KR20220071659A - Wheel guard for vehicles - Google Patents

Abstract

A vehicle wheel guard of the present invention includes a sound absorption material formed of multiple layers of polyurethane foam having different levels of density, and upper and lower base materials placed in upper and lower parts of the sound absorption material, wherein the sound absorption material can have a structure in which second polyurethane foam different in density from first polyurethane foam is interposed between layers of the first polyurethane foam having the same density, or can have a structure in which layers of the first to third polyurethane foam having density becoming gradually lower while going upward are stacked. The vehicle wheel guard can also include the third polyurethane foam having the same density as the first polyurethane foam, provided in the second polyurethane foam. The first polyurethane foam has density higher than that of the second polyurethane foam, and the structure can be stacked at least once. Therefore, the present invention is capable of preventing noise and vibrations from being conveyed to the interior of a vehicle.

Description

Wheel guard for vehicles

The present invention relates to a wheel guard for a vehicle, and more particularly, to a wheel guard for a vehicle capable of reducing transmission of noise and vibration by using hybrid polyurethane foams having different densities as a sound absorbing material.

In general, when a vehicle is driven, foreign substances such as muddy water and gravel are attached to the wheels by the rotation of the wheels rolling on the road surface, and the foreign substances are separated from the wheels by the centrifugal force of the wheels. Foreign substances detached from the wheel cause damage to the vehicle body, such as corrosion, and, in particular, cause damage to surrounding vehicles and injuries to pedestrians.

In order to solve this problem, a wheel guard wrapped around a tire is installed. The wheel guard is installed on the vehicle body around the wheel of the vehicle to prevent damage to the vehicle body due to foreign substances, and is an exterior part of the vehicle for blocking or absorbing noise generated from the road surface and the tire and preventing it from being transmitted to the inside of the vehicle.

1 and 2 are views for explaining the conventional wheel guard (3).

1 and 2 , a wheel guard 3 capable of preventing scattering of foreign substances is installed on the body panel 2 around the wheel 1 of the vehicle.

The conventional wheel guard 3 is simply composed of a plastic panel to prevent scattering of foreign substances such as water or soil on the tire to prevent it from flowing into the body panel 2, but to reduce the noise generated from the road surface and the tire. The function to block or absorb it and prevent it from being transmitted to the inside of the vehicle was insufficient.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a wheel guard for a vehicle that can prevent transmission of noise and vibration using hybrid polyurethane foams having different densities as a sound absorbing material.

In addition, another object of the present invention is to provide a wheel guard for a vehicle capable of improving the sound absorption performance and reducing the weight.

Another object of the present invention is to provide a wheel for a vehicle capable of providing a comfortable indoor space while improving riding comfort by blocking noise transmitted through the wheel.

The wheel guard for a vehicle of the present invention for the purpose of solving the above problems is a sound absorbing material composed of a multi-layered polyurethane foam having different densities; And a second polyurethane foam having a density different from that of the first polyurethane foam is interposed between the first polyurethane foams having the same density as the sound-absorbing material, including upper and lower substrates disposed on and below the sound-absorbing material. It may have a structure or a structure in which the first to third polyurethane foams whose density decreases toward the upper side are laminated.

The vehicle wheel guard may further include a polyurethane foam having the same density as that of the first polyurethane foam, which is provided inside the second polyurethane foam.

The first polyurethane foam has a higher density than the second polyurethane foam, and the structure may be laminated one or more times.

The lower substrate is composed of a single substrate layer, and may be composed of a thermoplastic resin and a composite material thereof. The base layer is polypropylene, high-density polyethylene, low-density polyethylene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polystyrene, polycarbonate, polyethylene terephthalate, wood stock, resin felt, HES felt, glass fiber reinforced It can be selected from board, natural fiber reinforced board, and PET reinforced board.

The lower substrate may have a structure in which first and second lower substrates are stacked. The first lower substrate may include a nonwoven fabric, polyurethane, or polypropylene, and the second lower substrate may include a reinforcing film or glass fiber.

The upper substrate may have a structure in which first and second upper substrates are stacked. The first upper substrate may include a nonwoven fabric or polyurethane, and the second upper substrate may include a reinforcing film or glass fiber.

The upper substrate acts as a skin layer, and the skin layer may have a structure in which a flexible polyurethane foam and an outer skin layer are laminated.

The upper and lower substrates may act as a shock absorbing layer.

According to the present invention as described above, by manufacturing the wheel guards using hybrid polyurethane foams having different densities, it is possible to prevent noise and vibrations generated during driving of the vehicle from being transmitted to the inside of the vehicle.

In addition, by using the polyurethane foam as a sound-absorbing material, it is possible to improve the sound-absorbing ability and to reduce the weight. In addition, by blocking noise transmitted through the wheel, it is possible to improve riding comfort and provide a comfortable interior space.

1 and 2 are views for explaining a conventional wheel guard for a vehicle.
3A and 3B are views illustrating a cross-sectional configuration of a wheel guard for a vehicle according to an embodiment of the present invention.
4A and 4B are views illustrating a cross-sectional configuration of a wheel guard for a vehicle according to another embodiment of the present invention.
5A and 5B are views illustrating a cross-sectional structure of a wheel guard for a vehicle according to another embodiment of the present invention.
6A and 6B are views illustrating a cross-sectional structure of a wheel guard for a vehicle according to another embodiment of the present invention.

Since the present invention can have various changes and can have various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Terms such as top, bottom, top, bottom, or top, bottom, etc. are used to distinguish relative positions of components. For example, for convenience, when naming the upper part of the drawing as the upper part and the lower part of the drawing as the lower part, the upper part may be named lower without departing from the scope of the present invention, and the lower part may be named upper part. .

In the drawings, the size and volume of the components are exaggerated for clarity, and parts indicated by the same reference numerals throughout the specification mean the same components.

Hereinafter, a wheel guard for a vehicle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

With increasing interest and awareness of the environment, electrification of automobiles is becoming a major trend in the automobile industry, and vehicle drive systems such as hybrid electric vehicles (HEV), battery electric vehicles (BEV), and fuel cell vehicles (FCV) are being diversified. . Accordingly, various in-wheel motor systems are being actively developed as next-generation driving devices. However, noise and vibration generated during driving of the vehicle may be transmitted to the inside of the vehicle, causing discomfort to the driver. The present technology relates to a wheel guard for a vehicle capable of reducing noise and vibration generated from wheels when driving a vehicle. The wheel guard for a vehicle of the present invention can prevent noise and vibration from being transmitted to the inside of the vehicle by using polyurethane foam as a sound-absorbing material, thereby preventing the driver's discomfort in the vehicle, deterioration of product performance, and reduction of lifespan.

Figure 3a shows a cross-sectional structure of a wheel guard for a vehicle according to an embodiment of the present invention.

Referring to FIG. 3A , the wheel guard 300a for a vehicle according to an embodiment of the present invention includes a hybrid polyurethane foam. The polyurethane foam for the wheel guard 300a is a polyurethane foam manufactured by mixing a polyol raw material and an isocyanate raw material, and may include a hybrid polyurethane foam composed of polyurethane foams having different densities. For example, the wheel guard 300a may include one or more first polyurethane foams 310 and one or more second polyurethane foams 320 , and the first polyurethane foams 310 are disposed between the wheel guards 300a. 2 has a structure in which the polyurethane foam 320 is interposed.

The first polyurethane foam 310 and the second polyurethane foam 320 may include foams having different densities. The first polyurethane foam 310 may have a greater density than the second polyurethane foam 320 . For example, the density of the first polyurethane foam 310 may be 30 kg/m³ to 45 kg/m³, and the density of the second polyurethane foam 320 may be 6 kg/m³ to 10 kg/m³ have.

The first polyurethane foam 310 is formed by foaming a polyol and isocyanate mixed with a high-pressure foaming machine (not shown) into a mold, and the second polyurethane foam 320 is formed by a low-pressure foaming machine (not shown). The polyol and isocyanate mixed by using the foam can be formed by foaming on the first polyurethane foam 310 .

The polyol raw material for manufacturing the first polyurethane foam 310, which is a rigid polyurethane foam, includes a stock solution in which a polyol, a catalyst, a foam stabilizer, and other additives are mixed, and the polyol uses polyether and polyester polyol, and an initiator , can be used alone or in combination depending on the number of functional groups. Silicone foam stabilizers are used as foam stabilizers, and can be used to emulsify resin, disperse foaming gas, prevent cell breakage, stabilize cell membranes, and improve thermal insulation performance. The catalyst may be used to control the reaction rate and improve moldability. The isocyanate raw material may include polymeric MDI.

The polyol raw material for manufacturing the second polyurethane foam 320, which is a flexible polyurethane foam, includes polyester polyol, and a polyol having a molecular weight of 3000 to 7500 using glycerin as an initiator may be mainly used for the flexible foam. A catalyst is a substance that promotes a chemical reaction in the presence of a trace amount without directly participating in the reaction, and may play a role in controlling the reaction rate of reactants (resinification reaction/foaming reaction). The foam reacts with isocyanate during the urethane reaction to form bubbles and swells the foam, and H ₂ 0 may be mainly used. As other additives, fillers and pigments may be added.

In FIG. 3A, a single structure in which one second polyurethane foam 320 having a relatively low density is interposed between the first polyurethane foams 310 having a relatively high density is shown. It may be laminated in stages. At this time, the uppermost polyurethane foam may be composed of a polyurethane foam having a low density.

The wheel guard 300a for a vehicle according to an embodiment of the present invention forms a first polyurethane foam 310 made of a rigid polyurethane having high density and high strength in the lower layer and the upper layer, and the first polyurethane foam ( By forming the second polyurethane foam 320 made of flexible polyurethane with elasticity between the 310), the wheel guard 300a for a vehicle can be formed without a separate exterior material.

Figure 3b shows another cross-sectional configuration of a wheel guard for a vehicle according to an embodiment of the present invention.

Referring to FIG. 3b , the wheel guard 300b for a vehicle according to an embodiment of the present invention includes a hybrid polyurethane foam. The polyurethane foam for the wheel guard 300b is a polyurethane foam manufactured by mixing a polyol raw material and an isocyanate raw material, and may include a hybrid polyurethane foam composed of a multi-layered polyurethane foam having different densities.

For example, the multi-layered polyurethane foam constituting the wheel guard 300b may be composed of the three-layered polyurethane foam 350 , 360 , and 370 . It can be sequentially laminated from the polyurethane foam with the highest density to the polyurethane foam with the lowest density. A first polyurethane foam 350 having the highest relative density is formed in the lowermost layer, and a second polyurethane foam 360 having an intermediate level of density is formed on the first polyurethane foam 350, and the second polyurethane foam 360 is formed on the first polyurethane foam 350. A third polyurethane foam 370 having the lowest density may be formed on the second polyurethane foam 360 .

For example, the first polyurethane foam 350 is formed into a mold by foaming a polyol and isocyanate mixed with a high-pressure foaming machine (not shown), and the second polyurethane foam 360 is formed by a medium-pressure foaming machine. (not shown) is formed by foaming the polyol and isocyanate mixed with the first polyurethane foam 350, and the third polyurethane foam 370 is mixed using a low pressure foaming machine (not shown) It can be formed by foaming the polyol and the isocyanate on the second polyurethane foam 350 .

In FIG. 3B, the wheel guard 300b for a vehicle exemplifies a single structure in which three layers of polyurethane foams 350, 360, and 370 are laminated, but such a laminated structure may have a multi-layered single laminated structure. For example, a wheel guard may be manufactured by repeatedly laminating the thin-film first to third polyurethane foams 350 , 360 , 370 a plurality of times. At this time, the polyurethane foam of the uppermost layer is preferably composed of a polyurethane foam having the lowest density.

Figure 4a shows a cross-sectional structure of a wheel guard (400a) for a vehicle according to another embodiment of the present invention.

Referring to Figure 4a, the wheel guard 400a for a vehicle according to another embodiment of the present invention, like the wheel guard 300a of an embodiment, a first polyurethane foam 410 having a relatively high density as an upper layer and It is formed as a lower layer, and has a hybrid polyurethane foam structure in which a second polyurethane foam 420 having a relatively low density is interposed between the first polyurethane foams 410 .

Multifaceted, unlike the wheel guard 300a of one embodiment, a plurality of spheres having a diameter smaller than that of the second polyurethane foam 420 inside the second polyurethane foam 420 having a relatively low density of the third polyurethane foam 430 may have a structure in which they are spaced apart from each other and arranged regularly or randomly. The third polyurethane foam 430 may have the same hardness and density as the first polyurethane foam 410 .

In the vehicle wheel guard 400a, the first polyurethane foam 410 provided in the upper layer and the lower layer may function as an exterior material with rigid polyurethane, and between the first polyurethane foam 410 The interposed second polyurethane foam 420 may provide elasticity and heat insulation to the flexible polyurethane. In addition, a plurality of third polyurethane foams 430 in the form of fine particles arranged to be spaced apart from each other in a substantially spherical shape may be provided inside the second polyurethane foam 420 . At this time, the third polyurethane foam 430 serves as a filler for reinforcing the mechanical properties of the second polyurethane foam 420 , and does not affect the elasticity of the second polyurethane foam 420 . Within the range, it may be provided in the second polyurethane foam 420 .

In the wheel guard 400a for automobiles as shown in Fig. 4a, the first polyurethane foam 410 having a high density is provided in the upper layer and the lower layer to protect the second polyurethane foam 420 interposed therebetween. At the same time, a third polyurethane foam 430 having the same high density as the first polyurethane foam 410 is provided inside the second polyurethane foam 420 having a low density and acts as a filler, thereby hybrid polyurethane. It is possible to improve the physical strength of the foam (400a).

Figure 4b shows another cross-sectional configuration of the wheel guard (400b) for a vehicle according to another embodiment of the present invention.

Referring to FIG. 4B , the wheel guard 400b for a vehicle according to another embodiment of the present invention includes a hybrid polyurethane foam. The polyurethane foam for the wheel guard 400b is a polyurethane foam manufactured by mixing a polyol raw material and an isocyanate raw material, and may include a hybrid polyurethane foam composed of a multi-layered polyurethane foam having different densities.

Like the wheel guard 300b for a vehicle according to an embodiment, the multi-layered polyurethane foam constituting the wheel guard 400b is composed of three-layered polyurethane foams 450, 460, and 470, and has the highest density. It can be laminated in order from the larger polyurethane foam to the lower density polyurethane foam. A first polyurethane foam 450 having the highest relative density is formed in the lowermost layer, and a second polyurethane foam 460 having an intermediate level of density is formed on the first polyurethane foam 450, the A third polyurethane foam 470 having the lowest density may be formed on the second polyurethane foam 460 .

For example, the first polyurethane foam 450 is formed by foaming a polyol and isocyanate mixed with a high-pressure foaming machine (not shown) into a mold, and the second polyurethane foam 460 is formed by a medium-pressure foaming machine. (not shown) is formed by foaming the polyol and isocyanate mixed with the first polyurethane foam 450, and the third polyurethane foam 470 is mixed using a low pressure foaming machine (not shown) It can be formed by foaming the polyol and isocyanate on the second polyurethane foam 460 .

Multi-faceted, unlike the wheel guard (400a) of other embodiments, the second polyurethane foam (460) in the interior of the second polyurethane foam (460) having a relatively lower density than the first polyurethane foam (450) A plurality of spherical fourth polyurethane foams 480 having a small diameter are spaced apart from each other, and may have a structure in which they are arranged regularly or randomly. The fourth polyurethane foam 480 may have the same hardness and density as the first polyurethane foam 450 .

In the vehicle wheel guard 400b, the first polyurethane foam 450 provided in the lower layer may function as an exterior material with rigid polyurethane, and the first and third polyurethane foams 450 and 470 ) The second polyurethane foam 460 interposed between the flexible polyurethane may give the function of elasticity and heat insulation. In addition, a plurality of fourth polyurethane foams 480 in the form of particles arranged in a substantially spherical shape and spaced apart from each other may be provided in the second polyurethane foam 460 . At this time, the fourth polyurethane foam 480 serves as a filler for reinforcing the mechanical properties of the second polyurethane foam 460 , and does not affect the elasticity of the second polyurethane foam 460 . Within the range, it may be provided in the second polyurethane foam 460 .

In Figure 4b, the wheel guard (400b) for automobile has been illustrated as having a single structure in which three layers of polyurethane foams 450, 460, and 470 are laminated, but such a laminated structure may have a laminated structure in multiple stages. For example, the wheel guard may be manufactured by repeatedly laminating the thin-film first to third polyurethane foams 450 , 460 , and 470 a plurality of times. At this time, the polyurethane foam of the uppermost layer is preferably composed of a polyurethane foam having the lowest density.

Figure 5a shows a cross-sectional structure of a wheel guard (500a) for a vehicle according to another embodiment of the present invention.

Referring to FIG. 5A , the vehicle wheel guard 500a according to another embodiment is a hybrid having different densities as a sound absorbing material 501, similarly to the vehicle wheel guards 300a and 400a shown in FIGS. 3A and 4A . It is composed of polyurethane foams 510 and 520, and has a structure in which a second polyurethane foam 520 having a relatively low density is interposed between the first polyurethane foams 510 having a relatively high density. The wheel guard 500a for a vehicle according to another embodiment may further include an upper substrate 545 and a lower substrate 540 disposed on and below the sound absorbing material 501 .

For example, the lower substrate 540 may be disposed under the lower layer 510 of the sound absorbing material 501 and may include a first lower substrate 541 and a second lower substrate 542 that are sequentially stacked. The first lower substrate 541 serves as a rigid impact prevention layer and may include polypropylene fibers. The second lower substrate 542 is disposed between the first lower substrate 541 and the first polyurethane foam 510, serves as a bumper and a shock absorbing layer, and includes low-melting-point modified polyester fibers and high-elasticity polyester fibers. may include

The upper substrate 545 is disposed on the upper layer 510 of the sound absorbing material 501 , and may include a first upper substrate 546 and a second upper substrate 547 that are sequentially stacked. The first upper substrate 546 may serve as a rubber powder layer disposed on the upper layer 510 . The second upper substrate 547 is disposed on the first upper substrate 546 to serve as a damping impact absorbing layer, and may include at least one of POE, TPE, TPU, SBC, and SEBS.

As another example, the lower substrate 540 includes a first lower substrate 541 and a second lower substrate 542 that are sequentially stacked under the lower layer 510 of the sound absorbing material 501, and the first lower substrate ( 541) may include a nonwoven fabric or polyurethane, and the second lower substrate 542 may include a reinforcing film or glass fiber having excellent impact resistance. The upper substrate 545 is composed of a first upper substrate 546 and a second upper substrate 547 that are sequentially stacked on the upper layer 510 of the sound absorbing material 501, wherein the first upper substrate 546 is A reinforcing film or glass fiber having excellent impact resistance may be included, and the second upper substrate 547 may include a nonwoven fabric or polyurethane.

As another example, the lower substrate 540 may be composed of a single substrate layer instead of a stacked structure. The base layer 540 may be made of a thermoplastic resin or a composite material thereof, and may include polypropylene, high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer. (ABS), polystyrene (PS), polycarbonate (PC), polyethylene terephthalate (PET), wood stock, resin felt, HS felt, glass fiber reinforced board, natural fiber reinforced board, or It can be selected from PET reinforced boards.

The upper substrate 545 includes a first upper substrate 546 and a second upper substrate 547 that are sequentially stacked on the upper layer 510 of the sound absorbing material 501 serving as an outer skin layer, and the first upper substrate Reference numeral 546 includes a flexible polyurethane foam serving as a heat insulating material, and the second upper substrate 547 may function as an outer skin layer.

Figure 5b shows another cross-sectional structure of a wheel guard (500b) for a vehicle according to another embodiment of the present invention.

Referring to FIG. 5B , the vehicle wheel guard 500b according to another embodiment is a hybrid having different densities as a sound absorbing material 505, like the vehicle wheel guards 300b and 400b shown in FIGS. 3b and 4b. Consisting of polyurethane foams 550 and 560, the first polyurethane foam 550 inside the second polyurethane foam 560 having a low density interposed between the first polyurethane foams 550 having a high density. ) has a structure in which a plurality of spherical third polyurethane foams 570 having the same density are arranged. The wheel guard 500b for a vehicle according to another embodiment may further include an upper substrate 585 and a lower substrate 580 disposed on and below the sound absorbing material 505 . The structures and materials constituting the upper and lower substrates 585 and 580 may be the same as the structures and materials described with reference to FIG. 5A .

Figure 6a shows a cross-sectional structure of a wheel guard (600a) for a vehicle according to another embodiment of the present invention.

Referring to FIG. 6A , the wheel guard 600a for a vehicle according to another embodiment is sequentially having different densities as a sound absorbing material 601 like the wheel guards 300a and 400a for a vehicle shown in FIGS. 3A and 4A . Consisting of a plurality of laminated hybrid polyurethane foams (610, 620, 630), the first polyurethane foam 610 having the highest density, the second polyurethane foam 620 having the density of the middle level, the lowest The third polyurethane foam 630 having a density has a sequentially stacked structure. In addition, the wheel guard 600a for a vehicle according to another embodiment has the lower and upper portions of the first polyurethane foam 610 and the third polyurethane foam 630 constituting the lower and upper layers of the sound absorbing material 601 . It may further include a lower substrate 640 and an upper substrate 645 disposed on the. The structures and materials constituting the upper and lower substrates 645 and 640 may be the same as the structures and materials described with reference to FIG. 5A .

Figure 6b shows another cross-sectional structure of the wheel guard (600b) for a vehicle according to another embodiment of the present invention.

Referring to FIG. 6b , the wheel guard 600b for a vehicle according to another embodiment is sequentially having different densities as a sound absorbing material 605 , like the wheel guards 300b and 400b for a vehicle shown in FIGS. 3b and 4b . Consisting of a plurality of laminated hybrid polyurethane foams 650, 660, 670, the first polyurethane foam 650 having the highest density, the second polyurethane foam 660 having the density of the middle level, the lowest The third polyurethane foam 670 having a density has a sequentially stacked structure. In addition, a plurality of spherical fourth polyurethane foams 680 having the same density as the first polyurethane foam 650 are arranged inside the second polyurethane foam 660 having an intermediate level of density.

The wheel guard 600b for a vehicle according to another embodiment is disposed on the lower and upper portions of the first polyurethane foam 650 and the third polyurethane foam 670 constituting the lower and upper layers of the sound absorbing material 601 . A lower substrate 690 and an upper substrate 695 may be further included. The structures and materials constituting the upper and lower substrates 695 and 690 may be the same as the structures and materials described with reference to FIG. 5A .

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

300a, 300b, 400a, 400b, 500a, 500b, 600a, 600b: wheel guard
310, 350, 410, 450, 510, 550, 610, 650: first polyurethane foam
320, 360, 420, 460, 520, 560, 620, 660: second polyurethane foam
330, 370, 430, 470, 530, 570, 630, 670: third polyurethane foam
480, 680: fourth polyurethane foam
501, 505, 601, 605: sound absorbing material
540, 541, 542, 580, 581, 582, 640, 641, 642, 690, 691, 692: lower substrate
545, 546, 547, 585, 586, 587, 645, 646, 647, 695, 696, 697: top substrate

Claims (14)

Sound absorbing material composed of a multi-layer polyurethane foam having different densities; and
Including upper and lower substrates disposed on and below the sound absorbing material,
The sound absorbing material has a structure in which a second polyurethane foam having a density different from the first polyurethane foam is interposed between the first polyurethane foams having the same density, or first to first to third ones whose density decreases toward the upper side 3 Wheel guard for automobile, characterized in that it has a structure in which polyurethane foam is laminated.
The method according to claim 1,
Wheel guard for automobiles, characterized in that it further comprises a polyurethane foam having the same density as that of the first polyurethane foam, which is provided inside the second polyurethane foam.
The method according to claim 1,
The wheel guard for automobiles, characterized in that the first polyurethane foam has a higher density than the second polyurethane foam.
4. The method according to claim 3,
A wheel guard for a vehicle, characterized in that the structure is laminated one or more times.
The method according to claim 1,
The lower substrate is a wheel guard for a vehicle, characterized in that composed of a single substrate layer.
6. The method of claim 5,
The base layer is a wheel guard for a vehicle, characterized in that composed of a thermoplastic resin and a composite material thereof.
7. The method of claim 6,
The base layer is polypropylene, high-density polyethylene, low-density polyethylene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polystyrene, polycarbonate, polyethylene terephthalate, wood stock, resin felt, HES felt, glass fiber reinforced A wheel guard for a vehicle, characterized in that it is selected from a board, a natural fiber reinforced board, and a PET reinforced board.
The method according to claim 1,
The lower substrate is a wheel guard for a vehicle, characterized in that it has a structure in which the first and second lower substrates are laminated.
9. The method of claim 8,
The first lower substrate includes a nonwoven fabric, polyurethane, or polypropylene, and the second lower substrate includes a reinforcing film or glass fiber.
The method according to claim 1,
The upper substrate is a wheel guard for a vehicle, characterized in that it has a structure in which the first and second upper substrates are laminated.
11. The method of claim 10,
The first upper substrate includes a nonwoven fabric or polyurethane, and the second upper substrate includes a reinforcing film or glass fiber.
2. The method of claim 1,
The upper substrate is a wheel guard for a vehicle, characterized in that it acts as a skin layer.
13. The method of claim 12,
The skin layer is a wheel guard for automobiles, characterized in that it has a structure in which a flexible polyurethane foam and an outer skin layer are laminated.
The method according to claim 1,
The upper and lower substrates are wheel guards for automobiles, characterized in that they act as shock-absorbing layers.

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