JPH0744321B2 - Method for manufacturing metal-clad laminate for electric use - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a metal-clad laminate for electrical use. More specifically, the present invention relates to a continuous method for producing a metal-clad laminate for electrical use, such as for a printed wiring board, which enables uniform resin impregnation into a glass nonwoven fabric substrate and prevents molding defects. .

(Prior Art) Conventionally, for a metal-clad laminate for electrical use in which metal foils such as copper foils are laminated, a glass nonwoven fabric is impregnated with a resin such as an epoxy resin, an unsaturated polyester resin or a phenol resin, and then this resin is used. It is known to manufacture by a continuous method in which a metal foil is continuously laminated on an impregnated glass substrate.

In this method, for example, as shown in FIG.
Glass non-woven fabric (a) is impregnated with resin (c) using coating tool (a), and if necessary, secondary resin impregnation is performed through a shower pipe (d) etc., and squeeze roll (e) is used to squeeze. A resin-impregnated base material for a laminated plate is produced by processing, a metal foil is laminated on the base material, and a curing treatment is performed.

In the squeeze roll (e), a plurality of resin-impregnated glass non-woven fabrics and further glass fabrics are laminated.

In such a continuous method, if the above-mentioned secondary resin impregnation is not carried out, defects such as voids often occur due to non-uniformity or lack of resin impregnation. It is said that the impregnation is desired.

(Problems to be Solved by the Invention) However, in this conventional production method, although highly efficient continuous production is possible, when impregnating a glass nonwoven fabric with a resin, the support roll (f) in the continuous process is a cylinder. -Shaped roll, because the resin is scraped off by this support roll (f), molding failure of the base material made of resin-impregnated glass non-woven fabric occurs, and it is absolutely necessary to supply excess resin for impregnation. there were.

On the other hand, however, this excessive resin supply has a drawback that the glass nonwoven fabric base material is cut due to an increase in the weight of the resin and the glass nonwoven fabric when the amount thereof increases.

Therefore, it has been desired to realize an improved method for preventing the molding failure of the laminated plate due to the non-uniformity of the resin impregnation, and at the same time, not causing the cutting of the glass nonwoven fabric substrate due to the excessive resin supply.

The present invention has been made in view of such circumstances, and improves the drawbacks of the conventional method, prevents defective molding, and enables highly efficient continuous production without cutting the glass nonwoven fabric substrate. It is an object of the present invention to provide an improved method for producing a metal-clad laminate for electric use that is capable of being improved.

(Means for Solving the Problems) As a solution to the above problems, the present invention provides a method for impregnating a glass nonwoven fabric with a resin in a metal-clad laminate for electrical use, in which the glass non-woven fabric is coaxially aligned with the circumferential surface of a cylindrical body. A groove cutting roll having a circumferential groove formed in the groove is used as a support roll arranged below the moving glass nonwoven fabric,
Provided is a method for producing a metal-clad laminate for electrical use, which comprises continuously impregnating a lower surface of a glass nonwoven fabric with the support rolls.

The method of the present invention will be described with reference to the drawings. For example, in the resin impregnation step in the production of the metal-clad laminate for electrical use, which has already been illustrated in FIG. It is characterized by continuous resin impregnation. As the groove cutting support roll in this case, for example, as shown in FIG. 1, the groove portion (1) is arranged coaxially with the circumferential surface of the cylindrical body.
Has a circumferential groove formed with a groove, the depth (h) and width (W) of the groove (1), and the number of grooves (1) installed in the length direction of the support roll (2). Regarding the type, shape, and shape of the target glass non-woven fabric or resin, etc.
It can be made appropriate according to its characteristics and the like.

It should be noted that the secondary resin impregnation as in the conventional method is not essential and may be adopted as necessary.

(Operation) In the method for producing a metal-clad laminate for electric use of the present invention,
As described above, since the groove cutting roll having the circumferential groove portion (1) is used as the support roll (2) of the glass nonwoven fabric (3), the resin impregnated in the resin impregnation step is scraped off like a conventional cylindrical roll. Without this, the groove (1) realizes a state in which the resin is retained in the glass nonwoven fabric.

For this reason, molding defects may occur in the steps after the squeeze roll treatment due to insufficient resin impregnation amount or non-uniformity, and the conventional method of cutting the glass non-woven fabric substrate due to an increase in its own weight due to the use of a large excess amount of resin. There are no legal drawbacks.

It is possible to manufacture laminated boards with high quality and high productivity.

(Example) A glass nonwoven fabric was impregnated with an epoxy resin in an amount of 50% by weight based on the total weight. The impregnation was performed as a roll treatment.

In this process, a grooved roll having a circumferential groove as illustrated in FIG. 1 was used as a support roll. The obtained resin-impregnated base material was laminated with a copper foil to produce a double-sided copper-clad laminate.

The moldability of the laminated plate and the cutting of the base material at this time were evaluated. As shown in Table 1, the resin impregnation was uniform, no molding failure occurred, and the glass nonwoven fabric base material did not cut.

Also, when the secondary impregnation treatment with the shower pipe was performed, neither molding failure nor substrate cutting occurred as in the above.

On the other hand, for comparison, when using a conventional cylindrical roll, as shown in Table 1, when the secondary impregnation is performed, the glass nonwoven fabric substrate is cut, and when the secondary impregnation is not performed. However, although the substrate was not cut, defective molding due to generation of voids was unavoidable.

Of course, the present invention is not limited to the above examples, and various effects such as resins, glass non-woven fabrics, and electrical laminates for laminating various metal foils can be achieved. Is.

(Effects of the Invention) According to the present invention, as described in detail above, the glass nonwoven fabric is uniformly impregnated with the resin to have good moldability, and the glass nonwoven fabric base material is not cut during the resin impregnation. It becomes possible to manufacture a metal-clad laminate for use.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a groove cutting roll used in the present invention. FIG. 2 is a process sectional view showing a conventional manufacturing method. 1 ... Groove 2 ... Support roll 3 ... Glass non-woven fabric

Claims (1)

[Claims] 1. A step of impregnating a glass nonwoven fabric with a metal-clad laminate for electrical use in which a grooved roll having a circumferential groove formed coaxially with the circumferential surface of a cylindrical body is moved along the circumferential surface of the cylindrical body. A method for producing a metal-clad laminate for electrical use, which is used as a support roll arranged below a glass non-woven fabric, and is continuously impregnated while supporting the lower surface of the glass non-woven fabric with this support roll.