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Drying of Rubber Sheet Using Impingement of Multiple Hot Air Jets

机译：使用多个热空气喷气机的冲击干燥橡胶板

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In the process for producing ribbed smoked rubber sheet, the rubber sheet drying is the most time and energy consumption process. This research study the possibility in develop new drying system using array of hot air jets impinging directly on rubber sheet in order to reduce time for drying rubber in smoked room and increase productivity of rubber sheets. In the study, the array of jets from jet plate with drilled jet holes in staggered arrangement impinged on the both side of rubber sheet. The effects of jet velocity (V_j=10, 16, 23 m/s), jet temperature (T_j=50, 60, 70°C) and the distance from jet outlet to rubber surface (L=4D, 6D, 8D which D is diameter of jet hole) on drying rate were investigated by measuring weight of rubber sheet change with time. The heat transfer rate on impinged surface was also measured by attaching a heat flux sensor on impinged wall. The results showed that the convective heat transfer coefficient increased when the jet velocity was increased and when the distance from jet was decreased particularly in jet directly impinged region. It was found that the enhancement in heat transfer rate from jets cannot increase the rubber drying rate for all cases because the drying rate depend on rubber property. The process of rubber sheet drying can be divided in 2 periods; in the first drying period, the drying rate decreases with decreased moisture content. The drying rate depended on the initial moisture content and the condition of external effect such as jet velocity, jet temperature and distance from jet outlet to rubber surface. In second drying period, the moisture content is below 20% dry basis. In this period, the drying rate is almost constant near zero. It was also found that the drying for case of L=6D was higher than case of L=4D and 8D. The optimum condition for rubber sheet drying without defects on rubber property after drying was L=6D and T_j=70°C.
机译：在生产罗纹烟熏橡胶板的过程中，橡胶板干燥是最多的时间和能耗过程。本研究研究了使用直接在橡胶板上撞击的热空气喷气机阵列开发新的干燥系统的可能性，以减少烟熏室内干燥橡胶的时间，提高橡胶板的生产率。在研究中，来自喷射板的喷射阵列，其中钻孔孔的交错装置撞击在橡胶板的两侧。喷射速度（V_J = 10,16,23 m / s）的影响，喷射温度（T_J = 50,60,70℃）和从喷射出口到橡胶表面的距离（L = 4d，6d，8d，d通过测量橡胶板的重量随着时间的推移来研究干燥速率的射流直径。还通过在撞击的壁上附着热磁通传感器来测量冲击表面上的传热速率。结果表明，当射流速度增加时，对流传热系数增加，当从射流的距离在直接撞击区域时，当射流的距离降低时。结果发现，由于干燥速率取决于橡胶性能，从喷气机的热传递率的增强不能增加所有情况的橡胶干燥速率。橡胶板干燥过程可分为2个时段;在第一干燥期间，干燥速率随着水分含量降低而降低。干燥速率依赖于初始含水量和外部效果的条件，例如喷射速度，喷射温度和从喷射出口到橡胶表面的距离。在第二种干燥期间，水分含量低于20％干基。在此期间，干燥速率几乎恒定接近零。还发现L = 6d的情况下的干燥高于L = 4d和8d的情况。干燥后橡胶性能橡胶板干燥的最佳条件为L = 6D和T_J = 70℃。

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