JP2013006171A - Kneading machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading machine that can suppress the generation of pores in a kneaded product.SOLUTION: In the kneading machine 1, a kneading shaft 3 includes: paddle parts 11; and pipe parts 12 positioned closer to the side of a discharge port 5 than the paddle parts 11 between an introduction port 4 and the discharge port 5 in the axial direction of the kneading shaft 3. When a kneading object A is introduced into barrels 2 from the introduction port 4, the kneading object A is kneaded by the paddle parts 11 and then the kneaded product B is discharged from the discharge port 5 through the pipe parts 12.

Description

  The present invention relates to a kneader, and more particularly to a kneader used for kneading powder and the like.

  Conventionally, kneaders have been widely used for kneading powders and the like.

  As such a kneading machine, for example, a cylindrical casing provided with an input port for inputting an object to be processed and an output port for discharging, and a cylindrical casing disposed in the cylindrical casing, from the input port side to the discharge port side. On the other hand, there has been proposed a continuous biaxial kneader including a kneading shaft provided with a feed screw, a paddle, and a reverse screw sequentially (see, for example, Patent Document 1).

  In such a continuous biaxial kneader, the workpiece (for example, powder) is introduced into the cylindrical casing from the charging port, and after the workpiece is kneaded by the paddle provided on the kneading shaft, The kneaded material to be processed is extruded from the discharge port to the outside of the cylindrical casing by a reverse screw and discharged.

Japanese Patent Laid-Open No. 11-267483

  However, pores (voids) may be generated in the kneaded material that has been kneaded and discharged by the continuous biaxial kneader described in Patent Document 1. Such pores in the kneaded product may cause problems in various industrial products in which the kneaded product is used.

  Then, this invention is providing the kneading machine which can suppress generation | occurrence | production of the pore in a kneaded material.

  In order to achieve the above object, the kneader of the present invention is a kneader comprising a barrel and a kneading shaft inserted into the barrel, and the barrel is provided with the kneading object on one end side. An introduction portion for introducing the inside of the barrel, and a discharge portion for discharging the kneaded material kneaded with the kneaded object to the outside of the barrel are formed on the other end side. Between the introduction part and the discharge part in the axial direction of the kneading shaft, a kneading part for kneading the material to be kneaded, disposed on the discharge part side of the kneading part, and along the axial direction of the kneading shaft And a low shear portion having a smooth surface extending so as not to be uneven.

  According to such a configuration, when the object to be kneaded is introduced from the introduction part into the barrel, the object to be kneaded is first kneaded by the kneading part, and then the kneaded object is smooth so as to extend without unevenness. It passes through a low shear portion having a surface, that is, a low shear portion in which shearing in a direction crossing the axial direction of the kneading shaft is suppressed, and is discharged from the discharge portion.

  Therefore, if the kneading object is kneaded using the kneader of the present invention, the generation of pores in the kneaded material in which the kneading object is kneaded can be suppressed.

  In the kneader of the present invention, it is preferable that the low shear portion is formed so as not to be uneven over the entire circumferential surface.

  According to such a configuration, the shear in the direction intersecting the axial direction of the kneading shaft in the low shear portion is further suppressed. As a result, the generation of pores in the kneaded product can be further suppressed.

  In the kneading machine of the present invention, the barrel includes a vent portion for discharging the gas in the barrel, and the vent portion is more in the axial direction of the kneading shaft than the low shear portion. It is preferable to arrange on the side.

  According to such a configuration, after the air, moisture, etc. in the kneaded product are discharged to the outside of the barrel, the kneaded product reaches the low shear portion. As a result, the generation of pores in the kneaded product can be further suppressed.

  In the kneading machine of the present invention, it is preferable that the discharge portion is disposed so as to overlap the low shear portion when projected in a direction orthogonal to the axial direction of the kneading shaft.

  According to such a configuration, the kneaded material is discharged to the outside of the barrel without being sheared again in a direction crossing the axial direction of the kneading shaft. As a result, the generation of pores in the kneaded product can be further suppressed.

  The kneading shaft in the kneading machine of the present invention is disposed between the introduction portion and the discharge portion in the axial direction of the kneading shaft, the kneading portion for kneading the material to be kneaded, and the discharge portion side of the kneading portion. And a low-shear portion having a smooth surface extending so as not to be uneven along the axial direction.

  Therefore, the kneader of the present invention can suppress the generation of pores in the kneaded product.

It is a schematic block diagram which shows the kneading machine which concerns on 1st Embodiment of this invention. It is a plane sectional view by the side of the discharge outlet of the kneader shown in FIG. It is a schematic block diagram which shows the kneader which concerns on 2nd Embodiment of this invention. It is a plane sectional view by the side of the discharge outlet of the kneader shown in FIG. It is a plane sectional view by the side of a discharge mouth of a kneader in a 3rd embodiment of the present invention. It is sectional drawing of the pipe part in 4th Embodiment of this invention. It is sectional drawing of the pipe part in 5th Embodiment of this invention. 3 is a digital microscope photograph of a cross section of the kneaded material of Example 2. FIG. 4 is a digital microscope photograph of a cross section of the kneaded material of Comparative Example 2.

1. First Embodiment As shown in FIGS. 1 and 2, a kneader 1 is a continuous biaxial kneader, and includes a barrel 2 and two kneading shafts 3.

  The barrel 2 is formed in a substantially oval cylindrical shape, and an introduction port 4 as an example of an introduction portion for introducing the kneading object A into the barrel 2 is provided on one end side thereof as shown in FIG. It has been. On the other end side, a discharge port 5 is provided as an example of a discharge unit for discharging the kneaded material B kneaded with the kneaded object A to the outside of the barrel 2.

  The inlet 4 is formed on one end side of the barrel 2 so as to penetrate the side wall of the barrel 2 on the outer side in the radial direction of the kneading shaft 3 (described later).

  Further, the discharge port 5 is formed on the other end side of the barrel 2 so as to penetrate the side wall of the barrel 2 on the other outer side in the radial direction of the kneading shaft 3 (described later).

  Examples of the cross-sectional shape of the discharge port 5 include a rectangular shape, an elliptical shape, and a circular shape, and an elliptical shape and a circular shape are preferable.

  Moreover, the cross-sectional area of the discharge port 5 is 7 to 50%, preferably 7 to 20% with respect to the cross-sectional area of the barrel 2, for example.

  Further, a melt-kneading section 6 for melting and kneading the kneaded object A is formed between the introduction port 4 and the discharge port 5 in the barrel 2.

  The melt-kneading part 6 includes a plurality (two) vent parts 7 for discharging the gas in the melt-kneading part 6 in the middle in the axial direction.

  Each vent portion 7 is formed on the outer side in the radial direction of the kneading shaft 3 (described later) so as to penetrate the side wall of the barrel 2. That is, each vent part 7 and the inlet 4 are formed so as to be parallel to each other in the radial direction of the kneading shaft 3 (described later).

  Moreover, each vent part 7 is always closed and can be appropriately opened as necessary.

  More specifically, the plurality of vent portions 7 include the vent portion 7 on the inlet side provided near the other end side of the inlet port 4 in the direction from the one end side to the other end side of the barrel 2, and the discharge port 5. And a vent portion 7 on the discharge port side provided in the vicinity of one end side.

  The vent 7 on the discharge port 5 side is connected to a pump (not shown), and the gas in the melt-kneading part 6 is sucked by the suction force generated by driving the pump (not shown).

  Further, the melt kneading unit 6 is provided with a heater (not shown), and the temperature of the melt kneading unit 6 is appropriately adjusted in units of blocks in the direction from one end side of the barrel 2 to the other end side.

  The kneading shaft 3 is a rotating shaft that is disposed inside the barrel 2 and mixes and shears the kneading object A, and includes a drive shaft 8, a feed screw portion 9, a reverse screw portion 10, and an example of a kneading portion. The paddle part 11 and the pipe part 12 as an example of a low shear part are integrally formed.

  Specifically, the kneading shaft 3 includes one drive shaft 8, a plurality (four) of feed screw portions 9, a plurality of (three) reverse screw portions 10, a plurality of (three) paddle portions 11, One pipe portion 12 is provided.

  In addition, the feed screw part 9, the reverse screw part 10, the paddle part 11, and the pipe part 12 can change the axial direction length and the number of installation suitably as needed.

  The plural (four) feed screw portions 9 are portions for conveying the kneaded object A toward the discharge port 5, specifically, the first feed portion 23, the second feed portion 24, and the third feed. These are formed from a portion 25 and a fourth feed portion 26, which are arranged at an interval in the axial direction of the drive shaft 8.

  The first feed part 23 is arranged at one end of the kneading shaft 3 so that when the introduction port 4 and the vent part 7 on the introduction port 4 side are projected in the radial direction of the drive shaft 8, they overlap with their projection surfaces. Has been placed. Further, the first feed portion 23 is formed so that the axial length of the drive shaft 8 is the longest compared to other feed portions.

  The fourth feed portion 26 is arranged on the most outlet side of the four feed portions, and overlaps the projection surface when the vent portion 7 on the outlet port 5 side is projected in the radial direction of the drive shaft 8. Is arranged. The fourth feed portion 26 is formed so that the axial length of the drive shaft 8 is approximately ½ of that of the first feed portion 23.

  The second feed part 24 and the third feed part 25 are arranged between the first feed part 23 and the fourth feed part 26, and the axial length of the drive shaft 8 is substantially the same as that of the first feed part 23. It is formed in 1/10.

  Moreover, the feed screw part 9 is provided with a helical screw strip 20 protruding from the outer peripheral surface of the drive shaft 8 as shown in FIG.

  Specifically, the screw strip 20 of the feed screw portion 9 is formed in a spiral shape in the same direction as the rotation direction (described later) of the drive shaft 8. That is, the feed screw portion 9 includes a right spiral screw strip 20.

  The pitch interval of the screw strip 20 in the feed screw portion 9 is, for example, 0.6 to 2.0 cm, preferably 1.5 to 2.0 cm.

  As shown in FIG. 1, a plurality of (three) reverse screw portions 10 are formed of a first reverse portion 30, a second reverse portion 31, and a third reverse portion 32, which are arranged in the axial direction of the kneading shaft 3. They are spaced apart from each other.

  The 3rd reverse part 32 is arrange | positioned at the other end part of the kneading shaft 3, and the axial direction length of the drive shaft 8 is formed longest compared with another reverse part. The axial length of the drive shaft 8 is approximately ¼ of the first feed portion 23.

  The first reverse unit 30 is disposed between the first feed unit 23 and the second feed unit 24 and adjacent to the second feed unit 24.

  The second reverse unit 31 is disposed between the second feed unit 24 and the third feed unit 25 and adjacent to the third feed unit 25.

  Further, the first reverse portion 30 and the second reverse portion 31 are formed so that the axial length of the drive shaft 8 is substantially 1/5 of the third reverse portion 32.

  Similarly to the feed screw portion 9, the reverse screw portion 10 also includes a helical screw strip 20 protruding from the outer peripheral surface of the drive shaft 8 as shown in FIG. 2.

  On the other hand, the screw strip 20 of the reverse screw portion 10 is formed in a spiral shape in the opposite direction to the screw strip 20 of the feed screw portion 9. In other words, the reverse screw portion 10 includes a left spiral screw strip 20.

  The pitch interval of the screw strip 20 in the reverse screw part 10 is, for example, 0.6 to 1.5 cm, or preferably 1.0 to 1.5 cm.

  The plurality (three) of paddle parts 11 are parts for kneading the material A to be kneaded. Specifically, the paddle parts 11 are formed of a first paddle part 27, a second paddle part 28, and a third paddle part 29. Are arranged at intervals in the axial direction of the kneading shaft 3.

  The first paddle part 27 is disposed between the first feed part 23 and the first reverse part 30.

  The second paddle part 28 is disposed between the second feed part 24 and the second reverse part 31.

  The third paddle part 29 is disposed between the third feed part 25 and the fourth feed part 26.

  Further, the first paddle part 27, the second paddle part 28, and the third paddle part 29 have substantially the same length in the axial direction of the drive shaft 8, and are substantially １ ／ of the first feed part 23. Is formed.

  Further, as shown in FIG. 2, the paddle part 11 includes a plurality of substantially elliptical paddle blades 21 arranged in parallel along the axial direction of the drive shaft 8.

  More specifically, the plurality of paddle blades 21 are arranged in parallel so that the long diameters of adjacent paddle blades 21 are displaced by about 90 ° in the axial direction of the drive shaft 8.

  The pipe portion 12 is formed in a substantially cylindrical shape along the axial direction of the drive shaft 8 and is formed so as not to have unevenness on the entire circumferential surface.

  The pipe portion 12 is disposed between the fourth feed portion 26 and the third reverse portion 32, and is disposed so as to overlap the projection surface when the discharge port 5 is projected in the radial direction of the drive shaft 8. ing. Further, the pipe portion 12 is formed such that the axial length of the drive shaft 8 is approximately ½ of the first feed portion 23.

  That is, in the kneading shaft 3, as shown in FIG. 1, the first feed portion 23, the first paddle portion 27, the first reverse portion 30, the second feed portion 8 are sequentially arranged from one end side to the other end side of the drive shaft 8. The feed part 24, the second paddle part 28, the second reverse part 31, the third feed part 25, the third paddle part 29, the fourth feed part 26, the pipe part 12, and the third reverse part 32 are arranged. .

  That is, the kneading shaft 3 has a unit composed of a feed part, a paddle part, and a reverse part repeatedly arranged from one end side to the other end side of the drive shaft 8. A feed part and a pipe part are further arranged between the reverse part.

  As shown in FIG. 2, the two kneading shafts 3 are arranged along the axial direction inside the barrel 2 and are arranged in parallel with each other along the radial direction.

  In addition, the two kneading shafts 3 are arranged so as not to interfere with each other's rotational drive in their respective parts (feed screw part 9, reverse screw part 10, paddle part 11).

  Further, both end portions of the drive shaft 8 of the kneading shaft 3 protrude outward in the axial direction of the barrel 2. Of the projecting ends, one end side is connected to a drive source (not shown) in a relatively non-rotatable manner, and the other end side is supported by a support wall (not shown) in a relatively rotatable manner. That is, the kneading shaft 3 is rotationally driven around the axis of the drive shaft 8 by transmitting a drive force from a drive source (not shown) to the drive shaft 8. Specifically, the kneading shaft 3 rotates clockwise in the axial direction of the drive shaft 8 when viewed from the inlet 4 side to the outlet 5 side.

  Further, as shown in FIG. 2, the inner peripheral surface of the barrel 2 and the feed screw portion 9, the reverse screw portion 10, and the paddle portion 11 of the kneading shaft 3 are spaced apart slightly in the radial direction of the kneading shaft 3. Are arranged to face each other. Further, the inner peripheral surface of the barrel 2 and the pipe portion 12 are arranged at a large interval in the radial direction of the kneading shaft 3 as compared with other portions.

  Next, the kneading of the kneading object A by the kneader 1 will be described.

  Examples of the kneading target A include a resin and a mixture of these with an additive.

  Examples of the resin include thermosetting resins such as epoxy resins, phenol resins, amino resins, diallyl phthalate resins, and alkyd resins, and thermoplastic resins such as polyamide resins, polycarbonate resins, polyethylene resins, and polypropylene resins. .

  Examples of the additive include a curing agent such as an amine compound, an acid anhydride compound, a phenol resin, a curing accelerator such as an imidazole compound, a filler such as silica, alumina, and a metal hydroxide, For example, a flexibility imparting agent such as an acrylic copolymer, a polystyrene-polyisobutylene copolymer, and a styrene acrylate copolymer, for example, a colorant such as carbon black can be used.

  In order to prepare the kneaded product B by kneading the kneaded object A with the kneader 1, first, the kneaded object A is introduced into the barrel 2 from the inlet 4 of the kneader 1.

  When a driving force from a driving source (not shown) is transmitted to the driving shaft 8, the kneading shaft 3 is driven to rotate, and the kneading object A is stirred by the first feed unit 23 while the first paddle unit It is conveyed toward 27.

  At this time, the barrel 2 (melt kneading part 6) located outside the first feed part 23 is adjusted to, for example, 15 to 20 ° C. by a heater (not shown). In addition, air or the like that has entered the inside of the barrel 2 along with the introduction of the kneading object A is released to the outside of the barrel 2 by opening the vent portion 7 on the inlet 4 side.

  Next, the conveyed kneading object A is kneaded in the first paddle part 27.

  At this time, the melt-kneading part 6 located outside the first paddle part 27 is adjusted to, for example, 40 to 80 ° C. by a heater (not shown).

  Then, the kneaded object A to be kneaded is pushed out toward the first reverse unit 30 by the pushing force of the kneading object A conveyed by the rotational drive of the first feed part 23.

  Most of the kneaded object A pushed out toward the first reverse unit 30 passes through the first reverse unit 30 and reaches the second feed unit 24. On the other hand, part of the extruded kneading object A is returned to the first paddle part 27 by the rotational drive of the first reverse part 30 and kneaded again.

  Thus, the kneading of the kneading object A is promoted and the conveyance speed of the kneading object A is adjusted.

  Next, the kneaded object A that has passed through the first reverse unit 30 is conveyed by the second feed unit 24 toward the second paddle unit 28 and the second reverse unit 31.

  Thus, the kneading object A passes through the second paddle portion 28 and the second reverse portion 31 while being kneaded, similarly to the first paddle portion 27 and the first reverse portion 30.

  At this time, the melt-kneading part 6 located outside the second paddle part 28 is adjusted to, for example, 60 to 120 ° C. by a heater (not shown).

  Next, the kneading object A that has passed through the second reverse unit 31 is conveyed to the third paddle unit 29 by the subsequent third feed unit 25 and further kneaded in the third paddle unit 29. Thereby, the kneading object A is prepared as the kneaded material B.

  At this time, the melt-kneading part 6 located outside the third paddle part 29 is adjusted to, for example, 80 to 140 ° C. by a heater (not shown).

  Then, the kneaded material B is pushed out by the rotational drive of the kneading shaft 3 and reaches the fourth feed portion 26.

  At this time, by driving a pump (not shown) connected to the vent portion 7 on the discharge port 5 side, moisture, volatile components, and the like in the kneaded product B are discharged to the outside of the melt-kneading portion 6.

  Thereby, the pores in the kneaded material B can be reduced.

  Next, the kneaded material B is conveyed to the pipe portion 12 by the fourth feed portion 26.

  As described above, the pipe portion 12 is formed so as not to be uneven on the entire circumferential surface. Therefore, in the pipe portion 12, the kneaded material B is smoothly moved along the axial direction of the pipe portion 12 while shearing in the direction intersecting the axial direction of the kneading shaft 3 is suppressed.

  And most of the kneaded material B is discharged from the discharge port 5.

  On the other hand, the kneaded material B that passes through the discharge port 5 without being discharged and reaches the third reverse portion 32 is also pushed back by the third reverse portion 32, and the kneaded material B is discharged from the discharge port 5.

  As described above, the kneaded product B in which the generation of pores is suppressed is prepared from the kneaded object A.

  In the kneading machine 1, the kneading shaft 3 is disposed between the introduction port 4 and the discharge port 5 in the axial direction between the paddle part 11 and the discharge port 5 side with respect to the paddle part 11, and has unevenness over the entire circumferential surface. And a pipe portion 12 formed so as not to exist.

  Therefore, after the kneaded object A is kneaded by the paddle part 11, the kneaded kneaded substance B passes through the pipe part 12 in which shearing in the direction intersecting the axial direction of the kneading shaft 3 is suppressed and discharged. It is discharged from the outlet 5.

  As a result, generation of pores in the kneaded material B can be suppressed.

  The melt kneading section 6 includes a vent section 7 on the introduction port 4 side and a vent section 7 on the discharge port 5 side. Each of these vent portions 7 is disposed closer to the introduction port 4 than the pipe portion 12 in the axial direction of the kneading shaft 3.

  Therefore, after the air, moisture, and the like of the kneaded object A and the kneaded material B are discharged to the outside of the melt-kneading unit 6, the kneaded material B reaches the pipe portion 12.

  As a result, generation of pores in the kneaded material B can be further suppressed.

  Further, the discharge port 5 is disposed so as to overlap the pipe portion 12 when projected in a direction (radial direction) orthogonal to the axial direction of the kneading shaft 3.

  Therefore, the kneaded material B is discharged to the outside of the barrel 2 again without being sheared in a direction crossing the axial direction of the kneading shaft 3.

As a result, generation of pores in the kneaded material B can be further suppressed.
2. Second Embodiment Next, a second embodiment of the present invention will be described.

  FIG. 3 is a schematic configuration diagram showing a kneading machine according to a second embodiment of the present invention, and FIG. 4 is a plan sectional view on the discharge port side of the kneading machine shown in FIG.

  3 and 4, portions corresponding to the respective portions shown in FIGS. 1 and 2 are denoted by the same reference numerals as those portions, and the description thereof is omitted.

  In the first embodiment, as shown in FIG. 1, the discharge port 5 is formed on the other end side of the barrel 2 on the other outer side in the radial direction of the kneading shaft 3 so as to penetrate the side wall of the barrel 2.

  On the other hand, in the second embodiment, as shown in FIGS. 3 and 4, the other end of the barrel 2 is formed as a discharge port 5.

  Therefore, it is not necessary to provide the third reverse portion 32 for pushing back the kneaded material B that has passed through the discharge port 5 without being discharged to the discharge port 5, and the free end portion of the pipe portion 12 has the discharge port 5 ( The other end of the barrel 2 is extended so as to protrude.

  As a result, the number of parts can be reduced, and the kneaded product B is not pushed back by the third reverse portion 32, so that gas can be prevented from being mixed into the kneaded product B. Therefore, the generation of pores in the kneaded material B can be suppressed while the manufacturing cost can be reduced.

  In the second embodiment, since the other end portion of the barrel 2 is formed as the discharge port 5, the other end portion of the drive shaft 8 is not supported, and only one end portion of the drive shaft 8 is a drive source. It is supported by being connected to a non-rotatable (not shown). Also by this, the kneading shaft 3 is supported so as to be rotatable relative to the barrel 2.

  In addition, examples of the cross-sectional shape of the discharge port 5 include a rectangular shape, an elliptical shape, and a circular shape, and an elliptical shape and a circular shape are preferable.

The cross-sectional area of the discharge port 5 is, for example, 15 to 50%, preferably 25 to 45% with respect to the cross-sectional area of the barrel 2.
3. 3rd Embodiment, 4th Embodiment, and 5th Embodiment FIG. 5: is a plane sectional view by the side of the discharge outlet of the kneading machine in 3rd Embodiment of this invention.

  In FIG. 5, portions corresponding to the respective portions shown in FIGS. 1 to 4 are denoted by the same reference numerals as those of the respective portions, and the description thereof is omitted.

  In the first embodiment (see FIG. 2) and the second embodiment (see FIG. 4), the pipe portion 12 is formed in a substantially cylindrical shape.

  On the other hand, in 3rd Embodiment shown in FIG. 5, the pipe part 12 is formed in the taper shape which becomes narrow toward the discharge outlet 5 side from the inlet 4 side. In addition, the pipe part 12 can also be formed so that it may become wide toward the discharge port 5 side from the inlet 4 side.

  FIG. 5 shows an aspect in which the pipe portion 12 in the first embodiment is formed in a tapered shape. However, the embodiment is not limited thereto, and the pipe portion 12 in the second embodiment (see FIG. 4) is tapered. It can also be formed.

  Also by this, generation | occurrence | production of the pore in the kneaded material B can be suppressed similarly to above-described 1st Embodiment and 2nd Embodiment.

  In said 1st Embodiment-3rd Embodiment, although the pipe part 12 is formed so that there may be no unevenness over the perimeter surface, it extends so that there may be no unevenness along the axial direction of the kneading shaft 3. What is necessary is just to have a smooth surface, for example, it can also form in a spline shape.

  As the pipe part 12 formed in a spline shape, an aspect (FIG. 6) having radially extending projections 34 radially outward of the pipe part 12, or a radial direction from the circumferential surface of the pipe part 12. The aspect (FIG. 7) which has the notch part 35 notched inside is mentioned.

  That is, FIG. 6 is a sectional view of a pipe portion in the fourth embodiment of the present invention.

  In the fourth embodiment shown in FIG. 6, the pipe portion 12 includes a plurality of (eight) protrusions 34 that extend radially outward in the radial direction of the pipe portion 12.

  The plurality (eight) protrusions 34 extend along the axial direction of the kneading shaft 3 and are arranged on the outer peripheral surface of the pipe portion 12 at equal intervals in the circumferential direction.

  Moreover, FIG. 7 is sectional drawing of the pipe part in 5th Embodiment of this invention.

  In the fifth embodiment shown in FIG. 7, the pipe portion 12 includes a plurality of (eight) notch portions 35 that are notched radially inward of the pipe portion 12.

  The plurality (eight) cutout portions 35 extend along the axial direction of the kneading shaft 3 and are arranged on the outer peripheral surface of the pipe portion 12 at equal intervals in the circumferential direction.

  Also by these, generation | occurrence | production of the pore in the kneaded material B can be suppressed similarly to above-described 1st Embodiment-3rd Embodiment.

  In addition, these embodiment (1st Embodiment-5th Embodiment) can be combined suitably.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these.

Examples 1 and 2
In the formulation (unit: parts by mass) shown in Table 1, each component (kneading object A) was introduced from the introduction port 4 of the kneading machine 1 (first embodiment) shown in FIG. ) The kneaded material prepared according to Formulation Example 1 was designated as Example 1, and the kneaded material prepared according to Formulation Example 2 was designated as Example 2.

Example 3
Each component (kneading object A) in Formulation Example 2 (unit: part by mass) shown in Table 1 was introduced from the inlet 4 of the kneading machine 1 (second embodiment) shown in FIG. Composition) was obtained.

Comparative Examples 1 and 2
A kneader in which the pipe portion 12 of the kneader 1 shown in FIG.

  Each component (kneading object A) was introduced from the introduction port 4 of the kneader in the formulation shown in Table 1 to obtain a kneaded product (resin composition). The kneaded material prepared according to Formulation Example 1 was designated as Comparative Example 1, and the kneaded material prepared according to Formulation Example 2 was designated as Comparative Example 2.

(Evaluation)
About the kneaded material obtained in each Example and each comparative example, the number of pores in the kneaded material was measured as follows. The results are shown in Table 2.
(1) Porosity measurement The kneaded material obtained in each Example and each Comparative Example was adjusted to a substantially cylindrical shape having an axial length of 15 mm to 30 mm and a diameter of 10 mm to 13 mm.

  Then, each kneaded product whose size was adjusted was put into a drier set at 175 ° C. for 1 hour to be cured. Then, each kneaded material was taken out from the dryer, put in a predetermined container, and cooled.

  On the other hand, an embedding resin for embedding each kneaded material was prepared. Specifically, Epofix cold embedding resin (two-component mixed type of epoxy resin and curing agent) is blended with 3 parts by mass of curing agent with respect to 25 parts by mass of epoxy resin to embed the required amount A resin was prepared.

  Next, the embedding resin was poured into the containers in which the respective kneaded materials were respectively stored so that the respective kneaded materials were completely immersed. And it left still until the resin for embedding | curing hardened | cured completely (at room temperature and about 25 degreeC, 7 to 8 hours). Thereby, a sample resin in which each kneaded material was embedded was produced.

  Next, the sample resin is taken out of the container and cut using a precision cutting machine (Isomet 1000 manufactured by BUEHLER) so that the kneaded material is positioned at the center of the cut surface, and each sample piece (thickness of about 5 mm to 7 mm). )

  The cut surface of each obtained test piece was polished by the following apparatus and conditions.

Polishing apparatus and polishing condition polishing machine: AUTOMET 3000 manufactured by BUEHLER
1) Initial polishing conditions Polishing paper count: 240, polishing paper base rotation speed: 50 rpm (1/60 s ⁻¹ ), sample pressure: 5-8, polishing time: 3-5 min
2) Second stage polishing conditions Polishing paper count: 600, polishing paper pedestal rotation speed: 50 rpm (1/60 s ^-1 ), sample pressure: 8-10, polishing time 3-5 min
3) Third-stage polishing conditions Instead of the polishing paper, polishing powder (MICROPOLISH 0.3) mixed with an appropriate amount of water was used.

Polishing base rotation speed: 60 rpm (1/60 s ⁻¹ ), sample pressure: 10-15, polishing time 5-10 min
About the range of 2 mm x 2 mm of the kneaded material in each polished test piece, the number of pores and the pore diameter were observed with a digital microscope (manufactured by KEYENCE: VHX-500, observation magnification: 100 times). FIG. 8 shows a digital microscope photograph of a cross section of the kneaded material of Example 2. Moreover, the digital microscope photograph of the cross section of the kneaded material of the comparative example 2 is shown in FIG.

  In Example 1, Example 3, and Comparative Example 1, five areas of 2 mm × 2 mm were observed.

  In Example 2, three areas of 2 mm × 2 mm were observed.

  In Comparative Example 2, two ranges of 2 mm × 2 mm were observed.

The abbreviations in Table 1 are shown below.
YSLV-80XY: Epoxy resin (manufactured by Nippon Steel Chemical Co., Ltd.)
MEH7851SS: Phenolic resin (Maywa Kasei)
2PHZ-PW: Imidazole (manufactured by Shikoku Chemicals)
SIBSTAR: Elastomer (polystyrene-polyisobutylene copolymer) (manufactured by Kaneka Corporation)
Filler: 0.1 part by mass of a silane coupling agent (KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) is added to 100 parts by mass of an inorganic filler (fused silica) (FB-9454, manufactured by Denki Kagaku Kogyo Co., Ltd.) , Surface treated.
# 20: Carbon black (Mitsubishi Chemical Corporation)

DESCRIPTION OF SYMBOLS 1 Kneading machine 2 Barrel 3 Kneading shaft 4 Introduction port 5 Discharge port 7 Vent part 11 Paddle part 12 Pipe part A Kneading object B Kneaded material

Claims (4)

A kneading machine comprising a barrel and a kneading shaft inserted into the barrel,
The barrel has an introduction part for introducing the object to be kneaded into the barrel on one end side, and a kneaded substance in which the object to be kneaded is discharged to the outside of the barrel on the other end side. And a discharge part of
The kneading shaft is disposed between the introduction portion and the discharge portion in the axial direction of the kneading shaft, a kneading portion for kneading the material to be kneaded, and disposed closer to the discharge portion than the kneading portion. A kneading machine comprising: a low-shear portion having a smooth surface extending so as not to be uneven along an axial direction of the shaft.   The kneading machine according to claim 1, wherein the low-shear portion is formed so as not to be uneven over the entire circumferential surface. The barrel includes a vent portion for discharging the gas in the barrel,
The kneading machine according to claim 1 or 2, wherein the vent portion is arranged closer to the introduction portion in the axial direction of the kneading shaft than the low shear portion. The said discharge part is arrange | positioned so that it may overlap with the said low shear part, when it projects in the direction orthogonal to the axial direction of the said kneading | mixing axis | shaft, It is characterized by the above-mentioned. The kneading machine described.