EP0809569A1 - Structure isolee destinee a habiller un meuble frigorifique - Google Patents

Structure isolee destinee a habiller un meuble frigorifique

Info

Publication number
EP0809569A1
EP0809569A1 EP96902336A EP96902336A EP0809569A1 EP 0809569 A1 EP0809569 A1 EP 0809569A1 EP 96902336 A EP96902336 A EP 96902336A EP 96902336 A EP96902336 A EP 96902336A EP 0809569 A1 EP0809569 A1 EP 0809569A1
Authority
EP
European Patent Office
Prior art keywords
sheets
tools
insulated structure
plastics material
casing
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Withdrawn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
EP96902336A
Other languages
German (de)
English (en)
Inventor
Michael Graham Reid
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.)
Indesit Co UK Ltd
Original Assignee
Hotpoint Ltd
General Domestic Appliances 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 Hotpoint Ltd, General Domestic Appliances Ltd filed Critical Hotpoint Ltd
Publication of EP0809569A1 publication Critical patent/EP0809569A1/fr
Withdrawn legal-status Critical Current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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/266—Auxiliary operations after the thermoforming operation
    • B29C51/267—Two sheets being thermoformed in separate mould parts and joined together while still 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/02—Doors; Covers
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/328—Leaving the burrs unchanged for providing particular properties to the joint, e.g. as decorative effect
    • B29C66/3282—Leaving the burrs unchanged for providing particular properties to the joint, e.g. as decorative effect for reinforcing the joint
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4326—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms for making hollow articles or hollow-preforms, e.g. half-shells
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • 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
    • B29L2024/00—Articles with hollow walls
    • 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
    • B29L2031/762—Household appliances
    • B29L2031/7622—Refrigerators

Definitions

  • This invention relates to the fabrication of an insulated structure for the casing of a
  • an insulated structure such as the door panel or panels of a refrigeration appliance
  • the invention provides a method of fabricating an insulated structure forming part of the
  • casing of a refrigeration appliance which comprises applying reduced pressure to draw a pair
  • the insulated structure may be a door of a refrigerator, freezer, or combined
  • refrigerator/freezer but it is also possible to fabricate the cabinet of such an appliance as well
  • the invention also provides an insulated structure fabricated in accordance with the method
  • Insulated structures for the casing of a refrigeration appliance fabricated in accordance with
  • Figure 1 is a perspective view of a refrigerator
  • Figure 2 is a plan view of the door of the refrigerator
  • Figure 3 is a front elevation of the door of the refrigerator
  • Figure 4 is a side elevation of the door of the refrigerator
  • FIG. 5 is a fragmentary section through the top of the door taken through the lines A-A in Figure 3;
  • Figure 6 is a schematic view of apparatus for fabricating the door shown in Figures 1 to 5;
  • Figure 7 is a sectional view of the door after fabrication, and corresponding to the sectional
  • Figure 8 is a view on an enlarged scale of a part of the apparatus of Figure 6;
  • Figure 9 illustrates a prior art method of welding
  • Figure 10 illustrates one form of sheet of plastics material
  • Figure 11 illustrates schematically apparatus for fabricating an insulated structure which forms
  • Figure 12 is a horizontal cross-section through the insulated structure fabricated by the
  • the refrigerator consists of a door 1 and a cabinet 2 each fabricated in accordance with the invention.
  • the refrigerator is fitted with a compressor, a condenser and an evaporator in a refrigeration circuit, but these are not illustrated.
  • the door consists of an
  • the inner skin of the door 3 also has a recess 3d
  • the door as seen in Figures 2 and 5, has an integral recess 4a which serves as a handle for
  • the inner skin 5 of the cabinet has raised ribs 5a-5c to hold shelves (not shown).
  • the projections 3a-3c also have raised bosses or ribs which are not shown in order to support shelves and compartments.
  • the door is fabricated as follows. Two sheets of plastics material 7, 8 are heated respectively, from the top and from the bottom until they are respectively above their softening points, while being held apart by frames 9, 10 and 11.
  • the sheets are then moved sideways to a position between a pair of tools 12, 13. These are lOmaintained at a temperature just below the softening point of the respective plastics materials.
  • the tools are shown as having respective orifices 12a, 13a but, in practice, each tool would have several hundred such orifices.
  • the orifices are provided in order to apply a vacuum to the front face of the tools.
  • the sheets can be of dissimilar plastics material, but the squeezing of the material results in an integrated structure at the seam.
  • polyurethane for example polyurethane
  • the hole can be filled with granules of powder such as silica or fly 20ash (EP 0 190 582, EP 0 254 993) by vibrating the moulding, whereupon vacuum can be
  • the sheet in that in addition to the structural layer 18, the sheet also has an integral gas impermeable layer such as EVOH (ethylene vinyl alcohol) together with a water barrier 20 such as polypropylene.
  • EVOH ethylene vinyl alcohol
  • the door thus produced has an acceptable outside appearance, is rigid because of the filling
  • the outer skin 7 is formed of a thicker plastics
  • Suitable materials for the outer skin are ABS (acrylo-nitrile butadiene styrene), high impact polystyrene, polycarbonate or polypropylene. Suitable
  • lOmaterials for the inner skin are any of the above excluding polycarbonate which would generally not be used for the inner skin because of its higher expense.
  • the layers would be 5mm for the outer layer and 3mm for the inner layer, and a typical thickness after squashing between the tools would be less than 4mm.
  • the outer material is chosen for its appearance and the inner skin for its ability to be deep drawn.
  • the tool may have
  • the combined thickness of material at that line is less than the combined thickness of the
  • the aperture 10a allows air in to allow the sheets to be drawn over the
  • Typical materials for the inner skin layer 7 are: crystal polystyrene, high impact polystyrene, ABS, polypropylene; and typical materials for the outer skin layer 8 are: those for the inner
  • lOskin or polycarbonate Suitable thicknesses would be around 5mm for the inner skin 7 and around 6mm for the outer skin 8.
  • the sheets 7 and 8 could be of laminated construction as for the door.
  • 15refrigeration apparatus preferably as a module to it.
  • the invention is also applicable to a freezer, or to a
  • fridge/freezer having one or multiple doors for respective compartments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Refrigerator Housings (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Packages (AREA)

Abstract

L'invention porte sur une structure isolée telle que la porte d'un meuble frigorifique fabriquée en une seule opération consistant à former simultanément sous vide deux couches de plastique (7, 8) sur leurs outils respectifs (12, 13) et à rapprocher ces outils l'un de l'autre avec une force telle qu'une certaine quantité de plastique est expulsée du joint périphérique, ce qui permet de constituer une structure intégrale le long du joint et de conférer à ce dernier une certaine solidité.
EP96902336A 1995-02-16 1996-02-13 Structure isolee destinee a habiller un meuble frigorifique Withdrawn EP0809569A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9503009A GB2297937A (en) 1995-02-16 1995-02-16 Insulated structure for the casing of a refrigeration appliance
GB9503009 1995-02-16
PCT/GB1996/000296 WO1996025287A1 (fr) 1995-02-16 1996-02-13 Structure isolee destinee a habiller un meuble frigorifique

Publications (1)

Publication Number Publication Date
EP0809569A1 true EP0809569A1 (fr) 1997-12-03

Family

ID=10769688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96902336A Withdrawn EP0809569A1 (fr) 1995-02-16 1996-02-13 Structure isolee destinee a habiller un meuble frigorifique

Country Status (6)

Country Link
EP (1) EP0809569A1 (fr)
JP (1) JPH11500074A (fr)
KR (1) KR19980702250A (fr)
GB (1) GB2297937A (fr)
TR (1) TR199700773T1 (fr)
WO (1) WO1996025287A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004172087A (ja) * 2002-11-05 2004-06-17 Ngk Insulators Ltd ディスプレイ
KR101227516B1 (ko) 2010-10-28 2013-01-31 엘지전자 주식회사 진공공간부를 구비하는 냉장고
KR101147779B1 (ko) 2010-10-28 2012-05-25 엘지전자 주식회사 진공공간부를 구비하는 냉장고

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB840394A (en) * 1957-06-26 1960-07-06 Standard Pressed Steel Co A method of moulding a double-walled structure such as a refrigerator door
GB936088A (en) * 1960-11-15 1963-09-04 Woodall Industries Inc Process of forming hollow plastic structure
US3311683A (en) * 1962-12-31 1967-03-28 Formex Mfg Inc Vacuum forming method
GB1060730A (en) * 1962-12-31 1967-03-08 Formex Mfg Inc Vacuum forming method and apparatus
US3398434A (en) * 1965-12-07 1968-08-27 Formex Mfg Inc Vacuum forming apparatus
DE1604473A1 (de) * 1966-08-09 1970-10-29 Chemie Ind Invest Ag Verfahren zur Herstellung eines doppelwandigen Behaelters aus Kunststoff in Kastenform,nach dem Verfahren hergestellter Behaelter,Mittel zur Ausfuehrung des Verfahrens und Verwendung des Behaelters
DE2039291A1 (de) * 1970-08-07 1972-02-10 Wolfgang Arnold Verfahren und Vorrichtung zur Herstellung eines Hohlkoerpers als Bauteil fuer Moebel u.dgl.
US3790420A (en) * 1971-11-08 1974-02-05 Gen Motors Corp Method of making a sunshade
CA993165A (en) * 1971-11-22 1976-07-20 Peter T. Schurman Plastic article and blow molding method and apparatus
GB1452795A (en) * 1974-03-07 1976-10-13 Morris T M Flexible and buoyant articles and to methods of manufacturing them
US4423000A (en) * 1980-10-17 1983-12-27 Syoichi Teraoka Method for molding hollow plastic articles
EP0289764A3 (fr) * 1987-04-07 1989-10-18 Liebherr-Hausgeräte Gmbh Procédé pour remplir par de la mousse l'espace creux en forme de cloche entre des parois internes et externes de récipients ou analogues, de préférence l'espace creux entre les parois internes et externes de réfrigérateurs ou de congélateurs
IT1230680B (it) * 1987-09-07 1991-10-29 Montedipe Spa Corpi formati in materiale termoplastico e procedimento per la loro produzione.
DE4117197A1 (de) * 1991-05-26 1992-12-03 Ernst Hombach Inh Rudolf Tobol Verfahren zur herstellung von kunststoffteilen und vorrichtung zur durchfuehrung des verfahrens
US5306082A (en) * 1992-06-12 1994-04-26 James Karlin Appliance doors and panels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9625287A1 *

Also Published As

Publication number Publication date
GB9503009D0 (en) 1995-04-05
KR19980702250A (ko) 1998-07-15
TR199700773T1 (xx) 1998-02-21
JPH11500074A (ja) 1999-01-06
WO1996025287A1 (fr) 1996-08-22
GB2297937A (en) 1996-08-21

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Legal Events

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Effective date: 19971223

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Owner name: GENERAL DOMESTIC APPLIANCES LIMITED

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Effective date: 19990409