Pulp molding production process

is a manufacturing method in which pulp is processed into a desired shape through a mold. According to different processing methods and process characteristics, the pulp molding production process can be divided into four types: dry pressing, wet pressing, semi-dry pressing and direct pressing. The following is a detailed introduction to each process:

1. Dry pressing process

The dry pressing process, also known as dry molding, is a method of molding with a low moisture content in the pulp. This process is suitable for the situation where the moisture content of pulp is lower than 10%. In the dry pressing process, the pulp is first dewatered and compressed, and then placed in a mold, where the pulp is formed into the desired shape by high-pressure mechanical pressure. The products produced by this method are usually relatively hard and stable, and are suitable for some products with high requirements, such as cartons, cardboard, etc.

2. Wet pressing process

The wet pressing process is a method of molding under the condition of high moisture content of pulp. This process is suitable for the situation where the moisture content of pulp is about 20%. In the wet pressing process, the pulp is dewatered to some extent and then placed in a mold where mechanical pressure is used to form the pulp into the desired shape. The products produced by the wet pressing process are usually relatively soft, which is suitable for some products that need to be bent or deformed, such as paper plates, paper cups, etc.

3. Semi-dry pressing process

The semi-dry pressing process is a combination of dry pressing process and wet pressing process. The moisture content of pulp is between dry pressing and wet pressing, usually between 10% and 20%. The semi-dry pressing process combines the advantages of the two processes, which can not only maintain a certain degree of hardness and stability, but also maintain a certain degree of softness and plasticity. This process is suitable for some applications where the product performance requirements are between hard and soft, such as some paper packaging materials.

4. Direct pressure process

The direct pressing process is a method in which the pulp is directly put into a mold, and then the pulp is formed into the desired shape by mechanical pressure. This process is relatively simple and is suitable for some products with relatively simple shapes. However, the direct compression process usually cannot maintain the stability and consistency of the product, so it is less used in some applications that require higher product performance.

In short, the choice of pulp molding production process depends on the performance requirements, shape complexity and production efficiency of the desired product. Different process types have different characteristics and scope of application, and producers can choose the appropriate process to produce the required pulp products according to the specific situation.

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