"The Year of the Ox Limited New Year Mask" is printed and dyed on a large area, is the protective effect still "ox"?
The Spring Festival is approaching, the market atmosphere of the New Year goods is getting stronger, and various "fu" characters and spring couplets are on sale.
The demand for this customized version of the Spring Festival also extends to masks.
Recently, a class of "New Year masks" and "New Year's greeting masks" with the words "Fu", "Auspicious", "Niu Zhuanqian" and "Bullish" appeared on the market.
Some are also printed with patterns such as cows and lanterns, and some masks even have a red background.
The disposable medical masks or medical surgical masks we used in the past are generally solid colors.
Masks with larger areas of dyeing and printing
Will the protection effect be compromised?
Are there health risks?
Insiders: It is recommended to use unprinted and undyed masks
Medical-grade masks that can effectively protect against viruses are made of spunbonded nonwoven fabric and meltblown nonwoven fabric.
The commonly said three-layer medical mask, from the outside to the inside, is the outer moisture-resistant layer, which is a spunbond layer, referred to as the S layer; the middle filter adsorption layer, which is the melt blown layer, referred to as the M layer; the inner layer is the paste The skin layer is also a spunbond layer, referred to as the S layer.
This is the so-called SMS structure.
The SMS structure is the most basic requirement for medical masks. Some masks may also be SMMMS structures, and the core meltblown layer can have multiple layers.
Meltblown cloth has filterability, barrier properties, heat preservation and adsorption properties, and is known as the "heart" of masks.
The exclusive raw material of meltblown cloth is polypropylene with high melt index.
Its principle of action is that the meltblown cloth fiber is very thin, about 1/30th of the hair, and it has an electrostatic adsorption effect, so tiny particles such as dust and droplets are easily intercepted by the meltblown cloth.
According to reports, printing is not on the melt-blown cloth layer. If it does not affect the melt-blown layer, printing has little effect on the protective effect of the mask. The effect of printing depends on the process.
As far as the domestic process is concerned, it is unlikely to affect the middle melt blown cloth.
Unless a large amount of oily residue remains during printing and dyeing, that is, too much ink, oily particles will eliminate static electricity.
However, printing masks also need to investigate whether there are excessive microorganisms, whether the dyed aromatic amines exceed the standard, whether there is an obvious pungent odor, and whether the cytotoxicity index exceeds the standard.
Therefore, it is not recommended that people wear this kind of printed mask.
Look for identification standards
Now the common masks on the market can be divided into two categories: medical masks and non-medical masks.
Medical masks include: medical protective masks, medical surgical masks, and disposable medical masks.
As for the type of mask, what kind of protective effect it has achieved, and what scene it is suitable for wearing, these cannot be judged by the appearance of the mask. You should carefully read the packaging label when purchasing.
The selection and identification of medical masks depends first on the implementation standards.
The executive standard for medical protective masks is GB19083-2010; the executive standard for medical surgical masks is YY0469-2011; the executive standard for disposable medical masks is YY/T0969-2013.
Some products claim to implement the enterprise standard (YZB) formulated by the enterprise itself. In principle, the technical requirements of the enterprise standard are not lower than the national standard (GB) or industry standard (YY).
Second, it depends on the registration certificate number.
The product registration number should be marked on the outer packaging of medical masks subject to medical device licensing supervision.
When buying, if you are not shopping online, you can still smell the product.
Normal masks should be odorless and tasteless. Try not to buy masks with irritating or unpleasant odors. At the same time, you must be cautious when buying masks that are too strong.
Sterilized masks have 7-14 days of analysis time after the ethylene oxide sterilization process.
In the implementation standards of disposable medical masks and medical surgical masks, it is required that the residual amount of ethylene oxide should not exceed 10μg/g.