Cap Transfer Unit With Movable Pusher Prevents Sterilization Damage
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Solution Overview
Problem
The existing cap transfer systems in the container industry face challenges in maintaining cap reliability and preventing damage due to interruptions in cap flow, such as upstream jams or hopper emptiness, which can lead to caps being exposed to sterilization agents for extended periods, causing surface attack and potential damage.
Innovation Solution
A cap transfer unit with a star wheel and a cap pusher mechanism that senses flow interruptions, allowing the cap pusher to actively move caps from the loading area to the discharge area, ensuring continuous cap movement and preventing cap jamming, even when the upstream flow is halted, thereby reducing the risk of cap damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap transfer line uses a transfer wheel with controlled rotational speed to maintain horizontal cap transfer through the sterilization chamber, then the caps are sterilized effectively and the transfer is controlled, but when caps are missing upstream the caps standing along the transfer path are stopped leading to cap damage from extended exposure to sterilization agents
Solution Approach 1:
The patent replaces the traditional transfer wheel mechanism with a belt-driven system. The belt conveys caps horizontally through the sterilization chamber without requiring a rotating wheel, eliminating the problem of caps being left stationary when upstream supply is interrupted. The belt continuously moves through the chamber, ensuring caps are constantly transported rather than held in place, thus preventing damage from extended sterilization agent exposure.
Solution Approach 2:
The invention introduces a dynamic belt system that can continuously adjust its movement through the sterilization chamber. Unlike a fixed-speed transfer wheel, the belt system can vary its speed and can be stopped or reversed as needed, allowing flexible response to upstream cap availability while maintaining continuous motion through the sterilization zone to prevent cap damage.
2Productivity
If the cap transfer line moves caps quickly to match high capping rates of several tens of thousands units per hour, then productivity is improved, but the caps may not receive sufficient sterilization time and could be damaged by hot hydrogen peroxide
Solution Approach 1:
The patent implements periodic acceleration and deceleration zones along the belt path. Caps are accelerated to high speeds for rapid transport through non-sterile zones, then decelerated to slower speeds within the sterilization chamber to ensure adequate exposure time to hydrogen peroxide, then accelerated again for the return journey. This periodic variation in speed allows high overall productivity while maintaining proper sterilization timing.
Solution Approach 2:
The invention changes the velocity parameter of cap transport dynamically along the transfer path. The belt system varies cap speed according to the specific zone being traversed - high speed for productivity-critical sections, low speed for sterilization-critical sections. This parameter adjustment allows the system to simultaneously achieve high capping rates and effective sterilization quality.
Data Source
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AI summary
A cap transfer unit (1 ) comprising a cap transfer line (8) defining a transfer path (5) from a cap loading area (4) to a cap discharge area (6), and a cap pusher (16) slidingly mounted along the cap transfer line (8), the cap pusher (16) having a rest position in which the cap pusher (16) is spaced from the transfer path (5), and an active position in which the cap pusher (16) overlaps at least partially the transfer path (5) for coming into abutment with caps (2) located therein.