Non-linear Edge Cylindrical Sleeves for Flexographic Printing
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Solution Overview
Problem
The production of cylindrical sleeves for flexographic printing is hindered by difficulties in creating seams that ensure an air-tight seal without excess material buildup, leading to print defects like 'print through' and increased manufacturing time and costs, especially when trying to reuse these sleeves for subsequent print runs.
Innovation Solution
A method involving wrapping sheets of material with non-linear edges to form a discontinuous seam, which minimizes contact between overlapping portions and gap portions, allowing for easy assembly and reducing the likelihood of print defects by distributing discontinuity along the seam, thus enabling efficient and cost-effective production of sleeves that can withstand pressurized air mounting and demounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If seams are created by joining edges of material to form cylindrical sleeves, then the sleeves can be manufactured with controlled dimensions, but excess material buildup at seams causes print defects like 'print through' and requires time-consuming precision alignment
Solution Approach 1:
The patent applies asymmetry by using non-linear edges (such as zigzag or scalloped patterns) instead of straight edges for joining material. This asymmetric edge design allows the seams to interlock and distribute material buildup evenly around the cylinder, eliminating the need for precise linear alignment while maintaining dimensional control and reducing print defects.
2Productivity
If thin-walled cylindrical sleeves are used to reduce manufacturing costs and increase production, then the sleeves become more cost-effective and easier to handle, but they may lack the strength to withstand pressurized air mounting and demounting
Solution Approach 1:
The patent employs composite materials by combining multiple material layers with different properties within the thin-walled sleeve structure. This allows the sleeve to maintain thin wall thickness for cost-effectiveness and ease of handling while the composite construction provides enhanced structural strength to withstand pressurized air mounting and demounting operations.
3Reliability
If seams are made with sufficient material contact to ensure air-tight seal, then the sleeves can maintain air pressure for mounting, but excess material buildup at seams transmits through print forms causing printing defects
Solution Approach 1:
The non-linear edge design creates an asymmetric seam structure that distributes material contact and buildup evenly around the cylinder circumference. This prevents localized excess material accumulation that would cause print through defects while maintaining sufficient overall material contact to ensure air-tight sealing for pressurized mounting.
4Ease of manufacture
If flat plates are hand-mounted onto print cylinders by wrapping and adhering, then the plates can be relatively thin and flexible, but the mounting process is labor intensive and plates cannot be easily removed for reuse
Solution Approach 1:
The patent utilizes pneumatic principles by designing the cylindrical sleeve to be mounted and demounted using pressurized air. The thin-walled sleeve structure allows air pressure to expand the sleeve for easy mounting onto the print cylinder and contraction for simple removal, enabling rapid reuse without labor-intensive hand-mounting processes.
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 approach simplifies the manufacturing process, reduces print defects by minimizing seam-related issues, and allows for the production of sleeves with consistent dimensions and tolerances, enabling seamless integration of imageable materials and maintaining print quality across multiple print runs.
Implementation Method 1
Compressed air is connected to the print cylinder which passes into the interior of the cylinder and emerges via holes arranged on the exterior surface of the cylinder to create an air cushion for mounting and de-mounting the sleeve
Implementation Method 2
Since the sleeve expands slightly under the influence of the air cushion, the sleeve easily slides along the print cylinder to the desired position. When the compressed air is terminated, the sleeve no longer can stay expanded and contracts to reside firmly on the print cylinder
Data Source
AI summary
This invention pertains to a method for making a cylindrically-shaped element, and particularly a cylindrically-shaped element for use as a base sleeve for printing or as a support for a print form. The method includes wrapping a sheet of a material having a first end and a second end to bring the second end adjacent the first end to form a base sleeve having an axial seam of the first and second ends. The first end has a non-linear edge having an amplitude. Portions between the first end and the second end overlap and form the axial seam. The method can include applying an imageable material adjacent an exterior surface of the base sleeve that covers at least a portion of the axial seam.