The first group standard of melt blown cloth for respirator in China is released, and the products are divided into 6 grades according to the filtration efficiency
On April 23, Jiangsu Textile Industry Association officially issued the group standard polypropylene melt blown nonwovens for masks (T / jsfzxh001-2020), which was officially implemented on April 26. This standard is the first group standard for the meltblown cloth for respirators issued in China. It is mainly applicable to the meltblown cloth for respirators for health protection. It is adopted by the group members in accordance with the agreement and voluntarily adopted by the society.
As the core material of mask production, the current demand is far greater than the supply. In recent years, the relevant enterprises have changed to produce melt blown cloth, but they do not know enough about the raw materials, equipment, production process, etc. the filter efficiency of the melt blown cloth is not high, and the quality cannot meet the needs of mask production.
At present, there are 2 industry standards related to melt blown fabric in China, namely, spunbond / melt blown / spunbond (SMS) nonwovens (FZ/T 64034-2014) and melt blown nonwovens (FZ/T 64078-2019). The former is applicable to SMS products with polypropylene as the main raw material and reinforced by hot-rolled bonding; the latter is applicable to nonwovens produced by melt blown process. The end use is not limited to masks. The standard only requires width and unit area quality, and the standard values of key indexes such as filtration efficiency and air permeability are stipulated in the supply and demand contract. At present, the production of melt blown cloth is mainly based on the enterprise standard, but the relevant index regulations are also uneven.
The group standard of polypropylene melt blown nonwovens for respirators issued this time stipulates the raw material requirements, product classification, basic technical requirements, special technical requirements, inspection and determination methods, and puts forward clear requirements for product identification around polypropylene melt blown nonwovens for respirators. The main technical indicators of the group standard include particle filtration efficiency, bacterial filtration efficiency, breaking strength, mass deviation rate per unit area and appearance quality requirements. The standard specifies the following contents: first, the product is graded according to the filtration efficiency level of the product, which is divided into six grades: kn 30, kn 60, kn 80, kn 90, kn 95 and kn 100. Second, the raw materials used shall be specified in accordance with the requirements of special melt blown plastic polypropylene (PP) (GB / T 30923-2014), which limits the use of toxic and harmful substances. Third, specific requirements are put forward for the particle filtration efficiency and bacterial filtration efficiency corresponding to different filtration efficiency levels, so as to meet the requirements of different types of masks for melt blown cloth.
Appendix: Group standard public information of T / jsfzxh 001-2020 polypropylene melt blown nonwovens for masks
Standard No.: T / jsfzxh 001-2020
Polypropylene melt blown nonwovens for masks
English title polyphylene melt blow nonwoven fabric for mask
International standard classification number ICs 59.080.30
China Standard Classification No. w 59
Issue date: April 23, 2020
Implementation date: April 26, 2020
Drafters: Jiangsu Fiber Inspection Bureau, Nanjing product quality supervision and Inspection Institute, Jiangsu Liyang New Material Co., Ltd., Jiangyin Jinfeng special textile Co., Ltd., Jiangsu Yimao filter material Co., Ltd., Zhangjiagang Junma non-woven fabric Co., Ltd., Jiangyin bairuijia non-woven fabric Co., Ltd., Suqian Meida Purification Technology Co., Ltd., beizisuo (Changzhou) science and Technology Development Co., Ltd Exhibition Co., Ltd., Jiangsu xinyi'an new technology material Co., Ltd., Jiangyin Jianfa special textile Co., Ltd., Changzhou Jinxinda fiber new material Co., Ltd., Changzhou lilletong New Material Technology Co., Ltd., Yimi (Wuxi) nano material technology Co., Ltd
Drafters: Xu Hongyan, you Li, Zhou Yan, you Xiangyin, Huang Xing, Zhang Yujie, sun Junhua, Xu Kai
This standard specifies the terms and definitions, product classification, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of polypropylene melt blown nonwovens for masks (hereinafter referred to as "mask melt blown fabrics").
This standard is applicable to nonwovens made of polypropylene by melt blown method and used for the production of masks for health protection.
Main technical content i. product classification
According to the filter efficiency level, the mask melt blown cloth is classified, see Table 1 for details.
Table 1 Classification of melt blown cloth for respirator
Classification kn30 kn60 kn80 Kn90 kn95 kn100
2、 Raw material requirements
The raw materials used shall comply with the relevant requirements of GB / T 30923 special melt blown plastic polypropylene (PP).
3、 Technical requirements
（1） Internal quality
1. Basic technical requirements
See Table 2 for basic technical requirements.
Table 2 basic technical requirements
Project specification (g / m2)： ≤20 ≤50 ≤100 ≤150
Width deviation / mm： - 1 - + 3
Mass deviation rate per unit area /% ：± 8 ± 7 ± 5 ± 4
Variation coefficient of mass per unit area： ≤ 7 ≤ 6
Breaking strength / N transverse： ≥ 2 ≥ 6 ≥ 10
Longitudinal： ≥ 4 ≥ 9 ≥ 15
Longitudinal elongation at break /%： ≥ 20
2. Special technical requirements
See Table 3 for the corresponding filtration efficiency indexes of different filtration efficiency levels.
Table 3 filtration efficiency
Filter efficiency level： kn30 kn60 kn80 Kn90 kn95 kn100
Particle filtration efficiency%： ≥ 30 ≥ 60 ≥ 80 ≥ 90 ≥ 95 ≥ 99.97
Bacterial filtration efficiency% ：≥ 95 \ \\
Air flow resistance： ≤ 80 PA.
The microorganism index shall conform to the relevant provisions of Table 1 of GB 15979-2002 for ordinary grade respirators.
Peculiar smell shall comply with relevant provisions of GB 18401.
（2） Appearance quality
See Table 4 for appearance quality requirements.
Table 4 appearance quality requirements
Hole breaking： not allowed
No obvious pinhole： ≤ 10 / 100cm2
Obviously： not allowed
Crystal Point area： ≤ 1mm2 ≤ 10 / 100cm2
Area ≥ 1mm2: not allowed
Flying flowers: not allowed
Foreign matte:r not allowed
Note 1: crystal point refers to the point polymer particles existing on the cloth surface.
Note 2: flying flower refers to the consolidated flying on cloth surface