JP2005106312A - Refrigerator, vacuum insulation panel and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep the handling performance in manufacturing a vacuum heat insulating panel, and the adsorbing performance of an adsorbent for a long period without lowering the productivity, and further to keep superior heat insulating performance for a long period. <P>SOLUTION: This refrigerator comprises the vacuum heat insulating panel 1 inside of an outer case 22, and a heat insulating body is constituted by filling a foamed heat insulating material 24 between the outer case 22 and an inner case 22. The vacuum heat insulating panel 1 comprises a core material 3, an adsorbing member 4 and a covering material 2 composed of a gas barrier film and accommodating the core material 4 and the adsorbing member. The adsorbing member 4 comprises an adsorbent 9 for adsorbing at least the moisture, and a wrapping material 5 covering the adsorbent 9, through which the water vapor can penetrate, but the water droplets can not penetrate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigerator, a vacuum insulation panel, and a method for manufacturing the same.

  In recent years, from the viewpoint of global warming, the necessity of reducing the power consumption of home appliances has been screamed. In particular, refrigerators are products that consume a large amount of power consumption among household electrical appliances, and reducing the power consumption of refrigerators is indispensable as a measure against global warming. If the load in the refrigerator is constant, the power consumption of the refrigerator is largely determined by the heat insulation performance of the heat insulating material related to the efficiency of the compressor for cooling the refrigerator and the amount of heat leakage from the refrigerator. In this technical development, it is necessary to improve the efficiency of the compressor and the performance of the heat insulating material. As an example of improving the performance of a heat insulating material, use of a vacuum heat insulating panel in which a core material is covered with a jacket material made of a gas barrier film and the inside is sealed under reduced pressure has been used.

  As a conventional vacuum heat insulation panel, there is one disclosed in JP-A-2002-48466 (Patent Document 1). This vacuum heat insulating panel includes a core material, an adsorbing member that adsorbs at least moisture, and an outer covering material that houses these and is made of a gas barrier film. The adsorbent is covered with a packaging material made of a laminated film including a water-resistant Japanese paper layer subjected to water repellent treatment and a polyethylene layer having micropores. Patent Document 1 describes that such a vacuum heat insulation panel is used for a refrigerator or the like.

JP 2002-48466 A

  However, in the vacuum heat insulation panel of Patent Document 1, since the polyethylene layer of the packaging material of the adsorbing member has micropores, when a local force is applied to the packaging material during the manufacturing operation of the vacuum heat insulation panel, the Japanese paper layer is There is a possibility of breaking. When the Japanese paper layer of the packaging material is ruptured, if the sweat or moisture adhering to the operator's hand or arm, or moisture due to condensation from the device, etc., adheres to the broken portion, the capillary effect of the micropores in the polyethylene layer As a result, moisture permeates into the inside of the packaging material, and the adsorption performance of the adsorbent is reduced.

  An object of the present invention is to provide a refrigerator and a vacuum insulation panel that can maintain the adsorption performance of the adsorption member for a long period without impairing the handling and productivity at the time of manufacturing the vacuum insulation panel, and can maintain the excellent insulation performance for a long period of time. And a manufacturing method thereof.

  In order to achieve the above object, the present invention is a refrigerator in which a vacuum heat insulating panel is disposed inside an outer box and a heat insulating material is configured by filling a foam heat insulating material between the outer box and the inner box. The vacuum heat insulation panel includes a core material, an adsorbing member, and an outer jacket material that houses the core material and the adsorbing member and is made of a gas barrier film, and the adsorbing member includes an adsorbent that adsorbs at least moisture. And a packaging material that covers the adsorbent and does not allow water droplets to pass therethrough and allows water vapor to pass therethrough.

  Further, the present invention is a refrigerator in which a vacuum heat insulating panel is disposed inside an outer box and a heat insulating material is formed by filling a foam heat insulating material between the outer box and the inner box. A core material having a short glass fiber material and an inorganic binder, an adsorbing member, and an outer jacket material containing the core material and the adsorbing member and made of a gas barrier film, the core material is composed of a fiber layer, The adsorbent is made of a laminated film of a polyamide film, a polyethylene non-woven fabric, and a polypropylene film, and is covered with a packaging material that does not have micropores, and is disposed in the center of the fiber layer of the core material. It is a feature.

  Further, the present invention provides a vacuum heat insulating panel comprising a core material, an adsorbing member, and an outer cover material that houses the core material and the adsorbing member and is made of a gas barrier film, wherein the adsorbing member contains at least moisture. It comprises an adsorbent to be adsorbed and a packaging material that covers the adsorbent and does not allow water droplets to pass through and allows water vapor to pass therethrough.

  The present invention also relates to a vacuum heat insulating panel comprising a core material having a short glass fiber material and an inorganic binder, an adsorbing member, and an outer jacket material containing the core material and the adsorbing member and made of a gas barrier film. The core material is composed of a fiber layer, and the adsorbent is made of a laminated film of a polyamide film, a polyethylene non-woven fabric and a polypropylene film and is covered with a packaging material having no micropores, and the fiber layer of the core material. It is arrange | positioned in the center part inside.

  In addition, the present invention provides a method for manufacturing a vacuum heat insulating panel in which a core material having a short glass fiber material and an inorganic binder and an adsorbing member are housed in a jacket material made of a gas barrier film, and then the inside of the jacket material is evacuated. The core material is made of a fiber layer, and the adsorbent is made of a laminated film of a polyamide film, a polyethylene non-woven fabric and a polypropylene film and covered with a packaging material having no micropores, and the adsorption material covered with the packaging material After the agent is sandwiched in the fiber layer, the core material is accommodated in the jacket material.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator and vacuum insulation panel which can maintain the adsorption | suction performance of adsorbent for a long term, without impairing the handleability and productivity at the time of manufacture of a vacuum insulation panel, and can maintain the outstanding insulation performance for a long term. And a manufacturing method thereof.

  Hereinafter, the refrigerator of one Example of this invention is demonstrated using FIGS. 1-4. The refrigerator in the present invention includes vending machines, merchandise display shelves, merchandise display cases, cool storage boxes, cooler boxes, refrigeration / freezer cars, etc., in addition to household and commercial refrigeration / freezers.

  First, the configuration of the refrigerator according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a refrigerator showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the main part of FIG.

  The refrigerator includes a heat insulating box 21 that forms a heat insulator, and a heat insulating door that forms a heat insulator. The heat insulating box 21 includes a metal outer box 22, a synthetic resin inner box 23, a plurality of vacuum heat insulating panels 1 disposed inside the outer box 22, and the outer box 22 and the inner box 23. And a foam heat insulating material 24 filled in. The vacuum heat insulation panel 1 is installed in close contact with a predetermined position inside the outer box 22. Specifically, the vacuum heat insulation panel 1 is installed in close contact with the ceiling, left and right side surfaces, the bottom surface, and the back side of the outer box 22. By setting it as the heat insulation box 21 using the vacuum heat insulation panel 1 which concerns, the refrigerator with little heat leak amount and power consumption can be provided.

  The heat insulation box 21 is formed with a plurality of storage chambers whose front surfaces are open. These storage rooms are partitioned from the top in the order of the freezing room and the refrigerating room, and are cooled to a predetermined low temperature suitable for each by a cooler disposed in the storage. In addition, the wall thickness of the heat insulation box 21 is about 20 mm-50 mm.

  Although not shown, the heat insulating door is provided so as to open and close the front opening of each storage chamber. As with the heat insulating box 21, the heat insulating door includes a metal outer box, a synthetic resin inner box, a plurality of vacuum heat insulating panels disposed inside the outer box, and a space between the outer box and the inner box. It consists of foam insulation material filled in. Here, as the foam heat insulating material 24, for example, a hard resin foam such as a hard urethane foam, a phenol foam or a styrene foam is exemplified.

  Among these, a rigid polyurethane foam using cyclopentane and water as a mixed foaming agent is preferable. The rigid polyurethane foam is obtained by reacting an isocyanate with a polyol as a basic raw material in the presence of a foaming agent, a foam stabilizer, and a reaction catalyst.

  The polyol consists of m-tolylenediamine (2,4-tolylenediamine, 2,6-tolylenediamine) and o-tolylenediamine (2,3-tolylenediamine, 3,4-tolylenediamine). As an initiator, an adduct of propylene oxide is mainly used. Other initiators are dihydric alcohol propylene glycol, dipropylene glycol, trihydric alcohol glycerin, trimethylolpropane, polyhydric alcohol diglycerin, methyl glucoside, sorbitol, sucrose, alkylene polyamine ethylenediamine, diethylenetriamine, alkanol. Polyols in which amines such as monoethanolamine, diethanolamine, isopropanolamine, other diaminodiphenylmethane, bisphenol A, and polymethylene polyphenylpolyamine are added with various alkylene oxides are used.

  Diisocyanate diisocyanate polynuclear is mainly used as the isocyanate. Since the isocyanate using the diphenylmethane diisocyanate polynuclear body has a small viscosity difference from the polyether polyol solution, the compatibility with the polyether polyol is improved. By using diphenylmethane diisocyanate polynuclear bodies, the initial reaction is relatively fast and the gelation and curing are slowed, so that the amount of foam expansion at the time of demolding becomes small. If it is a small amount, tolylene diisocyanate isomer mixture, 2,4-isomer 100 parts, 2,4-isomer / 2,6-isomer = 80/20, 65/35 (weight ratio) as well as trade name Mitsui Cosmonate The urethane modified tolylene diisocyanate, allophanate modified tolylene diisocyanate, biuret tolylene diisocyanate, isocyanurate modified tolylene diisocyanate, etc. of TRC, Takeda's Takenate 4040 prepolymer can also be used. As the 4,4'-diphenylmethane diisocyanate, the product name Mitsui Cosmonate M-200, which contains a polynuclear compound of three or more nuclei in addition to the pure product as the main component, diphenylmethane diisocyanate polynuclear product of Millionate MR manufactured by Takeda it can.

  As the foaming agent, it is preferable to use hydrocarbon-based foaming agent cyclopentane and water. 12 to 18 parts by weight of cyclopentane and less than 1.8 parts by weight of water are combined per 100 parts by weight of the polyol mixture. In general, if a large amount of cyclopentane and water is used, the density can be easily reduced. However, if there is a large amount of water, the partial pressure of carbon dioxide in the bubble cell increases and the amount of swelling increases. Inferiority.

  As a reaction catalyst, tetramethylhexamethylenediamine, pentamethyldiethylenetriamine, and a trimerization catalyst can be used in combination to increase the high-speed reaction and cure properties. The blending amount of the reaction catalyst is preferably 2 to 5 parts by weight with respect to 100 parts by weight of the polyol component. Other than that, tertiary amines such as trimethylaminoethylpiperazine, triethylenediamine, tetramethylethylenediamine, trimerization catalyst tris (3-dimethylaminopropyl) hexahydro-S-triazine, slow-acting catalyst dipropylene glycol, potassium carbonate acetate It can be used if the reactivity matches.

  As the foam stabilizer, the foam is uniformly expanded and has a uniform strength because the size of the bubble cell is aligned with the lower surface tension. The blending amount of the foam stabilizer is 1.5 to 4 parts by weight per 100 parts by weight of the polyol component. For example, B-8461 and B-8462 manufactured by Goldschmidt, X-20-1614, X-20-1634 manufactured by Shin-Etsu Chemical, and SZ-1127 and SZ1671 manufactured by Nihon Unica are used.

A rigid polyurethane foam is foamed using the above materials. For example, a PU-30 type foaming machine manufactured by Promart Co., Ltd. is used as the foaming machine. The foaming conditions vary somewhat depending on the type of foaming machine, but usually a liquid temperature of 18 to 30 ° C., discharge pressure of 80 to 150 kg / cm ² , discharge amount of 15 to 30 kg / min, and mold box temperature of 35 to 45 ° C. are preferable. It is.

  Next, the vacuum heat insulation panel 1 of the present embodiment will be described with reference to FIGS. FIG. 3 is a sectional view of the vacuum heat insulation panel 1 shown in FIG. 2 in a single state.

  The vacuum heat insulation panel 1 includes a core material 3, an adsorbing member 4, and an outer covering material 2 that houses the core material 3 and the adsorbing member 4 and is made of a gas barrier film. The vacuum heat insulation panel 1 is configured such that the inside of the jacket material 2 is depressurized in a state where the core member 3 and the adsorbing member 4 covered with the packaging material 5 are inserted into the jacket material 2. It is manufactured by sealing by heat-sealing. The shape of the vacuum heat insulation panel 1 is not specifically limited, The thing of various shapes and thickness is applicable according to the location and workability | operativity applied.

  The core material 3 is produced by bonding a short glass fiber material having an average fiber diameter of 4 μm with a boric acid binder, forming into a plate shape, and performing an aging treatment at 200 ° C. for 1 hour. By this treatment, it is possible to remove a trace amount of water adhering to the core material 3. In addition, you may make it produce the core material 3 by performing the aging process for 1 hour at 200 degreeC after shape | molding the short glass fiber material of average fiber diameter 4micrometer with water glass, and shape | molding.

  For the purpose of dehydration and degassing of the core material 3, it is effective to perform aging of the core before insertion into the jacket material 2. The heating temperature at this time is desirably 110 ° C. or higher, and more preferably 180 ° C. or higher, because it is possible to remove the adhering water as a minimum. As a result of examining the moisture content and water absorption rate, etc. for the optimal aging treatment temperature, the moisture content of the plate-like core material decreased to 1/70 of the core material without treatment in the aging treatment at 180 ° C. for 1 hour. It has also been found that the water absorption rate is less than that at 110 ° C. for 1 hour. Therefore, it is more preferable that the aging temperature of the core material is 180 ° C. or higher.

  As a short glass fiber material, it is preferable that an average fiber diameter is 3-5 micrometers. The short glass fiber material greatly affects the thermal conductivity characteristics and cost depending on the average fiber diameter. Glass wool having an average fiber diameter of 5 μm or more, which has been used as the mainstream of glass fibers, is a material that is easy to put into practical use because it is inexpensive in terms of cost, but its thermal conductivity and deterioration over time are greatly inferior. The reason for this is that the fibers are arranged in the same direction and the fibers are close to the line, and the fibers are double-bonded with a sizing material or a binder agent to reduce the contact thermal resistance, increase the thermal conductivity, and rapidly deteriorate with time. It is thought that it progresses to. On the other hand, if the average fiber diameter is less than 2 μm, the thickness per sheet is thin and the heat insulation performance is poor. Therefore, by increasing the thickness by stacking sheet-like inorganic fiber aggregates, it is possible to reduce thermal conductivity and deterioration with time. However, by stacking sheet-like inorganic fiber aggregates to increase the thickness, the number of sheets used for the core material increases, resulting in poor productivity and high cost. It was also found that when the vacuum heat insulating panel was produced with an average fiber diameter of less than 2 μm, the thickness reduction rate of the core material increased before and after sealing.

  As described above, since the thermal conductivity is increased when the fiber diameter is 5 μm or more, a fiber material that is discontinuous in the heat transfer direction and that effectively uses the contact resistance between the materials is selected. In addition to the contact thermal resistance, the heat flow path becomes zigzag, and a short glass fiber material having an average fiber diameter of 3 to 5 μm is selected from many fiber materials whose thermal resistance increases and thermal conductivity decreases. Therefore, it is possible to achieve both reduction in thermal conductivity and deterioration with time, reduction in thickness reduction rate, and cost reduction.

  In addition, about the fiber direction of a short glass fiber material, what is arranged along with a horizontal direction with respect to the thickness direction of a vacuum heat insulation panel is preferable at the point of heat insulation performance.

  Examples of the inorganic binder include boric acid, water glass, aluminum chelate, colloidal silica, and alumina sol. Of these, boric acid, which has excellent thermal conductivity over time and does not exert a chemical action on the short glass fiber material used for the core material, is most preferable.

  The outer covering material 2 is a polyethylene terephthalate film (12 μm) on which aluminum is deposited as a surface protective layer from the outer layer, an aluminum foil (6 μm) as a gas barrier layer, a high-density polyethylene film (50 μm) as a heat-sealing layer, and scratch resistance. For improvement, the outermost layer is composed of a laminate film using a polyamide film (15 μm) as a surface protective layer. And this jacket material 2 is used as a bag which bonded heat fusion layers together in the end face.

  In the jacket material 2, the outermost layer is for responding to impacts, the intermediate layer is for ensuring gas barrier properties, and the innermost layer is for sealing by thermal fusion. Therefore, all known materials can be used as long as they meet these purposes. Further, as a means for further improvement, a puncture resistance may be improved by applying a surface protective layer to the outermost layer, or two films having an aluminum vapor deposition layer may be provided as an intermediate layer. As the innermost layer to be heat-sealed, polypropylene resin or polyacrylonitrile resin may be used.

  The jacket material 2 will be described more specifically. The jacket material covers the core material in order to provide an airtight portion inside, and the material configuration is not particularly limited. For example, a plastic laminate film made of polyethylene terephthalate resin in the outermost layer, aluminum foil in the intermediate layer, and high-density polyethylene resin in the innermost layer, for example, ethylene-vinyl having a polyethylene terephthalate resin in the outermost layer and an aluminum vapor deposition layer in the intermediate layer Examples include an alcohol copolymer resin (trade name EVAL, manufactured by Kuraray Co., Ltd.), and a plastic laminate film made of a high-density polyethylene resin in the innermost layer in a bag shape. These layers of the jacket material are for the outermost layer to cope with impacts, the intermediate layer is for securing gas barrier properties, and the innermost layer is sealed by heat fusion. Therefore, all known materials can be used as long as they meet these purposes.

  As a means for further improvement, puncture resistance may be improved by applying a polyamide resin or the like to the outermost layer, or two layers of an ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer may be provided as an intermediate layer. . The innermost layer to be heat-sealed is preferably a high-density polyethylene resin from the viewpoint of sealing properties, chemical attack properties, etc. In addition to this, polypropylene resin or polyacrylonitrile resin may be used. As a specific configuration of the material of the jacket material, for example, an aluminum laminated film made of polyamide for the outermost layer, polyethylene terephthalate resin for the second layer, aluminum foil for the third layer, and high-density polyethylene resin for the innermost layer. is there.

  Next, the adsorption member 4 will be described with reference to FIG. 4 is a sectional view of the adsorption member 4 shown in FIG. 3 in a single state.

  The adsorbing member 4 includes an adsorbent 9 that adsorbs at least moisture, and a packaging material 5 that covers the adsorbent 9 and does not allow water droplets to pass but allows water vapor to pass.

  The adsorbent 9 is quicklime containing 93% or more of calcium oxide, using a 2 mm mesh, and using a granular material of 2 mm or less selected by this. In other words, the adsorbent 9 enclosed in the packaging material 5 is preferably quick lime, absorbs the water vapor released from the core material 3 and the water vapor entering from the outside through the jacket material 2, and deteriorates the vacuum heat insulation panel 1 over time. What keeps low is preferable. Preferably, a calcium oxide component having a content of 93% or more, an initial moisture content of 1.5% or less, and a moisture absorption of 40% or more is used. Moreover, the shape of quicklime 9 is not specifically limited, such as a powder, a fine grain, a granule, a tablet, solid form.

  In this example, quick lime is used as the adsorbent component. However, in order to improve the reliability of the vacuum heat insulating panel, gas adsorption of dosonite, hydrotalcite, metal hydroxide, etc. is performed as necessary. It is also effective to use an agent such as an agent or a barium-lithium alloy.

  The packaging material 5 is composed of a laminated film 7 made of a polyamide film 6, a polyethylene non-woven fabric and a polypropylene film having no micropores. Since the packaging material 5 is not easily broken even when a force is locally applied from the outside, the moisture adsorption performance of the quicklime 9 inside the packaging material 5 is mistakenly caused in the insertion operation of the adsorption member 4 at the time of manufacturing the vacuum heat insulating panel 1. There is little risk of lowering. Moreover, since the polyamide film 6 is used for the outermost layer, the water vapor adhering to the core material 3 and the water vapor penetrating the jacket material 2 and penetrating into the vacuum heat insulating panel 1 are permeated to the quick lime 9 inside. It can be adsorbed. As a result, the reliability of the heat insulating performance over a long period of time of the vacuum heat insulating panel 1 can be improved.

  The adsorbing member 4 is inserted into the fiber layer of the core material 3 when the vacuum heat insulating panel 1 is manufactured. By this insertion, an external force equivalent to the atmospheric pressure is applied to the jacket material 2 after the manufacture of the vacuum heat insulating panel 1, but the outer shell material 2 is not damaged or broken by the particles of the adsorbing member 4, and the vacuum is applied. The reliability with respect to the heat insulation performance of the heat insulation panel 1 is not impaired.

  As described above, it is possible to further maintain the moisture adsorption performance of the adsorption member 4 without deteriorating the handleability and workability at the time of manufacturing the vacuum thermal insulation panel 1, and as a result, the thermal insulation performance over a long period of time. It is possible to provide an excellent vacuum heat insulation panel.

It is a perspective view of the refrigerator which shows one Example of this invention. It is principal part sectional drawing of FIG. It is sectional drawing of the single state of the vacuum heat insulation panel shown in FIG. It is sectional drawing of the single state of the adsorption | suction member shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vacuum insulation panel, 2 ... Cover material which consists of gas barrier film, 3 ... Core material, 4 ... Adsorption member, 5 ... Packaging material, 6 ... Polyamide film, 7 ... Laminated film which consists of polyethylene nonwoven fabric and polypropylene film, 9 ... adsorbent, 21 ... heat insulation box, 22 ... outer box, 23 ... inner box, 24 ... foam insulation.

Claims (7)

In the refrigerator in which a vacuum heat insulating panel is disposed inside the outer box and a heat insulating material is configured by filling a foam heat insulating material between the outer box and the inner box,
The vacuum heat insulation panel includes a core material, an adsorbing member, and an outer covering material that houses the core material and the adsorbing member and is made of a gas barrier film.
The said adsorbing member is provided with the adsorbent which adsorb | sucks a water | moisture content at least, and the packaging material which covers the said adsorbent and does not let a water drop pass, and lets water vapor | steam pass. In the refrigerator in which a vacuum heat insulating panel is disposed inside the outer box and a heat insulating material is configured by filling a foam heat insulating material between the outer box and the inner box,
The vacuum heat insulation panel includes a core material having a short glass fiber material and an inorganic binder, an adsorption member, and an outer jacket material that houses the core material and the adsorption member and is made of a gas barrier film.
The core material is composed of a fiber layer,
The adsorbing member is made of a laminated film of a polyamide film, a polyethylene non-woven fabric, and a polypropylene film, and is covered with a packaging material having no micropores, and is disposed in the fiber layer of the core material. . In a vacuum heat insulating panel comprising a core material, an adsorbing member, and a jacket material containing the core material and the adsorbing member and made of a gas barrier film,
The adsorbing member includes an adsorbent that adsorbs at least moisture, and a packaging material that covers the adsorbent and does not allow water droplets to pass but allows water vapor to pass.   The vacuum heat-insulating panel according to claim 3, wherein the adsorbent is made of a laminated film of a polyamide film, a polyethylene non-woven fabric, and a polypropylene film and is covered with a packaging material having no fine holes. In a vacuum insulation panel comprising a core material having a short glass fiber material and an inorganic binder, an adsorbing member, and an outer jacket material containing the core material and the adsorbing member and made of a gas barrier film,
The core material is composed of a fiber layer,
The adsorbing member is made of a laminated film of a polyamide film, a polyethylene non-woven fabric, and a polypropylene film, and is covered with a packaging material having no micropores, and is disposed in the fiber layer of the core material. Vacuum insulation panel.   The vacuum heat insulating panel according to claim 3, wherein the adsorbent is quick lime. In a method for manufacturing a vacuum heat insulating panel in which a core material having a short glass fiber material and an inorganic binder and an adsorbing member are housed in a jacket material made of a gas barrier film, and the inside of the jacket material is evacuated,
The core material is manufactured with a fiber layer,
The adsorbent is made of a laminated film of a polyamide film, a polyethylene non-woven fabric and a polypropylene film and covered with a packaging material having no micropores,
After sandwiching the adsorbent covered with the packaging material in a fiber layer,
The said core material is accommodated in the said jacket material. The manufacturing method of the vacuum heat insulation panel characterized by the above-mentioned.

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