Perforated Web Dispenser Separation for Low-Pull Towel Tearing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispensers for web materials with perforation lines struggle with reliable separation of individual products, especially when the web material is wet or subjected to varying pull forces, and they often require strong web materials that are less suitable for hygienic products like paper towels. Additionally, they face challenges with accommodating different web material lengths and connection means, leading to issues with feeding and breakage.
Innovation Solution
A dispenser with a separation arrangement comprising a first unit providing a tensioning force and a second unit that stretches the web material in both length and width directions, ensuring reliable separation along perforation lines with a low pull force requirement, and is adaptable to various web materials and connection means through adjustable tensioning force and resilient units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strong web material is used to withstand the force necessary to bring a full heavy roll into rotation, then the roll can be handled, but the softness of the paper is low
Solution Approach 1:
The continuous web material is divided into individual products by perforation lines, allowing the web to be separated into manageable sections. This segmentation enables the use of softer paper while maintaining structural integrity during dispensing operations.
Solution Approach 2:
The web material is pre-folded into an accordion-like configuration with pre-formed perforation lines. This preliminary folding and perforating allows the soft paper to be properly positioned and separated before use, eliminating the need for high strength to withstand rolling forces.
2Quantity of substance
If a heavy paper roll is used to store web material, then a large amount of material can be stored, but the dispenser demands a large amount of space
Solution Approach 1:
The web material is folded into an accordion-like nested structure where multiple layers are compactly arranged within the housing. This nesting allows a large quantity of web material to be stored in a compact volume, significantly reducing the dispenser size compared to traditional roll dispensers.
Solution Approach 2:
The web material is folded in a curved accordion pattern rather than a linear arrangement. This curved folding maximizes the storage capacity within the available housing volume, allowing more material to be packed into a smaller space.
3Volume of stationary object
If the web material is folded in an accordion-like configuration, then the storage volume is reduced, but reliable separation at perforation lines becomes difficult
Solution Approach 1:
The separation arrangement applies localized forces at specific points along the web material. The first unit applies tensioning force at one location while the second unit stretches the web at a different location, creating localized stress concentrations that reliably initiate separation at the perforation lines without affecting the entire web structure.
Solution Approach 2:
The separation arrangement uses dynamic, movable units that can adapt to the folded web configuration. The first and second units work together to dynamically apply forces that follow the web material through the folding pattern, ensuring reliable separation regardless of the accordion fold orientation or web tension.
4Reliability
If the first unit applies a tensioning force and the second unit stretches the web material, then separation at perforation lines is improved, but the device complexity increases
Solution Approach 1:
The first and second units are combined into a single integrated separation arrangement that works together to achieve separation. By merging the tensioning and stretching functions into one coordinated system, the patent reduces overall complexity compared to having separate, independent mechanisms for each function.
Solution Approach 2:
The separation arrangement is designed to be universally applicable to different web material types and folding configurations. The first and second units can adapt their operation to various perforation patterns and web properties, reducing the need for multiple specialized mechanisms and thereby simplifying the overall device.
Data Source
AI summary
A dispenser for dispensing at least one perforated web from a storage of web material, the dispenser including: a housing arranged to hold a storage of perforated web material, wherein a web path extends along a feeding direction in an interior of the housing from a storage position to a dispensing opening of the dispenser, and a separation arrangement being arranged along said web path, for separating the at least one perforated web along the perforations thereof, said separation arrangement including a first unit and a second unit, the second unit being arranged downstream said first unit, as seen in the feeding direction of the web path. The first unit is arranged to provide a tensioning force on said web, and the second unit being arranged to stretch the web material along the length of the web and along the width of the web.