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What is the surface tension index of the aluminized surface of the aluminized film?

The surface tension index of the aluminized surface of the aluminized film is as follows: BB/T0030–2004RequireVMBOPETThe wetting tension of the aluminized surface should be greater than or equal to38mN/m,VMBOPP,VMCPPThe wetting tension of the aluminized surface should be greater than or equal to36mN/m.However, it is stipulated in the enterprise standards of aluminum plating manufacturers.VMBOPETThe wetting tension of the aluminized surface should be greater than or equal to48mN/m,VMBOPP,VMCPPThe wetting tension of the aluminized surface should be greater than or equal to38mN/m.Detection in practical applicationVMBOPETMost of the wetting tension of the aluminized surface can reach48mN/m,andVMCPPIt can still be maintained in the first half month of production38mN/maround, but the wetting tension will drop to insufficient with the extension of the storage time.35mN/m, which will cause the initial viscosity of the water-based adhesive to be very low after compounding, and at the same time, a large number of white spots will appear, which can only be improved by curing strength, and most of the white spots will disappear.

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