Research Of Physical And Mechanical Indicators Of Jensie And Knitted Fabrics Recommended For Children's Combined Outerwear

The article examines and analyzes the physical and mechanical properties of different proportions of jeans and knitted fabrics recommended for children's combined outerwear. It also offers the most alternative fabric patterns for children's outerwear.


INTRODUCTION
In today's world of clothing, not only the consumer demand or fashion trend, but also the right choice of fabric to suit the product, depending on who and for what purpose, for what season, at the same time, special attention is paid to creating a model that matches the characteristics of the fabric. OCLC -1091588944 processes of production, labor productivity, and product quality. By designing high-quality children's sportswear and correctly approaching the modern economic features of their production, production as a high quality seasonal sewing item.
The practical and scientific design of clothing plays a leading role in solving the problems of the garment industry, because at this stage of design, the social and technical-economic requirements for clothing and its quality must be fully taken into account. Based on these requirements, a new clothing model will be developed. In children's sportswear, first of all, the fabric chosen for sewing clothes should be resistant to the dynamic movements of children, which should serve to improve air circulation in them. In a market economy, the demand for knitwear is growing day by day. One of the main requirements of today is to expand the range of top knitwear for children, given the current technological capabilities. It is known that different types of knitted fabrics are produced: glad, fleece, chain, knitwear, sukno, sharme, and others. Due to the high natural properties of the study -cotton, linen, wool -fibrous fabrics were selected as the preferred fabrics for children's combined clothing, knitwear of different sizes and denim fabric were selected. In order to determine the physical and mechanical properties of knitted fabrics from 10% lycra with 90% cotton fiber, 7% lycra with 93% cotton fiber, 5% lycra with 95% cotton fiber, as well as from 50-60 tex warp and weft yarns, samples with a mass of 282-340 g of 1 m2 of fabric woven in twill weaving were performed on modern equipment installed in the testing laboratory of the Namangan Institute of Engineering and Technology in order to determine the physical and mechanical properties of the selected fabrics.
Sampling of knitted fabrics was carried out in accordance with GOST 8844-75. Using the DW-1111 machine, the samples were cut to 100x100 mm and the weight of the fabric was measured using an ZK-200C electronic vacuum scale (  It is known that denim are made of cotton yarn or yarn mixed with polyester.
Denim fabrics belong to the group of garment fabrics, which are woven from combed yarn and carded yarn spun with a relative linear density of 60 to 100 tex and above, and the mass of 1 m2 of fabric is 250-300 g. will be.
Clothing is in direct contact with the body, and its quality is taken into account in the design of the product.
Therefore, it is necessary to determine the fiber content and physical properties of the fabric.
The air permeability of fabrics is one of the hygienic indicators for children's outerwear, determined by the coefficient indicating the amount of air passing through 1 cm 2 of fabric per second from the pressure difference applied on both sides of the fabric. Air permeability on the device YG-461E in accordance with the standard B (cm 3 /cm 2 sec) GB / 5453 (ISO 9237) for ready-made garments -pressure -100Pa, range size -.08.0 mm under normal conditions tested and determined using the following formula. Here: V -the amount of air passing through the fabric at a given pressure difference Р, cm 3 ;

S -fabric area,cm cm 2 ;
T -is the time taken for the air to pass through the fabric, sec.
The air permeability in the selected knitted fabrics varied from 44,865 cm 3 / cm 2 seс to 58,051 cm3 / cm 2 sec (Fig. 2)   The main quality indicator of fabrics is characterized by tensile strength. In the research work, the breaking force was prepared according to the standard method, the length and width of the samples were 30 x 5 cm, and for 30 minutes using a dynamometer "YG-026T" -454 x 3 (13 N). results were obtained. The results obtained were calculated using the following formula (  In the analysis, the re-deformation (height) of the sample varied from 0.07% to 97.3%. The lowest result was observed in variant-II knitted fabric (Fig. 4).
The relative elongation in the selected jeans fabrics ranged from 10.50% to 38.95%. The lowest relative elongation was found in variant 1 fabric.
In denim fabrics, the lowest air permeability from 3,751 cm 3 / cm 2 *sec to 5,260 cm 3 / cm 2 *sec was observed in the selected variant 1 of Denim fabric ( Table 2).
The relative elongation ranged from 10.50% to 38.95%. The lowest relative elongation was found in variant 1 fabric.
The results show that the knitwear patterns have significantly higher elongation than Denim fabrics and have changed significantly even under the influence of a small force. The results obtained from the selected fabric samples showed that the re-deformation Another factor to consider when choosing a fabric for children's outerwear is the abrasion resistance of the fabric. Fabric samples were tested using the YG401B friction tester. Fabric samples of 100x100 mm were subjected to a load of 9 kPa at a speed of 20-70 rpm and placed at 90,000 cycles. The degree of peeling of fabrics was observed from 859 to 2692 cycles when the equipment was started at a speed of 70 rpm under a load of 9 kPa.
The results show that the highest peeling fabric is in the variant III fabric, low-peeling fabric was observed at 2692 cycles in variant I fabric.
Fabric degradation was the highest in the sample, with 19,332 cycles degraded in variant II fabric. The most durable non-abrasive fabric was observed in these I and V variants. The results are given in Table 3.

CONCLUSION
Research shows that it is very important to choose a suitable fabric for children's outerwear, taking into account not only their aesthetic but also their physical and mechanical properties.