echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Active Ingredient News > Drugs Articles > How to see the effect of temperature and humidity on the passing rate of water vapor?

    How to see the effect of temperature and humidity on the passing rate of water vapor?

    • Last Update: 2020-11-09
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    First of all, temperature and humidity are important factors that affect the gas barrier performance of packaging materials.
    This paper analyzes the effect of temperature and humidity on the moisture resistance of the sample by testing the water vapor pass rate of the black and white membrane sample under different temperature and humidity conditions, and introduces the test principle, equipment parameters and applicable scope, so as to provide reference for the testing and analysis of the water vapor pass rate of the packaging material under different conditions.
    keywords: temperature, humidity, water vapor pass rate, moisture resistance performance, water vapor pass rate test system, cup method, weighing method, weight gain method, weight reduction method 1, meaning According to the specific use of different indicators, the index of material barrier performance is divided into oxygen, water vapor, nitrogen, carbon dioxide, air and other different gases barrier performance, with the corresponding gas pass rate.
    In the process of testing the barrier performance, the test temperature and humidity are two important test parameters, the change of temperature and humidity will affect the internal structure of the material, the motion ability of the gas molecules and other factors, especially in the process of testing the water vapor penetration capacity, the test humidity is the water vapor penetration on both sides of the packaging material dynamic conditions, therefore, the temperature and humidity conditions are different, the gas penetration rate in the packaging material is different.
    the effect of temperature and humidity on barrier performance can provide data reference for packaging materials in different storage environments to produce good shelf life.
    2, test sample This test with black and white film for milk packaging as the test sample, respectively, tested its water vapor pass rate under the three test conditions of 23 degrees C, 90%RH, 38 degrees C, 70% RH and 38 degrees C, 90% RH.
    3, the test according to the film material water vapor transmission rate test principles include cup method, infrared method and electrolysis method, etc. , this paper uses cup method to test, the test process is based on GB 1037-1988 "plastic film and sheet water permeable vapor test method cup method."
    4, test equipment this paper using W501 water vapor pass rate test system to test the sample, the equipment by Guangzhou Standard Packaging Equipment Co., Ltd. independent research and development and production.
    weighing method water vapor pass rate meter W501 test principle cup method principle, also known as weighing method, as the name implies is based on the quality change of the permeable cup to get the sample of water vapor transmission rate.
    According to the quality change of the permeable cup, the principle is divided into weight gain method and weight loss method, both methods are by the sample is clamped in the permeable cup so that the inside of the permeable cup separated from the external environment, the difference is that the weight gain method permeable cup is placed in the desiccant, the weight reduction method permeable cup is filled with a certain amount of distilled water.
    Meging the humidity in the test cavity by controlling the equipment, there is a difference in humidity between the test cavity and the wetting cup (the test cavity in the weight gain method is the high wet side, the weight reduction test cavity is the low wet side), and the water vapor penetrates from the high humidity side through the sample to the low wet side, increasing The weight of the permeable cup in the heavy method increases, the weight reduction method is the opposite, because the weight loss of water vapor is reduced, according to the monitoring of the quality of the permeable cup with the permeability time change, we can get the amount of water vapor permeable per unit area test, that is, the water vapor transmission rate.
    5, the test process This test is carried out by weight-gaining method.
    (1) trim 3 samples with a diameter of 74 mm from the surface of the black-and-white membrane sample to be tested.
    (2) Add a certain amount of active desiccant to 3 permeable cups, then place the seals, samples, washers, and tighten the lid.
    note that the desiccant does not come into contact with the sample.
    the wetting cup with the test is clamped into the wetting cup holder in the equipment test cavity and close the test cavity cover.
    (3) Select the "weight gain method" mode on the control software of the device, set the sample name, test temperature (23 degrees C), humidity (90%RH) and other parameter information, click on the test option, the test begins.
    equipment is automatically intermittently weighed according to the set parameters and the test results are displayed at the end.
    (4) Test the water vapor pass rate of the sample at 38 degrees C, 70% RH and 38 degrees C, and 90% RH in accordance with the above steps.
    6 and the test results were taken as the arithmetic average of the test results of 3 samples under each test condition as the water vapor passing rate of the sample under the test conditions.
    black and white membrane samples were measured at 23 degrees C, 90%RH, 38 degrees C, 70% RH and 38 degrees C, 90% RH under the three test conditions of water vapor pass rate of 1.9 5674 g/(m 2,24h), 2.6073 g/(m 2,24h), 4.1037 g/(m 2,24h).
    At the same time, Guangzhou Standard International currently produces and sells more than 100 detectors, involving packaging materials barrier performance detection, thickness detection, physical mechanical performance testing, packaging container sealing performance testing and so on.
    since its establishment, the company adhering to the "customer-centric" service concept, has more than 10,000 scientific research institutions, third-party testing institutions and enterprise quality control departments to provide a comprehensive, professional, accurate packaging product quality control solutions to help customers from the risk control, improve enterprise quality and safety awareness, reduce the loss of enterprise costs.
     
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.