Packaging Seal Injection Molding with In-Mold Cap Closure
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Solution Overview
Problem
Current injection molding processes for packaging seals with hinged connections require manual handling and cooling, leading to increased manufacturing time, costs, and material fatigue, which compromises the seal's strength and productivity.
Innovation Solution
The process involves a mold with a fixed and moving part, where the cap is closed mechanically during injection, using compressed air to position the cap on the frame before the material cools, eliminating manual handling and ensuring the hinged connection is formed without stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seal is injected open and manual closing is performed after injection, then the hinge connection can be formed, but the manufacturing time increases and productivity decreases
Solution Approach 1:
The cap is closed on the frame during the injection molding process itself, before the seal is ejected from the mold. This preliminary closing action eliminates the need for subsequent manual handling and closing operations, thereby increasing productivity while maintaining ease of manufacture through automated in-mold closure
2Productivity
If the cap is closed after leaving the injection mold, then the seal can be ejected, but the plastic has cooled and bending the hinge generates stresses causing material fatigue and quicker breaking
Solution Approach 1:
The cap closing action is performed while the seal is still in the mold and the plastic material is in a softened state. This preliminary closing prevents the formation of stresses in the hinge connection that would occur if closing were delayed until after ejection and cooling, thereby maintaining reliability without sacrificing productivity
Solution Approach 2:
The closing action is performed at a specific temperature parameter window - while the plastic is still warm and pliable but before it fully cools. This parameter control ensures the hinge bends without generating excessive stresses, preventing material fatigue and extending the service life of the seal
3Ease of operation
If manual handling is used for closing the seal, then the process is flexible, but sanitary control tasks increase and manufacturing costs increase
Solution Approach 1:
The seal performs its own closing action through the in-mold mechanism, eliminating the need for external manual handling. The cap automatically closes on the frame during injection, and the seal ejects itself from the mold in the closed position, thereby reducing sanitary control requirements and overall device complexity while maintaining operational ease
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 results in a fully automated process that reduces production time and costs, enhances seal strength by avoiding material stress, and meets sanitary standards without additional handling protocols.
Implementation Method 1
using compressed air to position the cap on the frame before the material cools
Data Source
Figure 1.1
Figure 1.2
Figure 2.1
AI summary
Process for manufacturing the seal (1) for packaging by injection, that consists of a frame (8) connecting to the packaging, a cap (9), a hinged connection (10), coupling and inviolability means, with the following phases: closure of the mould (2), forming a moulding space (11) with the cap (9) open and located on the frame (8) in the same vertical plane; injection of the seal (1); pre-expulsion of the seal (1) from the fixed part (2.1); opening of the mould (2); freeing of the cap (9) from the moving part (2.2) and its descent on the frame (8) through the impulsion of compressed air (14); and expulsion of the seal (1) and collection by an expulsion robot that presses the cap (9) on the frame (8), closing the coupling and inviolability means.