CN100480673C - On-line type polymer double-capillary extrusion rheometer - Google Patents
On-line type polymer double-capillary extrusion rheometer Download PDFInfo
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- CN100480673C CN100480673C CNB200510047712XA CN200510047712A CN100480673C CN 100480673 C CN100480673 C CN 100480673C CN B200510047712X A CNB200510047712X A CN B200510047712XA CN 200510047712 A CN200510047712 A CN 200510047712A CN 100480673 C CN100480673 C CN 100480673C
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Abstract
The present invention relates to an on-line polymer double-capillary extrusion rheometer, belonging to the field of polymer rheo-testing technology. It is characterized by that said rheometer is formed from connecting tube, base seat, regulating bolt, pressure/temperature sensor, temperature control device, balance, extrusion expansion measuring device, casement plate, capillary and setting plate. Said invention also provides the working principle of said rheometer.
Description
Technical field
The invention belongs to the polymer rheology technical field of measurement and test, specially refer to the online kapillary squeezing rheometer that a kind of characterize polymers is extruded wall slip speed and stable state rheological behaviour.
Background technology
Measuring the flow graph of polymeric rheology performance, is the experimental apparatus of investigation of materials and plastic processing indispensability.At present, commonly used is the off-line type flow measurement, and wherein capillary rheometer is most widely used.But when being to use the off-line type capillary rheometer to carry out the polymeric rheology performance measurement, the rheological parameters that processing conditions is measured because it loses contact with reality, limited to the directive function of the polymer processing of reality.In order from record pressure reduction, to obtain the pressure gradient on the complete development zone accurately, need carry out Bei Geli and proofread and correct.When apparent flowing experiment curve plotting, the relation that viscosity depends on shear rate is left in the basket, and need carry out thunder and proofread and correct than Novi thatch.For the polymkeric substance of filler systems, sliding phenomenon can take place at the capillary wall place in plastic melt, need proofread and correct.Present capillary rheometer does not carry out Bei Geli and Lei Bi Novi thatch is proofreaied and correct, and does not consider wall slip speed, and measurement result and actual process have certain gap.The polymer wall sliding velocity can't be verified and measure to traditional flow graph, and this parameter has significant effects for the numerical simulation of plastic melt Extrusion Flow analysis.At present during numerical simulation, often wall slip speed is made as zero, the hypothesis of this boundary condition has directly influenced the accuracy of flow analysis.
Extrusion die is the key equipment of the whole extrusion of plastic melt, and itself and extruder parameter, material behavior, process conditions have certain dependence and adaptability.During extrusion die design at present, owing to consider that aspects such as extruder, material and technology are few, even consider to some extent, but, make extruded product not reach quality requirements because newly-designed mould is installed to (different extruder parameter, material property and technological parameters) under the new condition of work.So just need continuous adjusting process parameter and repair a die, take time and effort.Repair a die according to statistics, time of die trial and technological parameter adjustment accounts for that extrusion die is whole to manufacture and design 30%～40% of the cycle, caused die cost significantly to increase like this, had influence on further developing of extrusion die.
Summary of the invention
The object of the present invention is to provide a kind of online polymkeric substance double capillary squeezing rheometer, be used for directly measuring polymer melt and extrude wall slip speed and stable state rheological behaviour, the result of measurement can directly instruct the process of polymkeric substance.
Technical scheme of the present invention is a kind of online polymer capillary squeezing rheometer, mainly is made up of connecting pipe, base, adjusting bolt, pressure, temperature control equipment, balance, extrusion swelling measurement mechanism, mouth template, kapillary, backing plate.This flow graph adopts and makes up the formula structure of inserting, and adopts stepped hermetically-sealed construction between base, backing plate and the mouth template.This flow graph not only can be installed in ring flange between extruder and the extrusion die by connecting pipe, and can be installed on extruder or the extrusion die.The polymer melt of fusion enters the inside die cavity of base and backing plate formation by connecting pipe under the effect of pressure, enter the kapillary that is assemblied on the mouth template then, extrudes from capillary exit at last.Be installed in the pressure and the flow of the adjusting bolt telomerized polymer melt on the base; The kapillary that is installed in mouth template can be changed according to measuring needs, and can carry out the conversion of list/double capillary; The melt pressure sensor that is installed in the place, capillary inlet also has the function of measuring temperature simultaneously, is a Pressure/Temperature integrated-type sensor, has the computing machine communication interface, is used for measuring the pressure and temperature of polymer melt at extrusion; Temperature control equipment is installed on the mouth template, is controlled at polymer melt and keeps stationary temperature in extrusion; The extrusion swelling measurement mechanism is installed in exit capillaceous, measures the polymer-extruded ratio that swells; The flow of the polymer-extruded process of balance measurement of capillary end.This flow graph also comprises computing machine, can fall the pressure that synchronization is gathered the temperature of plastic melt and capillary inlet and carry out data processing and calculating, obtains polymer-extruded wall slip speed and steady-state flow characteristics parameter.
Change different kapillaries according to the needs that polymer melt is measured.According to the Mooney theory, employing diameter difference, the double capillary that length-diameter ratio is identical, whether the checking polymer melt is extruded the wall slip phenomenon and is existed, and measures the size of polymer-extruded wall slip speed.
Use single kapillary, adopt replacing diameter one group of mode capillaceous identical, that length-diameter ratio is different to carry out Bei Geli and proofread and correct.Use single kapillary can online measurement and the conventional kapillary of characterize polymers and compound substance thereof extrude rheology characteristic and behavior, be based upon under the different technology conditions database of different extruded material rheological properties.
Regulate the pressure of capillary inlet according to the needs that polymer melt is measured by regulating bolt, thereby the shear rate of polymer melt extrusion is controlled in the suitable scope.
Effect of the present invention and benefit are: the mode that adopts online measurement, and can carry out Bei Geli and the thatch correction of Lei Bi Novi, measure the polymkeric substance stable state more exactly in real time and extrude rheology characteristic, substituted the off-line type flow measurement that breaks away from the laboratory that produces, measured data more can accurately be used to estimate the processing characteristics of polymer melt, thereby are used for instructing the adjustment and the Mould design of polymer melt working process parameter; The application of the invention is based upon under the different technology conditions, and the database of the rheological property of different extruded materials solves the dependency problem of extrusion die to extruder, material and this three of technology; For the polymkeric substance of filler systems, sliding phenomenon can take place at the capillary wall place in plastic melt, when the present invention adopts double capillary to extrude, can measure polymer-extruded wall slip speed, solve the problem that is provided with of boundary condition when plastic melt flows finite element analysis in the extrusion die, promote further developing of extrusion die CAE technology.
Description of drawings
Fig. 1 is the structural representation of online polymkeric substance double capillary squeezing rheometer.
Among the figure: 1 connecting pipe; 2 bases; 3 regulate bolt; 4 pressure; 5 temperature control equipments; 6 balances; 7 extrusion swelling measurement mechanisms; 8 mouth templates; 9 kapillaries; 10 backing plates.
Fig. 2 is the principle of work block diagram of flow graph of the present invention.
Among the figure: the Q volumetric flow rate; Δ P pressure falls; The L/D length-diameter ratio; η viscosity;
Shear rate; The τ shear stress; u
sWall slip speed.
Embodiment
Following technical scheme as a result and accompanying drawing are described in detail most preferred embodiment of the present invention.
Measure polymeric material PVC stable state when 200 ℃ of temperature and extrude rheological charactristics and wall slip speed, the embodiment step is as follows:
Step 1. is earlier blocked a kapillary with chock and is used single capillary, and flow graph is installed on the ring flange between extruder and the extrusion die, regulates temperature control equipment and temperature is controlled at measures in the required temperature range;
Step 2. starts extruder, according to measuring the expressing technique parameter need be set, and carries out PVC and extrudes flow measurement;
Step 3. adopts one group of kapillary of same diameter, different length-diameter ratios respectively by regulating the regulating action of bolt, and the pressure of measuring under identical volumetric flow rate falls, and carries out Bei Geli then and proofreaies and correct;
Step 4. is handled and is calculated the data of gathering by computing machine, and carries out thunder and proofread and correct than Novi thatch, and the stable state that obtains the PVC melt is extruded the rheology characteristic parameter;
Step 5. is taken out the double capillary that chock uses different-diameter, identical length-diameter ratio, measures volumetric flow rate capillaceous under the different pressures condition;
Step 6. is handled and is calculated the data of gathering by computing machine, obtains the wall slip speed of PVC melt under the different pressures condition.
Claims (2)
1. online polymkeric substance double capillary squeezing rheometer, comprise connecting pipe (1), base (2), regulate bolt (3), pressure and temp integrated-type sensor (4), temperature control equipment (5), balance (6), extrusion swelling measurement mechanism (7), mouth template (8), kapillary (9) and backing plate (10), it is characterized in that: adopt and make up the formula structure of inserting, adopt stepped hermetically-sealed construction between base, backing plate and the mouth template; The kapillary that is installed in mouth template carries out the conversion of list/double capillary according to measuring needs; Regulate the pressure and the flow of bolt telomerized polymer melt, make the shear rate of polymer melt extrusion satisfy suitable measurement range; The pressure and temp integrated-type sensor at place, capillary inlet is measured the pressure and temperature of polymer melt in extrusion in real time; Temperature control equipment control polymer melt on the mouth template keeps measuring required temperature in extrusion; The extrusion swelling measurement mechanism at capillary outlet place is measured the polymer-extruded amount of swelling;
When using single capillary, adopt one group of kapillary of same diameter, different length-diameter ratios respectively, the pressure of measuring under identical volumetric flow rate falls, and carries out Bei Geli and proofreaies and correct; By computing machine the data of gathering are handled and calculated, and carry out thunder and proofread and correct than Novi thatch, the stable state that obtains melt is extruded the rheology characteristic parameter; When using double capillary, adopt the double capillary of different-diameter, identical length-diameter ratio respectively, measure volumetric flow rate capillaceous under the different pressures condition; By computing machine the data of gathering are handled and calculated, obtain the wall slip speed of melt under the different pressures condition.
2. a kind of online polymkeric substance double capillary squeezing rheometer according to claim 1 is characterized in that the different kapillary of measuring according to polymer melt of needs replacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510047712XA CN100480673C (en) | 2005-11-12 | 2005-11-12 | On-line type polymer double-capillary extrusion rheometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510047712XA CN100480673C (en) | 2005-11-12 | 2005-11-12 | On-line type polymer double-capillary extrusion rheometer |
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| Publication Number | Publication Date |
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| CN1773245A CN1773245A (en) | 2006-05-17 |
| CN100480673C true CN100480673C (en) | 2009-04-22 |
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| CNB200510047712XA Expired - Fee Related CN100480673C (en) | 2005-11-12 | 2005-11-12 | On-line type polymer double-capillary extrusion rheometer |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532939B (en) * | 2009-04-08 | 2011-04-27 | 大连理工大学 | Device and method for measuring steady-state extrusion viscous dissipation of micro-scale polymer fused mass |
| CN102323186B (en) * | 2011-05-25 | 2013-05-01 | 湖南工业大学 | Method for measuring fluid shear stress in capillary and device |
| CN102507383B (en) * | 2011-11-02 | 2014-06-11 | 华南理工大学 | Capillary rheometer and method for measuring rheological properties of polymer materials |
| CN102854093B (en) * | 2012-10-11 | 2015-06-17 | 北京理工大学 | Method for measuring rheological properties of sensitive medicine material |
| US9557258B2 (en) * | 2012-12-20 | 2017-01-31 | Danmarks Tekniske Universitet | Fluid composition analysis device and method |
| US9513272B2 (en) | 2013-03-15 | 2016-12-06 | National Oilwell Varco, L.P. | Method and apparatus for measuring drilling fluid properties |
| CN103353433B (en) * | 2013-07-03 | 2016-01-06 | 天津大学 | The method of testing of the sliding length of a kind of superpolymer dynamic rheological property condition lower wall |
| CN103543088A (en) * | 2013-09-03 | 2014-01-29 | 天津大学 | Test method for rheological property of fiber-grade nylon 6 slice melt |
| DE102016201537B4 (en) * | 2016-02-02 | 2019-05-02 | Leistritz Extrusionstechnik Gmbh | rheometer |
| CN106248525A (en) * | 2016-09-27 | 2016-12-21 | 华南理工大学 | The flow measurement device of a kind of accurate flow control and measuring method |
| CN107917857B (en) * | 2017-10-23 | 2020-10-16 | 常州大学 | Radial capillary rheometer |
| CN108709828B (en) * | 2018-03-30 | 2023-09-29 | 四川大学 | Rotary extrusion processing rheometer capable of simultaneously measuring polymer pressure and/or shear rheology and rheometry method |
| CN110455684A (en) * | 2019-07-31 | 2019-11-15 | 湖南工业大学 | A kind of online rheological behavior test device of non-newtonian fluid |
| CN114088578A (en) * | 2021-10-21 | 2022-02-25 | 华南理工大学 | Rheometer and testing method for supercritical gas and polymer melt mixture |
| CN115718040A (en) * | 2022-10-28 | 2023-02-28 | 南方电网科学研究院有限责任公司 | Method and device for evaluating and optimizing continuous extrusion processing characteristics of high-voltage cable insulating material |
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Owner name: DALIAN UNIVERSITY OF TECHNOLOGY MOLD RESEARCH CO., Free format text: FORMER OWNER: DALIAN UNIVERSITY OF TECHNOLOGY Effective date: 20091002 |
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Effective date of registration: 20091002 Address after: No. 2, Ling Gong Road, Ganjingzi District, Liaoning, Dalian Patentee after: Dalian Engineering Mould Research Institute Co Ltd Address before: No. 2, Ling Gong Road, Ganjingzi District, Liaoning, Dalian Patentee before: Dalian University of Technology |
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