Embossed Sheet Bonding Water-Soluble Layer to Cellulose Protuberances
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Solution Overview
Problem
Existing paper products with water-soluble and cellulose layers face complexity in production and lack clear connection methods, which affects their non-permeability and absorbency, particularly in preventing liquid and microbial transfer during use and disposal.
Innovation Solution
An embossed sheet with cellulose wadding and water-soluble material layers, where the water-soluble material is linked to cellulose wadding at the vertices of protuberances, using partial dissolution and bonding techniques to ensure effective connection and maintain sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the water-soluble material is linked to cellulose wadding by hot extrusion and hot bonding, then the connection between layers is achieved, but the production process becomes relatively complex
Solution Approach 1:
The connection process is segmented into two distinct steps: first embossing the cellulose wadding to create protuberances, then linking the water-soluble material to these protuberances. This segmentation simplifies the overall production process by breaking down the complex hot extrusion and hot bonding into more manageable operations that can be performed with simpler equipment.
Solution Approach 2:
The embossing of the cellulose wadding is performed in advance before the water-soluble material is applied. This preliminary action creates the protuberances that will serve as connection points, making the subsequent linking step simpler and more reliable without requiring complex simultaneous processing equipment.
2Reliability
If the water-soluble material forms a complete waterproof barrier, then non-permeability is improved, but the ability to disperse in water after use is reduced
Solution Approach 1:
The water-soluble material is linked to the cellulose wadding at discrete locations (vertices of protuberances) rather than forming a continuous bond across the entire surface. This local connection approach maintains the waterproof barrier function during use while preserving the ability of the material to disperse in water after use, as the connections are sufficient for structural integrity but not so extensive as to prevent dispersion.
3Quantity of substance
If the ply of water-soluble material is made thinner, then the absorbent properties of cellulose wadding are improved, but the strength of the water-soluble barrier is reduced
Solution Approach 1:
The water-soluble material is linked to the cellulose wadding at multiple discrete points (vertices of protuberances) rather than requiring a thick continuous layer. This segmentation allows the barrier function to be achieved through distributed connection points, enabling the use of thinner material that provides sufficient barrier strength while maximizing the absorbent capacity of the cellulose wadding.
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 enhances the product's absorbency and non-permeability, ensuring hygienic use and easy disposal by preventing liquid and microbial transfer, while simplifying the production process through controlled connection methods.
Implementation Method 1
the ply of water-soluble material is linked to said at least one ply of cellulose wadding by locally dissolving the ply of water-soluble material, at the level of said vertices of said at least part of the protuberances
Implementation Method 2
The fold of water-soluble material is made so as to form a waterproof barrier to liquids and to microorganisms such as bacteria and viruses contained in these liquids
Implementation Method 3
each of the different plies constituting the paper product is capable of dispersing in water, when the product is thrown into the toilet
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention proposes an embossed sheet (10) comprising at least one ply (12) of cellulose wadding having an embossing pattern comprising at least one series of protuberances (18) formed projecting from one surface of said ply (12) of cellulose wadding, and at least one ply joined to said at least one ply (12) of cellulose wadding and located opposite said surface of the ply (14) of water-soluble material, characterized in that the ply (14) of water-soluble material is joined to said at least one ply (12) of cellulose wadding at the summits (18a) of at least part of the protuberances (18). The invention also proposes a method for manufacturing such a multi-ply sheet (10).