JP6704243B2 - Refrigerator door - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door body of a device for keeping heat, and more particularly to a door body of a refrigerator for opening and closing a front opening of a refrigerator body having a refrigerating room and a freezing room.

The door body of the refrigerator that opens and closes the front opening of the refrigerator body is a relatively heavy article and requires sufficient strength and rigidity. Therefore, conventionally, a steel plate is used as a member that forms the front panel (for example, Recently, glass and the like having excellent design have been used.

JP, 2003-83671, A

However, the use of glass as a member forming the front panel causes a problem that the glass becomes heavy and it is necessary to separate the glass from other members of the door at the time of recycling, which is troublesome.

Therefore, an object of the present invention is to provide a refrigerator door body which is lightweight, excellent in recyclability, and excellent in heat insulation.

Therefore, in the present invention, a front panel forming a front surface, a frame body supporting at least a part of an outer end portion of the front panel, a back panel forming a back surface, the front panel, the frame body, and the A resin door having a thickness of 0.1 mm or more and 10 mm or less, which is a door body of a refrigerator in which a space formed with a back panel is filled with a heat insulating material and which opens and closes a front opening of a refrigerator body. It is characterized in that it is configured with.

According to one embodiment of the present invention, it is possible to provide a refrigerator door body that is lightweight, has excellent recyclability, and has excellent heat insulating properties.

According to another aspect of the present invention, it is possible to provide a door body of a refrigerator which has excellent designability and high workability.

Other objects, features and advantages of the present invention will become apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a perspective view of a refrigerator. It is a disassembled perspective view of the freezer compartment door of 1st Embodiment. It is a vertical side view of the freezer compartment door of 1st Embodiment. It is a partial horizontal sectional view of a freezer compartment door of a 1st embodiment. It is the perspective view which looked at the freezer compartment door of a 1st embodiment from the back. It is a disassembled perspective view of the freezer compartment door of 2nd Embodiment. It is a vertical side view of the freezer compartment door of 2nd Embodiment. It is a partial horizontal sectional view of a freezer compartment door of a 2nd embodiment. It is a partial expanded view of a part of horizontal partial sectional view of the freezer compartment door of 2nd Embodiment. It is the perspective view which looked at the freezer compartment door of a 2nd embodiment from the back.

Embodiments of the present invention will be described below with reference to the drawings. First, in FIG. 1, which is a perspective view of a freezer-refrigerator, reference numeral 1 denotes a freezer-refrigerator main body including a plurality of food storage rooms each provided with a front door. The inside of the freezer-refrigerator main body 1 is partitioned by a partition wall (not shown) having a heat insulating function, and a refrigerating chamber 2 is provided at the uppermost portion, that is, an uppermost stage, and an ice making chamber 3 and a storage temperature switching chamber 4 are provided on the left and right sides. They are arranged side by side, the freezing compartment 5 is arranged below the freezing compartment, and the vegetable compartment 6 is arranged at the lowermost portion below the freezing compartment 5.

The freezer-refrigerator body 1 is a foamed heat insulating material by an in-situ foaming method in which a stock solution of a foaming resin is injected between an outer box made of a steel plate having an opening at the front and an inner box made of a hard synthetic resin having an opening at the front as well. It is composed of an insulating box body filled with.

A plurality of upper and lower shelves are arranged in the refrigerating compartment 2, and a front opening of the refrigerating compartment 2 is pivoted by upper and lower hinges to be opened and closed by two left and right doors of a double door type. Can be closed by. The refrigerator compartment 2 is the ice making compartment 3, the temperature switching compartment 4, the freezing compartment 5, and the vegetable compartment 6 is a drawer type ice making compartment door 9, a temperature switching compartment door 10, a freezing compartment door 11, and vegetables. Each of the chamber doors 12 is closed.

The bottom wall of the heat-insulating box is shaped such that the rear part thereof rises stepwise, and a cooling machine room is formed below and below the bottom wall. A compressor constituting a refrigeration cycle and a condenser as a radiator are installed in this machine room, and the cool air generated by the cooler by the operation of the compressor is blown into each of the storage chambers through each outlet. It is supplied and kept at refrigerating temperature and freezing temperature, respectively.

The present invention can be applied to the refrigerating compartment door 8, the drawer type ice making compartment door 9, the temperature switching compartment door 10, the freezing compartment door 11 and the vegetable compartment door 12, but the freezing compartment door 11 is used. A typical example will be described below.

As shown in FIG. 2, which is an exploded perspective view, the freezer compartment door 11 is roughly divided into the front surface of the freezer compartment door 11, and is a resin sheet (resin having a thickness of 0.1 mm to 10 mm). A front panel 15 made of a flexible plate material, and a frame body made of a synthetic resin material that is attached to the upper and lower parts of the front panel 15 to support the front panel 15. A gasket 19 having door caps 16 and 17 and a reinforcing body 23 made of a synthetic resin material attached to the front surface, a storage container (not shown) attached to the back surface, and a magnet 18 for sealing on the peripheral portion. A front panel 15 and the front panel 15 and the door cap 16, which are attached and fixed so as to cover the openings of the front panel 15 and the door caps 16 and 17 to form the rear surface of the freezer compartment door 11. It is composed of a foamed heat insulating material 22 and the like filled in the space between 17 and the back panel 20 by an in-situ foaming method.

The resin sheet may be a synthetic resin material, a natural resin material such as a cellulosic material, a thermoplastic resin, or a curable resin (thermosetting, photocurable, water-curable resin, etc.), and further hard A resin or a soft resin may be used, and the manufacturing method thereof is not limited, but in the first embodiment of the freezer compartment door 11, it is made of a thermoplastic synthetic resin material.

The front panel 15 preferably has a thickness of 0.1 to 10 mm as described above. When the thickness is less than 0.1 mm, the strength of the front panel 15 itself decreases, and the front panel 15 is likely to be deformed (compositional distortion) due to pressure from the outside or inside of the freezer. On the other hand, if the resin sheet is thicker than 10 mm, the manufacturability of the front panel 15 itself (such as uniformly cooling and solidifying without distortion) and workability such as bending are deteriorated.

The resin sheet is cut into an appropriate size, and for use in the front panel 15, the resin sheet is punched into a predetermined size. The resin sheet having a predetermined size as described above is formed into an appropriate shape for use as the front panel 15 by an appropriate method or means. That is, pressure molding is performed while heating by a heat press molding method using a molding jig to mold the flat resin sheet for use as the front panel 15, the front surface 15A and the front surface 15A. To form right and left side surfaces 15B, and both side surfaces 15B are bent inward at substantially right angles to form an inner flange 15C.

Since the front panel 15 is made of a resin sheet, it has characteristics that it has better heat insulating properties and is lighter than conventional ones made of iron or glass. For this reason, the door of the refrigerator can be made thin, and if the entire appearance of the refrigerator is the same size, the storage capacity in the refrigerator can be expanded.

The door cap 17 attached to the lower portion of the front panel 15 has a substantially rectangular plate shape, and the lower end portion of the front panel 15 is provided between the peripheral edges of the front side and both side edges except the rear side. The rising pieces 17A and 17B are erected so as to form a groove into which is inserted. A rising piece 17C is erected on the rear side so that a locking member with which a flange 20A formed on the peripheral edge of the back panel 20 abuts is formed.

The door cap 16 attached to the upper portion of the front panel 15 forms a handle for pulling the freezer compartment door 11 forward. The door cap 16 includes a lower frame body 16A attached to the front panel 15 and an upper frame body 16B attached to the lower frame body 16A. As described above, the door cap 16 is not limited to the case where the lower frame body 16A and the upper frame body 16B different from the lower frame body 16A are attached, and the door cap 16 may have an integrated structure from the beginning.

The lower frame 16A is provided with a falling piece 16A1 at the peripheral edges of the front surface and the lower ends of both side surfaces so that a groove into which the upper end of the front panel 15 is inserted is formed. A down piece 16A2 and both side surfaces 16A3 are provided. A locking portion 16A41 is formed at the upper end of the curved front surface 16A4 and a locking portion 16A6 is formed at the rear end of the upper surface 16A5 so as to form the space S for holding.

The upper frame 16B has a generally L-shaped vertical cross section, and includes an upper surface 16B1 and a front surface 16B2 that form the space S for holding. Further, an intermediate portion of the lower surface of the upper surface 16B1 is engaged with an engaging portion 16B11 and an engaging portion 16A6 which are engaged with the engaging portion 16A41 when the upper frame body 16B is attached to the lower frame body 16A. The locking portion 16B12 is formed.

Further, on both sides of the front surface 16B2, when the upper frame body 16B is attached to the lower frame body 16A, a locking portion 16B3 that abuts and locks on the inner side surfaces of the both side surfaces 16A3 of the lower frame body 16A. Are formed.

A flange 20</b>A is formed at the peripheral edge of the back panel 20. The back panel 20, the flange 20A, the door cap 16, so that the flange 20A abuts on the locking member of the door cap 17, both inner flanges 15C of the front panel 15 and the locking portion 16B12 of the upper frame 16B. 17 and the front panel 15.

As described above, the recess (groove) 20B for mounting the gasket 19 with the magnet 18 is formed in a continuous state with the peripheral portion of the back panel 20. The magnet 18 closes the front opening of the freezer/refrigerator main body 1 when it is attracted to the front end of the outer casing made of steel plate of the freezer/refrigerator main body 1.

The freezer compartment door 11 is a state in which the door caps 16 and 17 are attached to the upper and lower portions of the front panel 15 and the gasket 19 with the magnet 18 to which the reinforcing body 23 is attached is attached to the rear panel 20. Then, for example, it is formed by injecting a stock solution of a foaming resin into the space defined by the front panel 15, the door caps 16 and 17 and the back panel 20 and filling the foam heat insulating material 22 by an in-situ foaming method. To be done.

The attachment and fixing of each member when forming the foamed heat insulating material 22 is performed by fitting each portion or adhering with an adhesive or a double-sided adhesive tape. Moreover, at the time of injecting the undiluted solution of the foamable resin, the entire outer shape of the freezer compartment door 11 with the above-mentioned members attached and fixed is pressed and fixed by the foaming jig for receiving the foaming pressure. When the foam heat insulating material 22 is formed by the liquid foaming and hardening, the front panel 15, the door caps 16 and 17, and the rear panel 20 are firmly integrated and fixed. Become. Therefore, the front panel 15 made of the resin sheet is also directly bonded to the foamed heat insulating material 22, and its shape is in a fixed state.

In the first embodiment described above, the front surface 15A may have a gentle curved surface or may be bent to have a curved surface shape from the front surface 15A to both side surfaces 15B so as to enhance the design.

Next, a second embodiment of the freezer compartment door will be described based on FIGS. 6 and 7. First, for example, a resin sheet made of a curable resin (a thermosetting resin, a light curable resin, a water curable resin, or the like) is cut into an appropriate size, and in order to use this for the front panel 35, Punching to a specified size. The resin sheet having a predetermined size as described above is formed into an appropriate shape for use as the front panel 35 by an appropriate method or means. That is, the upper side of the rectangular flat plate is recessed so as to draw a gentle curve so that the central portion of the upper side becomes the lowest when viewed from the front, and is formed as shown in FIG.

Reference numeral 36 denotes a frame body that supports an outer end portion of the front panel 35, and the front panel 35 is attached to the peripheral edges of the left and right and lower front surfaces by adhesively fixing the front panel 35 with an adhesive or a double-sided adhesive tape. The surface 36A is formed. Further, a concave portion is formed on the upper surface of the frame body 36 so as to form a space S for holding the freezing compartment door 11 forward.

The recessed portion is a front rising piece 36B that is recessed in a gentle curve so that the upper end thereof becomes lower toward the center when viewed from the front, and a horizontal surface extending rearward from the lowermost portion of the front rising piece 36B. 36C, a rear rising piece 36D that rises upward from the rear end of the horizontal surface 36C, and a horizontal surface 36E that horizontally extends from the rear end of the rear rising piece 36D.

The frame 36 includes a reinforcing surface portion 36H having an opening 36K. The frame 36 has a shape in which the left and right openings 36K are separated by vertical bars, and is a simple rectangular frame (that is, a shape in which the left and right openings are connected without the vertical bars. ), the overall strength of the frame body 36 is increased so that the frame body 36 does not easily twist.

The cushioning material 36M having a shape that fits into the continuous rectangular frame 36 (two frames in FIG. 6) comes into contact with the heat insulating foam material (urethane heat insulating material) 44 of the front panel 35. Adhered to at least part of the surface. The cushioning material 36M is a material that has the effect of changing the volume of the foam heat insulating material 44 itself under the influence of a temperature change from the outside of the freezer compartment door 11. For example, when the volume of the foamed heat insulating material 44 expands due to the temperature rise of the foamed heat insulating material 44, the buffer material 36M absorbs the expanded volume in response to the expansion. The thickness of 36M is reduced. By adopting such a configuration, even if the pressure from the inside of the freezer compartment door 11 increases outward due to the expansion of the foamed heat insulating material 44, the cushioning material 36M absorbs the expansion, and therefore the front panel 35. The outer shape of the entire freezer compartment door 11 can be maintained without being deformed so as to bulge.

The cushioning material 36M has a predetermined thickness in order to absorb the expansion of the foamed heat insulating material 44. The thickness may depend on the degree of expansion and contraction of the foamed heat insulating material 44 in the assumed usage situation/storage environment, the size of the entire cushioning material 36M used inside the freezer door 11, and the like.

The foamed heat insulating material 44 contracts when the temperature of the foamed heat insulating material 44 itself decreases. That is, when the foam insulating material 44 is stored or used in an environment where the temperature is lower than the stage (manufacturing stage) of filling the freezer door 11 with the foam insulating material 44, the cushioning material 36M is filled to such an extent that it slightly shrinks. You may. As a result, it is possible to prevent the front panel 35 from being shrunk and deformed by the pressure due to the shrinkage of the foamed heat insulating material 44.

The material of the cushioning material 36M may be a material having a structure like a filter, a so-called sealing material or the like, or may be composed of a single layer or a multi-layered structure of fibrous sheets. -Based material, foam material with closed cell structure such as polyethylene (foam material), foam material with open cell structure such as urethane foam (foam material), and one of these materials Alternatively, a plurality of layers may be used to form a laminated structure.

The shock absorber 36M is attached to the front panel 35 in this embodiment. As another example, in addition to the front panel 35, the cushioning material 36M may be attached to the frame body 36, the rear panel 40, or the like. Further, as yet another example, the cushioning material 36M may be attached to the inside of the freezer door 11 where the strength is relatively weak. As a result, the cushioning material 36M also has the effect of reinforcing the strength of the freezer compartment door 11, which facilitates the handling of the refrigerator during manufacture or use.

In addition, in the present embodiment, it has been described that the thickness of the cushioning material 36M changes in accordance with the volume change of the foamed heat insulating agent 44. As an alternative example, if the resin sheet has a thickness of 0.1 mm or more, the same action as that of the cushioning material 36M described above is achieved.

Further, a restricting piece 37 is attached to the frame body 36 so as to be lowered from the outer end portion toward the left and right central positions. The regulation piece 37 is fixed to the upper portion of the front rising piece 36B of the frame body 36, and regulates the upper position of the front panel 35 when the front panel 35 is fixed to the mounting surface 36A, as described above. To do. The restricting piece 37, the front rising piece 36B, the horizontal surface 36C, and the rear rising piece 36D form a handle.

A locking member 38 is attached to the frame body 36. The locking member 38 is formed in a rectangular frame shape having an L-shaped vertical cross section, and has a lower surface of the horizontal surface 36E of the frame body 36, both side surfaces 36F of the frame body 36, and a lower surface 36G of the front panel 35. It is fixed to the rear end. Note that the restriction piece 37 and the locking member 38 may be formed integrally with the frame body 36 from the beginning.

A flange 40A is formed at a peripheral end portion of the rear panel 40, and the flange 40A abuts and is fixed from the back to the locking member 38 fixed to the frame body 36. The rear panel 40 is made of a synthetic resin material, has a front surface to which a reinforcing member 39 is attached, a rear surface to which a storage container (not shown) or the like is attached, and a peripheral edge portion which is provided with a sealing magnet 42. 41 is attached.

As described above, the recessed portion (groove) 40B for mounting the gasket 41 with the magnet 42 is continuously formed on the peripheral portion of the back panel 40. The magnet 42 closes the front opening of the freezer-refrigerator body 1 when it is attracted to the front end of the steel box of the refrigerator-freezer body 1.

Then, the regulation piece 37 is fixed to the upper part of the front rising piece 36B of the frame body 36, and the lower surface of the horizontal surface 36E of the frame body 36, both side surfaces 36F of the frame body 36, and the lower surface 36G of the front panel 35. With the locking member 38 fixed to the rear end, the front panel 35 is adhesively fixed to the mounting surface 36A of the frame 36 with an adhesive or a double-sided adhesive tape. Further, the flange 40A of the back panel 40, on which the gasket 40 with the magnet 42 is mounted, is brought into contact with and fixed to the locking member 38, and the front panel 35, the frame body 36, and the back panel 40 are attached to each other. Integrate.

Then, after being integrated in this manner, a stock solution of a foaming resin, for example, is injected into the space defined by the front panel 35, the frame body 36 and the back panel 40 by an in-situ foaming method. It foams and the foam insulation 44 is formed.

Attachment and fixing of each member when forming the foamed heat insulating material 44 is performed by fitting each part, fitting each part, or adhering with an adhesive or a double-sided adhesive tape. Moreover, when the undiluted solution of the foamable resin is injected, the entire outer shape of the freezer compartment door 11 in which the above-mentioned members are attached and fixed is pressed and fixed by the foaming jig for receiving the foaming pressure. Then, the foamed heat insulating material 44 is formed by foaming and hardening the liquid. The foamed heat insulating material 44 thus formed firmly and integrally fixes the front panel 35, the frame body 36 and the rear panel 40 (see FIGS. 7 and 8A). The front panel 35 made of the resin sheet is fixed in shape by the foamed heat insulating material 44 via the cushioning material 36M or the like.

8B is a more detailed illustration of the alternative embodiment of FIG. 8A as a partially enlarged view of FIG. 8A.

One surface of the cushioning material 36M is bonded to the front panel 35 with an adhesive 36P. Further, the anchor material 36N may be adhered to the surface of the cushioning material 36M on the opposite side to the adhesive surface with an adhesive 36Q or the like. The anchor material 36N is a further cushioning material (second cushioning material) that assists the cushioning material 36M. The anchor material 36N prevents the foam insulation material 44 and the cushioning material 36M from directly contacting with each other, thereby preventing the foam insulation material 44 from penetrating into the cushioning material 36M. As the material of the anchor material 36N, any material that does not allow the foamed heat insulating material 44 to penetrate into the anchor material 36N may be used, and for example, paper such as cardboard may be used. When using corrugated cardboard, only the flute portion (corrugated portion that is the core of the corrugated board) may be used. It may be a resin film such as a biaxially stretched polyethylene terephthalate resin film.

Then, on the back surface of the rear panel 20, 40 of the freezer compartment door 11 manufactured as described above, it moves back and forth along a storage container (not shown) and a rail formed on the inner surface of the refrigerator-freezer body 1. A mechanism or the like that enables it is attached.

As the first embodiment of the freezer compartment door 11 described above, the door caps 16 and 17 as frames are attached to the upper and lower portions of the front panel 15 to support the front panel 15, and As the second embodiment of the freezer compartment door 11, the outer peripheral end of the front panel 35 is supported by the single frame 36, but the frame is attached to the left and right parts of the front panel 15, respectively. You may make it support, and you may make it attach and support four frame bodies, respectively, up and down, right and left. Also, two sides of the front panel may be supported by two frame bodies respectively, or one frame body of three sides of the front panel 11, 35 may support the remaining one side by another frame body. You can

In this case, the handle is provided on the upper part of the frame body of the freezer compartment door 11 in the first and second embodiments of the freezer compartment door 11 described above, but a lower part is provided according to the structure of the frame body. Alternatively, it may be provided in either of the left and right parts.

In the first and second embodiments of the freezer compartment door 11 described above, the thickness of the resin sheet used for the front panels 15 and 35 is the strength required for a door body used in a refrigerator. In addition, in order to maintain rigidity, the thickness is 0.1 mm or more. If it is less than 0.1 mm, it becomes difficult to maintain the required strength and rigidity. When an amorphous or low crystalline polyester resin sheet is used, considering the viewpoint of manufacturing the freezer door 11, etc., it is preferably 0.5 mm or more, more preferably 0.8 mm or more, and further preferably 1. It is 2 mm or more. On the other hand, if it is too thick, the workability will be reduced. Therefore, the thickness is 10 mm or less, preferably 7 mm or less, and more preferably 5 mm or less.

In addition, the resin sheet used for the front panels 15 and 35 retains strength and rigidity required for a door body used in a refrigerator, and therefore, its tensile elastic modulus is a tensile elastic modulus of a general polypropylene (700). ˜1400 MPa). Further, in the case of a hard resin sheet (polyester resin sheet, acrylic resin sheet, aromatic polycarbonate resin sheet, etc.) that can ensure transparency, its tensile elastic modulus is preferably 1500 MPa or more, It is preferably 1800 MPa or more. In this case, the upper limit of the tensile elastic modulus is not particularly limited, but since it is a resin sheet, it is at most 10,000 MPa or less in the range that is normally available.

The tensile elastic modulus of the resin sheet of the present embodiment was measured in accordance with JIS K 7113:1995 under the conditions of a No. 1 test piece and a pulling speed of 50 mm/min.
As the resin sheet, various resin sheets can be used. For example, polyester resins such as aromatic polyesters and aliphatic polyesters; acrylic resins; polycarbonate resins; polyolefin resins such as polyethylene, polypropylene and polymethylpentene; cellophane, triacetyl cellulose, diacetyl cellulose, acetyl cellulose butyrate, etc. Cellulose resin: polystyrene, acrylonitrile/butadiene/styrene copolymer resin (ABS resin), styrene/ethylene/butadiene/styrene copolymer, styrene/ethylene/butadiene/styrene copolymer, or other styrene resin; polyvinyl chloride -Based resin; polyvinylidene chloride-based resin; fluorine-containing resin such as polyvinylidene fluoride; polyvinyl alcohol, ethylene vinyl alcohol, polyether ether ketone, nylon, polyamide, polyimide, polyurethane, polyetherimide, polysulfone, polyether A resin sheet such as a sulfone can be used. These sheets include non-stretched sheets, uniaxially stretched sheets, and biaxially stretched sheets. In addition, a multilayer laminated sheet in which two or more layers of one or more of these are laminated is included.

The resin sheet used for the front panels 15 and 35 preferably includes a surface protective layer (A2) and a transparent resin sheet layer (A1) from the front side of the freezer compartment door 11 of the refrigerator. It is a laminated body including in order. The laminate will be described below.

(A1) Transparent resin sheet layer;
The transparent resin sheet layer (A1) is preferably a resin sheet layer having a layer thickness of 0.2 mm or more and a haze value of 10% or less. By using such a transparent resin sheet layer (A1), it is possible to give the freezing compartment door 11 of the refrigerator a design with a sense of depth similar to glass.

The layer thickness of the transparent resin sheet layer (A1) is more preferably 0.5 mm or more, still more preferably 1 mm or more. The layer thickness is preferably as thick as possible from the viewpoint of designability. The upper limit of the layer thickness is defined by the total thickness of the front panel 15.

The haze value is preferably 6% or less, more preferably 4% or less, and most preferably 2% or less. The lower limit of the haze value depends on the design to be applied to the freezer compartment door, but it is usually preferable that the haze value gives a clear and transparent feeling, and the smaller the lower limit, the better. In the present embodiment, the haze value was measured using a turbidimeter “NDH2000” (trade name) manufactured by Nippon Denshoku Industries Co., Ltd. according to JIS K 7136:2000.

The transparent resin sheet used as the transparent resin sheet layer (A1) is preferably not limited except that the layer thickness is 0.2 mm or more and the haze value is 10% or less, and any transparent A resin sheet can be used.

For example, polyester resins such as aromatic polyesters and aliphatic polyesters; acrylic resins; polycarbonate resins; polyolefin resins such as polyethylene, polypropylene and polymethylpentene; cellophane, triacetyl cellulose, diacetyl cellulose, acetyl cellulose butyrate, etc. Cellulose resin: polystyrene, acrylonitrile/butadiene/styrene copolymer resin (ABS resin), styrene/ethylene/butadiene/styrene copolymer, styrene/ethylene/butadiene/styrene copolymer, or other styrene resin; polyvinyl chloride -Based resins; polyvinylidene chloride-based resins; fluorine-containing resins such as polyvinylidene fluoride; polyvinyl alcohol, ethylene vinyl alcohol, polyether ether ketone, nylon, polyamide, polyimide, polyurethane, polyether imide, polysulfone, polyether A transparent resin sheet such as a sulfone can be used. These sheets include non-stretched sheets, uniaxially stretched sheets, and biaxially stretched sheets. It also includes a laminated sheet in which two or more layers of one or more of these are laminated.

And as a preferable transparent resin sheet used as the transparent resin sheet layer (A1), a transparent polyester resin sheet (a1-1), a transparent acrylic resin sheet (a2-1), a transparent aromatic polycarbonate resin sheet (a3). -1) can be mentioned, and a laminated sheet obtained by laminating two or more layers of one or more of these can be used. These sheets include non-stretched sheets, uniaxially stretched sheets, and biaxially stretched sheets.

Preferred examples of the laminated sheet used as the transparent resin sheet layer (A1) include a laminated sheet of a high hardness acrylic resin sheet and a flexible acrylic resin sheet, an acrylic resin sheet and an aromatic polycarbonate resin sheet. The laminated sheet of can be mentioned. A laminated sheet of resin sheets of exactly the same type is also an example of a preferable laminated sheet from the viewpoint of manufacturability. For example, a resin sheet in which two or more biaxially stretched polyethylene terephthalate resin films are laminated can be used.

When the transparent resin sheet is an amorphous or low crystalline polyester type, an aromatic polycarbonate type, or an acrylic type, vacuum molding is not required. On the other hand, polypropylene is highly crystalline (especially, large spherulites grow in thick sheets), so it is better to use amorphous or low crystalline polyesters, aromatic polycarbonates, and acrylics. However, it is excellent in terms of transparency and gloss. Further, for the transparent resin sheet, the use of an amorphous or low-crystalline polyester type or an aromatic polycarbonate type is superior to the use of an acrylic type in terms of resistance to moist heat and whitening.

The method for obtaining the laminated sheet is not limited, and the laminated sheet can be obtained by any method. For example, a method of obtaining each resin sheet by an arbitrary method and then dry laminating or heat laminating, melting each constituent material by an extruder, and obtaining by T-die coextrusion by a feed block method or a multi-manifold method, etc. Examples include a method and an extrusion laminating method in which at least one resin sheet is obtained by an arbitrary method and then another resin sheet is melt-extruded on the sheet.

In addition, a printed layer (A5) may be provided between the layers of the laminated sheet to enhance the design feeling. The print layer (A5) is preferably provided partially or using transparent ink so as not to impair the feeling of depth.

(A2) surface protective layer;
It is preferable to provide a surface protective layer (A2) on the surface of the transparent resin sheet layer (A1) that is the surface side of the freezer compartment door 11, directly or through a transparent anchor coat. By providing this surface protective layer (A2), it is possible to improve the external damage resistance and the solvent resistance.

The surface protective layer (A2) may be, for example, a hard coat. The paint used for forming the hard coat preferably has high transparency and high gloss from the viewpoint of designability. Examples of such a hard coat-forming coating material include an active energy ray-curable resin composition.

The active energy ray-curable resin composition is capable of polymerizing and curing with active energy rays such as ultraviolet rays and electron beams to form a hard coat. Examples thereof include a composition containing a compound having two or more isocyanate groups (-N=C=O) and/or a photopolymerization initiator.

Examples of the active energy ray-curable resin include polyurethane (meth)acrylate, polyester (meth)acrylate, polyacryl (meth)acrylate, epoxy (meth)acrylate, polyalkylene glycol poly(meth)acrylate, and polyether. (Meth)acryloyl group-containing prepolymer or oligomer such as (meth)acrylate; methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate , Lauryl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, phenyl (meth)acrylate, phenyl cellosolve (meth)acrylate, 2-methoxyethyl ( (Meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, 2-acryloyloxyethyl hydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, and trimethylsiloxyethyl methacrylate. (Meth)acryloyl group-containing monofunctional reactive monomer; monofunctional reactive monomers such as N-vinylpyrrolidone and styrene; diethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di( (Meth)acrylate, polyethylene glycol di(meth)acrylate, 2,2'-bis(4-(meth)acryloyloxypolyethyleneoxyphenyl)propane, and 2,2'-bis(4-(meth)acryloyloxypolypropyleneoxy (Meth)acryloyl group-containing bifunctional reactive monomer such as phenyl)propane; (meth)acryloyl group-containing trifunctional reactive monomer such as trimethylolpropane tri(meth)acrylate and trimethylolethanetri(meth)acrylate; pentaerythritol One or more selected from a (meth)acryloyl group-containing tetrafunctional reactive monomer such as tetra(meth)acrylate; and a (meth)acryloyl group-containing hexafunctional reactive monomer such as dipentaerythritol hexaacrylate, or Examples of the resin include one or more of the above as constituent monomers. As the active energy ray curable resin, one kind or a mixture of two or more kinds thereof can be used.

In addition, in this specification, (meth)acrylate means an acrylate or a methacrylate.

Examples of the compound having two or more isocyanate groups in one molecule include methylenebis-4-cyclohexyl isocyanate; trimethylolpropane adduct of tolylene diisocyanate, trimethylolpropane adduct of hexamethylene diisocyanate, trimethylolpropane of isophorone diisocyanate. Polyisocyanates such as adducts, isocyanurates of tolylene diisocyanate, isocyanurates of hexamethylene diisocyanate, isocyanurates of isophorone diisocyanate, biuret of hexamethylene diisocyanate; and urethane crosslinking of block isocyanates of the polyisocyanates Agents can be given. These may be used alone or in combination of two or more. In addition, at the time of crosslinking, a catalyst such as dibutyltin dilaurate or dibutyltin diethylhexoate may be added if necessary.

Examples of the photopolymerization initiator include benzophenone, methyl-o-benzoylbenzoate, 4-methylbenzophenone, 4,4′-bis(diethylamino)benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4 -Benzoyl-4'-methyldiphenyl sulfide, benzophenone-based compounds such as 3,3',4,4'-tetra(tert-butylperoxycarbonyl)benzophenone and 2,4,6-trimethylbenzophenone; benzoin, benzoin methyl ether , Benzoin ethyl ether, benzoin isopropyl ether, benzyl methyl ketal, and other benzoin compounds; acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenyl ketone, and other acetophenone compounds; methylanthraquinone, 2-ethylanthraquinone Anthraquinone compounds such as 2-amylanthraquinone; thioxanthone compounds such as thioxanthone, 2,4-diethylthioxanthone and 2,4-diisopropylthioxanthone; alkylphenone compounds such as acetophenone dimethyl ketal; triazine compounds; biimidazole compounds; Examples thereof include an acylphosphine oxide compound; a titanocene compound; an oxime ester compound; an oxime phenylacetic acid ester compound; a hydroxyketone compound; and an aminobenzoate compound. These may be used alone or in combination of two or more.

Further, the active energy ray-curable resin composition, if necessary, an antistatic agent, a surfactant, a leveling agent, a thixotropy imparting agent, an antifouling agent, a printability improving agent, an antioxidant, a weather resistance stable. One or two or more kinds of additives such as an agent, a light resistance stabilizer, an ultraviolet absorber, a heat stabilizer, a colorant and a filler may be contained.

Among the optional components used as necessary in the active energy ray-curable resin composition, fine particles having a particle diameter of 1 nm to 300 nm can be mentioned as a preferable example. By using the fine particles in an amount of 1 to 300 parts by mass, preferably 20 to 100 parts by mass, based on 100 parts by mass of the active energy ray-curable resin component, the hardness of the hard coat can be increased and the scratch resistance can be improved.

As the fine particles, both inorganic fine particles and organic fine particles can be used. Examples of the inorganic fine particles include silica (silicon dioxide); fine particles of metal oxides such as aluminum oxide, zirconia, titania, zinc oxide, germanium oxide, indium oxide, tin oxide, indium tin oxide, antimony oxide, and cerium oxide; Examples thereof include metal fluoride fine particles such as magnesium fluoride and sodium fluoride; metal fine particles; metal sulfide fine particles; metal nitride fine particles. Examples of the organic fine particles include resin beads such as a styrene resin, an acrylic resin, a polycarbonate resin, an ethylene resin, and a cured resin of an amino compound and formaldehyde. These can be used alone or in combination of two or more.

Further, for the purpose of enhancing the dispersibility of the fine particles in the coating material and the hardness of the obtained hard coat, the surface of the fine particles is a silane coupling agent such as vinylsilane or aminosilane; a titanate coupling agent; aluminum. Nate-based coupling agents; organic compounds having a reactive functional group such as an ethylenically unsaturated bond group such as (meth)acryloyl group, vinyl group, allyl group or epoxy group; surface treatment agent such as fatty acid or fatty acid metal salt You may use what was processed by.

Among these, fine particles of silica and aluminum oxide are preferable, and fine particles of silica are more preferable, in order to obtain a hard coat having higher hardness. Examples of commercially available silica fine particles include Snowtex (trade name) manufactured by Nissan Chemical Industry Co., Ltd. and Quartlon (trade name) manufactured by Fuso Chemical Industry Co., Ltd.

The average particle size of the fine particles is usually 300 nm or less in order to maintain the transparency of the hard coat and to reliably obtain the effect of improving the hardness of the hard coat. It is preferably 200 nm or less, and more preferably 120 nm or less. On the other hand, there is no particular lower limit on the particle size, but normally available particles are at most about 1 nm even if they are fine.

In the present specification, the average particle size of the fine particles is from the smaller one in the particle size distribution curve measured using a laser diffraction/scattering particle size analyzer “MT3200II” (trade name) manufactured by Nikkiso Co., Ltd. Is a particle size at which the cumulative value of 50% by mass is obtained.

In addition, the active energy ray-curable resin composition may contain a solvent, if necessary, in order to dilute it to a concentration that facilitates coating. The solvent is not particularly limited as long as it does not react with the components of the curable resin composition and other optional components or catalyze (promote) self-reaction (including deterioration reaction) of these components. Examples thereof include 1-methoxy-2-propanol, ethyl acetate, n-butyl acetate, toluene, methyl ethyl ketone, methyl isobutyl ketone, diacetone alcohol, and acetone.

The active energy ray curable resin composition is obtained by mixing and stirring these components.

The method for applying the paint is not particularly limited, and a known web application method can be used. Specifically, methods such as roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating and die coating can be mentioned.

The thickness of the hard coat is not particularly limited, but it is preferably 0.5 μm or more from the viewpoint of surely obtaining the effect of improving external damage resistance and solvent resistance. On the other hand, there is no particular upper limit on the thickness of the hard coat. However, since an unnecessarily thick hard coat only causes a cost increase, the thickness is at most 50 μm.

The anchor coating agent used for the transparent anchor coating is not limited except that it is transparent, and for example, known materials such as polyester, acrylic, polyurethane, acrylic urethane, polyester urethane and the like can be used.

The method of applying the anchor coating agent is not particularly limited, and a known web coating method can be used. Specifically, methods such as roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, and die coating can be mentioned.

The thickness of the transparent anchor coat is usually about 0.1 to 5 μm, preferably 0.5 to 2 μm.

In addition, as the surface protective layer (A2), for example, a film of a resin such as a vinylidene fluoride resin film or a biaxially stretched polyethylene terephthalate film having excellent external damage resistance and solvent resistance may be laminated.

The vinylidene fluoride resin film can be obtained by forming a vinylidene fluoride resin film by an arbitrary method. Examples of the vinylidene fluoride-based resin include vinylidene fluoride homopolymers and copolymers containing vinylidene fluoride as a constituent unit in an amount of 70 mol% or more, and one or more of these may be used. Mixtures can be used. Examples of the monomer copolymerized with vinylidene fluoride include tetrafluoroethylene, hexafluoropropylene, trifluoroethylene, trifluorochloroethylene, vinyl fluoride, and the like. One of these or Two or more kinds can be used. Further, within the range not deviating from the object of the present invention, the vinylidene fluoride resin includes a lubricant, an antioxidant, a weather resistance stabilizer, a heat stabilizer, a release agent, an antistatic agent, a surfactant, a nucleating agent, It may include coloring materials, plasticizers and the like.

The melting point of these vinylidene fluoride resins is usually in the range of 145 to 180°C, but from the viewpoint of workability, it is preferable to use one having a temperature of 150 to 170°C.

In this specification, a Diamond DSC type differential scanning calorimeter manufactured by Perkin Elmer Japan Co., Ltd. is used, the sample is held at 230° C. for 5 minutes, and then cooled to −50° C. at a temperature lowering rate of 10° C./min. The peak top on the highest temperature side in the melting curve obtained by performing DSC measurement with a temperature program of holding at 50° C. for 5 minutes and then heating to 230° C. at a temperature rising rate of 10° C./minute was defined as the melting point. ..

The method for laminating the transparent resin sheet layer (A1) and the vinylidene fluoride resin film is not limited and may be laminated by any method. For example, a method of obtaining a transparent resin sheet layer (A1) and a vinylidene fluoride resin film by an arbitrary method and then dry laminating or heat laminating, melting each constituent material with an extruder, and feeding block method or A method of obtaining by T-die coextrusion by a multi-manifold method, an extrusion laminating method in which one of the transparent resin sheet layer (A1) and the vinylidene fluoride resin film is obtained by an arbitrary method, and then the other is melt-extruded. And so on.

The above-mentioned biaxially stretched polyethylene terephthalate film is widely commercially available, and any one can be used.

The method for laminating the above-mentioned transparent resin sheet layer (A1) and the biaxially stretched polyethylene terephthalate film is not limited and can be laminated by any method. For example, the transparent resin sheet layer (A1) and the biaxially stretched polyethylene terephthalate film are each obtained by an arbitrary method, and then dry laminated, or the transparent resin sheet layer (A1) is melt extruded on the biaxially stretched polyethylene terephthalate film. Extrusion laminating method and the like can be mentioned.

(A3) Colored resin sheet layer;
The surface of the transparent resin sheet layer (A1) on which the foamed heat insulating materials 22 and 44 are formed is directly or via an anchor coat, or via an adhesive, or via an anchor coat and an adhesive. Further, a colored resin sheet layer (A3) may be further provided.

By providing the colored resin sheet layer (A3), the foamed heat insulating materials 22 and 44 are surely concealed, and the color of the colored resin sheet layer (A3) can be seen from the back of the transparent resin sheet layer (A1). As a result, a feeling of depth can be increased.

The colored resin sheet used as the colored resin sheet layer (A3) is not limited, and any colored resin sheet can be used. For example, polyester resins such as aromatic polyesters and aliphatic polyesters; acrylic resins; polycarbonate resins; polyolefin resins such as polyethylene, polypropylene and polymethylpentene; cellophane, triacetyl cellulose, diacetyl cellulose, acetyl cellulose butyrate, etc. Cellulose resin: polystyrene, acrylonitrile/butadiene/styrene copolymer resin (ABS resin), styrene/ethylene/butadiene/styrene copolymer, styrene/ethylene/butadiene/styrene copolymer, or other styrene resin; polyvinyl chloride -Based resin; polyvinylidene chloride-based resin; fluorine-containing resin such as polyvinylidene fluoride; polyvinyl alcohol, ethylene vinyl alcohol, polyether ether ketone, nylon, polyamide, polyimide, polyurethane, polyetherimide, polysulfone, polyether Colored resin sheets such as sulfone can be used. These sheets include non-stretched sheets, uniaxially stretched sheets, and biaxially stretched sheets. In addition, a laminated sheet in which two or more layers of one or more of these are laminated is included.

(A4) printing layer;
A printing layer (A4) may be further provided on the surface of the transparent resin sheet layer (A1) on the side where the foamed heat insulating materials 22 and 44 are formed, either directly or via an anchor coat. In this case, the colored resin sheet layer (A3) may be further provided on the printed layer (A4). The printed layer (A4) may be provided on the surface of the colored resin sheet layer (A3) on the transparent resin sheet layer (A1) side.

The above-mentioned printing layers (A4) and (A5) impart design characteristics to the freezer compartment door 11, and are formed by printing an arbitrary pattern using an arbitrary ink and an arbitrary printing machine. It Printing may be performed on either the transparent resin sheet layer (A1) or the colored resin sheet (A3). Examples of the pattern include a wood pattern, a stone pattern simulating the surface of rock such as marble, a fabric pattern simulating a textured or cloth-like pattern, a tile pasting pattern, a brickwork pattern, a parquet pattern, and patchwork. it can. As the printing ink, a mixture of a binder, a pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent and the like can be used. Examples of the binder include polyurethane resins, vinyl chloride/vinyl acetate copolymer resins, vinyl chloride/vinyl acetate/acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, polyester resins, polyamides. A resin such as a resin, a butyral resin, a polystyrene resin, a nitrocellulose resin, a cellulose acetate resin, or a resin composition thereof can be used.

As described above, the resin sheet forming the front panel 15 is preferably selected from the polyester resin sheet (a1), the acrylic resin sheet (a2), and the aromatic polycarbonate resin sheet (a3). Contains at least one. The polyester resin sheet (a1) is more preferably an amorphous or low crystalline aromatic polyester resin sheet (a11).

The front panel 15 is more preferably a laminated body including the surface protective layer (A2) and the transparent resin sheet layer (A1) in this order from the front surface side of the freezer compartment door 11 of the refrigerator. is there. The transparent resin sheet layer (A1) is selected from the transparent polyester resin sheet (a1-1), the transparent acrylic resin sheet (a2-1), and the transparent aromatic polycarbonate resin sheet (a3-1). At least one Here, the transparent polyester resin sheet (a1-1) is more preferably a transparent amorphous or low crystalline aromatic polyester resin sheet (a1-2).

(A1) Polyester resin sheet;
The polyester resin sheet (a1) is a sheet mainly made of a resin or a resin composition containing (90% by mass or more) any polyester resin, and includes a non-stretched sheet, a uniaxially stretched sheet, and a biaxially stretched sheet.

The transparent polyester resin sheet (a1-1) is the polyester resin sheet (a1) and has a haze value of 10% or less, preferably 6% or less, more preferably 4% or less, and most preferably 2%. The following sheets.

(A11) Amorphous or low crystalline aromatic polyester resin sheet;
The amorphous or low crystalline aromatic polyester-based resin sheet (a11) is a sheet made of a resin or a resin composition containing mainly (90% by mass or more) an amorphous or low crystalline aromatic polyester-based resin. ..

The transparent amorphous or low crystalline aromatic polyester-based resin sheet (a1-2) is the amorphous or low crystalline aromatic polyester-based resin sheet (a11), and has a haze value of 10% or less, The sheet is preferably 6% or less, more preferably 4% or less, and most preferably 2% or less.

Examples of the amorphous or low crystalline aromatic polyester resins include aromatic polyvalent carboxylic acid components such as terephthalic acid, isophthalic acid, orthophthalic acid and naphthalenedicarboxylic acid, and ethylene glycol, diethylene glycol, neopentyl glycol, 1 ,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, 1 , A polyester copolymer with a polyhydric alcohol component such as 4-cyclohexanedimethanol,
More specifically, the total amount of the monomers is 100 mol %,
Glycol-modified polyethylene terephthalate (PETG) containing 45 to 50 mol% terephthalic acid, 30 to 40 mol% ethylene glycol, and 10 to 20 mol% 1,4-cyclohexanedimethanol;
Glycol-modified polycyclohexylene dimethylene terephthalate (PCTG) containing 45-50 mol% terephthalic acid, 16-21 mol% ethylene glycol and 29-34 mol% 1,4-cyclohexanedimethanol.
Acid-modified polycyclohexylene dimethylene terephthalate (PCTA) containing 25-49.5 mol% terephthalic acid, 0.5-25 mol% isophthalic acid and 45-50 mol% 1,4-cyclohexanedimethanol;
Acid modification and glycol containing 30-45 mol% terephthalic acid, 5-20 mol% isophthalic acid and 35-48 mol% ethylene glycol, 2-15 mol% neopentyl glycol, less than 1 mol% diethylene glycol, less than 1 mol% bisphenol A. Modified polyethylene terephthalate;
And the like, or a mixture of two or more of them.

In this specification, a Diamond DSC type differential scanning calorimeter manufactured by Perkin Elmer Japan Co., Ltd. is used, the sample is held at 320° C. for 5 minutes, and then cooled to −50° C. at a temperature lowering rate of 20° C./min. After holding at 50° C. for 5 minutes, DSC measurement is performed with a temperature program of heating to 320° C. at a heating rate of 20° C./min. Polyester having a property of more than 10 J/g and 60 J/g or less was defined as low crystallinity.

The amorphous or low crystalline aromatic polyester resin may contain other components, if necessary. The optional components that may be contained are thermoplastic resins other than amorphous or low crystalline aromatic polyester resins; pigments, inorganic fillers, organic fillers, resin fillers; lubricants, antioxidants, weather resistance stabilizers, heat stabilizers. , Release agents, antistatic agents, and additives such as surfactants; and the like. The blending amount of these optional components is usually about 0.1 to 10 parts by mass, when 100 parts by mass of the amorphous or low crystalline aromatic polyester resin is used.

As a preferable optional component, core shell rubber can be cited, and by using this, impact resistance can be improved. Examples of the core-shell rubber include methacrylic acid ester/styrene/butadiene rubber graft copolymer, acrylonitrile/styrene/butadiene rubber graft copolymer, acrylonitrile/styrene/ethylene/propylene rubber graft copolymer, acrylonitrile/styrene/acrylic acid. One or a mixture of two or more core shell rubbers such as ester graft copolymer, methacrylic acid ester/acrylic acid ester rubber graft copolymer, and methacrylic acid ester/acrylonitrile/acrylic acid ester rubber graft copolymer. You can

The amount of the above-mentioned core-shell rubber is preferably 0.5 parts by mass or more in order to improve impact resistance when the amorphous or low crystalline aromatic polyester resin is 100 parts by mass, and the transparency is In order to maintain the content of the compound, it is preferably 5 parts by mass or less, more preferably 3 parts by mass or less.

(A2) Acrylic resin sheet;
The acrylic resin sheet (a2) is a sheet mainly made of acrylic resin (50% by mass or more) or a resin composition. The transparent acrylic resin sheet (a2-1) is the acrylic resin sheet (a2) and has a haze value of 10% or less, preferably 6% or less, more preferably 4% or less, and most preferably 2%. The following sheets.

Examples of the acrylic resin include methyl poly(meth)acrylate, ethyl poly(meth)acrylate, propyl poly(meth)acrylate, butyl poly(meth)acrylate, and methyl(meth)acrylate. ) A butyl acrylate copolymer, a (meth)acrylic acid ester (co)polymer such as an ethyl (meth)acrylate/butyl (meth)acrylate copolymer; an ethylene/(meth)acrylic acid methyl copolymer, A copolymer containing (meth)acrylic acid ester such as styrene/methyl (meth)acrylate copolymer; and a mixture of one or more acrylic resins (acry), and a methacrylic acid ester/styrene/ Butadiene rubber graft copolymer, acrylonitrile/styrene/butadiene rubber graft copolymer, acrylonitrile/styrene/ethylene/propylene rubber graft copolymer, acrylonitrile/styrene/acrylic acid ester graft copolymer, methacrylic acid ester/acrylic acid ester Examples thereof include a resin composition containing one or a mixture of two or more core-shell rubbers such as a rubber graft copolymer and a methacrylic acid ester/acrylonitrile/acrylic acid ester rubber graft copolymer.

In addition, (meth)acryl means acryl or methacryl. Further, the (co)polymer means a polymer or a copolymer.

As for the compounding ratio of the acrylic resin (acry) and the core-shell rubber (core), when the total of the two is 100 parts by mass, preferably 50 to 85 parts by mass of the acrylic resin (acry), the core-shell rubber (Core) is 50 to 15 parts by mass, more preferably 60 to 75 parts by mass of the acrylic resin (acry) and 40 to 25 parts by mass of the core-shell rubber (core).

Further, as the optional components that may be contained in the acrylic resin composition, thermoplastic resins other than acrylic resins and core-shell rubbers; pigments, inorganic fillers, organic fillers, resin fillers; lubricants, antioxidants, weather resistance stabilizers, Examples thereof include heat stabilizers, release agents, antistatic agents, nucleating agents, and additives such as surfactants. The blending amount of these optional components is usually about 0.1 to 10 parts by mass, when the total amount of the acrylic resin (acry) and the core shell rubber (core) is 100 parts by mass.

(A3) Aromatic polycarbonate resin sheet;
The aromatic polycarbonate-based resin sheet (a3) is a sheet made of a resin or a resin composition containing mainly (50% by mass or more) an aromatic polycarbonate-based resin. The transparent aromatic polycarbonate resin sheet (a3-1) is the aromatic polycarbonate resin sheet (a3), and has a haze value of 10% or less, preferably 6% or less, more preferably 4% or less, The sheet is preferably 2% or less.

Examples of the aromatic polycarbonate resin composition include a polymer obtained by an interfacial polymerization method of an aromatic dihydroxy compound such as bisphenol A and phosgene; an aromatic dihydroxy compound such as bisphenol A and a carbonic acid diester such as diphenyl carbonate. A polymer obtained by the transesterification reaction of 1; or a mixture of two or more aromatic polycarbonate resins (pc), a methacrylic acid ester/styrene/butadiene rubber graft copolymer, acrylonitrile/styrene/butadiene rubber Graft copolymer, acrylonitrile/styrene/ethylene/propylene rubber graft copolymer, acrylonitrile/styrene/acrylic acid ester graft copolymer, methacrylic acid ester/acrylic acid ester rubber graft copolymer, methacrylic acid ester/acrylonitrile/acrylic A resin composition with one or a mixture of two or more core-shell rubbers such as acid ester rubber graft copolymers may be mentioned.

The compounding ratio of the aromatic polycarbonate resin (pc) and the core-shell rubber (core) is preferably 50 to 99 parts by mass of the aromatic polycarbonate resin (pc) when the total of the two is 100 parts by mass. The core-shell rubber (core) is 50 to 1 parts by mass, more preferably the aromatic polycarbonate resin (pc) is 70 to 90 parts by mass, and the core-shell rubber (core) is 30 to 10 parts by mass.

The optional components that may be contained in the aromatic polycarbonate resin composition include thermoplastic resins other than aromatic polycarbonate resins and core shell rubbers; pigments, inorganic fillers, organic fillers, resin fillers; lubricants, antioxidants, weather resistance. Examples thereof include a sex stabilizer, a heat stabilizer, a release agent, an antistatic agent, and an additive such as a surfactant. The blending amount of these optional components is usually about 0.1 to 10 parts by mass, when the total amount of the aromatic polycarbonate resin (pc) and the core shell rubber (core) is 100 parts by mass.

The polyester-based resin sheet (a1) and the transparent polyester-based resin sheet (a1-1) are obtained by using an arbitrary polyester-based resin such as polyethylene terephthalate as the amorphous or low crystalline aromatic polyester-based resin sheet (a11). The transparent amorphous or low crystalline aromatic polyester-based resin sheet (a1-2) is obtained by adding the amorphous or low crystalline aromatic polyester-based resin to the acrylic resin sheet (a2) or the transparent acrylic resin. The resin sheet (a2-1) is the acrylic resin, the aromatic polycarbonate resin sheet (a3) and the transparent aromatic polycarbonate resin sheet (a3-1) are the aromatic polycarbonate resin, for example, calendered. Machine; or by using an extruder and a T-die to form a film.

As the calendering machine, any one can be used, and examples thereof include an upright type 3 roll, an upright type 4 roll, an L type 4 roll, an inverted L type 4 roll, and a Z type roll. You can Any extruder may be used, and examples thereof include a single-screw extruder, a co-rotating twin-screw extruder, and a different-direction rotating twin-screw extruder.

Any T die can be used, and examples thereof include a manifold die, a fish tail die, and a coat hanger die. Further, the obtained polyester resin sheet may be further uniaxially stretched or biaxially stretched.

The door caps 16 and 17, the frame body 36;
The door caps 16 and 17 and the frame 36 are made of synthetic resin material. The door caps 16 and 17 and the frame 36 play an important role in maintaining the strength and rigidity required for the freezer compartment door 11 of the refrigerator, and at least part of the outer shape of the freezer compartment door 11. Is formed.

For the door caps 16 and 17 and the frame 36, for example, acrylonitrile/butadiene/styrene copolymer resin (ABS resin) can be preferably used. The door caps 16 and 17 and the frame 36 can be obtained by molding these resins using, for example, an injection molding machine.

The back panels 20, 40;
The back panels 20 and 40 forming the back surface of the freezer compartment door 11 are integrally formed of a synthetic resin material with a food storage rack and the like, and are provided with a magnet 18 for sealing around the gasket 19 to be mounted. It is attached and fixed so as to cover the front opening of the refrigerator-freezer body 1.

The rear panels 20 and 40 are preferably made of, for example, acrylonitrile/butadiene/styrene copolymer resin (ABS resin) or rubber-modified polystyrene (HIPS) in order to maintain the strength and rigidity required for the freezer compartment door 11. Can be used for. The back panels 20 and 40 can be obtained by molding these resins using, for example, an injection molding machine.

The foam insulation 22, 44;
The foamed heat insulating materials 22 and 44 inject, for example, a stock solution of a foamable resin into the space between the front panels 15 and 35, the back panels 20 and 40, the door caps 16 and 17, and the frame 36. The foam insulation is filled and formed by the in-situ foaming method. It functions to ensure the heat insulation required for the freezer compartment door 11 of the refrigerator. The liquid foaming resin used to obtain the foam insulation materials 22 and 44 is not limited, and any foaming resin can be used. For example, polyurethane resins such as thermosetting polyurethane and thermoplastic polyurethane; polyester resins such as thermosetting polyester and thermoplastic polyester; polystyrene, acrylonitrile/butadiene/styrene copolymer resin (ABS resin), styrene/ethylene/butadiene. A styrene resin such as a styrene copolymer or a styrene/ethylene/butadiene/styrene copolymer; a polyolefin resin such as polyethylene, polypropylene or polymethylpentene; or a mixture of two or more thereof,
Azo compounds such as azodicarboxylic acid amide; nitroso compounds such as N,N′-dinitrosopentamethylenetetramine; carbonates such as sodium bicarbonate and ammonium bicarbonate; organic acids such as citric acid, sodium citrate, oxalic acid; hydrogen A resin composition with one or more foaming agents such as sodium boride; thermal expansion microcapsules; water;

Further, the foamed heat insulating materials 22 and 44, the front panels 15 and 35, the door caps 16 and 17, the frame body 36, and the back panels 20 and 40 are bonded to each other with sufficient strength. Is preferred. Thereby, the rigidity of the freezer compartment door 11 can be increased. In order to bond the foamed heat insulating materials 22 and 44 with sufficient strength, the foamed heat insulating materials 22 and 44 are bonded to the front panels 15 and 35, the door caps 16 and 17, the frame 36, and the back panels 20 and 40. It is preferable to apply an anchor coat to the part in advance before at least injecting the undiluted solution of the expandable resin.

Further, from the viewpoint of the adhesive strength between the front panels 15 and 35 and the foamed heat insulating materials 22 and 44, for example, in the case of injecting a stock solution of urethane-based foamable resin to foam, the front panels 15 and 35 are The surface on the side where the foamed heat insulating materials 22 and 44 are formed is preferably formed of the amorphous or low crystalline aromatic polyester resin sheet. As a result, even without using the anchor coat, the adhesive strength between the foam heat insulating materials 22 and 44 formed of urethane-based foaming resin and the front panels 15 and 35 is sufficient.

Further, for the same reason, for example, in the case of injecting an undiluted solution of a urethane-based foaming resin to foam, a location where the door caps 16 and 17 and the back panels 20 and 40 are bonded to the foam insulation materials 22 and 44. It is also one of the preferred embodiments to use the amorphous or low-crystalline aromatic polyester resin sheet in the portion to be formed.

In addition, although the above-mentioned embodiment was about the drawer-type freezer compartment door 11, it is not limited to such a freezer compartment door, and a drawer-like door, specifically, the drawer shown in this embodiment. The present invention can be applied to the above-described ice making chamber door 9, the temperature switching chamber door 10, the vegetable chamber door 12, and the like, and is not limited to the drawer type, and can also be applied to a double-opening type door or a single-opening type door.

The door body of the refrigerator of the present invention can be understood by those skilled in the art to mean the door body of the device for keeping heat, as can be understood from the embodiment of the freezer door described in the present embodiment. For example, the door body of the present invention can be used for a general refrigerator/freezer, a freezer, a freezer, and the like.

Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention includes various modifications described above without departing from the spirit of the invention. It is intended to cover alternatives, modifications or variations.

1 Freezer/Refrigerator Main Body 11 Freezer Room Doors 15, 35 Front Panels 16, 17 Door Caps 19, 41 Gaskets 20, 40 Rear Panels 22, 44 Foam Insulation Materials 36 Frames 36M Buffer Materials 36N Anchor Materials

Claims (6)

A front panel forming a front surface, a frame body that supports at least a part of an outer end portion of the front panel, a back panel forming a back surface, the front panel, the frame body, and the back panel. A refrigerator door body in which a space is filled with a heat insulating material to open and close a front opening of a refrigerator body,
The front panel is made of a resin sheet having a thickness of 0.5 to 10 mm and a tensile elastic modulus of 1500 MPa or more, and the frame has a shape in which openings inside the frame are separated by vertical bars. Provided with a reinforcing surface portion, at least a part of the surface in contact with the heat insulating material in the space is provided with a cushioning material, the cushioning material has a shape to fit into the opening, the cushioning material, It is installed so as to fit into the opening, and is adhered to at least a part of a surface of the front panel which is in contact with the heat insulating material,
When the volume of the heat insulating material is expanded, the cushioning material is such that the thickness of the buffer material is thin so as to absorb the volume of the expanded heat insulating material in response to the expansion of the heat insulating material. A door of a refrigerator characterized by being present. The heat insulating material is filled so that the cushioning material shrinks,
The cushioning material is capable of preventing the front panel from being deformed so as to shrink when the volume of the heat insulating material is contracted, by the pressure due to the contraction of the heat insulating material. The door of the refrigerator described in. The door body of the refrigerator according to claim 1 or 2, further comprising a second cushioning material arranged between the cushioning material and the heat insulating material. The said 2nd buffer material prevents that the said heat insulating material penetrates into the said buffer material by the said heat insulating material and the said buffer material contacting directly, The said 2nd buffer material is characterized by the above-mentioned. The door of the refrigerator. 5. The resin sheet according to claim 1, wherein the resin sheet is a laminate including a colored resin sheet layer and a transparent resin sheet layer in this order from the surface on the side where the heat insulating material is formed. The door of the refrigerator described. A refrigerator using the door body according to any one of claims 1 to 5 .