Insulated Paper Machine Hood Elements with Watertight Tongue-and-Groove Joints
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Solution Overview
Problem
Existing insulated hoods for paper or paper board machines are time-consuming and laborious to build, prone to water and humid air penetration, which weakens insulation and requires costly protective measures, leading to high manufacturing and installation costs.
Innovation Solution
A watertight and water vapour-tight hood construction using prefabricated elements with a tongue-and-groove joint and corrosion-resistant materials, eliminating the need for external protection and allowing for easy installation and modification without additional engineering work.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulation material and cover plates are arranged to a frame structure, then the hood provides insulation function, but the construction is time-consuming and laborious
Solution Approach 1:
The hood is divided into modular elements (wall elements, roof elements, door elements) that can be pre-fabricated and then assembled on-site. Each element contains integrated insulation material and cover plates, allowing for quick installation while maintaining insulation performance.
Solution Approach 2:
The insulation material and cover plates are pre-assembled into complete elements before delivery to the construction site. This preliminary preparation eliminates the need for time-consuming on-site assembly of separate components, significantly reducing construction time while ensuring proper insulation installation.
2Reliability
If cold insulated surfaces are used in humid conditions, then insulation efficiency is maintained, but water condensates on the surfaces causing weakening of insulation material
Solution Approach 1:
A water vapour barrier film is applied to the cold insulated surfaces to prevent water vapor from condensing on the insulation material. This thin film barrier maintains the insulation efficiency by allowing thermal insulation while protecting the insulation material from moisture-induced weakening.
Solution Approach 2:
The water vapour barrier film acts as an intermediary layer between the cold insulated surface and the humid environment. It prevents direct contact between moisture and the insulation material, thereby maintaining both insulation efficiency and material strength in humid conditions.
3Reliability
If separate stainless steel save-alls or air heated hollow stainless steel panels are used to protect against water splashes, then the hood is protected, but manufacturing and installation costs increase and external equipment is needed
Solution Approach 1:
The water vapour barrier film is integrated directly into the hood elements themselves, combining the protective function with the structural components. This eliminates the need for separate stainless steel save-alls or air heated panels, reducing both manufacturing complexity and the need for external equipment while maintaining protection against water splashes and vapor penetration.
Data Source
AI summary
An insulated hood of a paper machine, in which hood at least a wall, a door element or a roof has been constructed by arranging at least a first element (10) and a second element (11) in contact with each other. The elements comprise two essentially parallel planar surfaces (12a, 12b), an insulation material (13) between the surfaces, and watertight edges. The gap between the first and the second surface (12a, 12b) comprising the insulation material (13) is free of frame structures of the hood.