By Dr. Charles Tomasino
Monograph written for college kids of the cloth undefined, facing the chemistry and applied sciences of yarn and upholstery dyeing and completing.
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Chemical engineering is the department of engineering that offers with the applying of actual technological know-how, and existence sciences with arithmetic, to the method of changing uncooked fabrics or chemical substances into extra invaluable or useful kinds. This booklet reports examine regarding chemical undefined, chemical engineering and different attached components.
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4. Test for Starch A drop of iodine solution placed on a test specimen resulting in a characteristic blue color is t h e universal test for identifying starch. It can be used as a qualitatively test to show whether all the starch was removed. Absence of the blue color signifies t h a t all the starch has been removed. The intensity of the color is some what related to how much is left. Usually, if the color is faintly perceptible, the remaining starch will come out in the scouring and bleaching steps t h a t follow.
FABRIC PREPARATION A. W a r p S i z e and D e s i z i n g For woven fabrics, warp size constitutes the major impurity that must be removed in fabric preparation. This section introduces the materials often used as warp sizes a n d the chemistry needed to remove them. 1. Sources of S i z i n g Compounds The following list summarizes the materials that can be used as warp sizes. Some of the base materials a r e used either alone or as additives to impart desirable properties to other bases. When designing the desizing step, it is important to know what base size was used.
The schematic in figure 21 shows the process flow for the recovered materials. The recovery unit is usually found at the dye house so the hot water can be recycled into the normal flow of desizing. The recovered size however must be returned to the weaving mill. Seldom are weaving mills a n d dye houses located near each other so a n added concern is transporting the concentrated size solution back to t h e weaving mill. Tanker trucks are used for this purpose. Figure 16. PVA Size Recovery Ultrafiltration Unit 27 PVA Reclamation Schematics VI.
Chemistry & Technology of Fabric Preparation & Finishing by Dr. Charles Tomasino