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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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Groove roll coater and web dryer

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  • 17/09/2018

When the extruded polymer is combined with several substrates (such as film, aluminum foil, cellophane, and high-size paper or paperboard) in the nip of the composite device, a may not be very satisfactory. Therefore, a primer chemical is applied by a gravure coater (Fig. 156) consisting of a tray, an electric gravure roll and a glue roll. The groove of the gravure roll draws the primer from the tray and applies the primer to the surface of the substrate such that the surface is ready to adhere t…

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Extrusion coating definition

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  • 14/09/2018

Extrusion coating is defined as the casting of a molten polymer as a composite double web (the two webs are bonded together in a nip consisting of a hanging roll and a chill roll) to the cover layer or adhesive layer. On a moving web or substrate. The base material sheet to which the polymer is applied is then rolled into a cylindrical form. Which substrate can be used in the extrusion coating and compounding (or lamination) process? Table 50 lists a number of such substrates, as well as their t…

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