Rubber and Plastic Forming
Precision Molded: Hydraulic Cylinders for Rubber & Plastic Forming
The rubber and plastic forming industry relies heavily on precision and consistency to produce high-quality components for diverse sectors, including automotive, construction, and consumer goods. In these demanding manufacturing environments, reliable hydraulic actuation is critical for maintaining the tight tolerances and high clamping forces required for successful material forming. Toleng Hydraulics provides customized hydraulic solutions to meet the stringent performance standards of this industrial sector.
In rubber and plastic processing applications, modern machinery achieves optimal cycle times and product quality through controlled, repeatable motions. Our hydraulic cylinders are ideal for a wide range of molding equipment, such as vulcanizing machines, injection molding machines, and blow molding systems. Toleng Hydraulics supplies robust hydraulic cylinders and rotary joints for these presses and clamping units, currently capable of supporting machinery used in high-volume production runs to cope with the extreme pressures and continuous operation cycles encountered during manufacturing.
Toleng Hydraulics also develops and manufactures specialized hydraulic cylinders and compact hydraulic power units for auxiliary equipment in the plastics industry, such as scrap granulators, conveyors, and robotic handling systems, further enhancing its business portfolio in this essential and growing industry.
- Hydraulic cylinders for rubber and plastic forming machinery, including clamping cylinders, injection units, and ejection cylinders, ensuring precise mold closure and consistent part quality
- High-speed and high-pressure hydraulic cylinders for injection molding machines, providing rapid response and stable holding pressure for complex plastic components
- Custom-engineered cylinders for compression and transfer molding presses, designed for durability and repeatability in high-temperature rubber forming processes
- Hydraulic end position damping and proximity control for smooth mold movements and accurate cycle timing in automated forming lines
- Cylinders with integrated position sensors for real-time monitoring of mold position, enabling closed-loop control and improved process reliability
- Surface treatments and sealing systems tailored for rubber and plastic environments, offering resistance to abrasion, chemicals, and high processing temperatures
References + Applications
Customized hydraulic cylinders for Injection Molding Machine
Injection molding machines operate under some of the most demanding industrial conditions: high-pressure injection cycles, repetitive rapid movements, extreme temperature variations, and continuous long-duration operation. During a 24/7 production run at a large automotive parts manufacturing facility, a fleet of high-tonnage injection molding machines was deployed to produce thousands of precision components daily, including bumper fascias, instrument panels, and interior trim parts. Toleng Hydraulics provided a comprehensive range of custom-engineered cylinders for these injection molding applications, including clamp cylinders, injection cylinders, ejector cylinders, and nozzle contact cylinders.
Clamp Cylinder (Mold Clamping Unit):
Piston Diameter: 320 mm
Piston Rod Diameter: 220 mm
Stroke: 950 mm
Working Pressure: 21 MPa
Function: Generates high clamping force to keep the mold securely closed during high-pressure plastic injection, preventing flash and ensuring part dimensional accuracy.
Injection Cylinder (Injection Unit):
Piston Diameter: 150 mm
Piston Rod Diameter: 100 mm
Stroke: 250 mm
Working Pressure: 24 MPa
Function: Drives the screw or plunger forward to inject molten plastic into the mold cavity at precisely controlled speeds and pressures.
Ejector Cylinder (Ejection System):
Piston Diameter: 63 mm
Piston Rod Diameter: 36 mm
Stroke: 200 mm
Working Pressure: 18 MPa
Function: Activates the ejector pins to push finished parts out of the mold with smooth, controlled motion, preventing damage to delicate components.
Nozzle Contact Cylinder (Injection Unit Positioning):
Piston Diameter: 50 mm
Piston Rod Diameter: 28 mm
Stroke: 150 mm
Working Pressure: 16 MPa
Function: Moves the injection nozzle into tight contact with the mold sprue bushing, ensuring leak-free material transfer during injection.
Core Pull Cylinder (Side-Action Core):
Piston Diameter: 80 mm
Piston Rod Diameter: 50 mm
Stroke: 180 mm
Working Pressure: 20 MPa
Function: Operates side cores for complex part geometries such as undercuts, threads, or snap-fit features, retracting before part ejection.
Technical Highlights:
500 mm – The large-bore clamp cylinders on high-tonnage injection molding machines (2,000 tons and above) are engineered to handle extreme clamping forces exceeding 5,000 kN. Operating at up to 28 MPa, they provide the rigidity required to produce large automotive and appliance components with micron-level precision.
All cylinders feature advanced sealing systems designed to withstand continuous cycling at high speeds while maintaining leak-free performance in operating temperatures ranging from 10°C to 180°C (considering mold heat and hydraulic oil temperature fluctuations).
Integrated magnetostrictive displacement sensors provide real-time position feedback with ±0.1 mm accuracy, enabling closed-loop control for precision injection molding applications such as multi-component molding, thin-wall packaging, and medical device manufacturing. This level of control ensures consistent shot weight and part quality across millions of production cycles.
Some of our Applications
Vulcanizing Machine
Injection Molding Machine