JPH0243048A - Manufacture of multi-layer laminated board - Google Patents

Abstract

PURPOSE:To manufacture laminated boards, among which no fluctuation in quality presents, without impairing their productivity by a method wherein at lest two inner layer boards are positioned through a prepreg and laminated and, after being fixingly joined by means of ultraviolet-curing resin, formed with hot press. CONSTITUTION:Firstly, the predetermined number of sheets (at least two sheets) of inner layer boards (a), on the copper foil face of a copper clad laminate made of glass-filled epoxy resin or the like of each of which the predetermined circuit pattern is produced, are positioned through a prepreg b1 having preferably the same material as that of the copper clad laminate and laminated. At that time, ultraviolet-curing resin (c) are applied at the proper positions of the inner layer boards and/or the prepreg. By irradiating ultraviolet rays from the side of the laminated, the ultraviolet- curing resins are cured, resulting in fixingly joining the boards (a) and the prepreg b1 together so as to produce one set of laminate. Seven sets of laminate, between any two sets of which a stainless steel plate is interposed, are inserted between hotplates so as to be formed under heat and pressure with a hot press in order to manufacture multi-layer laminated boards. As a result, the positional accuracy of the board is favorable and the high quality can be kept on the board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for producing a high quality multilayer laminate with little misalignment.

[Prior art]

2. Description of the Related Art With the recent demand for higher performance of electronic devices, the use of multilayer boards having internal conductive metal foils of 1 rM or more is increasing as wiring boards on which electronic components are mounted.

Among these multilayer boards, for example, a six-layer board is constructed as shown in FIG.

That is, two inner layer plates 3 each having a metal conductor circuit 2 formed on both sides of an insulating layer 1 are prepared, the two inner plates 3 are stacked with a prepreg 4a interposed therebetween, and prepregs 4b are placed on both sides of each inner layer plate 3.
It has a structure in which a metal conductor foil 5 and a metal conductor foil 5 are sequentially stacked one on top of the other. The whole is integrally molded by hot pressing.

However, at this time, it is necessary to align the positions of the metal conductor circuits 2 of the two inner layer plates 3.3, and various methods have been used in the past.For example, there is the (a) bottle lamination method. , which consists of two sheets of W4 foil 5. as shown in Figure 2.
5; 3 prepregs 4.4.4; 2 inner layers 3.3
Drill holes for positioning in all of them, and attach them to the stainless steel plate 6.
．． After aligning by fitting all of these holes into the dowel pins 8 set up on the mold surface of the scissor mold 7.7 between the holes 6 and 7, the molding is performed by hot press.

In addition, after mechanically fixing the inner layer plate and the prepreg laminate with rivets or eyelets, they are integrally molded by heat press (b), or by using an instant adhesive such as cyanoacrylate to bond the inner layer plates together through the prepreg. There is also a method (c) in which they are adhesively fixed to each other and then integrally molded by heat pressing.

[Issues with conventional technology]

However, (a) the pin lamination method requires polishing the stainless steel plate after hot press molding to remove the pins and remove the resin attached around the pins, which significantly impedes productivity.

In addition, it is necessary to increase the thickness of the mold in order to absorb the difference in thickness before and after molding and to erect guide pins, which has the disadvantage of reducing workability and not being able to mold large-sized products. It also had the disadvantage of having to be opened.

In addition, the mechanical crimping method has the risk of rivets and dents damaging the stainless steel plate, often causing major problems in terms of quality control.

Furthermore, (c) a method using an instant adhesive such as cyanoacrylate does not have the problems of methods (a) and <o) mentioned above, but it is difficult to time the alignment work and the adhesive curing time, resulting in misalignment. This often occurred.

The method of the present invention has been made to solve these problems, and can produce multilayer laminates using at least two inner layers that require positioning among the inner layers without impeding productivity. The purpose is to provide a manufacturing method with no variation in quality.

[Means to solve the problem]

The method for manufacturing a multilayer laminate of the present invention includes, in manufacturing a multilayer laminate using at least two inner laminates, aligning and laminating at least two inner laminates with a prepreg interposed therebetween, and then applying an ultraviolet curing type. The gist of this invention is a method for manufacturing a multilayer laminate, which is characterized by fixing and adhering with resin and then molding by hot pressing.

Hereinafter, the present invention will be explained with reference to the drawings.

In the method of the present invention, for example, as shown in FIG. 3, a predetermined number of at least two inner layer plates a each having a predetermined circuit pattern formed on the IR foil surface of a copper-clad laminate made of glass epoxy resin or the like, A prepreg b1 preferably made of the same material as the copper clad laminate is interposed and laminated in alignment, and at this time, an appropriate location of the inner laminate and/or prepreg, preferably the periphery, that is, the end thereof, is coated with ultraviolet curable resin C. The mode of the end portion to be coated with resin is shown, for example, in FIG. It is not limited to this.

Next, the laminated inner plate and prepreg are aligned and laminated with ultraviolet rays from the side, thereby curing the ultraviolet curable resin and fixing and adhering them.

Next, similar prepregs b2, b2; copper 7id, d are superimposed on the outside of the adhesively fixed inner layer plate to obtain a laminate e. Thereafter, as shown in FIG. 4, multiple sets of this laminate e are assembled into stainless steel plates f, f, f------.
. . . is inserted between the heat parts of the heat press, heated and pressure-molded under predetermined conditions, and integrated.

Note that typical examples of the ultraviolet curable resin include epoxy acrylate, urethane acrylate, and polyester acrylate. Regarding the prepreg b interposed in the inner layer plate a, as shown in Figure 5-a, the inner layer plate may be cut out at the part coated with ultraviolet curable resin C, and the inner layer plates may be directly bonded to each other. do not have.

Furthermore, as shown in Figure 5-b, there is a method in which the ultraviolet curable resin C is applied to both sides of the space block h which can be deformed by press pressure and inserted between the inner plates 8, or only on the inner plate a side. A method in which a space block h coated with resin and a space block h not coated with resin may be inserted, or a method in which both the inner layer plate a and the space block h are coated with resin may be used.

In addition, the timing of irradiating ultraviolet rays to cure the ultraviolet curable resin does not necessarily have to be done immediately after positioning and laminating the inner layer plates with the prepreg interposed, but it can also be done after the outermost layer prepreg or copper foil is laminated. Of course, a plurality of these laminates may be stacked with stainless steel plates interposed therebetween.

[Examples] Examples and comparative examples of the present invention will be described below to explain the embodiments of the present invention in more detail.

Example 1 A predetermined inner layer circuit pattern was formed on the copper foil surface of a glass epoxy resin double-sided copper-clad laminate having a size of 5001111 x 50011 nm.Ultraviolet curing resin MT-A U- was applied to the edges of two inner layer boards obtained by forming a predetermined inner layer circuit pattern on the copper foil surface. 2004-2 (manufactured by Mitsui Toatsu Chemical Co., Ltd.) was applied, a prepreg with the same size as the inner layer plates and a notched inner layer joint was interposed between the two inner layer plates, and after alignment and lamination using the reference holes, The resin was irradiated with ultraviolet rays from the side to solidify and adhere firmly. Next, prepreg and copper foil of the same size as the inner layer board were superimposed on both sides, and this was made into a single laminate using the method shown in Figure 4. Seven sets of laminates were inserted between hot plates with stainless steel plates interposed between the various carcasses, and heated and pressure molded using a hot press to produce multilayer laminates.

Example 2 A predetermined inner layer circuit pattern was formed on the copper foil surface of a glass epoxy resin double-sided copper-clad laminate having a size of 500 mm x 500 mm. The edges of two inner layer boards were exposed to ultraviolet rays on both sides as shown in FIG. While piping a space block coated with hardening resin material - All-2004-2 (manufactured by Mitsui Toatsu Chemical) 2
A prepreg with the same size as the inner layer plates and a cutout at the joint of the inner layer plates is interposed between the two inner layer plates, and after alignment and lamination using the reference holes, ultraviolet rays are irradiated from the side to solidify the resin and fix it. Next, a prepreg and copper foil of the same size as the inner layer board were stacked on the side of the carcass, and this was made into one laminate using the method shown in Figure 4 with a stainless steel plate interposed between each carcass to form 7 sets. The laminate was inserted between hot plates and heated and pressed using a hot press to produce a multilayer laminate.

Comparative Example Using the same inner layer board, prepreg, and copper foil as used in Example 1.2, they were aligned and laminated by the pin lamination method as shown in Figure 2, and then inserted between hot plates and heated by hot pressing. Pressurized. Table 1 shows the results of measuring the positional accuracy between the inner layer plates for these Examples 1.2 and Comparative Examples.

(Measurement points A, B, C, D, and E correspond to the positions shown in Figure 6.) Table 1 Position accuracy measurement values (unit μ) As is clear from Table 1, position accuracy Regarding this, there is no difference in accuracy between the embodiment of the present invention and the comparative example showing the conventional method, and according to the present invention, compared to the conventional method, the groove can be easily obtained and the same as that obtained by the conventional cumbersome method. It can be seen that a highly accurate product can be obtained.

[Effects of the Invention] According to the present invention, the above-mentioned birch is laminated in advance and fixed with ultraviolet curing resin, so the positioning accuracy is good and the time required for fixing is short. It is said that its industrial applicability is extremely large, as it eliminates the need for molds and pins during hot pressing, significantly improving workability and productivity while maintaining high quality. It is inevitable.

Although the explanation and examples of the present invention with reference to the drawings are based on six layers, it goes without saying that similar effects can be obtained with eight or more layers.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view explaining the structure of the six-layer board, and Figure 2 is
FIG. 3, FIG. 4, FIG. 5-a, and FIG. 5-b are cross-sectional views explaining the present invention in detail. FIG. 2 is an explanatory diagram showing accuracy measurement points. Figure 7(a), Figure 7(b), Figure 7(C)
FIG. 2 is a plan view showing a position where an ultraviolet-effect resin is applied.

Claims (1)

[Claims] (1) When manufacturing a multilayer laminate using at least two inner laminates, at least the two inner laminates are aligned and laminated with prepreg interposed, and then fixed and bonded with ultraviolet curable resin. A method for manufacturing a multilayer laminate, characterized by molding by heat pressing.