Herbold says its HVT series centrifugal dryers save money

Vertical rotor shaft ensures longer dwell time in the drying chamber, company says.


HVT series centrifugal dryers from Herbold USA, Smithfield, Rhode Island, provide energy saving drying of regrind, especially hollow bodies, polyethylene terephthalate (PET) bottles, polyolefins and other plastics, the company says.

Herbold says the HVT features a vertical rotor shaft, which ensures longer dwell time in the drying chamber and offers the added advantage of significant space savings versus horizontal systems. The refinement of the HVT’s internal geometry, including the rotor and housing, minimizes the occurrence of fines and allows for greater yield, according to the company.

HVT dryers operate on the principle of centrifugal drying. Material is accelerated against a screened stator surface and simultaneously transported from bottom to top by rotor paddles. Feeding is via a horizontal drainage screw, which eliminates most of the surface moisture before material enters the dryer, Herbold says.

Energy savings are achieved by a reduction in motor size. A typical one- or two-stage drying system for PET flakes with a 150-horsepower motor would yield a throughput of 2.5 to 3 tons per hour, Herbold said. An HVT system can equal that performance with a 75-horsepower drive motor.

The HVT’s housing features large doors to provide easy access to components, which is designed to simplify routine maintenance. Rotor paddles and screens can be changed quickly and easily, and the unit’s housing is equipped with strategically located replaceable wear plates.

The machines are available in standard or stainless steel configurations.

Herbold Meckesheim USA, a subsidiary of Herbold Meckesheim Germany, designs, manufactures and installs size-reduction equipment and wash-line systems for the plastics industry, specializing in the recycling of industrial and postconsumer plastics. 

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