Pouch Manufacturing Machine Weld Length Control
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Solution Overview
Problem
Prior machines for manufacturing tobacco pouches cannot ensure that transversal seals have a minimum required length, which is crucial for pouch integrity and quality, as they lack the capability to check and enforce the geometrical properties of the welds.
Innovation Solution
A machine equipped with specific sensor means to detect the length of transversal welds and compare the detected data with predetermined values, ensuring that the welds meet the required length standards, and a control unit to command cutting and reject defective pouches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art machines manufacture pouches without weld length detection, then production speed is maintained, but pouch quality and integrity cannot be ensured
Solution Approach 1:
The sensor means detect the length of transversal welds as they are formed during the welding process, allowing quality verification to occur in advance before pouches leave the production line. This preliminary detection ensures pouch integrity without requiring separate post-production inspection stations.
Solution Approach 2:
The control unit receives data from sensor means about weld lengths and compares it with predetermined minimum lengths. When a weld is insufficient, the system provides feedback by commanding reject means to remove defective pouches, creating a closed-loop quality control system that maintains high reliability.
2Manufacturing precision
If sensor means are added to detect weld lengths, then pouch quality is improved, but manufacturing cost increases
Solution Approach 1:
The sensor means are integrated into the existing packaging machine structure, allowing the same device to perform both welding operations and quality detection functions. The control unit serves multiple purposes by managing both the welding process parameters and the quality inspection logic, reducing the need for entirely separate systems.
Solution Approach 2:
The control unit acts as an intermediary between the sensor means and the reject means, processing sensor data and translating it into appropriate rejection actions. This intermediary layer simplifies the overall system architecture by centralizing control logic rather than requiring direct complex connections between all components.
3Reliability
If all pouches are inspected for weld quality, then product quality is ensured, but productivity decreases
Solution Approach 1:
The sensor means continuously detect weld lengths as pouches move through the production line without interrupting the manufacturing process. The control unit continuously compares detected lengths with minimum requirements, and reject means continuously remove defective pouches, maintaining uninterrupted production flow while ensuring quality.
Solution Approach 2:
The quality inspection system is integrated directly into the production line, allowing the manufacturing process to self-verify and self-correct quality issues in real-time. Defective pouches are automatically rejected without manual intervention, maintaining production speed while ensuring quality standards are met.
Data Source
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AI summary
A machine (100) for manufacturing pouches (1) of cohesionless material comprises: a wrapping station (3) arranged along the packaging path wherein a band of wrapping material is wound to form a tubular element (4); welding means (5) for longitudinally welding the tubular element (4); feeding means (6) for feeding doses of cohesionless material inside the tubular element (4); welding means (7) for transversely welding the tubular element (4); cutting means (9) for transversely cutting the continuous succession (8) at the welding zones (8a) so as to form pouches (1); sensor means (10) arranged downstream of the cutting means (9) to detect the length (L1) of the first transversal weld (1a) and/or the length (L2) of the second transversal weld (1b) of the pouches (1); a control unit (11) which receives the data detected by the sensor means (10) and compares them with a range of predetermined length values of the first weld (1a) and/or of the second weld (1b).