Scope and standards of melt blown fabric testing
Melt blown cloth is a nuclear material used to filter out bacteria in a mask. The medical mask is divided into three layers, with a melt blown cloth as the middle layer. It has strong filtering, shielding, and thermal insulation properties, which can play a role in sterilization and virus isolation. Therefore, melt blown fabric testing plays a crucial role in controlling the quality of the hood. So, how to conduct melt blown fabric inspection?
The testing items include: particulate matter filtration efficiency (PFE), bacterial filtration efficiency (BFE), longitudinal fracture strength, transverse fracture strength, longitudinal fracture elongation, transverse fracture elongation, thermal resistance, permeability, unit volume deviation, appearance, width, and microphysical indicators.
1. Filtering efficiency
Filtering efficiency is a key indicator for evaluating the quality of masks. This is also one of the important quality standards for melt blown fabrics, so referring to relevant standards, the bacterial filtration efficiency of the mask melt blown fabric should not be less than 95%, and the filtration efficiency of oily particles with high particle filtration efficiency should not be less than 90%.
1. Resistance factor
When wearing a mask, it hinders breathing and affects the body. So the resistance of the melt blown cloth on the mask determines the comfort when wearing the mask. The recommended indicators are that the resistance should be ≤ 350Pa and the respiratory resistance should be ≤ 250Pa
Testing standards:
GB/T 32610-2016 (Technical Specification for Occupational Protective Masks).
GB 2626-2019 (Self suction filter type anti particle respirator).
GB19083-2010 (Technical Requirements for Protective Covers).
YY0469-2011 (Technical Requirements for Medical and Surgical Masks).
EN 149-2001+A1-2009 (EU Protective Masks Requirements).
EN14683:2019+AC: 2019 (EU Medical Mask Requirements).
