JP2007245503A - Plastication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastication device which has large shear force and operates kneading. <P>SOLUTION: In the plastication device having a fixed disk 2 having a hole in its central part and a rotary disk 1 facing the fixed disk 2, a raw material is charged from the peripheral parts of the fixed disk 2 and the rotary disk 1 into a space between the opposed surfaces of the disks 1 and 2 while the raw material is plasticated, and the plasticated molten raw material is discharged from the hole of the fixed disk 2. At least one of the rotary disk 1 and the fixed disk 2 has a spiral groove 4 extending from the peripheral part toward the central part in the opposed surface, and a resistance member 43 resisting the flow of the raw material is installed in the groove 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasticizing apparatus applied to an extruder or an injection molding machine, and more particularly to a resin plasticizing apparatus using a fixed disk and a rotating disk.

  As a conventional plasticizing apparatus, as shown in FIGS. 11 to 13, for example, a fixed disk provided with a spiral groove is known (see, for example, Patent Document 1).

  FIG. 11 is a schematic view showing the entire structure of a conventional plasticizing apparatus, and an electric motor 53, a speed reducer 54, and a fixed plate 55 are fixed on a base plate 52. A fixed disc 51 having a heating device 56 ′ attached to the back surface is fixed to the fixed plate 55, and a conduit 57 passes through the fixed plate 55 and protrudes to the outside at the center of the fixed disc 51. Yes. On the other hand, a rotating disk 50 is connected to the speed reducer 54 via a rotating shaft 58, and the rotating disk 50 is rotatably fitted to a fixed plate 55. The power is transmitted from the electric motor 53 to the rotating disk 50 via the speed reducer 54.

  In the fixed disk 51, as shown in FIG. 12, a spiral groove c is processed from the periphery of the disk toward the center. As shown in FIG. 13, the depth of the groove c is constant from the peripheral part to the center part, and the depth is large only at the center part. The opposing surface of one rotating disk 50 is a flat surface.

The material dropped from the material reservoir 59 now falls from the opening A (see FIG. 12) of the groove c formed in the fixed disk 51, and the groove c of the fixed disk 51 is caused by the friction between the rotating disk 50 and the material. It is heated by the heating devices 56, 56 ′ while being sent toward the center, and is plasticized by receiving a shearing force between the surface of the rotating disk 50 and the groove bottom of the fixed disk 51.
JP 61-262107 A

  By the way, in this type of conventional plasticizing apparatus, since the surface of the rotating disk 50 facing the fixed disk 51 is smooth and the bottom and side walls of the groove c are also smooth, the frictional force is small and the raw material is heated. The shearing force applied in the molten state is small. As a result, a uniform kneaded state cannot be created.

  This invention is made | formed in view of the problem of the said conventional plasticizing apparatus, and makes it a subject to provide the plasticizing apparatus with a large shear force and a kneading effect | action.

  The invention according to claim 1, which has been made to solve the problem, includes a fixed disk having a hole in the center and a rotating disk facing the fixed disk, and the fixed disk between the opposing surfaces. And a plasticizing device for feeding a plasticized molten raw material to the outside through the holes of the fixed disk while plasticizing the raw material in the middle of feeding the raw material from the peripheral edge of the rotating disk At least one of the disks has a spiral groove on the opposite surface from the peripheral part to the center part, and the spiral groove is provided with a resistance member that resists the flow of the raw material. Device.

  Since the spiral groove is provided with a resistance member that resists the flow of the raw material, the shearing force applied to the raw material in the molten state can be increased and the kneading action can be exerted.

  The invention according to claim 2 is the plasticizing device according to claim 1, wherein at least one of the rotating disk and the fixed disk is in a spiral shape from a peripheral part to a central part on an opposing surface. It is characterized by having a plurality of grooves.

  As in the present invention, when the resistance member is provided in the spiral groove, the flow rate of the raw material is suppressed by the resistance member, and as a result, the discharge amount may be reduced. By having a plurality, it is possible to provide a plasticizing apparatus that improves the shearing force and has the same discharge rate. Furthermore, by having a plurality of spiral grooves, the rate at which the speed of the resin in the central portion decreases with respect to the speed of the resin in the peripheral portion increases, and as a result, the resin is easily compressed in the central portion. Therefore, it is possible to effectively remove bubbles that have entered during the melting process.

  The invention according to claim 3 is the plasticizing apparatus according to claim 1, wherein the resistance member is provided at the central portion of the spiral groove.

  Since the raw material becomes a molten raw material in the vicinity of the center portion, the molten raw material gets over the resistance member, and the shearing force is further increased.

  The invention according to claim 4 is the plasticizing apparatus according to claim 1, wherein the resistance member includes a protrusion protruding from the bottom or side wall of the spiral groove into the space of the groove. Yes.

  Since the resistance member over which the raw material in the molten state overcomes is a protrusion, a greater shearing force acts and the kneading action also increases.

  The invention according to claim 5 is the plasticizing apparatus according to claim 1, wherein the resistance member includes a weir lower than a side wall of the spiral groove.

  Since the resistance member over which the raw material in the molten state overcomes is the weir, a large shearing force and kneading action act on the entire groove width.

  The invention according to claim 6 is the plasticizing device according to any one of claims 1 to 5, wherein the resistance member has a depth of the spiral groove from the peripheral portion to the central portion. It is characterized in that it is the bottom of the spiral groove formed in at least one of the rotating disk and the fixed disk so as to become smaller toward.

  Since the depth of the spiral groove decreases from the peripheral part toward the center part, the cross-sectional area of the groove decreases toward the center part, and a compression action acts on the raw material in the molten state. As a result, bubbles that have entered during the melting process can be removed. Furthermore, by using in combination with the protrusions and weirs as resistance members formed in the spiral groove, the shearing force is applied in a state where the compression action is exerted, which further contributes to the plasticization of the raw material. Further, if a plurality of spiral grooves are formed and this configuration is adopted, the compression effect of the raw material is remarkably increased.

  Since the spiral groove is provided with a resistance member that resists the flow of the raw material, the shearing force applied to the raw material in the molten state can be increased and the kneading action can be exerted.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 to 3 show the best mode for carrying out the present invention. FIG. 1 is a schematic view showing the overall structure of the plasticizing apparatus, FIG. 2 is a front view of a rotating disk, and FIG. 3 is a sectional view taken along the line DD of FIG.

  On the base plate 31, a motor 33, a reduction gear 34, and a fixed plate 32 are fixed. A fixed disk 2 having a heater 37 ′ attached to the back surface portion is fixed to the fixed disk 32, and a conduit 9 penetrates through the fixed disk 31 and is fixed to the center of the fixed disk 2. On the other hand, a rotating disk 1 having a heater 37 attached to the back surface thereof is connected to the speed reducer 34 via a rotating shaft 36, and the rotating disk 1 is rotatably fitted to the fixed platen 32. The power is transmitted from the motor 33 to the rotating disk 1 via the speed reducer 34. Reference numeral 35 denotes a bearing for the rotary shaft 36.

  A spiral groove 4 shown in FIGS. 2 and 3 is formed in the rotating disk 1. That is, the rotating disk 1 is formed with a spiral groove 4 from the peripheral edge of the disk (raw material inlet) to the center (melted raw material outlet), and in the bottom 42 of the groove 4 near the center. A wart-like protrusion 43 is provided as a resistance member.

  The lower end portion of the hopper 38 for supplying the raw material is in contact with the groove 4 of the rotating disk 1, and the raw material is supplied to the spiral groove 4 of the rotating disk 1.

  The raw material now falls from the hopper 38 and falls into the spiral groove 4 of the rotating disk 1, the friction between the fixed disk 2 and the raw material, the bottom 42 and the side wall 41 of the helical groove 4 of the rotating disk 2, and the raw material Due to the friction, it is heated by the heaters 37, 37 ′ while being sent toward the center of the groove 4, and becomes a molten raw material in the middle of the groove 4, for example, near the position where the wart-shaped protrusion 43 appears. The molten raw material is plasticized by receiving a shearing force between the surface of the fixed disk 2 and the groove bottom 42 of the rotating disk 1. A shearing force can be increased and a kneading action can be exerted. As a result, the molten raw material is made uniform.

  If the height of the protrusion is too low, the kneading action is weak, and if it is too high, the molten raw material becomes difficult to flow. Assuming that the height of the side wall 41 of the groove 4 is h and the height of the warped protrusion 43 is h ′, h ′ / h = 0.1 to 0.8 is experimentally desirable.

  In the present embodiment, the protrusion is provided only on the groove bottom 42, but it is preferable to provide the protrusion also on the groove side wall 41. Thereby, kneading action increases.

(Embodiment 2)
4 and 5 show the shape of the resistance member of the rotating disk 1 according to the second embodiment of the present invention. FIG. 4 is a front view of the rotating disk, and FIG. 5 is a cross-sectional view taken along line EE of FIG. FIG. The plasticizing apparatus of the present embodiment is the same as that of the first embodiment except for the rotating disk 1.

  The rotating disk 1 according to the present embodiment includes a weir 44 as a resistance member in the groove 4 near the center. The weirs 44 are lower in height than the groove sidewalls 41 and are arranged radially from the center in the radial direction.

  As shown in FIG. 6, the weir 44 ′ may be provided in contact with the groove side wall 41. By doing so, the length of the weir is increased, the shearing force applied to the molten raw material can be further increased, and the kneading action can be enhanced.

(Embodiment 3)
7 to 9 show the groove shape of the rotating disk 1 according to the third embodiment of the present invention. FIG. 7 is a front view of the rotating disk, and FIG. 8 is a sectional view taken along line FF in FIG. 9 is a G view of FIG.

  In the spiral groove 4 of the present embodiment, the depth of the groove decreases from the peripheral edge (raw material inlet) toward the center (melted raw material outlet). That is, as shown in FIG. 9, the groove bottom 42 is lifted from the peripheral part toward the center part like a spiral staircase. Therefore, as shown in FIG. 8, when the depth of the groove is d1, d2, d3,... From the peripheral part to the center part, d1 ≧ d2 ≧ d3 ≧ d4 ≧ d5 ≧ d6 ≧ d7. There is a relationship.

  As described above, the rotating disk 1 of the present embodiment has the spiral groove 4 in which the depth of the groove decreases from the peripheral edge (raw material inlet) toward the center (melted raw material outlet). The cross-sectional area of the material becomes smaller toward the center, and the compression action acts on the molten raw material. As a result, bubbles that have entered during the melting process can be removed.

  In the present embodiment, the depth of the groove is continuously reduced.For example, the groove depth in the section connecting the vicinity of the inlet and the vicinity of the outlet is constant, for example, the vicinity of the inlet and the vicinity of the outlet. You may make it become continuously small.

(Embodiment 4)
FIG. 10 is a front view of the rotating disk 1 according to the fourth embodiment of the present invention. In FIG. 10, 4a, 4b, and 4c are spiral grooves, and the rotating disk 1 of this embodiment has three spiral grooves.

  Since there are a plurality of spiral grooves, there are a plurality of plasticizing routes, and the discharge amount is increased. Further, since the peripheral speed decreases at a short distance, a compression action works, and bubbles that have entered during the melting process can be removed. Such a configuration can be added to the configurations of the first to third embodiments.

  In the above-described embodiment, the spiral disk having the resistance member is provided on the rotating disk, but it is obvious that it can be provided on the fixed disk.

  Furthermore, the configurations of the first to fourth embodiments can be combined. Specifically, the configurations of Embodiments 2, 3, and 4 are added to the configuration of Embodiment 1, the configurations of Embodiments 3 and 4 are added to the configuration of Embodiment 2, and Embodiments 1 and The configurations of Embodiments 3 and 4 can be added to the configuration of Mode 2.

  The present invention is very likely to be widely used for manufacturing plastic parts in the automobile industry, the electric / electronic industry, and the like.

It is the schematic which shows the whole structure of the plasticizing apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a front view of a rotating disk in the first embodiment. It is the DD sectional view taken on the line of FIG. FIG. 6 is a front view of a rotating disk in the second embodiment. It is the EE sectional view taken on the line of FIG. It is a front view of the rotary disk of another form in Embodiment 2. FIG. FIG. 6 is a front view of a rotating disk in a third embodiment. It is the FF sectional view taken on the line of FIG. It is a G view of FIG. FIG. 6 is a front view of a rotating disk in a fourth embodiment. It is a general view which shows an example of the conventional plasticizing apparatus. It is a front view which shows an example of the conventional fixed disk. It is the BB sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotating disc 2 ... Fixed disc 4 ... Spiral groove 41 ... Groove side wall 42 ... ··· Groove bottom 43 ··· · Warts (resistance member)
44, 44 '... Weir (resistance member)

Claims (6)

A fixed disk having a hole in the center and a rotating disk facing the fixed disk, and the raw material is fed between the opposing surfaces from the peripheral edge of the fixed disk and the rotating disk In the plasticizing apparatus for sending the plasticized molten raw material to the outside from the hole of the fixed disk while plasticizing
At least one of the rotating disk and the fixed disk has a spiral groove on the opposite surface from the peripheral part to the center part, and a resistance member that resists the flow of the raw material is provided in the spiral groove. A plasticizing apparatus characterized by comprising:   2. The plasticizing apparatus according to claim 1, wherein at least one of the rotating disk and the fixed disk has a plurality of spiral grooves extending from a peripheral part to a central part on an opposing surface.   The plasticizing apparatus according to claim 1, wherein the resistance member is provided in the central portion of the spiral groove.   2. The plasticizing apparatus according to claim 1, wherein the resistance member includes a protrusion protruding into a space of the groove from a bottom or side wall of the spiral groove.   The plasticizing device according to claim 1, wherein the resistance member includes a weir lower than a side wall of the spiral groove.   The resistance member is formed of at least one of the rotating disk and the fixed disk so that the depth of the helical groove decreases from the peripheral part toward the central part. 6. The plasticizing apparatus according to claim 1, wherein the plasticizing apparatus is a bottom portion.

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