Corona Virus Disease 2019( COVID-19), spread so fast around the whole world. Though governments has used very strict methods to stop it, still has little effort to stop such a terrible virus! The inflect people quantity has increased suddenly more than 1.6 million, so fast and uncontrolled, and the exist medicine is not easy to cure the patients, some lucky and strong persons can be cured by themselves.
Some famous VIP like Trump said the Face Masks can do nothing to protect persons during such a bad virus environment, but i want to say it is really really very useful! No matter you trust me or not, the facts is hospital has very few persons who has bad cold or has a fever, not the COVID-19, just normal fever, much less than last years!
Behaviour of Face masks
No matter what kind of masks, they really help a lot. They can reduce the bacterium and virus that we breathe in and speaking or eating. Why people will be ill or sick, not because you breathe only one piece of bacterium or virus, it depends on how much you breathe them in or eat them into your body. Human body is a very huge and complex system also a very beautiful and perfect system, it will be cured by itself when it is attacked by the virus. But everything has its limit, when thousands and even millions of virus come into our body, breakthrough our defense system, then we will be sick. And face masks can prevent most of the virus and bacterium in the air or environment, why some persons still said it is useless???
Type of Face Masks
Some face masks are disposable, some are not. In such a bad environment, i suggest to use disposable face masks, because the bacterium and virus will stay and live on face masks after using, no matter how you wash it and take care of it, but it’s ok to reuse it if you can sterile it before using.
Disposable Face Masks contain, 2 ply face mask, 3ply face mask, c-fold face mask, N95 face mask, KN95 face mask, BFE99 face mask, medical face mask and so many kinds.
2 ply face masks are not used a lot to prevent virus because it don’t have melt-brown non woven in it, so it can’t protect you, it mainly used to protect foods, so it is used in factory and markets to guard workers’ saliva.
3 ply face masks is also called BFE 95 face mask, plain face masks and medical surgical face masks, because it is cheapest and easily to make, it is most widely used in whole world.
- fold face masks is also called N95 abroad China, in China we called it KN95, touch face better and defend better.
BFE 99 face mask and medical face mask and surgical face mask are all need to use BFE 99 Melt-brown non woven fabric, and surgical face masks need to be sterile.
How face masks produced
The mask is composed of mask body and tensioning belt, of which the mask body is divided into three layers: inner, middle and outer, generally SMS structure. The “S” represents the spunbond layer, whose fiber diameter is relatively coarse, around 20 microns (μ m), and the 2 layers of S spunbond layer mainly serve to support the whole nonwoven structure, and do not play a big role in the barrier. The inner layer is an ordinary nonwoven fabric, mainly used to absorb moisture and water released by the wearer; the outer layer is a waterproof nonwoven fabric, mainly used to isolate the liquid sprayed by the patient; the most important thing inside the mask is the barrier layer or meltblown layer M (Meltblown), the fiber diameter of the meltblown layer is relatively fine, at about 2 microns (μ m), so only one tenth of the diameter of the spunbond layer, which is treated with electrophoresis Polypropylene meltblown nonwovens play a vital role in preventing the penetration of bacteria and blood.
The origin of meltblown nonwoven fabrics: Oil is cracked by distillation to obtain propylene, which is polymerized to form polypropylene (PP) particles. The polypropylene granules are melted and shaped to obtain polypropylene fibers. The working principle of meltblown nonwovens is to draw the polymer melt stream extruded from the spout hole of the die with high speed hot air, thus forming ultra-fine fibers and coalescing them on the receiving device to become a nonwoven fabric by its own bonding. The meltblown nonwoven is treated with a standing grade to increase electrostatic adsorption, achieving 95% filtration without changing breathing resistance and effective protection against viruses.
The production process of masks
After preparing the raw materials and equipment, the meltblown fabric and non-woven fabric which are divided into small rolls are put on the production line first. Firstly, 3 layers of non-woven fabric raw materials need to be laminated together and made into the main body of the mask through high frequency welding.The masks are all laminated structure, so that they can completely cover the mouth and nose after pulling them apart, but a machine is needed to fold the masks. The machine sets a small bevel angle in advance through 3 adjustable bevels, and the non-woven fabric finished by welding is gradually narrowed by the bevels to gather the folded structure. The folded structure is then compacted.With this process, the non-woven fabric is matched on one side to convey the metal wire, which is then stitched through the rolled edge, and the ear cords are threaded on the edge of the mask, which is then compacted. The individual cutting and sewing of the edges of the masks is mostly a fully automatic and manual process. There are subtle manufacturing differences from one mask to another, from stitched edges to direct heat pressed gluing. What comes out is a separate mask body. There is also a need to use adhesive on the edge of the mask, and the mechanical claw on this side sends the lanyard, and the lanyard is fixed on the mask by hot pressing the adhesive at the bottom there.During the production process, there are two large rolls of non-woven fabric on the left and right of the machine, which are used to reinforce the edge of the mask. After one side is wrapped, it is immediately flattened and glued. At this time, the masks that had been cut off are joined together again, and finally a machine cuts off the reinforcement side. In this way, a flat mask is produced.
The production of sterile masks also requires the use of ethylene oxide.Ethylene oxide is a broad-spectrum sterilizer that can kill various microorganisms at room temperature. Ethylene oxide is flammable and explosive and toxic to human body, so it needs to be left for 7 days for analysis after killing, and the residual amount is lower than the required value before it can be packaged and delivered to the factory for use by medical personnel.
The KN95 mask consists of a total of five layers, the outermost of which is a non-woven fabric with a water-resistant treatment. The second layer is hot air cotton. The third and fourth layers are two layers of electret treated meltblown fabric. KN95 uses 40 gsm or even higher gsm meltblown fabric.The innermost layer is a soft, skin-friendly non-woven fabric. Compared with other masks used in life to play a basic protective role, KN95 masks can give better protection.
The machines required for KN95 masks are sheeting machine, welding ear rope machine and sealing machine.
Mask Punching. Various rolls of fabric are installed on the transfer frame and passed through the main machine of the sheeting machine by traction, and then the fabric is welded together by ultrasonic welding when passing through the main machine, and then cut into the basic shape of the mask by cutting. Cutting is generally divided into cold cutting and hot cutting, and different cutting methods correspond to the use of certain differences in the tool. Mask welding ear cord. The cut mask body is welded to the mask body by the ear cord welding machine. The welding principle is to produce high temperature through ultrasonic waves and weld the ear cord and mask body together. There is a standard for the length of the ear cord. Too long to wear too loose, the mask is easy to fall off, can not play a protective role. Too short and will strangle the face and ear pain. Mask edge sealing. After the mask piece with welded ear cords is folded in half, the side edges are welded together by a sealing machine. The principle of welding is also to produce high temperature through ultrasonic waves to weld the side edges together. Mask packaging. After the sealing is completed, a complete KN95 mask is produced, and the mask can be packaged accordingly according to different needs.
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