Blown Film Cooling Device with Simultaneous Gas Flow and Temperature Control
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Solution Overview
Problem
Current film production technologies face challenges in achieving minimal film thickness variation due to the complex and costly reversing draw-off devices required to prevent circular rings on film spools, which complicate operation and increase production costs.
Innovation Solution
A cooling device that simultaneously adjusts the flow volume and temperature of cooling gas to optimize film profile thickness, using bimetal adjuster elements and a drive device to move regulator elements, allowing for precise control of film thickness and prevention of circular rings without the need for reversing draw-off systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reversing draw-off devices are used to prevent circular rings on film spools, then film thickness uniformity is improved, but device complexity and cost increase significantly
Solution Approach 1:
The invention extracts the essential function of preventing circular rings from the complex reversing draw-off device and implements it through a simplified cooling device with adjustable cooling gas flow and temperature, eliminating the need for expensive support towers, reversing gearboxes, and deflection rolls
Solution Approach 2:
The invention changes the parameters of the cooling process by simultaneously adjusting cooling gas flow volume and temperature to control film thickness profile, replacing the mechanical reversing action with thermal parameter control that achieves the same film uniformity result
2Manufacturing precision
If reversing draw-off devices are installed at great height to cool film, then film thickness regulation is improved, but installation cost and facility height requirements increase
Solution Approach 1:
The invention removes the heavy support tower structure entirely by implementing a cooling device that can be positioned closer to the extrusion point, extracting the height requirement from the system while maintaining film thickness control capability through optimized cooling gas application
3Manufacturing precision
If complex reversing mechanisms are used to prevent circular rings, then film spool quality is improved, but operation reliability decreases due to more failure points
Solution Approach 1:
The invention extracts the circular ring prevention function from the complex reversing mechanism and implements it through a reliable cooling device with adjustable gas flow and temperature, eliminating multiple potential failure points in gears, bars, and deflection rolls
Solution Approach 2:
The cooling device with bimetal adjuster elements automatically regulates cooling gas flow and temperature to maintain film thickness uniformity and prevent circular rings without requiring complex mechanical reversing operations or manual intervention
4Productivity
If cooling gas flow volume and temperature are simultaneously adjustable, then film thickness adjustment speed is improved, but control system complexity increases
Solution Approach 1:
The invention merges the control of cooling gas flow volume and temperature into a single integrated cooling device with coordinated adjustment mechanisms, allowing simultaneous modification of both parameters through a unified control system that manages the relationship between flow and temperature
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 solution enables precise adjustment of film thickness, significantly reducing the formation of circular rings and potentially eliminating the need for costly reversing draw-off devices, while improving operational simplicity and reducing production costs.
Implementation Method 1
a cooling device (5) for cooling the film (20) exiting from the blower head (4), wherein a flow volume of cooling gas (12) can flow out of the cooling device (5) at a cooling gas temperature
Implementation Method 2
a heating element (32) integrated inside the cooling device (5), wherein the valve element (31) and the heating element (32) can be coupled to one another
Implementation Method 3
the valve element (31) can be a deformable bimetal adjuster element (31a), by means of which it is possible to modify the flow volume of cooling gas (12) upon modification of the cooling gas temperature, by means of narrowing or enlarging a cross-section of the cooling gas channel (33)
Data Source
AI summary
The invention relates to a device for cooling a film (20), in particular a film tube (20), wherein the film (20) can be produced from a blower head (4) of a film extrusion apparatus (50), in particular a blown film extruder (51); the invention has a cooling device (5), wherein a flow volume of cooling gas (12) can flow out of the cooling device at a cooling temperature in such a manner that the flow volume of cooling gas (12) can flow over the film (20). According to the invention, means are provided such that the flow volume of cooling gas (12) and the cooling gas temperature can be adjusted simultaneously.