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- ItemCUTTING ROOM SOFTWARE: ENHANCING EFFICIENCY IN GARMENT PRODUCTION(Technical University of Liberec, ) Arsoy, Raşit; Technická univerzita v LiberciThe rapid growth of the ready-to-wear industry has created a need for continuous improvement, along with the necessity to shorten production times and increase quality. The processes in this industry comprise a series of sequential activities carried out by machines and workers in a specific order. Particularly before cutting, checking model information is critically important. However, the various document formats used in the industry and the software employed to manage this data can complicate the work for personnel. In this context, there is a need for user-friendly software to enhance operational efficiency and minimize errors. This research aims to develop software focused on cutting processes. The developed software allows users to quickly and effectively access model and fabric information, measurement charts, and warehouse data, while simplifying complex processes. Additionally, its simple interface enables use without the need for special training and allows for the remote management of processes. As a result, the software aims to increase operational efficiency while reducing errors and workload.
- ItemNUMERICAL SIMULATIONS OF 3D-DISTANCE FABRICS(Technical University of Liberec, ) Votrubec, Vlastimil; Technická univerzita v LiberciThis paper presents the results of numerical simulations conducted on inflated panels made from 3D distance fabrics. 3D distance fabrics constitute a subset of 3D woven fabrics. If coated, the structure of the fabric permits the formation of a panel with parallel layers through the process of air inflation. The pressurised air creates a stiff, lightweight and fail-safe structure that can be utilised in a multitude of applications. The mechanical behaviour of these panels can be described analytically by appropriate mathematical theory; however, this approach remains limited to common loading cases. This paper presents computational method for numerical simulations of inflated panels, including determination of the deflections of skins and the distribution of stress. The simulations are based on the results of material property tests and a nonlinear geometric model. The results are then compared with the mathematical theory and experimental data. The results demonstrate the efficacy of this approach and illustrate its advantages. Furthermore, an illustrative example of a specific loading case is presented to demonstrate the versatility of this approach for predicting the behaviour and conducting structural analysis of loaded 3D fabric panels.
- ItemDESIGN OF ELECTRICALLY CONDUCTIVE, HIGHLY STRETCHABLE, HYGIENIC ELECTRODES FOR ELECTROTHERAPY(Technical University of Liberec, ) Ali, Azam; Militky, Jiri; Tomkova, Blanka; Wiener, Jakub; Technická univerzita v LiberciThe main objective of this study was to create versatile and wearable electrically conductive electrodes for Transcutaneous Electrical Nerve Stimulation (TENS) application, ensuring they are comfortable by depositing silver particles directly onto the carbon particles imparted rubber electrodes. Scanning Electron Microscopy (SEM) was used to analyze the shape of the deposited silver particles. To enhance the electrode's performance during body movements, the conductive fabrics were stretched repeatedly, and changes in resistivity were observed. The electrical resistance showed minimal variation with small extensions, remaining relatively constant between 0–75% stretch. Resistance increased significantly after 80% stretch, but the fabric's resistivity remained stable even after over 100 stretching cycles. Additionally, there was no significant change in resistivity over time at a constant current. The study also investigated the antibacterial properties of the deposited particles against bacteria like Staphylococcus aureus and Escherichia coli. The antifungal activity assessment using Aspergillus fumigatus further underscores the benefits of the silver-plated elastomers in combating fungal growth. Finally, the durability of the coated fabrics concerning comfort and electrical properties was evaluated through multiple pressure applied, showing good particle retention and only a slight decrease in conductivity.
- ItemINVESTIGATION OF THE PRODUCTION OF TRICLOSAN/CHITOSAN NANOCAPSULES FOR FUNCTIONAL SURFACE APPLICATIONS(Technical University of Liberec, ) Dasdemir, Mehmet; Serdar, Serap Gamze; Ibili, Hatice; Technická univerzita v LiberciThis study focuses on producing monodisperse nanocapsules with a triclosan/chitosan core-shell structure using the coaxial electrospray method. The coaxial electrospraying method enables the production of core/shell structured nanocapsules in a single step. The effects of flow rate, core-to-shell flow rate ratio, and needle size on the coaxial electrospray process were systematically analyzed. The resulting nanocapsule structures were characterized using scanning electron microscope (SEM), transmission electron microscope (TEM) and size measurements. The experiments demonstrated that fibrillation more likely occurred when the chitosan content was highest.
- ItemEVALUATING BIODEGRADATION RATES IN NEAT PCL- AND PCL/PLA-BASED BIOCOMPATIBLE TUBULAR SCAFFOLDS(Technical University of Liberec, ) Oztemur, Janset; Ozdemir, Suzan; Tezcan-Unlu, Havva; Cecener, Gulsah; Sezgin, Hande; Yalcin-Enis, Ipek; Technická univerzita v LiberciVascular grafts are synthetic tubular structures that play an important role in replacing damaged vessels in the treatment of cardiovascular diseases. Existing grafts, especially in small-diameter vessels, face persistent issues such as thrombosis, immune rejection, and mechanical limitations. Vascular grafts designed with an innovative perspective to overcome these deficiencies are tubular scaffolds with a biodegradable structure and a layered design that mimics the native artery structure. This study focuses on the development of biodegradable and biocompatible tubular scaffolds with randomly distributed and radially oriented fibers in different layers to replicate the native structure of artery, utilizing neat polycaprolactone (PCL) and PCL/polylactic acid (PLA) blend with 4/1 polymer blend ratio. Electrospinning technique is employed to fabricate tubular fibrous structures. The biodegradation profiles of these scaffolds are assessed at 3, 6, and 9 months, with comparative analyses conducted to explore how polymer type and orientation level influence degradation rates and the structural integrity of the materials over time. The findings reveal that scaffolds with randomly distributed fibers exhibit higher biodegradation rates compared to those with oriented fibers, particularly in the PCL/PLA blends. Specifically, the study identifies PCL_R as having the highest degradation rate at 61% weight loss by the 9th month. Importantly, while PCL is known for its slow degradation, the high molecular weight of PLA leads to a slower degradation profile in the PCL/PLA samples. These insights underscore the critical role of scaffold morphology and composition in optimizing the performance and functionality of vascular grafts, highlighting the need for scaffolds that support cellular activities while effectively degrading to facilitate tissue regeneration without toxic effects.