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Application and forming process of PET material

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2021-12-02

PET is mainly used for fibers, and a small amount is used for films and engineering plastics. PET fiber is mainly used in the textile industry. PET film is mainly used for electrical insulation materials, such as capacitors, cable insulation, printed circuit wiring substrate, electrode slot insulation, etc. Another field of application for PET films is film bases and base tapes, such as motion picture films, X-ray films, audio tapes, electronic computer tapes, etc. PET film is also used in vacuum crossing aluminum into metallized film, such as gold and silver wire, micro capacitor film, etc. Another use of PET is blow molding products, used for packaging polyester bottles. Glass fiber reinforced PET is suitable for electronic and electrical and automotive industries, used in various coil frames, transformers, televisions, recorder parts and housings, automotive lamp holders, lampshades, white hot lamp holders, relays, sun rectifiers, etc.

PET molding can be injection molding, extrusion, blow molding, coating, bonding, machining, electroplating, vacuum plating, printing. The following mainly introduces two kinds.

1. Injection molding grade ① Temperature setting: nozzle: 280~295 ℃, front 270~275 ℃, middle forging 265~275 ℃, rear 250-270 ℃; Spiral rod speed 50~100rpm, mold temperature 30~85 ℃, non-crystalline mold 70 ℃, back pressure 5-15KG. ② Try the dehumidification dryer, the temperature of the material pipe is 240~280 ℃, the injection pressure is 500~1400 ℃, the injection molding temperature is 260~280 ℃, the drying temperature is 120~140 ℃, and the required time is 2~5 hours.

2. At the film level, PET resin chips are pre-dried to prevent hydrolysis, and then amorphous thick sheets are extruded through a T-shaped die at 280 ℃ in an extruder, and quenched by a cooling drum or cooling liquid to keep them in an amorphous state for stretching and orientation. The thick sheet is then stretched in both directions by a tenter to form a PET film. Longitudinal stretching is to preheat the thick sheet to 86~87 ℃, and stretch it about 3 times along the plane extension direction of the thick sheet at this temperature, so that the orientation can increase the crystallinity to a higher temperature: the preheating temperature of transverse stretching is 98~100 ℃, the stretching temperature is 100~120 ℃, the stretching ratio is 2.5~4.0, and the heat setting temperature is 230~240 ℃. The film stretched in the vertical and horizontal directions also needs to be heat-set to eliminate the deformation of the film caused by stretching and make a film with better thermal stability.

PET material belongs to the category

PET material characteristics

PET material belongs to the category

PET material characteristics