Paper Web Turn-Up Symmetry via V-Cut and Adhesive Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The turn-up process in paper manufacturing often faces issues with web symmetry, flapping, and tail material breakage due to wing portions created by X-shaped cuts, requiring special operator attention and disposal.
Innovation Solution
Implementing a method and apparatus that use V-shaped or Y-shaped cuts to transfer the paper web onto a new roll from both sides, forming symmetric leader portions with adhesive application and air jet assistance to ensure stable and secure transfer, reducing flapping and material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an X-shaped cut is performed using water knives to create two wing portions, then the paper web can be cut and transferred, but the wing portions interfere with the turn up process and require special operator attention for disposal
Solution Approach 1:
The patent removes the harmful wing portions by changing the cutting pattern from X-shaped to V-shaped or Y-shaped cuts. The cutting tool enters at an outer lateral edge and terminates before reaching the centerline, extracting only the necessary material removal while leaving a clean tail portion that does not interfere with the turn-up process.
Solution Approach 2:
Instead of creating wing portions that extend outward and require disposal, the invention inverts the approach by making cuts that terminate before the centerline, creating a clean tail that naturally feeds onto the new roll without interference. This reverses the traditional X-cut geometry to eliminate the problem.
2Productivity
If an X-shaped cut is performed, then the paper web can be cut, but the tail material is prone to flapping and breaking off
Solution Approach 1:
The patent extracts only the necessary material removal by cutting from the outer lateral edge toward but not reaching the centerline. This creates a clean tail portion with sufficient length that remains stable and does not flap or break off during the turn-up process, while still achieving the required web transfer.
Solution Approach 2:
The invention inverts the traditional X-cut approach by making cuts that terminate before the centerline intersection. This creates a stable tail configuration rather than leaving exposed wing portions, reversing the geometry to improve tail material reliability and prevent flapping and breaking.
3Manufacturing precision
If a V-shaped or Y-shaped cut is used to cause turn up from both sides, then web symmetry is improved, but additional adhesive application and air jet systems are required
Solution Approach 1:
The patent applies adhesive to the paper web before the cutting operation, specifically in the area that will become the tail portion. This preliminary adhesive application ensures proper adhesion during the turn-up process without requiring complex additional systems, while the V-shaped or Y-shaped cut geometry provides the desired web symmetry.
Solution Approach 2:
The invention introduces adhesive as an intermediary substance to facilitate the turn-up process. The adhesive applied to the tail portion enables reliable adhesion to the new roll, working in conjunction with the V-shaped or Y-shaped cut geometry to achieve symmetric web feeding without requiring complex air jet or other auxiliary systems.
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 method and apparatus provide improved web symmetry and stability, reducing the likelihood of flapping and material breakage, resulting in a more efficient and stable production process with reduced waste.
Implementation Method 1
using a cutting tool, preferably a water jet cutting tool arranged to cut the paper web on a roll at two or more points
Implementation Method 2
Adhesive spray or tape can be applied to the paper web in the area of the leader portions
Implementation Method 3
a plurality of air jets to bias the two or more leader portions towards a surface of the new roll
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A paper-making machine and process, in which a paper web passes over a pope roller to a main roll and a new roll can be brought into contact with the pope roller when the main roll becomes a full roll, is improved by arranging at least two paper cutting tools to cut a paper web from each of two outer lateral edges to form two or more leader portions. A tail of the paper web formed on the full roll is symmetric and the leader portions on the new roll are also symmetric. Adhesive spray or tape can be applied to the paper web in the area of the leader portions. Air jets can also be used to bias the leader portions towards a surface of the new roll.