Rubber Extrusion Shutter Prevents Strip Rolling
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Solution Overview
Problem
Existing rubber extrusion devices face the issue of rubber front rolling up during device restart due to surface tension differences between the faces of the extruded strip, which is difficult to control with parameters like adhesion and rubber composition.
Innovation Solution
A device with a forming passage defined by a rotary roller and shutter means that can be deactivated when the rubber pressure exceeds a predetermined threshold, preventing rolling up by ensuring sufficient traction and rotation of the roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device restarts after stopping extrusion, then the rubber front is not subjected to sufficient traction downstream from the forming passage, but this causes surface tension difference between the first and second faces of the extruded strip to be non-zero, leading to rolling up of the strip
Solution Approach 1:
The shutter member is positioned in advance to block the forming passage before extrusion begins. During restart, the shutter remains closed until the rubber pressure reaches the predetermined threshold, ensuring that extrusion only starts when sufficient traction is guaranteed. This preliminary positioning prevents rolling up without requiring complex real-time control systems.
Solution Approach 2:
The device uses pressure sensing means to continuously monitor the rubber pressure upstream from the shutter. When the pressure reaches the predetermined threshold, this feedback signal triggers the automatic opening of the shutter and activation of roller rotation. This closed-loop feedback system ensures reliable prevention of rolling up while maintaining relatively simple device architecture.
2Reliability
If parameters such as adhesion of rubber on the roller and composition of the rubber are modified to limit the rolling-up effect, then the rolling up is reduced, but these parameters are relatively difficult to control
Solution Approach 1:
The shutter member acts as an intermediary control element between the rubber pressure and the extrusion process. Instead of modifying difficult-to-control rubber parameters like adhesion and composition, the shutter provides a mechanical gate that responds to pressure changes. This intermediary mechanism achieves reliable rolling-up prevention through simple pressure threshold detection rather than complex material parameter control.
3Reliability
If the shutter means are kept closed to prevent rolling up during restart, then rolling up is prevented, but extrusion cannot begin until the pressure threshold is reached
Solution Approach 1:
The shutter member transitions dynamically from a static closed position to an open position based on real-time pressure conditions. During restart, it remains closed to prevent rolling up. Once the rubber pressure reaches the predetermined threshold, the shutter automatically opens and roller rotation activates, enabling immediate extrusion. This dynamic response optimizes both reliability and productivity by minimizing unnecessary startup delays.
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
Prevents rubber front rolling up during device restart by maintaining adequate pressure and activating roller rotation when the pressure threshold is met, ensuring consistent extrusion without rolling.
Implementation Method 1
the shutter means are deactivatable in the event of the rubber upstream from the shutter means exceeding a predetermined pressure threshold
Implementation Method 2
the shutter means comprise a shutter member that is urged by rated means that are rated as a function of the predetermined threshold pressure
Data Source
AI summary
A device for extruding a strip of rubber comprises a passage for forming the strip, which passage is defined by a rotary roller for forming and driving the strip. The device also comprises a shutter for shutting the forming passage, which shutter is deactivatable under the effect of the pressure of the rubber upstream from the shutter exceeding a predetermined threshold.