Rubber Open Mill (two roll mill)

The rubber open mill is the most basic mixing equipment for rubber and plastic material processing. Through the differential-speed rotation of two rollers in opposite directions, it completes operations such as mastication, mixing, warming, and sheeting of rubber and plastic materials. It features good heat dissipation and flexible temperature control.

It is widely used for mixing and sheeting of materials such as natural rubber, synthetic rubber, PVC, EVA, and modified plastics; at the same time, it can serve as the downstream auxiliary equipment of an internal mixer to cool and sheet the mixed rubber compound.

Roller:
The differential-speed rotation of the two rollers generates shearing, squeezing, and friction, breaking the molecular chains of the product, reducing the elasticity of the product, and increasing the plasticity; it can repeatedly perform triangle-package wrapping and thin passing to make the mixing uniform.

Advantages: Simple structure and easy maintenance; the mixing process is visible and easy to adjust; convenient cleaning, suitable for multi-variety and small-batch production.

1. Equipment Application
It is mainly used for warming and mixing of rubber compound and mastication of raw rubber, and can also be used for sheeting.
The rubber open mill, also referred to as a mixing mill, performs shearing and squeezing on raw rubber materials through two horizontally placed rollers rotating relative to each other at different linear speeds, achieving a process of mastication of raw rubber, mixing of rubber compound, warming, and sheeting.

2. Structural Features

1. Roller: The roller material is chilled alloy cast iron. The hardness of the chilled layer on the roller surface can reach 70±2HSD, and the depth of the chilled layer is 8~22mm;

2. Roller Bearing and Sealing: Rolling bearings are adopted, which can save 5-8% of power. The sealing at both ends of the bearing adopts a frameless oil seal, and the oil seal material is fluorine rubber;

3. Roller Bearing Lubrication: Includes manual grease pump, electric grease pump, or thin oil lubrication;

4. Bearing Housing: Made of cast steel, processed after annealing, and provided with lubricating oil holes;

5. Gap Adjustment Device: Divided into manual adjustment, electric adjustment, and hydraulic adjustment, selected by users according to the rubber mixing process requirements.

6. Rubber Retaining Plate: Divided into fixed type, manual movable type, and hydraulic movable type.

7. Transmission Mode: Divided into single drive with single output shaft, single drive with double output shafts, and dual drive. The reducer adopts a hard-tooth surface reducer with an oil-bath lubrication system; the reducer is a hard-tooth surface reducer with low noise and long service life.

8. Roller Temperature Adjustment Device: Composed of a rotary joint and a spray pipe. An intelligent temperature control system can also be adopted for high temperature control precision;

9. Optional Rubber Turning Device: Saves manpower and improves work efficiency. It is divided into hydraulic rubber turning and mechanical rubber turning.

Main Technical Specification

Item	Open Mill XK-160	Open Mill XK-200	Open Mill XK-250	Open Mill XK-300	Open Mill XK-360	Open Mill XK-400	Open Mill XK-450	Open Mill XK-550	Open Mill XK-560	Open Mill XK-610	Open Mill XK-660	Open Mill XK-710	Open Mill XK-760	Open Mill XK-810
Rubber Sheeting Mill	—	—	—	—	—	XKY-400	XKY-450	XKY-550	—	XKY-610	XKY-660	XKY-710	XKY-760	XKY-810
Roll Diameter (mm)	160	200	250	300	360	400	450	550	560-510	610	660	710	760	810
Roll Working Length (mm)	320	450	620	750	900	1000	1200	1530	1530	1930	2130	2200	2340	2540
Front Roll Linear Speed (Rubber Open Mill) (M/min)	9	15	17.4	15.7	17.7	19.3	21.8	28	26.4	30.5	30	31.9	32	32
Front Roll Linear Speed (Rubber Sheeting Mill) (M/min)	—	—	—	—	—	24.6	25.6	31	—	30	31.6, 30.5	30.26	32	32
Speed Ratio of Rolls (Rubber Open Mill)	1:1.35	1:1.27	1:1.1	1 : 1.17	1:1.25	1:1.27	1:1.27	1:1.2	1:1.2	1:1.13	1:1.24	1:1.2	1:1.13	1 : 1.13
Speed Ratio of Rolls (Rubber Sheeting Mill)	—	—	—	—	—	1:1.08	1:1.08	1:1.09	—	1:1.09	1:1.09, 1:1.13	1:1.09	1:1.09	1 : 1.09
Max Roll Space (mm)	4.5	8	8	10	10	10	12	15	15	15	15	15	15	15
Compound Feeding Capacity (kg)	1-2	10	10-15	10-20	20-25	18-35	50	50-65	50-65	140	165	190	260	350
Motor Power (kw)	5.5	11	18.5	22	30	45	55	110	90	160	185/250	280	355	450
Overall Dimensions - L (mm)	1520	2100	3300	4000	4200	4550	5150	6550	6300	6650	6750	8185	8100	9800
Overall Dimensions - W (mm)	900	1700	1115	1600	1780	1850	1790	2200	2200	2910	3400	3910	4350	5200
Overall Dimensions - H (mm)	1620	1460	1345	1800	1760	1760	1830	1850	1850	2000	2100	2270	2800	2950
Gross Weight (t)	~2	~2.5	~3.2	~5.5	~6.5	~8.3	~11.4	~22	~22.5	~35	~42	~59	~68	~74