The adhesive tape is made by coating glue on one side of BOPP base paper after high voltage corona. Glue contains formaldehyde, and long-term contact with vegetables will lead to vegetable pollution. There is a high demand for the production of food-grade adhesive tape, and there are strict requirements for rubber residue and its components. At present, there are no relevant national or industry standards, and they are all produced according to the company's standards.
The harm of adhesive tape is not as serious as people think. During the production, processing and storage of adhesives, most solvents have volatilized and additives have migrated, so the content of harmful components is still very small. The adhesive tape used to bind vegetables is similar to the commonly used transparent adhesive, and consists of polypropylene film and adhesive. Polypropylene film is usually used in food plastic bags and fresh-keeping boxes, and it is a safe raw material for food packaging. It is rare to bind vegetables with tape, which may be seen in supermarkets. In addition, the contact area between tape and vegetables is not large.
Adhesive tape is made of plastic and adhesive. There may indeed be some formaldehyde residue after polymerization, which may also be the source of this legend. However, from the test results submitted by local food and drug supervision departments and the media, no obvious formaldehyde residue was found. To be on the safe side, you can directly discard the parts of vegetables tied with tape, or you can choose to buy vegetables tied with straw and plastic wrap.