CN107687967B - Method for testing stiffness of clothing fabric - Google Patents
Method for testing stiffness of clothing fabric Download PDFInfo
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- CN107687967B CN107687967B CN201710841821.1A CN201710841821A CN107687967B CN 107687967 B CN107687967 B CN 107687967B CN 201710841821 A CN201710841821 A CN 201710841821A CN 107687967 B CN107687967 B CN 107687967B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
Abstract
the invention discloses a method for testing the stiffness of a fabric. The softness and comfort of the fabric are related to the stiffness. Step one, cutting a fabric to be detected into a rectangular sample. And step two, drawing a marking line on the rectangular sample. And step three, folding the rectangular sample in half by taking the connecting line of the midpoints of the two width edges as a crease, and fixing the folded rectangular sample by using a pin, wherein the pin penetrates through the marking line. And obtaining a butterfly-shaped sample. And step four, placing the butterfly-shaped sample on a sample placing position of the test bed. And fifthly, shooting overlooking pictures of the butterfly-shaped sample by using a first camera, and shooting side-looking pictures of the butterfly-shaped sample by using a second camera. And step six, obtaining the width D, the overlooking area S and the height H of the butterfly-shaped sample according to the overlooking picture and the side-looking picture. The invention can judge the stiffness condition of the rectangular sample by folding the rectangular sample into a bow-tie shape and taking a picture, and is convenient and quick.
Description
Technical Field
The invention belongs to the technical field of textile garment performance testing, and particularly relates to a garment fabric stiffness testing method.
Background
The textile is an essential daily article in people's life, and with the rapid development of economy in recent years, the requirements of people on the textile are changed from the prior practicability and durability into excellent hand feeling, comfort and aesthetic property. Fabrics used to make body-fitting garments need to have good softness and comfort, and fabrics used to make coats need to have good stiffness, drape.
Researches find that the performances have a certain relation with the stiffness of the fabric, the existing fabric stiffness testing methods are common in a slope method, a heart-shaped method and the like, the testing methods have application ranges and limitations, but the common problem is that only one group of experimental results can be obtained in each test, the average calculation cannot be carried out under the condition of only completing one test, and more accurate results can be obtained.
Disclosure of Invention
the invention aims to provide a method for testing the stiffness of a garment fabric.
The fabric stiffness testing device adopted by the invention comprises a test bed, a first camera and a second camera. The lens of the first camera faces directly below. And the sample placing position on the test bed is positioned right below the first camera lens. The lens of the second camera is horizontally arranged and faces to the sample placing position on the test bed.
the invention specifically comprises the following steps:
Firstly, ironing the fabric to be tested, and cutting the fabric to be tested into rectangular samples of a multiplied by b, wherein a is larger than b and larger than 1 cm.
And step two, drawing a marking line on the rectangular sample. The marked line is the connecting line of the midpoints of two length sides of the rectangular sample.
and step three, folding the rectangular sample in half by taking the connecting line of the midpoints of the two width edges as a crease, and fixing the rectangular sample by using pins, wherein the pins penetrate through the marking line. And obtaining a butterfly-shaped sample.
And step four, placing the butterfly-shaped sample on a sample placing position of the test bed, enabling the opening of the butterfly-shaped sample to be arranged upwards, and enabling one width edge of the butterfly-shaped sample bent into an arc shape to be opposite to a lens of the second camera.
and fifthly, shooting overlooking pictures of the butterfly-shaped sample by using a first camera, and shooting side-looking pictures of the butterfly-shaped sample by using a second camera.
and step six, dividing the butterfly-shaped sample in the overlooking photo into a first butterfly wing-shaped sample and a second butterfly wing-shaped sample by taking the pin as a boundary. And (5) sequentially executing the step seven when the i is 1 and the 2.
And step seven, obtaining the width D i, the top view area S i and the height H i of the ith butterfly-shaped sample according to the top view picture and the side view picture, wherein the width D i is the distance between two end points of the width side of the butterfly-shaped sample in the ith butterfly-shaped sample, the top view area S i is the area of the ith butterfly-shaped sample in the top view picture, and the height H i is the distance between the end point of the width side of the butterfly-shaped sample in the ith butterfly-shaped sample and the test bed in the side view picture.
And step eight, calculating the average width D, the average top view area S and the average height H, wherein the average width D is 1/2(D 1 + D 2), the average top view area S is 1/2(S 1 + S 2) and the average height H is 1/2(H 1 + H 2).
the larger the average width D, the lower the stiffness of the fabric to be tested. The larger the average overlook area S is, the smaller the stiffness of the fabric to be measured is. The greater the average height H, the greater the stiffness of the fabric to be tested.
and further, in the seventh step, an opening angle theta i of the ith butterfly wing-shaped test sample is obtained according to the overlook picture, the vertex of the opening angle theta i is the point where the stud is located, two rays of the opening angle theta i respectively pass through a quarter point of the length sides of the two butterfly wing-shaped test samples, and the two rays are intersected with the ith butterfly wing-shaped test sample.
and step eight, calculating an average field angle theta, wherein theta is 1/2 (theta 1 + theta 2), and the larger the average field angle theta is, the smaller the stiffness of the fabric to be tested is.
and further, in the seventh step, an opening angle theta i of the ith butterfly wing-shaped test sample is obtained according to the overlook picture, the vertex of the opening angle theta i is the point where the stud is located, two rays of the opening angle theta i respectively pass through the inflection points of the length sides of the two butterfly wing-shaped test samples, and the two rays are intersected with the ith butterfly wing-shaped test sample.
and step eight, calculating an average field angle theta, wherein theta is 1/2 (theta 1 + theta 2), and the larger the average field angle theta is, the smaller the stiffness of the fabric to be tested is.
further, the specific method for determining the width D i, the plan view area S i and the height H i of the ith butterfly wing sample in the step seven is as follows:
firstly, importing overlooking photos into autoCAD software;
Secondly, obtaining the width D i, namely clicking the tool, the query and the distance in sequence, and selecting two end points of the width edge of the butterfly-shaped sample in the ith butterfly-shaped sample to obtain the width D i;
Thirdly, calculating the overlooking area S i, namely clicking the tool, the query and the area in sequence, and dotting the outer contour of the ith butterfly wing-shaped sample to obtain the overlooking area S i;
fourthly, importing the side-view picture into autoCAD software;
And fifthly, obtaining the height H i, namely clicking the 'tool', 'query' and 'distance' in sequence, and selecting the middle point and the ith end point of the width edge of the butterfly-shaped sample in the side-view picture to obtain the height H i.
Further, a specific method for calculating the opening angle θ i of the butterfly-shaped sample in the step seven is as follows:
firstly, importing overlooking photos into autoCAD software;
And secondly, obtaining a flare angle theta i, namely connecting the point where the stud is located with a line segment and a quarter point of the length edge of the two butterfly-shaped samples on the ith butterfly-shaped sample, sequentially clicking the tool, the query and the angle, and selecting the two drawn line segments to obtain the flare angle theta i.
Further, a specific method for calculating the opening angle θ i of the butterfly-shaped sample in the step seven is as follows:
Firstly, importing overlooking photos into autoCAD software;
And secondly, solving a flare angle theta i, namely connecting the point where the stud is located with the inflection point of the two butterfly-shaped test samples with the length side of the ith butterfly-shaped test sample by using a line segment, sequentially clicking the tool, the query and the angle, and selecting the two drawn line segments to obtain the flare angle theta i.
Further, the fabric stiffness testing device adopted by the invention also comprises a camera fixing frame. The camera fixing frame consists of a fixing flat plate and four telescopic supporting legs. The top ends of the four telescopic supporting legs are respectively fixed with four corners of the fixed flat plate, and the bottom ends of the four telescopic supporting legs are fixed with the test bed. The middle position of the fixed flat plate is provided with a lens through hole. The first camera is placed on the stationary plate. The lens of the first camera is positioned at the lens through hole. The second camera is positioned on the symmetrical plane of two adjacent telescopic supporting legs.
furthermore, after the marking line is drawn in the second step, a fixed point is drawn at a quarter point of the marking line. And in the third step, the pin passes through the fixed point.
The invention has the beneficial effects that:
1. The invention folds a rectangular sample into a butterfly-shaped sample for detection. Because the butterfly-shaped sample consists of two butterfly-shaped samples, the invention can obtain two groups of test data and obtain an average value according to the two groups of test data, so that the test data is more accurate and reliable, and less fabrics are consumed for the test.
2. The invention can judge the stiffness condition of the rectangular sample by folding the rectangular sample into a bow-tie shape and taking a picture, and is convenient and quick.
3. The invention has simple and convenient operation and reliable measuring result.
drawings
FIG. 1 is a schematic view of the overall structure of a fabric stiffness testing device used in the present invention;
FIG. 2 is a schematic view of a rectangular sample in the present invention;
FIG. 3 is a schematic top view of a butterfly shaped test piece of the present invention;
FIG. 4 is a schematic side view of a butterfly sample of the present invention;
FIG. 5 is a schematic diagram of the present invention showing the field angle according to one quarter;
FIG. 6 is a schematic diagram of finding an opening angle according to an inflection point in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a method for testing the stiffness of a fabric of a garment, which uses a stiffness testing device of the fabric, comprises a test bed 1, a camera fixing frame 2, a first camera 3 and a second camera 5. The camera fixing frame 2 consists of a fixing flat plate and four telescopic supporting legs. The top ends of the four telescopic supporting legs are respectively fixed with four corners of the fixed flat plate, and the bottom ends of the four telescopic supporting legs are fixed with the test bed 1. The middle position of the fixed flat plate is provided with a lens through hole. The first camera 3 is placed on a stationary plate. The lens of the first camera 3 is located at the lens through hole and faces right below. The sample placement on the test stand 1 is located directly below the lens of the first camera 3. The butterfly-shaped sample 4 to be photographed is placed on the sample placement place. The first camera 3 takes a top view of the place where the sample is placed on the test bed from the lens through hole. The second camera 5 is placed on the test stand 1 with its lens facing the place on the test stand where the specimen is placed. The second camera 5 is located on the symmetry plane of two adjacent telescopic legs.
The invention specifically comprises the following steps:
firstly, ironing and flattening the fabric to be measured, and cutting the fabric to be measured into rectangular samples of 6cm multiplied by 4 cm.
Step two, as shown in fig. 2, a marking line 6 is drawn on the rectangular sample. The reference line 6 is a line connecting the midpoints of the two length sides of the rectangular sample. And a fixed point 8 is drawn at the quarter point of the marking line 6.
And step three, as shown in fig. 3, folding the rectangular sample in half by taking the connecting line of the midpoints of the two width edges as a crease 7, fixing the rectangular sample by using a pin 9, and enabling the pin 9 to penetrate through a fixing point 8 to obtain the butterfly-shaped sample 4.
And step four, placing the butterfly-shaped sample 4 on a sample placing position of the test bed 1, enabling the opening of the butterfly-shaped sample 4 to be arranged upwards (namely, the crease 7 is contacted with the test bed), and enabling one width edge 4-1 of the butterfly-shaped sample bent into an arc shape to be opposite to the lens of the second camera 5.
and fifthly, after the focal lengths of the first camera 3 and the second camera 5 are adjusted, the first camera 3 is used for shooting overlooking pictures of the butterfly-shaped sample 4, and the second camera 5 is used for shooting side-looking pictures of the butterfly-shaped sample 4. The top view photograph is shown in fig. 3 and the side view photograph is shown in fig. 4.
and step six, dividing the butterfly-shaped sample 4 in the overlooking picture into a first butterfly wing-shaped sample and a second butterfly wing-shaped sample by taking the pin as a boundary. When i is 1,2, the plan view photograph and the side view photograph are imported into autoCAD software. And step seven is executed in sequence.
And seventhly, utilizing the function of the auto CAD software for inquiring the area, the distance and the angle of the graph, obtaining the width D i, the overlooking area S i and the opening angle theta i of the ith butterfly-shaped sample, obtaining the distance between two end points of the width edge 4-1 of the butterfly-shaped sample in the ith butterfly-shaped sample by the width D i, obtaining the width D i of the overlooking area S i of the area D i, namely the area of the ith butterfly-shaped sample in the overlooking picture, sequentially clicking the tool, the inquiring tool and the area S i, sequentially clicking the inflection point, drawing points on the outer contour of the ith butterfly-shaped sample, obtaining the overlooking area S i, taking the vertex of the opening angle theta i as the vertex of the point of the tack, respectively passing through the length of the butterfly-shaped sample of the two rays of the opening angle theta 4-2, and obtaining the lengths of the butterfly-shaped sample (the length of the butterfly-shaped sample is respectively obtained by clicking the bow angle of the butterfly-shaped sample, and drawing the two sections of the butterfly-shaped sample, wherein the two rays of the butterfly-shaped sample pass through the butterfly-shaped sample, the four points are respectively located on the butterfly-shaped sample, and the butterfly-shaped sample, wherein the two lines of the butterfly-shaped sample is respectively located on the butterfly-shaped sample, the vertex angle theta-shaped sample is obtained by clicking the operation step 364, the operation line sections, the four-6, the four-drawing the operation steps of the bow-shaped sample is respectively, the bow-shaped sample, and the bow-shaped sample is respectively, wherein the two lines of the two.
and the operation step of obtaining the height H i is to click the tool, the query and the distance in turn, select the middle point and the end point of the width side 4-1 of the butterfly-shaped sample in the side-looking photo and obtain the height H i (namely the Y-direction increment of the end point and the middle point of the width side 4-1 of the butterfly-shaped sample in the side-looking photo).
and step eight, calculating an average width D, an average top view area S, an average opening angle theta and an average height H, wherein the average width D is 1/2(D 1 + D 2), the average top view area S is 1/2(S 1 + S 2), the average opening angle theta is 1/2 (theta 1 + theta 2), and the average height H is 1/2(H 1 + H 2).
the larger the average width D, the lower the stiffness of the fabric to be tested. The larger the average overlook area S is, the smaller the stiffness of the fabric to be measured is. The larger the average opening angle theta is, the smaller the stiffness of the fabric to be tested is. The greater the average height H, the greater the stiffness of the fabric to be tested.
Claims (8)
1. A method for testing the stiffness of clothing fabric is characterized by comprising the following steps: the adopted fabric stiffness testing device comprises a test bed, a first camera and a second camera; the lens of the first camera faces to the right lower side; the sample placing position on the test bed is positioned right below the first camera lens; the lens of the second camera is horizontally arranged and faces to a sample placing position on the test bed;
The method for testing the stiffness of the clothing fabric comprises the following steps:
Firstly, ironing a fabric to be detected, and cutting the fabric to be detected into rectangular samples of a multiplied by b, wherein a is larger than b and larger than 1 cm;
Drawing a marking line on the rectangular sample; the marking line is a connecting line of midpoints of two length sides of the rectangular sample;
Step three, folding the rectangular sample in half by taking a connecting line of midpoints of two width edges as a crease, and fixing the rectangular sample by using pins, wherein the pins penetrate through the marking line; obtaining a butterfly-shaped sample;
placing the butterfly-shaped sample on a sample placing position of the test bed, enabling an opening of the butterfly-shaped sample to be arranged upwards, and enabling one width edge of the butterfly-shaped sample bent into an arc shape to be opposite to a lens of the second camera;
Fifthly, shooting an overlook photo of the butterfly-shaped sample by using a first camera, and shooting a side view photo of the butterfly-shaped sample by using a second camera;
Step six, dividing the butterfly-shaped sample in the overlooking photo into a first butterfly wing-shaped sample and a second butterfly wing-shaped sample by taking a pin as a boundary; 1,2, and sequentially executing a step seven;
Seventhly, obtaining the width D i, the overlooking area S i and the height H i of the ith butterfly-shaped sample according to the overlooking picture and the side view picture, wherein the width D i is the distance between two end points of the width side of the butterfly-shaped sample in the ith butterfly-shaped sample, the overlooking area S i is the area of the ith butterfly-shaped sample in the overlooking picture, and the height H i is the distance between the end point of the width side of the butterfly-shaped sample in the ith butterfly-shaped sample in the side view picture and the test bed;
Step eight, calculating an average width D, an average top view area S and an average height H, wherein the average width D is 1/2(D 1 + D 2), the average top view area S is 1/2(S 1 + S 2), and the average height H is 1/2(H 1 + H 2);
the larger the average width D is, the smaller the stiffness of the fabric to be measured is; the larger the average overlook area S is, the smaller the stiffness of the fabric to be measured is; the greater the average height H, the greater the stiffness of the fabric to be tested.
2. the method for testing the stiffness of the clothing fabric according to claim 1, wherein in the seventh step, an opening angle theta i of the ith butterfly wing-shaped test sample is obtained according to a top-view picture, the vertex of the opening angle theta i is the point of a tack, two rays of the opening angle theta i respectively pass through a quarter point of the length sides of the two butterfly wing-shaped test samples, and both the two rays intersect with the ith butterfly wing-shaped test sample;
and step eight, calculating an average opening angle theta, wherein theta is 1/2 (theta 1 + theta 2), and the larger the average opening angle theta is, the smaller the stiffness of the fabric to be tested is.
3. The method for testing the stiffness of the garment fabric according to claim 1, wherein in the seventh step, an opening angle theta i of the ith butterfly wing-shaped test sample is obtained according to a top-view picture, the vertex of the opening angle theta i is a point where a tack is located, two rays of the opening angle theta i respectively pass through inflection points of length edges of the two butterfly wing-shaped test samples, and the two rays are intersected with the ith butterfly wing-shaped test sample;
And step eight, calculating an average opening angle theta, wherein theta is 1/2 (theta 1 + theta 2), and the larger the average opening angle theta is, the smaller the stiffness of the fabric to be tested is.
4. The method for testing the stiffness of a garment fabric according to claim 1, wherein the specific method for determining the width D i, the top view area S i and the height H i of the ith butterfly wing shaped test piece in the seventh step is as follows:
firstly, importing overlooking photos into autoCAD software;
secondly, obtaining the width D i, namely clicking the tool, the query and the distance in sequence, and selecting two end points of the width edge of the butterfly-shaped sample in the ith butterfly-shaped sample to obtain the width D i;
Thirdly, calculating the overlooking area S i, namely clicking the tool, the query and the area in sequence, and dotting the outer contour of the ith butterfly wing-shaped sample to obtain the overlooking area S i;
Fourthly, importing the side-view picture into autoCAD software;
and fifthly, obtaining the height H i, namely clicking the 'tool', 'query' and 'distance' in sequence, and selecting the middle point and the ith end point of the width edge of the butterfly-shaped sample in the side-view picture to obtain the height H i.
5. The method for testing the stiffness of the garment fabric according to claim 2, wherein the specific method for calculating the opening angle theta i of the butterfly-shaped sample in the seventh step is as follows:
firstly, importing overlooking photos into autoCAD software;
And secondly, obtaining a flare angle theta i, namely connecting the point where the stud is located with a line segment and a quarter point of the length edge of the two butterfly-shaped samples on the ith butterfly-shaped sample, sequentially clicking the tool, the query and the angle, and selecting the two drawn line segments to obtain the flare angle theta i.
6. the method for testing the stiffness of the garment fabric according to claim 3, wherein the specific method for calculating the opening angle theta i of the butterfly-shaped sample in the seventh step is as follows:
firstly, importing overlooking photos into autoCAD software;
And secondly, solving a flare angle theta i, namely connecting the point where the stud is located with the inflection point of the two butterfly-shaped test samples with the length side of the ith butterfly-shaped test sample by using a line segment, sequentially clicking the tool, the query and the angle, and selecting the two drawn line segments to obtain the flare angle theta i.
7. The method for testing the stiffness of a garment fabric according to claim 1, wherein: the adopted fabric stiffness testing device also comprises a camera fixing frame; the camera fixing frame consists of a fixing flat plate and four telescopic supporting legs; the top ends of the four telescopic supporting legs are respectively fixed with four corners of the fixed flat plate, and the bottom ends of the four telescopic supporting legs are fixed with the test bed; a lens through hole is formed in the middle of the fixed flat plate; the first camera is placed on the fixed flat plate; the lens of the first camera is positioned at the lens through hole; the second camera is positioned on the symmetrical plane of two adjacent telescopic supporting legs.
8. The method for testing the stiffness of a garment fabric according to claim 1, wherein: drawing a mark line, and drawing a fixed point at a quarter point of the mark line; and in the third step, the pin passes through the fixed point.
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| CN201710841821.1A CN107687967B (en) | 2017-09-18 | 2017-09-18 | Method for testing stiffness of clothing fabric |
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| CN201710841821.1A CN107687967B (en) | 2017-09-18 | 2017-09-18 | Method for testing stiffness of clothing fabric |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142690B (en) * | 2018-08-09 | 2020-11-03 | 浙江理工大学 | Multi-direction stiffness testing method for clothing fabric |
| CN109884062B (en) * | 2019-04-09 | 2021-05-14 | 江南大学 | Method for evaluating shape retention of fabric |
| CN111579387B (en) * | 2020-05-08 | 2023-07-28 | 杭州万事利丝绸数码印花有限公司 | Method and device for testing softness of clothing fabric |
| CN113324849B (en) * | 2021-06-08 | 2022-11-11 | 浙江理工大学 | Multi-direction garment stiffness evaluation method based on single sample |
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| CN100427929C (en) * | 2005-12-20 | 2008-10-22 | 东华大学 | Image testing method for fabric dynamic and static drapability and testing apparatus thereof |
| CN100523781C (en) * | 2006-11-17 | 2009-08-05 | 天津工业大学 | Testing apparatus for stiffness and softness of woof |
| CN203164131U (en) * | 2013-04-18 | 2013-08-28 | 浙江理工大学 | Fabric draping property testing device |
| CN103728440B (en) * | 2014-01-17 | 2015-06-17 | 浙江理工大学 | Multi-direction stiffness test device and method for fabric |
| CN203643345U (en) * | 2014-01-17 | 2014-06-11 | 浙江理工大学 | Fabric crease resistance testing device for simulating practical dressing |
| US10453664B2 (en) * | 2015-04-21 | 2019-10-22 | Battelle Memorial Institute | Collection, release, and detection of analytes with polymer composite sampling materials |
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