Elastic Pad Roller for Differentiated Glue Application in Paper Rewinding
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Solution Overview
Problem
The existing rewinding machines face challenges in achieving optimal gluing of the first sheet on the core versus the final flap of paper logs, as the glue requirements differ significantly between the two stages, necessitating a precise and differentiated application to ensure proper bonding and handling without causing damage or waste.
Innovation Solution
A rewinder and method that utilize distinct glues of varying viscosity and formulation for the initial and final flap gluing, with a pad-holder roller system that applies glue cyclically and elastically to ensure precise distribution and prevent uncontrollable spreading, allowing for different types and viscosities of glue to be used for each stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single glue application system is used for both the first sheet and final flap, then the device complexity is reduced, but the gluing quality and reliability are compromised due to different glue requirements
Solution Approach 1:
The glue application system is divided into two independent subsystems: a first glue application device for applying initial glue to the first sheet on the core, and a second glue application device for applying final glue to the closing flap. This segmentation allows each subsystem to use glue with optimized properties for its specific function, resolving the contradiction between device simplicity and gluing quality.
Solution Approach 2:
Different glue characteristics are applied to different locations in the process: lighter glue with lower viscosity is used for the initial sheet gluing where flexibility and ease of detachment are needed, while firmer glue with higher viscosity is used for the final flap where strong bonding is required. This local differentiation of material properties resolves the contradiction.
2Ease of operation
If light glue is used for the first sheet gluing, then the ease of detachment is improved, but the bonding strength is reduced
Solution Approach 1:
The glue parameters (viscosity, formulation, weight) are changed between the two gluing stages. The first glue application uses lighter glue with lower viscosity to facilitate easy detachment and web guidance, while the second glue application uses firmer glue with higher viscosity to ensure strong bonding of the final flap. This parameter differentiation resolves the contradiction between ease of detachment and bonding strength.
3Strength
If firm glue is used for the final flap gluing, then the bonding strength is improved, but the risk of glue spreading increases
Solution Approach 1:
A glue distribution roller is introduced as an intermediary component between the second glue application device and the closing flap. This roller receives the firm glue from the application device and distributes it uniformly across the flap surface, preventing uncontrolled spreading while maintaining strong bonding. The intermediary roller resolves the contradiction between bonding strength and glue spreading control.
4Reliability
If differentiated glue application is implemented, then the gluing reliability is improved, but the device complexity increases
Solution Approach 1:
The second glue application device incorporates a glue distribution roller that serves multiple functions: it receives glue from the application device, distributes it uniformly across the closing flap, and prevents uncontrolled spreading. This multi-functional component reduces the overall system complexity while maintaining high gluing reliability through differentiated glue application.
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 enables optimal gluing of paper logs by ensuring the first sheet is lightly bonded to the core for initial winding and the final flap is firmly bonded for handling and storage, reducing the risk of glue spreading and improving the accuracy of glue distribution.
Implementation Method 1
un soporte elástico que se deforma de forma elástica, de tal manera que el pad se mueva de forma elástica hacia el portapad cuando se somete a una presión
Data Source
AI summary
Rewinding machine for producing paper logs by winding a paper web, include: an element for feeding a paper web along a predetermined path at a predetermined feeding speed; web pre-cutting elements; web winding elements; web sizing elements, with a pad adapted to cyclically apply glue by contact on the web, the pad being mounted on a pad-holder device connected with a corresponding actuator. The pad is mounted on the pad-holder device by an elastic support which deforms elastically, such that the pad moves elastically towards the pad-holder, when it is subjected to a pressure and moves automatically in the opposite direction returning to its previous position when the pad is no longer subjected to a pressure.