JP6984835B2 - Fiber sample evaluation method and fiber sample evaluation system - Google Patents

Description

The present invention relates to a fiber sample evaluation method for evaluating the fineness of a fiber sample, and a fiber sample evaluation system.

There are fiber products such as fiber bundles made of polymer fibers and carbon fibers, woven fabrics made of fiber bundles, and non-woven fabrics. In these textile products, the fineness and the like are evaluated for quality control. Usually, textile products are manufactured by supplying raw materials to a manufacturing apparatus and winding them into a roll. When evaluating textile products, it is desirable not to cut out a part of the textile products as an evaluation sample.

Patent Document 1 discloses a method for detecting abnormal yarn in a spinning process. According to this detection method, in the solution spinning process, a chemical substance spun from a spinneret and released from a running yarn is detected. Then, the occurrence of abnormal yarn is detected from the fluctuation in the amount of the chemical substance released from the yarn.

Further, Patent Document 2 discloses a method for detecting an absorbent polymer. According to this detection method, first, an absorbent article or an absorber containing an absorbent polymer is irradiated with X-rays. Next, an X-ray irradiation image by X-rays transmitted through the absorbent article or absorber is obtained. Subsequently, the X-ray irradiation image is binarized to obtain a binarized image from which the absorbent polymer is extracted. Then, the dispersed state of the absorbent polymer is two-dimensionally evaluated from the area ratio in the binarized image.

However, in the method of Patent Document 1, it is necessary to include the chemical substance used for detection in the product. Therefore, the textile products that can be evaluated for quality are limited. Further, in the method of Patent Document 2, image processing such as contrast adjustment, flattening processing, and binarization processing is required for the captured X-ray irradiation image. Therefore, the number of steps required for evaluation increases, which is not preferable.

Japanese Unexamined Patent Publication No. 2005-154999 Japanese Unexamined Patent Publication No. 2014-126534

An object of the present invention is to provide an evaluation method for a fiber sample and a fiber sample evaluation system capable of easily evaluating the fineness without cutting out the fiber sample.

In order to solve the above problems, according to the first aspect of the present invention, a method for evaluating a fiber sample is provided. The method was to irradiate the fiber sample with X-rays from the X-ray source and to place the fiber sample facing the X-ray source so that the fiber sample was placed between the X-ray source and the image sensor. The image sensor captures an X-ray transmission image of the fiber sample, the X-ray transmission brightness obtained from the X-ray transmission image, and the width of the fiber sample among the pixels constituting the light receiving surface of the image sensor. It is provided to evaluate the fineness of the fiber sample from the brightness area which is the product of the number of corresponding pixels.

In order to solve the above problems, according to the second aspect of the present invention, a fiber sample evaluation system is provided. The system is an X-ray source, an image sensor, and an image sensor arranged to face the X-ray source so that a fiber sample is arranged between the X-ray source and the image sensor, and the image. Brightness which is the product of the X-ray transmission brightness obtained from the X-ray transmission image of the fiber sample imaged by the sensor and the number of pixels constituting the light receiving surface of the image sensor corresponding to the width of the fiber sample. It has an evaluation unit that evaluates the fineness of the fiber sample from the area.

(A) is a diagram schematically showing a fiber bundle production line and a fiber sample evaluation system, and (b) is a diagram schematically showing a fiber sample evaluation system. The figure which shows each process of the evaluation method of a fiber sample. (A) is a diagram schematically showing an X-ray transmission image of a fiber sample, and (b) is a diagram schematically showing an X-ray transmission image of a fiber sample in which the X-ray transmission luminance is inverted. The figure which shows the X-ray transmission luminance profile schematically. The figure which shows the optical photograph of the 1st fiber bundle schematically. The figure which shows the optical photograph of the 2nd fiber bundle schematically. The figure which shows the optical photograph of the 3rd fiber bundle schematically. The figure which shows the X-ray transmission luminance profile of the 1st fiber bundle. The figure which shows the X-ray transmission luminance profile of the 2nd fiber bundle. The figure which shows the X-ray transmission luminance profile of the 3rd fiber bundle. The figure which shows the X-ray transmission luminance profile per length of a 1st fiber bundle. The figure which shows the X-ray transmission luminance profile per length of the 2nd fiber bundle. The figure which shows the X-ray transmission luminance profile per length of the 3rd fiber bundle. A table showing the average luminance area of one fiber bundle in the first to third states. A table showing the average luminance area of the two fiber bundles in the first to third states. A table showing the average luminance area of the three fiber bundles in the first to third states.

Hereinafter, an embodiment embodying a fiber sample evaluation method and a fiber sample evaluation system will be described with reference to FIGS. 1 to 16.
First, the fiber sample will be described. The fiber sample is composed of fibers. Fiber samples include fiber bundles composed of a large number of single fibers, fiber bundles in which the fiber bundles are covered with covering yarns, twisted yarns formed by twisting a large number of single fibers, woven fabrics, braids, and non-woven fabrics. be. The single fiber may be an organic fiber or an inorganic fiber, or may be a different kind of organic fiber, a different kind of inorganic fiber, or a mixed fiber in which an organic fiber and an inorganic fiber are mixed. Examples of the organic fiber include acrylic fiber, nylon fiber, polyester fiber, aramid fiber, poly-p-phenylene benzobisoxazole fiber, ultra-high molecular weight polyethylene fiber and the like, and examples of the inorganic fiber include carbon fiber, glass fiber and ceramic fiber. , Metallic fiber and the like.

Next, a fiber sample evaluation system for evaluating a fiber sample will be described. In the following description, the fiber sample is embodied in a fiber bundle composed of a large number of single fibers. The fiber sample may be the fiber sample listed above, in addition to the fiber bundle composed of a large number of single fibers.

As shown in FIG. 1A, the fiber bundle 13 as a fiber sample is manufactured by the manufacturing apparatus 10. After that, the fiber bundle 13 is conveyed in a state of being tensioned by the plurality of backup rollers 11 and then wound up by the coiler 12. In the production line, the fiber bundle 13 is conveyed from the production apparatus 10 in the transfer direction Y toward the coiler 12. Further, the fiber bundle 13 is columnar.

The fiber sample evaluation system 14 of the present embodiment evaluates the fineness of the fiber bundle 13 between the time when the fiber bundle 13 is manufactured by the manufacturing apparatus 10 and the time when the fiber bundle 13 is wound by the coiler 12. The "fineness" is the ratio of the fiber mass to the fixed length of the fiber bundle 13.

The fiber sample evaluation system 14 is arranged between a pair of backup rollers 11 arranged in the transport direction Y of the fiber bundle 13. The position of the fiber sample evaluation system 14 may be appropriately changed as long as the fineness of the fiber bundle 13 can be evaluated between the time when the fiber bundle 13 is manufactured by the manufacturing apparatus 10 and the time when the fiber bundle 13 is wound by the coiler 12.

As shown in FIG. 1 (b), the fiber sample evaluation system 14 displays the evaluation results of the X-ray source 15, the image sensor 16, the evaluation unit 20 for evaluating the fineness of the fiber bundle 13, and the evaluation unit 20. It has a display device 21. The X-ray source 15 and the image sensor 16 are arranged so as to face each other so that the fiber bundle 13 is arranged between the X-ray source 15 and the image sensor 16. Therefore, the fiber bundle 13 is conveyed in the conveying direction Y and passes between the X-ray source 15 and the image sensor 16. Therefore, the passing direction of the fiber bundle 13 coincides with the transport direction Y.

The fiber sample evaluation system 14 irradiates the transported fiber bundle 13 with the X-ray L emitted from the X-ray source 15. Further, the fiber sample evaluation system 14 records the X-ray transmission image on the image sensor 16 and records the X-ray transmission brightness included in the X-ray transmission image on the image sensor 16. The X-ray transmission luminance is a dimensionless numerical value obtained by converting the X-ray dose received by the image sensor 16 on the light receiving surface during the exposure time into a charge amount and further converting it into a numerical value. The type of X-ray L emitted from the X-ray source 15 is not particularly limited, and may be any X-ray such as soft X-ray, X-ray, and hard X-ray.

As the image sensor 16, either a flat panel type or a line type can be used. Generally, in the flat panel type image sensor 16, the reading speed of the received light data is slow. Therefore, when the flat panel type image sensor 16 is used, the light receiving data can be continuously obtained by intermittently transporting the fiber bundle 13. However, if the read-out speed of the received light data is faster than the transport speed of the fiber bundle 13, intermittent transport may not be performed.

Further, in general, in the line type image sensor 16, the reading speed of the received light data is higher than that in the flat panel type image sensor 16. Therefore, when the line-type image sensor 16 is used, light-receiving data can be obtained while continuously transporting the fiber bundle 13.

The image sensor 16 records the X-ray transmission luminance of the fiber bundle 13 as RAW data or an image format file. Image format files include Bitmap (.bmp), Tagged Image File Format (.tiff), and Join Photographic Experts Group (.jpg).

Further, the image sensor 16 records the X-ray transmission luminance in a gray scale of 8 bits (256 gradations) or more and 32 bits (4294967296 gradations) or less. A 1-bit 2-gradation gray scale or a 2-bit 4-gradation gray scale is not preferable because it is difficult to evaluate the fineness of the fiber bundle 13 described later. Further, even if it is less than 8 bits, it is difficult to evaluate the fineness of the fiber bundle 13, which is not preferable. On the other hand, when the grayscale gradation is expressed by the number of bits larger than 32 bits, the fineness of the fiber bundle 13 can be evaluated, but the amount of data recorded by the image sensor 16 becomes too large, which is not preferable.

However, if the X-ray transmission luminance includes data such as blackout or whiteout, the evaluation accuracy of the fineness of the fiber bundle 13 is lowered. For this reason, the fiber sample evaluation system 14 has a mechanism that automatically detects blackouts and blown-out highlights included in the X-ray transmission luminance, and a mechanism that can adjust the X-ray intensity, detector sensitivity, transport speed, etc. based on the mechanism. It is preferable to incorporate it into the evaluation unit 20 of the above.

The evaluation unit 20 is signal-connected to the image sensor 16. The evaluation unit 20 evaluates the fineness of the fiber bundle 13 using the information regarding the X-ray transmission luminance obtained from the image sensor 16. Specifically, the evaluation unit 20 determines the quality of the fiber bundle 13 using the X-ray transmission luminance. The method for evaluating the fineness of the fiber bundle 13 will be described later. The evaluation unit 20 is signal-connected to the display device 21. The display device 21 displays the quality determination result of the fiber bundle 13 evaluated by the evaluation unit 20.

Next, the evaluation method of the fiber bundle 13 by the fiber sample evaluation system 14 will be described with reference to FIG.
In the evaluation method of the fiber bundle 13, first, the fiber bundle 13 which is a fiber sample is imaged (step S11). At this time, the X-ray L emitted from the X-ray source 15 is irradiated to the fiber bundle 13 transported in the transport direction Y, that is, the fiber bundle 13 passing between the X-ray source 15 and the image sensor 16. An X-ray transmission image of the fiber bundle 13 is recorded on the image sensor 16. When the X-ray transmission luminance is 8 bits, the X-ray transmission image of the fiber bundle 13 is recorded in the image sensor 16 by a gray scale of 256 gradations.

The X-ray transmission luminance becomes white (luminance 255 in the case of 8 bits) when the X-ray L is not absorbed by the fiber bundle 13 at all and is received by the image sensor 16. On the other hand, the X-ray transmission luminance becomes black (in the case of 8 bits, the luminance is 0) when the X-ray L is completely absorbed by the fiber bundle 13 and the image sensor 16 does not receive the X-ray. Therefore, as shown in FIG. 3A, in the X-ray transmission image of the fiber bundle 13 captured by the image sensor 16, theoretically, the portion of the fiber bundle 13 is black or gray, and there is no fiber bundle 13. The part becomes white. The X-ray transmission brightness between white (luminance 255) and black (luminance 0) varies depending on the fineness of the fiber bundle 13 according to Lambert-Beer's law.

As shown in FIG. 2, the X-ray transmission luminance inversion process is performed after step S11 (step S12).
X-ray transmission brightness is used to evaluate the fineness of the fiber bundle 13 by the fiber sample evaluation system 14. Specifically, the fineness of the fiber bundle 13 is evaluated using the brightness area obtained from the product of the X-ray transmission brightness and the width of the fiber bundle 13. In order to obtain the luminance area, it is necessary to rearrange the portion where the fiber bundle 13 is present from the portion where the fiber bundle 13 is not present based on the luminance. Therefore, the X-ray transmission luminance recorded on the image sensor 16 is inverted.

As shown in FIG. 3B, when the X-ray transmission luminance is inverted, the obtained X-ray transmission image is inverted in black and white between the portion of the fiber bundle 13 and the portion without the fiber bundle 13. Further, by performing the inversion process, the X-ray transmission luminance of the fiber bundle 13 is quantified. As a method of inverting the X-ray transmission brightness, use numerical calculation software when the X-ray transmission brightness is recorded as RAW data, and use image processing software when the X-ray transmission brightness is recorded as an image format file. .. Then, by associating the X-ray transmission luminance obtained by the inversion process with the width of the fiber bundle 13, the X-ray transmission luminance profile of the fiber bundle 13 is formed.

FIG. 4 shows an X-ray transmission luminance profile generated by associating the X-ray transmission luminance of the fiber bundle 13 with the width of the fiber bundle 13. The vertical axis of FIG. 4 corresponds to the X-ray transmission luminance, and the horizontal axis corresponds to the width of the fiber bundle 13. Here, the width of the fiber bundle 13 will be described. The light receiving surface of the image sensor 16 is composed of a plurality of pixels. The smallest unit constituting the light receiving surface is a pixel. Further, the direction orthogonal to the transport direction Y of the fiber bundle 13 is the width direction. That is, the width of the fiber bundle 13 is the number of pixels arranged in the width direction of the fiber bundle 13 in the projected portion where the fiber bundle 13 is projected on the image sensor 16.

As shown in FIG. 4, the X-ray transmission luminance profile of the columnar fiber bundle 13 is semi-elliptical. When the shape of the fiber bundle 13 changes from a columnar shape, the shape of the X-ray transmission luminance profile changes from a semi-elliptical shape, although not shown. For example, if the fiber bundle 13 is flat in the direction in which the X-ray source 15 and the image sensor 16 face each other and in the direction orthogonal to both the transport direction Y of the fiber bundle 13, the shape of the X-ray transmission luminance profile is semicircular. Similar. Further, if the fiber bundle 13 is flat in the direction in which the X-ray source 15 and the image sensor 16 face each other, the X-ray transmission luminance profile is similar to a semi-elliptical shape that is flatter than that of the columnar fiber bundle 13. .. Therefore, it is possible to evaluate the shape of the fiber bundle 13 from the shape of the X-ray transmission luminance profile of the fiber bundle 13.

In the X-ray transmission luminance profile, the luminance of the portion where the fiber bundle 13 does not exist is theoretically 0. The line connecting the portions having a luminance of 0 in the width direction is the baseline BL. However, the X-ray transmission brightness around the fiber bundle 13 may be other than 0 because the X-ray L is absorbed by the moisture in the air or the image sensor 16 has a manufacturing tolerance. In this case, the baseline BL is represented by a linear function or a quadratic function, and the accuracy of the luminance area may decrease when calculating the luminance area described above. Therefore, when the X-ray transmission luminance around the fiber bundle 13 is 1/100 or more of the X-ray transmission luminance of the fiber bundle 13 (YES in step S13), the baseline BL is corrected (step S14).

If the baseline BL can be represented by a linear function, fitting using the linear function is performed to correct the baseline BL. If the baseline BL can be represented by a quadratic function, fitting using the quadratic function is performed to correct the baseline BL. If baseline BL correction is not required (NO in step S13), processing proceeds to step S15. The fitting range of the baseline BL is specified in advance, or the range is changed according to the fluctuation of the fiber position or the like.

As shown in FIG. 2, in step S15, the luminance area is calculated. As described above, the X-ray transmission brightness varies depending on the fineness of the fiber bundle 13 according to Lambert-Beer's law. The higher the fineness of the fiber bundle 13, that is, the larger the fiber mass for a certain length of the fiber bundle 13, the higher the X-ray transmission luminance. On the other hand, if the fineness of the fiber bundle 13 is low, that is, if the fiber mass with respect to a certain length of the fiber bundle 13 is small, the X-ray transmission luminance is small.

The fineness of the fiber bundle 13 is the product of the X-ray transmission luminance of the fiber bundle 13 (the unit is dimensionless and is expressed as (-)) and the width of the fiber bundle 13 on the image sensor 16 (the unit is pixel). It is quantitatively evaluated by defining "brightness area (unit is pixel-)". The luminance area is calculated by the following equation 1.

Luminance area = X-ray transmission brightness / fiber bundle width ... Equation 1
The X-ray transmission luminance profile represents the X-ray transmission luminance of each pixel. The product of the X-ray transmission luminance and the width of the fiber bundle 13 is the area of the portion surrounded by the X-ray transmission luminance profile. This area is the luminance area. Therefore, it is shown that the larger the luminance area, the higher the fineness of the fiber bundle 13. By defining the brightness area of the fiber bundle 13 in this way, the fineness of the fiber bundle 13 can be quantitatively evaluated.

Further, the fineness of the fiber bundle 13 may be evaluated using ^{the luminance volume (unit: pixel 2} · −) in which the length of the fiber bundle 13 (unit is pixel) is added to the luminance area.
The luminance volume is calculated by the following equation 2.

Luminance volume = X-ray transmission brightness, fiber bundle width, fiber bundle length ... Equation 2
Further, the fineness of the fiber bundle 13 may be evaluated as the fineness including the length information by using the average brightness area (unit is −) which is the X-ray transmission brightness per unit length of the fiber bundle 13. .. The average luminance area is calculated by the following equation 3.

Average brightness area = X-ray transmission brightness per unit length / width of fiber bundle ... Equation 3
Further, in order to evaluate the fineness of the fiber bundle 13 more quantitatively, it is preferable to correct the fluctuation of the X-ray source 15. Therefore, the X-ray transmission luminance of the standard sample whose fineness is known may be recorded in the same field of view as the fiber bundle 13, and the fineness of the fiber bundle 13 may be evaluated as the ratio of the fineness of the standard sample.

Then, the evaluation unit 20 performs the process of step S15. That is, the evaluation unit 20 calculates the luminance area, the luminance volume, and the average luminance area, respectively.
In step S16, the evaluation unit 20 compares the calculated luminance area, luminance volume, and average luminance area with a preset threshold value to determine the quality of the fiber bundle 13. The evaluation unit 20 outputs a signal regarding the quality determination result of the fiber bundle 13 to the display device 21. The display device 21 displays the quality determination result of the fiber bundle 13.

Further, the evaluation unit 20 calculates the luminance area at a plurality of locations where the transport direction Y (passing direction) of the fiber bundle 13 is different, and the variation in fineness along the transport direction Y of the fiber bundle 13 from the plurality of luminance areas. That is, the variation in fineness along the longitudinal direction of the fiber bundle 13 may be evaluated.

According to the above embodiment, the following effects can be obtained.
(1) During the transportation of the fiber bundle 13, first, X-ray L is irradiated from the X-ray source 15 toward the fiber bundle 13. Then, the fineness of the fiber bundle 13 is evaluated using the X-ray transmission luminance obtained from the X-ray transmission image captured by the image sensor 16. Therefore, the fineness of the fiber bundle 13 can be quantitatively evaluated on the production line without cutting out a part of the fiber bundle 13 as an evaluation sample. Further, this method is a method of evaluating the fiber bundle 13 using the brightness area obtained from the product of the X-ray transmission brightness obtained by the image sensor 16 and the width of the fiber bundle 13. Therefore, it is not necessary to include a chemical substance in the fiber bundle 13, and the fiber bundle 13 that can be evaluated is not limited. Further, the X-ray transmission luminance is a value obtained from the X-ray transmission image, and the width of the fiber bundle 13 is also a dimension on the image sensor 16. Therefore, a lot of processing is not required to obtain the luminance area. Therefore, the evaluation of the fiber bundle 13 can be easily performed on the production line of the fiber bundle 13.

(2) By obtaining the luminance area at a plurality of locations where the fiber bundle 13 has different transport directions (passing directions), the fineness varies along the transport direction Y of the fiber bundle 13, that is, in the longitudinal direction of the fiber bundle 13. The variation in fineness along can be evaluated.

(3) The X-ray transmission luminance profile is a graph in which the X-ray transmission luminance is associated with the width of the fiber bundle 13. Further, the X-ray transmission luminance is a value that fluctuates according to the amount of fibers. Therefore, the shape of the fiber bundle 13 in the width direction can be evaluated non-contactly by the shape of the X-ray transmission luminance profile.

(4) By recording the X-ray transmission brightness in, for example, an 8-bit 256-gradation gray scale, the fineness of the fiber bundle 13 can be quantified as the brightness area. Therefore, it becomes easier to evaluate the fineness of the fiber bundle 13.

Hereinafter, examples in which the above embodiment is further embodied will be described.
(Example 1)
[Evaluation by X-ray transmission brightness profile and brightness area]
Using the fiber sample evaluation system 14 (manufactured by Beamsense Co., Ltd .: FLEX-M345), three fiber bundles (length 23.2 mm) were used as fiber samples. Of the three fiber bundles, the fiber bundle shown in FIG. 5 is referred to as the first fiber bundle S1, the fiber bundle shown in FIG. 6 is referred to as the second fiber bundle S2, and the fiber bundle shown in FIG. 7 is referred to as the third fiber bundle S3.

Then, the first to third fiber bundles S1 to S3 were irradiated with X-ray L from the X-ray source 15, and batch imaging was performed by the image sensor 16. The X-ray transmission image was stored in the image sensor 16 in an 8-bit Bitmap (.bmp) format. At this time, the X-ray intensity and the exposure time were adjusted so as not to cause blackout and overexposure in the X-ray transmission image.

Using ImageJ, which is image analysis software, the X-ray transmission luminance of an X-ray transmission image (an image having a length of 1400pixel) was inverted. Next, the X-ray transmission luminance profile at the center position in the longitudinal direction (length 700pixel) in the first to third fiber bundles S1 to S3 was manually baseline corrected. Baseline-corrected X-ray transmission luminance profiles are shown in FIGS. 8-10. FIG. 8 shows the X-ray transmission luminance profile of the first fiber bundle S1. FIG. 9 shows the X-ray transmission luminance profile of the second fiber bundle S2. FIG. 10 shows the X-ray transmission luminance profile of the third fiber bundle S3.

Next, the luminance area was obtained by numerically integrating the baseline-corrected X-ray transmission luminance profile (FIGS. 8 to 10) using Origin, which is graph creation and data analysis software.

The luminance area of the first fiber bundle S1 is 1725 (pixel · −), the luminance area of the second fiber bundle S2 is 3706 (pixel · −), and the luminance area of the third fiber bundle S3 is 1149 (pixel · −). )Met. The weight of the first fiber bundle S1 was 17 mg, the weight of the second fiber bundle S2 was 35 mg, and the weight of the third fiber bundle S3 was 7 mg.

As shown in FIGS. 8 to 10, the X-ray transmission luminance profile represents the shape of the first to third fiber bundles S1 to S3. By comparing the X-ray transmission luminance profiles, the difference in the shape of the fiber bundle can be evaluated. Further, the difference in the shape of the fiber bundle can be evaluated by comparing the luminance areas of the first to third fiber bundles S1 to S3. From these comparisons, it was shown that the thickest second fiber bundle S2 had the highest fineness, and the thinnest third fiber bundle S3 had the lowest fineness.

[Evaluation by brightness volume]
^{The luminance volume (pixel 2} · −) was obtained by multiplying the luminance area (pixel · −) of the first to third fiber bundles S1 to S3 by the length 1400 pixel. The brightness volume of the first fiber bundle S1 is 2415000 (pixel ² · −), the brightness volume of the second fiber bundle S2 is 5188400 (pixel ² · −), and the brightness volume of the third fiber bundle S3 is 1608600 (pixel 2 · −). ^2.- ).

Therefore, even if the luminance volumes of the first to third fiber bundles S1 to S3 are compared, the difference in the shape of the fiber bundles can be evaluated. From these comparisons, it was shown that the thickest second fiber bundle S2 had the highest fineness, and the thinnest third fiber bundle S3 had the lowest fineness.

[Evaluation by average brightness area]
The X-ray transmission luminance was averaged in the longitudinal direction of the first to third fiber bundles S1 to S3, and the baseline was manually corrected. The X-ray transmission luminance profile with baseline correction is shown in FIGS. 11 to 13. FIG. 11 shows the X-ray transmission luminance profile of the first fiber bundle S1. FIG. 12 shows the X-ray transmission luminance profile of the second fiber bundle S2. FIG. 13 shows the X-ray transmission luminance profile of the third fiber bundle S3.

The average luminance area (−) was obtained by numerically integrating the X-ray transmission luminance profiles shown in FIGS. 11 to 13 with baseline correction using Origin, which is graph creation and data analysis software.

The average luminance area (−) of the first fiber bundle S1 is 1475, the average luminance area (−) of the second fiber bundle S2 is 2987, and the average luminance area (−) of the third fiber bundle S3 is 612. rice field. Therefore, the difference in the shape of the fiber bundle can be evaluated by comparing the average luminance areas. From these comparisons, it was shown that the thickest second fiber bundle S2 had the highest fineness, and the thinnest third fiber bundle S3 had the lowest fineness.

(Example 2)
[Evaluation based on the average brightness area when the shape is changed]
Using the same method as in Example 1, the X-ray transmission luminance profile of the fiber bundles 1 to 5 was formed, and the average luminance area (−) was calculated.

The average luminance area (−) was obtained for each of the five fiber bundles 1 to 5 as a first state in which they were not loosened, a second state in which they were slightly loosened, and a third state in which they were loosened more than the second state. The result is shown in FIG.

(Example 3)
[Evaluation by average brightness area when the number is changed]
As in Example 2, the first state, the second state, and the third state are the same as in Example 2, except that two or three fiber bundles 1 to 5 of Example 2 are prepared and arranged in parallel. Each average luminance area (−) was obtained. The result when two fiber bundles are arranged is shown in FIG. 15, and the result when three fiber bundles are arranged is shown in FIG.

From FIGS. 14, 15, and 16, the average luminance area of the fiber bundles 1 to 5 is substantially constant regardless of the state of the fiber bundles. From this result, it was found that the average luminance area does not depend on the amount of space between the fiber bundles. Further, it is shown that the average luminance area (−) increases twice or three times as the number of fiber bundles 1 to 5 increases. From this result, it was found that there is a positive correlation between the fineness evaluated from the X-ray transmission luminance and the weight of the fiber bundle.

The above embodiment may be modified as follows.
The evaluation of the fineness may be performed by a person instead of the evaluation unit 20.
The display device 21 may be omitted from the fiber sample evaluation system 14.

When the fiber sample is inspected outside the production line instead of the fiber sample on the production line, the fiber sample evaluation method and the fiber sample evaluation system 14 may be adopted.

Claims (4)

It is an evaluation method for fiber samples.
Irradiating the fiber sample with X-rays from the X-ray source and
An X-ray transmission image of the fiber sample is imaged by an image sensor arranged opposite to the X-ray source so that the fiber sample is arranged between the X-ray source and the image sensor.
From the brightness area, which is the product of the X-ray transmission brightness obtained from the X-ray transmission image and the number of pixels corresponding to the width of the fiber sample among the pixels constituting the light receiving surface of the image sensor, the fiber sample A method for evaluating a fiber sample, which comprises evaluating the fineness. In the method for evaluating a fiber sample according to claim 1,
The direction in which the fiber sample passes between the X-ray source and the image sensor is defined as the passing direction, and the luminance area is obtained at a plurality of locations where the fiber sample passes in different directions.
A method for evaluating a fiber sample, which comprises evaluating a variation in fineness of the fiber sample along the passing direction from a plurality of the luminance areas. In the method for evaluating a fiber sample according to claim 1 or 2,
A method for evaluating a fiber sample, comprising evaluating the shape of the fiber sample from the shape of the X-ray transmission brightness profile in which the X-ray transmission luminance and the width of the fiber sample are associated with each other. It is a fiber sample evaluation system.
X-ray source and
An image sensor, which is an image sensor arranged to face the X-ray source so that a fiber sample is arranged between the X-ray source and the image sensor.
The product of the X-ray transmission brightness obtained from the X-ray transmission image of the fiber sample imaged by the image sensor and the number of pixels constituting the light receiving surface of the image sensor corresponding to the width of the fiber sample. A fiber sample evaluation system having an evaluation unit for evaluating the fineness of the fiber sample from a certain brightness area.

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