RU185865U1 - 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 includes a housing consisting of a feed zone, a compression zone, a metering zone, a gripping device, an auger made prefabricated, in the feed 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, and in the zone dosing screw is made of two conically arranged conical and mixing sections with radial barrier partitions on the side surface of the screw, located at an equal distance from each other, the partitions have a height, ra 0.5 hydrochloric coil height and a width equal to the width of the coil 0.5. The technical result is to ensure the processing of heterogeneous secondary polymer mixtures, which allows you to combine preparatory operations (filling, mixing, granulating, pressing) and the operation of obtaining 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 metering zone made of successive conical and cylindrical sections.

A disadvantage of the known construction 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 initial raw materials (mixers , press, 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 of sequentially located barrier section and decompression section, and in the metering zone, the auger is made of two consecutive conical and mixing sections with radial barrier partitions on the side The surface of the screw located at an equal distance from each other, the partitions have a height equal to 0.5 of the height of the turn, and a width equal to 0.5 of the width of the turn. With a smaller height and width of the partitions, uniform mixing of small fractions of secondary materials is not provided, and with a greater height and width of the partitions, it is possible to create critical speeds and shear deformations of materials, which can lead to its destruction.

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 auger is made in the form of successively arranged barrier sections and decompression sections.

Distinctive features of the device are:

auger in the metering zone, the auger is made of two conically located conical and mixing sections with radial barrier partitions on the side surface of the auger,

the partitions are located at an equal distance from each other,

the partitions have a height equal to 0.5 of the height of the turn,

the partitions have a width equal to 0.5 of the width of the turn.

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.

The extruder for processing heterogeneous secondary polymeric materials (Fig. 1) comprises 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 conical 9 and mixing section 10 with barrier radial partitions on the side surface of the screw. In (Fig. 2), a mixing section 10 is presented, containing barrier radial partitions 11, on the side surface of the screw, arranged arcuate to the turn of the screw 12, while the melt passes through the gap between the partitions and the housing 13, undergoing high shear deformations.

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

Various polymeric materials (primary, secondary, dyes, and other fillers) are fed 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 of 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 Since the extruder develops due to the configuration of the screw and the pressure stability and productivity, the mixing section 10 with barrier radial partitions on the side surface of the screw of the metering zone 6 ensures uniform mixing of the melt components.

Example. With a screw channel depth of 2 mm and a coil width of 2 mm, the radial barrier partitions have a height of 1 mm and a width of 1 mm. The design dimensions of the screw will be measured with a digital vernier caliper with an accuracy of 0.01 mm.

The design of the auger in the dosing zone containing the mixing section with barrier radial partitions on the side surface of the auger, with the stated parameters, provides better mixing of the filler with secondary polymeric materials.

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, characterized in that the screw in the dosing zone is made of two consecutive parts: from a conical and mixing section with radial barrier partitions on the side surface These screws located at equal distance from each other, the partitions placed in an arcuate manner to the turn of the screw of the partition have a height equal to 0.5 of the height of the turn, and a width equal to 0.5 of the width of the turn, forming a gap between the partitions and the body.

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