Drying Device Profile Control for Printing Unit Dampening Solution
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Solution Overview
Problem
Existing printing technologies face challenges in achieving high print quality across large areas due to limitations in the variability and gradation of ink application, particularly in zonally adjustable dampening solution distribution, leading to quality losses with varying ink requirements.
Innovation Solution
A device and method for setting and changing the profile of the dampening solution guide across the printing width, utilizing a drying device with independently adjustable axial sections and blower elements that can overlap and be pulsed to precisely control dampening solution removal, ensuring consistent ink application across the printing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a drying device with independently adjustable axial sections is used to control dampening solution removal, then print quality is improved across large areas, but device complexity increases
Solution Approach 1:
The drying device is divided into multiple independently adjustable axial sections, each capable of being activated or deactivated individually. This segmentation allows precise control of dampening solution removal across different zones of the printing width, enabling high print quality across large areas while maintaining manageable device complexity through modular design
Solution Approach 2:
Each axial section of the drying device can be independently adjusted to provide locally optimized dampening solution removal. This local quality control allows the device to adapt to varying ink requirements across different zones, improving print quality without requiring complete redesign of the entire system
2Manufacturing precision
If blower elements are pulsed to precisely control dampening solution removal, then ink application consistency is improved, but control system complexity increases
Solution Approach 1:
The blower elements are operated in a pulsed manner rather than continuously, with individual axial sections being activated and deactivated in periodic cycles. This periodic action allows precise control of dampening solution removal timing and quantity, improving ink application consistency while the control system manages complexity through programmed sequences
Solution Approach 2:
The drying device incorporates dynamic control capabilities where the activation state of each axial section can be changed during operation. This dynamics allows the system to adapt to varying printing conditions and maintain ink application consistency across different color densities without requiring a completely rigid control architecture
3Adaptability or versatility
If greater variability in blowing force is allowed, then gradation of axial progression is improved, but control precision requirements increase
Solution Approach 1:
The system allows variation of blowing force parameters across different axial sections to achieve finer gradation of dampening solution removal. By changing parameters such as air pressure and flow rate independently for each section, the device achieves improved adaptability while control precision is maintained through individual parameter optimization for each zone
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
This solution enhances print quality by allowing greater variability in blowing force and finer gradation of axial progression, achieving high quality at both high and low color densities, even with small ink amounts, by independently adjusting the effect of each axial section.
Implementation Method 1
a drying device which extends across the printing width and has a plurality of drying elements, through the action of which on a surface of the printing unit to be treated dampening solution can be removed
Data Source
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AI summary
The invention relates to a device for adjusting and/or changing a damping medium profile, which extends in the direction of a printing width, in a printing unit (11, 21) comprising at least one printing unit cylinder (13, 19), at least one inking unit (17) which inks the printing unit cylinder (13, 19), and at least one damping unit (18) which interacts with the printing unit cylinder (13, 19) and/or the inking unit (17). A drying device (39) which extends over the printing width is provided with a number I (I e N, I>1) of drying elements (41k), the influence of which on a printing unit (11, 21) surface (F) to be treated allows moisture to be removed from a number of n (n e N, n>1) axial portions aj(j = 1,..., n) that are offset relative to one another in the direction of the printing width and the extent of the influence of which with respect to the axial portion (aj) and/or the operating state of which can be varied independently of one another. The drying elements (41k) are designed and arranged in the printing unit (11; 21) such that at least 20% of the width (bj), when seen in the direction of the printing width, of multiple or all of the axial portions (aj), which are designed as active portions (aj) with an active width (bj) of the drying elements (41k) in the printing unit (11; 21), over the extension of said portions overlaps with an adjacent axial portion of the axial portions (aj), which are axially offset relative to one another in the direction of the printing width, and/or a controller (46) and switching and/or adjusting means (47v) which are connected to the controller for signaling purposes are provided, said controller and switching and/or adjusting means being used to operate multiple or all of the drying elements (41k) during a stationary active operating state such that each of the drying elements is pulsed, i.e. individually clocked between an "off" switching state and an "on" switching state.