Web Material Dispenser with Rounded Lip to Reduce Sheet Tearing
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Solution Overview
Problem
Existing dispensers for paper towels and similar materials face challenges in providing reliable and easy handling, often resulting in tearing or tabbing of sheets, especially when wet, due to acute angles and sharp edges during dispensing.
Innovation Solution
The dispenser features a support arrangement with a front abutment surface and upper and lower guiding edges, optimized with specific angles and a smooth guiding surface to reduce the pull force required for dispensing, minimizing tearing and tabbing by using a rim to form a rounded lip shape and extending the guiding surface, which reduces contact with sharp edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispensers use simple support structures, then manufacturing is easier, but sheets tear or tab during dispensing
Solution Approach 1:
The leading edge portion is formed with a rounded lip shape instead of sharp edges, creating curved guiding surfaces that guide sheets smoothly through the dispensing opening. This curvature prevents sheets from catching on sharp edges, eliminating tearing and tabbing while maintaining structural simplicity.
Solution Approach 2:
The support arrangement features localized guiding edges with specific geometric properties (rounded lip shape at leading edge, inclined abutment surface) at critical locations where sheets contact the structure. These localized features provide precise sheet guidance and control without requiring complex structures throughout the entire dispenser.
2Reliability
If dispensers use acute angles and sharp edges for sheet guidance, then structure is simpler, but sheets tear especially when wet
Solution Approach 1:
The leading edge portion incorporates a rounded lip shape with curved surfaces instead of acute angles and sharp edges. This curvature allows wet sheets to flex and follow the rounded path without catching or tearing, while the manufacturing process (injection molding) can easily produce these curved features.
3Ease of operation
If dispensers require high pull force to dispense sheets, then sheets stay in place better, but user handling becomes difficult
Solution Approach 1:
The rounded lip shape and curved guiding surfaces reduce friction and resistance against the sheet material, allowing users to pull sheets easily with minimal force. The curvature distributes contact forces smoothly, preventing sheet deformation while maintaining stack stability through proper weight distribution on the abutment surface.
Solution Approach 2:
The support arrangement is designed to adapt dynamically to the sheet material properties and user pulling force. The inclined abutment surface and rounded edges allow the structure to flex and accommodate natural sheet variations, providing consistent easy dispensing regardless of sheet condition (dry or wet).
Data Source
AI summary
A dispenser for dispensing sheets of web material is provided. The dispenser includes a dispenser housing and storage compartment for receiving a stack of sheets of web material. The housing has a front side, a rear side, upper and lower end portions, and two vertical sides connecting the front and rear sides, the lower end portion forming a dispensing end portion of the dispenser. The storage compartment includes a support arrangement for supporting the stack of sheets of web material at the dispensing end portion of the dispenser. The support arrangement a dispensing opening is arranged in a portion between the front, rear and side portions and an abutment surface to which the stack of sheets of web material can abut.