EP0797060A2 - Verfahren zum Anbringen eines Metallbleches auf der Aussenseite eines Kühlbehälters - Google Patents

Verfahren zum Anbringen eines Metallbleches auf der Aussenseite eines Kühlbehälters Download PDF

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Publication number
EP0797060A2
EP0797060A2 EP96202034A EP96202034A EP0797060A2 EP 0797060 A2 EP0797060 A2 EP 0797060A2 EP 96202034 A EP96202034 A EP 96202034A EP 96202034 A EP96202034 A EP 96202034A EP 0797060 A2 EP0797060 A2 EP 0797060A2
Authority
EP
European Patent Office
Prior art keywords
ribbon
adhesive
aluminum
refrigerating container
sheet
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.)
Granted
Application number
EP96202034A
Other languages
English (en)
French (fr)
Other versions
EP0797060A3 (de
EP0797060B1 (de
Inventor
Luigi Fieramonte
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.)
Individual
Original Assignee
Individual
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
Priority claimed from ITMI960540 external-priority patent/IT1283278B1/it
Priority claimed from IT96MI001105 external-priority patent/IT1289536B1/it
Application filed by Individual filed Critical Individual
Publication of EP0797060A2 publication Critical patent/EP0797060A2/de
Publication of EP0797060A3 publication Critical patent/EP0797060A3/de
Application granted granted Critical
Publication of EP0797060B1 publication Critical patent/EP0797060B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F25D23/06—Walls
    • F25D23/062—Walls defining a cabinet

Definitions

  • La present invention relates to the manufacturing of refrigerating apparatuses, freezers and the like, that is refrigerators in a broad sense, and more precisely to a process for applying a heat-conductive metal sheet to the outer surface of a refrigerating container or freezer.
  • the invention concerns a composite or multi-layer ribbon adapted to be deposited onto the outer surface of a refrigerating container for lowering the temperature thereof in cooperation with a refrigerating coil.
  • the invention is further concerned with a process for applying a portion of such a composite ribbon material to the outer surface of white goods (appliances) for cooling foodstuffs such as refrigerators and the like.
  • the refrigerating coil is (usually) located outside the back wall of the plastic material container forming the refrigerating apparatus.
  • a thin sheet of a heat conducting material such as a metal
  • a thin metal sheet of aluminum sticked to the outer wall of the apparatus and in relation of thermal exchange with the cooling coil.
  • Such metal sheet arrangement is made to adhere to the plastic material wall of the refrigerator by means of a suitable adhesive or a glue, e.g. by previuously applying a bi-adhesive tape or by spreading an adhesive over the wall surface and pressing the metal sheet onto the former.
  • a sheared or punched sheet of aluminum provided with a bi-adhesive tape or a layer of spread adhesive on one or both faces.
  • the known methods require that the aluminum be manually deposited, both for separating the foil protecting the adhesive and for the deposition operation of the aluminum sheet over the container. Therefore, the precise positioning of the sheet depends on the operator and is often unsatisfactory.
  • a further object of the invention is to realize a process of the above type that can be performed in line and in a continuous (uninterrupted) manner.
  • Another object of the invention is to realize a ribbon-like article of heat-conductive material adapted to be quickly and easily applied to the outer surface of a refrigerating container.
  • the invention consists of a process for applying to the outer surface of white goods (appliances) for cooling foodstuffs such as refrigerators and the like, an aluminum covering layer acting as a heat distributor for the refrigerating coil that is in thermal contact with such layer.
  • the invention consists of a composite ribbon to be applied to the outer surface of a refrigerating container, with the composite ribbon incorporating a layer of an adhesive resistant both to low temperatures ( ⁇ -55°C) and to high temperatures (> 125°C).
  • the composite ribbon can be supplied with the width required by the refrigerator manufacturer and this latter can apply the desired amount of aluminum through a simple depositing and cutting apparatus in a continuous process, without the additional costs coming from having to shear and/or punch the blanks in advance.
  • the concept underlying the present invention is that of using a simple thin aluminum ribbon and to deposit a suitable layer of adhesive either over the sheet or over the refrigerator surface, or over an intermediate support.
  • Fig. 1 schematically depicts a refrigerator or refrigerating container 1 provided with a layer 4 of metal sheet applied over the outer surface of the back wall 2.
  • a refrigerating coil 3 is arranged over the metal sheet 4 and for simplicity sake the protective coating covering the coil 3 has been omitted in the Figure.
  • the layer 4 is made up by an aluminum thin sheet or foil glued onto the outer wall 2 of the refrigerating apparatus 1. After the aluminum sheet has been applied, the coil 3 is superimposed and secured to it in a conventional manner so as to be in thermal contact with the sheet over its whole extension.
  • Fig. 2 schematically shows a roll 8 of a heat-conductive ribbon material according to the invention, formed by a laminated or composite sheet 9 comprising an aluminum sheet 10 having the properties and characteristics specified later on, an adhesive or biadhesive tape including a support 11 and an adhesive layer 12 applied to a face of the aluminum sheet, and a ribbon of a protective and separating material 13, typically silicone treated paper, for preventing the sticking of the adhesive layer when the ribbon is wound to form the roll 8.
  • other protection means can be provided such as a plastic sheath, a heat meltable adhesive, etc.
  • the adhesive ribbon can be applied, if desired, on both faces of the aluminum sheet 10.
  • the material of the sheet 10 is aluminum with a purity higher than 98%, and preferably higher than 99%, and with a density from 2 to 3,5 g/cm 3 .
  • the thickness of the aluminum sheet is generally comprised between 80 and 200 microns, and preferably between 140 and 160 microns.
  • the thermal conductivity of the material forming the sheet is larger than 200 W/m°C, and its specific heat is about 950 J/kg°C.
  • the melting temperature of the aluminum forming the sheet 10 is comprised between 630 and 670°C, and preferably between 640 and 660°C. In the temperature range from 0 to 100°C the coefficient of thermal expansion is comprised between 20 and 25x10 -6 °C.
  • the layer or liner 11 has a weight of about 80 gr/cm.
  • the material forming the adhesive layer 12 è preferably an acrilic self cross-linking adhesive with a glass temperature (Tg) not lower than -50° and higher than 250°.
  • the adhesive material is applied with a basis weight comprised between 20 and 60 g/cm 2 and its adhesion characteristics are listed in the following Table 1.
  • Table 1 ADHESIVENESS SHEAR (N/inch) on steel on polystyrene 9.53 - 10.23 8.56 - 9.73 56.25 - 57.97 where the dynamic shear test indicates the force exerted by the adhesive against the slipping over the object on which the aluminum ribbon has been applied.
  • the sheet according to the invention does not show any sign of degradation or peeling off from the support. More particularly the peeling force in a peel test according to FINAT standard, between -55° and +125°C, was higher than 14 N/inch on polystyrene after the aging tests.
  • the refrigerating apparatus or container 1 is horizontally positioned over a supporting plane 10 in a conveyor system 20 and a predetermined length of the composite ribbon 9, rotatably mounted on a support (not shown), is unwound from the roll 8 while the silicone treated paper 13 is removed and wound on a collecting roll 16.
  • the leading edge of the ribbon 9 is applied onto the surface 2 of the refrigerator, at the desired location, and then a rubber idle roll 15 is brought into contact with the deposited ribbon in correspondence of the leading edge. Then the roll 15 is firstly moved towards the roll 8, thus pressing the ribbon 10 and squeezing out the air trapped therebetween. The return movement of the rubber roll 15 achieves the complete adhesion of the ribbon 9 and positions the roll for the next application cycle.
  • the hardness of roll 15 is higher than 60 Shore A and the application takes place under a pressure of at least 1,5 kg/cm 2 .
  • a thin flow of hot air is directed across the aluminum ribbon in order to soften the layer of adhesive 12, thus improving the preliminary sticking to the container.
  • Such hot air flow produced by means not shown in the drawings, can be directed to lick either the upper face of the ribbon or the lower one (i.e. directly over the adhesive).
  • a cutter 7 shears the ribbon at a predetermined length and the refrigerating container is moved to the next step of the manufacturing process.
  • FIG. 4 illustrates another embodiment of the process of the invention.
  • a horizontally positioned refrigerating container 1 is advanced over a conveyor line comprising a conveyor belt 19 and rolls 18, with the back surface 2 facing upwards.
  • a roll 23 of a simple aluminum ribbon 10 having predermined width and thickness is unwound by means of driven rolls (not shown).
  • the ribbon 10 runs horizontally for a first section where a dispenser 24 uniformely applies a predetermined amount of a suitable adhesive 28.
  • a return roll 5 and an idle roll 6 reverse the advancing direction of the ribbon before and overturns it so that is can be directly applied onto the surface 2 of the underlying refrigerating container 1.
  • a cutter 17 accomplishes the cut of the desired length of ribbon 10, and a pressing roll 15 is moved back and forth (as indicated by the arrows) for causing the ribbon 10 to adhere to the surface of the refrigerating container.
  • the adhesive 28 is a temperature sensitive adhesive, i.e. it has to be heated for becoming sticking
  • the roll 15 can be internally heated, or alternative means can be provided for generating a laminar flow of a hot fluid in correspondence of the refrigerating container. Such means can be employed also in the other embodiments of the present invention.
  • the refrigerating container 1 is horizontally advanced on a conveyor belt 19 located beneath a dispenser 24 of an adhesive 28.
  • the dispenser 24 deposits a uniform layer of adhesive 28 over the back surface 2 of the refrigerating container 1, and then the refrigerating container 1 is advanced to a next station under a roll 6 of an aluminum ribbon 10.
  • the aluminum ribbon 10 is unwound and a length thereof is positioned over the refrigerating container 1 in correspondence of the area covered by the deposited adhesive 28. Then the aluminum ribbon 10 is pressed over the surface 2 of the refrigerating container 1 by the bidirectional movement of a roll 15 applying a predetermined pressure. Thereafter the aluminum ribbon is cut by the cutter 17 and the refrigerating container is advanced to the next stage of the manufacturing process.
  • FIG. 6 A fourth embodiment of the process according to the invention is schematically illustrated in Fig. 6 on which there is no longer shown the conveyor system.
  • This embodiment of the process according to the invention provides for positioning the refrigerating container 1 firstly under a roll 21 formed by an anti-adhesive ribbon 22, i.e. of a material preventing the sticking or from which a sticking film can be easily removed.
  • the unwound ribbon runs substantially horizontal for a given length, and a layer of adhesive 29 is uniformely deposited over the surface of such anti-adhesive ribbon 22 by a dispenser 24.
  • the ribbon 22 is then turned upside down around a roll 5 and guided by a roll 6, so that the surface carrying the adhesive 29 is facing downwards and the assembly formed by said anti-adhesive ribbon 22 and by the adhesive 29, is applied at the desired location onto the surface 2 of the refrigerator, in a manner similar to that of the above disclosed second embodiment.
  • the composite ribbon formed by the ribbon 22 and the (weakly) attached adhesive 29 is then pressed over the surface 2 by the reciprocating movement of the roll 25 applying a predetermined pressure over them, and the desired length of the assembly 22-29 is cut by the cutter 27.
  • the refrigerating container 1 is advanced and the anti-adhesive material 22 is removed or peeled away, e.g. by means of a blade (not shown). Then the refrigerating container 1 is advanced below a roll 6 of aluminum ribbon, from which a length of ribbbon is unwound and disposed over the refrigerating container 1 in corrispondence of the area covered by the adhesive 29.
  • the metal ribbon 10 is then pressed over the surface 2 by a pressing roll 15 similar to the preceding roll 25 and the aluminum ribbon is then cut at the proper length by the cutter 7. Finally the refrigerating container is advanced to the next stage or station of the manufacturing process.
  • the anti-adhesive material comprises a ribbon of silicone treated paper or other sheet arrangement having anti-sticking properties.
  • the adhesive used in the various embodiments of the process can be formed by a glue plus a solvent, such as a rubber or acrilic base, or a glue partially using a solvent, or a water glue, or even a glue without solvent, such as a hot melt adhesive.
  • a solvent such as a rubber or acrilic base
  • a glue partially using a solvent such as a rubber or acrilic base
  • a water glue such as a hot melt adhesive
  • the step of applying a laminar flow of a hot fluid for softening the adhesive layer can be incorporate in any of the above disclosed processes.
  • a refrigerating container 31 having the back outer wall 32 shaped with grooves 34 for receiving the refrigerating coil 33 in such a manner that it does not protrude from the flat surface of the wall 2.
  • the aluminum sheet 10 is applied and secured to both the outer wall 2 and the coil thanks to an adhesive 38.
  • Fig.s 7A and 7B illustrate a detail of the refrigerating coil that can have either a circular or a semicircular cross section.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP19960202034 1996-03-20 1996-07-17 Verfahren zum Anbringen eines Aluminiumbleches auf der Aussenseite eines Kühlbehälters, und Verbundschichtband Expired - Lifetime EP0797060B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI960540 1996-03-20
ITMI960540 IT1283278B1 (it) 1996-03-20 1996-03-20 Nastro composito e metodo per la sua applicazione alla superficie di elettrodomestici quali frigoriferi e simili
ITMI961105 1996-05-31
IT96MI001105 IT1289536B1 (it) 1996-05-31 1996-05-31 Metodo per applicare una porzione di nastro di alluminio alla superficie esterna di una cella frigorifera

Publications (3)

Publication Number Publication Date
EP0797060A2 true EP0797060A2 (de) 1997-09-24
EP0797060A3 EP0797060A3 (de) 1998-04-15
EP0797060B1 EP0797060B1 (de) 1999-03-24

Family

ID=26331369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960202034 Expired - Lifetime EP0797060B1 (de) 1996-03-20 1996-07-17 Verfahren zum Anbringen eines Aluminiumbleches auf der Aussenseite eines Kühlbehälters, und Verbundschichtband

Country Status (3)

Country Link
EP (1) EP0797060B1 (de)
DE (1) DE69601858T2 (de)
ES (1) ES2132836T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1310751A2 (de) * 2001-11-09 2003-05-14 Whirlpool Corporation Kühlschrank mit einer verbesserten Wärmeisolierung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543196A (en) * 1947-06-16 1951-02-27 Nash Kelvinator Corp Refrigerating apparatus having means to prevent wetting of insulation
FR2501101A1 (fr) * 1981-03-03 1982-09-10 Iv Ker Epitoipari Szovetkezet Produit utilisable dans l'industrie du meuble ou l'industrie de la construction, de preference pour un revetement de surfaces, procede et machine pour sa fabrication
EP0065940A1 (de) * 1981-05-15 1982-12-01 Ryssby Industri Aktiebolag Verfahren zur Oberflächenbehandlung von Holzfurnier oder dessen Ersatz und Vorrichtung zur Durchführung des Verfahrens
EP0121591A1 (de) * 1983-03-08 1984-10-17 Licentia Patent-Verwaltungs-GmbH Kühl- oder Gefriergerät
GB2159763A (en) * 1984-06-06 1985-12-11 Nitto Electric Ind Co Process for sticking adhesive tape on thin article
EP0217121A1 (de) * 1985-09-12 1987-04-08 INDUSTRIE ZANUSSI S.p.A. Kühlgerät mit auf die Wand des Kühlbehälters geklebtem Wärmetauscher

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543196A (en) * 1947-06-16 1951-02-27 Nash Kelvinator Corp Refrigerating apparatus having means to prevent wetting of insulation
FR2501101A1 (fr) * 1981-03-03 1982-09-10 Iv Ker Epitoipari Szovetkezet Produit utilisable dans l'industrie du meuble ou l'industrie de la construction, de preference pour un revetement de surfaces, procede et machine pour sa fabrication
EP0065940A1 (de) * 1981-05-15 1982-12-01 Ryssby Industri Aktiebolag Verfahren zur Oberflächenbehandlung von Holzfurnier oder dessen Ersatz und Vorrichtung zur Durchführung des Verfahrens
EP0121591A1 (de) * 1983-03-08 1984-10-17 Licentia Patent-Verwaltungs-GmbH Kühl- oder Gefriergerät
GB2159763A (en) * 1984-06-06 1985-12-11 Nitto Electric Ind Co Process for sticking adhesive tape on thin article
EP0217121A1 (de) * 1985-09-12 1987-04-08 INDUSTRIE ZANUSSI S.p.A. Kühlgerät mit auf die Wand des Kühlbehälters geklebtem Wärmetauscher

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1310751A2 (de) * 2001-11-09 2003-05-14 Whirlpool Corporation Kühlschrank mit einer verbesserten Wärmeisolierung
EP1310751A3 (de) * 2001-11-09 2003-10-01 Whirlpool Corporation Kühlschrank mit einer verbesserten Wärmeisolierung

Also Published As

Publication number Publication date
DE69601858D1 (de) 1999-04-29
EP0797060A3 (de) 1998-04-15
DE69601858T2 (de) 1999-10-07
ES2132836T3 (es) 1999-08-16
EP0797060B1 (de) 1999-03-24

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