Vial Capping Load Cell Force Control
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Solution Overview
Problem
Existing capping and sealing apparatus for vials rely on mechanical and dimensional driving, which results in inconsistent sealing due to variations in vial height within the tolerance range, leading to inadequate sealing of some vials.
Innovation Solution
A capping and sealing apparatus that uses a load cell to determine the desired force applied to the cap assembly, with a sealing head assembly featuring spring-biased rollers that rotate in a planetary motion to crimp the ferrule into place, ensuring a consistent seal regardless of vial height variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical and dimensional driving is used to compress the vial into the pressure block, then the sealing force is applied, but variations in vial height within tolerance range cause inconsistent sealing quality
Solution Approach 1:
The patent replaces the mechanical/dimensional driving system with an electronic control system using a load cell to sense applied force and electronic circuitry to control the platen movement. This substitution allows precise control of sealing force independent of vial height variations, resolving the contradiction between sealing consistency and accommodation of dimensional variations.
Solution Approach 2:
The load cell provides real-time feedback on the force applied to the vial during sealing. The electronic circuitry receives this feedback signal and uses it to control the platen movement, ensuring that the predetermined sealing force is achieved regardless of vial height variations. This feedback mechanism directly addresses the inconsistency problem.
2Manufacturing precision
If a load cell and electronic control system are introduced, then sealing consistency is improved, but device complexity increases
Solution Approach 1:
While introducing electronic components, the patent maintains a relatively simple overall structure by replacing only the force control mechanism with electronic elements. The load cell and basic electronic circuitry provide precise control without requiring complex multi-component systems, thus achieving improved sealing consistency with moderate complexity increase.
3Ease of manufacture
If the vial is compressed a fixed distance into the pressure block, then the sealing process is simple, but inadequate sealing occurs for vials at the extremes of height tolerance
Solution Approach 1:
The patent replaces the fixed-distance mechanical compression approach with an electronic control system that uses load cell feedback to control platen movement. This substitution maintains ease of manufacture through automated control while significantly improving reliability by ensuring adequate sealing force for all vials within tolerance range, including those at height extremes.
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
The apparatus ensures consistent sealing of vials by eliminating variations in force application, allowing for perfect sealing even with vials of varying heights, as the load cell and electronic circuitry control the sealing process to apply a predetermined force and trigger the rollers for crimping.
Implementation Method 1
a load cell (34) to determine when a desired amount of force has been applied to the cap assembly
Implementation Method 2
a sealing head assembly (26) featuring spring-biased rollers (32) that rotate in a planetary motion to crimp the ferrule into place
Data Source
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AI summary
An apparatus (20) and a method for capping and sealing a vial with a cap assembly including a deformable annular seal, e.g., a ferrule, is disclosed. The apparatus (20) comprises a base (24) for holding the vial, a pressure applying platen (38), plural sealing rollers (32) and associated electronic circuitry and motors. The platen (38) is arranged to be moved relative to the base (24), whereupon it engages and applies a force to the cap assembly. A load cell (34) measures the force applied and provides a signal indicative thereof to the electronic circuitry. The electronic circuitry determines when a desired amount of force has been applied to control the operation of the rollers (32), whereupon the rollers apply a force to the annular seal to permanently crimp the annular seal on the vial.