Patent EP0409535A1 successfully refreshed from Google Patents.
EP0409535A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A nonwoven fabric and a method of manufacturing the same
Assignee: Mitsui Chemicals Inc uni-Charm Corp
•
Filing: 1990-07-16
•
Granted: —
•
Expires: 2010-07-16
Abstract
Abstract This invention provides a bulky nonwoven fabric comprising a base cloth layer (1) made of thermoplastic fiber-like filaments and having densely distributed holes (1a) and a large number of cylindrical projections (2), each projection (2) standing from the peripheral edge of one of the holes (1a) and made of thermoplastic fiber-like filaments the height (h) of the projection (2) being at least twice the thickness (t) of the base cloth layer (1). The nonwoven fabric can be made by blowing molten filaments out of a melt-blow die onto a porous plate provided with a large number of air passage holes under a condition where ambient air pressure on the side of the plate facing the die is kept higher than the air pressure on the other side of the plate so that some of the filaments project through the air passage holes to form so many cylindrical projections due to the difference of pressure, the aggregate of filaments being then taken away from the porous plate.
Inventors
- 👤 Takayuki C/O Mitsui Petrochemical Ind. Ltd Mende
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:27
CPC Classifications
D; D04; D04H; D04H11/00; D04H11/08; D04H3/00; D04H3/08; D04H3/16; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D04H1/70; D04H1/74; D04H3/005; D04H3/007; D04H3/02; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24628; Y10T428/24661; Y10T428/24669; Y10T428/24678; Y10T428/24802; Y10T428/24826
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
62 words
A nonwoven fabric comprising a base cloth layer made of thermoplastic fiber-like filaments and having a number of holes, each of the holes having a peripheral edge and carrying a cylindrical projection standing from the peripheral edge, the cylindrical projections being made of thermoplastic fiber-like filaments, the height of the projections being at least twice the thickness of the base cloth layer.
Claim 2
Dependent Claim
62 words
A nonwoven fabric comprising a base cloth layer made of thermoplastic fiber-like filaments and having a number of holes, each of the holes having a peripheral edge and carrying a cylindrical projection standing from the peripheral edge, the cylindrical projections being made of thermoplastic fiber-like filaments, the height of the projections being at least twice the thickness of the base cloth layer.
Claim 3
Dependent Claim
18 words
A nonwoven fabric according to claim 1, wherein each of the cylindrical projections has a closed free end.
Claim 4
Dependent Claim
18 words
A nonwoven fabric according to claim 1, wherein each of the cylindrical projections has an open free end.
Claim 5
Dependent Claim
27 words
A nonwoven fabric according to claim 1, 2 or 3, wherein each of the cylindrical projections has a stem portion substantially perpendicular to the base cloth layer.
Claim 6
Dependent Claim
23 words
A nonwoven fabric according to any one of the preceding claims which also comprises a resin film layer on the base cloth layer.
Claim 7
Dependent Claim
25 words
A nonwoven fabric according to claim 5, wherein the resin film layer is on the side of the base cloth layer having said cylindrical projection.
Claim 8
Dependent Claim
21 words
A nonwoven fabric according to claim 6, wherein the resin film layer covers the outer peripheral surface of the cylindrical projections.
Claim 9
Dependent Claim
24 words
A nonwoven fabric according to any one of the preceding claims wherein the diameter of the holes is between 0.2 mm and 6 mm.
Claim 10
Dependent Claim
22 words
A nonwoven fabric according to any one of the preceding claims wherein the number of holes per 1cm² is at least 2.
Claim 11
Dependent Claim
35 words
A nonwoven fabric according to any one of the preceding claims wherein the diameter of the holes is between 0.2 mm and 1 mm and the number of holes per 1cm² is at least 50.
Claim 12
Independent Claim
89 words
A method of manufacturing a nonwoven fabric which comprises blowing melt-blow type filaments from a melt-blow die toward a porous plate having a number of air passage holes to deposit the filaments on the plate while reducing the air pressure on the side of the plate other than the filament carrying side relative to that of the filament carrying side to draw some of the filaments through the air passage holes and form cylindrical projections and separating the aggregate of filaments from the porous plate as a nonwoven fabric.
Claim 13
Independent Claim
89 words
A method of manufacturing a nonwoven fabric which comprises blowing melt-blow type filaments from a melt-blow die toward a porous plate having a number of air passage holes to deposit the filaments on the plate while reducing the air pressure on the side of the plate other than the filament carrying side relative to that of the filament carrying side to draw some of the filaments through the air passage holes and form cylindrical projections and separating the aggregate of filaments from the porous plate as a nonwoven fabric.
Claim 14
Independent Claim
142 words
A method of manufacturing a nonwoven fabric comprising the steps of: placing a sheet of a resin film on a porous plate provided with a number of air passage holes and heating the resin film above the softening point of the resin, reducing the air pressure on the side of the plate other than the film-carrying side relative to that of the film carrying side so that the resin film projects through the air passage holes and forms cylindrical film projections having an open free and, subsequently blowing molten filaments from a melt-blow die onto the resin film with the cylindrical film projections to deposit filaments on the resin film into the cylindrical film projections to form cylindrical-projections of the filaments within the cylindrical film projections, and separating the assembly of film and filaments from the porous plate as a nonwoven fabric.
Claim 15
Independent Claim
142 words
A method of manufacturing a nonwoven fabric comprising the steps of: placing a sheet of a resin film on a porous plate provided with a number of air passage holes and heating the resin film above the softening point of the resin, reducing the air pressure on the side of the plate other than the film-carrying side relative to that of the film carrying side so that the resin film projects through the air passage holes and forms cylindrical film projections having an open free and, subsequently blowing molten filaments from a melt-blow die onto the resin film with the cylindrical film projections to deposit filaments on the resin film into the cylindrical film projections to form cylindrical-projections of the filaments within the cylindrical film projections, and separating the assembly of film and filaments from the porous plate as a nonwoven fabric.
Claim 16
Dependent Claim
27 words
A method according to claim 11, wherein the nonwoven fabric is separated from the porous plate after cylindrical projections have formed each having a close free end.
Claim 17
Dependent Claim
27 words
A method according to claim 11, wherein the nonwoven fabric is separated from the porous plate after cylindrical projections have formed each having an open free end.
Claim 18
Dependent Claim
64 words
A method according to claim 11 or 12, wherein the porous plate is sufficiently close to the melt-blow die for the air blow pressure applied from the melt-blow die to generate a pressure difference between the two sides of the porous plate and drive filaments into the air passage holes of the porous plate to form projections on the other side of the plate.
Claim 19
Independent Claim
23 words
A method according to any one of claims 11 to 15 wherein the porous plate is a 5 to 60 mesh metal net.
References Cited (Backward Citations)
FR1325137A
Cited
FR1554900A
Cited
AT351280B
Cited
DE2532032A1
Cited
GB2112828A
Cited
GB2180271A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.