| 摘要 |
The group of inventions relates to the production of long products out of powdered plasticized masses by means of the extrusion thereof. The technical result of the invention consists in making it possible to form long sheets out of plasticized materials, said sheets being uniform in structure and without defects. The method for forming long sheets out of plasticized powdered materials comprises: forming a blank, pressing it through a deformation channel having a round cross section at the inlet thereof and a rectangular cross section at the outlet thereof thus providing for the stretching of the material, then forming the product and calibrating same. In the process of pressing the material through the deformation channel, deformation zones are formed in said material. In the first half of the length of the deformation channel, the degree of deformation of the material in the central zone is no less than 80%, while in the peripheral zones it is no more than 20% of the overall degree of deformation undergone by the material throughout the entire length of the deformation channel. In the second half of the length of the deformation channel, at the same time as the material moves along the axis of the channel, thus decreasing the width and height of the peripheral zones, the volume of material in these zones is also decreased relative to the volume of material in the central zone by means of pressing said material back into the central zone. The device for carrying out said method comprises all the necessary deformation elements with a shaped working channel and a calibrating drawing die. |
