Device for detecting transmissivity of organic matter through plastic film

Abstract

The invention relates to a device for detecting transmissivity of an organic matter through a plastic film. An openable-closable testing room consists of openable-closable upper and lower testing rooms; an upper accommodating chamber is provided with an upper communicating pipe, a lower accommodating chamber is provided with a lower communicating pipe; and the communicating pipe of the upper accommodating chamber is connected with an air temperature and humidity adjusting circulator, and the lower communicating pipe is connected with a nitrogen source and a tester. An organic matter to be tested is coated on one side of the plastic film and is clamped tightly; a testing outer room is controlled at a certain diffusion temperature and in certain humidity; after a certain period of diffusion time, the organic matter permeates the plastic film to enter a testing inner room; the temperature and the humidity of the testing inner room are kept above the smoke point of the organic matter, and inert gas is introduced into the testing inner room continuously and circularly; after thermal desorption and adsorption enrichment, qualitative and quantitative detection is performed; and the circulation is carried out for many times to reach a certain detection concentration lower limit and then a sensor is used for measurement. The device can implement environmental simulation, automatic control and automatic digital acquisition; the device is convenient, safe and reliable, and highly intelligent to greatly improve the detection efficiency; and the automatic operation saves the manpower.

Description

technical field [0001] The invention belongs to a plastic detection device, in particular to a detection device for organic matter transmittance of a plastic film. Background technique [0002] With the rapid development of material science, polymer materials are more and more widely used in food packaging in different forms, but due to the characteristics of polymer materials and their modification processing, many organic compounds permeate plastic films or plastics. Sheets, common organic compounds such as adhesives, coatings, inks, etc., enter food through plastic packaging, which brings great hidden dangers to food safety and endangers people's health. To solve this problem, in Before selecting materials, we must analyze the barrier of polymer materials to certain harmful organic compounds, and consider the impact of the migration process on the use of packaging materials. During the use of materials, harmful organic compounds migrate into the food contained, bringing ...

AI Technical Summary

Problems solved by technology

Some chromatographic headspace sampling methods are used to quantitatively detect the migrated harmful organic substances, but the detection of unidirectional migration of packaging materials cannot be realized, and the performance of the barrier properties of packaging materials on the chemical safety of the contents cannot be truly simulated.

So far, there is still a lack of a detection device and method for quantitatively characterizing the barrier properties of plastic films to organic substances like oxygen and water vapor transmission rate detectors.

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