What are the performance indicators of spunmelt nonwovens

1 uniformity

The uniformity is expressed by the discrete coefficient "CV value" of the quantitative value, which reflects the uneven distribution (thickness and thinness) of the product web. The larger the CV value, the worse the quality of the product. Generally, the larger the quantitative value of the product, the smaller the CV value. The unit of the CV value is "%". Quantitative is defined as the weight (quality) of a product per unit area. The legal unit of measurement in my country is gram/m2 or g/m2.

2 strong

 Strength means the maximum force required to break the product when the product undergoes a strength (tensile) test, and the unit is N ("Newton"-"Newton" for short). The greater the power, the better the quality of the product. The strength is not only related to the quantitative size of the product (the greater the quantitative, the greater the strength), but also the direction of the product's force. The direction of the product is generally divided into the running direction of the production line (referred to as MD) and the transverse direction (the direction perpendicular to the running direction of the production line, referred to as CD). With the different laying methods used in the production line, general products have anisotropy. For example, products with longitudinally laid nets will have greater strength in the MD direction, and the MD strength of some production lines can be twice or more than that of CD. The same product has different strengths in different directions. In practical applications, it is hoped that the vertical and horizontal strengths are close to make the product behave isotropically.

3 Elongation at break

The elongation at break refers to the ratio of the elongation part of the product to the original length of the sample when the product is subjected to a tensile test. The unit of elongation at break is "%". When the product quality is good and the fiber is fully drawn, the elongation at break is less than 100%; the elongation at break of the meltblown cloth is small