The Introduction of Medical Sterilization Package And The Use of Non woven Fabric Performance Study

 Abstract:

CSSD of hospital, as the department of washing, disinfecting and sterilizing of medical device, is paid more and more attention by medical industry and society. Avoiding the defects of bad bacteria resistance, much tailing, wear down, cross-infection, heavy washing of traditional cotton, disposable nonwoven is welcomed by user because of its great performance and reasonable price.
Key words:
medical sterilization packaging material, nonwoven, classfication of nonwoven, resistance bacteria, performance changing

1. Types of packaging materials for medical sterilization
1.1 cotton
Cotton cloth is the traditional sterilization pouches material used in hospitals. Generally, it needs to use cotton cloth with a level of more than 120 yarns. In the production aspect of cotton cloth, the country still does not have unified standard, the cotton cloth that sells on the market almost does not accord with the standard of 120 that relevant norm requires. Studies have shown that the antibacterial rate of medical cotton cloth used for the first time is 48%, but after a series of disinfection, chemical washing, the antibacterial rate will drop to a sudden second time 17%, this is the highest number of knitted medical cotton cloth on the market to do the experimental data.

[1]. The Ministry of Health of China stipulates that cotton packaging materials and open containers should be stored at a temperature below 25 ℃ for a period of 10 to 14 days and should be shortened in wet and rainy seasons.

1.2 Hard sterilization box of metal or glass
Metal or glass containers should be automatically closed or with vent holes, should be cleaned before use can be used.

1.3 Disposable sterilization packaging non woven fabric
As new sterilizing packaging materials, disposable sterilizing packaging nonwoven cloth and disposable sterilizing packaging wrinkled paper are gradually replacing traditional cotton covering cloth. It has good air permeability and is easy to enter and discharge the sterilizing medium. It has good barrier performance of microorganism and dust.Appropriate tensile and tear strength; It has the advantages of low chip shedding, water resistance, non-toxic and harmless, and is easy for post-treatment.

1.4 Disposable sterile packaging wrinkle paper
Disposable sterilization packaging wrinkle paper as a disposable sterilization packaging non-woven packaging collocation material, it is required to meet the requirements of the above sterilization packaging non-woven. Compared with non-woven fabric, it has better air permeability and moisture permeability, and the post-treatment is also simpler.

1.5 Disposable sterilization packaging paper plastic packaging bag
Disposable sterilization packaging paper plastic packaging bag is made of special dialysis paper and composite film by the composite process, with the relevant sterilization color mark, easy to use, excellent asepsis barrier performance. Product approval from the Ministry of Health is required before it can be marketed.

2.Types of non-woven fabrics

2.1 According to the use, it can be divided into three kinds: ordinary non-woven fabric, non-woven fabric for sterilizing packaging and composite non-woven fabric. The ordinary non-woven fabric has no microbe shielding layer and does not have the resistance to bacteria; Composite non-woven fabric, and film high barrier, waterproof material composite, mainly play a role Waterproof, poor air permeability, generally used for surgery sheets, etc.

Medical sterilization packaging non-woven fabric is a kind of non-woven fabric with special microbial barrier layer, which has good tear resistance, tensile resistance and wear resistance, as well as good microbial barrier performance and dust barrier performance.

2.2 according to the chemical composition of the different, divided into plastic non woven fabric

(PP non woven fabric) and non woven fabric containing plant fiber. For hydrogen peroxide low temperature plasma sterilization, plant fiber nonwoven fabric is not; Compared with PP nonwoven fabric, plant fiber nonwoven fabric has better air permeability and moisture-proof performance.

2.3 According to the different melt-blown production technology of microbial barrier layer

Divided into SMS three - layer non - woven and SMMMS five - layer non - woven.Compared with SMS non woven fabrics, SMMMS non woven fabrics have more uniform microbial barrier layer, higher hydrostatic resistance, better softness and stronger tear resistance.

3.Nonwoven fabric antibacterial principle

The bacteria-resistance of breathable packaging materials is controlled by the size of the aperture, and it is also by multi-layer filtration to achieve the bacteria-resistance effect. Non-woven fabric through the microbial shield layer (M layer) of countless fine fibers irregular crosscrossing, forming the equivalent aperture of less than 50um, so as to achieve the resistance to bacteria, air permeability performance, can not only barrier microorganisms and dust, but also to facilitate the penetration of sterilization medium.

4.Performance changes before and after sterilization

Xinhua brand sterilization pouches non woven fabric is made of high temperature resistant polypropylene through melt-blown process after many processes, the microstructure is fine plastic fiber. Shrinkage after high temperature is the characteristics of plastic goods, there is no real high temperature resistant plastic, high temperature resistance is also a relative concept, so non-woven fabrics in the micro will have the corresponding shrinkage reflection. After high temperature sterilization, the micro fine plastic fiber of non-woven cloth will shrink to a certain extent, which is shown in use that the non-woven cloth after sterilization is more brittle than that before sterilization. After testing, it is found that the longitudinal and transverse tear resistance of non-woven cloth after sterilization is significantly higher than that before sterilization, but the flexibility is reduced.

This is one of the reasons why non-woven fabrics can only be used once.

5. Introduction of the problems in hospital use

5.1 wet package

First: the equipment is not thoroughly cleaned and dried, and there is water before packaging. Equipment should be dried thoroughly before packaging.
Second: the humidity of the steam in the sterilization cabinet is too high.
Third: insufficient drying time after sterilization.
Fourth: the sterilizer immediately take out the sterilization package after opening, there is no to be sterilization package cooling and then take out the condensate produced. Non-woven cloth is easy to wet package in the international is a final conclusion.The more common problem: the hospital in the use of non-woven packaging container equipment sterilization at random, so that there will be water in the mouth up container. The disinfection technical specification clearly stipulates that the mouth of the container should be placed at a downward incline. After sterilization, there is obvious water drop on the outside of the bag, which is on the sterilizer and the condensed water on the shelf. It has nothing to do with the wet bag, and it will dry after cooling in the pot. Non-woven cloth and cotton and wrinkled paper caused by different surface tension, water vapor is easier to form water droplets on the surface of non-woven cloth (especially metal and non-woven contact), and in cotton and wrinkled paper surface due to water droplets are dispersed and not easy to condense. Cotton and wrinkled paper themselves more easily absorb water, it does not appear wet wrap is not the absence of condensation, but is absorbed.

5.2 the melting

Some hospitals report that our non woven fabrics melt after high-pressure steam sterilization process. Experimental verification shows that the melting point of non-woven fabrics is above 150℃, and close to 150℃, there will be contraction, but it will not melt. Melting was caused by improper contact between the wrap and the wall of the sterilized garment pan.

5.3 the damage

The wear resistance and tear resistance of non-woven clothes must not catch up with cotton cloth. The tear resistance of each packing material is certain. Cotton cloth is the same, and too much force and unreasonable taking and placing method will cause destructive damage to packaging materials. For this damage phenomenon, should be prevented and avoided in the process of use, packaging of any device box, device frame and quality.
For large parcels, the dragging phenomenon in the process of taking, placing and transferring should be avoided. Handle with care to ensure the integrity of the package.

6.Disposable medical sterile packaging material has many advantages over traditional cotton covering cloth

As a new sterilizing packaging material, medical sterilizing bag nonwoven fabric is gradually replacing the traditional cotton covering fabric to become a new choice of sterilizing packaging. It has been accepted by the hospital disinfection supply center for its excellent antibacterial performance and low chip dropping performance. In terms of cost, many articles have done research, proving that disposable sterilization packaging materials are more cost-effective for regular hospitals. Compared with traditional cotton covering cloth, disposable sterilization packaging materials can save cleaning, ironing, labor, wastewater treatment and other costs, and greatly reduce the incalculable medical losses brought to hospitals by cross-infection in hospitals. Compared with the cost of comprehensive cotton covering cloth, disposable sterilization packaging material is more economical and practical.