KR20190073708A - Engine cover and engine undercover of multi- rayer for vehicles - Google Patents

Abstract

The present invention relates to a vehicle engine cover or an engine undercover having a multi-layered structure comprising a surface layer (1), a distortion preventing layer (2), a reinforcing sound absorbing layer (3), a center layer (4), a reinforcing sound absorbing layer (5), a distortion preventing layer (6) and a rear surface layer (7). The vehicle engine cover or the engine undercover having a multi-layered structure of the present invention bonds the reinforcing sound absorbing layer (3) and the reinforcing sound absorbing layer (5) to top and bottom surfaces of the center layer (4) to maintain a strength of a center part strongly and improve sound absorbing and insulating properties, stacks a film layer or a water repellent and anti-fouling coated fabric layer on the surface layer to prevent submersion of the engine, and is relatively light-weighted in terms of a multi-layered structure inhibiting contamination.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle engine cover and an engine under cover, and more particularly, to an engine cover and an engine under cover which absorb vibration and noise of a vehicle well and are made of heat resistant and lightweight materials.

The engine cover and the engine under cover of the vehicle are exterior materials mounted on the outside of the engine to protect the engine from the external environment while the vehicle is running and to make the engine room look neat, It is a matter of course that the surface properties should be good, but materials having good mechanical properties, shock absorber, light weight, and heat resistance are demanded.

Conventional engine covers and engine under covers are made of nylon or PET resin, which is made by injection molding with glass fiber that imparts heat resistance, and then fastened as an upper stay and bolt to the engine. However, There is a problem such as deterioration of the work environment such as falling of the polyurethane resin, and the foamed urethane layer is formed on the engine side and the polyamide resin is injected thereinto, but the weight of the material is increased.

In the prior art relating to the material of the engine cover and the engine under cover, for example, in Patent Document 1, 38 to 84.98% by weight of a polyamide resin, 5 to 20% by weight of glass fibers on a glass base, 5 to 20% 0.02 to 2% by weight of a glass bubble and 5 to 20% by weight of a glass bubble. However, since the resin cover is a synthetic resin molding, there is a problem in that the overall weight of the engine cover increases, Patent Document 2 discloses a sound absorbing material for an engine cover in which a first felt layer and a second felt layer, which are produced by carding low melting point PET fibers and regular PET fibers and needle punched, In Patent Document 3, a high rigidity material made of PP (polypropylene, 11a) and G / F (glass fiber, 11b) is preheated and cold formed to form a microfine sound absorbing material 15) And the foamed boss 12 made of a urethane rigid foam is inserted and molded by injection molding to form a composite material 11, and then the foamed boss 12, which is made of a urethane hard foam, Discloses an integral type engine cover which realizes absorption and sound insulation, but the prior art relates mainly to the sound absorption of the engine cover.

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

Patent Document 1; Korean Registered Patent Publication No. 10-0828654 Patent Document 2; Korean Patent Registration No. 10-1470478 Patent Document 3; Korean Registered Patent Publication No. 10-1717622

The present invention relates to a vehicle engine cover and an engine under cover having a multilayer structure, and more particularly to a vehicle engine cover and an engine under cover which are made of a multi-layer structure material that absorbs vibration and noise of a vehicle well, And the like.

The anti-warp layer 2, the reinforcing sound-absorbing layer 3, the center layer 4, the reinforcing sound-absorbing layer 5, and the reinforcing sound-absorbing layer 5 as the solution for the engine cover and the engine under cover of the multi- , An anti-warp layer (6) and a back layer (7), wherein the skin layer (1) is a high heat resistant polyethylene terephthalate (PET) film or a water repellent antifouling coated fabric, The anti-warp layer 2 and the anti-warp layer 6 are spunbond long fibrous nonwoven fabric T1, and the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5 are made of RM / LM fiber (Rapid Melting / Low Melting Fiber) (T2) composed of 20 to 50 parts by weight of a polyethylene terephthalate (PET) fiber and 50 to 80 parts by weight of a fiber, and the core layer (4) is a fabric. The backside layer 7 is formed of a high heat-resistant polyethylene terephthalate (PET) film and a urethane foam formed on the outer surface thereof or a urethane foam.

The skin layer 1 according to the present invention is characterized in that the high heat-resisting polyethylene terephthalate (PET) film is made of a high heat-resistant polyethylene terephthalate (PET) film having a thickness of 30 to 300 μm to smooth the surface, 200 C < / RTI >

The skin layer 1 according to the present invention is any fabric selected from a fabric A, a fabric B, a fabric C and a fabric D,

The fabric A is made of polyethylene terephthalate filament with a fineness of 250 to 350 Denier and warped with a polyethylene terephthalate filament of 550 to 650 Denier The fabric (B) woven in a 43 x 50 fabric with a weft was fabricated by knitting a polyethylene DTY filament with a fineness of 120-180 Denier into a woven fabric, fabric (C ) Is a fabric obtained by knitting a polyethylene terephthalate false twist yarn (PET DTY filament) having a fineness of 250 to 350 denier into a knitted fabric and the fabric (D) is a fabric obtained by weaving a polyethylene terephthalate false twist yarn of a filament size of 250 to 350 Denier DTY filament yarn warp and PET DTY filament yarn of 400 to 500 denier as a weft yarn in a 90 x 37 filament yarn.

A hot-melt layer (not shown) having a surface density of 30 to 70 g / m 2 is placed between the skin layer and the anti-warp layer 2 of the fabric according to the present invention. This hot-melt layer (not shown) functions as a binder for bonding the skin layer, which is a fabric, and the anti-warp layer 2.

The spun bond continuous fibrous nonwoven fabric T1 forming the anti-warp layer 2 and the anti-warp layer 6 according to the present invention is obtained by melt-spinning polyethylene terephthalate (PET) or polypropylene (PP) by a well- Fibrous nonwoven fabrics made by combining fibers and webs, and the fineness of the fibers is 50 to 300 denier and the weight is 30 to 150 g / m 2.

The spunbonded nonwoven fabric has no difference in mechanical strength between the machine direction MD and the machine direction CM so that the anti-warp layer 2 and the anti-warp layer 6 of the present invention, which are made of the spunbonded nonwoven fabric T1, Has a function of suppressing warping due to heat generated in the engine.

The high-strength needleless nonwoven fabric T2 forming the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5 is a nonwoven fabric having a surface density of 200 to 1500 g / m 2 and is made of RM / LM fiber (Rapid Melting / Low Melting Fiber) 50 to 80 parts by weight of a polyethylene terephthalate (PET) fiber and having a fineness of 4 to 15 deniers and a length of 64 to 76 mm, according to a well-known method for producing a nonwoven fabric, To the web.

And the core layer 4 is any fabric selected from the group consisting of a fabric E, a fabric F, a fabric G and a fabric H. The fabric E has a fineness of 30 to 100 deniers Fabrics F fabricated in a 30 x 35 fabric with a low melting filament as a warp and polyethylene terephthalate filament weft are wefted at 30 to 100 denier Fabrics (G) woven in a 40 × 50 fabric with a low melting point filament of Denier as a warp and polyethylene terephthalate filament as weft were wefted with a fineness 800 To 1200 Denier Polyethylene Terephthalate (PET) High Strength Low Stretch Yarn Fabrics woven in 18x18 organization with flat warp and polyethylene terephthalate (PET) high strength low stretch yarn weft , The fabric (H) is a polyethylene terephthalate (PET) high-strength low-density polyethylene (Denier) having a fineness of 1300 to 1700 Denier By the twist yarn and a polyethylene terephthalate (PET) high-strength low-stretch yarn to the tilt (warp) to the weft yarn (weft) it may be formed of any of a woven fabric by 14 × 14 in one organization.

When the core layer 4 according to the present invention is selected as a fabric, it is preferable that the difference in mechanical strength between the machine direction MD and the machine direction CM, The strength according to the center layer 4 can be designed appropriately by selecting any one of them.

Layer structure composed of the skin layer 1 according to the present invention, the anti-warp layer 2, the reinforcing sound-absorbing layer 3, the center layer 4, the reinforcing sound-absorbing layer 5, the anti-warp layer 6 and the back layer 7 A method of manufacturing an engine cover or an engine undercover for a vehicle, comprising the steps of: a). In the first step, the high-strength needleless nonwoven fabric T2 (T2) according to the twist preventing layer 2 and the twist preventing layer 6, the spun bond long-fiber nonwoven fabric T1, the reinforcing sound-absorbing layer 3 and the reinforcing sound- ) And a fabric according to the center layer (4) are separately prepared and prepared. A laminate (a) in which a spunbond long-fiber nonwoven fabric (T1), which is an anti-warp layer (2), is laminated on a high strength needlenose single-fiber nonwoven fabric (T2) as a reinforcing sound-absorbing layer (3) C) forming a layered product (b) in which a spun bond fibrous nonwoven fabric (T1), which is an anti-warp layer (6), is laminated on a high strength needlenose short fiber nonwoven fabric (T2) D) bonding the layered product (a) and the layered product (b) prepared in the second step to the upper and lower surfaces of the fabric, which is the center layer (4), in the third step; Heat-resistant polyethylene terephthalate (PET) film of the backing layer 7 is fused to the surface of the layered product (b) bonded to the lower surface of the core layer 4 by flame heating in the fourth step, E) forming a urethane foam on the high heat-resistant polyethylene terephthalate (PET) film of the layered product (a) bonded to the upper surface of the core layer 4 in the fifth step, Heat-resistant polyethylene terephthalate (PET) film of the surface layer 1 to the surface layer 1 as a film.

In the fifth step according to the present invention, a hot-melt layer (not shown) is provided between the anti-warp layer 6, which is the surface of the layered product a bonded to the upper surface of the center layer 4, (Step 5-1) of bonding the fabric of the surface layer 1 with the anti-warp layer 2 to bond the surface layer 1 by heating the flame to heat the hot melt layer . ≪ / RTI >

The multi-layered vehicle engine cover or engine undercarrier of the present invention has the effect of enhancing the mechanical strength and the sound absorption sound of the engine cover or the engine under cover by laminating the reinforcing sound-absorbing layer at the upper and lower portions of the center layer.

The surface layer of the fabric is formed by laminating a water-repellent and antifouling coated fabric layer to prevent flooding of the engine and to inhibit contamination. The surface layer of the film layer has a smooth surface, has a waterproof function, Heat resistance, and the backside layer is formed as a high heat-resistant film to satisfy the mechanical strength, sound absorption and heat resistance required by the engine cover or the engine under cover, and has a multilayer structure and relatively light weight.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic representation of a cross-section of an embodiment in which the skin layer in the engine cover or engine under cover of the present invention is a film layer and the back layer has a film and a urethane foam. Fig.
Figure 1b is a schematic representation of a cross section of an embodiment in which the skin layer in the engine cover or engine under cover of the present invention is a film layer and the backing layer has a urethane foam.
Figure 2a schematically shows a cross section of an embodiment in which the skin layer in the engine cover or engine under cover of the present invention is a fabric layer and the backing layer has a film and a urethane foam.
Figure 2b is a schematic representation of a cross-section of an embodiment in which the skin layer in the engine cover or engine undercover of the present invention is a fabric layer and the backing layer comprises only urethane foam.
Fig. 3 is a photograph of an engine cover manufactured by an embodiment in which the skin layer of the present invention is a fabric layer.
Fig. 4 is a photograph of an engine under cover produced by an embodiment in which the skin layer of the present invention is a fabric layer.

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

1A is a schematic view showing a cross section of an embodiment in which a skin layer is a film layer and a back layer has a film and a urethane foam in an engine cover or an engine under cover of the present invention, In which the skin layer is a film layer and the backside layer is a urethane foam.

Referring to FIGS. 1A and 1B, a description will be made of an embodiment in which the skin layer of the structure of the engine cover or the engine under cover of the vehicle of the present invention has the film layer,

The vehicle engine cover or engine under cover having a multilayer structure according to the present invention comprises a skin layer 1, a warp preventing layer 2, a reinforcing sound-absorbing layer 3, a center layer 4, a reinforcing sound-absorbing layer 5, 6 and a backing layer 7.

Wherein the skin layer 1 is a high heat-resistant polyethylene terephthalate (PET) film and the anti-warp layer 2 and the anti-warp layer 6 are spunbond long-fiber nonwoven fabric T1 and the reinforcing sound- Layer 5 is a high tenacity needle short fiber nonwoven fabric (T2) composed of 20 to 50 parts by weight of RM / LM fiber (Rapid Melting / Low Melting Fiber) and 50 to 80 parts by weight of polyethylene terephthalate (PET) fiber, (4) is a fabric. The back layer 7 may be formed of a high heat-resistant high heat-resistant polyethylene terephthalate (PET) film and a urethane foam formed on the outer surface thereof or a urethane foam.

The skin layer 1 is made of a high heat-resistant polyethylene terephthalate (PET) film having a thickness of 30 to 300 탆, smoothes the surface, has a waterproof function, and exhibits a heat-resistant temperature in the range of 150 to 200 캜.

The reinforcing sound-absorbing layer (3) and the reinforcing sound-absorbing layer (5) have a function of reinforcing the mechanical properties of the finished vehicle engine cover or engine under cover and sound absorbing function.

The high strength needle-knit nonwoven fabric T2 forming the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5 is a non-woven fabric having a weight of 200 to 1500 g / m 2 and is made of RM / LM fibers (Rapid Melting / Low Melting Fiber) By weight, and 50 to 80 parts by weight of a polyethylene terephthalate (PET) fiber, and having a fineness of 4 to 15 denier and a length of 64 to 76 mm by carding, web forming and needle punching Web combined.

When the polyethylene terephthalate (PET) fiber is contained in less than 50 parts by weight in the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5, it is difficult to serve as a reinforcing layer for imparting durability and formability, and polyethylene terephthalate (PET) LM fiber (Rapid Melting / Low Melting Fiber) bonding between the polyethylene terephthalate (PET) fibers of the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5 when the fibers are contained in an amount of 80 parts by weight or more The bonding function between the short fibers of the reinforcing layer may be deteriorated.

When the RM / LM fiber (Rapid Melting / Low Melting Fiber) is included in the reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5, the bonding strength of the polyethylene terephthalate (PET) fiber serving as a base is increased And it is possible to solve the problem of tearing upon molding the finished product, securing the water repellency, and maintaining the durability. In addition, when the RM / LM fiber (Rapid Melting / Low Melting Fiber) is 20 parts by weight or less, the sound absorption rate is high, but the bonding strength between the short fibers is lowered to lower the tensile strength, flexural strength and skew elasticity, When the amount is more than 50 parts by weight, the bonding strength between the short fibers is increased, so that the tensile strength and the bending strength are increased while the modulus of elasticity is decreased and the sound absorption rate is also lowered.

The spun bond continuous fibrous nonwoven fabric T1 forming the anti-warp layer 2 and the anti-warp layer 6 according to the present invention is obtained by melt-spinning polyethylene terephthalate (PET) or polypropylene (PP) by a well- Fibrous nonwoven fabrics made by combining fibers and webs, and the fineness of the fibers is 50 to 300 denier and the weight is 30 to 150 g / m 2. The spun bond continuous fibrous nonwoven fabric (T1) forming the anti-warp layer (2) and the anti-warp layer (6) has a lower elongation than the nonwoven fabric layer produced by needle punching, while the tensile strength is high, .

The spunbonded nonwoven fabric has no difference in mechanical strength between the machine direction MD and the machine direction CM so that the anti-warp layer 2 and the anti-warp layer 6 of the present invention, which are made of the spunbonded nonwoven fabric T1, Has a function of suppressing warping due to heat generated in the engine.

The core layer 4 is a fabric using coarse fibers and has high tensile strength, flexural strength, and flexural modulus, which are advantages of the fabric, and serves as a base for a finished vehicle engine cover or engine undercover.

The center layer 4 binds the reinforcing sound-absorbing layer 5 and the reinforcing sound-absorbing layer 3 interposed between the reinforcing sound-absorbing layer 4 and the non-woven fabric layer 5 as the upper and lower layers of the center layer , Tearing at the time of molding an engine cover for an automobile or an engine under cover is relieved, and the flexural strength and flexural elasticity ratio are supplemented.

The fabric layer preferably has a weight of 1200 to 1600 g / m 2. When the weight of the fabric layer is less than 1200 g / m 2, the tensile strength and flexural modulus are insufficient. When the weight of the fabric layer is more than 1600 g / It is an unnecessary weight increase exceeding the strength.

The core layer 4 may be any fabric selected from the fabric E, the fabric F, the fabric G and the fabric H. [

The core layer 4 is any fabric selected from the group consisting of a fabric E, a fabric F, a fabric G and a fabric H.

The fabric (E) is fabricated by weaving a low melting point filament of 30-100 denier into warp and weft of polyethylene terephthalate filament (PET DTY filament) The fabric F was fabricated by weaving a low melting point filament of 30-100 Denier as warp and a polyethylene DTY filament as weft 40 (PET) high tenacity low stretch yarn flat warp and a polyethylene terephthalate (PET) high tenacity low stretch yarn with a size of 800 to 1200 denier (Denier) (H) fabric was woven into an 18 × 18 fabric with a weft of 20 to 1800 and a twist of polyethylene terephthalate (PET) high tenacity low elastic yarn with a fineness of 1300 to 1700 Denier was warp, Phthalate (PET) High strength Low stretch yarn is wefted Or woven fabrics in a 14 x 14 texture.

division Fabric organization
(Fabric structure)
direction
Tensile strength (N)
Flexural Strength (N)
Flexural modulus (MPa) Example 1
Fabric E
30 × 35 MD 1829 16 85 CD 3888 21 99 2 Example 1
Fabric F
40 x 50 MD 2071 14 105 CD 2187 14 106 Example 3
Fabric G
18 x 18 MD 1891 14 87 CD 2345 15 102 Example 4
Fabric H
14 x 14 MD 2187 13 80 CD 2004 15 84

As shown in Table 1, when the core layer 4 according to the present invention is selected as a fabric, the mechanical strength difference between the machine direction MD and the machine direction CM according to each fabric is The strength according to the center layer 4 can be appropriately designed by selecting any one of the fabric E to the fabric H suitably adjusted.

FIG. 2A is a schematic view showing a cross section of an embodiment in which the skin layer and the back layer of the engine cover or the engine under cover of the present invention each have a film and a urethane foam, and FIG. 2B is a cross- A schematic representation of a cross-section of an embodiment in which the skin underneath the engine undercover is a fabric layer and the backing layer consists only of a urethane foam. FIG. 3 is a photograph of an engine cover manufactured by an embodiment in which the skin layer of the present invention is a fabric layer, and FIG. 4 is a photograph of an engine undercover manufactured by an embodiment in which the skin layer of the present invention is a fabric layer.

Referring to FIGS. 2A and 2B, a description will be made of an embodiment in which the skin layer of the engine cover or the engine under cover of the multi-layer structure of the present invention has a fabric layer,

The vehicle engine cover or engine under cover of the multi-layer structure according to another embodiment of the present invention includes a skin layer 1, a hot melt layer (not designated), a warp preventing layer 2, a sound absorbing layer 3, The reinforcing sound-absorbing layer 5, the anti-warp layer 6, and the back layer 7. This is because the skin layer 1 is a fabric, and a hot-melt layer (not shown) is added for bonding the fabric as the skin layer to the anti-warp layer 2. The reinforcing sound-absorbing layer 3, the center layer 4, the reinforcing sound-absorbing layer 5, the anti-warp layer 6, and the back layer 7, which are other multilayered structures, except for the skin layer 1, Are the same.

The skin layer 1 according to another embodiment of the present invention is any fabric selected from a fabric A, a fabric B, a fabric C and a fabric D.

The fabric A is made of polyethylene terephthalate filament with a fineness of 250 to 350 Denier and warped with polyethylene terephthalate filament of 550 to 650 denier, And the fabric (B) was woven in a 43 x 50 fabric with wefts of 100-180 denier (Denier), and the fabric (B) was woven in a woven fabric of polyethylene terephthalate filament C) is a woven fabric made by knitting a polyethylene terephthalate filament yarn with a fineness of 250 to 350 denier into a knitted fabric, the fabric D is a woven fabric obtained by knitting a polyethylene terephthalate false twist yarn (Denier) having a fineness of 250 to 350 Denier A PET DTY filament of 400 to 500 denier and a PET DTY filament of warp weight of 90 x 37 in a weft warp yarn. .

The skin layer 1 is a fabric using relatively thick fibers as compared with a nonwoven fabric. The skin layer 1 has a high tensile strength, bending strength and flexural modulus, which are advantages of the fabric, and suppresses tearing during molding due to pressing.

A hot-melt layer (not shown) having a surface density of 30 to 70 g / m 2 is placed between the skin layer and the anti-warp layer 2 of the fabric according to the present invention. The hot-melt layer (functioning as a reference numeral) functions as a binder for bonding the skin layer, which is a fabric, and the anti-warp layer 2.

The structure of the above-mentioned twist preventing layer 2, the reinforcing sound-absorbing layer 3, the center layer 4, the reinforcing sound-absorbing layer 5, the anti-warp layer 6 and the back layer 7 is the same as that of the above- And thus a detailed description thereof will be omitted.

The manufacturing process of the engine cover or the engine under cover of the multi-layer structure according to the present invention will be briefly described.

In the first step, the high-strength needleless nonwoven fabric T2 (T2) according to the twist preventing layer 2 and the twist preventing layer 6, the spun bond long-fiber nonwoven fabric T1, the reinforcing sound-absorbing layer 3 and the reinforcing sound- ) And one fabric according to the center layer (4) are separately prepared and prepared.

A laminate (a) in which a spunbond long-fiber nonwoven fabric (T1), which is an anti-warp layer (2), is laminated on a high-strength needlenose single-fiber nonwoven fabric (T2) as a reinforcing sound-absorbing layer (3) A laminate (b) obtained by laminating a spun bond long fibrous nonwoven fabric (T1), which is an anti-warp layer (6), on a high strength needlenose short fiber nonwoven fabric (T2)

In the third step, the laminate (a) and the laminate (b) produced in the second step are bonded to the upper and lower surfaces of the fabric, which is the core layer (4).

Heat-resistant polyethylene terephthalate (PET) film of the backing layer 7 is fused to the surface of the layered product (b) bonded to the lower surface of the core layer 4 by flame heating in the fourth step, The heat-resistant polyethylene terephthalate (PET) film of urethane foam is formed.

Heat-resistant polyethylene terephthalate (PET) film of the surface layer 1 is fused to the surface of the layered product (a) bonded to the upper surface of the core layer 4 by the flame heating in the fifth step, A multilayer structure which is a material of a vehicle engine cover or engine under cover composed of a distortion preventing layer 2, a reinforcing sound-absorbing layer 3, a center layer 4, a reinforcing sound-absorbing layer 5, a distortion preventing layer 6, To prepare a laminate (S) having a structure.

The fifth step is a case of a high heat-resistant polyethylene terephthalate (PET) film.

When the skin layer of another embodiment of the present invention has a fabric layer,

In the step 5-1, a hot-melt layer (not shown) is placed between the fabric and the anti-warp layer 2 of the layered product (a) produced in the second step, and the hot-melt layer The anti-warp layer 2, the reinforcing sound-absorbing layer 3, the center layer 4, the reinforcing sound-absorbing layer 5 (Fig. 5 (a)), and the warp- Layer structure S, which is the material of the engine cover or the engine under-cover for a vehicle, which is composed of the anti-warp layer 6, the back layer 7,

≪ Examples 1 to 4 >

Four types of fabrics as the core layer 4 shown in Table 1 were fabricated in the same manner as in Example 4 of Examples 1 to 5 in Table 2 except that only the fabric layer 5 according to each layer The core layer 4, the reinforcing sound-absorbing layer 5, the anti-warp layer (2), the anticorrosive layer 3, the reinforcing sound-absorbing layer 3, 6) and the back layer (7) in this order.

Example 1 division Composition Component and ratio (parts by weight)  Remarks The skin layer (1) Thick 150 占 퐉, high heat-resistant PET film The anti-warp layer (2)  100D, PET fiber spunbond nonwoven fabric, 100g / ㎡
The reinforcing sound-absorbing layer (3) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The center layer (4) Fabric A: Fabric structure 30 × 35 1,400g / ㎡
The reinforcing sound-absorbing layer (5) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The anti-warp layer (6)  10OD, PET fiber spunbonded nonwoven fabric 100g / ㎡ The backside layer (7) Thick 200 占 퐉, high heat-resistant PET film Urethane foam formation (engine side)

Example 2 division Composition Component and ratio (parts by weight)  Remarks The skin layer (1) Thick 150 占 퐉, high heat-resistant PET film The anti-warp layer (2)  100D, PET fiber spunbond nonwoven fabric, 100g / ㎡
The reinforcing sound-absorbing layer (3) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The center layer (4) Fabric B: Fabric structure 40 x 50 1,400g / ㎡
The reinforcing sound-absorbing layer (5) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The anti-warp layer (6)  100D, PET fiber spunbond nonwoven fabric 100g / ㎡ The backside layer (7) Thick 200 占 퐉, high heat-resistant PET film Urethane foam formation (engine side)

Example 3 division Composition Component and ratio (parts by weight)  Remarks The skin layer (1) Thick 150 占 퐉, high heat-resistant PET film The anti-warp layer (2)  100D, PET fiber spunbond nonwoven fabric, 100g / ㎡
The reinforcing sound-absorbing layer (3) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The center layer (4) Fabric C: Fabric structure 18 x 18 1,400g / ㎡
The reinforcing sound-absorbing layer (5) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm 500g / ㎡ The anti-warp layer (6)  100D, PET fiber spunbond nonwoven fabric 100g / ㎡ The backside layer (7) Thick 200 占 퐉, high heat-resistant PET film Urethane foam formation (engine side)

Example 4 division Composition Component and ratio (parts by weight)  Remarks The skin layer (1) Thick 150 占 퐉, high heat-resistant PET film The anti-warp layer (2)  100D, PET fiber spunbond nonwoven fabric, 100g / ㎡
The reinforcing sound-absorbing layer (3) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The center layer (4) Fabric D: Fabric structure 14 x 14 1,400g / ㎡
The reinforcing sound-absorbing layer (5) High strength RM / LM fiber 20, PET fiber 80 Needle nonwoven
Fineness 6D, length 71 mm
500g / ㎡ The anti-warp layer (6)  100D, PET fiber spunbond nonwoven fabric 100g / ㎡ The backside layer (7) Thick 200 占 퐉, high heat-resistant PET film Urethane foam formation (engine side)

<Test Example>

An engine cover was molded and manufactured from the laminate (S) of the multi-layer structure manufactured in the above <Examples 1 to 4> according to a conventional method.

Test specimens were prepared from the engine cover prepared above, and the specimens were kept at a moisture content of 0.2% or less, and then subjected to tests under test items. The results are shown in Table 6 and Table 7 below.

Test method for test items

1. Specific gravity; A method as defined in ASTM D 792.

2. ASH content; A method as defined in ASTM D 5630.

3. Tensile strength; A method as defined in ASTM D 638. However, the test speed was 5 mm / min

4. flexural strength and flexural modulus; ASTM D 790. However, the size of the test piece is 12.7 × 12.7 × 6.4 mm, the test speed is 3 mm / min

5. IZ0D impact strength; ASTM D 256. However, the size of the test piece is 63.5 × 12.7 × 6.4㎜ and the notched test piece is used. The low temperature test piece is held in a chamber of 30 ° C. for 3 hours and then within 3 seconds

6. Thermal deformation temperature; A method as defined in ASTM D 648. However, the specimen size is 12.7 × 12.7 × 6.4 mm and the stress load is 18.6 kgf / ㎠.

7. Car audio; Measurement of permeation loss with Apamat-II

8. Sound absorption rate; Evaluated by the coefficient of relaxation according to KS F 2805 (average value at 250, 500, 1000, 2000Hz)

Test Items
unit Test result
Test Methods Example 3 importance - 0.9


Above
See test method ASH content % 19 ± 5
The tensile strength MD
Kgf / cm2 2156 CD 2743
Flexural strength MD
Kgf / cm2 1658 CD 1869 curve
Modulus of elasticity MD
MPa 4327 CD 4413 IZOD
Impact strength 23 ℃
Kg · cm / cm 3.5 -30 ° C 3.0 Heat distortion temperature (heat resistance) ℃ 180

Test Items Test result Remarks
Car voice 1,000Hz 36
Measurement of transmission loss with Apamat-II [dB] 2,000Hz 49 3,150Hz 54 5,000Hz 58 Sound absorption rate Mean values at 500, 1000 and 2000 Hz 0.91 The noise coefficient (NRC)

As shown in [Table 7] and [Table 7], the vehicle engine cover according to the present invention has a relatively small deviation in the lateral direction and the longitudinal direction, , And the sound absorption rate is higher as the average value at 500, 1000, and 2000 Hz is higher, it can be confirmed that the automobile trunk mat according to the present invention has excellent sound absorption.

Claims (6)

A vehicle engine cover having a multilayer structure composed of a skin layer 1, a distortion preventing layer 2, a reinforcing sound-absorbing layer 3, a center layer 4, a reinforcing sound-absorbing layer 5, a torsion preventing layer 6, In the engine under cover,
The skin layer 1 is a high heat-resistant polyethylene terephthalate (PET) film or fabric,
The anti-warp layer 2 and the anti-warp layer 6 are spunbond long-fiber nonwoven fabric T1,
The reinforcing sound-absorbing layer 3 and the reinforcing sound-absorbing layer 5 are made of 20 to 50 parts by weight of RM / LM fiber (Rapid Melting / Low Melting Fiber) and 50 to 80 parts by weight of polyethylene terephthalate (PET) Is a fibrous nonwoven fabric (T2)
The center layer (4) is a fabric.
Wherein the back layer (7) is formed of a high heat-resisting PET film and a urethane foam on the outer surface thereof, or is a urethane foam. The method according to claim 1,
The high heat-resistant polyethylene terephthalate (PET) film of the skin layer (1) and the back layer (7) has a thickness of 20 to 30 占 퐉 and a heat-resistant temperature of 150 to 200 占 폚. The method according to claim 1,
The spunbond long-fiber nonwoven fabric T1 of the anti-warp layer 2 and the anti-warp layer 6 is made of polyethylene terephthalate (PET) fiber or polypropylene (PP) fiber. . The fabric according to claim 1, wherein the fabric of the center layer (4)
(E) fabric woven into a 30x35 fabric with a low melting point filament of 30-100 denier (Denier) as a warp and polyethylene terephthalate filament as a weft ),
A fabric having a 40 x 50 texture woven with polyethylene terephthalate PET (polyethylene terephthalate filament) as a warp and having a fineness of 30 to 100 denier (Low Melting Filament) ),
(Polyethylene terephthalate (PET) with a fineness of 800-1,200 denier (PET), a high strength low stretch fabric flat is warp and a polyethylene terephthalate (PET) high strength low stretch fabric is used as a weft. One fabric (G),
(Denier) polyethylene terephthalate (PET) high tenacity low stretch yarn twist is warp and polyethylene terephthalate (PET) high tensile low stretch yarn is weft. And the fabric (H) is a fabric. A vehicle engine cover having a multilayer structure composed of a skin layer 1, a distortion preventing layer 2, a reinforcing sound-absorbing layer 3, a center layer 4, a reinforcing sound-absorbing layer 5, a torsion preventing layer 6, A method of manufacturing an engine under cover,
a). In the first step, the high-strength needleless nonwoven fabric T2 (T2) according to the twist preventing layer 2 and the twist preventing layer 6, the spun bond long-fiber nonwoven fabric T1, the reinforcing sound-absorbing layer 3 and the reinforcing sound- ) And one fabric according to the center layer (4) are separately prepared and prepared,
b). A laminate (a) in which a spunbond long-fiber nonwoven fabric (T1), which is an anti-warp layer (2), is laminated on a high strength needlenose single-fiber nonwoven fabric (T2) as a reinforcing sound-absorbing layer (3) A step (b) of laminating a spunbond long-fiber nonwoven fabric (T1), which is an anti-warp layer (6), on a high-strength needlenose short-fiber nonwoven fabric (T2)
c). Bonding the laminate (a) and the laminate (b) prepared in the second step to the upper and lower surfaces of the fabric, which is the core layer (4), in the third step;
d). Heat-resistant polyethylene terephthalate (PET) film of the backing layer 7 is fused to the surface of the layered product (b) bonded to the lower surface of the core layer 4 by flame heating in the fourth step, Forming a urethane foam on a high heat-resistant polyethylene terephthalate (PET) film,
e) In the fifth step, the high heat-resistant polyethylene terephthalate (PET) film of the surface layer 1 is fused with the anti-warp layer 6, which is the surface of the laminate a bonded to the top surface of the center layer 4, And bonding the surface layer (1), which is a film, to the surface layer (1). 6. The method according to claim 5,
A hot-melt layer (not shown) is placed between the anti-warp layer 6, which is the surface of the layered product a bonded to the upper surface of the core layer 4, and the fabric of the skin layer 1, (Step 5-1) of bonding the fabric of the surface layer 1 and the anti-warp layer 2 by bonding the fabric of the surface layer 1 by flame heating to bond the surface layer 1 as a fabric A method for manufacturing an engine cover or an engine undercover for a vehicle.

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