Thermoformed Clamshell Container Locking Mechanism
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Solution Overview
Problem
Existing packaging container manufacturing methods lack a secure and easy-to-open closure mechanism, which compromises the integrity and usability of clamshell-type containers.
Innovation Solution
A thermoforming process that creates a clamshell locking system with a hinged mechanism, utilizing a punch and die mechanism to form a post and aperture system, allowing for secure closure and easy opening by depressing a deformable flange, while maintaining the structural integrity of the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure mechanism is added to secure the container, then the security and integrity of the container is improved, but the device complexity increases
Solution Approach 1:
The closure mechanism is integrated directly into the container body by forming the locking protrusion and aperture features during the thermoforming process itself, rather than adding separate components. The hinge and locking features are combined into a single integrated assembly that secures the closure to the container wall.
Solution Approach 2:
The closure mechanism serves multiple functions: it secures the container closure, provides a hinged opening mechanism, and includes locking features that prevent accidental opening. The same structural elements perform both closure and locking functions, reducing the need for additional separate components.
2Manufacturing precision
If a thermoforming process with multiple stages is used, then the manufacturing precision and structural integrity are improved, but the productivity decreases
Solution Approach 1:
The mold is pre-configured with all necessary forming surfaces, including the hinge cavity, locking protrusion features, and aperture shapes. The mold design incorporates pre-formed geometries that guide the thermoforming process to create precise features in a single operation, eliminating the need for subsequent assembly steps.
Solution Approach 2:
The thermoforming process controls temperature, pressure, and time parameters to optimize the forming of complex geometries. By carefully controlling these parameters, the process achieves high precision in creating the hinge and locking features while maintaining efficient production cycles.
3Manufacturing precision
If a punch and die mechanism is used to create apertures and projections, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The punch and die mechanism is integrated into the existing thermoforming equipment, combining the aperture-forming function with the container forming process. The same equipment that forms the container body also creates the locking features and apertures through integrated tooling, rather than requiring separate dedicated machines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a secure closure mechanism that is easy to open, ensuring the container's integrity during transportation and use, while being manufacturable through a process involving heating, forming, punching, and trimming stages.
Implementation Method 1
Heating involves raising the temperature of the thermoplastic sheet so that it may be drawn into the desired shape during molding
Implementation Method 2
The projection is released from the outer aperture by depressing the deformable flange and applying inward force to the outer wall segment of the base section
Data Source
AI summary
An apparatus and method for manufacturing a container with a closure-release mechanism. The process in particular relates to thermoforming a plastic sheet to form a container with a clam shell locking system in order to facilitate a secure closure and easy opening packaging container. The clam shell locking arrangement comprises a post which is secured in an aperture when the container is in closed state. The post is a projection or protrusion in a vertical or nearly vertical sidewall of the cover of the thermoformed package and fits securely into the aperture, which is a cut-out made in the outer, and optionally also the inner, wall segments of the vertical or nearly vertical surfaces of the base section of the thermoplastic containers.