity of fan-shaped ruffles while ensuring durability and ease of integration into automated systems, overcoming the limitations of existing machines by maintaining low deflection and minimizing load changes on the strips.
Implementation Method 1
The bellows are advantageously made of elastic plastic. This material is suitable for a high number of load changes.
Data Source
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AI summary
The invention relates to a device for forming the ruching of a bag (10) for the packaging of goods, in particular of bread goods, into the body of which bag the goods are introduced, and the neck (4) of which bag is laid flat, and the device has an upper and a lower bellows (1, 2) composed of connected lamellar strips (3) between which the neck (4) of the bag is placed, and the bellows (1, 2) then travel into each other from an unloaded state, grip the neck (4) of the bag between the lamellar strips (3) from above and below and press it together, the bag (10) is closed with a closure piece (9) by a closure stamp (8), and the bellows (1, 2) return to the unloaded state, wherein the lamellar strips (3), in the unloaded state, are at an angle (X) of less than 60° to each other.