Modular Pressure Roller Sleeve Adaptation for Printing Substrates
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Solution Overview
Problem
Printing material webs, especially stretchable plastic films, often suffer from wrinkles and damage when pressed onto central impression cylinders due to the surface properties and geometric characteristics of pressure rollers, leading to registration errors and material waste.
Innovation Solution
A modular pressure roller system comprising a mandrel and interchangeable sleeves with varying surface properties, Shore hardness, and geometric designs, allowing for selection based on the material type to minimize damage, and featuring a hydraulic or pneumatic locking mechanism for easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure roller with fixed surface properties is used to press the printing material web onto the impression cylinder, then the web can be secured and printed, but the web suffers from wrinkles and damage due to incompatible surface properties
Solution Approach 1:
The pressure roller is divided into a mandrel and interchangeable sleeves. The sleeve can be removed and replaced independently to match different printing material properties, allowing optimization of surface properties for each material type to prevent wrinkles and damage.
Solution Approach 2:
Different sleeves with varying surface properties (material composition, surface geometry, hardness) are provided to match different printing materials. By changing the sleeve, the surface parameters of the pressure roller are adapted to the specific material being printed, preventing wrinkles and damage while maintaining reliable web handling.
2Object-affected harmful factors
If the pressure roller surface properties are changed to suit different printing materials, then material damage is reduced, but the complexity of the pressure roller system increases
Solution Approach 1:
The pressure roller is segmented into a mandrel and interchangeable sleeves. This segmentation allows the complex requirement of having multiple surface properties to be solved by providing multiple simple sleeve components rather than creating a complex integrated structure.
Solution Approach 2:
The mandrel serves as a universal base component that can accommodate different sleeves. The sleeve acts as a universal interface between the mandrel and various printing materials, allowing one mandrel design to work with multiple material types through sleeve interchangeability.
3Object-affected harmful factors
If the entire pressure roller is replaced when surface properties need to change, then the correct surface properties are achieved, but machine downtime increases significantly
Solution Approach 1:
The pressure roller is segmented into a mandrel and interchangeable sleeves. Only the sleeve needs to be replaced when surface properties need to change, not the entire pressure roller. This segmentation reduces replacement time and minimizes machine downtime while achieving the correct surface property matching.
Solution Approach 2:
The sleeve is extracted as a separate, replaceable component from the pressure roller system. This extraction allows the sleeve to be independently replaced without affecting the mandrel or other components, significantly reducing the time required to change surface properties.
4Object-generated harmful factors
If a pressure roller with grooves is used to press stretchable plastic films, then air can be pressed out between film webs, but thin films suffer from damage due to hard surfaces
Solution Approach 1:
Different sleeves with different local surface qualities (grooved or smooth, different hardness levels) are provided to match different printing materials. For stretchable plastic films, a grooved sleeve with appropriate hardness is used to press out air. For thin films, a smooth sleeve with lower hardness is used to avoid damage, allowing local optimization of surface properties.
Solution Approach 2:
The surface parameters of the pressure roller (geometry and hardness) are changed by replacing the sleeve. For stretchable plastic films, a sleeve with grooves and higher hardness is selected to press out air. For thin films, a sleeve with smooth surface and lower hardness is selected to prevent damage, allowing parameter optimization for each material type.
Data Source
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AI summary
The invention relates to a printing machine (3) for printing on a substrate (1), said machine (3) comprising the following features: - the central counter-pressure cylinder (2), - means for advancing the substrate (1) to the central counter-pressure cylinder (2), a pressure roller (4) for pressing the substrate (1) against the central counter-pressure cylinder (4), and - a plurality of impression cylinders (D1...D6) that can be applied to the central counter-pressure cylinder (4). The pressure roller (4) can be assembled from a mandrel (12) and at least one sleeve.