JPH07102339B2 - Liquid applicator - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for applying a coating liquid to a plate-shaped object to be coated or the like.

[Conventional technology]

It has been conventionally practiced to apply a coating liquid such as an adhesive or paint to the surface of plywood, veneer, Japanese paper, etc. For these purposes, a coating device such as a roll spreader, curtain flow coater, air spray, knife coater, etc. Is used.

These devices are also used for coating a curable coating liquid such as a one-component or two-component curable resin in addition to the dry coating liquid.

[Problems to be Solved by the Invention]

However, when the coating device according to the above-mentioned conventional technique is used for coating a dry type or a curable liquid, nozzle clogging occurs due to a dried substance or a cured substance in a spray coater, and a roll or knife in a roll coater or knife coater. There is a problem in that a dried product or a cured product adheres to the surface of the product to distort the coating amount, or the coating liquid is not uniformly applied to cause unevenness.

This means that, for example, in the case of a roll coater, not all of the coating liquid supplied to the roll is transferred to the object to be coated, and a thin layer remains on the roll surface to leave a part of the coating liquid, and As a result, the coating liquid previously supplied to the roll is no longer sequentially applied to the object to be coated, and eventually the coating liquid in the liquid pool formed in the coating part of the device is cured. Is occurring.

The present invention is to solve the above-mentioned problems of the conventional apparatus, and has the advantage of the first-in first-out method that the conventional curtain coater has the advantage that the coating liquid supplied to the coating portion first is applied first, and the knife. This is a device in which a coater is uniformly filled and coated, and a roll coater is simply combined with a means for removing the cured coating liquid from the liquid pool to the outside.

By forming a coating liquid reservoir at an appropriate interval between the coating amount control member and the control member, the previously supplied coating liquid can be applied first, and since the liquid reservoir does not rotate, the coating liquid is partially covered. Dryness can be prevented, resulting in spots, scars, streaks,
Coating defects such as color unevenness are reduced, and uniform coating is possible.

[Means for Solving the Problems]

The liquid coating apparatus of the present invention, a transporting means such as a belt conveyor for transporting a plate-shaped object to be coated with the coating liquid,
A coating amount control member having a special knife-shaped coating amount control surface provided on the article conveyance path, and a coating liquid holding member for forming a coating liquid reservoir at an appropriate interval between the control member. And a coating liquid supply means for sequentially supplying an amount of the coating liquid, which is approximately close to the amount applied to the object to be coated, to the coating liquid reservoir between the control member and the holding member.

The coating material conveying means of the present invention is not limited to a Bellco conveyor, and any material capable of feeding a plate-shaped or sheet-shaped coating material to the coating section may be used. A roller conveyor, a chain conveyor, an apron conveyor. And so on.

The liquid application amount control member has a knife-like application amount control surface similar to a knife coater, and the application liquid supplied between the application amount control surface and the plate-like object is entirely the object to be coated. The shape shall be applied to the surface. Specifically, a roll-shaped or pipe-shaped member may be provided with a knife-shaped plate having an appropriate length at a portion in contact with an object to be coated, or a part of a rubber roll having appropriate elasticity. A knife-shaped coating amount control surface may be formed by cutting. Furthermore, a flat plate or an L-shaped steel material may be used in which one end of the knife-shaped plate is fixed and the other end (tip) side is in contact with the surface of the object to be coated at an acute angle.

The angle at which the knife-shaped coating amount control surface is in contact with the surface of the object to be coated is preferably an acute angle as compared with that of a conventional knife coater, and it is preferable that the length of the portion facing the surface of the object to be coated is acute. When a knife-shaped plate is used, the plate preferably has an appropriate elasticity (flexure) such as a thin steel plate.

The knife-shaped coating amount control surface of the coating amount control member may be one that can apply a predetermined coating amount to the plate-shaped object surface. The knife-shaped coating amount control surface is arranged so as to come into contact with the surface of the object to be coated at an acute angle as in the case of the knife coater,
The tip may be in contact with the surface of the object to be coated at an acute angle close to parallel.

When the object to be coated is a sheet-like one such as plywood etc., in the case of coating with a conventional roll coater,
A large amount of the coating liquid remains at the end portion of the coating surface of the object to be coated, and the portion is a raised coating surface. In the liquid application amount control member of the present invention, the tip of the knife-shaped application amount control surface is below the application surface of the object to be coated. That is, the tip of the knife-shaped coating amount control surface is in contact with the surface of the object to be coated during liquid application, but when the object to be coated such as plywood passes through the liquid application amount control member, the tip of the coating amount control surface. Is configured to wipe off the coating liquid at the end of the surface to be coated and drop below the surface to be coated.

Since the coating amount control member has a knife-shaped acute-angled portion at the tip,
The coating liquid is well cut and finishes cleanly on the object to be coated.

The liquid holding member is provided on the front surface of the coating amount control member, that is, on the upstream side in the moving direction of the object to be coated, at a proper interval from the coating amount control member to form a liquid pool, and the coating liquid supply disposed above. Any material may be used as long as it can hold the coating liquid supplied from the means in an appropriate amount. The holding member is usually provided so that the surface in contact with the coating liquid is perpendicular to the surface of the plate-shaped object to be coated, and may be a plate-shaped member, a horn-shaped member, or a roll-shaped member.

However, the holding member may be provided in parallel with the surface of the plate-shaped article to be coated.

As a method of delaying the drying or curing of the coating liquid, it is possible to delay the curing by controlling the temperature of the coating liquid in the liquid pool by passing cooling water through one or both of the coating amount control member and the holding member. I can.

If necessary, a film may be applied to the surface of the holding member on the side in contact with the coating liquid so as to cover the surface so that the cured product adhered to the surface can be removed from the system.

The coating liquid supply means is preferably provided above the liquid pool between the control member and the holding member, and when the coating liquid is a two-liquid type, the main component and the curing agent are instantaneously mixed by a rotor rotating at high speed and discharged in a rod shape. Injector is used.

The coating liquid supply amount is an amount corresponding to the coating amount on the object to be coated. In the case where the coating liquid is hardened by oxygen or moisture in the air, the coating liquid may be supplied to the liquid pool by a pipe. Further, the coating liquid supply means is not limited to these, and may be any one that can supply the coating liquid to the coating liquid reservoir between the coating amount control member and the coating liquid holding member.

The coating liquid that can be applied by the device of the present invention is not particularly limited, but examples thereof include curable resin liquids such as epoxy resin, urethane resin, and urea-formaldehyde resin.

[Work]

According to the coating apparatus of the present invention, the coating liquid that has not been coated on the object to be coated and remains on the surface of the coating apparatus and has been dried or cured can be used without waste.

Moreover, in addition to the uniform coating of knife coater and the finished surface with good drainage, the roll coater has a simple structure, so maintenance management is easy.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention is not limited to this.

FIG. 1 is a side view showing an embodiment of the present invention. As shown in the drawing, the apparatus of this embodiment has a belt conveyor 8 as a conveying means, a knife-shaped coating roll 1 as a coating amount control member, and a coating liquid holding member. And a coating plate injection unit 3 as a coating liquid supply unit. If necessary, the film 4 is movably applied to the retaining plate 2 to remove the cured product attached to the surface.

The plywood 5 to be coated, which has been conveyed by the belt conveyor 8, reaches the coating section of the apparatus and the resin liquid 7 is coated on its surface.

The resin liquid 7 flowing down from the coating liquid injector 3 is supplied to the liquid pool 6 between the knife-shaped coating roll 1 having a knife-shaped coating amount control surface and the holding plate 2 and temporarily pools there. The lower end of the puddle 6 is the surface of the plywood 5 that is the object to be coated.
Is moved from the left side to the right in the figure, the resin liquid 7 on the surface of the plywood 5 moves together with the plywood 5, and the excess resin liquid 7 is squeezed by the application roll 1 on the knife and a predetermined amount of the plywood 5 Is applied to the surface to form a coating layer 7 '. Note that the knife-shaped coating roll 1 in this example does not rotate like the roll of a roll coater, and the coating liquid is squeezed to adjust the coating amount in a normally stopped state. As shown in the drawing, the knife-shaped coating roll 1 of this example has a structure in which a knife-shaped plate-shaped body 12 is joined to a roll portion 11, and a surface substantially perpendicular to the surface of the object to be coated An application amount control surface is formed by a knife-shaped plate-shaped body 12 composed of an inclined surface that is continuously provided on the lower side and that descends in the conveying direction of the object to be coated. ing. When the plywood 5 passes through the knife-shaped coating roll 1, as shown in FIG. 2, the tip of the plate-shaped body 12 falls below the coating surface of the plywood 5, and at this time, excess coating liquid at the end of the coating surface is removed. Clean the end part of the wiper. In the case of a conventional roll coater, the third
As shown in the figure, when the roll 20 separates from the plywood 5, a large amount of the coating liquid is transferred to the end portion of the coating surface, so that it remains as a convex portion.

The film 4 used in this example is stretched so as to cover the surface of the holding plate 2 on the side in contact with the resin liquid 6, is unwound from the rewinding roll 4a, and passes through the holding plate 2 and the winding roll 4b.
To be wound up.

When the coating liquid was applied using the apparatus shown in FIG. 1, the filling and coating could be performed evenly and the finished surface with good liquid drainage could be applied, and no inconvenience occurred even after working for a long time.

〔The invention's effect〕

In the coating device of the present invention, since a dried product or a cured product which has been generated in the coating device portion conventionally used for controlling the liquid pool or the coating amount is not generated, it is possible to always maintain a fluid coating liquid. In addition, the uniform coating of the knife coater has made it possible to maintain and manage easily because the device combines a roll coater with a simple structure in addition to a finished surface with good liquid drainage.

Since the cured product is removed during the work, the device of the present invention has advantages such as easy cleaning of the device and maintenance of the device after the work is completed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the coating apparatus of the present invention, FIG. 2 is a schematic diagram showing the finished state of the end portion of the article to be coated by the apparatus of the present invention, and FIG. 3 is the termination of the article to be coated by a conventional apparatus. It is a schematic diagram which shows the finish state of a part. In the figure, 1 ... Knife-shaped coating roll 2 ... Retaining plate 3 ... Coating liquid injector 4 ... Film 4a ... Rewinding roll 4b ... Winding roll 5 ... Plywood 6 ... Liquid pool 7 '... … Resin liquid applied on plywood surface 8… Belt conveyor

Claims (3)

[Claims] 1. A coating amount comprising a conveying means such as a belt conveyor for conveying a plate-shaped article to be coated such as plywood, and a special knife-shaped coating amount control surface provided on the article conveying path. A control member, a coating liquid retaining member for forming a coating liquid reservoir at an appropriate interval between the control member, and a coating liquid supplying device for supplying the coating liquid to the coating liquid reservoir between the control member and the retaining member. A knife comprising a coating supply means, and a coating amount control member having a surface substantially vertical to the surface of the object to be coated and an inclined surface continuously provided below the object and descending in the object conveying direction from above. Of a knife-shaped coating amount control surface, wherein the tip of the knife-shaped coating amount control surface is provided at a position lower than the coating surface of the coating object after passing through the coating object. apparatus. 2. A surface of the coating liquid retaining member on the coating liquid reservoir side is covered with a film such as a long plastic film, and the film is moved from one side to the other side at any time. The liquid coating apparatus according to claim 1. 3. A coating liquid reservoir is formed by providing a surface of the coating liquid retaining member on the coating liquid reservoir side substantially parallel to a surface of the coating amount control member substantially perpendicular to the surface of the object to be coated,
3. The liquid according to claim 1 or 2, wherein the coating liquid supply means comprises a supply means for sequentially flowing down an amount of the coating liquid which is substantially close to the amount applied to the object to be coated in the coating liquid reservoir from above. Coating device.