JPH069669B2 - Width direction automatic coating profile controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a profile adjusting device in a blade type coating machine for uniformly applying a coating material to the surface of a web such as paper.

[Conventional technology]

Conventionally, this type of blade type coating machine has a web (paper web, film, AL, steel, etc.) hung on a backing roll 1 having an elastic peripheral surface as shown in FIGS. 6 and 7. 2 is provided with a blade 4 for adjusting the coating material sprayed by the liquid transfer device 3 to a desired coating thickness, and presses the blade 2 against the web 2 around the backing roll 1 with a required force. A blade pressure adjusting device 5 is provided for this purpose.

The blade pressure adjusting device 5 is in contact with the side surface of the blade 4 on the side opposite to the backing roll 1 and has a widthwise length equivalent to that of the blade 4 and expands and contracts by supplying air. And a tube which is engaged with the tube 6 through the convex portion 7 and the fitting groove 8 formed on the tube 6 and is supported on the bar holder 9 by being divided into a plurality (about 10 to 100) in the width direction. It comprises a holder 10 and a profile adjusting screw 12 attached to the blade holder 11 so as to adjust the pressing position of the tube holder 10 against each blade 4. Profile adjustment screw 12
Has a guide collar 13 for preventing lateral displacement.

The bar holder 9 is fixed in the blade holder 11 and slidably supports the respective tube holders 10. Each profile adjustment screw 12 passes through a hole or groove provided in the blade holder 11 and the bar holder 9 and has a tip (sixth).
At the left end of the drawing), screw into each tube holder 10.

Guide collar 1 formed on each profile adjustment screw 12
3 is rotatably fitted in a groove formed in the bar holder 9 in a direction orthogonal to the paper surface of FIG.

Therefore, when each profile adjustment screw 12 is rotated,
The movement of each adjusting screw 12 in the axial direction of the screw is suppressed by the guide collar 13, and each tube holder 10 is adjusted by the adjusting screw 12.
It moves in the screw axis direction in response to the rotation of.

Here, the overall coating amount is controlled by the loading tube 6
By changing the air pressure or rotating the blade holder 11 by a mechanism not shown here, the pressing pressure of the blade 4 against the roll 1 is adjusted, and the profile adjustment in the partial width direction is performed by the profile adjustment. By manually rotating the screw 12 in the forward / reverse direction with a tool, the tube holder 10 is partially pushed and pulled, and the profile of the blade 4 is adjusted.

[Problems to be solved by the invention]

Know the basis weight in the width direction before and after coating with a BM meter (a meter that detects the amount of water and the amount of coating in the width direction and the amount of flow direction) 14 etc., and then determine the coating amount from the difference. Although calculated and displayed on the CRT, the adjustment screws corresponding to the places where the coating amount is particularly large or small are adjusted manually as described above.
It takes a lot of time and effort.

In addition, it is difficult to make an accurate adjustment because it involves the visual check and intuition of the CRT display of the person who operates the adjustment. Especially, when the coating amount is large, the drying time in the post-process is long, and the coating web is contaminated in the undried portion. However, there are problems such as use of an excessive amount of coating and deterioration of the printed surface.

[Means for solving problems]

A common rack for engaging a plurality of profile adjustment screw shafts is provided, and the screw shaft is rotated through a gear by the reciprocating motion of the racks.

Further, a claw clutch is attached to the screw shaft, and the adjustment screw shaft is individually controlled to rotate by turning the clutch on and off.

[Working] The grammage in the width direction before and after coating is detected with a BM meter, etc., and the coating amount is calculated from the difference, and the claw clutch of the adjusting screw shaft at the portion with a large coating amount is inserted when the rack is moving. Rotate the screw shaft.

The claw clutch of the adjusting screw shaft where the amount of coating is small is put in when the rack is restored, the screw shaft is rotated in the reverse direction, and the pushing amount of the screw is adjusted to control the coating profile.

In the same manner, it is also possible to simply increase the portion with a small coating amount to the maximum amount, or lower the portion with a large coating amount to the minimum amount.

〔Example〕

An embodiment of the present invention will be described below with reference to a cut side view of FIG. 1, a schematic perspective view of FIG. 2, a control explanatory diagram based on a profile detection graph by a BM meter of FIG. 3, and an adjustment accuracy of FIG. This will be described with reference to a raising control explanatory diagram.

In the figure, 1 is a backing roll, 2 is a web, 3
Is a liquid transfer device, 4 is a blade, 14 is a BM meter, 21 is an automatic coating profile control device, 22 is an adjusting screw, 23 is a notch,
24 is a screw shaft, 27 is a gear, 28 is a torque, limiter, 29 is a claw clutch, 32 is a potentiometer, 33 is a tube holder, 35 is a rack, 36 is a loading tube, 37 is a flange of the screw shaft 24, 40 Indicates a sliding spline of the claw clutch 29, and 41 indicates a bend mode of the edge portion of the blade 4.

As shown in FIGS. 1 and 2, the automatic coating profile control device 21 (hereinafter abbreviated as a control device) has an adjusting screw at its tip, a brim 37 at an interval, and a square notch at its rear end. There is a screw shaft 24 having 23, and the screw shaft 24 is provided with a bearing 25, a gear 27 and a torque limiter 28 via an adapter 26, and a claw clutch 29 (an electromagnetic type is shown in the drawing, but an AIR type or the like may be used). The gear 30 for detecting the position of the tube holder 33 is fitted and fixed.

Further, the potentiometer 32 is connected to the screw shaft 24 via the gear 31 and the gear 30 so as to detect the set position of the initial tube holder 33 and the position of the tube holder 33 from moment to moment. The moving side of the clutch 29 is connected to the adapter 26 via the slide type spline 40, and the fixed side is keyed to the screw shaft 24.

The control device 21 configured as described above is connected to the tube holder 33 divided into a plurality (about 10 to 100) in the width direction as described above via the adjusting screw 22, and the other cylinder 34 (this). May be a linear motor or the like), and engages with a gear 27 of the control device 21 so that each screw shaft 24 rotates when the rack 35 reciprocates.

Here, the above-mentioned claw clutch 29 is in the case of meshing connection by electric excitation, and in the case of demagnetization, the screw shaft 24 does not rotate and the screw shaft 24 is rotated and stopped individually by an electric ON-OFF operation. It is controllable.

Further, the torque limiter 28 is provided to protect the machine when the movement limit of the tube holder 33 is exceeded, and is also used when the tube holder 33 is automatically brought to the most retracted position when the blade is replaced. The notch 23 of the screw shaft 24 is provided so that the rotary tool can be fitted therein and rotated even manually, and is used for initial setting of the tube holder 33 at the start of operation.

In addition to the blade of the bend mode 41 shown in FIG. 1, the control device 21 has a adjusting bar 22 of the screw shaft 24, as shown in FIG. 5, with a solitary bar 38 and other pressure tubes. By changing to a tube holder, it can also be used for a bevel mode 42 blade, and can be used commonly by changing the attachment so that it becomes an optimum control device depending on the coating amount, quality and the like.

In the automatic coating profile control device having the above-mentioned configuration, the grammage in the width direction before and after the coating is detected by the BM meter or the like, and the coating amount is calculated from the difference to display the CRT, or Display a graph.

Fig. 3 shows an example of the data display. The center line in the width direction shows the average coating amount 39 by the BM meter (5 to 35 g / cm ² / one side in the figure), and the range between + α and -α is allowable. Values, hatched peaks are locations with a large amount of coating, valleys are also few locations, and No. 1 and Nos. 2 to n in the lower row indicate width direction zone Nos. Control is performed based on this data, but (coating amount deviation) × K = the amount of rotation of the adjusting screw is calculated (where K is the number of blades, operating conditions (coating liquid, speed, etc.)) Constant) Zone where the coating amount deviation is out of ± α
Select No.

Here, the present invention has two control methods, which will be described.

[Control method I]

This is a control method in which the control amount per stroke is determined by the stroke of the rack 35 and the pitch of the adjusting screw 22. For example, the control amount per stroke is 1/4 screw shaft 1/4.
If it is designed to rotate, it will rotate unconditionally 1/4 turn in the select zone, and it corresponds to hatching zone Nos. 3, 4, 8 and 9 on the forward (+) side of rack 35 in FIG. When the claw clutch 29 is electrically excited and the rack is moved by demagnetizing within ± α, the tube holder 33 of the electrically excited portion is electrically moved.
The blade 4 is pushed out by 1/4 rotation and pushes the blade 4 through the loading tube 36. -(Minus) when returning to the rack
When the claw clutch 29 corresponding to the hatching zone Nos. 13, 12, 11, and 1 on the side is electrically excited and the rack is moved within ± α by demagnetization, the screw shaft 24 rotates in the reverse direction. The holder 33 is pulled to warm the pressing of the blade 4. (For bevel mode coating characteristics).

If it still does not enter within ± α with one stroke of the rack, B again
Corresponding to the zone where the signal of the M meter enters and goes out from ± α, only the claw clutch 29 is electrically excited, and the rack 35 reciprocates until it enters ± α.

As a more advanced technique, the stroke of the cylinder 34 is shortened one by one using a stopper or the like, for example, the rack stroke 1 is shortened to 1/2, and 1/4 rotation of the screw rod is reduced to 1/8 rotation, and finally, The average coating amount can be reduced to 39.

(Control method II)

It is a method in which the stroke of the cylinder 34 is lengthened and the connection time of the claw clutch is given according to the coating amount deviation, and the connection time is controlled to 2 seconds and 3 seconds during one reciprocation of a long rack stroke. In Fig. 3, when the rack 35 goes forward, +
Depending on the width value of the hatched part on the (plus) side, the electrical excitation time of the claw clutch in zone No. 3 is set to 3 as an example.
Second, No. 4 is 3 seconds, No. 8 and No. 9 is 1 second, and a timer for connection time is given, the zone within ± α is demagnetized, and the rack 35 is moved. The screw shaft 24 is continuously rotated for 1 second or 3 seconds and adjusted within ± α range.

In addition, when the rack is restored, similarly, the excitation time for the claw clutch in zone No. 13 is electrically set to 3 seconds, No. 12 is set to 2 seconds, No. 1 is set to 2 seconds, and the connection timer is set. The screw shaft 24 is moved and continuously rotated for the time, and the screw shaft 24 is rotated within a range of ± α, and adjustment is performed with one rack stroke.

As a more advanced technique, the signal from the BM meter is intermittently input about once every 30 seconds, and the above procedure is repeated at intervals of several minutes as shown in Fig. 4 (the adjustment amount for the hatched portion), and the coating amount is adjusted. The average value can be reduced to 39.

That is, the control accuracy can be improved by intermittently controlling the rack stroke amount or the connection time of the electromagnetic clutch as shown in FIG.

The potentiometer 32 is used to detect the position of the tube holder 33.
However, this can also be detected by the time and the number of times the clutch is connected (the cumulative number of times the clutch is stopped), and it is necessary to automatically return the tube holder 33 to the most retracted position each time the blade is changed. Torque limiter if not
28 may not be used.

〔The invention's effect〕

According to the widthwise automatic coating profile control device of the present invention, it is possible to automatically put the coating amount within the target coating amount in the widthwise direction, and labor saving, accuracy UP, and speed UP can be measured.

Further, since a uniform profile with good responsiveness can be obtained, print quality is improved.

Further, since the coating thickness is averaged, the amount of the coating liquid used is reduced, the drying load in the subsequent process is also small, and the occurrence of stains on the after dryer is eliminated.

[Brief description of drawings]

FIG. 1 is a side view of a main part cut in an embodiment of a widthwise automatic coating profile control device of the present invention, FIG. 2 is a schematic perspective view of the device of FIG. 1, and FIG. 3 is a BM meter of the present invention. FIG. 4 is a control explanatory diagram based on a profile detection graph, FIG. 4 is a control explanatory diagram which similarly raises the adjustment accuracy, and FIG. 5 shows an edge portion of a blade in another embodiment of the present invention. FIG. 6 is a schematic sectional side view of the prior art, and FIG. 7 is a view taken in the direction of arrow A in FIG. 1 ... Backing roll 2 ... Web 4 ... Blade 14 ... BM meter 21 ... Automatic coating profile controller 22 ... Adjusting screw 24 ... Screw shaft 27 ... Gear 28 ... Torque limiter 29 ... Claw clutch 32 ... Potentiometer 35 ... Rack

Claims (1)

[Claims] 1. A liquid transfer device (3) and a coating profile control device (21) arranged on the outlet side of the liquid transfer device (3), and an inlet side and coating of the liquid transfer device (3). Profile control device (21)
In a blade type coating machine equipped with a coating thickness detector (14) arranged on the exit side of the blade, a plurality of blades (4) of each coating profile control device (21) provided in the width direction are added. Attach the gear (27) that engages the common reciprocating rack (35) and the clutch (29) that turns on / off the rotational force from the gear (27) to the pressure screw shaft (24). Coating thickness detector on entry side and exit side
Input the coating amount profile signal detected by (14) to the arithmetic unit, and turn on / off the clutch (29) in the section where the coating amount profile deviates from the target value input in advance to the arithmetic unit. Then, the width direction automatic coating profile control device is characterized in that the blade (4) and the pressing screw shaft (24) are rotationally controlled.