# Relationship between density and waterproofness of tarpaulin

Update:20-12-2019
Summary:

Density The density of the tarpaulin is calculated in t […]

Density The density of the tarpaulin is calculated in the metric system and refers to the number of warp and weft yarns arranged within 10 cm. The density of the fabric directly affects the physical and mechanical indicators such as the appearance, feel, thickness, strength, folding resistance, air permeability, abrasion resistance and thermal insulation of the fabric. At the same time, it is also related to the cost and production efficiency of the product. The indirect test method is suitable for fabrics with high density and small yarn fineness. The structure of the fabric and the number of warp yarns (number of weft yarns) were analyzed first, and then multiplied by the number of cycles within 10 cm, the product obtained was the density of warp (weft) yarns.

The direct counting method is done by cloth mirror or fabric density analysis mirror. The fabric density analyzer is 5 cm in length. Under the analysis lens, a long glass bar is engraved with a red line. When analyzing fabric density, move the lens. Align the red line on the glass piece and the red line on the scale at the same time between the two yarns. Using this as a starting point, move the yarn number on the side of the lens until the 5 cm scale is completed.

The number of yarns multiplied by 2 is the density value of a 10 cm fabric. When counting the number of yarns, the center between the two yarns is used as the starting point. If the number of yarns reaching the end point is greater than 0.5 and less than 1, it shall be calculated as 0.75. If it is less than 0.5, then 0 .25 calculations. In general, the fabric density should be measured from 3 to 4 data, and then the arithmetic average value is taken as the measurement result. 3. Gram weight: refers to the weight of one square meter of cloth. Woven tarpaulins are made of "oz", "An" or "OZ" knitted tarpaulins, which are generally converted to 28.375 grams per ounce, but on a fabric weighing machine, their weight is generally 28.35g, which is the same The yarn is related to the warp and weft density of the fabric. The thicker the yarn and the thicker the cloth, the greater the weight of grams.

The tarpaulin is a high-strength, waterproof material with good toughness and softness. It is often used as canvas, polyester with polyurethane coating or made of polyethylene plastic. Tarpaulins usually have strong grommetes at the corners or edges to make it easy to tie, hang or cover with a rope. In addition, there are rubber tarpaulins, fire-proof and radiation-proof shielding tarpaulins, and tarpaulins for paper machines. Rough tarpaulin, also known as tarpaulin, is fast and resistant to folding and has good water resistance. It is mainly used for covering and erection of automobile transportation, open storage, field tents.