Manufacturing method of modified PET tangle film
A manufacturing method and modification technology, which is applied in the manufacturing field of modified PET twisted film, can solve problems such as small temperature range and difficult adjustment of production process parameters, and achieve good oil resistance and fragrance retention, good food hygiene and stable storage good sex effect
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Embodiment 1
[0020] Polyethylene glycol-1,4-cyclohexanedimethanol terephthalate with an average molecular weight of 45,000 and a molar ratio of ethylenedioxy to 1,4-cyclohexanedimethoxy in the polymer is 1.52:1 , 145 kg of polymer and 5 kg of silica blocking agent were stirred and mixed on a mixer for 15 minutes, and then sent to a dew point dehumidification dryer for drying. The drying temperature was 50-60 ° C, and the dew point was lower than -40 ° C. The drying time 6 hours to reduce the moisture content of raw materials to below 400ppm. Send the dried raw materials to the conveying tank. The tank should be isolated from the outside world to ensure that the material will not absorb moisture in the tank. The raw materials in the material tank are accurately measured by a weight loss scale, and are stably added to a twin-screw extruder with a length-to-diameter ratio of 35 times, and are melted and mixed at 260 ° C. The material is sent to a T-die head at 260°C for extrusion, and cast i...
Embodiment 2
[0023] The molar ratio of ethylenedioxy and neopentyldioxy in the polymer is 1.8: 1, and polyethylene terephthalate-ethylene glycol-neopentyl glycol with an average molecular weight of 42000 is used to mix 145 kg of polymer with 5 kg The silicon dioxide anti-blocking agent is stirred and mixed on the mixer for 15 minutes, and then sent to the dew point dehumidification dryer for drying. The drying temperature is 50-60°C, the dew point is lower than -40°C, and the drying time is 6 hours, so that the moisture content of the raw materials is lower than 400ppm. Send the dried raw materials to the conveying tank. The tank should be isolated from the outside world to ensure that the material will not absorb moisture in the tank. The raw materials in the material tank are accurately measured by a weight loss scale, and are stably added to a twin-screw extruder with a length-to-diameter ratio of 35 times, and are melted and mixed at 260 ° C. The material is sent to a T-die head at 26...
Embodiment 3
[0026]Polyethylene terephthalate-1,4-cyclohexanedicarboxylate with an average molecular weight of 45,000 and a molar ratio of terephthaloyl to 1,4-cyclohexanedicarboxylate in the polymer is 2.2:1 , 145 kg of polymer and 5 kg of silica blocking agent were stirred and mixed on a mixer for 15 minutes, and then sent to a dew point dehumidification dryer for drying. The drying temperature was 50-60 ° C, and the dew point was lower than -40 ° C. The drying time 6 hours to make the moisture content of the raw material lower than 400ppm. Send the dried raw materials to the conveying tank. The tank should be isolated from the outside world to ensure that the material will not absorb moisture in the tank. The raw materials in the material tank are accurately measured by a weight loss scale, and are stably added to a twin-screw extruder with a length-to-diameter ratio of 35 times, and are melted and mixed at 260 ° C. The material is sent to a T-die head at 260°C for extrusion, and cast ...
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