Method and apparatus for forming a package comprising a stack of absorbent tissue paper material and a packaging
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Solution Overview
Problem
Existing methods for packaging absorbent tissue paper materials face challenges in reducing bulk while maintaining quality, as high compression leads to reduced absorbency and increased springback force, making it difficult to apply packaging effectively in mass production.
Innovation Solution
A method involving temporary compression of the tissue paper stack to a height less than its packing height, followed by packaging, which reduces the springback force and allows for higher packing density without damaging the material, using a compressing unit and packaging unit to maintain the stack at the desired density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high compression pressure is applied to the tissue paper stack to reduce bulk, then packing density is improved, but absorbency is reduced
Solution Approach 1:
The tissue paper stack is pre-compressed to a temporary height H1 (where H1 < H0) before packaging is applied. This preliminary compression reduces the bulk to fit within the packaging while the packaging is then applied to maintain the compressed state, allowing high packing density without excessive compression that would damage absorbency
2Quantity of substance
If high compression pressure is applied to the tissue paper stack to reduce bulk, then packing density is improved, but springback force increases
Solution Approach 1:
The stack is pre-compressed to a temporary height H1 before packaging application. This preliminary action allows the packaging to be applied while the stack is in a controlled compressed state, reducing the springback force that would otherwise occur when trying to package a highly compressed stack
Solution Approach 2:
The packaging acts as an intermediary that maintains the compressed state of the stack. By applying the packaging at the temporary compressed height H1, the packaging serves as a mediator that holds the stack in this state, preventing excessive springback while maintaining high packing density
3Volume of moving object
If high compression is applied to the tissue paper stack, then bulk is reduced, but manufacturing complexity increases
Solution Approach 1:
The stack is pre-compressed to a temporary height H1 before packaging application. This preliminary compression step simplifies the overall manufacturing process by reducing the bulk early, making it easier to handle and package, while the packaging then maintains this reduced bulk state
Solution Approach 2:
The compression process is segmented into two distinct stages: first compressing to temporary height H1, then applying packaging to maintain the compressed state at packing height H0. This segmentation allows each step to be optimized independently, reducing overall manufacturing complexity
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 achieves a higher packing density with reduced springback force, enabling more efficient packaging and storage, while maintaining the tissue paper's quality and ease of use, allowing for denser packing and reduced expansion after unpacking.
Implementation Method 1
each portion of the stack is compressed in a direction along the height (H) to assume a temporary height (H1) being c1 x H0
Implementation Method 2
the springback force exerted by a compressed stack towards a packaging may be referred to
Data Source
Figure 1
Figure 2a~3c
Figure 4a~5b
AI summary
The present disclosure relates to a method for forming a package (100) comprising a stack (10) of absorbent tissue paper material and a packaging (20), the tissue paper material in said stack forming panels having a length (L), and a width (W) perpendicular to said length (L), said panels being piled on top of each other to form a height (H) 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 said package, with a selected packing density D0 of said stack (10), and a selected packing height H0; wherein said absorbent tissue paper material is a dry crepe material, and said selected packing density D0 is between 0.30 and 0.95 kg/dm3, or alternatively, said absorbent tissue paper material is a structured tissue material, and said selected packing density D0 is between 0.20 and 0.75 kg/dm3, or alternatively said absorbent tissue paper material is a combination material, comprising at least a dry crepe material and at least a structured tissue material, and the selected packing density D0 is between 0.25 and 0.80 kg/dm3; the method comprising: forming (200) said stack (10) of absorbent tissue paper material; compressing (210) each portion of said stack (10) in a direction along said height (H) to assume a temporary height H1 being c1 x H0, where c1 is between 0.30 and 0.95; and applying (220) said packaging (20) to the stack (10). The disclosure also relates to an apparatus for performing the method.