Sanitary Item Manufacturing Machine with S-Path Web Guide
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Solution Overview
Problem
Conventional machines for manufacturing personal sanitary items are large in size and produce a significant number of defective items due to the handling challenges of incoherent absorbent fibre pads, which scatter and require precise alignment, leading to misplacement and increased waste.
Innovation Solution
A machine with a compact design that uses a stable absorbent material band, cut into pads using a formation wheel and transfer mechanism, applied to a web guided by rollers with a convoluted 'S' path, reducing space requirements and improving precision through vacuum-assisted handling and bonding with a nonwoven topsheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pads are fashioned from incoherent cellulose fibres using grinding components, then absorbent pads can be produced, but the machine dimensions become decidedly large and the fibres scatter causing handling difficulties
Solution Approach 1:
The patent applies preliminary action by pre-forming the absorbent material into a stable continuous band before it reaches the pad formation station. This band is then cut into individual pads, eliminating the need for grinding components that create incoherent fibres. The pre-formed band structure prevents fibre scattering and enables compact machine design while maintaining pad production capability.
2Productivity
If pads are handled along a rectilinear feed path, then assembly steps can be performed, but the first web becomes misaligned causing incorrect positioning of pads and components
Solution Approach 1:
The patent applies curvature by replacing the rectilinear feed path with a convoluted S-shaped path guided by rollers. This curved trajectory maintains constant tension and alignment of the first web throughout the assembly process, preventing misalignment issues that occur with straight-line conveyance. The S-path enables precise pad positioning while maintaining productivity.
3Volume of stationary object
If a stable band of absorbent material is used instead of incoherent fibres, then space requirements are reduced and handling is improved, but the material structure must be changed
Solution Approach 1:
The patent applies parameter changes by transforming the absorbent material from an incoherent fibre state to a structured continuous band form. This structural parameter change stabilizes the material, preventing scattering and enabling compact handling. The band structure maintains the absorbent properties while improving dimensional stability for machine processing.
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 machine achieves a significant reduction in defective items and overall size, enabling more precise and efficient production with fewer rejects by stabilizing absorbent material handling and improving alignment precision.
Implementation Method 1
The fibres are then gathered into special vacuum pockets to form the pads
Implementation Method 2
the surface of the web having been primed with adhesive
Data Source
Figure 1
Figure 2
AI summary
Personal sanitary items are manufactured by a machine comprising a first feed system (2) directing a first continuous web (3) of material along a given feed path (P), a device (9) serving to make a succession of absorbent pads and apply the single pads to the first web (3) of material, and a second feed system (19) supplying a second continuous web (20) of material that is bonded ultimately to the first web (3), with the pads sandwiched between, to produce a continuous succession of sanitary items. The pad-making device (9) comprises at least one cutter (12) by which a continuous band (11) of absorbent material is divided up to produce the succession of pads, and the feed path (P) follows a convoluted trajectory substantially of "S" configuration.