Cross-Machine Cutting Device for Paper Web Stabilization
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Solution Overview
Problem
High-speed papermaking machines face challenges in stabilizing the material web during cutting, leading to web breaks and oscillations, and the use of air guide boxes complicates edge severing, reducing available free web areas and making clean cuts difficult.
Innovation Solution
An apparatus with a cutting device and air guide box fixed to an upper holding device, allowing for cross-machine direction movement, and a cutting table that can be moved vertically or in the cross-machine direction, along with a synchronizing mechanism to coordinate movements, enables precise cutting near the air guide box without obstructing other machine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air guide boxes are used to stabilize the material web at high speeds, then web stability is improved, but the available free web area for cutting is reduced and web bulging occurs
Solution Approach 1:
The cutting device is positioned above the material web in the vertical dimension, performing cuts in the cross-machine direction while the air guide box stabilizes the web in the machine direction. This dimensional separation allows both stabilization and cutting to occur simultaneously without interfering with each other's required space.
Solution Approach 2:
The cutting device is made movable in the cross-machine direction, allowing it to dynamically adjust its position and perform cutting operations in the limited free web area without requiring a large static space. The movement capability enables the cutting device to adapt to the constrained space while maintaining effective cutting function.
2Stability of the object's composition
If air guide boxes are used for web stabilization, then web oscillations are reduced, but web bulging after the air guide box makes clean cutting more difficult
Solution Approach 1:
The cutting operation is performed before the material web passes through the air guide box. By completing the cutting action in advance, the invention avoids the web bulging that occurs after the air guide box, ensuring clean cuts are made when the web is still stable and flat.
Solution Approach 2:
The cutting device operates in the cross-machine direction from above the web, creating a different spatial approach compared to traditional end-side cutting. This vertical cutting approach allows precise cuts to be made in the stabilized web region before bulging occurs downstream of the air guide box.
3Area of stationary object
If cutting devices and air guide boxes are placed in restricted spaces, then space utilization is improved, but the components hamper each other and cannot be employed
Solution Approach 1:
The cutting device is positioned above the material web and operates in the cross-machine direction, while the air guide box is positioned downstream in the machine direction. This vertical and directional separation in three-dimensional space allows both components to coexist in restricted spaces without hampering each other's function.
Solution Approach 2:
The cutting device is designed to be movable in the cross-machine direction, allowing it to dynamically position itself and perform cutting operations without requiring fixed installation space that would conflict with the air guide box. This mobility enables both components to share restricted space effectively.
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 setup stabilizes the material web during cutting, allows for clean cuts in restricted spaces, and enhances flexibility in cutting operations by coordinating the cutting device and table movements, ensuring precise and efficient edge severing.
Implementation Method 1
an air guide box (40) and the air guide box (40) being fixed above the material web (10)
Implementation Method 2
a high-pressure water jet is preferably used for the cutting
Data Source
AI summary
The invention relates to an apparatus and method for cutting a material web in a papermaking machine. The apparatus includes a cutting device, an upper holding device and an upper positioning device. The cutting device is fixed above the upper positioning device on the upper holding device such that it can be moved in the cross-machine direction. The apparatus additionally has an air guide box and the air guide box is fixed above the material web, likewise on the upper holding device. Furthermore, the apparatus has a cutting table fixed to a lower holding device via a first and/or a second lower positioning device. The cutting table is movable substantially vertically with respect to the material web via the first lower positioning device and/or movable in the cross-machine direction via the second lower positioning device.