Unit Type Hot Water Circulation Unit

Product Information

Unit Type Hot Water Circulation Unit

Developed by extruder manufacturer for extruders

NUT・NST Series

Features

1.Stable Extrusion

Stabilizing the temperature of cylinder and screw is essential to suppress variations in the throughput.

In order to make it less likely to be affected by the shear heat generation of rubber and resin, we have devised to eliminate the temperature difference between the inlet and outlet of the cylinder or screw by increasing the flow rate optimizing the pump and piping size.

Temperature Variation Measurement Graph

(Extruder: 90 mm Vent-type Extruder L/D=16, Measurement : Front Cylinder return water temperature, Temperature setting: 50 ̊C)

Note: The measurement result varies depending ot extruder size, setting and material.

Temperature change in long run (Screw rotation: 10 rpm fixed)

(Temperature stability: Set temperature 50 ̊C -0.5 ̊C～+0.3 ̊C）
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Temperature stability depending on screw totation

①10rpm：49.7～50.6℃　②25rpm：50.0～50.7℃　③30rpm：49.8～50.9℃

④40rpm：50.0～50.8℃　⑤Emptying：49.6～50.5℃

⑥10rpm：49.5～50.3℃　⑦25rpm：49.6～50.3℃
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2.Temperature controller

RKC FZ-400 series is the standard temperature controller, but it can be changed to the same model used currently by customer, so it is not necessary to have spare part for this unit.

Also, by changing to a temperature controller with communication function, remote operation can be performed on the touch panel of the operation panel even if a hot water circulation unit is installed on the back side of device due to layout restriction, and batch temperature setting can be made from the recipe management screen. They lead to improvement of workability.

3.Operability

In consideration of operability, the temperature control ON/OFF switch, temperature setting and bleeding switch before operation are located on the front panel.

(image on the right: NST series operation panel)

4.Maintainability

Since the drainage port of the device body is provided on the bottom of the hot water tank, the heat medium can be completely discharged together with the impurities by using air purge together.

In addition, since each circuit is an independent unit type, even in the unlikely event of a failure, you can replace it with a spare unit and send it back to us for repair without stopping production.

5.High Temperature Model Available

The general-purpose type NUT series has a maximum heating temperature of up to 95 ̊C, but we also have the NST series with a maximum heating temperature of 120 ̊C for use with fluoro rubber and materials mixed with resin compounds.

The NST series is equipped with a switch for switching between direct cooling and indirect cooling. Even during direct cooling, if the temperature of the heating medium exceeds 95 ̊C, it automatically switches to indirect cooling.

6.Flexible Layout

The body of the hot water circulation unit has a compact design that does not have wiring and piping parts on both sides by incorporating control parts. Therefore, it is possible to place according to the customer's layout such as underneath extruder cylinder or separate installation.