JPH0569593B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating liquid supply device for a doctor-type coating machine, and more specifically, to a coating liquid supply device for a doctor-type coating machine, and more particularly, to
The present invention relates to a coating liquid supply device that supplies a coating liquid such as resin to a continuous strip-shaped object such as paper or a thin plate.

[Prior Art] Various types of doctor coating machines have been known for coating solutions such as resin onto long webs such as films, fabrics, paper, thin plates, etc. .

For example, a bucking roll 112 that holds and runs a continuous strip, a doctor knife 116 that has an edge on a part of the roll circumferential surface and is used to adjust the coating liquid.
Doctor-type coating machines are known.

In this coating machine, the means for supplying the coating liquid 111 to the upper surface of the continuous strip 110 includes the coating liquid 111
A dam plate 127 forming a liquid reservoir 124 of
, the punching roll 112 and the doctor knife 11
The coating liquid 111 is provided at the part where the continuous strip 110 is inserted between the coating liquid 110 and
It was a liquid dam type in which the liquid was supplied from the lower part of the liquid reservoir to the upper surface of the continuous strip 110.

In this liquid dam method, when forming an uncoated part along the longitudinal direction of the continuous strip 110, that is, in order to perform stripe coating, as shown in FIG. A long, extremely thin plate spacer 115 made of steel or synthetic resin film is sandwiched between the backing roll 112 and the doctor knife 116, and the continuous strip 1 is separated by the width of this spacer 115.
An uncoated portion was formed by preventing the coating solution from being applied to No. 10.

[Problems to be Solved by the Invention] However, with the method for forming the uncoated portion as described above, skill is required to insert the spacer 115 between the bucking roll 112 and the doctor knife 116. Furthermore, when changing the position of the uncoated portion of the continuous strip 110 during operation of the coating machine, it is necessary to move this spacer 115, and this movement operation causes the spacer 115 to be cut and the coating process to be performed. There were times when we were forced to cancel the event. Furthermore, a spacer 115 and a continuous strip 110
There was also a problem in that the coating liquid 111 entered between the strips and the strip-shaped uncoated portions became jagged.

[Object of the Invention] In view of the above, the present invention provides a coating liquid for a doctor-type coating machine that can easily perform stripe coating that forms coated portions and uncoated portions in the width direction of a continuous strip. A supply device is provided.

[Means for Solving the Problems] A coating liquid supply device for a doctor-type coating machine according to the present invention connects a plurality of liquid dam-type liquid reservoirs, each of which has a coating liquid supply port at the lower end, to a roll. The doctor knife is arranged along the axial direction of the doctor knife, and the intervals between the supply ports of the adjacent liquid reservoirs are arranged to match the width of the uncoated part of the continuous strip, and the supply ports of the liquid reservoirs are arranged near the supply ports of the liquid reservoir. , a rotary valve is provided to open and close the supply port.

[Function] The coating liquid supply device of the doctor-type coating machine configured as described above is arranged so that the supply port of the liquid reservoir placed parallel to the width direction of the continuous strip is aligned with the coated portion of the continuous strip. At the same time, the interval between the supply ports of adjacent liquid reservoirs is determined in accordance with the width of the uncoated portion of the continuous strip. As a result, the coating fluid is supplied to the continuous strip running at the position of the supply port, and the coating fluid is supplied to the continuous strip running between the adjacent supply ports. An uncoated portion is formed.

In addition, during normal coating, the rotary valve is operated to open the supply port, and the coating liquid in the liquid reservoir is supplied from the supply port to the continuous strip for continuous coating. Furthermore, in order to form an uncoated part in the width direction of a continuous strip, the rotary valve can be operated to close the supply port, and the coating liquid remaining on the continuous strip will be discharged from the rotary valve. You can immediately stop supplying the coating liquid by simply doing this.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Reference numeral 12 denotes a backing roll that holds and runs a continuous strip 10 such as film, fabric, paper, thin plate, etc., and is rotatably supported by a frame 14 .

16 is a roll-shaped doctor knife, which is rotatably supported between the frames 14 above the bucking roll 12, and has edge portions 18, 1 cut out at symmetrical positions on both sides of its outer peripheral surface in the longitudinal direction.
8 and a comma-shaped cross section in which flat notches 20, 20 are formed.

Reference numeral 22 denotes a supply device for the coating liquid 11, and the width of the supply device 22 shown in the figure is formed to a size that allows three units to be placed in the width direction of the continuous strip 10, and three units can be placed in parallel with the backing roll 12. Allotted. The intervals at which the main bodies 23 of these three supply devices 22 are placed can be set arbitrarily.

The shape of the main body 23 of each supply device 22 is formed to match the outer peripheral surface of the comma-shaped doctor knife 16 and the bucking roll 12, and in particular, the base material 10 is formed between the backing roll 12 and the lower part of the main body 23. It is designed to run.

Inside the main body 23, there is a liquid reservoir 2 that is long in the width direction.
4, and a lid 25 that can be opened and closed at the top.
is provided. A pipe 26 for feeding the coating liquid 11 is attached to this lid 25, and the coating liquid 11 is passed from a pump (not shown) serving as a coating liquid supply part to the liquid reservoir part 24 through this pipe 26. be pumped to. A coating liquid passageway 3 is provided at the bottom of the supply device 22.
A supply port 28 for the coating liquid 11 is connected to the lower part of the liquid reservoir 24 through the roller 0 and is provided parallel to the longitudinal direction of the backing roll 12 . This supply port 2
8 has a cross-sectional shape in which the coating liquid 1 is placed between the edge of the comma-shaped doctor knife 16 and the backing roll 12.
A gap is provided between the supply port 28 and the bucking roll 12 so that the continuous strip 10 can run.

A rotary valve 32, which is a valve for opening and closing the coating passage 30, is provided near the supply port 28 of the coating liquid passage 30, and actuators 34 are provided on both sides of the supply device 22. The actuator 34 rotates the rotary valve 32 to open and close the coating liquid passageway 30. Note that the opening/closing operation may be performed so that the three supply devices 22 can be operated individually, or the three supply devices 22 may be operated in conjunction with each other. Further, the actuator 34 may be controlled manually, but it may also be controlled by a computer. The supply device 22 is made of synthetic resin such as Teflon, and has a comma-shaped doctor knife 16.
This prevents damage to the outer peripheral surface of the backing roll 12. Note that the peripheral surface of the coating liquid passageway 30 is not limited to the synthetic resin described above, and may be formed of metal.

The operation of this embodiment will be explained below.

First, the supply port 28 of the main body 23 placed parallel to the width direction of the continuous strip 10 is aligned with the width b of the coated portion of the continuous strip 10, and the uncoated portion of the continuous strip 10 is aligned. The distance between the supply ports 28 of the adjacent main bodies 23 is determined according to the width a of the main body 23 (see FIG. 3).

To apply the coating liquid 11 to the upper surface of the continuous strip 10, the rotary valve 32 is moved by the actuator 3.
4 to open the coating liquid passageway 30, and the coating liquid 11 is supplied from the supply port 28 onto the upper surface of the continuous strip 10 that has come to the position of the supply port 28 by the bucking roll 12. , a coated portion having a width b is formed in the longitudinal direction. On the other hand, since the coating liquid 11 is not supplied to the continuous strip 10 running between the supply ports 28, an uncoated portion having a width a is formed in the longitudinal direction. The formed band-shaped uncoated portion is not jagged as in the conventional case but is straight. Then, to change the width a of the uncoated part,
It is only necessary to change the distance between the main bodies 23, 23, and this can be easily done even during the coating operation. In this embodiment, three main bodies 23 are used to provide two uncoated parts, but the present invention is not limited to this. For example, when three uncoated parts are formed, five main bodies 23 are used. 23 may be placed.

In order to form an uncoated portion at the joint portion in the width direction of the continuous strip 10, the coating liquid passageway 30 is closed by the rotary valve 32, and the coating liquid 11 is supplied from the supply port 28. All you have to do is cancel it. In this case, since the coating liquid 11 remaining between the rotary valve 32 side and the supply port 28 is extremely small, the operation time of the rotary valve 32 and the coating liquid 1
There is almost no time lag between the start time and the stop time of supply in step 1, and it is possible to form coated portions and uncoated portions in desired portions of the continuous strip-shaped material 10 in the width direction. Further, when the coating machine is stopped, if the rotary valve 32 is closed, leakage of the coating liquid 11 is minimized.

When coating a different coating liquid, the rotary valve 32 allows the coating liquid to be added without draining the coating liquid 11 in the liquid reservoir 24 and cleaning the inside as in conventional supply devices. By removing the supply device 22 after closing the passageway 30 and installing a supply device 22 containing a different coating fluid, the type of coating fluid 11 can be changed easily and in a short time.

In addition, in the above embodiment, the main body 2 of the supply device 22
3 are provided in parallel with the bucking roll 12, but the present invention is not limited to this. The main body 23 is formed by dividing the inside of one supply device 22 into a plurality of sections, and a liquid reservoir 24 is provided in each section. A structure in which a supply port 28 is provided may also be used. Further, in the above embodiment, the pipe 26
This method is suitable for pumping a high viscosity coating liquid by pumping the coating liquid 11 from the pipe 26, but it is possible to pump the coating liquid 11 by using the height difference of the liquid reservoir 24 without providing the pipe 26 and the lid 26. It may also be a structure that supplies it.

[Effects of the Invention] As described above, the present invention is characterized in that the spacing and number of liquid reservoirs of the supply device are determined and arranged in accordance with the width and number of uncoated portions formed in the longitudinal direction of a continuous strip. If provided, an uncoated portion can be easily formed. Further, the formed band-shaped uncoated portion can be formed in a straight line, and does not become jagged unlike the conventional method.

In addition, the supply of coating liquid can be controlled using the rotary valve, and there is almost no time lag between the rotary valve operation time and the time when the coating liquid is supplied or stopped. A coated portion and an uncoated portion can be formed in the width direction.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of the main part in FIG. 1, and FIG.
The figure is a cross-sectional view of FIG. 1, and FIG. 4 is a perspective view showing a conventional example. Explanation of symbols, 10... Continuous strip, 22... Feeding device, 23... Main body of the feeding device, 24... Liquid reservoir, 28... Supply port, 30... Coating liquid passageway,
32...Rotary valve.

Claims (1)

[Scope of Claims] 1. In a doctor-type coating machine, a plurality of liquid dam-type liquid reservoirs each having a coating liquid supply port provided at the lower end are arranged along the axial direction of a roll-shaped doctor knife, The intervals between the supply ports of adjacent liquid reservoirs are arranged to match the width of the uncoated part of the continuous strip, and a rotary valve for opening and closing the supply ports is provided near the supply ports of the liquid reservoir. A coating liquid supply device for a doctor type coating machine characterized by the following.