JP7329988B2 - Two-roll kneader - Google Patents

Description

The present invention relates to a batch-type two-roll kneader for kneading a material to be processed between two rolls.

A two-roll type kneader is often used when mixing polymeric compounds such as thermoplastic resins, thermosetting resins, and elastomers with other polymeric compounds, various fillers, pigments, and the like. This two-roll type kneader has two rolls arranged parallel to each other at the same height with a small gap between them, and both rolls rotate in the direction from top to bottom at the gap. .

As a two-roll type kneader, the material to be processed is continuously supplied from one end of the roll, and the material to be processed is wound around one of the rolls and fed to the other end of the roll while being kneaded. A roll kneader is known (see, for example, Patent Document 1). In this continuous two-roll type kneader, in order to wind the material around only one of the rolls, a relative speed difference is provided in the rotation speed of both rolls, or a relative temperature difference is provided in the surface temperature of both rolls. set up. In addition, a spiral groove is formed on the surface of the roll in order to feed the material to be processed from one end of the roll to the other end. Furthermore, water, hot water, and heat medium oil are used as the heat medium. Then, the processed material kneaded by a pelletizer provided at the other end of the roll is made into a granular product.

In addition, a batch-type two-roll type kneader equipped with a pair of regulating members called "width adjusting plates" that contact the upper parts of both rolls and move in the axial direction to prevent the material to fall from both ends of the rolls. is known (see, for example, Patent Document 2). Here, the batch-type two-roll type kneader disclosed in Patent Document 2 promotes kneading by changing the interval between a pair of regulating members in the kneading process. In addition, this batch-type two-roll type kneader is equipped with a scraper for stripping a part of the processed material wound around the roll surfaces, and a conveying device for returning the stripped processed material to the upper part of both rolls. Automatically perform the work of "cutting back". Therefore, it has a complicated mechanical configuration.

JP-A-9-267328 JP-A-4-29805

Problems of the conventional two-roll kneader will be described with reference to FIG. A batch-type two-roll kneader 110 includes two rolls 121 and 122 and a pair of regulating members 131 and 132, as shown in FIG. 3(a). When kneading by the two-roll type kneader 110, as shown in FIG. A portion of the article 190 forms a bank portion 192 between both rolls 121,122.

When a small amount of coloring agent is added to the bank portion 192 during the kneading process, a band-like colored portion 181 is formed on the sheet portion 191 as shown in FIG. 3(c). However, in both the sheet portion 191 and the bank portion 192 , the material to be processed 190 mixes very slowly in the axial direction. Therefore, it is necessary to cut back a part of the sheet portion 191 with a scraper and send it to the bank portion 192 by a conveying device to promote mixing in the axial direction in the bank portion 192 .

That is, although the conventional continuous two-roll type kneader is suitable for processing a large amount of material, its kneading performance is limited. On the other hand, in a batch-type two-roll type kneader, the kneading performance can be improved by performing a turning operation, but the turning operation requires time, resulting in a long processing time. In addition, in the case of automatically performing the turning work, a complicated and large-scale conveying device is required, and the processing work becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a two-roll type kneader capable of performing high-performance kneading in a short period of time.

In order to achieve the above object, the two-roll type kneader of the present invention consists of a first roll and a second roll, two rolls for performing kneading treatment by winding the processed material around the first roll, and two rolls. a pair of regulating members arranged at a predetermined interval along the axial direction of the rolls and movable in the axial direction while contacting the two rolls; and a moving means for moving the pair of regulating members. , is equipped with The first roll has a faster rotational speed than the second roll and has a smooth surface. On the surface of the second roll, a first groove formed on one end side of the second roll to send the processed material toward one end of the second roll, and a groove formed on the other end side of the second roll to A second groove is formed for feeding the workpiece toward the other end. The moving means moves the pair of regulating members in the same direction with a predetermined gap from a state in which all the grooves in the kneading region sandwiched by the pair of regulating members are the first grooves, thereby moving the kneading region. along the axial direction of the two rolls so that the grooves in the kneading area are all second grooves .

In the two-roll kneader of the present invention, the movement of the material to be treated is restricted by the pair of restricting members, and the kneading area is defined by the pair of restricting members. Then, when all the grooves in the kneading region are the first grooves, when all the grooves in the kneading region are the second grooves, and when the kneading region includes the first grooves and the second grooves, the kneading The direction in which the material is fed in the area is different, and in each case different kneading action can be given to the material. Therefore, by moving the pair of regulating members by the moving means and moving the kneading region in the axial direction of the rolls, different kneading actions can be sequentially applied to the processed material, and kneading performance can be improved. Therefore, a high-performance kneading process can be performed in a short time.

1 shows a two-roll kneader of Example 1, (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic cross-sectional view taken along line AA. FIG. 2 is an explanatory diagram for explaining the kneading state in the two-roll type kneader of Example 1, (a) showing the state before addition of the colorant, and (b) the kneading state in the first kneading region after the addition of the colorant. , (c) shows the kneading state when moving from the first kneading area to the third kneading area, and (d) shows the moving state when moving from the third kneading area to the second kneading area. 1 shows a conventional two-roll type kneader, (a) is a schematic plan view, (b) is a schematic side view, and (c) shows a kneading state when a coloring agent is added.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the two roll type kneader of this invention is demonstrated based on Example 1 shown on drawing.

(Example 1)
The configuration of the two-roll kneader 10 of Example 1 will be described below with reference to FIG. Note that FIG. 1 shows only the main part of the two-roll type kneader 10 and omits the driving part of the scraper 60 that has been used conventionally.

The two-roll type kneader 10 of Example 1 is supported at the same height by a base (not shown), and the first roll 21 and the second roll 22 arranged in parallel with the axial direction Two rolls 21 and 22 are provided. The first roll 21 and the second roll 22 are arranged with a minute gap, and this gap can be adjusted. The first roll 21 is rotatably supported by bearings 51 and 52 , and the second roll 22 is rotatably supported by bearings 53 and 54 . The first roll 21 and the second roll 22 are driven to rotate in opposite directions by a driving device (not shown) such as an electric motor, and rotate in the direction from above to below in the gap portion. In addition, the operator mainly operates from the first roll 21 side.

Here, the first roll 21 and the second roll 22 may be separately driven to rotate by two driving devices, or one of the rolls may be driven to rotate by one driving device and a transmission device such as a gear may be driven. can be used to drive the other roll in rotation. Further, the number of rotations and the rotation speed of both rolls 21 and 22 can be arbitrarily adjusted.

Furthermore, the first roll 21 and the second roll 22 are each provided with a heating means, so that the surface temperature can be adjusted to be suitable for the kneading process. As a heating means, a method using thermal oil and a method using an electric heater are generally used. Both rolls 21, 22 are temperature controllable.

The kneading process in the two-roll type kneader 10 is performed in a state in which the material to be treated is wound only around the first roll 21 . In addition, the processed material is kneaded in a state of being wrapped around the entire circumference of the first roll 21 . For this reason, the rotational speed of the first roll 21 is made faster than the rotational speed of the second roll 22 . Further, in the two-roll type kneader 10 of Example 1, a temperature difference is also provided between the surface temperatures of both the rolls 21 and 22 .

The two-roll type kneader 10 also includes a pair of regulating members 31 and 32 which are in contact with the upper portions of both rolls 21 and 22 and arranged axially at a predetermined interval. Two arc-shaped curved surfaces 31 a and 31 b are formed on the lower surface of one of the restricting members 31 . Each curved surface 31a, 31b is in contact with the surface of both rolls 21, 22, respectively, as shown in FIG.1(c). Also, two arc-shaped curved surfaces (not shown) are formed on the lower surface of the other regulating member 32, and the curved surfaces are in contact with the surfaces of the rolls 21 and 22, respectively. Both rolls 21 and 22 are rotatable while being in sliding contact with a pair of regulating members 31 and 32 .

Since the pair of regulating members 31 and 32 are brought into contact with both rolls 21 and 22, the material to be kneaded between the pair of regulating members 31 and 32 is kneaded without exceeding the regulating members 31 and 32. will receive. That is, the area sandwiched by the pair of regulating members 31 and 32 serves as a kneading area for kneading the processed material.

Furthermore, as shown in FIG. 1(b), the base (not shown) is provided with moving means 33 for moving the restricting members 31 and 32 along the axial direction. The moving means 33 has a first arm 35 to which one of the restricting members 31 is fixed at the tip, and a second arm 36 to which the other restricting member 32 is fixed at the tip. One restricting member 31 is moved along the axial direction while contacting both rolls 21 and 22 by moving the first arm 35 in the horizontal direction. The other regulating member 32 is moved along the axial direction while contacting both the rolls 21 and 22 by moving the second arm 36 in the horizontal direction.

The moving means 33 can move the first arm 35 and the second arm 36 individually. Therefore, by moving the first arm 35 and the second arm 36 in the same direction, the moving means 33 moves the pair of regulating members 31 and 32 between the two rolls 21 and 22 with a predetermined gap therebetween. Move from the one end 23 toward the other end 24, or move the pair of regulating members 31 and 32 from the other end 24 of the two rolls 21 and 22 toward the one end 23 while leaving a predetermined gap. do.

Further, the moving means 33 can move the pair of restricting members 31 and 32 in the same direction simultaneously by the same distance and at the same speed. In this case, the pair of regulating members 31 and 32 move the kneading area in the axial direction while maintaining the size of the kneading area constant.

Further, the moving means 33 moves the first arm 35 and the second arm 36 in opposite directions at the same time, thereby bringing the pair of restricting members 31 and 32 closer to each other or separating them. That is, the moving means 33 can adjust the width of the gap between the pair of restricting members 31 and 32 . As a result, the pair of regulating members 31 and 32 can change the width of the space provided between them to widen or narrow the kneading region. As a result, the size and position of the kneading area are restricted according to the positions of the regulating members 31 and 32 .

When the moving means 33 does not move the first and second arms 35 and 36, the movement of the pair of restricting members 31 and 32 is stopped, and the size and position of the kneading area are maintained. Further, it is preferable that the moving means 33 automatically moves the first and second arms 35 and 36 using an electric motor or the like, but the first and second arms 35 and 36 can also be manually moved by an operator. is.

Furthermore, in the two-roll type kneader 10 of Example 1, the spiral grooves M are formed on the surface of the second roll 22 so that the material being kneaded can be sent in the axial direction. The grooves M are a first groove 25 formed on the surface from one end 22a of the second roll 22 to the central portion, and a second groove 26 formed on the surface from the other end 22b of the second roll 22 to the central portion. and have

The 1st groove|channel 25 is a groove|channel which, when the 2nd roll 22 rotates, sends a process material toward the one end 22a from a center part. The second groove 26 is set to have a twist direction opposite to that of the first groove 25, and is a groove that feeds the material to be treated from the central portion toward the other end 22b when the second roll 22 rotates. Here, the first groove 25 and the second groove 26 are continuous at the central portion of the second roll 22 . Therefore, the surface of the second roll 22 does not have a smooth surface region where the grooves M are not provided, and the grooves M are twisted in the opposite direction from the central portion of the second roll 22 .

Also, the shape of the first and second grooves 25 and 26 can be set as appropriate, for example, the width is 5 mm and the depth is 1 mm. At this time, it is preferable to have a shape that facilitates cleaning after the end of the kneading process. Furthermore, by forming the first and second grooves 25 and 26 with two or more multi-threaded threads, it is possible to ensure and speed up the feeding of the processed material. In addition, it is preferable that the first roll 21 has a smooth surface.

The scraper 60 is arranged below the two rolls 21 and 22 and is driven by a drive unit (not shown) so that the tip 61 is brought into contact with the first roll 21 as appropriate. As a result, the material wound around the first roll 21 is cut by the scraper 60 and stripped from the roll surface of the first roll 21 .

The operation of the two-roll kneader 10 of Example 1 will be described below.

The two-roll type kneader 10 of Example 1 has a pair of regulating members 31 and 32 that are axially movable with a predetermined gap therebetween, and a groove M that is twisted in opposite directions from the central portion. By providing the second roll 22 formed on the surface, kneading processing using kneading regions having different kneading states can be performed in one batch process.

That is, the case where all the grooves M in the kneading region are the first grooves 25 is called the "first kneading region", and the case where the grooves M in the kneading region are all the second grooves 26 is called the "second kneading region". A case in which the first groove 25 and the second groove 26 are included in the kneading area is called a "third kneading area". In the “first kneading area”, the processed material is sent toward one end 22 a of the second roll 22 . Also, in the “second kneading area”, the processed material is sent toward the other end 22 b of the second roll 22 . Further, in the "third kneading area", the processed material is divided and sent toward both ends at the boundary between the first groove 25 and the second groove 26. - 特許庁

On the other hand, if the pair of regulating members 31 and 32 are moved in the same direction, for example, from one end 23 to the other end 24 of the two rolls 21 and 22 while keeping a predetermined gap during the kneading process, , the kneading area changes from the "first kneading area" to the "third kneading area", and further changes from the "third kneading area" to the "second kneading area". As a result, in one batch process, the kneading state can be changed in order, and different kneading actions can be given during the kneading process. As a result, by simply moving the pair of regulating members, excellent kneading performance can be exhibited without performing switching work, and high-performance kneading can be performed in a short time.

Hereinafter, based on FIG. 2, the relationship between the positions of the pair of restricting members 31 and 32 and the kneading state will be specifically described.

When the material to be processed 90 is kneaded in the two-roll type kneader 10 of Example 1, part of the material to be processed 90 is wound around the surface of the first roll 21 to form the sheet part 91, and part of the material to be processed 90 is formed on both rolls 21. , 22 is formed at the upper portion thereof. By arranging the pair of regulating members 31 and 32 at the positions where the first grooves 25 are formed, all the grooves M in the kneading region are the first grooves 25, as shown in FIG. 2(a). The processed material 90 can be kneaded in the first kneading area. At this time, the processed material 90 is sent toward the one end 22a of the second roll 22 by the action of the first groove 25, so the processed material 90 is biased toward the one end 23 side.

A small amount of coloring agent is introduced into the central portion of the bank portion 92 while the processed material 90 is being kneaded in the first kneading area. The introduced colorant is sent toward one end 22a of the second roll 22 by the action of the first groove 25, and as shown in FIG. A colored portion 81 that spreads toward is formed.

On the other hand, the pair of regulating members 31 and 32 are simultaneously moved by the same distance and at the same speed from one end 23 to the other end 24 of the two rolls 21 and 22 during kneading of the processed material 90 . Therefore, the kneading area moves from one end 23 toward the other end 24 while maintaining its size (length in the axial direction). By maintaining the size of the kneading area, the material to be processed 90 is properly kneaded without spreading or being crushed in the axial direction. Also, at this time, the processed material 90 is pressed toward the other end 24 while being kneaded. Therefore, the action of the first grooves 25 promotes mixing in the axial direction while feeding to the one end 22a side of the second roll 22 .

Then, when the other regulating member 32 moves to the position where the second groove 26 is formed, the processed material 90 is kneaded in the third kneading area including the first groove 25 and the second groove 26 in the kneading area. Become so. At this time, as shown in FIG. 2( c ), the part of the workpiece 90 that contacts the second groove 26 is fed toward the other end 22 b of the second roll 22 . Therefore, a part of the colored portion 81 formed on the sheet portion 91 gradually spreads toward the other end 22 b of the second roll 22 .

Then, the pair of regulating members 31 and 32 are further moved toward the other end 24 of the two rolls 21 and 22, and both of the pair of regulating members 31 and 32 move to the position where the second groove 26 is formed. 2(d), the material 90 is kneaded in the second kneading area where all the grooves M in the kneading area are the second grooves 26. As shown in FIG. As a result, the processed material 90 is sent toward the other end 22b of the second roll 22 by the action of the second groove 26, so that the processed material 90 is biased toward the other end 24 side. Also, the colored portion 81 spreads rapidly toward the other end 22 b of the second roll 22 .

Thus, in the two-roll type kneader 10 of Example 1, while the pair of regulating members 31 and 32 are moved from the one end 23 to the other end 24 of the two rolls 21 and 22, the sheet portion 91 is Thus, the kneading action in the first kneading zone, the kneading action in the third kneading zone, and the kneading action in the second kneading zone can be given in order. For this reason, by moving the object 90 from one end 23 to the other end 24 of the two rolls 21 and 22, it is possible to exhibit an effect equivalent to that of performing conventional turning over a plurality of times, and the entire area of the sheet portion 91 is colored. The portion 81 can be rapidly diffused, and excellent kneading performance can be exhibited. In addition, since the processed material 90 is constantly pressed toward the other end 24 during kneading, the kneading action in the axial direction can be promoted, and the kneading performance can be further improved.

The two-roll kneader 10 of Example 1 is equipped with a scraper 60 . Therefore, by bringing the tip 61 of the scraper 60 into contact with the first roll 21, the sheet portion 91 can be scraped off from the roll surface of the first roll 21, collected in a suitable container, and made into a product.

Furthermore, in Example 1, the rotational speed of the first roll 21 is faster than the rotational speed of the second roll 22 . Here, by providing a rotation speed difference between the rolls, the processed material is more likely to wind around the roll having a higher rotation speed. Therefore, by making the rotation speed of the first roll 21 faster than that of the second roll 22, the processed material can be wound around the first roll 21 in which no groove is formed. Since the first roll 21 has no grooves, the scraper 60 can easily scrape off the sheet portion 91 .

Further, after moving the pair of regulating members 31 and 32 from the one end 23 toward the other end 24 of the two rolls 21 and 22, they are moved again from the other end 24 toward the one end 23 while continuing the kneading operation. Then, the processed material 90 can be kneaded in order by the second kneading area, the third kneading area, and the first kneading area. That is, by reciprocating the pair of regulating members 31 and 32 between the one end 23 and the other end 24 of the two rolls 21 and 22, a higher kneading effect can be obtained. As the number of reciprocations is increased, the kneading effect can be improved.

In this first embodiment, the first groove 25 for sending the processed material 90 to the one end 22a of the second roll 22 is formed on the surface of the second roll 22 on the one end 22a side, and the processed material 90 is moved to the second roll 22. A second groove 26 for feeding to the other end 22b is formed on the surface of the second roll 22 on the other end 22b side. Therefore, the processed material 90 is sent toward the end of the second roll 22 regardless of the position of the kneading area. As a result, it is possible to prevent the processed material 90 from gathering in the central portion of the second roll 22, thereby improving the kneading performance.

Moreover, in Example 1, the first groove 25 and the second groove 26 are continuously formed in the central portion of the second roll 22, and the surface of the second roll 22 is formed with a flat area. do not have. Therefore, during kneading, the material to be processed 90 is sent in the axial direction without stagnation, and kneading can be promoted.

Although the two-roll kneader of the present invention has been described above based on Example 1, the specific configuration is not limited to this example, and can be set forth in each claim of the scope of claims. Design changes, additions, etc. are permitted as long as they do not deviate from the gist of the invention.

In the two-roll type kneader 10 of Example 1, an example in which the first groove 25 and the second groove 26 are formed so as to divide the second roll 22 into two is shown, but the present invention is not limited to this. For example, a plurality of first grooves 25 and second grooves 26 may be alternately formed along the axial direction of the second roll 22 . Alternatively, the first groove 25 may be formed on the other end 22b side of the second roll 22 and the second groove 26 may be formed on the one end 22a side of the second roll 22 . Furthermore, the first groove 25 and the second groove 26 do not necessarily have to be continuous, and a flat surface on which the grooves M are not formed may be provided on a part of the surface of the second roll 22 .

Further, in the two-roll type kneader 10 of Example 1, the pair of regulating members 31 and 32 are moved from one end 23 to the other end 24 of the two rolls 21 and 22, and the kneading area at this time is Although an example of maintaining the size has been shown, the present invention is not limited to this. For example, the pair of regulating members 31 and 32 may be moved while widening or narrowing the kneading area, or the pair of regulating members 31 and 32 may be moved from the other end 24 of the two rolls 21 and 22 to the one end 23 . You can move it towards In other words, the direction and speed of movement of the pair of regulating members 31 and 32 and the size of the kneading region during movement can be appropriately set.

10 Two-roll kneader 21 First roll 22 Second roll 22a One end 22b Other end 23 One end 24 Other end 25 First groove 26 Second groove 31 Regulating member 32 Regulating member 33 Moving means 60 Scraper 61 Tip 90 Processed material M groove

Claims (4)

In a two-roll type kneader equipped with two rolls consisting of a first roll and a second roll, and kneading by winding the processed material around the first roll,
a pair of regulating members arranged at a predetermined interval along the axial direction of the two rolls and movable in the axial direction while contacting the two rolls; and and a moving means for moving,
The first roll has a faster rotation speed than the second roll and has a smooth surface,
On the surface of the second roll, a first groove is formed on one end side of the second roll to feed the processed material toward one end of the second roll, and a groove is formed on the other end side of the second roll. a second groove for sending the processed material toward the other end of the second roll,
The moving means moves from a state in which all the grooves in the kneading region sandwiched by the pair of regulating members are the first grooves, to a state in which the pair of regulating members are spaced apart from each other by a predetermined interval, and the other roll is moved to the second roll. Moving in the same direction toward the end , moving the kneading area along the axial direction of the two rolls so that all the grooves in the kneading area are the second grooves. A two-roll type kneader. In the two-roll type kneader according to claim 1,
The moving means can adjust the distance between the pair of restricting members.
A two-roll kneader characterized by: In the two-roll type kneader according to claim 1 or claim 2,
The moving means can simultaneously move the pair of restricting members at the same speed.
A two-roll kneader characterized by: In the two-roll kneader according to any one of claims 1 to 3,
A scraper is provided for scraping off the processed material wound around the first roll by applying the tip to the first roll.
A two-roll kneader characterized by: