1, silk and cotton tulle should be the earliest packaging materials used to make teabags, but they are rarely used now. The main chemical component of silk is protein fiber (composed of amino acids), while cotton yarn is plant cellulose (macromolecular polysaccharide, the main component of plant cell wall). Generally, both of them are harmless to human body, but the processing and packaging performance is poor.
2, nylon filter cloth, nylon is polyamide fiber, colorless and odorless food-grade nylon filter bag meets the national food packaging hygiene standards, through its transparent high-quality heat-resistant mesh cloth, you can see the real tea, which is a new type of tea packaging filter material that ordinary filter paper tea bags can't match.
3, PET yarn, PET is the abbreviation of polyethylene terephthalate, which is a kind of polyester fiber. As a tea bag packaging, it has the characteristics of high texture and transparency, and at the same time has excellent bag-making and shape retention. Generally, there is no dissolved substance during soaking, which is harmless to human body and environment. However, this kind of fiber has relatively poor tolerance to pH at high temperature, and may not be suitable for brewing some tea.
4. Polylactic acid (PLA) biodegradable fiber is a biodegradable material made of plant starch, which can be decomposed into carbon dioxide and water in natural soil. It is the most promising new generation of sustainable green filter material, leading the international tea fashion, and will become an irresistible trend of tea packaging in the future. PLA fiber is biocompatible and can be safely implanted into human body, so it generally has no toxic or side effects. At the same time, PLA also has antibacterial and mildew-proof effects.
5. Other composite fibers, due to the poor packaging performance of filter paper or natural plant fibers, can be compounded with some synthetic polymer fibers to make packaging bags, such as heat-sealed filter paper compounded with polyvinyl acetate and polyvinyl chloride polymer fibers, such as compounding with some resins to improve the boiling water brewing resistance of filter paper. This kind of fiber may pose a high health risk to human body.
Most of the packaging of tea bags does not explain the material of tea bags: a businessman who runs tea in Tea City said that there are three main materials of tea bags on the market at present: filter cotton paper, non-woven fabric and nylon, and the first two are more common. The main raw material of filter cotton paper is imported wood pulp, which is low in price and production cost, but not resistant to foaming. Non-woven fabrics are moisture-proof, breathable, degradable and moderately priced, so they are developing rapidly. Most consumers pay more attention to the convenience of tea bags and the kind of tea they like, and seldom pay attention to the quality of tea bags. For the materials and precautions of tea bags soaked in drinking water with tea leaves, the outer packaging of most tea bags in the market has not been explained. A person in charge of the Industrial Development Department of China Tea Circulation Association said that in China, the consumption of teabags in tea is not large. The national standard for teabags is the national standard for teabags implemented in 20 10 1, but this is only a recommended standard. This standard is applicable to teabags with tea leaves as raw materials and packaged with filter materials. Among them, requirements are put forward for filter bag materials and auxiliary materials. The filter paper should be clean, non-toxic and tasteless, which will not affect the quality of tea and meet the national standards of corresponding materials (food grade). The lifting thread in the auxiliary materials should be the original white cotton thread without fluorescent substances, and bleaching is strictly prohibited. If nails are used for sealing, the nails shall meet the requirements of hygienic standards for food contact materials. Regarding the packaging of teabag products, whether it is necessary to explain the material of teabag and matters needing attention in use, such as how many degrees of high temperature resistance and the longest soaking time, the person in charge said that according to the current national standards, the material of teabag can be omitted from the packaging, and the relevant standards are still being improved.