滤棒成型工艺参数与质量稳定性的关系

为有效控制滤棒成型过程中的质量波动,用2.4Y/34000、3.0Y/35000和3.3Y/37000规格的醋纤丝束在KDF-2型滤棒成型机上进行了丝束开松比、螺纹辊压力、空气喷嘴压力及稳定辊压力对滤棒压降和硬度指标稳定性的影响试验。结果表明①在丝束规格一定的情况下,辊速比、螺纹辊压力、空气喷嘴压力及稳定辊压力等参数对醋纤丝束稳定开松和成型起决定性作用。②不同规格的丝束对辊速比的选择略有不同,对于2.4Y/34000规格的丝束,辊速比为1.20~1.25;3.0Y/35000规格的丝束,辊速比为1.40~1.45;3.3Y/37000规格的丝束,辊速比为1.50~1.55时,可获得最稳定的滤棒压降和硬度。③在试验范围内,螺纹辊压力控制在0.18~0.20MPa、稳定辊压力控制在0.08~0.10MPa较适宜。④为保证滤棒质量稳定,在满足加工目标的前提下,应尽量减小空气喷嘴压力,一般不宜超过0.08MPa。

Relationship Between Quality Stability and Processing Parameters in Filter Rod Making

In order to effectively narrow quality fluctuation in filter rod making, the effects of tow opening ratio and pressure on threaded rolls and stabilizer rolls, and air jet pressure on the stability of pressure drop and hardness of filter rod were studied on KDF-2 filter maker by using three acetate tow items, 2.4Y/34000, 3.0Y/35000 and 3.3Y/37000. The results indicated that: 1) for the same tow item, the speed ratio between rolls, the pressure on threaded rolls and stabilizer rolls, and air jet pressure were the key factors influencing tow opening and filter rod forming; 2) the favorable speed ratio between rolls might be somewhat different for different tow items, the pressure drop and hardness of filter rod were the stablest when the speed ratio between rolls was controlled in the range of 1.20-1.25, 1.40-1.45 and 1.50-1.55 for the tow items of 2.4Y/34000, 3.0Y/35000 and 3.3Y/37000, respectively; 3) within the test limits, it was preferable to keep the pressure on threaded rolls and stabilizer rolls in the range of 0.18-0.20MPa and 0.08-0.10MPa, respectively; 4) to ensure the quality stability of filter rod, air jet pressure should be kept as low as possible in case that the process was not negatively affected, normally, it was not recommended to exceed 0.08MPa.