Modular Distribution Channeling for Paper Machine Headbox Thermal Management
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Solution Overview
Problem
Existing distribution channeling solutions for paper machines are prone to thermal expansion issues due to material mismatches, are expensive due to complex metal structures, and often require many separate pipes, leading to fabrication challenges and high costs.
Innovation Solution
The distribution channeling is designed as modular pieces with intermediate spaces for diluting fluid input, allowing for easy assembly, replacement, and use of cost-effective materials like plastic, which simplifies thermal management and reduces fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a distribution channeling is formed as a one-piece plate structure made of metal (e.g., acid-resistant steel), then it provides durability and resistance to chemical corrosion, but it becomes expensive to fabricate and difficult to manage thermal expansion when stock temperature varies
Solution Approach 1:
The distribution channeling is divided into multiple separate distribution pipes instead of being formed as a single plate structure. Each pipe can be independently manufactured, installed, and maintained, reducing fabrication complexity and cost while maintaining durability through selective material usage only where corrosion resistance is needed
Solution Approach 2:
The invention allows for material parameter changes by enabling the use of different materials for different components. Plastic or other cost-effective materials can be used for distribution pipes where chemical corrosion resistance is less critical, while metal can be used selectively for components requiring corrosion resistance, thereby reducing overall fabrication cost and complexity
2Adaptability or versatility
If multiple separate distribution pipes are used to form the distribution channeling, then thermal expansion management becomes easier and material selection is more flexible, but the number of components increases leading to higher fabrication cost and complexity
Solution Approach 1:
The distribution pipes are designed to serve multiple functions: they distribute stock suspension, allow for diluting fluid input through intermediate spaces, and provide flexible thermal expansion management. This multi-functionality reduces the need for additional specialized components, thereby reducing overall device complexity despite using multiple pipes
3Adaptability or versatility
If diluting fluid is to be introduced into the distribution channeling, then stock suspension can be diluted to desired levels, but the structure becomes more complex requiring additional ducts and integration points
Solution Approach 1:
Intermediate spaces are created between the modular distribution pipes, serving as intermediary zones where diluting fluid can be introduced. These intermediate spaces act as mediators that allow diluting fluid input without requiring complex internal modifications to the distribution pipes themselves, thereby adding dilution capability while minimizing structural complexity
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
Distribution channeling (4) for stock suspension, said distribution channeling being in connection with a headbox (1) of a paper machine, which distribution channeling is fed with a transverse input channel (9) for stock suspension, such as with an inlet pipe, and which distribution channeling (4) feeds stock suspension into an intermediate chamber (5) and onwards from the intermediate chamber to the slice channel (5´) of a paper machine, and the distribution channeling (4) is distribution channeling formed from a number of modular pieces (2) and is fitted to the headbox after the input channel, and that one or more distribution channels (3), such as a hole, for the stock suspension flowing through a modular piece are formed in the modular piece (2), and that the modular pieces are placed side by side such that an interspace (15) forms between them, from which interspace diluting water can be fed into the distribution channel (3).