At present, molded pulp products play an increasingly important role in the food packaging industry, the most popular products include egg trays, fruit trays, and industrial package trays for various customized products with unique shape designs. Among them, egg trays and egg cartons are the most popular pulp products produced by modern egg tray/carton machines. The physical properties of molded pulp materials directly determine their suitability, performance boundaries, and optimization potential in food packaging scenarios.
In the process of egg tray production, these properties not only support food safety and logistics efficiency but also define the equipment configuration and process design of the egg tray machine and related eggtray drying, eggtray packaging, and labeling equipment; sometimes a hot pressing machine is required.
Core Food Packaging Requirements of Paper Tray
Cushioning and Shock Absorption
The basic function of eggtrays and other paper trays is the protection to the product inside, and this function is realized through optimized structural design—such as grooves, ribs, or honeycomb structures—molded pulp products achieve excellent cushioning and impact resistance.
Egg tray shells are fragile and easy to break, so cushioning is particularly critical in egg tray production, where egg trays manufactured by an egg tray machine effectively protect fragile products such as eggs, fresh fruits, delicate agricultural produce.
Compared with traditional plastic packaging, molded pulp trays can reduce transport damage rates by approximately 36%, making them ideal for fresh food transportation packaging.
Breathability and Moisture Regulation
Fruit and egg products preservation requires the stock environment to be clean,dry and plenty of air, industrial products are also requires dry environment, the natural fiber structure of molded pulp products provides inherent breathability, allowing air circulation and moisture regulation inside the package.
Hear are the key benefits of pulp molded egg trays and fruit trays:
- Slowing fruit and vegetable respiration
- Reducing moisture loss
- Extending shelf life by 2–3 days compared with sealed plastic packaging
The eggtrays and cartons of molded pulp packaging produced by egg tray machines highly suitable for:
- Fresh fruit packaging
- Vegetable trays
- Agricultural produce logistics
Stackability and Structural Stability
Molded pulp eggtrays can be stacked vertically for package with less space required. The shape stability allows it for efficient stacking during storage and transportation.
If you have large-scale egg tray production line, it can bring you the following benefits:
- Improved warehouse utilization
- Increased single-transport volume (up to 230% improvement)
- Lower logistics and handling costs
These advantages make molded pulp packaging well-suited for industrial food supply chains and mass distribution systems.
Application of Molded Pulp Packaging Product
Molded pulp products are used in various packaging solutions. Despite their advantages, they also have inherent limitations that restrict certain food packaging applications.
Limited Water and Oil Resistance
If eggtrays are produced without surface treatment, molded pulp products tend to absorb water and oil, leading to:
- Softening
- Deformation
- Loss of structural integrity
So they cannot be directly used for soup containers and oily or fried food packaging, additional surface treatment are needed.
Although waterproof or oil-resistant coatings can be applied during egg tray production, this increases costs by 15–30% and may partially reduce environmental benefits.
Restricted Load-Bearing Capacity
Compared with rigid plastic or metal packaging, molded pulp products have:
- Lower bending resistance
- Limited load-bearing capacity
For example, large fresh food trays exceeding 5 kg may deform or collapse, making them unsuitable for long-distance transportation of heavy food products without reinforcement.
Moisture Absorption and Mold Risk
In high-humidity environments, molded pulp packaging is prone to:
- Moisture absorption
- Mold and bacterial growth
This places higher demands on:
- Storage conditions
- Moisture-proof packaging measures
As a result, applications in humid regions or long-term food storage scenarios may be restricted unless additional protection is applied.
How to Optimize Pulp Molded Tray Properties
AGICO is a pulp molding machniery and technology provider for various pulp molding solutions. With advancements in egg tray machine technology and material processing, many of these limitations can be effectively addressed.
Coating and Surface Treatment Technologies
By applying surface treatment of PLA biodegradable waterproof coatings and oil-resistant surface layers, molded pulp products can now be adapted for soup-containing food boxes and ready-to-eat meal packaging.
Structural Reinforcement and Material Upgrades
AGICO also provide pulp molding technology of composite fiber reinforcement and structural thickening and rib optimization, Egg tray production lines from AGICO can manufacture molded pulp products suitable for Heavy-duty fresh food trays and high-load food packaging applications.
Although these enhancements increase production costs, they significantly expand the application scope of molded pulp packaging in the food industry.
Balancing Performance & Cost in Your Pulp Molded Tray Production
The physical properties of molded pulp products form the foundation of their application in the food packaging field. With the continuous development of egg tray machines, egg tray production technology, and material optimization methods, molded pulp packaging has evolved from simple protective trays to high-performance, sustainable food packaging solutions.
By selecting the right egg tray machine configuration, material formulation, and surface treatment process, manufacturers can balance performance, cost, and environmental sustainability, meeting the diverse demands of modern food packaging markets.