Seam Tightness Indicator for Sterilization Packaging
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Solution Overview
Problem
Current methods for testing the tightness of sterilization packaging seams using colored dyes are not user-friendly, as they require drop-by-drop liquid introduction, leading to potential pollution and difficulty in liquid removal, due to the dye's penetration efficiency.
Innovation Solution
A container with a rigid or flexible design that stores the testing liquid, allowing it to be released within the packaging upon insertion and welding, facilitating visual evaluation of seam quality without opening the packaging, using a mechanism like a disintegratable capsule or a flexible container with meandered seams to establish hydrostatic pressure for liquid extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drop-by-drop liquid introduction is used for seam tightness testing, then penetration efficiency and detection capability are improved, but ease of operation deteriorates and pollution risk increases
Solution Approach 1:
The packaging is divided into two separate chambers: a first chamber for storing the penetration liquid and a second chamber for receiving and evaluating the liquid. This segmentation allows the liquid to be contained safely during storage and transport, then released controllably during testing, eliminating the need for manual drop-by-drop application while maintaining detection precision.
Solution Approach 2:
The penetration liquid is pre-loaded into the first chamber before the actual testing process. The container is prepared in advance with the testing liquid, and the weakened seam is pre-positioned to allow controlled release. This preliminary preparation eliminates the need for operators to manually handle and apply liquid during testing, improving ease of operation while maintaining detection capability.
2Ease of operation
If open packaging is used for liquid introduction, then access for testing is improved, but pollution of surrounding increases
Solution Approach 1:
The penetration liquid is extracted from the operator's direct handling and placed into a sealed first chamber within the packaging. The liquid is removed from the external environment and confined within the container system, eliminating pollution risk during storage and transport, while still allowing controlled introduction during the testing phase.
Solution Approach 2:
The first chamber acts as an intermediary container that holds the penetration liquid safely during storage and transport. Instead of directly handling liquid droplets, the operator works with a sealed container system. The liquid is transferred through this intermediary structure, eliminating direct contact and pollution risk while maintaining the ability to introduce liquid for testing when needed.
3Difficulty of detecting and measuring
If testing liquid is introduced into open flexible packaging, then direct observation is improved, but difficulty in liquid removal increases
Solution Approach 1:
The packaging is segmented into distinct chambers: the first chamber for liquid storage and the second chamber for observation. This segmentation confines the liquid to specific zones, making it easier to control and remove. The weakened seam between chambers provides a controlled release point, allowing liquid to be contained and evaluated without spreading throughout the entire packaging structure.
Solution Approach 2:
The seam structure is designed with localized different properties: most of the seam is tightly welded to contain and direct liquid flow, while a specific section is weakened to allow controlled passage. This local variation in seam quality enables precise liquid routing - the liquid flows through the weakened section into the second chamber for observation, then can be easily removed from that specific location without affecting the rest of the packaging.
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
Enables efficient and controlled release of the testing liquid within the packaging, reducing pollution risks and simplifying the testing process while ensuring compliance with standards like ISO EN 11607 and ASTM F 1929, allowing for routine quality control of sterilization packaging seams.
Implementation Method 1
colored dye like the fluid TRITON X-100, which is characterized by extremely efficient intruding into pores
Implementation Method 2
the required hydrostatic pressure is easily established in order to discontinue said weakened seam and extract the testing liquid
Data Source
Figure 1~3
Figure 4~7
AI summary
A seal testing system provides an indicator of the tightness of seals in packaging of the seal testing system includes at least partially light permeable thermoplastic film providing two flexible layers that are impermeable for liquid and that are circumferentially sealed to define chambers that store a seal testing fluid and that are interconnected via a narrowed intermediate passage. At least section of a seal between the film layers is weakened to allow release of the seal testing fluid when pressure is introduced in the chambers.