Mechanical Ply-Bonding for Web Material Log Tail Ends
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for closing the tail end of web material logs, such as tissue paper, rely on glue, which leads to maintenance issues, waste due to seepage, and damage to the logs, while alternative methods like mechanical ply-bonding are ineffective in ensuring reliable fastening without damaging the material.
Innovation Solution
A method and device that uses mechanical ply-bonding to secure the tail end of a log to a portion of the outermost turn, employing high-pressure compression to join the layers without glue, using a fold in the web material to facilitate this process and prevent unwanted bonding of turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glue is used to close the tail end of the log, then the tail end is securely fastened to the log, but the glue soils the machines, requires frequent maintenance and cleaning, and causes seepage toward inner turns breaking and wasting turns
Solution Approach 1:
The invention extracts and eliminates the glue application system from the log closing process. Instead of applying glue to the tail end, the patent uses a mechanical pressing system that physically compresses the tail end against the log surface, removing the harmful glue substance entirely while maintaining secure fastening
Solution Approach 2:
The invention replaces the chemical bonding mechanism (glue) with a mechanical bonding mechanism (pressing and compression). The pressing device applies direct mechanical force to bond the tail end to the log through friction and compression, substituting chemical adhesion with physical mechanical attachment
2Object-generated harmful factors
If mechanical ply-bonding is used to fasten the tail end, then glue is eliminated, but the method is ineffective in ensuring reliable fastening without damaging the material
Solution Approach 1:
The invention applies localized pressing force specifically at the tail end region where bonding is needed, rather than applying uniform force throughout the entire log. The pressing device concentrates mechanical action on the specific area requiring attachment, ensuring reliable fastening without damaging other portions of the material
Solution Approach 2:
The pressing action is applied at the optimal moment when the tail end is positioned against the log surface, creating immediate mechanical bonding before the log continues its movement. This timely application of mechanical force ensures secure attachment without requiring excessive force that could damage the material
3Reliability
If high pressure is applied to emboss the tail end, then ply-bonding is achieved, but the logs undergo deformation and collapse of the central supporting core
Solution Approach 1:
The pressing device applies force locally at the tail end region rather than uniformly across the entire log surface. This localized mechanical action achieves ply-bonding only where needed at the tail end, preventing deformation and collapse of the central supporting core and maintaining the log's overall cylindrical shape
Solution Approach 2:
The invention applies just enough pressing force to achieve reliable ply-bonding at the tail end without exceeding the threshold that would cause log deformation. The mechanical action is calibrated to be sufficient for bonding purposes but not excessive to the point of damaging the log structure
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 reliably fastens the tail end without damaging the log, reduces waste, and allows the final user to easily open the roll, eliminating the drawbacks of glue-based systems while maintaining the cylindrical shape of the log.
Implementation Method 1
a device to close the tail end of a log of wound web material, typically a log of tissue paper, comprising a mechanical ply-bonding member arranged and controlled to mechanically join the tail end to a portion of the web material of the log
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
To close the tail end (L) of the web material forming the log (R) there is provided mechanical ply-bonding between the tail end and a portion of the last turn of web material, preferably a portion forming a fold (F) projecting from the log.