JP2001105426A - Kneading apparatus and method for dispersing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading apparatus having no riskiness of winding or the like, simple cleaning of itself and capable of suitably providing a large variety of coloring resin compositions for various tests in small quantities and to provide a method for dispersing a coloring agent into a thermoplastic resin by mixing and kneading the agent and the resin by using the apparatus. SOLUTION: In the kneading apparatus comprising a bottom member, a cylindrical wall member separable from the bottom member, a cover member separable from the wall member, and a columnar rotary shaft having a plurality of agitating blades each having a convection surface to the cover member side, the shaft is mounted at the bottom member so as to be substantially parallel to the member of the wall, the plurality of the blades are provided at different positions of the axial direction of the shaft so that the blades are provided at substantially opposite positions at the shaft as a center and gaps between the ends of the blades and the inner surfaces of the wall members is 5 mm at the maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for softening or melting a thermoplastic resin by using frictional heat when mixing and kneading a colorant and a thermoplastic resin, and adding the colorant into the thermoplastic resin. The present invention relates to a kneading device for dispersing and a dispersing method using the device.

[0002]

2. Description of the Related Art Conventionally, as a kneading / dispersing apparatus for mixing / kneading a colorant and a thermoplastic resin and dispersing the colorant in the thermoplastic resin, there are known two rolls, a pressure kneader, a Banbury mixer and the like. Various devices are used. However, in the case of kneading with two rolls, it is necessary to remove the colored resin composition during kneading from the rotating roll with a spatula or a scraper or the like, and then re-inject the colored composition between the rolls, and peel off. There is a danger of being caught in a roll at the time of reloading. If it is a large double roll, it is easy to take various safety measures,
It is extremely difficult to take various safety measures in the case of a small two-roll used when trying a colored resin composition of another type for various tests, as compared with a large-sized two-roll.

Further, when a colorant and a thermoplastic resin are mixed and kneaded using two rolls, the thermoplastic resin is first softened or melted using a heated two roll, and then softened or melted. Since it is necessary to knead the molten thermoplastic resin and the colorant, it takes a certain amount of time, for example, about 2 minutes, to soften or melt the thermoplastic resin. When a large amount of a colored resin composition is produced using a large two-roll, the effect on productivity is small even if a certain time is required for softening or melting the thermoplastic resin. However, when trying to obtain a small amount of a different type of colored resin composition for use in various tests, the type and amount of the colorant, the type and amount of the thermoplastic resin, and other various additives are changed. Since the thermoplastic resin must be softened or melted each time, the workability is poor.

In addition, when mixing and kneading using a pressure kneader, a Banbury mixer or the like, it is not necessary to melt the thermoplastic resin in advance as in the case of two rolls. Although there is little danger, since the structure of the apparatus is more complicated than that of the two rolls, cleaning the apparatus after mixing and kneading requires more time than the case of the two rolls. When a large-sized apparatus is used to produce a large amount of the colored resin composition, the effect on productivity is small even if a certain amount of time is required for cleaning the apparatus. However, when trying to obtain a small amount of a different type of colored resin composition for various tests, the type and amount of the colorant, the type and
Every time the amount or other various additives are changed, a certain time is required for cleaning the apparatus itself, so that the workability is extremely poor. In addition, in the case of a small device, the number of fine parts increases compared to the case of a large device, so much time must be spent for cleaning, and there is a limit to downsizing, and a pressure kneader, a Banbury mixer Etc. could not be put to practical use when trying to obtain a small amount of another kind of colored resin composition.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a kneading apparatus for mixing and kneading a colorant and a thermoplastic resin and dispersing the colorant in the thermoplastic resin. In addition, it is possible to easily clean the apparatus itself, to provide a kneading apparatus that can suitably provide a small amount of other types of colored resin compositions that can be subjected to various tests, and to provide a colorant using the kneading apparatus It is an object of the present invention to provide a method of mixing and kneading with a thermoplastic resin and dispersing the colorant in the thermoplastic resin.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by rotating a rotating shaft having a stirring blade having a specific function, there is no danger of entanglement or the like and good workability. The present inventors have found that the type of the colorant and the type of the resin can be changed frequently and easily, and completed the present invention. That is, the first invention provides a plurality of agitation having a bottom member, a cylindrical wall member separable from the bottom member, a lid member separable from the wall member, and a convection surface toward the lid member. A kneading device comprising: a cylindrical rotating shaft provided with blades;
The rotating shaft is attached to the bottom member such that the rotating shaft is substantially parallel to the member of the cylindrical wall, and the plurality of stirring blades are located at mutually different positions in the axial direction of the rotating shaft, and are adjacent to each other. The kneading apparatus is characterized in that they are provided at substantially opposite positions about the rotation axis, and the gap between the tip of the plurality of stirring blades and the inner surface of the cylindrical wall member is at most 5 mm.

According to a second aspect of the invention, the cross section of the stirring blade in a plane parallel to the axial direction of the rotating shaft is substantially rectangular, and the back surface of the convection surface of the stirring blade toward the lid member is formed by a cover member of the stirring blade. The kneading apparatus according to the first invention, wherein the kneading apparatus is substantially parallel to a convection surface on the side.

In a third aspect of the present invention, a plurality of agitating blades having a convection surface toward the lid member are provided, and a convection surface toward the bottom member is provided between the agitating blade located closest to the lid member and the lid member. The kneading apparatus according to the first or second invention, wherein the stirring blades provided are provided on a rotating shaft.

A fourth aspect of the present invention is directed to the same position in the axial direction of the rotary shaft provided with the stirring blade having a convection surface toward the bottom member, and to the opposite side about the rotary shaft and to the bottom member side. The kneading apparatus according to the third aspect of the present invention, further comprising another stirring blade having the convection surface described above.

A fifth invention is the kneading apparatus according to any one of the first to fourth inventions, wherein the rotating shaft is a vertical rotating shaft.

In a sixth aspect of the present invention, the bottom member and the lid member are provided so as to be substantially parallel to a plane orthogonal to the rotation axis. It is a kneading device.

In a seventh aspect of the present invention, the convection surfaces of the plurality of stirring blades having a convection surface toward the lid member are each inclined at 45 degrees or less with respect to a plane perpendicular to the rotation axis, and are inclined toward the bottom member. The kneading apparatus according to any one of the first to fifth inventions, wherein the rotating shaft can rotate in the direction.

According to an eighth aspect of the present invention, there is provided a kneading apparatus according to any one of the first to seventh aspects, wherein a colorant and a thermoplastic resin are accommodated in a kneading apparatus, and friction heat generated by rotating a rotating shaft is used. Then, the thermoplastic resin is melted, and the colorant is dispersed in the thermoplastic resin.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a kneading apparatus and a dispersing method according to the present invention will be described with reference to the drawings. FIG. 1 is a front view (schematic view) of a rotating shaft A provided with a stirring blade B having a specific function used in the kneading apparatus of the present invention.
B4) is shown. Stirring blades B1 to B4
As shown in FIG. 1, adjacent ones, ie, B1 and B2, B2 and B3, and B3 and B4 are located at different positions in the axial direction of the rotation axis A. The number of stirring blades having a specific function may be appropriately selected in consideration of the distance between the lid member and the bottom member, the ease with which the thermoplastic resin is softened or melted, and is limited to four. is not. In addition, the position of the stirring blade in the axial direction of the rotation axis A, the stirring blade may be provided so as to divide the length of the rotation axis A substantially equally, or provided on the lid member or on the bottom member. Is also good. Second
The figure is a right side view (schematic view) of the rotation axis A shown in FIG. Stirring blades B2, B4 located on the left side of rotation axis A
Is indicated by a broken line. The convection surface of each of the stirring blades B1 to B4 on the lid member side is 45 ° with respect to a plane orthogonal to the rotation axis.
The inclination is preferably not more than 30 degrees, more preferably not more than 30 degrees, and still more preferably 10 to 20 degrees. Although depending on the size of the stirring blade, when the stirring blade is inclined more than 45 degrees, the resistance tends to increase during dispersion, mixing and kneading, and there is an advantage that the thermoplastic resin can be quickly softened or melted. However, there is also a tendency to accelerate the thermal degradation of the thermoplastic resin. On the other hand, when the inclination of the stirring blade is smaller than 10 degrees, it is difficult to convect the colorant and the thermoplastic resin to the lid member side, and it is difficult to efficiently disperse, mix and knead the two.

In the kneading apparatus of the present invention, as shown in FIG. 3, the rotating shaft A is attached to the bottom member C so as to be substantially parallel to the cylindrical wall member D. Also, the third
The figure also shows a case where the bottom member C and the lid member E are provided so as to be substantially parallel to a plane orthogonal to the rotation axis.

FIG. 4 is a diagram (schematic diagram) of the rotating shaft A and the stirring blades viewed from above in FIG. 1, and among the stirring blades B1 to B4 having a specific function used in the kneading apparatus of the present invention. Adjacent stirring blades, ie, B1 and B2, B2 and B
3, B2 and B4 indicate that they are located substantially opposite about the rotation axis A, that is, about 180 degrees opposite about the rotation axis A. Thus, B1 and B2, B2 and B3, B2 and B4
However, when positioned substantially on a straight line around the rotation axis A, after dispersing, mixing and kneading the colorant and the thermoplastic resin, the kneaded material in a softened or molten state attached to the stirring blade and the rotation axis is removed. It becomes easier and workability is improved. That is, using a separable bottom member and a cylindrical wall member, a separable cylindrical wall member and a lid member, and after mixing and kneading in a state where each of the two members is firmly connected to each other, the lid member is removed. By separating from the cylindrical wall member and separating the cylindrical wall member from the bottom member, the kneaded matter adhering to the rotating shaft A and the stirring blade is exposed. And, since the stirring blade is located substantially in a straight line around the rotation axis A, the kneaded material on one side of the straight line formed by the stirring blade and the other side of the straight line formed by the stirring blade using a spatula, tweezers or the like. Kneaded material, stirring blades B1 and B3
, The kneaded material between the stirring blades B2 and B4, and the kneaded material between the stirring blades B3 and B4 and the bottom member can be easily peeled off. Particularly, the kneaded material between the stirring blades and between the stirring blades and the bottom member can be peeled off at once from a certain direction.

On the other hand, even if B1 and B2 and B3 and B4 are positioned substantially in a straight line about the rotation axis A as shown in FIGS. Is not located on a straight line around the center, or B1 and B2, B2 and B3, and B3 and B4 are not located on a straight line around the rotation axis A as shown in (c) and (2) of FIG. The dispersion / mixing / kneading itself is possible without much difference from the case shown in FIGS. 1 to 4, but after the dispersion / mixing / kneading, the lid member is separated from the cylindrical wall member and the cylindrical wall member is Even if the kneaded material separated from the material and adhering to the rotating shaft A and the stirring blade can be exposed,
Since the stirring blades are not on a straight line when viewed from above the rotation axis A, the kneaded material on one side and the other side of the stirring blades cannot be peeled off at a stretch. Further, since the kneaded material between the stirring blades and between the stirring blades and the bottom member cannot be peeled off at once from a certain direction, workability is poor.

The stirring blades B1 to B4 having a specific function used in the kneading apparatus of the present invention each have a convection surface a toward the lid member. That is, the rotation axis A is set so that the direction inclined toward the bottom member side of the stirring blades B1 to B4 becomes the leading direction of rotation.
By rotating, the colorant and the thermoplastic resin on the bottom member side can be scraped up to the lid member side.
The stirring blade has such a scraping function, so that the colorant and the thermoplastic resin can be efficiently dispersed in a short time.
Mixing and kneading become possible. Here, the stirring blade B1
The gap between the tip of B4 and the inner surface of the cylindrical wall member D is at most 5 mm, preferably 3 mm or less, more preferably 0.5 to
By setting the thickness to 1 mm, the thermoplastic resin can be easily softened or melted by frictional heat without providing special heating means. In the case of a conventional two-roll mill, it was necessary to melt the thermoplastic resin before kneading, but in the apparatus of the present invention, the gap between the tip of the stirring blade and the inner surface of the cylindrical wall member D was determined. As described above, such a need is eliminated. That is, the colorant and the thermoplastic resin are put into a kneading apparatus, and the lid member is firmly bonded to the cylindrical wall member, that is, after the hermetically sealed state, the rotating shaft is rotated to easily produce the thermoplastic resin by frictional heat. The colorant can be dispersed, mixed, and kneaded in the softened or molten thermoplastic resin in a short time while being softened or melted. When using a thermoplastic resin that easily softens or melts, the colorant can be sufficiently dispersed / mixed / kneaded even in the case of a relatively wide gap, but if it is wider than 5 mm, the dispersion / mixing / kneading of the colorant is hindered. In order to ensure the same state of dispersion, mixing and kneading, or the same degree of dispersion / mixing / kneading, mixing / kneading for a longer time is required.

FIGS. 6 (1) to (4) schematically show modes in which various types of stirring blades B1 to B4 are attached to the rotating shaft A of the kneading apparatus of the present invention. B2 and B4 located on the opposite side of the rotation axis A are not shown. (4)
Is the same as that shown in FIG. 2, and the back surface of the convection surface a of the stirring blade toward the cover member E side is the cover member E of the stirring blade.
This is the case where the convection surface a is substantially parallel to the side. (3)
Is a lid member E of the stirring blade B1 located near the lid member E side.
The back surface of the convection surface a to the side is the cover member E of the stirring blade B1.
This is a case where the cross section of the stirring blade B3, which is substantially parallel to the convection surface a toward the side and is located near the bottom member C side, has a substantially triangular shape. (2) is a case where the cross section of the stirring blade B1 located close to the lid member E side is substantially triangular, contrary to (3), and the lid member E of the stirring blade B3 located close to the bottom member C side.
The back surface of the convection surface a to the side is the cover member E of the stirring blade B3.
This is the case where the convection surface a is substantially parallel to the side. (1)
Is a case where the cross sections of the stirring blades B1 and B3 have a substantially triangular shape.

In the above (1) to (4), the stirring blades B2 and B4 located on the opposite side of the rotation axis A are not shown by broken lines, but in (1) the stirring blades B2 and B4 are also replaced by the stirring blades B1 and B1. The back surface of the convection surface a of the stirring blades B2 and B4 toward the lid member E may be substantially the same as the convection surface a of the stirring blades B2 and B4 toward the lid member E. The back surface of the convection surface a of the stirring blade B2 on the lid member E side may be parallel to the convection surface a of the stirring blade B2 on the lid member E side. The cross section may have a substantially triangular shape, or the back surface of the convection surface a of the stirring blade B4 toward the cover member E may be substantially parallel to the convection surface a of the stirring blade B4 toward the cover member E. Feather B2
May have a substantially triangular cross section. Similarly (2)-
Also in (4), the stirring blades B2 and B4 have a convection surface a toward the lid member E, and are located at different positions in the axial direction of the rotation axis A from B1 and B3. , Except that the tip of the stirring blade has a gap of at most 5 mm with the inner surface of the cylindrical wall member D. There is no particular limitation on the shape and the like. Therefore, (2)
In (3), both the stirring blades B2 and B4 may have the same shape as B1, or one of the stirring blades may have the same shape as B1, and the other may have the same shape as B3. B4 may have the same shape as B3.
In (4), both stirring blades B2 and B4 may have the same shape as B1 and B3, or one of them may have the same shape as B1 and the other may have the same shape as B3 in case (3). Alternatively, both the stirring blades B2 and B4 may have the same shape as B3 in the case of (3).

FIGS. 7 and 8 show a case where a further stirring blade F is provided near the bottom member C of the rotating shaft A in each case shown in FIG. FIG. 7 shows a case in which another stirring blade F located near the bottom member C is provided at substantially the same position in the axial direction of the rotation axis A and substantially 180 degrees opposite to the rotation axis A. Is shown. The stirring blade F is
As shown in (6), (9), (12), and (15) in the figure, similarly to the stirring blades B1 to B4, a convection surface a toward the lid member may be provided, and (5), (7), (8) ) (10) (11) (1
3) As shown in (14) and (16), a sectional shape may be used.
The gap between the tip of the stirring blade F and the inner surface of the cylindrical wall member is also preferably up to about 5 mm, more preferably 3 mm or less, as in the case of the stirring blades B1 to B4.
More preferably, it is 0.5 to 1 mm. When the rotation axis A is a vertical rotation axis, the colorant and the thermoplastic resin are likely to stay on the bottom member side, and therefore, (6), (9), (1) in FIG.
2) It is preferable to provide a stirring blade F having a convection surface a toward the lid member side as shown in (15).

FIG. 9 shows a case where, among the stirring blades having the convection surface a toward the lid member, the stirring blade located closest to the lid member is the stirring blade G having the convection surface b toward the bottom member. Is shown. FIG. 10 shows a case where the stirring blade B1 near the lid member shown in (1) to (4) of FIG. 6 is a stirring blade G having a convection surface b toward the bottom member, and a cross section of the stirring blade G. Is the shape shown in (17) and (18), (19) and (2)
The shape shown in FIG. The gap between the tip of these stirring blades G and the inner surface of the cylindrical wall member is also determined by the stirring blades B1 to B
As in the case of No. 4, it is preferable that the maximum is about 5 mm. By providing the stirring blade G having the convection surface b to the bottom member side near the lid member, the colorant and the thermoplastic resin scooped up to the lid member side by the stirring blade having the convection surface a to the lid member side are removed. The colorant and the thermoplastic resin can be efficiently dispersed, mixed and kneaded with the stirring blade G having the convection surface b toward the bottom member.

FIG. 11 is another view of the same position in the axial direction of the rotation axis of the stirring blade G shown in FIG. 10 and having a convection surface b on the side opposite to the rotation axis toward the bottom member. This is a case where the stirring blade G is provided, and a case where another stirring blade F is further provided between the bottom member C and the stirring blades B3 and B4. (21) to (32) of FIG. 12 show various modes of the stirring blade G, the stirring blade B3, and the stirring blade F shown in FIG. Stirring blades B2, B4 located on the opposite side of rotation axis A
Is not shown.

The rotating shaft of the kneading apparatus of the present invention is located outside the bottom member (on the side opposite to the side where the cylindrical member is provided) or outside the lid member (with the side where the cylindrical member is provided). Is mounted rotatably on a motor located on the opposite side) and can be rotated by said motor. For example, a rotation shaft is provided to penetrate the bottom member, or a rotation shaft is provided to penetrate the lid member. Then, the rotating shaft is attached to the motor placed outside the bottom member or the outside of the lid member by some means, and the stirring blade provided on the rotating shaft is formed in a direction in which a convection surface toward the lid member side can be formed. What is necessary is just to rotate a rotating shaft. Preferably, the rotating shaft is attached to the motor so that it can be easily separated. Hereinafter, a case where a motor is installed outside the bottom member will be described. Screw-shaped irregularities are provided at the lower part of the rotating shaft penetrating the bottom member, and have irregularities of the rotating shaft and screw-shaped irregularities corresponding to the irregularities of the rotating shaft, and reflect the rotation of the motor on the rotating shaft. Attach the cylindrical member, put the colorant and thermoplastic resin in the state of firmly engaging the unevenness of the member that can be made, put the colorant and thermoplastic resin, attach the lid member, rotate the rotating shaft, disperse the colorant and thermoplastic resin・ Mix and knead.
Thereafter, the lid member is removed, the cylindrical member is removed, the engagement of the screw-like irregularities below the rotating shaft is loosened, and the rotating shaft can be removed from the member that can reflect the rotation of the motor on the rotating shaft. By making the rotating shaft easily separable in this way, it is possible to easily remove the resin composition of the colorant and the thermoplastic resin after dispersion, mixing, and kneading.
Incidentally, the cylindrical wall member in the kneading apparatus of the present invention, the inner surface may have a cylindrical place, a portion attached to the bottom member,
The shape of the part to be attached to the lid member is not particularly limited.
Also, on the inner surface of the cylindrical wall member, a groove may or may not be provided, but it is preferable to provide a groove.
It is preferable to provide a plurality of grooves substantially parallel to the axial direction of the rotation shaft. Furthermore, the screw-shaped unevenness at the lower part of the rotating shaft and the unevenness of the member capable of reflecting the rotation of the motor on the rotating shaft, the bottom member and the cylindrical member, the cylindrical member and the lid member, all rotate the rotating shaft. It is, of course, important that you do not come off when you are.

The coloring agent used in the dispersion method of the present invention includes chromatic pigments and achromatic pigments, as well as so-called processed pigments using these chromatic or achromatic pigments. Here, the term "processed pigment" refers to a pigment obtained by previously mixing the pigment and wax, a pigment obtained by kneading the pigment and a thermoplastic resin, and the like.

[0026]

According to the present invention, it is possible to disperse, mix and knead a colorant and a thermoplastic resin without danger of entanglement and the like, and to remove and knead the kneaded material easily and easily with good workability. As a result, the colorant type and the resin type can be changed frequently and easily, and a small amount of other types of coloring compositions can be obtained safely and easily for various tests.

[Brief description of the drawings]

FIG. 1 is a front view of a rotating shaft A provided with a stirring blade B having a specific function used in the kneading apparatus of the present invention. FIG. 2: Right side view of the rotation axis A shown in FIG. FIG. 3 shows a kneading apparatus of the present invention in which a bottom member and a lid member are provided so as to be substantially parallel to a plane orthogonal to the rotation axis. FIG. 4: A view of the rotating shaft A and the stirring blade as viewed from above in FIG. FIG. 5: The case where adjacent stirring blades are not located on the center straight line with the rotation axis. (A): A view of the rotating shaft A and the stirring blade viewed from above (B). (B): Even if the stirring blades B1 and B2 and the stirring blades B3 and B4 are positioned substantially in a straight line about the rotation axis A, the stirring blades B2 and B3 are about the rotation axis A. (C): A view (schematic diagram) of the rotating shaft A and the stirring blade viewed from above (d). (D): The rotating shaft A includes the stirring blade B1 and the stirring blade B2, the stirring blade B2 and the stirring blade B3, and the stirring blade B3 and the stirring blade B4.
When not located on a straight line around the center. FIG. 6: Side views showing various aspects of the stirring blades B1, B3 attached to the rotating shaft A of the kneading apparatus of the present invention. FIG. 7: Rotation axis A in each case shown in FIG.
In the case where another stirring blade F is further provided near the bottom member C (front view). FIG. 8: Rotation axis A in each case shown in FIG.
FIG. 4 is a side view showing a case where a further stirring blade F is provided near the bottom member C of FIG. 1 and shows various aspects of the stirring blades B1, B3 and the stirring blade F attached to the rotating shaft A. FIG. 9: In the kneading apparatus of the present invention, among the stirring blades having the convection surface a toward the lid member, the stirring blade located closest to the lid member is stirred with the convection surface b toward the bottom member side. When the blade G is used. FIG. 10: A case where the stirring blade B1 near the lid member shown in (1) to (4) of FIG. 6 is a stirring blade G having a convection surface b toward the bottom member. FIG. 11: Another stirring blade G having a convection surface b toward the bottom member at the same position in the axial direction of the rotation shaft of the stirring blade G shown in FIG. In the case where it is provided, another stirring blade F is further provided between the stirring members B3 and B4 and the bottom member C. FIG. 12: Various modes of the stirring blade G, the stirring blade B3, and the stirring blade F attached to the rotating shaft A shown in FIG.

[Explanation of symbols]

A: cylindrical rotating shaft B: stirring blade having a convection surface toward the lid member C: bottom member D: cylindrical wall member E: lid member F: another stirring provided closer to the bottom member than stirring blade B Feather. G: A stirring blade having a convection surface toward the bottom member. a: Convection surface of the stirring blade toward the lid member. b: The convection surface of the stirring blade toward the bottom member.

Claims (8)

[Claims] 1. A bottom member, a cylindrical wall member separable from the bottom member, a lid member separable from the wall member, and a plurality of stirring blades having a convection surface toward the lid member. A rotating shaft having a cylindrical shape, wherein the rotating shaft is attached to a bottom member such that the rotating shaft is substantially parallel to the cylindrical wall member, and the plurality of stirring blades are: The agitating blades adjacent to each other are provided at different positions in the axial direction of the rotating shaft and at substantially opposite positions around the rotating shaft, and the tip portions of the plurality of agitating blades and the cylindrical wall member are provided. A kneading apparatus characterized in that the gap with the inner surface is at most 5 mm. 2. The stirring blade has a substantially quadrangular cross section in a plane parallel to the axial direction of the rotation shaft, and the back surface of the convection surface of the stirring blade toward the lid member has a convection toward the lid member side of the stirring blade. 2. The kneading apparatus according to claim 1, wherein the kneading apparatus is substantially parallel to the plane. 3. A stirring blade having a convection surface toward a bottom member is provided between a stirring blade located closest to the cover member and the lid member among a plurality of stirring blades having a convection surface toward the cover member. 3. The method according to claim 1, wherein the rotating shaft is provided on the rotating shaft.
The kneading apparatus according to the above. 4. The same position in the axial direction of a rotating shaft provided with a stirring blade having a convection surface toward a bottom member,
The other stirring blade having a convection surface to the bottom member side is further provided on a side opposite to the rotation axis.
The kneading apparatus according to the above. 5. The kneading apparatus according to claim 1, wherein the rotating shaft is a vertical rotating shaft. 6. The kneading apparatus according to claim 1, wherein the bottom member and the lid member are provided so as to be substantially parallel to a plane orthogonal to the rotation axis. 7. The convection surface of each of the plurality of stirring blades having a convection surface toward the lid member is inclined at an angle of 45 degrees or less with respect to a plane orthogonal to the rotation axis, and toward a direction inclined toward the bottom member. And a rotating shaft can rotate.
7. The kneading apparatus according to any one of items 6 to 6. 8. A kneading apparatus according to claim 1, wherein a colorant and a thermoplastic resin are contained, and the thermoplastic resin is softened or softened by utilizing frictional heat generated by rotating a rotating shaft. A method of melting and dispersing the colorant in the thermoplastic resin.