A study on the needle heating in heavy industrial sewing ‐ Part 1: analytical models

Li, Qinwen; Liasi, Evangelos; Zou, H.J.; Du, Ruxu

doi:10.1108/09556220110390700

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…During the sewing process, a high tensile and heat load of the thread arises that causes deformation of the thread. [2][3][4][5][6][7][8][9][10][11] Deformations are reflected in any structural changes in the thread's twisted fibers and, thereby, changes arise in the mechanical properties. 4 PET multifilament threads for application in the automotive industry have to fulfill high-quality demands regarding strength, elasticity, and friction properties.…”

Section: Introductionmentioning

confidence: 99%

The effect of heat treatment conditions using the drawing process on the properties of PET filament sewing thread

Rudolf

Geršak

Smole

2011

Textile Research Journal

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For the production of drawn poly(ethylene terephthalate) (PET) filament threads it is useful to determine the relationship between the drawing process conditions and the resulting product properties. Drawing at an elevated temperature over a defined time usually causes changes of the polymer structural parameters that influence the mechanical properties of the filaments. In order to elucidate the physical background of the drawing process for developing the production process of PET filament sewing thread, the thread was drawn by varying the treatment temperature and contact time. The effect of the treatment conditions on the structural and mechanical properties of the drawn threads was investigated, such as the birefringence, crystallinity, and dynamic mechanical properties of the threads’ filaments, as well as the mechanical properties and shrinkage of the treated threads. Using the drawing process, higher temperature and contact time up to the critical values ( T2 = 220°C, n2 = 9 turns) change the structural parameters and, consequently, any modifications influence changes in the mechanical properties of the threads. Namely, a higher treatment temperature and contact time increases the degree of crystallinity, the birefringence, and the maxima of the loss tangent and loss modulus temperature, and a significant increase in the breaking tenacity, elastic modulus and the thread’s tension at the yield point, and a decrease of the breaking extension is achieved. The observed deterioration of the thread’s mechanical properties above the critical treatment conditions is attributed to the destructive phenomena of the supra-molecular structure, resulting in an imperfect structure of the thread’s filaments.

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Section: Introductionmentioning

confidence: 99%

The effect of heat treatment conditions using the drawing process on the properties of PET filament sewing thread

Rudolf

Geršak

Smole

2011

Textile Research Journal

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“…. In this model, it is approximated that the friction heat is given as Q ¼ F.v, 1 where F is friction force and v is the relative velocity of the rubbing surfaces.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Depending on the sewing conditions, maximum needle temperatures range from 100 C to 300 C. 1 This high temperature weakens the thread, since thread tensile strength is also a function of temperature, 1 resulting in decreased production. 2 In addition, the final stitched thread has 30-40% less strength than the parent threads.…”

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confidence: 99%

Prediction of needle heating in an industrial sewing machine

Mazari

Bal

Havelka

2015

Textile Research Journal

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In industrial sewing, needle heating is a key problem that limits the further increase of sewing speed, and hence the productivity. Heat is generated during the sewing process because of friction between the needle and the sewing thread as well as between the needle and the fabric. The high temperature of the needle affects the quality and productivity of the sewing. The problem of needle temperature rise due to friction heat generation is considered in this paper and a simple analytical model is developed to predict needle temperature. The predicted needle temperature is compared with the experimental results by the inserted thermocouple method. Some of the process parameters, used as input variables, were also measured experimentally and experimentally observed values of needle temperature were compared with the theoretical prediction. It was observed that the temperature of the needle increases significantly with the presence of the sewing thread. Both the theory and the experimental results show that the needle temperature increases linearly with the machine speed within the ranges studied.

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“…Sewing speed is one of the main factors in the needle heating, but other factors also contribute, such as sewing needle design, coating, material sewn, thread tension, thread lubricants and fabric finishing. Due to these factors, the temperature of needle can change from 100 o C~300 o C during the sewing operation depending on the sewing conditions [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Analysing The Effects of Knitted Fabrics Physical Properties to The Heating of Sewing Machine Needles

Akçagün

Yılmaz

Kayar

2023

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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Due to the increasing demand in the clothing industry, industrial sewing machines operate at high speeds ranging from 2000 to 3000 revolutions per minute. One of the most significant problems that adversely affect the stitching quality and efficiency is the needle temperature, which reaches up to 300 oC and is influenced by various parameters such as machine speed, thread tension, and fabric properties. In this study, the heat generated from the friction between the needle and the textile surface in knitted fabrics and the fabric properties affecting heat are examined. Four different knitting techniques and twelve different knitted fabrics with varying weights, thicknesses, and blend properties were used. An Optris CT3M pyrometer was employed to measure the temperature on the needle. The results can be summarized as follows: in all knitted fabrics, an increase in fabric weight and thickness was observed to correspond to an increase in needle temperature values. The highest needle temperature values above 90 oC were obtained in TF2-coded three-thread fleece fabric with a fabric thickness of 1.31 mm and a fabric weight of 340 g/m2, while the lowest needle temperatures of 66 oC and below were achieved in the lightest and thinnest fabric with a fabric weight of 100 g/m2 and a thickness of 0.39 mm. Additionally, no significant relationship was found between fabric stitching density and needle temperature.

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A study on the needle heating in heavy industrial sewing ‐ Part 1: analytical models

Cited by 13 publications

References 8 publications

The effect of heat treatment conditions using the drawing process on the properties of PET filament sewing thread

The effect of heat treatment conditions using the drawing process on the properties of PET filament sewing thread

Prediction of needle heating in an industrial sewing machine

Analysing The Effects of Knitted Fabrics Physical Properties to The Heating of Sewing Machine Needles

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