JPH0329393A - Metal-clad laminated plate - Google Patents

Abstract

PURPOSE:To prevent sliding of an edge of a drill at the time of making a hole for processing a printed wiring board by forming a roughed metal foil on the outer layer surface of an insulating layer. CONSTITUTION:A metal-clad laminated plate A can be obtained by piling one sheet or a plurality sheets of prepregs, while a metal foil 2 having roughed both surfaces is arranged on the outer layer of an insulating layer thereof 1 followed by pressing and heating. One side roughed face of the roughed metal foil 2 is for heightening adhesive force to the prepreg while the roughed face of the metal foil 2 exposed outside in the other side metal clad laminated plate A is for checking a slide of an edge of a drill. Thereby, the slide of the edge of the drill at the time of making a hole by drill in order to process the metal- clad laminated plate A into a printed wiring board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a metal cladding layer used for printed wiring boards and the like. In particular, the present invention relates to a metal-clad laminate that has been subjected to a drilling process when being processed into a printed wiring board.

[Conventional technology]

In recent years, electronic components have become increasingly densely mounted on printed wiring boards. For this reason, there is a strong need for metal-clad laminates that can be machined with a large number of minute holes with ease. However, the metal foil used in -C is a metal foil that is roughened on one side, and the roughened side is used to increase the adhesive strength with the insulating layer, and the metal foil exposed on the external surface is smooth and not roughened. This is a good aspect. For this reason, when drilling holes with a drill, the cutting edge of the drill tends to slip, making it difficult to accurately drill holes in the predetermined position, which tends to cause misalignment, which is one of the causes of large variations in machining dimensions. It had become. On the other hand, in order to drill holes efficiently, it is common practice to stack multiple metal-clad laminates and drill them using a drill. Therefore, the rotational force of the drill causes misalignment between the metal-clad laminates. Metal clad lj1j layered for this purpose
! It was difficult to accurately drill holes at predetermined positions between the l plates, and misalignment was likely to occur, which was one of the causes of large variations in dimensional accuracy. [Problems to be Solved by the Invention] The present invention prevents the tip of the drill from slipping when making six holes with a drill to process a metal-clad laminate into a printed wiring board, and also The object of the present invention is to provide a metal-clad laminate that can prevent misalignment between the metal-clad laminates when drilling is performed by stacking multiple sheets, and can improve the dimensional accuracy of drilling. Means] The present invention has been made in view of the above points, and its gist is a metal-clad laminate characterized in that a metal foil roughened on both sides is formed on the outer surface of an insulating layer. The present invention will be explained below based on the drawings. Figure 1 is a cross-sectional view of the metal-clad laminate of the present invention, and Figure 2 is a cross-sectional view of the metal-clad laminate before it is laminated to form a metal-clad laminate. It is an exploded view showing each structural material in an easy-to-understand manner.

The insulating layer 1 of the present invention is made of one or more Brypreg 3, which is a base material impregnated with a resin and semi-cured.The resin is made of epoxy resin, polyimide resin, phenol, etc. thermosetting resins such as resins, polyester resins, fluorocarbon resins, and modified resins,
As the base material, glass cloth or the like is usually used.

In addition, inorganic fiber cloth such as quartz fiber cloth, organic fiber paper such as cellulose fiber paper, highly heat-resistant N fiber cloth such as polyimide resin fiber cloth, etc. can be used in combination depending on the purpose. can. Semi-curing of the semi-cured IJ preg 3 generally refers to semi-curing of the semi-cured IJ preg 3
It is a four-piece type called a stage, which undergoes a hardening reaction when heat is applied, is not sticky to the touch, and can be placed one on top of the other.

As the metal cage 2 formed on the outer layer surface of the insulating layer 1, metal foils such as copper, nickel, aluminum, stainless steel, etc. are preferable, and copper foil is particularly preferable since it has good spiritual conductivity.

In this case, either electrolytic copper foil or rolled copper foil may be used, and there is no particular limitation.

Moreover, metal foils in which circuits are formed on these metal foils can also be used. In any of these cases, the thickness of the metal layer used is preferably 18 μm or less in order to form a fine circuit.

Next, the metal laminate N board A of the present invention is produced by stacking one or more of the Buri Preg 3, and applying 4 to 6
A metal foil 2 with roughened surfaces on both surfaces is arranged to have a surface roughness of μ-,
It can be obtained by applying pressure and heating. Generally, the metal foil is roughened on the adhesive surface 1 to improve adhesion with the prepreg, but in the present invention, the metal foil 2 is particularly roughened to a surface roughness of 4 to 6 μ- on both surfaces. The roughened surface of one side is used to increase the adhesion with the prepreg 3 as before, and the roughened surface of the gold B foil 2 exposed to the outside on the other metal-clad laminate A is heated by a drill. This prevents the cutting edge from slipping on the metal foil surface. Furthermore, when a plurality of such metal-clad laminates are stacked and drilled, it is possible to prevent these metal-clad laminates from shifting from each other. Next, the present invention will be explained with reference to Examples and Comparative Examples.

(Example) Example l Prominated epoxy tree B'8 (DER-5
11. 100 parts by weight of Eκ80 (manufactured by Dow Chemical),
3 parts by weight of ginandiamide (Daisai) as a curing agent and 2 ethyl 4 methyl imidazole (2 parts by weight) as a curing accelerator.
0.1 part by weight of E4MZ) and methyl ethyl ketone (MEK) as a solvent. Dimethylformamide (D
A glass cloth base material of specification 7628 was impregnated with a resin varnish made by blending 55 parts by weight of MF) equal star mixture 7 nights, and dried to obtain Bripreg 3 in which the resin was semi-cured. 4-6μ on both surfaces of the outer layer of 8 layers
Copper foil 2 with a thickness of 18 μm with both surfaces roughened to a surface roughness of m
was placed, and using a fume breath, the molding temperature was 170'C.
Lamination was carried out under the conditions of 100 minutes at a forming pressure of 50 kg/cm'', and a metal foil 2 roughened on both sides was arranged on the outer layer surface of an insulating layer 1 made up of prepreg 3, with a thickness of 1.6 mm. A double-sided copper-clad layer temporary A for printed wiring boards was obtained.

Using this double-sided copper-clad stack N tentative A, stack two 300 mm square double-sided copper-clad stacks rr3 tentative and place 1,
A 6m thick sacrificial plate was placed, and holes of φ0.35M were arranged in a grid pattern with a pitch of 1.27mm, and the number of revolutions was 8000 rpm.
Drilling was performed at a feed rate of 30 μ-/rev per revolution, and the deviation values of the holes drilled on the front side of the first sheet and the back side of the second sheet with respect to the reference hole were measured at 50 locations, and the results were recorded in the It is shown in Table 1.

Comparative Example 1 The same procedure as in Example 1 was carried out, except that the double-sided roughened metal foil of Example was changed to a non-roughened, smooth copper whistle with one surface finished with a rolling roll. Got the results.

From the results shown in Table 1 above, the metal clad laminates of Example 2, in which metal foils roughened on both sides were formed on the outer surface of the insulating layer, were layered and drilled to produce smooth, unroughened metal. Compared to Comparative Example 1 in the case of foil, the deviation from the reference hole is small, and the metal-clad laminate has good processing dimensional accuracy.
IE2 was completed.

(Margin below) Table 1 C Unit: μm [Effects of the Invention] The metal-clad laminate of the present invention has roughened metal 7δ formed on the outer layer surface of the insulating layer and is exposed, making it difficult to print. It can prevent the tip of the drill bit from slipping when using a drill to drill holes when processing into wiring boards, and it can also prevent the tip of the drill bit from slipping between metal-clad laminates when drilling multiple metal-clad laminates together. As a result, the dimensional accuracy of drilling with a drill can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The figure is an exploded view of the constituent materials before becoming the metal-clad la laminate of this invention. A...Metal-clad laminate 1...Insulating layer 2...Metal foil 3...Prepreg 1.1 Figure 2 Figure 2

Claims (2)

[Claims] (1) A metal-clad laminate characterized in that a double-sided roughened metal foil is formed on the outer surface of an insulating layer. (2) The surface roughness of the metal foil roughened on both sides is 4 to 6μ
The metal-clad laminate according to claim 1, wherein the metal-clad laminate is m.