Closure Cap Injection Tool With Oblique Sliding-Jaw Ejection
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Solution Overview
Problem
Existing plastic injection tools struggle to efficiently produce closure caps with complex three-dimensional contours and undercuts, particularly those with movable cap covers, due to limitations in the design of sliding jaw tool parts and ejection mechanisms.
Innovation Solution
The tool design incorporates sliding jaw tool parts with different partial injection contours that allow for oblique movement during ejection, enabling precise and cost-effective production of closure caps with complex geometries, including movable cap covers and tamper indicating bands, by ensuring contact regions are spaced apart in the ejection direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If sliding jaw tool parts with identical partial injection contours are used, then the tool structure is simple and manufacturing is easy, but the ability to produce complex three-dimensional contours and undercuts is limited
Solution Approach 1:
The injection tool is divided into multiple sliding jaw tool parts (at least two), each responsible for forming a specific portion of the complex cap body geometry. This segmentation allows each tool part to have a specialized partial injection contour tailored to specific undercut regions or three-dimensional features, enabling production of complex shapes while keeping individual tool parts manageable in complexity
Solution Approach 2:
Different sliding jaw tool parts are assigned different partial injection contours that match specific local requirements of the cap body. Each tool part's contour is optimized for its specific function (e.g., forming undercuts, creating specific surface features), allowing precise control over complex geometries without requiring all tool parts to be identical or overly complex
2Shape
If sliding jaw tool parts move only in the ejection direction, then the ejection mechanism is simple, but the ability to release complex geometries with undercuts is insufficient
Solution Approach 1:
The sliding jaw tool parts are designed with dynamic movement capabilities that combine ejection direction motion with perpendicular motion (rotational or lateral). This dynamic movement allows the tool parts to navigate complex undercut geometries and release the cap body effectively, while the coordinated motion mechanism maintains operational simplicity through standardized guides and actuators
3Productivity
If contact regions of sliding jaw tool parts are closely spaced in the ejection direction, then the tool structure is compact, but the ejection process becomes complex and less reliable
Solution Approach 1:
The sliding jaw tool parts are positioned and oriented in advance during tool closure, with contact regions spaced apart in the ejection direction. This preliminary arrangement ensures that during ejection, each contact region can independently and effectively engage with corresponding features on the cap body, simplifying the ejection process and improving reliability without requiring complex real-time coordination
Data Source
AI summary
A plastic injection tool for producing a closure cap is divided into first and second mold halves that can be moved relative to one another and an injection nozzle is formed in the first mold half, and sliding jaw tool parts are formed in the second mold half, radially outside a central tool core, which can simultaneously be moved in an ejection direction of the produced closure cap and perpendicular to the ejection direction. A respective partial ejection contour of the cap body is formed in the sliding jaw tool parts. An ejector is also provided for ejecting the produced closure cap. Partial injection contours that are different from one another are formed in sliding jaw tool parts, and a sliding jaw tool part is in contact with the tool core in two regions lying after one another in the ejection direction, before the ejection of the closure cap.