JPS6292843A - Manufacture of glass cloth 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 continuous production of curable resin glass cloth reinforced electrical laminates. Here, electrical laminates refer to insulating laminates used as substrates for various electrical and electronic components,
A metal foil laminate used as a printed circuit board.

' ゛ and No. JP-A-55-4838 of the present applicant. 56-98136
et al. disclose a continuous manufacturing method for electrical laminates. In this method, a plurality of substrates are continuously conveyed in parallel, each i-substrate is individually impregnated with a curable resin liquid, the impregnated substrates are laminated and combined, and a cover sheet and/or metal foil is formed. It involves continuous processes such as laminating, continuously curing, and cutting.

In this method, when part or all of the base material includes multiple sheets of glass cloth, uneven tension in the width direction of the glass cloth being transported, meandering of the base material, bonding of the glass cloth, and applied resin may occur. Glass cloth tends to warp due to local uneven distribution of liquid, etc., and products that are laminated and cured in a crooked state are highly twisted, and it is difficult to correct it even by straightening it after it is made into a product. .

If the torsion is large, defects such as pattern misalignment are likely to occur during processing into circuit boards, leading to clogging on automatic lines and hindering production.

Therefore, the present invention has succeeded in manufacturing a laminate with a small amount of twist by a continuous method by suppressing the bending of the glass cloth substrate while it is being transported.

The present invention involves individually impregnating a plurality of base materials including at least two glass cloths with a curable resin liquid while continuously conveying them in parallel, and laminating and combining the impregnated base materials. death,
In a continuous manufacturing method for glass cloth reinforced electrical laminates in which a cover sheet and/or metal foil is laminated, continuously cured, and then cut, the bending of the glass cloth base material is suppressed to 20 mm/m or less. Provided is a continuous manufacturing method for a glass cloth reinforced electrical laminate, which is characterized by conveying the laminated board.

Here, the curvature of the glass cloth means that the intersection angle of the warp and weft yarns deviates from 90', and the amount of curvature means that the weft yarns deviate from the orthogonal position on the warp. It means the maximum number of liters of deviation. Therefore, for example, if the weft thread is deviated diagonally in a straight line, the amount of deviation between the ends of the weft thread is
In addition, if the weft thread is curved due to a pool of liquid,
It is the distance in the warp direction between the end of the weft thread and the curved apex.

In addition, the torsion of the laminate according to JIS C6481, 5, 4 has a strong correlation with the amount of warpage, and in reality, quality problems arise when there is a large difference between the maximum amount of twist and the amount of twist in the direction perpendicular to it. If the difference is small, it is possible to correct the twist by a correction method such as recurving, but if the difference is large, correction is difficult. Therefore, the amount of twist in the present invention is defined as the difference in the amount of warp in the diagonal direction.

According to the present invention, the bending of the glass cloth can be reduced by 20 m/
In order to suppress the grain size to less than m, it is necessary to select a raw material of glass cloth that has a small surface roughness. Even if such an original fabric with less curling is used, curling may occur during transportation, so it is necessary to suppress the amount to 20 m/m or less. There are several ways to do this.

In the continuous method, the substrate is conveyed with tension applied in the direction of conveyance. If this tension is small, it tends to meander, and if it is large, it tends to bend. Although a certain degree of tension is necessary to prevent meandering, unnecessarily large tension should be avoided as it may cause bending.

Additionally, in order to correct the meandering of the base material, it is customary to install an EPC device (edge, position, controller) at one or more locations between the unwinding of the base material and the lamination.
If the meandering is rapidly corrected, the glass cloth is likely to bend. Therefore, it is necessary to rapidly correct the meandering by slowing down the RPC feed speed, reducing the RPC roll holding angle, or installing RPC devices in two or more locations. Instead, it is gently corrected to suppress the occurrence of eye curvature.

If the applied resin liquid is locally distributed in large quantities (unevenly distributed and forms pools of liquid, it is easy to cause curling. Therefore, the pitch between the rolls that support the substrate is applied so that the amount of resin liquid applied is uniform and just the right amount. It is necessary to take measures such as making the path narrower, creating an upward slope in the transport path of the base material from the application section to the lamination section, and allowing excess resin liquid to flow down.

By using at least one of these means, preferably in combination of two or more, the bending of the glass cloth can be reduced by 2 times.
It can be suppressed to 0 m/m or less, preferably 10 am/m or less, more preferably 5 am/m or less. If the amount of curvature exceeds 20 squares/m, the product will be twisted so much that it will be difficult to correct it later.

The entire process and apparatus for manufacturing a laminate according to the present invention is disclosed in Japanese Patent Application Laid-Open No. 55-48, except as noted herein.
38. 56-98136 can be used.

According to the present invention, it is possible to use a plurality of sheets of glass cloth as a base material and to manufacture a curable resin glass cloth reinforced electrical laminate with little twisting by a continuous method.

Examples of the present invention are shown below.

EXAMPLE A single-sided copper foil-clad recombined composite +-a laminate plate with glass cloth (Nittobo WE-18K) placed on the upper and lower outermost sides and three layers of glass paper in the middle was manufactured by a continuous method.

While the base materials are continuously unrolled from the rolls and conveyed in parallel, 100 parts by weight of a commercially available unsaturated polyester resin (Polymer 6311, manufactured by Narita Pharmaceutical Co., Ltd.), 1 M part of benzoyl peroxide, and silica are individually applied to these base materials. 20
The impregnated base materials are laminated and combined, and an epoxy adhesive (Yuka Shell Epoxy, Epikote 828.65 parts by weight, Henkel Japan, Persamide 125.35 parts by weight) is applied. A copper foil with a thickness of 35 μm was laminated on the top surface and a polyester film was laminated on the bottom surface as a cover sheet, and the mixture was passed through a tunnel type curing furnace.
After curing at 00℃ for 20 minutes and cutting into 1m square pieces,
After curing at 160° C. for 20 minutes, a single-sided copper foil-clad laminate with a thickness of 1.6 mm was produced.

The relationship between the final rounding amount of the obtained laminate, the maximum amount of warpage, and the amount of twist is shown in the table below.

Claims (2)

[Claims] (1) While a plurality of base materials including at least two glass cloths are continuously conveyed in parallel, the base materials are individually impregnated with a curable resin liquid, and the impregnated base materials are laminated and combined. , in a continuous manufacturing method for glass cloth reinforced electrical laminates in which a cover sheet and/or metal foil is laminated, continuously cured and then cut, the bending of the glass cloth base material is suppressed to 20 mm/m or less. A continuous manufacturing method for glass cloth-reinforced electrical laminates, which is characterized by conveying the laminated sheets with glass cloth. (2) After supplying the curable resin liquid to the substrate, the first step transports the curable resin impregnated into the glass cloth substrate while preventing uneven distribution in the width direction and length direction until they are laminated and combined.
The method described in section.