| 摘要 |
<p>An extrusion method and an extrusion device, whereby at least two different flows of material are supplied from the extrusion device (1) to a nozzle (7). The nozzle (7) comprises at least two nozzle chambers (13, 14) such that the material flowing through the first nozzle chamber (13) forms an outer part (15a) of a product (15), and the material flowing through the second nozzle part (14) forms an inner part (15b) of the product (15). The capacity of the nozzle chambers (13, 14) is changed, whereby the relative proportion of the different parts (15a, 15b) of the product (15) can be varied. When the capacity of the nozzle chamber (13, 14) is decreased, the amount of material flowing therethrough increases at the outlet of the nozzle (7), and when the capacity of the nozzle chamber (13, 14) is increased, the amount of material flowing out therethrough decreases at the outlet of the nozzle (7).</p> |
