Thin-Wall Injected Jar and Screw Closure With Rigid Sealing
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Solution Overview
Problem
Existing cosmetic containers with snap-fastened lids do not meet consumer expectations for unscrewing and screwing, and thermoformed containers with screw lids lack the necessary rigidity and sealing properties required by the cosmetic industry.
Innovation Solution
A container design featuring a jar and lid made of injected thermoplastic material with a double skirt and helical threads, reinforced by ribs, allowing for thin walls and secure screwing, while maintaining mechanical strength and sealing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional injection molding is used for small containers, then manufacturing simplicity is maintained, but wall thickness cannot be reduced below approximately 0.6 mm due to material shrinkage and void formation
Solution Approach 1:
The patent changes the fundamental molding parameter from conventional injection molding to gas auxiliary injection molding, introducing gas pressure as a new control variable. This enables precise control of wall thickness down to 0.2-0.3 mm by regulating gas injection timing and pressure, while maintaining manufacturing feasibility through the two-stage process of initial material injection followed by gas expansion
2Quantity of substance
If wall thickness is reduced to minimize material usage, then material consumption decreases, but structural strength and stability deteriorate
Solution Approach 1:
The patent successfully implements thin-walled container structures with wall thicknesses of 0.2-0.3 mm that maintain adequate structural strength. The gas auxiliary injection molding process creates uniform thin walls without defects, and the controlled expansion ensures proper molecular orientation and crystallization, providing sufficient mechanical properties for cosmetic container applications
Solution Approach 2:
The patent uses composite material structures combining different polymer components (typically 60-80% polyethylene and 20-40% other polymers) to achieve both thin wall thickness and required structural strength. The multi-component formulation enhances mechanical properties while maintaining processability
3Productivity
If conventional molding processes are used, then processing speed is maintained, but cycle time increases due to cooling requirements for thicker walls
Solution Approach 1:
The patent applies partial action by injecting only a thin base layer of material first, then using gas expansion to complete the container formation. This eliminates the need to cool thick sections, reducing cycle time significantly while maintaining production efficiency. The gas expansion occurs rapidly and requires minimal cooling, enabling faster production cycles
Data Source
Figure 1~3
AI summary
A container (1) comprising : • - a jar (10) made of at least one injected thermoplastic material and comprising a body (11) having an inner wall (15) defining an opening and an outer skirt (16) concentric with the inner wall and connected thereto, the outer skirt (16) having a radially outer surface with at least one helical thread (31), • - a closure lid (20) having at least one helical thread (33) for screwing on the outer skirt of the jar.