Web Processing Machine Fluting Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing printing material web processing machines suffer from fluting issues, where the web forms waves and corrugations during drying due to tensile stress, leading to visible defects in finished products, and previous solutions either fail to prevent fluting effectively or increase costs with expensive cambered rolls and complex meander-like paths.
Innovation Solution
A printing material web processing machine with a press cylinder, a dryer, and a pull roll, where the pull roll is driven at a reduced rotational speed compared to the press cylinder, allowing for low tensile stress and a meander-like path with small radii of curvature, preventing or minimizing fluting waves without the need for expensive cambered rolls or complex path configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the web is guided along a meander-like path with guide surfaces, then fluting is prevented, but disruptive contact between the web and surfaces occurs and threading becomes more difficult
Solution Approach 1:
The patent extracts the web from contact with guide surfaces by introducing an air cushion between the web and the meander-like path structure. This eliminates disruptive contact while preserving the meander path's fluting-prevention capability, and simplifies threading by removing mechanical contact points.
Solution Approach 2:
An air cushion acts as an intermediary between the web and the meander-like path structure. This air layer allows the web to follow the desired curved path without direct contact, preventing both fluting and disruptive contact simultaneously.
2Manufacturing precision
If expensive cambered rolls or complex meander-like paths are used, then fluting is minimized, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical guide surfaces and cambered rolls with a pneumatic system (air cushion). This substitution maintains the ability to create meander-like paths for fluting prevention while significantly reducing mechanical complexity and cost.
Solution Approach 2:
The patent changes the state of the web from direct mechanical contact to aerodynamic suspension. By changing the interaction parameter from solid contact to air cushion support, the system achieves fluting prevention without complex mechanical structures.
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 solution effectively prevents or minimizes fluting by reducing tensile stress and guiding the web along a meander-like path with small radii of curvature, ensuring high-quality printed products without visible defects and reducing operational costs.
Implementation Method 1
The web guided through a dryer under tensile stress, that is to say a longitudinal web stress, forms waves, peaks and valleys of the waves extending in the web transport direction and corrugation of the web transverse to the transport direction being produced.
Data Source
AI summary
A printing material web processing machine, in particular a web-fed rotary offset press, has at least one press cylinder for printing the web, a dryer disposed downstream of the press cylinder, which guides the web along a path, and at least a first pull roll disposed downstream of the dryer to convey the web along the path with a given tensile stress. The web processing machine further has a first apparatus disposed downstream of the press cylinder and upstream of the dryer for separating the web from the press cylinder, and a second apparatus for driving the first pull roll, which drives the first pull roll at a rotational speed that is reduced as compared with the rotational speed of the press cylinder.