Horizontal LSR Injection Molding Machines in Precision Silicone Products

Horizontal LSR injection molding machines are widely used in precision liquid silicone rubber product manufacturing due to their compact structure, high injection accuracy, and suitability for automation integration.

1. Overview of Horizontal LSR Machines

1.1 Structural Features

• Horizontal clamping: Mold opens and closes horizontally
• Vertical injection (some models): Injection unit injects vertically downward
• Dual-cylinder metering: Independent A/B component metering, precise 1:1 ratio
• Cold runner system: Prevents LSR premature curing in runners

1.2 Comparison with Vertical Machines

Horizontal machines have larger floor space but easier automation integration for high-volume multi-cavity production; vertical machines have smaller footprint, convenient insert placement, better for overmolding products.

2. Core Components and Functions

2.1 Metering System

• Precision gear pump/screw pump metering
• Metering accuracy: plus or minus 0.5%
• A/B component pressure balance monitoring
• Automatic degassing function

2.2 Mixing System

• Static mixer: helical blade type
• Mixing uniformity: greater than 99%
• Optional coloring system: liquid pigment metered injection

2.3 Injection System

• Injection pressure: 0-200 MPa adjustable
• Injection speed: multi-stage programmable
• Screw diameter: selected based on shot volume

3. Precision Product Application Cases

3.1 Medical Seals

Product: Medical catheter seal rings, Material: Medical-grade LSR 40 Shore A, Cavities: 64, Cycle time: 25 seconds, Dimensional accuracy: plus or minus 0.03mm

3.2 Electronic Waterproof Keypads

Product: Mobile phone waterproof silicone keypads, Material: LSR 50 Shore A, Cavities: 128, Cycle time: 20 seconds, Waterproof rating: IP67

3.3 Optical Lenses

Product: LED lighting lenses, Material: Optical-grade LSR, Cavities: 16, Cycle time: 45 seconds, Light transmittance: greater than 92%

4. Automation Integration

• Robotic part removal: 3-axis/5-axis servo robots, removal time 3-8 seconds
• Automated production lines: LSR feeding system, mold temperature controller, in-line inspection
• MES system integration: Real-time monitoring, process traceability, quality recording, OEE analysis

5. Equipment Selection Guide

• Shot volume: Part weight x cavities x (1 + 10% runner allowance)
• Clamping force: Cavity projected area x cavity pressure x safety factor (1.2)
• Brands: Import (ARBURG, ENGEL, KRAUSSMAFFEI), Domestic (Demag, Yizumi, Donghua)

Conclusion

Horizontal LSR injection molding machines play a vital role in precision silicone product manufacturing with their high accuracy and efficiency. Proper selection and scientific maintenance are key to ensuring long-term stable operation.