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Extruder resin feed

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  • 26/09/2018

The granules of the hopper are placed in the hopper of the extruder, and the hopper is usually located above the screw of the extruder. The size of the hopper is 3. 5 mm, and the bulk density is 560 kg/ Plastic pellets around m3 can generally be stored for 0.5h. The coating and compounding extruder is a full feed, ie the hopper is full and there is a head or level above the screw when the screw is running.As long as the screw of the screw is filled, the height of the column in the hopper has litt…

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Extruder thrust bearing & lubrication system

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  • 25/09/2018

The screw needs to form a pressure at the exit of the coating extruder, which is subjected to equal and opposite axial thrust (indicated by N) equal to the outlet pressure (in Pa) multiplied by the cross-sectional area of the barrel lumen (in m2) . Most extruders for coating and compounding have an outlet pressure of about 10,000 to 20,000 kPa. This pressure is related to the considerable load that the thrust bearing must deal with. This force must be dissipated from the screw to the base structu…

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Coating machine extruder gear reducer

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  • 21/09/2018

Because in the current coating and compounding extruders, the maximum screw speed is 200-300r/min, and the basic output speed of most drives is 1150 or 1750r/min, so the gear reducer must be used to drive the speed. Reduce to the desired screw speed. The total deceleration requirements are achieved with single, double or triple reduction gear sets.The specifications of the gear reducer are designed according to its ability to transmit the output torque of the drive. Each reducer is calculated acc…

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Coating extruder drive type

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  • 20/09/2018

There are many types of coating extruder drives, such as constant speed AC motors, AC motors with eddy current couplings, AC motors with variable speed wheels, AC motors with variable speed converters, hydraulics, hydraulic power units, DC AC motors such as generators, DC thyristors, etc.Constant speed AC motors were used early in the extruder, but have been eliminated due to the inability to shift. The eddy current coupling is a circular drum driven by a constant speed AC motor. Inside the drum …

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Coating extruder drive

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  • 19/09/2018

It is generally expected that due to the high energy conversion efficiency, the transmission energy of the screw friction heat can be completely converted into the temperature rise of the resin. However, due to the large number of operational processes, it is difficult to obtain this result 100%. Extrusion coating and compounding extruders typically require a wide range of operating speeds. The change in speed of the extruder output to the web determines the amount of coating required for the wid…

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Production of coating extrusion extrusion (extruder)

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  • 18/09/2018

The spiral extruder feed funnel accepts thermoplastic polymer resin from the feed system, typically in the form of free-flowing solid pellets (approximately 20 C), in a uniform melt flow (low temperature polyethylene temperature approx. 330 C) drained to the slit die. The resin material is spread over the slit width in the mold and cast as a cover layer or a glue S layer of the composite double web on the traveling web at a thickness of 5-75 um (speed up to 675 m/min).The screw with the spiral …

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