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WO1994001267A1 - Application de revetements de surface sur des articles moules - Google Patents

Application de revetements de surface sur des articles moules Download PDF

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Publication number
WO1994001267A1
WO1994001267A1 PCT/GB1993/001408 GB9301408W WO9401267A1 WO 1994001267 A1 WO1994001267 A1 WO 1994001267A1 GB 9301408 W GB9301408 W GB 9301408W WO 9401267 A1 WO9401267 A1 WO 9401267A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
coating material
space
during
retaining
Prior art date
Application number
PCT/GB1993/001408
Other languages
English (en)
Inventor
Andrew Paul Bastow
Douglas Christopher Mildenhall
Original Assignee
Clearplas Limited
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 Clearplas Limited filed Critical Clearplas Limited
Publication of WO1994001267A1 publication Critical patent/WO1994001267A1/fr

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
    • 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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14196—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 inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
    • 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
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/681—Component parts, details or accessories; Auxiliary operations
    • B29C70/683—Pretreatment of the preformed part, e.g. insert
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
    • 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
    • B29C2045/14155—Positioning or centering articles in the mould using vacuum or suction

Definitions

  • the invention relates to a method and apparatus for applying surface coatings on moulded articles.
  • molten plastics is introduced into the mould under pressure to ensure that the plastics when set conforms to and reproduces the shape of the mould. Subsequent to release of the plastics article from the mould it is sometimes necessary to apply a surface coating to the article for example a paint finish. Other surface coatings may also be applied, for example, carpet or textile materials to a part of the surface of the article. In applying such materials it is necessary to ensure that the material is firmly adhered to the article, that the edge of the material presents a neat and defined edge or finish, that the material does not become compressed or otherwise distorted, and/or that the combining of the surface coating with the moulding is achieved in a cost effective manner.
  • a surface coating for example a paint finish.
  • Other surface coatings may also be applied, for example, carpet or textile materials to a part of the surface of the article. In applying such materials it is necessary to ensure that the material is firmly adhered to the article, that the edge of the material presents a neat and defined edge or finish, that the material does not become compressed or otherwise
  • An object of the invention is to provide an improved method and apparatus for applying surface coatings to moulded articles.
  • a method of applying a surface coating to an injection moulded article comprises locating compressible surface coating material over at least part of a mould space of an injection moulding machine, retaining the material in position in the mould by retaining means at least during the introduction of molten plastics material into the mould space, putting the plastics material under pressure in the mould space at a pressure insufficient to materially permanently affect the characteristics of the coating material whereby, upon solidifcation of the plastics material the coating material is adhered to the plastics material for removal of the article from the mould with the coating material adhered thereto.
  • the molten plastics material is put under pressure during at least part of the moulding operation by the introduction of pressurised fluid, conveniently nitrogen, into the molten plastics material within the mould space.
  • pressurised fluid conveniently nitrogen
  • the coating material is carpet material having a compressible pile secured to a backing material, leather material, textile material or other soft and/or resilient material to be applied as a coating to the plastics article.
  • the coating material may be retained in the mould prior to and during the moulding process by a part of the mould engaging with the coating material such as by a movable part of the mould cooperating with the coating material carried on a fixed part of the mould when the parts are brought together.
  • the coating material may be secured to the mould prior to introduction of molten plastics material into the mould such as by releasable hooks locating with the coating material.
  • the coating material may be secured in the mould by locating means such as reciprocal pins during the early part of the moulding operation, such locating means being removed from engagement with the coating material to complete the moulding process.
  • the coating material may be retained by introducing the molten plastics into selected parts of the mould space and onto the coating material at different stages during the moulding process.
  • the retaining means may comprise a plurality of tags which are each secured to the coating material and, during a moulding operation, the tags are releasably secured in relation to the mould surface against which the coating material is located, the tags being rleased from the mould surface on removal of the article from the mould.
  • the tags may each take the form of a flexible strand or length having enlarged portions at its ends.
  • the coating material may be retained by adhering a sheet of flexible material over the coating material, applying the coating material into the mould space and holding the coating material in space by the application of a vacuum to the mould space surface adjacent the flexible sheet.
  • the .mould is provided with means for shaping the coating material to provide the desired finish at the edges of the coating material.
  • Such means may be cutting means movably carried to cooperate with the mould during or at the conclusion of a moulding process to cut the coating material and define an edge of the material.
  • apparatus for applying a coating material to injection moulded articles comprises an injection moulding machine having a mould space in which the articles are to be formed, a receiving surface within the mould space in which a compressible surface coating material is locatable, retaining means for retaining the coating material on said receiving surface in a fixed position at least during introduction of molten plastics material into the mould space, inlet means for the molten material, pressurising means for putting the plastics material under pressure within said space at a pressure insufficient to materially permanently affect the characteristics of the coating material, and release means for releasing the moulded article with the coated material adhered thereto from the mould space.
  • the moulding machine includes means for introducing pressurised fluid, preferably nitrogen, into the mould space during the moulding process whereby the pressure imparted to the molten material during operation is, at least in part, the pressure of the pressurised fluid.
  • the mould space is generally defined between a fixed mould part and a movable mould part and the fixed mould part may define the receiving surface for the surface coating material.
  • the movable mould part cooperates with the fixed mould part and with the surface coating material when the fixed and movable mould parts are brought together.
  • a movable member is associated with the mould parts to locate the surface coating material at least during the initial stage of the moulding process.
  • the surface of the mould space may be provided with releasable gripping means for gripping the material during the moulding process.
  • a molten plastics may be arranged for introduction to the mould space at a plurality of positions, the points of introduction of the plastics material being changed during the moulding process to ensure retention of the surface coating material at the desired position.
  • the apparatus may include cutting means for cutting the surface coating material to define an edge thereof while coating material is located in the mould space.
  • plastics injection moulded articles can be coated with coating material in the mould, especially when using a low pressure injection moulding system.
  • Fig. 1 is a schematic cross section through part of an injection moulding machine
  • Figs. 2 and 3 are cross sections of part of a mould arrangement for a moulding machine
  • Fig. 4 is a cross section of part of another mould arrangement for a moulding machine
  • Figs. 5 and 6 are a plan view and a cross section showing retaining means for coating material
  • Fig. 7 is a cross section of part of a further mould arrangement for a moulding machine
  • Fig. 8 is a cross section of part of a still further mould arrangement for a moulding machine
  • Fig. 9 is a cross section of part of a further mould arrangement for a moulding machine
  • Fig.10 is a cross section of a still further mould arrangement
  • Fig. 11 is a cross section corresponding to Fig. 10 of an alternative arrangement.
  • an injection moulding machine is generally of conventional form having mould parts 10 and 11 defining a mould space 13.
  • the mould part 10 is mounted on a fixed platen 14 and the mould part 11 is mounted on a movable plate 15 and is usually moved by a hydraulic ram (not shown) towards and away from the fixed mould part 10.
  • Molten thermoplastics material is introduced into the mould space 13 through a conduit 17 in the fixed mould part 12 and in the platen 14.
  • a duct 18 in the movable mould part 11 through which pressurised fluid, preferably nitrogen gas, is introduced into the mould space 13.
  • the mould space 13 is shaped according to the moulded article to be produced, in this case a moulded part of a motor vehicle on which a coating material, such as carpet material, is to be adhered.
  • a coating or covering material 20 of the requisite size and shape Prior to commencement of a moulding operation a coating or covering material 20 of the requisite size and shape is located against a surface 21 of the mould space 13 with the movable platen 15 and mould part 11 in the retracted or withdrawn position.
  • the material 20 is retained in position in the space 13 by one of several means to be described or by seating the material against a defined portion of the mould space surface 21 such as a shoulder, depression or edge.
  • Such retaining means needs to retain the material in position during moulding without the material moving or becoming distorted by undesired stretching or deformation when the molten plastics is introduced.
  • thermoplastics material 23 is then introduced to the mould space 13 under pressure along the duct 17 in known manner.
  • pressurised gas is introduced into the plastics material in the mould space along the duct 18, the end of which protrudes into the mould space 13 and the gas forms a gas channel 24 in the plastics material which in the completed article becomes a void.
  • the coating material 20 becomes adhered to the plastics material.
  • the movable mould part 11 is moved to the withdrawn position and the moulded article complete with the covering 20 adhered thereto is removed.
  • injection moulding methods can also be used such as gas melt injection moulding, 2K moulding and other low pressure moulding methods.
  • the coating material 20 is located on the receiving surface 21 of the fixed mould part 10, the receiving surface 21 having a right-angle portion.
  • the movable mould part 11 is formed with an edge portion 30 which cooperates with part of the receiving surface 21, designated 21A, and adjacent the edge 30 is a recess 31.
  • the edge 30 locates between the covering 20 and the surface 21A and the edge of the covering 20 is turned over and is received in the recess 31 to take up the position shown in Fig. 3.
  • the molten thermo plastics material is injected into the mould space 13, as previously described.
  • the coating material 20 Upon setting of the thermo plastics material it is adhered to the coating material 20 so that upon withdrawal of the movable mould part 11 the coating material takes up a curved profile along its edge and is firmly adhered to the plastics.
  • Fig. 4 an alternative means for locating the covering material 20 is illustrated.
  • the movable mould part 11 carries a blade 33 reciprocally movable relative to the mould part 11 by hydraulic or other means.
  • the blade 33 At its extended position the blade 33 has a portion 34 which enters the mould space 13 to locate an edge of the material 20 so that the material 20 is retained against the surface 21 in the desired position.
  • the blade 33 remains in its extended position during the introduction of the molten thermo plastics material 23 into the mould space 13.
  • the blade 33 is withdrawn from the extended position to a position in which the portion 34 is in alignment with the surface 21 during the later stages of injection of the plastics material. This arrangement ensures that the coating material 20 has a clearly defined edge flush with the surface of the solidified plastics material.
  • Figs. 5 and 6 there is shown another means for retaining the coating material 20 in the mould part during introduction of the molten thermo plastics material into the mould space.
  • the surface 21 of the mould space has fixed to it material 36 carrying a plurality of hooks 37 which are intended to locate the coating material 20 in the manner of Velcro (trade mark) material.
  • Velcro trademark
  • Fig. 7 of the drawings an alternative retaining arrangement is shown.
  • the coating material 20 is located against a surface 21 of the mould space 13 on the fixed mould part 10. It is retained in position prior to a moulding operation by reciprocal pins 39 which at the commencement of the introduction of the molten thermo plastics material 23 into the mould space 13 are in the extended position as shown in Fig. 7.
  • the pins 39 are then retracted so that their ends lie flush with the side of the mould space and further thermo plastics material is injected to fill the spaces left by the pins 39.
  • thermo plastics material 23 may be introduced through nozzle 1 initially, the shut off valve associated with nozzle 1 is closed and that associated with nozzle 2 is opened so that the nozzles are successively opened and closed. If desired two nozzles, say 1 and 7, can be opened and closed together. In this way the material 20 is retained in the mould space 13 in the required position.
  • Fig. 9 another arrangement for retaining and trimming the coating material 20 is shown.
  • the length of coating material 20 is laid against a surface 21 in the movable mould part and overlaps the mould space 13, the overlapping portion being located between the mould parts 10 and 11.
  • Cutters 42 are reciprocally movable relative to the mould part 11 and during the moulding operation are extended towards the mould part 10 to trim the overlapping edges of the coating material 20 so that the edges lie flush with the ends of the plastics material 23.
  • a sheet of flexible plastics material such as polythene sheet is first applied to the surface of the covering material and adhered thereto, in the case of carpet, to the pile of the carpet.
  • the adhesive is of the kind which will subsequently allow the sheet to be removed without adversely affecting the surface of the material 20.
  • the covering material 20, with the flexible sheet applied thereto, is placed against the surface 21 of the mould space 13 and the surface 21 is provided with a plurality of openings 45 each communicating with a source of vacuum.
  • the material 20 is drawn on to the surface 21 and retained thereon due to the use of the flexible impervious sheet.
  • the flexible sheet is removed from the mould with the completed article and the sheet may be released from the article at any convenient time which may be after the article has been fitted to, for example, a vehicle.
  • the flexible sheet can also act as a protective cover over the coating material 20 after the article is formed.
  • Fig. 11 another arrangement for holding the covering material 20 in position during a moulding operation is shown.
  • a plurality of tags 46 are attached through the covering material to be secured thereto.
  • Each of the tags 46 is formed as a strand or length of flexible plastics and at the ends of each length are formed enlarged portions, for example, more rigid portions extending transverse to the length in the form of a rod or tab, of the kind used for labelling garments.
  • the tags 46 are affixed to the backing of the carpet or other coating material by inserting one end through the weave so that the other end projects outwardly of the material 20.
  • clamping means 47 In the surface 21 of the mould space 13 against which the material 20 is to be located there are arranged clamping means 47 in which the free ends of the tags 46 may be clamped when the material 20 is in the desired position.
  • the material is held in place with the tags 46 clamped and upon completion of the moulding operation the clamping means 47 are released to allow the article with its covering 20 to be removed. After removal the protruding parts of the tags are cut off flush with the surface of the covering material.
  • the clamping means 47 may be hydraulically operated to open end close jaws which engage the tags.
  • the invention in fixing coating material to injection moulded articles during the moulding operation, provides a quick and simple system for providing the desired finish to the moulded article. It avoids a separate stage in applying the coating to the article and ensures that the coating material becomes an integral part of the article while providing a neat and attractive assembly, without the need for trimming the edges of the coating material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Afin de pouvoir appliquer par injection des revêtements de surface (20) compressibles dans des articles moulés pendant la phase de moulage, on place et on retient le revêtement dans l'espace du moule afin d'occuper une zone définie de la surface de l'espace du moule. On introduit de la matière plastique fondue dans l'espace (13) du moule à une pression relativement basse et on injecte du gaz pour pressuriser la matière plastique. On propose différentes façons de maintenir le revêtement en position dans le moule.
PCT/GB1993/001408 1992-07-07 1993-07-05 Application de revetements de surface sur des articles moules WO1994001267A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9214426.0 1992-07-07
GB929214426A GB9214426D0 (en) 1992-07-07 1992-07-07 Applying surface coatings on moulded articles

Publications (1)

Publication Number Publication Date
WO1994001267A1 true WO1994001267A1 (fr) 1994-01-20

Family

ID=10718347

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001408 WO1994001267A1 (fr) 1992-07-07 1993-07-05 Application de revetements de surface sur des articles moules

Country Status (2)

Country Link
GB (2) GB9214426D0 (fr)
WO (1) WO1994001267A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
FR2717116A1 (fr) * 1994-03-12 1995-09-15 Otto Deuschle Modell Formenbau Pièce moulée en matière plastique doublée d'une feuille, ainsi que procédé et dispositif pour sa fabrication.
CN102229226A (zh) * 2011-07-07 2011-11-02 宁波市阳光汽车配件有限公司 复合簇绒地毯塑料内饰件的注塑模压成型方法

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EP0630731A1 (fr) * 1993-06-23 1994-12-28 Siebolt Hettinga Procédé pour mouler un article en matière plastique en utilisant un système de commande de volume du type multi-point
JPH08227637A (ja) * 1994-02-23 1996-09-03 Matsushita Electric Works Ltd コントロールスイッチ及びその製造方法
GB9508218D0 (en) * 1995-04-22 1995-06-07 Pathfinder Traffic Signs Limit Improvements in or relating to moulded articles
AT1126U1 (de) * 1995-07-17 1996-11-25 Engel Gmbh Maschbau Verfahren zum pressen von kunststoff
DE19827706C2 (de) * 1997-07-11 2002-04-11 Ford Motor Co Verfahren zum Befestigen eines Abdeckmaterials an einem spritzgegossenen Kunststoffteil
US5979043A (en) * 1997-07-14 1999-11-09 Ford Motor Company Method of manufacturing a circuit assembly from two or more layers of flexible film
WO2001096087A1 (fr) 2000-06-12 2001-12-20 Green Tokai Co., Ltd. Co-moulage par injection avec ligne de raccord decalee
JP3911494B2 (ja) 2001-05-31 2007-05-09 大和化成工業株式会社 射出成形方法および射出成形装置
EP1302363A1 (fr) * 2001-10-09 2003-04-16 HV Developpement, SARL Procédé de fabrication de tapis de sol pour véhicule automobile, moule d'injection pour la mise en oeuvre du procédé et tapis de sol ainsi obtenu
US20070199797A1 (en) * 2006-02-24 2007-08-30 Dow Global Technologies Inc. Molded parts with fabric surface areas and processes for their production
WO2008060215A1 (fr) * 2006-11-14 2008-05-22 International Automotive Components Group Ab Moule et procédé de fabrication de panneaux intérieurs par technique de moulage par injection

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Publication number Priority date Publication date Assignee Title
US3363040A (en) * 1965-10-12 1968-01-09 Aoki Katashi Apparatus and process for injection molding a plastic tray
GB1150052A (en) * 1966-04-01 1969-04-30 Mark Hubel Improvements relating to Panels
DE2450192A1 (de) * 1973-10-30 1975-05-15 Bertrand Faure Puteaux Ets Verfahren zum formen von kunststoffgegenstaenden mit wenigstens einem versteifungselement
DE2361510A1 (de) * 1973-12-11 1975-06-19 Continental Gummi Werke Ag Form zur herstellung eines schuhbodenteiles mit intarsie
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