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Variable-diameter screw melt extruder and extrusion method thereof

A variable diameter screw and melt extrusion technology, applied in the direction of the melting of filament raw materials, can solve the problem of affecting the quality of the raw silk, affecting the uniformity of the spinning nozzle stretching, the quality of fiber forming, and the instability of melt advancement. and other problems, to achieve the effect of pre-crystallization and softening uniformity, avoiding moisture absorption and saving factory space

Inactive Publication Date: 2012-10-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tapered structure from the feed to the extrusion will cause the melt to advance unstable, which will seriously affect the quality of the raw silk; and the use of a parallel structure at the rear end of the screw can make the melt extrusion uniform, but from the diagram It can be seen that two-thirds of the entire screw section is still a conical feeding and melting section, and only one-third is a parallel extrusion section. This structure is beneficial to plastic extrusion molding.
However, for the spinning pellets or powder, the pre-crystallization and vacuum exhaust drying of the feed must be very uniform, because the pre-crystallization of the spinning raw material and the unstable fluctuation of the moisture content will inevitably affect the melt in the subsequent compression and metering section. Stability, which affects the uniformity of the spinneret drawing and the quality of fiber formation
It is difficult for the existing technology to ensure that the drying and pre-crystallization of the raw materials are carried out uniformly during the extrusion process while ensuring that the moisture in the raw materials can be fully removed. However, this patented technology can effectively solve this problem in the prior art and can meet the requirements of plastic extrusion at the same time. and spinning requirements

Method used

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  • Variable-diameter screw melt extruder and extrusion method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Using a variable-diameter screw extruder and extrusion method, PET (polyethylene terephthalate) pellets with a melting point of 265 ° C and a moisture content of 105 ppm are melt-extruded, and the conical cylinder The angle range of the outer cone angle is 20 degrees, the pre-melting exhaust zone accounts for 15% of the entire screw, the pre-crystallization drying zone accounts for 40% of the total screw length, and the melting zone accounts for 10% of the total screw length; the feed pre-crystallization drying The temperature of the pre-melting exhaust gas is controlled at 100-130 °C, and the temperature of the pre-melting exhaust gas is controlled at 260 °C; the diameter ratio of the cylinder body in the feed pre-crystallization drying zone to the cylinder body in the melting zone is 3:1; the cone in the pre-melting exhaust area 16 air outlets are installed on the cylinder, and the air outlet aperture is 12mm, and the air outlet is connected with a vacuum device, and t...

Embodiment 2

[0026] Using a variable-diameter screw extruder and extrusion method, melt-extrude PBT (polybutylene terephthalate) pellets with a melting point of 260°C and a moisture content of 80ppm. The angle range of the outer cone angle is 10 degrees, the pre-melting exhaust area accounts for 13% of the entire screw, the pre-crystallization drying area accounts for 40% of the total screw length, the melting area accounts for 15% of the total screw length, and the feed pre-crystallization drying The temperature of the pre-melting exhaust is controlled at 255±2°C; the diameter ratio of the cylinder in the feed pre-crystallization drying zone to the cylinder in the melting zone is 2:1; the pre-melting exhaust The conical cylinder body in the zone is equipped with 8 exhaust ports, and the aperture of the exhaust ports is 6mm, and the moisture content of PBT obtained at the mouth of the melting extruder is 23ppm.

Embodiment 3

[0028]Using a variable-diameter screw extruder and extrusion method, melt-extrude PTT (polytrimethylene terephthalate) pellets with a melting point of 255°C and a moisture content of 70ppm, wherein the outer cone of the conical cylinder The angle range is 3 degrees, the pre-melting exhaust zone accounts for 10% of the entire screw, the pre-crystallization drying zone accounts for 30% of the total screw length, the melting zone accounts for 15% of the total screw length, and the feed pre-crystallization drying temperature Control at 120-140°C, and control the temperature of pre-melting air extraction at 245±2°C; the diameter ratio of the cylinder in the feed pre-crystallization drying zone to the cylinder in the melting zone is 1.5:1; the conical cylinder in the pre-melting exhaust zone 4 air outlets are installed on the cylindrical body, the aperture of the air outlet is 8mm, and the air outlet is connected with a vacuum device, and the moisture content of the PTT obtained at t...

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Abstract

The invention provides a variable diameter screw melt extruder and an extrusion method thereof, and especially to a one-piece variable diameter screw melt extruder and an extrusion method thereof The one-piece variable diameter screw melt extruder is divided into four sections, i.e., from front to back, a feed pre-crystallizing drying zone, a premelting exhausting zone, a melting zone and a compression metering zone, wherein the shells of the feed pre-crystallizing drying zone, the melting zone and the compression metering zone are cylindrical, the shell of the premelting exhausting zone is conical, and the shell diameter of the melting zone and the shell diameter of the compression metering zone are identical but are smaller than the shell diameter of the feed pre-crystallizing drying zone. Feed pre-crystallizing drying temperature is controlled to be 100 to 180 DEG C lower than the melting point of a raw material, and premelting air-exhausting temperature is controlled to be 3 to 20 DEG C lower than the melting point of the raw material. According to the invention, in the process of extrusion, uniform drying and pre-crystallization of the raw material are realized while moisture in the raw material is fully drained; extrusion of plastics can be realized without huge drying equipment; and the extruder is especially applicable to melt spinning.

Description

technical field [0001] The invention relates to a variable-diameter screw melting extruder and an extrusion method thereof, in particular to an integrated variable-diameter screw extruder and an extrusion method thereof. Background technique [0002] In the process of polymer processing, the presence of moisture in many high polymers will seriously affect the mechanical properties of materials. Therefore, it is necessary to dry the raw materials before the screw extruder. The drying of raw materials takes up space, causing energy, Waste of space, manpower and other resources. [0003] In order to remove the moisture in the raw material, relevant researchers have designed a conical screw extruder. The conical screw extruder can effectively avoid the installation of drying devices, and can also achieve other excellent effects. In patent 200820083445, it is mentioned that two conical screws rotate in the same direction in the barrel to make the plasticization of raw materials...

Claims

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Application Information

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IPC IPC(8): B29C47/60B29C47/66B29C47/92D01D1/04B29C48/52B29C48/92
CPCB29C47/6025B29C47/6012B29C48/92B29C2948/924B29C48/52B29C48/535B29C2948/92019B29C2948/92514B29C2948/92895
Inventor 倪建华王依民朱卫彪邹黎明王燕萍甘海啸
Owner DONGHUA UNIV
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