JPH07112158A - Coating patterning method for long-sized material - Google Patents

Abstract

PURPOSE:To enable the application of continuous and discontinuous patterns having a natural variety, such as woodgrains, without increasing man-power partially scraping color finish coating films by a coating film scraping means right after color finish coating and before color finish coating and curing treatment. CONSTITUTION:A pipe which is the long-sized object W is first subjected to color primer coating. The pipe W is then set on a conveyor 18 and a coating material C is charged into a coating material tank. A suction device is thereafter operated to maintain a prescribed pressure in a reduced pressure coating chamber 12, and simultaneously, a valve of a coating material supply pipe between the reduced pressure coating chamber 12 and the coating material tank is opened. Air, then, flows in from the clearance with the material W to be coated in an inlet 12a and outlet 12b of the reduced pressure coating chamber 12 and, therefore, the agitating flow of the air is generated in the reduced pressure coating chamber 12 and the liquid coating material is atomized to mists so that the coating material C sticks to the material W to be coated. The excess coating material is removed in the outlet 12b. The uncured coating film prior to entry into a coating film curing device 20 is partially scraped off at the time of passing the scraping means. The flow patterns are thus formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating patterning method for a long product and a vacuum coating system used therefor. Especially, metal pipes, channels, angles, T-shaped members, H
The present invention is suitable for applying a continuous / discontinuous flow pattern such as a wood grain pattern to a shape member by painting.

[0002]

2. Description of the Related Art Recently, as a means for coating long objects, instead of conventional brush coating, spray coating, roller coating, curtain coater, etc., there is no scattering of paint / solvent mist, Attention is being focused on a reduced-pressure coating method that is easy to adjust (Japanese Patent Laid-Open No. 4-313361 / 326960).

The principle is that a decompression chamber having an inlet and an outlet that are similar to the cross section so as to have a minute gap (usually 1 to 5 mm) when conveying a long object, and a long object between the inlet and the outlet. The liquid coating material is supplied from the bottom while the (object to be coated) is conveyed to coat the object to be coated. At this time, when air flows in through the gap between the inlet and the outlet and the object to be coated, an agitating flow of air is generated in the decompression chamber to mist the liquid paint, and the paint adheres to the object to be coated. At the outlet, excess paint is removed by the air flow. That is, by adjusting the gap, the degree of reduced pressure, and the transfer speed of the object to be coated, the speed of air flow changes, and the thickness of the coating film can be easily adjusted.

[0004]

However, this reduced pressure coating is usually used for forming a monochromatic coating surface, and has not been used as a method for forming a two-color coating pattern on a long product. . At this time, it is conceivable that vacuum coating is performed in a state in which a long-colored material is masked, but this requires a lot of labor for masking and only a monotonous uniform pattern can be formed. That is, it was not possible to add a continuous and discontinuous flow pattern with natural diversity such as wood grain.

If the masking material is thick, the gap formed between the long object and the inlet / outlet will not be uniform in the peripheral direction,
It is conceivable that problems such as that the paint is not sufficiently misted or that the amount of the paint adhered is likely to vary are generated.

In view of the above, the present invention provides a natural and diverse continuous / discontinuous flow pattern such as wood grain,
It is an object of the present invention to provide a coating patterning method for a long product that can be performed without increasing the number of steps.

[0007]

SUMMARY OF THE INVENTION A method for coating a long object with a coating pattern according to the present invention solves the above problems by the following constitutions.

When a two-color pattern to be painted is formed on the surface of a long product on which a undercolor-cured coating film has been formed by reduced pressure coating, immediately after overcoating and before curing by overcoating, a coating film scraping means is used. It is characterized in that patterning is performed by partially scraping off the color coating film.

[0009]

Next, an embodiment of the present invention will be described in detail with reference to FIGS.

(1) An example of the reduced pressure coating apparatus main body 10 used in the method of the present invention is shown in FIGS.

Basically, the depressurizing coating apparatus main body 10 includes a depressurizing coating chamber 12, a suction device 14 for maintaining the depressurizing coating chamber 12 in a depressurized state, and a paint for supplying a liquid coating material C to the depressurizing coating chamber 12. And a tank 16. Specifically, the paint tank 16 is a main tank 16a that stores and collects paint.
And a supply tank 16b capable of heating the paint. A feed conveyor 18 is attached to the entrance side of the reduced pressure coating chamber 12. A coating film curing device 20 is attached to the outlet side of the reduced pressure coating chamber 12. In the illustrated example, the ultraviolet lamps 21 are respectively provided on the lower side, the both sides, and the upper side in the furnace in the order of conveyance of long objects,
Although two ultraviolet curing devices are provided, a hot air curing device, a far infrared curing device, an electron beam curing (EBC) device, or the like may be used depending on the type of paint. Further, in FIG. 1, reference numeral 22 is an operation panel, and in FIG. 2, reference numeral 23 is a take-up roller.

At the inlet 12a and the outlet 12b of the vacuum coating chamber 12, the template 25 can be replaced so as to accommodate long objects W having different cross-sections.
4, 26 are formed. Up to this point, the configuration is the same as that of the conventional example.

(2) The reduced pressure coating system of the present embodiment has the following characteristic configuration in the above configuration.

An upper color coating film scraping means 30 is provided between the outlet 12b of the coating chamber 12 of the main body 10 of the reduced pressure coating device and the inlet 20a of the coating film curing device 20. As the coating film scraping means, a ring body 30 having saw teeth on the inside as shown in FIG. 3 or a ring body (coating film scraping means) 30A formed by a gentle scissors as shown in FIG. 4 is used. It is possible. It is desirable that these ring bodies can be rocked horizontally or vertically or can be rotated by a cam mechanism and gear lights on the outside. Although the number of ring bodies is one in the illustrated example, two or more ring bodies may be appropriately arranged.

(3) Next, the mode of use of the above embodiment will be described.

First, a pipe which is a long object W is polished,
After primer coating, apply undercolor coating. This undercolor painting is
Although reduced pressure coating may be used, it may be formed by other coating means (for example, powder coating).

Next, the pipe (long product) W is set on the conveyor 18 and the paint C is applied to the paint tank 16
Throw in. Here, as the paint, an ultraviolet curable (photocurable) type paint is used in the present embodiment, but a solvent type paint, a water-based paint, an emulsion paint, a suspension paint, a solventless paint, an EBC paint, depending on the curing device. Etc. are optional. In particular, an ultraviolet curable coating material is preferable because the coating film does not sag within a curing time of several seconds.

Thereafter, the suction device 14 is operated to move the vacuum coating chamber 12 to 50 to 150 mmHg (6665 to 2000).
(0P), and at the same time, the valve of the paint supply pipe between the decompression coating chamber 12 and the paint tank 16 is opened. further,
The conveyor 18 is operated.

Then, air flows in through the gap between the inlet and the outlet of the reduced pressure coating chamber 12 and the object W to be coated, whereby an agitated flow of air is generated in the reduced pressure coating chamber 12 to mist the liquid coating material, The coating material C adheres to the object W to be coated, and excess coating material is removed by the air flow at the outlet 12b.

In this way, the outlet 12a of the vacuum coating chamber 12
The long object which comes out of the apparatus and on which the upper color coating film is formed passes through the scraping means 30. At this time, the upper color coating film is uncured because it has not yet been carried into the coating film curing device, and is partially scraped off to form a flow pattern such as a wood grain pattern on the pipe surface.

At this time, the flow pattern is undulated by partially rotating the ring body 30. Further, a spiral flow pattern is formed by completely rotating it. Furthermore, when the ring body is swung up and down and left and right, the pressure contact degree of the scraping teeth changes or is temporarily separated, so that the flow pattern can be made thin and thick. By combining these, various flow patterns can be formed.

In the above-mentioned embodiment, the metal pipe is taken as an example, but the material may be any of plastic, ceramic (concrete), fibrous material, wood and the like, and even if it is not a pipe material, a round bar. , Square bar, strip plate, extruded material with irregular cross section, etc. are optional.

[0023]

The function and effect of the present invention The method for coating a pattern on a long product and the vacuum coating system used therefor have the following functions and effects due to the above constitution.

By disposing a coating film writer between the outlet of the main body of the reduced pressure coating device and the inlet of the coating film curing device,
Immediately after overcoating and before curing of overcoating, the above overcoating coating film is partially scraped. By scraping the scraping means up and down, left and right, a continuous / discontinuous flow pattern is obtained. Can be formed on the surface of a long object.

Therefore, it is possible to attach a continuous and discontinuous flow pattern having natural diversity such as wood grain to the surface of a long object without increasing the number of steps.

[Brief description of drawings]

FIG. 1 is an overall schematic perspective view showing an example of a reduced pressure coating apparatus used in the present invention.

FIG. 2 is an overall schematic process diagram of a reduced pressure coating system used in the method of coating a long object according to the present invention.

FIG. 3 is a perspective view showing an example of a coating film scraping means used in the coating patterning method of the present invention.

FIG. 4 is a front view showing another example of the coating film scraping means.

[Explanation of symbols]

 10 Main body of reduced pressure coating apparatus 12 Reduced pressure coating chamber 14 Suction device (pressure reducing means) 16 Paint tank 20 Coating film curing device (ultraviolet curing device) 25 Template 30, 30A Scraping means C Paint W Long object (pipe, object to be coated) )

Claims (3)

[Claims] 1. A coating film scraping means immediately after overcoating and before overcoating and curing treatment, when a two-color pattern to be coated is formed on the surface of a long object on which a undercolor cured coating film has been formed by vacuum coating. 2. A method for coating and patterning a long object, characterized in that patterning is performed by partially scraping off the overcolor coating film. 2. A reduced pressure coating system for use in the method for patterning a coating of a long object according to claim 1, wherein the reduced pressure coating chamber has an outlet of a reduced pressure coating chamber and an inlet of a coating film curing device.
A reduced-pressure coating apparatus having a means for scraping an overcoat coating film. 3. The reduced pressure coating system according to claim 2, wherein the coating film curing device is an ultraviolet curing device.