Pouch Leak Detection via Pneumatic Pressure Variation
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Solution Overview
Problem
Existing filling lines for flexible pouches, such as DOYPACK™ stand-up pouches, lack the ability to reliably check for holes in pouch walls and ensure complete opening before filling, leading to potential oxygen leakage and overflow issues.
Innovation Solution
A device and method utilizing a carousel with nozzles connected to a duct for supplying a test fluid, which detects pressure and flow rate variations to identify leaks and incomplete openings, preventing defective pouches from being filled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual inspection is used to check pouches, then the device complexity is low, but the measurement precision and reliability are insufficient to detect holes
Solution Approach 1:
The patent applies pneumatic testing by introducing a test fluid (gas) into the pouch through a nozzle and detecting pressure variations to identify holes or defects. This pneumatic method replaces inadequate visual inspection with a reliable pressure-based detection system that can accurately detect defects in the pouch structure.
Solution Approach 2:
The patent replaces manual visual inspection with an automated pneumatic testing system. The mechanical system includes automated nozzle positioning, test fluid supply, and pressure detection mechanisms that work together to automatically detect defects without human intervention, thereby improving reliability while maintaining manageable device complexity.
2Manufacturing precision
If pouches are checked for complete opening, then filling accuracy improves, but the checking time and productivity are reduced
Solution Approach 1:
The patent performs the opening check as a preliminary action before the filling operation. By introducing test fluid and detecting pressure variations prior to filling, the system identifies pouches with incomplete openings in advance, allowing defective pouches to be rejected before they enter the filling process, thus ensuring filling accuracy without significantly impacting overall productivity.
Solution Approach 2:
The pneumatic testing system operates continuously alongside the pouch conveyance process. The nozzle follows the pouch movement, and pressure detection occurs in real-time during the pouch handling sequence, allowing the checking operation to be integrated into the continuous filling line workflow rather than being a separate batch process.
3Object-affected harmful factors
If no checking system is implemented, then the productivity is high, but harmful factors such as oxygen leakage and product contamination occur
Solution Approach 1:
The patent employs a pneumatic testing system that introduces a test fluid into the pouch and monitors pressure variations to detect holes or defects that would cause oxygen leakage or contamination. This relatively simple pneumatic setup provides effective protection against harmful factors without requiring complex multi-component checking systems.
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 effectively checks for holes and complete opening of pouches, ensuring hermetic containment and preventing product loss or contamination, enhancing the reliability and efficiency of the filling process while maintaining competitive costs.
Implementation Method 1
means for detecting a variation in the pressure and/or flow rate of the test fluid in said at least one duct after the test fluid has been supplied to, or drawn from, said pouch through said at least one duct and said at least one nozzle
Implementation Method 2
said device further comprising first means for actuating the closure of said first valve after the test fluid has been fed or drawn from said supply duct and by means of a relative pressure that is different from zero and is induced by said pressurized line
Data Source
AI summary
A device for checking pouches adapted to contain a substance such as a liquid, a powder or a purée, includes at least one carousel adapted to convey the pouches, supporting them along its peripheral region, and at least one duct for supplying a test fluid that is connected to at least one nozzle insertable in a respective pouch conveyed by the carousel. The device further includes elements for detecting a variation in the pressure and/or flow rate of the test fluid in the supply duct after the test fluid has been supplied to, or drawn from, the pouch through the duct and the nozzle.