Water vapor permeability tester adopting weight-reducing method

Abstract

The invention relates to a water vapor permeability tester adopting a weight-reducing method. The water vapor permeability tester mainly comprises a processor, a storage, a display terminal and at least one independent test unit, wherein the processor is connected with the storage and the display terminal respectively; each independent test unit comprises a test cavity, a cavity cover and a heating device; the heating devices are used for heating the test cavities; the bottoms of the test cavities are provided with weighing sensors which are connected with the processor; moisture permeation cups are arranged on the weighing sensors; the moisture permeation cups are filled with water; rims of the moisture permeation cups are covered with test samples; the inner walls of the test cavities are provided with temperature-humidity sensors which are connected with the processor; drying agents are arranged above the moisture permeation cups. The water vapor permeability tester is simple in structure and is easy and convenient to operate, simultaneous test of a plurality of independent test units can be realized, and the coat is saved; a temperature and humidity in the test cavities and the weights of the moisture permeation cups can be acquired in real time, the test accuracy is increased, and an error influence on a test result caused by temperature-humidity control accuracy is lowered.

Description

technical field [0001] The invention relates to the technical field of barrier property detection, in particular to a water vapor transmission rate measuring instrument by weight reduction method. Background technique [0002] Food and medicine are commodities that are closely related to people's health. The packaging of such commodities not only requires beautiful appearance, convenience and practicality, but more importantly, ensures that the contents have stable and reliable quality during the shelf life to prevent moisture absorption, Decomposition and deterioration caused by air leakage and light. Therefore, the selection of packaging with barrier function is the key to ensure the safety of food and medicine. The barrier property of packaging materials is for specific permeable objects, including common gases, water vapor, liquids, organic substances, etc. Concentration side permeates through the material into the lower concentration side) barrier properties. In a na...

AI Technical Summary

Problems solved by technology

The humidity in the test chamber should be kept below 10%, so that a humidity difference of about 90% can be formed inside and outside the moisture permeable cup. However, in order to meet the national standard, the existing moisture permeability meter is equipped with a flowing 90% humidity in the test chamber. Pass, so that there will be no humidity difference between the inside and outside of the moisture-permeable cup, and the test results are prone to errors

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