1 Drying method and drying mechanism of pulp moldings At present, most of the domestic pulp moldings are dried by hot air, and the hot molded air is used as a drying medium to dry the pulp moldings in a specific drying equipment. Hot air is mainly obtained in two ways, one is to directly generate hot air by burning with a hot blast stove, and the other is to use hot steam to exchange hot air with air to generate hot air. The equipment used in the drying process of pulp moldings mainly includes drying ovens, tunnel dryers and chain dryers. Regardless of which drying equipment is used, the drying mechanism is substantially the same. 2 Ways to improve the drying efficiency of pulp moldings In the drying process of pulp moldings, in order to improve the drying efficiency, it is necessary to reduce the humidity of the drying medium (hot air) and increase the temperature and air velocity, but it is necessary to simultaneously increase the moisture, Outer diffusion rate. In production practice, it can be achieved through the following ways. 2.1 Appropriate reduction of the thickness of the pulp molded product The greater the thickness of the pulp molded article, the more difficult it is to dry. Therefore, when designing the thickness dimension of the pulp molded product, the thickness should be minimized under the premise of ensuring the overall strength and satisfying the packaging performance, which is beneficial to the improvement of the drying efficiency and the reduction of the fiber raw material consumption. The difference in thickness of each part should not be too large to avoid the difficulty of outward diffusion of local moisture and affect the overall drying speed. 2.2 Properly increase the moisture gradient on the surface and inside of the wet paper mold blank. During the drying process, the moisture concentration on the surface of the wet paper mold blank and the inside is the main driving force for moisture diffusion. Increasing the moisture gradient by adjusting the temperature, humidity, wind speed and air volume of the hot air is advantageous for increasing the diffusion within the water. However, if the moisture diffusion rate is too large, the surface of the wet paper mold shrinks too quickly and affects the internal diffusion speed of the moisture, which will have a negative effect on the drying of the pulp molded article. 2.3 Appropriately increase the temperature at drying The increase in drying temperature facilitates the migration of moisture from the interior of the wet paper mold blank to the surface. However, in the production practice, the temperature increase is limited by many aspects, so it can only be properly improved. 3 Production process conditions during drying 3.1 Drying temperature Increasing the temperature can speed up the drying process. 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. 3.2 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. 3.3 Speed ​​and flow of hot air The speed and flow rate of hot air entering the drying unit 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. 4 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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A wet paper mold blank comprising pulp as a main component is a porous object having a capillary structure inside. Moisture is present between the surface of the fiber and the pores of the fiber capillary. The pulp molded products used for the inner packaging of the product generally require good dynamic cushioning performance, and the moisture therein cannot be removed by mechanical pressing, and all needs to be removed in a dry manner. Therefore, the pulp molded article has a large drying strength as compared with the conventional sheet drying process. On the one hand, hot air acts as a heat source to provide energy for removing moisture; on the other hand, it acts as a water carrier to carry away the continuously evaporated water. The moisture in the wet paper mold blank is dependent on the internal diffusion and out-diffusion of moisture. The so-called internal diffusion refers to the migration process of moisture from the interior to the surface in the wet paper mold blank; the external diffusion refers to the evaporation of water from the surface after it is evaporated. The process of going. The drying efficiency of pulp molded products depends on the speed of internal and external diffusion of moisture and the balance and coordination between the two. Reasonable technological conditions are formulated around the above two aspects and the dry physical properties of pulp molded products. 
Drying method and drying mechanism of pulp molded products
Pulp molding is a new type of packaging material produced from pulp as raw material, which is widely used in the inner packaging of various products. The production process of pulp moldings is divided into three processes: slurry treatment, vacuum forming and thermal energy drying. The energy consumption of the drying process accounts for a large proportion of the total production cost. How to reasonably determine the drying process conditions and reduce energy consumption is a key issue for improving the economic benefits of enterprises.