Understanding Plastic Extrusion
The plastic extrusion process starts by placing raw resin into the extruder's hopper. Essential additives for the particular application (such as UV inhibitors, anti-oxidants, or colorants) are then added to the plastic extrusion equipment. Once in cast, the resin is usually gravity-fed through the feed throat of the hopper down into the extruder's barrel. Within the barrel is a long, rotating screw that exerts the resin forward in the barrel to the die.
As the resin moves along within the barrel, it is exposed to enormously high temperatures until it propels to melt. Depending on the type of thermoplastic, barrel temperatures can range between 300~500 degrees Fahrenheit (Equals to 150~260 celcius degree). Once the molten plastic progresses to the end of the barrel, it is forced through a screen pack and fed into the feed pipe that leads to the extrusion die.
The screen, covered by a breaker plate due, serves to get rid of contaminants that may be present in the molten plastic. The corrosity of the screen and other factors can be manipulated until uniform melting occurs as a result of the real amount of back pressure.
After extrusion die, cold extrusion way will directly produce needed profile, then the profile will be cooled through water tank. Hot extrusion way then needs to produce needed profile by calibrator die, among the vacuum and water pipe will help to reach the size and shape of needed profile.
The method may seem to be complex, but we strive for the highest standards of quality control and customer care by continually re-evaluating and upgrading all of our processes.
Constant technical assistance helps our customers achieve their goals!
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