The roller head unit consists of a single or duplex extruder, a die head, and a vertical two-bowl calender with head clamping devices. The broad width head and calender form the rubber compound into a sheet of uniform thickness, which can be varied from 0.5 mm -20 mm or greater in thickness. Nakata roller head units provide significant benefits over conventional calender systems in the production of inner liners, rubber sheets, V-belts, and elastic components.
The sleeve exchange roller head unit is used for profiled inner liner production for passenger, truck, and bus tires. The top roll of the calender incorporates a sleeve, which can carry a profile form. There is an automatic system for storing, preheating and changing the profiled sleeves within three minutes, resulting in high overall productivity and safety. There is an automatic extrusion pressure control system to ensure the accurate thickness of profiled inner liners or profiled sheets in thickness from 0.5mm - 20mm. The unit is ideal for producing air bubble-free profiled inner liner for truck, bus and passenger car tires.
Automatic sleeve exchanging system
Nakata sleeve exchange roller head units are capable of offering both automatic and manual exchange depending on the customer’s operating environment. In the case of automatic exchange, all processes from insertion to and removal of the sleeve from the preheating furnace, to sleeve exchange, can be carried out automatically, resulting in an apparatus that excels in both productivity and safety. Manual exchange employs a specialized C-type hanger, allowing easy attachment and removal of the sleeve.
Manual sleeve exchanging system
Manual sleeve exchange machine part
The duplex roller head unit consists of two extruders, a die head, and vertical two roll calender. The rubber is evenly distributed in the die head over its entire width, and is then fed into the calender nip. A feedback system of control varies the RPM of the extruder screw or calender speed so that high quality rubber sheet (up to 2300 mm wide) can be produced in thickness from 0.5 mm to 20 mm or greater.
| Extruder size |
L/D | Motor -capacity kw |
Sheet head aperture |
Calender roll |
Product sheet |
|||
|---|---|---|---|---|---|---|---|---|
| Width (mm) |
Height (mm) |
Roll diameter (mm) |
Surface length (mm) |
Width (mm) |
Thickness (mm) |
|||
| 300 | 6 | 200 | 1850 | 30 | <600> | <2000> | 1450 | 1.5~9 |
| 250 | 18 | 450 | 2300 | 28 | 700 | 2500 | 2200 | 1~15 |
| 200 | 18 | 300 | 1300 | 28 | 500 | 1500 | 1200 | 0.5~4 |
| 150 | 16 | 200 | 1050 | 28 | 400 | 1300 | 270~1050 | 0.5~5 |
| 120 | 16 | 110 | 700 | 10 | 500 | 1500 | 1250 | 0.1~1.0 |
| 90 | 16 | 45 | 600 | 22 | 310 | 900 | 500 | 1.5~5 |
| 75 | 14 | 30 | 550 | 8 | 400 | 700 | 550 | 0.2~2.0 |
| 60 | 10 | 18.5 | 185 | 5 | 200 | 250 | 100 | 0.5 |
| 45 | 10 | 7.5 | 95 | 3 | 120 | 150 | 100 | 0.3~2 |
| 30 | 10 | 4.4 | 30 | 3 | 80 | 48 | 40 | 0.5 |
This unit can be used for the high speed profiling of small, thin gauge tire components, which can be used for direct application by strip winding to tire assembly units. This unit also can be used to produce small, thin gauge sheet for non-tire applications.
