Heat Bolt Lip Gap Control for Uniform Resin Film Thickness
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Solution Overview
Problem
Resin-film manufacturing apparatuses face challenges in achieving uniform film thickness due to variations in heat bolt thermal expansion and require time-consuming parameter adjustments for PID control, leading to inefficiencies in resin film production.
Innovation Solution
Implementing a control unit that performs reinforcement learning to adjust heat bolt settings based on real-time thickness measurements, using a combination of state observation, control condition learning, and optimal action selection to maintain uniform film thickness without the need for parameter adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat bolts are used to adjust lip gap for uniform film thickness, then manufacturing precision is improved, but device complexity increases due to multiple heat bolts and control systems
Solution Approach 1:
The patent changes the control parameter from manual lip gap adjustment to automated heat bolt temperature control. By controlling the temperature parameters of heat bolts through a control unit, the system achieves precise lip gap adjustment and uniform film thickness without complex manual intervention, resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent implements a feedback control mechanism where the control unit receives information about film thickness or lip gap status and automatically adjusts heat bolt temperatures accordingly. This closed-loop feedback system simplifies operation while maintaining high manufacturing precision, addressing the technical contradiction effectively
2Manufacturing precision
If PID control is used for heat bolt adjustment, then manufacturing precision is improved, but loss of time increases due to parameter adjustment requirements
Solution Approach 1:
The control unit performs self-adjustment of heat bolt parameters based on feedback signals without requiring external parameter tuning. The system automatically maintains optimal control parameters through its own operation, eliminating the time-consuming manual parameter adjustment process while preserving manufacturing precision
Solution Approach 2:
The control unit is pre-programmed with optimal control strategies and parameters for different operating conditions. When started, it immediately applies appropriate control actions without requiring real-time parameter adjustment, reducing startup and adaptation time while maintaining precision
3Manufacturing precision
If multiple heat bolts are arranged along the longitudinal direction of lips, then manufacturing precision is improved for width-direction uniformity, but device complexity increases
Solution Approach 1:
The patent divides the lip gap control function into multiple independent heat bolts arranged along the longitudinal direction. Each heat bolt independently controls the lip gap at its specific position, enabling precise width-direction uniformity. The segmentation approach manages complexity by creating modular, independently controllable units
4Manufacturing precision
If feedback control is implemented for lip gap distance, then manufacturing precision is improved, but device complexity and loss of time increase due to measurement and control systems
Solution Approach 1:
The patent implements feedback control by measuring lip gap distance or film thickness and using this information to automatically adjust heat bolt temperatures. The control unit processes feedback signals and makes real-time adjustments, improving manufacturing precision while managing system complexity through integrated control logic
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 enables efficient and precise control of heat bolt settings, reducing the time and resin material required for adjustments, resulting in high-quality resin films with uniform thickness.
Implementation Method 1
a plurality of heat bolts arranged along the longitudinal direction of lips (i.e., in the width direction of a resin film) are provided. It is possible to locally adjust the distance between lips (i.e., the lip gap) of the die by individually controlling the amount of the thermal expansion of each heat bolt by using a heater.
Data Source
AI summary
In a resin-film manufacturing apparatus of an embodiment, when a lip gap control is started, a difference between a state of a target heat bolt (THB) at a start of current control and a state of each of all the heat bolts at a start of last control is obtained, when the difference between the states of THB at the starts of the current and last control is a smallest one, a learning result of THB is set as an initial value of a control condition for THB, and when the difference between the states of THB is not the smallest one, either one of a learning result of the heat bolt of which the difference between the states is smaller than the difference between the states of THB and the learning result of THB is set as the initial value of the control condition for THB.