SU513876A1 - Disk extruder - Google Patents

Description

one

The invention relates to the field of processing thermoplastic materials and is intended for use in non-worm extruders, blown aggregates, injection molding machines with disk pre-plastics and calender lines.

A disk extruder is known, which contains a codCus supplied with a feed funnel and a forming head and a rotating disk, on the side surface of which a screw / cut is cut with a decrease in the extrusion direction. The performance of a known extruder is low and narrow the range of processed materials.

In the extruder according to the invention, the housing is provided with the central and conical sections forming a working gap with the disk, extending from the hopper to the end of the cylindrical section of the body and tapering at the conical section, and the maximum height of the gap does not exceed the maximum screw height of the disk.

Pa figs. 1 shows an extruder, a general sectional view; in fig. 2 is a section along A-A in FIG. one.

The disk extruder comprises a stationary body 1 with a hopper 2 and a die 3 and a rotating disk 4 s.

cutting 5, the height of which is reduced to the extrusion direction of the material,

The housing 1 is made with cylindrical and co-steps and forms with a 4-disk which is from the boot into the working gap a, the cylindrical section of the rim to the end

the body is gradually widened, and then gradually tapered in the conical section in the direction of material extrusion, while the flow area of the gap at the entrance to its front part is smaller than its section in the loading zone, and the maximum height of the gap does not exceed the maximum screw thread of the disk.

Job

The extruder is as follows.

From the feed hopper 2, the material enters the working gap, where it is picked up by a screw thread of a rotating disk, heated, plasticized, homogenized, and squeezed through the forming head 3.

Due to the presence of the gap in the working gap, the material in it is subjected to intensive influence by the vortex planetary motion, the stability of which in a wide range of conditions (during the processing of various thermoplastics) is provided by pulses of radial velocity created by the rotation of the rotating disk due to art.

asymmetry in the distribution of shear rates in this expansion. Fresh portions of the material are mixed with dvigush, imis vortexes, speed: the planetary movement of which is less than the linear speed of the contact surface of the turning disk, and, taking some of the heat generated by the vortex, are heated and melted to the desired initial temperature.

In addition to pre-mixing and heating the material, the vortices play the role of an intermediate storage system, which is necessary for drying, maintaining a continuous plasticization process, accumulate an excess of the supplied material, and then gradually expend it in the event of a power failure. This makes it possible to significantly increase productivity and expand the range of materials processed on the same working bodies.

Claims (1)

4 claims A disk extruder, a housing equipped with a feed funnel and a die-shaped head and a rotating disk, on the side surface of which a screw is cut with a decrease in the height direction in extrusion, characterized in that, in order to increase productivity and expand the range of processed polymers, the housing is cylindrical and conical areas forming with the disk working gap widening in the area from the hopper until the end of the cylindrical section of the housing and tapering on the conical section, the maximum gap height does not exceed the maximum height of the screw thread of the disk.