Electronic-grade glass cloth and method for testing holes of monofilaments of yarns

Abstract

The invention relates to an electronic-grade glass cloth applied to the technical field of the electronic-grade glass fiber, an electronic-grade glass fiber yarn and a low-dielectric constant glass fiber yarn which are used for preparing the electronic-grade glass cloth, and a method for testing micro holes of glass yarns of circuit board sheets made from the electronic-grade glass fiber cloth. The test method comprises the following steps of: soaking the glass fiber cloth in the alcohol solution, wherein the refractive index of which is close to that of the glass fiber; completely replacing the gas on the surface of the glass fiber yarn by the alcohol solution and forming a transparent uniform solution; finally, observing the holes from a microscope. The test method is applicable to the field of the other insulation products reinforced by the electronic-grade glass fiber cloth, the electronic-grade glass fiber yarn and the low-dielectric constant glass fiber yarn.

Description

technical field [0001] The present invention relates to an electronic grade glass fiber cloth used in the technical field of electronic grade glass fiber, electronic grade glass fiber yarn (E fiber glass), low dielectric constant glass fiber yarn (D fiber glass) and the use of the electronic grade glass fiber yarn (E fiber glass). Test method for monofilament voids in printed circuit boards made of electronic grade glass fiber cloth as a reinforcing material. This test method is also applicable to the field of other insulating products reinforced with electronic grade glass fiber cloth and electronic grade glass fiber yarn . Background technique [0002] Electronic-grade glass fiber cloth is woven from electronic-grade glass fiber yarn of specific specifications by air-jet loom. It has high strength, high heat resistance, good chemical resistance, good flame resistance, good electrical properties and good dimensional stability. It is the main raw material for the manufactur...

AI Technical Summary

Problems solved by technology

[0004] If you want to detect the glass fiber voids of the substrate, the accurate method is through the scanning electron microscope SEM method, but because the voids have a low probability of occurrence and their volume is very small, take the most easily detectable electronic grade glass fiber yarn EC9-68×1 as an example , a 10cm×10cm electronic grade glass fiber cloth (codenamed 7628 cloth in IPC-4412A), in which the number of glass fiber monofilaments is more than 120,000. With the current general level of tank kiln technology, the number of glass fiber cavities is average. It is less than 100 per million (below 100ppm), and its detection difficulty is no different from finding a needle in a haystack, which is time-consuming and laborious, and the efficiency is not high

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