EP0081869A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A non-woven tube for membrane filtration and method of forming same
Assignee: Stork Friesland BV
•
Filing: 1982-11-25
•
Granted: —
•
Expires: 2002-11-25
Abstract
Abstract A composite tube (1) of a heat-sealable non-woven material comprises an inner and an outer tube of non-woven (2, 3), each of said tubes being provided with a longitudinal seal (4, 5) obtained by ultrasonic sealing, the outer and inner tube (3, 2) being fixed with each other by adhesive spots (6). The inner side of the inner non-woven tube is coated with a membrane (8) for membrane filtration. The seal (5) formed by ultrasonic sealing in the outer tube (3) does not extend to the inner side of the inner tube (2) and preferably the seals (5, 4) in the outer and inner tube (3, 2) are staggered with respect to each other. The composite tube (1) is formed by first forming the inner tube (2), applying spots (6) of an adhesive upon the outer side of the inner tube, and subsequently applying the outer tube (3) onto the inner tube (2). During the step of forming the longitudinal seal (5) by ultrasonic sealing in the outer tube (3), it is avoided that the seal as formed extends toward the inner side of the inner tube.
Inventors
- 👤 Cornelis Van Zon
- 👤 Gerrit Jan Jonkeren
- 👤 Hilbert Eggengoor
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B29; B29C; B29C53/00; B29C53/36; B29C53/38; B29C53/382; B29C65/00; B29C65/02; B29C65/08; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/21; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5227; B29C66/52271; B29C66/52272; B29C66/63; B29C66/70; B29C66/72; B29C66/727; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/02; B32B27/06; B32B27/08; B32B27/12; B32B27/36; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B7/00; B32B7/04; B32B7/12; B32B7/14; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/70; D04H1/76; B01D2239/00; B01D2239/10; B29C66/71; B29K; B29K2001/00; B29K2001/08; B29K2001/12; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29L; B29L2009/00; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A tube of a heat-sealable non-woven material comprising a longitudinally extending connecting seal, more particularly a longitudinal seal obtained by ultrasonic sealing, said tube being a composite tube (1)comprising an innermost non-woven tube (2) and another outermost non-woven tube (3) surrounding the innermost non-woven tube (2) and each comprising a longitudinally extending connecting seal, said non-woven tubes being mutually fixed against shifting, with respect to each other.
Claim 2
Dependent Claim
67 words
A tube of a heat-sealable non-woven material comprising a longitudinally extending connecting seal, more particularly a longitudinal seal obtained by ultrasonic sealing, said tube being a composite tube (1)comprising an innermost non-woven tube (2) and another outermost non-woven tube (3) surrounding the innermost non-woven tube (2) and each comprising a longitudinally extending connecting seal, said non-woven tubes being mutually fixed against shifting, with respect to each other.
Claim 3
Dependent Claim
39 words
Tube as claimed in claim 1, wherein the first connecting seal (4) of the innermost non-woven tube and another connecting seal (5) of the other outermost non-woven tube are applied in a staggered manner with respect to each other.
Claim 4
Dependent Claim
29 words
Tube as claimed in claim 1 and 2, wherein the innermost and the other outermost non-woven tube are locally interconnected by an adhering means, more particularly a glue (6).
Claim 5
Dependent Claim
21 words
Tube as claimed in claim 1-3, wherein the other outermost non-woven tube (3) is thicker than the innermost non-woven tube (2).
Claim 6
Dependent Claim
30 words
Tube as claimed in claim 1-4, wherein the other outermost non-woven tube is provided with a longitudinal seal after the formation of a longitudinal seal in the innermost non-woven tube.
Claim 7
Dependent Claim
14 words
Tube as claimed in claim 1, provided with a membrane (8) for membrane filtration.
Claim 8
Dependent Claim
36 words
A tube as claimed in claim 4, wherein the thickness of the innermost non-woven tube with respect to the other outermost non-woven tube is in a ratio comprised between 1 : 1 to 1 : 3.
Claim 9
Independent Claim
69 words
A method of forming a tube of non-woven material from a heat-sealable non-woven, comprising a longitudinally extending connecting seal, more particularly a longitudinal seal obtained by ultrasonic sealing, wherein an innermost non-woven tube (2) is surrounded by another outermost non-woven tube (3) said non-woven tubes being mutually fixed against shifting with respect to each other and. each being provided with a longitudinal seal obtained by an ultrasonic sealing procedure.
Claim 10
Independent Claim
69 words
A method of forming a tube of non-woven material from a heat-sealable non-woven, comprising a longitudinally extending connecting seal, more particularly a longitudinal seal obtained by ultrasonic sealing, wherein an innermost non-woven tube (2) is surrounded by another outermost non-woven tube (3) said non-woven tubes being mutually fixed against shifting with respect to each other and. each being provided with a longitudinal seal obtained by an ultrasonic sealing procedure.
References Cited (Backward Citations)
GB1256491A
Cited
US4214612A
Cited
FR2276860A1
Cited
DE2629719A1
Cited
FR2380129A1
Cited
FR2477962A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.