Granule Sieve

What is a granule sieve?

Pelletised plastic rarely arrives perfectly uniform. Whether it comes from bags, a silo or a compounding line, it usually contains clumped or "married" pellets, long cuts, fine dust from pelletising and sometimes foreign matter. A granule sieve sorts this material by size: on-spec pellets go to the product outlet, while oversize and fines are discharged separately.

The result is free-flowing, uniformly sized granules at your extruder or injection moulding machine — which means a more stable melt, fewer rejects and fewer unplanned stops.

How a granule sieve works

Granule screening is usually done on the vibratory principle. Material is fed onto the top screen, and vibration moves the pellets across the screen surface so that each one meets the apertures many times.

1. Feeding: Pellets are fed in a controlled way from a silo, hopper or conveying system.
2. Scalping: Oversize and clumped pellets that cannot pass the screen stay on top and leave through their own outlet.
3. Fines removal: Where needed, a second screen deck separates dust and fragments from the product stream.
4. Clean product outlet: On-spec pellets are discharged to an intermediate hopper or straight into the feeding line.

The number of decks, the screen aperture and the type of screen cloth are selected per application, based on pellet size, shape, flowability and your quality target. Rather than quoting a fixed mesh size, we start from your material and define the right configuration with you.

Where it is used

• Before extrusion and injection moulding: check screening to keep foreign matter and lumps away from the screw, die and nozzle.
• After compounding: removing oversize and dust after pelletising, before bagging or silo storage.
• Recycled pellets: evening out particle size in reclaimed material of mixed size and cleanliness.
• Masterbatch and additive pellets: size control for smooth flow and accurate ratios in dosing.

Why sieve granules?

• A more stable process: uniform pellets melt more evenly in the feed zone, reducing pressure and output swings.
• Fewer rejects: surface defects, specks and thickness variation often trace back to inconsistent raw material.
• Equipment protection: foreign matter wears and blocks screws, screen packs and dies.
• Dust control: removing fines cuts dust build-up in conveying lines and around the machine. An air filter can clean the conveying air on the same line.

Sieving powders instead?

If the material is a powder — for example PVC dry blend leaving the mixer — the task is different. A powder sieve designed to catch agglomerates and foreign matter is the right choice there. See all our solutions in the sieving and filtration category.

Line integration

Erk PVC Makine does not build extruders; we design and install the raw material preparation line in front of them. The granule sieve is laid out together with silos, hoppers and a flexible screw conveyor, so screened pellets reach the feed point without manual handling.

Installation and after-sales support

Our sieves are manufactured and checked at our factory in Ergene, Tekirdağ before shipping. As on the lines we have supplied to more than 46 countries, we handle installation, commissioning, operator training, remote technical support and replacement screen cloth.

Fill in the form below to define the right sieve configuration for your pellets and receive a quotation.