Injection molding and modification of engineering plastics. Nylon chip is a flaky granulation product obtained by granulation method because of its low melt strength in nylon production. Nylon is the trade name of polyamide fiber, also known as nylon. Nylon chips are used for injection molding and modification of engineering plastics, and can also be used for HOY spinning and monofilament spinning. Nylon and polyester are crystalline polycondensates, and the melt strength of their resins is very low, so they cannot be stretched and granulated, so they can only be heated under water.