Screen-Printing Cylinder With Flexible Surface Elements
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Solution Overview
Problem
Existing rotary screen printing systems face mechanical and control complexity issues due to the need for precise coordination of the screen-printing cylinder and doctor blade with the impression cylinder, leading to reduced printing speed and increased maintenance, and countersunk gripper systems cause sheet creasing problems.
Innovation Solution
A screen-printing cylinder with resilient and/or springy flexible surface elements on its shell that interact with the elevated gripper system of the impression cylinder, eliminating the need for frequent movement and reducing mechanical and control complexity, while preventing sheet creasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the screen-printing cylinder and doctor blade are periodically moved out to create space for the elevated gripper system, then collision is avoided, but mechanical and control complexity increases, printing speed decreases, and maintenance requirements increase
Solution Approach 1:
The screen-printing cylinder is equipped with flexible surface elements (such as flexible coatings or thin film layers) that can deform elastically when contacted by the elevated gripper system. This flexibility allows the cylinder surface to yield temporarily under gripper pressure, preventing collision damage while maintaining continuous contact for printing operations, thereby eliminating the need for periodic retraction mechanisms
Solution Approach 2:
The invention changes the physical parameter of the screen-printing cylinder surface from rigid to flexible by applying resilient surface elements. This parameter change allows the surface to adapt its stiffness dynamically - remaining rigid during normal printing for precision but becoming flexible during gripper contact to prevent collision, thus resolving the contradiction without complex mechanical movement systems
2Object-affected harmful factors
If the screen-printing cylinder and doctor blade are periodically moved out to create space for the elevated gripper system, then collision is avoided, but printing speed decreases
Solution Approach 1:
The flexible surface elements on the screen-printing cylinder enable continuous operation without periodic retraction. The elastic deformation capability allows the cylinder to accommodate the elevated gripper system in place, maintaining constant printing speed while preventing collision through material flexibility rather than mechanical movement
Solution Approach 2:
The invention enables continuous printing action by eliminating the periodic interruption required for cylinder retraction. The flexible surface elements allow the printing process to proceed uninterrupted while the gripper system operates in its elevated position, thereby maintaining constant productivity without collision risks
3Object-affected harmful factors
If the screen-printing cylinder and doctor blade are periodically moved out to create space for the elevated gripper system, then collision is avoided, but maintenance requirements increase
Solution Approach 1:
The flexible surface elements form a collision-prevention mechanism that requires no moving parts, actuators, or control systems. This passive elastic deformation approach eliminates the mechanical complexity of retraction mechanisms, thereby reducing maintenance requirements while still protecting against collision damage
Solution Approach 2:
The flexible surface elements provide self-service collision protection through their inherent elastic properties. The material automatically deforms and recovers without external control or actuation, creating a maintenance-free safety mechanism that continuously protects the screen-printing cylinder from gripper contact
4Object-affected harmful factors
If the gripper system is countersunk in the impression cylinder, then space for grippers is provided, but increased creasing of the guided sheet occurs
Solution Approach 1:
Instead of countersinking the grippers into the impression cylinder (which causes sheet creasing), the invention inverts the approach by keeping the grippers elevated and providing flexibility in the screen-printing cylinder instead. This reversal of the traditional solution eliminates sheet contact with recessed grippers while still preventing collision through the flexible cylinder surface
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 allows for the use of conventional impression cylinders with elevated grippers, reduces maintenance and wear, and prevents undesired sheet creasing, resulting in high-quality printed outputs.
Implementation Method 1
the screen-printing cylinder having one or more flexible surface element(s) on its cylinder shell which interact with the one or more surface element(s) projecting out of the cylinder shell of the impression cylinder
Data Source
AI summary
A screen-printing cylinder includes a cylinder shell and one or more flexible surface elements on the cylinder shell. The one or more flexible surface elements are at least one of resilient or springy, and the one or more flexible surface elements are elliptical patches or circular patches. The flexible surface elements give way upon contact with sheet grippers projecting from an impression cylinder, so that it is not necessary to move the screen-printing cylinder out to avoid contact with the sheet grippers.