JP2002172639A - Manufacturing method and manufacturing device for laminated plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce distortion generated when a laminated plate constituent material is cooled after being heated and pressurized, and reduce a warpage and a dimensional change due to the distortion. SOLUTION: The laminated plate constituent material 1 is pinched with panel boards 2, and is inserted in a press hot plate 3. After heating and pressurizing the laminated plate constituent material 1, the laminated plate constituent material 1 is cooled in the press hot plate 3. At this time, the temperature gradient at the time of the cooling is set in such a manner that the temperature gradient may become lower from the outside to the center. Then, on the press hot plate 3 which heats and pressurizes the laminated plate constituent material 1, a channel 5 is provided in such a manner that the laminated plate constituent material 1 may flow from the center to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a laminate.

[0002]

2. Description of the Related Art A laminated plate is manufactured by inserting a constituent material 1 into a press hot plate 3 with a head plate 2 interposed therebetween, and applying heat and pressure through a cushion member 4 (see FIG. 1B). When manufacturing an electrical insulating board, a prepreg obtained by impregnating a thermosetting resin with a base material such as paper or glass fiber cloth and semi-curing the resin is used as a constituent material, and when manufacturing a laminate for a printed circuit board. , Prepreg and copper foil are used as constituent materials, and when a laminated board for a multilayer printed circuit board is manufactured, the inner layer circuit board on which the inner layer circuit is formed, the prepreg and copper foil are used as constituent materials.

After the completion of heating and pressing, the obtained laminate is cooled while being pressed by a press hot plate 3 to prevent the product from warping. The heating and cooling by the press is generally performed by flowing steam or hot water into the flow path provided in the press hot plate 3 when heating and flowing water when cooling.
Heretofore, the flow path 5 provided in the press hot plate 3 has a simple structure in terms of equipment design, and the cooling water flows from the outside of the press hot plate 3 toward the center.

[0004]

The cooling water is supplied to the hot plate 3 by pressing.
When flowing from the outside to the center, the temperature gradient increases from the outside to the inside, so even though the center is in a state of expansion at a high temperature, it contracts from the periphery and strains the laminate. This causes warpage and subsequent dimensional changes during subsequent processing. An object of the present invention is to eliminate such disadvantages.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a laminated plate material 1 is inserted into a press hot plate 3 sandwiched between end plates 2, heated and pressurized, and then cooled in the press hot plate 3. Wherein the temperature gradient during cooling is reduced from the outside to the center.

[0006] The manufacturing method of the present invention is a laminated plate manufacturing apparatus (FIG. 1) in which a press hot plate 3 for heating and pressurizing a laminated plate material 1 is provided with a flow path 5 so as to flow from the center to the outside.
(A)).

Ideally, the flow path 5 is spiraled from the center to the outside as shown in FIG. 1 (c). However, since it is difficult to process the flow channel, the shape shown in FIG.

[0008]

In the case of forming a large number of laminates by laminating the laminate constituting material 1 and the end plate 2 alternately and further heating and pressurizing the cushions 4 on both sides thereof, about 150 ° C. from room temperature to the maximum temperature. Temperature change. At the time of this temperature change, a difference occurs in the amount of thermal expansion of each material due to the difference in the coefficient of thermal expansion.

There is no problem if all the materials contract in a free state in the cooling process. However, even if the cooling water is passed through the press hot plate 3, the length of the water passage is long. This produces a temperature difference of 10 ° C. At this time, when cooling water is passed from the peripheral portion of the hot plate, cooling starts from the peripheral portion of the laminate, and contracts from the peripheral portion even though the central portion is expanded at a high temperature. Start, distortion remains in the product. This causes warpage and dimensional change.

In the present invention, the cooling water flows from the center of the press hot plate 3 and is cooled from the center, so that the shrinkage of each material shifts smoothly from the center to the periphery. As a result, no distortion remains, and warpage and dimensional change can be reduced.

[0011]

EXAMPLE An epoxy resin prepreg having glass cloth (NEMA standard 7628 type) as a base material is laminated on eight sheets, and electrolytic copper foil having a thickness of 18 μm is arranged on both sides thereof. A copper-clad laminate was manufactured as one press. The press used had a flow path as shown in FIG. 1A, and was heated and pressurized at a temperature of 170 ° C. and a pressure of 4 MPa, and then cooled by passing cooling water through the center of the press hot plate.

Comparative Example A copper-clad laminate was manufactured under the same conditions as in the example, except that a press having a structure in which cooling water was passed from the periphery of the hot plate was used.

The obtained copper-clad laminate has a thickness of 330 mm.
A sample having a size of × 250 mm was prepared, and its warpage and dimensional change were examined. Table 1 shows the measurement results. Dimensional change is JIS
The measurement was performed according to the method specified in C6481.

[0014]

[Table 1] Note) Dimensional change (+) indicates expansion and (-) indicates contraction.

[0015]

By using a press equipment that starts cooling from the center of the laminate, residual strain can be prevented,
Warpage and dimensional change can be reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein (a) and (c) are plan views showing an example of a flow path, and (b) is a schematic view of a press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated board constituent material 2 End plate 3 Press hot plate 4 Cushion material 5 Flow path

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Naoki Teramoto 1500 Ogawa, Oji, Shimodate-shi, Ibaraki F-term in the Shimodate Works of Hitachi Chemical Co., Ltd. (reference) 4F204 AA39 AD03 AD04 AD15 AG01 AG03 FA15 FB01 FB12 FN16

Claims (4)

[Claims] 1. A method for manufacturing a laminated plate, in which a laminated plate constituent material is inserted into a press hot plate sandwiched between end plates, heated and pressurized, and then cooled in the press hot plate, the temperature gradient during cooling is:
A method for manufacturing a laminated board, wherein the temperature of the laminate is reduced from the outside to the center. 2. An apparatus for manufacturing a laminated plate, comprising a press hot plate for heating and pressurizing a laminated plate forming material, and a flow path provided so as to flow from the center to the outside. 3. After etching the entire surface of the copper-clad laminate,
After a constant temperature treatment at 50 ° C. for 0.5 h, JIS C 6481
The dimensional change when measured in accordance with the method specified in 1.
A copper-clad laminate characterized by being less than 013%. 4. A copper-clad laminate of 330 mm × 250 mm is subjected to a constant temperature treatment at 150 ° C. for 0.5 hour, and then JIS C648.
The amount of warpage when measured according to the method specified in 1.
A copper-clad laminate characterized by being less than 6 mm.