Reinforced Trunk Frame Assembly for Rigid Yet Flexible Edges

The patent combines multiple separate forming processes into a single integrated die structure that can form different trunk components (such as the body and branches) in one operation. The die includes multiple cavities and injection channels that enable simultaneous formation of different components, thereby maintaining high precision while significantly improving manufacturing efficiency and reducing process complexity.

The patent segments the injection system into multiple independent injection channels, each equipped with its own injection hole and control mechanism. This allows independent control of injection pressure and flow rate for each cavity, ensuring precise pressure control even in complex multi-cavity configurations. The segmented approach prevents short shots by enabling individual adjustment of each injection path while maintaining high productivity.

The patent employs a nested die structure where smaller cavities are positioned within or adjacent to larger cavities, allowing efficient use of the die space. This nesting arrangement enables the formation of multiple components in a single molding cycle, reducing material consumption by eliminating the need for separate molding operations and subsequent assembly. The integrated approach also reduces assembly complexity while maintaining manageable process control through the use of standard injection molding parameters.