Tarpaulin (also known as waterproof cloth) is a high-strength, resilient, and flexible waterproof material, often used as canvas (oil canvas), polyester with polyurethane coating, or made into polyethylene plastic. Tarpaulins usually have sturdy grommets at the corners or edges for easy rope tying, hanging, or covering.

Tarpaulin is usually divided into two categories: coarse tarpaulin and fine tarpaulin.

Coarse tarpaulin, also known as awning cloth, is a sturdy and folding resistant fabric with good waterproof performance. It is used for car transportation, covering outdoor warehouses, and setting up tents in the wild

Fine tarpaulin warp and weft yarn is used for making labor protection clothing and its accessories. After dyeing, it can also be used as 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, the yarn count refers to the thickness of the yarn. The commonly used system in China is still the "English system", which means one pound (454 grams) of cotton yarn (or other component yarn) with a length of

At 840 yards (0.9144 yards/meter), the fineness of the yarn is one strand. If a pound of yarn, its length is 10 × The size 840, with a fineness of 10 yarns, is represented by the English letter "S" in English. The representation of a single yarn is as follows:

32 single yarns - denoted as 32S strands - are represented as 32S/2 strands (two strands twisted in parallel) and 42S/3 strands twisted in parallel.

2. Density:

The unit of calculation for the density of tarpaulin fabric is the metric system, which refers to the number of warp and weft yarns arranged within 10cm. The size of density directly affects the physical and mechanical indicators of the fabric, such as appearance, feel, thickness, strength, bending resistance, breathability, wear resistance, and warmth retention. It also affects the cost and production efficiency of the product.

(1)

Indirect testing method

This method is suitable for fabrics with high density and small yarn count in regular weave. Firstly, by analyzing the fabric structure and its cyclic warp count

The density of warp (weft) yarn is obtained by multiplying the number of weave cycles in 10cm by the number of weave cycles.

(II)

Direct measurement method

The direct measurement method is achieved by using a fabric mirror or a fabric density analysis mirror. The scale length 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 fabric density, move the lens to align the red line on the glass and the red line on the scale between two yarns. Starting from this, move the lens while counting the number of yarns until the 5cm scale line reaches this point. The density value of 10cm fabric is obtained by multiplying the number of output yarns by 2.

When counting the number of yarns, the center between the two yarns should be used as the starting point. If more than 0.5 yarns are counted to the end point and less than one yarn is counted, it should be calculated as 0.75 yarns

If it is less than 0.5 pieces, it will be calculated as 0.25 pieces. Generally, 3-4 data should be measured for fabric density, and then the arithmetic mean value should be taken as the measurement result.

3. Weight:

Weight:

Refers to the weight in grams of one square meter of fabric.

The fabric of woven tarpaulin is usually weighed in grams (g/m2) using "ounces", "An", or "OZ" knitted tarpaulin. Its conversion is 1 ounce, which is 28.375 grams. However, on a weighing machine, it is generally

28.35 grams, depending on the yarn count and the warp and weft density of the fabric. The thicker the yarn, the thicker the fabric, and the heavier the weight.