Nozzle Slot Profile Control for Film Thickness Regulation
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Solution Overview
Problem
Existing methods for controlling the nozzle slot of a flat film machine's discharge nozzle fail to account for the actual starting situation of the nozzle slot's profile, leading to inefficient regulation and unpredictable thickness profile fluctuations, resulting in defects and quality issues in the film product.
Innovation Solution
A method that acquires the actual profile of the nozzle slot, detects the film track's thickness profile, compares it to a preset profile, determines deviations, and performs targeted controlling interventions based on both the profile deviation and the actual profile, ensuring a force equilibrium and complex geometric configuration are considered for precise adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thickness regulation is performed based only on detected thickness profile without considering actual starting situation of nozzle slot, then regulation can be implemented, but regulation efficiency is low and multiple regulation steps are required
Solution Approach 1:
The actual profile of the nozzle slot is acquired and stored before thickness regulation begins. This preliminary action provides the starting situation information needed to optimize subsequent regulation steps, allowing the control system to predict the effect of thermal adjustments and reduce the number of regulation iterations required.
Solution Approach 2:
The control system uses both the detected thickness profile and the stored actual nozzle slot profile as feedback inputs. By comparing the detected thickness profile with the preset profile and considering the actual starting geometry of the nozzle slot, the system can calculate more accurate control signals for the thermal bolts, improving regulation efficiency and reducing adjustment steps.
2Ease of operation
If thickness regulation is performed without considering actual profile of nozzle slot, then control intervention can be applied, but transverse influences have undesirable and unpredictable effects at other points
Solution Approach 1:
The actual profile of the nozzle slot is acquired and stored before thickness regulation begins. This preliminary action provides the starting situation information needed to optimize subsequent regulation steps, allowing the control system to predict the effect of thermal adjustments and reduce the number of regulation iterations required.
Solution Approach 2:
The control system considers the local geometry of the nozzle slot at each adjustment point by utilizing the stored actual profile. This allows for localized control interventions that account for the specific starting conditions at each transverse position, preventing unpredictable effects at other points while maintaining control simplicity.
3Manufacturing precision
If actual profile of nozzle slot is acquired and used for controlling intervention, then regulation precision is improved, but measurement and detection complexity increases
Solution Approach 1:
Instead of directly measuring the complex three-dimensional geometry of the nozzle slot, the system creates a simplified digital representation or copy of the actual profile. This copying approach captures the essential geometric information needed for control precision while avoiding the complexity of full 3D measurement and processing.
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 more effective and stable control of the film track's thickness profile, reducing the need for multiple regulation steps and minimizing defects, ensuring the film quality is maintained within narrower limits with greater certainty and precision.
Implementation Method 1
these adjusting means are, for example, so-called thermal bolts which, depending on the desired controlling intervention, can be acted upon by the regulation method with a temperature, a heating power, a heating time, a heating interval and/or a heating voltage, so that direct intervention on the geometric design of the nozzle slot of the discharge nozzle is possible by thermal expansion or by thermal contraction
Implementation Method 2
these adjusting means are, for example, so-called thermal bolts which, depending on the desired controlling intervention, can be acted upon by the regulation method with a temperature, a heating power, a heating time, a heating interval and/or a heating voltage, so that direct intervention on the geometric design of the nozzle slot of the discharge nozzle is possible by thermal expansion or by thermal contraction
Data Source
AI summary
The invention relates to a method for controlling a nozzle slot (112) of a discharge nozzle (110) for a film track (FB) of a flat film machine (100), comprising the following steps:acquiring an actual profile (IP) of the nozzle slot (112),detecting a thickness profile (DP) of the film track (FB),comparing the detected thickness profile (DP) of the film track (FB) with a preset profile (VP),determining a profile deviation (PA) as a result of the comparison,performing a controlling intervention to change the nozzle slot (112) based on the profile deviation (PA) and the actual profile (IP).