Easily solve common quality problems with aluminized films

Easily solve common quality problems with aluminized films

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The appearance requirements of the aluminized film are: the aluminum layer is evenly bright, waterless, cloud; the number of pinholes does not exceed 0.5 / m2; the winding is smooth, the tension is appropriate, no serious stretching and gluten phenomenon. But in actual printing, there will always be such problems, let's take a look.

1. Brown stripes appear on the surface of the film

Reason one: low vacuum

Solution: Clean the aluminum in the vacuum chamber, the evaporation device, the cooling system, the unwinding, the winding device and the guide roller; check the vacuum system; reduce the ambient humidity.

Reason two: the film releases gas

Solution: Pre-drying the film; prolong the vacuuming time.

Reason three: excessive aluminum spray

Solution: Increase the speed of the vehicle; reduce the evaporation boat current; reduce the speed of aluminum delivery.

Reason four: there are impurities in the evaporation boat

Solution: Clean the evaporation boat and the heat shield.

Reason five: evaporation boat aging

Solution: Replace the evaporation boat.

2. When the aluminum is plated, the film has holes:

Reason one: the aluminum in the evaporation boat is too full

Solution: Reduce the speed of aluminum feeding; increase the evaporation boat current.

Reason two: Short circuit between the evaporation boats in the vacuum chamber

Solution: Eliminate the short circuit.

Reason three: Impurity splash in vacuum chamber

Solution: Clean the vacuum chamber wall, send aluminum vapor deposition device, cooling drum, unwinding, winding device and each guide roller.

3. The film appears to be stretched when aluminized

Reason one: the substrate tension is too large

Solution: Adjust the unwinding and take-up tension control system to reduce the tension properly.

Cause two: The cooling system is malfunctioning

Solution: Check the cooling system and troubleshoot.

Reason three: the evaporation boat temperature is too high

Solution: Reduce the heating current of the evaporation boat and increase the speed of the vehicle.

4, the film surface has lines and hair lines

Reason one: the guide roller and the heat shield plate are not clean

Solution: Clean the guide roller and heat shield.

Reason two: uneven thickness of aluminum plating

Solution: Check whether the evaporation device such as the evaporation boat and the aluminum feeder are destroyed; whether the aluminum nozzle is unblocked.

Reason three: improper collection and unwinding tension

Solution: Adjust the tension of the take-up and unwinding to avoid the film shaking in the vacuum chamber.

Reason four: the vacuum in the vacuum indoor cooling system leads to low vacuum

Solution: Check the cooling system and troubleshoot.

5, large-area dealuminization oxidation of the film surface was found during rewinding

Reasons and solutions:

Vacuum indoor cooling system leaks