What is the working principle of paper pulp molding machine

Pulp molding machine is a kind of equipment that molds pulp into various products through a specific mold. It is widely used in the production of environmentally friendly tableware, packaging materials and industrial parts. Its working principle includes the following main steps:

1. Pulp preparation

Raw material selection and processing:

- Raw materials: usually waste paper, cardboard or other plant fibers are used.

- Pulping: The raw materials are made into pulp by a hydraulic pulper, and then after screening, purification and other steps, impurities are removed to obtain uniform pulp.

2. Molding

Mold design and application:

- Mold preparation: Design a specific mold according to the shape and size of the product. The mold is generally made of metal or high-strength plastic.

- Pulp injection: Inject pulp into the molding mold, which usually consists of two parts, upper and lower.

Vacuum adsorption molding:

- Vacuum adsorption: The water in the mold is extracted by a vacuum pump to form a solid shape of the pulp on the surface of the mold. This process requires the control of vacuum degree and time to ensure uniform thickness and density of the product.

3. Pressing and curing

Preliminary pressing:

- Pressing and forming: Use a hydraulic press to press the preliminarily formed pulp to further remove moisture and increase the density and strength of the product.

Drying and curing:

- Drying method: Drying usually adopts methods such as hot air drying or microwave drying. By controlling the temperature and time, ensure that the product is completely dry to achieve the final strength and hardness.

4. Post-processing

Finishing and surface treatment:

- Trimming and grinding: Remove excess edges and corners to make the product surface smooth and flat.

- Surface treatment: Waterproof and oil-proof treatment can be performed as needed, or other functional coatings can be added.

5. Quality inspection and packaging

Quality inspection:

- Inspection standards: Test the products according to the set quality standards to ensure that each product meets the requirements.

- Packaging: Qualified products can be directly put on the market after packaging.

Key technologies and equipment

Automation control system:

- PLC control: Modern pulp molding machines are usually equipped with PLC (Programmable Logic Controller) systems to achieve automated control of the entire production process, improve production efficiency and product consistency.

Energy saving and environmental protection:

- Recycling: Wastewater and waste pulp generated during the production process can be recycled to reduce resource waste and environmental pollution.

Application areas

Widely used:

- Environmentally friendly tableware: such as pulp molded cup lids, dinner plates, knives, forks and spoons.

- Industrial packaging: such as electronic product packaging, shockproof buffer materials.

- Agriculture and horticulture: such as seedling trays, flower pots, etc.

In general, pulp molding machines convert pulp raw materials into a variety of environmentally friendly products through pulping, molding, pressing, drying and post-processing steps. Its working principle embodies the concept of green manufacturing and resource recycling.