1. Production process conditions during drying 1.1 Drying temperature Increasing the temperature can speed up the drying. However, if the temperature is too high, the overall strength and other performance indexes of the pulp molded product will be lowered, and various parts in the wet paper mold blank will form a large temperature gradient, and a large thermal stress will be generated to cause defects in the pulp molded product. In addition, too high a hot air temperature will increase the energy consumption, and the thermal efficiency of drying is seriously reduced. Therefore, when the wet paper mold blank is dried, the temperature of the hot air is generally controlled at about 110 ° C, absolutely not allowed to exceed 120 ° C, and the temperature of each part in the drying equipment should be kept consistent.
1.2 Control of hot air humidity during drying Control of hot air humidity is very important. The moisture evaporated in the initial stage of the wet paper mold blank drying will cause the humidity in the drying equipment to increase continuously, thereby prolonging the drying time of the pulp molded product and reducing the drying efficiency. For some hot air circulation drying equipment, the ratio of circulating hot air to fresh hot air should be adjusted at any time, so that the drying efficiency of the drying equipment is not caused by excessive humidity.
1.3 The speed and flow rate of hot air The speed and flow rate of hot air entering the drying equipment is also an effective way to increase the drying speed. The rate of moisture diffusion of the wet paper mold blank depends to a large extent on the speed and flow rate of the hot air in the drying equipment, and requires high-speed hot air to be uniformly blown onto the surface of the wet paper mold blank and to ensure sufficient hot air flow. It is uniformly dried, and generally, when the hot air velocity reaches 5 m/sec or more, the pulp molded article can be dried relatively quickly.
Conclusion The drying process of pulp molded products directly affects product quality and production costs. Therefore, it is important to master the drying mechanism, characteristics and to determine reasonable drying conditions. At present, in the domestic production enterprises, the drying process of pulp moldings generally has the problems of high energy consumption and low drying efficiency, some of which are defects of the drying equipment itself, but most of them are not controlled in the production of hot air. Three major technological factors, humidity and flow rate (flow rate), reasonable determination of these three major process elements, in order to obtain a better drying effect of pulp moldings.
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