In recent years, with the continuous advancements in pulp molding production technology, processes, and equipment, the industry has further categorized the various pulp molding production methods. Here are the primary types:
1. Dry Press Process
The dry press process is the traditional method of pulp molding production. In this process, molding, drying, shaping, and trimming are performed separately.
- Wet pulp molds are first shaped on the forming machine.
- These molds are then transferred to an external dryer for drying (out-of-mold drying).
- Finally, shaping and trimming are carried out to complete the production.
This process is relatively simple and consumes less energy. It is primarily used to produce egg trays, fruit trays, and general industrial packaging products.
2. Wet Press Process
The wet press process has gained rapid development in recent years, with mature technologies widely adopted across industries.
- This method integrates molding, drying, shaping, and even trimming into a single fully automated machine (in-mold drying).
- It is highly efficient and produces high-quality, finely detailed products.
However, it has a higher energy consumption rate. This process is commonly used for products with high precision requirements, such as food-grade tableware and premium industrial packaging.
3. Semi-Dry Press Process
The semi-dry press process involves pre-drying the molded products through methods such as air-drying, sun-drying, or spraying, keeping the moisture content at approximately 35%.
- After pre-drying, the molds undergo in-mold drying or shaping to produce high-quality pulp products.
This method strikes a balance between the wet press and dry press processes, delivering high-quality products while significantly reducing energy consumption compared to the wet press process. It is also more efficient than the dry press method.
4. Direct Press Process
The direct press process is a transformative innovation in pulp molding production.
- It utilizes roll or sheet raw pulp boards without disintegration or water treatment.
- The raw material is directly processed, often with sprayed latex resin or additives as required, to form a loose fiber web on the molding screen.
- Heat pressing and die-cutting equipment are then used to create the final molded pulp product.
This dry molding process eliminates the energy-intensive steps of rehydration, disintegration, and drying in traditional wet processes.
- Advantages: High efficiency, energy savings, and environmental sustainability.
- Applications: It has gained significant attention within the industry, with many domestic and international manufacturers focusing on the development of direct press equipment and technology.
KBD and Pulp Molding Technology
As part of the growing pulp molding industry, KBD Pulp Mould Packaging Equipment and Products Philippines Inc. is committed to providing eco-friendly packaging solutions and advanced production equipment. Our technologies cater to diverse needs across industries, from food service to consumer goods, ensuring both quality and sustainability.
For inquiries or to learn more about our offerings, feel free to contact KBD—your partner in sustainable pulp molding solutions.
