Electrostatic Charging Current Feedback for In-Mold Labeling Cycle Time
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Solution Overview
Problem
In the 'in mold labeling' (IML) process, electrostatic charging of non-conducting objects requires longer production cycle times due to the need for safety margins in ambient conditions like temperature and humidity, which is contrary to achieving minimal cycle times.
Innovation Solution
The method involves measuring the charging current during each cycle and parameterizing the charging cycles based on ambient conditions, allowing for optimal adaptation without additional sensors, and includes adjusting the high charging voltage and cycle end parameters to minimize cycle time while ensuring reliable attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety margins are added to charging cycles to ensure reliable attachment under unfavorable ambient conditions, then reliability is improved, but production cycle time increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the charging current and using it to adjust the charging cycle parameters in real-time. The charging current serves as a feedback signal that reflects the actual charging state and ambient conditions, allowing the system to dynamically optimize the cycle time without compromising attachment reliability.
Solution Approach 2:
The patent transforms the static, fixed charging cycle into a dynamic process that adapts to changing ambient conditions. By parameterizing the charging cycles based on measured charging currents, the system can adjust cycle duration, voltage levels, and other parameters dynamically, eliminating the need for conservative fixed safety margins while maintaining reliable attachment.
2Device complexity
If fixed charging cycle parameters are used to simplify control, then device complexity is reduced, but adaptability to ambient conditions deteriorates
Solution Approach 1:
The patent enables the charging system to self-adjust by using the charging current itself as the basis for parameterization. The system automatically adapts to ambient conditions through intrinsic feedback from the charging process, eliminating the need for external sensors or complex control algorithms while maintaining high adaptability.
Solution Approach 2:
The patent changes the operating parameters of the charging cycle based on the measured charging current. By parameterizing voltage, time, and other charging characteristics according to the actual current draw, the system achieves adaptability to varying ambient conditions without requiring complex decision-making logic or additional sensing infrastructure.
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 allows for significantly reduced production cycle times by optimizing charging cycles to prevailing ambient conditions, ensuring reliable electrostatic attachment without increasing cycle duration.
Implementation Method 1
The charging takes place in the manner of an ionizer, in that the voltage supplying device applies to an electrode arranged on the mold core a high charging voltage against ground
Implementation Method 2
in the charging cycles the charging current attributable to the respective high charging voltage is measured
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a method for the electrostatic charging of non-conducting objects (1), wherein the objects (1) are charged individually in successive charging cycles (2), wherein, in a charging cycle (2), the respective object (1) is charged by means of at least one electrode (6), to which in the manner of an ionizer there is applied for this purpose by means of a supplying device (7) a high charging voltage Ucharge against ground or against at least one counter electrode, wherein the charging cycles (2) can be parameterized by means of the supplying device (7). It is proposed that in the charging cycles (2) the charging current Icharge attributable to the respective high charging voltage Ucharge is measured and in that the charging cycles (2) are parameterized in dependence on the measured charging current Icharge or the measured charging currents Icharge.