Product Descriptions
General Overview - Industrial Positioning of the BOY 125 E Platform
The BOY 125 E is one of the most powerful injection molding machines in the Dr. BOY product portfolio and represents the upper tonnage limit of the brand with a clamping force of 1250 kN. This model is specifically developed for applications requiring larger molds, higher shot volumes, and increased material throughput. Its design philosophy goes beyond simply increasing size; it focuses equally on accessibility, ergonomics, and process reliability.
The BOY 125 E is a multi-disciplinary production platform suitable for processing thermoplastics, elastomers, silicones including LSR, thermosets (duromers), as well as metal and ceramic injection molding feedstocks used in PIM technology. Despite this wide range of capabilities, the machine maintains a compact footprint of approximately 5.22 m² for its class.
Clamping Unit - 1250 kN Four Tie-Bar, Two-Platen Cantilever System
The BOY 125 E features a four tie-bar, two-platen clamping unit with a cantilever design. This structure provides excellent accessibility to the mold area and enables fast mold installation, even for large and heavy tools.
Clamping unit technical data:
- Clamping force: 1250 kN
- Tie-bar spacing (H × V): 470 × 430 mm
- Maximum daylight between platens: 825 mm
- Maximum adjustable mold opening stroke: 525 mm
- Minimum mold height: 300 mm
- Maximum mold weight on moving platen: 680 kg
- Mold opening force: 48.5 kN
- Mold closing force: 49.2 kN
- Maximum ejector stroke: 150 mm (optional 130 mm)
- Ejector forward / return force: 20.4 / 13.5 kN (optional 42.7 / 30 kN)
The reinforced support of the moving platen ensures mold parallelism is maintained even during long cycle times and with heavy molds.
Injection Unit - SP 420 Thermoplastic Injection Unit
The BOY 125 E is equipped as standard with the SP 420 injection unit designed for thermoplastic processing. This unit offers high injection force and a wide range of screw diameters, making it suitable for large and technically demanding parts.
SP 420 injection unit technical data:
- Screw diameters: 36 / 42 / 48 / 52 mm
- Screw L/D ratios: 23 / 20 / 17 / 16
- Maximum theoretical stroke volume: 162.8 / 221.6 / 289.5 / 339.8 cm³
- Maximum theoretical shot weight (PS): 148.1 / 201.7 / 263.4 / 309.2 g
- Injection force: 263 kN
- Theoretical injection rate: 194.4 / 264.7 / 345.7 / 407.3 g/s
- Maximum specific injection pressure: 2,584 / 1,899 / 1,454 / 1,239 bar
- Maximum screw stroke: 160 mm
- Nozzle contact force: 65 kN
- Nozzle retraction stroke: 243 mm
- Screw torque: 500 / 530 Nm
- Screw speed: 250 - 280 rpm, continuously adjustable
- Screw recovery force: 53 kN
- Heating power (nozzle + barrel): 11,250 W
- Material hopper capacity: 20 liters
These parameters ensure stable and repeatable production even for large part geometries requiring high filling speeds.
Servo-Hydraulic System and Energy Management
The BOY 125 E operates with a servo-motor-driven hydraulic pump system. Hydraulic power is generated only when required by the process. Dr. BOY's patented pressure intensifier system maintains clamping force during injection and cooling phases without the need for an additional pressure-holding pump.
Energy and hydraulic system data:
- Installed drive power: 22.5 kW
- Total installed power: 33.8 kW at 400 V
- Hydraulic system pressure: 192 bar
- Oil tank capacity: 220 liters
- EUROMAP 6 dry cycle time: 2.5 s at 329 mm stroke
This configuration ensures energy-efficient and low-noise operation even in the high-tonnage segment.
EconPlast Technology - High Wear Resistance and Extended Service Life
The BOY 125 E can optionally be equipped with the EconPlast plasticizing unit. This technology significantly extends screw and barrel service life while reducing energy consumption, especially when processing glass-fiber-reinforced and abrasive materials.
Key advantages of EconPlast technology:
- Lower energy consumption
- More homogeneous melt structure
- Reduced material degradation
- Extended maintenance and service intervals
Control System - Procan ALPHA
The BOY 125 E operates with Dr. BOY's advanced Procan ALPHA control system.
Control system capabilities:
- 8-stage injection speed control
- 2-stage injection pressure control
- 8-stage holding pressure control
- Holding pressure switchover based on pressure, stroke, or time
- Closed-loop injection and back-pressure control
- Production monitoring, part and cycle counting
- USB, Ethernet, and OPC interfaces
- EUROMAP 67 robot interface
Machine Dimensions and Layout Advantages
Despite its high performance, the BOY 125 E offers a compact installation footprint within the 1250 kN class.
Physical dimensions:
- Dimensions (L × W × H): 3,850 × 1,357 × 2,063 mm
- Footprint: 5.22 m²
- Net weight (without oil): 4,700 kg
- Gross weight: 4,920 - 5,370 kg
Application Fields and Material Compatibility
The BOY 125 E is widely used in the following applications:
- Large and heavy technical plastic parts
- Electrical and electronic housings
- Automotive and industrial components
- Elastomer, LSR, and thermoset applications
- PIM processes for metal and ceramic injection molding
- High-throughput serial production
Conclusion - Why Choose the Dr. BOY 125 E?
The Dr. BOY 125 E injection molding machine delivers a top-tier production platform with its 1250 kN clamping force, large mold space, high injection capacity, and servo-hydraulic energy management. The cantilever clamping system, EconPlast technology, and advanced control architecture ensure stable, repeatable, and economical production even with large and heavy molds.
For applications where high tonnage, large part geometries, and long-term process reliability are critical, the BOY 125 E represents a powerful and dependable injection molding solution.
