UNIBLEND continuous kneader is a high performance, broad spectrum Compounding Machine which operates on a unique Synchronous Reciprocating Screw principle, which sets it apart from all other screw type compounders, either twin screw or single screw. As in all contemporary high technology compounding systems the polymer is charged in the machine from the first inlet port and the fillers, fibres, additives etc. are charged through subsequent ports in the barrel into the already molten polymer stream .

What differentiates UNIBLEND from other machines is its screw, which is recessed at 90 or 120° interval all along the periphery, and performs an axial stroking movement simultaneous with the rotation, completing one stroke with every revolution. Correspondingly, the barrel is fitted with four or three rows of kneading pins, which are also spaced at 90 or 120° inside the barrel, The excellent dispersion of unmeltable compounds into the molten polymer matrix is achieved due to shear generated between the flanks of the screw flights and the stationery kneading pins. The synchronous back and forth movement of the screw also provides a high degree of product exchange in the axial direction. thus producing an outstandingly ‘Uniform Blending’ over a remarkably short process length.

A significant advantage of this kneading system over twin screw is that no pressure peak or high radial pressure is generated during the kneading process. The matrix is sheared, dispersed and simply reoriented or refolded several times. This makes the UNIBLEND Kneader especially suitable for compounding of heat and pressure sensitive polymers as well as formulations containing high filler proportions or reinforcing materials like glass fibre.