SJ series PET flakes pelletizing machine from Purui Machinery addresses this fundamental issue through an integrated drying and extrusion workflow. Engineered specifically for washed, post-consumer PET bottle flakes.
Processing post-consumer bottle flakes presents significant thermal and chemical challenges. Because Polyethylene Terephthalate (PET) is highly hygroscopic, extrusion processing without adequate pre-treatment triggers severe hydrolytic degradation. This breakdown breaks polymer chains and lowers the Intrinsic Viscosity (IV) of the material, rendering recycled pellets unfit for demanding downstream applications like bottle-to-bottle resin or high-tenacity filament spinning.
The SJ series PET flakes pelletizing machine from Purui Machinery addresses this fundamental issue through an integrated drying and extrusion workflow. Engineered specifically for washed, post-consumer PET bottle flakes, this system stabilizes the feeding process and strictly controls material degradation from start to finish. By establishing uniform moisture removal prior to melt-processing, our PET flakes pelletizing line delivers uniform, high-density granules that preserve original resin properties.
Standard single-screw extruders often fail when fed directly with ambient PET flakes because residual moisture causes instant hydrolysis in the heated barrel. Purui Machinery equips the SJ series system with a specialized one-stage hot dehumidified air drying unit directly above the extruder inlet.
Assuming an initial moisture content of ≤1.0%, the system continuously exposes incoming flakes to conditioned, dry air at elevated temperatures. Moisture is removed systematically before the flakes reach the feed throat. This pre-conditioning step eliminates the need for complex vacuum systems while ensuring the plasticizing zone operates under dry material conditions.
A common defect in conventional drying hoppers is uneven material residence time—where material channels down the center while older flakes stick to the hopper walls. This leads to inconsistent moisture levels at the feed throat.
Our drying hopper geometry is engineered by Purui Machinery for true First-In, First-Out (FIFO) bulk material flow. Flakes discharge into the granulating line in the exact sequential order they were loaded. Every individual flake receives identical heat exposure and drying time, resulting in homogenous moisture removal and stable extrusion motor torque.
The ultimate benchmark for any quality PET flakes pelletizing line is its ability to preserve original molecular weight. Excessive heat, uneven drying, or high shear stress in the screw zone degrade IV rapidly.
By synchronizing precise dehumidified pre-drying with an optimized screw profile designed for gentle melting, Purui Machinery strictly caps finished pellet IV reduction to under 0.04 dL/g. Maintaining high IV values allows plastic processors to reuse recycled PET pellets in premium applications without blending excessive amounts of virgin resin.
A: It is specifically designed for post-consumer PET bottle flakes that have been properly washed, cleaned, and sorted.
A: The system uses continuous one-stage hot dehumidified air drying to extract moisture prior to extrusion, preventing hydrolytic degradation when the resin melts.
A: The machine handles input flakes with an initial moisture content of 1.0% or less (≤1.0%) to achieve target drying performance.
A: FIFO ensures that every flake stays in the hopper for the exact same amount of time, guaranteeing uniform drying quality across the batch.
A: Thanks to controlled drying and gentle extrusion, the Intrinsic Viscosity (IV) reduction is reliably kept under 0.04 dL/g (＜0.04 dL/g).
A: Yes, our factory is located in Rugao City, Jiangsu Province, China. Please contact our sales specialists if you would like a tour.
A: The lead time depends on the complexity of the order. Standard individual machines might have a shorter lead time, while a complete, custom recycling line could take. The specific timeline is usually outlined in the contract.
A: Yes, we offer after-sales support, including remote guidance, and can arrange for engineers to assist with on-site installation, commissioning, and staff training for larger projects.
