Heated Fluid Delivery Zones for Uniform Web Temperature
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Solution Overview
Problem
Existing apparatuses for delivering heated fluids to substrates, such as moving web-like substrates, face challenges in achieving uniform temperature distribution and efficient fluid handling, particularly in expanding zones where significant lateral and tertiary expansions occur, leading to temperature variations and flow non-uniformities.
Innovation Solution
The apparatus comprises a preheat zone, an expansion zone with significant lateral and tertiary contractions, and an expanded zone equipped with trim heaters and fluid flow-distribution sheets to fine-tune the temperature and flow velocity, ensuring a uniform delivery of heated fluid through a moving substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the apparatus uses a simple heating zone without expansion control, then the device complexity is reduced, but the temperature uniformity across the substrate deteriorates due to significant lateral and tertiary expansions occurring in the heating zone
Solution Approach 1:
The heating apparatus is divided into distinct functional zones: a preheat zone for initial heating, an expansion zone for controlled lateral and tertiary expansion, and a trim heater zone for fine temperature adjustment. This segmentation allows each zone to perform its specific function optimally, preventing temperature non-uniformities that would occur in a single undivided heating zone.
Solution Approach 2:
The expansion zone acts as an intermediary between the preheat zone and the substrate processing area. It mediates the transition by controlling the expansion of heated air and fluid flow characteristics, ensuring that temperature uniformity is maintained while allowing necessary expansion to occur.
2Area of stationary object
If the apparatus expands the fluid flow significantly in the heating zone, then the fluid distribution coverage is improved, but the flow non-uniformities and temperature variations increase
Solution Approach 1:
The fluid flow path is segmented into distinct zones with different expansion characteristics. The preheat zone handles initial heating with controlled expansion, while the expansion zone manages further lateral and tertiary expansion separately. This segmentation allows progressive expansion without creating flow non-uniformities that would result from single-stage expansion.
Solution Approach 2:
The preheat zone performs preliminary heating and flow conditioning before the fluid enters the expansion zone. This preliminary action ensures that the fluid is properly prepared for subsequent expansion, maintaining flow uniformity and temperature consistency even as the coverage area increases.
3Manufacturing precision
If the apparatus uses multiple heating zones with trim heaters, then the temperature control precision is improved, but the device complexity increases
Solution Approach 1:
Trim heaters are applied locally in specific zones where fine temperature adjustment is needed, rather than uniformly across the entire heating apparatus. This local application of trim heaters provides precise temperature control at critical locations while minimizing the overall complexity increase compared to a fully distributed heating system.
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 allows for precise temperature control and uniform fluid distribution across the substrate, enhancing processes like through-air bonding of fibrous mats by maintaining a narrow temperature window, even for monocomponent fibers, and accommodating wide substrates with minimal temperature variation.
Implementation Method 1
The apparatus comprises a preheat zone, an expansion zone
Implementation Method 2
an expanded zone equipped with trim heaters and fluid flow-distribution sheets to fine-tune the temperature
Data Source
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AI summary
Herein are disclosed apparatus and methods for delivering a heated fluid. The apparatus comprises at least a preheat zone, an expansion zone, and an expanded zone comprising a plurality of trim heaters, at least one fluid flow-distribution sheet, and an outlet.