| 摘要 |
<p>Extrusion products such as cables, pipes, blown films etc. consisting of several material layers are generally manufactured using multilayer nozzles in which the masses are divided into several flow components, which are then merged again to produce a tubular structure. The problem with this method is that seams and stripes tend to appear where the flow components were merged. In the extrusion method of the invention, the flowing masses are homogenized by means of rotors revolving between plates placed on top of each other, the plastic masses being introduced into the rotor spaces from the rotor peripheries and passed to the circular inner edges of the rotors, from where they proceed in a tubular flow into the nozzles. The materials used in the manufacturing process, such as plastics, colours, foaming agents, gases, vulcanizing agents and other chemicals, are applied to the rotor peripheries and mixed by the rotation of the rotors, the result being a homogenous mixture and a tubular product of uniform quality.</p> |
