When configuring equipment for a molded pulp production line, one of the most practical engineering questions is: what is the thickness range of trays from an egg tray machine? A standard industrial egg tray machine typically produces trays with a thickness ranging from 0.8 mm to 4.0 mm, although most common egg trays fall between 1.0 mm and 2.5 mm. The exact thickness achievable by an egg tray machine depends on the mold design, pulp consistency, vacuum pressure, and the specific type of raw material used. Understanding these variables is crucial for meeting the load-bearing requirements of different packaging applications.
The thickness of a tray is primarily determined by the forming mold cavity depth. During operation, the egg tray machine's forming mold dips into the pulp slurry, and vacuum suction pulls the fibers against the mold surface. The deeper the mold cavity, the thicker the final product. For standard 30-cell chicken egg trays, a thickness of 1.2 mm to 1.8 mm is sufficient for stacking and transport. However, for heavier items like bottle dividers or industrial packaging, the egg tray machine must be configured to produce trays closer to 3.0 mm to 4.0 mm to prevent deformation under weight.
Pulp consistency and vacuum pressure also play vital roles. A higher pulp consistency (more fibers per liter of water) will deposit a thicker layer on the mold, increasing the tray thickness. Similarly, stronger vacuum suction ensures more fibers are pulled onto the mold rather than draining away. Operators must calibrate these settings on the egg tray machine to maintain uniformity; inconsistent thickness often indicates fluctuating vacuum levels or clogged mold holes.
The type of waste paper used affects the achievable thickness as well. Long fibers from corrugated cardboard allow the egg tray machine to form thicker, denser trays, whereas short fibers from newsprint result in thinner, less rigid products. Furthermore, the drying process impacts the final dimension. Thermal drying (using a metal dryer) can slightly compress the tray, reducing thickness by 5–10%, while natural sun drying retains more of the original loft.
In summary, a modern egg tray machine offers a versatile thickness range of 0.8 mm to 4.0 mm. By adjusting the mold depth, vacuum suction, and pulp density, operators can customize the output to meet specific load requirements-from lightweight egg packaging to heavy-duty industrial cushioning. Always verify the mold specifications with your egg tray machine manufacturer to ensure they align with your target product dimensions.