RU176485U1 - Extruder for processing dissimilar secondary polymeric materials - Google Patents

Abstract

The utility model relates to the field of processing of polymeric materials by pressure and can be used in the processing of polymer waste to produce high-quality products. The device comprises a housing consisting of a supply zone, a compression zone, a dosing zone, a gripping device, an auger made prefabricated, in the supply zone the screw is made in the form of a conical section, in the compression zone - in the form of a consecutive barrier section and decompression section, in the dosing zone , the screw is made of two conical and mixing sections arranged in series, in the mixing section the body is made with transverse grooves in the form of a hexagon along the entire length of the section, located at equal distance from each other. The technical result consists in improving the extruder due to the new design of the screw in the metering zone, which ensures the production of new high-quality products by extrusion. 2 ill.

Description

The technical solution relates to the field of processing of polymeric materials by pressure and can be used in the processing of polymeric waste with obtaining high-quality products.

Known extruder for processing thermoplastics (patent UA No. 5779, publ. March 15, 2005, bull. No. 3), selected as a prototype. The extruder comprises a housing, a gripping device, an auger, a feed zone, a compression zone, which consists of a barrier section and a decompression section, a dosing zone made of successive conical and cylindrical sections

A disadvantage of the known design is that in the case of processing heterogeneous secondary polymeric materials consisting of secondary, primary raw materials, fillers, dyes and other components necessary for secondary polymeric materials (secondary polymeric mixture), a set of expensive equipment is necessary for preliminary preparation of the initial raw materials ( mixers, presses, plasticizers, granulators). The use of directly unprepared preliminary raw materials for the known design does not give good quality of the resulting secondary products due to insufficient mixing abilities of the design.

The objective of the technical solution is to improve the extruder due to the new design of the screw in the metering zone.

The essence of the technical solution: an extruder for processing heterogeneous secondary polymeric materials, including a housing consisting of a feed zone, a compression zone, a metering zone, a gripper, a screw made prefabricated, in the feed zone the screw is made in the form of a conical section, in the compression zone - in the form consecutively located barrier section and decompression section, in the metering zone, the screw is made of two conical and mixing sections in series, in the mixing section the body is made with transverse grooves in hexahedron yoke section along the entire length, spaced equidistant from each other.

The use of the claimed extruder in the processing of heterogeneous secondary polymer blends allows you to combine preparatory operations (filling, pressing, mixing, granulating) and the operation of obtaining new high-quality products by extrusion.

Common features with the prototype are:

a housing consisting of a feed zone, a compression zone, a dosing zone,

gripper

prefabricated screw

in the feed zone, the screw is made in the form of a conical section,

in the compression zone, the screw is made of two consecutively located barrier section and decompression section,

in the dosing zone contains a conical section.

Distinctive features of a technical solution are:

the auger in the dosing zone further comprises a mixing section,

in the mixing section, the housing is made with grooves in the form of a hexagon along the entire length of the section, located at an equal distance from each other.

The combination of essential features ensures the receipt of new high-quality products by extrusion.

In FIG. 1 is a perspective view of an extruder; FIG. 2 shows a view of the housing in the mixing section of the metering zone.

Extruder for processing dissimilar secondary polymeric materials. (Fig. 1) contains a housing 1, a gripping device 2, a screw 3, made in the form of a prefabricated structure. The housing consists of a feed zone 4, a compression zone 5, a metering zone 6. In the feed zone 4, the screw is made in the form of a conical section, in a compression zone 5 the screw consists of a barrier section 7 and a decompression section 8. In metering zone 6, the screw 3 is made of two consecutive parts: from the conical 9 and mixing sections 10, in the mixing section, the housing is made with transverse grooves located at equal distances from each other. In (Fig. 2), a mixing section 10 with transverse grooves in a hexagonal housing is shown, comprising transverse grooves in a hexagonal housing 11 located perpendicular to the axis of the coil 12, while the polymer melt passes from the input channel 13 to the output channel 14 through the gap between the crest of the turn and the top of the groove 15.

The extruder for processing heterogeneous secondary polymeric materials works as follows (Fig. 1).

Various polymeric materials (primary, secondary, dyes and other fillers) are supplied by separate dispensers to the gripper 2, captured by a screw 3, which rotates in the housing 1, are transported in solid form and compacted in the supply zone 4, then in the compression zone 5 in the barrier section 7, the polymer mixture is completely melted, in the decompression section of the secondary polymer melt 8 of the compression zone 5, the volatile compounds contained in the waste are removed, the conical section 9 of the metering zone 6 is determined m size and pressure stability and performance, which develops an extruder, mixing section 10 with the transverse slots in the housing in the form of hexahedron provides uniform mixing of the melt components.

For example, when making grooves with a step equal to half the step of cutting the main turn, the grooves have a depth equal to the double gap between the crest of the turn and the body, and a length equal to the length of the turn. With a smaller depth and length of the grooves, uniform mixing of small fractions of secondary polymer materials is not ensured, and with a greater depth and length of the grooves the necessary pressure is not provided in the extruder, which prevents the mixture from moving and uniform mixing of small fractions.

The use of the claimed extruder in the processing of heterogeneous secondary polymer blends allows you to combine preparatory operations (filling, mixing, granulating, pressing) and the operation of obtaining new high-quality products by extrusion.

Claims (1)

An extruder for processing heterogeneous secondary polymeric materials, including a housing consisting of a feed zone, a compression zone, a metering zone, a gripping device, a screw made prefabricated, in the feed zone the screw is made in the form of a conical section, in the compression zone the screw is made of two consecutive barrier sections and decompression sections in the dosing zone contains a conical section, characterized in that the screw in the dosing zone further comprises a mixing section in which the housing is made with grooves in the form of a pole hedron the entire length of the section, arranged at an equal distance from each other.

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