Method for producing toilet paper roll
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Solution Overview
Problem
The 4-ply toilet paper rolls manufactured by laminating multiple sheets of paper often experience peeling issues when torn, leading to a compromised appearance due to loose, unattached sheets.
Innovation Solution
A manufacturing method involving the lamination of 1-ply base papers, where bonding liquid is applied between alternating sheets to form laminated papers, which are then stacked and pressed to create a stable 4-ply toilet paper roll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple sheets of base paper are laminated to form a 4-ply toilet paper roll, then absorbency is increased, but the laminated sheets become prone to peeling when torn
Solution Approach 1:
A bonding liquid is introduced as an intermediary substance between the base papers during lamination. The bonding liquid is applied to the surface of alternating base papers before stacking, creating a chemical adhesive bond that prevents peeling when the toilet paper is torn, while still allowing the multiple sheets to be separated for absorption function
Solution Approach 2:
The physical-chemical parameters of the base paper surfaces are modified by applying bonding liquid. The bonding liquid changes the surface properties of the paper at the lamination interfaces, creating regions with different adhesion characteristics that prevent delamination during use
2Stability of the object's composition
If bonding liquid is applied between all sheets, then adhesion is improved, but manufacturing complexity increases
Solution Approach 1:
The lamination process is segmented into alternating layers: base paper, bonding liquid, base paper, base paper, bonding liquid, base paper. This segmentation pattern reduces the number of bonding liquid applications compared to coating every interface, simplifying the manufacturing process while maintaining adequate adhesion
Solution Approach 2:
Bonding liquid is applied partially rather than to all interfaces. By applying bonding liquid only to alternating base papers rather than every sheet, the manufacturing process is simplified while still achieving sufficient adhesion strength to prevent peeling during use
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
This method ensures that individual layered sheets of the 4-ply toilet paper roll remain intact when torn, maintaining a good appearance and preventing peeling issues.
Implementation Method 1
a bonding liquid is applied between alternating sheets to form laminated papers
Data Source
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AI summary
A toilet paper roll manufacturing method is provided with which, when 4-ply toilet paper is torn off, individual layered sheets of the paper are prevented from peeling off each other and a good appearance is ensured. The method includes a step of forming laminated paper 101 by bonding base paper 10a and base paper 11a, a step of forming laminated paper 102 by bonding base paper 13a and base paper 12a, and a step of spraying a bonding liquid to the laminated paper 101 and the laminated paper 102, stacking and pressing the laminated paper 101 and the laminated paper 102 by pressure rollers 23c, and forming 4-ply toilet paper 200.