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, particularly with heavy rolls that require high energy and space, and in accommodating different web materials and lengths between perforations, leading to issues with web breakage and inefficient dispensing mechanisms.
Innovation Solution
A dispenser with a separation unit featuring rollers with protrusion elements arranged in a staggered relationship, forming an undulating passage that applies a controlled pinch force to break preformed lines of weakness, allowing for accurate and smooth separation of web materials, with adjustable distance and protrusion element geometry to accommodate various web types and lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If heavy rolls of paper towels are used to store web material, then a large amount of web material can be stored, but the weight increases and requires high energy for acceleration and unrolling
Solution Approach 1:
The continuous web material is divided into multiple bundles connected by connecting means. Each bundle can be independently handled and fed into the dispenser, replacing the need for a single heavy continuous roll while maintaining the ability to store large amounts of material.
Solution Approach 2:
The dispenser is designed to dynamically feed and separate individual bundles as needed, rather than continuously unrolling a heavy roll. The feeding mechanism adapts to feed bundles sequentially, reducing the moment of inertia and energy required for acceleration.
2Quantity of substance
If heavy rolls of paper towels are used, then a large amount of web material can be stored, but the dispenser requires large space due to the volume of heavy rolls
Solution Approach 1:
By segmenting the web material into compact bundles with connecting means, the dispenser can store equivalent amounts of material in a more space-efficient configuration compared to a single large-diameter roll, optimizing the use of internal housing volume.
3Force
If strong paper is used to withstand the force necessary to rotate heavy rolls, then the roll can be accelerated, but the softness of the paper decreases
Solution Approach 1:
The feeding mechanism is designed to apply force progressively to accelerate lighter bundles rather than requiring high force to accelerate a heavy roll. This dynamic feeding approach reduces the peak forces needed, allowing the use of softer paper that is gentler on the skin.
4Manufacturing precision
If a separation unit with protrusion elements is used to separate web material along perforation lines, then accurate separation is achieved, but the device complexity increases
Solution Approach 1:
The protrusion elements are strategically positioned only at specific locations corresponding to perforation lines, rather than uniformly across the entire roller surface. This localized approach provides precise separation functionality only where needed, reducing overall device complexity while maintaining separation accuracy.
5Adaptability or versatility
If the separation unit accommodates different types of web materials and lengths between perforations, then versatility is improved, but the device complexity increases
Solution Approach 1:
The separation unit with adjustable protrusion elements is designed to handle multiple types of web materials and varying perforation patterns using a single configuration system. The protrusion elements can be positioned to accommodate different material thicknesses and perforation spacings, providing universal functionality without requiring multiple specialized components.
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 precise and efficient separation of web materials, minimizing the force required for separation while preventing web breakage, and is adaptable for different types and lengths of web materials, optimizing the pinch force for effective dispensing without electrical power.
Implementation Method 1
The separation unit is suitable to separate the web material along preformed lines of weakness by passage through the undulating passage of the separation unit
Implementation Method 2
there is a friction and resistance for unrolling the paper
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3
AI summary
The present invention provides a separation unit for separating a web material along preformed lines of weakness. The separation unit has a width direction and comprises at least a first roller having a rotational axis extending in the width direction and a web width extending in the width direction, and at least 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, the distance extending in a direction perpendicular to the width direction. Each of the first and the second rollers is provided with at least one protrusion element extending perpendicularly 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. The outer portions of the protrusion elements on the first roller are arranged in a staggered relationship with the outer portions of the protrusion elements on the second roller such that the outer portions of the protrusion elements on the first roller are partially overlapping with the outer portions of the protrusion elements on the second roller with a radial overlap length, thus forming an undulating passage for a web material between the rollers. The radial overlap length is between 2-40 mm, preferably 2-20 mm, more preferably 3-12 mm, or most preferably between 4-10 mm.