JPH047110A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet excellent in workability with small diameter drill and surface smoothness by a method wherein the base material of the surface layer of the laminated sheet concerned is made of only warps or made by bonding warps and woofs to each other without being woven, when the laminated sheet concerned is manufactured by laminating one or a plurality of prepregs to each other. CONSTITUTION:As the base material made of only warps or made by bonding warps and woofs to each other without being woven (or non-woven base material), one made by thermally welding warps and woofs together, one made by bonding warps and woofs to each other through resin sheet, one made by directly bonding warps and woofs together by binder, one made by arranging only warps on one side (or on both sides) of glass fabric consisting of glass cloth, glass paper or the like, one made by bonding only warps to each other with binder and the like can be examplified. Under the condition that the non-woven base material is used for the base material of surface layer and ordinary glass cloth or non-woven glass fabric base material is used for center layer, resin varnish is infiltrated by conventional procedure in the above- mentioned base materials in order to obtain prepregs. By laminate-molding the prepregs, the laminated sheet concerned is obtained. When one or two prepregs are used, only the above-mentioned non-woven base material is used.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a circuit board for fine patterns, which has fewer irregularities that cause positional deviation and has good resist printing accuracy in the drilling process of laminated boards using a small-diameter drill. This relates to a manufacturing method.

[Conventional technology]

Conventionally, methods for producing laminates with excellent surface smoothness include: ■ using thin cloth for the surface layer, ■ using prepreg with a high resin content, and ■ glass paper (nonwoven fabric).
, using paper, ■ impregnating it with filler-containing varnish, ■
There are methods such as laminating thermoplastic resin or thermosetting resin sheets, but each method has different characteristics such as heat resistance, mechanical strength, thickness accuracy,
It had some shortcomings in terms of productivity, etc.

Among these, laminates using thin cloth on the surface have relatively good properties, but they are not yet satisfactory, and further improvements have been desired.

[Problem to be solved by the invention]

In view of the above, the present invention aims to provide a printed circuit laminate that has excellent workability with a small diameter drill and surface smoothness necessary for obtaining fine patterns without reducing heat resistance or mechanical strength. be.

[Means to solve the problem]

The present invention relates to a method for producing a laminate in which one or more prepregs obtained by impregnating a fiber base material with a resin face are stacked, sandwiched between metal mirror plates, and heated and pressed. This is a method for manufacturing a laminate, characterized by using only warp threads or warp and weft threads bonded together without weaving as the base material, thereby producing a laminate with excellent small-diameter drill workability and surface smoothness. The present invention relates to a method for manufacturing.

The base materials used in the present invention in which only warp threads or warp threads and weft threads are bonded together without being woven (hereinafter referred to as non-woven base materials) include: - warp threads and weft threads welded together by heat; Items glued together with a resin sheet; ■ Items in which the warp and weft threads are bonded directly using a binder; ■ Items in which only the warp threads are placed on one (or both sides) of glass cloth such as glass cloth or glass paper; ■ Items in which only the warp threads are glued together with a binder. I can list things that I did.

These nonwoven base materials are used as surface layer base materials, and the center layer is usually glass cloth or glass nonwoven base material, impregnated with resin varnish by a conventional method to obtain prepreg, and these are laminated and molded. Obtain a laminate. 1 or 2 sheets of prepreg
When using a sheet, only the above-mentioned nonwoven base material is used.

[For production]

Laminated boards used as printed circuit boards are usually required to have mechanical strength and heat resistance, so glass cloth is often used as the surface layer base material. Recently, thin glass cloth with a thickness of about 100 μm has been used as a surface layer base material for small diameter drilling and fine patterning. This considerably solves the above problem.

However, since the yarns that make up glass cloth basically have vertical undulations due to weaving, such laminates do not necessarily have sufficient plane smoothness, and when processing small diameter drills, the tip of the drill When the yarn is pressed together, it slides into the weave, causing large bends.

On the other hand, in the laminate of the present invention, since the surface layer is a non-woven base material, the outermost surface is aligned with warp (or weft) threads, so the surface smoothness is excellent and the tip of the drill does not slip during small diameter drilling. It's also small.

〔Example〕

The following base materials were used and impregnated with epoxy resin varnish to create four types of prepregs.

(A) Base material consisting of a glass cloth with a thickness of 100μ and only a warp made of yarn with a filament diameter of 6μ on one side (B) Glass cloth with a thickness of 100μ (C) Glass cloth with a thickness of 180μ (D) Glass cloth with a thickness of 400μ Glass nonwoven fabric These four types of prepregs were combined as shown in Table 1, and an epoxy resin laminated i-layer having a thickness of 1.61 mm was formed by disposing 18 μm copper foil on both sides.

*The two layers were stacked so that the warp was the surface layer and were perpendicular to each other.

(Measurement method) Bending strength: Moisture absorption soldering heat resistance according to JIS K 6911 - After etching the entire surface on one side, after 2 hours in a pressure car (125°C, Z 3 atmospheres), the soldering heat resistance at 280°C was measured according to JIS C6481. Measured.

Small diameter drill large bend: Use a drill with a diameter of 0.4 m, 3 laminated plates, drill rotation speed 70.00 Orpm, feed rate 1
．． Measured at 5m/min.

Surface smoothness: Measured using a surface roughness meter at the center of the laminate.

Claims (1)

[Claims] (1) In a method for manufacturing a laminate in which one or more prepregs obtained by impregnating a fiber base material with resin varnish are stacked, sandwiched between metal mirror plates, and heated and pressed, the base layer of the surface layer of the laminate is A method for manufacturing a laminate, characterized in that the material used is warp alone or warp and weft glued together without weaving.