EP2894423A1 - Réfrigérateur - Google Patents

Réfrigérateur Download PDF

Info

Publication number: EP2894423A1
Authority: EP; European Patent Office
Prior art keywords: front plate; resin film; transparent front; urethane foam; edge
Prior art date: 2012-09-10
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

EP13834782.8A

Other languages

German (de)

English (en)

Other versions

EP2894423A4 (fr

EP2894423B1 (fr

Inventor

Junichi Kurita

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.)

Panasonic Intellectual Property Management Co Ltd

Original Assignee

Panasonic Intellectual Property Management Co 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.)

2012-09-10

Filing date

2013-09-04

Publication date

2015-07-15

2012-09-10 Priority claimed from JP2012198238A external-priority patent/JP5532092B2/ja

2012-09-10 Priority claimed from JP2012198237A external-priority patent/JP6167277B2/ja

2012-09-10 Priority claimed from JP2012198239A external-priority patent/JP6236619B2/ja

2013-06-06 Priority claimed from JP2013119502A external-priority patent/JP6043961B2/ja

2013-06-06 Priority claimed from JP2013119503A external-priority patent/JP6089213B2/ja

2013-09-04 Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd

2015-07-15 Publication of EP2894423A1 publication Critical patent/EP2894423A1/fr

2016-04-27 Publication of EP2894423A4 publication Critical patent/EP2894423A4/fr

2017-11-29 Application granted granted Critical

2017-11-29 Publication of EP2894423B1 publication Critical patent/EP2894423B1/fr

Status Not-in-force legal-status Critical Current

2033-09-04 Anticipated expiration legal-status Critical

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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
- F25D23/02—Doors; Covers
- 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
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/18—Aesthetic features

Definitions

the present invention relates to a refrigerator, and more particularly to a door configuration of a refrigerator.
this type of refrigerator includes, in an inside of a refrigerator body having heat insulating properties, a refrigerating compartment, a freezing compartment, a vegetable compartment and the like, which are configured to be openable and closable by a door.
the door includes: a front plate which forms a front surface of a refrigerator body; an inner box frame which forms inner surfaces of a refrigerating compartment, a freezing compartment, a vegetable compartment and the like, and a frame body which integrally connects the front plate and the inner box frame to each other. Further, the door includes urethane filled and foamed in a space defined by the front plate, the inner box frame and the frame body and hence, the door has heat insulation properties in the same manner as the refrigerator body.
the front plate of the door largely influences the aesthetic appearance, that is, the design of the whole refrigerator, and the finish of the front plate largely influences the quality of the whole refrigerator.
FIG. 17 shows an essential part of a door of a conventional refrigerator.
front plate 104 is formed of colored glass plate 103 on which colored layer 102 such as a pattern is formed by silk screen printing.
Urethane foam 107 is filled and foamed in a space defined by front plate 104, inner box frame 105, and frame body 106.
front plate 104 has an advantageous effect that front plate 104 can enhance the design compared to metal-made front plate or a resin coated front plate.
front plate insertion portion 108 is formed in frame body 106, and front plate 104 is fitted into front plate insertion portion 108.
front plate insertion portion 108 is exposed to the periphery of a front surface of colored glass plate 103 and hence, conventional door 101 has a drawback that the improved design acquired by using colored glass plate 103 in front plate 104 is deteriorated.
inventors of the present invention manufactured a door as a prototype where front plate insertion portion 108 is removed from frame body 106 thus bringing the edge portion of colored glass plate 103 into an exposed state as it is, and carried out a life acceleration test.
colored layer 102 formed on colored glass plate 103 by silk screen printing or the like has irregularities in the bonding strength with colored glass plate 103. Accordingly, a bonding state between colored layer 102 and colored glass plate 103 is deteriorated due to thermal shrinkage or changes with time of urethane foam 107 and hence, there has been a case where colored layer 102 is peeled from colored glass plate 103 together with urethane foam 107.
the present invention has been made in view of the above, and it is an object of the present invention to provide a refrigerator with a door which can guarantee a bonding strength of a transparent front plate such as a glass plate over a long period, can enhance the design of the refrigerator, and can continuously maintain the enhanced design.
a door includes: an inner box frame which is positioned inside a refrigerator body in a state where the door is closed; a transparent front plate with a colored layer which is disposed on an edge frame of the inner box frame such that the front plate covers the inner box frame; and urethane foam filled and foamed in a space defined by the transparent front plate and the inner box frame.
the transparent front plate is bonded to and held by the urethane foam, and an outer periphery of the transparent front plate is bonded to the edge frame of the inner box frame with a double-sided tape.
the glass plate in addition to the adhesion with the urethane, the glass plate is also bonded to the edge frame of the inner box frame by way of the double-sided tape and hence, the glass plate is held in a state where the bonding force generated between the glass plate and the edge frame of the inner box frame is added to a bonding force between the glass plate and the urethane. Accordingly, the glass plate is bonded to and held more firmly.
the double-sided tape which provides an adhesive between the transparent front plate and the inner box frame and hence, it is also possible to prevent with certainty the peeling of an adhesive between the urethane foam and the transparent front plate due to the intrusion of water. Accordingly, the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
a transparent front plate insertion portion which covers a peripheral portion of the transparent front plate can be eliminated and hence, the design of the door is not deteriorated, and the door can exhibit neat external appearance having flatness over the whole surface. Still further, it is also possible to prevent the occurrence of the case where dirt, dust or the like sticks to or accumulates in a boundary portion between the transparent front plate insertion portion and the transparent front plate and becomes conspicuous as a line. Accordingly, the initial enhanced design can be maintained as it is over a long period.
FIG. 1 is a perspective view showing an external appearance of a refrigerator according to a first exemplary embodiment of the present invention
FIG. 2 is a cross-sectional view of the refrigerator according to the first exemplary embodiment of the present invention
FIG. 3 is a perspective view of a door of the refrigerator according to the first exemplary embodiment of the present invention
FIG. 4 is an exploded perspective view of the door of the refrigerator according to the first exemplary embodiment of the present invention
FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3 including an enlarged view of an essential part
FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3 .
FIG. 7 is an explanatory view for describing a method of laminating a double-sided tape to an edge frame of the refrigerator according to the first exemplary embodiment of the present invention
FIG. 8 is an enlarged cross-sectional view showing an edge portion of the door of the refrigerator according to the first exemplary embodiment of the present invention.
refrigerator body 1 includes: outer box 2 made of metal (iron plate, for example) with a front surface thereof open; inner box 3 made of a rigid resin (ABS, for example); and rigid urethane foam 4 which is foamed and filled in a space defined by outer box 2 and inner box 3.
Refrigerator body 1 includes, in an inside thereof refrigerating compartment 5; switch compartment 6 positioned below refrigerating compartment 5; ice-making compartment 7 disposed parallel to switch compartment 6; freezing compartment 8 positioned below switch compartment 6 and ice-making compartment 7; and vegetable compartment 9 positioned below freezing compartment 8.
a front surface of refrigerating compartment 5 is closed by double hinged door 10, for example, in an openable manner.
a front surface portion of switch compartment 6, a front surface portion of ice-making compartment 7, a front surface portion of freezing compartment 8 and a front surface portion of vegetable compartment 9 are closed by drawer-type doors 11, 12, 13, 14 respectively in an openable manner.
Cooling compartment 16 is disposed on a back surface of refrigerator body 1. Cooling compartment 16 includes cooler 17 which generates cool air, and air blowing fan 18 for supplying cool air to respective compartments. Compressor 19 is disposed at a top and rear portion of refrigerator body 1. A refrigerating cycle is formed by sequentially connecting compressor 19, a condenser (not shown), heat-radiation pipe 20 for radiating heat, capillary tube 21, and cooler 17 in an annular shape. Cooling operation is performed by hermetically filling a refrigerant in the refrigerating cycle.
rigid urethane is foamed and filled in respective doors 10 to 14 so as to impart heat insulating properties to respective doors 10 to 14.
front surfaces of respective doors 10 to 14 are formed of a transparent front plate made of a glass plate or the like so as to further improve the design of the doors 10 to 14.
door 10 As an example, the configuration of door 10 is described with reference to FIGS. 3 to 8 .
Other doors 11 to 14 have the substantially same configuration as door 10.
inner box frame 23 is positioned in the inside of refrigerator body 1 in a state where door 10 is closed, and is made of an ABS resin, for example.
Edge frame 24 made of an ABS resin is joined and fixed to a peripheral end surface of inner box frame 23.
Transparent front plate 25 made of a glass plate or the like is stacked on edge frame 24 so as to cover inner box frame 23.
transparent front plate 25 is made of a glossy reinforced glass plate.
resin film 27 is laminated onto an inner surface of transparent front plate 25 with adhesive 26 interposed therebetween, and colored layer 28 with a picture pattern, for example, with a metallic pattern such as hairlines is formed on resin film 27.
transparent front plate 25 formed of a glass plate is a glass plate with a colored layer.
resin film 27 is made of polyethylene terephthalate having high transparency and high mechanical strength.
colored layer 28 is white or whitish, colored layer 28 is formed on a surface of resin film 27 on a side opposite to transparent front plate 25.
colored layer 28 is grey or greyish
colored layer 28 is formed on a surface of resin film 27 on a side of transparent front plate 25.
FIG. 5 shows the case where colored layer 28 is formed on the surface of resin film 27 on a side opposite to transparent front plate 25.
Rigid urethane foam 29 is filled and foamed in a space defined by a surface of transparent front plate 25 on a side of resin film 27 and inner box frame 23 to which edge frame 24 is joined and fixed.
Urethane foam 29 is bonded to resin film 27 formed on an inner surface of transparent front plate 25 together with inner box frame 23 and edge frame 24 so that transparent front plate 25 is bonded to and held by urethane foam 29 by way of resin film 27.
a foam density of urethane foam 29 at a portion corresponding to an outer periphery of transparent front plate 25 is set higher than a foam density of urethane foam 29 at a portion corresponding to a center portion of transparent front plate 25.
Edge frame 24 of inner box frame 23 and an outer periphery of transparent front plate 25 are bonded to each other by way of double-sided tape 30. Due to such bonding, transparent front plate 25 is bonded to and held by urethane foam 29 and, at the same time, is also bonded to and held by edge frame 24 by way of double-sided tape 30.
double-sided tape 30 includes: horizontal tape portions 30a positioned along upper and lower horizontal edge portions of transparent front plate 25; and vertical tape portions 30b positioned along left and right edge portions of transparent front plate 25.
Double-sided tape 30 is laminated onto edge frame 24 such that horizontal tape portions 30a substantially fully extend within a lateral width of transparent front plate 25, and a side edge of a short side of vertical tape portion 30b is made to abut on a side edge of a long side of horizontal tape portion 30a.
a tape bonding surface of edge frame 24 includes flat portions 24a positioned on an outer edge side of the edge frame, and a plurality of grooves 24b which are positioned on an inner edge side of the edge frame and open to the inner edge side of the edge frame.
Double-sided tape 30 is laminated onto edge frame 24 such that double-sided tape 30 extends over both flat portion 24a and grooves 24b.
inner side edge 30c extends beyond inner edge end 24e of edge frame 24 and extends to a bonded area between urethane foam 29 and resin film 27 so that double-sided tape 30 is positioned between urethane foam 29 and resin film 27.
edge frame 24 of inner box frame 23 does not include the colored transparent front plate insertion portion. That is, as shown in FIGS. 6 and 8 , transparent front plate 25 is configured such that an outer peripheral edge of transparent front plate 25 is merely positioned slightly inside end surface 24c of edge frame 24.
front plate support piece 24d which is brought into contact with a lower surface of transparent front plate 25 is provided with a size that front plate support piece 24d does not project frontward from a front surface of transparent front plate 25.
Front plate support piece 24d supports a weight of transparent front plate 25.
transparent front plate 25 is bonded to and held by urethane foam 29 and, at the same time, the outer periphery of transparent front plate 25 is bonded to edge frame 24 of inner box frame 23 by double-sided tape 30.
transparent front plate 25 is bonded also to edge frame 24 by way of double-sided tape 30 in addition to the bonding of transparent front plate 25 to urethane foam 29.
transparent front plate 25 with the colored layer to which resin film 27 is laminated is strongly bonded to and held by both urethane foam 29 and edge frame 24 so that the maintaining of the bonding strength of transparent front plate 25 can be guaranteed over a long period.
double-sided tape 30 allows the outer periphery of transparent front plate 25 to be bonded to edge frame 24 of inner box frame 23 and hence, it is also possible to prevent water splashed onto the door from intruding into the inside of the door from the edge portion of the door. Accordingly, it is also possible to prevent with certainty the peeling of bonding between urethane foam 29 and transparent front plate 25 caused by the intrusion of water and hence, the maintaining of the bonding of transparent front plate 25 can be guaranteed with certainty over a long period.
a temperature difference between the inside and the outside of the refrigerator is extremely large and hence, at the time of opening or closing the door, an end portion of transparent front plate 25 of the door is affected by dew condensation or an extremely large temperature change due to cool air flown out from the inside of the refrigerator.
the refrigerator is used such that a large impact is applied to the door at the time of opening or closing the door, or water or liquid overflows on the door including transparent front plate 25 at the time of taking out an article stored in the refrigerator or putting in an article into the refrigerator.
the transparent front plate insertion portion which covers an end portion of a transparent front plate is not provided, the end portion of transparent front plate 25 is placed under an environment where water or the like splashed to an edge portion of the door is liable to intrude into the inside of the door so that transparent front plate 25 is liable to be peeled from urethane foam 29.
transparent front plate 25 which constitutes the edge portion of the door and edge frame 24 of inner box frame 23 are bonded to each other by double-sided tape 30.
double-sided tape 30 With this configuration, the intrusion of water or the like into the inside of the door through a gap formed between transparent front plate 25 and edge frame 24 can be prevented with certainty by double-sided tape 30. Accordingly, it is possible to prevent the occurrence of the case where water or the like intrudes into the inside of the door from the edge portion of the door so that bonding between transparent front plate 25 and urethane foam 29 is peeled. Accordingly, it is possible to maintain and guarantee the bonding strength between transparent front plate 25 and urethane foam 29 over a long period.
double-sided tape 30 is disposed such that the side edge of the short side of vertical tape portion 30b is made to abut on the side edge of the long side of horizontal tape portion 30a disposed along upper and lower horizontal edge portions of transparent front plate 25. That is, even when the edge portion of the door is splashed with water, horizontal tape portion 30a of double-sided tape 30 is disposed continuously over the whole length of an upper portion of the door where water is particularly likely to intrude into the inside of the door easily due to gravity. Accordingly, the intrusion of water into the inside of the door can be prevented with certainty and hence, the reliability of maintaining the bonding of the transparent front plate 25 can be further enhanced.
the tape bonding surface of edge frame 24 of inner box frame 23 includes: flat portions 24a positioned on the outer edge side of the edge frame; and the plurality of grooves 24b which are positioned on the inner edge side of the edge frame and open to the inner edge side of the edge frame.
inner side edge 30c extends beyond inner edge end 24e of edge frame 24 and extends to a bonded area between urethane foam 29 and resin film 27.
colored layer 28 having a metallic pattern such as hairline is positioned inside the transparent layer formed of transparent front plate 25 and resin film 27.
the depth in color of the front plate is increased so that the design of the front plate is largely enhanced compared with a printed front plate made of metal or a resin.
colored layer 28 is formed on resin film 27 and hence, colored layer 28 can be formed by a roller or the like.
a fine pattern such as a hairline line pattern cannot be substantially acquired by a method where a colored layer is directly applied to transparent front plate 25 by silk screen printing because of a high defect ratio. According to the exemplary embodiment, such a fine pattern can be formed and hence, the design of transparent front plate 25 can be remarkably improved.
colored layer 28 can be formed by a roller or the like and hence, bonding strength with respect to resin film 27 can be controlled and guaranteed. Accordingly, even when a bonding state is deteriorated due to thermal shrinkage of urethane foam 29, changes with time or the like, it is possible to prevent peeling of colored layer 28 from resin film 27 with certainty.
a foam density of urethane foam 29 at a portion corresponding to the outer periphery of transparent front plate 25 is set higher than a foam density of urethane foam 29 at a portion corresponding to the center portion of transparent front plate 25. Accordingly, a bonding force of urethane foam 29 at the portion corresponding to the outer periphery of transparent front plate 25 becomes stronger than a bonding force of urethane foam 29 at the portion corresponding to the center portion of transparent front plate 25. Accordingly, the maintaining of a bonding force between resin film 27 of transparent front plate 25 and urethane foam 29 can be guaranteed with more certainty over a long period.
a foam density of urethane foam 29 is increased at the portion corresponding to the outer periphery of transparent front plate 25. That is, the outer periphery of transparent front plate 25 is bonded to a urethane skin layer where urethane is extremely finely foamed and hence, a bond density between urethane foam 29 and resin film 27 of transparent front plate 25 is high whereby the urethane foam 29 and resin film 27 of transparent front plate 25 are firmly bonded to each other.
a life acceleration test is carried out with respect to a bonding force between transparent front plate 25 and urethane foam 29.
a bonding force is set to 1.0g/cm 2 or more, preferably 2.6g/cm 2 or more, even when a bonding force is deteriorated due to changes with time such as thermal shrinkage or the like of urethane foam 29, the bonding strength between resin film 27 and urethane foam 29 can be guaranteed with certainty.
the maintaining of the bonding strength of transparent front plate 25 can be guaranteed over a long period.
a method of measuring the above-mentioned bonding force is based on "JIS K 6850 (Testing Methods for Strength Properties of Adhesives in Shear by Tension Loading)" which is a standard method of measuring overlapping shear adhesion strength of an adhesive.
resin film 27 is formed using a polyethylene terephthalate film.
Polyethylene terephthalate exhibits a high mechanical strength and hence, it is possible to prevent the occurrence of the case where resin film 27 per se is broken due to changes with time generated by thermal shrinkage of urethane foam 29, and peeling of bonding of resin film 27 to urethane foam 29 progresses with time from such a broken portion.
door 10 of this exemplary embodiment the maintaining of the bonding strength can be guaranteed as described above and hence, a conventional transparent front plate insertion portion or the like which covers a peripheral portion of transparent front plate 25 can be eliminated. Since the transparent front plate insertion portion is eliminated, there is no possibility that the design of the door is deteriorated by the transparent front plate insertion portion. Accordingly, the door can exhibit neat external appearance having flatness over the whole surface. Still further, the transparent front plate insertion portion is not provided and hence, unlike the conventional door, it is also possible to prevent the occurrence of the case where dirt, dust or the like sticks to or is accumulated in a boundary portion between the transparent front plate insertion portion and transparent front plate 25. Accordingly, the initial enhanced design can be maintained as it is over a long period.
front plate support piece 24d which is brought into contact with the lower surface of the transparent front plate is provided in a state where front plate support piece 24d does not project frontward from the front surface of transparent front plate 25.
the weight of transparent front plate 25 is supported by front plate support piece 24d of edge frame 24 of inner box frame 23. Accordingly, even when transparent front plate 25 is partially peeled due to the deterioration of a bonding force of transparent front plate 25 caused by urethane foam 29 by any chance, an abnormal state such as falling of transparent front plate 25 can be prevented with certainty.
front plate support piece 24d of edge frame 24 of inner box frame 23 does not project frontward from the front surface of transparent front plate 25. Accordingly, different from the transparent front plate insertion portion, there is no possibility that front plate support piece 24d is seen from a front surface of a door and hence, the design and the flatness over the whole surface can be favorably maintained.
an outer peripheral edge of transparent front plate 25 is positioned inside end surface 24c of edge frame 24 and hence, the outer peripheral edge of transparent front plate 25 is protected by end surface 24c of edge frame 24. Accordingly, for example, it is possible to also prevent the occurrence of the case where the outer peripheral edge of transparent front plate 25 hits an object and is broken at the time of conveying door 10 in a production line or at the time of exchanging door 10 at a residence of a user.
FIG. 9 is a cross-sectional view of a door of a refrigerator according to a second exemplary embodiment of the present invention.
a bonding force between resin film 27 of transparent front plate 25 and urethane foam 29 is further enhanced.
easily adhesive layer 32 is formed on a surface of resin film 27 on a side of urethane foam 29, and resin film 27 is bonded to urethane foam 29 by way of easily adhesive layer 32.
easily adhesive layer 32 may be formed by applying corona treatment or plasma treatment to a surface of resin film 27, or by applying a polyester resin or an acrylic resin to the surface of resin film 27.
the bonding strength can be increased by forming easily adhesive layer 32. That is, at the center portion of transparent front plate 25, a foam density of urethane is low so that a substantial bonding area between urethane foam 29 and resin film 27 is decreased. Fortunately adhesive layer 32 compensates for an amount of bonding strength corresponding to the decrease of the bonding area and hence, it is possible to acquire a bonding strength between urethane foam 29 and resin film 27 with more certainty. Eventually, the maintaining of the bonding strength of transparent front plate 25 can be guaranteed over a long period.
a solubility parameter (hereinafter referred to as an SP value) of polyester which constitutes a polyester adhesive is close to 10 to 11 which is an SP value of urethane or 11.3 which is an SP value of polyethylene terephthalate used as a material for forming a resin film. Accordingly, a bonding force between resin film 27 and urethane foam 29 becomes stronger and hence, the high bonding strength can be maintained.
-OH group is reacted with isocyanate at a terminal of a polyester resin (the same also applies to an acrylic resin) thus forming a urethane modified resin film.
a urethane foam material is formed by curing isocyanate of polyetherpolyol.
the polyester resin and the urethane foam material have different basic resin skeletons, these materials have the same content of reaction and hence, a bonding strength is enhanced. Accordingly, the maintaining of a bonding strength of transparent front plate 25 can be guaranteed over a long period.
transparent front plate 25 may be replaced with a transparent resin plate.
transparent front plate 25 with a colored layer is formed by laminating resin film 27 with a colored layer to transparent front plate 25.
transparent front plate 25 with a colored layer may be formed by directly forming a colored layer on transparent front plate 25 by eliminating resin film 27.
colored layer 28 of resin film 27 may be formed on a surface of resin film 27 on a side of transparent front plate 25.
a urethane binder or a vapor deposition layer may be used as easily adhesive layer 32 for enhancing a bonding strength between resin film 27 and urethane foam 29.
a vapor deposition layer, a urethane binder or both a vapor deposition layer and a urethane binder may be interposed between easily adhesive layer 32 and urethane foam 29.
a bonding strength or the design of a colored layer can be enhanced by using them depending on a purpose of use.
FIG. 10 is a cross-sectional view of door 10 of a refrigerator according to the third exemplary embodiment of the present invention including an enlarged view of an essential part.
a bonding force between resin film 27 of transparent front plate 25 and urethane foam 29 of door 10 is further enhanced.
Transparent front plate 25 is made of a glass plate.
adhesive 26a is also applied to a surface of resin film 27 on a side of urethane foam, urethane is filled and foamed on adhesive 26a, and resin film 27 and urethane foam 29 are bonded to each other by way of adhesive 26a.
the solubility parameter of urethane is close to 10 to 11 which is an SP value of urethane.
an SP value is close to 11.3 which is an SP value of polyethylene terephthalate used as a material for forming a resin film. Accordingly, a bonding force between resin film 27 and urethane foam 29 becomes stronger and hence, the high bonding strength can be maintained.
-OH group is reacted with isocyanate at a terminal of a polyester resin (the same also applies to an acrylic resin) thus forming a urethane modified resin film.
a urethane foam material is formed by curing isocyanate of polyetherpolyol.
front plate support piece 24d is provided to a portion of edge frame 24 of inner box frame 23 at a position corresponding to a lower surface of transparent front plate 25.
Front plate support piece 24d has a size that front plate support piece 24d does not project frontward from a front surface of transparent front plate 25.
Front plate support piece 24d is brought into contact with the lower surface of transparent front plate 25 with a projecting margin within 2 mm frontward from the front surface of edge frame 24.
Front plate support piece 24d supports a weight of transparent front plate 25.
front plate support piece 24d of edge frame 24 of inner box frame 23 the weight of transparent front plate 25 is supported by front plate support piece 24d of edge frame 24 of inner box frame 23. Accordingly, even when transparent front plate 25 is partially peeled due to the deterioration of a bonding force of transparent front plate 25 caused by urethane foam 29 by any chance, an abnormal state such as falling of transparent front plate 25 can be prevented with certainty. Further, front plate support piece 24d of edge frame 24 of inner box frame 23 does not project frontward from the front surface of transparent front plate 25. Accordingly, different from the transparent front plate insertion portion, there is no possibility that front plate support piece 24d is seen from a front surface of a door and hence, the design and the flatness over the whole surface can be favorably maintained.
resin film 27 is laminated onto transparent front plate 25 by means of adhesive 26, and colored layer 28 with a picture pattern, for example, a metallic pattern such as hairlines is formed on resin film 27.
transparent front plate 25 is a transparent front plate with a colored layer.
resin film 27 is made of polyethylene terephthalate having high transparency and a high mechanical strength.
colored layer 28 is white or whitish, colored layer 28 is formed on a surface of resin film 27 on a side opposite to transparent front plate 25.
colored layer 28 is grey or greyish, colored layer 28 is formed on a surface of resin film 27 on a side of transparent front plate 25.
FIG. 10 shows a state where colored layer 28 is formed on a surface of resin film 27 on a side opposite to transparent front plate 25.
adhesive 26a is applied to a surface of resin film 27 on a side of urethane foam 29.
a double-sided tape is not provided for bonding transparent front plate 25 and edge frame 24 of inner box frame 23 to each other.
double-sided tape 30 may be provided for bonding transparent front plate 25 and edge frame 24 of inner box frame 23 to each other as shown in FIG. 9 .
easily adhesive layer 32a is formed on a surface of resin film 27 on a side of urethane foam, and resin film 27 is bonded to urethane foam 29 by way of easily adhesive layer 32a.
easily adhesive layer 32a is formed by applying corona treatment or plasma treatment to a surface of resin film 27, or by applying a urethane resin or a polyester resin or an acrylic resin to the surface of resin film 27.
easily adhesive layer 32a is formed by applying a polyester adhesive.
a bonding strength between resin film 27 and urethane foam 29 is further increased. Accordingly, it is possible to prevent with certainty peeling of resin film 27 from urethane foam 29 and, eventually, peeling of transparent front plate 25. Accordingly, the maintaining of a bonding strength of transparent front plate 25 with resin film 27 can be guaranteed over a long period.
a bonding strength becomes extremely strong. That is, a solubility parameter (hereinafter referred to as an SP value) of polyester for forming the polyester adhesive is close to 10 to 11 which is an SP value of urethane and 11.3 which is an SP value of polyethylene terephthalate which is a material for forming a resin film. Accordingly, resin film 27 and urethane foam 29 are firmly bonded to each other.
an SP value solubility parameter
-OH group is reacted with isocyanate at a terminal of a polyester resin (the same also applies to acrylic resin) thus forming a urethane modified resin film.
a urethane foam material is formed by curing isocyanate of polyetherpolyol.
easily adhesive layer 32a is formed at a bonding surface between resin film 27 and urethane foam 29 and hence, it is possible to acquire a high bonding strength between resin film 27 and urethane foam 29. Accordingly, it is possible to prevent the spreading of peeling between the skin layer of urethane foam 29 and resin film 27. Thus, the maintaining of a bonding strength between resin film 27 on the inner surface of transparent front plate 25 and urethane foam 29 can be guaranteed over a long period.
a bonding strength between urethane foam 29 and resin film 27 can be enhanced by forming easily adhesive layer 32a. That is, at a center portion of transparent front plate 25, a foam density of urethane is low so that a substantial bonding area between urethane foam 29 and resin film 27 is decreased. Fortunately adhesive layer 32a compensates for an amount of bonding strength corresponding to the decrease of the bonding area and hence, it is possible to acquire a bonding strength between urethane foam 29 and resin film 27 with more certainty. Eventually, the maintaining of the bonding strength of transparent front plate 25 can be guaranteed over a long period.
easily adhesive layer 32a is formed on a surface of resin film 27 on a side of urethane foam 29.
a double-sided tape is not provided for bonding transparent front plate 25 and edge frame 24 of inner box frame 23 to each other.
double-sided tape 30 may be provided for bonding transparent front plate 25 and edge frame 24 of inner box frame 23 to each other as shown in FIG. 9 .
FIG. 12 is a schematic view showing components of a door of a refrigerator according to this exemplary embodiment.
transparent front plate 25 which constitutes the door of the refrigerator according to this exemplary embodiment, to prevent peeling of transparent front plate 25 attributed to a colored layer, resin film 27 is bonded to an inner surface of transparent front plate 25 with adhesive 26 interposed therebetween.
Colored layer 28a is formed on a surface of resin film 27 on a side of transparent front plate 25, and hairlines 28b are formed on a surface of resin film 27 on a side opposite to the transparent front plate 25, that is, on a side of urethane foam 29.
transparent front plate 25 is a colored transparent front plate with hairlines.
colored layer 28a may be formed on a surface of resin film 27 on a side opposite to transparent front plate 25.
an outer periphery of resin film 27 mounted on an inner surface of transparent front plate 25 by means of adhesive 26 and an edge frame of an inner box frame are bonded to each other by way of double-sided tape 30.
oxidation auxiliary agent 31 made of titanium oxide or the like is added to the outer periphery of resin film 27.
transparent front plate 25 is firmly bonded to and held by urethane foam 29 and, at the same time, is also bonded to and held by the edge frame using double-sided tape 30.
Double-sided tape 30 provided for enhancing a bonding strength of transparent front plate 25 has a relatively weak bonding strength to resin film 27. Accordingly, so long as double-sided tape 30 is used as it is, there is a possibility that double-sided tape 30 per se will be peeled from resin film 27 at the time of peeling a peel-off sheet from double-sided tape 30. In this case, the operability is lowered. However, in this exemplary embodiment, by adding oxidation auxiliary agent 31 to the surface of resin film 27 to which double-sided tape 30 is bonded, the bonding between double-sided tape 30 and resin film 27 becomes strong bonding accompanying the hydrogen bonding.
FIG. 13 is a schematic view showing the components of the door of the refrigerator according to this exemplary embodiment.
transparent front plate 25 which constitutes the door of the refrigerator according to this exemplary embodiment, to prevent peeling of transparent front plate 25 attributed to a colored layer, resin film 27 is bonded to an inner surface of transparent front plate 25 with adhesive 26 interposed therebetween. Colored layer 28a is formed on a surface of resin film 27 on a side of transparent front plate 25, and hairlines 28b are formed on a surface of resin film 27 on a side opposite to the transparent front plate 25, that is, on a side of urethane foam 29. Thus, it appears as if transparent front plate 25 is a colored transparent front plate with hairlines.
urethane foam 29 is bonded to the outer periphery of transparent front plate 25 by way of double-sided tape 30.
transparent front plate 25 is bonded to and held on urethane foam 29 and, at the same time, is also bonded to and held on edge frame 24 of inner box frame 23 by double-sided tape 30.
double-sided tape 30 is formed of horizontal tape portions 30a positioned along upper and lower horizontal edge portions of transparent front plate 25, and vertical tape portions 30b positioned along left and right edge portions of transparent front plate 25.
Double-sided tape 30 is bonded to resin film 27 on which hairlines 28b are formed as shown in FIG. 13 with an arrangement where horizontal tape portions 30a substantially fully extend within a lateral width of transparent front plate 25, and a side edge of a short side of vertical tape portion 30b is made to abut on a side edge of a long side of horizontal tape portions 30a.
tape inner edge end 30c extends beyond inner edge end 24e of edge frame 24 and extends to a bonded area between urethane foam 29 at the position close to the center portion and resin film 27 so that inner side edge 30c is positioned between urethane foam 29 and resin film 27.
reinforcing layer 33 is provided between double-sided tape 30 and resin film 27.
Reinforcing layer 33 suppresses a local unbalanced load generated by a foaming pressure which is exert on resin film 27 by urethane foam 29 by way of inner side edge 30c of double-sided tape 30.
Reinforcing layer 33 is formed of a transparent resin film made of polyethylene terephthalate having high transparency and a high mechanical strength.
reinforcing layer 33 is formed on a surface of resin film 27 to which hairline processing is applied on a side of urethane foam 29.
double-sided tape 30 extends to the bonded area between urethane foam 29 and resin film 27. Due to such protrusion of double-sided tape 30, a foaming pressure of urethane foam 29 is locally applied to resin film 27 by way of inner side edge 30c of double-sided tape 30. Due to such a local unbalanced load, a line flaw which traverses hairlines 28b is generated along inner side edge 30c of double-sided tape 30. The reason of the generation of the line flaw is considered as follows.
a portion corresponding to inner side edge 30c is deformed (depths of grooves of hairlines 28b being changed) due to a local unbalanced load applied to inner side edge 30c which is positioned so as to traverse hairlines 28b so that reflection of light is changed.
reinforcing layer 33 is provided between inner side edge 30c of double-sided tape 30 which receives a local unbalanced load and resin film 27 and hence, reinforcing layer 33 alleviates and suppresses the local unbalanced load from inner side edge 30c generated by the foaming pressure.
reinforcing layer 33 alleviates and suppresses the local unbalanced load from inner side edge 30c generated by the foaming pressure.
the deformation of hairlines 28b which may be generated along inner side edge 30c is not generated so that it is possible to prevent the generation of a line flaw which traverses hairlines 28b.
this exemplary embodiment can secure the favorable design by overcoming drawbacks relating to the lack of design which is brought about by the enhancement of a bonding strength of transparent front plate 25 by providing double-sided tape 30.
FIG. 16 is a schematic view showing components of a door of a refrigerator according to this exemplary embodiment.
a bonding force between resin film 27 of transparent front plate 25 and urethane foam 29 is further enhanced.
easily adhesive layer 32 is formed on a surface of resin film 27 on a side of urethane foam so that resin film 27 is bonded to urethane foam 29 by way of easily adhesive layer 32.
easily adhesive layer 32 may be formed by applying corona treatment or plasma treatment to a surface of resin film 27, or by applying a polyester resin or an acrylic resin to the surface of resin film 27.
easily adhesive layer 32 is formed using an adhesive.
the adhesive When the adhesive is cured by drying, the adhesive forms a layer having high strength. Cured easily adhesive layer 32 forms a reinforcing layer. Accordingly, easily adhesive layer 32 prevents the generation of a line which traverses hairlines 28b generated by inner side edge 30c of double-sided tape 30.
easily adhesive layer 32 is formed using an adhesive.
the adhesive When the adhesive is cured by drying, the adhesive forms a layer having a high strength. Cured easily adhesive layer 32 forms an additional reinforcing layer as shown in FIG. 14 . Accordingly, easily adhesive layer 32 can prevent with more certainty the generation of a line which traverses hairlines 28b generated by inner side edge 30c of double-sided tape 30.
the refrigerator includes; a refrigerator body having heat insulating properties; and the door, wherein the door includes: the inner box frame which is positioned inside the refrigerator body in a state where the door is closed; the transparent front plate disposed on the edge frame of the inner box frame such that the front plate covers the inner box frame, the transparent front plate having the colored layer; and the urethane foam filled and foamed in the space defined by the transparent front plate and the inner box frame.
the transparent front plate is bonded to and held by the urethane foam, and the outer periphery of the transparent front plate is bonded to the edge frame of the inner box frame with a double-sided tape.
the transparent front plate is also bonded to and held by the edge frame of the inner box frame by way of the double-sided tape and hence, the transparent front plate is bonded and held more firmly. Further, even when the edge portion of the door is splashed with water, the intrusion of water into the inside of the door is prevented by the double-sided tape which provides an adhesive between the transparent front plate and the edge portion of the inner box frame and hence, it is possible to prevent with certainty the peeling of an adhesive between the urethane foam and the transparent front plate due to the intrusion of water. Accordingly, the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
the transparent front plate has the colored layer and hence, the transparent front plate can have the external appearance with the depth in color whereby the design of the door can be enhanced.
the transparent front plate insertion portion which covers the peripheral portion of the transparent front plate is eliminated and hence, there is no possibility that the design of the door is deteriorated by the transparent front plate insertion portion whereby the door can exhibit neat external appearance having flatness over the whole surface.
the transparent front plate insertion portion is not provided, it is possible to prevent the occurrence of the case where dirt, dust or the like sticks to or accumulates in a boundary portion between the transparent front plate insertion portion and the transparent front plate. Accordingly, the initial enhanced design can be maintained as it is over a long period.
the transparent front plate with the colored layer may be formed by laminating the resin film on which the colored layer such as a pattern is formed to the inner surface of the transparent front plate by means of an adhesive.
the colored layer is formed on the resin film and hence, the colored layer can be formed by a roller or the like whereby a bonding strength of the colored layer to the resin film can be guaranteed thus preventing the peeling of the resin film with certainty. Accordingly, it is possible to prevent the occurrence of a phenomenon that when the resin film is interposed between the transparent front plate and the urethane foam, the colored layer is peeled from the film and the transparent front plate is peeled from the urethane foam due to the peeling of the colored layer from the resin film. Accordingly, the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
the transparent front plate is formed of a glass plate and the transparent front plate is broken due to some reason, a piece of glass is bonded to the resin film so that the scattering of the piece of glass can be prevented and safety of transparent front plate can be also enhanced.
the colored layer such as a pattern is formed on the resin film inside the transparent front plate and hence, a fine pattern such as a hairline pattern which cannot be expressed by a method where a pattern is directly formed by printing on the transparent front plate can be also formed so that design of the door can be remarkably improved.
the double-sided tape which provides an adhesive between the transparent front plate and the edge frame of the inner box frame may be made of the horizontal tape portions disposed along upper and lower horizontal edge portions of the transparent front plate and the vertical tape portions disposed along left and right edge portions of the transparent front plate. Further, in this double-sided tape, the surface of the short side of the horizontal tape portion is made to abut on the surface of the long side of the horizontal tape portion.
the double-sided tape may be provided such that the inner side edge of the double-sided tape extends to the bonded area between the urethane foam and the resin film exceeding the inner edge end of the edge frame.
the urethane foam is thermally shrunken, it is possible to prevent peeling or tearing of the resin film at a portion corresponding to the inner edge end of the edge frame of the urethane foam due to a peeling-by-pulling force generated by the thermal shrinkage. Accordingly, the reliability of maintaining bonding of the transparent front plate can be enhanced and, at the same time, the design of the door can be maintained in a favorable state.
the double-sided tape may be provided such that outer side edge of the double-sided tape are positioned within 5mm from outer edge ends of the transparent front plate.
the transparent front plate is formed of a glass plate
a broken piece is bonded to the double-sided tape and hence, scattering of the broken piece can be prevented whereby the safety can be enhanced in such a worst case.
the tape bonding surface of the edge frame of the inner box frame may include: the flat portion positioned on the outer peripheral side; and the plurality of grooves positioned on the inner peripheral side and opened in the inner peripheral side.
foam density of the urethane foam at a portion corresponding to the outer periphery of the transparent front plate is set higher than foam density of the urethane foam at a portion corresponding to a center portion of the transparent front plate.
the outer periphery of the film of the transparent front plate is bonded to the skin layer of the urethane foam having high foam density and hence, a bond density between the outer periphery of the film and the skin layer is high whereby the outer periphery of the film and the skin layer are firmly bonded to each other. Accordingly, even when the refrigerator is used over a long period, the bonding between the resin film of the transparent front plate and urethane foam is maintained and hence, the maintaining of the bonding strength of the transparent front plate with a resin film can be guaranteed over a long period.
a bonding strength between the resin film and the urethane foam may be set to at least 1.0g/cm 2 or more.
the bonding strength between the resin film and the urethane foam can be guaranteed with certainty and hence, the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
the resin film which is laminated to the inner box frame side of the transparent front plate by means of an adhesive and on which the colored layer is formed may be bonded to the urethane foam by interposing an adhesive between a surface of the resin film on a side of urethane foam and urethane foam.
a bonding strength between the resin film and the urethane foam can be increased.
the bonding strength between the resin film and the urethane foam can be secured with more certainty by a bonding force of the adhesive by an amount corresponding to the decrease of a substantial bonding area between the urethane foam and the resin film due to foaming of urethane, and the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
the resin film may be formed of a polyethylene terephthalate film
the adhesive which bonds the resin film and the urethane foam to each other may be formed of a urethane adhesive or a polyester adhesive.
Polyethylene terephthalate has a high mechanical strength and hence, there is no possibility that the resin film per se will be broken due to changes with time brought about by thermal shrinkage of urethane foam. Further, the dissolution parameter of polyethylene terephthalate, the dissolution parameter of urethane and the dissolution parameter of polyester are similar to each other and hence, an inter bonding force between the resin film, urethane foam and the adhesive becomes strong whereby the guarantee of maintaining the bonding strength can be further enhanced.
the front plate support piece which is brought into contact with the lower surface of the transparent front plate may be provided in a state where the front plate support piece does not project frontward from the front surface of the transparent front plate.
the weight of the transparent front plate is supported by the front plate support piece of the inner box frame and hence, an abnormal state such as falling of the transparent front plate can be prevented with certainty. Further, the front plate support piece does not project frontward from the front surface of the transparent front plate and hence, the design and the flatness over the whole surface can be favorably maintained.
the chromium vapor-deposited layer may be formed on the resin film.
the easily adhesive layer may be formed on the surface of the resin film on a side of urethane foam.
the bonding strength between the resin film and the urethane foam is further increased and hence, peeling between the resin film and the urethane foam can be prevented. Accordingly, the maintaining of the bonding strength of the transparent front plate can be guaranteed over a long period.
an oxidation auxiliary agent may be added to the surface of the colored resin film to which the double-sided tape is bonded.
the double-sided tape provided for enhancing the bonding strength has a relatively weak bonding strength to the resin film and hence, so long as the double-sided tape is used as it is, there is a possibility that the double-sided tape will be peeled from the resin film at the time of peeling a peel-off sheet from the double-sided tape. In this case, the operability is lowered.
an oxidation auxiliary agent to the surface of the resin film to which the double-sided tape is bonded, the bonding between the double-sided tape and the resin film becomes strong bonding accompanying the hydrogen bonding.
hairline processing may be applied to the resin film, and the reinforcing layer which suppresses a local unbalanced load exerted on the resin film by the urethane foam by way of the inner edge end of the double-sided tape may be provided to a surface of the resin film on a side of urethane foam.
the reinforcing layer By providing the reinforcing layer to the surface of the resin film on a side of urethane foam to which hairline processing is applied, it is possible to suppress a local unbalanced load generated by a foaming pressure of the urethane foam applied to the resin film by way of the inner edge end of the double-sided tape projecting to the bonding surface between the urethane foam and the resin film. Further, it is possible to prevent the generation of a line flaw which may be generated in such a manner that the line flaw traverses the hairline along the inner edge end of the double-bonded tape due to the local unbalanced load thus maintaining the hairline in a non-flaw state.
the reinforcing layer may be disposed between the resin film and the double-sided tape.
the reinforcing layer may be disposed between the double-sided tape and the urethane foam.
a foaming pressure per se applied to the inner edge end of the double-sided tape can be reduced and hence, the generation of a line flaw on the hairline can be prevented.
the reinforcing layer may be formed of a transparent resin film.
the reinforcing layer can be simply formed by merely mounting the transparent resin film.
the reinforcing layer may be formed of a cured layer of the adhesive applied to the inner surface of the resin film.
the reinforcing layer can be formed by applying the adhesive to the resin film and by curing the applied adhesive.
a transparent front plate of a door can be bonded and held over a long period and, at the same time, design of the transparent front plate can be enhanced, and the enhanced design can be maintained as it is. Accordingly, the present invention is applicable to refrigerators for business use and wine coolers, not to mention refrigerators for household use.

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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)
Refrigerator Housings (AREA)

EP13834782.8A 2012-09-10 2013-09-04 Réfrigérateur Not-in-force EP2894423B1 (fr)

Applications Claiming Priority (6)

Application Number	Priority Date	Filing Date	Title
JP2012198238A JP5532092B2 (ja)	2012-09-10	2012-09-10	冷蔵庫
JP2012198237A JP6167277B2 (ja)	2012-09-10	2012-09-10	冷蔵庫
JP2012198239A JP6236619B2 (ja)	2012-09-10	2012-09-10	冷蔵庫
JP2013119502A JP6043961B2 (ja)	2013-06-06	2013-06-06	冷蔵庫
JP2013119503A JP6089213B2 (ja)	2013-06-06	2013-06-06	冷蔵庫
PCT/JP2013/005219 WO2014038189A1 (fr)	2012-09-10	2013-09-04	Réfrigérateur

Publications (3)

Publication Number	Publication Date
EP2894423A1 true EP2894423A1 (fr)	2015-07-15
EP2894423A4 EP2894423A4 (fr)	2016-04-27
EP2894423B1 EP2894423B1 (fr)	2017-11-29

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EP13834782.8A Not-in-force EP2894423B1 (fr)	2012-09-10	2013-09-04	Réfrigérateur

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EP (1)	EP2894423B1 (fr)
CN (1)	CN104620066B (fr)
WO (1)	WO2014038189A1 (fr)

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JP6214485B2 (ja) *	2014-07-11	2017-10-18	三菱電機株式会社	冷蔵庫
JP6761936B2 (ja) *	2016-06-27	2020-09-30	パナソニックＩｐマネジメント株式会社	冷蔵庫

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* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPH05322436A (ja) *	1992-05-26	1993-12-07	Matsushita Refrig Co Ltd	断熱扉
JPH09100443A (ja) *	1995-10-05	1997-04-15	Nissan Motor Co Ltd	自動車用塗料組成物
JP2000171148A (ja) *	1998-12-08	2000-06-23	Hitachi Ltd	保冷装置
KR100402604B1 (ko) *	2001-09-07	2003-10-17	주식회사 엘지이아이	냉장고 도어의 외장재
JP4123991B2 (ja) *	2003-03-14	2008-07-23	松下電器産業株式会社	断熱扉の製造方法および冷蔵庫
KR101307862B1 (ko) *	2008-08-05	2013-09-12	삼성전자주식회사	냉장고 도어 및 냉장고 도어의 제조 방법
JP2010060190A (ja) *	2008-09-03	2010-03-18	Hitachi Appliances Inc	冷蔵庫
KR20110042786A (ko) *	2009-10-20	2011-04-27	삼성전자주식회사	냉장고 및 냉장고의 제조 방법

2013
- 2013-09-04 EP EP13834782.8A patent/EP2894423B1/fr not_active Not-in-force
- 2013-09-04 CN CN201380047055.1A patent/CN104620066B/zh active Active
- 2013-09-04 WO PCT/JP2013/005219 patent/WO2014038189A1/fr active Application Filing

Also Published As

Publication number	Publication date
CN104620066B (zh)	2016-08-24
EP2894423A4 (fr)	2016-04-27
EP2894423B1 (fr)	2017-11-29
WO2014038189A1 (fr)	2014-03-13
CN104620066A (zh)	2015-05-13

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