Printing Roller Sleeve Longitudinal Groove Bouncing
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Solution Overview
Problem
Flexographic printing machines experience unwanted vibrations and noise due to 'bouncing' caused by the jolts between the plate and rollers, leading to inefficient ink, glue, or varnish transfer and potential product defects, which existing solutions have not adequately addressed.
Innovation Solution
A printing roller with a sleeve featuring a longitudinal groove on its external surface, allowing the plate's leading edge to be countersunk, guiding the screen roller into contact smoothly and minimizing jolts, thus reducing bouncing and facilitating easier plate mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a plate is mounted directly on the printing roller or on a sleeve, then rapid plate replacement is achieved, but bouncing vibrations occur when the plate edges strike the rollers
Solution Approach 1:
The sleeve is designed with different local geometries: a first portion with a first diameter and a second portion with a second diameter. This local variation in dimensions allows the plate to be mounted on the sleeve while creating a gradual transition zone that reduces the impact shock when plate edges strike the rollers, thereby eliminating bouncing vibrations without compromising rapid plate replacement capability
2Object-generated harmful factors
If the plate thickness is reduced, then bouncing is minimized, but ink transfer quality deteriorates
Solution Approach 1:
The sleeve acts as an intermediary element between the plate and the printing roller. It provides mechanical support and maintains proper plate positioning while its specially designed geometry (with varying diameters) creates a cushioning effect that reduces bouncing. This allows the use of thinner plates for reduced bouncing while the sleeve compensates for any potential ink transfer quality issues by ensuring stable plate-roller contact
3Productivity
If the printing machine operates at high speed, then productivity increases, but bouncing vibrations are amplified
Solution Approach 1:
The sleeve is pre-designed with a specific geometric configuration (first portion and second portion with different diameters) that creates a gradual transition zone before the plate contacts the rollers. This preliminary geometric arrangement prepares the system to absorb and distribute impact forces smoothly, preventing the amplification of bouncing vibrations even when the printing machine operates at high speeds
Data Source
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AI summary
The present invention concerns a printing roller for a printing machine, e.g. for a flexographic printing machine, wherein the printing roller includes a rotary and longitudinal axis and an external surface, the external surface being substantially cylindrical and adapted for mounting a plate. The new feature of a printing roller according to the invention is that the external cylindrical surface includes at least one longitudinal groove, where the at least one longitudinal groove includes a geometry with one or more surfaces, the surface or surfaces lying within a circumscribed cylindrical surface for the external surface of the printing roller. In other words, this means that the longitudinal groove or grooves are cutouts in the form of milled or ground grooves in the external cylindrical surface itself on a printing roller.