Communications in Development and Assembling of Textile Products

The use of phosphorescence micromaterials for commercial textile products

Boris Mahltig, Clara Heil, Sarah Kaub, Jaydip Nareshbhai Kapadiya — Mon, 01 Jan 2024 00:00:00 +0100

Fluorescent textile products are manifold used. Compared to fluorescent textiles, phosphorescent textile products exhibit an afterglow effect even after the illumination is stopped. Phosphorescent textiles are less present as commercial products on the market. With this background the aim of the actual presentation is to investigate the properties of commercially available phosphorescent textile materials. Investigations are performed by illumination under different light arrangement. Microscopy is performed by scanning electronic microscopy (SEM) and advanced light microscopy using UV light. Light emission of the samples is recorded by fluorescence spectroscopy. The chemical composition is determined by using electron dispersive spectroscopy (EDS). Depending on the type of sample, an afterglow effect can be determined up to 5 to 30 minutes after stopping the illumination with UV light. By SEM and EDS methods it is observed that the phosphorescent effects are realized by application of phosphorescent pigments, which can be best described as phosphorescent micromaterials. Depending on the product category, two different types of phosphorescent materials are used – doped strontium aluminates (SrAl₂O₄) and zinc sulfide (ZnS). Products based on doped strontium aluminates exhibit longer afterglow effects compared to products with ZnS pigments. However, the use of doped strontium aluminate is quite surprising for a commercial textile product, because of cost reasons. Finally, it can be stated that phosphorescent micromaterials are established materials for realization of functional textile products. These micromaterials can be found in every day products and are examples for innovative particle technology used in commercial consumer products.

Evaluation and optimization of textile ultrasonic welds for textile temperature control elements using transient thermal numerical analysis

Alexander Reich, Yordan Kyosev, Hassan Saeed — Sun, 07 Apr 2024 00:00:00 +0200

Ultrasonic welding is an efficient method of joining thermoplastic fabrics or other textile semi-finished products in a watertight manner. It is applied in the making of functional clothing, such as chemical protective clothing, sportswear or smart clothing, or other technical products. Another special field of application developed at the Chair of Development and Assembly of Textile Products is the use of coated textiles as temperature control elements. For this type of product, it is necessary to design the ultrasonic welds in such a way that the media-tight coating is not damaged and the joint is continuous. This paper presents the option of evaluating and optimizing the ultrasonic welding process for the production of the textile tempering systems using transient thermal analysis in order to improve the overall quality of the seam and ensure media tightness along the seam.

In the following article, the status of the welding process, in particular the ultrasonic process, the textile materials, the heating of the textile and the joining process of welding is presented. In addition, the transient heat flow through the textile is investigated with the aid of FEM methods; taking into account, various seam structures.

Overview on natural dyes and their IR-spectra – Part I: Plant based dyes with naphthoquinone and anthraquinone structure

Boris Mahltig — Sun, 07 Apr 2024 00:00:00 +0200

This is the first paper of a series of review articles reporting on natural dyes, their origin and infrared spectra (IR spectra). One aim of this review series is to compare IR spectra of natural dyes from different origin and discuss if this spectroscopic method can be used as versatile tool for the identification of natural dyes and their origin. This part I of the review series is related to four natural dyes based on the chemical structures of naphthoquinone and anthraquinone. Especially discussed are Lawson, juglone and alizarin, which are related to the natural products henna, walnut hull and madder root. Also, the natural dye based on alkanna root is investigated. Compared are the IR spectra of these natural dyes gained from different suppliers with the IR spectra of the pure chemical substances related to the natural dyes. A discussion with spectra from literature is supported. The aim of this review paper is to support infrared spectroscopic data of natural materials (natural dyes) to enable further material identification and also quality control supporting people working in the fields of fiber analytics or with production processes using natural dyes

Digitalization in logistics for textiles – possible fields of application for the Blockchain technology

Natalie Fohrer, Andreas Gade, Markus Muschkiet — Sun, 07 Apr 2024 00:00:00 +0200

The globalized supply chains of textiles and clothes involve multiple parties from different countries. Flows of goods, information and finances are coordinated through logistic processes, but offer potential for optimization in terms of digitalization and transparency. Incidents of the past prove that fundamental human rights standards and occupational safety are not met in global production countries yet. Legal regulations like the Act on Corporate Due Diligence Obligations for the Prevention of Human Rights Violations in Supply Chains (LkSG) shall help to improve the situation since 2023. Especially small and medium sized enterprises (SME) in Germany, to which the law applies indirectly through private-sector contracts from their non-SME consignees, struggle to control their global supply chain, to provide all necessary data and to ensure a traceable, fraud-resistant and manageable flow of information. Hence, the Center Textile Logistics investigated the potential of the Blockchain technology and its application possibilities for textile supply chains. The Blockchain technology offer chances in terms of securing clothing trademarks, proofing that standards of seals and certificates are met, proofing that political and legal regulations are met and in terms of controlling global processes that involve international suppliers and partners. However, the current state of the art of digitalization is often too low to directly apply the Blockchain technology and has to be improved first. The cost-benefit ratio has to be evaluated individually but the Blockchain technology offers great potential to rise transparency, ease communication and critical data exchange along textile supply chains.

Development of a transdisciplinary education concept to prepare textile technology students for dealing with AI

Lennart Hellweg, Johanna Bulthaupt, Alen Tabakovic, Mathias Beer — Sun, 07 Apr 2024 00:00:00 +0200

A basic understanding of the mechanisms and implications of the use of Artificial intelligence (AI) is crucial to effectively implement AI in business and society. To achieve this goal, the research project described here aims to provide students from different disciplines with practical AI knowledge. Instead of focusing on traditional teaching approaches, students work together on transdisciplinary and interdisciplinary projects. The basis here is provided by department-specific application scenarios. Supported by learning nuggets, expert lectures and an accessible software infrastructure, students thus gain easy access to AI topics.
The goal in the Faculty of Textile and Clothing Technology is to train specialists in the use of AI in the textile process chain. Students will learn how to classify image data of fibers based on a practical example. Among other things, they will generate a data set for a neural network and work closely with computer science students to implement it. The focus is on enabling students to apply AI independently and thus create the basis for new innovative ideas in industry