Flame-retardant plastic material and home appliance comprising same

Abstract

A flame-retardant plastic composition according to an embodiment of the present disclosure comprises a polypropylene (PP)-based resin, a phosphorus / nitrogen-based compound, an anti-hydrolysis agent, and talc, wherein the phosphorus / nitrogen-based compound may include at least one of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP).

Description

Flame-retardant plastic materials and home appliances containing the same

[0001] One embodiment disclosed in this document relates to a flame-retardant plastic material, and more specifically, to a flame-retardant plastic material for a housing included in a home appliance.

[0002] In order to prevent fire hazards that may occur in home appliances and to limit the spread of fire in the event that components within the appliance ignite, internal and external components for home appliances may be manufactured from flame-retardant materials. For example, fire spread can be prevented by applying flame-retardant materials to the internal and external surfaces of the home appliance, including the casing surrounding the printed circuit board (PCB) for the appliance.

[0003] To prevent the spread of fire, multiple parts for home appliances can be produced by bending metal materials (e.g., steel plates), but this can cause process complexity and increase production costs. Therefore, there is a trend toward using integrated parts made of flame-retardant plastic materials to prevent the spread of fire in home appliances.

[0004] Meanwhile, due to the recent tightening of international environmental regulations, the use of halogen-based (e.g., bromine (Br)) flame retardants in flame-retardant materials is being restricted. This is because when halogen-based flame-retardant plastic materials are burned, substances harmful to the human body and the environment, such as dioxins and furans, are produced. Therefore, to mitigate harmful substances, flame-retardant materials can be manufactured using nitrogen-based materials; however, in the case of nitrogen-based flame-retardant materials, when exposed to high temperature and high humidity environments, a whitening phenomenon (or blooming phenomenon) in which powder comes off the surface may occur, which may degrade the aesthetic appeal of the appearance.

[0005] The information described above may be provided as related art for the purpose of aiding understanding of the present disclosure. No claim or determination is made as to whether any of the foregoing may be applied as prior art related to the present disclosure.

[0006] A flame-retardant plastic material according to one embodiment of the present disclosure may be composed of a compound that includes a phosphorus / nitrogen-based compound, provides a flame-retardant function of a predetermined level or higher, and can reduce the occurrence of blooming.

[0007] A flame-retardant plastic composition according to one embodiment of the present disclosure comprises a polypropylene (PP) resin, a phosphorus / nitrogen compound, an antihydrolysis agent, and talc, wherein the phosphorus / nitrogen compound may comprise one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP).

[0008] A dryer according to one embodiment of the present disclosure may include a main body having an opening formed for introducing or receiving a material to be dried, a drum rotatably disposed inside the main body, a door hinged to one side of the main body to open and close the opening, and a heat pump configured to generate drying air supplied to the drum, comprising an evaporator, a compressor, a condenser, and an expansion valve. The door may include a front cover formed to correspond to the inlet, a first rim cover disposed to surround the edge of the front cover, a cover supporter disposed at the rear of the front cover and supporting the front cover, a holder disposed at the rear of the cover supporter and disposed to be connectable to the cover supporter, a second rim cover disposed at the rear of the first rim cover, and a rear cover disposed to be surrounded by the second rim cover. One or more of the holder, the second rim cover, and the rear cover may be made of a flame-retardant plastic material. The flame-retardant plastic material may include a phosphorus / nitrogen-based compound comprising one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP), a polypropylene (PP)-based resin, an antihydrolysis agent, and talc.

[0009] A flame-retardant plastic material according to one embodiment of the present disclosure comprises a phosphorus / nitrogen-based compound and can reduce the occurrence of blooming under high temperature and high humidity conditions.

[0010] A flame-retardant plastic material according to one embodiment of the present disclosure can be manufactured with a low-cost composition, thereby increasing productivity.

[0011] However, the problems to be solved in this disclosure are not limited to those mentioned above, and may be determined in various ways without departing from the spirit and scope of this disclosure.

[0012] FIG. 1 illustrates the material appearance of a flame-retardant plastic composition according to one embodiment of the present disclosure.

[0013] FIG. 2 illustrates the material appearance of a flame-retardant plastic composition according to one embodiment of the present disclosure.

[0014] FIG. 3 illustrates the morphology of a flame-retardant plastic composition according to one embodiment of the present disclosure.

[0015] FIG. 4 is a perspective view of a dryer according to one embodiment of the present disclosure.

[0016] FIG. 5 is an exploded perspective view of a door included in a dryer according to one embodiment of the present disclosure.

[0017] FIG. 6 is a perspective view of a door viewed from the rear, according to one embodiment of the present disclosure.

[0018] FIG. 7 is a perspective view of a hood device according to one embodiment of the present disclosure.

[0019] FIG. 8 is a perspective view of a refrigerator according to one embodiment of the present disclosure.

[0020] FIG. 9 is an exploded perspective view focusing on a substrate assembly included in a refrigerator according to one embodiment of the present disclosure.

[0021] The embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of said items unless the relevant context clearly indicates otherwise. In this document, phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B or C," "at least one of A, B and C," and "at least one of A, B, or C" may each include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used simply to distinguish said components from other said components and do not limit said components in any other aspect (e.g., importance or order).

[0022] Hereinafter, in this document, "front-back direction," "left-right direction," and "up-down direction" may be used based on the illustrated drawings, and the shape and position of each component are not limited by this.

[0023] According to one embodiment, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components.

[0024] The home appliances described below (e.g., the dryer (400) of FIG. 4, the hood device (700) of FIG. 7, and the refrigerator (800) of FIG. 8) are to be understood as being illustrative for the purpose of facilitating understanding of the present disclosure and may be implemented with various modifications. Additionally, some of the attached drawings may not be drawn to actual scale and the dimensions of some components may be exaggerated to facilitate understanding of the present disclosure.

[0025] FIG. 1 illustrates the material appearance of a flame-retardant plastic composition according to one embodiment of the present disclosure.

[0026] FIG. 2 illustrates the material appearance of a flame-retardant plastic composition according to one embodiment of the present disclosure.

[0027] FIG. 3 illustrates the morphology of a flame-retardant plastic composition according to one embodiment of the present disclosure, captured by a scanning electron microscope (SEM).

[0028] FIGS. 1 and 2 illustrate the material appearance of each example and comparative example to distinguish whether a whitening phenomenon (blooming phenomenon) occurs due to the material appearance of the illustrated flame-retardant plastic composition. In addition, FIG. 3 illustrates the difference in dispersibility of the flame-retardant plastic composition for each example.

[0029] Referring to FIGS. 1 to 3, the flame-retardant plastic composition of the present disclosure is a material capable of manufacturing parts included in home appliances (e.g., the dryer (400) of FIG. 4, the hood device (700) of FIG. 7, and the refrigerator (800) of FIG. 8), and can provide a flame-retardant function of a certain level or higher that can prevent the spread of fire when a fire occurs. The flame-retardant plastic composition is a halogen-free composition that does not contain halogen substances, and can limit the generation of harmful substances such as dioxin and / or furan when the composition is burned.

[0030] According to one embodiment, the flame-retardant plastic composition of the present disclosure can reduce the occurrence of blooming under high temperature and high humidity conditions. Blooming refers to a phenomenon in which the surface of a plastic becomes cloudy when it is bent by an external force applied to it, or a phenomenon in which crystals (or powder) form on the surface of a plastic when it is exposed to high temperature and high humidity conditions for a predetermined period. When blooming occurs in plastic parts applied to home appliances, the appearance quality may deteriorate, durability may be weakened, and aesthetic appeal may be reduced.

[0031] The flame-retardant plastic composition of the present disclosure described below, by mixing component materials according to a predetermined composition ratio, can provide flame retardancy while reducing the occurrence of whitening under high temperature and high humidity conditions. Furthermore, unless otherwise noted, regarding the numerical limitations of the materials constituting the flame-retardant plastic composition, it can be understood that the content of each composition component is approximate based on the total weight (100 wt%) of the flame-retardant plastic composition.

[0032] According to one embodiment, the flame-retardant plastic composition may comprise a polypropylene-based resin, a phosphorus / nitrogen-based compound, an antihydrolysis agent, a filler, and other additives in a predetermined ratio.

[0033] According to one embodiment, the polypropylene-based resin may comprise one or more of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer. For example, the polypropylene-based resin may be composed of any one of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer, or may be formed by mixing two or more of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer.

[0034] According to one embodiment, the polypropylene-based resin may have a predetermined fluidity. For example, the polypropylene-based resin may have a melt flow index (MFI) of 10 to 50 g / 10 min at 230°C and a 2.16 kg load in accordance with ASTM D1238.

[0035] According to one embodiment, the flame-retardant plastic composition may further include synthetic rubber. The synthetic rubber may be used as an auxiliary resin to improve the impact strength of the flame-retardant plastic composition. The synthetic rubber may be composed in a predetermined ratio with respect to the composition ratio of the polypropylene-based resin.

[0036] According to one embodiment, the synthetic rubber is low-density polyethylene (LDPE), linear low-density polyethylene (linear LLDPE), ethylene-alpha-olefin (ethylene-α-olefin) copolymer, propylene-alpha-olefin (propylene-α-olefin) copolymer, ethylene vinyl acetate (EVA) copolymer, ethylene-methyl acrylate (EMA) copolymer, ethylene-ethyl acrylate (EEA), ethylene-butyl acrylate (EBA), styrene-butadiene-styrene (SBS) rubber, styrene-ethylene-butadiene-styrene (SEBS) copolymer, ethylene-propylene-diene monomer (EPDM) rubber, ethylene glycol dimethacrylate (EDM) rubber, copolymer, and polyolefin. It may include one or more polyolefin elastomers (POE). For example, the synthetic rubber may be composed of a single material among the materials applicable to the synthetic rubber, or may be composed of a mixture of two or more materials.

[0037] According to one embodiment, the polypropylene-based resin may be composed of about 50 to 70 weight percent relative to the total weight of the flame-retardant plastic composition. For example, when synthetic rubber is added to the polypropylene-based resin to improve the impact strength of the flame-retardant plastic composition, the ratio of the mixture of the polypropylene-based resin and the synthetic rubber may be composed of about 50 to 70 weight percent relative to the total weight of the flame-retardant plastic composition.

[0038] According to one embodiment, the production cost per unit mass of a polypropylene-based resin may be lower than that of a polyester-based resin. Therefore, the production cost of the flame-retardant plastic composition of the present disclosure may be lowered, thereby improving productivity.

[0039] According to one embodiment, a phosphorus / nitrogen-based compound can improve flame retardancy. The phosphorus / nitrogen-based compound may include one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP).

[0040] According to one embodiment, piperazine pyrophosphate has a relatively high melting point of 200°C or higher, so it can maintain a stable polymeric state under high temperature conditions. As a result, piperazine pyrophosphate can be robust under high temperature and high humidity conditions.

[0041] According to one embodiment, the phosphorus / nitrogen-based compound can minimize hydrolysis at high temperatures. For example, piperazine pyrophosphate included in the phosphorus / nitrogen-based compound may have a certain water resistance.

[0042] According to one embodiment, the phosphorus / nitrogen-based compound may be composed of about 20 to 35 weight percent relative to the total weight of the flame-retardant plastic composition.

[0043] According to one embodiment, the filler may include inorganic materials such as talc (or talc), feldspar powder, barite, mica, gypsum, or magnesium oxide (MgO). For example, the filler may include talc.

[0044] According to one embodiment, when talc is used as the filler, the particle size of the talc can be determined by considering the tensile strength and fluidity of the flame-retardant plastic composition. For example, if the particle size of the talc is too small, the tensile strength of the flame-retardant plastic material may be reduced, and if the particle size of the talc is too large, the fluidity of the flame-retardant plastic material may be reduced.

[0045] According to one embodiment, when talc is used as a filler included in a flame-retardant plastic composition, talc having a particle size of about 0.4 to 100 μm (micrometer) can be used. For example, talc having a particle size of about 1 to 20 μm can be used as a filler. As a result, the physical properties of the flame-retardant plastic composition can be improved. In addition, since the cost of talc having the above particle size is relatively low, the production costs required when producing the flame-retardant plastic composition can be reduced and productivity can be improved.

[0046] According to one embodiment, the filler can improve the physical properties of the flame-retardant plastic composition. For example, the filler included in the flame-retardant plastic composition can improve flame retardancy. However, if the composition ratio of the filler exceeds a critical value, the impact strength and flexibility of the flame-retardant plastic composition may decrease. Therefore, the filler may be limited to 5 to 20 weight percent relative to the total weight of the flame-retardant plastic composition. For example, the talc content may be composed of 10 to 15 weight percent relative to the total weight of the flame-retardant plastic composition.

[0047] According to one embodiment, the hydrolysis inhibitor may include one or more of a polycarbodiimide-based compound, an oxazoline-based compound, and an epoxy-based compound. For example, the hydrolysis inhibitor may be composed of a single compound of any one of a polycarbodiimide-based compound, an oxazoline-based compound, and an epoxy-based compound, or may be composed of a mixture of two or more of them.

[0048] According to one embodiment, a hydrolysis inhibitor can improve the blooming phenomenon when a flame-retardant plastic composition is exposed to high temperature and high humidity conditions.

[0049] According to one embodiment, the flame-retardant plastic composition may further include other additives for improving physical properties. For example, other additives may include heat stabilizers, lubricants, light stabilizers, antistatic agents, slip agents, nucleating agents, pigments, and dyes.

[0050] According to one embodiment, the combined composition ratio of the hydrolysis inhibitor and other additives may be about 1 to 5 weight percent relative to the total weight of the flame-retardant plastic composition.

[0051] As described above, by controlling the compositional components of the flame-retardant plastic composition, the flame-retardant plastic composition according to one embodiment of the present disclosure can achieve the following physical properties.

[0052] According to one embodiment, the flame-retardant plastic composition may have a certain flame retardancy. For example, the flame retardancy may be measured by passing the Bar test according to UL94. For example, the flame-retardant plastic composition may have a flame retardancy rating of 1.5T V0 or higher.

[0053] According to one embodiment, the flame-retardant plastic composition may have a predetermined impact strength. The impact strength may be measured at room temperature using a 3.2T specimen in accordance with ASTM D256 standards. For example, the impact strength of the flame-retardant plastic composition may be about 1 to 10 kgf·cm / cm. For example, the impact strength may be about 2.5 to 4.5 kgf·cm / cm. For example, if the impact strength of the flame-retardant plastic composition is low, cracks may occur on the exterior when applied to home appliances. For example, if the impact strength of the flame-retardant plastic composition is too high, productivity may decrease due to reduced fluidity.

[0054] According to one embodiment, the flame-retardant plastic composition may have a predetermined tensile strength. For example, the tensile strength may be measured at room temperature at a speed of 50 mm / min in accordance with ASTM D638. For example, the tensile strength of the flame-retardant plastic composition is approximately 150 to 600 kgf / cm² 2 It may be. For example, the tensile strength is about 200 to 280 kgf / cm² 2 This may be the case. For example, if the tensile strength of the flame-retardant plastic composition is low, deformation or cracking may occur during the home appliance assembly process. For example, if the tensile strength of the flame-retardant plastic composition is too high, productivity may decrease due to poor fluidity.

[0055] According to one embodiment, the flame-retardant plastic composition may have a predetermined flexural modulus. For example, the flexural modulus may be measured at room temperature at a rate of 2.8 mm / min in accordance with ASTM D790. For example, the flexural modulus of the flame-retardant plastic composition is approximately 16,000 to 50,000 kgf / cm² 2 It may be. For example, the flexural modulus is about 18,000 to 27,000 kgf / cm 2 It could be.

[0056] According to one embodiment, the flame-retardant plastic composition may have a predetermined melt flow index (MFI). For example, the melt flow index may be measured under conditions of 230°C and 2.16 kg in accordance with ASTM D1238. For example, the melt flow index of the flame-retardant plastic composition may be about 4.0 to 40 g / 10 min at 230°C and a 2.16 kg load. For example, the melt flow index may be about 5.0 to 10 g / 10 min. For example, if the melt flow index of the flame-retardant plastic material is low, injection molding may become difficult. For example, if the melt flow index of the flame-retardant plastic material is high, tensile strength and impact strength may be inferior.

[0057] According to one embodiment, the flame-retardant plastic composition may have a predetermined heat deflection temperature (HDT). For example, the heat deflection temperature may be measured under 0.45 kg conditions in accordance with ASTM D648. For example, the heat deflection temperature of the flame-retardant plastic composition may be about 95 to 160°C. For example, the heat deflection temperature may be about 100°C to 135°C. If the heat deflection temperature is low, deformation may occur during the high-temperature assembly process. However, if the heat deflection temperature is too high, fluidity may decrease, and productivity may be inferior.

[0058] A method for manufacturing a flame-retardant plastic composition according to one aspect of the present disclosure may be manufactured by mixing a material (e.g., a precursor) included in the flame-retardant plastic composition. The manufacturing method may include, for example, the step of mixing a polypropylene-based resin, a phosphorus / nitrogen-based compound, an anti-hydrolysis agent, a filler, and other additives included in the flame-retardant plastic composition, and the step of extruding the mixture.

[0059] According to one embodiment, the step of mixing the precursors is not subject to any particular limitations, but a mechanical shearing method using a twin-screw extruder to knead each precursor may be used. For example, the extrusion step may be performed at approximately 180 to 230°C. For example, if the temperature at which the extrusion step is performed is low, the manufacturing process may be delayed and productivity may decrease. For example, if the temperature at which the extrusion step is performed is too high, there is a high possibility that magnesium hydroxide will decompose. Taking this into consideration, the extrusion step may be performed at approximately 180 to 230°C.

[0060] Referring to FIGS. 1 and 2, the surface appearance according to the composition ratio of the flame-retardant plastic composition is illustrated. FIG. 1 illustrates the surface appearance according to the mixing ratio of the materials included in the compositions of Example 1, Example 2, and Example 3, respectively, and FIG. 2 can be understood as illustrating the surface appearance according to the mixing ratio of the materials included in the compositions of Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively. Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 can be manufactured into a fillet by mixing according to the mixing ratio of each component listed in below, adding 0.1 weight parts of an antioxidant, and then extruding through a conventional twin-screw extruder at 200°C. The fillet can be defined as having been dried at 75°C for 2 hours, and then injected in a small injection molding machine under conditions of a molding temperature of 200°C and a mold temperature of 60°C to produce a specimen.

[0061] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Polypropylene resin 555865555568 Piperazine pyrophosphate 3030301500 Melamine cyanurate 0005255 Triethyl phosphate 00010525 Talc 1010010100 Hydrolysis inhibitor 303330 Other additives 222222

[0062] According to one embodiment, the following describes the physical properties of a flame-retardant plastic composition, and shows whether the composition passed the flame retardancy test, impact strength, tensile strength, flexural modulus, flow index, and whether blooming occurred according to the mixing ratios of Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 of .

[0063] FIGS. 1 and 2 illustrate the surface appearance of compositions according to the mixing ratios of Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 of , as well as the occurrence of blooming under high temperature and high humidity conditions. The occurrence of blooming can be evaluated by the appearance of specimens prepared with the composition ratios of after exposure to 60°C and 95%RH conditions for 48 hours. For example, if crystals (or powder) appear on the surface under these conditions, it can be defined as blooming.

[0064] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Flame Retardancy Test Passed (O / X) Tensile Strength [kgf / cm 2 ]250260200210200180 Flexural modulus[kgf / cm 2 ]25,200 26,000 17,000 26,000 24,000 16,000 Impact Strength [kgf·cm / cm] 2.7 3.0 4.0 3.5 3.7 3.8 Flow Index [g / 10min] 9 10 12 10 9.2 15 Presence of Blooming (Figs. 1, 2) XOXOOO

[0065] According to one embodiment, whether the flame retardancy test was passed was indicated as 'O' if the V0 test was passed according to the UL94 standard. All of Examples 1 to 3 and Comparative Examples 1 to 3 passed the flame retardancy test.

[0066] According to one embodiment, Examples 1 to 3 satisfied suitable physical properties in terms of tensile strength, flexural modulus, impact strength, and flow index. However, referring to FIG. 1, Example 2 did not contain a hydrolysis inhibitor, so blooming occurred under high temperature and high humidity conditions.

[0067] According to one embodiment, Comparative Example 1 and Comparative Example 2 satisfied suitable physical properties in terms of flexural modulus, impact strength, and flow index. However, referring to FIG. 2, in Comparative Example 1, a blooming phenomenon occurred under high temperature and high humidity conditions because the mixing ratio of piperazine pyrophosphate, a phosphorus / nitrogen-based compound, was below a critical level. In addition, in Comparative Example 2, a blooming phenomenon occurred under high temperature and high humidity conditions because piperazine pyrophosphate, a phosphorus / nitrogen-based compound, was not included, and melamine phosphate, a separate nitrogen-based compound, and triethyl phosphate, a phosphorus-based compound, were mixed separately. For example, melamine-based compounds such as melamine phosphate are water-soluble, so under high humidity conditions, the flame retardant precipitates and crystals form as it dissolves in water, which can cause a blooming phenomenon. For example, triethyl phosphate has a relatively low melting point of -57°C, which can lower the glass transition temperature (Tg) of the entire composition, and this can cause the composition to change into a liquid state and become sticky under high temperature and high humidity conditions.

[0068] According to one embodiment, the flame-retardant plastic composition of the present disclosure can reduce blooming under high temperature and high humidity conditions by including a phosphorus / nitrogen-based compound in a predetermined ratio. This can be confirmed by the degree of particle dispersibility in the morphology of FIG. 3.

[0069] Referring to FIG. 3, the compositions of Example 1 and Comparative Example 2 of Tables 1 and 2 above are scanned electron microscope (SEM) images. FIG. 3 is a magnified image of each composition of Example 1 and Comparative Example 2 at 270x magnification.

[0070] According to one embodiment, in the case of the flame-retardant plastic composition of Example 1, it can be confirmed that the particles are uniformly distributed and the dispersibility is improved by including piperazine pyrophosphate, which is a phosphorus / nitrogen-based compound, and in the case of the flame-retardant plastic composition of Comparative Example 2, it can be confirmed that the dispersibility of melamine phosphate particles is reduced because the nitrogen-based compound and the phosphorus-based compound are mixed separately, thereby reducing the dispersibility of the melamine phosphate particles on the matrix formed by the polypropylene resin. Due to the reduced dispersibility of each material constituting the composition, the composition is poor at hydrolysis under high temperature and high humidity conditions, and blooming may occur.

[0071] A flame-retardant plastic composition according to one embodiment of the present disclosure can be applied to various types of home appliances. For example, the flame-retardant plastic composition of FIGS. 1 to 3 can be applied to a dryer (e.g., the dryer (400) of FIG. 4), a hood device (e.g., the hood device (700) of FIG. 7), and a refrigerator (e.g., the refrigerator (800) of FIG. 8). However, it is not limited to those illustrated and can be applied to various types of home appliances. The flame-retardant plastic composition can be applied, for example, to exterior parts or parts placed in areas exposed to high temperature and high humidity among the parts applied to home appliances. Due to the flame-retardant plastic composition of the present disclosure having a certain flame retardancy and robustness against whitening, the durability of the home appliance can be improved and the aesthetic appearance can be enhanced. Home appliances to which the flame-retardant plastic composition of the present disclosure is applicable will be described in FIG. 4 and below.

[0072] FIG. 4 is a perspective view of a dryer (400) according to one embodiment of the present disclosure.

[0073] The dryer (400) illustrated in FIG. 4 may include a configuration made of the flame-retardant material of the present disclosure described in FIG. 1 to 3 (e.g., Example 1 and Example 3 of FIG. 1 to 3).

[0074] The embodiment of FIG. 4 can be optionally combined with the embodiments of FIG. 1 to 3.

[0075] Referring to FIG. 4, the dryer (400) may include a cabinet (410) forming an exterior and a drum (420) rotatably disposed within the cabinet (410).

[0076] According to one embodiment, the cabinet (410) may be formed in the shape of a roughly cuboid. For example, an inlet may be formed on the front of the cabinet (410) for inserting and / or withdrawing clothing, which is the object to be dried (or object to be dried), into and / or withdrawing it from the drum (420).

[0077] According to one embodiment, the cabinet (410) may include a front plate (412) forming the front surface, a top plate (413) forming the top surface, a side plate (414) forming the side surface, a rear plate (415) covering the rear surface, and a bottom plate (416) forming the bottom surface. For example, the front plate (412) forming the front surface of the cabinet (410), the top plate (413), the side plate (414), the rear plate (415), and the bottom plate (416) may be assembled separately. For example, at least two of the front plate (412), the top plate (413), the side plate (414), the rear plate (415), and the bottom plate (416) may be formed integrally.

[0078] According to one embodiment, the cabinet (410) may include an input port (412a) formed on the front plate (412) to allow the material to be dried to be introduced into the drum (420) or the material to be dried to be withdrawn from the drum (420). The cabinet (410) may include an input / output panel (411) provided on the upper side of the front plate (412) to display various information about the dryer (400) or to input control commands.

[0079] According to one embodiment, the input / output panel (411) may include an input unit that receives input for a control operation of the dryer (400). The input unit may be implemented in the form of a jog dial or a button. The input / output panel (411) may include a display that displays the operating status or information of the dryer (400).

[0080] According to one embodiment, the dryer (400) may include a door (500) formed to be able to open and close an input port (412a). The door (500) may be hinge-connected to one side of the front plate (412) and positioned to be pivotable relative to the side connected to the front plate (412).

[0081] According to one embodiment, the dryer (400) may include a drum drive (driver) (not shown) that rotates the drum (420). The drum drive may include a drive motor, a pulley that transmits power from the drive motor to the drum (420), and a belt. The pulley is connected to the shaft of the drive motor, and the pulley can rotate by the rotation of the drive motor. The belt is arranged to be wound around the outer surface of the pulley and the outer surface of the drum (420), and the belt and the drum can rotate together by the rotation of the pulley.

[0082] According to one embodiment, the dryer (400) may include a heat pump (not shown) that supplies drying air into the drum (420). The heat pump may include an evaporator, a condenser, a compressor, and an expansion device. The compressor compresses the refrigerant to a high temperature and high pressure state and discharges it, and the discharged refrigerant may flow into the condenser. The condenser condenses the compressed refrigerant and can release heat to the surroundings through the condensation process. The expansion valve can expand the refrigerant in a high temperature and high pressure state condensed in the condenser (72) to a low pressure state. The evaporator evaporates the expanded refrigerant and can remove heat from the surroundings through the evaporation process. For example, the heat pump may further include a heater configured to heat the drying air.

[0083] According to one embodiment, the heat pump can be mounted on a base located at the bottom of the dryer (400).

[0084] According to one embodiment, the dryer (400) may include a supply path forming a path for drying air to be introduced into a drum (420), and a discharge path forming a path for air that has passed through the drum (420) to be discharged from the drum (420) toward a heat pump. For example, the outlet of the supply path may be connected to the rear of the drum (420), and the inlet of the supply path may be connected to the heat pump. For example, the inlet of the discharge path may be positioned to be connected to the front lower part of the drum (420). The outlet of the discharge path may be connected to the heat pump. When the door (500) of the dryer (400) is closed, the supply path, the drum, and the discharge path may form a closed loop.

[0085] According to one embodiment, the discharge path may include a filter case, one side of which is in communication with the interior of a drum (420) and the other side of which is in communication with a heat pump, and a filter (465) installed inside the filter case to filter foreign substances contained in the air passing through the filter case. The filter (465) may be detachably disposed in the filter case.

[0086] According to one embodiment, the air used to dry the material to be dried in the drum (420) can be discharged into a filter case. The air introduced into the filter case can be filtered of foreign substances by a filter (465). A mesh-shaped filter grille may be placed at the inlet of the filter case.

[0087] According to one embodiment, the dryer (400) may include a blower fan that generates a flow of drying air. The blower fan is rotated by a drive motor and can generate a flow so that air can move along a supply path, a drum, and an exhaust path.

[0088] According to one embodiment, as the dryer (400) performs a drying process, high-temperature drying air may be introduced into the interior of the drum (420). The drying air may come into contact with the door (500) located at the front of the drum (420) and move toward the discharge path located at the bottom of the door (500). For example, when the dryer (400) performs a drying process, the rear cover (e.g., rear cover (570) in FIG. 5 and 6) and the glass (e.g., glass (580) in FIG. 5 and 6) located at the rear of the door (500) close the inlet (412a), thereby forming an air flow path leading from the drum (420) to the filter (465) and the discharge path.

[0089] FIG. 5 is an exploded perspective view of a door (500) (e.g., door (500) of FIG. 4) included in a dryer (e.g., dryer (400) of FIG. 4) according to one embodiment of the present disclosure.

[0090] FIG. 6 is a perspective view of a door (500) viewed from the rear, according to one embodiment of the present disclosure.

[0091] The embodiments of FIGS. 5 and 6 can be optionally combined with the embodiment of FIG. 4.

[0092] Referring to FIGS. 5 and 6, the door (500) may be configured to open and close an inlet (e.g., an inlet (412a) in FIG. 4). The door (500) may include a front cover (510) and a first rim cover (530) positioned to surround the rim of the front cover (510).

[0093] According to one embodiment, the front cover (510) may be formed in a roughly circular shape. The front cover (510) may be formed larger than the inlet (52a) to cover the inlet (412a). The front cover (510) may be made of a material that allows the inside of the drum (420) to be seen. For example, the front cover (510) may be made of a transparent plastic or glass material.

[0094] According to one embodiment, the first rim cover (530) may be formed in a band shape to extend along the rim of the front cover (510) and surround the first rim opening (530a) formed at the center. The first rim cover (530) may cover the rim of the front cover (510). For example, the first rim cover (530) may be extended from the edge of the front cover body (511) of the front cover (510) so that the portion viewed from the front becomes wider as it extends toward the rear.

[0095] According to one embodiment, the door (500) may include a cover supporter (520) positioned at the rear of the front cover (510) to support the front cover (510). The cover supporter (520) may be positioned on the inner side of the first rim cover (530).

[0096] According to one embodiment, the cover supporter (520) may include a supporter opening (520a) at the center. The cover supporter (520) may be formed to surround the supporter opening (520a) and may be bent backward toward the center of the supporter opening (520a). The cover supporter (520) may include a supporter boss (529) formed toward the rear. The supporter boss (529) may be provided in multiple numbers. The cover supporter (520) may include an insert (527) provided to be coupled with the first rim cover (530).

[0097] According to one embodiment, the door (500) is positioned at the rear of the cover supporter (520) and may include a holder (540) that can be coupled to the cover supporter (520). The holder (540) may be formed to be rotatable by the cabinet (e.g., cabinet (410) of FIG. 4) by means of a door hinge (560). The holder (540) may be formed to seal the inside and outside of the drum (420).

[0098] According to one embodiment, the holder (540) may include a holder opening (540a). The holder opening (540a) may be in communication with a supporter opening (520a).

[0099] According to one embodiment, the holder (540) may include a holder boss portion (549). The holder boss portion (549) may be provided in multiple numbers by being disposed on the edge portion of the holder (540). The holder boss portion (549) may be formed at a position corresponding to the supporter boss portion (529) of the cover support (520).

[0100] According to one embodiment, the door (500) may include a second rim cover (550) positioned behind the first rim cover (530).

[0101] According to one embodiment, the second rim cover (550) may be positioned behind the first rim cover (530) and formed into a roughly circular rim shape. The second rim cover (550) may be positioned on the edge of the holder (540). The second rim cover (550) may cover the rim of the holder (540) to protect the rim of the holder (540).

[0102] According to one embodiment, the second rim cover (550) may include a second rim opening (550a). A holder (540) may be placed in the holder opening (550a), and the second rim cover (550) may be bent toward the rear to cover a rear portion from the edge of the holder (540).

[0103] According to one embodiment, the second rim cover (550) may be connected to the first rim cover (530). That is, the second rim cover (550) may be positioned at the rear of the first rim cover (530).

[0104] According to one embodiment, the second rim cover (550) may be coupled to the cover supporter (520) to secure the holder (540) to the cover supporter (520). The second rim cover (550) may include a second rim boss (559) formed to receive a screw (S). For example, the second rim boss (559) may be formed to correspond to the holder boss (549) and may be formed to correspond to the supporter boss (529).

[0105] According to one embodiment, the door (500) may include a door hinge (560). The door hinge (560) may include a cabinet coupling part (566) provided to be coupled to a cabinet (50), and a holder coupling part (564) positioned in front of the cabinet coupling part (564) and supported by a holder (540) and a second rim cover (550).

[0106] According to one embodiment, the cabinet coupling portion (566) may be formed to extend along a portion of the circular perimeter. The holder coupling portion (564) may be coupled to the hinge axis of the cabinet coupling portion (566). That is, the holder coupling portion (564) may be formed to cover the hinge axis. The holder coupling portion (564) may be formed in the shape of a roughly rectangular parallelepiped.

[0107] According to one embodiment, the cabinet coupling portion (566) may be positioned at the rear of the second rim cover (550), and the holder coupling portion (564) may be positioned at the front of the second rim cover (550). For example, a portion of the second rim cover (550) may be positioned between the holder coupling portion (564) and the cabinet coupling portion (566).

[0108] According to one embodiment, the door (500) may include a rear cover (570) surrounded by a second rim cover (550). The rear cover (570) may include an opening approximately semicircular in shape. The opening (570a) of the rear cover (570) may be covered by a blocking member (580). That is, the rear cover (570) may be formed to surround the blocking member (580), and the rear cover (570) may be coupled to the blocking member (580).

[0109] According to one embodiment, the rear cover (570) may include a projection hole (578). The projection holes (578) may be provided in multiple numbers and arranged spaced apart from each other. The holder (540) may include a rear projection (548). The rear projection (548) has the shape of a projection and can be inserted into the projection hole (578). Thus, the rear cover (570) and the holder (540) can be coupled to each other.

[0110] According to one embodiment, when a screw (S) is inserted into the second rim boss (559) and passes through the holder boss (549) and the supporter boss (529), the configuration of the front cover (510), cover supporter (520), first rim cover (530), holder (540), second rim cover (550), door hinge (560), rear cover (570), and glass (580) can be combined.

[0111] According to one embodiment, at least some of the components included in the door (500) may be made of the flame-retardant plastic of FIGS. 1 to 3. For example, at least one of the holder (540), second rim cover (550), rear cover (570), and glass (580) forming the rear of the door (500) may be made of the flame-retardant plastic. However, not limited thereto, at least some of the front cover (510), cover supporter (520), first rim cover (530), and door hinge (560) included in the door (500) may be made of the flame-retardant plastic.

[0112] According to one embodiment, when the dryer (400) performs a drying process while the door (500) is closed, high-temperature air may come into contact with the rear of the door (500). Additionally, when the dryer (400) performs a drying process while the door (500) is closed, moisture evaporates from the wet laundry (items to be dried), and the rear of the door (400) may be exposed to high temperature and humidity.

[0113] According to one embodiment, since the door (500) included in the dryer (400) is made of the flame-retardant plastic, the spread of fire to the surroundings can be limited when a fire occurs in the dryer (400).

[0114] According to one embodiment, since the parts forming the rear of the door (500) (e.g., holder (540), rear cover (570), and glass (580)) are manufactured from the flame-retardant plastic, the occurrence of blooming under high temperature and high humidity conditions can be reduced while providing a flame-retardant function of a certain level or higher. As a result, the durability and aesthetic appearance of the door (500) included in the dryer (400) can be improved.

[0115] FIG. 7 is a perspective view of a hood device (700) according to one embodiment of the present disclosure.

[0116] Some of the configurations shown in FIG. 7 can be understood as a view of the parts included in the hood device (700).

[0117] The embodiment of FIG. 7 can be optionally combined with the embodiments of FIG. 1 to 3.

[0118] Referring to FIG. 7, the hood device (700) may be configured to inhale exhaust gases, smoke, or food odors generated from a heating device (e.g., oven, stove, cooktop, over the range) and discharge them to the outside. The hood device (700) may be configured independently of the heating device, or the hood device (700) may be configured integrally with the heating device to be implemented as a cooking appliance.

[0119] According to one embodiment, when the hood device (700) constitutes a cooking appliance together with a heating device, the hood device (700) may be positioned so as to be spaced upward from the heating device by a predetermined distance. For example, the hood device (700) may be positioned above the indoor storage cabinet, and the heating device may be positioned below the hood device (700) and the indoor storage cabinet. For example, the hood device (700) and the heating device may be positioned vertically, with the hood device (700) installed on the upper side and the heating device installed on the lower side. However, the installation method and installation location of the hood device (700) are not limited thereto, and may be installed in various ways depending on the size of the installation location, the characteristics of the location, and the purpose of the installation of the hood device (700).

[0120] According to one embodiment, the hood device (700) may include a case (710) having a front surface (711), a side surface (712), a bottom surface (713), and a top surface (714). The case (710) may include an intake port (715) disposed on the bottom surface (713) through which smoke, etc. generated from a heating device is sucked in.

[0121] According to one embodiment, the hood device (700) may include a main fan (720) that is positioned inside a case (710) and sucks in air through an intake port (715).

[0122] According to one embodiment, the case (710) may include a protrusion (716) that protrudes upward from the upper surface (714) to cover the main fan (720). However, it is not limited thereto, and the upper surface (714) may be extended upward at an angle with respect to the first direction (d1) so as not to include an additional protrusion (716).

[0123] According to one embodiment, the case (710) may include a passage (717) formed inside the case (710) and communicating with the main fan (720) from the intake port (715).

[0124] According to one embodiment, the Euro (717) may be provided as a space inside the case (710). However, it is not limited thereto and may be provided as an additional area separated from the inside of the case (710) by a configuration such as a duct, extending from the intake port (715) to the main fan (720) inside the case (710).

[0125] According to one embodiment, gas introduced through the intake port (715) can be introduced into the main fan (720) through the flow path (717) and flow out through the exhaust pipe (703) connected to the hood device (700).

[0126] According to one embodiment, the hood device (700) may include a blade (750) positioned in front of the front end (715a) of the suction port (715) in a second direction (d2) which is a front-rear direction, and protruding from the front of the case (711) toward the front of the case (710).

[0127] According to one embodiment, the hood device (700) may include an auxiliary fan (761) disposed inside a case (710) and an auxiliary fan portion (760) comprising a discharge port (762) disposed on the lower surface (713) of the case (710) so that air blown by the auxiliary fan (761) is discharged downwards from the case (710).

[0128] According to one embodiment, the auxiliary fan portion (760) may be arranged to form an air curtain facing downward of the case (710).

[0129] According to one embodiment, the components constituting the hood device (700) may be made of the flame-retardant plastic of FIGS. 1 to 3. For example, at least one of the case (710), main fan (720), blade (750), and auxiliary fan part (760) included in the hood device (700) may be made of the flame-retardant plastic. Additionally, the exhaust pipe (703) connected to the hood device may be made of the flame-retardant plastic.

[0130] According to one embodiment, when the hood device (700) inhales exhaust gas, smoke, or steam generated from food by a heating device, the hood device (700) may be exposed to high temperature and humidity. Since the components constituting the hood device (700) are manufactured from flame-retardant plastic, they can provide flame-retardant functionality above a certain level while reducing the occurrence of blooming under high temperature and high humidity conditions. As a result, the durability and aesthetic appearance of the hood device (700) can be improved.

[0131] FIG. 8 is a perspective view of a refrigerator (800) according to one embodiment of the present disclosure.

[0132] FIG. 9 is an exploded perspective view showing a substrate assembly (panel assembly) (850) included in a refrigerator (800) according to one embodiment of the present disclosure.

[0133] The embodiments of FIGS. 8 and 9 can be optionally combined with the embodiments of FIGS. 1 to 3.

[0134] Referring to FIGS. 8 and 9, the refrigerator (800) may include a main body (810) that forms the overall exterior. A substrate assembly (850) and / or a cover case (900) may be disposed on the upper surface of the main body (810). For example, a substrate assembly (850) and / or a cover case (900) may be disposed on the outer side (811a) of the upper surface of the main body (810). The main body (810) may include an outer surface (811) and an inner surface (812). The outer surface (811) may form the exterior of the refrigerator (800). The outer surface (811) may be formed in a roughly rectangular shape. The outer surface (811) may include an upper surface (811a), a side surface (811b), a rear surface, and a lower surface. A substrate assembly (850) and / or a cover case (900) may be disposed on the outer surface (811). For example, a cover case (900) may be provided on the outer surface (811a) of the upper wall of the external body to cover a substrate assembly (850). The upper surface (811a) of the main body (810) may be the outer surface (811a) of the upper wall of the external body. However, the placement or location of the cover case (900) and the substrate assembly (850) is not limited to the example described above and may be provided at various locations, such as the lower wall or the outer surface of the external body (811).

[0135] According to one embodiment, an inner chamber (812) may be provided inside the outer chamber (811). The inner chamber (812) may form a storage chamber (30). The inner chamber (812) may be formed in a roughly rectangular shape.

[0136] According to one embodiment, the storage room (830) may include a first storage room (831) and a second storage room (832). The first storage room (831) may be a refrigerator room (831), and the second storage room (832) may be a freezer room (832). The refrigerator room (831) may be provided above the freezer room (832). However, it is not limited thereto, and the refrigerator room (831) may be provided below the freezer room (832). The storage room (830) may form a space for storing food inside.

[0137] According to one embodiment, the storage room (830) may include a first storage room (831) and a second storage room (832). The first storage room (831) may be a refrigerator room (831), and the second storage room (832) may be a freezer room (832). The refrigerator room (831) may be provided above the freezer room (832). However, it is not limited thereto, and the refrigerator room (831) may be provided below the freezer room (832). Food may be stored in the storage room (830).

[0138] According to one embodiment, the refrigerator (800) may include a storage container (833) and a shelf (834). The storage container (833) and the shelf (834) may be placed within the storage room (830). Food may be placed on the shelf (834), and food may be stored in the storage container (833). The number or shape of the shelf (834) and the storage container (833) is not limited to the example shown in the drawing.

[0139] According to one embodiment, the refrigerator (800) may include a door (820). The door (820) may be rotatably coupled to the main body (810) to open and close the storage compartment (830). The door (820) may include a first door (821) for opening and closing the first storage compartment (831) and a second door (822) for opening and closing the second storage compartment (832). Although only two doors (820) are shown, they are not limited thereto and may be provided as four or one.

[0140] According to one embodiment, the refrigerator (800) may further include a door shelf (823). The door shelf (823) may be attached to the door (820). The door shelf (823) may be attached to the door (820) on the inside of the door (820). A storage space (823a) for storing food may be provided within the door shelf (823). The door shelf (823) may protrude into the inside of the storage room (830) when the door (820) closes the storage room (830).

[0141] According to one embodiment, the refrigerator (800) may further include a hinge (840) and a hinge mounting plate (860).

[0142] According to one embodiment, the hinge (840) can connect the door (820) to one side of the main body (810). The hinge (840) can allow the door (820) to rotate on the main body (810). The hinge (840) may include a hinge shaft (841) and a hinge connecting plate (842). A portion of the hinge shaft (841) may be inserted into the door. Additionally, a portion of the hinge shaft (841) may be inserted into the hinge connecting plate (842). The hinge connecting plate (842) may be connected to a hinge mounting plate (860). The hinge connecting plate (842) may be connected to the front surface of the hinge mounting plate (860) so that the hinge (840) is connected to the main body (810).

[0143] According to one embodiment, the hinge mounting plate (860) may allow the hinge (840) to be mounted to the main body (810). The hinge mounting plate (860) may be coupled to the main body (810). For example, the hinge mounting plate (860) may be coupled to the upper outer side (811a) of the main body (810). The hinge mounting plate (860) may be provided in multiple numbers. Thus, the hinge (840) and the door (820) may be coupled at one end along the d1 direction (or -d1 direction) of the main body (810). However, the number of hinge mounting plates (860) is not limited to that shown in the drawings.

[0144] According to one embodiment, the refrigerator (800) may include a guide plate (813) and a wire (814).

[0145] According to one embodiment, the guide plate (813) may be coupled to the outer surface (811a) of the upper wall of the outer portion (811). The guide plate (813) may include a wire hole (813a) for guiding a wire (814).

[0146] According to one embodiment, the wire (814) may penetrate the wire hole (813a) and / or the upper surface of the main body (810). For example, the wire (814) may penetrate the upper surface of the outer surface (811) and the inner surface (812). The wire (814) may be electrically connected to various devices (e.g., electrical components) provided inside the main body (810). For example, the wire (814) may be electrically connected to a printed circuit board (870) placed on the outer surface (811a) of the upper wall of the outer surface. The guide plate (813) may be placed on the rear side of the board assembly (850).

[0147] According to one embodiment, the wire (814) may be provided in multiple numbers. The multiple wires (814) may include a first wire (814a) and a second wire (814b). For example, the first wire (814a) may be electrically connected to a printed circuit board (870) to control a device inside the main body (810), and the second wire (814b) may be electrically connected to a printed circuit board (870) to supply power to a device inside the main body (810). However, the functions of the first wire (814a) and the second wire (814b) are not limited to the above-described examples.

[0148] According to one embodiment, the refrigerator (800) may further include a substrate assembly (850). The substrate assembly (850) may be disposed on the outer surface (811a) of the upper wall of the outer body. For example, the substrate assembly (850) may be disposed on the outer upper surface (811a) of the outer body. The substrate assembly (850) may accommodate a printed circuit board (870). For example, a printed circuit board (870) with an electrical component (871) mounted thereon may be disposed inside the substrate assembly (850). The substrate assembly (850) may be moved along the front-rear direction on the outer surface (811a) of the upper wall of the outer body (811).

[0149] According to one embodiment, the refrigerator (800) may further include a cover case (900). The cover case (900) may guide the movement or position of the substrate assembly (850) along the front-rear direction of the main body (810). For example, the substrate assembly (850) may be inserted into or withdrawn from the cover case (900) along the front-rear direction of the outer body (811). The cover case (900) may include an upper case (910) and a lower case (920).

[0150] According to one embodiment, the upper case (910) may be positioned to cover the lower case (920) from above. For example, the upper case (910) may be positioned to cover a guide plate (813) in which a wire hole (813a) is formed. Since the upper case (910) covers both the lower case (920) and the guide plate (813), the lower case (920), the substrate assembly (850), the wire (814), and the guide plate (813) may not be visible from the outside of the refrigerator (800). Thus, the aesthetic appeal of the refrigerator's exterior can be enhanced. However, it is also possible to omit the upper case (910).

[0151] According to one embodiment, the lower case (920) may be coupled to the outer surface (811a) of the upper wall of the outer case. The lower case (920) may accommodate a substrate assembly (850) inside it. The lower case (920) may be positioned below the upper case (910). For example, the lower case (920) may be positioned between the upper case (910) and the outer upper surface (811a) of the outer case along the d3 direction (e.g., the height direction or vertical direction of the refrigerator (800). The lower case (920) may be positioned on the front side of the wire hole (813a). The lower case (920) may be positioned behind the display (890). For example, the lower case (920) may be positioned between the display (90) and the wire hole (813a) along the d2 direction (e.g., the front-back direction of the refrigerator (800). The lower case (920) can be attached to the upper wall outer surface (811a) of the external (811).

[0152] According to one embodiment, the refrigerator (800) may further include a display (890). The display (890) may display the operating status of the refrigerator. For example, the display (90) may display the temperature inside the storage compartment, etc. However, the function of the display (890) is not limited to the above examples. The display (890) may cover the front of the cover case (900). Therefore, the cover case (900) and the substrate assembly (850) may not be exposed when viewed from the front side of the main body (810). However, the display (890) may be omitted. The display (890) may be coupled to the main body (810). For example, the display (90) may be coupled to a hinge mounting plate (860) to cover the front of the cover case (900) and the substrate assembly (850). The display (890) may include a display portion (891) and a coupling portion (892). The display portion (891) may display the operating status of the refrigerator, and the connecting portion (892) may be connected to the hinge mounting plate (860). The display portion (891) may be provided between the connecting portions (892). The connecting portions (892) may be provided on both sides of the display portion (891).

[0153] According to one embodiment, the parts constituting the refrigerator (800) may be composed of the flame-retardant plastic of FIGS. 1 to 3. For example, the upper case (910) and lower case (920) included in the main body (810) and cover case (900) may be composed of the flame-retardant plastic. For example, in addition, the exterior parts and interior parts constituting the refrigerator (800) may be composed of the flame-retardant plastic.

[0154] According to one embodiment, since the components constituting the refrigerator (800) are made of the flame-retardant plastic, when a fire occurs in the refrigerator (800), for example, when a fire occurs in the printed circuit board (870) or the machine room operating the refrigerator (800), the spread of the fire to the surroundings can be limited.

[0155] According to one embodiment, since the components constituting the refrigerator (800) are manufactured from the flame-retardant plastic, it is possible to provide a flame-retardant function of a certain level or higher while reducing the occurrence of blooming under high temperature and high humidity conditions. As a result, the durability of the refrigerator (800) can be improved and the aesthetics can be enhanced.

[0156] A flame-retardant plastic composition according to one embodiment of the present disclosure relates to a material applicable to the exterior and interior parts of home appliances.

[0157] The flame-retardant plastic composition of the present disclosure has a predetermined level of flame retardancy and can reduce the spread of fire when a fire occurs.

[0158] The flame-retardant plastic composition of the present disclosure is a material that is robust to high temperature and high humidity conditions and can reduce the occurrence of whitening (or blooming) phenomena.

[0159] The flame-retardant plastic composition of the present disclosure has a fluidity greater than a predetermined amount, so that when manufacturing large-sized parts included in home appliances by injection molding, it can be easily injection molded.

[0160] The flame-retardant plastic composition of the present disclosure can be produced at a low production cost, thereby improving production efficiency.

[0161] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0162] A flame-retardant plastic composition according to one embodiment of the present disclosure (e.g., the flame-retardant plastic composition of FIG. 1 to 3) may comprise a polypropylene (PP)-based resin, a phosphorus / nitrogen-based compound, an antihydrolysis agent, and talc. The phosphorus / nitrogen-based compound may comprise one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP).

[0163] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the phosphorus / nitrogen-based compound may be composed of 20 to 35 weight percent based on the total weight of the flame-retardant plastic composition.

[0164] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the polypropylene-based resin may be composed of 55 to 65 weight percent based on the total weight of the flame-retardant plastic composition.

[0165] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the polypropylene-based resin may include one or more of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer.

[0166] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the melt flow index (MFI) of the polypropylene-based resin may be 10 to 50 g / 10 min.

[0167] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the hydrolysis inhibitor may include one or more of a polycarbodiimide-based compound, an oxazoline-based compound, and an epoxy-based compound. The hydrolysis inhibitor may be composed of 1 to 5 weight percent based on the total weight of the flame-retardant plastic composition.

[0168] In a flame-retardant plastic composition according to one embodiment of the present disclosure, the particle diameter of the talc may be 1 to 20 μm (micrometer).

[0169] The Izod notch impact strength of a flame-retardant plastic composition according to one embodiment of the present disclosure may be 2.5 to 4.5 kgf·cm / cm.

[0170] The flexural modulus of a flame-retardant plastic composition according to one embodiment of the present disclosure is 18,000 to 27,000 kgf / cm 2 It could be.

[0171] 200 to 280 kgf / cm² of a flame-retardant plastic composition according to one embodiment of the present disclosure 2 It could be.

[0172] The melt flow index of a flame-retardant plastic composition according to one embodiment of the present disclosure may be 5 to 10 g / min.

[0173] The heat deflection temperature of a flame-retardant plastic composition according to one embodiment of the present disclosure may be 100 to 135°C.

[0174] In a method for manufacturing a flame-retardant plastic composition according to one embodiment of the present disclosure, the flame-retardant plastic composition may be manufactured by a mechanical shearing method in which the polypropylene (PP)-based resin, the phosphorus / nitrogen-based compound, the hydrolysis inhibitor, the talc, and additives are extruded by a twin-screw extruder. The flame-retardant plastic composition may be manufactured by extrusion at 180 to 230°C.

[0175] A dryer (400) according to one embodiment of the present disclosure may include a main body (410) having an inlet (412a) formed therein for introducing or receiving a material to be dried, a drum (420) rotatably disposed inside the main body (410), a door (500) hinged to one side of the main body to open and close the inlet (412a), and a heat pump configured to generate drying air supplied to the drum, comprising an evaporator, a compressor, a condenser, and an expansion valve. The door (500) may include a front cover (510) formed to correspond to the input opening (412a), a first rim cover (530) arranged to surround the edge of the front cover (510), a cover supporter (520) arranged at the rear of the front cover (510) and supporting the front cover (510), a holder (540) arranged at the rear of the cover supporter (520) and capable of being coupled to the cover supporter (520), a second rim cover (550) arranged at the rear of the first rim cover (530), and a rear cover (570) arranged to be surrounded by the second rim cover (550). One or more of the holder (540), the second rim cover (550), and the rear cover (570) may be made of a flame-retardant plastic material.

[0176] In a dryer (400) according to one embodiment of the present disclosure, the phosphorus / nitrogen-based compound may be composed of 20 to 35 weight percent relative to the total weight of the flame-retardant plastic composition.

[0177] In a dryer (400) according to one embodiment of the present disclosure, one or more of the front cover (510), the first rim cover (530), and the cover supporter (520) may be made of the flame-retardant plastic material.

[0178] In a dryer (400) according to one embodiment of the present disclosure, the polypropylene-based resin may be composed of 55 to 65 weight percent relative to the total weight of the flame-retardant plastic composition.

[0179] In a dryer (400) according to one embodiment of the present disclosure, the polypropylene-based resin may include one or more of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer.

[0180] In a dryer (400) according to one embodiment of the present disclosure, the melt flow index (MFI) of the polypropylene-based resin may be 10 to 50 g / 10 min.

[0181] In a dryer (400) according to one embodiment of the present disclosure, the hydrolysis inhibitor may include one or more of a polycarbodiimide-based compound, an oxazoline-based compound, and an epoxy-based compound. The hydrolysis inhibitor may be composed of 1 to 5 weight percent based on the total weight of the flame-retardant plastic composition.

[0182] In a dryer (400) according to one embodiment of the present disclosure, the particle diameter of the talc may be 1 to 20 μm (micrometer).

[0183] A hood device (700) according to one embodiment of the present disclosure may include a case (710) comprising a front (711), a side (712), and a bottom (713), and having an intake port (715) formed on the bottom (713); a main fan (720) disposed inside the case (710) and configured to draw in air through the intake port (715); a blade (750) disposed ahead of the intake port (715) and protruding from the front (711) of the case (710) toward the front of the case (710); an auxiliary fan (761) disposed inside the case (710); and an auxiliary fan portion (761) comprising an exhaust port (762) disposed on the bottom (713) of the case (710) so that air blown by the auxiliary fan is discharged toward the bottom of the case (710). One or more of the above case (710), the above main fan (720), the above blade (750), and the above auxiliary fan part (760) may be made of a flame-retardant plastic material. The flame-retardant plastic material may include a polypropylene (PP) resin containing one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP), a phosphorus / nitrogen compound, an antihydrolysis agent, and talc.

Claims

In a flame-retardant plastic composition, Polypropylene (PP) resin; Phosphorus / nitrogen compounds; Antihydrolysis agent; and Contains talc, The above phosphorus / nitrogen compound comprises one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP), a flame-retardant plastic composition. In paragraph 1, A flame-retardant plastic composition comprising 20 to 35 weight percent of the phosphorus / nitrogen-based compound based on the total weight of the flame-retardant plastic composition. In paragraph 1, The above-mentioned polypropylene resin is a flame-retardant plastic composition comprising 55 to 65 weight percent of the total weight of the flame-retardant plastic composition. In any one of paragraphs 1 through 3, The above-mentioned polypropylene-based resin is a flame-retardant plastic composition comprising one or more of a propylene homopolymer, an ethylene-propylene random copolymer, and an ethylene-propylene block copolymer. In any one of paragraphs 1 through 4, A flame-retardant plastic composition having a melt flow index (MFI) of 10 to 50 g / 10 min of the above polypropylene-based resin. In paragraph 1, The above-mentioned hydrolysis inhibitor may include one or more of polycarbodiimide-based compounds, oxazoline-based compounds, and epoxy-based compounds, and The above-mentioned hydrolysis inhibitor is composed of 1 to 5 weight percent based on the total weight of the flame-retardant plastic composition, in a flame-retardant plastic composition. In paragraph 1, A flame-retardant plastic composition having a particle diameter of talc of 1 to 20 μm (micrometer). In paragraph 1, A flame-retardant plastic composition having an Izod notch impact strength of 2.5 to 4.5 kgf·cm / cm. In paragraph 1, The flexural modulus of the above flame-retardant plastic composition is 18,000 to 27,000 kgf / cm 2 Phosphorus, flame-retardant plastic composition. In paragraph 1, The tensile strength of the above flame-retardant plastic composition is 200 to 280 kgf / cm² 2 Phosphorus, flame-retardant plastic composition. In paragraph 1, A flame-retardant plastic composition having a melt flow index of 5 to 10 g / min. In paragraph 1, A flame-retardant plastic composition having a heat deflection temperature of 100 to 135°C. In any one of paragraphs 1 through 12, The flame-retardant plastic composition is manufactured by a mechanical shearing method in which the polypropylene (PP) resin, the phosphorus / nitrogen compound, the hydrolysis inhibitor, the talc, and additives are extruded by a twin-screw extruder, and The flame-retardant plastic composition is a flame-retardant plastic composition manufactured by extrusion at 180 to 230°C. In the dryer (400), A main body (410) having an inlet (412a) formed therein for introducing or receiving a material to be dried; A drum (420) rotatably disposed inside the main body (410); A door (500) hinge-coupled to one side of the main body to open and close the input port (412a); and It includes a heat pump configured to generate dry air supplied to the drum, comprising an evaporator, a compressor, a condenser, and an expansion valve. The above door (500) is, A front cover (510) formed to correspond to the above-mentioned input port (412a); A first rim cover (530) positioned to surround the edge of the front cover (510); A cover supporter (520) positioned at the rear of the front cover (510) and supporting the front cover (510); A holder (540) positioned at the rear of the cover supporter (520) and positioned to be connectable to the cover supporter (520); A second rim cover (550) positioned at the rear of the first rim cover (530); and It includes a rear cover (570) positioned to be surrounded by the second rim cover (550), and One or more of the holder (540), the second rim cover (550), and the rear cover (570) are made of flame-retardant plastic material, and The flame-retardant plastic material comprises a phosphorus / nitrogen compound including one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP), a polypropylene (PP) resin, an antihydrolysis agent, and talc, in a dryer (400). In the hood device (700), A case (710) including a front surface (711), a side surface (712), and a bottom surface (713), and including an intake port (715) formed on the bottom surface (713); A main fan (720) positioned inside the above case (710) and configured to suck in air through the above intake port (715); A blade (750) positioned further forward than the front end of the suction port (715) and protruding from the front (711) of the case (710) toward the front of the case (710); and It includes an auxiliary fan portion (761) comprising an auxiliary fan (761) disposed inside the case (710) and a discharge port (762) disposed on the lower surface (713) of the case (710) so that air blown by the auxiliary fan is discharged downward from the case (710). One or more of the above case (710), the above main fan (720), the above blade (750), and the above auxiliary fan part (760) are made of flame-retardant plastic material, and The flame-retardant plastic material comprises a polypropylene (PP) resin containing one or more of piperazine pyrophosphate (PPAP) or melamine polyphosphate (MPP), a phosphorus / nitrogen compound, an antihydrolysis agent, and talc, in a hood device (700).

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