JP5736697B2 - Roll mill - Google Patents

Description

  The present invention relates to a roll mill for kneading and dispersing paste-like raw materials in which powder and a solvent are mixed in the production of ceramic electronic components.

A paste material, which is a material for ceramic electronic components, is formed by kneading and dispersing a paste-like raw material obtained by mixing powder and a solvent with a roll mill.
As a roll mill, for example, an apparatus disclosed in Patent Document 1 is known. In this roll mill, as shown in FIG. 3, the start roll 1 and the intermediate roll 2 are arranged in parallel with each other in close proximity to each other, and the intermediate roll 2 and the end roll 3 are arranged in close proximity to each other. Arranged in parallel, the intermediate roll 2 rotates clockwise, and the start roll 1 and end roll 3 rotate counterclockwise. The paste-like raw material 5 in which the powder and the solvent are mixed is put between the starting roll 1 and the intermediate roll 2 and is sheared and compressed when passing between the rolls 1 and 2 and between the rolls 2 and 3. A kneading and dispersing process is performed. The pasty raw material 5 formed by the kneading / dispersing process is transferred to the end point roll 3 and then collected by the scraping unit 4.

JP 2004-25075 A

By the way, in the roll mill shown in FIG. 3, since the start roll 1, the intermediate roll 2 and the end roll 3 are accommodated in a non-sealed casing 6 having an open top, the kneading / dispersion time becomes longer. The solvent is likely to evaporate into the atmosphere, and there is a risk of becoming a pasty raw material 5 having a high viscosity.
In addition, when the raw material 5 is kneaded and dispersed in an environment where the temperature is high, the high-temperature raw material 5 is likely to become a gel having a high viscosity because the chemical reaction is accelerated.
Therefore, the roll mill shown in FIG. 3 has an optimum paste-like viscosity when the raw material 5 is kneaded / dispersed for a long time or when the raw material 5 is kneaded / dispersed in a high-temperature environment. There is a problem that it is difficult to form a high-quality raw material 5.
Therefore, the present invention forms a high-quality raw material having optimum paste-like viscosity even when kneading / dispersing for a long time or when kneading / dispersing in a high-temperature environment. It aims to provide a roll mill that can be used.

In order to achieve the above object, the roll mill according to claim 1 of the present invention is a paste-like product in which a plurality of rolls are arranged adjacent to each other in an axial parallel, and a powder material and a solvent are mixed between a pair of adjacent rolls. In a roll mill in which raw materials are charged and kneaded / dispersed, a casing that accommodates the plurality of rolls and maintains the airtightness of the accommodating space so that the periphery of the roll is in a constant atmosphere, and the casing Substitution means for substituting the accommodation space in a vapor atmosphere of the solvent.
According to the present invention, since the storage space for storing the plurality of rolls and the raw material put into these rolls is replaced with the atmosphere of the solvent vapor, it is included in the raw material even if the kneading / dispersing process is performed for a long time. The solvent is not evaporated and the viscosity of the pasty raw material does not decrease.

Further, the invention according to claim 2 is the roll mill according to claim 1, wherein the replacement means supplies the solvent vapor to the accommodation space from the outside of the casing, so that the accommodation space is placed in a vapor atmosphere of the solvent. Is to be replaced.
According to a third aspect of the present invention, in the roll mill according to the second aspect, the replacement means includes an exhaust passage that communicates between the accommodating space and the outside air via an exhaust cutoff valve, and a steam cutoff valve. A supply passage that communicates between the housing space and the solvent vapor supply means disposed outside through the storage space, and opens the exhaust cutoff valve and the vapor cutoff valve to supply from the solvent vapor supply means When the vapor of the solvent is supplied to the storage space through the passage, and at the same time, the air existing in the storage space is discharged to the outside from the exhaust passage, and the storage space is replaced with the vapor atmosphere of the solvent Further, the exhaust cutoff valve and the steam cutoff valve are closed.

According to the present invention, the operation of replacing the storage space with the solvent vapor atmosphere is performed by supplying the solvent vapor supply means for supplying the solvent vapor to the sealed casing, the supply path connecting the solvent vapor supply means and the casing, and the storage It can be easily realized by an exhaust passage communicating between the space and the outside air, and an exhaust shut-off valve and a steam shut-off valve that simultaneously perform opening and closing operations.
Further, an invention according to claim 4, wherein, in the roll mill according to Izu Re of the claims 1 to 3, the ambient temperature of the accommodation space, to set the temperature to keep the paste viscosity of the raw material raw material It has heat insulation means.

Further, the invention according to claim 5 is the roll mill according to claim 4, wherein the raw material heat retaining means includes a temperature detection device that detects an atmospheric temperature of the accommodation space, and a temperature adjustment device that heats or cools the accommodation space. A control device that performs heating control or cooling control of the temperature adjusting device based on the detected temperature detected by the temperature detecting device so that the atmosphere temperature of the housing space becomes a temperature that maintains the pasty viscosity of the raw material. I have.
According to the present invention, the operation of keeping the raw material at a temperature at which the chemical reaction is not promoted and does not become a highly viscous gel can be easily realized by the temperature detection device, the temperature adjustment device, and the control device.
Furthermore, the invention according to claim 6 is the roll mill according to any one of claims 1 to 5, wherein the plurality of rolls are two rolls.

  According to the roll mill according to the present invention, the storage space for storing the plurality of rolls and the raw materials put in these rolls is replaced with the atmosphere of the solvent vapor. However, the solvent contained in the raw material does not evaporate, and the viscosity of the pasty raw material does not increase. Therefore, a high-quality raw material having an optimum paste-like viscosity can be formed.

It is the schematic which shows the roll mill of 1st Embodiment which concerns on this invention. It is the schematic which shows the roll mill of 2nd Embodiment which concerns on this invention. It is a schematic block diagram which shows the conventional roll mill.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 shows a roll mill according to a first embodiment in which a paste raw material mixed with powder and a solvent is kneaded and dispersed to form a paste material that is a material for a ceramic electronic component.
The roll mill of the present embodiment includes a first roll 10 and a second roll 11 that are arranged in parallel and close to the outer periphery of each other, and upper portions of the first and second rolls 10 and 11 in a direction along the roll axis. A pair of barrier plates 12 (one of the barrier plates 12 is shown in FIG. 1), a casing 13 housing the first and second rolls 10 and 11 and the barrier plate 12, and a casing 13 The exhaust pipe 15 that communicates the inside (hereinafter referred to as the “accommodating space 14”) and the outside air, the exhaust cutoff valve 16 that is interposed in the middle of the exhaust pipe 15, and the casing 13 that is accommodated at a position different from the exhaust pipe 15. A converging supply pipe 26 communicating with the space 14, a vapor supply pipe 18 connected to the solvent vapor supply unit 17 and the converging supply pipe 26, a steam cutoff valve 19 interposed in the middle of the steam supply pipe 18, and a purge gas supply Part 20 and yield A gas supply pipe 21 connected to the supply pipe 26, and a gas shut-off valve 22 is interposed in the middle conduit of the gas supply pipe 21.

The paste-like raw material 23 in which the powder and the solvent are mixed is introduced between the first roll 10 and the second roll 11 from between the pair of barrier plates 12.
The casing 13 includes a case 24 provided with an opening 24a in the upper part, and a cover 25 that is detachably attached to the upper part of the case 24 so as to close the opening 24a. The accommodating space 14 defined by 25 is kept airtight with the outside air, and is a sealed casing 13.

The solvent vapor supply unit 17 is a device that stores a solvent vapor having a predetermined vapor pressure. This solvent vapor is the same type as the solvent contained in the raw material 23, and the solvent in the pasty raw material 23 For example, when ethyl carbitol is used, the vapor of ethyl carbitol is stored in the solvent vapor supply unit 17.
The purge gas supply unit 20 is an apparatus that stores an inert gas such as nitrogen as a purge gas.
The exhaust passage of the present invention corresponds to the exhaust pipe 15, the solvent vapor supply means of the present invention corresponds to the solvent vapor supply unit 17, and the supply passage of the present invention corresponds to the vapor supply pipe 18 and the convergence supply pipe 26. ing.

Next, the procedure from the introduction of the raw material 23 using the roll mill of this embodiment to the completion of the kneading / dispersing process of the raw material 23 will be described. Note that the exhaust cutoff valve 16, the steam cutoff valve 19 and the gas cutoff valve 22 of the roll mill are kept closed in the initial state.
First, the cover 25 of the casing 13 is removed from the case 24, and a paste-like raw material 23 in which powder and solvent are mixed is introduced between the first roll 10 and the second roll 11 from between the pair of barrier plates 12. .
Next, a cover 25 is attached to the case 24 to form a sealed casing 13, and the raw material 23 put between the first roll 10 and the second roll 11 is accommodated in the accommodating space 14 that is kept airtight. To do.

Next, the exhaust cutoff valve 16 and the steam cutoff valve 19 are opened. When the exhaust shut-off valve 16 and the steam shut-off valve 19 are opened, solvent vapor having a predetermined vapor pressure is supplied from the solvent vapor supply unit 17 to the accommodation space 14 via the vapor supply pipe 18 and the convergence supply pipe 26 and accommodated. Air existing in the space 14 is discharged to the outside air through the exhaust pipe 15.
In this way, by keeping the exhaust shut-off valve 16 and the steam shut-off valve 19 in the open state for a predetermined time, the accommodation space 14 is replaced with an atmosphere of the same type of solvent vapor as the solvent contained in the raw material 23. . Then, when the storage space 14 is replaced with the solvent vapor atmosphere, the exhaust cutoff valve 16 and the steam cutoff valve 19 are closed.

Next, the raw material 23 is kneaded and dispersed by rotating the first roll 10 and the second roll 11 in opposite directions.
Then, when the kneading / dispersing process of the raw material 23 is completed, the exhaust cutoff valve 16 and the gas cutoff valve 22 are opened. When the exhaust cutoff valve 16 and the gas cutoff valve 22 are opened, the purge gas is supplied from the purge gas supply unit 20 to the storage space 14 via the gas supply unit 21 and the convergence supply pipe 26 and is present in the storage space 14. The solvent vapor is discharged to the outside air through the exhaust pipe 15.

In this way, the open space of the exhaust cutoff valve 16 and the gas cutoff valve 22 is maintained for a predetermined time, whereby the accommodation space 14 is replaced with an atmosphere of purge gas. Then, when the storage space 14 is replaced with the purge gas atmosphere, the exhaust cutoff valve 16 and the gas cutoff valve 22 are closed.
Next, the cover 25 of the casing 13 is removed from the case 24, and the raw material 23 that has undergone the kneading / dispersing process is recovered from the inside of the case 24.

Therefore, according to the present embodiment, when the raw material 23 is kneaded / dispersed, the accommodation space 14 is replaced with the solvent vapor atmosphere. The solvent contained in the solvent does not evaporate, and the viscosity of the paste-like raw material 23 does not decrease. Therefore, a high-quality raw material 23 having an optimum paste-like viscosity can be formed.
Further, in the present embodiment, the operation of replacing the storage space 14 with the atmosphere of the solvent vapor communicates the solvent vapor supply unit 17 that supplies the solvent vapor to the sealed casing 13 and the storage space 14 of the casing 13 and the outside air. This can be easily realized by the exhaust pipe 15 and the exhaust shut-off valve 16 and the steam shut-off valve 19 that simultaneously perform the opening / closing operation.

Next, FIG. 2 shows the roll mill of 2nd Embodiment. In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIG. 1, and description is abbreviate | omitted.
In the present embodiment, the temperature detection device 30 and the temperature adjustment device 31 are mounted on the inner wall of the cover 25, and the control device 32 is disposed outside the casing 13.
The temperature detection device 30 is a device that detects the ambient temperature of the accommodation space 14 at any time and outputs it to the control device 32.
The temperature adjustment device 31 is a heat source device that performs a heating operation to increase the atmospheric temperature of the accommodation space 14 or performs a cooling operation to decrease the atmospheric temperature of the accommodation space 14.

In addition, the control device 32 sets a predetermined control temperature T in advance, and based on the detection result of the temperature detection device 30, the heating operation or the cooling operation of the temperature adjustment device 31 so as to become the predetermined control temperature T. It is a device that controls.
Next, the procedure from the starting operation of the raw material 23 using the roll mill of this embodiment to the completion of the kneading / dispersing process will be described.
First, as in the first embodiment, the raw material 23 is charged between the first roll 10 and the second roll 11, and the atmosphere of the same type of solvent vapor as the solvent contained in the raw material 23 in the storage space 14. Perform the replacement work below.

Next, the control temperature T of the control device 32 is set to a temperature at which the chemical reaction of the raw material 23 is not promoted and does not become a gel with low viscosity.
Next, as in the first embodiment, the raw material 23 is kneaded and dispersed by rotating the first roll 10 and the second roll 11 in the opposite directions.
At this time, when the temperature detection device 30 detects that the ambient temperature of the storage space 14 exceeds the control temperature T, the control device 32 controls the cooling operation of the temperature adjustment device 31, and When the temperature detection device 30 detects that the ambient temperature is lower than the control temperature T, the control device 32 controls the temperature adjustment device 31 to perform a heating operation.

Then, similarly to the first embodiment, when the kneading / dispersing process of the raw material 23 is completed, the operation of replacing the storage space 14 with the purge gas atmosphere is performed.
Next, the cover 25 of the casing 13 is removed from the case 24, and the raw material 23 that has undergone the kneading / dispersing process is recovered from the inside of the case 24.
According to the present embodiment, when the raw material 23 is kneaded and dispersed, when the atmosphere temperature of the accommodation space 14 is high, the temperature adjusting device 31 performs the cooling operation, and the atmosphere temperature of the accommodation space 14 is low. Since the temperature control device 31 performs a heating operation, the raw material 23 is kept at a temperature at which the chemical reaction is not promoted and does not become a low-viscosity gel, and is kneaded and dispersed to obtain an optimum paste-like viscosity. It is possible to form a high-quality raw material 5 having

  Also, in this embodiment, the storage space 14 is replaced with an atmosphere of solvent vapor. However, since the atmospheric temperature of the storage space 14 is kept constant, the solvent vapor is reduced to the raw material 23 and the casing due to a decrease in the atmospheric temperature. Therefore, the high-quality raw material 5 having an optimum paste-like viscosity can be formed without causing the solvent of the raw material 23 to evaporate due to an increase in the atmospheric temperature.

Further, in the present embodiment, the temperature detecting device 30 and the temperature adjusting device 31 arranged in the casing 13 perform the operation of keeping the raw material 23 at a temperature at which the chemical reaction is not promoted and the viscosity is not high, and the temperature detecting device. This can be easily realized by the control device 32 that controls the temperature adjustment device 31 based on the detection result of the device 30.
In the first and second embodiments described above, the roll mill including the two rolls 10 and 11 has been described. However, the gist of the present invention is not limited to this, and for example, a start roll and an intermediate roll And even if it is three roll mills provided with the end point roll, the same effect can be produced.

  DESCRIPTION OF SYMBOLS 10 ... 1st roll, 11 ... 2nd roll, 12 ... Dam plate, 13 ... Casing, 14 ... Storage space, 15 ... Exhaust pipe, 16 ... Exhaust shut-off valve, 17 ... Solvent vapor supply part, 18 ... Steam supply pipe, DESCRIPTION OF SYMBOLS 19 ... Steam cutoff valve, 20 ... Purge gas supply part, 21 ... Gas supply pipe, 22 ... Gas cutoff valve, 23 ... Raw material, 24 ... Case, 24a ... Case opening, 25 ... Cover, 26 ... Convergence supply pipe, 30 ... Temperature detection device, 31 ... Temperature adjustment device, 32 ... Control device

Claims (6)

In a roll mill in which a plurality of rolls are arranged adjacent to each other in parallel to the axis, and a paste raw material mixed with a powder material and a solvent is added between a pair of adjacent rolls to perform kneading and dispersion treatment.
A casing that accommodates the plurality of rolls and holds the airtightness of the accommodation space so that the periphery of the rolls is in a constant atmosphere;
A roll mill comprising: replacement means for replacing the housing space in the casing with a vapor atmosphere of the solvent.   2. The roll mill according to claim 1, wherein the replacement unit supplies vapor of the solvent to the storage space from the outside of the casing to replace the storage space with a vapor atmosphere of the solvent. The replacement means includes an exhaust passage that communicates between the housing space and the outside air via an exhaust shutoff valve, and a solvent vapor supply means that is disposed outside the housing space and outside via a steam shutoff valve. A supply passage communicating with each other,
The exhaust shut-off valve and the steam shut-off valve are opened, the solvent vapor is supplied from the solvent vapor supply means to the housing space through the supply passage, and at the same time, the air existing in the housing space is externally supplied from the exhaust passage. while discharged, when the accommodating space is replaced under vapor atmosphere of the solvent, 請 Motomeko 2 roll mill according you, characterized in that said exhaust cutoff valve and the steam shut-off valve closed. The ambient temperature of the accommodating space, a roll mill according to Izu Re of claims 1 to 3, characterized in that it comprises a raw material heat insulating means for setting the temperature to keep the paste viscosity of the raw material.   The raw material heat retaining means includes a temperature detection device that detects an atmospheric temperature of the storage space, a temperature adjustment device that heats or cools the storage space, and an atmosphere of the storage space based on the detected temperature detected by the temperature detection device. The roll mill according to claim 4, further comprising: a control device that performs heating control or cooling control of the temperature adjusting device so that the temperature becomes a temperature that maintains a pasty viscosity of the raw material. The roll mill according to any one of claims 1 to 5, wherein the plurality of rolls are two rolls.

Images