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WO1997046370A1 - Feuille acrylique - Google Patents

Feuille acrylique Download PDF

Info

Publication number
WO1997046370A1
WO1997046370A1 PCT/GB1997/001506 GB9701506W WO9746370A1 WO 1997046370 A1 WO1997046370 A1 WO 1997046370A1 GB 9701506 W GB9701506 W GB 9701506W WO 9746370 A1 WO9746370 A1 WO 9746370A1
Authority
WO
WIPO (PCT)
Prior art keywords
strips
acrylic sheet
acrylic
sheet
width
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.)
Ceased
Application number
PCT/GB1997/001506
Other languages
English (en)
Inventor
Gordon Maxwell Beverly
Derek John Irvine
John Patrick Lynch
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to AU29732/97A priority Critical patent/AU2973297A/en
Publication of WO1997046370A1 publication Critical patent/WO1997046370A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0017—Plate-like elements

Definitions

  • the present invention relates to acrylic sheet
  • Acrylic sheet for example cast or extruded poly(methyl methacrylate), can be used in a wide range of applications In particular it has utility as a noise protection screen for use in locations such as alongside motorways as described in EP-B-0600332 When so used it is likely to be subjected to impact from vehicles and other objects
  • acrylic sheet is durable and is resistant to environmental attack, it is also relatively brittle, particularly at low temperatures, and when subjected to impact tends to shatter When shattered, parts of the acrylic sheet can be projected into the path of other vehicles or, if positioned on a bridge or fly-over, onto vehicles passing below Attempts to reduce the danger from the shattering of the acrylic sheet are described in EP-B-0407852 and EP-B-0559075
  • EP-B-0407852 describes the embedding of plastic monofilaments into an acrylic sheet
  • the plastic monofilaments are of a polyamide which is specifically chosen because o ⁇ its low adhesion to the acrylic sheet Consequently, on impact the monofilaments do not tear or break but stretch It is therefore evident that not only is the sizing of the monofilaments critical but also their chemical composition
  • EP-B-0559075 describes the use of embedded spirals of steel wire as an improvement over the use of polyamide monofilaments During fabrication care must be taken to keep the core of the wire spirals free from the material forming the acrylic sheet Additionally, when used in damp climates special care must be taken to prevent corrosion of the wire spirals by for example filing the core with a hydrophobic fluid
  • the present invention provides an improvement in acrylic sheet which is suitable for noise protection screening and which is not dependent on the ability of the embedded material to stretch Furthermore, relatively inexpensive and readily available materials can be used
  • the present invention provides an acrylic sheet having an obverse side and a reverse side and being suitable for use as a noise protection screen comprising
  • the acrylic sheet may be of suitable dimensions for its intended purpose Conventionally, for noise protection, the acrylic sheet preferably has a thickness of at least 10 mm and more preferably in the range from 10 to 20 mm, for example 15 mm
  • the acrylic sheet is generally planar However, other geometries are possible, e g curved Typically, the acrylic sheet will be about 1 m by 2 m in extent
  • the acrylic polymer matrix may be a homopolymer of a (meth)acrylate or a copolymer of one or more (meth)acrylates
  • the acrylic polymer is preferably a homopolymer of methyl methacrylate
  • the acrylic polymer is preferably a copolymer of methyl methacrylate and a lower alkyl acrylate, e g ethyl acrylate
  • each strip is positioned substantially parallel to the obverse and/or reverse sides of the acrylic sheet This is required because the mechanism through which the strips retain the fragments of the acrylic sheet after impact is believed to be different from that employed using the monofilaments previously described In the present invention movement of the strips within the channels formed by their embedment is not usually seen Rather, the energy of the impact causes fibrillation of the strip into fine fibrils which remain intact along their length and able to retain the fragments of the acrylic matrix in which they are embedded If the strips are embedded with the broad face perpendicular to the obverse and/or reverse sides then the tendency is for the acrylic sheet to be weakened such that on impact the acrylic sheet fractures along the length of the strip
  • each strip is capable of being fibrilated then a partial tear across the width of a strip, as might occur due to contact with the sharp edges of the fragments of the acrylic matrix formed on impact, does not result in complete failure of the strip It has been observed that such a tear is halted during propagation and for it then to proceed to cause further fibrillation along the length of the strip
  • the strips may be formed from any suitable plastics material
  • the strips are of a polyolefin, in particular polypropylene, or a polyester, in particular polyethylene terephthalate (PET)
  • PET polyethylene terephthalate
  • Particularly preferred is the use of strips formed from PET
  • PET having a melt viscosity in the range 390 to 660 Pa s at 295°C such as Melinar XP1663 and Melinar B95A PET obtainable from Imperial Chemical Industries pic
  • the strips when subjected to a tensile stress, show an elongation at break, expressed as a percentage of the initial length, in the range of 20 to 70 %, particularly in the range of 15 to 35 % and especially in the range of 15 to 25 %
  • the strips have a width in the range from 0 8 to 3 0 cm, preferably from 1 0 to 2 0 cm
  • such strips have a thickness which is less than a quarter of the width and preferably in the range from a tenth to a twentieth of the width
  • the strips are preferably positioned about midway between the obverse and reverse sides, although other positions are possible
  • the number of strips used will of course depend on the relative dimensions of the strips and the acrylic sheet It has been observed that gaps in the range from 2 cm to 15 cm, preferably in the range from 2 cm to 9 cm and particularly in the range from 5 cm to 9 cm, can be successfully employed between the strips
  • a preferred combination of the size of strip width and gap between strips is a width of about 1 6 cm and a gap in the range from 5 0 cm to 8 5 cm, in particular 5 0 cm to 6 0 cm
  • the strips may be positioned such that in use they appear in any desirable orientation, e g horizontal or vertical, relative to the ground Preferably the strips are positioned such that in use they are in a vertical position relative to the ground If required, additional strips may be used such that a grid pattern is formed
  • the strips may be made capable of being fibnllated by a number of techniques
  • the strip may be formed from a tape of a plastics material then during fabrication lines of weakness can be embossed on or introduced into the broad face of the strip so as to run along the length of the strip
  • the strip may be formed from a series of separable elements Suitable material from which to form the strip is heavy duty polypropylene and polyethylene terephthalate packaging tape obtainable from Strapex Ltd
  • an acrylic sheet of the present invention is suitable for use as a noise protection screen
  • noise protection screens are described in EP-B-0600332 and comprise a support and an acrylic sheet
  • a test piece of acrylic sheet having dimensions 1 14 m by 0 64 m by 15 mm was fabricated from cast polymethyl methacrylate as the matrix of acrylic polymer in which were embedded strips of extruded polypropylene tape Whilst being supported at four points approximately 45 cm from the ground the acrylic sheet was subjected to an impact from a 3 5 kg ball being dropped from a height of 8 m Although the acrylic matrix shattered and the strips were fibrilated, the fragments of the acrylic matrix were retained by the fibrils Example 2
  • PE polyethylene terephthalate strip formed from Melinar PET obtainable from Imperial Chemical Industries pic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne une feuille acrylique ayant un endroit et un envers et pouvant être utilisée efficacement comme écran antibruit. La feuille acrylique comprend une matrice d'un polymère acrylique et plusieurs bandes d'un matériau en plastique noyées dans la matrice acrylique et pouvant être fibrillées dans le sens longitudinal. Les bandes retiennent facilement des fragments de la matrice acrylique après un impact et permettent donc une utilisation de la feuille acrylique comme écran antibruit le long des autoroutes et dans des endroits similaires.
PCT/GB1997/001506 1996-06-07 1997-06-04 Feuille acrylique Ceased WO1997046370A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29732/97A AU2973297A (en) 1996-06-07 1997-06-04 Acrylic sheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9611920.1 1996-06-07
GBGB9611920.1A GB9611920D0 (en) 1996-06-07 1996-06-07 Acrylic sheet

Publications (1)

Publication Number Publication Date
WO1997046370A1 true WO1997046370A1 (fr) 1997-12-11

Family

ID=10794902

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001506 Ceased WO1997046370A1 (fr) 1996-06-07 1997-06-04 Feuille acrylique

Country Status (4)

Country Link
AU (1) AU2973297A (fr)
GB (1) GB9611920D0 (fr)
TW (1) TW347367B (fr)
WO (1) WO1997046370A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000020690A1 (fr) * 1998-10-06 2000-04-13 Röhm Gesellschaft Mit Beschränkter Haftung Panneau utilise comme paroi antibruit
EP1029984A1 (fr) * 1999-02-19 2000-08-23 Röhm Gesellschaft mit beschränkter Haftung Elément de mur anti-bruit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485912A (en) * 1965-02-09 1969-12-23 Dow Chemical Co Composite article formation
DE2058571A1 (de) * 1970-11-03 1972-06-15 Toray Industries Synthetische Folie aus einer Vielzahl Kernkomponenten in einer Einbettkomponente und Verfahren sowie Vorrichtung zur Herstellung derselben
EP0407852A2 (fr) * 1989-07-13 1991-01-16 Degussa Aktiengesellschaft Plaques de verre acrylique convenant comme éléments d'écran antibruit
WO1991015355A1 (fr) * 1990-03-30 1991-10-17 Minnesota Mining And Manufacturing Company Materiaux composites et procede relatif a ceux-ci
EP0621374A1 (fr) * 1993-04-20 1994-10-26 Röhm GmbH Mur anti-bruit en acryl résistant à la flamme
EP0641639A1 (fr) * 1993-08-05 1995-03-08 Röhm Gmbh Composite fabriqué à partir de matières plastiques incompatibles
JPH07314523A (ja) * 1994-05-27 1995-12-05 Mitsubishi Rayon Co Ltd 複合樹脂シート、その製造方法及び装置
EP0769595A1 (fr) * 1995-10-21 1997-04-23 Degussa Aktiengesellschaft Panneau transparent anti-feu et procédé d'utilisation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485912A (en) * 1965-02-09 1969-12-23 Dow Chemical Co Composite article formation
DE2058571A1 (de) * 1970-11-03 1972-06-15 Toray Industries Synthetische Folie aus einer Vielzahl Kernkomponenten in einer Einbettkomponente und Verfahren sowie Vorrichtung zur Herstellung derselben
EP0407852A2 (fr) * 1989-07-13 1991-01-16 Degussa Aktiengesellschaft Plaques de verre acrylique convenant comme éléments d'écran antibruit
WO1991015355A1 (fr) * 1990-03-30 1991-10-17 Minnesota Mining And Manufacturing Company Materiaux composites et procede relatif a ceux-ci
EP0621374A1 (fr) * 1993-04-20 1994-10-26 Röhm GmbH Mur anti-bruit en acryl résistant à la flamme
EP0641639A1 (fr) * 1993-08-05 1995-03-08 Röhm Gmbh Composite fabriqué à partir de matières plastiques incompatibles
JPH07314523A (ja) * 1994-05-27 1995-12-05 Mitsubishi Rayon Co Ltd 複合樹脂シート、その製造方法及び装置
EP0769595A1 (fr) * 1995-10-21 1997-04-23 Degussa Aktiengesellschaft Panneau transparent anti-feu et procédé d'utilisation

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 9606, Derwent World Patents Index; AN 96-054695, XP002040063 *
HELGA MÜLLER UND DIETER MÜLLER: "DURCHSICHTIGE LARMSCHUTZWANDE", DEUTSCHE BAUZEITSCHRIFT - DBZ, vol. 37, no. 11, 1 November 1989 (1989-11-01), GUTERSLOH, pages 1509 - 1512, XP000086813 *
KLAUS KERK UND JÜRGEN JOURDAN: "EINE NEUE PRODUKTALTERNATIVE FÜR TRANSPARENTE LARMSCHUTZWÄNDE", BMK BAUEN MIT KUNSTSTOFFEN UND NEUEN BAUSTOFFEN, no. 6, 1 November 1994 (1994-11-01), DARMSTADT, pages 24 - 26, XP000480942 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000020690A1 (fr) * 1998-10-06 2000-04-13 Röhm Gesellschaft Mit Beschränkter Haftung Panneau utilise comme paroi antibruit
EP1029984A1 (fr) * 1999-02-19 2000-08-23 Röhm Gesellschaft mit beschränkter Haftung Elément de mur anti-bruit
US6305492B1 (en) 1999-02-19 2001-10-23 Rohm Gesellschaft Mit Beschrankter Haftung Noise-protection wall-segment

Also Published As

Publication number Publication date
AU2973297A (en) 1998-01-05
GB9611920D0 (en) 1996-08-07
TW347367B (en) 1998-12-11

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