Non-destructive Seal Testing for Cigarette Packets
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Solution Overview
Problem
Existing methods for determining the seal of cigarette packets are either destructive, unsuitable for hard packets, or lack high accuracy, leading to issues like mildew, dry cracking, and aroma leakage.
Innovation Solution
A non-destructive method using Darcy's law, Fick's law of diffusion, and kinetic molecular theory to analyze pressure changes in an airtight chamber, providing indicators for effective air permeability, diffusion coefficient, and leakage area of the cigarette packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inflation method is used to test seal, then detection capability is improved, but the method is destructive and cannot be applied to hard packets
Solution Approach 1:
The patent replaces the mechanical inflation method with a pressure differential measurement system that uses sensors to detect pressure changes inside the packet without requiring physical inflation. This substitution allows non-destructive testing of hard packets while maintaining seal detection capability
Solution Approach 2:
The patent introduces a pressure sensor as an intermediary element that indirectly measures seal quality by detecting pressure changes within the packet, rather than directly inflating the packet. This intermediary approach enables non-destructive testing while preserving the packet for further use
2Measurement precision
If punching and positioning method is used, then leak location can be identified, but the method is destructive and packets cannot be recycled
Solution Approach 1:
The patent replaces mechanical punching and positioning with an electronic pressure sensing system that identifies leak locations through pressure differential measurements. This substitution eliminates physical damage to packets while maintaining the ability to locate leaks, enabling packet recycling
Solution Approach 2:
The patent creates a digital model of the packet's pressure distribution to identify leak locations, replacing the need for physical marking or punching. This virtual copying approach preserves the packet's integrity while providing precise leak location information
3Measurement precision
If constant flow rate evacuation is used, then pressure measurement can be performed, but the method may damage the packet film and affect measurement accuracy
Solution Approach 1:
The patent applies partial evacuation (reducing pressure to a controlled extent) rather than complete vacuum evacuation, achieving sufficient pressure differential for accurate measurement without subjecting the packet film to excessive stress that could cause damage
Solution Approach 2:
The patent uses dynamic pressure adjustment and real-time monitoring to optimize the evacuation process, stopping before the packet film reaches its damage threshold while maintaining adequate pressure differential for accurate seal measurement
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 method allows for non-destructive testing of cigarette packet seals, improving test accuracy and reducing sample preparation time, while providing physical indicators that reflect the seal quality.
Implementation Method 1
using a balance chamber to make the airtight chamber quickly form a stable negative pressure
Implementation Method 2
Fick's law of diffusion of gas in the presence of a concentration gradient
Implementation Method 3
By means of Darcy's law which reflects the basic law of pressure difference and flow velocity in porous media
Data Source
Figure 1~2
Figure 3a~3b
Figure 3c
AI summary
The application proposes a non-destructive testing method for the sealing degree of the small cigarette box packaging, which includes placing the small cigarette box to be tested in an airtight chamber, using a balance cabin to quickly form a stable negative pressure in the airtight chamber; The pressure change of the sealed chamber is continuously measured until equilibrium, and the data model is analyzed and established by using Darcy's law, Fick's diffusion law and the physical process of molecular kinetic theory. Through the non-destructive testing method for the sealing degree of the small cigarette box packaging of the present invention, the traditional destructive measurement (damaged small box packaging) for measuring the sealing degree of cigarette small box is changed into non-destructive testing; The test results have specific physical meaning; The test time of a single sample is reduced to 1/5 of the time of destructive test.