Banca de DEFESA: JONATA SILVA DO NASCIMENTO ANDRADE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JONATA SILVA DO NASCIMENTO ANDRADE
DATE: 18/04/2022
TIME: 10:00
LOCAL: Remoto - meet.google.com/qpw-oeh-cndy
TITLE:

Tribological Analysis on Knitting Needles Applied In Circular Loom

KEY WORDS:

Tribology, Wear, Needles, Knitwear.

PAGES: 51
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Têxteis
SUMMARY:

Knitted textile structures are widely used by mankind. Its softness, elasticity, and good fit ensure comfort for those who use it. Its production takes place in machines equipped with a mechanical sliding system, where needles fit into slots (thin slots) and slide over them in an alternating motion, so that it is possible to form loops. This sliding system naturally causes wear on the needles and grooves, which makes it necessary to replace these parts over time. Although wear is directly related to the knitting process, it is difficult to find information in the literature related to the behavior and durability of needles. This work consists of a tribological study of knitting needles, aiming to contribute to a better understanding of the wear mechanism that occurs in this fundamental part for knitting. To analyze the wear on the needle shaft, a mechanical adaptation was made in a machine that simulates wear on fabrics, so that a tribological pair was formed between the needle shaft and an eccentric, of the same model used in circular looms. Needles were separated and subjected to the following tests: 5,000, 10,000 and 15,000 dry cycles, with Silvertex 32B oil lubrication (for looms) and with Silvertex 32B oil lubrication + metal conditioner, at a single speed of 135 cycles per minute. The temperature was monitored by means of a thermocouple fixed near the friction region. The samples will be analyzed by microscope and MEV/EDS imaging to make a comparison of each tribological pair. To analyze the wear on the needle head, a small bench will be set up with the objective of continuously passing yarn below the needle hook, simulating in an accelerated manner the friction the yarn causes on the hook during successive loop formations on a loom. Yarns of different compositions were used and their wear on the hook analyzed by microscope and MEV/EDS images.

BANKING MEMBERS:
Presidente - 3217842 - MARCOS SILVA DE AQUINO
Interno - 2239386 - JOSE IVAN DE MEDEIROS
Externo ao Programa - 2322134 - MOISES VIEIRA DE MELO
Externo à Instituição - ALEXANDRE JOSÉ SOUSA FERREIRA - UFSC