JPS5857988B2 - How to level out the convex parts of an uneven paint film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method of pressing down the convex portions of an uneven coating film formed on the surface of an object to be coated to an appropriate height while the coating film is not yet cured to form a smooth and flat surface. Regarding improvements.

In recent years, in the field of building materials, the finished appearance of both interior and exterior uses has gradually changed from the conventional flat finish to a textured three-dimensional pattern.

Such uneven patterns are sometimes applied at construction sites, but in recent years, from the standpoint of mass production, the method has become more common to produce decorative boards in factories and then incorporate them on site. ing.

To form an uneven three-dimensional pattern on a substrate, it is often done by spraying the coating material in scattered dots, but if this is done, the height of the convex parts of the coating film will be uneven, which is undesirable, so the convex parts are generally The convex portion is pressed down to a certain height to form a flat portion.

At this time, the convex portions of the uneven coating film are flattened by pressing down with a roller while the coating film is not cured.

Conventionally, a hard plastic roller has been used as this roller.

If the roller surface is dry, the spray coating material will adhere to the roller surface, so to prevent this, the roller surface is soaked with a release agent liquid such as water or an appropriate solvent (a poorly water-soluble solvent such as turpentine). Pressing is done at the top.

However, with this method, it is difficult to uniformly supply the release agent liquid to the roller surface, and therefore, if the release agent liquid is insufficient during the presser foot break-in, the coating material often adheres to the roller. On the other hand, if the release agent liquid is in excess, the release agent will wrap around under the coating material that is being pressed and spread, and the coated surface will harden with the release agent engulfed, causing problems in terms of strength.

Furthermore, when smoothing is performed using such a roller, the pushing force of the roller is directly applied to the surface of the coating material, so that the smoothed coating film may be rolled up.

Therefore, it was considered to use a hard and porous roller.

This method is superior to the above method in that it retains the release agent liquid well and partially relieves the pressure of the roller when leveling the coating film.

However, in this method, since the roller surface has many holes, unevenness occurs on the painted surface of the pressed convex parts, and as the roller is used many times, the coating material gets into the holes and gradually hardens, causing the holes to become clogged. In the end, this method exhibits the same drawbacks as the conventional method described above.

This is particularly noticeable when the degree of curing of the coating material is low.

If the presser foot is leveled when the spray coating material has sufficiently hardened, wrinkles may appear on the leveled surface of the presser foot, and the edges of the flattened coating may harden without adhering to the surface of the substrate to be coated. It is not preferable to do so, but it is preferable to carry out pressing and rinsing at an early stage when the degree of hardening of the spray coating material is low.

Particularly in the case of factory production, this is also required from the viewpoint of time reduction.

In view of the above-mentioned current situation, the present invention provides a method for properly leveling the coating even when the degree of curing of the coating film is low. A roller device consisting of a hard porous roller body, and a porous sheet fitted around the outer circumference of the roller body, which is resistant to liquid leakage and has a large number of pores smaller than the pores of the roller body; or (11) ) A hard porous roller body sufficiently impregnated with a release agent liquid, and endless pores that can run under the roller body, are resistant to leakage of liquid, and have many pores smaller than the pores of the roller body. The present invention is characterized in that the convex portions of the uncured uneven coating film formed on the surface of the object to be coated are smoothed by a roller device consisting of a textured sheet.

The object to be coated used in the present invention is not particularly limited, and examples thereof include commonly used construction materials such as plywood and steel plates.

In addition, examples of the spraying materials for forming convex portions on the object to be coated include spraying materials C (using cement-based binder), E (using synthetic resin emulsion-based binder), etc. specified in JIS-A6910; RE (uses a reaction-curing synthetic resin emulsion-based binder) and R8 (uses a reaction-curable synthetic resin solution-based binder), or two of C, E, and RE.
Examples include a mixed composition of more than one species.

The material of the hard porous roller body used in the present invention may be any material as long as it has an appropriate load to flatten the convex portions of the coating film and has an appropriate ability to retain the release agent liquid, such as Examples include volcanic rock, artificial grindstones such as vitrified grindstones and resinoid grindstones, bisque ceramics, and porous sintered metals.

Further, examples of the porous sheet used in the present invention include woven fabrics, nonwoven fabrics, and saran nets made of natural fibers such as cotton, wool, and silk, and synthetic fibers such as rayon, polyester, and acrylic.

It is preferable to use synthetic fibers because they are less likely to leak into liquids.

The pores in the sheet need to be smaller than the pores in the roller body, and the finer the better.

However, it is necessary to have appropriate wear resistance and chemical resistance.

The present invention will be explained below with reference to the drawings.

FIGS. 1 and 3 are perspective views showing the implementation state of the method of the present invention, and FIGS. 2 and 4 are cross-sectional views showing the leveling state of the coating film in the method of FIGS. 1 and 3, respectively. It is a diagram.

The object to be coated 1 moves on the conveyor device 2 in the direction of the arrow.

The spray coating material 3 forms convex portions on the surface of the object 10 to be coated.

In the method shown in FIG. 1, a roller device 4 is mounted on the conveyor device 2 and rotates about a direction perpendicular to the conveying direction.
This roller device has a hard porous roller main body 5 in the center, and a porous sheet 6 is stretched around the outer periphery of the main body 5.

The roller device 4 rotates in the direction of the arrow at the contact portion with the object 1 to be coated so as to travel in the same direction and at the same speed as the conveying direction of the conveyor device 2.

This rotation can be achieved by driving and rotating the shaft 7 with a motor.

In the method shown in FIG. 3, a roller device 4' is provided on the conveyor device 2, and this roller device includes a roller main body 5' that rotates with an axis perpendicular to the conveying direction of the conveyor device 2, and An endless porous sheet 6' runs under the roller main body 5' in synchronization with the rotation of the roller body 5'.
It consists of

The endless porous sheet 6' is supported at its upper part by rollers 8 as appropriate.

The sheet C may be driven and run in the direction of the arrow by a motor connected to one of the rollers 8, and the roller main body 5' may be rotated in the direction of the arrow as the sheet 6' runs. , the shaft 7' may be driven and rotated independently by a motor.

In any case, the roller main body 5' and the sheet 6' are made to travel in the same direction and at the same speed as the conveying direction of the conveyor device at the contact portion with the object to be coated.

Figures 2 and 4 show the changes in the coating film when the convex parts of the uneven coating film are pressed down using the roller devices 4 and 4' as described above. Section 9 is formed.

According to the method of the present invention as described above, the release agent liquid can be held in the hard porous roller body, and it can be uniformly supplied to the surface of the object to be coated during breaking-in, and the pressing force of the roller can be moderated as appropriate. This allows the presser foot to be used properly.

Furthermore, in the method of the present invention, the porous roller body does not come into direct contact with the coating surface, and there is a porous sheet interposed that does not easily leak against the liquid and only allows the liquid to seep out. Or, good pressing is performed without adhesion to the sheet.

In addition, since the holes in the sheet are sufficiently fine, the convex portions of the coated film are smooth and flat.

In addition, a mechanism for supplying the release agent liquid to the roller body,
It goes without saying that a mechanism for cleaning the sheet when dust or coating material adheres to the surface of the sheet and a mechanism for adjusting the load of the roller device applied to the surface of the object to be coated may be provided.

Furthermore, the sheet surface is not only a flat surface, but also a material with a linear pattern or a regular uneven pattern can be used to add a desired pattern to the presser foot flattening surface, thereby improving the design effect of the product. You can also do it.

[Brief explanation of the drawing]

FIGS. 1 and 3 are perspective views showing the implementation state of the method of the present invention, and FIGS. 2 and 4 are cross-sectional views showing the leveling state of the coating film in the method of FIGS. 1 and 3, respectively. It is a diagram. 1: Object to be coated, 2: Conveyor device, 3: Coating material, 4.4'
: Roller device, 5, 5': Hard porous roller main body,
6,6': Porous sheet.

Claims (1)

[Scope of Claims] 1. The convex portions of an uncured uneven coating film formed on the surface of a flat plate-shaped object to be transferred placed on a conveyor device are In a method of pressing and leveling using a roller device that runs in the same direction and at the same speed as the transfer direction of the coated material, the method comprises: (1) a hard porous roller body sufficiently impregnated with a release agent liquid; and an outer peripheral portion of the roller body. or (11) a hard porous roller sufficiently impregnated with a release agent liquid; A roller device consisting of a main body and an endless porous sheet that can run under the roller main body, is resistant to liquid leakage, and has many pores smaller than the pores of the roller main body, presses the surface of the object to be coated. A method for pressing and leveling convex portions of an uneven coating film, which is characterized by leveling.