Posts Tagged ‘BOPP’
BOPP and BOPP Film Testing
BOPP testing is very important for BOPP quality control. BOPP(Biaxially Oriented Polypropylene) cigarette film, with is excellent moisture barrier property, optical performances, heat seal property as well as high heat seal strength, reasonable shrinkage rate and good stiffness, is the first choice for cigarette film. The testing items of BOPP are the judgment for BOOP film performance. In order to better control the quality of BOPP cigarette film, Labthink, integrates the testing demand and introduces the relevant BOPP cigarette film testing methods and items, so as to bring useful helps for the cigarette companies.
A. Moisture Barrier Property Testing of BOPP Cigarette Film High moisture barrier property performance is a must for cigarette package so as to avoid deterioration caused by moisture. At present, this factor is not fully noticed by the cigarette manufacturers. Labthink PARAM TSY-T1H is developed according to ASTM E96, ISO 2528 and other standards to test moisture transmission rate for materials. The lower WVTR the better. But, higher barrier property means more costs. Therefore, the common data is less than 10g/m2.day or 5g/m2.day.
B. Thickness of BOPP
Thickness of BOPP cigarette film is the basic film performance index. Uneven thickness would influence the tensile strength and permeability as well as the following procedures. Thicker cigarette film would have better stiffness with better visual performance. But, the cost would also be great. In order to find the balanced solution, high precision thickness tester is needed. Labthink PARAM CHY-C2 is the lab thickness tester with the precision up to 0.1um. When testing thickness in different directions, deviation must be controlled within 3% usually. Meanwhile, the edge thickness of BOPP film has to be measured.
C. BOPP Cigarette Film Tensile Strength, Elongation and Elastic Modulus Cigarette package requires high tensile strength of BOPP films, which can greatly reduce the breakage during packaging process. Generally, 140N/mm2 vertically and 200N/mm2 crosswise are required. Elongation rate is for analysis of incision easiness of films. Cigarette packaging industry is different from other industries. Higher elongation rate is not better. Max. limitations of 200% vertically and 80% crosswise can guarantee easy incision and assembling smoothness.