Web Turn-Up Cutting Using X-Shaped Water Jet
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Solution Overview
Problem
Existing web cutting apparatuses in papermaking machines struggle to create stable web tail and start portions during the transfer of a continuous paper web from a forming roll to a new spool, leading to potential jams and alignment issues due to uncontrollable fluttering and uneven edge alignment, which can cause production losses.
Innovation Solution
A web turn-up cutting apparatus using two water nozzles mounted on transversely movable carriages to create a substantially X-shaped cut, forming a stable V-shaped tail and start with detachable wings and a middle strip, ensuring stable and uniform re-threading by applying adhesive to the wings and middle strip for secure engagement with the spool and drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pointed start is formed by water jets traveling from center to edge, then the web portion tightly engages the new spool, but the notched tail becomes loose and uncontrollably flutters causing jams and production loss
Solution Approach 1:
The patent applies asymmetry by forming an oblique cut start instead of a symmetric pointed start. The cut is made at an angle rather than symmetrically from the center, creating an asymmetric geometry that prevents uncontrolled fluttering while maintaining tight engagement with the spool. This asymmetric cut pattern stabilizes both the start and tail portions simultaneously.
2Object-generated harmful factors
If an oblique cut start is formed to reduce fluttering, then tail stability improves, but web edge alignment problems and wrinkles occur on the forming roll
Solution Approach 1:
The patent applies dynamics by making the cut pattern adaptive rather than fixed. The water jets traverse the web width while the web itself is moving at high speed, creating a dynamic cutting process. The oblique cut is formed by the relative motion between the jets and the moving web, allowing the cut geometry to be optimized for both stability and alignment simultaneously through controlled jet traversal during web motion.
3Productivity
If the web is cut at very high speed (2000 meters per minute), then production efficiency is maintained, but the cutting apparatus must produce a precise cut without causing jams or interruptions
Solution Approach 1:
The patent replaces traditional mechanical cutting systems with water jet cutting technology. Water jets can cut the web at very high speeds (2000 meters per minute) without the mechanical contact and vibration problems that cause jams in traditional blade-based systems. The water jets deliver precise cuts through fluid dynamics rather than mechanical force, maintaining both high productivity and cutting stability.
Solution Approach 2:
The patent uses hydraulic principles by employing water jets under pressure to cut the moving web. The high-speed water jets traverse the web width while cutting, using fluid pressure and flow control to maintain precise cutting at production speeds. This hydraulic cutting method eliminates the mechanical contact issues that would cause interruptions at high web speeds.
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 apparatus effectively stabilizes the web tail and start portions, preventing jams and ensuring uniform alignment, thereby reducing production losses and maintaining continuous paper production without interruptions.
Implementation Method 1
a first and second nozzles that are each connectable to a respective water supply hose and adapted to produce a respective water cutting jet
Implementation Method 2
The dispenser applies the adhesive material onto the turn-up start so as to provide an instant engagement of the start with the new spool
Data Source
AI summary
A web turn-up cutting method and apparatus for severing a continuous web has a water jet controller adapted to activate a water supply of first and second water nozzles and a carriage controller adapted to actuate the nozzle carriages to provide a transversal movement of the first and second water nozzles. The first and second nozzles are adapted to define together a substantially X-shaped cut on the traveling continuous web defining at least a substantially V-shaped tail for ending a forming roll, an opposite substantially V-shaped start for starting a new spool, a detachable first wing and a detachable second wing.