JPH09314047A - Coating method of building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To partially coat a building material by a roll coater. SOLUTION: The building material is partially coated in a state of projecting one side of the building material from a coating roll 12 while stably supporting the building material with a backup roll 15 by forming the coating roll 12 into shorter length than the backup roll 15 and projecting the right side of the backup roll 15 from the right side of the coating roll 12. Further a coating material over flowing from a coating material pond 13 is received in a coating material receiving member 28 to be recovered by allowing both right end face of the coating roll 12 and a doctor roll 14 to contact with the coating material receiving member 28. As a result, the building material is partially coated while preventing the overflow of the coating material supplied to the coating material pond 13. Further one end part of the coating material receiving member 28 is brought into contact with a rotary shaft 16 of the coating roll 12 and the coating material stuck to a rotary shaft 16 is scraped by one end part of the coating material receiving member 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a building material by partially coating a building material with a roll coater.

[0002]

2. Description of the Related Art In recent years, as a roofing material for a house, a cement-based inorganic board is coated on its surface with good weather resistance to improve its appearance and waterproofness. However, since the paint with good weather resistance used for painting this roof material is expensive, do not paint the portion of the roof material that is overlaid (that is, the portion that is covered with other roof material). It is often the case that the amount of paint used is reduced and the cost is reduced by applying partial coating, where only the exposed parts are painted.

Conventional partial coating of roofing materials is disclosed in Japanese Patent Application Laid-Open No. 4-1.
As disclosed in Japanese Patent No. 90875, a curtain flow coater is used, and one end of a paint curtain film flowing down from the curtain flow coater is positioned at a boundary between a coated area and a non-painted area on the roof material surface to convey the roof material. Then, the roof material is partially coated.

[0004]

However, in partial coating with a curtain flow coater, the coating boundary line on the roof material surface is drawn at one end of the paint curtain film, so if the paint curtain film shakes, the coating boundary line will not be a straight line. It may not be present or the coating film near the coating boundary line may be thicker than other portions, resulting in a drawback that the coating quality is not uniform as a whole. In addition, since the thick coating film near the painting boundary line tends to be delayed during drying after painting, when the roofing materials are piled up and stored thereafter, the coating materials that are incompletely dried near the painting boundary line are used to prevent the roofing materials from being mixed. There may be a problem called so-called blocking in which the particles stick to each other.

As a coating apparatus used for coating building materials, there is a roll coater in addition to the curtain flow coater, but a conventional roll coater is, for example, Japanese Utility Model Publication 7-589.
As shown in Japanese Patent Publication No. 2), it is used when an object to be coated is fed between a coating roll and a backup roll to coat the entire surface of the object to be coated. In short, in the conventional roll coater, the coating roll is in contact with the entire surface of the article to be coated, so that partial coating is impossible.

The present invention has been made in view of the above circumstances, and therefore, an object thereof is to improve the structure of a roll coater to enable partial coating of a building material by the roll coater, thereby reducing the conventional curtain. An object of the present invention is to provide a coating method for a building material that can eliminate the drawbacks of partial coating by a flow coater.

[0007]

In order to achieve the above object, a method for coating a building material according to claim 1 of the present invention comprises a coating roll, and a doctor for forming a paint reservoir between the coating roll and the coating roll. A method of partially applying a coating material to the building material by using a roll coater that is located under the coating roll and includes a backup roll that conveys the building material while sandwiching the building material between the coating roll and the coating roll. The coating roll and the doctor are formed shorter than the backup roll, one side of the backup roll is projected from one end surface of the coating roll, and both one end surface of the coating roll and one end surface of the doctor are provided. , Contact the paint receiving member that receives the paint overflowing from the paint reservoir, and do not supply the paint to the paint reservoir. Then, the coating roll and the backup roll are rotated, and in a state where the boundary line between the coating region and the non-coating region of the building material is aligned with one end surface of the coating roll, the building material is treated with the coating roll. The paint is partially applied to the building material by feeding it between the building material and the backup roll.

In the conventional roll coater, since the coating roll and the backup roll have the same length, even if an attempt is made to paint with one side of the building material protruding from the end of the coating roll as in the present invention, It is impossible because the support frame of each roll gets in the way.
In this case, even if the support frame does not get in the way, since one side of the building material also protrudes from the end of the backup roll, the supporting state of the building material by the backup roll becomes unstable and partial painting is virtually impossible. Is.

On the other hand, in the present invention, the coating roll is formed shorter than the backup roll, and one side of the backup roll is projected from one end of the coating roll, so that one side of the building material is projected from one end of the coating roll. In this state, the building material can be partially coated while being stably supported by a backup roll.

Even in this case, if the coating roll is horizontal, the paint supplied to the paint reservoir between the coating roll and the doctor overflows from one end of the coating roll onto the building material, and thus overflows onto the building material. The paint that spreads out irregularly, the painting boundary line does not become a straight line, and the coating film near the painting boundary line becomes thicker than other parts, so building materials that are piled up and stored after the paint drying process A problem called so-called blocking occurs in which the incompletely dried paint sticks near the paint boundary line.

Therefore, in the present invention, the paint receiving member is brought into contact with both the one end surface of the coating roll and the one end surface of the doctor so that the paint overflowing from the paint reservoir is received by the paint receiving member. To do. As a result, the coating material supplied to the coating material reservoir is prevented from overflowing onto the building material, and the building material is partially coated. By such a coating method, it is possible to draw a paint boundary line without the paint overflowing, the paint boundary line becomes a straight line, and the coating film near the paint boundary line has the same film thickness as other portions.

By the way, most of the coating material transferred to one end surface of the coating roll is scraped off by the coating material receiving member, but a part of the coating material may drop down to the rotating shaft. If the paint adhered to the rotary shaft is left as it is, the paint may drop as a drop on the building material, which causes deterioration of the coating quality.

Therefore, according to a second aspect of the present invention, one end of the paint receiving member is brought into contact with the rotary shaft of the coating roll, and the paint adhered to the rotary shaft is constantly scraped off by the one end of the paint receiving member. This prevents the paint adhering to the rotary shaft from dropping onto the building material.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the roll coater 11 will be described with reference to FIGS. 1 to 3. Roll coater 11
Between the coating roll 12 and a metal doctor roll 14 that forms a paint reservoir 13 between the coating roll 12 and the coating roll 12, which is located below the coating roll 12, such as the roofing material 10 and the like. It comprises a backup roll 15 which conveys a building material while sandwiching it. These rolls 12, 14, 15
Is horizontally supported by a frame 19 via rotary shafts 16, 17, and 18. The coating roll 12 and the backup roll 15 are rotationally driven by a chain 21 that transmits the rotation of the motor 20, and the doctor roll 14 rotates following the rotation of the coating roll 12.

In this embodiment, the coating roll 12
Is formed shorter than the backup roll 15, and the right side of the backup roll 15 is projected from the right end of the coating roll 12. The coating roll 12 is configured by coating a rubber layer 23 (soft layer) on the outer peripheral surface of an iron core (not shown) fitted to the rotary shaft 16, and the rubber layer 23 is flexible to unevenness on the surface of the building material 10. A relatively soft rubber having a rubber hardness of 20 ° to 50 °, for example, chloroprene rubber (trade name: neoprene rubber) is used so as to be able to follow. Instead of the rubber layer 23, a soft layer made of an elastic foam such as sponge may be used. Even in this case, as long as it has the above hardness, it is possible to flexibly follow the irregularities on the surface of the building material 10. Good coating is possible.

As shown in FIG. 3, the doctor roll 14
Is formed to have substantially the same length as that of the coating roll 12, and the paint reservoir 13 is formed over the entire length of the coating roll 12 by contacting the both rolls 14 and 12. A paint supply nozzle 24 for supplying paint into the paint reservoir 13 is installed substantially above the center of the paint reservoir 13. Further, below the left end of the coating roll 12,
A paint collecting trough 26 (see FIG. 2) for collecting paint overflowing from the left end of the paint reservoir 13 is installed. The paint collected by the paint collecting gutter 26 is returned into a paint tank (not shown), and the paint in the paint tank is sent to the paint supply nozzle 24 by a paint pump (not shown).

On the other hand, a pressing end plate 27 is attached to the right end of the coating roll 12 to protect the end surface of the rubber layer 23. The pressing end plate 27 is formed of a material (for example, metal) that is hard to wear. During coating, the rubber layer 23 on the outer circumference of the coating roll 12 is pressed against the roofing material 10 and is compressed and deformed. It is formed small.

As shown in FIGS. 1 and 3, both the one end surface (pressing end plate 27) of the coating roll 12 and the one end surface of the doctor roll 14 have an L-shaped cross section for receiving the paint overflowing from the paint reservoir 13. The paint receiving member 28 is in contact. As shown in FIGS. 2 and 3, the paint receiving member 28 is detachably supported by a support bar 29 horizontally fixed to the frame 19, and a side edge of the paint receiving member 28 is pressed by a spring 30. Lightly pressed against both 27 and one end surface of the doctor roll 14, so that the paint attached to them is scraped off by the side edge of the paint receiving member 28.

One end of the paint receiving member 28 is brought into contact with the rotary shaft 16 of the coating roll 12, and the paint attached to the rotary shaft 16 is scraped off by the one end of the paint receiving member 28. . Then, as shown in FIG. 1, the paint receiving member 28 is inclined so that the coating roll 12 side is high and the opposite side is low, and the paint flowing down from the lower end of the paint receiving member 28 due to the inclination is collected by the paint collecting trough 31. To be done. The paint collected by the paint collecting gutter 31 is also returned into the paint tank (not shown), like the paint collecting gutter 26 located at the left end of the paint reservoir 13. A guide (see FIG. 3) for positioning the roof material 10 is provided on a conveyor (not shown) that carries the roof material 10 into the coating roll 12.

As shown in FIGS. 4 and 5, the partially coated roofing material 10 has a boundary line 25 between the painted area and the unpainted area.
Extends horizontally in a straight line, and at the time of construction, another roofing material 10 is overlaid on the non-painted area of the roofing material 10 and attached to the roof base plate (not shown) with nails or the like. Exposed to the outside.

In the step of coating the roof material 10, a sealer is coated on the entire surface of the roof material 10 in advance by an ordinary coating device, and then the roll coater 11 having the above-mentioned configuration is used to partially coat the roof material in the following manner. While rotating the coating roll 12 and the backup roll 15 by the motor 20,
The paint is supplied from a paint supply nozzle 24 to the paint reservoir 13 between the coating roll 12 and the doctor roll 14.
This paint flows left and right in the paint reservoir 13,
It is evenly stretched and adhered to the entire outer peripheral surface of the rotating coating roll 12.

Then, the roof material 10 conveyed by a conveyor (not shown) is positioned by the guide 35, and the coating boundary line 25 of the roof material 10 is moved to the right end face of the coating roll 12 (roll on the side of the holding end plate 27). The roofing material 10 is coated with the coating roll 1 while being aligned with the end surface).
2 and the backup roll 15 and then, as shown in FIG.
Coating roll 1 on the right side of the roofing material 10 as shown in
Coating roll 12 in a state of protruding from the right end of 2
The roof material 10 is partially coated by applying the paint on the outer peripheral surface of the roof material 10. As a result, the coating boundary line 25 is drawn in a straight line at the right end of the coating roll 12.

As described above, in this embodiment, the coating roll 12 is formed to be shorter than the backup roll 15, and one side of the backup roll 15 is projected from the coating roll 12, so that one side of the roofing material 10 is coated. The roof material 10 can be partially coated while being stably supported by the backup roll 15 in a state in which the roof material 10 is protruded from the roof material.

Moreover, in this embodiment, the right end surface (pressing end plate 27) of the coating roll 12 and the doctor roll 1 are
By bringing the paint receiving member 28 into contact with both the right end surface of the paint receiving member 4 and the paint receiving member 2
Receive at 8 and collect. Thereby, the coating material supplied to the coating material reservoir 13 can be partially coated while preventing the coating material from overflowing onto the roofing material 10, and the coating boundary line 25 can be drawn without the coating material overflowing. Then, the coating boundary line 25 becomes a straight line, the coating film near the coating boundary line 25 has the same film thickness as the other portions, the coating quality becomes uniform, and the incompletely dried paint near the coating boundary line 25 is used. It is also possible to prevent blocking between the roofing materials 10 sticking together.

By the way, most of the paint transmitted to the right end surface (pressing end plate 27) of the coating roll 12 is scraped off by the paint receiving member 28, but sometimes, a part of the paint is removed. There is a case where it travels down to the rotating shaft 16 and hangs down. If the paint attached to the rotary shaft 16 is left as it is, the paint may drop and drop on the roofing material 10 in some cases, which causes deterioration of the coating quality. Further, when the coating material attached to the right end surface of the coating roll 12 or the rotary shaft 16 begins to solidify, the solidified coating material mass may peel off and be mixed into the recovered coating material.
As a result, the paint supply nozzle 24 may be clogged, or the roof material 10 may be coated with paint containing a mass of solidified paint.

In this respect, in the present embodiment, the paint receiving member 2
One end of the coating roll 12 can be brought into contact with the rotary shaft 16 of the coating roll 12, and the paint adhered to the rotary shaft 16 can be continuously scraped off by one end of the paint receiving member 28. As a result, it is possible to prevent the paint attached to the rotary shaft 16 from dripping on the roof material 10 and maintain good coating quality. Moreover, since the paint adhering to the right end surface of the coating roll 12 and the rotary shaft 16 is scraped off by the paint receiving member 28 before solidifying, it is possible to prevent a solidified mass of the paint from being mixed into the recovered paint. It is possible to prevent clogging of the paint supply nozzle 24 due to the solidified paint, and it is possible to prevent the paint containing a lump of the solidified paint from being applied to the roof material 10.

In this embodiment, the doctor roll 14 which rotates with the rotation of the coating roll 12 is used as a means (doctor) for forming the paint reservoir 13 between the coating roll 12 and the coating roll 12. Then, a doctor bar that does not rotate may be used, and the doctor bar may be brought into contact with the coating roll 12 to form a paint reservoir between the doctor bar and the coating roll 12.

In addition, the present invention may be variously modified within a range not departing from the gist, such as exterior materials other than roof materials, interior materials, and other building materials may be partially coated as a material to be coated. It can be carried out.

[0029]

As is apparent from the above description, according to the method for coating a building material of claim 1 of the present invention, the coating roll and the doctor are formed shorter than the backup roll, and one side of the backup roll is formed. It is designed to project from one end surface of the coating roll and to collect the paint that overflows from the paint reservoir formed between the coating roll and the doctor by the paint receiving member. The building material can be partially coated while being stably supported by a backup roll in a state of being projected from the portion, and the paint receiving member can prevent the paint from overflowing from the paint reservoir onto the building material. As a result, the painting boundary line drawn on the building material can be made straight, and the coating film near the painting boundary line can have the same film thickness as the other parts, and the coating quality can be made uniform. At the same time, it is possible to prevent blocking of building materials from sticking to each other with incompletely dried paint near the painting boundary line.

Further, according to the second aspect, one end of the paint receiving member is brought into contact with the rotary shaft of the coating roll, and the paint adhered to the rotary shaft is scraped off. It is possible to prevent the material from hanging down on the material, and also to prevent the solidified coating mass from peeling off around the rotary shaft and being mixed into the recovered coating material.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a roll coater showing an embodiment of the present invention.

FIG. 2 is a front view of the entire roll coater.

FIG. 3 is a top view of the entire roll coater.

[Figure 4] Plan view of roofing material

FIG. 5 is a plan view showing how the roof material is attached to the roof.

[Explanation of symbols]

10 ... Roofing material (construction material), 11 ... Roll coater, 12 ...
Coating roll, 13 ... Paint reservoir, 14 ... Doctor roll (doctor), 15 ... Backup roll, 16 ...
Rotating shaft, 19 ... Frame, 20 ... Motor, 24 ... Paint supply nozzle, 25 ... Painting boundary line, 26 ... Paint collection gutter, 27
... Presser end plate, 28 ... Paint receiving member, 31 ... Paint collection gutter,
35 ... Guide.

Claims (2)

[Claims] 1. A coating roll, a doctor that forms a paint reservoir between the coating roll, and a backup roll that is located below the coating roll and that conveys a building material while sandwiching the building material between the coating roll and the backup roll. A method of partially applying a coating material to the building material using a roll coater provided with, wherein the coating roll and the doctor are formed shorter than the backup roll, and one side of the backup roll is coated. The one end surface of the roll is projected, and the one end surface of the coating roll and the one end surface of the doctor are brought into contact with a paint receiving member that receives the paint overflowing from the paint reservoir, and the paint is supplied to the paint reservoir. While rotating the coating roll and the backup roll, Part of the building material by feeding the building material between the coating roll and the backup roll in a state where the boundary line between the painted area and the non-painted area is aligned with one end surface of the coating roll. A method for painting building materials, characterized by applying paint. 2. The paint receiving member has one end abutting against a rotary shaft of the coating roll, and the paint attached to the rotary shaft is scraped off by the one end of the paint receiving member. The method for coating a building material according to claim 1.