KR102512960B1 - Interior material for trunk of Recreational Vehicle and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an interior material for a trunk of a recreational vehicle (RV) having good shape retention and excellent sound absorption because of its light weight and high strength, and a method for manufacturing the same. 2), it consists of a laminated structure of a sound insulation layer 3 of high-strength board-type nonwoven fabric and a sound absorption layer 4 of conjugate fiber-containing nonwoven fabric.
The interior material for the trunk of a recreational vehicle (RV) of the present invention is lightweight and has high rigidity as a whole, so it is a high-strength material for maintaining high sound absorption and shape to attenuate noise and vibration transmitted to the trunk due to severe vibration noise from the rear wheels of the vehicle. It is particularly suitable as an interior material for a trunk of a recreational vehicle (RV) that requires.

Description

Interior material for trunk of RV vehicle and manufacturing method thereof

The present invention relates to an interior material for a trunk of a recreational vehicle (RV), and more specifically, to an interior material for a trunk of a RV vehicle that is lightweight and has high strength and excellent shape retention, and a method for manufacturing the same.

In general, a car is provided with a trunk for storing various basic maintenance tools necessary for driving by a driver, an auxiliary tire in preparation for a tire puncture, and other items requiring transportation, and the trunk has a side, a lid, and a partition. It consists of a partition, covering, etc., and a trunk trim (interior finishing material that is additionally attached to the inside of the car body) is installed inside each, and the trunk trim absorbs necessary stiffness and noise and vibration. materials are being used.

Unlike interior materials for the trunk of sedan vehicles, interior materials for trunks of RV vehicles (recreational vehicles) generate severe vibration noise from the rear wheels, so materials that dampen them must be used. Noise and vibration cannot be suppressed simply by attaching the plastic material and the sound-absorbing material, and a molded body formed by integrating the plastic material and the sound-absorbing material by deep drawing is used, but excessive noise caused by deep drawing There was a problem that the interior material was twisted after molding due to molding.

In relation to the interior material for the trunk of a vehicle, for example, in Patent Document 1, 2 to 4 sheets are laminated to form a laminated sheet, and the upper and lower surfaces of the laminated sheet are at least one selected from CPP / acrylic / urethane resin. When constituting a sheet for automobile interior materials further comprising a surface coating layer and a backside coating layer by surface coating treatment, the sheet includes a urethane-based TPE and a styrene-based TPE, wherein the urethane-based TPE is an aliphatic isocynate and MI (Melt Index ) is 0.5 to 100 (165 ° C, 2.16 kg), hardness (Shore A) is 75 to 95, specific gravity is 1.11 to 1.28; The styrene-based TPE is a hydrogenated saturated rubber-type block copolymer, and discloses a sheet for automobile interior materials, characterized in that it is at least one selected from the group consisting of SEBS, SEPS, SEBC, and HSBR.

In Patent Document 2, 2 or 3 layers of nonwoven fabric are laminated and a VAM type (vinyl acetate type) resin or MMA type (meta methyl acetate type) resin is formed on the back side of a polyester nonwoven fabric for the surface composed of a single unit by needle punching once. A foam coating layer is formed by foam coating, and low-density polyethylene powder is sprinkled on the foam coating layer to form a powder layer, and nonwoven fabrics made of polyester felt are combined and dried by heat treatment to adhere, or the powder layer is gas-laminated to form a polyester felt. Disclosed is a car trunk and carpet material having excellent integral sound absorption and insulation, air permeability, and compression recovery rate by punching two or three layers of a nonwoven web, characterized in that it is composed by bonding nonwoven fabrics.

Patent Document 3 a) manufacturing a felt layer containing natural fibers and synthetic fibers; and b) forming a coating layer by spraying the polyphenol aqueous solution on one side of the felt layer in step a), wherein the polyphenol aqueous solution in step b) is sprayed within 1 to 5% of the weight of natural fibers in the felt layer. And, after the step b), a method for manufacturing a multi-layer structure for automobile interior materials further comprising laminating a skin layer on the upper surface of the coating layer is disclosed, but the prior art relates to an interior material for a trunk of a recreational vehicle (RV). High strength and shape retention are not problems to be solved.

The inventors of the present invention have completed the present invention by manufacturing an interior material for a trunk of a recreational vehicle (RV) that is lightweight and has high strength and good shape retention.

Patent Document 1; Korean Registered Patent Publication No. 10-1361535 Patent Document 2; Korean Registered Patent Publication No. 10-1425852 Patent Document 3; Korean Registered Patent Publication No. 10-1796511

The problem to be solved by the present invention relates to the provision of an interior material for a trunk of a recreational vehicle (RV) and a method for manufacturing the same, and more particularly, to provide an interior material for a trunk of a recreational vehicle (RV) that is lightweight, has high strength, has good shape retention, and has excellent sound absorption. Its purpose is to provide interior materials for trunks and their manufacturing methods.

As a means of solving the problem for achieving the object of the present invention, an interior material for a trunk of an RV vehicle includes a skin layer (1) made of polyethylene terephthalate (PET) needle nonwoven fabric, a sound absorbing and insulating layer (2) made of sound absorbing and insulating integrated foamed nonwoven fabric, and polyethylene terephthalate (PET). A sound insulation layer (3) made of high-strength board-type nonwoven fabric composed of phthalate (PET) fibers and LM fibers (Low Melting fibers) or RM fibers (Rapid Melting fibers) and conjugate fibers and LM fibers (Low Melting fibers) ) It consists of including a sound-absorbing layer 4 made of a non-woven fabric composed of.

An embodiment of an interior material for a trunk of an RV vehicle according to the present invention includes a skin layer (1) having a weight of 250 g/m2 made of polyethylene terephthalate (PET) needle nonwoven fabric, and an absorber having a weight of 300 g/m2 made of sound absorbing and insulating integrated foamed nonwoven fabric. Sound insulation layer (2), a sound insulation layer (3) having a weight of 300 g/m2 made of high-strength board-type nonwoven fabric composed of polyethylene terephthalate (PET) fiber and LM fiber (Low Melting fiber) or RM fiber (Rapid Melting fiber), and It consists of including a sound-absorbing layer 4 having a weight of 350 g/m2 made of a nonwoven fabric composed of conjugate fibers and LM fibers (Low Melting fibers).

Another embodiment of the interior material for the trunk of an RV vehicle according to the present invention is a skin layer (1) made of 6 to 10 denier PET needle nonwoven fabric, 6 to 10 denier PET fiber and 6 to 10 denier LM fiber or RM fiber A sound absorbing and insulating layer (2) made of a sound-absorbing integrated non-woven fabric made by impregnating and foaming a non-woven fabric composed of acrylic resin or polyethylene terephthalate resin and an expandable foaming agent, and PET fibers of 6 to 10 denier and 6 to 10 denier A sound-absorbing layer (3) made of high-strength board-type nonwoven fabric composed of LM fibers or RM fibers and a sound-absorbing layer (4) made of nonwoven fabric composed of conjugate fibers of 6 to 15 denier and LM fibers of 4 to 10 denier. made by doing

As a solution to another problem of the present invention, a method for manufacturing an interior material for a trunk of an RV vehicle is a), the first step of preparing a 6 to 10 denier polyethylene terephthalate (PET) needle nonwoven fabric having a weight of 250 g / m 2 as a skin layer , b). As a sound absorbing and insulating layer, a nonwoven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers with a weight of 300 g/m2 is expanded with acrylic resin or polyethylene terephthalate (PET) resin. A second step of preparing a sound absorbing and insulating integrated nonwoven fabric impregnated with a foaming liquid and drying the foamed liquid, c). A third step of preparing a high-strength board-type nonwoven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers as a sound insulation layer and d). A fourth step of preparing a nonwoven fabric composed of 6 to 15 denier conjugate fibers and 4 to 10 denier LM fibers having a weight of 350 g/m2 as a sound absorbing layer and e). Layered structure of skin layer (1) / sound absorbing and insulating layer (2) / sound insulating layer (3) / sound absorbing layer (4) by sequentially stacking the materials of each layer prepared in the above steps 1 to 4 and press-molding them to be integrated A fifth step of manufacturing an interior material for a trunk of an RV vehicle having

The LM fiber (Low Melting fiber) or RM fiber (Rapid Melting fiber) according to the present invention is an adhesive fiber of low melting point (110 ~ 200 ℃), polyethylene terephthalate (PET) fiber, polyethylene (PE) fiber, poly Since propylene (PP) fibers and the like are being commercialized, those skilled in the art can easily purchase and apply them to the present invention.

The fifth step according to the present invention is characterized in that the materials of each layer prepared in the first to fourth steps are sequentially laminated, preheated to 200 to 250 ° C, foamed, and integrally molded under pressure.

The interior material of the present invention is an interior material by combining a sound absorbing and insulating layer, which is a sound absorbing and insulating nonwoven fabric layer, a sound absorbing layer (4), which is a nonwoven fabric layer composed of conjugate fibers and LM fibers, and a sound insulation layer (3), which is a high-strength board-type nonwoven fabric layer. As a whole, it is lightweight and has high rigidity, so it is an interior material for the trunk of RV vehicles (Recreational Vehicle), which requires high sound absorption and high-strength material to maintain its shape to attenuate the noise and vibration transmitted to the trunk due to severe vibration noise from the rear wheels of the vehicle. particularly suitable

The interior material for the trunk of an RV vehicle of the present invention effectively blocks vibration and noise of the rear wheels transmitted to the trunk of the RV vehicle, and the overall weight of the interior material is light and shows high stiffness, so the shape retention of the interior material is good and the interior material has good durability. has

1 is a view schematically comparing the structure of an interior material for an RV vehicle trunk of the present invention and the structure of a conventional interior material for a trunk of a passenger car
Figure 2 is a photograph of the trunk trim attached to the inside of the trunk of an RV vehicle

Hereinafter, the present invention will be described in more detail by specific details, examples and test examples for carrying out the invention, but the present invention is not limited by the following description.

An interior material for a trunk of an RV vehicle according to the present invention is a lightweight Luggage Compartment Trim Rear for a trunk of an RV vehicle as shown in FIGS. 1 and 2 .

An interior material for a trunk of an RV vehicle according to the present invention includes a skin layer (1) made of polyethylene terephthalate (PET) needle nonwoven fabric, a sound absorbing and insulating layer (2) made of integrated sound absorbing and insulating foamed nonwoven fabric, polyethylene terephthalate (PET) fibers and LM fibers Sound insulation layer (3) made of high-strength board-type nonwoven fabric composed of (Low Melting fiber) or RM fiber (Rapid Melting fiber) and sound absorption composed of nonwoven fabric composed of conjugate fiber and LM fiber (Low Melting fiber) It consists of including layer (4).

The skin layer 1 according to the present invention is made of a needle nonwoven fabric made of 6 to 10 denier PET fibers, preferably made of a 6 to 10 denier PET nonwoven fabric having a weight of 250 g/m 2 .

The sound absorbing and insulating layer 2 according to the present invention is made of a sound absorbing and insulating integrated foamed nonwoven fabric, and is composed of 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers It consists of an expanded non-woven fabric having a weight of 300 g / m 2 by impregnating a non-woven fabric with an acrylic resin or PET resin and a foaming liquid composed of an expandable foaming agent and foaming.

The sound absorbing and insulating layer 2 has a structure in which the foamed resin layer is formed on both surfaces of the nonwoven fabric, thereby integrating the sound absorbing and insulating properties of the foamed resin layer and the sound absorption of the nonwoven fabric, thereby exhibiting a sound absorbing and insulating function of simultaneously improving sound absorption and sound insulation.

The sound insulation layer 3 according to the present invention is made of a high-strength board-type nonwoven fabric composed of 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers, It is made of non-woven fabric with a weight of 300 g / m 2.

The sound-absorbing layer 4 according to the present invention is made of a nonwoven fabric layer composed of 50 to 80 parts by weight of conjugate fibers of 6 to 15 denier and 20 to 50 parts by weight of LM fibers of 4 to 10 denier, and has a weight of 350 g / m 2 Non-woven fabrics are preferred.

The conjugate fiber of the sound-absorbing layer 4 is a fiber made of one thread by simultaneously spinning two types of polymer stock solutions of different components from one nozzle, and is also called a composite fiber and is commercialized. , polyester resins and polyolefin resins are generally used, and aromatic polyesters such as polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate are used as polyester resins, and butadiene, Copolymers of isoprene, 1,3-pentadiene, styrene, and α-methylstyrene are used.

The conjugate fiber forms torque and crimp throughout the fiber due to the difference in properties according to the elasticity and contractility of the two types of polymer fibers, so that the fiber becomes bulky, light and elastic. It is rich and exhibits moderately stretchable properties.

The manufacturing method of the interior material for the trunk of an RV vehicle of the present invention is a), a first step of preparing a polyethylene terephthalate (PET) needle nonwoven fabric having a weight of 250 g / m 2 and a weight of 6 to 10 denier as the skin layer (1), b). As the sound absorbing and insulating layer (2), a non-woven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers weighing 300 g/m2 is made of acrylic resin or polyethylene terephthalate (PET). A second step of preparing a nonwoven fabric impregnated with a foaming liquid by impregnating with a foaming liquid composed of a resin and an expandable foaming agent and drying it, c). Step 3 of preparing a high-strength board-type nonwoven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers with a weight of 300 g/m2 as the sound insulation layer (3) d) . A fourth step of preparing a nonwoven fabric composed of 6 to 15 denier conjugate fibers and 4 to 10 denier LM fibers having a weight of 350 g/m 2 as the sound absorption layer 4 and e). The materials of each layer prepared in the above steps 1 to 4 are sequentially laminated and integrally molded under preheating and pressure to obtain skin layer (1)/sound absorbing and insulating layer (2)/sound insulating layer (3)/sound absorbing layer (4) It consists of including a fifth step of manufacturing an interior material for a trunk of an RV vehicle having a laminated structure of.

The first step of preparing the skin layer 1 according to the present invention is a carding process, a web forming process, and a web bonding (adhesion) process, which are widely known nonwoven fabric manufacturing methods using PET fiber of 6 to 10 denier as a raw material. It consists of needle punching the non-woven fabric to produce a needle non-woven fabric of 250 g / m 2.

In the second step of preparing the sound absorbing and insulating layer 2 according to the present invention, a nonwoven fabric is prepared with 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers. It consists of preparing a nonwoven fabric impregnated with a foam solution by impregnating it with a foam solution composed of acrylic resin or PET resin and an expandable foaming agent and then drying it at 110 to 140 ° C.

The foaming liquid is composed of 10 to 20 parts by weight of an expandable foaming agent based on 100 parts by weight of an acrylic resin solution or PET resin solution having a solid content of 35 to 45% by weight, the foaming liquid has a foaming temperature of 180 to 200 ° C, and the foam liquid is impregnated. The nonwoven fabric is foamed in the preheating process of the fifth step.

The third step of preparing the sound insulation layer 3 according to the present invention is a nonwoven fabric composed of 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers made by manufacturing

The nonwoven fabric of the sound insulation layer (3) has a relatively high blending amount of LM fibers or RM fibers compared to the amount used for general adhesion, so that it is penetrated into the nonwoven fabric in the molding process, dried, and then made into a high-strength board-type nonwoven fabric. It has the function of enhancing the voice.

The fourth step of preparing the sound-absorbing layer 4 according to the present invention is a nonwoven fabric manufacturing method known to be composed of 50 to 80 parts by weight of conjugate fibers of 6 to 15 denier and 20 to 50 parts by weight of LM fibers of 4 to 10 denier. It consists of manufacturing a non-woven fabric, and a non-woven fabric having a weight of 350 g/m 2 is preferred.

The nonwoven fabric composed of the conjugate fiber and the LM fiber of the sound-absorbing layer 4 functions to improve sound absorption due to the lightness of the conjugate fiber, rich elasticity, and moderately stretchable property.

The fifth step according to the present invention is e). It consists of manufacturing an interior material for a trunk of an RV vehicle by sequentially stacking the materials of each layer prepared in the first to fourth steps and integrally molding them under preheating and pressurization.

The fifth step of the molding process consists of preheating the sequentially laminated materials to 200 to 250 ° C and molding them under pressure with a mold, and by preheating, the nonwoven fabric impregnated with the foamed liquid prepared in the second step is foamed. A sound absorbing and insulating layer is formed to manufacture an interior material for a trunk of an RV vehicle having a laminated structure of skin layer 1/sound absorbing and insulating layer 2/sound insulating layer 3/sound absorbing layer 4.

The interior material for the trunk of an RV vehicle having a laminated structure of the skin layer (1)/sound absorbing and insulating layer (2)/sound insulation layer (3)/sound absorbing layer (4) according to the present invention has a total weight of about 1250 g/m2, and the interior material In the laminated structure, the characteristic structure including the foamed nonwoven fabric layer, the board-type nonwoven fabric layer, and the conjugated nonwoven fabric layer has good sound absorption and insulation, and the overall weight is light and high rigidity, so the shape retention of the interior material is good and the durability is good. has

Hereinafter, the present invention will be described in more detail through specific <Examples> and <Test Examples>.

<Example 1>

- Production of epidermal layer

A needle nonwoven fabric (weight of 250 g/m 2 ) was prepared by carding, cross-lapping, and needle punching 6 denier polyethylene terephthalate (PET) short fibers under the conditions shown in [Table 1] and [Table 2] below.

Carding parameter Cross-lapping parameters Licker-in 600rpm Worker 680rpm Feeding speed 700rpm Stripper 500rpm Upper take off 6000rpm Outlet speed outer 6m/min inner 6.5m/min Preset value 8kg Lower take off 650rpm Layers 22 layers Upper doffer 600rpm Upper table 750rpm Outlet web width 1700mm Lower doffer 800rpm Lower table 750rpm Inlet web width 1800mm

Needle room Needle-punching process conditions Pre-punching (1st) 2nd punching 3rd punching 4th punching Penetration depth(mm) 11 12 13 10 In-let(m/min) 2.6 2.6 2.6 2.6 Stroke(rpm) 600 1,100 850 1,100 Out-let(m/min) 4.5 5 5.8 6.5 Needle density(#/m2) 5000 copies/m 8000 copies/m 8000 copies/m 8000 copies/m Advance/stroke(mm) 13 15 17 17 Draft rate (%) 5 8 7 8

- Production of sound absorbing and insulating layer

70 parts by weight of 6 denier PET fiber and 30 parts by weight of 6 denier RM fiber were carded and cross-wrapped under the above [Table 1] conditions to prepare a nonwoven fabric.

The prepared nonwoven fabric was impregnated with a foaming solution composed of 15 parts by weight of a foaming agent (water-soluble acrylic resin hard type) based on 100 parts by weight of an acrylic resin solution having a solid content of 45% by weight prepared in advance, uniformly through a roller, and then dried in an oven at 150 ° C. to prepare a nonwoven fabric coated with a foaming liquid.

- Production of sound insulation layer

A board-type nonwoven fabric was prepared by carding and cross-lapping with 50 parts by weight of 6 denier PET fiber and 50 parts by weight of 6-10 denier LM fiber under the conditions of [Table 1].

- Production of sound-absorbing layer

80 parts by weight of 15 denier conjugate fibers and 20 parts by weight of 4 denier LM fibers were carded and cross-wrapped under the conditions of [Table 1] to prepare a nonwoven fabric containing conjugate fibers (350 g / m 2 weight).

- Production of interior materials for RV vehicle trunks

Pre-made needle nonwoven fabric, foamed nonwoven fabric, board-type nonwoven fabric, and conjugate fiber-containing nonwoven fabric are sequentially laminated, heated at a preheating temperature of 220 ° C. to foam, and then placed in a lower mold cooled to a temperature of 25 ° C. , and then press-molded with a pressing force of 8Kgf/cm2. As for the pressurization holding time, after maintaining the pressurized state for 1 minute and 30 seconds, the molded body was extracted to manufacture an interior material for the trunk of a RV vehicle.

<Test Example 1>

Specimens of the interior material for RV vehicle trunks prepared in <Example 1> were prepared, and physical properties such as mechanical properties were tested on the specimens, and the results are shown in [Table 3] below.

item unit Example 1 test standard material condition tensile strength kgf/50mm 250 KS K ISO 9073-3 compressive modulus % 135 NES M 7103 smell class 4th grade NES M 0160 wear resistance class 4th grade NES M 7103 combustibility mm/min 80 or less NES M 7103 VOCs ㎍/㎥ less than 20 NES M 402 trunk absorption rate N.R.C. 0.2 or more ISO 354
KS F 2814 - 2 Weight (lightweight ratio) g/m ² (%) Below 1200 (33) NES M 7103 molding condition wear resistance % 3 or more NES M 0154 combustibility mm/min below 95 NES M 0094 tensile strength N over 200 NES M 7103 Molded product sound absorption rate 1kHz α
(Coefficient) 0.2 or higher ISO 354
KS F 2814 - 2 2kHz 0.3 or more 3.15kHz 0.4 or more 5kHz 0.5 or more

As shown in [Table 3], the weight of the interior material for the trunk of an RV vehicle according to the present invention is 1,200 g / m ² The weight of the interior material for the trunk of an RV vehicle of a domestic existing product is 2500 g / m ² (See Drawing 1) It is significantly reduced in weight by about 50% compared to, and these physical characteristics can improve the fuel efficiency improvement effect of 0.7% when the body weight is reduced by 1% in the case of a car. It can be seen that this is a very advantageous aspect commercially.

Claims (5)

A skin layer (1) having a weight of 250 g/m2 made of 6 to 10 denier PET needle nonwoven fabric,
A nonwoven fabric composed of 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers is impregnated with a foaming liquid composed of acrylic resin or polyethylene terephthalate resin and an expandable foaming agent. A sound absorbing and insulating layer (2) having a weight of 300 g / m 2 made of a sound-absorbing integrated non-woven fabric made by foaming and foaming;
A sound insulation layer (3) of 300 g/m2 made of a high-strength board-type nonwoven fabric composed of 50 to 70 parts by weight of 6 to 10 denier PET fibers and 30 to 50 parts by weight of 6 to 10 denier LM fibers or RM fibers, and
A sound-absorbing layer (4) of 350 g / m 2 made of a nonwoven fabric composed of 50 to 80 parts by weight of conjugate fibers of 6 to 15 denier and 20 to 50 parts by weight of LM fibers of 4 to 10 denier RV vehicle, characterized in that it comprises Interior material for the trunk. delete delete delete a), a first step of preparing a 6-10 denier polyethylene terephthalate (PET) needle nonwoven fabric having a weight of 250 g/m2 as the skin layer (1);
b). As the sound absorbing and insulating layer (2), a non-woven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers weighing 300 g/m2 is made of acrylic resin or polyethylene terephthalate (PET). A second step of preparing a nonwoven fabric impregnated with a foaming liquid by impregnating with a foaming liquid composed of a resin and an expandable foaming agent and drying;
c). A third step of preparing a high-strength board-type nonwoven fabric composed of 6 to 10 denier polyethylene terephthalate (PET) fibers and 6 to 10 denier LM fibers or RM fibers with a weight of 300 g / m 2 as the sound insulation layer (3),
d). A fourth step of preparing a nonwoven fabric composed of 6 to 15 denier conjugate fibers and 4 to 10 denier LM fibers having a weight of 350 g / m 2 as the sound absorption layer (4) and
e). The materials of each layer prepared in the above steps 1 to 4 are sequentially laminated and integrally molded under preheating and pressure to form the skin layer (1)/sound absorbing and insulating layer (2)/sound insulating layer (3)/sound absorbing layer (4). An interior material for a trunk of an RV vehicle comprising a fifth step of manufacturing an interior material for a trunk of an RV vehicle having a laminated structure.

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