JP6843390B2 - Coating device - Google Patents

Description

The present invention relates to a coating device.

Paint is one of the methods for applying a fluid material such as adhesive such as glue or paint (hereinafter referred to as "paint") to a plate-shaped or sheet-shaped object to be coated (single plate, steel strip, film, etc.). There is known a roll coating in which a film or the like formed on the outer peripheral surface of a coating roll is transferred to an object to be coated by supplying the above to the outer peripheral surface of the rotating coating roll. In roll coating, the physical properties such as the viscosity of the paint change due to changes over time and temperature, so the amount of paint etc. applied to the object to be coated (coating) even though the setting of the coating device has not been changed. Amount) may change. Therefore, various methods for measuring the coating amount have been devised.

Reflective film thickness meters and rangefinders that utilize the reflection of light or the like from the object to be measured are known. However, in these reflection type measurement methods, the measurement accuracy is lowered due to the vibration of the object to be measured, so that it is difficult to perform highly accurate in-line measurement of the film thickness of the paint or the like on the object to be coated or the coating roll. Therefore, the coating apparatus described in Patent Document 1 is not involved in coating by making the width of the coating roll larger than the width of the object to be coated in order to avoid the reflection type measurement method in which the measurement accuracy is lowered due to vibration. (Since it does not come into contact with the object to be coated, the film such as paint is not transferred to the object to be coated.) A roll edge portion is provided, and the outer peripheral surface of the roll of the roll edge portion and the outer peripheral surface of the coating roll in the area used for coating are scratched. A drop blade is provided, and the coating is applied based on the time until the amount of paint or the like scraped off at the roll edge reaches a predetermined amount and the time until the amount of paint or the like scraped off in the area used for coating reaches a predetermined amount. The amount is calculated.

Japanese Unexamined Patent Publication No. 63-190680

However, in the coating amount measuring method described in Patent Document 1, since the scraping blade and the coating roll come into contact with each other, the portion of the coating roll in which the blade contacts is worn, resulting in deterioration of coating quality such as variation in coating amount and poor coating. Can cause.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating apparatus capable of measuring the coating amount in-line with high accuracy without contact.

The coating apparatus according to the embodiment of the present invention includes a coating roll for applying the fluid material to the object to be coated by transferring a film of the fluid material formed on the outer peripheral surface thereof to the surface of the object to be coated. , Arranged axially around the outer peripheral surface of the coating roll, based on the detection results of the first sensor and the second sensor, which detect the distance to the fluid material on the outer peripheral surface, and the first sensor and the second sensor. A calculation means for calculating the coating amount of the fluid material applied to the object to be coated is provided, the width of the outer peripheral surface of the coating roll is wider than the width of the object to be coated, and the outer peripheral surface of the coating roll is the width thereof. The fluid material film formed above is divided into a transfer region that is transferred to the surface of the object to be coated and a non-transfer region that is not transferred, and the first sensor transfers the fluid material film in the transfer region. The second sensor is placed facing the non-transfer region and formed on the non-transfer region by detecting the distance to the fluid material remaining on the portion and facing the portion after the treatment. Detect the distance of the fluidized material to the film.

Further, in one embodiment of the present invention, the first sensor and the second sensor are arranged equidistant from the outer peripheral surface of the coating roll, and the calculation means is the difference between the measured value by the first sensor and the measured value by the second sensor. The coating amount is calculated based on.

Further, the coating apparatus according to the embodiment of the present invention applies a fluid material to the object to be coated by transferring a film of the fluid material formed on the outer peripheral surface thereof to the surface of the object to be coated. The roll and the first sensor and the second sensor which are arranged side by side in the axial direction around the outer peripheral surface of the coating roll and detect the film thickness of the fluid material on the outer peripheral surface, and the detection results of the first sensor and the second sensor. A calculation means for calculating the coating amount of the fluid material applied to the object to be coated is provided, the width of the outer peripheral surface of the coating roll is wider than the width of the object to be coated, and the outer peripheral surface of the coating roll is , The film of the fluid material formed on it is divided into a transfer region where it is transferred to the surface of the object to be coated and a non-transfer region where it is not transferred, and the first sensor is the film of the fluid material in the transfer region. Is placed facing the portion after the transfer, detects the film thickness of the fluid material remaining on the portion, and the second sensor is placed facing the non-transfer region and on the non-transfer region. Detects the film thickness of the fluid material formed in.

Further, in one embodiment of the present invention, the coating apparatus includes a supply means for supplying a fluid material to the outer peripheral surface of the coating roll.

Further, in one embodiment of the present invention, the first sensor and the second sensor move the fluid material by the supply means from the transfer position where the fluid material is transferred to the object to be coated in the rotation direction on the outer peripheral surface of the coating roll. Are placed facing each other in the area up to the supply position where is supplied.

Further, in one embodiment of the present invention, the coating apparatus further includes a coating amount adjusting means for adjusting the coating amount on the object to be coated, and the coating amount adjusting means determines the difference between the calculated value of the coating amount and the target value. Adjust the coating amount based on.

Further, in one embodiment of the present invention, the coating apparatus stops operation when the difference between the calculated value of the coating amount and the target value is equal to or greater than the threshold value.

Further, in one embodiment of the present invention, the coating device further includes an alarm means for outputting an alarm, and the alarm means outputs an alarm when the difference between the calculated value of the coating amount and the target value is equal to or more than a threshold value.

Further, in one embodiment of the present invention, two second sensors are arranged at two positions in the axial direction of the coating roll, and the calculation means calculates the coating amount for each of the detection results by each second sensor. ..

Further, in one embodiment of the present invention, a plurality of first sensors are arranged at intervals in the axial direction of the coating roll, and the calculation means calculates the coating amount with respect to the measured value by each second sensor.

Further, in one embodiment of the present invention, the coating amount adjusting means is arranged in parallel with the coating roll, and is a doctor roll facing the region from the supply position to the transfer position in the rotation direction on the outer peripheral surface of the coating roll. , The roll distance adjusting means for adjusting the distance between the axes of the coating roll and the doctor roll, and the coating amount adjusting means controls the roll distance adjusting means based on the difference between the calculated value of the coating amount and the target value. Then, the coating amount is adjusted by adjusting the distance between the axes of the doctor roll and the coating roll.

Further, in one embodiment of the present invention, two roll distance adjusting means are arranged at both ends in the axial direction of the coating roll, and the coating amount adjusting means is based on the difference between the calculated values of the plurality of applied coating amounts. Each roll distance adjusting means is controlled.

According to one embodiment of the present invention, there is provided a coating apparatus capable of measuring the coating amount in-line with high accuracy without contact.

It is a perspective view which shows the outline of the main part of the coating apparatus which concerns on embodiment of this invention. It is a top view which shows the outline of the roll unit in the coating apparatus which concerns on embodiment of this invention. It is a side view which shows the outline of the main part of the coating apparatus which concerns on embodiment of this invention. It is a figure which shows the arrangement of the sensor in the coating apparatus which concerns on embodiment of this invention. It is a block diagram of the control system of the coating apparatus which concerns on embodiment of this invention. It is a graph which shows the relationship between the viscosity of glue and the coating amount in the coating apparatus which concerns on embodiment of this invention. It is an enlarged sectional view around the outer peripheral surface of a coating roll. It is a flowchart of control of the coating apparatus which concerns on embodiment of this invention. It is a top view which shows the outline of the modification of the roll unit in the coating apparatus which concerns on embodiment of this invention. It is a flowchart of control of the coating apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a main part of the coating device 1. FIG. 2 is a top view showing a schematic configuration of the roll unit 10 in the coating device 1. FIG. 3 is a side view showing a schematic configuration of a main part of the coating device 1. FIG. 4 is a schematic view showing the arrangement of the coating rolls of the coating apparatus 1 in the axial direction of the sensors (141a, 141b, 142a, 142b) used for measuring the coating amount. FIG. 5 is a block diagram of the control system of the coating device 1. The coating device 1 of the present embodiment applies glue to both surfaces of a single plate P used for manufacturing plywood.

In the following description, the left-right direction in FIG. 3 is the X-axis direction, the direction perpendicular to the paper surface is the Y-axis direction, and the up-down direction is the Z-axis direction. The Z-axis direction is the vertical direction, and the X and Y-axis directions are the horizontal direction. Further, in the following description, the front side in FIG. 3 is referred to as the left and the back side is referred to as the right.

The coating device 1 includes a roll unit 10 for applying glue to the single plate P, a glue supply unit 11 for supplying glue to the roll unit 10, a transport unit 12 (FIG. 5) for transporting the single plate P, and a coating roll. A sensor unit 13 (FIG. 5) for measuring the amount of glue, an alarm output unit 15 (FIG. 5) that outputs an alarm when an abnormality occurs in the operating state of the coating device 1, and each of the coating device 1. It includes a control unit 14 (FIG. 5) that controls the unit and the alarm output unit 15.

As shown in FIG. 1-3, the roll unit 10 has a rotation axis oriented in the Y-axis direction with respect to a pair of coating rolls 101a and 101b arranged one above the other and coating rolls 101a and 101b, respectively. The doctor rolls 102a and 102b arranged so as to be aligned in the X-axis direction, the roll support portion 103 that supports each roll, the distance between the axes of the coating roll 101a and the doctor roll 102a, and the coating roll 101b and the doctor roll 102b. It includes a roll distance adjusting unit 104 for adjusting the distance between the shafts, and four drive units 105 for rotationally driving each roll.

The coating rolls 101a and 101b are iron rolls covered with rubber, and the doctor rolls 102a and 102b are iron rolls. The coating rolls 101a and 101b are members for applying the glue held on the outer peripheral surface thereof to the single plate P. Further, the doctor rolls 102a and 102b are members for forming a uniform film by leveling the glue adhering to the coating rolls 101a and 101b. The roll unit 10 is set so that the width that can be used for coating, that is, the length that the coating rolls 101a and 101b and the doctor rolls 102a and 102b face each other in the Y-axis direction is longer than the width of the single plate P (dimension in the Y-axis direction). Has been done.

The roll support portion 103 supports each roll so that the doctor rolls 102a and 102b can be moved in the X-axis direction to change the distance between the coating rolls 101a and 101b and the doctor rolls 102a and 102b.

The roll distance adjusting unit 104 includes a roll distance adjusting mechanism 104La for adjusting the position of the left end of the doctor roll 102a in the X-axis direction and a roll distance adjusting mechanism for adjusting the position of the right end of the doctor roll 102a in the X-axis direction. It includes 104Ra, a roll distance adjusting mechanism 104Lb for adjusting the X-axis direction position of the left end portion of the doctor roll 102b, and a roll distance adjusting mechanism 104Rb for adjusting the X-axis direction position of the right end portion of the doctor roll 102b. By adjusting the position of each doctor roll in the X-axis direction using the roll distance adjusting unit 104, the distance between the coating rolls 101a and 101b and the doctor rolls 102a and 102b can be adjusted.

The drive unit 105 is, for example, an inverter motor, and as shown in FIG. 3, the coating roll 101a and the doctor roll 102a are rotated in opposite directions so that the facing surfaces of the coating roll 101a and the doctor roll 102a move downward. The coating roll 101b and the doctor roll 102b are rotationally driven in opposite directions so that the facing surfaces of the coating roll 101b and the doctor roll 102b move upward.

As shown in FIG. 1, the glue supply unit 11 includes a service tank 110, a glue circulation pump 111, a supply path 112, and a glue receiver 113. The service tank 110 is a container for storing glue for supplying to the roll unit 10. Glue is supplied to the service tank 110 by a glue mixing device (or an operator) (not shown). The glue circulation pump 111 sends the glue in the service tank 110 between the coating roll 101a and the doctor roll 102a through the supply path 112. The glue receiver 113 is configured to receive and store the glue flowing down from the left and right between the coating roll 101a and the doctor roll 102a. The glue receiver 113 is configured to store a predetermined amount of glue and allow the amount of glue exceeding the predetermined amount to flow into the service tank 110. In a state where a predetermined amount of glue is accumulated in the glue receiver 113, the lower portion of the coating roll 101b is immersed in the glue accumulated in the glue receiver 113, whereby the glue is supplied to the coating roll 101b.

The single plate transport unit 12 transports the single plate P in the X-axis direction and supplies the single plate P between the coating roll 101a and the coating roll 101b.

With the above configuration, glue can be applied to both sides of the single plate P. The operation of the coating device 1 when applying the glue to the single plate P will be described below. When glue is supplied to the service tank 110 and the glue circulation pump 111 is driven, the glue supplied to the service tank 110 is supplied between the coating roll 101a and the doctor roll 102a through the supply path 112. The glue supplied between the coating roll 101a and the doctor roll 102a passes between the coating roll 101a and the doctor roll 102a as the coating roll 101a and the doctor roll 102a rotate, and reaches the outer peripheral surface of the coating roll 101a. A glue film is formed. The film thickness of the glue film formed on the coating roll 101a is determined by the distance between the axes of the coating roll 101a and the doctor roll 102a if the viscosity of the glue and the rotation speed of each roll are constant. Therefore, the film thickness of the glue film formed on the coating roll 101a can be adjusted by the roll distance adjusting mechanisms 104La and 104Ra.

Of the glue supplied between the coating roll 101a and the doctor roll 102a, the glue that has flowed down from both the left and right ends without passing between the coating roll 101a and the doctor roll 102a is collected in the glue receiver 113. When the glue accumulates in the glue receiver 113 to the depth where the lower part of the coating roll 101b is immersed, the glue adheres to the rotating coating roll 101b and is lifted, and as the coating roll 101b and the doctor roll 102b rotate, the coating roll 101b and the doctor roll It passes between 102b and a glue film is formed on the coating roll 101b. The film thickness of the glue film formed on the coating roll 101b can be adjusted by the roll distance adjusting mechanisms 104Lb and 104Rb in the same manner as the film thickness of the glue film formed on the coating roll 101a. The amount of glue applied to the single plate P increases or decreases as the film thickness of the glue formed on the coating rolls 101a and 101b increases or decreases. That is, the doctor rolls 102a and 102b, the roll distance adjusting unit 104, and the control unit 14 that controls the roll distance adjusting unit 104 cooperate to adjust the coating amount to adjust the amount of glue supplied to the coating rolls 101a and 101b. Serve as a means.

The glue film formed on the coating roll 101a and the glue film formed on the coating roll 101b are transferred to the upper surface and the lower surface of the single plate P passing between the coating rolls 101a and 101b, respectively. Will be done. A part of the glue film formed on the coating rolls 101a and 101b is applied to the single plate P, and the glue remaining on the coating rolls 101a and 101b forms a thin film of glue on the outer peripheral surfaces of the coating rolls 101a and 101b. .. Therefore, the amount of glue applied to the single plate P is determined by the glue film formed on the coating rolls 101a and 101b before coating and the glue film formed by the glue remaining on the coating rolls 101a and 101b after coating. It can be obtained from the difference in film thickness with.

FIG. 6 shows the relationship between the viscosity of the glue and the coating amount when the distance between the axes of the coating roll and the doctor roll is constant. As shown in FIG. 6, when the distance between the axes of the coating roll and the doctor roll is constant, the coating amount increases as the viscosity of the glue increases. If the distance between the axes of the coating rolls 101a and 101b and the doctor rolls 102a and 102b and other settings of the coating device are constant and the viscosity of the glue is also constant, the amount of glue applied to the single plate P does not change. , The viscosity of the glue changes from moment to moment due to temperature changes and changes over time (progress of curing, etc.). When the viscosity of the glue changes, the amount of glue applied to the single plate P changes as shown in FIG. 6, even if the distance between the axes of the coating rolls 101a and 101b and the doctor rolls 102a and 102b is not changed. .. Therefore, the coating device 1 of the present embodiment includes a sensor unit 13 for measuring the amount of glue applied to the single plate P.

The sensor unit 13 includes sensors 131a and 132a arranged to face the outer peripheral surface of the coating roll 101a and sensors 131b and 132b arranged to face the outer peripheral surface of the coating roll 101b. The sensors 131a, 132a, 131b, 132b in the coating device 1 of the present embodiment are distance sensors that detect the distance between the object to be measured and the sensor.

As shown in FIG. 3, the sensor 131a is a coating roll from a position on the coating roll 101a facing the coating roll 101b in the rotation direction, that is, a transfer position where the glue adhering to the coating roll 101a is transferred to the single plate P. It is arranged in the region Ca between the 101a and the doctor roll 102a up to the position where the glue is accumulated, that is, the supply position where the glue is supplied to the coating roll 101a. Further, as described above, since the width that can be used for coating is set to be longer than the width of the single plate P in the roll unit 10, as shown in FIG. 4, the outer peripheral surface of the coating roll 101a is in the axial direction. In the non-transfer areas Aa and A'a where the glue film on the coating roll 101a is not transferred to the single plate P because it does not come into contact with the single plate P, and the glue film on the coating roll 101a comes into contact with the single plate P. There is a transfer region Ba that is transferred to the single plate P. The sensor 131a is arranged in the axial direction of the coating roll 101a so as to face the non-transfer region Aa near the right end of the outer peripheral surface of the coating roll 101a.

Similar to the sensor 131a, the sensor 131b also collects in the glue receiver 113 from a position facing the coating roll 101a in the rotation direction of the coating roll 101b, that is, a transfer position where the glue adhering to the coating roll 101b is transferred to the single plate P. It is arranged in the region Cb up to the position where the glue comes into contact with the glue, that is, the supply position where the glue is supplied to the coating roll 101a. Further, similarly to the coating roll 101a, the non-transfer regions Ab and A on the outer peripheral surface of the coating roll 101b do not come into contact with the single plate P in the axial direction, so that the glue film on the coating roll 101b is not transferred to the single plate P. There is a transfer region Bb in which the glue film on the coating roll 101b is transferred to the single plate P in contact with the single plate P. Similar to the sensor 131a, the sensor 131b is arranged in the axial direction of the coating roll 101b so as to face the non-transfer region Ab near the right end of the coating roll 101b.

As shown in FIG. 3, the sensor 131a and the sensor 132a are arranged side by side in the Y-axis direction. That is, as shown in FIG. 3, the sensor 131a and the sensor 132a are arranged in the same phase around the coating roll 101a. Further, as shown in FIG. 4, the sensor 132a is arranged in the transfer region Ba in the axial direction of the coating roll 101a. The sensor 131a and the sensor 132a are arranged at the same distance from the coating roll 101a.

The sensor 131b and the sensor 132b are also arranged side by side in the Y-axis direction in the same manner as the positional relationship between the sensor 131a and the sensor 132a. That is, as shown in FIG. 3, the sensor 131b and the sensor 132b are arranged in the same phase around the coating roll 101b. Further, as shown in FIG. 4, the sensor 132b is arranged in the transfer region Bb in the axial direction of the coating roll 101b. The sensor 131b and the sensor 132b are arranged at the same distance from the coating roll 101b.

The sensors 131a and 132a measure the distance to the outer peripheral surface of the coating roll 101a (the surface of the glue when the glue film is formed). Since the film thickness of the glue film formed on the coating roll 101a at the time before coating is uniform in the axial direction of the coating roll 101a, the distance measurement by the sensor 131a performed in the non-transfer region Aa is performed by coating. It can be regarded as a distance measurement to the surface of the glue film formed on the coating roll 101a at the previous time point.

Similar to the sensors 131a and 132a, the 131b and 132b also measure the distance to the outer peripheral surface of the coating roll 101b. Since the film thickness of the glue film formed on the coating roll 101b before coating is uniform in the axial direction of the coating roll 101b, the distance measurement by the sensor 131b performed in the non-transfer region Ab is performed by coating. It can be regarded as a distance measurement to the surface of the glue film formed on the coating roll 101b at the previous time point.

In the present embodiment, since the distance from the sensor 131a (131b) to the coating roll 101a (101b) is equal to the distance from the sensor 132a (132b) to the coating roll 101a (101b), the distance measurement values by the sensors 131a and 131b The difference between the distance measurement values obtained by the sensors 132a and 132b is the film of the glue formed on the coating rolls 101a and 101b before coating and the glue film remaining on the coating rolls 101a and 101b after coating. It becomes a thickness difference.

Even if the distance from the sensor 131a (131b) to the coating roll 101a (101b) is different from the distance from the sensor 132a (132b) to the coating roll 101a (101b), the difference in distance can be taken into consideration in the calculation. The film thickness difference can be calculated. For example, when the distance from the sensor 131a (131b) to the coating roll 101a (101b) is shorter than the distance from the sensor 132a (132b) to the coating roll 101a (101b) by the difference g, the distance is measured by the sensor 131a (131b). The film thickness difference can be calculated by adding the difference g to the value and then taking the difference from the distance measurement value by the sensor 132a (132b). The distance difference g may be stored in a control unit or the like in advance, or may be measured by providing a calibration step before the start of coating.

A plurality of spiral grooves t are formed at equal intervals on the outer peripheral surface (rubber surface) of the coating rolls 101a (101b). FIG. 7 shows an enlarged cross-sectional view of the vicinity of the outer peripheral surface of the coating roll 101a (101b). The glue film formed on the outer peripheral surface of the coating roll 101a (101b) also has a dent along the groove t. Therefore, when one of the sensors 131a (131b) and the sensor 132a (132b) is measuring the portion of the groove t and the other is measuring the portion other than the groove t, only the measurement result of one sensor is caused by the groove t. Since it is affected by the change in distance due to the dent of the film, an error occurs by the change in distance due to the groove t when calculating the film thickness difference between the non-transfer region Aa (Aa) and the transfer region Ba (Bb). It ends up. Therefore, as shown in FIG. 7, the sensor 131a (131b) and the sensor 132a (132b) have a coating roll 101a (so that when one faces the position of the groove t, the other faces the position of the groove t). It is necessary to adjust the arrangement interval between the sensor 131a (131b) and the sensor 132a (132b) in the axial direction of 101b) to an integral multiple of the interval of the groove t.

Further, if the measurement spot of each sensor always straddles the portion where the groove t is formed and the portion where the groove t is not formed, it may be the distance to the portion of the groove t or the portion not the groove t. Only the distance measurement result, which is not clear whether it is the distance, can be obtained. Therefore, it is preferable to select a sensor whose measurement spot diameter is sufficiently smaller than the width of the concave portion or the convex portion of the groove t so that the distance measurement result can be clearly obtained.

Since the groove t is formed in a spiral shape, the position of the groove t on the cross section of FIG. 7 (the plane through which the light rays of the sensor 131a (131b) and the sensor 132a (132b) pass) is the coating roll 101a (101b). The coating roll 101a (101b) moves in the axial direction with the rotation of the coating roll 101a (101b). However, the grooves t on the cross section shown in FIG. 7 move in the axial direction of the coating rolls 101a (101b) while maintaining the intervals. Therefore, if the measurement by the sensor 131a (131b) and the measurement by the sensor 132a (132b) are performed in synchronization, if the measurement by one of the sensor 131a (131b) and the sensor 132a (132b) is performed at the position of the groove t, the other The measurement by the other is also performed at the position of the groove t, and when the measurement by one is performed at the position other than the groove t, the measurement by the other is also performed at the position other than the groove t. As a result, it becomes possible to accurately calculate the film thickness difference between the non-transfer region Aa (Ab) and the transfer region Ba (Bb) without being affected by the dent of the film caused by the groove t.

As described above, the amount of glue applied to the single plate P was formed by the glue film formed on the coating rolls 101a and 101b before the coating and the glue remaining on the coating rolls 101a and 101b after the coating. It can be obtained from the difference in film thickness from the glue film. That is, the coating amount can be obtained from the difference between the measured values by the sensors 131a and 131b and the measured values by the sensors 132a and 132b.

Assuming that the value measured by the sensor 131a (131b) is d ₁ , the value measured by the sensor 132a is d ₂ , the density of the glue is ρ, and the correction coefficient is α, the per unit area of the glue on the upper surface (lower surface) of the single plate P. The calculated value Mc of the coating amount can be obtained by the following equation (1).
(Equation 1)
Mc = (d _2- d ₁ ) × ρ × α

In the present embodiment, the target value Mt of the coating amount is set as the mass of the glue adhering to the surface of the single plate P per unit area. For example, the target value Mt of the coating amount is per single plate P. When it is set as the mass of the glue to be applied to, the measurement is performed only once for the application of one single plate P, and the calculated value Mc of the coating amount is obtained based on the result, and the calculated value Mc is used. The area of the single plate P may be multiplied.

The correction coefficient α is set according to the coating conditions such as the temperature affecting the density ρ of the glue, the rotation speed of the coating rolls 101a and 101b, and the transport speed of the single plate P.

The distance measurement by the sensors 131a and 131b and the distance measurement by the sensors 132a and 132b are preferably performed synchronously for the following two reasons.

The first reason is that vibration during operation of the coating rolls 101a and 101b (displacement in the direction orthogonal to the axis of the coating rolls 101a and 101b) is unavoidable. The distance to the surface of the film) changes depending on the vibration state, and different measured values may appear due to the difference in measurement timing. In the coating device 1, the sensors 131a and 131b and the sensors 132a and 132b are arranged at the same positions in the rotation direction of the coating rolls 101a and 101b, so that the measurement error of each sensor due to such vibration is the sensor 131a. , 131b and the sensors 132a, 132b can be canceled by performing the measurement in the same vibration state, that is, in synchronization. Specifically, when the displacement in the direction orthogonal to the axes of the coating rolls 101a and 101b at a certain timing and in the distance direction from each sensor is e, the measured values by the sensors 131a and 131b are also the measured values by the sensors 132a and 132b. Will also include the measurement error e. When calculating the calculated value Mc, the difference between the measured values by the sensors 131a and 131b and the measured values by the sensors 132a and 132b is taken, so that the error e included in both measured values is canceled and the calculated calculated value Mc is affected. Will not.

The second reason is that the film thickness of the glue film formed on the coating rolls 101a and 101b in the rotation direction is not always constant. When the film thickness of the glue film formed on the coating rolls 101a and 101b in the rotation direction is not constant, the distance measurement by the sensors 131a and 131b and the distance measurement by the sensors 132a and 132b are performed at different timings, that is, they are different in the rotation direction. When the distance at the position is measured, if the film thickness of the glue film formed on the coating rolls 101a and 101b in the rotation direction is not constant, the measured value is inappropriate as a comparison target.

Next, the control method of the coating device 1 will be described. As shown in FIG. 5, the control unit 14 is connected to the roll unit 10, the glue supply unit 11, the transport unit 12, the sensor unit 13, and the alarm output unit 15. The control unit 14 drives the glue circulation pump 111 of the glue supply unit 11 to supply glue between the coating rolls 101a and the doctor roll 102a, and drives the driving unit 105 of the roll unit 10 to drive the coating rolls 101a and 101b. And the doctor rolls 102a and 102b are rotated to drive the single plate transport unit 12 to pass the single plate P between the coating roll 101a and the coating roll 101b. Further, the control unit 14 acquires a measured value of the distance from the sensor unit 13 and calculates the coating amount while controlling each unit as described above to apply the glue to the single plate P.

FIG. 8 is a flowchart of control of the coating device 1. As shown in FIG. 8, the control unit 14 starts each unit of the coating device 1 to start the operation (S101). Next, the sensor unit 13 is controlled to acquire a measured value of the distance from each sensor (S102), and the calculated value Mc of the coating amount is obtained from the acquired measured value using the above (Equation 1) (S103). That is, the control unit 14 plays the role of a calculation means. The calculated value Mc obtained by the control unit 14 can be used for various controls of the coating device 1 by the control unit 14. FIG. 8 shows an example of control of the coating apparatus 1 using the calculated value Mc.

In the example shown in FIG. 8, the target value Mt of the coating amount is set in advance, and the control unit 14 allows the difference Md (absolute value) between the calculated value Mc and the target value Mt to be an allowable error of the coating amount. It is confirmed whether or not the error is larger than m (S104). The margin of error m is determined based on the accuracy of the required coating amount.

When the difference Md is equal to or less than the permissible error m (S104: NO), the control unit 14 confirms whether or not there is an operation end instruction (whether or not the operation stop operation has been performed) (S106). If the operation end instruction is issued (S106: YES), each unit is stopped to stop the operation (S107), and the control of the coating device 1 is terminated. If the operation end instruction is not issued (S106: NO), the processes from S101 to S105 are repeated.

When the difference Md is larger than the permissible error m (S104: YES), the control unit 14 controls the alarm output unit 105 to output an alarm (S105), and the process proceeds to S106. In addition to the output of the alarm, it may be possible to display whether the calculated value Mc is larger or smaller than the target value Mt.

By outputting an alarm and displaying whether the calculated value Mc is larger or smaller than the target value Mt, the operator recognizes that the film thickness is out of the permissible range due to the alarm, and rolls with reference to the display. The coating amount can be adjusted by manually operating the distance adjusting unit 104 or the like. In addition, the operator can stop the operation of the coating device 1 as needed.

Since the viscosity of the glue generally increases with time, the viscosity of the glue increases while the coating is continued, and the coating amount increases as shown in FIG. However, as in the example shown in FIG. 8, when the increase or decrease width of the coating amount becomes the permissible error m or more, an alarm is output to prompt the operator to adjust the coating amount, so that the coating amount increases. In that case, it is possible to prevent the glue from being consumed wastefully, which leads to cost reduction. In S105, the operation of the coating device 1 may be stopped in combination with the alarm output or in place of the alarm output. By stopping the operation, it is possible to reliably prevent the occurrence of defective coating products.

There is a certain correlation between the coating amount and the distance between the coating rolls 101a (101b) and the doctor roll 102a (102b). Specifically, as the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b) increases, the coating amount increases. Therefore, when the coating amount is increased, the roll distance adjusting unit 104 is controlled so as to increase the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b). Further, when reducing the coating amount, the roll distance adjusting unit 104 may be controlled so as to narrow the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b).

In the coating device 1 of the present invention, coating is performed in a state where the doctor roll 102a (102b) is pressed against the coating roll 101a (101b). Therefore, the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b) and the force acting between the coating roll 101a (101b) and the doctor roll 102a (102b), that is, the roll distance adjusting mechanism 104La, There is a certain correlation with the load applied to each of 104Ra (104Lb, 104Rb). Specifically, as the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b) becomes narrower, the load applied to each of the roll distance adjusting mechanisms 104La and 104Ra (104Lb, 104Rb) increases.

Therefore, for example, as shown in FIG. 9, a strain gauge that detects the force acting between the coating roll 101a (101b) and the doctor roll 102a (102b) on each of the roll distance adjusting mechanisms 104La, 104Ra, 104Lb, and 104Rb. When the load detecting means 106La, 106Ra, 106Lb, 106Rb is provided and the coating amount is increased, the load detected by the load detecting means 106La, 106Ra, 106Lb, 106Rb is reduced (that is, the distance between the axes is widened). When controlling the roll distance adjusting unit 104 and reducing the coating amount, the roll distance is increased so that the load detected by the load detecting means 106La, 106Ra, 106Lb, 106Rb is increased (that is, the distance between the axes is narrowed). The adjustment unit 104 may be controlled.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, only the control flow of the coating device 1 is different from the first embodiment. FIG. 10 shows a flowchart of control of the coating apparatus according to the second embodiment. In the second embodiment, since the processing of S204-S207 is different from that of the first embodiment, the processing after S204 will be described. After calculating the coating amount in S203, the control unit 14 confirms whether or not the calculated value Mc is equal to the target value Mt (S204). When the calculated value Mc is equal to the target value Mt (S204: YES), the control unit 14 confirms the presence / absence of the operation end instruction (S208). If the operation end instruction is issued (S208: YES), the control unit 14 stops each unit to stop the operation (S209), and if the operation end instruction is not issued (S208: NO), S202. To S207 are repeated.

When the calculated value Mc is different from the target value Mt (S204: NO), the control unit 14 confirms whether or not the calculated value Mc is larger than the target value Mt (S205). When the calculated value Mc is larger than the target value Mt (S204: YES), the control unit 14 controls the roll distance adjusting unit 104 to narrow the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b). , The coating amount is reduced by reducing the film thickness of the glue formed on the coating rolls 101a (101b) (S206). When the calculated value Mc is less than the target value Mt (S205: NO), the control unit 14 controls the roll distance adjusting unit 104 to increase the distance between the axes of the coating roll 101a (101b) and the doctor roll 102a (102b). The coating amount is increased by increasing the film thickness of the glue formed on the coating rolls 101a (101b) (S207), and the treatment proceeds to S208.

By controlling the coating device 1 so that the coating amount automatically approaches the target value Mt when the calculated value Mc of the coating amount changes, the coating amount close to the target value Mt is maintained without the intervention of an operator. The coating device 1 can be continued to operate. In the second embodiment as well, the permissible error m is set as in the first embodiment, and an alarm is output when the difference Md (absolute value) between the calculated value Mc and the target value Mt exceeds the permissible error m. And / or may be configured to stop the operation of the coating device 1. With this configuration, for example, when some abnormality that the coating amount cannot be controlled by automatic control occurs, it is possible to confirm the abnormality of the coating device 1 and prevent the occurrence of defective coating products. ..

The above is the description of an example of the embodiment of the present invention. The embodiments of the present invention are not limited to those described above, and various modifications can be made within the scope of the technical idea expressed by the description of the claims. For example, the embodiment of the present application also includes a content obtained by appropriately combining an embodiment or the like or a self-explanatory embodiment or the like exemplified in the specification.

[Modification example]
In the above embodiment, the sensors 132a and 132b are provided in the non-transfer regions Aa and Ab in FIG. 4, respectively, but the sensors 132a in the non-transfer regions A'a and A'b in FIG. 4 are also provided. A configuration in which 132b is provided may be used. When the calculated values Mc obtained from the measured values by the sensors 132a and 132b provided in the non-transferred regions Aa and Ab and the non-transferred regions A'a and A'b show different values, the axes of the coating rolls 101a and 101b It is considered that the film thickness of the glue on the coating rolls 101a and 101b is not uniform in the direction. Since the distance between the axes of the coating rolls 101a and 101b and the doctor rolls 102a and 102b can be adjusted independently by the roll distance adjusting mechanisms 104La and 104Lb and the roll distance adjusting mechanisms 104Ra and 104Rb, the non-transfer region Aa , Ab and the calculated values Mc obtained from the measured values by the sensors 132a and 132b provided in the non-transfer regions Aa and A'b', respectively, so that the film thickness of the glue on the coating rolls 101a and 101b becomes uniform. The roll distance adjusting mechanisms 104La and 104Lb and the roll distance adjusting mechanisms 104Ra and 104Rb can be controlled independently.

In the above embodiment, one sensor 131a and one 131b are provided in the transfer regions Ba and Bb in FIG. 4, but a plurality of sensors 131a and 131b are provided in the transfer regions Ba and Bb in FIG. Is also good. When a plurality of sensors 131a and 131b are provided, the coating amount at a plurality of points in the Y-axis direction can be obtained, so that variations in the coating amount in the Y-axis direction can be detected. Therefore, for example, even if a coating defect partially occurs in the Y-axis direction, the coating defect can be detected.

The coating device 1 in the above embodiment is a device for applying glue to both surfaces of the single plate P, but the configuration of the coating device, the coating target, the paint, and the like are not limited to those described above. The coating device is a device that transfers the paint or the like attached to the coating roll to the coating target, and provides a region that is not used for coating or a region that is not used for coating in the longitudinal direction of the coating roll. If it is possible, the calculated value Mc can be obtained by providing the sensor at an appropriate position. Therefore, the film thickness of the paint or the like formed on the coating roll may be adjusted by using a doctor blade instead of the doctor roll 102. In addition to single plates, plates, bands, and sheets made of various materials can be applied. Further, the device may be a device that applies only to one side of the application target. Further, as the paint and the like, various fluid materials such as a paint and a coating agent can be considered in addition to the glue.

The coating device 1 in the above embodiment employs a distance sensor for the sensors 131a, 131b, 132a, 132b, but the difference in the film thickness of the glue between the non-transfer regions Aa and Ab and the transfer regions Ba and Bb. It does not have to be a distance sensor as long as it can be calculated. As a sensor that replaces the distance sensor, for example, a film thickness sensor can be considered. When the film thickness sensor is adopted, unlike the case where the distance sensor is used, the distance to the coating roll differs between the sensor arranged in the non-transfer areas Aa and Ab and the sensor arranged in the transfer areas Ba and Bb. Even if it is, the calculated value Mc can be simply obtained from the difference between the measured values. The distance sensor is not only cheaper than the film thickness sensor, but also has an advantage that it does not require physical properties such as paint for measurement. Therefore, it is possible to obtain the measured value of the coating amount without changing the setting for various paints having different physical properties.

1 ... Coating device 10 ... Roll units 101a, 101b ... Coating rolls 102a, 102b ... Doctor roll 103 ... Roll support 104 ... Roll distance adjusting units 104La, 104Ra, 104Lb, 104Rb ... Roll distance adjusting mechanism 105 ... Drive units 106La, 106Ra , 106Lb, 106Rb ... Load detecting means 11 ... Glue supply unit 110 ... Service tank 111 ... Glue circulation pump 112 ... Supply path 113 ... Glue receiver 12 ... Single plate transport unit 13 ... Sensor units 131a, 131b, 132a, 132b ... Sensor 14 … Control unit 15… Alarm output unit

Claims (12)

A coating roll for applying the fluid material to the object to be coated by transferring a film of the fluid material formed on the outer peripheral surface to the surface of the object to be coated.
The first sensor and the second sensor, which are arranged in an axial direction around the outer peripheral surface of the coating roll and detect the distance to the fluid material on the outer peripheral surface,
A calculation means for calculating the coating amount of the fluid material applied to the object to be coated based on the detection results of the first sensor and the second sensor.
With
The width of the outer peripheral surface of the coating roll is wider than the width of the object to be coated.
The outer peripheral surface of the coating roll is divided into a transfer region in which the film of the fluid material formed on the coating roll is transferred to the surface of the object to be coated and a non-transfer region in which the film is not transferred.
The first sensor is arranged in the transfer region so as to face the portion of the transfer region after the film of the fluid material has been transferred, and detects the distance to the fluid material remaining on the portion.
The second sensor is arranged to face the non-transfer region and detects the distance to the film of the fluid material formed on the non-transfer region.
Coating device. The first sensor and the second sensor are arranged equidistantly from the outer peripheral surface of the coating roll.
The calculation means calculates the coating amount based on the difference between the value measured by the first sensor and the value measured by the second sensor.
The coating device according to claim 1. A coating roll for applying the fluid material to the object to be coated by transferring a film of the fluid material formed on the outer peripheral surface to the surface of the object to be coated.
A first sensor and a second sensor, which are arranged in an axial direction around the outer peripheral surface of the coating roll and detect the film thickness of the fluid material on the outer peripheral surface,
A calculation means for calculating the coating amount of the fluid material applied to the object to be coated based on the detection results of the first sensor and the second sensor.
With
The width of the outer peripheral surface of the coating roll is wider than the width of the object to be coated.
The outer peripheral surface of the coating roll is divided into a transfer region in which the film of the fluid material formed on the coating roll is transferred to the surface of the object to be coated and a non-transfer region in which the film is not transferred.
The first sensor is arranged in the transfer region so as to face the portion of the transfer region after the film of the fluid material has been transferred, and detects the film thickness of the fluid material remaining on the portion.
The second sensor is arranged to face the non-transfer region and detects the film thickness of the fluid material formed on the non-transfer region.
Coating device. A supply means for supplying the fluid material to the outer peripheral surface of the coating roll is provided.
The coating apparatus according to any one of claims 1 to 3. The first sensor and the second sensor are supplied with the fluid material by the supply means from a transfer position in which the fluid material is transferred to the object to be coated in the rotation direction on the outer peripheral surface of the coating roll. Arranged facing each other in the area up to the supply position,
The coating device according to claim 4. Further provided with a coating amount adjusting means for adjusting the coating amount on the object to be coated,
The coating amount adjusting means adjusts the coating amount based on the difference between the calculated value of the coating amount and the target value.
The coating apparatus according to any one of claims 1 to 5. When the difference between the calculated value of the coating amount and the target value is equal to or greater than the threshold value, the operation is stopped.
The coating apparatus according to any one of claims 1 to 6. Further equipped with an alarm means to output an alarm,
The alarm means outputs an alarm when the difference between the calculated value of the coating amount and the target value is equal to or greater than a threshold value.
The coating apparatus according to any one of claims 1 to 7. The two second sensors are arranged in two places in the axial direction of the coating roll.
The calculation means calculates the coating amount for each of the detection results by the second sensor.
The coating apparatus according to any one of claims 1 to 8. A plurality of the first sensors are arranged at intervals in the axial direction of the coating roll.
The calculation means calculates the coating amount with respect to the value measured by each of the second sensors.
The coating apparatus according to any one of claims 1 to 9. The coating amount adjusting means is
A doctor roll arranged parallel to the coating roll and facing a region on the outer peripheral surface of the coating roll from the supply position to the transfer position in the rotational direction.
A roll distance adjusting means for adjusting the distance between the axes of the coating roll and the doctor roll, and
Have,
The coating amount adjusting means adjusts the coating amount by adjusting the distance between the axes of the doctor roll and the coating roll based on the difference between the calculated value of the coating amount and the target value.
The coating apparatus according to any one of claims 6 to 10, wherein claim 5 is cited. Two roll distance adjusting means are arranged at both ends of the coating roll in the axial direction.
The coating amount adjusting means independently adjusts the distance between the axes of the doctor roll and the coating roll at each of the both end portions based on the difference between the calculated values of the plurality of calculated coating amounts.
The coating device according to claim 11, wherein the coating device according to claim 9 or claim 10 is cited.

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