Blown Film Cooling Gas Suction Ring
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Solution Overview
Problem
During the production of blown film, monomer-containing gases emitted from the thermoplastic material contaminate the cooling gas, leading to dirt deposits on plant elements, affecting product quality and posing health risks, especially in medical and food industries.
Innovation Solution
A device with a gas suction ring arranged downstream from the cooling gas supply, equipped with annular suction nozzles, is used to suck off contaminated cooling gas near its origin, and a diaphragm seals the film tube to enhance suction efficiency and protect subsequent components. The suctioned gas can be filtered and reused, with an additional cooling gas ring for continued film tube cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling gas is used to cool the film tube, then the film tube is cooled effectively, but the cooling gas becomes contaminated with monomer-containing gases causing dirt deposits on plant elements
Solution Approach 1:
The invention extracts the harmful contaminated cooling gas from the system by introducing a suction ring that removes the gas close to its source (the film tube). This prevents the contaminated gas from reaching and depositing on downstream plant elements like the calibrating basket and flattening device, while maintaining the necessary cooling function.
Solution Approach 2:
The suction ring acts as an intermediary device between the cooling gas supply and the plant elements. It intercepts the contaminated cooling gas before it can contaminate the plant elements, serving as a protective barrier that allows cooling to continue while preventing harmful deposits.
2Temperature
If cooling gas flows along the film tube, then cooling is maintained, but health risks arise from breathing in contaminated cooling gas
Solution Approach 1:
The suction ring extracts the contaminated cooling gas close to its source, removing it from the environment before operators can inhale it. This extraction system captures the monomer-containing gases that would otherwise be dispersed into the workspace air.
Solution Approach 2:
The invention converts the potentially harmful contaminated cooling gas into a manageable stream that can be captured and removed. By directing the contaminated gas into the suction ring, the system transforms a health hazard into a controlled flow that can be filtered or vented safely.
3Manufacturing precision
If plant elements are cleaned regularly to remove dirt deposits, then product quality is maintained, but production time is lost and access is complicated
Solution Approach 1:
The suction ring performs preliminary anti-action by preventing contamination before it occurs. By removing the contaminated cooling gas close to its source, the system prevents dirt deposits from forming on plant elements in the first place, eliminating the need for frequent cleaning and associated production interruptions.
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 significantly reduces contamination of plant components, protects equipment from dirt and health hazards, and maintains high production output by ensuring continuous, unobstructed cooling and handling of the film tube.
Implementation Method 1
a gas suction ring which encloses the film tube and comprises internal, substantially annularly arranged suction nozzles
Implementation Method 2
the film tube, after having left the annular nozzle of a blowing head, is substantially annularly blasted with cooling gas from the outside
Data Source
AI summary
An apparatus for the manufacture of a thermoplastic blown film is provided having a blower head for extruding a film tube of a thermoplastic material. An annular ring is provided for blowing a cooling gas on an outside surface of the film tube to solidify the film tube. This cooling gas is directed in a flow direction parallel to a wall of the film tube. The cooling gas is drawn off the tube by means of a suction ring positioned around the tube prior to flattening the tube to form a film tube.