Center-Feed Coreless Roll Dispenser to Prevent Collapse and Clogging
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Solution Overview
Problem
Existing sheet product dispensers for coreless rolls often suffer from collapsing and clogging issues due to the lack of a central core, leading to deformation and jamming when dispensing sheet products, especially when multiple sheets are withdrawn simultaneously.
Innovation Solution
A sheet product dispenser with a dispensing piece that protrudes into the central cavity of the roll, featuring a cone-shaped guidance system and a centering element to prevent collapse and clogging, allowing sheets to be dispensed one at a time by circumventing a tapered end before exiting through a smaller dispensing opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coreless roll of sheet product is used for dispensing, then the roll can be unwound from the center towards the side, but the roll deforms and collapses on itself due to lack of central core support
Solution Approach 1:
A dispensing piece is introduced as an intermediary element that engages into the central cavity of the coreless roll. This dispensing piece includes a guidance structure with a tapered end that extends into the central cavity to provide internal support, preventing the roll from collapsing while allowing sheets to be dispensed one at a time through the guidance channel.
2Productivity
If the central cavity of the roll grows as sheets are dispensed, then more sheets can be unwound, but the sheet product fills in the central cavity and causes clogging and jamming
Solution Approach 1:
The dispensing piece acts as a mediator that maintains a defined channel through the growing central cavity. As the roll is unwound and the cavity expands, the guidance structure with its tapered end continues to provide structural support and guide the sheet product, preventing it from collapsing into the cavity and causing jams.
Solution Approach 2:
The dispensing piece includes a guidance structure that segments the central cavity into a defined passage. This segmentation creates a controlled path for the sheet product to follow, preventing random collapse and ensuring that sheets are dispensed one at a time through the dispensing opening.
3Productivity
If multiple sheets are withdrawn simultaneously through the dispensing opening, then dispensing speed increases, but the dispenser becomes jammed due to friction between sheets and collapsed cavity
Solution Approach 1:
The guidance structure with its tapered end segments the flow of sheet product, allowing only one sheet to pass through the dispensing opening at a time. This segmentation prevents multiple sheets from being withdrawn simultaneously, eliminating the friction and jamming that would occur with multiple sheets passing through the opening together.
Data Source
AI summary
A sheet product dispenser for dispensing a strip of a sheet product from a static center-feed coreless roll of sheet product is disclosed. The roll includes a central cavity. The dispenser includes a container for accommodating the roll, and a dispensing piece which protrudes toward an interior of the container from one end of the container and which includes a guidance between a receiving opening for receiving the strip of sheet product from the roll and a dispensing opening for dispensing the strip of sheet product outside of the dispenser. The dispensing piece is arranged to engage into the central cavity of the roll. The dispensers provide a dispensing opening so that withdrawal of a sheet product is facilitated by avoiding collapsing or clogging. Furthermore, the dispenser has a compact configuration that gains space during delivery and transportation.