JP2002126594A - Method for partial coating of building material and roll coater for coating the material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for the partial coating of a building material using a roll coater which is applicable to the partial coating in which the borderline between the coated area and uncoated area of the building material can become a straight line and a whole coating film has an equal thickness and which can be used for a long time and can be cleaned easily. SOLUTION: The peripheral surface of a coating roll 10 is formed with an elastic soft layer 14, and a doctor roll 20 has a disk blade 22 which protrudes from the peripheral surface of the doctor roll 20 to be pressed into the soft layer 14. The tip fringe of the blade 22 is pressed into the coating roll 10 to close one end of a coating bank 11. While a coating material is supplied to the bank 11, the coating roll 10 and a backup roll 30 are rotated, and with the blade 22 positioned on the borderline between the coated area 41 and uncoated area of the building material 40, the building material is fed between the coating roll 10 and the backup roll 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially coating building materials and a roll coater used for the coating.

[0002]

2. Description of the Related Art In recent years, as a roof material for a house, a material in which a sealer is applied to the surface of a cement-based inorganic plate and then a finish coating having good weather resistance is applied to improve appearance and waterproofness has been used. I have. However, the weather-resistant paint used for the finish painting of this roofing material is expensive,
The undercoat of the waterproof top sealer is applied to the entire surface of the roofing material, but the part of the roofing material that is applied repeatedly, that is, the part that is covered and covered by other roofing material, is painted only the exposed part without finishing painting, so-called Applying partial coating often reduces the amount of paint used and cuts costs.

As a method of applying a partial coating to a roofing material, Japanese Patent Application Laid-Open No. 4-190875 discloses the use of a curtain flow coater. This is because the roof material is partially painted by transporting the roof material by positioning one end of the paint curtain film flowing down from the curtain flow coater on the boundary between the coating area and the non-painting area on the roof material surface I have.

[0004] In the partial coating by the curtain flow coater, the paint boundary line on the surface of the roofing material is drawn at one end of the paint curtain film. There is a disadvantage that the coating film may be thicker than other parts, and the coating quality is not uniform as a whole. Moreover, when drying after painting, the drying of the thick coating near the paint boundary line tends to be delayed, so when stacking and storing roofing materials,
A problem called so-called blocking may occur in which roof materials adhere to each other with incompletely dried paint near the paint boundary line.

As a coating apparatus used for coating building materials, there is a roll coater in addition to a curtain flow coater.
However, when applying partial coating with a roll coater,
It is necessary to take some measures to prevent the paint remaining during application between the coating roll and the doctor roll from leaking from the roll end and adhering to the unpainted area of the building material.

As a means for achieving this, Japanese Patent Publication No. 62-58
Japanese Patent Application Laid-Open No. 790 discloses a liquid stopping plate provided on both sides of a coating roll and a doctor roll to form a liquid reservoir between the two rolls, and an edge of each contacting portion of the liquid stopping plate with both rolls. It is described that the liquid scraping surface formed in the above is inclined upward toward the liquid reservoir between the two rolls as it goes upward, and a space is provided between the liquid scraping surface and the outer peripheral edges of the two rolls. . However, what is described here is only a means for preventing paint from leaking, and does not describe applying partial coating to building materials.

[0007] Japanese Patent Application Laid-Open No. 9-290189 describes a method of applying a partial coating to a building material using a roll coater. FIGS. 6, 7, and 8 illustrate the above-mentioned Japanese Patent Application Laid-Open No. 9-290.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view, a plan view, and a perspective view of a roll coater coating machine described in JP-A-189-189. This roll coater coating machine includes a coating roll 10 and a doctor roll 2 which forms a paint reservoir 11 between the coating roll 10 and the coating roll 10.
0, and a backup roll 30 that is located immediately below the coating roll 10 and transports the building material 40 while sandwiching the building material 40 between the coating roll 10. Each of these rolls 10, 20, 30 has a rotating shaft 1
It is horizontally supported by the frame 51 via 2, 21 and 31. The coating roll 10 and the backup roll 30 are driven to rotate by a chain 53 that transmits the rotation of a motor 52, and the doctor roll 20 rotates following the rotation of the coating roll 10.

The coating roll 10 and the doctor roll 20 have substantially the same axial length, and both the rolls 10 and
The paint reservoir 11 is formed in the vicinity of the contact portion by the contact of 20. A paint supply nozzle 54 is provided substantially above the center of the paint reservoir 11. Below the left end of the coating roll 10, a paint collecting gutter 55 for collecting paint overflowing from the left end of the paint reservoir 11 is provided. A guide 56 for adjusting the position of the end of the building material 40 is provided on a conveyor (not shown) for carrying the building material 40 into the coating roll 10.

Then, a presser end plate 14 is attached to the right end of the coating roll 10, and the closing plate 60 is brought into contact with the presser end plate 14 and the right end of the doctor roll 20. While preventing overflow, the right end of the coating roll 10 is
Only the coating area 41 of the building material 40 is coated by adjusting the position of the boundary line 43 between the coating area 41 and the non-painting area 42.

[0010]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-290 is disclosed.
In the partial coating method disclosed in Japanese Patent No. 189, the friction due to the rubbing between the end portions of the holding end plate 14 and the doctor roll 20 and the closing plate 60 is inevitable, and a gap is easily generated between the holding end plate 14 and the closing plate 60. The coating roll is liable to be hardened and adhered on the side surface of the coating roll 10 which is in contact with the closing plate 60 due to the influence of frictional heat caused by the friction between the coating rolls and the coating rolls. In the case where the amount of the deposit gradually increases, a gap is formed between the holding end plate 14 and the closing plate 60, and in any case, the paint leaks from this gap, and It may happen that the surface of the coating 40 is soiled, or that the paint boundary line 43 is not straight.

If an oil-based solvent type paint is used as the paint type, the danger of ignition of the paint due to the frictional heat may be involved. Therefore, the oil-based solvent type paint cannot be used, and the types of paints that can be used are limited. Had been. In addition, unless the closure plate 60 was removed each time after use, it was difficult to clean the doctor roll 20 and the portion between the coating roll 10 and the closure plate 60.

The present invention has been made in view of such circumstances, and the boundary between a painted area and a non-painted area of a building material is straight, and the entire painted surface is uniform with the same film thickness. To provide a roll coater coating machine that can be subjected to partial coating, can withstand long-time use, does not require much cleaning, and a method of partially coating building materials using the roll coater coating machine. And

[0013]

According to the present invention, there is provided a method for partially coating a building material, comprising: a coating roll; a doctor roll for forming a paint reservoir between the coating roll; And a backup roll that is located below the roll and conveys the building material while sandwiching the building material between the coating roll and a coating roll. Consists of a soft layer having elasticity, the doctor roll is provided with a disk blade protruding from the outer peripheral surface of the doctor roll and pressed into the soft layer, thereby closing one end of the paint reservoir,
By supplying the paint to the paint reservoir and rotating the coating roll and the backup roll while feeding the building material between the coating roll and the backup roll, the building material is partially painted. Is performed.

[0014] In the partial coating method for building materials according to the present invention,
As the leading edge of the disk blade is pressed into the soft layer on the outer peripheral surface of the coating roll, the outer edge region of the disk blade bites into the outer peripheral surface of the coating roll and is pressed down from both the left and right directions. While the paint is being wiped off, one end of the paint reservoir is securely closed by the disk blade. Thereby, the coating boundary line of the building material is formed in a straight line, and a coating excellent in appearance can be applied.

Further, the coating film near the coating boundary line has the same thickness as the other portions, so that the entire coated surface can be uniformly coated, and the building materials are fixed with the incompletely dried coating near the coating boundary line, thereby blocking the building materials. The occurrence of the phenomenon can be avoided. Preferably, the roll coater coating machine includes a guide for fixing a position of the conveyed building material in the axial direction of the coating roll, and the building material has an end portion of the building material aligned with the guide. In this state, it is fed between the coating roll and the backup roll.

Preferably, one or more washers having an outer peripheral surface which is the same as the outer peripheral surface of the doctor roll are attached to the doctor roll adjacent to the disk blade. In this case, by changing the number of the washers to be attached, the axial position of the disk blade can be changed. Preferably, the doctor roll itself can be moved in the axial direction, whereby the axial position of the disk blade can also be changed.

By making it possible to change the axial position of the disk blade in this way, it is possible to adjust the position where the boundary between the painted area and the non-painted area of the building material is drawn. In addition, if the portion where the outer edge region of the disc blade is pressed into the soft layer on the outer peripheral surface of the coating roll is deteriorated due to long-term use, by changing the position of the disc blade, the soft layer is not deteriorated. The disk blade can be press-fitted. As a result, the outer edge region of the disk blade and the soft layer can maintain a good adhesion state again, and it is possible to continuously perform good partial coating. In this case, by moving the guide by a distance corresponding to the distance the disc blade has moved,
It is possible to maintain the same position where the painted boundary line of the building material is drawn.

[0018] Preferably, the soft layer on the outer peripheral surface of the coating roll is formed of rubber or sponge. Thereby, a soft layer having good elasticity can be obtained, and when the leading edge of the disc blade is pressed into the outer peripheral surface of the coating roll,
The outer edge region of the disk blade is closely attached to the outer peripheral surface of the coating roll in a biting manner, so that it is possible to reliably prevent the paint from leaking.

In the coating method according to the present invention, the outer edge region of the disk blade is constantly pressed into the coating roll and bites into the coating blade, so that the dirt on the disk blade is wiped off by the coating roll, and the disk blade is hardly stained with paint. That is, there is no need to remove the closing plate every time it is washed as in the partial coating method described in JP-A-9-290189 described as a conventional example.

Further, the coating method according to the present invention does not generate frictional heat due to the friction between the holding end plate and the closing plate unlike the partial coating method disclosed in Japanese Patent Application Laid-Open No. 9-290189. Paints can be used, and the range of paint choices is expanded. The present invention also discloses a roll coater coating machine used in the above method for partial coating of building materials.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG.
FIG. 3 is a front view and a plan view showing an embodiment of the roll coater according to the present invention, and FIG. 3 is a perspective view showing a main part of the roll coater in FIGS. FIG. 4 is a front view showing an embodiment of a doctor roll in a partial cross section.

As shown in FIG. 1, a roll coater 1 according to the present embodiment has a coating roll 10 similar to the roll coater shown in FIG.
A doctor roll 20 that forms a paint reservoir 11 between the coating roll 10 and a backup roll 30 that is located immediately below the coating roll 10 and transports a building material between the coating roll 10 and the building material. Is provided.

The coating roll 10 is constituted by covering an outer peripheral surface of an iron core 13 fitted on a rotating shaft 12 with a rubber layer (soft layer) 14. The rubber layer 14 has a rubber hardness of 20 ° to 5 ° so that it can flexibly follow irregularities on the surface of the building material.
A relatively soft rubber at 0 °, such as chloroprene rubber, is preferably used. Instead of the rubber layer 14, a soft layer made of an elastic foam such as a sponge may be used.

In the present embodiment, the doctor roll 20 is disposed before the coating roll 10 when viewed in the direction in which the building material is carried in. However, as in the roll coater coating machine shown in FIG. Roll 20 may follow coating roll 10. In addition, the same parts as those of the roll coater shown in FIG. FIG.
As in the description of the roll coater coating machine shown in FIG. 1, also in the roll coater coating machine of the present embodiment, the following description will be made with the side on which the paint collection gutter 55 and the guide 56 are installed on the left side.

In the illustrated example, the building material to be partially painted is a flat roofing material 40 as shown in FIG. 5, and a painting boundary line 43 between a painting area 41 and a non-painting area 42 extends in a straight line. At the time of construction, another roofing material 40 is superimposed on the non-painting area 42 of the roofing material 40, and only the painting area 41 is exposed to the outside. It goes without saying that the building material to be partially painted is not limited to this.

In order to partially coat the roofing material 40, the roll coater 1 of the present embodiment has the following new configuration as compared with the conventional roll coater shown in FIG. That is, as described later, the doctor roll 20
Is provided with a disk blade 22 protruding from the outer peripheral surface of the doctor roll 20 and being pressed into the rubber layer 14 of the coating roll 10, whereby one end of the paint reservoir 11 is closed at the position of the disk blade 22.

That is, as shown in the figure, a doctor blade 20 is provided with a disk blade 22 having a diameter larger than the diameter of the doctor roll 20 at a predetermined position on the right end side.
Are mounted coaxially with the doctor roll 20 by bolts 23 with the outer peripheral edge protruding from the outer peripheral surface of the doctor roll 20. Although not essential, in the illustrated example, the end face of the doctor roll 20 and the disk blade 2
2, a plurality of washers 24 whose outer peripheral surfaces are the same as the outer peripheral surface of the doctor roll 20 are arranged. In the axial direction of the disk blade 22 can be changed.
If a large number of washers 24 having different axial widths are prepared, the mounting position of the disk blade 22 can be more finely adjusted by mounting them in combination.

As described above, the disc blade 22 is pressed so that the leading edge of the disc blade 22 is pressed into the rubber layer 14 of the coating roll 10 and the paint reservoir 11 is securely closed.
Project from the outer peripheral surface of the doctor roll 20 by a predetermined distance, for example, about 1 cm. The rubber layer 14 on the outer peripheral surface of the coating roll 10 has elasticity. When the outer edge region of the disc blade 22 is pressed into the outer peripheral surface of the coating roll 10 by press-fitting, the two adhere to each other, and the right end of the paint reservoir 11 is closed. It can be closed securely to prevent paint leakage.

If the portion of the rubber layer 14 of the coating roll 10 into which the disk blade 22 is pressed is deteriorated due to long-term use, the number of washers 24 attached adjacent to the disk blade 22 is changed. The mounting position of the disk blade 22 is moved in the axial direction. As a result, the outer edge region (tip edge) of the disk blade 22 and the rubber layer 14 can maintain good adhesion again. In this case, the guide 56 is also moved according to the distance that the disk blade 22 has moved so that the position where the paint boundary line of the building material is drawn does not change.

As shown in FIG. 2, the length d of the coating roll 10 is slightly longer than the width h of the coating area 41 of the roofing material 40, whereas the length d of the backup roll 3 is small.
The length D of 0 is longer than the width H of the roofing material 40 so that the roofing material 40 can be supported in a stable state. Therefore,
The right side of the backup roll 30 is the coating roll 1
0 protrudes from the right end.

When coating the roofing material 40, the entire surface of the roofing material 40 is preliminarily coated with a sealer using a usual coating apparatus. Thereafter, partial coating is performed as follows using the roll coater coating machine 1 having the above configuration. First, the paint is supplied from the paint supply nozzle 54 to the paint reservoir 11 between the coating roll 10 and the doctor roll 20 while the coating roll 10 and the backup roll 30 are rotated by the motor 52. The paint flows in the paint reservoir 11 in the left-right direction, and is evenly spread and adheres to the entire outer peripheral surface of the rotating coating roll 10.

Then, the end of the roofing material 40 conveyed by the conveyor (not shown) on the side of the coating area 41 is adjusted to the position of the guide 56, and the coating boundary 43 of the roofing material 40 is accurately positioned. Doctor Roll 20 as drawn on
The position of the disk blade 22 is adjusted, the roofing material 40 is fed between the coating roll 10 and the backup roll 30, and the roofing material 40 is partially painted. Thereby, the paint boundary line 43 is adjusted in accordance with the position of the disc blade 22.
Is drawn in a straight line.

As described above, since the right end of the paint reservoir 11 is closed by the disk blade 22, the paint supplied to the paint reservoir 11 is prevented from overflowing onto the roof material 40, and the roof material 40 is partially coated. Can be applied. As a result, the coating boundary line 43 becomes straight, and the coating film near the coating boundary line 43 has the same thickness as the other portions, so that the entire coated surface can be uniformly coated. The coating material does not cause a blocking phenomenon in which the roofing materials 40 are fixed to each other.

Further, since the outer edge region of the disk blade 22 is continuously pressed into the rubber layer 14 on the outer peripheral surface of the coating roll 10, dirt on the disk blade 22 is wiped off by the coating roll 10, and the disk blade 22 is removed. Is hard to get paint stains. That is,
Unlike the roll coater in FIG. 6 described as a conventional example, there is no need to remove the closing plate 60 every time it is washed.

As an alternative means or an additional means for making the disk blade 22 movable in the axial direction, although not shown, the doctor roll 20 may be made movable in the axial direction by an appropriate means. Doctor Roll 20
Is moved in the axial direction to change the position of the disk blade 22, thereby adjusting the position where the paint boundary line 43 of the roofing material 40 is drawn. In this embodiment, a roof material is used as an example of a material to be coated. However, the partial coating method of a building material according to the present invention is used for various building materials such as an exterior material and an interior material in addition to the roof material. be able to.

[0036]

According to the method for partially coating a building material according to the present invention and the roll coater coating machine used for the coating, the boundary between the coating area and the non-coating area of the building material becomes straight, and the entire coated surface is formed. Partial coating can be easily and reliably applied so as to be uniform with the same film thickness. In addition, the roll coater coating machine according to the present invention can withstand long-term use, and does not require labor for maintenance of the apparatus.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a roll coater coating machine according to the present invention.

FIG. 2 is a plan view of the roll coater shown in FIG.

FIG. 3 is a perspective view showing a main part of the roll coater coating machine shown in FIG.

FIG. 4 is a front view, partially in section, of an embodiment of a doctor roll used in the roll coater shown in FIG. 1;

FIG. 5 is a plan view showing a roof material to be partially painted.

FIG. 6 is a front view showing a conventional roll coater coating machine.

FIG. 7 is a plan view of the roll coater coating machine shown in FIG.

FIG. 8 is a perspective view showing a part of the roll coater shown in FIG. 6;

[Brief description of reference numerals]

1 ... roll coater coating machine, 10 ... coating roll,
11 paint reservoir, 14 soft layer, 20 doctor roll,
22: disk blade, 30: backup roll, 40
... building materials, 41 ... painted area, 42 ... unpainted area, 43 ...
Paint border

Continued on front page F-term (reference) 4D075 AC21 AC29 AC30 AC34 AC84 AC86 AC93 CA47 DA06 DB21 DC02 EA05 4F040 AA02 AB04 AC01 BA12 CB02 CB03 CB05 CB36 4F042 AA02 BA08

Claims (10)

[Claims] 1. A coating roll, a doctor roll that forms a paint reservoir between the coating roll, and a backup roll that is located below the coating roll and transports a building material between the coating roll and the building material. A partial coating method for building materials using a roll coater coating machine comprising: an outer peripheral surface of the coating roll is formed of a soft layer having elasticity, and the doctor roll projects from the outer peripheral surface of the doctor roll. By providing a disk blade that is pressed into the soft layer, one end of the paint reservoir is closed, and while supplying paint to the paint reservoir, the coating roll and the backup roll are rotated to rotate the building material. By feeding between the coating roll and the backup roll, a part is Part coating method of building material characterized by applying to coating. 2. The roll coater coating machine includes a guide for fixing a position of the conveyed building material in an axial direction of the coating roll, wherein the building material is
The method according to claim 1, wherein the building material is fed between the coating roll and the backup roll with an end of the building material aligned with the guide. 3. The at least one washer having an outer peripheral surface having the same peripheral surface as the outer peripheral surface of the doctor roll is attached to the doctor roll adjacent to the disk blade, and the washer is attached. The building according to claim 2, wherein by changing the number, the axial position of the disk blade is changed, thereby adjusting the position where the boundary between the painted area and the unpainted area of the building material is drawn. How to partially paint the material. 4. The building material according to claim 2, wherein the doctor roll is moved in an axial direction to adjust a position where a boundary between a painted area and a non-painted area of the building material is drawn. Partial painting method. 5. The method according to claim 1, wherein the soft layer on the outer peripheral surface of the coating roll is made of rubber or sponge. 6. A coating roll, a doctor roll that forms a paint reservoir between the coating roll, and a backup roll that is positioned below the coating roll and transports a building material between the coating roll and the coating material. A coating blade provided with an outer peripheral surface of the coating roll formed of a soft layer having elasticity, wherein the doctor roll projects from the outer peripheral surface of the doctor roll and is press-fitted into the soft layer. A roll coater coating machine comprising: 7. The roll coater coating machine according to claim 6, further comprising a guide for fixing a position of the conveyed building material in an axial direction of the coating roll. 8. The doctor roll is characterized in that one or more washers having an outer peripheral surface having the same peripheral surface as the outer peripheral surface of the doctor roll can be attached adjacent to the disk blade. The roll coater coating machine according to claim 7, wherein 9. The roll coater coating machine according to claim 7, wherein said doctor roll is movable in an axial direction. 10. The roll coater according to claim 6, wherein the soft layer on the outer peripheral surface of the coating roll is made of rubber or sponge.