for the production of cables.
- Outer diameter of lead layer can be made between 10 and 110mm, to be
achieved by two sets of extruding modules, one at diameter of 10~88mm,
another one at 40~110mm. Users can choose either of them.
- With a screw to feed lead, it is possible to achieve continuous extrusion, so
thickness of lead layer keeps constant and even in longitudinal direction.
- In addition, unique design for strict control of temperature in every section
makes temperature and extrusion pressure constant at each section. Thus
thickness of lead layer can be controlled within a minimal common difference.
- Consumption of lead is 10% less than that of intermittent lead pressing machine.
- Environment friendly design. The melting furnace, the purifying & holding
furnace, and lead conveyor all work in an enclosed system. In addition, as
temperature of molten lead is relatively low, distribution of steam is greatly
minimized.
- A small area is needed for the machine, which is easy to operate, low in labor
intensity, as only two operators are needed for the machine.

2. Specifications
2.1. Extruding screw
- Diameter: 150mm
- Rotation speed: 5~15rpm
2.2. Lead output
- Pure lead: 30~35kg/min. at 13~15rpm
- Soft alloy lead: 20~22kg/min. at 11~12rpm
- Hard alloy lead 15~16kg/min. at 9~10rpm
2.3. Diameter of lead pipe
- Die holder No. 1: 10~80mm
- Die holder No. 2: 40~110mm
2.4. Melting furnace
- Capacity: 18 tons
- Power: 101.1kW
2.5. Purifying & holding furnace
- Capacity: 10 tons
- Power: 101.1kW
2.6. Cooling water consumption: 6.8 ton/hr.
2.7. Total power of extruder: 145kW
2.8. Lead stripper
- Vertical type
- Power: 15kW
2.9. Lead flake conveyor
- Power: 1.5kW
2.10. Take-up drum size: PN1250~PN2500
2.11. Space required: 22000x13340x5100mm
2.12. Power supply: 380V, 3-phase, 50Hz, AC
3. Materials Processed
3.1. Pure lead, and alloy lead
3.2. Suitable alloy lead as follows:
- Pb-Sb alloy: Sb 0.5%~0.6%
- Pb-Sn-Sb alloy: Sn 0.4~ Sb 0.2%
- Pb-Sb-Cu alloy: Sb 0.04%, Cu 0.04%
- Pb-Sn-Cd alloy: Sn 0.2%, Cd 0.075%
3.3. As the product is extruded lead tube, alloy elements are distributed evenly, so the
quality of lead extrusion is good, it is therefore not necessary to increase the
content of antimony (Sb) in lead alloy.
3.4. Please note that lead alloy with antimony over 0.6% is not allowed due to the
limitation of the technical process and the difference in the construction of the
machine.
4. Output Capacity
Lead Type Screw Rotation Speed (rpm) Extrusion Output
(kg/min)
Pure lead 13~15 30~50
Soft lead alloy 11~12 20~22
Hard lead alloy 9~10 15~16
5. Features of Process
5.1. Constant temperature
- During the process when molten lead flows out from the furnace and flows into
the extrusion cylinder via the conveyor and finally forms into lead layer, the
temperature at every section remains constant at the preset value, within a
range of 3 degrees centigrade.
- The bigger the difference in temperature of the molten lead during extrusion, the
greater the thickness of lead tube varies. Normally, difference in temperature by
every 10 degrees leads to a difference of 0.1mm in thickness.
5.2. Constant pressure
- The pressure of extrusion is constant because both the rotation speed of screw
and the temperature of molten lead are constant.
- This guarantees an even thickness of lead layer.
5.3. Constant speed
- As lead extruder is operating under constant temperature, pressure, and speed,
the thickness of lead layer is even and so can be adjusted to a minimal value. As
a result, the consumption of lead is reduced.
6. Construction and Function
6.1. Melting furnace, 18-ton

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