Interfolder Lap Roll Speed Differential Overlap
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Solution Overview
Problem
Conventional interfolding apparatuses require a separate slowdown or transfer roll to achieve multi-fold stacks, increasing complexity, size, and cost due to the need for an additional intermediate station for sheet overlap.
Innovation Solution
The apparatus includes a knife roll for cutting sheets and a folding roll with a lap roll that directly transfers sheets, where the folding roll operates at a slower speed than the lap roll to create a 1/3 overlap without the need for a separate slowdown roll, simplifying the design and eliminating the intermediate station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate slowdown roll is added to achieve multi-fold stacks, then the sheet overlap function is improved, but the device complexity increases
Solution Approach 1:
The patent combines the slowdown function and sheet transfer function into a single folding roll that performs both operations. The folding roll simultaneously slows down the web material and transfers it to create the desired overlap, eliminating the need for a separate slowdown roll and intermediate station.
Solution Approach 2:
The folding roll is designed to perform multiple functions: it acts as both a slowdown roll and a transfer roll. By rotating at a controlled speed different from the lap roll, it achieves both speed reduction and sheet transfer in one component, simplifying the overall apparatus.
2Manufacturing precision
If an intermediate station is added for sheet transfer, then the multi-fold stacking is achieved, but the overall size increases
Solution Approach 1:
The patent merges the intermediate station functionality directly into the folding roll assembly. The folding roll, positioned adjacent to the lap roll, performs both the speed reduction and sheet transfer operations that previously required a separate intermediate station, thereby reducing the apparatus footprint.
3Manufacturing precision
If a separate slowdown roll is used, then the sheet overlap is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions into the folding roll, reducing the total number of components that need to be manufactured and assembled. This integration lowers manufacturing costs by eliminating redundant parts while maintaining the sheet overlap functionality.
4Ease of operation
If an additional transfer roll is added, then the sheet transfer is improved, but the device simplicity is reduced
Solution Approach 1:
The folding roll is designed as a multi-functional component that simultaneously performs slowdown and transfer operations. This universal component approach maintains ease of operation while reducing structural complexity by eliminating the need for separate transfer rolls and intermediate stations.
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 configuration results in a more compact, cost-effective, and simpler interfolding apparatus capable of forming multi-fold stacks efficiently, reducing the overall size and complexity while maintaining high-speed operation.
Implementation Method 1
The successive sheets are frictionally engaged by the folding roll and the additional roll and pass through the nip therebetween. The first roll speed of the folding roll is different from the second roll speed of the additional roll, the difference in speed between the folding roll and the additional roll operable to overlap adjacent portions of the successive sheets onto the folding roll.
Data Source
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AI summary
An interfolding apparatus comprising: a knife roll (54) rotatable about an axis and operable to cut sheets from a stream of web material issuing from a source in a downstream direction; a folding roll (138) positioned downstream of the knife roll (54) and adapted to receive the sheets, the folding roll (138) rotatable in a first direction; and a lap roll (106) adjacent the folding roll (138) rotatable about an axis in a second direction, the lap and folding roll defining a nip therebetween; wherein the sheets are directly transferred from the lap roll (106) to the folding roll (138) to overlap adjacent portions of successive sheets onto the folding roll.