EP0530571A1 - Enveloppe protectrice pour un support d'enregistrement en forme de disque, notamment pour disques souples - Google Patents

Enveloppe protectrice pour un support d'enregistrement en forme de disque, notamment pour disques souples Download PDF

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Publication number
EP0530571A1
EP0530571A1 EP92113965A EP92113965A EP0530571A1 EP 0530571 A1 EP0530571 A1 EP 0530571A1 EP 92113965 A EP92113965 A EP 92113965A EP 92113965 A EP92113965 A EP 92113965A EP 0530571 A1 EP0530571 A1 EP 0530571A1
Authority
EP
European Patent Office
Prior art keywords
protective cover
coating
chlorine
plastic
paper
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Withdrawn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
EP92113965A
Other languages
German (de)
English (en)
Inventor
Dieter Koob
Juergen Wolf
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.)
Emtec Magnetics GmbH
Original Assignee
BASF Magnetics GmbH
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 BASF Magnetics GmbH filed Critical BASF Magnetics GmbH
Publication of EP0530571A1 publication Critical patent/EP0530571A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/54—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles of special shape not otherwise provided for
    • B65D85/544—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles of special shape not otherwise provided for for gramophone records
    • B65D85/546—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles of special shape not otherwise provided for for gramophone records formed by folding a single blank

Definitions

  • the invention relates to a protective cover for a disk-shaped recording medium, in particular for a flexible data recording medium, consisting of a blank which has through openings and which is folded and the folded parts of which are connected to one another in a pocket-forming manner on at least two outer contour sides, so that one is open on at least one contour side Shell is formed.
  • Such protective sleeves for audio, video, data recording disks or disks or also for films, X-ray disks, etc. are generally designed as flat envelope-like sleeves.
  • the recording medium used in the respective recording medium which can be storable for magnetic, optical, etc. signals
  • efforts are made to keep the recording medium free from dirt and dust, etc., so as not to influence the reproduction of the recorded signals as far as possible.
  • the risk of dust etc. penetrating is even greater when the recording medium is removed from the casing, in comparison to a FlexyDisk®, in which the recording medium designed as a magnetic film is completely enclosed by the casing, with the exception of a few openings, and also during of the recording / playback process remains in the case.
  • FlexyDisk sleeves are manufactured, for example, as a cut from thin hard PVC film.
  • the blank which in the unfolded state is provided with a fleece on the later inside of the cover, is then punched out, folded into a cover and welded to the side flaps which protrude during folding.
  • the disk-shaped magnetic sheet coated with magnetic dispersion is inserted into the cover, which is still open on one side, and the end flap is folded and welded, and the magnetic sheet is thus protected on all sides.
  • This magnetic film is operated in a FlexyDisk drive for recording / reproducing signals inside the case.
  • a protective cover for a flexible data plate which consists of synthetic resin or hard paper.
  • Polycarbonate US Pat. No. 4,443,398
  • polyethylene terephthalate Japanese Patent Publication A 60124/76
  • thermoplastic sheet material US Pat. No. 3,317,038
  • a protective cover for a disk-shaped record carrier in particular for a flexible data record carrier, consisting of a blank which has through openings and which is folded and whose folded parts are connected to one another in a pocket-forming manner on at least two outer outline sides, so that one at most one Contour open shell is formed, when the material of the blank is made of paper or cardboard based on cellulose is provided with at least one coating and / or coating with chlorine-free plastic material that forms hydrophobic films.
  • a protective cover for a disk-shaped recording medium in particular for a flexible data recording medium, consisting of a blank which has through openings and which is folded and the folded parts of which are connected to one another in a pocket-forming manner on at least two outer contour sides, so that one At most one outline side open shell is formed if the material of the blank is made of paper or cardboard based on chlorine-free plastic fibers and the plastic fibers are connected or provided by means of chlorine-free plastic binders and / or coatings that have hydrophobic properties .
  • the object is also provided with a protective cover for a disk-shaped recording medium, in particular for a flexible data recording medium, consisting of a cut-out of the passage openings and which is folded and the folded parts of which are connected to one another in a pocket-forming manner on at least two outer contour sides, so that one on at most one contour side open shell is formed, solved if the material of the blank consists of paper-plastic composites, the plastic portion being chlorine-free.
  • the coating and / or the coating or the plastic content in paper-plastic composites should have a moisture resistance in the range of relative humidity of 3% to 90%. This ensures that, despite the use of paper or cardboard, the case does not ripple and does not lose its shape even under extreme moisture conditions and remains usable in the corresponding drives.
  • a protective cover according to the invention if it also has a temperature resistance of approximately -40 ° C. to approximately + 53 ° C., with a temperature change rate of less than or equal to 20 ° C. per hour.
  • the coating can be a dispersion coating, the dispersion of which occurs during the polymerization, in particular styrene-butadiene-acrylic acid or styrene-acrylic ester-acrylic acid.
  • the coating can advantageously also be a dispersion coating consisting of copolymers, e.g. from the group polyvinyl acetate, polyvinyl propionate, polyacrylic acid ester.
  • the plastic portion of the paper-plastic composites can expediently consist of polyethylene or polypropylene.
  • a water-soluble cobinder it is expedient in view of the hydrophobicity that formaldehyde resins of thio-urea, urea or melamine are used as curing agents.
  • a UV-curing paint job is very advantageous in order to provide particularly abrasion-resistant protective covers.
  • the protective cover 5 shown for a flexible magnetic plate consists essentially of a substantially rectangular blank 8 with punched circular and oval openings 6 and 7, which come to lie congruently on one another when folded along the fold line 9, and projecting fold edges after insertion of the magnetic foil 10 one of the cut halves can be glued or welded to the other cut half.
  • the cellulose-based papers or cardboards usually consist of a variety of different types of fiber materials, e.g. made from sulfite or sulfate pulp in bleached or unbleached condition, ground wood, thermomechanical fabric and chemo-thermomechanical fabric.
  • plastic fiber paper the cellulose is replaced by synthetic fibers, e.g. replaced by synthetic fibers made of viscose, polyamide and polyester.
  • Paper-plastic composite materials use paper types from thin paper to cardboard to heavy cardboard.
  • the paper content determines the required strength and rigidity as well as the folding and shaping behavior that is particularly important with FlexyDisk sleeves.
  • Fillers, binders and, if appropriate, auxiliaries are generally to be added as additives to the above-mentioned base materials for producing a protective cover.
  • the protective cover based on natural or artificial cellulose should be provided with a chlorine-free paint and / or coating.
  • the paints and coatings can be applied by brushing, extruder coating, dispersion coating, painting, laminating, printing, etc.
  • Paper is coated to remove surface roughness and pores. This means the application of a mixture of water or solvents, (white) pigments, binders and various auxiliaries on one or both sides. The result is an increase in smoothness, gloss, printability and water resistance.
  • Brushing is carried out using coating colors with a more or less high pigment content, with hydrophobic materials being preferred as pigments because of the desired high water resistance.
  • a sheet product for the production of blanks is conveniently and economically paintable, and the following advantages are obtained: gloss effect and protection against abrasion as well as special sliding properties and / or water-repellent effects through the use of special lacquers which form hydrophobic films, e.g. Polyacrylic esters. Solvent-free lacquers, which are liquid mixtures of monomers and oligomers and which polymerize and crosslink during the coating and drying process, can advantageously also be used to produce highly water-repellent films.
  • Acronals are polymers and copolymers based on acrylic esters, e.g. Styrene-acrylic ester-acrylic acid, the acrylic ester e.g. can be a 2-ethyl-hexyl acrylate or an n-butyl acrylate.
  • Acronal® and Styrofan® are registered trademarks of BASF Aktiengesellschaft.
  • Styrofans are polymers and copolymers based on styrene, such as Styrene-butadiene-acrylic acid, the acrylic acid being an example of a monoethylenically unsaturated carboxylic acid.
  • Vinyl acetate homopolymers and copolymers are also suitable as a further group of polymer dispersions.
  • Polymer dispersions based on methyl acrylic esters and copolymers of vinyl acetate and ethylene are also of importance.
  • low-viscosity aqueous dispersions must be mixed with hardening aids in order to obtain water-resistant dispersion layers on the protective cover.
  • the dispersion is e.g. applied in excess to the paper web with a roller, the excess removed with an air brush and the dispersion applied leveled. It is also advantageous to apply the layer in several coats in order to achieve a high level of tightness of the layer, as is necessary for hydrophobic film layers for the protective cover according to the invention.
  • copolymers for example polyvinyl acetate, polyvinyl propionate, polyacrylic acid esters, are generally very suitable for hydrophobic film production.
  • the protective cover can also be produced as "composite paper".
  • a paper web can be combined with one or more plastic films by lamination.
  • extruders polyethylene glue
  • roller coating units disersion or hot-melt glue
  • coating systems glue in organic solution, reaction glue
  • thermoplastic lamination dry lamination with reactive adhesives or solvent-free adhesive lamination should be used for paper to be laminated on both sides with foils.
  • Such composite foils can also be produced as triple or multiple composites from paper, plastic and aluminum foil (s).
  • thermoplasticity of the plastic layers or foils it is also possible, by utilizing the thermoplasticity of the plastic layers or foils, to completely surround the paper with plastic by sealing or welding, so that there is maximum tightness and high-density papers can thus be produced.
  • Polyethylene and polypropylene can advantageously be used as plastic materials for composite papers with regard to water vapor and moisture resistance.
  • the desired good level of water resistance can be achieved by using water-insoluble polymer dispersions. Since a water-soluble cobinder is usually used, which makes the coating water-sensitive to a certain extent, additional aids are required to harden the coating, which is essentially due to melamine, thiourea, urea-formaldehyde resins and bifunctional aldehydes such as glyoxal (for starchy lines) is achieved. For bars containing casein, Formal in can be added. In the case of high proportions of natural binders, about 10 to 15% hardener, based on the amount of binder, is added. In the case of single-coat binder coats or coats with only a very small proportion of cobinder, the amount is based on the pigment and then approx. 0.8 to 1% is used.
  • the temperature resistance from -40 ° C to about + 53 ° C or higher can be achieved at the same time.
  • Protective cover should also ensure good printability of the outer and, if applicable, inner surfaces.
  • Chromosulfate cardboard is an uncoated folding boxboard, usually consisting of four layers, made of sulfate pulp, ground wood and waste paper and combinations thereof.
  • Sleeves for FlexyDisks were made from materials I and II as well as standard cardboard materials (hereinafter referred to as "standard materials"), provided with a conventional cleaning fleece on the inside and into a closed FlexyDisk sleeve after inserting a flexible one Magnetic plate glued together.
  • the FlexyDisks were stored for 48 hours in a climate test between 5 ° C and 53 ° C at 80% relative humidity. All FlexyDisks were bulbous and wavy after the test, so that further tests could only be carried out by hand.
  • the drive torques required for the standard speed were measured via the current consumption of the drive motor.
  • the torque change was in the Materials I and II between 2% and 30% , in the Standard materials between 11% and 103% .
  • the failure rate for standard materials was therefore more than twice as high as for materials I and II.
  • open protective covers are provided on at most one side for each type of disc-shaped recording medium, which at least achieve the known protective covers in terms of appearance and handling, but are far more environmentally friendly than these.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Packaging For Recording Disks (AREA)
EP92113965A 1991-08-29 1992-08-17 Enveloppe protectrice pour un support d'enregistrement en forme de disque, notamment pour disques souples Withdrawn EP0530571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9110661U 1991-08-29
DE9110661U DE9110661U1 (de) 1991-08-29 1991-08-29 Schutzhülle für einen scheibenförmigen Aufzeichnungsträger, insbesondere für einen flexiblen Datenaufzeichnungsträger

Publications (1)

Publication Number Publication Date
EP0530571A1 true EP0530571A1 (fr) 1993-03-10

Family

ID=6870692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113965A Withdrawn EP0530571A1 (fr) 1991-08-29 1992-08-17 Enveloppe protectrice pour un support d'enregistrement en forme de disque, notamment pour disques souples

Country Status (3)

Country Link
EP (1) EP0530571A1 (fr)
JP (1) JPH05242628A (fr)
DE (1) DE9110661U1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040108088A (ko) * 2003-06-16 2004-12-23 주식회사 상보 벌크씨디 보관함

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001905A1 (fr) * 1979-12-26 1981-07-09 Minnesota Mining & Mfg Disquette d'enregistrement ayant un tissu de nettoiement a fibre floquee et son procede de fabrication
EP0133441A2 (fr) * 1983-07-23 1985-02-27 Firma Carl Freudenberg Enveloppe pour un support d'informations
EP0168523A1 (fr) * 1984-07-14 1986-01-22 Firma Carl Freudenberg Enveloppe complète pour un disque souple
EP0280092A2 (fr) * 1987-02-21 1988-08-31 Ludwig Fr. Noltemeyer GmbH Pochette pour disque ouverte sur un côté
US4774272A (en) * 1986-08-08 1988-09-27 Minnesota Mining And Manufacturing Company Composite sheet material for storage envelopes for magnetic recording media

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001905A1 (fr) * 1979-12-26 1981-07-09 Minnesota Mining & Mfg Disquette d'enregistrement ayant un tissu de nettoiement a fibre floquee et son procede de fabrication
EP0133441A2 (fr) * 1983-07-23 1985-02-27 Firma Carl Freudenberg Enveloppe pour un support d'informations
EP0168523A1 (fr) * 1984-07-14 1986-01-22 Firma Carl Freudenberg Enveloppe complète pour un disque souple
US4774272A (en) * 1986-08-08 1988-09-27 Minnesota Mining And Manufacturing Company Composite sheet material for storage envelopes for magnetic recording media
EP0280092A2 (fr) * 1987-02-21 1988-08-31 Ludwig Fr. Noltemeyer GmbH Pochette pour disque ouverte sur un côté

Also Published As

Publication number Publication date
DE9110661U1 (de) 1991-10-17
JPH05242628A (ja) 1993-09-21

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