PALAMAU, INDIA – Sep 10, 2026 – The previous production run may be finished, but that does not necessarily mean the machine is ready to begin again with a clean slate.

Inside an injection molding machine, remnants from the earlier run can remain in the barrel. Burned material, foreign contaminants, un-melted resin and tarnished leftovers may all become part of the changeover discussion. According to UNICLEANPLUS, what stays behind can affect what comes next. 

The issue often becomes particularly relevant during colour changes or carbon removal. Purging with resin alone can involve waste and lost production time, the company notes on its injection molding page. Its ready-to-use, pre-mixed Purging Material Injection Moulding is designed for use in the injection molding process to help remove several forms of residual material from the machine barrel. 

A representative associated with UNICLEANPLUS put it another way: “The last job doesn't always leave quietly. Sometimes it stays in the barrel and shows up when you least want it to. That's why the cleaning stage needs its own attention.”

The company's published purging procedure also makes clear that the material itself is only one part of the process. Temperature ranges, cleaning the hopper and feed throat, backpressure, screw speed and repeated purging where contaminants remain detectable are all included in the instructions. Small process steps, perhaps, but not entirely small when a machine is being prepared for another production run. 

UNICLEANPLUS states that proper purging can help reduce scrap parts, carbon accumulation, colour hang-up, colour-changing time and overall changeover time, while also decreasing downtime. The company offers its purging compounds for injection molding and provides trial samples and consultation through its website. 

For injection molders, the changeover period can easily be treated as the gap between two jobs. UNICLEANPLUS is drawing attention to another view: that the condition left inside the machine may still be part of the next job.

About UNICLEANPLUS

UNICLEANPLUS™ offers purging compounds for plastic processing applications, including injection molding, extrusion and blow molding. The company presents its products as ready-to-use, pre-mixed compounds and provides guidance on purging procedures, along with free trial sample options and consultation. 

Website: https://www.unicleanplus.com/ , Email: [email protected]