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

An evaluation method and technology of glass fiber cloth, which can be used in measuring devices, instruments, scientific instruments, etc., which can solve the problem that the shape and area of ​​glass fiber cloth weaving nodes cannot be solved, and the dimensional stability or expansion and shrinkage changes of glass fiber cloth-based laminates cannot be applied. It can avoid the high sampling cost, the detection method is simple and easy to implement, and the test cost can be reduced.

Active Publication Date: 2016-01-20
SHENGYI TECH SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] See attached Figure 1~2 As shown, a method for evaluating the size expansion and contraction of glass fiber cloth-based laminates,

[0046] The manufacturing process of the glass fiber cloth-based copper-clad laminate comprises the following steps: taking Taiwan Huber, model 7628 (basis weight 210g / m 2 ) glass fiber cloth is unrolled and then moved into the glue tank, impregnated with a resin mixture mainly composed of epoxy resin and other thermosetting resins, the resin content is precisely controlled by metering rollers, heated and dried in an oven, and a prepreg is obtained; After the 7628 prepregs are combined according to the process specifications, they are covered with 1OZ copper foil up and down, and the mirror steel plates are used to separate the laminates, and sent to the vacuum lamination machine, and the sheet laminates are made under a certain temperature, pressure and vacuum degree. The thickness of the substrate is 0.20mm, and both sides are covered w...

Embodiment 2

[0056] This example is basically similar to Example 1, the difference is that Shanghai Honghe, model 106 glass fiber cloth is unrolled to make 106 prepreg, and a single sheet 106 is used to press the substrate with a thickness of 0.05mm, and both sides are covered with 1 / 3OZ (abbreviated TOZ, the same below) copper foil.

[0057] The performance of the dimensional stability of the 0.05T / T substrate was evaluated by the same method as in Example 1. The relevant test data and evaluation standards are shown in Table 2 below.

[0058] Table 20. Summary of Dimensional Stability Evaluation Data for 05T / T Thin Fiberglass Cloth-Based Laminates

[0059]

[0060] It can be seen from Table 2 that the difference between the standard deviation of the node area of ​​the 106 fiberglass cloth at the left, middle and right positions of the 0.05T / T base material and the standard deviation of the original area of ​​the 106 fiberglass cloth of this specification is 3.09% and 2.15% respectively...

Embodiment 3

[0062] On the basis of Example 1, the test sample was baked at the glass transition temperature Tg+5°C of the material, that is, the baking temperature was 155°C, and the baking time was 2 hours. details as follows:

[0063] Take the sample of the thin glass fiber cloth-based laminate to be tested, chemically etch away the copper foil coated on both sides, then wash, dry, and perform baking treatment, punching at different positions along the warp or weft edge of the substrate Take the test sample block;

[0064] Under the CCD lens, read the yarn width and yarn distance data of the glass fiber cloth in the warp and weft directions of 10 groups of substrates, and then calculate the area of ​​the glass fiber cloth weaving nodes; the randomly read continuous ten tissue node area data Minitab analysis software, Find the standard deviation of the area of ​​the fiberglass cloth weaving nodes in this piece of test sample;

[0065] Further, compare the standard deviation of the area...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/16G01N33/00
Inventor 李雪吴炜来王耀罗鹏辉任科秘
Owner SHENGYI TECH SUZHOU
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