A single-screw plasticizing extruder

An extruder and single-screw technology, applied in the field of polymer material processing and molding equipment, can solve the problems of inability to match the solid conveying efficiency with the melt conveying efficiency, restricting the application range of the single-screw extruder, and low melting and plasticizing efficiency. , to achieve the effect of increasing the maximum shear rate, simple structure and improving plasticizing efficiency

Active Publication Date: 2019-03-26
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting and plasticizing efficiency of conventional single-screw extruders is low, which cannot match the solid delivery efficiency and melt delivery efficiency, which has restricted the application range of single-screw extruders for a long time

Method used

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  • A single-screw plasticizing extruder
  • A single-screw plasticizing extruder
  • A single-screw plasticizing extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The single-screw plasticizing extruder provided in this embodiment, Shape helicoid 221 expands along its helical direction and the trajectory on the same plane satisfies the following function:

[0045] y=a sin(πb x)

[0046] Wherein, the direction of the helical expansion line 222 is the direction of the x-axis, the direction perpendicular to the helical expansion line 222 is the direction of the y-axis, a is 0.1D, b is 5 / D, and D is the nominal diameter of the screw 2. The screw of this embodiment The nominal diameter D is 65mm.

[0047] The screw groove depth of the solid conveying section 21 is 6.5mm, the screw groove depth of the melt conveying section 23 is 3mm, and the thread lead angles of the solid conveying section 21 and the melt conveying section 23 are both 17°42'; the screw groove of the melting section 22 The groove depth gradually decreases from 6.5mm at the front end to 3mm at the rear end along the axis of the screw 2, and the melting section The ...

Embodiment 2

[0051] The difference between the single-screw plasticizing extruder in this embodiment and the single-screw plasticizing extruder in Embodiment 1 is that Shape helicoid 221 expands along its helical direction and the trajectory on the same plane satisfies the following function:

[0052] y=a sin(πb x)

[0053] Wherein, the direction of the helical expansion line 222 is the direction of the x-axis, the direction perpendicular to the helical expansion line 222 is the direction of the y-axis, a is 0.15D, b is 3 / D, and D is the nominal diameter of the screw 2. The screw of this embodiment The nominal diameter D is 90mm.

[0054] The screw groove depth of the solid delivery section 21 is 9mm, the screw groove depth of the melt delivery section 23 is 4mm, and the screw lead angles of the solid delivery section 21 and the melt delivery section 23 are both 17°42'; the depth of the screw groove of the melting section 22 is determined by The 9mm of its front end gradually decreases ...

Embodiment 3

[0058] Compared with the single-screw plasticizing extruder in Embodiment 1, the single-screw plasticizing extruder in this embodiment is different in that, Shape helicoid 221 expands along its helical direction and the trajectory on the same plane satisfies the following function:

[0059] y=a sin(πb x)

[0060] Wherein, the direction of the helical expansion line 222 is the direction of the x-axis, the direction perpendicular to the helical expansion line 222 is the direction of the y-axis, a is 0.25D, b is 2 / D, and D is the nominal diameter of the screw 2. The screw of this embodiment The nominal diameter D is 70mm.

[0061] The screw groove depth of the solid delivery section 21 is 7mm, the screw groove depth of the melt delivery section 23 is 3.5mm, and the thread angles of the solid delivery section 21 and the melt delivery section 23 are both 17°42'; the melting section 22 screw groove depth From the 7mm of its front end to the 3.5mm of its rear end along the axial d...

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Abstract

The invention relates to polymer material processing and forming equipment, and discloses a single-screw plasticizing extruder. The single-screw plasticizing extruder comprises a shell, a driving device, a screw, a machine barrel and a heating and cooling device. The machine barrel is arranged on the shell. The screw is nested into the machine barrel. The screw comprises a solid conveying section, a melting section and a melt conveying section which are connected in sequence. The output end of the driving device is connected with the outer end of the solid conveying section. The heating and cooling system is used for adjusting the temperature of the machine barrel. A feeding inlet is formed in the upper portion of the end, where the solid conveying section is located, of the machine barrel. A discharging outlet is formed in the end, where the melt conveying section is located, of the machine barrel. The melting section is provided with inverted-S-shaped screw flights. According to the single-screw plasticizing extruder, the melting length of a material on the screw within a single guide stroke is increased, and plasticizing efficiency of the material on the melting section of the screw is improved; the length-to-diameter ratio of the melting section of the screw is decreased, and manufacturing cost is reduced; and the single-screw plasticizing extruder has the advantages that pressure build-up capacity is high and the pressure peak in the screw appears on the melting section, and therefore the material can be better extruded more stably.

Description

technical field [0001] The invention relates to a polymer material processing and molding equipment, in particular to a single-screw plasticizing extruder. Background technique [0002] Single-screw extrusion molding has the advantages of strong pressure building ability, strong adaptability, good stability and wide application, and is suitable for processing almost all polymer materials. The screw extruder can concentrate a series of chemical basic unit processes, such as solid conveying, melting, foaming, grafting, melt conveying and pumping and other physical and chemical processes on the screw in the extruder. Solid plastic granules or powder are compressed on the screw, melted and plasticized, mixed and extruded to the molding head for finalization to obtain finished products or semi-finished products. Studies have shown that the melting and plasticizing ability of the screw directly affects the quality of extruded products, and the plasticizing quality and output are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/285B29C48/505B29C48/395
CPCB29C48/397B29C48/505B29C48/59
Inventor 贾明印陈轲薛平金葵黄勇
Owner BEIJING UNIV OF CHEM TECH
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