Pulp molding wet pressing process.

Wet pressing process refers to the pulp through the pipe into the molding mold, vacuum absorption of excess water, the formation of wet embryo immediately transferred to the hot pressing molding mold for rapid extrusion drying process;.

Wet pressing process advantages:wet pressing process environmental tableware production efficiency, molding immediately after transfer molding, fast production speed; wet pressing process wet embryo moisture content of about 65-75%, high moisture content, vacuum adsorption time is long; wet pressing process to produce biodegradable tableware smooth and delicate surface, beautiful and beautiful; wet pressing process to produce disposable lunch boxes with thin wall thickness, high density, saving volume.

Disadvantages of wet pressing process: disposable lunch box products with small slope are not easy to pull out the mold or demold; products with small R angle or small slope have high net breaking rate; large heat energy consumption.

Application areas of wet pressing process:

A. Fine work package, also known as high-grade paper-plastic work package eco cutlery, mainly through wet pressing molding external smooth and beautiful molded products, these products are mostly applied to high-grade electronic liner boxes, high-grade razor packaging boxes, high-grade clothes packaging boxes, glasses boxes, etc. These products require high precision, beautiful appearance and higher added value than ordinary wet pressing products.

In order to be more beautiful and improve the added value of the packaged products, these products can also be printed in color to better display the packaging effect.

Second, food packaging containers, that is, we often say disposable biodegradable tableware, generally refers to plates, bowls, boxes, cakes and plates to hold food wet pressing molding products, generally made of wheat straw sugar cane and other plant fibers, add food-grade water and oil-resistant dose.

Can be used in the process of daily dining, hotel dining, take-out delivery, etc. These products require microorganisms, heavy metals, etc. Must meet the food-grade requirements and use clean workshop production, neat and beautiful appearance.

Third, medical trays, mainly wet press products, mostly used for registration equipment, drug stacks, etc., require clean workshop production, microorganisms must be controlled according to medical standards, dust-free vacuum sealing.

Fourth, entertainment toys, refers to the mask. Color coated toys, etc., can be produced by semi-dry pressing and wet pressing two kinds of technology, requiring a better external smoothness, better retention of the dyes applied, so that the feel is more delicate. Lubrication.

Pulp molding dry pressing process.

Dry pressing is a process in which the pulp is injected into the molding mold through a pipe, the excess water is absorbed by vacuum to form a wet embryo, and then the moisture of the wet embryo is reduced to about 40% by natural drying or through a special drying channel, and then the molding process is carried out. This process is mostly used to produce low-grade pulp egg trays, pulp packaging and other products.

Advantages:small thermal energy consumption, reduced energy consumption; mostly pulp products, recyclable waste paper, low cost and low price; thick products, good shock and pressure resistance; packaging electronic products can prevent static electricity.

Disadvantages: dry pressing products (including semi-dry pressing) rough surface, poor aesthetics; thick walls, accounting for large volume.

Application areas of dry pressing process :

A, ordinary work package, generally refers to the yellow pulp dry pressing process production of low-end electronic products lining . Egg tray. Fruit tray and other products, the product is rough, the main role is to prevent shock and pressure, the aesthetic requirements are not high.

2. Agricultural packaging mainly refers to flower pots, seedling cups, egg trays, etc.. Most of these products are produced by dry pressing process of yellow pulp and newspaper pulp. These products have low sanitary requirements and low stiffness, but better waterproof performance.

Third, medical packaging, dry pressing is mainly used for potties, urinals, kidney-shaped trays and other less demanding places.