JPH01123732A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain the laminated sheet including no air bubbles even when curing time is reduced by a method in which the required number of the resin- impregnated bases impregnated with the resin deaerated under reduced pressure by a high speed rotation type film-deaerating device, are lapped on long bandlike bases, and the laminate in which long bandlike foils are arranged on said upper and/or lower surfaces, is cured continuously under a prescribed pressure. CONSTITUTION:Seven resin-impregnated bases 3 impregnated with the unsaturated polyester resin 2 containing benzoyl peroxide deaerated under reduced pressure by a drum type film-deaerating device, are lapped on the upper surfaces of long glass fabrics 1. The long laminate 5 in which a long copper foils 4 are arranged oppositely to the bases 3 impregnated with resin on said upper and lower surfaces, is continuously laminated, while excessive impregnating resin is squeezed by squeezing rolls 6. The long laminate 5 is passed through a curing furnace 7 by pulling out rolls 8, and is heated under atmospheric pressure or the pressure of 40kg/cm<2> or less, and then is continuously cured. The cured long laminate 5 is cut into a desired dimension by a cutter 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a laminate used in electronic equipment, electrical equipment, computers, communication equipment, etc.

[Background technology]

Conventionally, laminates used in electrical equipment, etc., are made of a resin-impregnated base material and metal foil, and are pressed for a long period of time (1
(~2 hours) Because it is obtained by heat-pressing molding, even if the air bubbles contained in the resin remain as residual bubbles in the resin-impregnated base material, they will not be removed from the laminate by long-term heat-pressing molding. Since the resin was discharged, no air bubbles remained in the cured laminate, and a dense laminate was obtained. However, if laminates are to be produced continuously, it is actually impossible to spend a long time in the curing process because the equipment would be too long.

For this reason, it is necessary to use a resin with an extremely short curing time, or to cure it to a degree that allows it to be cut, then cut it to the required size, and then further after-cure the laminate to ensure complete curing. is carried out. However, no matter which method is used, it is impossible to discharge the residual air bubbles in the resin-impregnated base material to the outside of the laminate due to the air bubbles contained in the resin.

Air bubbles within the laminate will severely reduce its moisture resistance and will have a significant negative impact on the water, plating solution, and cleaning fluid used when processing the laminate into printed wiring boards.
This is a big problem since it reduces reliability during use.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a laminate without incorporating air bubbles.

[Disclosure of the invention]

The present invention consists of stacking a required number of resin-impregnated base materials impregnated with resin that has been degassed under reduced pressure using a high-speed rotating thin film foaming device, and further covering the upper and/or lower surfaces with long strip-shaped metal foils. Because the method for manufacturing laminates is characterized by continuously curing the long laminate with the particles transferred and then cutting it to the required size, there are no air bubbles in the resin. Since air bubbles also exist within the resin-impregnated base material, we were able to obtain a single laminate with no built-in air bubbles even though the curing time was shorter than that of the conventional multi-stage press method. The present invention will be described in detail.

Long strip-shaped substrates used in the present invention include glass-based substrates such as glass cloth, glass paper, and glass nonwoven fabric, as well as paper 1 synthetic fiber cloth, synthetic fiber nonwoven fabric, asbestos vapor,
Cotton cloth etc. are used, but preferably thick glass cloth, glass paper, glass non-woven fabric etc. with thickness adjustment effect are used.
Desirably, the 10 resins include unsaturated polyester resins (%V), vinyl ester resins, Evo aP-V acrylate resins, Evoki V resins, phenolic resins, melamine resins, etc. Alone.

Mixtures, modified products, etc. can be used, and the resin may be impregnated with only the same resin, but similar resins or different resins can be used.
From C, the primary impregnation is done with a resin that has a lower viscosity.The secondary impregnation is done with a resin that has a higher viscosity than the primary impregnation, so that more uniform impregnation can be achieved. A crosslinking agent, a polymerization initiator, a crosslinking agent, a polymerization initiator, a diluent, etc. can be added thereto, and if necessary, additives such as an inorganic powder filler, a short edge filler, a fiber filler, etc. can also be added. The above-mentioned resin is not used as it is, but must be defoamed under reduced pressure using a high-speed rotating thin film defoaming device before being incorporated. The rotating plate of a high-speed rotating thin film defoaming device may have only one stage, but
If necessary, it can be made into multiple stages. Metal foils include copper, aluminum rough, iron, stainless steel,
A single or composite foil of 21 Kel, zinc, brass, etc. is used, and if necessary, a piece of metal foil ff1Jc adhesive layer is provided.
It is also possible to further improve adhesiveness. Curing time and curing temperature vary depending on the type of resin and can be selected depending on the resin used. The pressure applied during curing is preferably from no pressure to 40Ktv'd-, and can be selected depending on the resin used.

An embodiment of the present invention will be explained below based on the illustrated embodiment.

Example IF1 Figure is a simplified process diagram showing an example of the m* method for laminated plates of the present invention, and Figure IF5 is a simplified sectional view showing an example of the high-speed rotary thin film defoaming device used in the present invention. be.

As shown in Fig. 1, benzoyl peroxide-containing unsaturated polyester resin 2, which has been defoamed under reduced pressure using a drum-type thin film degassing device, is cast from the top surface of a long glass cloth l with a width of 111 m and a thickness of 0.2 mm. 301 sheets of impregnated resin-impregnated base materials were stacked, and the upper and lower surfaces and the adhesive side of a long length of adhesive-coated copper foil 4 having a width of 1 m and a thickness of o and oss m were made to face the resin-impregnated base material 3. The arranged long laminates 5 are continuously stacked one on top of the other while squeezing out excess impregnated resin with a squeeze roll 6, and sent to a curing furnace 7.

At the outlet of the curing furnace 7, a pair of upper and lower pull-out rolls 8 for transferring the elongated laminate 5 are provided. The elongated laminate 5 is transferred by this pull-out roll 8 and passed through a curing furnace 7, and during one pass, it is heated in the curing furnace 7 under no pressure to be continuously cured. After pulling out the cured long laminate from the curing furnace 7 with a pull-out roll 8, it is cut into 1.6 m thick pieces by a force cutter 9 every 1 m.
1. A double-sided steel-clad glass cloth base unsaturated polyester resin laminate of 1llxlsw was obtained. The vacuum degassing resin used in the present invention was obtained in the following manner using a high-speed rotary thin film defoaming device. Ta. As shown in Figure 2, there is a high-speed rotating disk 10 inside.
When the unsaturated polyester resin containing pecizoyl peroxide is supplied to the supply port 11 of the high-speed rotating thin film defoaming device that houses the oscilloscope, the resin drips onto the center 12 of the high-speed rotating disk IO, and the peripheral edge of the high-speed rotating disk 10 is exposed to the centrifugal force. It becomes a thin film toward the cram school, scatters from the first periphery U, adheres to the inner wall 14 of the container, becomes thin again on the surface of the inner wall 14 of the container, and is quickly sent to the outlet. The inside of the apparatus is under reduced pressure, and the high-speed tatting disk 10 can be heated if necessary.

Comparative Example A laminate was obtained in the same manner as in the Example except that the A fat of the Example was used without degassing under reduced pressure.

〔Effect of the invention〕

As is clear from Table 1, the performance of the laminates of Examples and Comparative Examples obtained by the method of the present invention was good;
It was confirmed that the method for producing a laminate according to the present invention is superior.

[Brief explanation of the drawing]

Fig. 1 is a simplified process diagram showing an embodiment of the method for producing a laminate according to the present invention, and Fig. 2 is a simplified sectional view showing an embodiment of the high-speed rotary film defoaming device used in the present invention. be. 1 is long base material % 2 is resin, 3 is resin-impregnated base material, 4 is gold f
144* s is a long laminate, 6 is a squeeze roll, 7 is a curing furnace, 8 is a pull-out roll, 9 is a cutter, U is a high-speed rotating disk, U is a resin supply port, L2 is the center of the disk, and the mouth is the disk periphery 14 is the inner wall of the container, and 15 is a resin discharge port.

Claims (2)

[Claims] (1) A required number of resin-impregnated base materials impregnated with resin defoamed under reduced pressure using a high-speed rotary thin film degassing device are stacked on a long strip-shaped base material, and a long strip-shaped metal foil is further placed on the upper and/or lower surfaces of the resin-impregnated base materials. A method for manufacturing a laminate, which comprises curing the long laminate continuously while moving the laminate, and then cutting the laminate into required dimensions. (2) Pressure applied during curing ranges from no pressure to 40 kg/cm^
2. The method for manufacturing a laminate according to claim 1, wherein: