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Introduction of pulp molding wet pressing process
Sep 25, 2018

The pulp molding wet pressing process mainly includes the following processes:

1, pulping

Pulping involves two steps of beating and blending. Pulping is to pour the pulp molding raw material into the hydraulic pulper, and the pulp pulp is broken into fiber slurry by the hydraulic pulper, and the disintegrated fiber slurry is subjected to purification treatment such as screening, sand removal, etc., and then refining. The machine will properly separate the fibers. The slurry is added into the processed slurry to add fillers, pigments, and functional additives such as water and oil, and is formulated into a slurry suitable for the quality requirements of the product. In order to ensure the continuous production process and the uniformity of the product, it is necessary to control the liquid level in the storage tank and the mixing tank, and regularly add filler, water and ingredients.

2, molding

The molding of pulp molded articles is currently commonly used in vacuum forming. The basic principle of vacuum forming is that the inner cavity of the lower mold cavity of the screen mold which is submerged in the pulp is vacuumed and kept under a negative pressure for a certain period of time, and the plant fibers in the pulp are adsorbed on the outer surface of the lower mold, and at the same time The water is sucked out to form a product.

3, plastic surgery

Due to the different degrees of deformation of the wet paper blank after drying or drying, the surface of the product also has different degrees of wrinkles. Therefore, the product needs to be shaped after drying. Shaping is to place the product on a shaping machine equipped with a mold. Through the high temperature and high pressure of the shaping machine, a more regular shape and a smoother surface are obtained. Since the wet pressing process is formed by the product and is not dried, it is directly subjected to hot press forming. Therefore, in order to ensure sufficient drying of the product, the hot pressing time is generally more than 1 minute (specific hot pressing time, depending on the thickness of the product).

4, trimming

After the products obtained in the above steps, there are irregularities or swarf on the edges. Therefore, some products with higher quality requirements or structural requirements for cutting a certain part also need to be trimmed, and the trimming is carried out. The cutter of the product is carried out on the trimming machine.

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  • Contact Us

    Add: 80th East Jinque Road, Wujiaxiang Industrial District, Yisuhe Town, Xiangtan County, Hunan Province, P.R.China.
    Contact: Rosemary Han
    Mob: +86-17700793582
    Tel: +86-731-84632066
    E-mail: sales2@zhmachines.com

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