Classification of tarpaulin.

Tarpaulin is usually divided into coarse tarpaulin and thin tarpaulin two categories.Rough tarpaulin, also known as canopy cloth, fabric fast folding, with good waterproof performance, used for car transport and open-air warehouse cover and field tents

Thin tarpaulin warp and weft yarn for the production, labor protection clothing and supplies. After dyeing, it can also be used as shoes, travel bags, backpacks and other fabrics. In addition, there are rubber tarpaulin, fire, radiation shielding tarpaulin, paper machine with tarpaulin.

1. Yarn count:

In short, that is, the thickness of the yarn, China's common or "British style" that is: a pound (454 grams) weight of cotton yarn (or other components of yarn), length of 840 yards (0.9144 yards/m), the fineness of the yarn is a. For a pound of yarn, its length is 10×840 yards and its fineness is 10 yarn strands, the symbol for the British system is the letter "S". The representation of a single yarn is as follows: 32 single yarn ------- is as follows: 32 strands of yarn (two and twisted) are as follows: 32S/2. 42 strands of yarn and twisted are as follows: 42S/3.

2. Density:

The calculation unit of tarpaulin fabric density is measured in metric system, which refers to the number of roots arranged by the weft yarn in 10cm. The size of the density directly affects the appearance of the fabric, feel, thickness, strength, folding resistance, permeability, wear resistance and thermal insulation properties and other physical and mechanical indicators, while he is also related to the cost of the product and the size of production efficiency.

(I) Indirect test method

This method is suitable for regular fabric with high density and small yarn characteristic number. Firstly, the fabric structure and the number of cyclic warp are analyzed

(tissue cycle weft number), then multiplied by the number of tissue cycles in 10cm, the resulting product is the warp (weft) yarn density.

(2) Direct measurement method

The direct measurement method is done by using 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 glass sheet is engraved with a red line. When analyzing the fabric density, move the lens, align the red line on the glass sheet and the red line on the scale at the same time between two yarns, and take this as the starting point. The output yarn number multiplied by 2 is the density value of 10cm fabric.

When counting the number of yarn, it is necessary to take the center between the two yarns as the starting point, if the count to the end, more than 0.5, and less than one, it should be calculated according to 0.75

If it is less than 0.5, it is calculated as 0.25. Fabric density should generally be measured 3-4 data, and then take its arithmetic average as the measurement result.