Nylon String Trimmer Lines Manufacturers

During the melt extrusion process, how do nylon line trimmer line manufacturers control the temperature and extrusion speed in the machine to ensure the uniformity and stability of the mowing line?

1. In-machine temperature control
Preheating temperature setting:
Nylon materials need to be preheated within a certain temperature range to achieve better fluidity and processing performance. Generally, the preheating temperature should be set at about 10°C above the glass transition temperature of the nylon material, and the specific temperature needs to be adjusted according to the type of nylon material and the actual situation of the processing equipment.
Feeding zone temperature control:
The feeding zone temperature determines the melting degree and fluidity of the material. It is generally more appropriate to set it at about 20°C above the melting point of the nylon material. Too high a temperature may cause the material to overheat and decompose, while too low a temperature will make the material too viscous and affect the extrusion effect.
Discharging zone temperature adjustment:
The discharging zone temperature has a direct impact on the surface quality of the processed product. Generally, the discharging zone temperature should be slightly lower than the feeding zone temperature to avoid defects such as bubbles and wormholes on the product surface.
Heating method selection:
Manufacturers may use efficient heating methods such as electromagnetic heating to ensure uniform heating and precise temperature control. Electromagnetic heating has the advantages of fast heating, energy saving and high efficiency, and precise temperature control.
Temperature monitoring system:
Temperature sensors and monitoring systems are installed on the extruder to monitor the temperature of each area in the machine in real time to ensure that the temperature is always kept within the set range.
2. Extrusion speed control
Pressure control:
A certain extrusion pressure needs to be applied during the extrusion process to ensure that the molten nylon resin can be extruded smoothly. Increasing the extrusion pressure can increase the extrusion speed, but too high pressure may cause blockage of the extruder or surface defects of the product.
Screw speed adjustment:
The screw speed of the extruder is one of the key factors affecting the extrusion speed. Increasing the screw speed can increase the extrusion amount of nylon resin, thereby increasing the extrusion speed. However, too high a speed may cause excessive heat accumulation, leading to the decomposition of nylon resin.
Mold design optimization:
Reasonable mold design can reduce extrusion resistance and promote the rapid flow of nylon resin. The design of the mold should take into account factors such as the cross-sectional shape and size of the nylon product to ensure the quality and stability of the extruded product.
Operator skills:
The skill level of the operator in the extrusion process also has a great influence on the extrusion speed. Skilled operators can make fine adjustments according to the state of the extruder to achieve the best extrusion speed.

Does the nylon mowing line factory heat set or coat the nylon mowing line after twisting to enhance durability and aesthetics?

1. Heat setting treatment
Function and purpose:
Heat setting is a process that makes the thermoplastic fiber and its blended or interwoven fabrics relatively stable. For nylon mowing line, a product made of nylon resin, heat setting can effectively prevent it from being deformed due to heat or force during subsequent use, thereby improving its dimensional stability and durability.
Heat setting can also improve other properties of nylon mowing line, such as wet rebound performance and pilling performance, making it more stable and reliable during use.
Process:
During the heat setting process, the nylon mowing line will be treated under tension at a slightly higher temperature than the subsequent process. This can eliminate the internal stress generated by the fiber during the manufacturing process and prevent it from wrinkling and deformation during subsequent processing or use.
2. Coating treatment
Function and purpose:
The coating on the surface of nylon mowing line can increase its service life and performance. The coating can effectively reduce the effects of exposure, wind and rain, dust and chemical corrosion on nylon mowing ropes during use, and protect their surface from damage.
The coating can also make the surface of nylon mowing ropes smoother, improve their wear resistance and tensile strength. This is especially important for mowing ropes, which need to frequently rub against hard objects such as grass leaves.
Coating types and effects:
There are many types of coatings on the surface of nylon mowing ropes, such as polyurethane, zinc-chromium alloy, water glass, polyester, etc. Different coatings have different functions and characteristics. For example, polyurethane coatings can improve wear resistance and anti-puncture ability, and zinc-chromium alloy coatings can improve corrosion resistance and salt spray resistance.
3. Combined with the production process
According to the production process of nylon mowing ropes (raw material preparation → melt extrusion → cooling and shaping → rope twisting → post-processing → quality inspection), post-processing steps are usually carried out after twisting, which includes heat setting or coating treatment. These treatment measures are designed to further improve the durability and aesthetics of nylon mowing ropes to meet market demand.