Packaging Material BOPP Cigarette Film Testing
P.R.China, August 12, 2015 (Newswire.com) - BOPP film:
BOPP film is a kind of very important flexible packaging material. BOPP film is a kind of material which is colourless, odourless, tasteless, non-toxic and has high strength, impact strength, rigidity, toughness and good transparency.
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BOPP can compound with a variety of different materials to meet specific application needs. For example BOPP composited with LDPE (CPP), PE, PT, PO, PVA composite has the performances of high resistance, the wet resistance, transparent, high temperature and low temperature resistant, resistant to steam and oil resistance. The composite films can be applied to oily food, dry food, dipping food and all kinds of cooking food, such as monosodium glutamate, pancakes, rice cakes packaging.
BOPP cigarette film:
Barrier property is the key testing item for cigarette film. Relevant tests include water vapor transmission rate testing, oxygen transmission rate testing and organic gas transmission rate testing, all of which directly relate to the moistening, moldiness and flavor protection effect of the cigarette.
1. Water Vapor Transmission Rate Testing
In order to avoid deterioration caused by moistening, higher barrier property against water vapor is required for cigarette packaging. Currently, weighing method and sensor method (including humidity sensor method, Infrared sensor method and electrolytic sensor method) are the two testing methods for water vapor transmission rate testing. Both of those two methods can meet the testing demands for cigarette films. As to testing efficiency, sensor method, especially the electrolytic sensor method, is better.
2. Flavor Protection Testing
Oxygen transmission rate testing is one of the common testing items for BOPP cigarette film. However, oxygen doesn’t have the influence as important as water vapor on cigarette quality. Generally, a comprehensive set of tests both for oxygen and water vapor transmission rates can help determine the flavor protection performance. It’s known that flavor is composed of organic gases. So, the flavor protection properties of different packaging materials should be evaluated based on the organic gas transmission rate testing. Yet, the test is still at its primary stage worldwide. A lack of testing method and instruments has led to the above-mentioned comprehensive test set as a common practice to compare the flavor protection capabilities between materials. Owing to the characteristics of organic gases, including transmission characteristics, which are different remarkably from the inorganic gases, such comparison is lack in accuracy: first, swelling would occur when organic gases transmit through high polymers, and would lead to great changes to barrier properties. Second, size and characteristics of organic gases differ greatly from inorganic gases. The testing methods for organic gases have remarkable differences for those for inorganic gases, among which the biggest difference is that an organic gas generator should be preinstalled inside the instrument for low gas concentration and other characteristics of organic gases. Generally, the influence of swelling towards barrier property can be neglected if the testing
gas concentration at the high concentration side is no higher than 100ppm.
There have been growing testing demands for organic gases in spite of the testing difficulties.
Labthink Instruments has been researching on the method for Barrier property. a series of Transmission Rate Testing Equipments have been developed successfully. This instruments is highly automatic, and convenient to operate. It meets the testing demands for protection, and provides technical support for the drafting of relevant national standards.
For more information，it would be useful for you: Labthink International, Inc.
