Pinhole detection method for sealed package

Abstract

The invention relates to a pinhole detection method for articles which need to be packaged in a sealed mode in food, medical supplies and the like. Conductive materials which are packaged and wrapped by insulation materials are placed under a pair of detection electrodes; one detection electrode is connected with a positive pole of a high-voltage power supply through guide wires, and the other detection electrode is accessed to a current detection device and then is accessed to ground through the guide wires; the two detection electrodes are placed horizontally, and are spaced to each other in a certain distance, and the distance can prevent the two electrodes from being a short circuit caused by high-voltage breakdown air; stainless steel bead chains of the two electrodes contact the packaging surface of the insulation materials of a sealed package; the high-voltage power supply imposes high-voltage electricity on the sealed package through the detection electrodes, and therefore the sealed package is charged; pinhole detection is conducted; and polarity of the two detection electrodes is exchanged, and then the pinhole detection is conducted. The pinhole detection method for the sealed package is capable of achieving high-speed online lossless pinhole detection to sealed packaging products, and therefore small pinholes with a diameter of less than 0.5 micrometer are detected, and accuracy is high.

Description

technical field [0001] The invention relates to a pinhole detection method for food, medical supplies and other items that need to be completely sealed and packaged. Background technique [0002] In the field of food and medical supplies production, vacuum-sealed packaging is mostly used to ensure that the products are kept in a sterilized state. Once pinholes are produced in the sealed packaging, the packaging will come into contact with the air, and the food will rot and deteriorate, seriously affecting its shelf life; medical supplies such as plasma will be contaminated, and even threaten human life. Therefore, it is extremely important to detect pinholes in sealed packages. [0003] At present, there are mainly the following methods for pinhole detection of sealed packaging: [0004] Dyeing liquid method, put the tested package in a container containing colored liquid, pressurize the container, after a period of time, take out the tested package, open the package, and ...

AI Technical Summary

Problems solved by technology

[0007] The above pinhole detection methods for sealed packages are all based on sampling detection of the object to be detected, and are basically destructive detection, which cannot meet the requirements of 100% online nondestructive testing of products on the production line.

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