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US 6,204,210 B1Granted
Composite nonwoven material fabrication, process and application to absorbent hygienic articles
AssigneeAvgol Ltd.
InventorJean-Pierre Koczab
Life of this patent
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Abstract
A composite nonwoven material having two external layers, formed of body fluid permeable nonwoven material, between which is arranged a synthetic fiber lap which is permeable to body fluids. The external layers are assembled between each other by thermal fusion according to a pattern forming a network of points and a central area of perforations. The composite nonwoven material can be used to make absorbent hygienic articles.
Claims13
A composite nonwoven material comprising:
- a lower outer layer made of a nonwoven material permeable to body fluids and having a first melting point,
- an upper outer layer made of a nonwoven material permeable to body fluids and having a melting point near said first melting point,
- a synthetic fiber lap permeable to body fluids being arranged between said outer layers, said fiber lap comprising loose carded filaments made of a material having a second melting point substantially higher that said first melting point, the outer layers being assembled together by hot melting according to a pattern forming a network of spots, said hot melting having been made at a temperature near said first melting point so that the filaments of said fiber lap remain unmelted when said upper and lower outer layers are hot melted,
- the upper outer nonwoven layer comprising a hydrophilic longitudinal central zone delimited by continuous weld lines made between the two outer layers and forming barriers to the transverse diffusion of body fluids, and
- said hydrophilic longitudinal central zone including a perforated central zone having perforations extending all the way through the outer layers and the synthetic fiber lap.
2 more elements
A method for manufacturing a composite nonwoven material, comprising the steps of:
- unwinding simultaneously a synthetic fiber lap permeable to body fluids and two nonwoven laps permeable to body fluids,
- inserting the synthetic fiber lap between the two nonwoven laps,
- feeding the assembly as a whole to a calendering device, allowing uniform spot bonding between at least the nonwoven laps by hot melting to obtain a composite band, and feeding the assembly to a performation device in order to obtain a perforated central zone, through the composite band,
- subsequently feeding the composite band to a welding device to produce a first pair of continuous weld lines, symmetrical to a longitudinal center axis of the band, between at least the two nonwoven laps, in the vicinity of each longitudinal edge of said band, and, to produce a second pair of continuous weld lines which are symmetrical to the longitudinal center axis of the band, and the transverse spacing of which is smaller than that of the first pair and which thus delimits a hydrophilic longitudinal central zone on the upper face of said composite nonwoven material, said hydrophilic longitudinal central zone including the perforated central zone.
1 more element
Dependencies are inferred from the claim text.