Serrated Bag Registration via Pneumatic Tab Detection
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Solution Overview
Problem
Existing methods for registering serrated bags, such as using pre-printed registration marks or 'speed bump' devices, are inefficient and unreliable, especially when dealing with patch bags, as they require additional operations and can generate false signals due to the raised patch configuration.
Innovation Solution
A system and method that uses a stream of air to detect and register serrated bags by projecting air on each bag as it passes a predetermined location, utilizing a tab integrated into the bag to create a detectable pressure drop or raise, allowing for accurate separation of bags without relying on pre-printed marks or lever arm displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-printed registration marks are used on each bag, then bag registration can be achieved, but additional manufacturing operations and costs are required
Solution Approach 1:
The invention extracts the registration function from the printed mark system and relocates it to a physical structural feature (the tab). By removing the need for printed registration marks, the system eliminates the additional printing operation while maintaining accurate bag registration through the air stream detection of the tab's physical presence and movement.
Solution Approach 2:
The invention replaces the optical/mechanical print mark detection system with a pneumatic detection system. Instead of using visual or mechanical sensors to detect printed marks, the system uses a stream of air that interacts with the physical tab structure, converting the detection mechanism from optical/mechanical to pneumatic while achieving the same registration function.
2Measurement precision
If speed bump devices with lever arms are used to detect seals, then bag registration is possible, but the system generates false signals with patch bags
Solution Approach 1:
The invention introduces an intermediary element (the tab) that mediates between the seal and the air stream detection system. The tab serves as a consistent, identifiable feature that represents the seal's position without being the seal itself, allowing the air stream to detect bag position reliably regardless of variations in seal configuration or patch bag structures.
Solution Approach 2:
The invention replaces the mechanical lever arm detection system with a pneumatic detection system using a stream of air. The air stream interacts with the tab to detect bag position, eliminating the mechanical contact and false signals associated with lever arm systems while maintaining detection accuracy through pneumatic pressure changes or air flow disruption caused by the tab's presence and movement.
3Loss of information
If printed registration marks are applied on site, then bag identification is possible, but process time and efficiency are reduced
Solution Approach 1:
The registration feature (tab) is built into the bag structure during the initial bag formation process, before the bags reach the registration detection point. This preliminary incorporation of the registration feature eliminates the need for on-site printing or additional marking operations, allowing bags to be registered immediately upon detection by the air stream system and maintaining high production speed.
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
This approach enables reliable registration of serrated bags, including patch bags, by accurately sensing the tab's presence, thereby improving manufacturing efficiency and reducing costs by eliminating the need for pre-printed marks and complex sensor configurations.
Implementation Method 1
A device for projecting a stream of air on each bag as the web passes a predetermined location
Data Source
AI summary
A system for detecting and registering serrated bags includes a web including a plurality of bags connected in an end-to-end arrangement, each bag including a first and second side, a first and second longitudinal end, a transverse seal, a serration disposed transversely across the bag, and a tab integrally connected to the bag at a portion of but less than the entire extent of the tab; a device for projecting a stream of air on each bag as the web passes a predetermined location; and a first and a second pair of nip rolls, each disposed downstream of the device, and adapted to accommodate the web, and to drive at different speeds such that a lead bag is separated from the web.