The main function of packaging materials for bacteria articles is to allow air and sterilization medium (such as steam) to pass through, and at the same time to provide biological barriers for sterile articles, thus ensuring that sterilized articles remain sterile for a certain period of time during transfer and storage. Aseptic packaging materials used in China's disinfection and supply centers mainly include cotton cloth, crepe paper, paper-plastic packaging bags, non-woven fabrics and rigid container boxes.
In selecting packaging materials for sterile articles, each hospital supply room or disinfection supply center is mainly selected according to its convenience in use, sterile storage period and price.
Medical paper-plastic packaging bag is made of a layer of special paper and a layer of PET-PP plastic composite film after heat sealing treatment. It is breathable, transparent and visible. One side of the transparent plastic film is provided with a sterilization indication mark, which can indicate whether sterilization has been carried out. Medical paper-plastic packaging bags need to be sealed at both ends by a special thermal sealing machine when in use, which has the disadvantages that one side is breathable, and some articles (metal instruments, surgical lampshades) are easy to produce condensed water during sterilization, and can only be used after verification. The effective aseptic storage period of sterile articles packaged in general medical paper-plastic packaging bags is 6 months. The specific aseptic guarantee time shall be subject to the statement issued by the manufacturer.
The loading method of medical paper-plastic packaging bags is to place the paper-plastic vertical separation gap. This is because relative to the paper-plastic vertical separation gap, the paper-to-paper vertical separation gap has a slightly higher wet wrapping rate, while the paper-to-paper flat stacking or paper-to-plastic flat stacking is prone to sterilization failures such as wet wrapping.
The main material of medical non-woven fabric packaging material is polypropylene, which has the structural characteristics of small fiber gaps and random arrangement, thus significantly reducing the possibility of microorganisms or dust particles being transferred.
Medical nonwoven packaging materials are disposable and cannot be reused. When selecting non-woven fabrics, the bacteria resistance, tensile strength and air permeability of non-woven fabrics should be considered in terms of performance. Compared with traditional cotton cloth, medical non-woven fabrics have different characteristics: aseptic packages can be stored for a longer period of time (generally 6 months for double-layer non-woven fabrics); Disposable articles will not produce cotton dust, thus causing air pollution; Has a good balance of ventilation and bacteria resistance; Medical nonwoven fabrics are suitable for pressure steam sterilization and EO sterilization, but nonwoven fabrics containing plant fibers are not suitable for low temperature plasma sterilization.
