IE55065B1 - Protective sleeve for an information carrier - Google Patents
Protective sleeve for an information carrierInfo
- Publication number
- IE55065B1 IE55065B1 IE733/84A IE73384A IE55065B1 IE 55065 B1 IE55065 B1 IE 55065B1 IE 733/84 A IE733/84 A IE 733/84A IE 73384 A IE73384 A IE 73384A IE 55065 B1 IE55065 B1 IE 55065B1
- Authority
- IE
- Ireland
- Prior art keywords
- protective sleeve
- weight
- fibre web
- bonded fibre
- sleeve according
- Prior art date
Links
- 230000001681 protective effect Effects 0.000 title claims description 21
- 229920000297 Rayon Polymers 0.000 claims abstract description 11
- 239000006229 carbon black Substances 0.000 claims abstract description 9
- 238000009987 spinning Methods 0.000 claims abstract description 8
- 229920000728 polyester Polymers 0.000 claims abstract description 7
- 238000005299 abrasion Methods 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 6
- 239000004743 Polypropylene Substances 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 229920001155 polypropylene Polymers 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 5
- 239000004952 Polyamide Substances 0.000 claims abstract description 3
- 229920002647 polyamide Polymers 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 31
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 239000004745 nonwoven fabric Substances 0.000 abstract 1
- 239000000969 carrier Substances 0.000 description 7
- 208000012886 Vertigo Diseases 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 210000004209 hair Anatomy 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/03—Containers for flat record carriers
- G11B23/033—Containers for flat record carriers for flexible discs
- G11B23/0332—Containers for flat record carriers for flexible discs for single discs, e.g. envelopes
Abstract
1. An abrasion-resistant sleeve for an information carrier, in particular for a magnetic data carrier, comprising an antistatic nonwoven fabric which has been consolidated without a binder by pointlike thermal welding only, which has a surface resistance of less than 10**9 ohms at up to temperatures above 100 degrees C, and contains electro-conductive polypropylene, polyester, viscose and/or polyamide fibres which contain from 20 to 40% by weight, based on the total weight, of finely divided carbon black incorporated during spinning.
Description
- 2 - - 2 - 550S5 This invention relates to an abrasion-resistant protective sleeve which is intended for an information carrier, in particular for a magnetic data carrier, and which is heat-resistant at temperatures up to more than 5 100°C.
Information carriers, in particular flexible magnetic data carriers, the so-called floppy disks, consist of a coated magnetic film. To protect the magnetic film against mechanical damage and especially against manual 10 contact it is stored in a protective sleeve which is conventionally made of paper, plastics material or the like. Protective sleeves made of PVC film and coated on the inner surface with a bonded fibre web also exist. The main function of the bonded fibre web is to absorb 15 the dirt and the dust particles produced while in use, to ensure that the data carrier inside the sleeve has a low and regular torque, and to protect the magnetic film from the PVC. The large number of small upright hairs on the bonded fibre web with which the PVC sleeve 20 is lined on the inside surface at the same time clean the magnetic film without, however, scratching it. The hairs of the bonded fibre web also have the effect of safely holding the magnetic film by bending in the direction of the moving information carrier as it is removed 25 from and reintroduced into the protective sleeve. In contrast to rigid sheeting or stiff paper, the bending hairs provide support points which ensure gentle sliding of the disk.
There are also already known protective sleeves 30 which are made of pure bonded fibre web and have the favourable properties described above. However, in spite of the basically high suitability of bonded fibre web protective sleeves it has nevertheless been found to - 3 - - 3 -55065 be a disadvantage that the binder mixtures used in the bonded fibre web have an adverse effect on the magnetic film, giving, in certain circumstances, rise to decomposition products. However, a particularly difficult problem is storage at high temperatures. Such high temperatures, however, can easily arise on prolonged use of the information equipment and even on storing magnetic carriers, for example magnetic tapes in motor vehicles. The high temperature, for example in the glove compartment of a motor vehicle, renders the magnetic tapes stored therein more or less unusable, because they are damaged or even destroyed by unsuitable protective sleeves.
Japanese unexamined Patent Application No. 57-94965 describes an adhesively attachable inner part for a record sleeve, which is made from a mixture of plastics fibres and carbon-containing synthetic resin fibres and has a non-woven structure.
It is thus an object of the invention to develop an abrasion-resistant protective sleeve for information carriers, in particular for magnetic data carriers, such as magnetic tapes, floppy disks or the like, which is heat-resistant at temperatures up to more than 100°C and has practically no adverse effect on the information carriers, even under extreme conditions, in particular at high temperatures.
According to the invention there is provided an abrasion-resistant protective sleeve which is intended for an information carrier, in particular for a magnetic data carrier, the sleeve comprising an antistatic bonded fibre web which has been consolidated without a binder by pointlike thermal welding only, which has a surface 9 resistance of less than 10 ohm at temperatures up to more than 100°C and which contains electrically conductive polypropylene, polyester, viscose and/or polyamide fibres - 4 - - 4 -55065 containing from 20 to 40% by weight, based on the total weight, of finely divided carbon black incorporated during spinning.
The protective sleeve is made of bonded fibre web 5 to take advantage of the known good mechanical properties and in particular the cleansing effect due to the projecting surface hairs. Bonded fibre webs made of polypropylene, polyester and/or viscose are preferable but bonded nylon webs are also highly suitable. The fibres in the bonded 10 fibre web have been rendered electrically conductive by filling with finely divided carbon black spun into the fibre of the spinning stage in amounts of 20 to 40% by weight on total weight of fibre, ensuring that the surface resistance of the bonded fibre web of the protective sleeve 9 15 is less than 10 ohm at all operating temperatures, i.e. at temperatures from ambient at least up to 100°C.
The specific resistance of the fibres used according to the invention is about 10 ohm per cm per dtex. The fibres preferably have a linear density of 3 to 20 6 dtex.
The protective sleeve made of such fibres is mechanically and thermally resistant and does not react with the sensitive magnetic data carrier. The specified surface . 9 resistance of less than 10 ohm, advantageously even less 25 than 10 ohm, holds for the entire operating temperature range and is independent of the humidity. In the case of particularly sensitive data carriers it is advisable to use soft bonded fibre webs made of viscose fibres.
If desired, electrically non-conductive fibres can be ad-30 mixed if it is ensured that the surface resistance of the bonded fibre web is within the specified range under the prevalent atmospheric conditions as a result of the presence of electrically conductive fibres. Subsequent finishing with an antistatic agent is as dispensable as the 35 customarily added binders and finely divided electrically conductive materials. When used in the floppy disk liner - 5 - - 5 -55065 there is no danger of damaging the magnetic film. To stiffen it, the bonded fibre web of the protective sleeve is desirably provided on its outer surface with a reinforcing layer of paper or of plastics film, preferably by lamination.
The following Examples serve to illustrate the invention.
Example 1 A fibre mixture of 50% by weight of polyester fibres of 1.7 dtex and 40 mm cut length and 50% by weight of viscose fibres of 3.3 dtex and 60 mm cut length which have been made conductive by incorporating 30% by weight of finely divided carbon black at the spinning stage (the percentages by weight of carbon black being based on the total weight of the filled viscose fibres) is blended on a card and is laid into a web via a carding machine. The web is consolidated by point-welding by means of a heated calender using an appropriately embossed roll. The bonded fibre web has a weight of 50 g/m^ and 3 a surface resistance of 10 ohm. This bonded fibre web is used to make up an abrasion-resistant sleeve for a magnetic data carrier (floppy disk). The sleeve has not changed adversely even after a three-month storage period at 120°C.
Example 2 A web is prepared from a fibre blend comprising 45% by weight of polypropylene fibres of 3.3 dtex and 60 mm cut length and 20% by weight of viscose fibres which contain 30% by weight of finely divided carbon black introduced during spinning. The blend then has added to it 35% by weight of non-conductive viscose fibres. The web is point-welded as indicated in Example 1, and the result- 2 ing bonded web has a weight of 30 g/m and a surface 55065 - 6 -4 resistance of 10 ohm. The whole of the outer surface of the bonded fibre web is then laminated with paper.
The protective sleeve made from this bonded web is likewise unchanged after storage for several months at temperatures 5 between 100 and 120°C.
Example 3 A point-welded fibre web is prepared from a fibre blend comprising 50% by weight of nylon 66 (1.7 dtex, 40 mm cut length), 47% by weight of pure viscose (1.7 dtex, 38 mm cut length) and 3% by weight of electrically conduct-10 ive viscose obtained, as described in Examples 1 and 2, by introducing finely divided carbon black at the spinning 2 stage. The bonded fibre web has a weight of 25 g/m .
It is laminated with a polyethylene film. The surface resistance is 10^ ohm. Storage for several months at 15 temperatures between 100 and 120°C of a sleeve manufactured from such a bonded fibre web produces no change in the mechanical and electrical properties.
Example 4 A fibre web comprising 80% by weight of polyester fibres (2.2 dtex, 40 mm cut length) and 20% by weight of 20 polyester fibres of 3 dtex and 60 mm cut length which contain 40% by weight of conductive finely divided carbon black introduced at the spinning stage is consolidated by point-welding. The bonded fibre web has a weight of 2 7 8 25 g/m . The surface resistance is 10 to 10 ohm. This 25 bonded fibre web is used to manufacture a protective sleeve which is stored for several months under varying humidity conditions at temperatures between 100 and 120°C. No adverse mechanical and electrical properties are produced.
The magnetic film inside the sleeve is fully operational 30 even after storage for several months.
Claims (5)
1. An abrasion-resistant protective sleeve intended for an information carrier, in particular for a magnetic data carrier, the sleeve comprising an antistatic bonded fibre web which has been consolidated without a binder 5 by pointlike thermal welding only, which has a surface 9 resistance of less than 10 ohm at temperatures up to more than 100°C, and which contains electrically conductive polypropylene, polyester, viscose and/or polyamide fibres containing from 20 to 40% by weight, based on the total 10 weight, of finely divided carbon black incorporated during spinning.
2. A protective sleeve according to claim 1, wherein the bonded fibre web has been provided on its outer surface with a reinforcing layer of paper or of plastics film. 15
3. A protective sleeve according to claim 2, charact erized in that the layer has been applied by laminating.
4. A protective sleeve according to claim 1 and substantially as hereinbefore described or exemplified.
5. A combination of a protective sleeve according 20 to any of claims 1 to 4 and a magnetic data carrier. F. R. KELLY & CO., AGENTS FOR THE APPLICANTS.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833326597 DE3326597A1 (en) | 1983-07-23 | 1983-07-23 | PROTECTIVE COVER FOR AN INFORMATION CARRIER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE840733L IE840733L (en) | 1985-01-23 |
| IE55065B1 true IE55065B1 (en) | 1990-05-09 |
Family
ID=6204742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE733/84A IE55065B1 (en) | 1983-07-23 | 1984-03-26 | Protective sleeve for an information carrier |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0133441B1 (en) |
| JP (1) | JPS6043278A (en) |
| KR (1) | KR910007483B1 (en) |
| AT (1) | ATE40762T1 (en) |
| DE (2) | DE3326597A1 (en) |
| IE (1) | IE55065B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0740425B2 (en) * | 1985-04-30 | 1995-05-01 | 日立マクセル株式会社 | Floppy disk |
| DE3765293D1 (en) * | 1986-04-25 | 1990-11-08 | Hitachi Maxell | DISK CASSETTE. |
| DE9110661U1 (en) * | 1991-08-29 | 1991-10-17 | Basf Magnetics Gmbh, 6800 Mannheim, De |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2460797A1 (en) * | 1971-10-06 | 1976-07-01 | Ted Bildplatten | Protective cover for record - has square profile with thick cardboard cover and soft interior lining |
| DE2325715C3 (en) * | 1973-05-21 | 1980-08-28 | Ted Bildplatten Ag Aeg-Telefunken- Teldec, Zug (Schweiz) | Protective cover for an information carrier, in particular for an optical disc |
| DE2457542C2 (en) * | 1974-12-03 | 1976-10-21 | Arnold Hohner | USING A FELT WITH INTEGRATED METAL PARTS |
| JPS53110514A (en) * | 1977-03-08 | 1978-09-27 | Fuji Photo Film Co Ltd | Disc jacket for magnetic recording |
| JPS53146612A (en) * | 1977-05-26 | 1978-12-20 | Hitachi Maxell | Plastic jacket for magnetic record disc |
| JPS558151U (en) * | 1978-06-30 | 1980-01-19 | ||
| US4354213A (en) * | 1980-06-02 | 1982-10-12 | Verbatim Corporation | Self-lubricating liner |
| JPS5737782A (en) * | 1980-08-19 | 1982-03-02 | Hiraoka & Co Ltd | Record sleeve |
| JPS5794965A (en) * | 1980-12-02 | 1982-06-12 | Hitachi Maxell Ltd | Liner for magnetic disk jacket |
| US4413298A (en) * | 1981-05-05 | 1983-11-01 | Minnesota Mining And Manufacturing Company | Diskette jacket |
| DE3137788C2 (en) * | 1981-09-23 | 1984-01-12 | Peter Heinrich 2000 Hamburg Urdahl | Protective cover for a disc-shaped sound and / or video signal recording medium with an antistatic effect |
-
1983
- 1983-07-23 DE DE19833326597 patent/DE3326597A1/en active Granted
- 1983-11-08 DE DE8383111124T patent/DE3379186D1/en not_active Expired
- 1983-11-08 AT AT83111124T patent/ATE40762T1/en not_active IP Right Cessation
- 1983-11-08 EP EP83111124A patent/EP0133441B1/en not_active Expired
-
1984
- 1984-02-22 KR KR1019840000843A patent/KR910007483B1/en not_active IP Right Cessation
- 1984-03-26 IE IE733/84A patent/IE55065B1/en not_active IP Right Cessation
- 1984-07-13 JP JP59145880A patent/JPS6043278A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3326597A1 (en) | 1985-02-07 |
| JPS6043278A (en) | 1985-03-07 |
| EP0133441A3 (en) | 1986-04-09 |
| KR850001608A (en) | 1985-03-30 |
| ATE40762T1 (en) | 1989-02-15 |
| EP0133441B1 (en) | 1989-02-08 |
| DE3326597C2 (en) | 1988-02-25 |
| DE3379186D1 (en) | 1989-03-16 |
| EP0133441A2 (en) | 1985-02-27 |
| IE840733L (en) | 1985-01-23 |
| KR910007483B1 (en) | 1991-09-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed |