How to Optimize Barrel Temperature Profiling for Recycled Polymers > 자유게시판

Successfully managing barrel temperatures with recycled polymers hinges on acknowledging their inherent impurities, molecular degradation, and inconsistent chemical profiles relative to new resins

The first step is to understand the thermal history of the recycled material

Repeated extrusion and reprocessing can significantly reduce chain length and shift the melting profile

They frequently begin softening earlier and are far more prone to decomposition when exposed to excessive heat

Start with comprehensive lab analysis of your feedstock

Use differential scanning calorimetry or melt flow index tests to determine the melting range and viscosity characteristics of your specific recycled batch

These results form the foundation for your thermal profile

Using standard profiles for new resin can cause charring, uneven viscosity, or flow instability

Set the barrel zones with a gradual temperature increase from the feed zone to the metering zone

The feed zone should be kept relatively low, just above the material’s glass transition temperature, تولید کننده کامپاند پلیمری to prevent bridging or premature melting that can cause poor feeding

Allow the compression zone to incrementally increase heat to achieve full melt without overworking the polymer

Set the metering zone temperature to stay safely beneath the onset of thermal breakdown

Track real-time melt viscosity via an accurate inline sensor

This real-time feedback is critical because recycled materials can vary batch to batch

When melt exceeds target, lower rear barrel settings and decrease screw RPM to cut shear-induced heat

Cold melt? Warm the front zones incrementally and cautiously raise screw speed

Reduce the time material spends in the barrel

These materials degrade faster under extended heat, so shorten cycles and eliminate idle holds

Scrape and flush the barrel and screw after each run to eliminate carbonized residues

Finally, consider blending recycled material with a small percentage of virgin resin if possible

This can improve process stability and reduce the need for aggressive temperature adjustments

Validate settings through controlled small-scale runs and log effects on appearance, integrity, and performance

Long-term tracking enables the creation of a precise, repeatable profile for your unique recycled material