AUTOMATIC SYSTEM TO CONTROL THE ANISOTROPY OF NONWOVEN FELTED WEBS
Journal Title: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork - Year 2018, Vol 0, Issue 1
Abstract
The webs produced using a card as former system generally keep the fiber orientation. This effect is not very important for a great number of applications. But if an even pore distribution is necessary or the mechanical properties are to be uniform in all directions, then this system doesn’t work very well. Some years ago, it has been introduced a drafting operation of the web between the pre-needling and the final needling operations, as a solution. However, this alternative has a problem: there is no way to adapt it to variations in fiber orientation in the web. Taking into account these considerations, a new technological solution has been specifically devised to control the fibre orientation during the drafting operation in pre-needled felts. A prototype is used as drafting unit with the rolls driven by stepper motors and controlled by computer. Two video cameras collect images of the surface of the web, before and after the drafting operation, and process them in a computer. The values of the images textural descriptors, are calculated and compared. It is intended an increase in entropy which means that the web become less ordered and this is the situation we are aiming for. A computer program will adjust automatically the speed and pressure of the drafting cylinders so as to achieve the best possible situation in terms of the isotropy of the final product and, consequently, MD:CD ratio close to 1.
Authors and Affiliations
Nuno BELINO, Mário NUNES, Paulo FIADEIRO
Keywords
Related Articles
- EP ID EP430828
- DOI -
- Views 54
- Downloads 0
BAGGING BEHAVIOUR OF EXTENSIBILE SHIRT FABRICS
Fabric bagging is a type of three dimensional permanent deformations of garments that occurs at positions such as elbow and knee. When a prolonged compression force is exerted on a garment during wear, the three dimensio...
DYE REMOVAL FROM AQUEOUS SOLUTION BY MAGNETIC HYDROGEL
For coloration of products, dyes are used in various industries such as pulp, paper, leather, pharmaceuticals, and textiles. Disposal of colored textile wastewater into the environment, without efficient treatment, impos...
ASSESSMENT CRITERIA OF FUNCTIONALITY GEOTEXTILES USED IN ROAD CONSTRUCTION
This work was performed in order to assess the functionality of geotextiles used in road construction. To increase the quality of road works requires the use of geotextiles in their structure. Depending on the role and t...
APPLICATIONS OF SPACERS MADE WITH DOUBLE BAR RASCHEL MACHINE
Nowadays, textile technologies develop to adapt their different techniques for creating new products for the different sectors of application every day. Particularly, warp knitted fabrics and warp-knitting technology hav...
CLASSICAL AND MODERN VISIONS ON BOW TIES
The bow tie is a ribbon of material tied around the collar in a manner that forms symmetrically opposed two loop-shaped ends. The craft originated around the 17th century during the Prussian wars, when the Croatian merce...