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Most non - woven products are disposable products, can not be reused for what reason? Next we will give you a detailed explanation。
1。 Sterile barrier performance is lost after use
According to the research, the storage period of sterile articles is closely related to the thickness of non-woven fabrics and the number of coating layers. After a series of high temperature steam sterilization and chemical washing, the disposable non-woven packaging materials will have deformable fiber structure, sparse holes, decreased thickness, and even imperceptible holes in the naked eye, and the bacteria resistance rate will suddenly drop or lose the bacteria resistance performance. The requirements for packaging materials in the technical specification for disinfection are as follows: during the storage process, provide a bacterial barrier to maintain a sterile state. If the disposable packaging materials are used again and again, the sterilized storage cannot reach the safe expiry date.
2。 Internal microscopic properties change after sterilization
Non-woven packaging materials are generally SMS composite non-woven fabric。 The main material of this kind of non-woven fabric is polypropylene, which is processed through melt spraying and spun-bonding process through multiple processes, and the microstructure is fine plastic fiber (see the picture below)。 In the case of high temperature shrinkage is the characteristics of plastic products, real high temperature plastic is not, high temperature resistance is a relative concept, so the non-woven fabrics in micro fabrics will produce the corresponding shrinkage reaction。
After high temperature sterilization, non-woven fine plastic fiber will have a certain degree of shrinkage, which is reflected in the use of non-woven fabric after sterilization is more brittle than before sterilization, flexibility has been reduced. The change of nonwoven packing materials is one of the reasons why nonwovens can only be used once.