CN107262340B

CN107262340B - Method for improving electrostatic coating efficiency of artificial board

Info

Publication number: CN107262340B
Application number: CN201710604117.4A
Authority: CN
Inventors: 吴天延; 罗扬; 庄联森; 熊南方; 刘杰玉; 张晓龙; 吴有灿
Original assignee: Yichang Jinbao Music Instrument Manufacture Co ltd
Current assignee: Yichang Jinbao Music Instrument Manufacture Co ltd
Priority date: 2017-07-24
Filing date: 2017-07-24
Publication date: 2020-12-01
Anticipated expiration: 2037-07-24
Also published as: CN107262340A

Abstract

The invention discloses a method for improving the electrostatic coating efficiency of an artificial plate, which comprises the steps of arranging a metal layer on the back of the artificial plate to be coated, enabling the metal layer to be in contact with the metal layer, and grounding the metal layer; and finally performing electrostatic coating. Furthermore, the metal layer is an aluminum sheet. According to the invention, the metal layer is arranged on the back surface of the artificial board to be coated, and as the metal contains more free electrons, charges can rapidly flow to the ground on the metal sheet, so that the deposition amount of the charges of the attached coating is reduced, the repulsion action on the unadhered charged paint mist is reduced, and the film thickness is improved. The charge which flows away quickly can also better ensure that the charge distribution of the whole coated object is in a relatively close state, which is beneficial to the average dispersion of paint mist adsorption, thereby ensuring that the film thickness has certain uniformity.

Description

Method for improving electrostatic coating efficiency of artificial board

Technical Field

The invention belongs to the technical field of electrostatic coating, and particularly relates to a method for improving the electrostatic coating efficiency of an artificial plate.

Background

Electrostatic painting of wood parts is a painting technique that has been gradually developed in the last decade, and has been gradually popularized in the painting fields of furniture, musical instruments and the like. But electrostatic painting of piano parts is different from electrostatic painting of common wood products, and the final film thickness of the piano parts needs to reach 0.6-0.8 mm to meet the requirements of subsequent grinding and polishing, so that the final products form mirror surface appearances. The coating thickness of common furniture wooden products is usually about 0.1-0.2 mm, and the electrostatic coating of piano parts needs to reach the film thickness about 4 times of that of the conventional wooden products. As the thickness of the paint film is thicker, the charge of the paint adsorbed on the spraying part of the wood product is more difficult to transfer to the ground, particularly for the artificial wood material without natural water-containing channels of the solid wood material, and the aim of electrostatic thick coating in one pass is more difficult to achieve.

Disclosure of Invention

The invention aims to provide a method for improving the electrostatic coating efficiency of an artificial plate, which can improve the adsorption efficiency of the artificial plate which is not suitable for adsorbing electrostatic coatings, does not need to spray conductive primer, reduces coating waste and reduces environmental pollution.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for improving the electrostatic coating efficiency of an artificial board comprises the steps of arranging a metal layer on the back of the artificial board to be coated, enabling the metal layer to be in contact with the metal layer, and grounding the metal layer; and finally performing electrostatic coating.

Furthermore, the metal layer is an aluminum sheet. The material is selected according to the metal electric conductivity meter, the electric conductivity efficiency of gold and copper is higher than that of aluminum, but the price is higher, aluminum is preferably used as a test material, aluminum is not easy to rust relative to iron, and soft aluminum skin can be selected to be easily fixed by an inflating nail.

Furthermore, the upper part of the metal layer is connected with the upper part of the artificial board to be coated, and the sizes of the bottom and two sides of the metal layer are smaller than the sizes of the corresponding positions of the artificial board to be coated.

Further, the bottom and the edges of both sides of the metal layer are 20mm from the edge of the artificial board to be coated.

Furthermore, the metal layer comprises a hard metal layer at the lower part and a soft metal layer at the upper part, the hard metal layer is detachably connected with the soft metal layer, and the soft metal layer is connected with the upper part of the artificial board to be coated.

Furthermore, the top of the soft metal layer is bent to be tightly attached to the top of the artificial board to be coated and then fixed by an air nail; the hard metal layer and the soft metal layer are adhered through color separation paper.

Furthermore, the metal layer is positioned between the two artificial boards to be coated and clamped through the back surfaces of the two artificial boards to be coated.

Further, the thickness of the metal layer is 1 mm.

Further, the artificial board is a medium density fiberboard.

The invention also relates to the use of the coated artificial board obtained by the method in piano parts.

According to the invention, the metal layer is arranged on the back surface of the artificial board to be coated, and as the metal contains more free electrons, charges can rapidly flow to the ground on the metal sheet, so that the deposition amount of the charges of the attached coating is reduced, the repulsion action on the unadhered charged paint mist is reduced, and the film thickness is improved. The charge which flows away quickly can also better ensure that the charge distribution of the whole coated object is in a relatively close state, which is beneficial to the average dispersion of paint mist adsorption, thereby ensuring that the film thickness has certain uniformity.

Aiming at the electrostatic coating charge transfer principle, the invention shortens the path of transferring the coating charge on the product to the ground and reduces the accumulated amount of the charge on the component, thereby reducing the repulsion action on the unadhered charged paint mist, finally adsorbing more paint mist and increasing the thickness of the paint film.

Drawings

Fig. 1 is a diagram showing the effect of conventional spraying before the technical scheme of the invention is adopted.

Fig. 2 is a schematic structural view of the artificial board to be coated and the metal layer in embodiment 1.

Fig. 3 is a schematic structural diagram of a metal layer in embodiment 1.

Fig. 4 is a diagram of the spraying effect after the scheme of the invention is adopted.

Detailed Description

The invention is further illustrated by the following examples, but the scope of the invention as claimed is not limited to the scope of the examples.

Comparative example 1:

as shown in FIG. 1, in conventional spraying, A is the atomized particles of the coating material and B is the negative charge; the negatively charged coating particles fly from the rotating cup C to the grounded coated object D under the action of the electrostatic field, and after the point-charged coating particles contact the coated object, the negative charges flow to the ground along the coated object. The wood is poor conductor, and the negative charge that piles up on it can't flow to ground fast, and the negative charge that especially long part kept away from the hanger end is more difficult to flow away, leads to the negative charge to pile up and repels other paint droplets of waiting the negative charge, makes the membrane thickness unable promotion. The uniformity of the paint film thickness is also affected by this to make a certain difference.

Example 1:

as shown in fig. 2-4, the coating is performed according to the present invention. Firstly, arranging a metal layer 2 on the back of an artificial plate 1 to be coated, enabling the metal layer to be in contact with the metal layer, and grounding the metal layer; and finally performing electrostatic coating.

Further, the metal layer is selected to be an aluminum sheet. The more free electrons of the metal layer, the better the conductivity, the more favorable the flow away of the deposited charges, and the more the thickness of the paint film is increased.

Furthermore, the upper part of the metal layer is connected with the upper part of the artificial board to be coated, and the sizes of the bottom and two sides of the metal layer are smaller than the sizes of the corresponding positions of the artificial board to be coated. Can ensure that the metal layer is not attached with paint mist after finishing coating, thereby being capable of being repeatedly used.

Further, the bottom and the edges of both sides of the metal layer are 20mm from the edge of the artificial board to be coated. The coating effect can be ensured, and the adhesion of paint mist can be prevented.

The metal layer comprises a hard metal layer 21 at the lower part and a soft metal layer 22 at the upper part, the hard metal layer is detachably connected with the soft metal layer, and the soft metal layer is connected with the upper part of the artificial board to be coated. After the soft metal is repeatedly connected with the artificial board or disconnected, certain damage is caused, the soft metal layer and the hard metal layer are required to be replaced, the service life of the hard metal layer can be prolonged, the soft metal layer only needs to be replaced according to the requirement, and the cost is saved.

The top of the soft metal layer is bent to be tightly attached to the top of the artificial board to be coated and then fixed by an air nail 3; the hard metal layer and the soft metal layer are adhered to each other by a color separation paper 23. The upper part adopts the soft metal layer, easily buckles, realizes the fixed connection with the top of artificial board fast. The air nail is also connected with a hook 4, which is convenient for coating.

The metal layer is positioned between the two artificial boards to be coated and is clamped through the back surfaces to be coated of the two artificial boards. Because only one side of the artificial board is required to be subjected to electrostatic coating, the metal layer is clamped between the two artificial boards, and the working efficiency can be improved.

The thickness of the metal layer is 1 mm. And the phenomenon that redundant paint mist is adsorbed by an aluminum sheet when the thickness is too thick and paint at the contact part of two products which are too thin is adhered together after being dried is avoided, so that the product quality is influenced.

The artificial board is a medium density fiberboard. The method is also suitable for electrostatic spraying of other materials with poor conductive effect. Should be within the scope of the present invention.

The coated artificial board obtained by the method can be used for piano parts.

TABLE 1

The data for the specific coating are shown in Table 1, where the thickness of the thin aluminum clip was 0.5mm and the thickness of the thick aluminum clip was 1 mm.

Claims

1. A method for improving the electrostatic coating efficiency of artificial boards is characterized in that: arranging a metal layer on the back of the artificial board to be coated, enabling the metal layer to be in contact with the metal layer, and grounding the metal layer; finally, performing electrostatic coating; the metal layer is an aluminum sheet; the metal layer comprises a hard metal layer at the lower part and a soft metal layer at the upper part, the hard metal layer is detachably connected with the soft metal layer, and the soft metal layer is connected with the upper part of the artificial board to be coated; the top of the soft metal layer is bent to be tightly attached to the top of the artificial board to be coated and then fixed by an air nail; one side surface of the lower end of the soft metal layer and one side surface of the upper end of the hard metal layer are adhered by color separation paper; the upper part of the metal layer is connected with the upper part of the artificial board to be coated, and the sizes of the bottom and two sides of the metal layer are smaller than the sizes of the corresponding positions of the artificial board to be coated; the thickness of the metal layer is 1 mm.

2. The method of claim 1, wherein: the bottom and the edges of the two sides of the metal layer are 20mm away from the edge of the artificial board to be coated.

3. The method according to any one of claims 1-2, wherein: the metal layer is positioned between the two artificial boards to be coated and is clamped through the back surfaces to be coated of the two artificial boards.

4. The method according to any one of claims 1-2, wherein: the artificial board is a medium density fiberboard.