Flexographic Machine Spooling System for Bidirectional Winding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional flexographic machines face challenges in maintaining constant tension of fine and extensible materials, handling large diameter printing plate cylinders, quickly changing printing plates, adjusting pressure between rollers, drying materials without causing air bubbles, and efficiently winding printed spools, leading to quality issues and increased operational costs.
Innovation Solution
A flexographic machine with improved functionality includes an assembly for unwinding, printing, drying, and spooling, featuring lightweight aluminum printing plate cylinders with magnetic attachment for quick plate changes, precise pressure adjustment, low-temperature air drying with a movable mat to prevent bubbles, and a spooling system for automatic core loading and unwinding in both directions, ensuring constant tension and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gravity-actuated dandy rolls are used for tension control, then tension adjustment is possible, but tension constancy deteriorates due to low manufacturing accuracy
Solution Approach 1:
The patent replaces the mechanical gravity-actuated dandy roll system with an electronic feedback control system using sensors and actuators. This substitution eliminates the dependency on mechanical manufacturing accuracy and enables precise, dynamic tension control through electronic regulation, directly resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The patent implements a feedback control system that continuously monitors tension and adjusts it in real-time. This feedback mechanism compensates for variations and maintains constant tension regardless of the underlying mechanical system's manufacturing accuracy, directly addressing the contradiction by prioritizing control precision over component precision.
2Productivity
If large diameter printing plate cylinders are used to increase print repeat, then print repeat increases, but machine structural stress increases beyond design limits
Solution Approach 1:
The patent employs composite material construction for the printing plate cylinder, combining materials with different properties to achieve both large diameter and lightweight structure. This allows the cylinder to provide the necessary print repeat while the composite structure reduces inertia and structural stress on the machine, resolving the contradiction between productivity and stress.
Solution Approach 2:
The patent changes the physical parameters of the printing plate cylinder by using lightweight materials and optimized structural design. This allows the cylinder to maintain a large diameter for increased print repeat while reducing its mass and inertia, thereby decreasing the structural stress and dynamic loads on the machine beyond design limits.
3Ease of operation
If printing plates are changed manually, then plate changing is possible, but productivity decreases due to machine downtime
Solution Approach 1:
The patent implements a self-service plate changing system where the machine automatically performs plate removal, cleaning, and installation without operator intervention. This automation eliminates machine downtime associated with manual plate changing while maintaining ease of operation through simple programming or automatic detection, resolving the contradiction between ease of operation and productivity.
Solution Approach 2:
The patent prepares the next printing plate in advance during the printing process, performing preliminary actions such as plate warming, alignment preparation, and positioning. This allows the actual plate changing operation to be performed rapidly with minimal machine downtime, simultaneously maintaining ease of operation and improving productivity.
4Ease of operation
If mechanical abutments are used for pressure adjustment, then pressure adjustment is possible, but operation complexity increases requiring expert operators
Solution Approach 1:
The patent replaces the mechanical abutment system with an electronic control system using sensors and actuators. This substitution simplifies the user interface to electronic controls that can be programmed or automatically adjusted, eliminating the need for complex mechanical adjustments by expert operators and resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The patent implements feedback control for pressure adjustment, where sensors monitor the actual pressure and the system automatically adjusts to maintain the desired setpoint. This eliminates the need for complex manual mechanical adjustments and expert knowledge, making the system easy to operate through simple electronic controls while maintaining precise pressure regulation.
5Productivity
If high speed air drying is used to dry ink, then drying speed increases, but harmful effects increase due to sail effect and air bubbles
Solution Approach 1:
The patent changes the drying parameters by using lower air velocity and controlled temperature instead of high-speed air flow. This parameter modification eliminates the sail effect and air bubble formation while maintaining effective drying through optimized thermal and airflow conditions, resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The patent employs periodic or staged drying action, where air flow and heating are applied in controlled intervals or stages rather than continuously at high intensity. This periodic approach allows the material to dry effectively without experiencing the harmful sail effect and air bubble formation associated with continuous high-speed air flow, balancing productivity with quality.
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 machine enables rapid, reliable, and efficient printing and spooling of fine and extensible materials with improved tension control, simplified plate changes, precise pressure adjustment, bubble-free drying, and automated spooling, addressing the drawbacks of traditional machines while reducing operational costs and downtime.
Implementation Method 1
The printing plate cylinder (16) is provided with a magnet assembly adapted to hold a printing plate
Implementation Method 2
a movable mat (29) arranged inside the drying tunnel (25) and adapted to support the film (4) during drying
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A flexographic machine (1) with increased functionality, particularly for printing fine and extensible material, comprising: - an assembly (2) for unwinding a spool (3) of a film (4) of material to be printed along a printing path, - at least one assembly (5) for printing the film (4) in output from the unwinding assembly (2), - at least one assembly (6) for drying the film (4) in output from the printing assembly (5), and - an assembly (7) for spooling the film (4) in output from the at least one drying assembly (6); the spooling assembly (5) comprises a presser roller (31) that is adapted to fix the film (4) on a spooling cylinder (32) intended to make contact with a core (9) onto which the film (4) is to be wound in a roll (11); the presser roller (31) is arranged in front of the spooling cylinder (32) with respect to the advancement direction of the film (4) and is provided with means (34) for movement away from the spooling cylinder (32) and for approach until contact with the spooling cylinder (32), so as to allow the selective placement of the film (4) on one of the two sides of the presser roller (31) and allow the winding of the roll (11) of printed film (4) selectively along a clockwise or counterclockwise direction.