A method for quickly measuring the cross-sectional dimensions of flat glass fibers

Abstract

The present invention belongs to the technical field of glass fiber measurement, and specifically relates to a method for rapid measurement of the cross-sectional dimensions of flat glass fibers. Flat glass fiber strands are bundled and wound to form empty loops, short fiber bundles are cut in a direction perpendicular to the flat glass fiber strands, the short fiber bundles are erected on a glass slide, and the cross-sectional dimensions of individual fibers in the short fiber bundles are measured using an optical microscope. The present invention is suitable for rapid detection of cross-sectional dimensions of flat glass fibers, and has low labor intensity; while ensuring that the detection results are reliable, the detection efficiency is greatly improved. The present invention can obtain detection results in a very short time, can quickly guide production, and is particularly effective when problems are encountered in production. Production can be quickly adjusted, reducing the amount of defective products produced. It is particularly suitable for production lines with large output and high production efficiency, and is very beneficial to production quality control.

Description

Technical Field

[0001] The invention belongs to the technical field of glass fiber measurement, and in particular relates to a method for quickly measuring the cross-sectional dimensions of a flat glass fiber. Background Art

[0002] At present, there are mature international and national standards for the fiber diameter detection method of glass fiber, which is divided into longitudinal method and cross-sectional method. However, the longitudinal method is only applicable to the measurement of regular circular conventional fibers, but not to special-shaped cross-sections, especially flat fibers; the cross-sectional method can be used to detect the cross-section of flat fibers, but because the sample preparation process of this method needs to be carried out in a laboratory with high requirements for ambient temperature and humidity, it is necessary to soak the fiber in resin, cure, cut, grind and polish, etc. The sample preparation process alone is time-consuming, cumbersome, and the workload of testers is large. The detection cost is high and the detection efficiency is low. The lag in the test results will seriously affect the speed of production adjustment, especially when production encounters problems and cannot be adjusted in time, resulting in a large number of defective products, which is not conducive to product quality control. Therefore, it is not suitable for the current enterprise assembly line production model.

[0003] Chinese patent CN102506756A discloses a method for characterizing the cross-sectional morphology and size of glass fiber or basalt fiber, comprising the following steps: sample preparation, cross-sectional morphology characterization, and cross-sectional size characterization, wherein the cross-sectional morphology characterization and cross-sectional size characterization are performed using a metallographic microscope, and the sample preparation includes sampling, sample dispersion, curing, grinding, cleaning, and polishing. This patent does a lot of preliminary work when measuring the cross-sectional size of glass fiber or basalt fiber, which is time-consuming and cumbersome to operate.

[0004] Therefore, there is an urgent need to provide a method for quickly measuring the cross-sectional dimensions of flat glass fibers that is fast, simple to operate, and ensures reliable test results while greatly improving test efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a method for quickly measuring the cross-sectional dimensions of flat glass fibers, which has the advantages of fast measurement, simple operation, and can greatly improve the detection efficiency while ensuring the reliability of the detection results, and can be used in production lines with high production efficiency.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] The method for quickly measuring the cross-sectional dimensions of flat glass fibers disclosed in the present invention comprises bundling flat glass fiber strands and winding them into empty loops, cutting short fiber bundles in a direction perpendicular to the flat glass fiber strands, placing the short fiber bundles upright on a glass slide, and measuring the cross-sectional dimensions of individual fibers in the short fiber bundles using an optical microscope.

[0008] in:

[0009] Preferably, the short fiber bundle is placed upright on a glass slide, clean water is dripped onto the cross section of the short fiber bundle, and then the cross-sectional dimensions of a single fiber in the short fiber bundle are measured using an optical microscope.

[0010] The length of the short fiber bundle is 2-3 mm.

[0011] The magnification of the optical microscope is 400-500 times.

[0012] Preferably, transparent tape is used to bundle the flat glass fiber strands in a direction perpendicular to the flat glass fiber strands and wind them to form an empty loop. Specifically, the flat glass fiber strands are vertically adhered to the transparent tape, and one side of the transparent tape is folded along the edge of the flat glass fiber strands to wrap the flat glass fiber strands, and the flat glass fiber strands are continued to be wound along the folded direction to form an empty loop.

[0013] The cross-sectional dimensions of the single fiber are the thickness dimension and the length dimension on the cross-sectional dimension of the single fiber.

[0014] Preferably, the cross-sectional dimensions of 50-70 fibers are measured using an optical microscope, and the average value of the measurement results is taken to obtain the cross-sectional dimensions of the flat glass fiber.

[0015] The length of the flat glass fiber strand is 5-10 cm.

[0016] The method for quickly measuring the cross-sectional dimensions of a flat glass fiber according to the present invention comprises the following steps:

[0017] (1) Cut a 5-10 cm flat glass fiber raw fiber bundle and dry it naturally; in order to maintain the bundle of fibers, it is not necessary to burn off the impregnation agent at high temperature, nor is it necessary to twist the bundle manually;

[0018] (2) The flat glass fiber strand bundle is vertically adhered to the transparent tape, and one side of the transparent tape is folded along the edge of the flat glass fiber strand bundle to wrap the flat glass fiber strand bundle, and the flat glass fiber strand bundle is continuously wound along the folded direction to form an empty circle;

[0019] (3) using a cutter to cut short fiber bundles with a length of 2-3 mm in a direction perpendicular to the flat glass fiber strand bundle;

[0020] (4) Place the short fiber bundle upright on a glass slide and use a dropper to drip clean water on the cross section of the short fiber bundle to ensure the clarity of the fiber cross section image under the microscope;

[0021] (5) Place the short fiber bundle after adding clean water under an optical microscope, adjust the focus, and start measuring the fiber cross-sectional dimensions, that is, the thickness and length dimensions on the cross section of a single fiber;

[0022] (6) Move the glass slide and measure the cross-sectional dimensions of 50 to 70 fibers. Take the average value of the measurement results to obtain the cross-sectional dimensions of the flat glass fiber.

[0023] The beneficial effects of the present invention are as follows:

[0024] The detection method of the prior art is time-consuming, requiring at least 2.5 hours. For resins with long curing time (such as epoxies), the time may exceed 16 hours, which is inefficient. At the same time, the operation is complicated, the test environment requirements are high, the detection cost is high, and the workload of the tester is large. The present invention intercepts a 5-10cm flat glass fiber strand bundle and dries it naturally. In order to maintain the bundle of the whole bundle of fibers, it is not necessary to burn it at high temperature to remove the impregnation agent, and it is not necessary to twist the strands manually. The detection method of the present invention can be completed using only conventional products such as ordinary microscopes and cutters, and there are no special requirements for the detection environment, and the requirements of the microscope storage environment can be met. The present invention has low detection cost, simple operation, easy to master, low workload for testers, low requirements for the detection environment, and can be carried out at the production site. The whole detection process can be completed in 20min, and the fiber cross-section imaging clarity is also good, which not only ensures the timeliness of the data, but also ensures reliability.

[0025] The present invention is suitable for rapid detection of flat glass fiber cross-sectional dimensions, with low labor intensity; while ensuring the reliability of the detection results, the detection efficiency is greatly improved. The present invention can obtain the detection results in a very short time, can quickly guide production, and is particularly effective when problems are encountered in production. Production can be adjusted quickly, reducing the amount of defective products produced. It is particularly suitable for production lines with large output and high production efficiency, and is very beneficial to production quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the rapid measurement of the cross-sectional dimensions of a flat glass fiber of the present invention;

[0027] Among them: 1. Flat glass fiber strands; 2. Transparent tape; 3. The folding direction of the transparent tape; 4. The edge position of the folded transparent tape; 5. Cutting line; 6. Drops of clean water; 7. Glass slide;

[0028] Figure 2 are cross-sectional images of T4355ST precursor fibers at different angles under an optical microscope in Example 1;

[0029] Figure 3 are cross-sectional images of T436 precursor fibers at different angles under an optical microscope in Example 2;

[0030] Figure 4 These are cross-sectional images of T4355 precursor fibers at different angles under an optical microscope in Example 3. DETAILED DESCRIPTION

[0031] The present invention is further described below with reference to the embodiments.

[0032] Example 1

[0033] Tested sample: T4355ST raw yarn produced by Taishan Glass Fiber Co., Ltd.

[0034] The method for quickly measuring the cross-sectional dimensions of a flat glass fiber comprises the following steps:

[0035] (1) Take a bundle of T4355ST raw silk with good bundling, cut a section of 8 cm long T4355ST raw silk bundle, and dry it naturally; in order to maintain the bundling of the whole bundle of fibers, it is not necessary to burn off the impregnation agent at high temperature, nor is it necessary to twist the bundle manually;

[0036] (2) Stick the T4355ST raw yarn bundle vertically on the transparent tape, fold the transparent tape along the edge of the T4355ST raw yarn bundle, wrap the T4355ST raw yarn bundle, and continue to wrap it along the folded direction to make an empty circle, such as Figure 1 As shown in process 1-3;

[0037] (3) Use a sharp knife to cut short fiber bundles with a length of 3 mm in the direction perpendicular to the T4355ST raw fiber bundle, such as Figure 1 As shown in process 4;

[0038] (4) Place the short fiber bundle upright on a glass slide and use a dropper to add a small amount of water to the cross section of the short fiber bundle to ensure the clarity of the fiber cross section image under the microscope. Figure 1 As shown in process 5;

[0039] (5) Place the sample obtained in step (4) under an optical microscope with a magnification of 400 times, adjust the focus of the optical microscope knob, measure the fiber cross section with a clear image on the screen, measure the dimensions of the thickness and length directions of the cross section of a single fiber in the short fiber bundle, and record the data; the cross-sectional images of the fibers at different angles under the optical microscope are as follows: Figure 2 As shown;

[0040] (6) Move the glass slide and randomly select fibers until 70 fiber cross sections are measured. Calculate the average values ​​of 70 thickness dimensions and 70 length dimensions respectively. The average values ​​and coefficients of variation of the dimension data in each direction are shown in Table 1.

[0041] Table 1 T4355ST cross-sectional dimension test data

[0042]

[0043]

[0044] Example 2

[0045] Tested sample: T436 raw yarn produced by Taishan Glass Fiber Co., Ltd.

[0046] The method for quickly measuring the cross-sectional dimensions of a flat glass fiber comprises the following steps:

[0047] (1) Take a bundle of T436 raw silk with good bundling, cut a 6 cm long section of T436 raw silk bundle, and dry it naturally; in order to maintain the bundling of the whole bundle of fibers, it is not necessary to burn off the impregnation agent at high temperature, nor is it necessary to twist the bundle manually;

[0048] (2) The T436 raw yarn bundle is vertically adhered to the transparent tape, and the transparent tape is folded along the edge of the T436 raw yarn bundle to wrap the T436 raw yarn bundle, and the tape is continued to be wound along the folded direction to form an empty circle;

[0049] (3) Using a sharp knife, cut short fiber bundles with a length of 3 mm in a direction perpendicular to the T436 raw fiber bundle;

[0050] (4) Place the short fiber bundle upright on a glass slide and use a dropper to drop a small amount of water on the cross section of the short fiber bundle to ensure the clarity of the fiber cross section image under the microscope;

[0051] (5) Place the sample obtained in step (4) under an optical microscope with a magnification of 400 times, adjust the focus of the optical microscope knob, measure the fiber cross section with a clear image on the screen, measure the dimensions of the thickness and length directions of the cross section of a single fiber in the short fiber bundle, and record the data; the cross-sectional images of the fibers at different angles under the optical microscope are as follows: Figure 3 As shown;

[0052] (6) Move the glass slide and randomly select fibers until 70 fiber cross sections are measured. Calculate the average values ​​of 70 thickness dimensions and 70 length dimensions respectively. The average values ​​and coefficients of variation of the dimension data in each direction are shown in Table 2.

[0053] Table 2 T436 raw yarn cross-sectional dimensions test data

[0054]

[0055] Example 3

[0056] Tested sample: T4355 raw yarn produced by Taishan Glass Fiber Co., Ltd.

[0057] The method for quickly measuring the cross-sectional dimensions of a flat glass fiber comprises the following steps:

[0058] (1) Take a bundle of T4355 raw silk with good bundling, cut a section of 8 cm long T4355 raw silk bundle, and dry it naturally; in order to maintain the bundling of the whole bundle of fibers, it is not necessary to burn off the impregnation agent at high temperature, nor is it necessary to twist the bundle manually;

[0059] (2) The T4355 raw yarn bundle is vertically adhered to the transparent tape, and the transparent tape is folded along the edge of the T4355 raw yarn bundle to wrap the T4355 raw yarn bundle, and the tape is continued to be wound along the folded direction to form an empty circle;

[0060] (3) Using a sharp knife, cut short fiber bundles with a length of 3 mm in a direction perpendicular to the T4355 raw fiber bundle;

[0061] (4) Place the short fiber bundle upright on a glass slide and use a dropper to drop a small amount of water on the cross section of the short fiber bundle to ensure the clarity of the fiber cross section image under the microscope;

[0062] (5) Place the sample obtained in step (4) under an optical microscope with a magnification of 400 times, adjust the focus of the optical microscope knob, measure the fiber cross section with a clear image on the screen, measure the dimensions of the thickness and length directions of the cross section of a single fiber in the short fiber bundle, and record the data; the cross-sectional images of the fibers at different angles under the optical microscope are as follows: Figure 4 As shown;

[0063] (6) Move the glass slide and randomly select fibers until 70 fiber cross sections are measured. Calculate the average values ​​of 70 thickness dimensions and 70 length dimensions respectively. The average values ​​and coefficients of variation of the dimension data in each direction are shown in Table 3.

[0064] Table 3 T4355 raw yarn cross-sectional dimensions test data

[0065]

Claims

1. A method for quickly measuring the cross-sectional dimensions of a flat glass fiber, characterized in that: The flat glass fiber strand bundle is vertically glued on the scotch tape, and the scotch tape is folded along the edge of the flat glass fiber strand bundle to wrap the flat glass fiber strand bundle, and the scotch tape is continued to be wound along the folded direction to make an empty circle, and short fiber bundles are cut in a direction perpendicular to the flat glass fiber strand bundle, and the short fiber bundle is erected on a glass slide, and the cross-sectional dimensions of a single fiber in the short fiber bundle are measured using an optical microscope.

2. The method for rapid measurement of flat glass fiber cross-sectional dimensions according to claim 1, characterized in that: The short fiber bundle is placed upright on a glass slide, clean water is added to the cross section of the short fiber bundle, and the cross-sectional dimensions of a single fiber in the short fiber bundle are measured using an optical microscope.

3. The method for rapid measurement of flat glass fiber cross-sectional dimensions according to claim 2, characterized in that: The length of the short fiber bundles was 2-3 mm.

4. The method for rapid measurement of flat glass fiber cross-sectional dimensions according to claim 1, characterized in that: The magnification of the optical microscope is 400-500 times.

5. The method for rapid measurement of cross-sectional dimensions of flat glass fibers according to claim 1, characterized in that: The cross-sectional dimensions of a single fiber are the thickness and length dimensions on the cross-section of the single fiber.

6. The method for rapid measurement of flat glass fiber cross-sectional dimensions according to claim 1, characterized in that: The cross-sectional dimensions of 50 to 70 fibers were measured using an optical microscope, and the average of the measured results was taken to obtain the cross-sectional dimensions of the flat glass fiber.

7. The method for rapid measurement of flat glass fiber cross-sectional dimensions according to claim 1, characterized in that: The length of the flat glass fiber strands is 5-10 cm.

8. The method for rapidly measuring the cross-sectional dimensions of a flat glass fiber according to any one of claims 1 to 7, characterized in that The following steps are involved: (1) Cut 5-10 cm long flat glass fiber strands and let them dry naturally; (2) The flat glass fiber strands are vertically glued to the scotch tape, and the scotch tape is folded along the edge of the flat glass fiber strands to wrap the flat glass fiber strands, and the scotch tape is continued to be wound along the folded direction to form an empty circle; (3) Using a cutter to cut short fiber bundles with a length of 2-3 mm in a direction perpendicular to the flat glass fiber strand bundle; (4) Place the short fiber bundle upright on a glass slide and use a dropper to drip clean water onto the cross section of the short fiber bundle; (5) Place the short fiber bundle after adding clean water under an optical microscope, adjust the focus, and start measuring the fiber cross-sectional dimensions; (6) Move the glass slide and measure the cross-sectional dimensions of 50 to 70 fibers. Take the average value of the measurement results to obtain the cross-sectional dimensions of the flat glass fiber.

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