A single-screw extruder for the production of starch-based plastics

A single-screw extruder, starch-based plastic technology, applied in the field of extruders, can solve problems such as pressure, flow fluctuation, mixing, poor homogenization effect, etc., and achieve the effect of eliminating countercurrent, improving productivity and improving homogenization effect.

Active Publication Date: 2021-02-19
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of pressure and flow fluctuations and poor mixing and homogenization effects in the process of extruding starch base and resin melt in existing single-screw extruders

Method used

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  • A single-screw extruder for the production of starch-based plastics
  • A single-screw extruder for the production of starch-based plastics
  • A single-screw extruder for the production of starch-based plastics

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. Limitations on the Invention.

[0026] Such as figure 1 , figure 2 with image 3 As shown, the present invention is a single-screw extruder for producing starch-based plastics. The single-screw extruder includes the following modules: a hopper (1) for storing materials, a hopper (4) for plant fibers, and a screw (11), a gear pump (5) for continuously conveying a steady-pressure and steady-flow melt, a static mixer (7) for melt mixing, and a die (8) for melt molding.

[0027] Further, a single-screw extruder for producing starch-based plastics, the single-screw extruder includes the following modules: a hopper (1) for storing materials, a hopper (4) for plant fibers, and a screw for conveying materials ( 11), the gear pump (5) for continuously con...

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Abstract

The invention discloses a single-screw extruder for producing starch-based plastic. The single-screw extruder comprises the following modules including a hopper for storing starch and resin, a hopperfor plant fibers, a screw for conveying materials, a gear pump for flow stabilization of melt, a static mixer for homogenization and a nano infrared heating ring. The starch of the single-screw extruder enters a conveying section from the hopper, and enters a compression section from the conveying section under transmitting of the screw. The materials enter the gear pump from the compression section, the materials enter a suction chamber of the gear pump, along with rotation of a gear, the melt is brought into a discharge chamber from the two sides, and the melt is extruded out of the discharge chamber and sent to an outlet pipe in a pressed manner. A gear pump outlet pipe enters the static mixer. The single-screw extruder has the beneficial effects that the gear pump conveys the melt in aflow stabilizing and pressure stabilizing manner, repeated splitting and joining of the melt are carried out by the static mixer, and good homogenization of the melt is achieved. The starch-based material blending effect is improved, and the product appearance and performance stability are improved.

Description

technical field [0001] The invention relates to the technical field of extruders, in particular to a single-screw extruder for producing starch-based plastics. Background technique [0002] With the increasing awareness of environmental protection, human beings realize that the waste generated by plastic products is causing damage to the human living environment. Some countries have enacted regulations to restrict or prohibit the use of non-degradable plastics, especially disposable plastic products. Researchers have accelerated the development of biodegradable starch-based plastics because they are cheap, renewable and biodegradable. In the production of starch-based plastics, technical problems such as gelatinization, plasticization, shear kneading, and equal pressure quantitative output are encountered during the extrusion process. Therefore, the use of traditional plastic single-screw extruders is no longer suitable for the production of starch-based plastics. At home ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/285B29C48/395B29C48/37B29C48/36B29C48/505
Inventor 王建康李治建
Owner TIANJIN UNIV OF SCI & TECH
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