Non-destructive testing method for airtightness of small cigarette packs to eliminate systematic errors

Abstract

The invention provides a method for non-destructively testing the airtightness of small cigarette pack packages. The testing device used includes a sequentially connected negative pressure generator, a testing box and a computer. The testing box includes a box body with a storage cavity and an openable and closable cover plate. The method includes: placing a standard mold in the storage cavity, covering it with a cover plate and keeping it sealed; quickly reducing the air pressure in the storage cavity to negative pressure through a negative pressure generator, and recording the air pressure in the storage cavity in real time Change to obtain the system calibration curve; open the cover to take out the standard mold, put the small cigarette pack into the storage cavity and close the cover; quickly reduce the air pressure in the storage cavity to negative pressure, and record the real-time The air pressure change of the cigarette bale sample is obtained; the system calibration curve is subtracted from the cigarette bale sample detection curve to obtain a subtraction curve; and the subtraction curve is fitted. The detection method according to the invention can effectively eliminate the systematic error of the detection of the sealing degree of the cigarette small box without damaging the cigarette package.

Description

technical field [0001] The invention relates to the technical field of cigarette package inspection, and more particularly relates to a method for non-destructive inspection of the airtightness of small cigarette packs that eliminates systematic errors. Background technique [0002] Cigarette packaging is the last link in the production of finished cigarettes, and the tightness of small cigarette packaging has an important impact on the quality of cigarettes. Accurate detection of the airtightness of small cigarette packs is not only the premise to ensure the interests of consumers, but also the premise to guide cigarette manufacturers to improve cigarette packaging technology and improve the quality of cigarette products. [0003] Chinese patent (publication number: CN 104792470 A) discloses a method for measuring the airtightness of small cigarette packs. The method is based on pressure sensing to detect the airtightness of cigarette packs, and can identify the position of...

AI Technical Summary

Problems solved by technology

Although this detection method is a non-destructive detection method, it has two significant defects. One is that the detection index of the sealing degree of the transparent paper of the cigarette package is the change rate of the external pressure of the cigarette pack. This physical quantity is quite different for different cigarette packs. Second, in the process of achieving the pressure balance inside and outside the cigarette pack, due to the sealing of the system, the dead volume of the negative pressure device and the pipeline, a large system error will be generated, and this method does not propose a method to eliminate the system error

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