Height-Adjustable Cooling Ring for Blown Film Throughput
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Solution Overview
Problem
Blown film systems face challenges in maximizing throughput while maintaining reliable production and film quality, as existing cooling methods may not efficiently manage the expansion and stabilization of the film tube.
Innovation Solution
A blown film system with a monotonically expanding inner cooling body and a height-adjustable cooling ring, where the cooling ring is initially positioned below the air outlet section during startup and moved upwards for steady-state production, utilizing a controller to adjust its height and optimize cooling airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cooling rings are used to increase throughput, then productivity increases, but the system complexity and difficulty of controlling film tube stability increase
Solution Approach 1:
The patent makes the cooling ring height adjustable during operation, allowing dynamic repositioning from a lower position during startup to an upper position during steady-state production. This dynamic adjustment optimizes cooling efficiency at different production stages without requiring multiple fixed cooling rings, thereby increasing throughput while controlling system complexity
Solution Approach 2:
The invention changes the operational parameters of a single cooling ring by adjusting its vertical position along the film tube. By varying the height parameter, the system achieves different cooling effects suitable for different production phases, replacing the need for multiple cooling rings with varying configurations
2Reliability
If the cooling ring is positioned higher during startup, then film tube stabilization is improved, but cooling efficiency during steady-state production decreases
Solution Approach 1:
The cooling ring's vertical position is dynamically adjusted based on production phase: positioned lower during startup for optimal film tube stabilization and cooling, then moved higher during steady-state production to maintain stabilization while adapting to changed thermal conditions. This dynamic repositioning resolves the contradiction between stabilization and cooling efficiency
Solution Approach 2:
The system performs preliminary positioning of the cooling ring at an optimized lower height during startup to ensure proper film tube formation and stabilization before production begins. Once the film tube is established, the ring is repositioned to a higher location for steady-state operation, ensuring optimal conditions are established in advance
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 configuration significantly increases throughput without compromising production quality by ensuring consistent film tube expansion and stabilization through controlled cooling, as demonstrated by prototype tests.
Implementation Method 1
an internal heat sink (5) for internal cooling of the blown film tube (40)
Implementation Method 2
an air cooling ring (6) for external cooling of the blown film tube (40)
Implementation Method 3
This film tube is pressurized. Due to its still-molten state, this pressure causes the film tube to expand radially
Data Source
AI summary
The invention relates to a blown film line and to a method for operating a blown film line. The problem addressed by the invention is that of further increasing the throughput of known blown film lines without negatively influencing production quality. According to the invention, the interior cooling element (5) has an air outlet section (12), wherein additionally a cooling ring (6) is designed to be height-adjustable, wherein a controller positions the cooling ring (6) in the lower region of the interior cooling element (5) to start up the line, and positions the cooling ring in the upper region of the air outlet section (12) of the interior cooling element (5) to achieve the steady-state production.