Key secret of N95 melt blown cloth, precision melt blown mold helps you succeed
Labor is the most glorious
To produce a mask, it must have a name! To say contribution, it must be praised!
It's the precision melt and spray equipment.
As we all know, the melt blown cloth, equivalent to the "heart" of the mask, is the filter layer in the middle of the mask, which can filter bacteria and prevent the spread of bacteria. Melt blown cloth is a kind of film made of polypropylene with high melt index and many interlaced fibers in random direction. The diameter of the fiber ranges from 0.5 to 10 microns, and the diameter of the fiber is about one thirtieth of that of the hair.
Photos of melt blown fabric structure
How do you filter the virus in the environment when the gap is so big? Although the novel coronavirus is small in size and is about 100 nm (0.1 micron), it can not exist independently. The main routes of transmission are exudates and droplets when sneezing. The size of droplets is around 5 microns, which is one of them. Second, the melt blown cloth is essentially a kind of fiber filter. When the droplets containing virus are close to the melt blown cloth, they will also be adsorbed on the surface by static electricity and cannot be penetrated.
In the production process of mask and melt blown non-woven fabric, one of the most indispensable core components is the melt blown die head. In the melt blown equipment, the melt blown die head is one of the core components to realize the drawing and forming of polymers. The design and precision directly affect the length, uniformity, toughness, fineness and many other aspects of the drawing, thus having a decisive impact on the final coil quality.
The core component of the main machine of the melt blown production equipment is the spinneret head (spinneret). There are many spinneret holes on the die for the melt to pass through. Its production and processing are very important, which affect the production efficiency and quality of the melt blown cloth, and then affect the protective performance of the mask.
Principle of melt blown fiber forming
At present, China has realized the localization of melt blown cloth production equipment, but the production of core parts such as spinneret still relies on the supply of foreign manufacturers. In the emergency period, it is very important to provide the spinneret plate which can meet the needs of the production of medical surgical masks and kn95, kn99 and other high protective masks.
Spinneret
The principle of micro hole machining of melt blown cloth spinneretThe machine tool uses the principle of EDM to process high precision and high finish precise micro holes. It is used to process precision micro holes of all kinds of nozzle parts. The range of precision round micro holes is generally ￠ 0.1-0.5mm. The machine tool adopts circular filament electrode. With fine filament electrode feed mechanism, the servo feed and loss compensation of the electrode are realized. Deionized water working fluid is generally used for processing. The machine tool is composed of main engine, electric control box and working fluid system. The electric control box is composed of industrial computer, special high frequency pulse power supply for EDM micro finishing, detection servo control unit and machine electrical components.
The special machine tool for the spinneret of the piercing machine adopts the circular fine filament electrode.
With fine filament electrode feed mechanism, the servo feed and loss compensation of the electrode are realized. Deionized water working fluid is generally used for processing.
2、 The structure of melt blown cloth spinneret
According to the shape of spinneret, the structure of spinneret can be divided into three forms: circular, fan-shaped and rectangular. At present, circular plate and rectangular plate are widely used at home and abroad. In order to adapt to different kinds of chemical fiber spinning occasions, circular spinneret can be divided into plate type, flange plate type, plate ring type, flange ring type, etc.; rectangular spinneret can be divided into flange rectangle and flange groove rectangle, etc., which are mostly used for short fiber spinning with more holes.
Melt blown cloth is a kind of nonwovens formed by melt blown method, mainly with polypropylene as the main raw material. The actual production process of melt blown cloth is relatively complex, and the requirements for production equipment are also high. Its production mainly goes through six processes, including "melt preparation filtration metering melt extrusion from spinneret hole melt fine flow drafting and cooling forming net". The core component of the main machine of the melt blown production equipment is the spinneret (spinneret). There are many spinneret holes for melt to pass through on the die. Its production and processing are very important, which is related to the production efficiency and quality of the melt blown cloth.
At present, China has realized the localization of melt blown cloth production equipment, but the production of core parts such as spinneret still relies on the supply of foreign manufacturers. In the special period, it is very important to provide the spinneret which can meet the needs of the production of high protective mask.
The work piece is the core part of the die of the melt blown cloth extruder. Each work piece has more than 300 ~ 2000 micro holes according to the size of the die. According to the application level of the melt blown cloth, the micropore diameter is also different (Φ 0.2mm micropore mold is applied to N95 mask).
But! With the finest spinneret, you can have your N95 mask!
The core of the core, Plastex make more at ease!
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