CN110927011A - On-line melt finger measuring device - Google Patents
On-line melt finger measuring device Download PDFInfo
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- CN110927011A CN110927011A CN201911204888.XA CN201911204888A CN110927011A CN 110927011 A CN110927011 A CN 110927011A CN 201911204888 A CN201911204888 A CN 201911204888A CN 110927011 A CN110927011 A CN 110927011A
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- capillary
- melt
- die head
- screw extruder
- measuring device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/08—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by measuring pressure required to produce a known flow
Abstract
The invention relates to the technical field of composite material performance testing, and discloses an online melt index measuring device which comprises a screw extruder and a die head, wherein a capillary rheological mechanism is arranged between an extrusion end of the screw extruder and the die head, and a melt in the screw extruder enters the capillary rheological mechanism under the action of extrusion pressure to perform real-time measurement on a melt index. The measurement and detection mode of the capillary rheometer is grafted to the extrusion molding equipment, so that the melt index of the high polymer material is measured in real time, and accurate data support is provided for monitoring the dispersion and extrusion stability of fillers in the filled composite material.
Description
Technical Field
The invention relates to the technical field of composite material performance testing, in particular to an online melt finger measuring device.
Background
The thermoplastic polymer material is a material suitable for thermal processing, and is melted and plasticized in the heating process to become a flowable melt, so that the special-shaped molding is realized through a mold. The single-variety high polymer material has stable rheological property, and shows stable rule along with the change of temperature, but the rheological property of the material can be changed to different degrees under different shearing acting forces. In recent years, with the improvement of requirements of people on the performance and the function of a high polymer material, more and more engineers prepare various two-phase or even multiphase composite material alloys by a blending method, and the composite materials show different rheological properties under the action of different temperature fields and shearing force fields. The fluidity of the material determines the design of the mold structure and the regulation and control method of the processing technological parameters in the molding process. Therefore, the real-time control of the processing rheological property of the high polymer material plays an important role in optimizing the production process of the product and improving the performance of the product.
Viscosity is an important component of the processing rheology of polymeric materials. At present, the test aiming at the high molecular viscosity is mostly off-line test, the mode can represent the characteristics of the material in a certain procedure, but in the processing process, the stress of the high molecular material melt is very complex, the flow form and the stress in the forming process are also different, if the viscosity of the high molecular material can be measured in real time, the processing process of the high molecular material can be better monitored, and the processing technological parameters of the material can be optimized and adjusted in real time.
Disclosure of Invention
The invention solves the technical problem of overcoming the defects of the prior art and provides an online molten finger measuring device capable of detecting the fluidity index of a high polymer material in the processing process in real time.
The purpose of the invention is realized by the following technical scheme:
an on-line melt index measuring device comprises a screw extruder and a die head, wherein a capillary rheological mechanism is arranged between an extrusion end of the screw extruder and the die head, and a melt in the screw extruder enters the capillary rheological mechanism under the action of extrusion pressure to carry out real-time measurement on a melt index.
Furthermore, the capillary rheological mechanism comprises a bypass pipe connected with the extrusion end of the screw extruder and a transition cavity arranged at the tail end of the bypass pipe, a capillary die head used for extruding the material strip is transversely connected to the transition cavity, and a laser velometer is arranged at the outlet of the capillary die head.
Furthermore, a probe of the laser velometer is fixedly arranged above the material strip at the tail end of the capillary die head.
Still further, a valve is mounted on the bypass pipe.
Still further, be provided with pressure sensor on the transition chamber and be used for monitoring fuse-element pressure.
Compared with the prior art, the invention has the following beneficial effects:
the measurement and detection mode of the capillary rheometer is grafted to the extrusion molding equipment, so that the melt index of the high polymer material is measured in real time, and accurate data support is provided for monitoring the dispersion and extrusion stability of fillers in the filled composite material.
Drawings
Fig. 1 is a schematic structural diagram of an online molten finger measuring device according to embodiment 1.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are provided for illustrative purposes only and are not intended to be limiting; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, an on-line melt index measuring device is provided, which comprises a screw extruder 1 and a die head 2, wherein a capillary rheological mechanism is arranged between an extrusion end of the screw extruder 1 and the die head 2, and a melt in the screw extruder 1 enters the capillary rheological mechanism under the action of extrusion pressure to perform real-time measurement of a melt index.
Specifically, the capillary rheological mechanism comprises a bypass pipe 3 fixedly connected to the wall of the extrusion end cylinder of the screw extruder and a transition cavity 4 arranged at the tail end of the bypass pipe, a capillary die head 5 used for extruding material strips is transversely connected to the transition cavity 4, so that melt in the transition cavity is horizontally extruded, and a laser velometer 6 is arranged at the outlet of the capillary die head 5 to measure the extrusion speed of the melt.
The probe of the laser velometer is fixed above the extruded material strip 7 at the end of the capillary die 5 so as to accurately measure the extrusion speed.
And a spiral valve 8 is arranged on the by-pass pipe 3 and used for controlling the on-off of the split flow of the melt.
In order to provide multi-directional data reference for the material performance, a pressure sensor 9 can be arranged on the transition cavity 4 for monitoring the melt pressure.
The process for testing the melt viscosity of the high polymer material by adopting the testing device is as follows: the screw valve is opened, the polymer melt enters the transition cavity through the bypass pipe under the extrusion pressure action of the screw extruder, the melt pressure entering the transition cavity is measured by the pressure sensor, the polymer melt is discharged from the capillary die head through the transition cavity and forms a material strip, the laser velometer can measure the movement speed of the polymer material strip extruded from the capillary die head in real time, the flow of the polymer material melt passing through the capillary die head can be calculated by combining the movement speed of the material strip with the size of the capillary and the melt pressure, and then the real-time apparent viscosity of the polymer melt is solved in real time.
The measuring device is simple in structure, convenient to install, capable of detecting the flowability index of the high polymer material in the processing process in real time and convenient to use.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. The device is characterized by comprising a screw extruder and a die head, wherein a capillary rheological mechanism is arranged between the extrusion end of the screw extruder and the die head, and melt in the screw extruder enters the capillary rheological mechanism under the action of extrusion pressure to perform real-time measurement on the melt index.
2. The on-line melt finger measuring device according to claim 1, wherein the capillary rheological mechanism comprises a bypass pipe connected with the extrusion end of the screw extruder, and a transition chamber arranged at the tail end of the bypass pipe, a capillary die head for extruding the material strip is transversely connected to the transition chamber, and a laser velometer is arranged at the outlet of the capillary die head.
3. The on-line molten finger measuring device of claim 2, wherein the probe of the laser velometer is fixedly arranged above the material strip at the tail end of the capillary die head.
4. The on-line molten finger measuring device of claim 3, wherein a valve is installed on the by-pass pipe.
5. An on-line melt finger measuring device as claimed in claim 4, wherein a pressure sensor is provided on the transition chamber for monitoring the melt pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204888.XA CN110927011A (en) | 2019-11-29 | 2019-11-29 | On-line melt finger measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204888.XA CN110927011A (en) | 2019-11-29 | 2019-11-29 | On-line melt finger measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110927011A true CN110927011A (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911204888.XA Pending CN110927011A (en) | 2019-11-29 | 2019-11-29 | On-line melt finger measuring device |
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| CN (1) | CN110927011A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398081A (en) * | 2020-04-23 | 2020-07-10 | 广州华新科智造技术有限公司 | Online detection device and method for melt index of high molecular polymer |
| CN117451580A (en) * | 2023-12-26 | 2024-01-26 | 中国农业科学院农产品加工研究所 | Method for analyzing extrusion stability of wiredrawing protein |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213747A (en) * | 1977-11-16 | 1980-07-22 | Werner & Pfleiderer | Method of and apparatus for controlling the viscosity of molten plastics material which is to be moulded |
| CN103149127A (en) * | 2011-12-27 | 2013-06-12 | 常州大学 | Intelligent two-way extrusion capillary rheometer |
| CN106226549A (en) * | 2016-08-30 | 2016-12-14 | 江苏新嘉理生态环境材料股份有限公司 | A kind of measurement apparatus of ceramic plate extruded velocity |
-
2019
- 2019-11-29 CN CN201911204888.XA patent/CN110927011A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213747A (en) * | 1977-11-16 | 1980-07-22 | Werner & Pfleiderer | Method of and apparatus for controlling the viscosity of molten plastics material which is to be moulded |
| CN103149127A (en) * | 2011-12-27 | 2013-06-12 | 常州大学 | Intelligent two-way extrusion capillary rheometer |
| CN106226549A (en) * | 2016-08-30 | 2016-12-14 | 江苏新嘉理生态环境材料股份有限公司 | A kind of measurement apparatus of ceramic plate extruded velocity |
Non-Patent Citations (1)
| Title |
|---|
| 周建萍 等: "《高分子材料与工程专业实验》", 31 October 2018, 北京航空航天大学出版社, pages: 3 - 5 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398081A (en) * | 2020-04-23 | 2020-07-10 | 广州华新科智造技术有限公司 | Online detection device and method for melt index of high molecular polymer |
| CN117451580A (en) * | 2023-12-26 | 2024-01-26 | 中国农业科学院农产品加工研究所 | Method for analyzing extrusion stability of wiredrawing protein |
| CN117451580B (en) * | 2023-12-26 | 2024-04-16 | 中国农业科学院农产品加工研究所 | Method for analyzing extrusion stability of wiredrawing protein |
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Application publication date: 20200327 |
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