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N95 Respirator: Melt-Blown, Charged and Welded
The filter of an N95 respirator is nonwoven polypropylene made by melt blowing: molten polymer is pushed through a spinneret and jets of hot air stretch it into very fine fibres that land on a moving belt as a web. The fibres carry an electric charge, an electret, which helps them catch particles; charges can be put on such materials by corona discharge. Typical filter layers weigh 10–100 g per square metre. The filter is layered between cover webs, cut and ultrasonically welded; an aluminium strip is sealed in at the top as a nose clip, and the straps are stapled on.
高级
Factory process
说明
1
1
Melt-blow the filter
Melt-blow the filter
Melt polypropylene, extrude it through a spinneret and stretch it into fine fibres with hot air onto a moving belt.
此步骤所需材料：
聚丙烯颗粒1 公斤所需工具：
熔喷生产线2
2
Charge
Charge
Give the filter web an electret charge.
所需工具：
电晕驻极装置3
3
Layer and weld
Layer and weld
Ply the filter between the cover webs in order, cut the stack and weld it ultrasonically.
此步骤所需材料：
无纺布覆盖层1 个所需工具：
超声波塑料焊接机4
4
Nose clip and straps
Nose clip and straps
Seal a soft aluminium strip in along the top as the nose clip, and staple on the straps.
此步骤所需材料：
铝鼻夹条1 个
弹力绳0.6 m
CC0 公共领域
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