JPS6292842A - Manufacture of glass fiber reinforced electric laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing a glass fiber reinforced electrical laminate using a glass fiber fabric as a base material.

Here, the electrical laminate refers to an insulating laminate used as a substrate for various electrical and electronic components, and a metal foil-covered laminate used as a printed circuit board.

Japanese Patent Publication No. 55-4838. 56-98136
et al. disclose a continuous manufacturing method for electrical laminates. This method involves impregnating a plurality of substrates individually with a curable resin liquid while continuously conveying them, combining the impregnated substrates, laminating a cover sheet and/or metal foil, and continuously It involves continuous processes such as curing and cutting.

When manufacturing a laminate using glass fiber fabric as part or all of the base material using this method, it is particularly necessary to fill the curable resin liquid with filler to impart properties such as dimensional stability and flame retardancy. In this case, it may be difficult to impregnate every corner of the base material with the resin liquid due to an increase in the viscosity of the resin liquid, clogging of glass fibers by the filler, etc. If every corner of the base material is not impregnated with the resin liquid, voids such as air bubbles will remain in the product, which will cause a decrease in properties such as heat resistance. This problem can be avoided if the resin liquid is supplied to the substrate by coating, etc., and then allowed for a long enough time to naturally penetrate into every corner of the substrate, but such a solution will reduce the overall line speed. This is not desirable as it slows down the line and makes the line unnecessarily long.

Therefore, the present invention has succeeded in actively promoting the impregnation of the resin liquid into the base material by applying a bending motion to the base material after supplying the resin liquid, and shortening the completion time. .

The present invention involves impregnating a plurality of base materials including glass fiber fabric individually with a curable resin liquid while continuously transporting the base materials, combining the impregnated base materials, and forming a cover sheet and/or In a continuous manufacturing method for glass fiber-reinforced electrical laminates in which metal foil is laminated, continuously cured, and then cut, a curable resin liquid is supplied to a glass fiber fabric base material, and then the base material is placed on a rotating roll. Provided is a continuous manufacturing method for a glass fiber-reinforced electrical laminate, characterized in that a bending motion is imparted to the base material by conveying the base material along the base material.

PREFERRED EMBODIMENT OF THE INVENTION According to the present invention, the arrangement of rotating rolls for imparting bending motion to the substrate after supplying the resin liquid to the substrate being conveyed will be explained with reference to the drawings. In the example shown in FIG. 1, after the resin liquid is applied to the substrate 1 being conveyed, it is bent about 180 degrees on the first rotating roll 2, and then bent in the opposite direction on the second rotating roll 3. It is bent again by about 180 degrees. In this way, when viewed from the side, the bending angle of the base material is 90° to 180°.
Here, the case where the angle is within the range of 0.2° is referred to as inversion. In the example shown in FIG. 2, the sheet is conveyed along a plurality of rotating rolls 4 to 7 arranged in a zigzag pattern and bent several times in opposite directions. In this way, it is preferable to bend the substrate by bringing both sides of the substrate into contact with the rotating roll in sequence and bending the substrate at least twice in opposite directions, since this increases the impregnation rate.

Rolls 2.3 and 4-7 etc. should be installed so that they can rotate freely. Japanese Patent Laid-Open No. 52-99398 proposes bending the base material by sliding it on a fixed iron after supplying a resin liquid. However, the resin liquid stays in front of the sliding point, increasing the viscosity and causing the base material to bend. The resistance between the material and the fixed iron increases, causing the glass cloth to bend, causing warping, twisting, etc. of the product.

The viscosity of the impregnating resin liquid also affects the impregnation rate, and the impregnation rate slows down in proportion to the viscosity, so the viscosity is 0.1 to 1 at room temperature.
Preferably, it is within a range of 5 poise.

The application of the bending motion according to the present invention to the substrate after supplying the resin liquid must be applicable to all the glass fiber fabric substrates used, but it cannot be applied to other substrates such as glass paper, cellulose-mixed glass, etc. Paper, cellulose paper, etc. are optional.

Also the whole process and equipment for laminate production is
Except for matters noted here, Japanese Patent Application Laid-Open No. 55-4838.
56-98136 can be used.

According to the present invention, in the continuous manufacturing process of a laminate,
Since the rate of impregnation of the resin liquid into the glass fiber fabric base material, that is, the time required for the resin liquid to wet the surface opposite to the applied surface, can be accelerated, a decrease in line speed or an increase in line length can be avoided. Furthermore, since the glass fiber fabric does not bend, a product with less warpage, twisting, etc. can be obtained.

Examples of the present invention are shown below.

Example 1 Five sheets of glass cloth (Nittobo E-18K) were continuously fed out from a roll, and individually coated with commercially available unsaturated polyester resin (Takeda Pharmaceutical Co., Ltd., Bolimar 631).
1) 100 parts by weight, benzoyl peroxide lff1
After thoroughly mixing 20 parts by weight of silica, a resin solution that had been degassed under reduced pressure was applied, and the resin solution was reversely bent twice using rotating rolls arranged as shown in Fig. 1 to form a roll with a diameter of 30 mm for impregnation. 2 line speed 50cm/min, impregnation distance 1
．． 5m), then combined, laminated with a polyester film as a cover sheet on the top and bottom surfaces, passed through a curing oven and cured at 100°C for 20 minutes, cut and post-cured at 160°C for 20 minutes to a thickness of 1.5m). An On+ unclad laminate was manufactured.

Example 2 The conditions were the same as in Example 1, except that the four rotating rolls with a diameter of 30 fins used in Example 1 were arranged as shown in Figure 2, and a bending motion was applied to the base material after the resin liquid was supplied. and thickness 1. Omm unclad laminates were manufactured.

Comparative Example 1 A laminate was manufactured under the same conditions as Example 1, except that no bending motion was applied to the base material after the resin liquid was supplied.

Comparative Example 2 In Example 2, instead of the rotating roll, JP-A-52-
A laminate was manufactured under the same conditions as in Example 99398, except that the fixing iron was arranged as shown in FIG. 2, and the base material was slid on the fixing iron.

The table below shows the time required for wet-through, the horizontal conveyance distance until wet-through, and the amount of twist of the product in Examples and Comparative Examples.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of rotating rolls for imparting bending motion to a substrate after resin liquid has been supplied according to the present invention, and FIG. 2 is a schematic diagram showing another arrangement of the rotating rolls. 1 is a glass fiber fabric base material, and 2 to 7 are rotating rolls. Patent applicant Kanebuchi Chemical Industry Co., Ltd. - Figure 1 Figure 2

Claims (3)

[Claims] (1) While continuously conveying a plurality of base materials including glass fiber fabric, impregnate the base materials individually with a curable resin liquid, combine the impregnated base materials, and combine the base materials with a cover sheet and/or metal In a continuous manufacturing method for glass fiber-reinforced electrical laminates in which foils are laminated, continuously cured, and then cut, a curable resin liquid is supplied to a glass fiber fabric base material, and then the base material is rolled along a rotating roll. A continuous manufacturing method for a glass fiber reinforced electrical laminate, characterized in that a bending motion is imparted to the base material by conveying the base material. (2) The method according to item 1, wherein after supplying the curable resin liquid to the glass fiber fabric substrate, the substrate is turned over at least twice on a rotating roll. (3) Item 1 or 2, wherein the curable resin liquid does not contain a solvent and can be cured without generating volatile by-products, and has a viscosity of 0.1 to 15 poise at room temperature. The method described in Section 2.