Classification of tarpaulins

Tarpaulins are usually divided into two categories: coarse tarpaulins and fine tarpaulins.
Coarse tarpaulin, also known as tarpaulin, the fabric is strong and fold-resistant, has good waterproof performance, and is used for car transportation and open-air warehouse covering, as well as field tents
Fine tarpaulin warp and weft yarns are used in the making, labor protection of clothing and their supplies. After dyeing, it can also be used as a fabric for shoes, travel bags, backpacks, etc. In addition, there are rubber tarpaulins, shielding tarpaulins for fire and radiation protection, and tarpaulins for paper machines.

1. Yarn count:
In short, yarn count refers to the thickness of the yarn, and the common Chinese or "imperial standard" is: one pound (454 grams) of cotton yarn (or other component yarn) with a length of At 840 yards (0.9144 yards/m), the fineness of the yarn is one piece. If a pound of yarn, its length is 10×840 yards, its fineness is 10 counts, the representation of the yarn count is the English letter "S" The representation of a single yarn is:
32 single yarn ------- expressed as: 32S strands are expressed as: 32 strands (two twisted) are: 32S/2, 42 strands 3 twisted is: 42S/3.

2. Density:
The unit of calculation of tarpaulin fabric density is metric and refers to the number of warp and weft yarns arranged within 10cm. The size of the density directly affects the physical and mechanical indicators such as the appearance, feel, thickness, strength, flexural resistance, air permeability, wear resistance and warmth performance of the fabric, and it is also related to the cost of the product and the size of production efficiency.
(i) Indirect test method
This method is suitable for regularly organized fabrics with high density and small yarn characteristics. First, the fabric structure and its tissue cycle warp number are analyzed
(the number of tissue cycles of weft), then multiplied by the number of tissue cycles in 10cm, the resulting product is the warp (weft) density.
(ii) Direct measurement method
Direct measurement is done by means of a cloth mirror or a fabric density analysis mirror. The length of the scale of the fabric density analysis mirror is 5cm, under the analysis lens, a long strip of glass is engraved with a red line, when analyzing the density of the fabric, move the lens, the red line on the glass sheet and the red line on the scale are aligned between two yarns at the same time, and take this as a starting point, count the number of yarn roots while moving the lens until the 5cm scale line is this. The number of yarn roots output multiplied by 2 is the density value of a 10cm fabric.
When counting the number of yarns, the center between the two yarns should be used as the starting point, and if the number reaches the end, it should be calculated as 0.5, and when it is less than one, it should be counted as 0.75
If it is less than 0.5, it is counted as 0.25. Fabric density should generally be measured with 3-4 data, and then its arithmetic mean should be taken as the measurement result.

3. Weight:
Grammage:
Refers to the weight of grams of one square meter of cloth.
Woven tarpaulin fabric with "ounce", "An" or "OZ" knitted tarpaulin generally with grammage (g/m2) Its conversion is 1 ounce, equal to 28.375 grams, but on the weighing machine is generally 28.35 grams, related to the warp and weft density of the yarn count and fabric, the coarser the yarn, the greater the density, the thicker the cloth, and the greater the gram weight.