Plastic Bin Injection Mold Core Stability
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Solution Overview
Problem
Cup-shaped plastic bins face issues with premature failure due to weak points at the top edge, caused by uneven plastic flow and high injection pressures, leading to unnecessary thick wall thicknesses for stability during handling.
Innovation Solution
Implementing multiple injection points on the bottom of the plastic bin, with at least two points arranged off-center, allowing independent control of plastic flow to each wall, thereby stabilizing the injection mold core and optimizing wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single central injection point is used, then the injection mold structure is simple, but the plastic flow becomes uneven causing weak points at the top edge and requiring thicker wall thickness for structural integrity
Solution Approach 1:
The single central injection point is divided into multiple injection points (at least two) arranged on the bottom surface of the mold cavity. This segmentation allows independent control of plastic flow to different walls, ensuring uniform flow distribution and eliminating weak points at the top edge while maintaining structural integrity with optimized wall thickness.
Solution Approach 2:
Different regions of the bottom surface are assigned different injection points with independent flow control. This allows each wall to receive plastic flow according to its specific requirements, achieving uniform flow distribution across all walls while preventing premature failure at the top edge.
2Strength
If wall thickness is increased to ensure strength, then structural integrity during handling is improved, but the plastic bin becomes heavier and less efficient
Solution Approach 1:
The injection process uses controlled plastic flow from multiple injection points to achieve uniform distribution. This hydraulic control of the injection process ensures that the plastic fills the mold cavity evenly, eliminating weak points and allowing for optimized, thinner wall thickness that maintains strength while reducing weight.
3Manufacturing precision
If multiple injection points are used, then plastic flow uniformity and structural integrity are improved, but the injection mold complexity increases
Solution Approach 1:
The injection system is segmented into multiple independent injection points on the bottom surface, each capable of independent flow control. This segmentation achieves uniform plastic flow distribution to all walls while the modular bottom-surface arrangement keeps the overall mold structure manageable and not excessively complex.
Data Source
AI summary
The barrel (1) has walls (3) extended from bottom (2) to an upper edge of the barrel, where height of the walls is larger than breadth or depth of the bottom of the barrel. The bottom and the walls form a common injection mold component, and two injection points (7) are provided at the bottom. Axle supports (4) for an axle are provided close to the bottom of the barrel with running wheels. A hinge axle (6) serving hinge-like attachment of a cover is used as a handle of the barrel and provided at an upper end of each wall.