(2) squeezing fabric bleaching after washing the fabric with more water, Garden Flags Companies rolling as far as possible before drying to remove moisture to improve the efficiency of the drying machine, saving steam. Water rolling machines commonly used vertical padder type of padder with two roll and three roll with the requirements in accordance with the rolling water. The roll of iron or steel, hard roll and the soft roll of soft rubber, paper meal system. Advertising Feather Flags The rolling water should control the liquid evenly rolled and rolled I rate, heavy cars rolling rolling I rate of 60% or less, generally rolled the car rolled I was 75%.
(3) drying the drying cylinder drying machine to the application of 2 to 3 column vertical drying cylinder drying machine is the most widely used, the drying cylinders in each column for 8 to 10. Garden Flags Companies Drying fabric pH value should be close to neutral, to avoid brittle fabric drying, otherwise should be re-washed before drying.
Above pre-treatment process is used for many years, pre-treatment process at home and abroad towards the efficient, high-speed, short flow direction. At present, many will retire, boiled drift three-step desizing, scouring a bath or broiled drift a bath two-step instead. Will retire by the use of efficient additives, boiling, bleaching merged into a bath one step has been successful in the polyester-cotton blend fabric, cotton fabric with a bath one step of progress. Back, boiling, Garden Flags Companies bleaching bath one step to greatly shorten the process, reduce the unit machine number, less total plant area, you can also save energy, improve labor productivity, thereby reducing the cost of pre-treatment, Advertising Feather Flags And Banners is a noteworthy and in-depth study of new technology.
6. Mercerized cotton fiber impregnated with concentrated caustic soda solution, the irreversible severe swelling of the cotton fiber, the fiber cross-section by the flat kidney-shaped into a circle, Custom Swooper Flags Wholesale on cell contraction, longitudinal natural distortions disappear, shorten the length. Baptist concentrated alkali to apply tension to the fiber, the fiber contraction, the fiber surface wrinkles disappear, to be very smooth cylinder, showing a sheen of light reflect. Fiber on alkali washing to remove the tension persists, you can basically retained the morphology in the cotton fiber swelling, irreversible swelling at this time to obtain more long-lasting luster. Caustic soda can enter inside the cotton fibers, Teardrop Flags And Banners so that part of the crystalline region into the amorphous region of the alkali and, after washing the situation has been largely preserved, the adsorption properties of cotton fiber is greatly increased.Garden Flags Companies
Suffered tension different cotton fabrics impregnated with concentrated alkali, there are two conditions, First dip in latitude and longitude to exert tension conditions rolling lye fabric is no longer shrink after washing the alkali, such as fabric can get the luster of silk fabrics, known as mercerization, generally contain cotton fiber fabric is mostly mercerized; another fabric in tension-free impregnated with concentrated caustic soda solution, then the fabric stacked state of relaxation, left to its own contraction. allows fabric to become close, flexible, called alkali shrink, used for the processing of cotton knitted jersey.
Cotton and blended fabric after mercerization, Garden Flags Companies cotton fiber on the supramolecular structure and morphology changes, in addition to the improvement of gloss, and chemical reactivity, increased dye absorption capacity, the fabric size is also more stable, strong, extensibility and so an increase.
Cotton blended fabric, in addition to cotton fiber, caustic soda, Garden Flags Companies polyester, polyvinyl alcohol, etc. are not generated mercerizing role, and these fibers are more sensitive to concentrated caustic soda solution, which the cotton-type fabric mercerizing should be appropriate to adjust the process conditions to make polyester, polyvinyl alcohol etc. will not be damaged. Cotton mercerized to arrange for pre-treatment of the last process, namely, desizing, scouring, bleaching after this mercerized better, but vulnerable to lye without a net impact of fabric whiteness somewhat less for the bleached mercerized fabric mercerized before and after bleaching or mercerized after bleaching. For some staining dye faster, likely to cause uneven staining of the species, can also be used after the first dyeing, mercerizing.
In addition to the caustic soda can be used as mercerizing agent, some chemicals such as concentrated sulfuric acid, concentrated zinc chloride, zinc and sodium also can make the cotton fiber swelling, and thus similar to the effect of caustic soda mercerized, but difficult to achieve with caustic soda mercerized the extent of the actual production difficulties, these chemicals are not inexpensive, such as caustic soda, a wide source, except for the occasional lack of practical value such as concentrated sulfuric acid mercerization. It is worth mentioning is the handling of liquid ammonia for cotton, with certain characteristics, physical and mechanical properties of treated fabric strength, abrasion resistance, crease-resistant, flexible, feel has been greatly improved. The liquid ammonia treatment requires special equipment, investment, recycling of waste ammonia is more difficult to be widely used in industry, further efforts were needed.