METHOD FOR MAKING A PRODUCT TO BE EXTRUDED, AND AN EXTRUDER

摘要

The invention relates to a method for making a product to be extruded, and an extruder. The extruder comprises at least two conical stators (1, 2) and at least one conical rotor (3) placed rotatably between the stators. The extruder further comprises supply conduits (6, 7) for feeding the material to be extruded separately into the exterior and interior of the rotor (3). Each supply conduit (6, 7) is provided with a separately adjustable feeding device (9, 10) by means of which the amount of the material flow to be supplied can be adjusted. In such a case, the degree to which the space between the rotor (3) and the stator (1, 2) is filled and the amount of the heat generated by the friction can be regulated. Further, the ratio of the material flows in the different supply conduits (6, 7) determines the ratio of the thicknesses of the layers obtained. Therefore, the method and apparatus according to the invention make it possible to regulate the properties of the final product easily and in several different ways.