Layered Press Felt Structure for Water Removal and Web Marking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional press felts have low surface area, leading to insufficient moisture evaporation and lack of marking effect, resulting in uneven web surfaces in fiber web machines.
Innovation Solution
A press felt design featuring a first fiber layer on the web-side, a second fiber layer on the machine-side, and at least one woven base fabric and one spiral fabric between the layers, with spiral loop yarns and pintle wires, enhancing surface area and mechanical marking effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional press felts with low surface area are used, then smooth web surface is achieved, but water removal properties are insufficient
Solution Approach 1:
The press felt is divided into multiple functional layers (base fabric layer, first fiber layer, second fiber layer, spiral fabric layer) with distinct roles. The spiral fabric layer specifically provides high surface area for water removal, while the base fabric layer maintains web smoothness, resolving the contradiction between smoothness and water removal efficiency
Solution Approach 2:
The press felt combines different material types (woven base fabric, carded fiber layers, spiral fabric) into a composite structure. Each material contributes different properties: the base fabric provides smoothness, while the spiral fabric provides high surface area for evaporation, achieving both smooth web surface and improved water removal
2Device complexity
If conventional press felts with low surface area are used, then structural simplicity is maintained, but marking effect is insufficient
Solution Approach 1:
The spiral fabric layer introduces curved, spiral-shaped structures into the press felt design. This curvature creates a marking effect on the web surface while maintaining reasonable structural complexity through the use of pre-formed spiral fabric components
Solution Approach 2:
Different regions of the press felt have different properties: the base fabric layer provides smoothness for areas requiring web quality, while the spiral fabric layer provides marking effect for areas requiring water removal. This local differentiation allows the press felt to perform multiple functions simultaneously
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
The design provides improved moisture evaporation and energy-efficient drying by increasing the surface area and imparting a smooth or granular texture to the fiber web, depending on the spiral fabric's placement, while ensuring robustness and ease of installation.
Implementation Method 1
increased surface area for better evaporation of moisture from a pulp
Implementation Method 2
The press felt conveys the web through the press section and receives water removed from the web during pressing
Data Source
AI summary
A press felt (100) has a seam and a web-side and a machine-side. The press felt (100) has a first fiber layer (131) on the web-side, a second fiber layer (132) on the machine-side, and at least one woven base fabric (110) and at least one spiral fabric (120) between the fiber layers (131, 132).