How does the manufacturer improve the drying rate of the paper tray

The paper tray factory usually refers to the paper tray in a broad sense, that is, the paper tray of the dry pressing process. It is a processing method that takes pulp as raw material and uses stainless steel filter molds under pressure (negative pressure or positive pressure) to dehydrate the pulp and form fibers to produce the desired products. Paper tray production mainly includes pulp preparation, forming, hot pressing, moulding and other processes. Die forming has vacuum forming method and extrusion forming method. Since the pulp used in pulp molding mostly uses waste paper as raw material, it complies with the requirements of environmental protection and the development direction of green packaging. So how can manufacturers improve the drying rate?

How does the paper tray factory improve the drying rate:

The raw material of the paper holder is only about 1% pulp of paper fiber. After the wet paper sheet is formed, the moisture content of the wet paper sheet must be reduced to 55% by mechanical pressing, while the water content of the paper holder after forming is as high as 65%-75%. It is difficult to reduce the water content by mechanical methods. In the production process of the paper tray factory, about 3.5-4.5KG of water is removed per kilogram of the finished paper tray through the drying process, whether it is to reduce production costs or improve the quality of paper trays. It is said that it is of great significance to improve the drying efficiency.

The wet paper mold with paper fiber as the main component is a porous object with a capillary structure inside, and moisture exists between the surface of the fiber and the pores of the fiber capillary. Paper support products used for product inner packaging generally require good dynamic buffer performance, and the moisture in them cannot be completely removed by mechanical pressing, but needs to be removed by drying. Therefore, the drying strength of the pulp molded article is high compared to the conventional paper drying process.

On the one hand, the hot air acts as a heat source to provide energy for removing moisture, and on the other hand, it acts as a moisture carrier to take away the continuously evaporated moisture. The removal of moisture in the wet-pressed paper holder depends on the internal and external diffusion of water. The so-called internal diffusion refers to the migration process of water from the inside to the outer surface of the wet paper holder, and external diffusion refers to the evaporation of water from its surface. The process of taking away.


Post time: May-30-2022