Textile Journal of Uzbekistan


The article describes various methods of obtaining paper. The problem that exists in the manufacture of banknotes, securities and other security documents that use security threads and other elements that can be embedded partially or completely in paper is substantiated. These protective elements, as a rule, have metal, magnetic, microminiature, printed, and luminous filaments, which in most cases use aluminum deposited in vacuum. These approaches lead to particularly high costs due to the multi-stage process, and the use of metallized tape can not always provide optimal results in terms of protection. The article also describes the requirements for fibrous materials for forming paper pulp: fibers must have good flexibility; split into individual fibrils; molecular forces must provide reliable bonding of the fibers to ensure the mechanical strength of the paper. Based on studies, it is proved that natural silk fibers having a fibrillar structure, with a chain length of up to 15 · 18-8 m and a core thickness of 45 · 10-11 m, satisfy these requirements. The molecular weight of silk fibroin reaches 150,000, they are well split in massrol and the total inner surface of fibrous fibroin reaches 210 m2/g, which firmly covers other components of the raw material and affects a significant increase in paper strength. The continuous technological process and method of manufacturing a security paper for counterfeit securities by using fibers and threads of natural silk are described in detail

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