Nondestructive testing method for sealing degree of cigarette small box package without system errors

Abstract

The invention provides a nondestructive testing method for a sealing degree of a cigarette small box package without system errors. A detection device used in the method for nondestructive detection of the sealing degree of the cigarette small box package comprises a negative pressure generator, a detection box and a computer which are connected in sequence, and the detection box comprises a box body with a storage cavity and a cover plate capable of being opened and closed. The method comprises the steps that a standard mold is placed in the storage cavity, and the storage cavity is covered with the cover plate and kept sealed; rapidly reducing the air pressure in the storage cavity to negative pressure through a negative pressure generator, and recording the change of the air pressure inthe storage cavity in real time to obtain a system calibration curve; opening the cover plate, taking out the standard mold, putting the small cigarette packet boxes into the storage cavity, and closing the cover plate; rapidly reducing the air pressure in the storage cavity to negative pressure, and recording the change of the air pressure in the storage cavity in real time to obtain a cigarettepacket sample detection curve; subtracting the system calibration curve from the cigarette packet sample detection curve to obtain a difference removal curve; and fitting the difference removal curve. According to the detection method provided by the invention, the system error of cigarette packet tightness detection can be effectively eliminated under the condition that the cigarette packet is not damaged.

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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