Common problems and countermeasures in the production of medical sterile paper plastic bags
The medical sterilization paper plastic bag is a disposable medical sterilization packaging material, which has the advantages of good air permeability, good sterilization medium permeability, high bacteria resistance after sterilization, convenient chemical monitoring during sterilization, simple package sealing, good perspective, long Calendar-based contraceptive methods after sterilization, easy opening, etc. It can also significantly reduce the purchase cost, facilitate waste recycling, meet environmental requirements, and is a medical sterilization packaging material with good comprehensive performance. However, there are often some problems in the actual production of medical sterilized paper plastic bags. Here, the author mainly discusses common problems in the selection and design of sterile paper plastic packaging materials, as well as how to solve these problems, and shares them with the industry. The nature and expected use of the equipment to a certain extent determine the sterilization method, and different sterilization methods affect the material selection of the packaging system.
For example, ethylene oxide sterilization is not suitable for items with strong adsorption properties; Instruments with PE components are not resistant to high temperatures and are not suitable for high-pressure steam sterilization; For expensive instruments, a sterilization method with a short sterilization cycle is generally chosen to increase the frequency of use. Therefore, the nature of the equipment itself to a certain extent determines the packaging system to be used. Low temperature formaldehyde sterilization basically requires the same materials as steam sterilization, but the permeability of formaldehyde gas is relatively poor.
Plasma sterilization requires that the packaging materials constituting the packaging system do not contain biological fibers, because these materials can rapidly interact with oxidants and their Superoxide free radicals, resulting in insufficient concentration of sterilizer, leading to sterilization failure. The packaging material should have sufficient strength to prevent damage during the sterilization process. It includes the tensile strength, puncture strength, tear strength, and burst strength of the material. The material itself does not contain any potentially risky components, and also includes surface coating components of some packaging materials. Under normal and designated sterilization environments, the material is stable, does not decompose, does not split, and does not transfer potential harmful substances to the surface of packaging equipment. There are high requirements for the materials that make up the packaging system and the thermal sealing between different materials. When opening the packaging, there must be no fiber fragments.
Medical sterilization paper plastic bags are a part of medical sterilization packaging. Although the selection of materials meets the above requirements, there are also some other requirements. For example, the paper of medical sterile paper plastic bags should not be discolored, the pH value of the paper extract should be within the range of 5 to 8, the fluorescence brightness should not exceed 1%, the ultraviolet radiation source should be irradiated at a distance of 25cm, the number of fluorescence points per 0.01 square meter with an axis length greater than 1mm should not exceed 5, the hydrophobicity of the paper should not be less than 20 seconds, the average pore size of the paper should not exceed 35 microns, and the maximum value should be less than 50 microns, There are also certain requirements for the breathability and water absorption of paper, which also need to meet the requirements of paper printing.
In addition, when selecting medical sterilized paper plastic bags, the operability of the materials should be fully considered. For example, PP film and PE film are very common plastic films. Although these plastic films also meet the requirements of medical packaging materials, they are rarely directly used in medical paper plastic packaging bags. Due to their inconvenience in bag making, most of them are used after PP film or PE film is compounded or co extruded with other materials.