Pulp egg tray moulds are the core components in the production of egg packaging using pulp molding technology. They are specifically designed to process eco-friendly raw materials such as waste paper pulp into pulp egg trays, egg cartons, and related products with shock-absorbing and cushioning properties through processes including vacuum suction and compression molding. As the critical link between raw materials and finished products, the rationality of mould design directly determines the forming accuracy, protective performance, and production efficiency of egg trays. These moulds are widely applicable across the entire industry chain, including egg farming, food packaging, and logistics and transportation. Under the policy framework of replacing plastic with paper, pulp egg tray moulds serve as an essential supporting component for the environmentally friendly packaging industry.
Core Structure: Modular Design for High-Efficiency Production
Pulp egg tray moulds adopt a modular assembled structure and mainly consist of two core parts: the upper mould and the lower mould. The subdivided components include the upper mould air chamber, upper transfer mould, lower mould frame, lower mould segments, metal mould mesh, top cover core, folding cover, and other key parts.
Among them, the metal mould mesh is the core functional component. It is usually made of high-strength metal with a mesh size of 30–60 mesh and is closely fitted to the surface of the forming components, serving to filter pulp fibers and ensure forming accuracy. The lower mould segments are fixed in series with bolts. Their cavities adopt a concave spherical design that conforms to the shape of eggs, with bosses and concave ribs arranged on both sides. Small holes are evenly distributed on the surface to achieve vacuum suction and filtration, ensuring uniform deposition of pulp fibers.
Some advanced moulds are also equipped with an electric-push-rod-driven ejection mechanism and protective films, further improving demolding stability and preventing damage to finished products.
The moulds are primarily made of high-strength titanium alloy, stainless steel, and similar materials, offering both lightweight construction and excellent wear resistance. This not only reduces the difficulty of handling and installation but also extends the service life of the moulds, making them suitable for long-term, large-scale production. The upper and lower moulds are precisely matched through structures such as slots and fasteners. Combined with leak-prevention strip designs, this effectively prevents pulp leakage and ensures consistent forming quality.
Core Advantages: Strong Environmental Compatibility & Outstanding Production Efficiency
1. Outstanding Environmental Compatibility: The moulds are specifically designed for renewable raw materials such as waste paper pulp. The resulting pulp egg trays are naturally biodegradable and recyclable, perfectly aligning with the trend toward eco-friendly packaging. Compared with plastic packaging moulds, they better comply with paper-instead-of-plastic policies, effectively reducing resource waste and environmental pollution.
2. Easy Demolding with High Product Integrity: Through an optimized modular structure and a dual design that combines vacuum suction and compressed air demolding, together with an evenly distributed ejection mechanism, fast and stable demolding is realized. This effectively solves the problems of product damage and uneven force commonly associated with traditional moulds, significantly improving the finished product yield.
3. Low Manufacturing & Maintenance Costs: The modular design simplifies the mould manufacturing process, while standardized production of metal mould meshes reduces customization complexity. Some moulds are equipped with inspection door structures that facilitate maintenance of internal components, reduce downtime, and offer a clear cost advantage over long-term operation.
4. Compatibility with Automated Mass Production: The moulds can be directly integrated with automated egg tray machines with rotary drum-type and roller-type systems. Program-controlled processes manage pulp suction, mould closing, and demolding, achieving a forming cycle of only 3–7 seconds. When paired with an egg tray production line, a single set of moulds can deliver an hourly output of 2,000–6,000 pieces, significantly boosting production efficiency.
Compatible Processes & Capacity: Multiple Specifications Available for Comprehensive Application Coverage
The moulds are compatible with both dry press and wet press, the two mainstream pulp molding processes. The dry press process is suitable for low-cost raw materials such as corrugated paper, with a production cycle of 2–3 hours per batch, offering excellent cost performance. It is ideal for small and medium-sized egg producers and short-distance transport packaging for farmers’ markets. The wet press process produces finished products with higher density and superior strength, capable of withstanding a single footstep without deformation, making it suitable for medium- and long-distance transportation as well as supermarket retail packaging.
In terms of specifications, the moulds support multi-category customization and can produce egg trays and egg cartons with capacities of 6, 10, 12, 15, 30 eggs, and more. They are also compatible with shaping requirements for different types of eggs, including duck eggs, goose eggs, and quail eggs. By changing moulds, production can be further expanded to fruit trays, beverage cup holders, seed trays, and other products, enabling diversified packaging applications.
Production capacity can be flexibly adjusted according to the production line configuration, ranging from 2,000 pieces per hour for small workshops to up to 12,000 pieces per hour for large-scale factories, meeting the needs of enterprises of different sizes.
Application Value: Covering the Entire Egg Distribution Value Chain
Finished products manufactured using pulp egg tray moulds offer excellent shock-absorbing and cushioning performance, effectively protecting eggs throughout transportation, storage, and sales. They address the long-standing limitations of traditional open egg trays, which fail to meet the needs of small-package retail. At present, these products are widely used in egg production bases, food packaging plants, and large supermarkets. The egg trays produced are not only compatible with automated egg-loading systems but can also enhance brand recognition through customized printing, making them a core protective solution throughout the egg distribution process.
With the growing global awareness of environmental protection and the upgrading of the packaging industry, pulp egg tray moulds—thanks to their environmental advantages and high production efficiency—have been exported to more than 60 countries and regions. They have helped over a thousand enterprises achieve green packaging transformation and have become one of the core products in the field of eco-friendly packaging equipment.