Digital Printing Substrate Braking and Traction Control
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Solution Overview
Problem
Existing digital printing systems for large-format substrates face challenges in achieving accurate and stable printing due to uncontrollable slip thrusts during winding, which lead to lateral displacement and axial misalignment of the substrate, especially when dealing with thin or delicate materials, and require a compromise between anchoring and traction actions to maintain integrity and precision.
Innovation Solution
A braking action is applied between the belt conveyor and the traction unit to stabilize the substrate, counteracting traction forces and ensuring ordered winding and precise printing, while reducing the intensity of anchoring actions to prevent damage to delicate substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If anchoring action is increased to ensure substrate stability during printing, then printing precision is improved, but substrate damage occurs on thin and delicate materials
Solution Approach 1:
The transport system is divided into three independent zones: anchoring zone (first conveyor) for printing stability, intermediate zone (second conveyor) for substrate transition, and traction zone (third conveyor) for winding control. Each zone can be independently controlled, allowing the anchoring action to be limited to only the printing area while the intermediate zone provides a buffer to prevent force transmission to the substrate.
Solution Approach 2:
The intermediate conveyor acts as a mediator between the anchoring conveyor and the traction conveyor. It receives the substrate from the anchoring zone and transfers it to the traction zone, decoupling the strong anchoring forces from the substrate and preventing force transmission that would cause damage to delicate materials.
2Quantity of substance
If traction action is increased to achieve compact winding, then winding density is improved, but printing accuracy deteriorates due to substrate displacement
Solution Approach 1:
The system segments the traction action into a dedicated zone (third conveyor) separated from the printing zone by the intermediate conveyor. This allows strong traction forces to be applied for compact winding without transmitting displacement forces to the printed substrate, as the intermediate conveyor absorbs and isolates these forces.
Solution Approach 2:
The intermediate conveyor performs the preliminary action of receiving and stabilizing the substrate before it enters the high-traction winding zone. This preliminary stabilization ensures that the substrate is properly positioned and isolated from subsequent traction forces that would otherwise cause printing inaccuracies.
3Ease of manufacture
If substrate path length is increased for additional treatments, then treatment quality is improved, but winding orderliness deteriorates due to slip thrusts
Solution Approach 1:
The system segments the substrate path into distinct functional zones: printing zone, treatment zone (with extended path for drying/finishing), and winding zone. The intermediate conveyor connects these zones, allowing the treatment path to be extended without transmitting instability from the winding zone back to the treatment area, thus maintaining both treatment quality and winding orderliness.
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 braking action stabilizes the substrate's lateral positioning, facilitates orderly collection, and enhances printing precision by maintaining a stable position during high-resolution graphic motifs, allowing for reduced anchoring intensity and increased traction when necessary for compact winding.
Implementation Method 1
said braking unit comprises a slide plate configured to be slidingly skimmed by the substrate and having a plurality of through openings; said braking unit comprises a suction chamber delimited by said slide plate; said braking unit comprises a suction unit configured to create a vacuum inside the suction chamber
Data Source
AI summary
A substrate in the form of a continuous sheet is fed towards a belt conveyor and is lied out on the conveyor itself. By means of the belt conveyor, the substrate is moved along a feed direction, while a printing unit operating above the belt conveyor realizes a print pattern on the substrate. The printed substrate is withdrawn by a traction unit operating downstream of the belt conveyor. In a section of its longitudinal extension between the belt conveyor and the traction unit, the substrate is subjected to a braking action to retain the substrate in contrast to traction actions induced on the same by the traction unit. A drying group operates on the substrate in the area affected by the braking action, with a combined action of radiation and ventilation.