Tethered Container Cap Cutting for Durable Acute-Angle Tethers
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Solution Overview
Problem
Manufacturing tethered container caps with non-right-angled transition points is challenging due to the need for unique molds and high costs, and existing methods are inefficient and complex, especially for standardized caps like PCO 1881 28 mm plastic beverage closures.
Innovation Solution
A system and method using a cap holding assembly, blade stack, and rotation assembly to cut tethers with transversal blades at acute angles, allowing for efficient production of tethered container caps with non-right-angled transition points, utilizing interchangeable and adjustable components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-mold slitting is used to create non-right-angled tethers, then tether durability is improved, but manufacturing complexity and cost increase due to unique molds required for each cap type
Solution Approach 1:
The manufacturing process is segmented into two independent stages: (1) standard mold production of caps with right-angled slits, and (2) post-molding blade stack processing to create the final non-right-angled tether configuration. This segmentation allows the mold to remain simple and standardized while the complex tether geometry is achieved through the blade stack assembly.
Solution Approach 2:
The cap is pre-formed in the mold with basic slit features, and then the blade stack performs the final shaping action to create non-right-angled transitions. This preliminary action in the mold reduces the complexity requirements for the mold itself while achieving the desired final geometry through subsequent processing.
2Adaptability or versatility
If post-molding slitting is used to create non-right-angled tethers, then manufacturing versatility is improved, but production time and complexity increase
Solution Approach 1:
Multiple blade functions are merged into a single blade stack assembly that performs multiple cutting operations simultaneously. The blade stack includes variously positioned and angled blades that can create different tether configurations in one integrated processing step, reducing the need for multiple separate operations.
Solution Approach 2:
The blade stack is designed as a universal tool that can produce multiple types of non-right-angled tethers by adjusting blade positions and angles. A single blade stack configuration can accommodate different cap types and tether designs, providing manufacturing versatility without requiring unique equipment for each product variant.
3Strength
If standardized caps are modified to include non-right-angled tethers, then tether strength is improved, but manufacturing cost increases due to additional processing steps
Solution Approach 1:
The complex non-right-angled tether geometry is extracted from the mold-making process and placed into the post-molding blade stack processing. This extraction allows the use of simple, standardized molds for cap production while the value-added tether strengthening feature is added through a separate, optimized processing step.
Solution Approach 2:
The blade stack uses replaceable, relatively simple cutting blades that can be worn or damaged during operation. These blades are easier and cheaper to replace than investing in complex custom molds, making the process more cost-effective for producing strengthened tethers on standardized cap platforms.
Data Source
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AI summary
Systems and methods are provided for making tethered container caps. In one embodiment, the system includes: a cap holding assembly (58) having an internal tool (62) configured to be disposed within the container cap and to support a skirt of the container cap; a blade stack (20) comprising a given set of stacked segments including a transversal blade (36) configured to cut a transversal cut (18) in the skirt of the container cap to provide, in use, a tether (8) connecting an upper skirt portion (12) of the container cap and a retaining ring (6); and a rotation assembly (60) configured to move the cap holding assembly (58) relative to the blade stack (20), such that the blade stack cuts the container cap to from the retaining ring (6) and tether (8).