The 1st Corporate Partner of WPO (World Packaging Organization) Labthlnk* I Three cells Permeation WVTR Testing instruments
Open the catalog to page 13. Test principle and standards 6. Brief operation instruction
Open the catalog to page 2fafijl The 1st Corporate Partner of WPO (World Packaging Organization) Basic knowledge www.labthink.com
Open the catalog to page 3labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) In brief, barrier property of materials refers to the barrier performance of material against permeation substances. Barrier property of packaging means the capability of package that prevents specified permeable substance transmitting from one side to the other (from high to low), such as gases, moisture, flavor, etc. and protects contents from degradation in quality or function loss. Inverse, when we say a material or package has a particular gas permeability it gives us an idea about the amount of gas molecules that...
Open the catalog to page 4Basic knowledge At molecular level, plastic materials are formed by a long polymer chains, as known as “molecular ball”. These ball-like chains present voids, where other molecules may pass through the packaging’s material. Obviously, these voids are not so big, so they will let more easily the little molecules pass, such as oxygen, water vapor, etc. Higher molecules, such as those forming scents, will diffuse with more difficulties through the polymer’s structure. This image shows a rendering (gray and pink) of the molecular structure of a po
Open the catalog to page 5labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) Sorption Desorption From microscopic view, the permeation process includes the following steps as shown in the above figure: a. Gas molecules reach the film surface and accumulate; b. Solution into the film takes place; c. Gas molecules diffuse toward the low concentration side; Permeation is described in terms of a ‘‘solution-diffusion’’ mechanism.
Open the catalog to page 6The 1st Corporate Partner of WPO (World Packaging Organization) Application www.labthink.com
Open the catalog to page 7Application www.labthink.com
Open the catalog to page 8labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) A critical function of flexible packaging is to keep moisture sensitive products in a moisture-free environment (dry condition) such as potato chips, cookies, medicines, etc. or keep humid products in a humid condition e.g., cheese, moisture mask, etc. Without protective packaging, products would quickly gain or lose moisture until reaching equilibrium with the environmental relative humidity around them, therefore result in products degradation in quality or total function loss. Keep them in a moisture-free environment...
Open the catalog to page 9labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) Fresh foods such as vegetable and fruit require that their packages shall have certain degree of water vapor permeation to support their normal breathing. Cling films are required to measure water vapor transmission rate (WVTR).
Open the catalog to page 10labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) In pharmaceutical industry, PTP (Press Through Packaging) and blister packaging are used for packing medicines such as tablet, pills, capsule and so on because of its stable and easy-carrying characteristics. As medicines are very sensitive with water vapor, and mildew or deliquescence problem may happen if packaging materials don’t have excellent barrier property. Therefore, the WVTR of medicines packaging materials should be determined strictly. High barrier material of water vapor
Open the catalog to page 11The 1st Corporate Partner of WPO (World Packaging Organization) WVTR is also important to the textile industry. For example, there are more and more outdoor clothes which are made of waterproof but moisture permeable textiles. In this case, textile manufacturers keep developing new technology and need to determine the WVTR of their textiles. Waterproof but moisture permeable textile
Open the catalog to page 12labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) In building field, water and water vapor are main factors that affecting building quality. In the early days, the permeation from outside is the key object of prevention for building waterproof system. The traditional way is to cover the insulating layer by an airtight and waterproof layer. Although this could prevent outside moisture from permeating, the moisture inside building couldn’t go outside as well. Later, building industry develops new materials with both waterproof and moisture-permeable properties.
Open the catalog to page 13labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) In order to maintain the optimal working status of solar battery, the WVTR of solar panel back sheet shall be determined, as it is one of the critical indexes indicating the performance of solar panel back sheet. If the water vapor barrier property is poor, moisture in the air, especially in rainy or cloudy weather, may penetrate through the back sheet, affecting solar panel’ performance greatly and shortening its service life. Back sheet of solar panel High barrier material of water vapor
Open the catalog to page 14The 1st Corporate Partner of WPO (World Packaging Organization) OLED is widely used in flat panel display, backlight units, and lighting industry with its excellent display performance. Life span of OLED can be severely affected by the moisture in the air as it is sensitive to humidity. Therefore, WVTR is one of the most importance testing items for increasing OLED’s life span. Organic light emitting devices (OLED) Ultra-high barrier material of water vapor
Open the catalog to page 15The 1st Corporate Partner of WPO (World Packaging Organization) Under high temperature and humidity condition (85°C, 85%RH) , its lifetime should be 25 years.
Open the catalog to page 16labthlnk* SThe 1st Corporate Partner of WPO (World Packaging Organization) With the wide application of OLED, the manufacturers have new requirement on the sensibility of the electrolytic tester. It is said, if the WVTR is less than 10-5g/m2*day the lifetime of OLED will be longer 1 year, after that the inner components will be damaged gradually. The OLED industry is trying to develop new materials whose WVTR is less than 10-6 g/m2*day ~ 10-7 g/m2*day
Open the catalog to page 173 Pages
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