JPH0929153A - Coating method and coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the infiltration of a coating soln. into a permeable substrate. SOLUTION: A coating soln. C is rubbed into the surface Wa of a substrate by a squeezer 15 provided in a coating soln. reservoir 13 to infiltrate a part of the soln. C into the substrate W. The rear of the traveling substrate W coated with the soln. C is sucked to infiltrate a part of the soln. C into the substrate W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a coating method for permeating a part of a coating liquid applied on the surface of a substrate having permeability into the inside of the substrate.

[0002]

2. Description of the Related Art For wallpaper and the like, a part of a coating liquid such as a vinyl chloride paste is permeated into a base material having permeability to improve adhesion between the coating liquid and the base material. There is something.
As shown in FIG. 4, this coating is performed on the surface Wa of the base material while the permeable base material W which is supported by the back-up roll 2 of the coating device 1 and travels through the coating liquid reservoir 3. After applying the coating liquid C, the coating liquid C is applied to the coating film C having a predetermined thickness with the measuring tool 4.
a. The base material W on which the coating film Ca is formed is
It is guided by the guide rolls 5, 5, ... After passing a time for a part of the coating liquid to penetrate into the inside of the base material, it passes through the heat treatment device 6.

[0003]

By the way, when the coating liquid C has high viscosity and poor permeability, it takes a long time for the permeation. Therefore, the permeation region formed from the coating device 1 to the heat treatment device 6 is required. Need to be long. However, lengthening the permeation region causes problems such that the entire equipment becomes long, a large building is required, and the operability of the equipment deteriorates.

In order to solve the above problems, it is an object of the present invention to provide a coating method and a coating apparatus capable of promoting the penetration of a coating liquid into the inside of a permeable substrate.

[0005]

The object of the present invention according to claim 1 is to coat a surface of a base material while the permeable base material is supported by a back-up roll and passes through a coating liquid reservoir. In the coating method in which the liquid is applied and then the coating liquid is measured with a measuring tool, the squeeze tool arranged in the coating liquid reservoir is pressed onto or brought close to the surface of the substrate to apply it to the surface of the substrate. The coating method is characterized by rubbing the solution so that part of the coating solution penetrates into the base material. The gist of the present invention according to claim 2 is a coating method in which a coating solution is applied to the surface of a permeable base material, and then the coating solution is measured with a measuring tool, the base having passed through the measuring tool. The coating method is characterized in that a part of the coating liquid is permeated into the inside of the base material by sucking the back surface of the material.

A third aspect of the present invention is to provide a coating apparatus comprising a back-up roll, a coating liquid reservoir facing an outer peripheral surface of the back-up roll, and a measuring tool facing the back-up roll. A coating apparatus is characterized in that a squeeze tool that approaches the outer peripheral surface of the back-up roll is arranged in the coating liquid reservoir. According to a fourth aspect of the present invention, in a coating device in which a base material transport path extending from a back-up roll of a coating device body is formed on a transport surface of a transport tool, the transport surface of the transport tool is a ventilation surface. The coating device is characterized in that the ventilation surface is communicated with a suction device.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a coating method and a coating apparatus according to the present invention will be described based on the embodiments shown in the drawings. (First Embodiment) FIGS. 1 and 2 show a first embodiment of a coating apparatus according to the present invention. FIG. 1 is a side view in which a main portion is sectioned, and FIG. 2 is a plan view. It is a figure.

The coating apparatus 10 of the present embodiment comprises a coating apparatus main body 11 and a suction type conveying tool 21. The coating apparatus main body 11 includes the side frames 16 and 16 and the side frame 1.
Back-up roll 12 rotatably supported on 6, 16
And a coating liquid reservoir 13 provided so as to face the outer peripheral surface 12a of the back-up roll 12, a measuring tool 14 provided so as to face the back-up roll 13, and a coating liquid reservoir 13 provided inside the coating liquid reservoir 13. And a squeeze tool 15.

The coating liquid reservoir 13 includes a side frame 16,
It comprises a front weir plate 17 joined to 16 and parallel to the back up roll 12, and side weir plates 18, 18 arranged on both sides between the back up roll 12 and the front weir plate 17. The coating liquid reservoir 13 includes a back-up roll 12 and a front weir plate 17
And coating liquid C in the space surrounded by the side barrier plates 18 on both sides.
Is being supplied.

The squeeze tool 15 includes the side frame 1
An outer peripheral surface 12a of the back-up roll 12, which is formed from a rotating roll supported by a supporting member 19 joined to the 6, 6
The outer circumferential surface 15a of the roll advances and retreats once. The squeeze tool 15 presses the front surface Wa of the base material W which is supported by the back-up roll 12 and moves, or approaches the front surface Wa of the base material W.

The weighing tool 14 is a back-up roll 1.
2 along the longitudinal direction of the outer peripheral surface 12a of the second notch step 14a
Is formed, and the tip of the notched step portion 14a is used as the cutting edge 14b. The measuring tool 14 changes the gap size between the cutting edge 14b and the back-up roll 12 to change the coating film Ca.
The thickness of can be adjusted.

The suction type transfer tool 21 is disposed on the carry-out side of the back-up roll 12 and has two reversing pulleys 2.
2, 23, a breathable endless belt 24 made of wire mesh stretched over the reversing pulleys 22, 23, and a suction tool 25 arranged on the non-conveying surface 24b side of the endless belt 24, The conveying surface 24a of the endless belt 24 forms a substrate conveying path extending from the back-up roll 12. In the suction tool 25, a portion of the endless belt 24 for conveyance that comes into contact with the non-conveyance surface 24b is made air-permeable such as a porous plate, and the inside 25a of the box communicates with a suction port of a suction blower (not shown).

The back-up roll 12 and the reversing pulley 23 of the suction type conveying tool 21 are driven by a forced drive device 20 (see FIG. 2) equipped with a variable speed motor or the like.

Next, a coating method according to the present invention will be described based on an embodiment using the coating apparatus 10. The permeable base material W is supported by the roll outer peripheral surface 12a of the back-up roll 12 of the coating apparatus main body 11 and the endless belt 24 of the suction type transport tool 21, and travels in the arrow A direction at an appropriate speed. The base material W is coated with the coating liquid C on the surface Wa of the base material while passing through the coating liquid reservoir 13, and is pressed by or comes close to the surface Wa of the base material. The coating liquid is rubbed into Wa, and a part of the coating liquid C is forcibly penetrated into the inside of the base material. Note that the squeeze tool 15 removes entrained bubbles generated on the surface Wa of the base material by increasing the coating speed, and can perform coating without bubbles.

When the substrate W passes through the measuring tool 14,
The coating liquid C is weighed to form a coating film Ca having a predetermined thickness. The back surface of the base material W that has left the back-up roll 12 is sucked by the suction-type transfer tool 21, and the coating liquid C is applied inside the base material.
Part of the infiltrate. Base material W that has left the suction-type carrier 21
Is guided to a heat treatment device (not shown) together with the coating film Ca.

Depending on the types of the coating liquid C and the base material W, one of rubbing of the coating liquid by the squeeze tool 15 of the coating apparatus main body 11 or forced suction of the coating liquid by the suction type transport tool 21 is omitted. It is also possible to do so.

(Second Embodiment) FIG. 3 shows a second embodiment of the coating apparatus according to the present invention, and is a side view in which a main portion is sectioned. Coating device 30 of the present embodiment
However, the difference from the above-described embodiment is that the squeeze tool 35 of the coating apparatus main body 31 is formed by a bar, and the suction type transport tool 4
1 is a point formed by a roll.

The coating apparatus main body 31 includes the side frame 16,
16, a back-up roll 12 rotatably supported by the side frames 16, 16, a coating liquid reservoir 13 provided so as to face the outer peripheral surface 12a of the back-up roll 12, and the back-up roll 13 facing each other. Weighing tool 1
4 and a squeeze tool 35 arranged in the coating liquid reservoir 13. The squeeze tool 35 is formed of a fixed bar, and the bar blade edge 35a advances and retreats toward the outer peripheral surface 12a of the back up roll 12. The squeeze tool 35 is adapted to press the front surface Wa of the base material W which is supported and transported by the back-up roll 12 or approaches the front surface Wa of the base material W.

The suction type transport tool 41 includes a transport roll 42 which is forcibly driven in synchronization with the backup roll 12.
An outer peripheral surface region 4 that includes a blind 43 that is built in the inside 42c of the transfer roll 42, forms a cylindrical portion that forms the roll outer peripheral surface 42a with a breathable material, and forms a base material transfer path.
Only 2a-1 is sucked from the inside 42c of the roll. In the transport roll 42, the inner region 42c-1 corresponding to the outer peripheral surface region 42a-1 has a rotary joint (not shown).
Through the suction port of the suction blower.

Next, a coating method according to the present invention will be described based on an embodiment using the coating device 30. The permeable base material W is supported by the roll outer peripheral surface 12a of the back-up roll 12 of the coating apparatus main body 31 and the transport roll 42 of the suction-type transport tool 41, and travels in the arrow A direction at an appropriate speed. The base material W is applied to the base material surface Wa by the coating liquid C while passing through the coating liquid reservoir 13, and is pressed to or comes close to the base material surface Wa by the blade edge 35a of the squeeze tool 35 to the base material surface Wa. The coating liquid is rubbed in, and a part of the coating liquid C is forcibly penetrated into the base material.

When the base material W passes through the measuring tool 14,
The coating liquid C is weighed to form a coating film Ca having a predetermined thickness. The back surface of the base material W that has left the back-up roll 12 is sucked by the suction type transport tool 41, and the coating liquid C is applied inside the base material.
Part of the infiltrate. The base material W that has left the suction type transport tool 41
Is guided to a heat treatment device (not shown) together with the coating film Ca.

Depending on the types of the coating liquid C and the base material W, one of rubbing of the coating liquid by the squeeze tool 35 of the coating apparatus main body 31 or forced suction of the coating liquid by the suction type transport tool 41 is omitted. It is also possible to do so.

[0023]

As described in detail above, the present invention has the following excellent effects. Since the invention according to claims 1 to 4 can promote the permeation of the coating liquid into the inside of the permeable base material, the distance from the coating device to the heat treatment device can be shortened, and the facility can be reduced. The overall length can be shortened and the operability of the equipment can be improved.

According to the present invention as set forth in claims 1 and 3, by improving the arrangement of the squeeze tool in the coating liquid reservoir, the penetration of the coating liquid into the inside of the substrate can be promoted.

In the present invention according to claims 2 and 4,
By improving the arrangement of the transporting tool having suction property, the penetration of the coating liquid into the inside of the base material can be promoted.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a coating apparatus according to the present invention, and is a side view in which a main part is sectioned.

FIG. 2 is a plan view showing the same embodiment.

FIG. 3 shows a second embodiment of the coating apparatus according to the present invention, and is a side view in which a main portion is sectioned.

FIG. 4 is a side view showing a conventional coating apparatus.

[Explanation of symbols]

 W ... Substrate 11 (31) ... Coating device main body 12 ... Back-up roll 13 ... Coating liquid reservoir 15 (35) ... Squeeze tool 21 (41) ... Suction type transfer tool

Claims (4)

[Claims] 1. A coating liquid is applied to the surface of a substrate while the permeable substrate is supported by a back-up roll and passes through the coating liquid reservoir, and then the coating liquid is coated with a measuring tool. In the coating method of measuring, the squeeze tool arranged in the coating liquid reservoir is brought into pressure contact with or brought close to the surface of the base material to rub the coating liquid on the surface of the base material and A coating method characterized by allowing a portion to penetrate. 2. A coating method in which a coating liquid is applied to the surface of a permeable base material and then the coating liquid is measured with a measuring tool, and the back surface of the base material passing through the measuring tool is sucked. Thereby, a part of the coating liquid is permeated into the inside of the base material. 3. A coating apparatus equipped with a back-up roll, a coating liquid reservoir facing the outer peripheral surface of the back-up roll, and a measuring tool facing the back-up roll, wherein the coating liquid reservoir has a back-up cap. A coating device, in which a squeeze tool that is close to the outer peripheral surface of the roll is provided. 4. In a coating apparatus in which a base material conveying path extending from a back-up roll of a coating apparatus main body is formed on a conveying surface of a conveying tool, the conveying surface of the conveying tool is a ventilation surface, and the ventilation surface is sucked. A coating device characterized by communicating with the device.