I believe that we have encountered many problems when doing textile silicone oil soft finishing, such as yellowing, fluorescence degradation, temperature problems and so on, which are often ignored by some printing and dyeing factories because of various reasons such as cost. How on earth can we solve these problems that can not be ignored?Xinjia Xiaobian I sorted out the most common problem solutions for you, as follows: 

    01, alkaline problems

    Cotton fabric pretreatment usually with a higher concentration of alkali treatment to remove fabric impurities (especially the amount of mercerizing alkali is larger), alkali into the fiber is not easy to wash, dyeing (reactive reductive dye) also want to add alkali, so after finishing cloth surface may be alkaline.And the chemical fiber fabric in the completion of dyeing after reduction cleaning, the current printing and dyeing factory is still using insurance powder and caustic soda cleaning, if the back cleaning is not clean, will also cause soft cloth with alkali.And ordinary silicone oil is not alkali resistant, under alkaline conditions will demulsification, which is the reason why the factory in the soft dip rolling through thousands of meters after the sticky roller.Therefore, before the soft cloth surface must be washed alkali agent or acetic acid in the working liquid, keep the rolling groove PH5-6.

    02, condensation problem

    On contain short fiber fabric (cotton, T/R fabric, velvet class), inevitably there will be some in the process of machining staple fell off, cloth fell from the staple accumulated in the groove, and common cohesive silicone oil, as the finishing liquid uplink to roll, and squeezed the silicone oil emulsion breaking the stick together, forming roll coating or silicone.When the water quality is poor, it will condense with ordinary silicone oil to produce sticky roller. In addition, there will be a similar situation of lint fabric. Do a good job of cleaning before driving, and find that the flower hair can be cleaned at any time.

    03, charge stability problem

    Cotton dyes, whitening agents are mostly anionic, and cotton whitening is basically completed in the setting machine.Additional dyeing cloth when light is wrong need to fine tune the color, repairing color usually when the soft finishing agent on the additional small dye or paint, and factories use normal general silicone oil (weak cationic) will produce charge attract reaction of Yin and Yang, cause condensation and sticky roller, and anion silicone oil feel softness and can not meet the requirements, cause confusion of the factory.Charge consistency must be taken into account in processing.

    04, the temperature problem

    Cotton long car dyeing the cloth through drying drum drying, large package or heap in cloth box, if not fully cooling, especially in large volumes cloth, in the soft fabric surface temperature may be higher, the cause of groove working liquid temperature (especially in summer), sometimes to 60 ℃ above, and ordinary silicone oil can cause sticking when heat resistance is not good.The temperature in the groove is not more than 40 ℃ as well.

    05, finalize the speed problem

    Factory in some thin fabric, finalize the speed is very fast, sometimes can reach 60 meters/minutes of the speed, ordinary silicone oil due to poor permeability, resulting in silicone oil on the roller backflow, resulting in sticky roller.Pay attention to the replacement of the working liquid in the rolling groove, and often wipe the roll.

06, stick to the cylinder problem

    Many factories in the soft impregnation, ordinary silicone oil will stick to the cylinder wall, for a long time, the cylinder wall will form some black oil spots, stained to the cloth surface to form silicone oil spots.Strengthen cleaning work

    07, hand feeling problem

    Because now on the market to fabric feel requirements are higher and higher, and all kinds of fabrics due to different seasons, customer requirements are different, need to show a variety of different style requirements, there are requirements for smooth drape, smooth and flexible, fluffy soft, simple elastic and so on.A kind of silicone oil can generally only reflect one style.Therefore, many factories need to use many kinds of silicone oil, resulting in chaotic production. Sometimes, they can't find the silicone oil suitable for customers, so they have to give up their business and cause losses.We can choose different amino-silicone oil end groups with different ammonia values to control the molecular weight and molecular distribution to synthesize amino-silicone oil with different ammonia values, viscosity and reaction to meet the requirements of various fibers to be soft and smooth elasticity.

    08, the cost problem

    At present, the biggest problem of the printing and dyeing factory is the cost problem. Because the price of water, electricity and steam is rising, and the printing and dyeing processing fee is reduced, causing many printing and dyeing factories are busy for a year, but the profit is basically no, so the cost control is the problem to be solved by the printing and dyeing factory.The finishing agent cost is a major part of the printing and dyeing factory, so the finishing agent cost reduction is an urgent problem to be solved by the printing and dyeing factory.

    09, yellowing problem

    Hot yellow:

    In operation for a long time downtime caused by fabric retention yellow and amino hydrogen amino silicone oil is easy to be oxidized by air to form chromophore, and yellowing.The product turns brown, and the brown color makes the white fabric look like it has lost its basic whiteness or simply yellowed.The pH is too high, the temperature is too high when drying cotton fabric concomitant substances turn yellow.Strengthen process control.Store for yellowing.Caused by polluting gases in storage.

    10, fluorescence degradation

    Anionic whitening agent/cationic softener ion interaction occurs condensation, should be divided into two processes.

Pan-green: the whitening agent is sensitive to acid or the whitening agent is excessive. Acid-resistant fluorescence plus whitening agent should be selected.

    Light damage: fluorescence brightener light fastness is poor, light effect makes the fabric turn brown, reasonable choice of fluorescence and whitening agent.

    Water quality impact: microorganisms, algae and other impurities are too high, can be filtered precipitation to remove impurities.