PP recycling

If you operate a plastic recycling facility, you understand that material quality directly impacts your bottom line. After washing and dewatering plastics like PET bottles or LDPE film, one critical step separates premium-grade pellets from inferior products: achieving ultra-low moisture content.

This is where a thermal drying machine becomes indispensable. This comprehensive guide explains how this essential equipment works and why it’s your key to producing high-value recycled plastics.

Why Thermal Drying Is Non-Negotiable: The Moisture Challenge

After mechanical dewatering, plastic flakes and film retain 5-15% residual moisture. This seemingly small amount creates significant problems during pelletizing:

Poor Quality Pellets: Trapped moisture vaporizes in the extruder, creating bubbles and voids that weaken pellet structure and compromise consistency.

Production Instability: Excess moisture causes processing fluctuations, resulting in downtime and reduced throughput.

Lower Market Value: Inconsistent, low-quality pellets command significantly lower prices, directly impacting your profitability.

A thermal drying machine solves this problem definitively, reducing moisture content to below 3%—the industry standard for producing pure, dense pellets ready for high-value applications.

How Thermal Drying Technology Works

Our thermal drying system functions as a precision-engineered hot air system designed specifically for plastic materials. The process combines simplicity with remarkable effectiveness:

1. Material Inlet & Conveyance Washed and dewatered plastic enters the system and moves through an extended network of stainless steel pipes.
2. Hot Air Injection & Tumbling A high-capacity blower propels hot air at controlled velocity through the pipes. As plastic tumbles through the system, every surface receives optimal heat exposure, causing rapid moisture evaporation.
3. Cyclone Separation & Purification The material stream enters a cyclone separator, where centrifugal force separates dry plastic from lighter contaminants like dust and fines, while cooler air helps condense any remaining moisture.

Key Advantages of Our High-Performance Drying System

Achieve Premium Quality Standards

Consistently reach moisture levels below 3%—and below 1% with sequential configurations—to produce top-grade recycled pellets that command premium pricing.

Enhance Material Purity

The integrated cyclone separator actively removes contaminants such as dust, labels, and fine particles, significantly improving final product purity.

Maximize Production Efficiency

Properly dried material flows smoothly through extruders, minimizing processing issues and downtime while maximizing throughput and operational efficiency.

Ensure Consistent Performance

Our systems deliver reliable, repeatable results batch after batch, giving you the consistency buyers demand and you need for predictable operations.

Technical Specifications & Custom Configurations

We recognize that every recycling operation has unique requirements. Our thermal dryers are available in multiple configurations. Here’s our popular RSJ800 model:

• Blower Power: 5.5 KW (Delivers strong, consistent airflow)
• Heating Power: 36 KW (Provides rapid, stable heat)
• Pipe Diameter: 159 mm (Optimized for excellent material flow)
• Material: Type 304 Stainless Steel (Corrosion-resistant, food-grade quality)
• Certification: CE Certified (Meets international safety and quality standards)

Scaling for Higher Capacity: For larger operations or materials requiring ultra-low moisture levels, we offer more powerful models and can design systems with multiple thermal heaters in sequence to meet any throughput requirement.

For specialized applications, thermal dryers can be configured as standalone units or integrated seamlessly into complete washing lines.

Frequently Asked Questions

What distinguishes dewatering from thermal drying?

Dewatering uses mechanical force (typically centrifugal) to remove bulk surface water, typically achieving 5-15% moisture content. Thermal drying employs heated air to evaporate stubborn residual moisture to below 3%. These processes are complementary: dewatering removes the majority of water quickly and economically, while thermal drying delivers the final precision needed for premium pellet production.

What final moisture level will I achieve?

Our standard thermal drying systems consistently achieve less than 3% moisture content. For applications requiring even lower levels (below 1%), such as food-grade rPET production, we configure multiple drying units in series to meet your exact specifications.

Which plastic types can this machine handle?

Our thermal dryers process a wide range of washed plastic materials effectively:

• Rigid plastic flakes (PET, HDPE, PP)
• Soft plastic films (LDPE, LLDPE, PP film)
• PP woven bags and similar materials

How does the cyclone separator enhance quality?

The cyclone separator provides crucial purification. As material and air swirl inside the chamber, centrifugal force separates particles by weight and density. Heavier, dry plastic flakes fall to the collection point, while lighter contaminants—dust, label fragments, and fine particles—exit with the air stream for separate collection. This dual-function design delivers both drying and cleaning in one efficient step.

Do you offer customized solutions?

Absolutely. We understand that standard solutions rarely meet every operation’s needs. We customize heating power, pipe configuration, system dimensions, and capacity based on your material type, required throughput (kg/hr), and target moisture specifications. Our engineering team works directly with you to design the optimal solution for your facility.