Pulp tray packaging is a three-dimensional three-dimensional paper material that uses waste paper, pulp, sugarcane pulp and other fibers as raw materials, and is formed by molding. Due to its good performance and environmental protection, it is widely used. The following is an introduction to paper tray packaging. Development history: The paper tray technology and the first product appeared in Denmark as early as possible, and automated assembly line production could be formed in the 1960s, but it was not widely used at that time.

Until plastic packaging caused a lot of white pollution in daily production and life, and a new type of environmentally friendly packaging material was urgently needed in the market, paper tray packaging received attention. Development of the packaging industry. With the maturity of the production process, paper trays can be widely produced in large quantities at present, but in the production process of paper trays, drying is a very important process, and it occupies a large production cost. How can the production process improve the drying efficiency of paper trays? ?

The raw material of the pulp tray is only about 1% pulp of paper fibers. 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 moisture content of the paper tray 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, about 3.5-4.5KG of water should be removed per kilogram of the finished paper tray through the drying process, whether in terms of reducing the production cost or improving the quality of the paper tray , 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. Pulp trays used for product inner packaging generally require good dynamic buffering properties, 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. The dry rate of the paper tray depends on the speed of the internal and external diffusion of moisture and the balance between the two. The reasonable process conditions should be formulated around the above two aspects and the dry physical properties of the paper tray product!

However, the development of my country’s pulp tray industry started relatively slowly, and paper trays continued to introduce and learn foreign craftsmanship in the process, so the paper tray industry developed rapidly, and the number of paper tray manufacturers in the market was greatly increased. And with the advancement of technology, paper trays have gradually developed from low-end products such as eggs, fruits, and beer bottles in the past to lining packaging of products. Static, moisture-proof and other properties, and can also customize all kinds of paper tray packaging according to the needs, so it is favored by enterprises in different industries and becomes a good choice for product packaging!