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A method for testing the opening degree of glass fiber cloth

A test method and technology of glass fiber cloth, which are applied in textile testing, measuring devices, instruments, etc., can solve the problem of not being able to simply and intuitively reflect the opening degree of glass fiber cloth, and achieve the effect of simple and intuitive test method and high repeatability.

Inactive Publication Date: 2018-07-17
GUANGDONG SHENGYI SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are almost no test methods for fiberglass cloth opening degree in the glass fiber cloth and copper clad laminate industries. Most of them focus on the wettability test of glass fiber cloth, and the existing wettability test methods of glass fiber cloth cannot fully characterize glass fiber. The wettability of the cloth; it is also impossible to simply and intuitively reflect the degree of opening of the glass fiber cloth

Method used

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  • A method for testing the opening degree of glass fiber cloth
  • A method for testing the opening degree of glass fiber cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 7628 series glass fiber cloth fiber opening test method, including the following steps:

[0023] (1) measure the number n=400 of glass filaments and the diameter d=9 μm of single glass filaments in one of the glass yarn bundles in the glass fiber cloth, record the sum of the cross-sectional areas of all glass filaments in the glass yarn bundles S1, S1 =nπd 2 / 4=25446μm 2 ;

[0024] (2) Immerse the above-mentioned glass fiber cloth in the polyimide resin glue solution with a solid content of 50%, take it out, dry it and solidify it to form a prepreg, and shear the prepreg in the meridional direction, and measure any three beams of the prepreg by scanning electron microscope. The cross-sectional area S of the glass yarn bundle after dipping and curing 1 , S 2 and S 3 , the average value of the obtained cross-sectional area S=(S 1 +S 2 +S 3 ) / 3=40802μm 2 ,like figure 1 Shown is the cross-sectional area of ​​one of the glass yarn bundles after dipping and curing; ...

Embodiment 2

[0027] A method for testing the fiber opening degree of glass fiber cloth, comprising the steps of:

[0028] (1) measure the number n=450 of glass filaments and the diameter d=5 μm of single glass filaments in one of the glass yarn bundles in the glass fiber cloth, calculate the sum S1 of the cross-sectional areas of all glass filaments in the glass yarn bundles, S1= nπd 2 / 4=8831μm 2 ;

[0029] (2) Immerse the above-mentioned glass fiber cloth in an epoxy resin glue solution with a solid content of 60%, form a prepreg after drying, cut the prepreg in the latitudinal direction, and measure at least two bundles of the glass yarn bundles by a scanning electron microscope The cross-sectional area S after dipping and curing 1 and S 2 , obtain the average value S=(S 1 +S 2 ) / 2=16267μm 2 ,like figure 2 Shown is the cross-sectional area of ​​two bundles of glass yarn after dipping and curing;

[0030] (3) Calculate the porosity p between the glass yarn bundles, p=(S-S1) / S=4...

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Abstract

The invention especially relates to a testing method for the splitting degree of a glass fabric, belonging to the technical field of printed circuit boards. The testing method comprises the following steps: (1) measuring the number n of glass silks in any glass yarn of the glass fabric and the diameter d of a single glass silk and calculating the area sum S1 of cross sections of all the glass silks in the glass yarn, wherein S1 satisfies the equation that S1=nPid2 / 4; (2) soaking the glass fabric in a resin glue solution, then carrying out drying and curing so as to form a prepreg, warp-wise or broadwise cutting the prepreg and measuring the cross section area S of any glass yarn having undergone impregnation and curing; and (3) calculating the void ratio p of the glass yarn, wherein p satisfies equation that p=(S-S1) / S and the splitting degree of the glass fabric is obtained. The testing method provided by the invention can accurately determine voids among glass yarns so as to determine the splitting degree of the glass fabric, and thus, the degree of wettability of the glass fabric is determined.

Description

technical field [0001] The invention relates to the technical field of printed circuit boards, in particular to a method for testing the opening degree of glass fiber cloth. Background technique [0002] With the development of printed circuit board (PCB) technology, high Tg, halogen-free and other resin sheets are used more and more widely, and the requirements for heat resistance and surface smoothness of PCB are getting higher and higher; A new trend of technological development, in addition to continuously improving the performance of glass fiber cloth and resin glue, also puts forward higher requirements for the wetting performance between resin glue and glass fiber cloth; in order to improve the wettability of glass fiber cloth, In turn, the fiber opening technology of glass fiber cloth was born. The so-called fiber opening is to rub the glass yarn bundles to increase the gap between the glass monofilaments, which is conducive to the penetration of the resin glue into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/36
CPCG01N33/367
Inventor 杨乐
Owner GUANGDONG SHENGYI SCI TECH