SU967851A1 - Extruder - Google Patents

Description

(54) EXTRUDER

The invention relates to the processing of polymeric materials, namely, to extruders, and can be named in the PLP device to achieve a high degree of chemical properties in the chemical industry.

A fox extruder is known for processing, polymeric materials in which extrusion processes occur under the influence of a rotating disk and which comprise the casing and the disk contained therein associated with a rotating drive.

The disadvantages of this extruder are the distribution of the material in concentric circles, the difference in shear rates in the areas of the disk with different radii, which can lead to mechanical destruction of the polymer in the peripheral areas of the disk and the inefficiency of extrusion processes in the areas of the sheet with small radii, the inefficiency of the displacement processes when discs with a small diameter, as the residence time of the material in the gap between the discs is reduced while reducing the path of movement of the polymer radially. In addition, these

extruders develop low melt pressure at the extruder outlet,

The closest in technical essence and the achieved result to the invention is an extruder, comprising a housing with a feed funnel and a conveyor screw, a disk head, in the cavity of which is mounted to form

10 gaps for the passage. Material disk connected to the input shaft. In an extruder, under the influence of a conveying screw, high-pressure polymer is transported through a disk head 1.2.

A disadvantage of the known extruder is the low mixing efficiency of the material due to the heterogeneity of shear rates of the material being processed, since the disk rotates around the central axis in the extruder. The low efficiency of mixing 1: 1 reduces the quality of products.

25

The purpose of the invention is to improve the quality of products due to the intensification of the extrusion and mixing of the material.

Claims (2)

This goal is achieved by the fact that 30 in an extruder, comprising a housing with a feed funnel and a conveyor screw, a disk head, in the cavity of which the disk connected to the drive shaft is mounted with the formation of gaps for the passage of material, the disk is equipped with double cranks mounted eccentrically in the holes, which are made in the disk, with one of the cranks connected to the drive shaft. In the resulting mechanism, the articulated four-link, namely, the spherical parallelogram, the disk, being a connecting rod, has the possibility of translational motion along a given trajectory. The proposed extruder has a higher plasticity and PM shivaniya opportunities. This is due to the fact that all points of the disk describe the same trajectories of the circles and have the same speeds and. acceleration at every moment in time. Thus, during operation, the disc creates a uniform field of shear rates of the material being processed / i.e. The entire working surface of the disk is used with the same efficiency. Such a movement of the disc allows high shear rates to be obtained as the rotational portion of the drive crank increases. A higher mixing and homogenization effect is achieved by ensuring that TvsHoroKpaTHHM intersects the paths of the disk points and, consequently, the melt that they move. FIG. 1 shows the constructive scheme of the extruder, the cut; FIG. 2 is a cross section L-A in FIG. 1. The extruder comprises a housing 1 with a load funnel 2 and a disk head 3 having a central hole 4 for melting point, a transporting screw 5, a disk b mounted on cranks 7 and 8 mounted eccentrically in the holes that fulfilled, in disk b ,. one of the cranks 8 is connected by a drive shaft (not shown). The disk b is mounted in the disk head 3 with the formation of gaps 9-11 for the passage of material. The extruder works in the following way. The granulated polymer enters the feed funnel 2 and under the action of the rotating conveyor screw 5 in a pre-plasticized state under pressure enters the gap 9 and then moves through the gaps 10 and 11 to the central outlet 4. In the gaps 11 and 9 under the action of the translational movement of the cranks moved 7 and 8 of disk 6, the final heating of the polymer to the subsurface and the temperature, mixing and homogenization of the melt takes place. The interaction of the cylindrical surface of the disk 6 and cylindrical. The surface of the cavity of the disk head 3 contributes to the fragmentation of material particles when the gap 10 changes from a larger value to less. The temperature and the degree of melt displacement are controlled by changing the frequency of rotation of the drive crank 8. The use of the invention allows to intensify the process of melt mixing. Claims of the Invention An extruder comprising a housing with a feed funnel and a conveyor screw, a disc head, in the cavity of which a disc connected to a drive disk is mounted to form gaps for the passage of material. The shaft is characterized in that, in order to improve the quality of products by intensifying the processes of extrusion and mixing of the material, the disk is equipped with two cranks mounted eccentrically in holes that are made in the disk, one of the cranks being connected to the drive shaft. Sources of information taken into account in the examination 1. USSR author's certificate 286205, cl. B 29 F 3/012, 1969. 2. USSR author's certificate 441158, cl. B 29 F 3/012, 1972 (prototype) .. If