Four types of spunlace nonwovens - testing items and standard reference

In my country, spunlace non-woven fabrics are mainly used in medical and sanitary products, beauty industry, light industrial production, electronics industry, environmental protection and other fields, which play a positive role in promoting the development of traditional chemical fibers and differential fibers in my country.

Spunlace non-woven fabric is an important raw material for mask products, medical masks, medical protective clothing, medical dressing gauze, surgical gowns, and artificial leather base cloth. How to grasp the quality of spunlace nonwovens through testing is a concern of relevant manufacturers.

1. Testing of composite spunlace nonwovens

Composite spunlace nonwovens can be tested according to the regulations in GB/T 26379-2011 "Textiles - Wood pulp composite spunlace nonwovens". GB/T 26379-2011 divides composite spunlace nonwovens into ordinary and functional composite spunlace nonwovens.

Among them, functional composite spunlace non-woven fabrics are mainly used for special purposes such as water repellency and flame retardancy. The external quality inspection items of the two composite spunlace nonwovens are the same, but the internal quality inspection items are slightly different. The specific requirements are as follows:

(1) Intrinsic quality inspection items of ordinary composite spunlace non-woven fabrics: mass deviation rate per unit area, mass unevenness per unit area, transverse breaking strength, absorption capacity, color fastness to rubbing, and width deviation;

(2) Internal quality inspection items of functional composite spunlace non-woven fabrics: mass deviation rate per unit area, mass unevenness per unit area, transverse breaking strength, color fastness to rubbing, width deviation, water seepage resistance, water staining performance, anti-alcohol performance, flame retardant performance;

(3) External quality inspection items of composite spunlace non-woven fabrics: linear defects, poor trimming and edge cutting, bad curling, printing and dyeing defects, splicing times, stains, stains, impurities, damaged defects, delamination, insects trace etc.

2. Chitosan fiber spunlace non-woven fabric detection

Chitosan fiber spunlace nonwovens can be tested according to the regulations in FZ/T 64077.2-2019 "Chitosan fiber nonwovens Part 2: Spunlace nonwovens". The testing items of chitosan fiber spunlace nonwovens are basically similar to those of hygienic spunlace nonwovens, and are also divided into three items: internal quality, external quality, and microorganisms. Specific requirements are as follows:

(1) Internal quality inspection items: mass deviation rate per unit area, width deviation, longitudinal and transverse fracture strength, deviation rate of chitosan fiber content, pH value, formaldehyde content, migratable fluorescent substances, liquid absorption, antibacterial rate, heavy metal content (lead, mercury, arsenic);

(2) External quality inspection items: cloth surface, joint, slitting end surface;

(3) Microbial index testing items: total bacterial colony, coliform, total fungal colony, pathogenic pyogenic bacteria, etc.

3. Inspection of hygienic spunlace non-woven fabrics (including facial mask fabric)

Hygienic spunlace nonwovens can be tested according to the regulations in FZ/T 64012-2013 "Sanitary spunlace nonwovens". FZ/T 64012-2013 divides the inspection items of hygienic spunlaced nonwovens into three categories: internal quality inspection, external quality inspection, and microbial index inspection. The specific reference inspection items are as follows:

(1) Internal quality inspection items: mass deviation rate per unit area, mass variation coefficient per unit area, thickness deviation, breaking strength, width deviation, liquid absorption, pH value;

(2) External quality inspection items: fabric surface quality defects, color difference, blemishes, etc.;

(3) Microbial index testing items: total bacterial colony, coliform bacteria, Staphylococcus aureus, pathogenic pyogenic bacteria, etc.

4. Testing of insulating spunlace nonwovens

Insulation spunlace nonwovens can be tested according to the regulations in FZ/T 64065-2017 "Aramid spunlace nonwovens for insulation". Insulating spunlaced nonwovens only need to test two items of internal quality and external quality. Specific requirements are as follows:

1. Internal quality inspection items: mass deviation rate per unit area, thickness deviation, width deviation, limiting oxygen index, continued burning time, smoldering time, damage length, electrical strength, breaking strength, elongation at break, tearing strength, Relative permittivity, dielectric loss factor, thermal shrinkage;

2. External quality inspection items: the cloth surface is even and smooth, without obvious creases, broken edges, holes, oil stains, spots, etc., and the rolls should be neat.