Extrusion Press Mandrel Steam Control
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Solution Overview
Problem
Existing extrusion technologies face issues with non-reproducible process conditions and quality problems due to uncontrolled internal vapor deposition, leading to mechanical stress and inefficiencies in steam utilization.
Innovation Solution
Implementing steam quantity control with internal steaming from the mandrel jacket, optimizing steam condensation in the strand's highest density areas, and utilizing saturated steam for targeted heat distribution, which allows for precise control and efficient use of steam, reducing excess steam and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal vapor deposition is used to steam the strand from inside, then the strand can be steamed effectively, but the process conditions become uncontrolled and non-reproducible leading to quality problems
Solution Approach 1:
The patent applies local quality by providing steam outlet openings specifically in the outlet area of the recipient and/or entrance area of the heating channel, where the strand has highest density. This localized steaming ensures controlled vapor deposition precisely where needed, achieving both effective strand steaming and reproducible process conditions.
2Reliability
If excess steam is used to ensure complete penetration, then the strand can be fully steamed, but construction and operating costs increase significantly
Solution Approach 1:
The patent changes the steam parameters by using saturated steam at specific pressures (10-15 bar) and temperatures, and controls the steam quantity precisely. This optimized steam parameter control ensures complete penetration with minimal excess steam, reducing energy consumption while maintaining reliable steaming.
Solution Approach 2:
The patent implements steam quantity control with feedback mechanisms that monitor and adjust steam supply based on actual strand conditions. This ensures optimal steam utilization where needed while avoiding excess steam, thereby reducing construction and operating costs.
3Manufacturing precision
If the heating channel is made longer to ensure uniform heating, then the setting process can be completed, but the overall extrusion press length increases
Solution Approach 1:
The patent utilizes phase transitions of steam (condensation) as the primary heating mechanism. The phase change from vapor to liquid releases latent heat directly in the strand, providing intense and uniform heating. This eliminates the need for long heating channels, as the phase transition occurs rapidly within a compact space, achieving both uniform heating and compact press length.
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 ensures clear and reproducible process conditions, secure binder binding, and a significant reduction in construction and operating costs, while enhancing the setting process efficiency and accelerating the heating process, allowing for a shorter heating channel and overall extrusion press length, thereby increasing profitability.
Implementation Method 1
the strand is steamed with saturated steam in the area of highest strand compression, which condenses in the strand material and thereby penetrates the strand transversely and is heated to the setting temperature
Implementation Method 2
the phase change releasing the heat required for setting in an optimal manner and with a uniform distribution
Implementation Method 3
The steam generator (15) produces saturated steam from water or another suitable medium
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a method and an extrusion press for producing extruded products from small wood particles mixed with binders, which are pressed into a strand (2) in an extrusion press (1) and treated with heat and steam. Steam (14) is preferably supplied to the strand (2) from the inside of the adjacent shell (20) of a hollow press mandrel (19) in a controlled quantity, wherein the quantity and pressure of the steam are matched to the heat absorption capacity of the treated strand section and dimensioned such that they are sufficient for transverse penetration and curing of the strand (2) and can substantially compensate for the amount of steam in the strand (2). Figure 2 is the selected figure.