JPH069910B2 - Manufacturing method of glass cloth reinforced electrical laminates - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a continuous production method of a curable resin glass cloth reinforced electrical laminate. Here, the electrical laminate is an insulating laminate used as a substrate for various electric and electronic components,
It means a metal foil-clad laminate used as a printed circuit board.

BACKGROUND ART AND PROBLEMS JP-A-55-4838 and 56-98136 of the present applicant.
Et al. Disclose a continuous production method of electrical laminates. In the method, a plurality of base materials are continuously conveyed in parallel, and the base materials are individually impregnated with a curable resin solution, and the impregnated base materials are laminated and combined to form a cover sheet and / or a metal foil. Laminating, continuously curing, and cutting, and the like.

When a part or all of the base material in the method includes a plurality of glass cloths, the tension is made nonuniform in the width direction of the glass cloth being conveyed, the base material meanders, the glass cloths are joined,
The glass cloth is liable to be bent due to localized uneven distribution of the applied resin liquid, and the cured product is laminated and hardened. Have difficulty.

If the twist is large, a defect such as a pattern shift is likely to occur when descending to the circuit board, and clogging occurs on the automatic line, which is an obstacle to production.

Solution To solve the problem, the present invention succeeded in producing a laminated plate having a small amount of twist by a continuous method by suppressing the bending of the glass cloth substrate being conveyed.

According to the present invention, a plurality of base materials including at least two glass cloths are continuously conveyed in parallel and the base materials are individually impregnated with a curable resin solution, and the impregnated base materials are laminated and united. Then
In a continuous manufacturing method of a glass cloth reinforced electrical laminate, which comprises laminating a cover sheet and / or a metal foil, continuously hardening it, and then cutting the same, using a glass cloth raw material with little bending and using a glass cloth base during transportation. By controlling the tension and meandering correction of the material appropriately and preventing the impregnated resin from being locally unevenly distributed, the glass cloth base material is conveyed while suppressing the bending of the glass cloth base material to 20 mm / m or less. The present invention provides a continuous production method of a glass cloth reinforced electrical laminate.

Preferred Embodiment Here, the warp of the glass cloth means that the intersecting angle of the warp yarn and the weft yarn is deviated from 90 °, and the amount of the warp is defined by how many mm the weft yarn deviates from the orthogonal position on the warp yarn at the maximum. means. Therefore, for example, when the weft thread is linearly displaced, it is the amount of displacement between the ends of the weft thread,
If the weft is bent due to liquid pool, etc.,
It is the distance in the warp direction between the end of the weft thread and the curved apex.

In addition, the twist of the laminated plate according to JIS C 6481.5.4 has a strong correlation with the amount of warp, and the actual quality problem is when the difference between the maximum twist amount and the twist amount in the perpendicular direction is large. Yes, if the difference is small, it is possible to correct the twist by a correction method such as warping, but if the difference is large, it is difficult to correct. Therefore, the twist amount in the present invention is defined as the difference in the warp amount in the diagonal direction.

According to the present invention, in order to suppress the bending of the glass cloth to 20 mm / m or less, it is necessary to select a glass cloth having a small amount of bending itself. Even if such a raw material having a small amount of bending is used, the bending may occur during the transportation, so it is necessary to suppress the amount to 20 mm / m or less. There are several methods.

In the continuous method, the substrate is conveyed by applying tension in the conveying direction. If this tension is small, it is easy to meander, and if it is large, bending is likely to occur. It is necessary to some extent to prevent meandering, but excessive tension should be avoided as it will bend the eyes.

Further, in order to correct the meandering of the base material, it is customary to install one or more EPC devices (edge, position, controller) between the feeding of the base material and the stacking,
If the meandering is abruptly corrected, the glass cloth is likely to be bent, so that the EPC feeding speed is slowed down, the holding angle of the EPC roll is reduced, and the EPC device is installed at two or more places. Rather than making a gradual correction, it suppresses the occurrence of eye bending.

A large amount of the applied resin liquid is locally unevenly distributed, and when a liquid pool is formed, eye bending is likely to occur. Therefore, apply the resin liquid evenly and without excess or deficiency, narrow the pitch between the rolls supported by the base material, give an upward slope to the transfer path of the base material from the coating part to the laminating part, and add excess resin. It is necessary to take measures such as allowing the liquid to flow down.

By using these means in combination, the bending of the glass cloth is 20 mm / m or less, preferably 10 mm / m.
Hereafter, it can be suppressed to 5 mm / m or less, more preferably. If the amount of warp exceeds 20 mm / m, the product will be greatly twisted and difficult to correct later.

The whole process and apparatus for producing a laminate according to the present invention is, except for the matters specially mentioned herein, disclosed in JP-A-55-48.
38, 56-98136.

According to the present invention, a plurality of glass cloths are used as a base material, and a curable resin glass cloth-reinforced electrical laminate having less twist can be manufactured by a continuous method.

Examples of the present invention will be shown below.

Example A single-sided copper foil-clad composite laminated plate having glass cloth (Nitto Bosh WE-18k) on the upper and lower outer sides and three layers of glass paper in the middle was manufactured by a continuous method.

100 parts by weight of a commercially available unsaturated polyester resin (Takeda Yakuhin, Polymer 631), 1 part by weight of benzoyl peroxide, and silica are individually fed to these base materials while continuously feeding them out from a roll and conveying them in parallel. 20 parts by weight of a resin solution is impregnated, and the impregnated base materials are laminated and combined to form an epoxy adhesive (Okaka Shell Epoxy, Epicoat 82
8,65 parts by weight, Henkel Japan made, Versamide 125, 35
(Weight part) is applied to a copper foil having a thickness of 35μ on the upper surface, and a polyester film as a cover sheet is laminated on the lower surface. After curing at 160 ° C. for 20 minutes, a single-sided copper foil-clad laminate having a thickness of 1.6 mm was manufactured.

At this time, tension of the glass cloth base material, resin impregnation method, E
The setting of the PC roll was variously changed, and the effects on the bending, warpage and twist were examined. The conditions and results of each experiment are shown in the table below. Experiment Nos. 1, 4, 6 and 8 are examples of the present invention, and others are comparative examples. The initial bending of the glass cloth used was all 1.5 mm / m, and the rolls during the process were centered as much as possible.

(Note 1) Impregnation method (1) Since a large excess of resin liquid was applied, resin lumps were generated in various places.

(2) The amount of the resin liquid applied was made excessively small, and the occurrence of resin accumulation was suppressed to an extremely small amount.

(3) The coating amount of the resin liquid was set to a required amount (substantially 100% saturation amount), and the coating liquid was applied uniformly with a coater to eliminate the occurrence of resin accumulation.

(Note 2) EPC roll setting (a) Large wrapping angle of EPC roll (bending angle of base material is 70 ° or less) (b) Small wrapping angle of EPC roll (bending angle of base material to roll is about 120 °) ( c) Two EPCs with a small holding angle are installed per layer

Claims (1)

[Claims] 1. A plurality of base materials containing at least two glass cloths are continuously conveyed in parallel, and the base materials are individually impregnated with a curable resin solution, and the impregnated base materials are laminated. In a wet continuous manufacturing method of a glass cloth reinforced electrical laminate, which is obtained by stacking, laminating a cover sheet and / or a metal foil, continuously curing, and then cutting, using a glass cloth raw sheet with little bending and conveying. When adjusting the tension and meandering correction of the glass cloth base material, and by preventing the impregnating resin from being unevenly distributed locally, the glass cloth base material is conveyed while suppressing the bending of the glass cloth base material to 20 mm / m or less. A method for continuously producing a glass cloth-reinforced electrical laminate, comprising: