Abstract: A method for analyzing molecular weight of the poly-p-phenylene terephthalamide (PPTA) utilizing near infrared spectrum is provided for reducing the time required to analyze the molecular weight of PPTA. The method uses PPTA samples to build a spectrum-viscosity fitting curve. The molecular weight of an unknown PPTA is analyzed via a near infrared analysis software and the spectrum-viscosity fitting curve. The method is beneficial in that it has a short process time and high reliability.

Abstract: A method for producing a towel with ultra-long looped piles is provided. First, a looped pile| is woven by using three weft yarns when weaving a towel, a fixed connecting structure for fixedly connecting looped piles is disposed outside every two looped piles| or every three looped piles, and the fixed connecting structure is formed by fixedly connecting 3 to 5 weft cotton yarns. Water soluble weft yarns are disposed between the every two looped piles| or the every three looped piles, and the water-soluble weft yarns are used as weft yarns for separating and fixedly connecting adjacent to looped piles. Then, the water-soluble weft yarns are dissolved in a dyeing and finishing process, so that the original two looped piles| or three looped piles| form one looped pile, thereby increasing the length of a looped pile, so that the towel is fluffy and soft in hand feeling, and is not easily damaged when being hooked.