Aspect prediction of the knitted fabrics from the yarn properties

The textile technologist knows that the prediction of the aspect of a finished knitted fabric, by the parameters of yarn evenness, does not agree, often, with the reality. There are fabrics, in the market, with irregular aspect, made with yarns in which we have detected few faults. The conventional criteria that are considered in the evenness measuring equipments for the faults detection in the yarns are very limited.In this paper a new evenness of mass index is proposed, denominated deviation rate DR, that, according to it is demonstrated in the experimental stage, it follows an excellent statistical correlation with the aspect of the knitted fabrics.Peer ReviewedPostprint (published version

Relation entre la solubilité alcaline et les paramètres de traction d'un filé de laine peignée soumis à des traitements acides et oxydants

Un hilado de lana peinada ha sido sometido a tratamientos ácidos y con peróxido de hidrógeno a efectos de preparar sustratos que presentan un amplio intervalo de solubilidades alcalinas. Se han relacionado los parámetros de tracción con la solubilidad alcalina de los correspondientes sustratos. Este estudio ha permitido ampliar la información sobre el motivo del aumento de la solubilidad en álcali producido por el blanqueo con peróxido de hidrógeno. Se ha relacionado la solubilidad alcalina de la lana con la tenacidad, elongación, módulo y trabajo de rotura.A worsted yarn has been subjected to acidic and hydrogen peroxide treatments in order to prepare substrates having a wide range of alkali solubilities. The tensile parameters of the resulting substrates have been related with their corresponding alkali solubilities. This study has allowed to obtain more information on the cause of the increase in alkali solubility produced during wool bleaching with hydrogen peroxide. It has also been possible to know how the alkali solubility of wool is related with other parameters (breaking elongation, modulus and work of rupture) of the studied yarns.Un filé de laine peignée a été soumis à des traitements acides et au peroxyde d’hydrogène pour préparer des substrats présentant une grande fourchette de solubilités alcalines. Les paramètres de traction ont été associés à la solubilité alcaline des substrats correspondants. L’étude a permis de compléter l’information sur les raisons de l’augmentation de la solubilité alcaline produite par le blanchiment au peroxyde d’hydrogène. La solubilité alcaline de la laine a été associée à la ténacité, à l’élongation, au module et au travail de rupture

Estudio de la influencia del lavado y del ensimaje sobre la estabilidad de hilatura y las propiedades de los hilados.

En el presente trabajo se estudia la influencia de un lavado deficiente de la lana sobre la estabilidad de hilatura y las propiedades de los hilados. El motivo de este estudio es solucionar el problema de la acumulación de residuos no hilables en los órganos de la máquina de hilar, que repercuten negativamente en la hilatura y en las propiedades de los hilados. Este problema fue abordado en un trabajo anterior (julio 91) en el que se analizó la influencia de la intensidad del aclarado, sin encontrar ninguna correlación con los problemas que se presentan durante la hilatura.This paper studies the influence of a faulty scouring of wool on the spinning stability and properties of yarns. The objective of the study is to solve the problem caused by the accumulation of non-spinnable residues in the organs of the spinning frame which adversely affect spinning and yarn properties. This problem was dealt with in a former paper (July 1991) in which the influence of rinsing was analyzed without finding any wrrelation with the problems occurring during the spinning process.Dans ce travail, on étudie l'influence d'un lavage déficient de la laine sur la stabilité de filature et les propriétés des fils a tisser. Cette étude vise à résoudre le probleme de l'accumulation des résidus non filables dans les organes des métiers a filer, qui ont des répercussions negatives sur la filature et sur les propriétés des fils a tisser. Ce probleme a déjà été abordé dans un travail antérieur (juillet 91), dans lequel l'influence de l'intensité du rincage a été analysée, sans trouver de corrélation avec les problemes quise posent au cours de la filature.Peer Reviewe

New Development in the core yarns manufacture

A new mechanism for the regulation of feeding tension of elastic filaments has been developed, in cooperation with a reputable manufacturer of textile machinery, to obtain “core spun” yarns. This device reduces, of a very significant form, the coefficient of variation of the elongation of the yarn and, consequently, the fabrics obtained with this yarns are more regular appearance. This mechanism is fundamental when the new spools of T-400, with diameter and weight superiors to the standard size, are processed.Postprint (published version

Faster, higher, stronger

Citius, altius, fortius. If the ITMA fair is often viewed as the Olympic Games motto of “Faster; Higher; Stronger” is just as true for the laboratory equipment and testing sector. They too, not only for production machinery, meet these high requirements. Daniel Palet, Dipl Eng, CTextATI, deputy manager of the Technical Innovation Centre (CTF) at the Universitat Politècnica de Catalunya, Barcelona Tech (UPC), took a walk through the companies to see who had new innovations, new developments and also testing improvements made to existing well know equipment

Redescubriendo las fibras animales: fibras inteligentes

Postprint (published version

Faster, higher, stronger

Citius, altius, fortius. If the ITMA fair is often viewed as the Olympic Games motto of “Faster; Higher; Stronger” is just as true for the laboratory equipment and testing sector. They too, not only for production machinery, meet these high requirements. Daniel Palet, Dipl Eng, CTextATI, deputy manager of the Technical Innovation Centre (CTF) at the Universitat Politècnica de Catalunya, Barcelona Tech (UPC), took a walk through the companies to see who had new innovations, new developments and also testing improvements made to existing well know equipment.Postprint (published version