Corrugating Roll Asymmetric Teeth Vibration Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional corrugating rolls used in producing corrugated cardboard webs experience significant vibrations due to even-numbered subharmonic and higher harmonic frequencies, leading to suboptimal impression of fluting and increased operational noise and wear.

Innovation Solution

Designing corrugating rolls with distinct first and second corrugating teeth that differ in shape, geometry, and arrangement to minimize vibrations, including variations in crest curvature, radial height, tooth thickness, and flank angles, which reduces harmonic and subharmonic vibrations and enhances the uniformity of the corrugated web impression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional corrugating rolls with uniform corrugating teeth are used, then the corrugated web is produced with consistent fluting pattern, but significant vibrations occur due to even-numbered subharmonic and higher harmonic frequencies

Engineering Contradiction:

Improveuniformity of fluting patternVSAvoidvibrations and noise

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies asymmetry by designing corrugating teeth with different geometries - specifically, teeth with different crest curvatures, radial heights, tooth thicknesses, and flank angles. This asymmetric design breaks the symmetry that causes even-numbered harmonic vibrations, thereby reducing operational vibrations and noise while maintaining fluting pattern consistency

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent implements local quality by varying specific geometric parameters of individual corrugating teeth at different locations around the roll. Each tooth can have locally optimized dimensions - such as different crest radii or tooth heights - to distribute vibrational loads and eliminate resonant frequencies, thus reducing overall vibrations without compromising the global uniformity of the fluting pattern

Inventive Principle:

Principle #3Local quality

2Productivity

If conventional corrugating rolls operate continuously, then high productivity is achieved, but the service life of the corrugating roll is reduced due to increased wear from vibrations

Engineering Contradiction:

Improvecontinuous production capacityVSAvoidservice life of corrugating roll

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

By introducing asymmetric tooth geometries with varied crest curvatures, radial heights, and thicknesses, the patent distributes mechanical stresses more evenly across the roll operation. This reduces vibration-induced wear on any single tooth or region, thereby extending the overall service life of the corrugating roll while maintaining continuous high-speed production capability

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS10457010B2Corrugating roll

Publication Date: 2019.10.29 BHS CORRUGATED MACHINEN UND ANLANGENBAU GMBH

AI summary

The invention concerns a corrugating roll for producing a corrugated web, having a fluting, from a material web. The corrugating roll has a corrugating roll body, a central longitudinal axis, a peripheral direction about the central longitudinal axis and a surface fluting with at least one first corrugating tooth, which is arranged peripherally on the corrugating roll body, and at least one second corrugating tooth arranged peripherally on the corrugating roll body and which differs from the at least one first corrugating tooth for reducing corrugating roll operation-related vibrations.