• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A measuring nozzle for determining the extensional viscosity of polymer melts during their processing with a flow channel having a rectangular cross-section is provided, which has a transition section (3) between an inlet section (1) and an outlet section (2) of constant cross section, respectively, between two opposite channel walls (6 and 7) in the flow direction (8) hyperbolic tapers. In order to provide advantageous measuring conditions, it is proposed that the transition section (3) an inlet-side zone (4) in which the mutual distance between the two channel walls (7) between the two hyperbolic channel walls (6) in the flow direction (8) steadily decreases, and an adjoining outflow-side zone (5), in which two of the pairwise opposite channel walls (6, 7) parallel to each other, while the two interposed channel walls (7) in the flow direction (8) hyperbolic converge.
    公开号:AT517311A1
    申请号:T50465/2015
    申请日:2015-06-08
    公开日:2016-12-15
    发明作者:Jürgen Dipl Ing Dr Mba Miethlinger；Bernhard Mag Löw-Baselli；Hans Jürgen Dipl Ing Luger
    申请人:Universität Linz；
    IPC主号:
    专利说明:

    The invention relates to a measuring nozzle for determining the extensional viscosity of polymer melts during processing with a flow channel having a rectangular cross section, which has a transition section between an inlet section and an outlet section, each of constant cross section, which hyperbolicly tapers between two mutually opposite channel walls in the flow direction.
    A determination of extensional viscosity by means of pressure probes, upstream and downstream of a taper of a flow channel of a measurement nozzle, requires a constant average rate of expansion of the polymer melt in the tapered portion of the flow channel. For this purpose it is known (US Pat. No. 5,357,784 A, US Pat. No. 6,220,083 B1) to provide a measuring nozzle with an inlet section and an outlet section, each of constant cross section, and with a transition section tapering to the inlet cross section, the two forming one another to form the taper opposite channel walls with a hyperbolic course, but otherwise has a rectangular cross-section between the converging channel walls and these converging channel walls interconnecting, mutually parallel channel walls. Due to this geometry of the transition section between the inlet and the outlet portion of the measuring nozzle, a substantially constant average strain rate for the polymer melt can be ensured, but with the disadvantage of a relatively low pressure drop, which requires high sensitivity of the pressure sensor used with higher demands on the accuracy , Apart from the fact that such pressure sensors are connected to the inlet and outlet sections of the flow channel via measuring capillaries drilled into the measuring nozzle, which entails the risk of deposits in these measuring capillaries, commercially available pressure sensors can hardly meet the requirements for measuring accuracy.
    The invention is therefore based on the object, a measuring nozzle for determining the extensional viscosity of polymer melts in such a way that, despite the use of commercially available pressure sensor sufficient measurement accuracy can be ensured.
    Starting from a measuring nozzle of the type described, the invention achieves the stated object in that the transition section comprises an inlet-side zone, in which the mutual distance of the two channel walls between the two hyperbolic channel walls continuously decreases in the flow direction, and an adjoining outlet-side zone, in which two of the mutually opposing channel walls are parallel to each other, while the two disposed therebetween channel walls converge hyperbolic in the flow direction.
    By dividing the transition section into an inlet-side zone in which of the pairwise opposed channel walls, a pair in the flow direction hyperbolic converge steadily and maintaining the flow conditions for a constant average strain rate, the other pair, and an adjoining outlet-side zone, in the likewise a Pair of the pairwise opposed channel walls hyperbolic converges, while the other pair has a constant mutual distance, an extension of the flow section is made possible in which a constant average strain rate prevails. This leads to an increase in the pressure loss, on the basis of which the extensional viscosity is calculated, whereby the constructive conditions for the use of commercially available pressure sensors is created, which can meet higher demands on the measurement accuracy despite a moderate sensitivity in connection with the measuring nozzle according to the invention.
    The geometric conditions for a measuring nozzle according to the invention allow the immediate connection of commercially available pressure sensor at least to the inlet-side portion of the flow channel via a connecting thread. Limit the parallel channel walls of the outlet side zone of the transition section, the width of the flow channel, so that after the tapering of the channel width in the inlet side zone no change in the width of the flow channel longer results, so can also in the outlet side section of the measuring nozzle while avoiding Meßkapillaren commercial pressure sensor directly be connected to the flow channel.
    In the drawing, the subject invention is shown, for example. Show it
    1 shows a measuring nozzle according to the invention for determining the extensional viscosity of polymer melts in a schematic, partly torn plan view,
    Fig. 2 shows this measuring nozzle in a section along the line II-II of Fig. 1 and Fig. 3, the transition section between the inlet and the outlet portion of the measuring nozzle in a longitudinal section in a larger scale.
    The measuring nozzle illustrated forms a flow channel for a polymer melt which comprises an inlet section 1 which can be connected, for example, to an extruder and an outlet section 2 and a transition section 3 between the inlet and outlet sections 1, 2. The flow cross section is rectangular throughout the nozzle length. In the transitional section 3, the flow cross-section of the inlet section 1 is reduced to the cross-section of the outlet section 2 reduced both in width and in height relative to the inlet section 1, under flow conditions ensuring a constant average strain rate in the transition section 3. For this purpose, the transition section 3 is divided into an inlet-side zone 4 and an outlet-side zone 5 each having a different geometric shape. In the inlet-side zone 4 converge two channel walls 6, the pairwise opposite channel walls 6, 7 hyperbolic, while the mutual distance of the channel walls 7 of the other channel wall pair in the flow direction 8 steadily, preferably linearly decreases. In order to obtain a constant average strain rate in the inlet-side zone 4, the width y of a rectangular cross-section at the point x in the nozzle longitudinal direction of the condition
    where C, a and ki are flow condition dependent constants and z is half the height of the cross section at x. In the case of a linear decrease in the height, z = H / 2-k2 ×, if the inclination of the relevant channel wall 7 with respect to the nozzle axis is assumed as being of a central x-axis and a height H of the cross-section of the inlet-side section 1 and a gradient k2 , as indicated in Figs. 1 and 3.
    In the subsequent outflow-side zone 5, a pair of the channel walls 6, 7 is guided in parallel in order to maintain a constant average strain rate, while the other pair converges in the flow direction 8 according to a hyperbolic function. In the exemplary embodiment, the channel walls 7, which determine the height of the flow channel, converge, so that this channel taper in the region of the zone 5 does not result in a reduction of the channel width. This circumstance makes it possible to connect commercially available pressure sensors not only in the region of the inlet section 1 but also in the region of the outlet section 2 directly to the flow channel. In the exemplary embodiment, this is indicated by connecting holes 9.
    Due to the special geometric shape of the measuring nozzle, the length range of the transitional section 3 is increased in comparison with known measuring nozzles, in which a constant average strain rate can be maintained as a prerequisite for determining the extensional viscosity of polymer melts. The concomitant increase in pressure drop makes the measuring nozzle more sensitive, so that even with commercially available pressure sensors sufficiently accurate results can be obtained.
    权利要求:
    Claims (2)
    [1]
    1. measuring nozzle for determining the extensional viscosity of polymer melts during their processing with a rectangular cross-section having flow channel having between an inlet section (1) and a discharge section (2) each having a constant cross section cross section (3) extending between two opposite channel walls (6 or 7) in the flow direction (8) hyperbolic tapers, characterized in that the transition section (3) an inlet-side zone (4) in which the mutual distance of the two channel walls (7) between the two hyperbolic channel walls (6) continuously reduced in the flow direction (8), and an adjoining outflow-side zone (5), in which two of the mutually pairwise opposite channel walls (6, 7) parallel to each other, while the two interposed channel walls (7) in the flow direction (8) hyperbolic converge.
    [2]
    2. measuring nozzle according to claim 1, characterized in that the parallel channel walls (6) of the outlet-side zone (5) of the transition section (3) limit the width of the flow channel.
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    引用文献:
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    US6153136A|1997-10-17|2000-11-28|Board Of Supervisors Of Louisiana State University And Agricultural And Mechanical College|Process for manufacturing cellulosic microfibers|
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    DE19848687B4|1998-10-22|2007-10-18|Thermo Electron Gmbh|Method and device for the simultaneous determination of shear and extensional viscosity|
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    法律状态:
    2018-02-15| PC| Change of the owner|Owner name: LEISTRITZ EXTRUSIONSTECHNIK GMBH, DE Effective date: 20180109 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50465/2015A|AT517311B1|2015-06-08|2015-06-08|Measuring nozzle for determining the extensional viscosity of polymer melts|ATA50465/2015A| AT517311B1|2015-06-08|2015-06-08|Measuring nozzle for determining the extensional viscosity of polymer melts|
    PCT/AT2016/050180| WO2016197169A1|2015-06-08|2016-06-07|Measuring nozzle for determining the extensional viscosity of polymer melts|
    KR1020187000384A| KR102231204B1|2015-06-08|2016-06-07|Measuring nozzle for determining the elongation viscosity of a polymer melt|
    RU2017142768A| RU2674128C1|2015-06-08|2016-06-07|Measuring nozzle for measuring shear viscosity of polymer melts|
    US15/580,803| US10508980B2|2015-06-08|2016-06-07|Measuring nozzle for determining the extensional viscosity of polymer melts|
    ES16732919T| ES2764496T3|2015-06-08|2016-06-07|Measuring nozzle for determination of the viscosity of polymer melt extension|
    CN201680033606.2A| CN107995947B|2015-06-08|2016-06-07|Measuring nozzle for determining the elongational viscosity of a polymer melt|
    EP16732919.2A| EP3304035B1|2015-06-08|2016-06-07|Measuring nozzle for determining the extensional viscosity of polymer melts|
    DK16732919.2T| DK3304035T3|2015-06-08|2016-06-07|MEASURING DETECTION FOR DETERMINATION OF EXTENSION VISCOSITY IN POLYMER MELTS|
    JP2017564548A| JP6606197B2|2015-06-08|2016-06-07|Measuring nozzle for determining the elongational viscosity of polymer melts|
    PL16732919T| PL3304035T3|2015-06-08|2016-06-07|Measuring nozzle for determining the extensional viscosity of polymer melts|
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