JPH05132853A - Ground paper for measuring yarn crimp property and a method for lighting the paper - Google Patents

Abstract

PURPOSE:To enable easy measurement of yarn crimp properties regardless of the color phase of the test yarn by projecting illumination beams to the test yarn fixed on a measurement paper board of which the ground is colored and the surface is mirror-finished, at an angle lower than a specific degree. CONSTITUTION:In the paper board for yarn measurement 28, its ground is colored in a dark tone such as black, dark brown or dark blue and its surface is mirror-finished. A test yarn 26 is fixed between the two pressure sensitive adhesive double coated tapes on the top and the bottom ends of said paper board 28 under an appropriate initial load. The illumination beams are projected to the test yarn 26 through a pair of optical fibers 25 at an angle (theta) lower than 45 deg., preferably 10 to 30 deg.. The reflected light is guided from the slit 24 of the hood 23 to lens 22, and simultaneously the incident light is reflected at the surface of the paper board 28 to turn toward the reflection board 27, then reflected again thereto for illumination near the test yarn. The data detected by CCD sensor 21 through lens 22 are inputted as the pattern data of the test yarn 26, as the paper board 28 moves in the lengthwise direction of the yarn 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount used for measuring the crimp characteristics of yarns and a lighting method for the mount.

[0002]

2. Description of the Related Art Conventionally, the crimp characteristic of a yarn, for example, the crimp characteristic of a synthetic fiber staple is measured according to JIS. According to JIS, the length a when the initial load W ₁ is applied to the sample yarn is measured, and then the length b of 30 seconds is measured by applying the specified load W ₂ . Then, after removing all the loads and leaving for 2 minutes, the initial load W ₁ is applied to measure the length c, and the crimping rate [%] = ((b−a) / b) × 100 residual crimping rate [% ] = ((B−c) / b) × 100 Crimped elastic modulus [%] = ((b−c) / (b−a)) × 10
The crimping rate and the like are obtained by the calculation formula of 0. The crimping rate and the residual crimping rate are said to be represented by an average value obtained by measuring the number of tests 20 times. It is specified that the number of crimps is calculated by counting the number of crimps having a sample length of 25 mm in the state where an initial load is first applied and expressing the average value of 20 tests.

As described above, it is difficult to automate the measurement of crimp characteristics defined in JIS standard, and since it takes an average value of 20 times, it requires a lot of manpower and precise measurement. Therefore, there is a problem that a skilled engineer is required. The yarn crimp characteristic measuring device described in Japanese Patent Publication No. 61-36114 can automatically measure the crimp characteristic, but the number of crimps must be visually measured. However, the problem of requiring manpower has not been solved.

Further, the fiber crimp characteristic measuring device described in JP-A-1-183532 can read the number of peaks and the number of valleys by using a line sensor camera to measure the number of crimps, and the load. By providing the applying means, the crimp rate and the residual crimp rate can be automatically measured.

However, in these measuring devices, in order to measure a large number of samples, the sample thread has to be set between the chucks each time the measurement is performed, and the problem that manpower is required remains. Regarding the setting of the sample thread, there is also a method of setting a sample thread of an appropriate length in the device each time measurement is performed, or a method of using a sample fixed to a mount 31 as shown in FIG. The mount 31 can fix 20 pieces of the sample thread 32, and is divided by printing a dividing line 33 indicating the attaching position. Each of the sample threads collected from several parts where the crimps are not damaged,
Allow 25 ± 5% of slack in the section by the display line,
Fix both ends with adhesive. At the time of measurement, the mount 31 is cut at the division line 33, and one sample thread is fixed to the strip-shaped mount, and one of them is attached to the chuck of the above-described measuring device. Then, the mount is cut to free the sample yarn, and a load is applied for measurement.

In the fiber crimp characteristic measuring device described in the above-mentioned JP-A-1-183532, the sample yarn 32 is attached to the chuck of the measuring device in a state of being separated from the mount, and measured by a line sensor camera. Is to do. However, since the sample thread set on the chuck is three-dimensional and the directions of the peaks and valleys are various, the peaks and valleys do not always appear two-dimensionally on the line sensor camera, and the peaks that cannot be recognized are not recognized. And a valley will occur. The depth of focus of the optical system of the line sensor camera also becomes a problem, and there is also a problem that a portion located outside the depth of focus cannot be captured by the line sensor camera due to blurring.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a mount suitable for a method of measuring in a state of being fixed to the mount, and the mount. On the other hand, it is an object of the present invention to provide an illumination method that is easily visible.

[0008]

According to the invention of claim 1, the mount for crimp characteristic measurement is characterized in that the ground color is colored and the surface is a mirror surface. The invention of claim 2 is characterized by an illuminating method in which a light beam is projected onto the thread fixed to the mount at an angle of 45 ° or less with respect to the mount surface. The background color of the mount is more preferably a dark color, and more preferably black. Further, the angle of the light beam with the mount surface is
10 to 30 ° is more suitable.

[0009]

According to the present invention, since the sample yarn is measured while being fixed on the measuring mount, the automation is easy, and the measuring mount has a ground color and the surface is a mirror surface. For the fixed sample thread,
Light rays projected at an angle of ≤ ° are not reflected upward from the mount surface. Therefore, when observing the sample thread from the top or observing it with an imaging device, only the light that hits the sample thread is reflected to the top, and it looks as if the sample thread is floating in the space, making observation easy. Becomes

The measuring method using the sample of the present invention is
The measured value is not exactly as specified in the JIS standard, so the measured value does not necessarily match the measured value according to JIS, but it is reproducible data, so it has meaning as data that specifies the measuring method. Is. Further, if a correction coefficient with respect to the data obtained by the measuring method of the present invention is obtained in advance on the basis of the data measured by JIS for a predetermined sample yarn, the values measured by JIS will be correlated with respect to the same material. It is also possible to obtain.

[0011]

1 is a plan view of an embodiment of a measuring mount of the present invention. In the figure, 11 is a mount for measurement, 12 and 13 are double-sided adhesive tapes, and 14 is a sample thread. Measurement mount 11
In this example, the size is about 40 mm in length and 100 mm in width, the ground color is black, and by calendaring,
A stiff paper having an improved surface smoothness was used. Supercalendered paper has higher smoothness and improved specularity. Other materials such as plastics and metal plates can also be used. Double-sided adhesive tapes 12 and 13 having a width of about 5 mm are attached to the top and bottom. The upper end of the sample thread 14 is adhered to the double-sided adhesive tape 12, and the lower end of the sample thread 14 is adhered to the double-sided adhesive tape 13 with a proper initial load applied. Since the sample threads 14 are adhered so as to be arranged at intervals of 5 mm, 20 sample threads can be set on this mount 11. If a mark such as a print mark or a through hole indicating the set position of the sample yarn 14 is provided on the mount 11, the set position can be indicated and the sample yarn can be automatically measured sequentially by detecting the mark during measurement. Can be used as a detection mark.

FIG. 2 is a schematic constitutional view for explaining an embodiment of an illuminating method for reading a sample thread by using the above-mentioned measuring mount. FIG. 2A is a side view and FIG. The figure is a plan view of the main part. In the figure, 21 is a CCD line sensor, 22 is a lens, 23 is a hood, 24 is a slit, and 2
5 is an optical fiber, 26 is a sample thread, 27 is a reflecting plate, and 28 is a measuring mount.

The CCD line sensor 21 includes a lens 22.
By reading the sample yarn 26 from directly above via the, and moving the measurement mount 28 in the length direction of the sample yarn 26,
The pattern data of the sample thread can be obtained. Sample thread 2
Illumination 6 is provided by two optical fibers 25 in this embodiment. That is, illumination light from a light source (not shown), for example, a halogen light source is guided from the optical fiber 25 to illuminate the observation region of the sample thread 26. A reflection plate 27 having a curved surface is provided on the opposite side of the optical fiber 25 with the sample thread 26 interposed therebetween. The optical fiber 25 is set such that the projection angle θ of the illumination light is 45 ° or less with respect to the sample yarn. The reflection plate 27 is also attached so as to direct the light beam of this angle to the observation region of the sample thread 26. Therefore, the illumination light from the optical fiber 25 illuminates the sample thread 26 from diagonally above, and the reflected light thereof is reflected by the hood 2.
It is introduced into the lens 22 from the slit 24 of 3. Also,
Most of the light rays incident on the surface of the measurement mount 28 from the optical fiber 25 are specularly reflected and are directed to the reflection plate 27. The smaller this angle is, the smaller the component toward the slit can be. However, if the angle is too small, it is difficult to illuminate the upper portion of the sample thread 26. Therefore, it is more preferable to provide an illumination with an angle of 10 to 30 °. The reflected light from the reflection plate 27 also illuminates the vicinity of the sample thread 26 at the same angle. Since the surface of the measuring mount 28 is a mirror surface, the reflected light on the surface has a very small component directed to the slit 24, and only the light impinging on the sample thread 26 is reflected upward, and when viewed from directly above, it is as if the sample. The thread 26 appears to float in the space, and the sample thread can be observed in the best condition. When the ground color of the measuring mount 28 is black, the colors of the sample threads are white, black, brown, gray, red, orange, yellow, green,
All yarns such as blue and translucent were clearly observed. The ground color does not necessarily have to be black, but dark brown,
Dark colors such as dark blue are preferred.

Based on the pattern data read by the CCD sensor, the number of peaks and valleys can be detected to measure the number of crimps, and the distance between adjacent data can be calculated by the Pythagorean theorem and integrated. Thus, the length of the pattern can be calculated, and the crimp ratio can be calculated from the calculation result.

[0015]

As is apparent from the above description, according to the present invention, it is possible to provide a mount for measurement in which the sample yarn can be easily observed, and an illumination method suitable for the mount for measurement. There is.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a measurement mount of the present invention.

FIG. 2 is a schematic configuration diagram for explaining an illumination method of the present invention.

FIG. 3 is a plan view of a conventional liner mount.

[Explanation of symbols]

 11 Measurement Mount 12, 13 Double-sided Adhesive Tape 14 Sample Thread 21 CCD Line Sensor 22 Lens 23 Hood 24 Slit 25 Optical Fiber 26 Sample Thread 27 Reflector 28 Measurement Mount

Claims (2)

[Claims] 1. A mount for measuring the crimp characteristics of a yarn, wherein the ground color is colored and the surface is a mirror surface. 2. A light ray is projected at an angle of 45 ° or less with respect to a liner having a ground color and having a mirror surface on the liner fixed to a liner for measuring crimp characteristics. A lighting method characterized by the above.