Cap Seal Verification via Capacitive Current Integration
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Solution Overview
Problem
Existing methods for controlling the sealing of caps on containers in aseptic bottling lines are inefficient, often requiring destructive tests and cannot accurately distinguish between micro-holes that allow microorganisms to enter and those that maintain aseptic conditions, leading to incorrect discarding of containers and high operational costs due to complex electronics and energy consumption.
Innovation Solution
A method and apparatus that uses dynamic current diagnostics through capacitive couplings between electrodes and the liquid inside the container, applying voltage pulses to detect micro-holes between the cap and container, with a logic control unit to integrate current measurements and discriminate suitable from unsuitable seals, allowing non-destructive, efficient, and accurate aseptic condition verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is applied between two electrodes to detect micro-holes by measuring current passages, then sealing verification is achieved, but micro-holes of negligible dimensions are incorrectly identified as defects leading to false discarding of containers
Solution Approach 1:
The patent changes the electrical parameters by applying high voltage pulses (kilovolt range) instead of continuous low voltage, and by controlling the pulse duration and frequency. This allows detection of actual sealing defects while filtering out noise from negligible micro-holes, as the high voltage pulse creates a distinct current signature only when true communication paths exist between electrodes.
Solution Approach 2:
The patent uses periodic voltage pulses instead of continuous voltage application. The pulsed nature of the measurement allows the system to distinguish between transient current fluctuations (from negligible micro-holes) and sustained current passages (from actual sealing defects), thereby improving the reliability of container acceptance decisions.
2Measurement precision
If destructive tests are used to verify sealing, then accurate detection of seal defects is achieved, but production time is lost and containers cannot be reused
Solution Approach 1:
The patent replaces mechanical destructive testing methods with an electrical measurement system. By applying voltage pulses and measuring current passages through the cap-sealing-container interface, the system achieves accurate seal defect detection without physically damaging the container, allowing continuous operation of the bottling line and maintaining high productivity.
3Measurement precision
If complex electronics systems are used for sealing control, then measurement accuracy is improved, but energy consumption and operational costs increase
Solution Approach 1:
The patent employs periodic voltage pulses instead of continuous power supply. The pulsed measurement system consumes energy only during the brief pulse duration, significantly reducing overall energy consumption compared to continuous monitoring systems, while still achieving high measurement accuracy through the high voltage pulse technique.
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
Enables reliable and efficient discrimination of containers with aseptic sealing from those without, reducing operational costs and improving accuracy in maintaining aseptic conditions, while being versatile for different container types and easy to install, maintain, and calibrate.
Implementation Method 1
A pulse generator (10) is provided for applying between the first electrode (6) and the second electrode (7) voltage pulses suitable to generate at the first electrode (6) an electrical field of intensity greater than the dielectric rigidity of the air interposed between the liquid and the first electrode (6), thus generating currents which traverse at least one possible micro-hole
Implementation Method 2
voltage pulses suitable to generate at the first electrode (6) an electrical field of intensity greater than the dielectric rigidity of the air
Implementation Method 3
measuring possible currents which starting from the first electrode (6) traverse the micro-holes present between the cap (2) and the opening of the container (3) before closing on the second electrode (7) after traversing the interposed liquid
Data Source
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AI summary
Method for controlling the sealing of a cap on a container, such comprises the following operating steps: - a first step of at least partly tilting a container (3) carrying mounted a cap (2) arranged to close the opening thereof and containing a liquid for human consumption therein with conductivity exceeding 0.5 µS/cm; the container (3) is arranged in a at least partly capsized position (R) in which it wets with the liquid for human consumption contained therein the cap (2) the widened portion (8) of the container (3); - a first step of associating to the container (3) a first electrode (6) having a first capacitive coupling (C1) with the container (3) at the cap (2); - a second step of associating to the container (3) a second electrode (7) having a second capacitive coupling (C2) with the container (3), at the widened portion (8) thereof spaced from the cap (2); - a step of generating voltage pulses between the electrodes (6, 7); - a step for measuring the currents between the electrodes (6, 7) due to the abovementioned voltage pulses; - a step for calculating, by means of a logic control unit, the current integrals generated by the voltage pulses; - a discrimination step, which selects, by means of the logic control unit, values of current integrals exceeding a preset threshold value produced by the currents between the abovementioned electrodes (6, 7) passing through micro-holes present between the cap (2) and the opening of the container (3), to discriminate faulty containers (3) from containers (3) with aseptic sealing; - a second step of tilting the container (3) from at least partly capsized position (R) to a straight position (D).