The process of producing BOPP aluminum plated film
Release time:
2025-01-10
The orientation during the production of BOPP aluminum coated film is mainly in longitudinal and transverse stretching.
In the production of BOPP aluminum plated film, the stretching degree should reach the "inherent stretching multiple", which means that the product of the longitudinal stretching ratio and the transverse stretching ratio of the film should reach about 40. If the longitudinal stretching ratio is insufficient, many thick stripes will appear in the transverse direction of the stretched film; If the horizontal stretching ratio is insufficient, thick stripes will appear on both sides.
The orientation during the production of BOPP aluminum coated film is mainly in longitudinal and transverse stretching. After longitudinal stretching, the polymer chains are oriented in the longitudinal uniaxial direction, greatly improving the longitudinal mechanical properties of the cast sheet, while the transverse properties decrease. After further transverse stretching, the polymer chains are in a biaxial orientation state.
The bopp aluminum coating manufacturer told us that as the degree of molecular chain orientation increases, the number of stretched segments in the film increases, the number of folded segments decreases accordingly, the number of connecting segments between wafers gradually increases, the density and strength of the material increase accordingly, and the elongation at break decreases.
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