Bag Separation Cylinder Speed Differential
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Solution Overview
Problem
Existing bag production methods require multiple pairs of cylinders and complex arrangements to separate bags and waste pieces efficiently, leading to machine bulkiness, high costs, and difficulties in handling long waste pieces.
Innovation Solution
A method using two pairs of separation cylinders with differential peripheral speeds to perform both bag separation and waste piece separation steps, where the first pair retains the waste piece during the first step and the second pair clamps and tears it off during the second step, allowing for a compact machine design and improved waste piece handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pair of separation cylinders is used to separate both bags and waste pieces, then device complexity is reduced, but manufacturing precision deteriorates because the same cylinders cannot simultaneously perform both separation functions accurately
Solution Approach 1:
The separation process is divided into two distinct steps: first separating the waste piece from the bag, then separating the bag from the tubular body. This segmentation allows each pair of cylinders to specialize in one separation function, maintaining high precision while reducing overall device complexity compared to using multiple pairs for both functions simultaneously
Solution Approach 2:
The waste piece is separated first as a preliminary action before the main bag separation. This preliminary separation simplifies the subsequent bag separation process and allows the second pair of cylinders to focus solely on the larger bag separation task without the complication of the waste piece interfering
2Productivity
If the separation cylinders rotate at high speed to increase productivity, then production rate improves, but the waste piece turns over and detaches causing jams
Solution Approach 1:
The system uses differential rotation speeds between the two pairs of separation cylinders. The first pair rotates at a lower speed to stabilize and separate the waste piece, while the second pair rotates at a higher speed to separate the bag. This dynamic speed differentiation allows high productivity while preventing waste piece turnover and detachment
Solution Approach 2:
The peripheral speed parameter is varied between the two pairs of cylinders. The first pair operates at a lower peripheral speed to ensure stable waste piece separation, while the second pair operates at a higher peripheral speed for efficient bag separation, optimizing both reliability and productivity
3Manufacturing precision
If multiple pairs of separation cylinders are used to handle both bag separation and waste piece separation, then manufacturing precision improves, but device complexity and machine size increase
Solution Approach 1:
Each pair of separation cylinders is designed to perform its specific separation function with high precision. The first pair specializes in waste piece separation while the second pair specializes in bag separation. This functional specialization achieves high manufacturing precision without requiring additional complex mechanisms, keeping the machine compact
Data Source
AI summary
A method for producing a bag from a tube including transverse lines of perforations delimiting tabs of the future bag, a rear tab of a first bag being opposite a front tab of the second bag following the first. A first step involves separating the first and second bags; a second step involves separating a piece of waste remaining on one of the bags between the two tabs. The first and second steps are carried out between a first pair of separation cylinders and a second pair of cylinders, the piece of waste being clamped between the cylinders of the first pair during the first step in order to be held on the second bag, then clamped and torn off by the second pair during the second step.