JPS6022961A - Method and device for coating and curing - Google Patents

Abstract

PURPOSE:To improve the appearance and characteristic of a plate to be coated by placing horizontally the plate which is dipped in a coating liquid and is then pulled up perpendicularly and preheating the coating liquid then curing the same. CONSTITUTION:A plate 11 to be coated is attached to a chain 1 for conveyance having an attachment 10 and is dipped in the coating liquid in a dipping tank and thereafter the plate is pulled up perpendicularly. The plate 11 is then placed horizontal and is fed into a preheating furnace and further to a curing furnace where the coating liquid is cured. Then the plate to be coated has good appearance without spoiling the characteristic thereof.

Description

[Detailed description of the invention] The present invention relates to a coating curing method and a coating curing device.

There are various methods of coating surfaces such as substrates with uneven surfaces, but the most common method is dipping.In the case of coating, the coating thickness can be adjusted using the non-volatile coating method, for example, if a thin coating is desired. Methods of lowering the viscosity by lowering the temperature and methods of lowering the viscosity by using a temperature amplifier have been used.

However, in recent ultraviolet curable resin compositions that aim to be pollution-free, the addition of low-viscosity monomers for the purpose of lowering the viscosity may deteriorate product properties, such as poor adhesion to ceramic substrates. be. Further, addition of a solvent is undesirable from the viewpoint of adverse effects on properties and pollution. Lowering the viscosity due to increased temperature may shorten the Z life (pot life) of the coating fluid, resulting in poor workability and quality issues such as solidified resin adhering to the product. Furthermore, if the plate to be coated is placed in the curing device while being held vertically, the viscosity will decrease due to the temperature increase in the curing section, causing the coating liquid to flow, resulting in poor appearance due to sagging and the lower part of the plate to be coated. Excessive coating thickness results in defects. Particularly when applying a colored coating solution containing a pigment and curing it with ultraviolet rays, excessive coating thickness at the bottom of the substrate tends to cause wrinkles in the coating film. Furthermore, if the coating is introduced directly into the curing oven after coating, the remaining air will be trapped in the curing oven at the contact area between the small parts mounted on the plate to be coated and the area where the small parts are connected. The coating liquid on the plate to be coated expands and hardens at the same time, and the holes that allow the air released by the thermal expansion to harden harden.

The surface hardens to a swollen state, and the appearance and characteristics of the coated plate are significantly impaired.

The present invention has been made with the aim of alleviating all of these drawbacks, and the amount of coating is adjusted by vertically pulling up the coated plate immersed in the coating liquid from the coating liquid, and the plate is held vertically. The present invention provides a coating curing method and apparatus for preheating and curing a dip-coated plate in a horizontal position.

In the present invention, after the plate to be coated is immersed in the coating liquid in the immersion tank,
A coating curing method in which the coating liquid on the coated plate is cured after preheating by holding the plate vertically and slowly lifting it horizontally, as well as a plate moving device and housing the coating liquid. The board to be coated is immersed in the coating solution and then slowly held vertically. The coating curing device is configured such that the plate to be coated is pulled up, the plate to be coated is held horizontally, the applied coating liquid is preheated in a preheating device, and then the applied coating liquid is cured in a curing device. Regarding. .

Examples of coated boards to which the present invention is applied include ceramic hybrid IC boards, small-sized printed wiring boards, and the like.

As the device for moving the plate to be coated, a traveling chain, a hanger that is moved intermittently, or the like is used.

In the present invention, the object to be coated is immersed in the coating solution.

It needs to be pulled up slowly and vertically.

The immersion tank containing the coating liquid may be fixed, but may also be structured to be movable up and down.

It is also possible to have a structure in which the immersion tank is fixed and only the liquid level of the coating liquid moves up and down. The plate to be coated is vertically pulled up from the coating liquid, and then the plate to be coated is made horizontal, and the coating liquid on the plate to be coated is preheated. As a preheating furnace, a hot air furnace, a far-infrared furnace, etc. can be used. The coating solution is then cured. The coating liquid is cured using a curing furnace equipped with an ultraviolet curing lamp, an infrared heater, and the like. The speed at which the plate to be coated is pulled up from the coating liquid is 1. For example, in the case of a ceramic hybrid IC substrate measuring 10+n+n in length and 40 mm in width, it takes about 30 seconds to 2 minutes to pull it up.

Since the temperature of the curing furnace is usually 100 to 110'C or less, the temperature of the preheating furnace is preferably 80 to 100C. The coated plate can be preheated to a temperature close to the curing temperature.

The coating liquid contains a thermosetting resin, a photocurable resin, and the like. For example, acrylic resin, unsaturated polyester resin,
Epoxy resin, acrylic modified polybutane diene resin 2
Methacryl-modified polybutadiene resins, epoxy acrylate resins, polyester acrylate resins, etc. are used alone or in combination with monomers.

An example of the coating curing method and coating curing apparatus of the present invention will be explained with reference to the drawings.

Figure 1 is a cross-sectional view of a coating curing device according to an embodiment of the present invention, and Figure 2 is a chain of the equipment piece shown in Figure 1 in a position before the plate to be coated enters the cover of the immersion section. Vertical sectional view with respect to the direction of movement, Figure 3 is a diagram showing an example of a plate to be coated 'fJ supported vertically, and Figure 4 is a diagram showing an example of a plate to be coated supported horizontally. It is a figure which shows an example of a board attachment attachment.

In the figure, the plate to be coated 11 is moved out of the conveyor chain 1 having a Q attachment 10, and is immersed in the coating liquid in the dipping tank 3.

Next, the plate 11 to be coated is made vertical.

It is lifted out of the V-immersion tank in the state shown in Figure 3. The pulling speed is 10 mm/30 seconds to 1.0 m
It is preferable to set it in the range of m/2 minutes. Next, the top plate to be coated is placed horizontally and sent to a preheating furnace 12 in the state shown in FIG. 4, where it is preheated 7, and further sent to a curing furnace 5 where the coating liquid is cured.

In the figure, 2 is a sprocket foil for driving the chain, 4 is a cover for the immersion section, 6 is an ultraviolet lamp, and 7 is a sprocket wheel for driving the chain.
mount frame, 8 is chain guide, 9 is attachment 9
A guide that rotates and holds 0 degrees.

Reference numeral 10 is an attachment for attaching the plate to be coated, and reference numeral 13 is a far-infrared heater.

Using the above apparatus, the coating liquid was Tatsufi UV curing type +3340K manufactured by Hitachi Chemical Co., Ltd.

A ceramic hybrid IC board measuring 10 mm in length x 40 mm in width was used as the plate to be coated, and the chain running speed was 300.
mm/min, substrate lifting time 1 minute, preheating using a far infrared heater (Infrajet FT type IKWX manufactured by Shadow Co., Ltd.)
2 pieces) at a surface temperature of 90°C on the surface of the coated plate using an ultraviolet curing lamp 30 mW/cm', effective emission length 800
When the coating was cured with 2 pieces on the top and 2 pieces on the bottom,
A hybrid IC substrate having good appearance and characteristics was obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a coating curing device according to an embodiment of the present invention, and Fig. 2 is a traveling direction of the chain at a position before the plate to be coated enters the cover of the dipping section of the device of Fig. 1. Figure 3 is a diagram showing an example of the attachment for attaching a plate to be coated with the plate supported vertically, and Figure 4 is a vertical cross-sectional view of the plate to be coated with the plate supported horizontally. It is a figure showing an example of a touchment. Explanation of symbols 1... Conveyance chain with attachment for attaching the plate to be coated 2... Suffo kelle 1; Ile 3...&+ff
e'ink 4...Cover of immersion m part 5...Curing furnace 6.
... Ultraviolet lamp 7 ... Frame 8 ... Chain guide 9 ... 7 Holding guide 10 that rotates the touch panel 90'... Attachment for attaching the plate to be coated 11 ... Plate to be coated] 2. ...Preheating furnace 13...far infrared rays E1-tar1-□

Claims (1)

[Scope of Claims] 1. A body in which a plate to be coated is immersed in a coating liquid in a dipping tank. A coating curing method characterized by slowly pulling up the coated board vertically, then holding the coated board horizontal, and preheating the coating solution on the coated board. 2 Coated plate moving device, immersion tank containing coating liquid,
This equipment is equipped with a preheating device for preheating the coated coating solution and a curing device for curing the coating solution. A coating curing device which preheats a coating solution applied in a preheating device with a plate to be coated horizontally, and then hardens the coating solution in a curing device.