JPS61209073A - Method for depositing resin to end surface of metal plate - Google Patents

Abstract

PURPOSE:To facilitate rust-proof treatment, by applying the printing deposition of a resin paste to the cut end surface of a metal plate such as a printed wiring board by using a metal mask equipped with an opening corresponding to said end surface. CONSTITUTION:When a silicon steel plate with a thickness of 1.0mm is used as a printing wiring board utilized as the printed circuit board of electronic machinery, wiring layers 3 by the cladding of a copper foil with a thickness of about 35mum are formed to the surface part of a metal plate 1 in a desired pattern through an insulating resin layer with a thickness of 50mum and the coated metal plate 1 is cut into a definite dimension to expose the side end surface 4 thereof. After the metal plate 1 is fixed to a mount stand 5, a metal mask 8 is superposed to supply a resin paste 10 through the opening 9 thereof to deposit a resin layer 11 to the end surface 4 of the metal plate 1. By this method, a resin layer having good uniformity is formed and rust-proof effect is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for treating the end face of a cut metal plate, and more particularly to a method for applying a rust-proofing resin to the end face.

Conventional technologyPrinted wiring boards are used as circuit boards for electronic devices.
In many cases, a large area board is cut into a printed wiring board body of a predetermined size. In this case, the cut end surface requires appropriate end surface treatment. For example, if the substrate body is made of iron plate, it is essential that the cut end surface be rust-proofed.

Conventionally, chromate treatment or Teflon coating treatment has been carried out as a rust-proofing measure for metal plates, but there are many problems when using these treatment methods to treat the end faces of cut metal plates.

Problems to be Solved by the Invention Printed wiring boards are produced by forming circuit wiring materials on a large metal plate and then cutting them into areas that include a predetermined circuit wiring material. It is quite difficult to carry out treatment. This is particularly difficult or inefficient when the cut end surface has a complicated ridgeline shape.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a step of printing and applying a resin paste to the cut end face of a metal plate using a metal mask having an opening corresponding to the cut end face. The present invention provides a method for adhering resin to the end face of a metal plate having the following properties.

Effect: According to the present invention, it is possible to apply a thick resin to the end face of a metal plate after cutting by a printing method,
Since a metal mask can be freely prepared even on the end face of a metal plate having a complicated ridge shape, the resin can be applied efficiently and uniformly.

Embodiment FIG. 1 is a developed sectional view for outlining an embodiment of the present invention, and FIGS. 2a and 2b are sectional views showing the process of forming a metal plate used in this embodiment. Hereinafter, the present invention will be explained in detail by examples with reference to the drawings.

In FIG. 1, the metal plate 1 is made of a silicon steel plate with a thickness of 1.01111 mm, and a copper foil with a nominal thickness of 35 μm is laminated on the surface of this plate through an insulating resin layer 2 with a thickness of 60 μm. After the wiring layer 3 is patterned, it is cut into a certain size so that the side end surfaces 4 are exposed. Then, this metal plate 1 is fixed on a mounting table 6. It is preferable that the mounting table 5 is provided with a recess 6 so that an appropriate gap is formed at the lower part of the side end 4 when the metal plate 1 is fixed. Further, it is preferable to arrange backing plates 7 of approximately the same thickness around the metal plate 1 at appropriate intervals to eliminate differences in level.

Next, a metal mask 8 is placed over the metal plate 1, and a resin paste 1° is supplied through the opening 9 to coat the end face 4 of the metal plate 1 with a resin layer 11. The opening 9 of the metal mask 8 is provided along the cut end surface of the metal plate 1,
It is preferable to have a structure in which a stepped portion is formed inside the opening to create a reservoir capable of supplying a sufficient amount of resin paste. To give an example of the shape of this metal mask 8, the thickness is 0.2+w
A phosphor-backed copper plate is prepared, and a through groove with a width of about 1.0II1 along the cut end surface of the metal plate 1 is formed therein by an etching technique.

In addition, when connecting the masks, 0.
All you have to do is leave the metal in five terms. Further, the backing plate 7 may be fixed using, for example, an epoxy resin molded plate having a thickness of 1.0 mm so that the distance from the cut end surface 4 of the metal plate 1 is approximately 1.0 On. The mounting table 5 is made of, for example, a phenol resin molded plate, and if necessary, an appropriate adsorption aid may be used in combination to ensure that the metal plate 1 and the backing plate 7 are sufficiently fixed in position when placed thereon. good. The resin paste 1o is sent to the opening 9 of the metal mask 8 by moving the squeegee 12, and flows from the opening 9 onto the end surface 4 of the metal plate 1 in a single layer, leaving a thickness of 10 to 20 μm on the same surface.
The viscosity, fluidity, etc. are adjusted so that a resin layer 11 of m is formed, and printing is applied. The resin paste 10 is made of, for example, an epoxy resin (base resin) known as product name 828 manufactured by Shell Oil Co., Ltd., and an aromatic amine adduct (curing agent).
A solvent-free epoxy resin layer can be used in which equivalent amounts of epoxy resin are mixed, and after printing and coating, a durable epoxy resin layer can be obtained by heat treatment at 160''C for 30 minutes.

FIG. 2a shows the raw material substrate of the metal plate 1, and the silicon steel plate 1
A copper foil 3' for wiring is pasted 9 on the wafer with an insulating resin layer 2 interposed therebetween. Next, the wiring steel foil 3' is processed into a predetermined circuit wiring pattern 3 using a well-known etching technique, as shown in FIG. It is used for cutting, and the side end surface 4 remains exposed.

According to the above procedure, the rusting property of the cut end surface of the metal plate coated with the resin layer was tested, and it was found that
It had a rusting durability of 1000 hours or more under conditions of 90 to 95% relative humidity at 9°C.

In addition, as a comparative test, O, OS~0.06 was added to the same resin layer.
- When a small hole of the same diameter was provided and the durability was checked under the same conditions, rusting was observed on the metal end surface of the small hole after 240 hours.

Effects of the Invention According to the method of the present invention, a resin layer with good uniformity can be applied to the cut end surface of a metal plate by applying a plane printing method, and the rust prevention effect can be enhanced. . In addition, when forming the resin layer, by carefully considering the adjustment 2 selection of the resin paste, even if there is some burr on the cut end surface, it is possible to provide a thick resin layer that wraps it.
Quality stability can also be improved.

FIG. 1 is a developed sectional view for outlining an embodiment of the present invention, and FIGS. 2a and 2b are sectional views showing the process of forming a metal plate used in the embodiment of the present invention.

1...Metal plate, 2...Insulating resin layer, 3
...Wiring (copper foil), 4... End surface, 5.
...Placement table, 6...Recessed part, 7...
...Packing plate, 8...Metal mask, 9...
...Opening, 10...Resin paste, 11...
...resin layer, 12...squeegee.

Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (2)

[Claims] (1) A method for applying resin to the cut end face of a metal plate, which includes the step of printing and applying resin paste to the cut end face of the metal plate using a metal mask having openings corresponding to the same end face. (2) The method for applying resin to an end face of a metal plate according to claim 1, wherein the metal mask has a stepped opening shape.