Tissue Stack Temporary Compression Packaging
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Solution Overview
Problem
Existing methods for forming packages of absorbent tissue paper material face challenges in reducing bulk while maintaining quality, as high compression pressures can alter tissue properties, increase springback force, and make packaging difficult to apply efficiently in mass production.
Innovation Solution
A method involving temporary compression of the tissue paper stack to a height between 30% and 95% of its original height before packaging, which reduces springback force and allows for more efficient packaging with conventional materials, maintaining high density and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high compression pressures are applied to the tissue paper stack, then the bulk of the package is reduced, but the absorbency and quality of the tissue paper material deteriorates
Solution Approach 1:
The stack is compressed to a first height H1 (temporary compression) before the packaging is applied. This preliminary compression reduces the bulk while the packaging is then applied to maintain this compressed state. The packaging prevents the stack from expanding back to its original height, thereby maintaining reduced bulk without requiring excessive compression pressure that would damage tissue quality.
Solution Approach 2:
The method changes the height parameter of the stack from its original height H to a first height H1 (where H1 < H) through compression. The packaging is then designed to maintain this new height parameter, effectively changing the volume state of the stack while preserving tissue quality through controlled compression rather than excessive pressure.
2Volume of moving object
If high compression pressures are applied to the tissue paper stack, then the bulk is reduced, but the springback force increases making packaging difficult to apply
Solution Approach 1:
The stack is compressed to the first height H1 as a preliminary step before packaging application. By performing this compression in advance and maintaining it through the packaging, the springback force is reduced during the packaging application process, making the manufacturing process easier and more efficient.
Solution Approach 2:
The method dynamically adjusts the compression state of the stack. The stack is compressed to H1, and the packaging is designed to maintain this dynamic state. This prevents the stack from constantly trying to expand, thereby reducing springback force and facilitating easier packaging application and manufacturing.
3Productivity
If the stack is highly compressed, then more tissue paper material can be transported per pallet, but the plies become attached making withdrawal difficult
Solution Approach 1:
The height parameter of the stack is changed from H to H1 through controlled compression, achieving higher density (up to 0.95 kg/dm³) for improved transport efficiency. The packaging is designed to maintain this compressed state while allowing the plies to remain separable, preventing permanent attachment and enabling easy withdrawal when needed.
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 method effectively reduces bulk and springback force, enabling more efficient packaging and storage, while maintaining the absorbency and ease of use of the tissue paper, and allowing for denser packing without compromising tissue quality.
Implementation Method 1
compressing each portion of the stack in a direction along the height (H) to assume a temporary height H1 being c1×H0
Implementation Method 2
the compressed stacks will strive to reexpand. Accordingly, the outermost panel surfaces of the stacks will exert a force, which may be referred to as a springback force, on the packaging
Data Source
AI summary
A method for forming a package including a stack of absorbent tissue paper material and a packaging, the tissue paper material in the stack forming panels having a length, and a width perpendicular to the length, the panels being piled on top of each other to form a height extending between a first end surface and a second end surface of the stack, and the packaging encircling the stack so as to maintain the stack in a compressed condition in the package, with a selected packing density D0 of the stack, and a selected packing height H0; the method including: forming the stack of absorbent tissue paper material; compressing each portion of the stack in a direction along the height to assume a temporary height H1 being c1×H0, where c1 is between 0.30 and 0.95; and applying the packaging to the stack.