Tissue Stack Compression Dynamics for Symmetric Log Formation
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Solution Overview
Problem
Existing methods for compressing elongate stacks of folded absorbent tissues into compact logs face challenges such as tissue damage and creasing due to high pressure, especially when compressing logs over 1.5 meters in length, and are inefficient for high-speed production lines, leading to issues with dispenser functionality and machine reliability.
Innovation Solution
A method and apparatus that compresses the tissue stack by moving it along a transport path while the first compression member moves towards the second from a first spacing to a second spacing, maintaining parallel transport surfaces and using conveyor belts to ensure symmetric compression, allowing for continuous processing and minimizing damage to the upper and lower tissues, with optional attachment strips and wrapping to maintain compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high pressure is applied to compress the tissue stack to high density, then the bulk reduction and compression efficiency improve, but the upper and lower tissues become damaged or creased
Solution Approach 1:
The compression members are made movable rather than static, allowing them to move toward each other to compress the stack and then retract to allow the stack to be advanced. This dynamic operation enables continuous compression without sustained high pressure on any single tissue layer, preventing damage while maintaining compression efficiency.
Solution Approach 2:
The stack is advanced a predetermined distance before compression begins, and the compression members are positioned in advance. This preliminary positioning ensures that the compression force is applied symmetrically and uniformly across the stack, preventing localized damage to upper and lower tissues while achieving high compression density.
2Object-affected harmful factors
If static plates are used for compression in a batch process, then tissue damage is reduced, but production efficiency and speed decrease
Solution Approach 1:
The compression members are designed to move dynamically - advancing toward each other for compression and then retracting to allow stack advancement. This dynamic motion enables continuous high-speed production while limiting the duration of high pressure application, thereby maintaining tissue integrity unlike static plate compression.
Solution Approach 2:
The compression process is integrated into a continuous operation where stacks are compressed and then advanced in sequence without interruption. The movable compression members enable this continuous cycle, maintaining high production speed while avoiding the tissue damage associated with both static compression and continuous inclined belt compression.
3Productivity
If inclined belts or rollers are used for continuous compression, then production efficiency improves, but the first and last tissues in the stack become damaged due to high pressure and inclined surfaces
Solution Approach 1:
The compression members are positioned asymmetrically relative to the stack - the first and second compression members are spaced apart to define a compression path, with the stack advanced between them. This asymmetric positioning ensures that pressure is applied uniformly across the stack rather than concentrating on the first and last tissues, preventing damage while maintaining continuous production.
Solution Approach 2:
The stack is advanced a predetermined distance along the compression path before compression begins, and the compression members are positioned in advance to meet at a predetermined spacing. This preliminary action ensures symmetric compression force distribution, preventing damage to terminal tissues while enabling continuous high-speed production.
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 approach enables efficient, symmetric compression of tissue stacks into highly compressed logs without damage, suitable for high-speed production, reducing the need for frequent refilling of dispensers and enhancing tissue integrity, while allowing for continuous production and increased throughput.
Implementation Method 1
respective first and second transport surfaces defining a compression path therebetween, the transport surfaces being operable to transport a stack along the compression path
Implementation Method 2
an actuator mechanism for moving the first compression member towards the second compression member from a first spacing to a second spacing to form the log
Data Source
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AI summary
A method and apparatus are disclosed for compressing an elongate stack of folded absorbent tissues to form a tissue log. A stack of folded absorbent tissues is transported along a compression path from an input end to an output end, the compression path being defined between first and second opposed transport surfaces provided on first and second compression members. The first compression member is moved towards the second compression member from a first spacing to a second spacing to compress the stack and form the log, wherein the compression path has a length greater than the stack length and during compression, the stack moves along the compression path with respect to the compression members. During this process, the stack will be compressed from a first height to a second height corresponding to the second spacing.