Segmented Shoe Press Mechanism for Paper Dewatering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shoe press apparatuses struggle to efficiently apply the required pressure for both bulky and high-density papers, such as coated base paper, leading to inadequate consolidation and potential 'blistering' issues during the paper production process.
Innovation Solution
The shoe press apparatus is designed with a pair of press mechanisms along the paper's traveling direction, allowing individual adjustment of pressing forces to apply necessary pressure efficiently, using a combination of hydrodynamic and hydrostatic pressure principles to effectively dewater and consolidate papers of varying densities without the need for additional rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single press mechanism is used in conventional shoe press apparatus, then the apparatus structure remains simple, but it cannot efficiently apply the required pressure for both bulky and high-density papers
Solution Approach 1:
The press mechanism is divided into a first press mechanism and a second press mechanism positioned at different locations along the paper traveling direction. Each press mechanism can be independently controlled to apply pressure to different sections of the paper web, enabling adaptation to both bulky and high-density paper types without requiring a completely different press configuration.
Solution Approach 2:
Different press mechanisms are positioned to apply pressure to specific local regions of the paper web. The first press mechanism handles one type of paper while the second press mechanism handles another type, allowing each mechanism to be optimized for its specific function and paper type.
2Adaptability or versatility
If additional rolls are added to handle high-density papers, then the pressure application capability improves, but the apparatus scale increases
Solution Approach 1:
The existing shoe press apparatus structure is made multi-functional by adding a second press mechanism that can handle both bulky and high-density papers. The apparatus maintains its original shoe press configuration while gaining the additional capability to process high-density papers like coated base paper, avoiding the need for separate dedicated presses for different paper types.
3Manufacturing precision
If pressure is applied to high-density paper, then consolidation improves, but rewetting water increases causing blistering
Solution Approach 1:
The first press mechanism applies pressure to the paper web before it reaches the second press mechanism. This preliminary pressing action begins the consolidation process and removes some moisture, so that when the second press mechanism applies additional pressure for high-density paper consolidation, the amount of rewetting water is reduced, minimizing the risk of blistering.
Solution Approach 2:
The two press mechanisms operate in sequence along the paper traveling direction, providing continuous pressing action. This continuous pressure application ensures consistent consolidation throughout the paper web while controlling moisture removal and rewetting effects, preventing blister formation.
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 configuration enables efficient pressure application for both low-density bulky paper and high-density coated base paper, reducing rewetting water and preventing 'blistering', while maintaining a simple apparatus design and preventing scale increase.
Implementation Method 1
using a combination of hydrodynamic and hydrostatic pressure principles to effectively dewater and consolidate papers
Implementation Method 2
using a combination of hydrodynamic and hydrostatic pressure principles to effectively dewater and consolidate papers
Implementation Method 3
a lubricating oil injection nozzle 21 provided fixedly on the upstream side in the direction of rotation of the blanket 6 with respect to the press mechanism 100 inside the blanket 6 for injecting lubricating oil toward the inner circumferential face of the blanket 6
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A shoe press apparatus of a paper machine for pressing wet paper (1) through a nip includes a counter roll (4), and a shoe module (5) disposed adjacent to the counter roll (4). The shoe module (5) includes a cylindrical blanket (6), and a press mechanism (7; 7'; 7") disposed inside the cylindrical blanket (6), extending in a width direction of the cylindrical blanket (6) and individually pressing a plurality of pressed portions formed on the cylindrical blanket (6) along a traveling direction of the wet paper (1), toward an outer-surface of the counter roll (4) so that the wet paper (1) is pressed in the nip between the cylindrical blanket (6) and the counter roll (4) so that a pressure can be applied efficiently in response to a density required for paper solely by the shoe press apparatus.