Mask non-woven fabrics should be tested in this way
Mask non-woven fabric is an important material for making masks. Relevant reports show that due to the impact of the Wuhan Coronavirus disease (COVID-19) pandemic, more than 3,000 companies have crossed borders to produce masks. Many companies are making efforts to produce masks. Although it can alleviate the tense situation of mask supply and demand, the uneven occupational status quo also brings challenges to mask testing. Although China has many specifications for the testing of finished masks. However, there are no relevant clear specifications for mask non-woven fabrics to query, which brings some confusion to mask material buyers or manufacturers. Today, Xinyu Non-woven analyzes the key objectives of mask non-woven fabrics for your reference and testing.
First of all, we should know that the scientific name of non-woven fabrics is non-woven fabrics, so the specifications of non-woven fabrics are mostly named after non-woven fabrics. The non-woven fabrics used for the production of masks are mostly polypropylene spunbond non-woven fabrics, polyester non-woven fabrics, etc. Here we refer to the Textile Standard FZ/T 64033-2014 'Spunbond Hot Rolled Nonwovens'.
According to the regulations in FZ/T 64033-2014, the internal quality inspection items of mask non-woven fabrics mainly include width error, mass error rate per unit area, coefficient of variation of mass per unit area, cracking strength, cracking elongation Rate. Appearance quality inspection items mainly include color difference, edge trimming defect rate, joints, frit, foreign matter, auxiliary net defect rate, soft folds, etc.
Of course, since there is no clear specification, Byrne engineers sum up the previous experience in mask testing and non-woven testing, and propose several important testing targets, namely filtration power, breathing resistance, hygiene targets, toxicology Experiment with these four items.
1. Filtration power
As we all know, filtration power is the key goal of mask quality assessment. This is also one of the important quality standards for non-woven fabrics, so referring to the relevant standards, we recommend that the bacterial filtration power of non-woven masks should be no less than 95%, and the particle filtration power should be no less than 30% for non-oily particles.
Second, breathing resistance
Respiratory resistance refers to the size of the influence of people wearing masks that hinder their breathing. Therefore, the breathing resistance of the non-woven fabric of the mask determines the breathing comfort when wearing the mask. Here we recommend that the inhalation resistance should be ≤350Pa, and the expiratory resistance should be ≤250Pa.
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