The general EVA agricultural film adopts multi-layer composite co-extrusion blown film technology. Escalator Sensor And Switch,Main Engine Gearbox Damping Tape,Coupling Rubber Sleeve,Xinda Escalator Two Thicknesses Suzhou FUJI Precision Elevator Co.,Ltd , https://www.profuji.com
Taking the three-layer composite as an example, the Va content is 5 to 9% in the inner layer (shackle), MFR is 0.3 to 1.0 g/10 min; the Va content is 9 to 14% in the middle layer, and MFR is 0.3 to 1.0 g/10 min; The layer (buckle shed) is made of LDPE+LLDPE (or mLLDPE) blend as the skeleton layer support.
For functional films, the outer layer also uses EVa. The content of Va determines the mechanical properties of the agricultural film. The higher the content, the better the mechanical properties, but the processing technology is more difficult to control. For the anti-fog film, the drip performance is the main. In 1996 and 1999, the Agricultural Plastics Products Branch of the Chinese Agricultural Plastics Application Technology Society once applied farmland application tests to different Va content agricultural film. The test data confirmed that the higher the Va content. The better the dripping performance.
However, considering the effect that needs to be achieved and the comprehensive performance of the agricultural film. The content of Va in the middle layer is 9 to 14%, and the content of Va in the inner and outer layers is 4%, which can optimize the performance of the cost.