Two Shot Molded Spout Closure With Overmolded Cap
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Solution Overview
Problem
Existing container closure technologies face inefficiencies in manufacturing, particularly in the assembly and sealing of spout and base components, where separate molding processes lead to a reliance on friction fits for cap attachment, lacking a secure and tamper-evident solution.
Innovation Solution
A method involving a two-shot injection molding process where the spout and base are molded in one step, and a repositionable cap is overmolded in a second step, creating a secure fluidic seal and tamper-evident indicia through color changes upon opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate molding processes are used for base and spout components, then manufacturing flexibility is maintained, but assembly complexity and reliance on friction fits increase
Solution Approach 1:
The patent merges the base and spout components into a single integrated molding process, eliminating the need for separate assembly operations. The base portion and spout portion are formed as one unitary structure through a single injection molding operation, directly reducing assembly complexity while maintaining manufacturing flexibility.
Solution Approach 2:
The patent segments the closure system into distinct functional zones within a single molding process. The base portion, spout portion, and circumferential groove are all formed in separate regions of the mold cavity, allowing for specialized material selection and processing in each zone while maintaining overall integration.
2Ease of operation
If friction fit is used to mount cap to spout portion, then cap attachment is achieved, but sealing reliability and tamper evidence are insufficient
Solution Approach 1:
The patent replaces the mechanical friction fit system with a chemical bonding system. An adhesive layer is applied to the circumferential groove to create a bonded connection between the base portion and the cap, providing both secure attachment and reliable sealing that prevents tampering while maintaining ease of operation.
Solution Approach 2:
The patent creates a composite structure combining the base portion, spout portion, and cap through adhesive bonding. This composite assembly integrates multiple materials and components into a unified structure that provides both mechanical attachment and sealing functions simultaneously.
3Adaptability or versatility
If multiple separate molding steps are used for base and cap, then component customization is possible, but manufacturing time and costs increase
Solution Approach 1:
The patent performs preliminary preparation of the mold cavity and positioning of components before the final molding operation. The base portion and spout portion are pre-formed with the circumferential groove in specific positions, and the cap is pre-positioned, allowing all components to be customized independently while being assembled in a single integrated molding step that maximizes manufacturing efficiency.
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
This approach enhances manufacturing efficiency, provides a secure and tamper-evident closure system with visual indication of seal integrity, and reduces handling and costs by integrating the cap and base in a single molding process.
Implementation Method 1
injecting a first material into the first cavity to mold the base
Implementation Method 2
cooling the first material in the mold to impart at least minimal rigidity to the base
Data Source
AI summary
A two shot dispensing closure wherein the spout and base component of the closure is molded in a first molding step and a repositionable cap is molded over at least the spout of the closure in a second molding step. The cap may be molded in the closed position over the spout to provide a fluidic seal between the cap and spout. The cap is repositionable between a closed position closing off an aperture of the spout and an open position thereby opening the aperture of the spout.