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Work Principle of Styrofoam Densifier Extruder

Styrofoam densifier uses the compressing, heating and shearing methods to convert waste EPS foam into a uniform melt, and the melted EPS blocks are convenient to transport and do the next process. The densified polystyrene production involves crushing the waste EPS foam and hot melt process. Finished melt temperature and the concentration must be uniform. Pressure must be large enough to squeezed viscous polystyrene blocks.

 

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Styrofoam densifier has a screw and barrel with spiral knife to complete all of the above processes. Waste polystyrene foam was put into the barrel at one end of the barrel through a hopper, and then transmitted to the other end of the barrel by the screw. In order to have sufficient pressure, the hopper Examples increases followed as the depth of the screw. Due to the external heating of friction screw, polystyrene foam softens and melts.

 

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Styrofoam densifier usually has at least three segments. First part, near the hopper, is the feeding section. It allows the material into the extruder at relatively steady rate. In general, in order to avoid clogging of the feeding channel, which will remain a relatively low temperature. The second part is the compression section, during the formation of the melt and the pressure increases. Transition that from the feeding section to the sudden compression can also be progressively gentle. The last section is the metering section, close to the extruder outlet. The main function of the extruder is a uniform material. In this divided part, to ensure uniformity of composition and temperature, the material should have sufficient residence time. At the end of the barrel, EPS melted exits the extruder through a die, the die is designed to ideal shape, melted extrusion flow went through here.

 

Another important part is Styrofoam densifier drive mechanism. It controls the speed of rotation of the screw, the rotation speed of the screw determines Styrofoam densifier yield. The power required is determined by the viscosity of the polystyrene. And the viscosity of the polystyrene foam depends on the temperature and flow rate.

 

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Introduction of Styrofoam densifier
At first, Styrofoam densifier has extruder principle: solid conveying, melting, pumping and booster, but is not so simple.

 

As a whole, screw extrusion theory study is still in its initial stage, which is called "art than science" from its study of the extrusion process, probably in three aspects:

 

1, the state variation, transport theory, solid, melt conveying exhaust the truth and the law in the polystyrene foam extrusion process, and established a physical model of mathematics, used to guide the design of Styrofoam densifier extrusion process optimization.

 

2, to figure out two or more polymers and materials during the extrusion process in the real situation, hybrid form, the process of structural change, and the relationship between performance and the final mixture.

 

3, as Styrofoam densifier, the intrinsic link reaction of extrusion molding, speed, performance, and screw configuration, operating condition. To establish the model to guide reaction extrusion molding.