Spiral Sieve Void Geometry for Heat Transfer
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Solution Overview
Problem
Conventional non-thermoset sheet-like structures for spiral sieves have high air permeability and weight per unit area due to the narrow width-to-height ratio of spirals, leading to inefficient contact with paper webs and increased energy consumption in the paper-making industry.
Innovation Solution
The sheet-like structure is designed with spirals having a greater clear width than clear height in the void cross sections, reducing the number of pintle wires and air passage openings, and using flat or round plastic monofilaments to enhance contact area and reduce weight, allowing for improved contact with paper webs and increased heat transfer during the drying process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional narrow-width spirals are used, then the number of pintle wires and connection regions is reduced, but air permeability increases and contact area with paper webs decreases
Solution Approach 1:
The patent changes the geometric parameters of the spiral structure by inverting the width-to-height ratio of the void cross-section. Instead of narrow-width spirals (width < height), the invention uses wide-width spirals where the clear width extends greater than the clear height. This parameter change reduces the number of pintle wires needed while maintaining low air permeability and adequate contact area with paper webs.
2Quantity of substance
If conventional narrow-width spirals are used, then the structure uses less material, but weight per unit area increases and contact area with paper webs decreases
Solution Approach 1:
The invention changes the dimensional parameters of the spiral structure, specifically making the clear width greater than the clear height in the void cross-section. This parameter inversion allows for reduced material usage while simultaneously reducing weight per unit area and increasing contact area with paper webs, resolving the contradiction between material quantity and weight.
3Ease of manufacture
If conventional narrow-width spirals are used, then manufacturing is simpler, but drying speed decreases due to reduced heat transfer area
Solution Approach 1:
The patent applies parameter changes by inverting the width-to-height ratio of the spiral void cross-section. This geometric modification increases the contact area between the spiral sieve and paper webs, thereby enhancing heat transfer area and improving drying speed, while maintaining manufacturing simplicity through the continuous monofilament construction method.
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 design results in lower air permeability, reduced weight per unit area, enhanced paper quality, increased drying speed, and energy savings by minimizing marks on paper and optimizing heat transfer during the drying process.
Implementation Method 1
the sheet-like structure is subjected to a thermosetting process in which the sheet-like structure is stretched to a tension which is pre-specified by a calender and in which, on the basis of the temperature influence, said sheet-like structure also inherently generates tension on account of shrinking processes in the material, whereby the thickness of the sheet-like structure is reduced
Implementation Method 2
In order to reduce air permeability of the sheet-like structure and of the spiral sieve, filler bodies which largely occupy the void cross section of each spiral are introduced from an end side into the void cross sections of the spirals
Implementation Method 3
on account of the enlarged contact area, heat transfer from the spiral sieve to the drying medium is increased
Data Source
AI summary
A method for producing a spiral link fabric with a plurality of spirals joined to one another in an overlapping manner, with a plurality of seam wires stitched into overlapping regions of adjacent spirals and connecting the spirals to one another to form a flat structure, and with a plurality of packing elements introduced into free cross sections of the spirals, wherein the flat structure runs through a thermofixing operation before or after the introduction of the packing elements. The spirals are joined together to form the flat structure such that, before the thermofixing operation, the result is a clear width, as viewed in the plane of the flat structure, for the free cross sections of the spirals connected to one another to form the flat structure, which clear width is larger than a clear height of the free cross section of each spiral.