Dry Cleaner

The Dry Cleaner is used in plastics recycling to remove contamination in a dry state. Dry, ground or shredded material that has to be coarsely pre-cleaned from sand, stones, glass, paper, etc is introduced into the dry cleaner.

Dry Cleaner	Installed dry cleaner

Method of operation:

A robust rotor fitted with wear-resistant elements is driven by a strong motor, rotating against a basket screen. Thereby shattering brittle material (glass, stones) or reducing into fibres (paper).
During the process the separated contaminating items are pressed through the basket screen and are collected by an automatic screen cleaning system at the base of the dryer. From here, the contaminating materials are conveyed away for waste disposal.

Based on practical examples, it can be shown that 90 – 95 % of the contamination materials can be separated out by a combination of the Dry Cleaner and the ZZ classifier (see below), without coming into contact with water or cleaning solutions.
This saves an enormous amount in operating costs.
• Lower water consumption – therefore less waste water.
• Lower disposal costs – as the waste remains dry. No slurry or wet waste.

ZZ Classifier

The ZZ (Zig-Zag) classifier may be installed for two purposes. For separation of light films or contaminating paper after dry cleaning (see above). Or for separation of fine dust from the final material.

Method of operation:
The ZZ classifier works on the principle of upward vacuum extraction (L – extraction air) of light, contaminating materials by a channel, into which the mixed material (A – mixed material) falls.

The classification performance and quality of the final product (G) can be further increased by making a number of changes in the direction of the material.

Traditionally, it is difficult to separate large amounts of ground materials from each other. As the throughput increases, it has become necessary for the width of the channel to also be increased.

Channels that are too wide however, are difficult to manage in terms of flow technology,

 leading in turn to a negative effect on the sorting result.

Our ZZ classifier always works with the same width, but the number of units is multiplied in order to reach higher throughput.

This is done with a circular arrangement in order to construct the equipment as compactly as possible and to simplify material distribution to the individual classifier units. Material distribution takes place via a distribution plate that evenly distributes the material to be separated over the classifier units.

FLOAT-SINK CONTAINERS The float-sink containers have the task of separating plastics with different densities from each other in a fluid (preferably water), in a closed loop system. As an example; taking PET beverage bottles, it is the PET content that sinks to the bottom of the separation container in the density separation process, while the lighter materials, out of which closures are made, float to the surface of the separation container.

Method of operation: The separation container consists essentially of a tank that is filled with liquid and a screw for material transport after separation. Depending on the separation task, the plastic to be separated is dosed into the separation container with a stirrer or applied under the surface by screws. As can be seen in the accompanying photographs, we have already built a number of different designs for different materials. Advantages • Long life and low maintenance when compared with other methods. • The operating costs are also very favourable, due the very low electrical power rating.

Separation container

Separation container, view 2

Small separation container plant

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