Plastic extruder can be called the host in the plastic extrusion equipment. Other subsequent mating devices are the assistants. After more than one hundred year’s development, the plastic extruders have changed models from the original Single screw extruder into the modern Conical twin screw extruder, even multi screw extruder.
Plastic extruder machines can be matched with tube material, flat, and sheet material, profile, etc, to compose of a variety of plastic extrusion lines. So from this point, we can find that the plastic extruder will get wide application in the field of plastic processing industry.
Since the viscosity of the molten plastic is temperature dependent, temperature measurement is an important operational guide to extruder operation. Temperature control schemes generally divide the extruder barrel into temperature control zones, with a temperature control loop including a controller, temperature sensor, heater and an over temperature alarm for each zone. Band-type electrical resistance heaters of two piece construction to facilitate removal are generally employed for directly heating the barrel.
Extruders require large heater ratings to decrease heating time. After plastic machinery have begun, however, heat is internally generated from friction, and at high production speeds the internal temperature, if uncontrolled, rises above the accepted maximum. 
Many Plastic Extruder processes extruded by the Plastic Extrusion Lines involve three different heaters which will overall overheating. It is also very interesting that so much friction and pressure builds up the heater which sometimes will be shut off.
After the high temperatures cooling fans are also employed frequently, helping to keep the plastic extrusion cavity at the desired temperature. Now it’s time for the plastic to go into a die. The plastic must be cooled again in the die.
In this Plastic Extrusion Process Plastic sheeting cannot stand the water cooling. As a result cooling rolls are used to gently cool the sheets. The lengthy amount of time and research I put into learning about Plastic Extrusion payed off.
The extrusion process is used every day for us. But no one realizes that all of that is made from extruding plastic. After everything is cooled,you can cut it.And in the end the products what you like is finished , I think you will have a big achievement.
Zhangjiagang Longree Technology (group) Co., Ltd is one of the famous manufacturers of plastic mixing, extrusion, surface decoration and recycling machine.
She is also having a good performance in PVC granulating line , PE/PP film washing line of Washing and recycling, and other like pulverizer , Crusher and other products.