Chamber Frame Pressing Device for Flexo Printer Ink Uniformity
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Solution Overview
Problem
In chamber blade-type flexo printers, the printing roll is subjected to a load from corrugated paperboards, causing the anilox roll and chamber frame to vibrate, leading to uneven ink transfer and printing inaccuracies due to bending, especially when printing larger sheets.
Innovation Solution
A corrugated paperboard printer with a pressing device that applies a first and second pressing force to different areas of the chamber frame, reducing bending and ensuring consistent ink transfer by adjusting the pressure distribution to match the load applied during printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the printer width is increased to accommodate larger corrugated paperboard sheets, then the printing capacity is improved, but the chamber frame bends more under load causing uneven ink transfer
Solution Approach 1:
The pressing device applies different pressing forces to different regions of the chamber frame back surface. Specifically, the central region receives a greater pressing force than the lateral regions, creating a non-uniform pressure distribution that compensates for the bending deformation occurring in the center under printing load, thereby maintaining overall dimensional stability and uniform ink transfer across the entire printing width
Solution Approach 2:
The pressing device dynamically adjusts the pressing force parameter applied to the chamber frame. By increasing the pressing force in the central region where bending is most severe, the system compensates for the dimensional changes caused by load-induced bending, maintaining printing accuracy across the entire width without requiring structural reinforcement
2Adaptability or versatility
If the chamber frame width is increased to match the printing width, then the printing versatility is improved, but the bending deformation increases under operational load
Solution Approach 1:
The pressing device applies a preliminary pressing force to the chamber frame back surface before the printing operation begins. This pre-applied force, particularly concentrated in the central region, creates an initial compressive stress state that counteracts the tensile bending stresses that will occur during printing, preventing excessive deformation and maintaining frame stability throughout the printing process
Solution Approach 2:
Different regions of the chamber frame back surface receive different pressing forces according to their specific bending characteristics. The central region, which experiences the most severe bending, receives the highest pressing force, while the lateral regions receive progressively less force, creating a localized compensation strategy that maintains overall frame stability without over-constraining any single region
3Manufacturing precision
If the doctor blade contact force on the anilox roll varies due to chamber frame bending, then the ink thickness uniformity deteriorates, but increasing the pressing force uniformly may cause other issues
Solution Approach 1:
The pressing device creates a non-uniform pressing force distribution across the chamber frame back surface, with the central region receiving greater force than the lateral regions. This localized differentiation in pressing force directly compensates for the non-uniform bending deformation pattern, ensuring that the doctor blade maintains consistent contact force with the anilox roll across its entire width, thereby producing uniform ink thickness without requiring complex active control systems
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 solution effectively suppresses bending of the chamber frame, improving printing accuracy and consistency by maintaining even ink thickness on the anilox roll, thereby enhancing the quality of printed corrugated paperboards.
Implementation Method 1
bending occurring in the chamber frame due to a load transmitted from the printing roll to the chamber frame via the anilox roll
Data Source
AI summary
Disclosed is a corrugated paperboard printer comprising a pressing device for applying a pressing force to press a chamber which reserves ink toward an anilox roll. The pressing device is configured to apply a first pressing force, and a second pressing force which is greater than the first pressing force, respectively, to a first pressing area and a second pressing area in a back surface of a chamber frame. In a state in which no pressing force is applied by the pressing device, bending occurring in the chamber frame due to a load transmitted from a printing roll to the chamber frame via the anilox roll as printing is performed to a corrugated paperboard sheet is greater in the second pressing area than in the first pressing area.