Inert Gas Polymer Drying System
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Solution Overview
Problem
Conventional desiccant-based drying systems for granular resin materials face issues such as downtime due to desiccant regeneration and polymer degradation when exposed to heat and oxygen, leading to reduced throughput and compromised polymer properties.
Innovation Solution
The use of inert gases like nitrogen or argon to create an oxygen-free atmosphere for drying, allowing higher temperatures and reducing polymer degradation, thereby maintaining desirable properties like strength, ductility, and color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If desiccant-based drying systems are used to remove moisture from granular resin material, then the drying effectiveness is improved, but the system requires periodic regeneration downtime reducing throughput
Solution Approach 1:
The patent uses nitrogen or other inert gases to create an oxygen-free atmosphere in the drying hopper, replacing the conventional desiccant-based system. This inert atmosphere prevents polymer degradation while allowing continuous operation without desiccant regeneration downtime, thus resolving the contradiction between drying effectiveness and throughput.
2Speed
If high temperatures are used to dry polymer materials faster, then the drying speed is improved, but the polymer degrades when exposed to heat and oxygen
Solution Approach 1:
By introducing nitrogen or other inert gases into the drying hopper, the patent creates an oxygen-free environment that allows high-temperature drying without causing polymer oxidation or degradation. This enables faster drying speeds while protecting the polymer from thermal and oxidative damage.
Solution Approach 2:
The inert gas acts as an intermediary between the heat source and the polymer, allowing thermal energy to be applied for drying while the inert atmosphere prevents harmful oxygen-polymer interactions. This mediator enables the simultaneous achievement of fast drying and polymer protection.
3Productivity
If desiccant units are operated continuously without regeneration, then the throughput is maintained, but the desiccant loses effectiveness over time
Solution Approach 1:
The patent replaces the desiccant material with a nitrogen or inert gas atmosphere that does not require regeneration. This allows continuous operation maintaining both high throughput and reliable drying effectiveness, as the inert gas simply needs to be supplied continuously without periodic offline regeneration cycles.
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 faster drying with improved polymer properties, reducing downtime and maintaining structural stability, while avoiding the need for desiccant regeneration.
Implementation Method 1
a membrane having apertures therethrough of size allowing passage of gas molecules of oxygen size or smaller
Implementation Method 2
a heater for heating compressed air supplied to the heater through the first conduit
Implementation Method 3
introducing the stream of heated drying gas into a chamber for upward flow through the polymer material
Implementation Method 4
the stream of heated drying gas drying the polymer material by drawing moisture therefrom
Data Source
AI summary
Method and apparatus for drying granular resin material by heating compressed air to a temperature prescribed for gas separation membrane operation, presenting the heated compressed air to a membrane separating out oxygen-size and smaller molecules to provide a stream of gas molecules of at least nitrogen-size at a pressure substantially that of the compressed air, heating the stream of gas molecules of at least nitrogen-size to a temperature at which dew point of the stream is no higher than −40 degrees F., and introducing the heated stream of gas molecules into a chamber for upward flow to atmosphere through granular resin material in the chamber.