Web Transfer Airguide Using Coanda Effect
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Solution Overview
Problem
Existing web transfer systems face reliability issues due to the use of consumables like adhesive tape or glue, which are affected by ambient conditions, and often result in web wrap-around problems, leading to waste and production halts.
Innovation Solution
An assembly that entrains the cut end of a web in a fluid flow using a laminar flow with a boundary layer, guided by a fluid flow guide member, creating a Coand effect to ensure the web is securely transferred to a new core without consumables, preventing wrap-around.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape or glue is used for web transfer, then the web can be transferred onto a new core, but the system becomes unreliable due to ambient condition sensitivity and increases complexity/cost of recycling
Solution Approach 1:
The patent replaces mechanical adhesive-based transfer systems (tape or glue) with a fluid dynamic system using air nozzles and Coanda effect. This substitution eliminates consumables and their sensitivity to ambient conditions, thereby improving reliability while reducing recycling complexity.
Solution Approach 2:
The invention uses pneumatic principles by directing fluid flow from air nozzles along the web surface and utilizing the Coanda effect to engage the web end with the new core. This pneumatic approach replaces chemical adhesives and eliminates the reliability issues associated with tape or glue under varying ambient conditions.
2Extent of automation
If electrostatic discharge or air nozzles are used for web transfer, then transfer can be achieved, but the end of the cut off web may not engage with the new core reliably
Solution Approach 1:
The patent applies preliminary action by directing fluid flow from air nozzles onto the web surface before the web end reaches the new core. This pre-conditioning of the web surface with fluid flow ensures that when the web end contacts the core, the Coanda effect is already established, improving engagement reliability.
Solution Approach 2:
The invention introduces fluid flow as an intermediary between the air nozzles and the web core engagement. The fluid flow acts as a mediator that carries the web end to the core and maintains engagement through the Coanda effect, ensuring reliable automatic transfer without direct mechanical contact until the engagement moment.
3Productivity
If web transfer does not engage with a new core, then wrap-around occurs, but this leads to production halts and significant waste material
Solution Approach 1:
The patent replaces unreliable mechanical transfer methods with a fluid dynamic system using the Coanda effect. This substitution ensures consistent web engagement with the new core, preventing wrap-around and the subsequent production halts and material waste that would otherwise occur.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor web transfer and engagement status. When the fluid flow successfully engages the web with the new core through the Coanda effect, the system confirms proper transfer and continues operation, preventing wrap-around conditions that would trigger production stops and waste.
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 method provides a reliable and consumable-free web transfer, preventing wrap-around and ensuring efficient production by controlling the web's movement and location immediately after cutting, thus minimizing waste and downtime.
Implementation Method 1
The fluid flow guide member has a substantially smooth surface for generating laminar flow fluid flow with a boundary layer
Implementation Method 2
the replacement web collection means is disposed in the fluid flow and has a curved surface to create a Coand effect drawing the fluid flow towards the curved surface of the replacement web collection means
Implementation Method 3
the fluid flow exiting the fluid outlet means creates a venturi effect on the ambient air around the entrainment region by drawing the ambient air into the flow of fluid being delivered along the fluid flow guide means
Data Source
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AI summary
An assembly for entraining a cut end of a web in a fluid flow, the assembly comprising an arrangement for delivering a fluid flow proximal to an entrainment region where a web is cut. The assembly further has an arrangement for guiding the fluid flow and the entrained end of the web from the web entrainment region to a web delivery region.