Quality inspection project for clear polyethylene film
Jul 03, 2019
Quality inspection items for clear polyethylene film include film thickness, width inspection, appearance and mechanical properties testing. The width and thickness of the clear polyethylene film are measured according to the standard GB 13735-92, and are measured by a micrometer or a dial gauge. The width is measured by a tape measure, and the dimensional tolerance should meet the standard.
The appearance quality of the clear polyethylene film needs to be observed with the naked eye under sunlight, and the black spots, impurities, crystal points and the size of the dead block on the film surface are compared with the standard sample. Black spots and impurities on the perimeter of the frame should also be counted. According to the standard, the quality level of the product is evaluated.
Followed by the test of the mechanical properties of the clear polyethylene film, the sample is cut on the finished film, the environment of the test chamber is controlled, and the sample is stored in the test laboratory for not less than 4 hours. The width and thickness of the effective portion of the film sample were measured before the test and averaged. The width is required to be accurate to 0.05 mm and the thickness is accurate to 0.001 mm.
The clear polyethylene film was measured for the right angle tear strength, and the thickness of the sample was measured at a right angle, which was accurate to 0.001 mm, and 3 points were measured along the tearing direction, and the arithmetic mean value thereof was taken. At the same time, there is no crack or scratch at the right angle of the sample. The sample is stored in the test chamber for not less than 4 hours. The test speed of the test machine is required to be 200 mm/min; the part of the film when the sample is clamped on the test machine fixture is not more than 22 mm, and the direction of the force of the sample is perpendicular to the direction of the tear; Each sample shall be individually measured for thickness and laminated for testing.www.xmlfilm.com
