Silk continuous

The color change, shown in Figure 12 as CIELAB AE, reached a maximum of 5 units after a 50 kj (340 nm) exposure and remained constant on further exposure. Parylene-C coated silk continued to yellow out to an exposure of 242 kj (340 nm). ... 

Traditional rearing of silkworms has been in practice in the country for centuries as silk continues to remain a sought-after commodity from India. The Department of Biotechnology has been supporting a number of projects in mulberry and non-mulberry sericulture. A few important features of such efforts are briefly described below. 

Silk continued to be one of the most common materials used until the development of synthetic materials, and the term "silk screening" is still commonly used to describe the screen-printing process. The development of S5mthetic fibers, such as nylon, made possible greater control of the mesh materials, and the added development of photosensitive materials used for creating the patterns allowed screen printing to become much more precise, repeatable, and controllable [8]. 

Some types of built-up mica are bound to special paper (qv), silk (qv), linen, muslin, glass cloth, or plastic. These products are very flexible and are produced in continuous wide sheets. These sheets are either shipped in roUs or cut into ribbons, tapes, or other desired shapes (Table 7). 

For the remainder of 1934 and throughout 1935, Carothers team continued to hunt for fibers. They focused on compounds related to Coffman s exciting polyamide filament. It was stronger than silk but Carothers was looking for filaments that were easier to polymerize and spin. Bolton, on the other hand, urged Carothers to focus on polymers made from cheap and plentiful materials. 

The first fibers used by humans were probably those that occur naturally as tissues or excretions of either vegetables or animals (see Table 87). At much later times, after metals had been discovered, humans also learned to manufacture - from some of the ductile metals, mainly gold, silver, and their alloys - thin filaments (not fibers, however), which have since been used to decorate textile fabrics. It was only during the twentieth century, after synthetic plastics were discovered, that it became possible to make artificial human made fibers. The great majority of the natural fibers, such as cotton and wool, occur as staple fibers, short fibers whose length is measured in centimeters. Silk is different from all other natural fibers in that it occurs as extremely long and continuous filaments several hundred meters long. 

Alternative wind models assume a selective outflow of enriched material, either taking place at the time of star formation bursts in dwarf galaxies (Matteucci Tosi 1985) or taking place continuously from the hot component of the ISM which is also assumed to be metal-enriched (Vader 1987 Ferreras, Scannapieco Silk 2002). An analytical model by Lynden-Bell (1992) supposes that, of the return fraction 1 — a from a generation of stars, a fraction 1 — / escapes, leading via Eq. (7.34) to... 

More akin to silk yarns, continuous filament POY produces lighter fabrics, typically of 100 % PET. Such yarns have provided a fertile field for imaginative engineering of cross-sectional shapes, fiber sizes and combinations of color and texture. An entire field of specialty filament yarns known as Shingosen has been developed in Japan, providing novel and luxurious fabrics that cannot be duplicated with natural fibers. 

DuPont continued their leadership role in synthetic fibers by commercializing acrylic fibers (Orion) in 1950. They did a repeat performance in 1-953 with a polyester called Dacron. The big four fibers—Nylon 6, Nylon 66, acrylics, and polyester—now account for most of the synthetic production and about half of the fiber production of all kinds, including cotton, silk, and wool. 

Although fibers can be classified in numerous ways, in terms of present-day technology, they are fundamentally classified as(l) natural libers, and (2) synthetic libers. The principal natural fibers are cotton, wool. and. to a much lesser extent, silk. liax. and mohair. Synthetic tihers have made inroads into the use of all natural fibers, bul the greatest impact has occurred in connection with the latter three libers. Cotton continues to be a major textile fiber, measured in terms of billions of pounds used per year. Colton is one of the most versalile of all libers and blends well with synthetics. This is also true of wool, bul lo a somewhat lesser extent. Synthetic Fibers. Introduced in 1910 as a substitute for silk, rayon was the first artificial or synthetic fiber. Rayon, of course, differs completely in chemical constitution from silk. Rayon typifies most reconstituted or synthetic fibers, which perform almost as well and. in a number of respects, far better than their natural counterparts Some of the more recently developed synthetic libers have lilile if any resemblance to naturally available fibers and thus enlirely new types of end-producls with previously unobtainable end-qualities are available,... 

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