Carbon Black Masterbatch Twin Screw Extruder 30 Percent Loading 120-180 kg h Fast Delivery for Black Colour Batch

Black masterbatch is a dispersion test, not a tonnage contest

Two suppliers can both claim 30 percent carbon black. The difference shows up at 200 mesh: one clogs the screen in minutes, the other runs a full shift. Dispersion is what the buyer is paying for, and dispersion is decided by the kneading sequence, the filtration stage and the melt temperature history, in that order.

Screw layout for carbon black

The screw is built in three acts. First, melting and conveying with medium pitch elements. Second, a high shear dispersive section using multiple 90 degree kneading blocks with reverse elements to raise the local stress enough to break agglomerates. Third, a distributive section that spreads the dispersed black evenly before the die. Running the dispersive stage too early, before the polymer is fully melted, is the most common cause of unmelted black specks.

Filtration tells you the truth

A hydraulic screen changer with 200 mesh packs sits between the die and the pelletizer. Pressure rise across the screen is monitored continuously: a healthy compound holds a stable differential, while rising pressure means agglomerates are passing. Operators learn to read that gauge faster than any laboratory test.

Series data

Shaded frame covers the 120-180 kg/h band; the same screw design scales up on the 62.4 mm frame.

Building the line around it

• Gravimetric feeders for resin, black and wax, because black loading is where cost control lives.
• Die face pelletizing with a water ring, since the melt strength of a 30-40 percent compound will not hold a strand reliably.
• Split barrel sections, so cleaning between black and colour batches takes hours rather than a full day.
• Bimetallic screw elements, as carbon black at high loading is abrasive over long runs.

Questions we get

Can one machine do black and colour? Yes, with a split barrel and quick release screw elements. Plan a cleaning procedure into the changeover; the machine is not the constraint, the cleaning discipline is.

How do I know dispersion is good enough? Ask for a filter pressure value at your target mesh, not a photograph. We quote the expected differential pressure with the proposal.

Give us the black grade, the carrier resin and the mesh you must pass, and the screw layout and filtration get specified together.