How to Properly Use Purging Material for Injection Molding Machines

Injection molding is one of the most widely used methods for high-volume plastic manufacturing. While the process is efficient, one critical maintenance step is often overlooked—purging. Using the right Purging Material for Injection Molding machines helps prevent contamination, reduce machine downtime, and ensure smooth transitions between different materials and colors. 

With India’s plastic manufacturing sector rapidly expanding, it’s essential for manufacturers to adopt proper purging practices to maintain operational efficiency and product quality.

Why Purging is Important

Purging involves cleaning internal machine components—such as the barrel, screw, and nozzle—using a dedicated Purging Compound. It should be performed:

• When switching between different resins or colors

• Before shutting down the machine

• As part of regular maintenance routines

Skipping this step can lead to cross-contamination, defective products, and increased wear and tear on your equipment.

Selecting the Right Purging Compound

The Indian market offers three primary types of Purging Compounds:

• Mechanical Purging: Uses high-viscosity materials that physically scrub and remove residues.

• Chemical Purging: Uses chemical reactions to break down and eliminate contaminants.

• Hybrid Purging: Combines both mechanical and chemical cleaning for optimal results.

The right choice depends on your machine type, resin characteristics, and the type of contamination. To determine the best fit, consult with your supplier or request free samples from UNICLEAN PLUS.

Purge at the Proper Temperature

For effective purging, the machine should be set to the same temperature as the production resin. Operating at higher or lower temperatures can reduce the effectiveness of the purge and leave residue behind.

Always follow the temperature guidelines recommended by the resin and Purging Compound manufacturers to ensure proper results.

Step-by-Step Purging Procedure

Follow these key steps for a successful purge:

1. Stop feeding the current resin.

2. Load the Purging Material into the hopper.

3. Switch the machine to manual mode and run short shots until only clean purge material exits the nozzle.

4. Repeat the process until no visible color or contamination remains.

5. If changing to a new resin, flush the system with a small amount of the new material to remove any remaining purge residue.

Standardize the Process Across Your Facility

Inconsistent purging methods can lead to production inefficiencies and unnecessary waste. To maintain quality and consistency:

• Develop a clear Standard Operating Procedure (SOP) for purging.

• Train all operators to follow it correctly.

• Maintain detailed records of purging frequency, materials used, and results to track performance and improve processes.

Choose UNICLEAN PLUS for Reliable Purging Solutions

Using High-quality Purging Material for Injection Molding from UNICLEANPLUS is not just good practice—it’s a smart business move. Our Purging Compounds help:

• Prevent contamination and color streaking

• Extend the life of your machines

• Reduce downtime and changeover time

• Enhance product quality and consistency

Give your production line the efficiency it deserves.

Call +91 9021232809 to place your order or request free samples from UNICLEANPLUS today.