Precautions for microwave drying and sterilization of tea bags in mesh bags
The combination of health tea and herbal tea bags often uses non-woven mesh bags and food grade mesh bags for ...
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The combination of health tea and herbal tea bags often uses non-woven mesh bags and food grade mesh bags for packaging. The raw materials include petals, stems and leaves, seeds, grains, Chinese medicinal materials, etc. The texture is loose, easily hygroscopic, and comes with dormant insect eggs and microorganisms. Using microwave equipment to dry and sterilize tea bags as a whole can save the need for unpacking and rework, and avoid secondary pollution. However, tea bags are lightweight and thermally sensitive materials with low process tolerance. Improper operation can easily cause discoloration, aroma evaporation, bag bulging, and local drying.
Especially in the hot and rainy season, ordinary air drying, air drying, and ultraviolet disinfection and sterilization cannot deal with the deep hidden dangers inside the tea bag, and the packaged finished products are prone to moisture, acid, insects, and mildew, which is a very troublesome quality control problem for tea bag processing plants.
Nowadays, more and more tea companies are adopting the integrated process of microwave drying, sterilization, and insecticide eggs for finished mesh tea bags, which does not require unpacking or secondary packaging, effectively avoiding secondary pollution.
Firstly, it is necessary to confirm the packaging material and prevent metal materials from entering the site
Aluminum plated film, metal wire, laminated sealed bags, and laser materials are strictly prohibited from entering microwave equipment during production, as they may cause sparking, uneven heating, and material burns.
Pure non-woven fabric, food grade mesh bags, and breathable cotton mesh materials can be used. If the outer layer is sealed with plastic, it is necessary to open it for ventilation or remove the outer bag to avoid the inability to discharge water vapor during the heating process, which may cause bulging, swelling, and deformation.
In addition, when laying materials, they need to be placed flat in a single layer, and stacking processing or large sections of empty materials are prohibited. Ensure that the tea bags are heated evenly, dehydrated consistently, and have consistent sterilization and egg killing effects, resulting in stable quality throughout the entire batch.
Finally, the greatest value of health tea and herbal tea lies in their natural aroma and natural appearance. Microwave processing does not rely on high-temperature processing to meet standards, but on penetration technology.
The device can gently penetrate the inside of the tea bag, achieving a drying and sterilization effect at around 75 ℃, and inactivating dormant insect eggs in the flower buds and seeds; Kill mold and miscellaneous bacteria, reduce the total number of bacterial colonies. At the same time, there will be no burnt edges, blackening, or aroma evaporation.
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