Textile Oven Layout With Preheating and Precooling Airflow
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Solution Overview
Problem
Traditional ovens for producing non-woven fabrics face issues with mechanical consistency, long heating times, energy consumption, and inefficient air flow management, leading to reduced productivity and increased space requirements due to bulky shut-off valves and difficult cleaning processes.
Innovation Solution
The oven design includes separate inlet and outlet heads with integrated pre-heating and pre-cooling devices, utilizing exhaust air for pre-heating fibres before they enter the main heating area and using air suction to enhance air flow and reduce energy losses, along with optional completely opening side walls and dampers for air flow inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ovens with internal shut-off valves are used to reverse air flow, then uniform melting of low melting point fibres is achieved, but the oven requires bulky transverse dimensions (1.5-2m) occupying 100% more space than needed for material passage
Solution Approach 1:
The oven is divided into multiple heating zones (first heating zone, second heating zone, third heating zone) with independent air supply and control. This segmentation allows each zone to operate independently, eliminating the need for bulky shut-off valves while maintaining precise control over air flow and heat distribution for uniform fibre melting.
Solution Approach 2:
A pre-heating zone is introduced before the main heating zones to preliminarily heat the air and material. This preliminary action allows the main heating zones to focus on uniform melting without requiring complex air flow reversal mechanisms, thereby reducing the oven's transverse dimensions.
2Strength
If traditional ovens with blind longitudinal sides and small inspection openings are used, then structural integrity is maintained, but cleaning operations become long and difficult requiring interruptions to productivity
Solution Approach 1:
The oven sides are made dynamically adjustable with movable and removable panels instead of fixed blind walls. This allows the structure to transition between a closed state for operation and an open state for cleaning, maintaining structural integrity during operation while enabling rapid access for cleaning to minimize productivity interruptions.
Solution Approach 2:
The oven design incorporates easy-access cleaning features where internal surfaces can be quickly reached and cleaned without major disassembly. The movable panels and simplified structure allow operators to perform cleaning operations efficiently, reducing the time and interruptions required compared to traditional ovens with complex internal structures.
3Temperature
If hot air flow is created by fans and burners placed on internal face of longitudinal walls, then heating of fibres is achieved, but a part of fibres exits from the veil and deposits on oven parts requiring cleaning
Solution Approach 1:
The heating sources (burners and fans) are extracted from the internal face of longitudinal walls and repositioned to blow hot air through dedicated nozzles directed at the material bed. This extraction prevents fibres from being blown onto oven walls and reduces deposition, while still achieving effective fibre heating through the material.
Solution Approach 2:
Hot air nozzles are introduced as intermediaries between the heating system and the material. These nozzles direct the hot air flow precisely through the material bed, preventing fibres from escaping onto oven surfaces while ensuring uniform heating. The nozzles act as a mediator that controls the interaction between hot air and fibres.
4Temperature
If the first heating of fibres takes place in the first module after entering the oven, then fibres are heated, but rather long heating times result with consequent energy consumption
Solution Approach 1:
A pre-heating zone is positioned at the entrance of the oven to preliminarily heat fibres before they enter the main heating zones. This preliminary action reduces the heating time required in subsequent zones and decreases overall energy consumption by preparing the material in advance rather than heating it from cold throughout the entire oven length.
Solution Approach 2:
The heating process is made dynamic with multiple heating zones operating at different intensities and temperatures. The first heating zone provides intensive preliminary heating, followed by subsequent zones that complete the heating process more efficiently. This dynamic approach optimizes heating time and energy consumption compared to uniform heating throughout a single zone.
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 design reduces heating times, increases productivity, and enhances energy efficiency by recovering heat from exhaust air, while also minimizing the oven's size and improving cleaning accessibility, thus addressing the limitations of existing ovens.
Implementation Method 1
a pre-heating device (19), arranged in said inlet head (13), which sends hot air taken from the oven to the bed of fibres thus pre-heating the same
Implementation Method 2
said outlet head (14) also comprising pre-cooling means (23)
Implementation Method 3
The pre-heating device (19) may also be any type of heater with air flow, where the air can be heated by an electrical resistance, a gas or liquid fuel burner
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An oven (10) for the textile sector is disclosed, comprising an inlet head (13) and an outlet head (14). Said inlet head (13) is associated to a pre-heating device (19) and, advantageously, said outlet head (14) is associated to a pre-cooling device (23), comprising an air suction unit (24).