WO2007144716A1 - Article en plastique muni d'une surface antidérapante et processus pour sa production - Google Patents

Article en plastique muni d'une surface antidérapante et processus pour sa production Download PDF

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Publication number
WO2007144716A1
WO2007144716A1 PCT/IB2007/001480 IB2007001480W WO2007144716A1 WO 2007144716 A1 WO2007144716 A1 WO 2007144716A1 IB 2007001480 W IB2007001480 W IB 2007001480W WO 2007144716 A1 WO2007144716 A1 WO 2007144716A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic article
slip resistant
separately formed
injection
moulded plastic
Prior art date
Application number
PCT/IB2007/001480
Other languages
English (en)
Inventor
Charles Thomas Retief
Original Assignee
Charles Thomas Retief
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 Charles Thomas Retief filed Critical Charles Thomas Retief
Publication of WO2007144716A1 publication Critical patent/WO2007144716A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B31/00—Service or tea tables, trolleys, or wagons
    • A47B31/06—Service or tea tables, trolleys, or wagons adapted to the use in vehicles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G23/00—Other table equipment
    • A47G23/06—Serving trays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14795—Porous or permeable material, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2621/00—Use of unspecified rubbers for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/732—Floor coverings
    • B29L2031/7324—Mats

Definitions

  • This invention relates to a plastic article that has extending over at least a part of its exposed surface area, a slip resistant surface that is aimed at substantially preventing, or at least inhibiting, slippage between that surface and another surface that is in engagement with it. More particularly, the invention relates to a process for the production of such a plastic article.
  • thermoplastic materials such as polypropylene, polyethylene and in particular high density polyethylene, polymethylmethacrylate (also often referred to as Plexi-glass or Perspex), generally do not of themselves have a slip resistant nature.
  • a slip resistant surface is desirable and, indeed, a slip resistant surface is often provided on a plastic article by laminating a slip resistant layer onto relevant areas of the plastic surface.
  • the surface of the functional tray on which articles are supported is often made of a layer of material bonded to the plastics material in order to provide suitable slip resistant characteristics.
  • a layer may be made of rubber or some other suitable elastomer, cork, and other types of natural or synthetic material.
  • the application of such a layer to a moulded plastic article is costly both as regards material and labour. Furthermore, there is no guarantee that the bond will be totally effective or that it will be adequately durable.
  • an injection moulded plastic article having at least a part of its surface area formed as a slip resistant surface characterized in that the slip resistant surface is defined by a multitude of surface zones of one or more separately formed elements over which the plastic article has been moulded to lock the elements to the moulded plastic article and wherein said multitude of surface zones stands proud of the adjacent surface of the injection moulded plastic article itself.
  • the said surface zones of the separately formed elements to be of an elastomeric slip resistant material that may be either thermoplastic or thermoset; for the one or more separately formed elements to be defined by a slip resistant mesh that is made of optionally fibre based slip resistant material, typically, but not necessarily, an elastomeric material such as a suitable polyurethane; for the injection moulded plastic article to be made of a polypropylene, polyethylene in particular high density polyethylene, polymethylmethacrylate, polyamide, acrylonitrile butadiene styrene (ABS) or other suitable material; and for the plastic article to be selected from a tray wherein at least a major portion of a functional support surface thereof is a slip resistant surface according to the invention, and a free standing article having support surface engaging formations or feet having a slip resistant surface according to the invention.
  • a slip resistant mesh that is made of optionally fibre based slip resistant material, typically, but not necessarily, an elastomeric material such as a suitable polyurethane
  • a process for the production of an injection moulded plastic article comprising the steps of positioning one or more separately formed elements that have a slip resistant outer surface in contact with a part of the surface of an injection moulding die that corresponds to a slip resistant part of the surface area of a plastic article to be moulded in the injection mould, and then injection moulding a plastic article in the injection die, the process being characterised in that the material from which the said one or more separately formed elements is made and the plastic material being moulded are selected such that, after de-moulding the formed plastic article, post moulding expansion of the separately formed elements or post moulding shrinkage of the moulded plastic material, or both, cause surface zones of the separately formed elements to stand proud of the adjacent surface of the moulded plastic article.
  • Figure 1 is an isometric view of a serving tray according to the invention
  • Figure 2 is a similar view of a pre-cut, separately formed mesh element of the serving tray illustrated in Figure 1 ;
  • Figure 3 is a section through a part of the tray having the resultant slip resistant surface in the form in which the tray emerges from the injection die;
  • Figure 4 is a section similar to Figure 3 but showing the same part of the tray after completion of any post moulding expansion of the separately formed mesh element and after the inherent post moulding shrinkage of the moulded plastic material has taken place;
  • Figure 5 is an underneath isometric view of a book end illustrating the application of the invention to a surface of an article that is to stand upon a support surface for the book end in slip resistant manner;
  • Figure 6 is a schematic isometric view of the application of the invention to a fold of a foldaway aircraft tray.
  • Figure 7 is a schematic isometric view of a mat or tile made according to the invention and having numerous different forms and applications.
  • the support surface (2) is to be rendered slip resistant in terms of this invention, and with this end in view, a separately formed element in the form of a polyurethane coated fibrous mesh (3) that is die-cut to the required shape is provided.
  • the mesh material may conveniently be that which is available commercially under the trademark "BOOTGRIP" from Impregnated Web Technology (Pty) Ltd in South Africa and that is typically used as a slip resistant underlay for carpets and floor mats.
  • This mesh material comprises strands extending at right angles to each other and spaced about 5 millimetres apart with the strands being coated in polyurethane.
  • This pre-cut, separately formed element is inserted into the die by manual or robotic means and held in place by vacuum, static charge, or, when the surface finish is not too critical, an adhesive or sticky gum, so as to be located over the area of the injection moulding die that is to form the slip resistant surface on the relevant plastic article.
  • the injection-moulding machine is operated in the normal way to form the injection moulded article.
  • the pressure and flow of the molten plastic material may be arranged to force the separately formed element against the mould surface opposite the flow direction of the mould's gate (injection point).
  • the plastic article is ejected or removed by conventional means.
  • the plastic material being moulded is a suitable grade of polypropylene and it has been found that, after de-moulding the formed plastic article, post moulding shrinkage of the moulded plastic, possibly in combination with a post moulding expansion of the separately formed element, causes surface zones (4) of the strands (5) of the separately formed element to stand proud of the adjacent surface (6) of the moulded plastic tray.
  • the separately formed element will have already passed through any post moulding shrinkage phase in its production prior to introduction into the mould for the purpose of the present invention. Accordingly, it will not generally exhibit any post moulding shrinkage as will be the case with the moulded plastic material, in this instance polypropylene. It is therefore suggested that the post moulding shrinkage of the plastic material that is, in effect, acting as a matrix, squeezes the separately formed element and causes the said surface zones to bulge outwards from the adjacent plastic surface. It is also suggested that, possibly to a lesser degree, the thermoplastic material will shrink away from the surface height of the separately formed element.
  • the separately formed element particularly in the event that it is formed as elastomer coated fibre strands, may have voids or pockets of air or other gas entrained therein in which instance the separately formed element will become compressed during the moulding procedure and will, after de-moulding, therefore expand and likewise cause bulging of the said surface zones to stand proud of the adjacent plastic surface.
  • the molten thermoplastic material being injected into the injection die may, in some instances, bond to the slip resistant surface of the separately formed element or, alternatively, the thermoplastic material may simply physically embrace a major part of the shape of the separately formed element, in the case of elongate strands or other elements the cross-sectional shape, to mechanically lock it to the surface region of the moulded plastic material.
  • the resultant tray has a highly effective slip resistant surface that, it is envisaged, will be more economical to produce than the prior art plastic articles described above and it is anticipated that such a plastic article will also have excellent durability.
  • the results can be varied by controlling injection pressure.
  • the choice of material may have an effect due to the different rates and extents of shrinkage of different materials.
  • An example is that of ABS (acrylonitrile butadiene styrene) is generally associated with shrinkage of approximately 0.5% as opposed to polypropylene with which a shrinkage of approximately 2.0% is generally associated.
  • the polypropylene is expected, because it shrinks more, to cause the elastomer of the separately formed element to protrude more.
  • Many variations of the two polymers can be used to achieve various desired results.
  • a strength requirement for example for a motor vehicle rear parcel tray, may require that the moulded thermoplastic be a polyamide, also known as nylon.
  • Another requirement could be that of aesthetics in which instance materials such as polymethylmethacrylate (Plexiglas or Perspex) could be the thermoplastic material being moulded.
  • An example may be a coin tray in a motor vehicle.
  • a further usage for the slip resistant surface of the invention is to create such a slip resistant surface under the four corners or feet of a plastic crate or any other injection-moulded product that may require anti slip properties top or bottom, inside or out.
  • a slip resistant surface (7) may be moulded into the undersurface of a bookend (8) to inhibit slipping thereof on a surface on which a pair of bookends and interposed books are supported.
  • the tray or other product produced according to this invention may be strong, of light weight, and therefore cost effective when compared to a bonded laminated option. It offers superior slip resistant qualities when compared to any standard serving tray and is ideally suited for the catering and other industries where a slip resistant property is a distinct advantage.
  • aircraft foldaway table trays 9 illustrated schematically in Figure 6, car parcel shelves, tool trolley trays, workbench surfaces, cupboard shelves, under computer keyboards and mouse pads, vehicle coinage trays, medical instrument trays, desktop calendars and other free standing accessories.
  • use of the invention may obviate the necessity for providing the usual recess (10) indicated in dotted lines in Figure 6 for a cup or drinking glass.
  • FIG. 7 Another broad application of the invention that is illustrated schematically in Figure 7, is to a mat or tile (11) that could assume numerous different forms, peripheral shapes and sizes with applications ranging from removable slip resistant floormats to table mats and other covers for work areas or surfaces either a floor level or elevated. It is also possible that, for the purpose of loose lay mats, a part of an opposite surface may also be provided with slip resistant elements, as indicated by numeral (12).
  • the invention therefore provides an extremely useful plastic article having a slip resistant surface and a method of producing such an article.
  • the invention is in no way limited to the example described above.
  • the separately formed element may be provided in various configurations and may contain a logo or other advertising material embedded therein.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un article (1, 8) en plastique moulé par injection dont au moins une partie de l'aire de surface est formée comme une surface antidérapante (2, 7). La surface antidérapante est définie par une multitude de zones de surface d'un ou plusieurs éléments (3, 5) formés séparément par-dessus lesquels l'article en plastique a été moulé afin de solidariser les éléments à l'article en plastique moulé de telle sorte que ladite multitude de zones (4) de surface saille de la surface (6) adjacente de l'article en plastique moulé par injection lui-même. Les zones de surface sont de préférence constituées d'élastomère, typiquement du polyuréthane, et la multitude de zones de surface peut être associée à un treillis antidérapant (3) moulé dans la surface de l'article. L'invention concerne également un processus de production d'articles en plastique moulé selon l'invention.
PCT/IB2007/001480 2006-06-15 2007-06-05 Article en plastique muni d'une surface antidérapante et processus pour sa production WO2007144716A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200604948 2006-06-15
ZA2006/04948 2006-06-15

Publications (1)

Publication Number Publication Date
WO2007144716A1 true WO2007144716A1 (fr) 2007-12-21

Family

ID=38613245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/001480 WO2007144716A1 (fr) 2006-06-15 2007-06-05 Article en plastique muni d'une surface antidérapante et processus pour sa production

Country Status (2)

Country Link
WO (1) WO2007144716A1 (fr)
ZA (1) ZA200810086B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3091812A1 (fr) * 2019-01-22 2020-07-24 Cyril CLEMENT Plateau de service et son procédé d’utilisation
WO2020152419A1 (fr) * 2019-01-22 2020-07-30 Clement Cyril Plateau de service et son procédé d'utilisation
US20210330108A1 (en) * 2016-05-12 2021-10-28 Cambro Manufacturing Company Methods for Manufacturing Serving Tray with Inner Raised Surface Incorporating Thermoplastic Polyurethane

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505409A1 (de) * 1985-02-16 1986-08-21 Bayerische Motoren Werke AG, 8000 München Rutschsichere ablageflaeche
JPH0457744A (ja) * 1990-06-22 1992-02-25 Tokai Jiyuken Kogyo Kk 滑り止めを形成した樹脂製パレット及びその製造方法
EP0637494A1 (fr) * 1993-07-05 1995-02-08 Teresa Bouldstridge Balari Procédé pour fabriquer des objets en matière plastique munis de surfaces antidérapantes et plateau antidérapant
US20040144683A1 (en) * 2003-01-27 2004-07-29 Tin-Chou Wang Serving tray

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505409A1 (de) * 1985-02-16 1986-08-21 Bayerische Motoren Werke AG, 8000 München Rutschsichere ablageflaeche
JPH0457744A (ja) * 1990-06-22 1992-02-25 Tokai Jiyuken Kogyo Kk 滑り止めを形成した樹脂製パレット及びその製造方法
EP0637494A1 (fr) * 1993-07-05 1995-02-08 Teresa Bouldstridge Balari Procédé pour fabriquer des objets en matière plastique munis de surfaces antidérapantes et plateau antidérapant
US20040144683A1 (en) * 2003-01-27 2004-07-29 Tin-Chou Wang Serving tray

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210330108A1 (en) * 2016-05-12 2021-10-28 Cambro Manufacturing Company Methods for Manufacturing Serving Tray with Inner Raised Surface Incorporating Thermoplastic Polyurethane
US11980307B2 (en) * 2016-05-12 2024-05-14 Cambro Manufacturing Company Methods for manufacturing serving tray with inner raised surface incorporating thermoplastic polyurethane
FR3091812A1 (fr) * 2019-01-22 2020-07-24 Cyril CLEMENT Plateau de service et son procédé d’utilisation
WO2020152419A1 (fr) * 2019-01-22 2020-07-30 Clement Cyril Plateau de service et son procédé d'utilisation

Also Published As

Publication number Publication date
ZA200810086B (en) 2009-12-30

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