

Demaji Screw Barrel
Hi TECH Machinery General Trading L.L.C is innovative and Quality Trustworthy Enterprise which is committed to fueling our customer’s success with features that streamline the entire production process. Our portfolio includes a broad range of high-quality Screw & Barrel, Conical Twin Screw, Parallel Twin Screw, Bimetallic Screw and Gearboxes Series.
Selecting process of the appropriate screw and barrel combination for your plastics products plays an important role in success or failure of any particular machine. If you neglect this selection and focus only on the clamping force, then you may produce bad parts, faster due to improper delivering melt and mix material to the mold. Hi-Tech Machinnery offers screw & barrel that have better L/D ratio, screws design, torque readout, pressure readout and temperature readout for injection moulding machine, single screw extruder, twin conical screw extruder and twin parallel screw extruder.
L/D (length divided by diameter) in extrusion is normally 30:1 or greater, while in injection molding machine it is 20:1 normally. Larger L/D ratio has tangible benefits such as:
- More uniform shear heat is obtained without any degradation.
- Greater mixing generates a better homogeneity of the melt
- Faster cycles of larger shots are ensured through greater residence time of plastic in the barrel.
A proper screw design provides proper mixing and color dispersion without reducing the injection rate.
Our offered Gearboxes Series for single-screw extruder and twin-screw extruder have best transmission efficiency, sufficient safety factor and high torque. Value-added advantages of DEMAJI’s high-quality Gearbox Series include less noise, robust design, enhanced accuracy, robust design, thrust bearings, efficient performance, easy to replace, efficient transmission and high boost output. Typical applications of Gearboxes are automobile parts industry, chemical industry, oil refining industry, electrical industry and mining.
Screw for Injection Molding Machine | ||
Amount of Injection (gram) | Screw Diameter x Length (mm) | Barrel Diameter x Length (mm) |
30-90 | ϕ30*900 | ϕ85*860 |
60-125 | ϕ35*910 | ϕ85*860 |
100-150 | ϕ38*935 | ϕ95*900 |
125-160 | ϕ40*980 | ϕ95*910 |
125-300 | ϕ42*1030 | ϕ105*1880 |
250-400 | ϕ45*1210 | ϕ115*1165 |
300-500 | ϕ50*1300 | ϕ125*1260 |
450-600 | ϕ55*1335 | ϕ130*1320 |
500-700 | ϕ56*1350 | ϕ130*1350 |
500-700 | ϕ60*1380 | ϕ140*1350 |
650-800 | ϕ65*1415 | ϕ150*1420 |
700-1000 | ϕ70*1790 | ϕ160*1685 |
800-1250 | ϕ75*1825 | ϕ170*1725 |
1000-1500 | ϕ80*2000 | ϕ180*1805 |
1250-2000 | ϕ85*2300 | ϕ190*1900 |
2000-3000 | ϕ90*2700 | ϕ210*2000 |
2500-5000 | ϕ100*2600 | ϕ230*2405 |
3000-6000 | ϕ110*2600 | ϕ256*2590 |
4000-10000 | ϕ120*2800 | ϕ256*2800 |
6000-8000 | ϕ130*3010 | ϕ256*2970 |
8000*10000 | ϕ145*3010 | ϕ256*3200 |
10000-15000 | ϕ160*3500 | ϕ270*3200 |
13000-25000 | ϕ170*3415 | ϕ317*3380 |
Screw and Barrel for Single Screw Extruder | |||||
Model | L / D | Output Capacity (kg/h) | Screw Rotation Speed (rpm) | Driving Motor (KW) | Center height (mm) |
DMJ20 | 20:1 | 3-5 | 10-60 | 1.1 / 1.5 / 2.2 | 1000-1400 |
DMJZS25 | 25:1 | 5-8 | 10-60 | 2.2 / 3.0 / 4.0 | 1000-1400 |
DMJ30 | 25:1 | 5-10 | 10-60 | 2.2 / 3.0 / 4.0 | 1000-1400 |
DMJ45 | 25-36:1 | 10-120 | 10-150 | 5.5-22 | 1000-1400 |
DMJ65 | 25-36:1 | 60-300 | 20-150 | 22-75 | 1000 |
DMJ75 | 25-36:1 | 200-450 | 20-150 | 30-132 | 1000 |
DMJ90 | 25-36:1 | 180-600 | 20-110 | 30-185 | 1000-1100 |
DMJ120 | 25-36:1 | 320-1000 | 20-90 | 75-280 | 1000-1250 |
DMJ150 | 25-36:1 | 400-1300 | 20-75 | 90-400 | 1000-1300 |
Screw and Barrel for twin Conical Screw Extruder | ||||
Model | Motor Power (KW) | Screw Diameter (mm) | Screw Rotation Speed (rpm) | PVC Production (kg/h) |
DMJ45 / 90 | 15 | 45 / 90 | 34.7 | 60-80 |
DMJ50 / 105 | 18.5 | 51 / 105 | 34.7 | 80-100 |
DMJ55 / 110 | 22 | 55 / 110 | 34.7 | 120 |
DMJ65 /132 | 30-37 | 65 / 132 | 34.7 | 150-250 |
DMJ80/ 156 | 55 | 80 / 156 | 34.7 | 250-400 |
DMJ92 / 188 | 110-132 | 92 / 188 | 34.7 | 500-700 |
Screw and Barrel for twin Parallel Screw Extruder | |||||
Model | Motor Power (KW) | Screw Diameter (mm) | L /D | Screw Rotation Speed (rpm) | PVC Production (kg/h) |
DMJ75 | 45 | 75 | 26-36 | 45 | 220-350 |
DMJ90 | 55 | 90 | 26-36 | 45 | 280-460 |
DMJ110 | 75 | 110 | 26-36 | 45 | 350-650 |
DMJ120 | 110 | 120 | 26-36 | 45 | 500-80 |
DMJ130 | 132 | 130 | 26-36 | 45 | 680-1000 |