How to evaluate the advantages and disadvantages of non-woven fabrics

I have been invited to be a judge of the package competition several times. During the written test, I always like to ask 'How long is the validity period of sterile materials packaged in non-woven fabrics?' Teachers can generally answer that the WS 310.2-2009 stipulation is half a year. There are not many 'yi' characters. We know that WS 310 uses very rigorous terminology, with three levels of 'should-2009).


Here we talked about GB/T 19633. The name of this specification is 'Packaging of Terminally Sterilized Medical DevicesSome teachers will ask, what do the letters in front of these standards mean? ISO is an international standard, GB is the pinyin initials of the word 'national standardAnother teacher asked what the T in GB/T means, which is the first letter of the pinyin of the word 'push' in 'recommendation'.


Many teachers use the indicator 'weight' when judging the quality of non-woven fabrics. I think the larger the weight per square meter, the thicker the non-woven fabric, the better the antibacterial effect. We talked about so many specifications just now. Are there any regulations on the 'gram weight' of medical non-woven packaging materials? Is there a minimum? To be precise, the concept of 'minimum grammage' does not exist (I will explain it later), only section 4.2.1.2 of DIN EN ISO536 stipulates that the grammage fluctuation of each batch of non-woven fabrics shall not exceed 5% of the declared value. . That is to say, the grammage of 50g is declared, and the actual grammage of the non-woven fabric shall not be lower than 47.5g (-5%) nor higher than 52.5g (+5%).


Why not set the minimum weight? This is because non-woven fabrics are a very large category, and there are many process methods covered below, and simple comparison of weight is meaningless. When it's cold, we turn out an old quilted jacket and a down jacket. Will we just weigh the weight and put on the heavy old quilted jacket? The heat preservation performance of different process principles is naturally different, how can it be based on weight alone. So having said that, considering the performance of non-woven fabrics, you should not simply weigh them. No matter how heavy the spunbond non-woven fabric is, its performance is by no means as good as the spunbond-meltblown-spunbond (SMS) non-woven fabric.