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The specific production process of medical masks (1)

Release time: 2021-01-08

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The specific production process of medical masks (1)

This is a common medical mask, mainly composed of three layers of non-woven fabric. The inner layer is an ordinary non-woven fabric; the outer layer is a waterproof non-woven fabric, which is mainly used to isolate the liquid sprayed by the patient; the middle filter layer is an electret-treated polypropylene melt-blown non-woven fabric; After the final production is completed, it must be sterilized by ethylene oxide and stand for 7 days to volatilize toxicity, and then be sealed and packaged and shipped away.

the medical mask

The core material of medical masks is polypropylene meltblown non-woven fabric after electret treatment. Please remember these two keywords, because they are the key to filtering new coronavirus aerosols.

1. Raw material: polypropylene particles

As long as you know, apart from overhauls, the refining and chemical plants of Sinopec, CNPC, and CNOOC will never shut down during the Chinese New Year, so as to ensure the continuous production of our gasoline and diesel, chemical raw materials (polyethylene, polypropylene), etc. The supply will be cut off, which is also the responsibility of the central enterprises. The polypropylene particles produced from chemical plants grow like this. Most of the plastic water bottles and tableware we buy are made of polypropylene.

polypropylene particles

How much is polypropylene? The current futures price is 7,000 yuan/ton. A large truck can pull about 30 tons, so the cost of picking up a truck of polypropylene through logistics is about 200,000 yuan.

2. Polypropylene fiber production

Just as textiles require plant fibers, the production of non-woven fabrics also requires fiber materials. Polypropylene particles are used to melt and shape, and high-melt refers to polypropylene fiber material, which is the core raw material for the production of masks, which is the strips of polypropylene fiber as shown in the figure below.

In 2019, the domestic output of polypropylene fiber was about 1.7 million tons, of which about 950,000 tons of high-melting polypropylene fiber can be used for masks. The production units include Sinopec’s Zhenhai Refinery, Shanghai Secco, Jingmen Petrochemical, Hainan Refinery, Maoming Petrochemical, Shijiazhuang Refinery, Guangzhou Petrochemical, etc.

Polypropylene fiber

In response to the epidemic this time, some of Sinopec's refineries have begun to adjust their production plans, and will continue to increase the production of high-melting index polyethylene fiber materials in February. Dushanzi Petrochemical is also on standby at any time to wait for adjustments. Therefore, this part of the material is mainly due to insufficient inventory. After the production capacity is up, the raw material supply of PP fiber is absolutely sufficient, as long as the road continues.

Manufacturers of non-woven fabrics need to purchase polypropylene fibers as raw materials from distributors or chemical plants, so the logistics path cannot be broken. If the city of non-woven fabric manufacturers is closed, it means that the supply of raw materials has been cut off, so how to produce?

How much is polypropylene fiber? The retail price found on Alibaba is 10,000 yuan/ton, which is not bad. There are major central enterprises, polypropylene fiber will not be out of stock, and the price will not soar. You can rest assured.