Numerous variables may alter the physical qualities of spunbond nonwoven fabric throughout the manufacturing process. Analyzing the link between these variables and product performance enables accurate control of process parameters and the production of high-quality polypropylene spunbond nonwoven machinery with a broad application range. If you’re interested in learning how to regulate it in a nonwoven machine, please have a look!
Polypropylene chips MFI
The molecular weight, molecular weight distribution, isotacticity, melt index (MFI), and ash content are the primary quality indicators for polypropylene chips. The melt index is a measure that indicates the melt’s rheological qualities. Polypropylene chips for spunbond typically have a melt index of between 10 and 50. When the melt index is increased during the spinning process, the viscosity of the melt decreases, the rheology improves, and the drafting resistance decreases. The drafting multiple will rise under the same drafting circumstances. When macromolecules are more oriented, the breaking strength of spunbond non-woven textiles rises, the fineness of the filaments decreases, and the fabrics look softer to the touch. The higher the melt index of polypropylene, the finer the particle size and the stronger the breaking strength.
As a result, we should choose high-quality PP material with the most appropriate MFI.
Temperature of spinning
The spinning temperature is determined by the melt index of the raw material and the requirements for the product’s physical qualities. The source material’s melt index determines the spinning temperature, and vice versa. The spinning temperature is proportional to the viscosity of the melt, and the temperature is low. The melt’s viscosity is high, spinning is difficult, and it’s easy to generate broken filaments, stiff filaments, or thick filaments, all of which degrade the product’s quality. Thus, in order to decrease the viscosity of the melt and enhance its rheology, the procedure of raising the temperature is often used.
It is worth mentioning, however, that under particular cooling circumstances, if the spinning temperature is set too high, the resultant yarn may not cool quickly enough, and some fibers will break during the drawing process, resulting in flaws. The spinning temperature should be between 220-230°C in real manufacturing.
SUNTECH nonwoven equipment has an easy-to-adjust temperature control system.
Drafting
The drafting degree of the fiber is mostly determined by the cooling air volume and the suction air volume during spunbond manufacture. The greater the volume of cooling air and suction air, the quicker the drafting speed, the more thoroughly drafted the fiber is, the more molecular orientation is achieved, the fineness becomes thinner, the strength increases, and the elongation at break decreases.
The physical qualities of spunbond nonwoven machinery is determined by the structure of the fiber network. The finer the fibers, the greater the degree of irregularity in the fiber arrangement during web laying, the more uniform the web, the more fibers per unit area, the smaller the web’s longitudinal and lateral strength ratios, and the larger the breaking strength.
Thus, raising the suction air volume improves the homogeneity of spunbond non woven materials while simultaneously boosting the breaking strength.
However, if the suction air volume is excessive, the wire is easily broken. In real manufacturing, the process must be changed appropriately to meet the demands and circumstances at hand in order to produce high-quality goods.
SUNTECH non woven machinery utilizes cutting-edge drafting technology to give consumers with superior finished goods.
SUNTECH strives to serve clients with reliable and efficient non woven machine; if you are interested in nonwoven machinery, please visit our website at www.suntech-health.com or contact us.
