Coreless Tissue Roll Structure Without Adhesive Waste
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Solution Overview
Problem
Existing coreless tissue products face issues such as the need for adhesives that render the trailing end unusable and non-circular or small openings that hinder dispensing, leading to waste and usability problems.
Innovation Solution
A coreless tissue product is developed with a spirally wound tissue sheet forming a hollow passageway without a core or adhesive, using hydrogen bonding to maintain the structure and preserve the tissue's properties, allowing for a circular opening that facilitates easy dispensing and complete consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is applied to tissue sheets around the opening to prevent deformation, then the roll structure is stabilized, but the trailing end of the tissue roll becomes unusable and must be discarded
Solution Approach 1:
The invention extracts and eliminates the adhesive component from the coreless tissue roll structure. Instead of using adhesive to bond tissue sheets at the opening, the patent uses a combination of spiral winding geometry and hydrogen bonding between tissue layers to maintain structural stability without requiring adhesive application that would render the trailing end unusable.
Solution Approach 2:
The invention changes the bonding mechanism from chemical adhesive bonding to physical hydrogen bonding between tissue sheets. This parameter change allows the trailing end to remain usable since hydrogen bonding occurs naturally between layers during the winding process and does not require adhesive application at the trailing end that would prevent further use.
2Stability of the object's composition
If a core is used to form the tissue roll, then the roll structure is maintained and dispensing is enabled, but the core increases product cost and creates waste when discarded
Solution Approach 1:
The invention extracts and removes the separate core component from the tissue roll structure. By eliminating the core, the patent reduces material usage and waste while maintaining roll structure through alternative mechanisms including spiral winding geometry and inter-layer hydrogen bonding between tissue sheets.
Solution Approach 2:
The tissue sheets themselves serve the structural function previously provided by a separate core. The spiral winding configuration and hydrogen bonding between layers enable the tissue material to maintain its own roll structure without requiring an external core, allowing complete consumption of the product without leaving a discarded core.
3Loss of substance
If the opening in the coreless roll is made very small or non-circular, then adhesive usage is reduced, but the product requires special adaptors for dispensing and rotation is hindered
Solution Approach 1:
The invention changes the opening geometry to be substantially circular with a radius varying by no more than about 25%. This circular configuration enables easy rotation on standard spindles and straightforward dispensing without requiring special adaptors, while still maintaining coreless structure through hydrogen bonding rather than adhesive at the opening.
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 eliminates waste, maintains the tissue's physical properties, and enables easy dispensing without adhesives, making the entire roll usable and environmentally friendly.
Implementation Method 1
using hydrogen bonding to maintain the structure and preserve the tissue's properties
Data Source
AI summary
Coreless tissue rolls can be produced without having to use an adhesive to form a hollow center. Instead, moisture can be used to promote light hydrogen bonding between the layers of the tissue web that line the hollow center. The hydrogen bonding provides sufficient structure to maintain the shape of the hollow center without rendering the tissue web surrounding the passageway unusable. Passageways can also be formed in accordance with the present disclosure that are substantially circular so that the rolls will easily spin on a spindle. In an alternative embodiment, moisture is not used in constructing the wound tissue roll.