PAS Foam Tubular Assembly for Lightweight Steam Hose Insulation
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Solution Overview
Problem
Current steam hose manufacturing processes are inefficient and hazardous due to the use of fiberglass insulation, requiring multiple operators, complex batch processes, and posing safety risks, while also being heavy and prone to thermal degradation.
Innovation Solution
A polyarylene sulfide (PAS) foam layer is used to insulate steam hoses, offering reduced density, thermal conductivity, and thermal effusivity, allowing for a single continuous processing step, improved safety, and increased productivity, eliminating the need for fiberglass and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiberglass insulation is used in steam hoses, then thermal insulation performance is achieved, but manufacturing complexity increases and safety risks arise
Solution Approach 1:
The patent removes fiberglass from the steam hose construction entirely and replaces it with a polymer foam insulation layer. This extraction eliminates the need for complex multi-step manufacturing processes involving fiberglass handling, tape wrapping, and protective measures, while maintaining thermal insulation performance through the foam material's inherent properties.
Solution Approach 2:
The invention changes the material parameter from fibrous insulation (fiberglass) to cellular foam insulation (polymer foam). This parameter change fundamentally alters the manufacturing process from a complex batch process requiring multiple operators to a simpler continuous extrusion process, while maintaining or improving thermal insulation performance.
2Reliability
If fiberglass tape is used for insulation, then thermal protection is provided, but worker safety is compromised due to glass fiber exposure
Solution Approach 1:
The patent extracts and removes the harmful fiberglass component from the steam hose construction, replacing it with a safe polymer foam material. This eliminates glass fiber exposure risks to workers during manufacturing, installation, and maintenance while maintaining the necessary thermal protection through the foam insulation's thermal resistance properties.
Solution Approach 2:
The invention converts the harmful fibrous structure into a beneficial cellular foam structure. The closed-cell foam architecture provides thermal insulation equivalent to or better than fiberglass while eliminating the harmful effects of loose glass fibers, creating a safer material that protects both workers and maintains thermal performance.
3Ease of manufacture
If a two-step batch process is used for manufacturing steam hoses, then fiberglass insulation and polymer jacket can be applied, but productivity decreases and manufacturing time increases
Solution Approach 1:
The patent merges the insulation layer and outer jacket into a single integrated polymer foam structure that is extruded in one continuous operation. This combines what were previously two separate batch processes (fiberglass wrapping and polyimide tape application) into a single continuous extrusion process, dramatically increasing productivity and eliminating the need for process interruptions.
Solution Approach 2:
The invention implements a continuous extrusion process where the polymer foam is continuously formed and applied to the steam hose throughout its length. This eliminates the discontinuous batch process requirements of fiberglass handling and tape wrapping, allowing uninterrupted manufacturing and significantly increasing production throughput.
4Reliability
If fiberglass insulation is used, then thermal insulation is achieved, but the hose becomes heavy and difficult to handle
Solution Approach 1:
The patent changes the density parameter of the insulation material by transitioning from dense fibrous structures (fiberglass and polyimide tape) to a low-density cellular foam structure. This parameter change reduces the overall weight of the steam hose while maintaining thermal insulation performance through the foam's trapped air pockets that provide thermal resistance.
Solution Approach 2:
The invention uses a porous cellular foam structure as the insulation layer. The closed-cell or open-cell foam architecture provides thermal insulation through trapped gas pockets while maintaining low density and lightweight properties, making the steam hose easier to handle and install compared to dense fibrous insulation materials.
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
The PAS foam layer provides effective thermal performance, enhanced safety, and reduced installation and maintenance costs, enabling lighter, more flexible, and robust steam hoses that can withstand high temperatures without the need for additional protective measures.
Implementation Method 1
a polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and/or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material
Implementation Method 2
a polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and/or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material and/or 50% or greater thermal effusivity reduction relative to the thermal effusivity of an un-foamed PAS polymer material
Data Source
AI summary
A polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and/or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material and/or 50% or greater thermal effusivity reduction relative to the thermal effusivity of an un-foamed PAS polymer material. The PAS foam layer may have a low density (e.g., less than 0.67 g/cc) and/or a low thermal conductivity (e.g., anywhere from 0.017 W/(m-K) to 0.145 W/(m-K)) and/or a low thermal effusivity (e.g., less than 316 Ws1/2/m2/K, optionally anywhere from 38 Ws1/2/m2/K to 316 Ws1/2/m2/K) even at high temperatures (e.g., above 400 degrees Fahrenheit (° F.) (about 204 degrees Celsius (° C.)). Such a PAS foam layer may have characteristics appropriate for use as part of a steam hose.