JPH07246358A - Coating device and method therefor - Google Patents

Abstract

PURPOSE:To prevent the generation of the wire pattern of a rod coater, uneven coating and streak by sucking off the foreign matter and agglomerates collected on the groove between rod wires and the excess cleaning water accumulated between rod bar wires. CONSTITUTION:In a rod coater in which coating compound sprayed from a fountain nozzle 1 is applied on a traveling web 2, and the coating amt. on the web is measured by pressing a rod bar 4 on a backing roll 3 in this rod coater, a foreign matter removing brush 12, a cleaning water passage 7 and a suction nozzle 11 are arranged in this order in contact with the rod bar in the width direction in a rod bar holder 5 for supporting the rod bar 4 set on the opposite side of the backing roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved rod coater device and its coating method.

[0002]

2. Description of the Related Art There are various types of coating devices for coating a continuous web, and typical coating devices include curtain coaters, die coaters, lip coaters, gate roll coaters, air knife coaters, Examples thereof include a rod coater and a blade coater. Among them, the rod coater has a simple device structure and a simple operation method, and is therefore widely used for undercoating of paperboard, various coated papers, low coating amount coating, and the like.

As shown in FIG. 4, the rod coater applies a paint sprayed from a fountain nozzle 1 to a web 2 which continuously travels on a backing roll 3 and applies a pressing force of a wire rod bar 4 to the applied paint. The pressure in the tube chamber 8 located behind the wire rod bar 4 in the bar holder 5 is adjusted or the entire rod bar holder 6 is pushed and pulled by pushing and pulling the profiler bar 10 located behind the rod bar holder 5. It is a device that adjusts the coating amount to the required amount and performs coating.

A small diameter rotating rod is usually used as the rod bar, and in addition to a smooth round rod, a diameter of 0.1 mm to 0.8 mm is provided around it.
There is a wire rod bar that is wound with a certain amount of wire.
Each rod bar is used according to the target coating amount. Generally, the wire rod bar is easier to apply than the smooth round bar, and the larger the wire diameter of the wire rod bar, the more the coating amount. Tends to stick.

Further, in order to remove foreign matters and agglomerates 14 caught between the wire rod bar 4 and the web 2 and to clean the surface of the wire rod bar 4 so as to evenly flatten the coated surface, the wire rod is generally used. Since the bar 4 is used in the direction opposite to the direction of rotation of the backing roll 3, and the washing water passage 7 is provided in the rod holder 5 and the continuous washing mechanism is provided, the stability of the coating amount in the width direction is improved. Be kept,
Moreover, the occurrence of streaks is suppressed and stable coating is possible.

When it is desired to apply a large amount of coating on the web 2, a wire rod bar 4 having a large wire diameter is used, but the groove between the adjacent wires of the wire rod bar 4 to be used also becomes large. During application, the cleaning water in the rod bar holder 5 originally for cleaning the wire rod bar 4 collects as excess cleaning water 13 between the wires of the wire rod bar, and the wire rod bar 4 rotates so that the excess cleaning water 13 May be transferred to the coating surface as it is, and unevenness of the coating amount may be observed in the width direction of the coating surface.

When the target coating amount is small, a wire having a small diameter is used. However, depending on the use of a pigment having a large particle diameter in the coating liquid or a foreign substance mixed in the coating liquid,
It may be caught in the groove between the wires during the coating and not removed, which may cause streaks, uneven coating, and streaks. Also, when the water retention of the coating liquid is poor,
Similarly, the coating liquid solidified between the wires may adversely affect the coated surface.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to eliminate foreign matter and agglomerates trapped in the grooves between the wires of the wire rod bar and between the wires. It is to suppress the generation of the wire pattern of the rod coater, coating unevenness, and streaks by sucking and removing the accumulated excess cleaning water.

[0009]

According to the present invention, the amount of coating on the web is measured by pressing the rod bar 4 onto the backing roll 3 after the coating material sprayed from the fountain nozzle 1 is applied onto the running web 2. In the rod coater, the width direction inside the rod bar holder 5 supporting the wire rod bar 4 installed on the side opposite to the backing roll 3 is in contact with the wire rod bar 4,
Foreign matter removal brush 12, cleaning water passage 7, suction nozzle 11
The coating device is arranged in the order of.

According to another aspect of the present invention, rod coater coating is performed using the coating device, foreign substances and agglomerates accumulated between the wires of the wire rod bar 4 rotating during coating are separated with a brush, and then washed. It is characterized in that it is washed and removed with water, and then the excess cleaning water 13 adhering between the wires is sucked by the suction nozzle 11 and discharged to the outside of the system to suppress transfer of the cleaning water to the web and uneven coating due to foreign matter. It is a coating method.

[0011]

According to the present invention, a brush for removing foreign matters and agglomerates trapped in the grooves between the wires of the rod bar is installed in the width direction of the rod holder, and the foreign matters and agglomerates are peeled off and washed. By providing a suction nozzle for cleaning and removing with water and sucking and removing the cleaning water adhering to the surface of the rod bar, stable coating can be performed without causing streaks and coating unevenness during coating of the rod bar.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 is a schematic view of a rod bar coating apparatus showing an embodiment of the present invention, FIG. 2 is a schematic view showing a state of brushing on a rod bar, and FIG. 3 is excess cleaning on the rod bar. It is a schematic diagram showing a suction state of water.

A fountain nozzle 1 for supplying liquid to the web 2 is provided below the backing roll 3.
A rod bar holder 5 supports the wire rod bar 4 in the width direction on the side opposite to the backing roll 3, and the rod bar holder 5 is held by a holder 6 and fixed to a fixed base 9.

In the rod bar holder 5, there is a tube chamber 8 for adjusting the coating amount and a washing water passage 7 for washing the rod bar. The rod bar cleaning water enters from one side of the rod bar holder 5, flows in the width direction of the rod bar, and is discharged to the outside of the system from the other side.

Suction for sucking excess cleaning water 13 between the wires of the wire rod bar 4, between the cleaning water passage 7 of the rod bar holder 5 and the tip of the rod bar holder 5, preferably near the tip of the rod bar holder 5. Nozzle 11
Set up. It is preferable that the suction nozzle 11 is installed so as to be in light contact with the wire rod bar 4.
Also has the effect of removing the excess cleaning water 13 accumulated between the wires of the wire rod bar 4, foreign matters and aggregates 14. Therefore, the material of the suction nozzle 11 is preferably resin or hard rubber that does not damage the surface of the wire rod bar 4. The suction nozzle 11 preferably has a structure in which the wire rod bar 4 is installed above and below the rod bar holder 5 so that the cleaning water can be sucked regardless of the rotation direction of the wire rod bar 4.

Foreign matter is provided between the cleaning water passage 7 of the rod bar holder 5 and the tip of the rod bar holder 5, preferably near the tip of the rod bar holder 5 and upstream of the suction nozzle 11 in the direction of rotation of the rod bar. Removal brush 1
Install 2. The brush diameter for removing foreign matter 12 is 0.1 μm
m or less is preferable, and a wire made of steel and a hard rubber having excellent wear resistance are used.

Example 2 Next, a coating method of the coating apparatus of the present invention will be described. After the paint blown from the fountain nozzle 1 is applied to the running web 2, the rod bar 4 is placed on the backing roll 3.
This is a coating method in which the coating amount on the web 2 is measured by pressing the wire rod bar 4 which rotates during coating.
Foreign matter and agglomerates collected between the wires are removed by the foreign matter removing brush 12, and then foreign matter and the like are washed away by the wash water passing through the wash water passage 7, and subsequently, between the surface of the wire rod bar 4 and the wires. Excessive attached cleaning water is sucked by the cleaning water suction nozzle 11 and discharged to the outside of the system. Since the foreign matter and the agglomerates are removed by washing and the excess washing water on the wire rod bar is removed, the transfer method of the excess washing water to the web 2, uneven coating, and streak are suppressed. The present invention is not limited to the above embodiment.

[0019]

The wire pattern during application of the rod coater is suppressed, and stable application is possible without causing uneven coating, streak quality, and streak.

[Brief description of drawings]

FIG. 1 is a schematic view of a rod bar coating device showing an embodiment of the present invention.

FIG. 2 is a schematic view showing a state of brushing on a rod bar.

FIG. 3 is a schematic view showing a suction state of excess cleaning water on a rod bar.

FIG. 4 is an overall view showing a conventional rod bar coating device.

[Explanation of symbols]

 1 Fountain Nozzle 2 Web 3 Backing Roll 4 Wire Rod Bar 5 Rod Bar Holder 6 Holder 7 Wash Water Passage 8 Tube Chamber 9 Fixing Stand 10 Profiler Bar 11 Suction Nozzle 12 Brush 13 Excess Wash Water 14 Foreign Substances and Aggregates

Claims (2)

[Claims] 1. A rod coater for measuring the amount of coating on a web by pressing a wire rod bar 4 onto a backing roll 3 after the coating material sprayed from a fountain nozzle 1 is coated on a running web 2.
In the width direction of the rod bar holder 5 supporting the wire rod bar 4 installed on the side opposite to the backing roll 3, the wire rod bar 4 is brought into contact with the brush for foreign matter removal 12, the washing water passage 7, and the suction nozzle 11 The coating device is arranged in the order of. 2. The coating device according to claim 1 is used to perform rod coater coating, and foreign matter and agglomerates 14 accumulated between the wires of the wire rod bar 4 rotating during coating are removed from the wire by a foreign matter removing brush 12. A coating method characterized by peeling and then removing by washing with washing water, and then sucking the excess washing water 13 adhering between the wires of the wire rod bar 4 by a suction nozzle 11 and discharging it out of the system.