Raw material loaders, dye concentrate dispensers

The operation of extruders is impossible without timely and complete loading of raw materials, which is carried out using loaders: vacuum, spring or screw. Polymer feedstock loaders and dosing devices for colorant concentrates are manufactured to be placed directly on the extruder’s feed hopper or as separate equipment.

Types of raw material loaders

Automatic feeders for polymer raw materials are used to feed powder or granular mixtures into hoppers: dryers or extruder of an injection molding machine as needed. There are several types of feeders that differ from each other in design, principle of operation and application features.

Spring loaders

This type of feeder is suitable for any type of extruder and for loading powdered or granular mixtures: it is fed by a spiral rotating inside the polymer tube. The microprocessor control circuit of the device ensures automatic adjustment of the mixture feed in accordance with the level of raw materials in the feed hopper.

Screw loaders

Screw-type feeders are most often used in conjunction with mixers and extruders to automatically feed raw materials into the feed hopper. Loading is carried out according to a predetermined program on the device’s timer, which ensures an uninterrupted supply of raw materials for processing, optimizes the workflow and minimizes human intervention.

Vacuum loaders

The unit operates on the principle of an air pump and supplies the mixture by creating a vacuum zone inside the hopper. As a result, the mixture is quickly delivered to the injection molding machine’s loading zone and is pretreated through an air filter that removes dust and foreign solid particles.

Dye concentrate dispensers

In cases where colorant needs to be added to the mixture in a precise dosage, automatic dosing systems are used. They are designed for volumetric dosing of colorants and can be used with both injection molding machines and extruders. A stepper motor in combination with a patented dosing cylinder – replacing the traditional screw – guarantees very high accuracy, uniformity and repeatability of dosing.