According to FZ / t64033-2014, the internal quality inspection items of mask non-woven fabric mainly include width deviation, mass deviation per unit area, mass variation coefficient per unit area, breaking strength and elongation at break. Appearance quality inspection items mainly include color difference, trimming defect rate, joint, frit, foreign matter, auxiliary network defect rate, soft folding, etc.
As we all know, filtration efficiency is the key index of mask quality evaluation. This is also one of the important quality standards of non-woven fabrics. Therefore, referring to relevant standards, it is recommended that the bacterial filtration efficiency of mask non-woven fabric should not be less than 95%, and the particle filtration efficiency should not be less than 30% of non oily particles.
When people wear masks, respiratory resistance will affect and hinder breathing. Therefore, the respiratory resistance of mask non-woven fabric determines the respiratory comfort when wearing mask. The recommended index is that the inspiratory resistance should be ≤ 350pa, expiratory resistance should be ≤ 250Pa。
Non woven fabric raw material testing mask.
Health indicators are naturally another important key indicator of mask non-woven fabrics. The recommended test items mainly include initial contaminated bacteria, bacterial colonies, coliforms, pathogenic pyogenic bacteria, fungal colonies, Escherichia coli, Staphylococcus aureus, Candida albicans, ethylene oxide residues, etc.
Skin irritation test mainly considers the protection test of some people with material allergy. Refer to gb15979. The skin irritation test of mask non-woven fabric is mainly to cut the samples in the appropriate area, soak them in normal saline, and then cover them with spot stickers.