What is the density of woven fabric?
Density: The number of warp yarns and the number of weft yarns per unit length of the woven fabric under wrinkle-free and tension-free conditions.
Density: The number of warp yarns contained in the latitudinal unit length of the fabric.
Weft density: The number of weft yarns contained in the unit length along the warp direction of the fabric.
Test Methods
A Fabric Decomposition Method: Suitable for all woven fabrics, especially complex structures. As an arbitration method, the advantages: accuracy; disadvantages: slow
B Fabric analysis mirror method: suitable for fabrics with more than 50 yarns per cm, less used.
C Mobile fabric density mirror method: suitable for all fabrics. Common methods, fast and accurate.
Test procedure
1. Observe the structure of the fabric and the thickness of the yarn. Select the appropriate method. The laboratory mainly chooses Method A and Method C. The operation of Method B is simple and will not be explained in detail here.
A. Decomposition method 1 Remove the yarn at the edge of the sample, measure the length slightly larger than the specified size with a steel ruler, and cut it with scissors.
2 Use the needle to mark the specified size and remove it from the edge. For the convenience of counting, the yarns can be arranged in groups of 10 to obtain the number of warp or weft yarns within the specified length.
B. Mobile fabric density mirror table lamp, density mirror steel ruler: pressed on the light and thin fabric to ensure that the fabric is flat and the fabric does not slide when the density mirror moves. 1 Place the density mirror on the fabric surface, so that the marking line and scale under the magnifying glass The 0 point alignment on the ruler ensures that the scale on the density mirror is parallel to the other system yarn outside the system under test.
2 Turn the screw to count the number of yarns within the specified measuring distance.
Counting points:
Normally, the starting point is located between the two yarns, and the end point is located on the last yarn. Less than 0.25 is not counted, 0.25 to 0.75 are recorded as 0.5, and 0.75 or more is recorded as one.
2. The result is uniformly converted into root/10cm, if necessary, converted to inches: 1 inch = 2.54 cm, ie: 100.0 roots/10cm = 25.4 roots/inch. The scale of the density mirror needs to be perpendicular to the warp direction.
Second, the structure of the fabric with a cyclical structure determines the number of tissue cycles within the unit of measurement through the cyclical structure of the tissue structure; the number of yarns per tissue cycle is determined by tissue analysis or decomposition.
Fabric Density = Number of Tissue Cycles × Number of Yarns in Tissue Cycle + Number of Remaining Yarns
3 lower 1 upper 1 lower 1 upper, 6 yarns per cycle; 30 cycles zero and 3 in 5cm; then the number of yarns is 6*30+3=183 assumes 140 yarns per cycle, 4 The cycle requires 13 cm, and the number of yarns within 5 cm is: (140 ÷ (13 ÷ 4)) * 5 = 215.5.
More examples:
1. Color fabric with recycled pattern. The fabric can be used in two ways.
a, number pattern cycle: each pattern is composed of a hexagonal pattern, count how many yarns each pattern includes, and then count how many patterns in the minimum measurement distance, according to the previous formula
b. Personal recommendation method: the number of several color yarn cycles, as shown in the figure is that there are two blue yarns and six black yarns, and a total of eight is a group, as long as the number of color yarns in the minimum measurement distance is counted.
2, jacquard fabric jacquard fabric: warp and weft yarn intertwined and floating, forming a different, bumpy pattern.
At first glance, this fabric will definitely be intimidated by this complicated pattern. If the number of patterns is long, it may not be correct.
The patterned and unpatterned areas have the same number of warp and weft yarns. Therefore, the number density can be selected by a long distance of the basic organization. After the number is counted, it is converted into the number of yarns within 10cm.
3, corduroy fabric corduroy tissue uses two sets of weft yarn and a set of warp yarn interlaced double weave, the ground organization has plain weave, twill and so on.
The corduroy is woven from a set of warp yarns and two sets of weft yarns, wherein one set of weft yarns (called ground weft) is interwoven with the warp yarns to form a ground fabric with a fixed pile, and the other set of weft yarns (called weft yarns) are interwoven with warp yarns to form a regular float. Weft, after the cut, the formation of fluff.
The number is carefully followed by the usual method. Weft note that a set of weft yarns is cut and will be removed automatically when the yarn is removed. Before the number of wefts, it is necessary to judge the structure of the weft density from the edge of the cloth. The short yarn removed at the edge of the cloth is the cut yarn, which must be recorded in the fabric structure, and the long yarn is the ground yarn.
There are 3 pile yarns of 2 ground yarns. Only when the number of wefts is dense, we can only see the ground yarn structure. Don't forget to count the pile yarn.
4, double-layer fabric
There are 3 pile yarns of 2 ground yarns. Only when the number of wefts is dense, we can only see the ground yarn structure. Don't forget to count the pile yarn.
A fabric having a two-layer fabric structure can mark the minimum measurement distance in the upper layer, count the corresponding number of yarns, and count the number of yarns in the other layer at the same position on the reverse side. Add two layers together. Yarn removal method
5. Tight dark chemical fiber filament fabric For the convenience of observation, a test stand capable of illuminating the fabric from below is required.
First, the fabric is placed on the test bench, and in general, the measurement can be relatively clear.
If the yarn is fine and the tissue point is still unclear, it can be measured by observing the number of yarn cycles corresponding to the buckle, as shown in the right figure.
There are three yarns between each two rays, and several light conversions can be counted.
Density: The number of warp yarns and the number of weft yarns per unit length of the woven fabric under wrinkle-free and tension-free conditions.
Density: The number of warp yarns contained in the latitudinal unit length of the fabric.
Weft density: The number of weft yarns contained in the unit length along the warp direction of the fabric.
Test Methods
A Fabric Decomposition Method: Suitable for all woven fabrics, especially complex structures. As an arbitration method, the advantages: accuracy; disadvantages: slow
B Fabric analysis mirror method: suitable for fabrics with more than 50 yarns per cm, less used.
C Mobile fabric density mirror method: suitable for all fabrics. Common methods, fast and accurate.
Test procedure
1. Observe the structure of the fabric and the thickness of the yarn. Select the appropriate method. The laboratory mainly chooses Method A and Method C. The operation of Method B is simple and will not be explained in detail here.
A. Decomposition method 1 Remove the yarn at the edge of the sample, measure the length slightly larger than the specified size with a steel ruler, and cut it with scissors.
2 Use the needle to mark the specified size and remove it from the edge. For the convenience of counting, the yarns can be arranged in groups of 10 to obtain the number of warp or weft yarns within the specified length.
B. Mobile fabric density mirror table lamp, density mirror steel ruler: pressed on the light and thin fabric to ensure that the fabric is flat and the fabric does not slide when the density mirror moves. 1 Place the density mirror on the fabric surface, so that the marking line and scale under the magnifying glass The 0 point alignment on the ruler ensures that the scale on the density mirror is parallel to the other system yarn outside the system under test.
2 Turn the screw to count the number of yarns within the specified measuring distance.
Counting points:
Normally, the starting point is located between the two yarns, and the end point is located on the last yarn. Less than 0.25 is not counted, 0.25 to 0.75 are recorded as 0.5, and 0.75 or more is recorded as one.
2. The result is uniformly converted into root/10cm, if necessary, converted to inches: 1 inch = 2.54 cm, ie: 100.0 roots/10cm = 25.4 roots/inch. The scale of the density mirror needs to be perpendicular to the warp direction.
Second, the structure of the fabric with a cyclical structure determines the number of tissue cycles within the unit of measurement through the cyclical structure of the tissue structure; the number of yarns per tissue cycle is determined by tissue analysis or decomposition.
Fabric Density = Number of Tissue Cycles × Number of Yarns in Tissue Cycle + Number of Remaining Yarns
3 lower 1 upper 1 lower 1 upper, 6 yarns per cycle; 30 cycles zero and 3 in 5cm; then the number of yarns is 6*30+3=183 assumes 140 yarns per cycle, 4 The cycle requires 13 cm, and the number of yarns within 5 cm is: (140 ÷ (13 ÷ 4)) * 5 = 215.5.
More examples:
1. Color fabric with recycled pattern. The fabric can be used in two ways.
a, number pattern cycle: each pattern is composed of a hexagonal pattern, count how many yarns each pattern includes, and then count how many patterns in the minimum measurement distance, according to the previous formula
b. Personal recommendation method: the number of several color yarn cycles, as shown in the figure is that there are two blue yarns and six black yarns, and a total of eight is a group, as long as the number of color yarns in the minimum measurement distance is counted.
2, jacquard fabric jacquard fabric: warp and weft yarn intertwined and floating, forming a different, bumpy pattern.
At first glance, this fabric will definitely be intimidated by this complicated pattern. If the number of patterns is long, it may not be correct.
The patterned and unpatterned areas have the same number of warp and weft yarns. Therefore, the number density can be selected by a long distance of the basic organization. After the number is counted, it is converted into the number of yarns within 10cm.
3, corduroy fabric corduroy tissue uses two sets of weft yarn and a set of warp yarn interlaced double weave, the ground organization has plain weave, twill and so on.
The corduroy is woven from a set of warp yarns and two sets of weft yarns, wherein one set of weft yarns (called ground weft) is interwoven with the warp yarns to form a ground fabric with a fixed pile, and the other set of weft yarns (called weft yarns) are interwoven with warp yarns to form a regular float. Weft, after the cut, the formation of fluff.
The number is carefully followed by the usual method. Weft note that a set of weft yarns is cut and will be removed automatically when the yarn is removed. Before the number of wefts, it is necessary to judge the structure of the weft density from the edge of the cloth. The short yarn removed at the edge of the cloth is the cut yarn, which must be recorded in the fabric structure, and the long yarn is the ground yarn.
There are 3 pile yarns of 2 ground yarns. Only when the number of wefts is dense, we can only see the ground yarn structure. Don't forget to count the pile yarn.
4, double-layer fabric
There are 3 pile yarns of 2 ground yarns. Only when the number of wefts is dense, we can only see the ground yarn structure. Don't forget to count the pile yarn.
A fabric having a two-layer fabric structure can mark the minimum measurement distance in the upper layer, count the corresponding number of yarns, and count the number of yarns in the other layer at the same position on the reverse side. Add two layers together. Yarn removal method
5. Tight dark chemical fiber filament fabric For the convenience of observation, a test stand capable of illuminating the fabric from below is required.
First, the fabric is placed on the test bench, and in general, the measurement can be relatively clear.
If the yarn is fine and the tissue point is still unclear, it can be measured by observing the number of yarn cycles corresponding to the buckle, as shown in the right figure.
There are three yarns between each two rays, and several light conversions can be counted.
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