JPH0447910A - Manufacture of metal foil clad laminated sheet - Google Patents

Abstract

PURPOSE:To prevent minute frictional scratches on the metal foil surface from developing and, at the same time, reduce warpage by a method wherein the difference between the thermal expansion coefficients of the metal foil and of a mirror plate is specified at the pressing of laminated materials, each of which is prepared by piling up the predetermined number of resin impregnated paper cloths and arranging metal foils. CONSTITUTION:Between the upper and the lower hot plates 4 of a press, laminated materials 3 and mirror plates 6 are alternately piled up under the condition that cushioning materials 5 are arranged so as to come into contact with the upper and the lower hot plates respectively. Each laminated material 3 consists of resin-impregnated paper cloths piled up one another and metal foils laminated to both the sides of said piled up cloths. The difference between the thermal expansion coefficients of the metal foil and of the metal mirror plate 6 is set to be 3x10<-6> or less. If somewhat friction develops, minute unevenness of the mirror plate surface or extraneous matter makes the cause for enlarging scratches. On the other hand, the nearest laminated sheet to the hot plate 4 is subjected to large bending force especially at cooling so as to be warped convex to the hot plate 4. Accordingly, by making the thermal expansion coefficient of the mirror plate 6 larger so as to approach to that of the metal foil, the expansion and contraction of the mirror plate 6 overcomes the bending force of the cushioning material 5, resulting in causing no strain to the laminated sheet and making the warpage of the laminated sheet smaller.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing a metal foil-clad laminate that does not produce friction scratches on the metal foil surface and has less deformation [Prior Art] Metal foil cladding The horizontal laminate is manufactured by stacking a predetermined number of M8 oil-impregnated paper cloth sheets, and then alternately stacking a laminated material with metal foil on one or both sides and a metal mirror plate.

By heating and press forming between hot plates of a press.

The above metal mirror plate has a coefficient of thermal expansion of 10 to 12X10.
Stainless steel is used, and the thermal expansion coefficient is 16 for the metal A recess.
It is common to use m-folds of ˜17×10−′. Therefore, due to the difference in thermal expansion between the bottom shape Q of the breather and the bottom plate, friction 11I is caused in the contact Ifi between the end plate and the @notice, which is similar to the slight scratches on the copper foil surface of the steel clad laminate. It is about. In addition, a large number of aI# plates are formed between the press hot plates, but the warpage of the J-shaped laminated plates is different at that position, and the warp of the hammer plate near the hot plate is large.

As a countermeasure for the above, it is necessary to use Clan carbon material which is conveniently used between the heating plate and the capacitor plate.
By layering another cast plate on one plate with a similar fi
J-Saving is being done.

[111 #I to be solved by the invention] The conventional method of reducing fine J-bank scratches that occur on the surface of steel foil with 71 rubber material is not only insufficiently effective, but also has problems with pressure distribution and rise. There is a drawback that voids are generated due to temperature differences.

Also, the method of attaching an additional mirror plate kM to the mirror plate closest to the heating plate is as follows:
The problem is a decrease in work efficiency due to the increased number of cast plates used.

In view of the above-mentioned problems, the present invention has been developed to solve the problems described above.
[The purpose is to provide a method for disposing metal foil-clad laminates with no scratches and less warpage.]

[Means for solving problem a]

In order to achieve the above-mentioned purpose, the invention is based on a laminated material in which a predetermined number of seven sheets of paper cloth impregnated with ballast are placed on a bed, and a laminated material with gold #I foil arranged on one or both sides, a gold S-plate, and a t-layer are mutually connected. In the production of laminates, which are stacked on top of each other and heated and pressed between the hot plates of a press, the difference between the heat I# number of blinds of gold JfI foil and the coefficient of thermal expansion of a single metal sheet is f5X10 or less. This is the manufacturing method.

Fig. 11 shows the internal structure of the press hot plate during the production of the laminate, and Fig. 2 shows the structure of the laminated materials. At the upper and lower hot plates 4 of the press, the material 3 and the mirror plate 6 are all alternately placed, and the cushions are placed in contact with the upper and lower hot plates 4. The various layer materials 3 are resin-impregnated paper cloth t. Moreover, metal foil is layered on both sides to fit it.

The S configuration of the present invention will be explained in more detail.

Since the thermal tensile coefficient of commonly used steel foil is 17X10-', if the gold JK mirror plate is made of stainless steel, the warpage thermal expansion coefficient is usually 14 to +9XTO-', and the difference is 3XTO-'. −' or less. The copper foil must be made of steel for use as a circuit, and has a warpage coefficient of thermal expansion of 17X10-'t.
-If constant, the thermal tensile coefficient is 16 to 18 x 70-
(1) It is preferable to choose a stainless steel leg plate.The thickness of the stainless steel head plate is preferably 1.0-5 Qau*.

[Effect]

The smaller the difference in thermal expansion coefficient between the metal plate and the end plate that come into contact during pressing, the better! j-Jl 0-meat with less occurrence of scratches,
If some friction occurs, curves, irregularities, or deposits on the foundation plate surface will cause the scratches to become larger.On the other hand, regarding warping, the copper plate may be moved in the plane direction from the cushioning material trap during heating and pressurization. When the laminate is in a restraint capacity, the laminated plate closest to the hot plate receives a large restraining force during cooling, causing a warpage that becomes convex with respect to the hot plate. For this reason, if the heat absorption coefficient 7 of the cast plate is increased to approach the thermal expansion coefficient of metal foil, the E tension and contraction of the cast plate will be affected by the restraining force of the cushion material, causing ``CC strain'' to the laminate. Since there is no slippage, the process becomes smaller. [Actual example] (Example 1) Glass cloth (NEMA current 7628 tie 7) is impregnated with epoxy S1 resin and dried. 10 sets of laminated materials with suspensions are alternately stacked with stainless steel hard plates with thermal expansion coefficients of 1 &5XIQ-'.
Set it to z5 as shown in the figure, insert it between the hot plates, and heat it to 170℃.
0kl! /cl Tejijl Heat Pressure Sheet *JlII In the example, the difference in thermal expansion coefficient between the steel cavity and the single plate is α5×10.

(Example 2) The procedure was the same as in Example 1 except that a stainless steel hard plate having a coefficient of thermal expansion of 14×10 −′ was used. This four so.

Thermal coefficient difference is 5X10-@1" (Comparative Example 1) P, expansion coefficient is 1 (L5X10 Suanless f
I'm using the II4 prisoner board! Same as Example 1. In this case, the heat * gk number difference t In this case, the difference in thermal expansion coefficient is 5X10-' (Test) The double-sided steel clad laminates with 1 and 6 axial thicknesses obtained in the above examples and comparative examples were molded with 7 layers closest to the hot plate. Laminated board A
Table 1 shows the appearance of the hanging surface of the laminate B formed at the center between the hot plates and the custom warp. Crafting a sled violet.

Etched the entire surface of a 500x500ffi test piece,
160℃, 30 minutes 11JPflt(1) anti')'tJ
Measured by Is C6481.

Table 1 [Effects of the invention] Heat of copper foil and cast plate! #In the example of the present invention where the tensile modulus difference was t-3X10-' or less, no scratches were generated on the copper foil surface regardless of the position between the hot plates, whereas in the comparative example of the conventional method no scratches were generated on the copper foil surface. t occurs 0 horizontal 1 plate warp 1 fruit of the present invention! In the case of S.

Less, regardless of the position between the hot plates. Contrary to this rL℃.

The warpage of the conventional method is large at the position close to the hot plate at 1 o'clock.

[Brief explanation of the drawing]

Figure 1 shows #lI formation during lamination molding between press hot plates. FIG. 2 shows the removal of the laminated material. 1... Gold IT4 foil, 2...
Resin-impregnated paper cloth. 3... Laminated material, 4... Hot plate. 5...Kutushiran material, 6...Metal piece board0 Agent Patent attorney Hirohiro tl Figure 2

Claims (1)

[Claims] 1. A laminated material in which a predetermined number of resin-impregnated paper cloths are stacked and metal foil is arranged on one or both sides and a metallic end plate are stacked,
In the production of laminates that are heated and pressed between the hot plates of a press, the difference in thermal expansion coefficient between the metal foil and the metal mirror plate is set at 3 x 10.
A method for manufacturing a metal-clad laminate, characterized in that the thickness is ^-^6 or less.