Research On The Heat And Wet Treatment Properties And Modulus Of Cellulose Diacetate Filaments

Cellulose diacetate fiber was the second category of regenerated cellulose fiber which wasbehind of viscose acetal fiber. Cellulose diacetate fiber has an important position in cigarette filtermaterial market, and also is the first selection of filter rods, as cellulose diacetate has numerousadvantages such as non-toxic, tasteless, small resistance, good thermal stability, high filtrationefficiency and can significantly reduce the harmful components in flue gas such as tar and nitriteamine.Cellulose diacetate fiber which has smaller fineness has a better filter performance, becauseit has a larger surface area, smaller space between fibers, these characteristics are helpful to filtertar and other harmful ingredients. While during the process of cellulose diacetate fiber production,the smaller fineness cellulose diacetate fiber has, the more fly produced. The fiber fly will increasethe burden during the fiber blooming process and the filter rod forming, and also can lead to towmolten hole and hard surface of the cigarette, has a great influence on cellulose diacetate fiberqualities. Different fineness of cellulose diacetate fiber has different quantity of flies during theproduction, so the research on the properties of different fineness cellulose diacetate fiber is verynecessary. This topic has been studied the surface property, internal structure, mechanical propertyand thermal property of cellulose diacetate fiber based on three kinds of fiber fineness.Due to the cellulose diacetate fiber with smaller fineness producing more flies in the process, and the cellulose diacetate fiber with bigger fineness has poorer filtration performance whichrelative to the smaller fineness, so in the next section this topic chose the cellulose diacetate fiberwith a fineness of medium denier3.9d as the object of the study. Cellulose diacetate fiber willsuffer different degree of heat treatment during the processing, such as tube temperature, in thestuffing box curling, the oven drying and so on, so the research on the performance of cellulosediacetate fiber after the heat treatment is very central. This integrated research on cellulosediacetate fiber based on different dry heat treatment and cooling had studied the surface properties,internal structure, mechanical properties and thermal properties, discussing the changes ofcellulose diacetate fiber after heat and cooling treatment. This has guiding significance for thetemperature control in the process of actual production.At the same time, in order to reduce the fly, some research discovered that the main reason ofthe fly formation is that when cellulose diacetate fiber entering the stuffing box curling machineduring production process, it will suffer heat and wet treatment along with bending or extrusion,after achieving permanent curl, the cellulose diacetate fiber will form local damage, physicaldefects, wrinkles and get more weak sections, therefore cellulose diacetate fiber will easilyfracture in the opening process and produce short fibers or debris, which is flying. So to reduceflying, we should reduce the fiber damage degree in the stuffing box curling machine. Also we canincrease the flexibility of fiber, which means reducing the cellulose diacetate fiber stiffness,adding a lower fiber modulus quantitative processing before curling. This paper studied the heatand wet treatment influence on the cellulose diacetate fiber, discussing the mechanical propertiesof cellulose diacetate fiber and the relationship between modulus and processing time and treatingtemperature. According to the research we found that the initial modulus of the cellulose diacetatefiber decreased as the processing temperature going up and the treating time getting longer. This isthe first comprehensive step on the research way to the lower cellulose diacetate fiber modulusbefore curling.