How are disposable medical masks made? How to disinfect?
At least three layers
If you cut the mask, you can see that there are at least 3 layers of non-woven fabric, which is a production requirement, at least 3 layers.
What is non-woven fabric?
"Non-woven fabric" (also known as "non-woven") is named for the process of making them, This kind of cloth is not woven, The various kinds of clothing we often wear, cotton, linen, and silk, are always made by weaving a little bit of horizontal and vertical weft on a machine.,Like the typica,l look at a lace grid.
The orifice system allows the machine to weave the same pattern over and over again without making mistakes, and the beautiful lace pattern gradually takes shape.
And "non-woven fabric" is similar to the way we make felt needles, there is no weaving, is to use N needles in a row continuously to poke and pook, to let the cotton structure tangled coagulation together, and then processed into such a flat layer of cloth. This is not what expensive materials, grandparents to participate in what health activities for the elderly, the kind of "environmental bags", most of them are made with "non-woven fabric".
Then why so many days, will still face mask shortage? Because the market relationship is that demand exceeds supply... As disposable consumables, the nation's more than 1 billion people want a few every day, a sudden explosion of demand, coupled with the shortage of raw materials, manufacturing powers emergency return to work, working day and night ,a short supply...
Merge three layers.
Such three layers of non-woven fabric material are stacked together by the production machine as shown in the picture below.
Have you noticed this little horn in the upper left corner of the machine? There is a string running through the bell mouth.
This is the second structure of the mask: the flexible wire at the top of the mask. When wearing to knead the nose clip fixed to the bridge of the nose, so wear mask will be tight, otherwise without this structure, My flat nose is a bad case of air leakage the seal is not tight, affect the protective effect.
Take a close-up, which is to convey the delivery wire along the side of the non-woven fabric, and then the following structure with a roll of edges and a stitch at the back, and you're done
The main part of the mask is the layered structure shown in the picture below, which is pulled back to completely cover the mouth and nose.It doesn't matter when your face is big
This cascade structure section looks like this, which requires a machine folding link.
It is the mechanical design as shown in the picture below, with such three pieces adjustable bevel, set a small bevel, so that the large non-woven fabric along these bevels, from left to right gradually narrowed down to "fold structure".
Then there is a piece of pressure, press the surface of the mask to be flat.
Most of the individual cuts and seaming of the mask are fully automatic without manual treatment. And different mask is to have subtle manufacturing difference, some are seamed, some are directly pressed glue, small details.
Come out a separate mask body. And not done yet. There are several steps ahead.
Below is the mask I bought. Notice the edge of the mask, there is a piece of non-woven fabric to strengthen and press the ear rope so as not to tear it.
Left and right two large rolls of non-woven fabric, waiting to strengthen the edge of the mask.
After one side is wrapped, immediately flatten and bond.
This time out of the original cut mask was linked together again, this is really since ancient times amorous spare hate, the hate continuous no absolutely period.
So also need a cut to strengthen the edge of the link, a clean break.
Hot press mounting lugs
You also need to use adhesive on the edge of the mask, as shown in the picture below, this side of the mechanical claw to send hanging ear rope, there is the bottom of the hot press adhesive to fix the hanging ear rope on the mask, so that a flat face mask is finished
Of course, after that, we'll have to ask our "manual quality control". In the recent mask factory news, we often see the staff to pull the ear rope to test or clean the mask, some little cute worry about the asepsis problem, Take it easy.they have to send to the sterilization.
Before disinfecting, let's take a look at the production of an open mask, which is commonly seen in anti-smog masks or in higher protection specifications, such as those with breathing valves. The material shown in the picture below is very clear. The 5 rolls of non-woven fabric on the right show a structure with 5 layers.The orange wheel is filled with wire from the nose clip.
The most important structure of the open mask is shown in the picture below. A flat piece of fabric is folded together through the v-shaped structure, and then cut into a single one. Then the cutting edge stitching and the production of the strengthened ear-sealing thread are almost unnecessary.
Disinfection and sterilization
Speaking of non-woven fabric is it also heard the old people complain that this kind of bag is not strong, multi-purpose a few times easy to break? Fragile non-woven cloth is generally not use high temperature disinfection method, is the use of "ethylene oxide" this colorless gas to kill bacteria, mold and fungi.
I found an animated demo.Abatch of masks were sent to the disinfection room, and then passed with ethylene oxide gas (the yellow in the figure below is for highlighting, but actually colorless). The disinfection process was completed after reaching a certain concentration. After that, air and nitrogen are used in the disinfection room to dilute and remove ethylene oxide, so many times, until the residue of ethylene oxide on the mask is up to the standard.
Medical bandages, sutures, surgical instruments, and some goods that are resistant to high temperature sterilization can all be disinfected with ethylene oxide.
Individual seal and dozen seal
The mask that we buy generally have the sealed package of a single seal and a few couplet bag of a pile of plastic seal together, There is no good or bad between the two. depend on your usage amount and decide. It is in after disinfection just package, As long as they are made by a regular manufacturer,have clear production information, accord with use standard, they are compliance