The goal when manufacturing masterbatches is the optimum dispersion and distribution of the additives in the polymer matrix. This is carried out after wetting by the mechanical energy introduced by the screws. If this takes place too early in the process, the un-moistened pigments can be compressed back into agglomerates by the force exerted on them (cold agglomeration). Two processes can be used to produce a masterbatch: premix and split-feed.

Composition of Masterbatch

• Raw Polymer >10%
• Additives
• Fillers
• Pigments

Dispersion for Masterbatch

Mixing (Homogenization of the mixture)

Dosing (constant addition over time in the continuous extrusion process)

Wetting (bonding of the pigment particles to the matrix without compacting this)

Dispersion (dispersion of the agglomerates in a plasticized state, introduction of the dispersion energy)

Stabilization (prevents re-agglomeration)