Separation unit and a dispenser comprising a separation unit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional separation units for web materials with preformed lines of weakness face challenges in reliably separating different types of web materials with varying lengths between weakening lines without damaging the material, especially when dealing with soft or weak web materials.
Innovation Solution
A separation unit comprising a first and second shaft with protrusion elements arranged in a staggered relationship, forming an undulating passage, and a contact element that provides frictional assistance to rupture the web material along the weakening lines, ensuring complete separation without cutting or piercing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional separation unit is used to separate web material along preformed lines of weakness, then the web material can be separated, but soft or weak web materials may be damaged during the separation process
Solution Approach 1:
The separation unit is divided into multiple shafts (at least two shafts) with protrusion elements arranged in staggered relationships. This segmentation allows the web material to be separated through multiple localized action points rather than a single aggressive point, reducing damage to soft or weak materials while maintaining separation reliability
Solution Approach 2:
Protrusion elements extending from the shafts act as intermediaries between the separation unit and the web material. These protrusion elements gently engage the web material at staggered positions, providing a mediating mechanism that enables separation along preformed lines of weakness without directly damaging the web material structure
2Adaptability or versatility
If the separation unit uses a simple nip structure, then the device complexity is low, but it cannot reliably separate different types of web materials with varying lengths between weakening lines
Solution Approach 1:
The separation unit with multiple shafts and protrusion elements configured in staggered relationships serves multiple functions: it can separate different types of web materials (paper towels, tissue paper, nonwoven material), accommodate varying lengths between weakening lines, and work with both rolled and folded web material configurations. This multi-functionality achieves high adaptability without excessive complexity
Solution Approach 2:
The protrusion elements are arranged in staggered relationships that create dynamic separation action as the web material passes through the nip. The staggered arrangement allows the protrusion elements to sequentially engage and separate the web material at different positions, providing adaptive separation for varying web material configurations and lengths
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
The solution enhances the reliability of web material separation by providing a gentle yet effective mechanism that can handle different types of web materials, ensuring consistent separation along preformed lines of weakness without damaging the web material, even when the web is soft or weak.
Implementation Method 1
a contact element, which, together with at least one of the protrusion elements, is arranged to provide frictional assistance to rupture the web material along the weakening lines
Data Source
AI summary
A separation unit is provided for separating a web material having a web width along preformed lines of weakness. The separation unit includes at least a first shaft extending along a first longitudinal axis and at least a second shaft extending along a second longitudinal axis in parallel with the first shaft. The separation unit also includes at least one first protrusion element extending perpendicularly from the first shaft and being arranged to be rotatable about the first longitudinal axis, and at least one second protrusion element extending perpendicularly from the second shaft and being arranged to be rotatable about the second longitudinal axis. The separation unit further includes at least one contact element being arranged in biased abutment against at least one of the first and second protrusion elements in a direction perpendicular to the first or second longitudinal axis.