JPS6012099B2 - Coating curing method and coating curing device - Google Patents

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 to be coated, such as substrates with irregularities, but in the case of coating by the general dipping method, the coating thickness can be adjusted by adjusting the non-volatile content of the coating liquid, for example, if a thin coating is desired. Methods of lowering the viscosity by lowering the temperature and methods of lowering the viscosity by increasing the temperature have been used.

However, the addition of low-viscosity monomers for the purpose of lowering the viscosity in recent ultraviolet-curable resin compositions aimed at making them pollution-free may deteriorate product characteristics, such as poor adhesion to ceramic substrates. .

Addition of a filler is also undesirable from the viewpoint of adverse effects on properties and pollution. Lowering the viscosity due to increased temperature may shorten the pot life of the coating fluid, making workability worse.
In terms of quality, solidified resin may adhere to the product, leading to defects. Furthermore, if the plate to be coated is held vertically and placed directly into the curing bag, the viscosity will decrease due to the temperature rise in the cured area and flow into the coating liquid, resulting in poor appearance due to sagging and coating on the lower part of the plate. The work thickness is excessively defective. 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. The present invention has been made with the aim of improving these drawbacks, and the coating amount 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 relates to a coating curing method and apparatus for horizontally curing a plate to be coated which has been coated by dipping.

In the present invention, after soaking the plate to be coated in the coating solution in the soaking tank,
A coating curing method characterized by slowly pulling up the coated plate vertically, then setting the coated plate horizontally and curing the coating solution on the coated plate, a conveying chain, and attachment to a conveying chain. The above-mentioned plate with the coated plate attached thereto is equipped with an attachment for attaching the plate to be coated, a bonding tank containing the coating liquid, a guide for rotating and holding the attachment by 900 rotations backward, and a curing device for curing the coating liquid. The attachment is moved by the conveyor chain, and after the plate to be coated is immersed in the dipping tank, the plate to be coated is vertically raised and slowly pulled up.Then, the attachment is rotated 90 degrees backward by the guide and the plate is coated. This invention relates to a coating and curing device in which a plate is sent horizontally to a curing device.

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

In the present invention, the object to be coated must be immersed in the coating solution and then slowly pulled up vertically.

The soaking 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 bonding tank is fixed and only the liquid level of the coating liquid rises and falls. The plate to be coated is vertically pulled up from the coating liquid, and then the plate to be coated is made horizontal so that the coating liquid on the plate is cured. The coating liquid is cured using an ultraviolet curing lamp, an infrared heater, or the like. The speed at which the plate to be coated is pulled up from the coating solution is such that, for example, in the case of a ceramic hybrid IC substrate of 1000 square meters and 4000 square meters, it takes about 30 seconds to 2 minutes. The coating liquid contains a thermosetting resin, a photocurable resin, and the like.

For example, acrylic resins, unsaturated polyester resins, epoxy resins, acrylic modified polybutadiene resins, methacrylic 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 device of the present invention will be explained with reference to the 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 cross-sectional view of the coating curing device of the device shown in Fig. 1 in the direction of chain movement at a position before the plate to be coated enters the cover of the bonding part. Figure 3 is a diagram showing an example of a workpiece plate mounting attachment that supports a workpiece plate vertically, and Figure 4 is a diagram showing an example of a workpiece plate mounting attachment that supports a workpiece plate horizontally. It is a figure showing an example.

In the figure, a plate to be coated 11 is attached to a conveying chain 1 having a plate-to-be-coated attachment attachment 10 and moved, and is immersed in a coating solution in a saruno tank 3.

The plate 11 to be coated is then vertically raised from the thickening tank in the state shown in FIG. The pulling speed is preferably in the range of IQ/3 minutes to IW/2 minutes. Next, the plate to be coated is placed horizontally and sent to a curing furnace 5 in the state shown in FIG. 4, where the coating liquid is cured. In the figure, 2 is a sprocket wheel for driving the chain, 4 is a cover for the immersion section, 6 is an ultraviolet lamp, 7 is a stand, 8 is a chain guide, and 9 is an attachment 900
This is a guide to rotate and hold, and an attachment for attaching the plate to be coated.

Using the above equipment, the coating liquid was Tuffy UV curing type #3400 manufactured by Hitachi Chemical Co., Ltd., and the plate to be coated was Ceramic Hybrid I (vertical IQ broadside x 4cm wide).
Using C board, chain running speed 600 ribs/min, board lifting time 1 minute, ultraviolet curing lamp Ushio 3rd place hW/
By applying and curing two layers on the top and two layers on the bottom of the skin with an effective emission length of 1000, a hybrid IC substrate with good appearance and characteristics was obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a coating curing device according to an embodiment of the present invention, and Fig. 2 is a progression of the chain in the device shown in Fig. 1 at a position before the plate to be coated enters the cover of the erosion section. A vertical cross-sectional view with respect to the direction, Fig. 3 is a diagram showing an example of a to-be-coated plate mounting attachment that supports the to-be-coated plate vertically, and Fig. 4 shows a to-be-coated plate mounting attachment that supports the to-be-coated plate horizontally. It is a figure showing an example. Explanation of symbols: 1... Conveyance chain with attachment for attaching the plate to be coated, 2... Sprocket wheel, 3... Enriching tank, 4...... Clarifying section cover, 5...hardening furnace, 6...ultraviolet lamp, 7...cradle, 8...chain guide,
9... Guide for rotating and holding the attachment by 90 degrees, 10... Attachment for mounting the plate to be coated, 11
・・・・・・Plate to be coated. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. After the plate to be coated is immersed in the coating liquid in a dipping tank, the plate to be coated is held vertically and slowly pulled up, and then the plate to be coated is held horizontally and coated with the coating liquid of the plate to be coated. A coating curing method characterized by curing. 2. A conveyance chain, a coating plate attachment attached to the conveyance chain, an immersion tank containing a coating liquid, a guide for rotating and holding the attachment by 90 degrees backwards, and a curing device for curing the coating liquid. In preparation, move the above-mentioned attachment with the plate to be coated attached to it using a conveyance chain, and after immersing the plate to be coated in the dipping tank, slowly pull up the plate to be coated vertically, and then move the above-mentioned attachment to the rear using the guide. A coating curing device that rotates the plate by 90° to make the plate to be coated horizontal before sending it to the curing device.