Overview of vacuum aluminum-plated cast polypropylene film

日期:2019/9/30 9:02:18 / 阅读: / 来源:本站

Overview of vacuum aluminum-plated cast polypropylene film
Vacuum aluminum-plated film to make composite film, compared with aluminum foil composite film, can save aluminum and adhesive, such as composite film of 1t aluminum box as main barrier layer, about 350kg aluminum foil, 200kg polyurethane adhesive, and secondary compound loss. Vacuum aluminum-plated film instead of aluminum foil has been accepted by manufacturers, but vacuum-aluminized film, which is usually based on polyester and biaxially oriented polypropylene, is used as a transparent film on the surface of the composite film. Due to the poor heat sealability of PET and BOPP, the inner layer is also laminated with a heat seal layer. The vacuum-aluminized film CPP of the cast polypropylene itself has heat-sealing property, and the inner layer composite heat-sealing layer can be omitted, and only the transparent layer printed on the surface can be composited once. A three-layer structure such as BOPP printing/AI-VM-PET (or aluminum foil PE or CPP) can be replaced by a BOPP printing/Al-VM-CPP two-layer structure. This saves about 70% aluminum and 50% adhesive.
However, the heat resistance of the CPP film is inferior to that of BOPP, and the temperature above 100 ° C is easily softened. In terms of stretchability, there are problems such as easy elongation, difficulty in winding, easy wrinkling, and breakage under a certain tensile force. The existing vacuum aluminum plating equipment is appropriately modified to control and handle the relationship between evaporating radiation temperature and cooling and traveling speed, and to control and adjust the relationship between the tracking tension of the equipment and the tensile force of the CPP film, effectively preventing the CPP film from being plated. The softening and extension of the cast polypropylene film can also be vacuum aluminized.
The industrialization implementation is as follows: First, the surface of the CPP film is subjected to electric discharge treatment to have a surface tension of 38--40 mN/m, and then the rolled PP film is placed in a vacuum chamber, and the treated surface faces the evaporation source, and thereafter Turn off the vacuum chamber and evacuate. When the degree of vacuum reaches 133.2×10-4 Pa or more, the evaporation source is heated to 1400-1500 ° C, and then the aluminum wire having a purity of 99.9% is continuously sent to the high temperature region of the evaporation source. At this time, adjust the speed and tension of winding, unwinding, adjust the wire feeding speed and evaporation, and open the cooling source so that the cooling temperature is below 25 °C (the colder the better). At this time, the aluminum wire is rapidly and continuously melted and evaporated in the high temperature region, and the aluminum molecules are rapidly bombarded on the surface of the electrospark-treated CP film, and rapidly cooled and recrystallized to form a bright and uniform aluminum metal film with a thickness of about It is 30-50m, and the surface treatment of CPP is much better than BOPP. Then turn off the machine, take out the plated film, cut it according to the specifications, then use it for compounding, make flexible packaging, and seal directly.
The CPP vacuum-aluminized film produced by this method has a thickness of 20-200 μm. It not only has simple process, good brightness, good air tightness and heat sealability, but also has good thermal insulation performance and light and radiation resistance, or it can be directly heat-sealed to make it as a flexible packaging lining material. Widely used in a variety of food packaging, flexible packaging materials, cold storage insulation materials, home appliances shielding and decoration materials.

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