JP2717876B2 - How to remove paint film defects on wooden furniture - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for removing defects such as fine bubbles generated after priming or intermediate coating of wooden furniture or a coating surface such as fluffing.

(Prior art and problems) Conventionally, defects such as fine bubbles or fuzz on the surface of the paint film generated in the painting process of wooden furniture are removed by a method of sanding by hand using a sandpaper. There is a problem that it takes time, it is hard work, and there is an individual difference in finish, and the quality is not stable.

(Purpose) The present invention has been made in view of the above problems, and an object of the present invention is to provide a method capable of mechanically removing a defective portion on a coating film surface of wooden furniture. Things.

(Means for Solving the Problem) In order to achieve the above object, a method for removing a coating film defective portion of wooden furniture according to the present invention is to provide a method of removing fine bubbles or fluff in a coating film obtained by undercoating or intermediate coating wooden furniture and drying. It is characterized in that sand or inorganic particles having a specific gravity of 4 or less and a particle size of 0.2 to 0.5 mm are accelerated to a velocity of 15 to 40 m / sec and impinge on the defective portion.

(Operation) The present invention employs the above-described solution to uniformly blast a sand or inorganic particle onto a coating defect in a short time by using a machine to project and collide with the coating defect. It can be removed by polishing.

(Procedure leading to the invention) The inventors of the present invention have made various studies to improve the sanding paper sanding work, which is currently widely performed as a method of removing paint film defective portions of wooden furniture, and as a result, it was found that particles were removed from defective portions. It has been concluded that the defect may be removed by projecting and colliding the object at high speed. Therefore, the following experiment was conducted to confirm this idea.

(Experiment 1) After applying a pre-coating treatment to a beech wood plate, a polyurethane-based paint was primed and dried at 30 ° C ambient temperature for 1.5 hours. Table 1 shows the results of projecting and colliding particulate matter of a material by applying various accelerations by centrifugal force using a rotor.

It is important to remove only the defective portion of the coating film, and it is important that the normal coating film surface is not peeled or damaged. Needless to say, the occurrence of dents or the like on the surface of the normal coating film adversely affects the subsequent process.

Based on the above experimental results, acceleration 1
By projecting and colliding against the coating defect at a speed of 5 to 40 m / sec, fine bubbles or fuzzing parts that float up without peeling off the normal coating or causing dents Was confirmed to be removed to the same degree as sandpaper polishing.

This also confirmed that similar results were obtained with actual furniture (chairs).

(Experiment 2) From the results of Experiment 1 above, it was confirmed that the projection collision of sand particles having a low specific gravity was effective in removing the defective portion of the coating film. (Test piece, coating method, etc.) were the same as in Experiment 1, and the results of the experiment are shown in Table 2.

From the results of this experiment, it was confirmed that a sand particle having a particle size of 0.2 to 0.5 mm was effective and an acceleration having a particle size in a range of 15 to 40 m / sec was effective, and the object could be achieved.

In the above experiment, it was confirmed that when sand particles were used, it was effective for removing the coating film defective portion.However, inorganic particles such as alumina particles or mullite particles of a ceramic material having a specific gravity equivalent to the sand particles were used. Additional tests confirmed that the same effects could be obtained.

(Effects) As is clear from the above description, the present invention projects selected special granular materials having a specific gravity of 4 or less and a particle size of 0.2 to 0.5 mm to a defective portion of a coating film at an acceleration of 15 to 40 m / sec. Because it removes defective parts by colliding, it can be processed mechanically without the need for manual labor, which is heavy labor.It can be processed in a short time and the processing is uniform and stable quality is achieved. It is remarkable that various effects such as securing can be obtained.

Claims (1)

(57) [Claims] 1. An undercoat on wooden furniture which has been subjected to a pre-painting treatment.
Or, for a defective portion such as fine bubbles or fluffing of the coating film which has been coated and dried, the specific gravity is 4 or less and the particle size is 0.2 to 0.5.
A method for removing coating defects on wooden furniture, which comprises projecting and colliding sand particles or inorganic particles having a thickness of 15 mm with an acceleration of 15 to 40 m / sec.