KR101846986B1 - Fiber engine cover and its manufacturing method - Google Patents

Abstract

The present invention relates to an engine cover using an artificial fiber or a natural fiber, and a production method thereof. To this end, the production method comprises the following steps: (S1) molding a frame (2) in a form of the engine cover (1) by inserting the fiber into a mold and then heating the same; and a foaming step (S2) for putting the frame (2) molded in the previous step (S1) into a foaming mold (5) filled with a foaming solution (4), heating the foaming mold (5), and allowing the heated foaming solution (4) to be attached onto a surface of the frame (2) while the foaming solution (4) is foamed in a form of a foaming material (3).

Description

TECHNICAL FIELD [0001] The present invention relates to an engine cover and a manufacturing method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cover using artificial or natural fibers, and a method of manufacturing the engine cover. Specifically, a lightweight fiber is inserted into a molding die, The molded frame is put into a foaming mold and the outer surface of the molded frame is wrapped with a foaming material so that the noise generated by the engine is effectively blocked or absorbed while the weight of the engine cover material is reduced compared with the conventional engine cover material, The present invention also relates to a method of manufacturing an engine cover using the same, and a method of manufacturing the engine cover.

In order to reduce the noise generated by the engine, the engine cover is covered and absorbed by the engine to provide a feeling of psychological stability to the occupant, thereby reducing fatigue caused by driving. The engine cover should be able to withstand the high temperature and vibration generated by the engine as well as the noise in the mounted state, so it must have sufficient rigidity and heat resistance. In addition, the engine cover is the area that is most impressive when it is opened to the car's bonnet, so it is strongly impressed by the eyes. Therefore, it is necessary to design that the engine room is smoothly arranged, .

For this reason, the engine cover for automobiles has excellent durability against high temperatures and repeated vibrations. It has excellent durability against chemical attack from various chemicals used in the engine room, such as engine oil, fuel, antifreeze, washer fluid, Materials with chemical properties are being applied, and in recent years, polyamide resins (nylon resins) have been generally applied. Polyamide was developed by DuPont in the United States and its brand name is Nylon. In Korea and Japan, the brand name nylon is more commonly used.

Polyamide has excellent impact resistance, abrasion resistance, and chemical resistance and is widely used for structural materials such as housings for electric and electronic devices, electric circuit boards, motor insulators, connectors, automobile engine covers, radiator housings and the like. These polyamides are classified into polyamide 6, polyamide 66 and polyamide 12 according to the manufacturing process. Polyamide 6 and polyamide 66 are mainly used for automobile engine parts. Polyamide 66 is more preferable than polyamide 6 And heat resistance.

Conventional engine covers are mainly made of lightweight polyamide 66 with a specific gravity of 1.14. However, when used in actual production, glass fiber or fiber glass with high specific gravity and materials other than talc And the specific gravity is much higher than that of the polyamide 66.

A conventional polyamide resin used as an automotive material, particularly an engine cover, is a polyamide hybrid resin composition for an engine cover of Patent Registration No. 10-0828654 (published on May 05, 2008). It contains 38.0 to 84.98% by weight of a polyamide resin, 5.0 to 20.0% by weight of glass fibers on glass, 5.0 to 20.0% by weight of inorganic filler, 0.02 to 2.0% by weight of heat resistant agent and 5.0 to 20.0% by weight of glass bubble. In addition, a polyamide resin composition disclosed in Japanese Patent Laid-Open No. 10-2016-0083527 (published on Jul. 12, 2016) and a molded plastic article using the same, disclosed in JP 10-2003-0000746 (published on Jan. 11, 2003) , And a highly heat-resistant sound insulating material for automobiles of Japanese Patent Application Laid-Open No. 10-2015-0024966 (published on May 20, 2015).

As shown in FIG. 1, the engine cover of the automobile using the techniques described above is used in the form of a foamed urethane foam 200 attached to the inside of a frame 100 composed of an injection molding material containing a polyamide resin as a main component.

However, as described above, since the frame is mainly composed of polyamide 66, injection molding is performed by mixing various materials such as glass fibers having a high specific gravity for the purpose of improving heat resistance and preventing deformation, . If the engine cover is heavy, it is not only difficult to handle in the distribution process, but also when the engine cover is mounted in an automobile engine room, the fuel consumption of the automobile is lowered due to the weight of the engine cover.

KR Patent Registration No. 10-0828654 (2008.05.09. Announcement). KR Patent Publication No. 10-2016-0083527 (published on July 12, 2016). KR Patent Publication No. 10-2003-0000746 (published on Jan. 11, 2003). KR Patent Publication No. 10-2015-0024966 (published Oct. 20, 2015).

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a frame for a motor vehicle, The molded frame is put in a foaming mold and the outer surface is wrapped with a foaming material so that the weight of the engine cover is reduced compared to the conventional engine cover material and the engine cover And a method for producing the same.

Another object of the present invention is to provide an engine cover using a fiber that transfers a decorative pattern to a surface of a foamed mold and allows the transferred decorative pattern to be displayed on the surface of the engine cover as it is, And a manufacturing method thereof.

In order to accomplish the above object, there is provided a method of manufacturing an engine cover using fibers according to the present invention, comprising the steps of: (S1) forming fibers in the form of an engine cover by inserting fibers into a mold;

And a foaming step (S2) of putting the frame formed in the step S1 into a foam mold filled with the foamed liquid and heating the foamed mold to foam the heated foamed liquid in the form of a foamed material to be attached to the surface of the frame.

The decorative mold 5 is transferred to the surface of the cavity so that the decorative pattern is displayed on the surface of the engine cover after the foaming step S2.

Step S1 is a step of molding an assembling hole in the frame so that the mounting member 8 fixed to the vehicle body can be assembled;

(S1-1) assembling a bolt of the mounting member (8) into the assembly hole (2a) of the frame after the step (S1)

After completing the above step S1-1, the frame 2 having the mounting member 8 assembled therein is placed in the foam mold 5 filled with the foamed liquid 6 and heated to proceed the foaming step S2, Is attached to the outer surface of the frame 2 and the nut surface to which the mounting member is assembled.

The mold release agent 72a is sprayed onto the surface of the foam metal mold 5 before proceeding to step S2 and the in mold paint 72b is applied to the surface of the mold release agent 72a and dried, The foamed liquid 6 is filled in the cavity of the foamed metal mold and the foaming step S2 is performed to allow the surface of the foamed material 3 of the engine cover to be coated with the inmold paint.

A decorative plate 10 is detachably assembled to the cavity so as to decorate the surface of the foamed material of the engine cover.

In the present invention, the fibers constituting the frame (2) are pet felts, which are artificial fibers. The pet pellets are placed in a cavity of a molding die holding 150 to 250 캜 and molded for 0.5 to 3 minutes.

In the present invention, the fibers constituting the frame are hemp fibers or coconut fibers which are natural fibers impregnated with a resin, and the natural fibers are molded into a cavity of a molding die maintaining 150 to 250 캜 for molding for 0.5 to 3 minutes.

The density of the molded frame 2 is in the range of 0.15 to 0.8 g / cm3.

The present invention constructed as described above is not an injection molding method in which polyester fibers are produced, but a lightweight artificial or natural fiber having a low density is heated in a molding die to form a frame, and then the surface of the molded frame is heated in a foaming mold And it is advantageous in that the weight can be significantly reduced as compared with a conventional engine cover material. The use of such lightweight fibers improves the fuel economy of the vehicle than the conventional engine cover, and facilitates transportation and handling.

In addition, since both the polyester fiber and the foamed material used as the artificial fibers used in the present invention are used as a sound insulating material or a sound absorbing material, the noise generated in the engine can be effectively blocked or absorbed more than the conventional engine cover.

Further, since decorative patterns are transferred onto the surface of the foamed mold according to the present invention, the decorative patterns are displayed on the surface of the foamed material as they are, so that the surface of the engine cover can be decorated cleanly and precisely as compared with the conventional injection molded article, There are advantages to be able to.

Further, according to the present invention, whenever a change in the design of the engine cover is required, the decorative plate attached to the cavity of the foam metal can be replaced at any time to promptly decorate the surface of the foam material with a design desired by the consumer, There is an effect.

1 is a conceptual view of a conventional engine cover
2 is a cross-sectional view of the engine cover
3 is a view showing an engine cover manufacturing process in which a mounting member is assembled according to another embodiment of the present invention
4 is a view showing a step before a frame is inserted into a foaming mold of the present invention
FIG. 5 is a view showing that the foaming step is progressed by inserting the frame into the foaming mold of the present invention
6 is an enlarged cross-sectional view showing a state in which a release agent and an in-mold paint are applied to the inner surface of the foamed metal mold of the present invention
7 is a sectional view showing a mold equipped with a decorative plate according to the present invention
Figure 8 is a flow chart of one embodiment according to the present invention
Figure 9 is a flowchart of another embodiment according to the present invention

Hereinafter, a method of manufacturing an engine cover according to the present invention will be described in detail with reference to the accompanying drawings.

The engine cover (1) of the present invention is made of a lightweight fiber having a low density and is made to be lighter in weight, and is used to wrap the foam material (3) up to the outer side surface of the frame (2) .

More specifically, the engine cover 1 of the present invention comprises the steps of: (S1) shaping the frame 2 in the form of an engine cover 1 by placing the fibers in a molding die (not shown) and heating them;

The frame 2 formed in the step S1 is placed in a foam mold 5 filled with the foamed liquid 4 and the foamed mold 5 is heated so that the heated foamed liquid 4 is foamed in the form of a foamed material 3. [ (S2) to be attached to the surface of the frame (2). 2 is a view showing an engine cover 1 of the present invention manufactured through steps S1 and S2.

The fibers constituting the frame can be selectively used with artificial fibers or natural fibers.

Artificial fibers are known as polyester fibers and are referred to as PET felt. The polyester fiber is a synthetic fiber made from a polymer having an ester bond and has high strength, low water absorption, excellent chemical resistance, heat resistance, and particularly, a characteristic having a unique elasticity due to its young's modulus Which is widely used in the industrial field. In addition, the polyester fiber is made of a benzene nucleus which is slightly weaker than the nylon used in the conventional engine cover whose strength is made into an aliphatic structure leading to a chain of carbon bonds, but its hardness is not less than nylon, Stiffness is improved when it is made, and it is characterized by its unique elasticity, which is strong against impact and vibration. It is empirical that polyester has a good Young's modulus, which is made of polyester, which we can buy easily on the market, PET bottles that sell drinks or bottled water. It has ductility and strong characteristics, so it is not torn or broken easily, so it is very strong against shock and vibration.

In addition, natural fibers may be hemp fibers and coconut fibers, and these natural fibers may be impregnated with a resin so as to maintain a molded shape when molded at a high temperature in a molding die.

Hemp fiber is a kind of natural fiber, which is a fiber made by stripping flax, hemp, hemp (hemp) and jute. It has similar properties to cotton fiber, but its strength is particularly high. When wetted with water, the strength becomes even greater. It is mainly used for summer clothes, and flax is used as a dressing material. It is made of hemp and used as summer cloths and blankets, and jute is used for strings or other purposes. These hemp fibers are mainly used as flax fibers, which are used as summer fabrics because they are cool and easy to wash. Jute is the next most common name in natural plant fibers and is used to make sacks or ropes. The hemp fiber is better than the fiber, and is used to make matting, fishing nets, rope and mosquito nets. As described above, the engine cover of the present invention can be manufactured by using hemp fibers already used for industrial purposes.

Coconut fiber is a fiber obtained from the outer shell of coconut which is a fruit of coconut palm belonging to palm tree, and is also called coir. The coconut fiber is rough, vaginal, reddish brown, 12 ~ 24㎛ in diameter, and consists of cellulose (cellulose) and woody lignin (lignin), which is the main component of wood. The processed fibers are about 10-30 cm long and are light and brittle, but they are durable, stretchy and dry. These fibers are strong against friction and they are used widely for industrial purposes, such as making brushes, making cushions, or making yarns to make sling ropes and nets.

The present invention is to manufacture an engine cover (1) which is made of artificial fibers or natural fibers which are used for industrial purposes as described above, and which is made lightweight by lowering the density of these fibers, thereby reducing weight and having excellent sound and sound absorption functions. Since the present invention uses these fibers as the frame 2 after molding, it is a major feature that the engine cover 1 can be manufactured without injection molding.

Since the artificial fibers or natural fibers used in the present invention are formed by assembling a large number of thin yarns, the density can be controlled according to the amount of yarns used. That is, if the fibers are densely woven using a fine yarn, the mass per unit volume is increased and the density is increased. When the yarns are loosely woven using less yarn, the mass per unit volume is decreased and the density is lowered. Dense fibers have a dense arrangement of yarns and numerous voids between the yarns, which results in good sound and sound absorption effects, but is heavily characterized by high density. Low-density fibers have a looser arrangement of yarns, and air voids between these yarns are less loud and sound-absorbing than light densities, but are lightweight due to their lower density.

Considering the effect of sound absorption and sound absorption and weight depending on the density, the fibers applied to the present invention have a density in the range of 0.15 to 0.8 g / cm 3, which is smaller than the conventional polyamide 66. Particularly, the artificial fiber has a density of 0.15 to 0.8 g / cm 3 and a weight reduction of about 20% as compared with the conventional polyamide 66, based on a thread having a thickness of 14 μm.

The conventional polyamide 66 has a specific gravity of 1.14 and a specific gravity of 1.38, so that the polyamide 66 is slightly lighter. In the present invention, the artificial fiber pet felt has a density lower than that of the conventional engine cover using the polyamide 66 % To reduce the fuel consumption of the vehicle.

When the density of pet felt is less than 0.15 g / cm 3, the density is too low to weaken the strength, and the sound insulation and sound absorption functions of the engine cover are lowered. When the density is higher than 0.8 g / cm 3, The sound absorbing performance is lowered and the weight is rather heavy. Therefore, the object of the present invention of reducing the weight and effectively shielding the noise can not be realized.

In the case of natural fibers, the density is lowered within a range that the specific gravity is slightly higher than the conventional polyamide 66 but the strength is not weak, so that the weight of the engine cover is lower than that of the conventional engine cover using the polyamide 66 and the engine cover 1 excellent in sound insulation and sound absorption performance is manufactured . In the case of the conventional engine cover, since the polyamide 66 is melted at a high temperature and is manufactured by injection molding, voids are not generated therein, so that there is no sound absorbing function and the density can not be controlled and the weight is heavy. The present invention has been proposed in order to solve the disadvantages of the engine cover manufactured by the conventional injection molding.

In the step (S1) of molding the frame (2), the artificial fibers or the natural fibers impregnated with the resin are put into a molding die holding at 150 to 250 캜 and molded for 0.5 to 3 minutes. When the molding die is heated to the above-mentioned temperature, the pet felt, which is artificial fiber accommodated in the inner cavity, is not melted due to the high temperature of the molding die and is molded in the cavity shape of the molding die. And is taken out to the outside as it is molded, and the frame 2 is formed into a cavity shape. The cavity of the molding die is prepared in advance in the form of an engine cover of the present invention.

In addition, if the natural fiber impregnated with the resin is put into a molding die holding 150 to 250 캜 and molded for 0.5 to 3 minutes, the impregnated resin is melted or molded in a cavity shape of the molding die and cooled When the mold 2 is demolded, the mold 2 is directly taken out to the outside to mold the frame 2 into a cavity shape. Here, the above-mentioned resin is impregnated together in the production of natural fibers, and known ones are used.

The temperature of the molding die in the step S1 is very important. That is, if the frame 2 is molded at a temperature of 150 DEG C or lower, the molding process proceeds in a state in which the pet felt is low in temperature because the temperature is low, so that the molded state of the frame 2 can not be maintained There is a possibility of being deformed. More importantly, the object of the present invention can not be achieved by molding the frame 2 at a temperature of 250 DEG C or higher. The reason is that since the molding temperature is too high, the pet felt is completely melted and melted more than the state in which the pet felts are molded, so that the thin single yarns constituting the felt are formed into a single bundle so that voids do not occur inside. This is similar to injection molding, so that voids are not generated in the inside, and thus a sound absorbing effect can not be expected. Therefore, the temperature of the molding die is in the range of 150 to 250 DEG C, which is a molding temperature considering that the fiber density is 0.15 to 0.8 g / cm < 3 > The density and temperature are not critical figures that can be obtained through simple or repeated experiments.

4 to 5, the foam 2 is inserted into the cavity of the foam mold 5 filled with the foamed liquid 4, and the foamed mold 5, When the temperature of the foamed liquid 4 is raised by heating after closing the lower molds 51 and 52, the foamed liquid 4 is foamed on the entire outer surface of the frame 2 in the form of foamed material 3, As well as to the entire outer surface including the four sides. It will be appreciated that when the foam material 3 covers the entire surface of the frame 2, the sound insulation and the sound absorption effect are improved as compared with the conventional engine cover 100 in which the foam material 200 is attached only to the inner front surface.

A known foaming liquid for foaming is used as the foaming liquid (4). The urethane liquid for foaming is widely used at present, and since the foaming method thereof is a well-known technology, a detailed description thereof will be omitted.

In another embodiment of the present invention, an assembling hole 21 is formed in the frame 2 so that the mounting member 6 fixed to the vehicle body can be assembled when the step S1 is performed.

(S1-1) assembling a bolt of a mounting member (6) into an assembly hole (21) of the frame (2) by using a nut (7) after the step (S1)

After completing the step S1-1, the frame 2 in which the mounting member 6 is assembled is placed in the cavity of the foam mold 5 filled with the foamed liquid 4 and heated to proceed the foaming step S2, (3) is attached to the outer surface of the frame (2) and the surface of the nut (7) which assembles the mounting member (6) so that the nut (7) is not exposed.

The mounting member 6 is detachably assembled to a coupling protrusion (not shown) prepared in an engine room of an automobile so that the engine cover 1 of the present invention can be mounted on an automobile.

In the present invention, the mold release agent 8 is sprayed onto the surface of the foamed mold 5 before the step S2 is performed, the in mold paint 9 is coated on the surface of the release agent 8, The foaming liquid 4 is charged into the cavity of the foam mold 5 to which the in-mold paint 9 has been applied and the foaming step S2 is performed so that the surface of the foam material 3 of the engine cover 1, So that the paint (9) is protected in a coated state.

More specifically, when the engine cover 1 molded by opening the upper and lower molds 51 and 52 of the foam metal mold 5 is demolded from the foam metal mold 5, the in-mold paint 5 9 is sprayed onto the cavity of the foaming mold 5 by applying the liquid release agent 8 having a property of being well separated to the in-mold paint 9 while being applied to the foam metal mold 5 so as to smoothly escape . Since the releasing agent 8 is volatile and evaporates after a certain period of time, it is necessary to apply the releasing agent 8 every time it is evaporated. When the releasing agent 8 is applied as described above, the in mold paint 9 is applied to the surface of the releasing agent 8 and dried. The in-mold paint 9 escapes from the mold together with the engine cover 1 produced when the foaming step S2 is completed and the molded engine cover 1 is demolded, and the surface of the foamed material 3 is coated So as to protect the surface of the foam material 3. At this time, since the in-mold paint 9 is not adhered to the release agent 8 but is merely collapsed, it is easily separated from the release agent 8 when the engine cover 1 is demolded, so that it is demoulded integrally with the engine cover 1. Therefore, the final color of the surface of the engine cover 1 becomes the color of the in-mold paint 9, so that the surface of the engine cover 1 is decorated.

The decorative mold 10 of the present invention can be detachably assembled to the cavity so as to decorate the surface of the foamed material 3 of the engine cover 1. [ The decorative plate 10 is made of a metal material so as to withstand the temperature to be heated when the steps S1 and S2 are performed, do. The decorative plate 10 can have a plurality of different designs so that the surface design of the engine cover 1 can be variously decorated. If the decorative plate 10 is used, it can respond to the design change demand of the buyer immediately.

[Examples 1 to 3]

The frame 2 of the engine cover was molded from the molding die using the fibers of the present invention under the conditions shown in Table 1 below. That is, in the molded frame 2, the pet felt having the density of 0.15 g / cm3, 0.5 g / cm3 and 0.8 g / cm3 was used as the pet felt in Example 1, and the hemp fiber of Example 2 had a density of 0.2 g / , 0.5 g / cm 3 and 0.8 g / cm 3, respectively. The coconut fibers of Example 3 were used in a density of 0.2 g / cm 3, 0.5 g / cm 3 and 0.8 g / cm 3. The thickness of the molded frame 2 was made equal to 3 mm according to the conditions of each embodiment.

material Item Example 1 Example 2 Example 3 Petfelt
Density (g / cm3) 0.15 0.5 0.8 Molding Thickness (mm) 3 3 3 Hemp fiber
Density (g / cm3) 0.2 0.5 0.8 Molding Thickness (mm) 3 3 3 Coconut fiber
Density (g / cm3) 0.2 0.5 0.8 Molding Thickness (mm) 3 3 3

[Comparative Examples 1 and 2]

A frame was molded under conditions similar to those of the above example except that some conditions were changed as shown in Table 2 below. In other words, Comparative Examples 1 and 2 were formed by using fibers having a density different from that of Examples, and having the same thickness of 3 mm.

material Item Comparative Example 1 Comparative Example 2 Petfelt
Density (g / cm3) 0.07 1.5 Molding Thickness (mm) 3 3 Hemp fiber
Density (g / cm3) 0.07 2 Molding Thickness (mm) 3 3 Coconut fiber
Density (g / cm3) 0.07 3 Molding Thickness (mm) 3 3

[Experimental Example]

The tensile strength, weight and sound absorption ratio of the frames molded according to the conditions of the examples and comparative examples were measured. Table 3 shows the results of the physical experiment example of the embodiment, and Table 4 shows the physical experiment example results of the comparative example. The weights in Tables 3 and 4 are the weights of the specimens of each frame cut into 10 cm × 10 cm width × height.

Table 5 shows the result data of the sound absorption test example of the embodiment, and Table 6 shows the result data of the sound absorption test example of the comparative example. The experimental examples of Tables 5 and 6 are the sound absorption ratios measured by the reverberation method. The test environment is a temperature of 26 ° C and a humidity of 50% RH.

* Physical experiment example of the embodiment * Item Example 1 Example 2 Example 3
Petfelt Tensile strength (kg / cm 2) 25 32 38 Elongation (%) 27 34 40 Weight (g) 220 250 278
Hemp fiber Tensile strength (kg / cm 2) 22 29 33 Elongation (%) 25 31 36 Weight (g) 224 252 280
Coconut fiber Tensile strength (kg / cm 2) 21 26 30 Elongation (%) 24 30 35 Weight (g) 226 255 283

* Physical experiment example of comparative example * Item Comparative Example 1 Comparative Example 2
Petfelt Tensile strength (kg / cm 2) 17 41 Elongation (%) 20 45 Weight (g) 205 340
Hemp fiber Tensile strength (kg / cm 2) 15 35 Elongation (%) 18 22 Weight (g) 217 342
Coconut fiber Tensile strength (kg / cm 2) 14 34 Elongation (%) 18 23 Weight (g) 218 344

* Sound absorption test example of the embodiment * Example Frequency (Hz) 250 500 1,000 2,000 Absorption coefficient
(a _s ) Example 1 0.27 0.35 0.42 0.65 Example 2 0.32 0.47 0.53 0.66 Example 3 0.35 0.54 0.66 0.80

* Sound absorption test example of comparative example * Comparative Example Frequency (Hz) 250 500 1,000 2,000 Absorption coefficient
(a _s ) Comparative Example 1 0.2 0.28 0.34 0.39 Comparative Example 2 0.24 0.31 0.36 0.41

As can be seen from the above Examples and Experimental Examples, the frame (2) of the present invention was found to have a thickness of 3 mm, and as a result, the density of Example 3 having the highest density was the best in both physical properties and sound absorption performance . In the above-described embodiments, since the fibers having a low density in the range of 0.15 to 0.8 g / cm 3 are used, the weight of the embodiments is low and the sound absorption performance is good. Particularly, the weight of the third embodiment is larger than that of the conventional polyamide 66 engine- The sound absorption performance was even better with a reduction of about 20%.

However, since the density of the comparative example deviates from the range of the present invention, the sound absorption rate of the comparative example is lower than that of Examples.

1: Engine cover 2: Frame
3: foam material 4: foam liquid
5: Foam mold 6: Mounting member
7: Nut 8: Release mold
9: In-mold paint 10: Decorative plate

Claims (9)

(S1) molding the frame (2) in the form of an engine cover (1) by inserting the fiber into a mold and heating it;
The frame 2 formed in the step S1 is placed in a foam mold 5 filled with the foamed liquid 4 and the foamed mold 5 is heated so that the heated foamed liquid 4 is foamed in the form of a foamed material 3. [ (S2) to be attached to the surface of the frame (2)
The fibers constituting the frame (2) are natural fibers impregnated with petfell or resin, which are artificial fibers, and are molded into cavities of a mold for holding at 150 to 250 캜 for 0.5 to 3 minutes, Or coconut fiber;
And the density of the molded frame (2) is in the range of 0.15 to 0.8 g / cm < 3 >.
The engine cover (1) according to claim 1, characterized in that the decorative mold is transferred to the surface of the cavity (5), and a decorative pattern is displayed on the surface of the engine cover (1) after the foaming step (S2) Gt;
[2] The method of claim 1, wherein the step S1 includes: forming an assembly hole in the frame so that the mounting member fixed to the vehicle body can be assembled;
(S1-1) assembling a bolt of the mounting member (6) into the assembly hole (21) of the frame and screwing the bolt with the nut (7) after the step (S1)
After completing the step S1-1, the frame 2 having the mounting member 6 assembled therein is placed in the foam mold 5 filled with the foamed liquid 4 and heated to proceed to the foaming step S2, Is attached to the outer surface of the frame (2) and the surface of the nut (7) for assembling the mounting member (6).
delete delete delete delete delete 4. An engine cover using a fiber produced by the manufacturing method according to any one of claims 1 to 3.

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