DYES
Chemicals used to color objects are called dyes. is named.Paint creates a scratchable film on the surface of objects, coloring them.
Coloring the objects is a purely physical effect.
Compounds used in the coloring of the textile product and attached to the product by chemical bonds are called dyestuffs.
As a result of dyeing, a chemical bonding occurs between the textile material (fiber, yarn, fabric, etc.) and the dyestuff.
It is not possible for the dyed fiber to acquire its initial colorless state by physical processes such as scraping, wiping, washing.
Objects colored with paint can be discolored by scraping, wiping and washing.
LAfter the yarn is spun as yarn, dyeing it before becoming a woven or knitted fabric is called yarn dyeing.
Fabrics made from dyed yarns “yarn dyed” they are called.
For melange yarn production and carpet yarns fiber dyeing used.
Fiber dyeing is the process of dyeing textile fibers in mass form without any physical treatment.
Fiber dyeing is more common in wool, polyamide and acrylic fibers.
When the cotton material gets wet, it swells and gains a tighter structure, making it difficult for the dye liquor to circulate in the mass. Therefore, such an application is not preferred. However, errors in fiber dyeing or uneven dyeing can be easily corrected during blowroom.
In the wet spinning method, a solution of the polymer in a suitable solvent is prepared. The prepared solution is conveyed to the spinneret head in a coagulation bath under constant pressure with the help of a suitable pump. into the bath where the nozzle head (chemical mixture that solidifies the polymer) is located. coagulation bath It called.
What are impacted teeth?
When one or more teeth fails to grow in the correct position and is therefore held below the normal gum line, it is called an impaction. This can be complete, such as completely unerrupted (buried) third molars (wisdom teeth) or partial when just part of the tooth is visible in the mouth.
Why are impactions important?
For best function and appearance the teeth should grow in a healthy alignment. When one or more teeth is impacted, this can affect the function of that tooth but also the function and appearance of other teeth.
Whether all impactions should be treated is still controversial and your dentist and oral and maxillofacial team can explain the advantages and disadvantages or treatment for you, which is usually surgical.
The reason for this is that the polymer coagulates in this bath. polymer solution; It coagulates and precipitates in the same way as it emerges from thin holes in the form of filaments.
Yarns can be dyed as coils or as hanks. Hank dyeing is the dyeing of wide loosely wound yarns. Hank dyeing is done because very tightly twisted, high-bulk yarns (acrylic yarn created by twisting yarns with different tensions) are difficult to dye in bobbin form..Longer liquor is used in hank dyeing than in bobbin dyeing. There are three types of machines used in hank dyeing. The first type is in the form of a cabinet, the second type is the universal dyeing boiler where the hanks are attached to the hangers, and the third type is the spray hank dyeing machines.
TYPES OF DYES
DIRECT DYES
Textile materials consisting of cotton, wool, viscose, Modal fibers and their blends
DISADVANTAGES OF DIRECT DYEING MATERIALS
1-Wet fastness of direct dyestuffs is moderate.
2-Light fastness is low. However, it is possible to increase light fastness by processing with metal salts after dyeing. Metal salts used to increase fastness are known in the market as fixatives for these dyeings.
3- Some of these dyestuffs have a carcinogenic effect.
Reactive dyestuffs are dyes that dissolve easily in water. It can also be used for dyeing wool, polyamide, silk, fibers other than cellulose-based fibers.
ADVANTAGES OF DIRECT DYES
1-It is cheap.
2-It is easily soluble in water.
3-The painting process is very simple.
4-There is no need for high pH values during dyeing.
5-It has a wide range of colors.
6-Dark colors are available.
Reaction dyestuff:
Textile materials consisting of cotton, viscose, modal, polyamide, polyester fibers and their blends
Cube dyestuff:
Textile materials consisting of synthetic fibers, cotton, wool, linen, silk, viscose, Modal fibers and their blends.
Sulfur dyestuff:
Textile materials consisting of cotton, viscose, modal, linen fibers and their blends.
Development dyestuff:
Textile materials consisting of cotton, viscose, Modal, linen, polyamide fibers and their blends.
Acid dyestuff:
Textile materials consisting of synthetic fibers, wool, silk, fibers and their blends.
Metal complex dyestuff:
Textile materials consisting of wool, polyamide, acrylic fibers and their blends.
Dispersion dyestuff:
Textile materials consisting of synthetic fibers, acetate fibers and their mixtures.
Basic dyestuff:
Textile materials consisting of cotton, viscose, modal, polyacryl fibers.
Pigment dyestuff:
Textile materials consisting of synthetic fibers, especially polyamide, polyester, cotton fibers and their blends.
Optical Whiteners:
Optical brighteners are colorless, organic substances that penetrate fibers and have a fluorescent effect (self-luminous, phosphorescent). They cause a different refraction of light. They act as a dye, not as a whitening agent like oxidizing agents.
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