Either way, the process are soaking → in → padding acid → Where Can I Buy Decorative Flags to deacidification → baking → rolled carbon and water washing → drying. Wind Flags Wholesale
Wool fabrics after full succinct than the white, generally dyed fabrics can be directly stained, no longer have been bleached. Whiteness requires high white fabric bleaching.
The wool has a natural light yellow, natural pigments in wool, available hydrogen peroxide oxidation and bleaching can also be used reducing agent bleaching can also be oxidized after reductive bleaching. White or light colored products whitening processing.
(1) oxidative bleaching oxidation using oxidants, pigment destruction of the wool, so that the color disappeared. This bleaching method is characterized by whiteness lasting, not yellowed, but the wool is easy to damage. This solid must be strict control of process conditions, to prevent excessive oxidation, resulting in stubby, powerful decline, oxidative bleaching can not use sodium hypochlorite, wool fibers will turn yellow, brittle damage. Advertising Feather Flags And Banners Oxidative bleaching agent is hydrogen peroxide. Reference process prescription as follows:
Hydrogen peroxide (35%)
Sodium silicate (relative density 1.4)
2 reduction of reductive bleaching using a reducing agent to restore the pigment in the wool, so that the color disappeared. This bleaching method is characterized by damage to wool, but whiteness unstable for a long time and exposed to the air, susceptible to air oxidation and yellowing. The wool industry reduction bleach hair bleaching powder, which is composed of 60% low-sodium sulfite and 40% sodium pyrophosphate mixed. Custom Outdoor Banner Flags
3 The first oxidative and reductive bleaching bleaching method, Where Can I Buy Decorative Flags also known as dual-drift. Double bleaching process also has the advantage of oxidative bleaching and reductive bleaching, gloss white, bleached and lasting effect, and feel good fabrics, loss of strength. Sports Team Feather Flags
4 whitening wool products after oxidation or reductive bleaching, often with yellow, so you can at the same time in the bleaching process of whitening. Run mesh the whitening bleached fabric is more white. The wool fabric used brightener for fluorescent whitening agent VBL, brighteners WG, and so on.
(B), the pre-treatment of silk fabrics
Silk is a natural protein fiber sub-varieties of the silkworm, silk, silk, silk, castor silk and cassava silk. Contains a lot of sericin impurities in raw silk and its fabrics (called Pichou), most of which are fiber materials inherent sericin (about 20% to 30%) and oil wax, ash, pigments. In addition there are in the silk with slurry, in order to Where Can I Buy Decorative Flags identify twist stained with a variety of oil to the applied coloring dyes and operation, Personalized Advertising Flags during transport. The existence of these natural and man-made impurities, not only detrimental to the inherent fine quality silk fabrics, the impact of taking the value, but the fabric is difficult to be the solution wetting and penetration of dyes hinder the dyeing and finishing. In addition to the special varieties of raw silk and its fabrics must be concise processing to remove impurities and thus for processing qualified semi-finished or directly from Where Can I Buy Decorative Flags the practice of white products, this process is called scouring. Silk fabric scouring the main purpose is to remove the sericin, sericin removal of impurities attached to the sericin also be removed. Therefore, the scouring of silk fabrics, also known as degumming.
A. The principle of degumming Outdoor Banner Flags
The silk is mainly composed of silk fibroin and sericin, which are proteins, the basic constituent units are α-amino acids with hydrophilic and gender nature. However, due to the type of amino acid composition, and varying concentrations sericin and silk fibroin molecular structure and morphology has a great difference. Sericin contained in the hydroxy Where Can I Buy Decorative Flags amino acid (serine, threonine), the number of acidic amino acids (aspartic acid, glutamic acid) and basic amino acids (soft acid, arginine) than the silk fibroin, These amino acids with a polar hydrophilic groups, so that the the sericin points arranged in disordered Custom Advertising Feather Flags loose spherical particles. Silk fibroin protein, significant fibrosis, the molecular chain close to each other to form a crystalline entire column region.
Sericin and fibroin in the differences in the composition and structure, resulting in two different in nature: sericin in water, especially near the boiling temperature of water puffed, dissolved fibroin Where Can I Buy Decorative Flags insoluble in water. Appropriate additives such as acids, alkalis, and enzymes exist sericin easier decomposition of silk fibroin showed considerable stability. Silk fabric scouring, in essence, is the use of silk fibroin and sericin these structural differences and different characteristics to the stability of the chemicals, the role of other additives, to remove the sericin and other impurities, in order to obtain than the gloss, soft, pure whiteness, permeability good product. The use of acids, bases, enzymes for processing, were able to achieve degumming purposes.
Two. Commonly used in degumming equipment and methods
Mulberry silk fabric degumming equipment currently used are: scouring trough, half-amplitude continuous scouring machine, star frame scouring. Scouring trough technology is mature, is still the vast majority of manufacturers processing equipment.
(A) scouring trough structure and scouring
Scouring trough is made of stainless steel plate, rectangular bucket, easy to set aside the hanging rod, along the mouth of the notch there is a wide width of the fabric width is generally about
Common practice slot overflow practice slot
Scouring bath flow direction diagram in Figure 1-9
Common scouring tank capacity
Requirements in accordance with the process operation the, scouring slot arrangement is generally 7 to 9 vertical at the top of the scouring trough equipped with electric cranes to lift the fabric and move the fabric to the next tank. Scouring trough a simple structure, convenient operation compared to the manufacturers is still used. Where Can I Buy Decorative Flags
Common methods of scouring trough the degumming of silk fabrics as the main equipment for processing a soda soap, synthetic detergent, alkali and enzyme retting method.
The ① soap an alkali soap soda soap as a scouring agent, and add the amount of soda ash, trisodium phosphate, sodium silicate, alkaline agent to help practicing agent. In order to remove the pigment, and improve the whiteness of the fabric, but also use a small amount of sodium hydrosulfite or hydrogen peroxide as a bleaching agent. Using soap – alkali refining of silk fabrics, feel good and has a soft sheen. Soap – soda process include: concise preparation → pretreatment → beginners → post-processing complex practice → practice.
Pretreatment is generally 0.5 to