Disposable Ejection Device Manufacturing via Injection Molding
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Solution Overview
Problem
Existing ejection devices for liquid or pasty products are complex, costly to produce, and unsatisfactory in terms of hygiene, with difficult cleaning and sterilization due to intricate designs and multiple parts.
Innovation Solution
A method involving three stages of injection molding to form distinct parts of the device, including a lever with a pawl, a container holder, and a rear body, with an irreversible assembly step to create a ready-to-use ejection device using a pull tab and a rack mechanism for efficient product ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex multi-part structures with angles and corners are used to achieve functional requirements, then device functionality is improved, but manufacturing cost increases and cleaning/sterilization becomes difficult
Solution Approach 1:
The patent combines multiple functional parts (container holder, rear body, lever with pawl, rack mechanism) into a single integrated ejection device manufactured by injection molding. This merging eliminates the need for separate assembly of multiple components, reducing manufacturing complexity and cost while ensuring all surfaces are smooth and easily cleanable without angles or corners that trap contaminants.
Solution Approach 2:
The ejection device is designed as a universal, multi-functional unit that integrates product containment, ejection mechanism, and actuation system into one component. The single-piece construction performs multiple functions (holding product, enabling ejection through rack-and-pawl mechanism, and facilitating cleaning) without requiring separate parts, thereby improving both functionality and ease of manufacture.
2Ease of operation
If removable articulated lever with pawl is used to facilitate cleaning, then ease of cleaning is improved, but device efficiency deteriorates due to less secure hold under significant ejection forces
Solution Approach 1:
The lever with pawl is permanently integrated into the rear body as a single molded component, eliminating removable connections. This integration ensures the lever maintains a secure, play-free connection that can withstand significant ejection forces, while the entire device remains easily cleanable due to its smooth, angle-free construction.
3Ease of operation
If pre-assembly is required before distribution, then ease of use is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The entire ejection device including container holder, rear body, lever with pawl, and rack mechanism is manufactured as a single integrated unit through injection molding. This eliminates all pre-assembly requirements, allowing the device to be distributed in ready-to-use form while reducing manufacturing complexity and cost compared to assembling multiple separate components.
Data Source
AI summary
Method of manufacturing a device for ejecting a liquid or pasty product, characterized in that it comprises the following steps: drawing a product (11) to be ejected within a volume (10) of a container holder (2a) of the ejection device by means of a pull rod (18); removing the pull rod (18) from the container holder (2a); assembling a rear body (2b) on the container holder (2a) in order to form the ejection device.