China Plastic Bottles, Pharma Pet Bottles
Pet Bottle Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
Parison reference height is the height of the bottle body height obtained by multiplying the coefficient,the height of the bottle is generally 92%to 95%.In order to ensure good transparency of the bottle,a melt parison mold after filling,the temperature was quickly lowered to less 145℃,but than the glass transition temperature of the polyester material(82℃)higher and closer to the glass temperature,the higher the transparency of blown bottles.Parison mold cooling water temperature up to 10℃~35℃,for rapid cooling of the parison,it will take a liquid or gas to the mandrel continuous cooling,where cool air mandrel can have a more uniform temperature distribution,the air pressure is generally about 1 MP a.2,the melt temperature of the preform during in jecti on The melt temperature is an important parameter PET preform molding to note.From the viewpoint of equipment,screw design have a greater impact on the PET melt,mix and melt temperature.
PET injection to the use of low shear,low compression ratio(about 2/1)of the screw,made longer feed section,at ransition section and a metering section made shorter.Barrel temperature of the device a greater impact on the melt temperature,barrel temperature increase will reduce the intrinsic viscosity of the PET melt.Barreltemperature had a significant effect on the parison transparency,improvecylinder temperature can improve the transparency of the parison.For example,when a barrel temperature of 280℃,the corresponding melt temperature of 290℃,can ensure optimal transparency parison.The barrel temperature increasedoes not improve further transparency.Lower barrel temperatures,anappropriate increase in screw speed to clap gate temperature,small quantitiescan improve the transparency of the parison.However,due to the hot runnersystem melt through time is short,to a lesser extent the temperature of theparison transparency improvement.Increase the injection pressure,i.e.,when the injection rate,the heat generated when high shear melt through the nozzle,the melt temperature is significantly improved.
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