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Meltblown die head and spinneret Meltblown nonwoven fabrics are the "heart" of medical surgical masks and N95 masks. Medical surgical masks and N95 masks generally adopt a multi-layer structure, referred to as the SMS structure: a single layer of spunbond layer (S) on both sides, and a melt-blown layer (M) in the middle. The middle meltblown layer is an electret-treated meltblown nonwoven fabric, which has good filterability, shielding properties, heat insulation and oil absorption, and is the core raw material for the production of masks. S layer: polypropylene special resin M Layer: polypropylene resin with high melt index An ordinary plane mask needs about 1g meltblown cloth + 2g spunbond cloth; and an N95 mask needs about 3 ~ 4g meltblown cloth + 4g spunbond cloth. Cut a used medical mask, you will find that the mask has three layers, (inner layer) moisture absorption layer, (middle layer) core filter layer, and (outer layer) water blocking lay...
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Questions in the modification production of PP melt-blown granule

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Questions in the modification production of PP melt-blown granule The mechanism of melt blown PP throughout the production process is that polypropylene undergoes free radical degradation under the action of initiator, high temperature melting and screw shear, its molecular chain is broken, the molecular weight is from large to small, and the melt finger is from low It becomes higher, the fluidity has been greatly improved, and finally we get the raw material of our melt-blown non-woven fabric. What problems should be paid attention to in the production process of PP melt-blown material modification process. 1: Accurate metering and feeding is the key to the stability of raw material batches 1..1 Precision requirements for a pair of measuring equipment 1.2 The selection of replenishing material level is appropriate to avoid the impact of feeding fluctuation during replenishing. 1.3 A liquid feed needs to achieve continuous and stable output in a short time. Without ...
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