Studies On The Preparation And Properties Of The PA6/PET Bicomponent Spunbond-spunlace Nonwoven Fabrics

PA6 and PET chips were used as the raw materials of PA6/PET spunbond-spunlace bicomponent nonwoven fabrics. During the preparation process, theorange-sectional bicomponent fibers were split into superfine fibers and hydro-entangled in the spunlace process. The product had high strength, great hydrostatic pressure resistance, easy-dyeing, soft feel and so on. It could find applications for health care, precision filtration and clothing, etc.First, the melting temperatures and peak widths of the two raw materials PA6 and PET chips for nonwoven fabrics were determined by differential scanning calorimetry, with PET in the range of 249-268℃ and PA 6 in the range of 215-232℃. The PA 6/PET bicomponent spunbond-spunlace nonwovens with the surface density of 50, 80, 100, 130, 150 grams per square meter were produced by pilot facilities. The fabrics’ structure and performances were characterized as follows: the fiber cross sections were observed by scanning electron microscope. It was found that the bicomponent spunbonded fibers were composed of 16 sectional microfibers, exhibited a hollow orange-structure. The bicomponent fiber was split well and the split microfibers were hydro-entangled firmly. The results of mechanical properties showed that the tensile strength, tear strength and burst strength were increased with the increase of surface density, while the filtration efficiency results gave similar behavior with surface density.Dyeing process and parameters generally consist of dyeing pre-treatment, dyeing temperature, dyeing carriers and dyeing additives. The alkali pretreatment was definitely beneficial to dyeing, and dyeing carriers improved dye uptake for the PET/PA6 bicomponent spunbond-spunlace microfiber nonwoven fabrics as well. The PET component fiber was dyed with disperse dye and PA6 component fiber with reactive dyes in the dyeing process. The optimal dyeing process parameters included: alkali pre-treatment 3min, the carrier content 6%, the initial and the final dyeing temperatures for dispersed dye were 50℃ and 85℃ respectively, while the initial and the final dyeing temperatures for reactive dye were 70℃ and 90℃ respectively. The resistances of the washing and the rubbing fastnesses of the resultant dyeing fabrics could meet the customer’s requirements.In addition, the performances of PA6/PET bicomponent spunbond-spunlace nonwoven and its wood pulp spunlace composite nonwoven fabrics were compared. The results showed that the mechanical properties, softening and absorption of the PA6/PET bicomponent spunbond-spunlace wipe were all better than those of the wood pulp spunlace composite wipe.