Ranji’s research and injection theory and compounding techniques were discussed; the formulation of the pouring agent was drawn up and tested after the fiber was oiled, and it was proved that its antistatic and smooth properties can meet the requirements. Most of the oils used in nylon high-elastic yarns and polyester low-elastic yarns still rely on imports, so the problem of localization of oil production is quite prominent.
In addition to the characteristics of general polyester with high breaking strength and elastic modulus, excellent heat setting, good resilience, heat resistance, light resistance, strong corrosion resistance, easy washing and quick drying, it also has high bulkiness, Good heat insulation, comfortable hand feeling, soft luster and so on.
Low-stretch yarn also has a sewing effect. Overlocking is also called overlocking, which is called overlocking in English. This process is required for all clothing pieces. Since the main purpose of the overcoat is to prevent the yarn of the piece from falling apart, the demand for the strength of the overcoat is not high. In order to save costs, the overburden thread is generally made of polyester network yarn, without twisting, and its strength is lower than that of sewing thread. It is different from ordinary sewing thread in that the overburden thread is made of polyester filament without twisting, while the sewing thread is made of polyester staple fiber with twisting.