KR102018644B1 - A multi-layered vehicle engine cover and method of manufacturing an engine cover - Google Patents

Abstract

The present invention is a vehicle having a versatile structure consisting of a skin layer (1), anti-twist layer (2) reinforcing sound absorption layer (3), a center layer (4), a reinforcing sound absorption layer (5), a distortion prevention layer (6) and a back layer (7). An engine cover and an engine cover manufacturing method.
The vehicle engine cover or the engine undercover of the present invention has a multifunctional structure in which the reinforcing sound absorbing layer 3 and the reinforcing sound absorbing layer 5 are bonded to the upper and lower surfaces of the center layer 4, thereby maintaining the strength of the center, thereby improving sound absorption and sound insulation. In addition, there is an advantage that can be obtained in a relatively light vehicle engine cover in a multi-layer structure.

Description

A multi-layered vehicle engine cover and method of manufacturing an engine cover}

The present invention relates to a vehicle engine cover and a method for manufacturing the engine cover, and more particularly, to a vehicle engine cover and a method for manufacturing the engine cover made of a material that absorbs vibration and noise of the vehicle well and heat resistance and light weight.

The engine cover and engine undercover of the vehicle are exterior materials mounted to the outside of the engine to protect the engine from the external environment and make the engine room look neat while the vehicle is running. It is a matter of course that the surface characteristics should be good, but a material having excellent sound absorption and sound insulation, light weight, and heat resistance along with mechanical properties resistant to external shocks is required.

As the material of the engine cover and the engine undercover, the injection molding was applied by applying glass fiber that imparts heat resistance to nylon or PET resin, and then fastened as a bolt with the upper part of the engine. There is a problem such as falling of the working environment, such as falling, and mounting a material injecting polyamide resin after forming a polyurethane foam layer on the engine side, but there was a problem that the weight of the material increases.

In the prior art relating to the material of the engine cover and the engine undercover, for example, Patent Document 1 discloses 38 to 84.98% by weight of polyamide resin, 5 to 20% by weight of glass fiber, 5 to 20% by weight of inorganic filler, heat resistance An engine cover extruded from a polyamide hybrid resin composition composed of 0.02 to 2% by weight and 5 to 20% by weight of a glass bubble is disclosed, but there is a problem in that the overall weight of the engine cover is increased since it is a synthetic resin molded article. Patent Document 2 discloses a sound absorbing material for an engine cover in which low-melting point PET fibers and regular PET fibers are carded and needle punched to form a first felt layer and a second felt layer, which are pressed and laminated. Patent document 3 preheats and cools a highly rigid material made of PP (polypropylene, 11a) and G / F (grass fiber, 11b), and is a microfiber sound absorbing and insulating material having excellent heat resistance under the G / F (11b). 15) After fixing the heat fusion, the foam boss 12 made of urethane rigid foam inserts the insulator lava 13 fixed to the engine to the lower side of the microfiber sound absorbing and insulating material 15, and molded the composite material 11 for automobile use. Disclosed is an integrated engine cover for implementing sound absorption and sound insulation, but the prior art is mainly related to sound insulation and sound insulation of an engine cover.

The present applicant has developed a material applied to the engine cover of a vehicle having a multi-layer structure and light weight, and improved strength, sound insulation and heat resistance, and completed the present invention.

Patent Document 1; Republic of Korea Patent Registration No. 10-0828654 Patent Document 2; Republic of Korea Patent Publication No. 10-1470478 Patent Document 3; Republic of Korea Patent Publication No. 10-1717622

The present invention relates to a method for manufacturing a vehicle engine cover and an engine cover of a multi-layered structure, and more particularly, to absorb vibration and noise of a vehicle, and to provide a material of a multi-layered engine cover and an engine undercover having excellent heat resistance and light weight. It is an object of the present invention to provide a method for manufacturing a vehicle engine cover and engine cover of a multi-layer structure manufactured by using.

As a solution for manufacturing a vehicle engine cover and an engine cover having a multi-layered structure, which is an object of the present invention, the skin layer (1), the anti-twist layer (2), the reinforced sound absorbing layer (3), the center layer (4), the reinforced sound absorbing layer (5) ), A multi-layer laminate (S) consisting of the anti-twist layer (6) and the back layer (7), the skin layer (1) is a high heat-resistant polyethylene terephthalate (PET) film, the anti-twist layer (2) and twist The prevention layer 6 is a span bond long fiber nonwoven fabric T1, the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 are high strength needle short fiber nonwoven fabrics T2, and the center layer 4 is a high strength needle end. It is a fibrous nonwoven fabric T3, and the back layer 7 is formed of urethane foam or formed of urethane foam on the outer surface of the highly heat resistant PET film.

The epidermal layer 1 according to the present invention is made of a high heat resistant polyethylene terephthalate (PET) film having a thickness of 30 ~ 300㎛ smooth surface, has a waterproof function, and exhibits a heat resistance temperature in the range of 150 ~ 200 ℃.

The span bond long fiber nonwoven fabric (T1) forming the anti-twist layer (2) and the anti-twist layer (6) according to the present invention is made by melt spinning the polyethylene terephthalate (PET) or polypropylene (PP) by the melt spun method It is a long-fiber nonwoven fabric produced by joining the web, the fineness of the fiber is 50 to 300 denier (denier), the weight is produced to have a range of 30 ~ 150g / ㎡.

Since the span bond nonwoven fabric has no difference in mechanical strength between the machine direction MD and the vertical direction CM, the warp prevention layer 2 and the warpage prevention layer 6 of the present invention made of the span bond nonwoven fabric T1. Has the function of suppressing distortion caused by heat generated by the engine.

The high strength needle short fiber nonwoven fabric (T2) forming the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 is a RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) 20 as a nonwoven fabric having a weight of 200 to 1500 g / m 2. ~ 50 parts by weight, polyethylene terephthalate (PET) is composed of 50 to 80 parts by weight of the fiber, 4 to 15 deniers (denier), non-woven fabric for web-bonding the web of 64 to 76㎜ length by carding, web formation and needle punching It is prepared according to the method.

The high strength needle short fiber nonwoven fabric (T3) forming the center layer 4 is 30 to 70 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), polyethylene terephthalate (PET) fiber 30 to 70 parts by weight It is prepared and manufactured according to the nonwoven fabric manufacturing method of web-bonding fineness of 4-15 denier (Denier), 64-76 mm in length by carding, web formation, and needle punching.

The reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 are 20 to 30 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), high strength composed of 70 to 80 parts by weight of polyethylene terephthalate (PET) fiber A needle short fiber nonwoven fabric (T2), the central layer 4 is composed of 30 to 50 parts by weight of RM fibers or LM fibers (Rapid Melting Fiber or Low Melting Fiber), 50 to 70 parts by weight of polyethylene terephthalate (PET) fibers Needle short fiber nonwoven fabric (T3).

The reinforcing sound absorbing layer 3 and the reinforcing sound absorbing layer 5 are formed at a relatively small ratio of RM fibers or LM fibers (Rapid Melting Fibers or Low Melting Fibers) compared to the center layer 4 to be laminated. The less the number of pores between the fibers to have a sound absorption function, the center layer (4) is the ratio of the RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) reinforcing sound absorption layer (3) and reinforcing sound absorption layer ( Compared to 5), when the composition is laminated with a relatively large amount, there are many melt-bonded portions, so that the fibers are tightly bonded to improve strength and sound insulation, so that the center layer 4 is formed to have a structure having high strength with sound insulation at the center. It consists of

In addition, a multi-layer structure consisting of the skin layer 1, the anti-twist layer 2, the reinforcing sound absorption layer 3, the center layer 4, the reinforcing sound absorption layer 5, the anti-twist layer 6, and the back layer 7 according to the present invention. Method for manufacturing a vehicle engine cover of a). High-strength needle short-fiber nonwoven fabric (T2) according to the first step, two spanbond long fiber nonwoven fabrics (T1) according to the anti-twist layer (2) and the anti-twist layer (6), the reinforcing sound absorption layer (3) and the reinforcing sound absorption layer (5) 2) preparing two sheets of high strength needle short fiber nonwoven fabric (T3) according to the center layer (4) and preparing them in separate processes, b). In the second step, a lamination agent (a) obtained by laminating the high strength needle short fiber nonwoven fabric (T2), which is the reinforcing sound absorption layer (3), and the span bond long fiber nonwoven fabric (T1), which is the anti-twist layer (2), was prepared and reinforced in the same manner. Manufacturing a laminate (b) in which a high strength needle short fiber nonwoven fabric (T2), which is a sound absorbing layer (5), is laminated with a span bond long fiber nonwoven fabric (T1), a twist prevention layer (6), and c). Bonding the laminate (a) and the laminate (b) prepared in the second step to the upper and lower surfaces of the high strength needle short fiber nonwoven fabric (T3) as the center layer (4) in a third step, d). In the fourth step, the heat-resistant polyethylene terephthalate (PET) film of the back layer 7 is fused to the surface of the laminate b bonded to the bottom surface of the center layer 4 by flame heating, and the back layer 7 Forming a urethane foam on the highly heat-resistant polyethylene terephthalate (PET) film, e) flame heating with the anti-twist layer 6 which is the surface of the laminate (a) bonded to the upper surface of the central layer 4 in a fifth process And fusion bonding the high heat-resistant polyethylene terephthalate (PET) film of the skin layer 1 by bonding the skin layer 1 which is a film.

The vehicle engine cover or the engine underker of the multi-layered structure of the present invention has an effect of improving the mechanical strength and the sound absorbing and insulating property of the engine cover by stacking a reinforcing sound absorbing layer above and below the center layer.

In addition, the skin layer and the back layer are formed of a high heat resistant film to satisfy the mechanical strength, sound absorbing and sound resistance and heat resistance required by the engine cover, and have a multi-layer structure and a relatively light advantage.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing a cross section of an embodiment in which the skin layer is a film layer and the back layer has a film and urethane foam in the engine cover or the engine undercover of the present invention.
FIG. 2 is a view schematically showing a cross section of an embodiment in which the skin layer is a film layer and the back layer is urethane foam in the engine cover or the engine undercover of the present invention.
3 is a real picture of the engine cover manufactured by an embodiment of the present invention.
4 is a real picture of the engine undercover manufactured by the embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples and Test Examples, and the present invention is not limited by the following description.

1 and 2 are cross-sectional views of a multi-vehicle vehicle engine cover or an engine undercover of the present invention. Referring to FIGS. 1 and 2, the structure of the multi-vehicle vehicle engine cover of the present invention will be described.

The vehicle engine cover of the multi-layered structure according to the present invention has a skin layer (1), a distortion prevention layer (2), a reinforcing sound absorption layer (3), a center layer (4), a reinforcing sound absorption layer (5), a distortion prevention layer (6) and a rear surface from above. Layer 7.

The skin layer 1 is a high heat resistance polyethylene terephthalate (PET) film, the anti-twist layer 2 and the anti-twist layer 6 is a spanbond long fiber nonwoven fabric (T1), the reinforcing sound absorption layer (3) and reinforcing sound absorption The layer 5 is a high strength needle short fiber nonwoven fabric (T2), the center layer 4 is a high strength needle short fiber nonwoven fabric (T3), and the back layer 7 is a urethane foam on the outer surface of the high heat resistant PET film. Or consist only of urethane foam.

The epidermal layer 1 is made of a high heat-resistant polyethylene terephthalate (PET) film of 30 ~ 300㎛ thickness to smooth the surface, has a waterproof function, and exhibits a heat resistance temperature in the range of 150 ~ 200 ℃.

The span bond long fiber nonwoven fabric (T1) forming the anti-twist layer (2) and the anti-twist layer (6) is fiberized by melt spinning polyethylene terephthalate (PET) or polypropylene (PP) in a well-known melt spun method, and web It is a long-fiber nonwoven fabric produced by combining the, the fineness of the fiber is 50 to 300 denier (denier), the weight is prepared to have a range of 30 ~ 150g / ㎡. The span bond long fiber nonwoven fabric (T1) forming the anti-twist layer (2) and the anti-twist layer (6) has a lower elongation as compared to the nonwoven layer prepared by needle punching, while the tensile strength is high to suppress deformation by heat after manufacture. It is effective to

Since the span bond nonwoven fabric has no difference in mechanical strength between the machine direction MD and the vertical direction CM, the warp prevention layer 2 and the warpage prevention layer 6 of the present invention made of the span bond nonwoven fabric T1. Has a function of suppressing warping due to heat generated in the engine.

The reinforcing sound absorption layer 3 and the reinforcement sound absorption layer 5 have a function of reinforcing the mechanical properties of the engine cover for a vehicle as a finished product and a sound absorption function.

The high strength needle short fiber nonwoven fabric (T2) forming the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 is a RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) 20 as a nonwoven fabric having a weight of 200 to 1500 g / m 2. ~ 50 parts by weight, polyethylene terephthalate (PET) is composed of 50 to 80 parts by weight of fibers, 4 to 15 denier (denier), non-woven fabric for web bonding by carding, web formation and needle punching from fibers of 64 ~ 76㎜ length It is prepared according to the method.

When less than 50 parts by weight of polyethylene terephthalate (PET) fibers are included in the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5, it is difficult to serve as a reinforcing layer providing durability and formability, and polyethylene terephthalate (PET) When more than 80 parts by weight of fiber is included RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) to bond between the polyethylene terephthalate (PET) fibers of the reinforcing sound absorbing layer (3) and the reinforcing sound absorbing layer (5) The lack of may reduce the bonding function between the short fibers of the reinforcing layer.

When the RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) is contained in 20 to 50 parts by weight in the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5, the bonding force of polyethylene terephthalate (PET) fiber serving as a substrate This increases and can solve the problem of tearing during molding of the finished product, the degree of orderability is secured, and durability can be maintained. In addition, when the RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) is 20 parts by weight or less, the sound absorption is increased, but the bonding strength between the short fibers is lowered, tensile strength, flexural strength, bone elastic modulus are all lowered, low melting point When the fiber is 50 parts by weight or more, the bonding strength between the short fibers is increased to increase the tensile strength and flexural strength, while the bone elastic modulus is lowered and the sound absorption is also lowered.

The high strength needle short fiber nonwoven fabric (T3), which is the central layer 4, is a nonwoven fabric having a weight of 200 to 1500 g / m 2, and 30 to 70 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), polyethylene terephthalate (PET). ) A nonwoven fabric composed of 30 to 70 parts by weight of fibers and made from fibers having a fineness of 4 to 15 denier and a length of 64 to 76 mm. The RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) is preferably a polyethylene terephthalate (PET) fiber having a melting point of 130 ~ 180 ℃.

The ratio of the RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) of the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 is relatively smaller than that of the center layer 4 so that the melt-bonded portion is laminated. To reduce the number of pores between the short fibers to have a sound absorption function, the center layer (4) is the ratio of the RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber) reinforcing sound absorption layer (3) and reinforcing sound absorption layer ( Compared to 5), when the composition is laminated with a relatively large amount, there are many melt-bonded portions, so that the fibers are tightly bonded to improve strength and sound insulation, so that the center layer 4 is formed to have a structure having high strength with sound insulation at the center. It consists of

And briefly explaining the manufacturing process of the engine cover of the multi-layer structure according to the present invention,

High-strength needle short-fiber nonwoven fabric (T2) according to the first step of the span bond long fiber nonwoven fabric (T1) according to the anti-twist layer (2) and the anti-twist layer (6), the reinforcing sound absorption layer (3) and the reinforcing sound absorption layer (5) ) Two sheets and one high strength needle short fiber nonwoven fabric (T3) according to the center layer 4 are prepared and prepared in separate processes, respectively.

In the second step, a laminate (a) was prepared in which a high strength needle short fiber nonwoven fabric (T2) as the reinforcing sound absorption layer (3) was laminated on the span bond long fiber nonwoven fabric (T1) as the anti-twist layer (2), and reinforced in the same manner. The laminated body (b) which laminated | stacked the high strength needle short fiber nonwoven fabric T2 which is the sound absorption layer 5, and the spanbond long fiber nonwoven fabric T1 which is the distortion prevention layer 6, respectively is manufactured.

In the third step, the laminate (a) and the laminate (b) manufactured in the second step are bonded to the upper and lower surfaces of the high strength needle short fiber nonwoven fabric T3 as the center layer 4.

In the fourth step, the heat-resistant polyethylene terephthalate (PET) film of the back layer 7 is fused to the surface of the laminate b bonded to the bottom surface of the center layer 4 by flame heating, and the back layer 7 The urethane foam is formed on the highly heat resistant polyethylene terephthalate (PET) film.

In the fifth step, the heat-resistant polyethylene terephthalate (PET) film of the skin layer 1 is fused by the flame heating to the surface of the laminate (a) bonded to the upper surface of the center layer 4, and finally the skin layer 1, Multi-layered laminate, which is a material of an engine cover for a vehicle composed of the anti-twist layer (2), the reinforcing sound absorbing layer (3), the center layer (4), the reinforcing sound absorbing layer (5), the anti-twisting layer (6), and the back layer (7). (S) is manufactured.

Finally, the skin layer 1, the anti-twist layer 2, the reinforcing sound absorbing layer 3, the center layer 4, the reinforcing sound absorbing layer 5, the anti-twisting layer 6 and the back layer 7, the back layer 7 ) May be a case where a urethane foam is formed on a high heat resistant polyethylene terephthalate (PET) film and a case where only a urethane foam is formed without a high heat resistant polyethylene terephthalate (PET) film.

<Example 1 and Example 2>

Prepare the material according to each layer according to the composition and proportion shown in the following [Table 1] and [Table 2], and reinforce the skin layer (1), anti-twist layer (2) from above by the manufacturing process of the present invention described above A laminate S having a multi-layered structure, which was sequentially laminated with a sound absorbing layer 3, a center layer 4, a reinforcing sound absorbing layer 5, a distortion prevention layer 6, and a back layer 7, was prepared.

division Ingredients and ratios (parts by weight)  Remarks Epidermal layer (1) 150㎛ thick, heat resistant PET film Anti-twist layer (2)  100D, PET fiber spanbond nonwoven fabric, 100g / ㎡
Reinforcement sound absorption layer (3) High Strength RM / LM Fiber 20, PET Fiber 80 Needle Nonwoven Fabric
Fineness 6D, 71mm in length
500g / ㎡
Core layer (4) High Strength RM / LM Fiber 35, PET Fiber 65 Needle Nonwoven Fabric
Fineness 10D length 71mm
500g / ㎡
Reinforcement sound absorption layer (5) High Strength RM / LM Fiber 20, PET Fiber 80 Needle Nonwoven Fabric
Fineness 6D, 71mm in length
500g / ㎡ Anti-twist layer (6)  100D, PET Fiber Spunbond Nonwoven Fabric 100g / ㎡ Back layer (7) Thickness 200㎛, Heat Resistant PET Film Urethane Foam Formation (Engine Side)

division Ingredients and ratios (parts by weight)  Remarks Epidermal layer (1) 100㎛ thick, heat resistant PET film Anti-twist layer (2)  200D, PET Fiber Spunbond Nonwoven Fabric, 100g / ㎡
Reinforcement sound absorption layer (3) High Strength RM / LM Fiber 20, PET Fiber 80 Needle Nonwoven Fabric
Fineness 4D, 71mm in length
500g / ㎡
Core layer (4) 15D High Strength RM / LM Fiber 35, PET Fiber 65 Needle Nonwoven Fabric
Fineness 4D, 71mm in length
500g / ㎡
Reinforcement sound absorption layer (5) 4D, High Strength RM / LM Fiber 20, PET Fiber 80 Needle Nonwoven
Fineness 4D, 71mm in length
500g / ㎡ Anti-twist layer (6)  200D, PET Fiber Spunbond Nonwoven Fabric 100g / ㎡ Back layer (7) Urethane Foam (Engine Side)

<Test Example>

The engine cover was molded and produced in accordance with a conventional method from the laminate S of the multilayer structure manufactured in the above-described <Example 1> and <Example 2>.

3 is a real picture of the engine cover manufactured by an embodiment of the present invention, Figure 4 is a real picture of the engine undercover manufactured by an embodiment of the present invention.

The test piece was prepared from the prepared engine cover, and the test piece was kept at a water content of 0.2% or less, and then the test was performed with the test items below, and the results are shown in the following [Table 3] and [Table 4].

Test Method for Test Items

1. specific gravity; The method specified in ASTM D 792.

2. ASH content; The method specified in ASTM D 5630.

3. tensile strength; The method specified in ASTM D 638. However, test speed 5 mm / min

4. flexural strength and flexural modulus; The method specified in ASTM D 790. However, the specimen size is 12.7 × 12.7 × 6.4 mm, the test speed is 3 mm / min

5. IZ0D impact strength; The method specified in ASTM D 256. However, the specimen size is 63.5 × 12.7 × 6.4㎜ and the notched specimens are used, and the low-temperature specimens are tested within 3 seconds after maintaining for 3 hours in a chamber at 30 ℃.

6. heat deflection temperature; The method specified in ASTM D 648. However, the specimen size is 12.7 × 12.7 × 6.4 mm, the stress load is 18.6 kgf / ㎠.

7. sound insulation; Permeation Loss Measurement with Apamat-II

8. sound absorption rate; Evaluated by damping factor according to KS F 2805 (average value at 250, 500, 1000, 2000 Hz)

Test Items
unit Test result
Test Methods Example 1 Example 2 importance - 1.1 1.1


Listed above
See test method ASH content % 20 ± 2 20 ± 5
The tensile strength MD
Kgf / ㎠ 1300 1320 CD 2000 2130
Flexural strength MD
Kgf / ㎠ 1500 1510 CD 1800 1805 curve
Modulus MD
MPa 4400 4390 CD 4400 4375 IZOD
Impact strength 23 ℃
Kg · cm / cm 3.0 3.1 -30 ℃ 2.5 2.5 Heat Deflection Temperature (Heat Resistance) ℃ 180 180

Test Items Test result Remarks
Sound insulation 1,000 Hz 36
Transmission loss measurement with Apamat-II [dB] 2,000 Hz 45 3,150 Hz 48 5,000 Hz 53 Sound absorption Average value at 500, 1000, 2000 Hz 0.85 Noise Reduction Factor (NRC)

As shown in [Table 3] and [Table 4], the vehicle engine cover according to the present invention has a relatively small deviation between the horizontal direction and the vertical direction, and the sound insulation is high in proportion to the frequency, and the sound insulation is excellent. , The sound absorption rate is excellent because the higher the average value at 500, 1000, 2000Hz, it can be confirmed that the sound insulation of the vehicle trunk mat according to the present invention is also excellent.

Claims (6)

In the engine cover of a vehicle having a multilayer structure consisting of a skin layer (1), a distortion prevention layer (2), a reinforcement sound absorption layer (3), a center layer (4), a reinforcement sound absorption layer (5), a distortion prevention layer (6) and a back layer (7) In
The epidermal layer 1 is a high heat resistant polyethylene terephthalate (PET) film,
The anti-twist layer 2 and the anti-twist layer 6 is a span bond long fiber nonwoven fabric (T1),
The reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 are 20 to 50 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), high strength composed of 50 to 80 parts by weight of polyethylene terephthalate (PET) fiber Needle short fiber nonwoven fabric (T2),
The core layer 4 is a high strength needle short fiber nonwoven fabric (T3) composed of 30 to 70 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), 30 to 70 parts by weight of polyethylene terephthalate (PET) fiber ,
The rear layer (7) is a vehicle engine cover of a multi-layer structure, characterized in that the urethane foam is formed. The method according to claim 1, wherein the reinforcing sound absorption layer 3 and the reinforcing sound absorption layer 5 is 20 to 30 parts by weight of RM fiber or LM fiber (Rapid Melting Fiber or Low Melting Fiber), polyethylene terephthalate (PET) fiber 70 to 80 weight High strength needle short-fiber nonwoven fabric (T2) is composed of a portion, the center layer 4 is 30 to 50 parts by weight of RM fibers or LM fibers (Rapid Melting Fiber or Low Melting Fiber), 50 to 70 parts by weight polyethylene polyethylene terephthalate (PET) fibers Multi-layered vehicle engine cover, characterized in that the high-strength needle short-fiber nonwoven fabric (T3) formed by a negative portion. The vehicle engine cover according to claim 1 or 2, wherein the high heat resistant polyethylene terephthalate (PET) film of the skin layer (1) has a thickness of 30 to 300 µm and a heat resistance temperature of 150 to 200 ° C. 4. The multi-layered vehicle engine according to claim 3, wherein the twist bond nonwoven fabric T1 of the anti-twist layer 2 and the anti-twist layer 6 is made of polyethylene terephthalate (PET) fiber or polypropylene (PP) fiber. cover. The multi-layered vehicle engine cover according to claim 4, wherein the back layer (7) is formed of a urethane foam on a high heat resistant PET film and an outer surface thereof. Of the engine cover for a vehicle having a multilayer structure consisting of a skin layer (1), a distortion prevention layer (2), a reinforcing sound absorption layer (3), a center layer (4), a reinforcement sound absorption layer (5), a distortion prevention layer (6) and a back layer (7). In the manufacturing method,
a). High-strength needle short-fiber nonwoven fabric (T2) according to the first anti-twist layer (2) and the anti-twist layer (6), the reinforcing sound absorbing layer (3) and the reinforcing sound absorbing layer (5) ) Preparing and preparing two sheets of high strength needle short fiber non-woven fabric (T3) according to the two sheets and the center layer 4 in a separate process,
b). In the second step, a lamination agent (a) obtained by laminating the high strength needle short fiber nonwoven fabric (T2), which is the reinforcing sound absorption layer (3), and the span bond long fiber nonwoven fabric (T1), which is the anti-twist layer (2), was prepared and reinforced in the same manner. Manufacturing a laminate (b) in which a high strength needle short fiber nonwoven fabric (T2) that is a sound absorbing layer (5) is laminated with a span bond long fiber nonwoven fabric (T1) that is a twist prevention layer (6),
c). Bonding the laminate (a) and the laminate (b) prepared in the second process to the upper and lower surfaces of the high strength needle short fiber nonwoven fabric T3 as the center layer 4 in a third process;
d). In the fourth step, the heat-resistant polyethylene terephthalate (PET) film of the back layer 7 is fused to the surface of the laminate b bonded to the bottom surface of the center layer 4 by flame heating, and the back layer 7 Forming a urethane foam on a high heat resistant polyethylene terephthalate (PET) film,
e) Fusing the high heat-resistant polyethylene terephthalate (PET) film of the epidermal layer 1 by flame heating with the warpage prevention layer 6 which is the surface of the laminate (a) bonded to the upper surface of the center layer 4 in the fifth step. Method of manufacturing a vehicle engine cover of a multi-layer structure, characterized in that it comprises a step of bonding the skin layer (1) as a film.

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