Examinando por Materia "Dehairing"

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Effect of fibre diameter, prickle factor and coarse fibre bias on yarn Surface hairiness in South American Camelids (SAC) Fibre.
(MDPI, 2022-02-10) Mamani Cato, Rubén Herberht; Narciso Frank, Eduardo; Prieto, Alejandro; Castillo, Maria Flavia; Condori Rojas, Nicoll; Hick, Michel Victor Hubert
It is well known that objectionable fibres emerge from the surface of the yarn due to the centrifugal force of the spinning device. Furthermore, the hair removal process is based on the same physical principles. However, the fibres that are >30 um (PcF) are the fibres that appear in the hairiness of the yarn and are eliminated by dehairing. It has always been presumed that the PcF was linearly correlated with the diameter of the fibre (MFD) in llamas, but not so in alpaca fibres. Nevertheless, there is evidence that this relationship is curvilinear and behaves the same way in both species. The objectives of this study are to explore the relationship between MFD and PcF in both llamas and alpacas, to explore the existence of a breaking point (BP) in this curvilinear relationship, and to determine the frequency of fleeces that do not require dehairing because the PcF <= 3.2%. In addition, the existence of a positive bias of coarse fibre content on the hairy surface (CFs) of the yarn to coarse fibre content within the yarn fibres (CFy) was determined, which may explain the effect of the dehairing on the prickle factor of SAC fibres. The relationship of PcF on MFD behaves the same way in alpacas and llamas. It conforms to a power distribution and presents a BP of 23 um, with PcF being constant before the BP and increasing significantly after it. Most animals (<=91% of alpacas and <=87% of llamas) are above the threshold (<=3.2%), requiring dehairing to correct it. By means of a shaving technique on the surface of the fabric sample, it was established that the objectionable CFs content is 8.15% higher than the objectionable CFy content. In the evoked-coarse fibre in the dehaired samples, a CFs-CFy difference below 5.9% (p > 0.05) is not significantly detected by panellists. The surface MFD is more than 2.7 um coarser than the yarn MFD.
Perception of Prickliness in Fabrics made with Dehaired and Non-Dehaired Llama Fiber and its Relationship with Fiber-Based Variables detected by Consumers
(Past knowledge people, 2020-04-14) Frank, Eduardo; Hick, Michel Victor Hubert; Seghetti Frondizi, Diego G.; Mamani Cato, Rubén Herberht
The prickling is a problem in natural animal fiber, but there is no an allergic but a mechanical problem. In this manner, dehairing is a pre-textile process that permit extract objectionable (coarse) fiber and then improve the fabric quality. The objective of this study is to determine the variables of the fiber diameter and fiber frequency may be indicative of the effect of the dehairing on prickliness of Llama fiber fabrics that can be detected by consumers of knitting fabric garments. The variables that panellists consumers can detect when comparing dehaired and non-dehaired fibres are: overall fibre diameter (in fabric and surface), fibre diameter coefficient of variation (significate in yarn); fibres coarser than 30 μm (in yarn and surface); coarse fibre by weight (in yarn and in surface); coarse fibre mean diameter (in yarn and in surface). These differences are explained mainly by the lattice medulated fibre diameter (in yarn and in fabric surface); non-medulated fibre diameter (only in surface); and lattice medulated fibre frequency (only on fabric surface). It can conclude that: the variables that indicate differences in the frequency of coarse fibres (objectionable) are the ones that best indicate the prickle (itching) effect, both inside the yarn and in the protruding fibre tips on fabric surfaces.
The Prickle Effect Comes From Fabrics Made of South American Camelid (Alpaca and Lama) Fibers. Mechanical and/or Genetic Solutions
(Society for Science and Education, 2021-06-25) Prieto, Alejandro; Castillo, Maria Flavia; Seghetti Frondizi, Diego G.; Mamani Cato, Rubén Herberht; Hick, Michel Victor Hubert; Frank, Eduardo
In this paper we intends to analyze the physical attributes that determine the comfort of fabrics made of South American Camelid fibers (Lama and Alpaca), the effect on their value and their possible mechanical and/or genetic solutions. While emphasis has always been on mean fiber diameter, the fiber frequency exceeding 30 microns has a key role in quality. This is essential for light fabrics, where the effect of prickle plays a critical part in consumer´s choice. Yet the genetic solution of the problem lies in the slow selection response. Dehairing provides an immediate solution, though excessive fiber breakage should be addressed. It is concluded that the textile fiber quality of South American Camelids is promissory if the presence of objectionable fibers is solved, resulting in a tolerable frequency for consumers (<3%). This process could be explored via genetic selection or applying dehairing technology. This implies a true paradigm shift with regard to the classic textile processing of Alpaca and Lama fibers. This would enhance the fiber softness to touch, together with other important features that would render the fiber price more competitive.