Cotton fibres have been used in many absorbent products. A porous structure is most conducive to absorbing liquid. More is the porosity better would be the absorbent capacity. However, a porous fibrous structure is structurally fragile and can easily collapse during the absorbing process leading to changes in porosity, nature of pore structure and pore size distribution. The structural rigidity is influenced by fibre fineness and degree of mechanical bonding between the fibres. The absorbency characteristics and structural collapsing possibility of nonwoven fabrics made from very coarse and fine cotton fibres have been investigated using synthetic urine. It has been shown that the absorption capacity rises phenomenally, once the porosity crosses the value of 0.97. All nonwoven have been found to collapse laterally during absorption process, leading to lowering of absorption capacity especially in nonwovens consisting of fine fibres (3 micronaire). Nonwovens made from coarser fibres (6 micronaire) showed both higher absorption capacity and rate in comparison to those made from finer fibres (3 micronaire).

棉纤维已用于许多吸收性产品中。多孔结构最有利于吸收液体。孔隙率越大，吸收能力越好。然而，多孔纤维结构在结构上是脆弱的，并且在吸收过程中容易塌陷，从而导致孔隙率，孔结构的性质和孔径分布的变化。结构刚度受纤维细度和纤维之间机械粘合程度的影响。已经使用合成尿液研究了由非常粗和细的棉纤维制成的非织造织物的吸收特性和结构塌陷的可能性。已经表明，一旦孔隙率超过0.97，吸收能力就会显着提高。已发现所有非织造布在吸收过程中都会横向塌陷，导致吸收能力降低，特别是在由细纤维（3马克隆值）组成的无纺布中。与由较细纤维（3微米）制成的非织造布相比，具有更高的吸收能力和吸收率的非织造布。