1.The common quality problems in the soft finishing
1)cannot meet corresponding hand feeling: soft finishing style varies with the customer request, for example soft,smooth,fluffy, oil smooth,dry smooth and so on. Choose different softener according to different styles.For example in softener flake,there are different softener flakes with different structures. Their different soft, fluffy,smooth,yellowing will have different effect in the degree on the fabric hydrophilicity.In silicone, modified silicone with different modified genetically , their performance are also different. Such as amino Silicone Emulsion, hydroxyl Silicone Emulsion, ring, oxygen modified Silicone Emulsion, carboxyl modified Silicone Emulsion and so on ,their performance are different.
2)Cationic softener flake have excellent soft effect and hand feeling,easy to absorb in the fabric, but easy to become yellow and color, effect hydrophilicity.If change cationic flake into soft oil , the yellowing hydrophilic problems will be largely improved.If cationic softener flake compounds with hydrophilic Silicone Emulsion, or with hydrophilic finishing agent, its hydrophilicity will be greatly improved. Anionic softener flake or non-ionic softener flake not easy yellowing, some softener flake not yellow, and also not affect the hydrophilicity. Amino Silicone Emulsion is currently the most widely used Silicone Emulsion.But because amino will cause the color yellow, the higher ammonia value is, the more serious the yellowing is. extensive Huang Yue is big, should be to switch to low yellowingoxy modifie d amino Silicone Emulsion or polyether modified, such as not easy yellowing Silicone Emulsion.
3)As for the problem that Silicone Emulsion forming a film will cause the lack of water absorbing genes and closed like a cellulose fiber hydroxyl and carboxyl, amino, such as the water absorption of wool on center, which lead to the falling in water absorption. So it is better to choose anionic, nonionic softener flake and hydrophilic Silicone Emulsion.
Dark spot:The main reason is that oil is not removed from the fabric in pretreatment,and color is darker in oil point when dyeing. Or excessive foam in dyeing bath , the mixture of foam and sweater, dyes touch on the fabric. Or the floating oil in defoamer agent cause dark oil spot. Or Tar in vats touch on the fabric. To process with targeted purpose ,for example add oil-removing agent for refining in pretreatment.Choose dyeing auxiliaries with low bubble, no bubble agent, choose defoaming agent with no easy floating oil.
Light spot:The main reason is that pretreatment is uneven, Mao Xiao in some parts is poor, have refused to dye, or with refusal dye material. Or with magnesium calcium soap in pretreatment, soap, etc., or silk uneven, or uneven drying in semi-finished products .Or stain non dissolved sodium sulphate and Soda ash on fabric. Same with targeted processing, for example strength pretreatment , pretreatment agent must not be easy to form Calcium magnesium soap,Pretreatment must be uniform（This has to do with scouring agent, penetrating agent, chelate disperse agent and mercerizing penetrant).Sodium sulphate, soda ash, etc must be well into the cylinder and must be well controlled in production and management.
Alkali spot:The main reason is that after the pretreatment, such as bleaching, mercerizing alkali not net or uneven, cause the alkali spot, so must strengthen the pretreatment process of alkali process
Softener stains: reasons are as following
The dissolution is poor in softener flake.Massive softener adhesion on the fabric The bubble is too much after diluting softener flake, and when the cloth out of the cylinder, cloth belt on the softener bubble stains;
Poor water quality, high hardness, impurities and water softener combining coagulation on the fabric Cloth surface with anionic substances, in soft processing, combined with cationic softener into stains, or cloth with alkali, condensation of softening agent Softening agent structure is different, some under the high temperature caused by adhesion in fabric softener from emulsion state into slag synthesis and so on. Cylinder in the original tarry softener substances such as drop down on the fabric
Silicone Emulsion spot:it is the most difficult processing kind spot,main reason is: Cloth cover PH value not meet neutral, especially with alkali, which cause Silicone Emulsion emulsion breaking and floating oil. Poor water quality in treatment bath,high hardness, Silicone Emulsion in the water of > 150 PPM hardness easily floating oil Silicone Emulsion quality problems including poor emulsification(Poor emulsifier choosing, poor emulsification process, emulsion particles is too big）Not resistant to shear(Mainly Silicone Emulsion itself problems such as the quality of Silicone Emulsion, emulsified system, Silicone Emulsion varieties ,Silicone Emulsion synthesis process, etc) Can choose shear resistance, resistance to electrolyte, PH changes of Silicone Emulsion, but should pay attention to the use the environment of Silicone Emulsion and , also can consider to choose hydrophilic Silicone Emulsion.
9）Poor fuzz:Poor fuzz has closely relationship with napping machine operation(for example tension control ,fuzz roller speed).For fuzzing agent,when adding softener agent, the key is to control dynamic and static friction coefficient for the fabric, so the preparation for fuzzing agent is the key).If softener agent is used improperly, this will directly lead to poor fluff, even cause fabric broken or width changed
Problem of formaldehyde: formaldehyde content is beyond the standard.Should adopt ultra-low formaldehyde resin or formaldehyde-free resin. Of course, the source of the formaldehyde problem is very broad , such as fixing agent Y, M, softening agent MS - 20, S - 1, waterproofing agent AEG, the FTC, adhesives agent RF, flame retardant THPCthese agents will cause formaldehyde to exceed.
The yellowing and changing color problem:resin finishing generally causes to yellow, so try to control PH value in resin finishing agent, acid composition, catalyst composition to reduce yellowing and color changing.
Puissant drop problem: general resin finishing will produce strong down, fiber protective agent can be added, such as oxidized polyethylene wax emulsion.
Hand feeling problem:General resin finishing will cause hand feel hardening phenomenon, soft components can be added, but must pay attention to not affect the quality of the resin finishing. If hand feeling is improved, puissant drop problem also have been greatly improved. But surface resin feel stiff problems caused by the resin itself and caused by such drying, must improve with targeted measures.
3.Other quality problems
1) Metal ions excessive:if detecting Cu、Cr、Co、Ni、Zn、Hg、As、Pb、Cd metal ion excessiv e than the standard in export products,it will be also cause serious consequence as e excessive formaldehyde.
2)Color changing problem: Color changing problem is very common after finishing process.So must pay attention to choose dye when dying. When dyeing proofing, must do the corresponding finishing according to the process, and judge whether dye chose will change color in the finishing in the auxiliary function. Of course, the most ideal solution is to choose those finishing agent that cannot cause color changing, but this have limitation.
3）APEO excessive standard: APEO as a indicator is also strictly controlled. This indicator is related to refining agent,penetrating agent in pre finishing, cleaning agent, leveling agent in print dyeing and emulsification agent in softener finishing agent.For the present,TX、NP series surfactant agent are widely used as auxiliary material, in this case, it is difficult to take a precaution. So the only way is that dyeing factories insist on using environmental auxiliary,and strictly prohibit auxiliary with APEO and poisonous material into factory for using.