Evaluation method for dimension expansion and contraction of glass fiber fabric base layer pressing plate

Abstract

The invention discloses an evaluation method for dimension expansion and contraction of a glass fiber fabric base layer pressing plate. The evaluation method comprises the following steps: (1) removing a copper foil from the glass fiber fabric base layer pressing plate to be detected, which serves as a sample, cleaning and drying to obtain a test sample block along different positions on the edges in the warp-wise or broad-wise directions of a base material; (2) respectively detecting yarn width and yarn distance data of glass fiber fabrics in the test sample block, calculating an area of warp and weft yarn weaving nodes of the glass fiber fabrics, and calculating a standard difference Delta 1 of the area of the yarn weaving nodes of the glass fiber fabrics in the sample block; (3) as glass fiber cloth which is the same as that in the step (1) is taken as a standard sample sheet, calculating a standard difference Delta 2 of the yarn weaving nodes of the glass fiber fabrics in the standard sample; and (4) comparing Delta 1 with Delta 2, and evaluating and judging the dimension expansion and contraction situation of the glass fiber fabric base layer pressing plate according to a fit standard. The evaluation method disclosed by the invention can meet the requirements on a quick and precise test in a production manufacturing process and dimension stability of a representation base material.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to a method for evaluating the size expansion and contraction of a glass fiber cloth-based laminate. Background technique [0002] With the development of electronic products in the direction of miniaturization or large-scale, lightweight, thin and intelligent, the PCB board (Printed Circuit Board, printed circuit board) is developing in the direction of high density, multi-layer and thin. HDI (HighDensityInterconnect, high-density interconnection) PCB manufacturing technology is therefore flourishing. In the processing of HDIPCB boards, multiple pressing processes are usually used. Therefore, the consistency of the size of the glass fiber cloth-based laminate used in it has a great influence on the accuracy of the drilling hole position of the PCB board, the accuracy of the outer layer graphics and the subsequent assembly accuracy. Great influence. [0003] In recent y...

AI Technical Summary

Problems solved by technology

This technical solution is mainly aimed at the current domestic evaluation and measurement of clothing dimensional stability, including elastic deformation, plastic deformation, wrinkle deformation, shrinkage deformation, etc. GB / T8628 standard is generally used to measure the dimensional change of fabrics before and after shrinkage treatment, and there is little information and measurement The process is cumbersome, only the simple change rate of the length and width (warp and weft) direction of the fabric

However, this technical solution has the following problems: 1) The fabric test sample needs to be marked before the test, and the difference in size after washing and drying treatment and before treatment is used to characterize the shrinkage uniformity, shrinkage range, shrinkage rate and Shrinkage shape characteristics; the process flow of glass fiber cloth-based copper-clad laminates is long, and it is impossible to realize the one-to-one correspondence between marking on the glass fiber cloth weaving nodes and comparing the changes in the marking points in the base material; 2) This scheme only meets the detection requirements The shrinkage variation, rate of change, shrinkage uniformity, and morphological characteristics of the fabric in a single one-dimensional direction in the warp or weft (long side or short side) cannot be detected in both warp and weft directions. 3) This technical solution emphasizes the acquisition of color images of fabrics through the foreground and background separation technology, which cannot solve the problem of penetrating through the surface of the substrate. The purpose of directly observing the shape and area of ​​the glass fiber cloth weaving node

It can be seen that the above technical solutions cannot be applied to comprehensively and accurately characterize the dimensional stability or expansion and shrinkage of glass fiber cloth-based laminates everywhere, so they cannot be used in the field of glass fiber cloth-based copper-clad laminates

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