Large & Complex:
The pallets themselves are large (common sizes like 1200x800mm, 1200x1000mm, etc.) and feature complex structures (grids, reinforcing ribs, support feet, anti-slip nubs, etc.). Consequently, the molds are typically massive, structurally intricate, and very heavy.
Hot Runner System:
To enhance production efficiency, reduce runner scrap (sprue waste), and improve plastic part quality, large pallet molds universally employ hot runner systems.
Cooling System:
Cooling system design is crucial. Due to the large pallet volume and relatively thick walls, efficient and uniform cooling channel design is essential to ensure rapid cooling, uniform shrinkage, prevent warpage, and shorten the molding cycle.
Ejection System:
A powerful and evenly distributed ejection mechanism (ejector pins, ejector pads, etc.) is required to reliably eject the large, formed pallet from the mold.
Venting System:
Effective venting design prevents issues like trapped air, burning (dieseling), and short shots, particularly in complex rib areas and corners.
Wear Resistance:
Given the extremely high production volumes (hundreds of thousands, even millions of cycles), the mold steel (especially for critical components like cavities, cores, sliders, and ejector pins) requires high hardness and excellent wear resistance (e.g., pre-hardened steel, quenched and tempered steel).
