Interfolded Sheet Stack Adhesion for Reliable Dispenser Transfer
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Solution Overview
Problem
Existing interfolded sheet stacks experience dispensing failures when transitioning from one stack to another in a dispenser, as only one sheet may be pulled through, leading to incomplete dispensing of hygiene products.
Innovation Solution
Applying an adhesive layer on both the first and second sheets at the start of the stack to adhere to the end of the preceding stack, ensuring both sheets are pulled through the dispensing opening together, using hook and loop fastening materials or adhesive tapes to secure the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one sheet has an adherence layer at the start of the stack, then the structure is simpler and easier to manufacture, but dispensing reliability deteriorates because the other sheet may fall away during dispensing
Solution Approach 1:
The adherence layer is segmented and applied separately to each sheet (first sheet and second sheet) at the start of the stack, rather than using a single unified adherence structure. This segmentation ensures that each sheet independently adheres to the preceding stack, preventing dispensing failures while maintaining manageable complexity in the application process.
2Strength
If the adherence layer is applied only at the end of the preceding stack, then the application process is simpler, but the connection strength between stacks deteriorates when dispensed against gravity
Solution Approach 1:
The adherence layer is applied in advance to both the end of the preceding stack and the start of the current stack during the manufacturing process. This preliminary action ensures that when the stacks are later dispensed against gravity, the connection is already established and maintained, providing strong connection strength while keeping the manufacturing process straightforward.
3Reliability
If marginal or non-existent offset is used between lines of perforation of first and second sheets, then the interfolding is tighter, but dispensing reliability deteriorates because both sheets may be grasped simultaneously causing failure
Solution Approach 1:
A deliberate asymmetric offset is introduced between the lines of perforation of the first sheet and the second sheet. This asymmetric positioning ensures that during dispensing, only one sheet is grasped at a time, preventing simultaneous grasping failures. The offset is designed to be sufficient to differentiate grasping points while maintaining a compact interfolding structure.
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 solution prevents dispensing failures by ensuring both sheets are securely pulled through the dispensing opening, maintaining product continuity and reducing the risk of sheets falling away, even when dispensed against gravity.
Implementation Method 1
Applying an adhesive layer on both the first and second sheets at the start of the stack to adhere to the end of the preceding stack
Implementation Method 2
using hook and loop fastening materials or adhesive tapes to secure the connection
Data Source
Figure 1~2
Figure 3~5
AI summary
A stack (1) of hygiene sheet products comprising first and second webs (2, 3) that are interfolded with each other. The stack includes a top panel (11) of the first web (2) and a top panel (12) of the second web (13), wherein the top panel of the first web overlays the top panel of the second web but has been cut away so that the top panel of the second web is revealed by the top panel of the first web. An adherence layer (14) is placed on the top panel of the first web and the top panel of the second web and is exposed at the top of the stack so that it can adhere to an adjacent stack so that when the last sheets of the adjacent stack are pulled through a dispenser opening of a dispenser, the first and second sheets are pulled securely through with it as a result of the direct adherence.