JP4976728B2 - Device for splitting non-Newtonian liquid flowing through a passage - Google Patents

Description

  The present invention relates to a device for targeting and dividing a non-Newtonian liquid flowing through a passage.

  In the case of injection molding, a molten synthetic material (such as a thermoplastic material) has a high temperature at which, for example, there are branches at several points and the molten material supplied to one passage is divided into two discharge passages. Pass through the passage manifold system. These branches are mostly T-shaped.

  In the case of a Newtonian liquid flowing through a circular passage, the parabolic flow velocity distribution of the liquid subdivided into imaginary concentric hollow cylindrical layers is the fastest at the center of the passage. In such a liquid, the shear forces between several imaginary hollow cylinder layers of the liquid are approximately equal.

  On the other hand, non-Newtonian liquids, such as (hot) liquid plastics, behave differently. In such a case, the viscosity depends on the shear force maximizing near the wall of the circular passage. The lower the viscosity, the greater the shear force. As a result, the viscosity near the wall of the circular passage is minimal. The distribution of melt viscosity on the cross section resembles a sharply flattened parabola. In the case of a simple approximation, this means that in the central region of the passage, the relatively viscous flowable melt behaves like a plug, in which case the flow rate is roughly the radial position. It becomes irrelevant, while in the surrounding area, the greater shear forces mean that the melt is more fluid and flows more slowly.

  Figures 1a to 1c illustrate this behavior. FIG. 1a shows a circular passage through which a non-Newtonian liquid such as a plastic melt flows. FIG. 1b shows the distribution of the flow velocity “V” on the cross section, and FIG. 1c shows the distribution of shear force. Region “d” corresponds more or less to the plug.

  If a non-Newtonian liquid flow of the type shown in FIG. 1 bypasses the rectangular (T-shaped) branch T1 of the passage and is divided into two separate flows S1 and S2, as shown in FIG. The high viscosity part and the fluid part of the liquid are distributed over the cross section of the passage. Figures 3a to 3c show this distribution on the cross section. In these drawings, the region HV represents a high viscosity liquid, and the remaining region LV represents a low viscosity liquid. On the coordinate system shown in FIGS. 2-5, the coordinates x and y are located in the plane of the drawing, and the coordinate z is perpendicular to the plane of the drawing. Therefore, the high-viscosity HV portion of the non-Newtonian liquid is mostly concentrated in the lower portion (in the direction of the drawing) of the passage segments 2a and 2b of FIG. This can be understood immediately. This is because the viscous fluid (melt) supplied from the central region of the passage segment 1 proceeds in the direction of the bottom 6 of the T-tube and then as shown by the arrow “a” in FIG. This is because the more fluid liquid that deflects left and right at 2 while flowing in the peripheral region of the passage 1 is deflected at the beginning of the passage branch, as indicated by the arrow “b”.

  If the passage segments 2a and 2b in FIG. 2 are very long, the natural distribution shown in FIG. 3a is gradually re-established. In practice, however, the passage segments are short, so that the distribution shown in FIGS. 3b and 3c is maintained almost intact until the next deflection of the T-tube.

  When the liquid flowing in the passage segment 2a encounters the T-shaped tube T2 whose longitudinal axis runs in the y direction, the distribution shown in FIG. 4 is obtained in the discharge passages 3a and 3b. This figure shows the flow direction of the discharge passage in question. Within the discharge passage, the highly viscous and fluid portions are significantly non-uniform and the portions are significantly asymmetric with respect to the center of the passage.

  The T-shaped tube T3 in FIG. 2 has two discharge passages 4a and 4b that run perpendicular to the plane of the drawing (z direction). Please refer to FIG. 2a which shows a plan view of this part of FIG. After deflection in this T-tube T2, as shown in FIGS. 5a and 5b, the high viscosity part and the fluid part of the liquid are separated. In the discharge passage 4b extending upward from the plane of FIG. 2, the distribution of FIG. 5c is established, and in the passage 4b entering the plane of FIG. 2, the distribution of FIG. 5b is established. It is again formed by a T-tube in the direction of flow.

  In the case of injection molding, the injection nozzle connected to the injection molding tool (mold) has a non-uniform quantitative distribution of melt components of different viscosities (eg, FIGS. 4b and 4c), and / or If the melt distribution is no longer rotationally symmetric with respect to the longitudinal axis of the passage (eg, FIGS. 3b and 5b), this can cause defects in the cast injection molded product.

  Assuming that the plate is ejected by a plurality of nozzles arranged on the plate area, the following defects may occur.

  If the portion of the flowable melt from the nozzle in the outer area of the plate is more than that from the noise in the inner area of the plate, under the instantaneous pressure of the incoming melt, More melt is forced into the injection tool (injection mold) in the outer area of the plate. This means that when the plate is compared to the inner region, the unit area in the outer region will be supplied with more material and therefore the edge of the cast plate will be undulated. Conversely, if the flowable melt is forced into the injection mold in the internal region, after the melt cools, a larger amount of melt is supplied to the unit area inside the interior, The internal area of the plate will swell.

  If the melted portions in the passage segment fed to the nozzle are distributed asymmetrically, a similar situation occurs, although not too much trouble.

  For example, if each of several injection nozzles of a hot passage manifold system injects a cup, the uneven distribution of the viscous and flowable melt between the various nozzles will cause the cup wall The thickness of the part varies depending on the location. If the distribution of the melt components becomes asymmetric, the side of the cup, which preferably contains a flowable melt, is thicker than the opposite side of the cup and the middle part becomes a swollen cup and / or has a viscosity of If a high melt enters the mold, it will not reach the bottom of the mold.

  One object of the present invention is to provide a device that minimizes or eliminates as little as possible and / or prevents the occurrence of asymmetric and / or non-uniform distribution of liquid components of different viscosities due to said deflection. Is to develop.

  To achieve this objective, a first embodiment of a device for performing a targeted division of a non-Newtonian liquid, such as a molten synthetic material flowing through the passage (1), is used. The material becomes less viscous towards the outside in the cross section of the flow through a T-shaped passage branch (T) that deflects and divides the liquid flow. In the passage branch (T) is located a partition that divides the liquid flowing in the opposite direction from the supply passage segment (1) in half. Preferably, the angular position of the partition wall (11) is adapted to match the distribution of the different components of the liquid viscosity in the supply passage segment (1). If the present invention is used, the liquid is divided between the discharge passages (2a, 2b) of the passage branch (T) without causing significant separation of components having different liquid viscosities.

  Using this embodiment of the invention, melt components of different viscosities are distributed in a rotationally symmetrical manner, preferably or substantially in the feed channel segment of the T-shaped channel branch. Instead, the proportions of the melt components having different viscosities are approximately equal in the two discharge passage segments of the passage branch.

  In the case of the second embodiment of the present invention, a deflection device is provided to divide the material flow.

  In the case of this second form of the device, the distribution of the melt components with different viscosities is rotationally symmetric, preferably in the feed channel segment of the T-shaped channel branch. In the two discharge passage segments of the passage branch, the rotationally symmetric distribution remains essentially the same, and the proportions of the melt components having different viscosities in the two discharge passages are substantially equal. Therefore, the distribution pattern in the discharge passage segment is essentially the same as the distribution pattern in the supply segment.

  The discharge passage can have the same cross section as the supply passage, so that the flow velocity in the discharge passage is halved. As an alternative, however, the discharge passage can have a small cross-section, in which case the flow rate reduction is more gradual or does not reduce the flow rate at all.

  The invention will now be described with reference to exemplary embodiments and with reference to additional drawings.

  Figures 6a and 6b show in principle an exemplary embodiment having the structure of a first type of device according to the invention. In the passage branch, the melt partition 11 is installed so that the partition divides the melt flow from the supply passage segment 1. In this case, the partition wall 11 is installed at a rotation angle such that liquid components having different viscosities are not distributed rotationally symmetrically with respect to the longitudinal axis of the passage and separate the approaching melt. In this case, the two partial streams contain equal amounts of different liquid components of viscosity.

  In the case where the partition wall 11 is not present, and assuming that the melt is distributed between the discharge passages corresponding to the line “t” in FIG. 6a, the partition wall 11 positioned at the angular position in FIG. The approaching melt can be divided so that a high viscosity liquid and a low viscosity liquid are fed to the two discharge passages in the same proportion. The partition 11 can be placed in the passage branch in any suitable manner depending on the angular position adjusted or adjustable.

  7 and 8 show an actual embodiment of such an exemplary device according to the present invention. In the case of FIG. 7, starting from the bottom 6 of the T-shaped passage branch, a hole 12 is formed in the T-tube. In the hole 12, the partition plug 10 to which the partition 11 is firmly fixed is pushed to the center of the discharge passage segments 22a and 22b. In this case, the partition wall plug is rotated to a desired angular position as shown in FIG. In order to prevent the plug 10 from being pushed out by pressure during use, the plug is fixed in its axial position by means of a screw plug 14 which can be screwed into the hole 12 by means of a hexagon socket 15, for example. Preferably, the plug 10 is dome-shaped at its end close to the bulkhead 11 where the bulkhead 11 is secured in any way by its side facing away from the supply passage segment 1. A non-hollow body having a recess 16 is preferred. The required angular position of the partition wall 11 is determined by the rotational position at which the partition wall plug 10 is inserted into the hole 12. This angular position is maintained by any conventional method such as crimping or any other suitable suitable rotational lock.

  Conveniently, as already described, the bulkhead plug 10 starting from the discharge passages 22a and 22b after the plug has been installed in the passage branch, has a diameter of the discharge passage in the region of the dome-shaped recess 16. It is hollowed out to form a semicircular flow opening 17 (in the projection). Of course, alternatively, these flow openings can be formed prior to installation on the septum plug.

  In the case of FIG. 7, in order to make the drawing easy to understand, the partition wall 11 is located at an angular position perpendicular to the surface of the drawing, and the opening 17 formed by drilling is located within the surface of the drawing. . In practice, these flow openings 17 are rotated 90 degrees, while the angular position of the septum 11 is adapted to the distribution of liquid components with different viscosities in the supply passage 1, as shown in FIG. 6b. It will be understood that a certain angular position can be taken with respect to the plane of the figure.

  In the case of FIG. 7, the bottom 6 of the passage branch is provided with a reinforcement 18. This reinforcement is only needed if the wall of the hot passage manifold block where the commercial tee or flow passage is formed does not have sufficient thickness.

  FIGS. 8 a and 8 b are two perspective views of the above example of a non-hollow septum plug 10 that includes a septum 11. FIG. 8 a shows the plug 10 before hollowing out a dome-shaped recess 16 showing the rear hex socket 13. FIG. 8b shows the plug and the resulting flow opening 17 including holes that are formed for convenience after installation.

  In the case of the second embodiment of the device according to the invention, the liquid distribution due to the symmetrical distribution of the liquid components of different viscosities according to FIG. 3a in the passage branch is such that this distribution remains substantially intact in the discharge passage of the passage branch. Its purpose is to divide and deflect the flow.

  In FIG. 9b, assuming that the liquid in the supply passage segment 21 is distributed as in FIG. 3a, the distribution in the discharge passage segments 22a and 22b corresponds to FIG. 3b and FIG. 3c. However, if the same flow of liquid as pipe 21 supplies from the top to the passage branch in the drawing is desired, but also from the bottom, it was forced to be displaced in FIG. 9b into passages 22a and 22b. It can easily be seen that the viscous liquid component is shifted by the assumed additional liquid flow in the direction of the center of the passages 22a and 22b.

  This can be done with a second type of device according to the invention that includes a normal passage branch. In the case of the second type of device according to the invention, the two components are such that the viscous liquid component flowing through the center of the supply passage segment is divided and merges at approximately right angles to each other at the entrance of the discharge passage segment. Is deflected. The direction of flow at this encounter site is substantially perpendicular to the longitudinal direction of the discharge passage.

  To do so, the passage branch enters the supply passage segment 21 with the blades 24 and flows a highly viscous liquid component flowing in the center of the passage segment 21, one continuously flowing on the left side of the deflection device 23, On the other hand, the deflecting device 23 is positioned so as to essentially divide into two components that continuously flow on the right side of the deflecting device 23. Since these components are deflected, they merge in the drawing so that they are perpendicular to each other if possible at the bottom end 7 of the passage branch.

  On its side, the web 27 with which the two viscous components collide serves only to mechanically attach the deflection device 23 in the passage branch. In the case of the present invention, this web is not necessary. Preferably, the actual deflection device 23 does not touch the passage segment 21 anywhere around its entire circumference.

  10a and 10b show an actual embodiment of the deflection device 23. FIG. The web 27 is adjacent to a cylindrical segment 31 that can transition to a larger diameter cylindrical segment 32. By means of the segment 31, the deflection device is pushed through the hole in the bottom of the passage branch as long as the position of FIGS. 9a and 9b is fixed in a sealed state.

  In principle, for example, the strut 28 shown in dotted lines in FIG. 9a allows the deflection device 23 to be fixed in the channel branch in any way as desired, but in the case of small diameter channels. It ’s difficult.

  The deflection device 23 comprising the web 27 and the cylindrical segment 31 comprises a blade 24 at the front end and at the rear end by a notch on both sides facing each other and parallel to the blade 24. It can be made from a continuous cylinder with a constriction forming. Preferably, the opposing side 25 of the deflecting device is located on a round or round curved surface that extends from the blade 24 to the web 27 and transitions to the surface of the original cylinder 31.

  FIG. 11 shows a deflecting device of the type of FIG. 11 installed in a T-shaped passage branch. Reference numerals in FIG. 11 denote the same parts in these drawings as long as they correspond to the reference numerals in FIG. 9 and FIG.

  Other details, advantages, and features of the present invention will become apparent from the following description when read in conjunction with the accompanying drawings.

The flow situation of the non-Newtonian liquid in the cylindrical passage is shown. A passage manifold system with three T-shaped passage branches. FIG. 3 is a plan view of a part of FIG. 2. Fig. 4 shows a distribution of a first symmetrical distribution of viscous and flowing liquid components behind the first channel branch T1. The distribution of the continuous flow of the melt from the first passage branch T1 is shown to be affected by the passage branch T2 in the same plane as the previously passed passage branch T1. FIG. 4 shows a distribution corresponding to FIG. 4 at a subsequent passage branch T3 located in a plane perpendicular to the passage branch T1 passed through before. 1 is a first embodiment of the present invention by way of example having the structure of a device of the first form in principle. FIG. 7 is an actual example of a first type of embodiment of the device of FIG. 6 incorporated within a T-shaped passage branch. It is a perspective view of the actual example of embodiment of the partition plug used in FIG. FIG. 3 is a perspective view of a practical example of a second type of embodiment of the device according to the invention, incorporated in a T-shaped passage branch in two parts perpendicular to each other. 9b is an enlarged view of a practical example of the embodiment of the deflecting device of FIGS. 9a and 9b of two drawings perpendicular to each other including a fixed part. It is the deflection | deviation apparatus of FIG. 10 installed in the T-shaped tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply path segment 6 Bottom part 10 Partition plug 11 Partition 12 Hole part 13,15 Hex socket 14 Screw / plug 16 Dome-shaped recessed part 17 Opening part 18 Reinforcement material 21 Supply path segment 22a, 22b Discharge path segment 23 Deflector 24 Blade 27 Web 31, 32 Cylindrical segment

Claims (8)

  A device for dividing a non-Newtonian liquid material flowing through a passage, said material being reduced outwardly in a cross section of the flow through a substantially T-shaped passage branch that deflects and divides the liquid flow. A septum member having a viscosity, the device comprising a septum member positioned in a septum plug member adjacent an end of the supply passage in a passage branch that divides the liquid flowing in the opposite direction from the supply passage segment in half; The partition member is positioned in a dome-shaped recess in the partition plug member, and the angular position of the partition member is adapted to the distribution of components having different viscosity of the liquid in the supply passage segment and flows in the discharge passage However, the device does not have a substantial distribution of components having different viscosities of the liquid.   The device according to claim 1, wherein an angular position of the partition member can be adjusted.   The device according to claim 1, wherein the partition member is located in the passage branch by a partition plug member to which the partition member is attached by a hole in the passage branch.   The device according to claim 2, wherein the partition member is located in the passage branch by a partition plug member to which the partition member is attached by a hole in the passage branch.   4. The device of claim 3, wherein the septum plug member at a first end adjacent to the supply passage segment has a dome-shaped recess to which the septum member is secured.   The device of claim 5, wherein the dome-shaped recess is open in the direction of the discharge passage.   4. The device of claim 3, wherein a screw plug can be screwed into the hole at the back of the septum plug member to fix the vertical position of the septum plug member.   5. The device of claim 4, wherein a screw plug can be screwed into the hole at the back of the septum plug member to fix the vertical position of the septum plug member.

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