GB2298659A - Tubular knitted retention fabric - Google Patents

Tubular knitted retention fabric Download PDF

Info

Publication number
GB2298659A
GB2298659A GB9504734A GB9504734A GB2298659A GB 2298659 A GB2298659 A GB 2298659A GB 9504734 A GB9504734 A GB 9504734A GB 9504734 A GB9504734 A GB 9504734A GB 2298659 A GB2298659 A GB 2298659A
Authority
GB
United Kingdom
Prior art keywords
retention device
yarn
heat shrinkable
tubular retention
knitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9504734A
Other versions
GB9504734D0 (en
Inventor
John Gordon Stanier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New House Textiles Ltd
Original Assignee
New House Textiles Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New House Textiles Ltd filed Critical New House Textiles Ltd
Priority to GB9504734A priority Critical patent/GB2298659A/en
Publication of GB9504734D0 publication Critical patent/GB9504734D0/en
Publication of GB2298659A publication Critical patent/GB2298659A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/18—Other fabrics or articles characterised primarily by the use of particular thread materials elastic threads
    • D04B1/20—Other fabrics or articles characterised primarily by the use of particular thread materials elastic threads crimped threads

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Knitting Of Fabric (AREA)

Description

"A Retention Device and a Method of Making Same" This invention relates to a retention device and a method of making the same.
There is a need for a tubular retention device which can be put in place easily and then heat shrunk to hold two or more parts together. One application for such a retention device is to hold filter material on a perforated core.
According to a first aspect of the present invention there is provided a tubular retention device made of knitted fabric and including a heat shrinkable yarn which, when heated to an elevated temperature, shrinks and retains its shrunken form at ambient temperature.
Preferably, the yarn is a polyethylene yarn which has been extended in manufacture and then exposed to ionising radiation to modify its molecular structure by cross linking.
The retention device could be made wholly of the heat shrinkable yarn but it is preferable that the retention device also includes a non-heat shrinkable material, such as cotton, and typically only about one knitted row out of every four such rows is of the heat shrinkable yarn. In this case, the stitch length of the yarn may be made smaller than the stitch length of the cotton by drawing a smaller loop in the yarn.
According to a second aspect of the invention there is provided a method of making a tubular retention device in which the device is knitted and includes a heat shrinkable yarn which, when heated to an elevated temperature, shrinks and retains its shrunken form at ambient temperature.
Preferably, the device is knitted on a multi-feeder circular knitting machine.
According to yet another aspect of the invention there is provided a filter unit including a tubular retention device according to said first aspect of the invention or made according to said second aspect of the invention, which retention device has been heat shrunk to hold filter material on a perforated core.
In one embodiment of the invention the retention device is in the form of a sleeve knitted from cotton and a heat shrinkable polyethylene yarn. The yarn is formed by extrusion, extended typically to about 8 to 10 times its extruded length to increase its strength and then exposed to ionising radiation, typically high voltage electrons, to modify its molecular structure by cross linking. This results in a yarn which will shrink but not melt when exposed to an elevated temperature, typically a temperature of about 1300C, and which retains its shrunken form at ambient temperature.
The sleeve is knitted on a multi-feeder circular knitting machine and typically only one row in four is of the polyester yarn, the other rows being knitted from the cotton.
The stitch length of the yarn may be slightly smaller than the stitch length of the cotton so that shrinkage at an elevated temperature has more effect.
In an alternative embodiment, the heat shrinkable yarn could be laid in a structure knitted from non-heat shrinkable material during knitting thereof.
The retention device has particular application in holding filter material on a perforated core of a filter unit, typically a unit used to filter fuel to aircraft. In this case, the retention device is placed over the filter material on the core and then heated to about 1300. The yarn shrinks and retains its shrunken form at ambient temperature to hold the filter material against the core.
It is envisaged that the retention device will have other applications.

Claims (10)

1. A tubular retention device made of knitted fabric and including a heat shrinkable yarn which, when heated to an elevated temperature, shrinks and retains its shrunken form at ambient temperature.
2. A tubular retention device as claimed in claim 1, wherein the yarn is a polyethylene yarn which has been extended in manufacture and then exposed to ionising radiation to modify its molecular structure by cross linking.
3. A tubular retention device as claimed in claim 1 or claim 2, further comprising a non-heat shrinkable material.
4. A tubular retention device as claimed in claim 3, wherein only about one knitted row out of every four such rows is of heat shrinkable yarn.
5. A tubular retention device as claimed in claim 3 or claim 4, wherein the stitch length of the yarn is made smaller than the stitch length of the non-heat shrinkable material by drawing a smaller loop in the yarn.
6. A tubular retention device as claimed in claim 3, wherein the heat shrinkable yarn is laid in a structure knitted from non-heat shrinkable material during knitting thereof.
7. A tubular retention device substantially as hereinbefore described.
8. A method of making a tubular retention device in which the device is knitted and includes a heat shrinkable yarn which, when heated to an elevated temperature, shrinks and retains its shrunken form at ambient temperature.
9. A method as claimed in claim 8, wherein the tubular retention device is knitted on a multi-feeder circular knitting machine.
10. A filter unit including a tubular retention device according to any one of claims 1 - 7 or made according to claim 8 or claim 9, which retention device has been heat shrunk to hold filter material on a perforated core.
GB9504734A 1995-03-09 1995-03-09 Tubular knitted retention fabric Withdrawn GB2298659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9504734A GB2298659A (en) 1995-03-09 1995-03-09 Tubular knitted retention fabric

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9504734A GB2298659A (en) 1995-03-09 1995-03-09 Tubular knitted retention fabric

Publications (2)

Publication Number Publication Date
GB9504734D0 GB9504734D0 (en) 1995-04-26
GB2298659A true GB2298659A (en) 1996-09-11

Family

ID=10770896

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9504734A Withdrawn GB2298659A (en) 1995-03-09 1995-03-09 Tubular knitted retention fabric

Country Status (1)

Country Link
GB (1) GB2298659A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB570894A (en) * 1943-10-14 1945-07-27 Chloride Electrical Storage Co Improvements relating to separators for electric accumulators
GB1020838A (en) * 1963-11-12 1966-02-23 Walter Neville Vickerstaff Tubular elements
GB1096231A (en) * 1963-11-06 1967-12-20 Dunlop Rubber Co Manufacture of footwear
US3669157A (en) * 1970-06-01 1972-06-13 Carolina Narrow Fabric Co Shrinkable tubular fabric
FR2472407A1 (en) * 1979-12-25 1981-07-03 Vitebskij Tech I Legkoj Promy FILTERING HANDLE AND MANUFACTURING METHOD THEREOF
EP0115905A2 (en) * 1983-01-06 1984-08-15 Raychem Limited Dimensionally heat recoverable article
DD237613A1 (en) * 1985-05-23 1986-07-23 Schwermasch Liebknecht Veb K METHOD FOR MANUFACTURING SEGMENT EXISTING BODIES
GB2193980A (en) * 1986-06-13 1988-02-24 Kenty Caroline Anne Mc Fabric
WO1988007847A1 (en) * 1987-04-11 1988-10-20 Smith And Nephew Associated Companies Plc Bandages
US5084174A (en) * 1990-10-23 1992-01-28 Tamfelt Oy Ab Filter bag for a machine screen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB570894A (en) * 1943-10-14 1945-07-27 Chloride Electrical Storage Co Improvements relating to separators for electric accumulators
GB1096231A (en) * 1963-11-06 1967-12-20 Dunlop Rubber Co Manufacture of footwear
GB1020838A (en) * 1963-11-12 1966-02-23 Walter Neville Vickerstaff Tubular elements
US3669157A (en) * 1970-06-01 1972-06-13 Carolina Narrow Fabric Co Shrinkable tubular fabric
FR2472407A1 (en) * 1979-12-25 1981-07-03 Vitebskij Tech I Legkoj Promy FILTERING HANDLE AND MANUFACTURING METHOD THEREOF
EP0115905A2 (en) * 1983-01-06 1984-08-15 Raychem Limited Dimensionally heat recoverable article
DD237613A1 (en) * 1985-05-23 1986-07-23 Schwermasch Liebknecht Veb K METHOD FOR MANUFACTURING SEGMENT EXISTING BODIES
GB2193980A (en) * 1986-06-13 1988-02-24 Kenty Caroline Anne Mc Fabric
WO1988007847A1 (en) * 1987-04-11 1988-10-20 Smith And Nephew Associated Companies Plc Bandages
US5084174A (en) * 1990-10-23 1992-01-28 Tamfelt Oy Ab Filter bag for a machine screen

Also Published As

Publication number Publication date
GB9504734D0 (en) 1995-04-26

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)