1. The influence of molecular weight. Nylon, also known as nylon, is a general term for polyamide materials. It is obtained by the polymerization of monomeric substances containing an amide group - cONH - by ring-opening{. The macromolecules of this polymer are assembled in chains, and the monomers before polymerization become the chain segments of the chain macromolecules. Due to the limitation of processing technology, the length of the polymer macromolecular chains cannot be equal, so the molecular weights are not equal. Rather, it is distributed within a certain range. Under certain conditions, the strength of the nylon bonded thread will increase with the increase of the molecular weight of the macromolecules, but the increasing speed of the strength is not obvious when it increases to a certain level. The molecular weight distribution range of the polymer also affects the strength of the fishing line. The nylon line with a wide distribution range has low average strength, high elongation, poor fatigue resistance, and large strength unevenness. Therefore, the molecular weight distribution of the material used to make the fishing line The narrower the better,

2. The influence of hydrogen bonding. Nylon bonded thread material has many hydrogen bonds between macromolecules, so nylon is a kind of synthetic material with higher strength, and nylon itself is divided into many kinds. Different brocade materials have different numbers of hydrogen bonds in their contents, and the strengths are quite different. The materials used to make fishing lines are mostly varieties with more hydrogen bonds between macromolecules.

3. The influence of the binding molecules in the amorphous region in the supramolecular structure. According to the internal supramolecular structure of nylon bonded thread. It can be divided into crystalline region structure and amorphous region structure. Inside the crystal structure, due to the strong hydrogen bonds, the crystallinity and crystal size have little effect on the strength of the fishing line, and the breaking of the fishing line mainly occurs in the weakest link inside the fishing line. That is, the breakage of the bound molecules in the amorphous region (ie, the amorphous region). Therefore, the number of binding molecules in the amorphous area directly affects the strength of the fishing line.

4. The influence of orientation degree on the strength of nylon bonded thread. The degree of orientation refers to the degree of parallelism between the nylon bonded thread macromolecules and the axis of the fishing line, and is an important parameter reflecting the supramolecular structure of the fishing line. It is one of the important factors that determine the physical and mechanical properties of the fishing line.

Generally speaking, the higher the degree of orientation, the higher the breaking strength of the nylon bonded thread and the lower the elongation; on the contrary, the lower the degree of orientation, the lower the breaking strength of the thread and the higher the elongation, which is why we often use nylon bonded threads. One of the reasons why the thread is divided into three types: high-strength and low-strength, medium-strength and medium-stretching, and low-strength and high-stretching.