JPH05146733A - Coating applicator - Google Patents

Abstract

PURPOSE:To provide a coating applicator being available to seal a coating liquid, do first-in and first-out prevent residence, determine width without using side plates, prevent intermixing with buffle and easily control liquid pressure. CONSTITUTION:A bottom plate 2 and flow passage restricting block 1 are provided interposing a definite aperture 21 and, moreover, an upperside spacer 12 and an underside spacer 13 are inserted into the definite aperture 21, and a liquid sink part 20 is formed by the bottom plate 2, the flow passage restricting block 1, the upperside spacer 12 and the underside spacer 13. A coating liquid is introduced to the liquid sink part 20 through a liquid supplying ports 22A and 22B provided in the flow passage restricting block 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a coating for coating and casting a liquid material (hereinafter referred to as a coating liquid) such as an adhesive or an adhesive on a sheet-shaped substrate such as resin, paper and metal foil. It relates to the device.

[0002]

2. Description of the Related Art Generally, a roll coater is widely used as a coating device for coating a sheet-shaped substrate with a coating liquid. The coating thickness and coating accuracy of a target product and the properties and thickness of the coating substrate are used. The roll diameter, the number of rolls, and the transfer method are appropriately selected depending on the viscosity of the coating liquid.

There are various liquid supply methods such as direct injection and circulation. Further, in recent years, a die coating method using a die and a roll has been adopted by utilizing the T-die technology of extrusion film formation.

As an example, FIG. 6 shows a conventional structure. The same figure (a) is the principal part sectional drawing, the same figure (b) the same figure (a)
FIG.

This is a coating roll 11, a comma roll 10, and a bottom plate 2 which are arranged on the outer peripheral portion of the coating roll 11 so as to be inclined along the generatrix direction of the coating roll 11 and have a substantially triangular cross section. A pair of side plates 14, 14 that form part 20 and are attached to the bottom plate 2.
Is laterally moved to regulate the coating width.

In the figure, 8 is a base material wound around a coating roll 11, 9 is a coating base material on which the base material 8 has been subjected to coating processing, and 15 is a rubber-lined backing roll.

[0007]

However, in the conventional method as described above, since the upper surface of the liquid reservoir 20 has the liquid surface 20A which opens upward, the liquid surface 20A There have been problems that the solvent evaporates and the viscosity of the coating solution increases, and that a coating film called “bare” is formed on the surface.

Further, in the case of a coating liquid of mixed components having a large difference in specific gravity, problems such as sedimentation, aggregation and separation occur in the liquid reservoir, and in the case of a reactive coating liquid, the above-mentioned bottom plate 2 and side plate are used. On the surface portion of 14 or the like, gelling or agglomeration of the coating liquid occurs due to the retention of the coating liquid, and these products are clogged in the gap between the coating roll 11 and the comma roll 10, resulting in defective streaking on the coating surface. There was a problem.

Further, when changing the coating width, it is necessary to move the side plate 14 laterally, and the width changing procedure is changed from narrow to wide so that the coating liquid does not adhere to the surface of the bottom plate 2 or the like. There is no choice but to take the work form. Further, the adhesion between the side plate 14 and each roll is such that the adjustment of the coating thickness is based on the roll gap as described above, and thus the perfect adhesion cannot be achieved, and the change in the small gap of several μm cannot be followed. Poor adhesion, causing liquid leakage through the gap. Further, air entering from the tangent line between the bottom plate 2 and the coating roll 11 shown in FIG. 6 becomes bubbles in the liquid reservoir and mixes in the coating film, resulting in coating defects such as uneven thickness and bubbles. Furthermore, the liquid pressure acting on the roll gap described above changes due to the fluctuation of the liquid surface height of the liquid reservoir portion, which causes the fluctuation of the coating thickness. Therefore, this liquid surface height must be kept constant. There were also problems such as not becoming.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to change the viscosity during coating, inclusion of foreign matter and skin-occluded bubbles by sealing the coating liquid. To prevent coating defects such as coating streaks, air bubbles, dents, etc., and to prevent liquid retention.
It is an object of the present invention to provide a coating device capable of stabilizing the quality of a reactive coating liquid by first-in first-out coating, determining a width without a side plate, and arbitrarily adjusting a liquid pressure in a roll gap.

[0011]

In order to achieve the above-mentioned object, the present invention supplies a coating liquid to a sheet-shaped substrate wound on a coating roll, and further provides a predetermined amount between the coating roll and the squeeze roll. In a coating device for coating a coating liquid on a substrate by a coating pressure, a bottom plate which is in contact with the coating roll and is arranged along the generatrix direction of the coating roll and a bottom plate which is opposed to the bottom plate with a constant gap. A flow path regulating block having a liquid supply port penetrating in the direction of the bottom plate and a gap between the bottom plate and the flow path regulating block, and supplied from the liquid supply port of the flow channel restricting block. It has a spacer for guiding the coating liquid to the coating roll side.

[0012]

With the above-mentioned structure, the liquid reservoir of the coating liquid can be hermetically sealed and the liquid reservoir can be reduced in volume. By pressure-feeding and supplying the liquid to the coater of this structure with a metering pump, it is possible to prevent the coating liquid from accumulating by first-in, first-out. Further, the coating liquid supplied from the central portion or a plurality of locations of the flow path control block of the coater, when flowing in the coater, due to the physical properties of the liquid, the thickness of the spacer, the liquid supply amount, the coating speed and the roll gap, Since each spreads in a predetermined manner, it is possible to determine the coating width without the side plate.

Particularly, between the flow path regulating block and the coating roll, a high shearing force can be applied to the coating liquid by the rotation of the roll. In addition, since the coating liquid flow path is thin throughout the coater and the cross-sectional area is small, the flow velocity of the coating liquid can be made faster than in the conventional comma coater, and the layer that adheres to the surrounding wall surface and accumulates It is possible to reduce the thickness and prevent aggregation, adhesion, separation and the like. Furthermore,
Since the liquid pressure at the time of supplying the liquid can be increased, the invading air from the bottom plate and the coating roll portion can be blocked, and the inclusion of bubbles can be prevented. Further, it is possible to eliminate the loss due to the liquid leakage that has conventionally occurred, and to eliminate the harmful work environment by sealing.

[0014]

Embodiments of the present invention will be described below. FIG. 1 is a schematic diagram showing the overall configuration of a coating apparatus according to the present invention. First, the structure will be described. Reference numeral 11 is a coating roll around which the sheet-shaped base material 8 is wound, and a comma roll 10 and a backing roll 15 are arranged facing the coating roll 11. Further, 7 is a tank for storing the coating liquid, and the variable metering pump 3 is provided through a pipe 18.
It is connected to the.

Further, 4 is a tachometer for adjusting the motor rotation speed of the variable metering pump 3, and together with the flow rate throttle valve 5 and the pressure gauge 6, the liquid supply amount and the liquid pressure of the coating liquid supplied from the tank 7 are shown. It is configured for control.

On the other hand, FIG. 2 is a side view of the liquid reservoir portion of the coating liquid, which is a characteristic portion of this embodiment, FIG. 3 is a view in the direction of arrow B in FIG. 2, and FIG. 4 is a detail of the reservoir portion. Although it is a sectional view, the rectangular bottom plate 2 which is in contact with the coating roll 11 and extends in the generatrix direction is also provided in this embodiment. As shown in FIG. 4, the flow path regulation block 1 is provided with a gap 21 from the bottom plate 2, and the flow path regulation block 1 has a slight gap 23 with the coating roll 11 and the comma roll 10. The liquid supply ports 22A and 22B that are provided and are electrically connected to the gap 21 side are provided. In this embodiment, two liquid supply ports 22A and 22B are provided in the central portion of the flow path regulation block 1.

A Teflon sheet (having a thickness of about 0.5 to 2 mm) is provided in the gap 21 between the bottom plate 2 and the flow path regulating block 1.
An upper spacer 12 and a lower spacer 13, which are made of, are inserted. 5A is a detailed view of the upper spacer 12, and FIG. 5B is a detailed view of the lower spacer 13,
Each of the spacers has a notch 12a, 13 at the center.
b. When each spacer is inserted in the gap 21, the upper spacer 12 is arranged so that the notch 12a is open to the coating roll 11 side in the gap 21, and the lower spacer 13 is the coating of the bottom plate 2. It is wound around the end face side in contact with the roll 11, and the notch 13b is arranged so as to open to the upper spacer 12 side. In the gap 21 between the bottom plate 2 and the flow path regulation block 1, an extremely narrow capacity liquid reservoir 20 is formed between the upper spacer 12 and the lower spacer 13.

The structure of this embodiment has been described above. Next, its operation will be described. First, the coating liquid supplied from the tank 7 through the pipe 18 is sent to the variable metering pump 3.
The rotational speed of the motor of the variable metering pump 3 is adjusted by the tachometer 4, and thereby the liquid supply amount and the liquid pressure of the coating liquid are adjusted.

Then, the coating liquid that has passed through the variable metering pump 3 is finely adjusted in liquid supply amount and liquid pressure by the flow rate throttle valve 5 and the pressure gauge 6 which are located in the subsequent stage, and the liquid supply of the flow path regulating block 1 is performed. It is guided to the mouths 22A and 22B.

Then, the coating liquid introduced into the liquid supply port 22A is introduced into the liquid reservoir 20 through the opening 22a, and the notch of the upper spacer 12 is formed around the opening 22a. The portion 12a is provided so as to open toward the lower spacer 13 side.

Therefore, the coating liquid introduced from the liquid supply port 22a into the liquid reservoir 20 is cast and dropped in the liquid reservoir 20 while being prevented from expanding in the width direction by the upper spacer 12. That is, as shown in FIG. 3, for example, a1, a
The expansion in the width direction can be restricted like 2 and a3.

On the other hand, the coating roll 1 of the liquid reservoir 20
The opening 22a of the liquid supply port 22B is provided on the side contacting with 1, and the lower spacer 13 has the cutout portion 1
The opening 3a is provided on the upper spacer 12 side to regulate the contact width between the liquid reservoir 20 and the coating roll 11.

Thus, in this embodiment, the coating is carried out in the gap between the bottom plate 2 and the flow path regulating block 1 by the extremely small capacity liquid reservoir 20 which is regulated by the upper spacer 12 and the lower spacer 13. The liquid contacts the coating roll.

Then, the coating liquid propagates through the gap 23 between the flow path regulating block 1 and the coating roll 11, and the coating thickness is regulated by the gap between the coating roll 11 and the comma roll 10 to form a coating film.

As described above, in this embodiment, the coating liquid supplied from the tank 7 is introduced into the liquid reservoir 20 in a sealed state through the pipe 18, and the liquid reservoir 20 is also sealed in a small volume. Is. Therefore, unlike the conventional case, the solvent in the coating liquid does not evaporate and the viscosity of the coating liquid increases, and the surface of the coating liquid does not have a peeling or the like.

Further, the coating liquid having a large difference in specific gravity and settling and aggregating is mixed in the tank 7, the pipe 18, the pump 3 and the like, and is supplied by using a stirring device so that the inside of the device is relatively short. By allowing it to pass through in time, sedimentation and aggregation can be prevented.

Further, in the gap 23 between the flow path regulating block 1 and the coating roll 11, a high shearing force can be applied to the coating liquid by the rotation of the roll 11, and the coating thickness can be adjusted to a constant thickness with high accuracy. it can.

Further, since the coating liquid flow path is thin in the entire apparatus and the cross-sectional area is made small, the flow velocity of the coating liquid can be made faster than before, whereby it adheres to the surrounding wall surface and accumulates. Since the layer thickness can be reduced, aggregation, adhesion, separation, etc. can be prevented. Further, there is an effect that the loss due to liquid leakage which has conventionally occurred can be eliminated and the work environment can be cleaned.

In this embodiment, two liquid supply ports are provided in the central portion of the flow path regulation block 1, but any number of liquid supply ports may be provided at any position depending on the coating width and the coating position. .. Further, the coating liquid can be directly sent to the lower spacer 13. This is because the coating width is determined by the liquid supply amount supplied from the pump 3, the speed of the coating roll 11, and the gap between the comma roll 10 and the coating roll 11, so the coating width can be adjusted by adjusting these values. This is because it can be adjusted arbitrarily.

The liquid pressure in the liquid reservoir 20 is determined by the thickness of each spacer, the viscosity of the coating liquid, and the coating amount. Therefore, if the pressure in the liquid reservoir 20 is increased by adjusting these, the bottom plate It is possible to prevent air from entering between the coating roll 11 and the coating roll 11 and prevent bubbles from entering.

[0031]

According to the present invention, the following effects can be obtained. (1) The coating liquid can be hermetically sealed, the evaporation of the liquid can be prevented, and the coating quality can be improved. In addition, the working environment is improved, and the safety can be improved depending on the solvent type. (2) Material with fast reactivity, material that gels and aggregates, sedimentation,
Stable coating can be performed even on materials that are easily separated. (3) Since the side plate for controlling the coating width is eliminated, the width can be freely changed. (4) The loss of the coating liquid is eliminated, and the yield can be improved. (5) It is possible to prevent air bubbles from entering and eliminate defects in the coating film.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a detailed sectional view of a liquid reservoir portion of the embodiment shown in FIG.

FIG. 5 is an explanatory diagram of an upper spacer and a lower spacer.

6A and 6B are a front view and a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flow path control block 2 ... Bottom plate 3 ... Variable metering pump 4 ... Tachometer 5 ... Flow meter 6 ... Pressure gauge 7 ... Tank 8 ... Base material 9 ... Coating base material 10 ... Squeeze roll or comma roll (metal) 11 ... Coating roll (metal) 12 ... Upper spacer 13 ... Lower spacer 14 ... Side plate 15 ... Backing roll (rubber-covered) 20 ... Liquid reservoir 21 ... Gap 22A, 22B ... Liquid supply port 22a, 22b ... Opening 23 ... gap

Claims (1)

[Claims] 1. A coating apparatus for supplying a coating liquid to a sheet-shaped base material wound on a coating roll and further applying the coating liquid to the base material at a predetermined coating pressure between the coating roll and the squeeze roll. A bottom plate disposed in contact with the coating roll along the generatrix direction thereof, and a liquid supply port penetrating in the bottom plate direction and disposed so as to face the bottom plate with a constant gap. A flow path regulating block, and a spacer that is disposed in a gap between the bottom plate and the flow path regulating block and that guides a coating liquid supplied from a liquid supply port of the flow path regulating block to a coating roll side. Coating equipment.