JP3518827B2 - How to paint building materials - Google Patents

Description

Description: 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. 2. Description of the Related Art In recent years, as a roofing material for a house, there is a roofing material in which the surface of a cement-based inorganic plate is coated with good weather resistance to improve the appearance and waterproofness. However, since the weather-resistant paint used for painting this roofing material is expensive, the part of the roofing material that is applied repeatedly (that is, the part covered by other roofing material) is not painted, In many cases, only the exposed portions are applied or partial coating is applied, thereby reducing the amount of paint used and reducing costs. [0003] Conventional partial coating of roofing materials is disclosed in
As disclosed in Japanese Patent No. 90875, a curtain flow coater is used to transport a roofing material with one end of a paint curtain film flowing down from the curtain flow coater positioned at a boundary between a coating area and a non-painting area on a roofing material surface. Thus, the roofing material is partially painted. [0004] However, in the partial coating by the curtain flow coater, since the paint boundary line on the surface of the roofing material is drawn at one end of the paint curtain film, the paint boundary line is blurred by the paint curtain film. The coating may not be straight, or the coating film near the coating boundary may be thicker than other portions, and there is a disadvantage that the coating quality is not uniform as a whole. In addition, when drying after coating, the drying of the thick coating near the boundary of the paint tends to be delayed, so when the roofing material is piled up and stored, the roofing material is incompletely dried near the boundary of the paint. In some cases, a problem called so-called blocking may occur. [0005] As a coating apparatus used for coating building materials, there is a roll coater in addition to a curtain flow coater. A conventional roll coater is, for example, Japanese Utility Model No. 7-589.
As shown in Japanese Patent Publication No. 2 (1993), this is used when an object to be coated is fed between a coating roll and a backup roll to apply a coating over the entire surface of the object to be coated. In short, with a conventional roll coater, it is impossible to perform partial coating because the coating roll contacts the entire surface of the object to be coated. The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the structure of a roll coater, thereby enabling partial coating of building materials with the roll coater, and using a conventional curtain. An object of the present invention is to provide a method for coating a building material which can eliminate the drawbacks of partial coating by a flow coater. [0007] In order to achieve the above object, a coating method for building materials according to claim 1 of the present invention forms a paint reservoir between a coating roll and the coating roll. A method of partially applying paint to the building material using a roll coater having a doctor and a backup roll positioned under the coating roll and transporting the building material between the coating roll while sandwiching the building material. There, the backup roll is formed longer than the coating roll, one side of the backup roll is protruded from one end of the coating roll,
Wherein one end of the coating roll with attaching the pressing end plate to close one end of the paint reservoir by causing abutment of the closure plate to the end of the this pressing end plate doctor, and, prior to
The outer diameter of the holding end plate is calculated from the outer diameter of the coating roll.
While setting it small,
The part in contact with the soft layer on the outer circumference of the
The coating roll and the backup roll are rotated while supplying paint to a paint reservoir between the coating roll and the doctor, and forming a coating area on the building material. By sending the building material between the coating roll and the backup roll in a state in which the boundary between the and the unpainted area is aligned with one end of the coating roll on the pressing end plate side, the building material is partially It is intended to paint the paint. 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, This is impossible because the support frame of each roll is in the way.
In this case, even if the support frame etc. does not get in the way, one side of the building material also protrudes from the end of the backup roll, so the support state of the building material by the backup roll becomes unstable, and partial painting is virtually impossible It 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 painted while being stably supported by the backup roll. [0010] 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 spreads irregularly, and the paint border line is not straight, and the paint film near the paint border line is thicker than the other parts. A problem called so-called blocking occurs in which incompletely dried paint near the paint boundary line sticks. Therefore, in the present invention, one end of the paint reservoir is closed by attaching a pressing end plate to one end of the coating roll and bringing a closing plate into contact with the pressing end plate and one end of the doctor. . Thereby, the building material is partially painted while preventing the paint supplied to the paint reservoir from overflowing onto the building material. As a result, it is possible to draw a paint boundary line without overflow of the paint, so that the paint boundary line is straight and the coating film near the paint boundary line has the same thickness as the other portions. By the way, when a closing plate for closing one end of the paint reservoir is brought into direct contact with one end of the coating roll, the rotation of the coating roll causes a soft layer such as rubber or sponge on the outer periphery of the coating roll to rub against the closing plate. The coating material is worn, the sealing property is deteriorated, and the coating material leaks out of the paint reservoir onto the building material. In this respect, in the present invention, the pressing end plate is attached to one end of the coating roll, and the closing plate is brought into contact with the pressing end plate, so that the outer periphery of the coating roll is softened by friction with the closing plate. Prevents layer wear and prevents paint from leaking over building materials over time. Moreover, the presser end plate also serves to reinforce the end of the coating roll and prevent deformation of the end of the roll. Further , in the present invention, the outer diameter of the pressing end plate is set to be smaller than the outer diameter of the coating roll, and a portion of the pressing end plate which comes into contact with the soft layer on the outer periphery of the coating roll is formed on the outer periphery. The side is formed so as to be inclined toward the soft layer side. That is, at the time of painting, since the soft layer on the outer periphery of the rotating coating roll is pressed against the building material and compressively deformed, the outer diameter of the pressing end plate is set smaller than the outer diameter of the coating roll in consideration of the amount of compressive deformation. This prevents the end plate from contacting the building material. In addition, since the outer peripheral side of the soft layer of the coating roll has a tendency to shrink and deform in the roll axis direction due to a change with time, a portion of the pressing end plate that comes into contact with the soft layer is inclined toward the softer layer toward the outer peripheral side. By forming the slope, the adhesion between the end surface of the soft layer and the pressing end plate is maintained good for a long period of time, and the leakage of the paint onto the building material is prevented for a long period of time. An 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. Roll coater 11
Is a doctor roll 1 which forms a paint reservoir 13 between the coating roll 12 and the coating roll 12.
4 and a backup roll 15 that is located immediately below the coating roll 12 and conveys a building material such as a roofing material 10 between the coating roll 12 and the construction material. These rolls 12, 14, 15 are horizontally supported by a frame 19 via rotation shafts 16, 17, 18. The coating roll 12 and the backup roll 15 are driven to rotate by a chain 21 that transmits the rotation of a motor 20, and the doctor roll 14 rotates following the rotation of the coating roll 12. In this embodiment, the backup roll 15
Is formed longer than the coating roll 12, and the right side of the backup roll 15 is projected from the right end of the coating roll 12. As shown in FIG. 4, the coating roll 12 is configured by covering an outer peripheral surface of an iron core 22 fitted on the rotating shaft 16 with a rubber layer 23 (soft layer), and the rubber layer 23 is formed on the surface of the building material 10. A relatively soft rubber with a rubber hardness of 20 ° to 50 ° so that it can flexibly follow irregularities.
For example, chloroprene rubber (trade name: neoprene rubber) is used. Note that a soft layer made of an elastic foam such as sponge may be used in place of the rubber layer 23. Even in this case, any material having the above hardness can flexibly follow 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 paint rolls 13 are formed over the entire length of the coating roll 12 when the two rolls 14 and 12 come into contact with each other.
The paint is placed in the paint reservoir 13 almost above the center of the paint reservoir 13.
A paint supply nozzle 24 for supplying the inside is provided. A paint collecting gutter 26 for collecting paint overflowing from the left end of the paint reservoir 13 is provided below the left end of the coating roll 12.
(See FIG. 1). On the other hand, at the right end of the coating roll 12, a stepped disc-shaped pressing end plate 27 is attached, and as shown in FIG.
Is in close contact with the right end face of The holding end plate 27 is made of a material (for example, metal) that is hard to wear. At the time of painting, since the rubber layer 23 on the outer periphery of the coating roll 12 is pressed against the roofing material 10 and is compressed and deformed, the outer diameter of the pressing end plate 27 is set smaller than the outer diameter of the coating roll 12 in consideration of the amount of compression deformation. are doing. Further, the rubber layer 23 on the outer periphery of the coating roll 12 is liable to shrink and deform on the outer peripheral side in the roll axis direction (left-right direction) due to a change with time. The outer peripheral side is formed in a slope shape inclined toward the rubber layer 23 side. The right end of the doctor roll 14 has a circular step 2 for supporting a closing plate 30 described later.
9 are formed. A pressing plate 27 of the coating roll 12 and a closing plate 30 at the right end of the doctor roll 14 are provided.
, The closing plate 3 by the clamp mechanism 31.
0 is lightly pressed and held against the holding end plate 27 and the right end of the doctor roll 14, and the right end of the paint reservoir 13 is closed by the closing plate 30. The clamp mechanism 31 includes a handle 3
2 is rotated to the right so that the pressing projection 33 for pressing the closing plate 30 is separated rightward from the closing plate 30 to close the closing plate 3.
0 becomes a removable state. When painting, press projection 3
3 is fitted into the fitting recess 34 of the closing plate 30 (see FIG. 3) to hold the closing plate 30 so as not to be displaced. As shown in FIG. 3, the closing plate 30 has arc-shaped sliding contact portions 30a and 30b which are supported by the circular step 27a of the pressing end plate 27 and the circular step 29 of the doctor roll 14.
Is formed. Since the closing plate 30 is in sliding contact with the rotating pressing end plate 27 and the right end of the doctor roll 14, it is preferable that the closing plate 30 be formed of a material having a small frictional resistance and a low abrasion resistance. Since it is necessary to clean and replace the closing plate 30, it is preferable that the closing plate 30 is formed of a relatively light material (for example, bakelite, hard polyethylene, acrylic, wood board, etc.) so as to be easily detached. In addition, coating roll 1
Conveyor (not shown) that carries the roofing material 10 to 2
A guide 35 (see FIG. 2) for positioning the roofing material 10 is provided. As shown in FIGS. 5 and 6, the partially coated roofing material 10 has a boundary line 25 between the painted area and the unpainted area.
Extends horizontally and straight, and at the time of construction, another roofing material 10 is superimposed on the non-painting area of the roofing material 10 and attached to a roof base plate (not shown) with nails or the like. It is exposed to the outside. In the step of coating the roofing material 10, the entire surface of the roofing material 10 is previously coated with a sealer by a usual coating apparatus, and then partially coated using the roll coater 11 having the above-described configuration as follows. 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,
The coating is uniformly stretched and adhered to the entire outer peripheral surface of the rotating coating roll 12. Then, the roofing material 10 conveyed by a conveyor (not shown) is positioned by a guide 35 and the coating boundary line 25 of the roofing material 10 is moved to the right end of the coating roll 12 (the roll on the pressing end plate 27 side). While positioning the roofing material 10 on the coating roll 1
1 between the backup roll 2 and the backup roll 15, and
As shown in FIG.
2 and the coating roll 12 protruding from the right end.
Is applied to the roofing material 10 to partially coat the roofing material 10. Thus, the paint boundary line 25 is drawn straight at the right end of the coating roll 12. As described above, in this embodiment, the backup roll 15 is formed to be longer than the coating roll 12, and one side of the backup roll 15 is protruded from the coating roll 12 so that one side of the roofing material 10 is coated with the coating roll 12. In this state, the roof material 10 can be partially painted while being stably supported by the backup roll 15. In the present embodiment, the right end of the paint reservoir 13 is closed by the closing plate 30.
Can be applied to the roofing material 10 while preventing the paint supplied to the roofing material from overflowing onto the roofing material 10. Thereby, it is possible to draw the paint boundary line 25 without overflow of the paint, and the paint boundary line 25 becomes straight, and the coating film near the paint boundary line 25 becomes the same film thickness as other parts,
The coating quality becomes uniform, and the incompletely dried paint near the paint boundary line 25 does not cause blocking of the roofing materials 10 sticking to each other. When the closing plate 30 for closing one end of the paint reservoir 13 is brought into direct contact with one end of the coating roll 12, the rotation of the coating roll 12 causes the rubber layer 23 on the outer periphery of the coating roll 12 to rub against the closing plate 30. At the same time, the paint is worn, the sealing performance is reduced, and the paint leaks out of the paint reservoir 13 onto the roofing material 10. In this regard, in this embodiment, the pressing end plate 27 is attached to one end of the coating roll 12, and the closing plate 30 is brought into contact with the pressing end plate 27. Abrasion of the rubber layer 23 on the outer periphery of the coating roll 12 due to rubbing can be prevented, deterioration of sealing performance can be prevented, and leakage of paint onto the roofing material 10 can be prevented for a long time. Moreover,
Since the presser end plate 27 also serves to reinforce the end of the rubber layer 23 of the coating roll 12, it is possible to prevent the end of the rubber layer 23 from being deformed and to prevent uneven coating due to the deformation of the end of the rubber layer 23. be able to. Further, at the time of painting, the outer diameter of the pressing end plate 27 is determined in consideration of the fact that the rubber layer 23 on the outer periphery of the rotating coating roll 12 is pressed against the roofing material 10 and deformed by compression. Since it is set smaller, it is possible to prevent the holding end plate 27 from contacting the roofing material 10 and prevent the roofing material 10 from being damaged by the holding end plate 27. Moreover, the coating roll 1
In consideration of the fact that the outer peripheral rubber layer 23 is liable to contract and deform in the roll axis direction due to aging, the portion 28 of the pressing end plate 27 that comes into contact with the rubber layer 23 is closer to the outer peripheral side.
The rubber layer 23 is formed in the shape of a slope inclined to the third side.
Of the rubber layer 23 and the holding end plate 27 can be prevented from deteriorating, and the adhesion to the roofing material 10 can be prevented. Paint leakage can be prevented over a long period of time. 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. By using a non-rotating doctor bar and bringing the doctor bar into contact with the coating roll 12, a paint reservoir may be formed between the doctor bar and the coating roll 12. In addition, the present invention may be modified in various ways without departing from the gist of the invention, such as partial coating of other building materials such as exterior materials and interior materials other than roof materials as materials to be coated. Can be implemented. As is clear from the above description, according to the method for coating a building material of the first aspect of the present invention, the backup roll is formed longer than the coating roll, and one side of the backup roll is formed. As one end of the paint reservoir formed between the coating roll and the doctor was closed with a closing plate via a holding end plate while projecting from the coating roll, one side of the building material was cut off from the end of the coating roll. In the protruding state, the building material can be partially painted while being stably supported by the backup roll, and the overflow of the paint from the paint reservoir onto the building material can be prevented by the closing plate. As a result, the coating boundary line drawn on the building material can be made straight, and the coating film in the vicinity of the coating boundary line can have the same thickness as the other portions, and the coating quality can be made uniform. At the same time, incompletely dried paint near the paint boundary line can prevent blocking of building materials from sticking to each other. Furthermore, in the present invention , since the outer diameter of the holding end plate is set smaller than the outer diameter of the coating roll, it is possible to prevent the building material from being damaged by the holding end plate. In addition, since the portion of the holding end plate that comes into contact with the soft layer is formed in a slope that is inclined toward the soft layer toward the outer periphery, the adhesion between the end surface of the soft layer and the holding end plate is good over a long period of time. , And paint leakage onto the building material can be prevented for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an entire roll coater used in an embodiment of the present invention. FIG. 2 is a top view of the entire roll coater. FIG. 3 is a perspective view of a main part of the roll coater. 4: Partial cross-sectional view of a coating roll [FIG. 5] Plan view of roof material [FIG. 6] Plan view showing mounting state of roof material to roof [Explanation of reference numerals] 10: roof material (building material), 11: roll Coater, 12 ...
Coating roll, 13: paint reservoir, 14: doctor roll (doctor), 15: backup roll, 19 ...
Frame, 20 ... Motor, 23 ... Rubber layer (soft layer), 2
4: paint supply nozzle, 25: paint boundary line, 26: paint collection gutter, 27: holding end plate, 30: closing plate, 31: clamp mechanism, 35: guide.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05C 1/02 102

Claims (1)

(57) Claims 1. A coating roll, a doctor forming a paint reservoir between the coating roll, and a building located between the coating roll and the coating roll. A method of partially applying paint to the building material using a roll coater having a backup roll that conveys the material while sandwiching the material, wherein the backup roll is formed longer than the coating roll, and the backup roll is formed. One end of the coating roll is protruded from one end of the coating roll, and a pressing end plate is attached to one end of the coating roll, and a closing plate is brought into contact with the pressing end plate and one end of the doctor, thereby making the paint reservoir available. One end closed and front
The outer diameter of the holding end plate is calculated from the outer diameter of the coating roll.
While setting it small,
The part in contact with the soft layer on the outer circumference of the
The coating roll and the backup roll are rotated while supplying paint to a paint reservoir between the coating roll and the doctor, and forming a coating area on the building material. By sending the building material between the coating roll and the backup roll in a state in which the boundary between the and the unpainted area is aligned with one end of the coating roll on the pressing end plate side, the building material is partially A coating method for building materials, characterized by applying a paint.