Separation unit and a dispenser comprising a separation unit
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Solution Overview
Problem
Existing dispensers for paper towels face challenges in separating web materials along perforation lines without breaking them, especially when dealing with different types and lengths of web materials, and require significant energy to manage heavy rolls, which affects softness and space usage.
Innovation Solution
A separation unit with two rollers positioned perpendicularly to each other, featuring protrusion elements with a staggered arrangement and radial overlap, forming an undulating passage that optimizes the pinch force to accurately and smoothly separate web materials along preformed lines of weakness, minimizing the force needed for separation while preventing web material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a heavy roll of paper towels is used to store web material, then a large amount of web material can be stored, but the weight increases and requires strong paper that reduces softness
Solution Approach 1:
The continuous web material is divided into multiple bundles connected by connecting means. Each bundle can be independently handled and dispensed, reducing the weight that needs to be rotated and managed as a single heavy roll while still storing a large total quantity of web material.
Solution Approach 2:
Instead of storing web material in a horizontal roll configuration that requires rotation, the invention uses vertically stacked bundles connected by connecting means. The dispensing mechanism moves vertically through the bundles rather than rotating a heavy roll, eliminating the weight-related rotational inertia problems.
2Quantity of substance
If a heavy roll of paper towels is used, then a large amount of web material can be stored, but the space required increases
Solution Approach 1:
The web material is segmented into multiple compact bundles stacked vertically rather than forming a large horizontal roll. This segmentation allows more efficient space utilization in the dispensing unit while maintaining the ability to store a large total quantity of web material.
Solution Approach 2:
The invention transitions from horizontal roll storage to vertical bundle stacking. This dimensional change optimizes the use of vertical space within the dispensing unit, reducing the horizontal footprint and overall volume required while storing the same or greater amount of web material.
3Productivity
If protrusion elements on rollers are arranged to apply strong pinch force for separation, then web material can be separated along perforation lines, but the web material may break prematurely
Solution Approach 1:
The protrusion elements are designed with varying properties along their length, with the outer portions having different characteristics than the inner portions. This local differentiation allows the outer portions to interact with the web material in a controlled manner that prevents premature breaking while still enabling effective separation at the perforation lines.
Solution Approach 2:
The protrusion elements on the first and second rollers are arranged asymmetrically with staggered outer portions. This asymmetric arrangement creates a controlled undulating passage that distributes the separation force evenly along the perforation line, preventing concentrated stress that could cause premature web material breakage.
4Manufacturing precision
If the outer portions of protrusion elements are arranged in staggered relationship with radial overlap, then accurate separation along perforation lines is achieved, but the device complexity increases
Solution Approach 1:
The invention optimizes specific parameters of the protrusion elements, such as the radial overlap length (2-40 mm) and the sum of maximum widths within the overlap length (5-30% of roller web width). By carefully controlling these parameters, high separation accuracy is achieved while keeping the overall device design relatively simple and manufacturable.
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 enables accurate and efficient separation of web materials, reducing the risk of premature line breakage and minimizing the force required, making it adaptable for various types and lengths of web materials, and eliminating the need for electrical power, thus providing a flexible and space-efficient solution.
Implementation Method 1
The protrusion elements may be made of rubber or another elastomeric material. The protrusion elements may be covered by a sleeve or ring of an elastomeric material encircling the outer periphery of each individual protrusion element.
Data Source
AI summary
A separation unit for separating a web material along preformed lines of weakness. The separation unit has a width direction and includes a first roller having a rotational axis extending in the width direction and a web width extending in the width direction, and a second roller having a rotational axis extending parallel with the rotational axis of the first roller and a web width extending in the width direction. The second roller is positioned at a distance from the first roller. Each of the first and the second rollers is provided with a plurality of protrusion elements being spaced along the rotational axes and protruding perpendicular from the axes. Each of the protrusion elements has a maximum width in the width direction, a maximum radial extension from the rotational axes, an inner portion adjacent to the rotational axes, and an outer portion remote from the rotational axes.