WO1990001249A1 - Panneau de deflexion de l'electricite statique et structure de base correspondante - Google Patents

Panneau de deflexion de l'electricite statique et structure de base correspondante Download PDF

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Publication number
WO1990001249A1
WO1990001249A1 PCT/SE1989/000386 SE8900386W WO9001249A1 WO 1990001249 A1 WO1990001249 A1 WO 1990001249A1 SE 8900386 W SE8900386 W SE 8900386W WO 9001249 A1 WO9001249 A1 WO 9001249A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
base structure
agents
static electricity
fibres
Prior art date
Application number
PCT/SE1989/000386
Other languages
English (en)
Inventor
Steinar Nordholm
Ingemar Norlin
Original Assignee
Alstermo Bruk Aktiebolag
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 Alstermo Bruk Aktiebolag filed Critical Alstermo Bruk Aktiebolag
Publication of WO1990001249A1 publication Critical patent/WO1990001249A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections
    • H05F3/025—Floors or floor coverings specially adapted for discharging static charges

Definitions

  • the present invention relates to a dissipation panel, especially for use as a floor for dissipation of static electricity.
  • ESD Electrostatic discharge
  • Electronic components are differently susceptible to electrostatic discharge, the highly susceptible ones being liable to be knocked out as early as at a voltage of a few dozen volts.
  • Static electricity of up to 10 kV can be generated in a few seconds when a person walks on an ordinary floor covering. Static, electricity is liable to erase memories, distort data, damage sensitive components or produce la- tent defects which do not immediately appear, but which may eventually result in a malfunction of the components. Moreover, these defects are usually very difficult to de ⁇ tect.
  • the floor covering should produce a uniform dissipa ⁇ tion across its entire surface and be time-invariant.
  • the floor should also be easy to lay, as well as easily adaptable to different types of substrates. It must function also on uneven substrates, and on conductive as well as insulating substrates.
  • the mass of plastic or rubber also has a tendency to function as an insulating cover.
  • One object of the present invention is to provide a panel dissipating static electricity, which is especially intended to be used as a floor covering, but which may also serve as a table top or the like.
  • Another object of the invention is to provide a panel dissipating static electricity, which has a satisfactory and uniform dissipation of static electricity, irrespec- tive of the substrate, the time, and the surroundings.
  • a further object of the invention is to provide a base structure intended to form a part of a panel, or to be used separately for dissipation of static electricity.
  • the panel according to the invention can have any shape or size.
  • a number of small panels can together form a continuous floor covering, or the floor covering can be in the form of a single panel.
  • the panel can be delivered in rolled-up condition.
  • the panel according to the invention comprises a se- miconductive surface coating of a known type, suitably a plastic coating in which carbon particles have been dis ⁇ persed, and a base structure including natural fibres, such as cellulose, mineral fibres, for example glass fibres or mineral wool fibres, pulverised carbon, such as carbon black, and one or more minerals, for instance kao ⁇ lin, bentonite, talc or silicon.
  • natural fibres such as cellulose, mineral fibres, for example glass fibres or mineral wool fibres
  • pulverised carbon such as carbon black
  • minerals for instance kao ⁇ lin, bentonite, talc or silicon.
  • the base structure may also comprise different addi ⁇ tives, such as flocculating agents, surface-treating agents, and pH-adjusting agents, all well known in the art.
  • Suitable proportions of the included materials in percent by weight of the total mixture are as follows:
  • the conductive base structure is joined with a semi- conductive surface coating of a known type, either by glu ⁇ ing or by being placed loosely against said coating.
  • the composition of the base structure according to the invention can be varied, in order to render the mate ⁇ rial more or less pliant, depending on its application. If the substrate is very uneven, more clay mineral is ad ⁇ mixed, so that the base structure more easily conforms to the s ⁇ bstrate.
  • a cellulose fibre In humid surroundings, a cellulose fibre normally ab ⁇ sorbs moisture and expands, while it shrinks when dried up. This creates undesired stresses in the material, a problem which we have succeeded in minimising by the pre- sent composition.
  • the mineral fibres form a network enabl ⁇ ing the cellulose to expand.
  • An addition of bentonite fur ⁇ ther strengthens the stability of the base structure. The bentonite, which easily absorbs water during the mixing step, imparts to the base structure a certain porosity after drying so that moisture can be absorbed without the base structure changing its shape.
  • the base structure can be manufactured in any shape: as a continuous floor covering, a floor covering on a roll, or as smaller square-shaped panels.
  • the base structure according to the invention is schematically produced as follows:
  • the ingredients are step by step mixed with water, the pH-value of the mixture being regularly adjusted. Subsequently, the mixture is conducted to a perforated cylinder for dehydration and from there, via a take-up roll, to a press and an oven.
  • Example 1 This Example describes the manufacture of a base structure having a preferred composition. 65%
  • the mixture is pumped to a vat, where the con ⁇ ductive carbon particles, and thereafter the surface- treating agents and the surface-active agents, are added.
  • the stock is screened, whereupon the mixture is diluted and pumped to the board machine.
  • the pH-value of the material is adjusted to 4.2-4.5, whereupon addi ⁇ tional surface-active agents and surface-treating agents are added.
  • the diluted stock which has a dry solids content of 0.3-0.7% by weight is put on a ro ⁇ tating perforated cylinder, whereupon the mixture is car ⁇ ried to a take-up roll via a continuous conveyor. During the transport, the water content of the mixture is adjust ⁇ ed to 60-80% by means of vacuum suction.
  • the wet sheet is rolled up on a cylinder and automa ⁇ tically cut when the right thickness has been achieved.
  • the wet sheet is thereafter brought to a flat press where its water content is reduced to about 50%, and the gram age of the sheet is adjusted.
  • the sheet is then dried in a continuous hot-air oven.
  • the floor panel (B) comprises a 2.5 mm thick surface coating of vinyl mixed with pulverised carbon, and a 1 mm thick base structure according to Example 1, glued to said coating.
  • the two floor panels were tested on an insulating substrate. The test person walked on the floor panel both at a normal walking pace and with a shuffling gait, and wore soles made of different materials, i.e. conductive rubber, leather or PVC. The tests were made at room temperature, the air having an average moisture content of 25%. The results are apparent from Table 1.
  • a conventional antistatic floor panel (II) was com ⁇ pared with a floor panel (I) according to the invention.
  • the panel according to the invention is in particular intended to serve as a floor or floor covering, but may as well be used as a table top, a chair cover or suchlike, i.e. every type of surface or covering where one wishes to 35 avoid static electricity.

Abstract

La présente invention se rapporte à un panneau servant à la dissipation de l'électricité statique, destiné en particulier à être utilisé comme revêtement de sol. Ledit panneau comprend un revêtement de surface d'un type connu, ainsi qu'une structure de base contenant essentiellement des fibres naturelles, des fibres minérales, du carbone pulvérisé, un ou plusieurs minéraux et des additifs. La présente invention décrit également une structure de base destinée à faire partie dudit panneau ou à être utilisée séparément pour la dissipation de l'électricité statique.
PCT/SE1989/000386 1988-07-18 1989-07-05 Panneau de deflexion de l'electricite statique et structure de base correspondante WO1990001249A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8802658A SE461627B (sv) 1988-07-18 1988-07-18 Platta foer avledning av statisk elektricitet
SE8802658-8 1988-07-18

Publications (1)

Publication Number Publication Date
WO1990001249A1 true WO1990001249A1 (fr) 1990-02-08

Family

ID=20372927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000386 WO1990001249A1 (fr) 1988-07-18 1989-07-05 Panneau de deflexion de l'electricite statique et structure de base correspondante

Country Status (3)

Country Link
AU (1) AU3978489A (fr)
SE (1) SE461627B (fr)
WO (1) WO1990001249A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213965A (en) * 1990-07-16 1993-05-25 Cholestech Corporation Solid-phase precipitation assay device
US8507102B1 (en) 2012-08-07 2013-08-13 Fownes Brothers & Co., Inc. Conductive leather materials and methods for making the same
US10221519B2 (en) 2014-12-10 2019-03-05 Fownes Brothers & Co., Inc. Water-repellant conductive fabrics and methods for making the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540624A (en) * 1984-04-09 1985-09-10 Westinghouse Electric Corp. Antistatic laminates containing long carbon fibers
US4724187A (en) * 1986-03-25 1988-02-09 Nevamar Corporation Conductive laminate flooring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540624A (en) * 1984-04-09 1985-09-10 Westinghouse Electric Corp. Antistatic laminates containing long carbon fibers
US4724187A (en) * 1986-03-25 1988-02-09 Nevamar Corporation Conductive laminate flooring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213965A (en) * 1990-07-16 1993-05-25 Cholestech Corporation Solid-phase precipitation assay device
US8507102B1 (en) 2012-08-07 2013-08-13 Fownes Brothers & Co., Inc. Conductive leather materials and methods for making the same
US9963752B2 (en) 2012-08-07 2018-05-08 Fownes Brothers & Co., Inc. Conductive leather materials and methods for making the same
US10221519B2 (en) 2014-12-10 2019-03-05 Fownes Brothers & Co., Inc. Water-repellant conductive fabrics and methods for making the same

Also Published As

Publication number Publication date
AU3978489A (en) 1990-02-19
SE8802658L (sv) 1990-01-19
SE461627B (sv) 1990-03-05
SE8802658D0 (sv) 1988-07-18

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