JPH09290188A - Coating method for building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the partial coating of a building material by using a roll coater. SOLUTION: A back-up roll 15 is formed longer than a coating roll 12, and one side of the back-up roll 15 is protruded longer than one side of the coating roll 12 so that partial coating can be carried out while supporting stably a roofing material 10 by the back-up roll 15 in the state of protruding one side of the roofing material 10 from the end 12a of the coating roll 12. Also the coating roll 12 and the back-up roll 15 are inclined in the up and down direction so that the protruded side (uncoated side) of the back-up roll 15 is higher to carry out the partical coating on the roofing material 10 while preventing the coating material fed into a coating material reservoir between the coating roll 12 and a doctor from overflowing out of a roll end section 12a of the higher side of the coating roll 12. The coating boundary line is formed straight and the thickness of the film in the vicinity of the coating boundary line is formed same as the thickness of other sections by the arrangement.

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 is shaken, 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. Moreover, since the thick coating near the painting boundary 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 will cause the roofing materials to interfere with each other. 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 the present invention comprises a coating roll, 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 using a roll coater having a backup roll located below and transporting the building material while sandwiching the building material between the coating roll and the coating roll. It is formed longer than the coating roll, one side of the backup roll is projected from the coating roll, and the coating roll, the doctor, and the backup roll are tilted in the vertical direction so that the protruding side of the backup roll is higher. , Between the coating roll and the doctor The coating roll and the backup roll are rotated while supplying the coating material to the stock, and the boundary line between the painted area and the non-painted area of the building material (hereinafter referred to as “painting boundary line”) is higher than that of the coating roll. In a state of being aligned with one roll end, the building material was fed between the coating roll and the backup roll, and one side of the building material was projected from the higher roll end of the coating roll. In this state, the coating material on the outer peripheral surface of the coating roll is applied to the roof material to partially coat the building material. As a result, the coating boundary line is drawn in a straight line at the end of the higher roll of the coating 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 backup roll is formed longer than the coating roll, and one side of the backup roll is projected from the coating roll so that one side of the building material is projected from the 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 coating material supplied to the coating material reservoir between the coating roll and the doctor will overflow from the end of the coating roll onto the building material, so that the building material will not be exposed. The paint that overflows spreads 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, and it is piled up and stored after the paint drying process However, a problem called so-called blocking occurs, in which the paint adheres to the paint near the paint boundary line with incompletely dried paint.

Therefore, in the present invention, the coating roll, the doctor, and the backup roll are tilted in the vertical direction so that the protruding side (non-painting side) of the backup roll becomes higher, so that the coating material pool between the coating roll and the doctor is retained. Partial coating is applied to the building material while preventing the paint supplied to the above from overflowing onto the building material from the end of the higher roll of the coating roll. At this time, by drawing the coating boundary line at the end of the roll where the paint does not overflow, the coating boundary line becomes straight and the coating film near the coating boundary line has the same film thickness as other parts. .

[0012]

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. As shown in FIG.
The roll coater 11 includes a coating roll 12, a doctor roll 14 that forms a paint reservoir 13 between the coating roll 12 and a coating roll 12 that is located directly below the coating roll 12.
(Refer to FIG. 1) and the like, and a backup roll 15 that conveys the building material while sandwiching it. By tilting the frame 19 (see FIG. 1) that supports the rotation shafts 16, 17, 18 of each of the rolls 12, 14, 15 to form an angle of less than 10 ° with respect to the horizontal plane. It is tilted at.

Further, the backup roll 15 is formed longer than the coating roll 12, and the higher part of the backup roll 15 is projected from the coating roll 12. As shown in FIG. 3, the coating roll 12 is configured by covering the outer peripheral surface of the iron core 20 fitted to the rotating shaft 16 with a rubber layer 21, and the rubber layer 21 is formed of the building material 10
The rubber hardness is 20 so that it can flexibly follow irregularities on the surface of
A relatively soft rubber having a rotation angle of 50 ° is used, for example, chloroprene rubber (trade name: neoprene rubber).
In place of the rubber layer 21, a soft layer made of elastic foam such as sponge may be used. Even in this case, as long as it has the above hardness, it can flexibly follow the irregularities on the surface of the building material 10. , Good coating is possible.

As shown in FIG. 2, the doctor roll 14
Is formed to the same length as the coating roll 12, and the coating rolls 13 are formed over the entire length of the coating roll 12 by contacting both rolls 14 and 12.
Paint supply nozzle 22 for supplying paint into the paint reservoir 13
(See FIG. 1) is installed above the central position of the paint reservoir 13 or a position near the higher roll end 12a.
The paint supplied from the paint supply nozzle 22 is a paint having a very low viscosity of 25 seconds or less in a Ford Cup No. 4 container and flows from the higher to the lower inside the sloping paint reservoir 13. ing.

As shown in FIG. 1, the coating roll 1
Below the lower roll end 12b of 2, the paint reservoir 13
A paint collecting gutter 23 for collecting paint overflowing from the lower end of the is installed. In addition, in order to adjust the gap between the coating roll 12 and the backup roll 15,
An elevating means 24 such as a screw mechanism for integrally elevating the coating roll 12 and the doctor roll 14 is provided at the upper end of the frame 19.

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 a normal coating device, and then the roll coater 11 having the above-mentioned structure is used to partially coat the roof material as follows. While rotating the coating roll 12 and the backup roll 15 with a motor (not shown), the coating material is supplied from the coating material supply nozzle 22 to the coating material reservoir 13 between the coating roll 12 and the doctor roll 14. The coating roll 1 rotates while flowing from the higher side to the lower side along the inclined coating reservoir 13.
2 is evenly stretched and adhered to the entire outer peripheral surface.

Then, the roofing material 10 conveyed by a conveyor (not shown) is positioned by a guide (not shown) so that the coating boundary line 25 of the roofing material 10 is located at the higher end of the coating roll 12. The roof material 10 is fed between the coating roll 12 and the backup roll 15 while being aligned with 12a, and one side of the roof material 10 is fed from the higher roll end 12a of the coating roll 12 as shown in FIG. The roof material 10 is partially coated by applying the paint on the outer peripheral surface of the coating roll 12 to the roof material 10 in a protruding state. This allows
The coating boundary line 25 is drawn in a straight line at the higher roll end 12a of the coating roll 12.

As described above, in this embodiment, the backup roll 15 is formed longer than the coating roll 12, 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. It is possible to partially coat the roofing material 10 while stably supporting it with the backup roll 15 in a state where the roofing material 10 is projected from the end portion 12a.

Moreover, the coating roll 12, the doctor roll 14, and the backup roll 15 are tilted in the vertical direction so that the protruding side (non-painting side) of the backup roll 15 becomes higher, whereby the coating roll 12 and the doctor roll 14 are separated from each other. The coating material supplied to the coating material reservoir 13 between the coating rolls 12 has a higher roll end 12a.
Can be prevented from overflowing onto the roof material 10. Then, the higher roll end 12 where the paint does not overflow
By drawing the coating boundary line 25 on the roofing material 10 with a, the coating boundary line 25 becomes a straight line, and the coating film near the coating boundary line 25 has the same film thickness as the other portions, and the coating quality becomes uniform. The incompletely dried paint near the painting boundary line 25 does not cause blocking of the roofing materials 10 sticking to each other.

Since the paint used in this embodiment is a paint of Ford Cup No. 4 having a very low viscosity of 25 seconds or less and good fluidity, the inclination angle of the coating roll 12 is 10 Although it is set to less than °, it is preferable to ensure the fluidity of the coating by setting the inclination angle of the coating roll 12 to 10 ° or more when using a coating having a high viscosity.

Further, in this embodiment, means (doctor) for forming the paint reservoir 13 between the coating roll 12 and the coating roll 12.
Although the doctor roll 14 that rotates with the rotation of the coating roll 12 is used as the above, instead of this, a doctor bar that does not rotate is used, and by bringing this doctor bar into contact with the coating roll 12, A paint reservoir may be formed between the coating roll 12 and the coating roll 12.

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

[0024]

As is apparent from the above description, according to the method for coating a building material of the present invention, the backup roll is formed longer than the coating roll, and one side of the backup roll is projected from the coating roll. Since the coating roll and the backup roll are tilted in the vertical direction so that the protruding side of the backup roll is high, the building roll is stably supported by the backup roll in a state where one side of the building roll is projected from the end of the coating roll. It is possible to carry out partial coating while supporting, and it is possible to prevent paint from overflowing onto the building material from the end of the higher roll of the coating roll. This allows
The coating boundary line drawn at the higher end of the coating roll can be made straight, and the coating film near the coating boundary line can have the same film thickness as the other parts, thus ensuring uniform coating quality. In addition, it is possible to prevent the blocking of the building materials from sticking to each other by the incompletely dried paint near the painting boundary line.

[Brief description of drawings]

FIG. 1 is a front view of a roll coater used in an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a roll coater.

FIG. 3 is a sectional view of a coating roll.

[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, 19 ...
Frame, 21 ... Rubber layer, 22 ... Paint supply nozzle, 23
... Paint collection gutter, 24 ... Elevating means, 25 ... Painting boundary line.

Claims (1)

[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 backup roll is formed longer than the coating roll, and one side of the backup roll is projected from the coating roll. Along with tilting the coating roll, the doctor, and the backup roll in the vertical direction so that the protruding side of the backup roll is higher, while supplying the paint to the paint reservoir between the coating roll and the doctor, the coating Roll and backup With the coating material and the non-painting area of the building material are aligned with the roll end of the higher side of the coating roll, the building material is the coating roll and the backup roll. A coating method for a building material, characterized in that the coating material is partially applied to the building material by sending the coating material to the building material.