Winding Roll Wrap Angle Geometry for Fiber Web Tension Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for winding fiber webs, such as paper and board webs, into partial rolls face issues with sliding and tension differences between partial webs on winding rolls, leading to runnability problems and uneven tightness, which are not effectively addressed by prior solutions like tension interruption rolls that require additional devices and high maintenance.
Innovation Solution
A method and device using a multistation winder with one or two winding rolls, where the wrap angle is at least 120° and the wrap angle ratio is between 1 and 1.25, minimizing sliding issues and ensuring consistent tension by utilizing the mass of the roll and supporting the winding stations on the machine floor, eliminating the need for massive support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tension interruption roll is used to eliminate sliding and tension differences, then winding uniformity is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention removes the tension interruption roll from the winding system, eliminating the complex device while maintaining winding uniformity through optimized wrap angle geometry. The wrap angle is set to at least 120° with a ratio between 1:1.25, which naturally prevents sliding and tension differences without requiring additional interruption mechanisms.
Solution Approach 2:
The invention changes the geometric parameters of the winding system by specifying a wrap angle of at least 120° and a wrap angle ratio between 1:1.25. This parameter optimization creates favorable friction conditions that eliminate sliding and tension differences, replacing the need for mechanical tension interruption devices with geometric control.
2Stability of the object's composition
If massive support structures are used to stabilize winding stations, then winding stability is improved, but device complexity and space requirements increase
Solution Approach 1:
The invention eliminates massive support structures by utilizing the existing machine floor as the support base. The winding stations are directly mounted on the machine floor, which provides sufficient stability without requiring additional complex support frameworks, thereby simplifying the overall device structure.
3Manufacturing precision
If wrap angle is increased to at least 120° to minimize sliding, then winding uniformity is improved, but winding station configuration becomes more constrained
Solution Approach 1:
The invention optimizes the wrap angle parameter to at least 120° with a ratio between 1:1.25 for multiple winding rolls. This parameter change creates favorable friction conditions that prevent web sliding while maintaining configuration flexibility through geometric optimization rather than mechanical constraints.
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 approach minimizes sliding and tension differences, ensuring consistent and stable winding of partial web rolls with improved runnability and reduced maintenance requirements, providing a cost-effective solution for fiber web winding.
Implementation Method 1
The tightening increases when the winding roll has a soft coating. If the length of the wrap is not long enough, the web will slide on the surface of the winding roll.
Implementation Method 2
ensuring consistent tension by utilizing the mass of the roll
Data Source
AI summary
A method and apparatus for winding fiber webs, particularly paper and board webs, in which partial web rolls (R1, R2) are wound in a winding device having at least two winding stations (21, 22), where partial webs (W1, W2) are guided to rolls (R1, R2) via a nip between a winding roll(s) (12, 41, 42) and the partial web rolls (R1, R2). The partial webs (W1, W2) are guided on the surface of the winding roll(s) (12, 41, 42) before entering the nips creating a wrap angle (A1, A2) on the winding drum(s) (12, 41, 42). The wrap angles (A1, A2) of the partial webs onto the surface of the winding roll (12, 41, 42) is at least 120° and the wrap angle ratio, i.e. the relation of the larger wrap angle to the smaller wrap angle, is at least 1 and at most 1.25.