ISO Silicone Rubber Extruder Machine PVC Extruder Rubber Machine
Application
The cold feed rubber extruder is designed and manufactured to produce semi-finished rubber products of various shapes. The cold feed rubber extruder machine is used for extruding different shape of rubber semi-product. The cold feed rubber extruder is widely used for the production of O-rings, seal rings, sealing elements, rubber sheets, rubber strips, water stops, rubber pads, rubber hoses, rubber belts, cables, railway equipment, tires, inner tubes, and many more. The strength of the machinery comes from the high level of efficiency and volume of output.
Extruder machine type : hot feed extruder ,pin cold feed extruder ,pin-barrel cold feed extruder ,and rubber strainer.
Product description
1. The screw is made from 38CrMoAIA materials with nitride depth 0.5-0.7mm and hardness HV950-1000.
2. The extruder's feeding cylinder is composed of a rear body, front bushing and rear bushing. The structure is a jacketed cast iron style.
1. Rear body uilizes cast steel. It contains a cavity where temperature control circulating water can flow through for the cooling of the rear body. In addition, bushing and feeding devices are also placed within the rear body.
2. Bushings are made from 38CrMoAIA materials. The internal surface hardness is HRC65-70 with a hard layer thickness of 0.5-0.7mm
3. The feeding device is composed of a feeding roller, feeding roller cover, bearing support, gear pair, bearing, and squeegee knife.
Feeding roller surface is treated with a hardening process. The outer surface of the feeding roller is equipped with a rubber return trough on both ends to prevent rubber from entering the support bearings. A squeegee knife is also provided to scrape rubber materials on the roller cylinder surface. The knife is fixed on the roller cylinder with adjustable spacing.
Feeding mouth is rotated to open. The feeding rollers feature grease lubrication to achieve optimal effectiveness.
4. Roller cylinder adopts 38CrMoAIA materials. Its surface is processed through a nitriding treatment. The internal surface hardness is HRC65-70. The hard layer depth is 0.5-0.7mm. Along the cylinder surface there is axial path for temperature control circulating water which serves for heating and cooling the cylinder.
5. Reducer features hardened gears with a level 6 transmission accuracy. The reducer is also equipped with a gear pump with a forced lubrication system which has the function of spraying and oil cooling.
| Mode | XJW-65 | XJW-90 | XJW-120 | XJW-150 | XJW-200 |
| Screw dia, mm | 65 | 90 | 120 | 150 | 200 |
| L/D Ratio | 12 | 12；14；16；20 | 12；14；16 | 14；16 | 12；14；16 |
Motor Power
(kw) | 15 | 55-90 | 75-110 | 185-220 | 315-355 |
EPDM sealing strip extruder: technical details and selection guide
EPDM (ethylene propylene diene monomer rubber) sealing strips are widely used in the automotive, construction, rail transit and other industries. They are the preferred material for sealing solutions due to their excellent weather resistance, ozone resistance and elasticity. EPDM sealing strip extruder is the core equipment for the production of such products. Its design must take into account both material properties and process requirements. The following is an analysis of key technologies and applications:
1. Core requirements of EPDM sealing strip extruder
Material property adaptation
EPDM has poor fluidity and high viscosity, requiring high-torque screws and forced feeding systems.
Sensitive to temperature (optimal processing temperature: 80–120°C), requiring precise temperature control.
Process difficulties
Easy to entrain air → vacuum exhaust function required.
Complex cross-section (such as multiple lips, hollow structure) → high-precision die and shaping device required.
2. Equipment composition and key technologies
1. Extrusion system
Screw design:
Length-to-diameter ratio (L/D): 18:1–22:1 (high compression ratio 1.8:1–2.5:1).
Mixing section: Barrier screw or pin mixing section to ensure uniform plasticization of EPDM.
Barrel temperature control: Multi-stage PID control (±1℃ accuracy) to avoid material scorching.
2. Feeding system
Forced feeding roller: Prevent EPDM from slipping (common in cold feed extruders).
Premixing device: Optional to ensure uniform dispersion of carbon black/additives.
3. Vacuum exhaust system
Two-stage screw: first stage plasticization, second stage vacuum degassing (vacuum degree ≥ 0.08MPa).
Bubble removal: Reduce internal defects of sealing strips.
4. Die head and die
Flow channel design: Gradient flow channel to avoid dead glue and adapt to complex cross-sections (such as automotive door and window sealing strips).
Material: Chrome-plated or high-strength alloy steel, wear-resistant and corrosion-resistant.
5. Auxiliary equipment
Cooling water tank: segmented cooling (60℃→room temperature) to prevent deformation.
Traction machine: servo motor driven, speed synchronization accuracy ±0.5%.
Cutting/coiling: laser length measurement and fixed length cutting, or automatic coiling.
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