Injection Molding Machines Sticking or Making Noise? Try These High-Performance Lubrication Solutions

Injection molding machines are the backbone of plastic manufacturing. Designed for high-pressure, high-speed, and continuous operation, they rely heavily on precision lubrication to perform smoothly.

Yet in real-world production, many factories report frequent issues such as:

• Sticking or jerky motion during mold open/close

• Unexpected squeaking or vibration

• Ejector pins moving sluggishly

• Overheating bearings in electric motors

• Increased downtime and frequent maintenance

The root cause of many of these failures? Improper lubrication or using the wrong grease.

? Common Lubrication Problems in Injection Molding Equipment

✅ Key Lubrication Points & Recommended Greases

? What Makes a Great Injection Molding Grease?

1. High Temperature Resistance
   Machines run hot — standard lithium greases break down or evaporate quickly. Use PFPE or synthetic greases for longer durability.

2. Strong Extreme Pressure (EP) Protection
   Ejectors and sliders are under high mechanical stress. Grease must contain EP additives to prevent metal-to-metal wear.

3. Balanced Consistency
   Avoid overly thick grease that resists movement. Medium NLGI grades (No. 1 or 2) offer smooth, consistent lubrication.

4. No Carbonization or Varnish Formation
   A clean grease will not leave behind residue that clogs parts or disrupts precision movement.

⚙️ Benefits of Switching to High-Performance Grease

✅ Smoother mold open/close cycles
✅ Reduced vibration and operating noise
✅ Lower maintenance frequency and labor costs
✅ Extended machine component life
✅ Improved production consistency and quality

? Who Should Consider a Grease Upgrade?

• Plastic injection factories experiencing frequent breakdowns

• Facilities running machines for long hours with minimal shutdowns

• Companies aiming to reduce preventive maintenance intervals

• Any plant looking to improve OEE (Overall Equipment Efficiency)

? Final Tip: Lubrication Is a Small Part with a Big Impact

Grease may seem like a minor detail in your machine’s operation, but it plays a major role in efficiency, longevity, and product quality.

If your machines are sticking, squeaking, overheating, or wearing out too soon, it’s time to re-evaluate your lubrication choices.