Sell pet bottle preform of hot runner molding technology @China (Mainland)

PET bottle technolgy most used in PET preform mould.preform mould with hot runner also called hot runner for PET mould.Valve gate type hot runner for PET mould is Anole hot runner key products.

During Bottle preform forming process,the best condition is using the lowest temperature,as low as possible in the shortest possible time to rapidly and evenly and completely melted.And the related process conditions as follows:
 
Temperature:Forming temperature is the charging barrel and the hot runner temperature.When forming,only 30% heat are from external heating,70% are from internal friction heat,so in addition to proper heating outside,good shear heat also is very important.

injection and pressurize
Injection is to overcome the resistance of the port,will make the melt material to fill into the mould.For bottle preform,it had better have three sections of speed and pressure,which in turn is degressive.

The pressure has two important role:to prevent the melt flow back and ensure material under pressure cooling (enhance cooling effect).Too much pressure can cause filling overdose and bilge mould and so on.The internal stress will be higher,it is still possible to crystallization.Too low pressure will cause shrink,bottle preform deformation (cooling not enough),gate problems such as pinhole,bubbles.The holding time also need to be right,too short can also cause the pinhole,wire drawing,etc.

Release the pressure
Relaese pressure is to reduce the hot runner inside pressure,prevent the gate jams,needle valve action not flexible,and etc.But too will cause shrink,brushing,pinhole,etc

Back pressure
Back pressure is in the motor oil drive screw rotation process hydraulic system through the screw to melt material on hold together.

Buffer zone
Buffer is the surplus of the injection screw after injection.Too little will cause bad shape,too much can cause PET decomposition.General small to big,slowly from less move,make the bottle preform not hair mist or crystallization in the quantity to be appropriate.

cooling
PET is opaque, and bottle preform are transparent.Bad cooling will reduce bottle preform cooling rate,will lead to shrink and bottle preform deformation and affect the circulation time.To avoid this situation:water treatment,regular cleaning waterway,check the flow of water and water pressure,cores and cavity unpick and wash,etc.

If you are interested in our product,welcome to make consulation.Anole hot runner PET preform mould hot runner

Written by Tina
skype:anole-01
service1003@anole-hot-runner.com
www.anole-hot-runner.com

Post by Emily Tina    Rubber & Plastics    @2012-07-27 17:28:30