How to evaluate the pros and cons of non-woven

Several times I was invited to do the packet the judges of the contest. Written exam I always ask 'non-woven packaging of sterile items is valid for how long? 'The teacher can usually answer it WS 310. 2 - 2009 rules is half a year, but note that the original specification in the phrase 'the period of validity should be for six months' a 'should be' the word is not much. We know the WS 310 words very rigorous, have 'should be', 'appropriate', 'to' three levels, non-woven valid for 6 months is conditional, that is in line with the requirements of GB/T 19633 ( See the WS 310. 1 - 2009). 。 Here when it comes to the GB/T 19633, the name of this specification is 'at the end of the sterilization of medical devices' packaging, equivalent to the ISO 11607:2003 standard. The teacher will ask, these standards at the front of the letter is what mean? GB, ISO international standards, is 'national standard' the word of pinyin initials, WS 'health' is the word of pinyin initials, sometimes you will see the YY, it is the first letter of the 'medicine' two words. And the teacher asked the inside of the GB/T T what does it mean, this is the 'push' the word 'recommended' pinyin initials. Many teachers when judging non-woven advantage, will use the index of 'g'. Think gram per square meter, the greater the non-woven fabric is thick, bacteria resistance effect is better. Just now we talked so many specifications, whether for medical non-woven packaging material rules from 'g', is there a minimum? Precisely, the concept of 'minimum gram' does not exist ( I will explain again later) , only 4 of DIN EN ISO536. 2. 1. Chapter 2 rules for each batch of non-woven fabric gram weight fluctuations shall not exceed 5% of the declared value. Namely that 50 g g, the actual gram weight is not less than 47 non-woven fabrics. 5g( - 5%) Also shall not be higher than 52. 5g( + 5%) 。 Why not stipulated minimum gram? This is because the non-woven fabric is of a very large and the following covers the process method is very much, simple comparative weight is meaningless. It was cold when we dig out a piece of old cotton-padded jacket and a down jacket, will just weigh weight is put on thick cotton-padded jacket? Process principle of different natural thermal performance difference is big, which can be light in weight. So then, considering the performance of non-woven fabric should not simply weighing. Spun-bonded non-woven again heavy, its performance is absolutely not spun-bonded - Melt-blown - Spun-bonded ( SMS） Non-woven fabric.