Rewinder Pad Roller Elastic Support Gluing
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Solution Overview
Problem
Existing rewinding machines face challenges in achieving optimal gluing of the closing flap or final edge of paper logs, as the glue requirements differ significantly between the initial sheet bonding and the final flap gluing, leading to inefficiencies and potential spreading issues.
Innovation Solution
A rewinder and method that allow for the precise application of different types and viscosities of glue for bonding the paper web to the core at the start of winding and for gluing the final flap of the log, using a pad-holder roller with an elastic support to ensure controlled glue distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single glue application system is used for both initial sheet bonding and final flap gluing, then the device complexity is reduced, but the gluing quality and reliability deteriorate due to incompatible glue requirements
Solution Approach 1:
The patent divides the glue application system into two independent subsystems: a first glue application device for bonding the initial sheet to the core, and a second glue application device for gluing the final flap. Each subsystem can use different glue types and viscosities optimized for its specific function, resolving the contradiction between device simplicity and gluing quality.
Solution Approach 2:
The patent applies different glue characteristics to different locations in the process: a lighter glue with lower viscosity is used at the beginning for initial bonding, while a firmer glue with higher viscosity is used at the end for final flap gluing. This local differentiation of material properties ensures optimal performance at each stage without requiring a completely different overall system.
2Reliability
If a firm glue is used for final flap gluing to ensure durability, then the gluing reliability improves, but the risk of glue spreading and paper waste increases
Solution Approach 1:
The patent employs a movable applicator roller for the second glue application device that can be dynamically positioned and retracted. The roller is moved into contact with the web only when needed for flap gluing and withdrawn when not in use, providing precise control over glue application timing and location. This dynamic control prevents glue spreading while maintaining reliable flap bonding.
Solution Approach 2:
The patent introduces a movable applicator roller as an intermediary between the glue supply and the web. This intermediary component allows controlled transfer of firm glue to the web surface only at the precise moment and location needed for flap gluing, preventing premature or uncontrolled glue spreading while ensuring durable bonding when required.
3Reliability
If different glue types are used for initial bonding and final gluing, then the gluing quality improves, but the device complexity and operation difficulty increase
Solution Approach 1:
The patent designs both glue application devices with similar structural configurations and control mechanisms, allowing them to perform their respective functions with comparable operational procedures. Despite using different glue types, the devices share common design features that simplify operation and maintenance, reducing the complexity increase that would normally accompany differentiated glue application systems.
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 enables precise and controlled gluing operations, reducing the risk of glue spreading and allowing for the use of various glue types, which enhances the quality and handling of paper logs throughout processing and packaging.
Implementation Method 1
said pad being mounted on an elastic support which moves said pad towards said paper web when it is subjected to a pressure
Data Source
AI summary
A rewinding machine for producing paper logs by winding a paper web, comprising: elements 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 web sizing elements are arranged upstream of a web winding station. The pad-holder device is controlled such that, when the pad contacts the web, the pad is moved with a speed lower than the speed of the web along the respective feeding path so as to cause a prolonged contact of the pad with the web while the pad and the web move.