Effect Of Non Cellulose On Adhesive Force Between Pulp And Cotton Yarn

The sizing temperature is related to fiber type.For short fibers,the warp sizing can be divided into high temperature sizing and medium temperature sizing according to the size of pulp temperature.High temperature pulp will cause a lot of energy waste.In order to save energy and environmental protection,the medium temperature sizing is the development direction.However,there are some problems in medium temperature sizing.When sizing the cotton yarn,the pulp rate is low,the adhesion force is small,and the wear resistance is increased.In view of the problems in medium temperature sizing process,this paper mainly studies the following aspects:(1)Extraction and analysis of non-cellulosic materials from cotton fibers in different producing areas,and the amount of non-cellulose in cotton fiber accounted for 4.3% to 7.2% of the dry weight of cotton fiber.It is difficult to remove the non-cellulosic material from cotton fiber,which needs to be cleaned by sodium hydroxide,surfactant,high temperature and long time.(2)The dewaxing observed by a scanning electron microscope(SEM)before and after the cotton fiber,cotton fiber surface are distributed in SEM showed that cotton wax lacquer in the outermost layers of the cotton fiber,at the same time the yellow prussiate dyeing method,analyzed the dewaxing of cotton fiber before and after the show,found that pectin in cotton wax below.Cotton wax melting point is determined by DSC for 50 ? to 75 ?.(3)The suction height of cotton core experiments show that the main factors affecting cotton yarn wettability are made of cotton fiber shows that cotton wax,pectic substance as a condensation agent other than cellulose material bonded together,remove pectin can better cotton wax removal.(4)The cotton yarn,respectively,in 65 ?,95 ? water dipping 2 s,3 s,5 s,dry test yarn core height,water absorption time,absorption of cellulose material removal rate.Results show that when the dipping time is less than 3 seconds,whether in 95 ?water or in 65 ? water treatment can remove non-cellulosic substances on the surface of the cotton fiber,can significantly improve the wettability cotton yarn.In the actual production of sizing yarn,due to the fast speed of the pulp machine,the time of pulp soaking is very short.Even with the high temperature sizing process,thenon-cellulosic material on the cotton fiber cannot be removed.(5)The adhesive difference between high temperature pulp and medium temperature pulp on cotton yarn is obvious.The cause of the difference is in addition to the high temperature pulp molecular motion speed,make the pulp can better penetration into the yarn,the pulp are than at 65 ? 95 ? with a lower surface tension,lower viscosity.Low surface tension and low viscosity pulp have better permeability to roving.The non-cellulosic material on cotton fiber is also the factor that affects the pulp sizing of pure cotton,but it is not the only factor.(6)Compared to the original yarn and alkali refining yarn sizing quality,alkali refining sizing in sizing rate,strength,wear resistance is far better than the original yarn sizing,analyze the causes,and on the surface of the cotton fiber non-cellulosic substances affect the adhesion of fluid on cotton yarn,affect the wetting fluid on cotton yarn,which affect the sizing performance.(7)There is a significant difference between high temperature and medium temperature sizing effect,mainly due to the difference in the viscosity,surface tension and the molecular movement speed of the pulp in the high temperature and medium temperature.In the use of medium temperature sizing process,the cotton yarn can be pretreated to reduce the viscosity of the pulp and the surface tension of the pulp.