JPH04219172A - Method for applying putty - Google Patents

Abstract

PURPOSE:To satisfactorily fill the recessed part in plywood with putty to slightly above the brims, to enable easy flattening by sanding after hardening the putty and to obtain base plywood for secondary working giving printed plywood, etc., by applying the putty by means of a specified knife coater. CONSTITUTION:When putty is applied to plywood with recessed part such as cracks and pinholes by means of a knife coater, an auxiliary tool is fitted to the underside of the body of the knife coater at a certain interval from the plywood so that the angle between the auxiliary tool and the plywood is made smaller than the angle between the body of the knife coater and the plywood.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a putty coating method for efficiently filling and coating recesses such as cracks and pinholes with the purpose of repairing the surface of plywood.

0002

[Prior Art] Plywood, especially thin plywood, is used as a base plate for secondary processing such as printed plywood and veneered plywood.
There are cracks and pinholes on the processed surface, reducing the added value of secondary processed products.

Conventionally, various methods have been studied for increasing the added value of the base plate by repairing cracks, pinholes, and other recesses in the base plate plywood. Currently, the recesses are filled and repaired. Recently, a method of applying a relatively low-viscosity putty material to the plywood surface using a knife coater to fill in the recesses has been studied. However, there is a problem of so-called "eye-skinning" due to shrinkage of the putty material when it dries after application. This is caused by the evaporation of water in the putty material, making it unsuitable for use as a base plate for secondary processing, but no satisfactory solution has yet been found.

0004

[Problem to be Solved by the Invention] To solve this problem, it is necessary to apply and fill the putty material by raising it slightly, but this depends on the feed speed of the plywood, the angle of the blade of the knife coater, and the putty material. It is known that this is caused by the viscosity of the material. The purpose of the present invention is to increase the feeding speed of the plywood, minimize the amount of putty applied on the flat parts of the plywood, swell the putty material only in the concave parts, and sand it after drying to obtain a flat plywood surface. shall be.

[0005]

[Means for Solving the Problems] The present invention is a method for applying putty material to a substrate such as wood having a concave portion using a knife coater. This is a putty material application method characterized by providing an auxiliary tool such that the angle between the auxiliary tool and the substrate is smaller than the angle between the knife coater main body and the substrate.

The present invention will be explained in detail with reference to the drawings. Figure 1
2 shows an example of a knife coater used in the present invention, in which an auxiliary tool 2 is attached to the lower surface of the knife coater main body 1, and the putty material is applied to the surface of the plywood by moving the plywood. By adjusting the height h from the surface of the plywood 4 to the lower end of the auxiliary tool and the angle θ between the knife coater body and the auxiliary tool, the amount of putty material 5 applied to the flat parts of the plywood is reduced as much as possible, and the putty material is applied only to the concave parts of the plywood. It is now possible to apply it in a raised manner.

[0007] In this knife coater, the knife coater body and the auxiliary tool only need to be in contact with each other, and the two can be fixedly attached, the auxiliary tool can be attached to slide along the knife coater body, or the auxiliary tool can be attached to the knife coater body so that the auxiliary tool can slide along the knife coater body. The knife is attached to the coater body so that its angle can be changed, or the auxiliary tool is attached to another jig and brought into contact with the knife coater body.The putty is strongly pressed against the plywood by the auxiliary tool and filled into the plywood recesses. By doing so, the intended purpose can be achieved. Among these, as mentioned above, it is preferable that the height h from the plywood surface to the lower end of the auxiliary tool and the angle θ between the knife coater body and the auxiliary tool can be adjusted.
By adjusting the height h and the angle θ, the raised state of the recess can be freely adjusted.

[0008]

[Operation] The putty material on the plywood is applied to the plywood by a knife coater, but by increasing the angle between the knife coater and the plywood, the amount of putty applied on the flat parts of the plywood can be kept small. However, in this case, there is insufficient force to press and fill the putty material into the recesses of the plywood. Therefore, in the present invention, an auxiliary tool is provided on the lower surface of the knife coater at a small angle with respect to the plywood. The putty material is pressed onto the plywood by this auxiliary tool, and the putty material is fully filled into the plywood recesses.

In the present invention, first, the putty material placed on the plywood is applied to the plywood by this auxiliary tool, but since the angle between the auxiliary tool and the plywood is relatively small, a stronger pressing force is applied by the auxiliary tool. As a result, the putty material is sufficiently compressed and filled into the plywood recesses. Next, the excess putty applied to the plywood is scraped off by the tip of the knife coater body. Immediately after passing through the knife coater, the pressing force from the knife coater is removed, so the putty material filled in the plywood recesses bulges due to the repulsive force against the pressing force and the elasticity of the plywood. If the putty material rises and fills into the recesses of the plywood, the bulge will remain even if the putty material dries and becomes slightly thinner.
By sanding, it is possible to obtain a completely flat plywood.

[0010] The angle between the knife coater body and the plywood depends on the solid content and viscosity of the putty material, but is usually 20 to 50 degrees.
degree. In the present invention, the angle between the auxiliary tool and the plywood is
Similarly, it varies depending on the solid content and viscosity of the putty material, but 0 to 20
The degree is appropriate, preferably 5 to 15 degrees. The appropriate distance between the auxiliary tool and the plywood is 2 to 10 mm.

[0011]

[Example] A putty material was applied using a knife coater to a plywood board with cracks, pinholes, and other recesses on the surface. The angle between the knife coater body and the plywood is approximately 30 degrees. An auxiliary tool was attached to the lower surface of the knife coater body at a height of 5 mm from the plywood. The angle between the auxiliary tool and the plywood is 10 degrees. A putty material having a solid content of 85% and a viscosity of about 250 poise was applied at a coating speed of 30 m/min. After applying the putty material, the plywood filled the recesses and swelled up. Almost no coating was applied to the flat areas. On the other hand, when the coating was applied without an auxiliary tool attached, the entire surface of the plywood, including the recesses filled with putty material, was almost flat. These plywood boards were heated at 80° C. for 5 minutes and then aged for one day. The plywood coated with a knife coater equipped with an auxiliary tool had some raised concavities, which could be easily flattened by sanding. On the other hand, when the plywood was coated with a knife coater without an auxiliary tool, the putty material in the recesses dried and became slightly thinner, causing dents.

0012

[Effects of the Invention] In the method of the present invention, putty can be applied to plywood with recesses in such a way that a bulge is generated in the recesses, so sanding after hardening of the putty can be carried out successfully. I can do it. Various plywood or putty materials can be used by appropriately selecting the mounting position and angle of the auxiliary tool. Therefore, the plywood obtained by the method of the present invention is suitable for secondary processing.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial perspective view of an example of a knife coater used in the present invention.

FIG. 2 is a schematic cross-sectional view of FIG. 1;

[Explanation of symbols]

1 Knife coater body 2 Auxiliary equipment 4 Plywood 5 Putty material

Claims (1)

[Claims] Claim 1: In a method of applying putty material to a substrate such as wood having recesses using a knife coater, an auxiliary tool is placed on the lower surface of the knife coater main body at a certain distance from the substrate. A method for applying a putty material, characterized in that the angle between the knife coater and the substrate is smaller than the angle between the main body of the knife coater and the substrate.