Molded interior material

Abstract

To provide a molded interior material which is excellent in environmental treatment properties, outer skin peeling resistance and handling properties.SOLUTION: A molded interior material comprises: a core material layer; and a reinforcement layer which is laminated on at least one main surface of the core material layer, where the reinforcement layer includes a nonwoven fabric composed of regenerated cellulose fibers and sheath-core PET fibers.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a molded interior material. [Background technology]

[0002] Many vehicle interior materials use a lightweight and rigid base material, and in particular, molded interior materials used in the ceiling mainly use a structure in which urethane is sandwiched between glass mats. Glass mats are mainstream because they are inexpensive, can be mass-produced, and have high rigidity, but they have environmental issues, such as the generation of minute amounts of arsenic from the waste generated during production, scraps, and product waste generated when scrapping vehicles, and from incineration to treat used products.

[0003] Various efforts have been made to solve such problems. For example, Patent Document 1 discloses a molded interior material in which a skin layer is bonded to the surface of a core layer via a reinforcing layer, with the aim of providing a molded interior material that does not use glass fiber as a reinforcing layer and that does not cause environmental problems when incinerated, characterized in that the reinforcing layer is made of a mixed sheet of carbon fiber and filled fiber, and the surface is formed with unevenness due to graining or wrinkles. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-142251 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, since the molded interior material contains carbon fiber, there are still problems at least with regard to recyclability, etc. Therefore, there is a demand for a molded interior material that can improve environmental treatability while satisfying the physical properties (peeling resistance, handling properties, etc.) required of a molded interior material.

[0006] The present invention has been made in view of the above problems, and has an object to provide a molded interior material that is excellent in environmental treatability, peeling resistance, and handleability. [Means for solving the problem]

[0007] As a result of intensive research into achieving the above-mentioned object, the inventors discovered that the above-mentioned problem could be solved by using a reinforcing layer containing a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers, and thus completed the present invention.

[0008] That is, the present invention is as follows. [1] A core layer and a reinforcing layer laminated on at least one main surface of the core layer, The reinforcing layer includes a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers. Molded interior material. [2] A skin layer is laminated on the opposite side of the reinforcing layer to the core layer. [1] The molded interior material described in the above. [3] The molded interior material according to [1] or [2], wherein the reinforcing layer has a structure in which a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers is impregnated with a thermosetting resin and hardened, and the mass ratio of the thermosetting resin to the nonwoven fabric described above is 0.60 or more and 1.20 or less. [4] The content of the regenerated cellulose fiber relative to the total content of the core-sheath PET fiber and the regenerated cellulose fiber is 5% by mass or more and 20% by mass or less. The molded interior material according to any one of [1] to [3]. [5] The average fiber diameter of the core-sheath PET fiber is 10 μm or more and 14 μm or less. The molded interior material according to any one of [1] to [4]. [6] The average fiber length of the core-sheath PET fiber is 5 mm or more and 10 mm or less. The molded interior material according to any one of [1] to [5]. [7] The nonwoven fabric contained in the reinforcing layer has an air permeability of 200 cc / (cm 2 s) or greater, The molded interior material according to any one of [1] to [6]. [8] The bending elasticity gradient is 70N / cm or more. The molded interior material according to any one of [1] to [7]. [9] Used for car ceiling moldings, The molded interior material according to any one of [1] to [8]. Effect of the Invention

[0009] According to the present invention, it is possible to provide a molded interior material that is excellent in environmental treatability, peeling resistance, and handleability. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram showing a molded interior material according to one aspect of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described (also referred to as "the present embodiment"). Note that the present embodiment is an example for explaining the present invention, and the present invention is not limited to only the present embodiment.

[0012] 1.Molded interior materials The molded interior material of this embodiment has a core layer and a reinforcing layer laminated on at least one main surface of the core layer, and the reinforcing layer contains a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers, and may contain other layers as necessary.

[0013] The specific configuration of the molded interior material will be described below, but the present invention is not particularly limited thereto. Fig. 1 shows one aspect of the molded interior material of this embodiment, and the molded interior material 1 of Fig. 1 has a core layer 21, a reinforcing layer 22, a thermosetting resin 23, a backing material 24 made of nonwoven fabric, and a skin layer 25 in a laminated form. Also, a part of the thermosetting resin 23 may be impregnated into the reinforcing layer 22.

[0014] 1.1.Core layer The core layer 21 is a layer composed of a core material. The core material means a member used in a molded interior material and has at least sound absorption and heat insulation functions. The core material is not particularly limited, but for example, a urethane foam made of a urethane resin foam can be used. As a method for manufacturing the core material, a conventionally known method can be used, and is not particularly limited, but examples thereof include the method described in JP 2013-224104 A, the method described in JP 2019-084910 A, and the method described in JP 2022-029571 A.

[0015] 1.2. Reinforcement layer The reinforcing layer of the present embodiment contains a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers, and may contain other components as necessary.

[0016] 1.2.1.Regenerated cellulose fibers Regenerated cellulose fibers are fibers obtained by dissolving pulp fibers made of cellulose once by chemical reaction and spinning them again. Examples of regenerated cellulose fibers include, but are not limited to, rayon, polynosic, cupra, and lyocell. The use of regenerated cellulose fibers provides excellent peeling resistance and handling. The mechanism is not particularly limited, but is thought to be, for example, as follows. By using regenerated cellulose fibers in combination with core-sheath PET fibers, the degree of bonding between fibers inside the nonwoven fabric, especially between core-sheath PET fibers, is moderately inhibited, and when the nonwoven fabric is impregnated with a thermosetting resin, the nonwoven fabric is uniformly impregnated inside and on the surface. As a result, the strength of the entire reinforcing layer is increased, the peeling resistance is excellent, and at the same time, the resistance (elastic gradient) when bending stress is applied to the reinforcing layer is also improved, leading to excellent handling and a tendency to suppress strength reduction at high temperatures. Here, the "elastic gradient" in this embodiment means the resistance force when bending stress is applied, and unless otherwise specified, it is a concept that includes the elastic gradient in an atmosphere at room temperature and the elastic gradient in an atmosphere at 85°C (hereinafter, also referred to as the elastic gradient (hot)).

[0017] The content of regenerated cellulose fiber relative to the total content of core-sheath PET fiber and regenerated cellulose fiber is preferably 5% by mass or more and 20% by mass or less, more preferably 8% by mass or more and 20% by mass or less, and even more preferably 8% by mass or more and 10% by mass or less. When the content of cellulose fiber relative to the total content of core-sheath PET fiber and regenerated cellulose fiber is 5% by mass or more, the elasticity gradient increases and the handling property tends to improve. When the content is 20% by mass or less, the handling property and surface peeling property tend to be excellent.

[0018] The average fiber length of the regenerated cellulose fiber is preferably 5 mm or more and 10 mm or less. When the average fiber length is 5 mm or more, the peeling resistance tends to be improved. When the average fiber length is 10 mm or less, the texture of the nonwoven fabric tends to be deteriorated and the occurrence of uneven impregnation of the thermosetting resin tends to be suppressed, and as a result, it is considered that the elasticity gradient can be improved. The average fiber length of the regenerated cellulose can be adjusted by using fibers cut to a certain cut length in advance, mixing fibers with different cut lengths, or performing mechanical processing with a device such as a refiner.

[0019] The average fiber diameter of the regenerated cellulose fiber is preferably 0.6 dtx or more and 3.3 dtx or less, more preferably 1.1 dtx or more and 2.2 dtx or less, and even more preferably 1.1 dtx or more and 1.7 dtx or less. By having an average fiber diameter of 1.1 dtx or more, the breathability of the nonwoven fabric is improved, the penetration of the thermosetting resin into the nonwoven fabric proceeds smoothly, and the peeling resistance tends to be further improved. By having an average fiber diameter of 3.3 dtx or less, it tends to be possible to provide a nonwoven fabric with fewer defects such as fiber peeling from the surface of the nonwoven fabric during the production of the nonwoven fabric. The average fiber diameter of the regenerated cellulose can be adjusted by selecting a regenerated cellulose fiber with a single fiber diameter or by mixing and using regenerated cellulose fibers with different fiber diameters.

[0020] 1.2.2.Sheath-core PET fiber The core-sheath PET fiber of this embodiment is a fiber having a structure in which the core is a PET fiber and the sheath is a two-layer structure made of a component having a melting point of 110 to 200°C. The melting point of the PET fiber in the core is preferably 250°C or higher, more preferably 260°C or higher. By using a resin in the sheath that can soften and melt at a lower temperature than the PET in the core, it is possible to improve the handleability and elasticity gradient while maintaining the strength of the molded interior material. In this specification, "PET" is an abbreviation for polyethylene terephthalate.

[0021] As the core-sheath PET fiber, a conventionally known fiber can be used, and a commercially available product may be used, or the fiber may be produced by synthesis.

[0022] The average fiber diameter of the sheath-core PET fiber is preferably 1.1 dtx (10 μm) or more and 2.2 dtx (14 μm) or less, and more preferably 1.65 dtx (12 μm) or more and 2.2 dtx (14 μm). When the sheath-core PET fiber with an average fiber diameter of 1.1 dtx (10 μm) or more and 2.2 dtx (14 μm) or less is used, the thermosetting resin easily penetrates in the surface direction and thickness direction of the nonwoven fabric when impregnated with the thermosetting resin, and as a result, the elasticity gradient tends to be excellent and the peeling resistance tends to be excellent. In addition, the "average fiber diameter" of the sheath-core PET fiber in this embodiment means the weighted average value of all the sheath-core PET fibers when several types of sheath-core PET fibers are mixed, and in the examples, it is simply referred to as "fiber diameter".

[0023] The average fiber length of the sheath-core PET fiber is preferably 5 mm or more and 10 mm or less. By using the sheath-core PET fiber with an average fiber length of 5 mm or more and 10 mm or less, a nonwoven fabric with a uniform texture can be provided, and when the thermosetting resin is impregnated and applied in the process of manufacturing the molded interior material of this embodiment, the resin impregnation in the surface direction tends to be uniform. Note that the average fiber length of the sheath-core PET fiber of this embodiment means the weighted average value of all the sheath-core PET fibers when several types of cut lengths of sheath-core PET fibers are mixed.

[0024] The content of the core-sheath PET fiber relative to the total content of the core-sheath PET fiber and the cellulose fiber is preferably 80% by mass or more and 95% by mass or less, more preferably 80% by mass or more and 92% by mass or less, and even more preferably 90% by mass or more and 92% by mass or less. When the content of the core-sheath PET fiber relative to the total content of the core-sheath PET fiber and the cellulose fiber is 95% by mass or less, the elastic gradient increases and the handleability tends to improve. When the content is 80% by mass or more, it tends to be possible to provide a molded interior material that is more excellent in handleability and surface peelability.

[0025] 1.2.3.Breathability The air permeability of the nonwoven fabric in the reinforcing layer is 200cc / (cm 2 ·s) or more, and 290cc / (cm 2 s) or more, and 340cc / (cm 2 It is more preferable that the air permeability is 200cc / (cm s) or more. 2 By having a permeability of at least 100% by weight (cm2·s), the thermosetting resin is able to penetrate well in the thickness direction of the nonwoven fabric, and the resistance to peeling tends to be further improved. The method for adjusting the air permeability of the nonwoven fabric contained in the reinforcing layer is not particularly limited, but for example, the air permeability can be improved by decreasing the content of cellulose fibers in the nonwoven fabric of the reinforcing layer, and the air permeability can be decreased by increasing the content of cellulose fibers in the nonwoven fabric of the reinforcing layer. In addition, the average fiber diameter of the core-sheath PET fibers and the basis weight of the nonwoven fabric can also be changed. The upper limit of the air permeability of the nonwoven fabric contained in the reinforcing layer is not particularly limited, but may be, for example, 400 cc / (cm2·s) or less.

[0026] 1.2.4.Basic weight The basis weight of the nonwoven fabric in the reinforcing layer is 40 g / m 2 More than 75g / m 2 It is preferable that the thickness is less than 50 g / m 2 More than 70g / m 2 More preferably, it is 50 g / m or less. 2 More than 60g / m 2 It is more preferable that the basis weight of the nonwoven fabric is 40 g / m or less. 2 By setting the nonwoven fabric weight at 75 g / m or more, the molded interior material tends to have an excellent bending elasticity gradient. 2 By satisfying the above condition, the surface peeling resistance tends to be improved.

[0027] Elastic gradient The elasticity gradient of the molded interior material is preferably 70 N / cm or more. The method for adjusting the bending elasticity gradient is not particularly limited, but for example, the elasticity gradient can be increased by increasing the content of the thermosetting resin applied to the nonwoven fabric of the reinforcing layer. The upper limit of the elasticity gradient is not particularly limited, but may be, for example, 120 N / cm, 110 N / cm, or 100 N / cm.

[0028] 1.3.Thermosetting resin The thermosetting resin 23 may be any known material, and is not particularly limited. Examples of the thermosetting resin include isocyanate resin and melamine resin, with isocyanate resin being preferred. The thermosetting resin may be a commercially available product or may be prepared by synthesis. In this embodiment, the thermosetting resin is a concept that includes not only the resin after thermosetting, but also the state of a monomer solution before thermosetting.

[0029] The thermosetting resin 23 is cured by heat press molding. This bonds the core layer 21 and the reinforcing layer 22 together. The thermosetting resin 23 is applied to the core layer 21 and / or the reinforcing layer 22 by a spray, a roll coater, or the like. Although not particularly limited, for example, catalytic water mainly containing amine may be sprayed onto the core layer 21 to promote the curing of the thermosetting resin 23. The thermosetting resin 23 may be applied to only one of the core layer 21 and each fiber reinforcing material 22, or may be applied to both.

[0030] In the molded interior material of this embodiment, the reinforcing layer has a structure in which a nonwoven fabric made of cellulose fibers and core-sheath PET fibers is impregnated with a thermosetting resin and hardened, and from the viewpoint of handling, the mass ratio of the thermosetting resin to the nonwoven fabric is preferably 0.60 or more and 1.20 or less, more preferably 0.70 or more and 1.20 or less, and even more preferably 1.00 or more and 1.20 or less.

[0031] 1.4.Backing material The backing material 24 is not particularly limited, but for example, a nonwoven fabric made of synthetic fibers can be used. Specific examples of synthetic fibers include polyamide, polyester, and polyacrylonitrile. The backing material may be a commercially available product or may be prepared by synthesis. Also, a nonwoven fabric laminated with a film may be used. The film may be a conventionally known film, and is not particularly limited, but for example, polyolefin resin, polyamide resin, and polyester resin may be used.

[0032] 1.5. Epidermal layer The molded interior material preferably has a skin layer 25 laminated on the side of the reinforcing layer 22 opposite to the core layer 21. The skin material constituting the skin layer 25 is not particularly limited, but examples thereof include fabric, cloth, knit, woven fabric, nonwoven fabric, raised cloth, synthetic leather, artificial leather, and genuine leather. These may be used alone or in combination of two or more. The skin material may be used in a state in which it is impregnated with a binder. The binder is not particularly limited, but for example, a commercially available binder may be used, and specific examples thereof include synthetic rubber latex, acrylic emulsion, vinyl acetate emulsion, vinylidene chloride emulsion, and urethane emulsion.

[0033] The molded interior material preferably includes a film between the reinforcing layer 22 and the skin layer 25. This can prevent the thermosetting resin 23 impregnated in the reinforcing layer 22 from seeping out to the surface side of the skin layer 25 of the skin material during heat press molding. As a film material constituting such a film, a conventionally known material can be used, and is not particularly limited, but examples thereof include polyolefin-based resins, polyamide-based resins, and polyester-based resins.

[0034] 2.Applications The molded interior material of the present embodiment can be suitably used as a vehicle interior material, and is not particularly limited, but examples thereof include molded interior materials for automobiles, molded interior materials for ships, and molded interior materials for aircraft. Among these, it is preferably used as a molded interior material for automobiles, and particularly preferably used as a molded ceiling material for automobiles. EXAMPLES

[0035] The molded interior material according to the present embodiment will be described in more detail below using examples and comparative examples, although the present invention is not limited to the following examples.

[0036] 1. Preparation of molded interior materials (Preparation of each Example and Comparative Example) <Example 1> First, a fiber raw material was prepared by mixing Teijin's sheath-core PET fiber (1.1 dtx (10 μm diameter) × 5 mm cut product) as the core-sheath PET fiber and Lenzing's "Tencel" (trade name; the same applies below) as the regenerated cellulose fiber in a mass ratio of 80:20. The mixture was dispersed in water at a concentration of 0.1 mass%, and then wet-laid paper was made using an inclined wire papermaking machine, dried at a dryer temperature of 140°C, and the paper was dried to a basis weight of 55 g / m. 2 We produced nonwoven fabric for use as a reinforcement material. Next, the urethane mat of the core layer was adjusted to a thickness such that the substrate thickness after molding (excluding the surface layer) would be 8.0 mm, and then an aqueous amine solution, which was catalytic water, was applied thereto by a spray method. After applying a thermosetting resin MDI to one side of the core layer of the reinforcing material using a roll coater, the reinforcing material was laminated in the following order: backing material, reinforcing material, core material, reinforcing material, skin material. The laminate was then cut into a size of 300 mm wide x 500 mm long, which was then sandwiched between a metal mold and hot-pressed under high temperature and high pressure conditions to obtain the molded interior material of Example 1. The backing material used was a laminate of spunlace nonwoven fabric made of PET fiber and polyethylene film, and the skin material used was needle-punched nonwoven fabric impregnated with an acrylic binder.

[0037] The molded interior materials of each Example and Comparative Example were produced under the same conditions as in Example 1, except that the core-sheath PET fibers, regenerated cellulose fibers, and application amounts of thermosetting resin were changed as shown in Table 1.

[0038] [Table 1]

[0039] In Table 1, environmental treatability, peel resistance, handleability, elasticity gradient, and elasticity gradient (hot) respectively refer to the environmental treatability of the molded interior material, the peel resistance of the molded interior material, and the handleability of the molded interior material.

[0040] Details of each component shown in Table 1 are as follows. Core-sheath PET fiber 1: Teijin, core-sheath PET fiber, fiber length 5 mm, fiber diameter 1.1 dtx (fiber diameter 10 μm) -Sheath-core PET fiber 2: Teijin, sheath-core PET fiber, fiber length 5 mm, fiber diameter 2.2 dtx (fiber diameter 14 μm) -Sheath-core PET fiber 3: Teijin's sheath-core PET fiber, fiber length 5 mm, fiber diameter 2.2 dtx (fiber diameter 14 μm) and Teijin's sheath-core PET fiber, fiber length 5 mm, fiber diameter 1.1 dtx (fiber diameter 10 μm) were blended in a mass ratio of 50:50. The average fiber diameter was 1.65 dtx (12 μm). Pulp fiber 1: NBKP (coniferous pulp fiber) Regenerated cellulose fiber 1: Lenzing, Tencel, fiber length 4.0 mm, fiber diameter 1.7 dtx (fiber diameter 10 μm) Regenerated cellulose fiber 2: Lenzing, Tencel, fiber length 6.0 mm, fiber diameter 1.7 dtx (fiber diameter 10 μm) Regenerated cellulose fiber 3: Lenzing Co., Ltd., Tencel, fiber length 4.0 mm, fiber diameter 1.7 dtx and Lenzing Co., Ltd., Tencel, fiber length 6.0 mm, fiber diameter 1.7 dtx were blended in a mass ratio of 50:50. The average fiber length was 5.0 mm. Regenerated cellulose fiber 4: Lenzing Tencel, fiber length 6.0 mm, fiber diameter 1.7 dtx. The raw material was beaten in a refiner (beating machine) so that the length-weighted average fiber length was 4.0 mm when measured in accordance with JIS P8226-2:2011 "Pulp - Fiber length measurement method by optical automatic analysis - Part 2: Non-polarized method." Olefin fiber: Yamatobo, polypropylene fiber PZ, fiber length 5mm, fiber diameter 0.8dtx (fiber diameter 9μm) Glass fiber: chopped strand mat Thermosetting resin: Diphenylmethane diisocyanate (MDI)

[0041] In Table 1, "thermosetting resin" means the thermosetting resin applied to the nonwoven fabric of the reinforcing layer, and "resin / substrate" means the mass ratio of the thermosetting resin to the mass of the nonwoven fabric. The basis weight and air permeability of the nonwoven fabric were measured by the following methods. <Basis Weight> The basis weight of the nonwoven fabrics of the Examples and Comparative Examples was measured in accordance with JIS P8124:2011. <Air Permeability> The Frazier air permeability of the nonwoven fabrics of the Examples and Comparative Examples was measured in accordance with JIS L1913:2010 using a breathability tester "KES-8" (manufactured by Kato Tech Co., Ltd.).

[0042] 3. Evaluation 3.1.Environmental treatability Regarding environmental treatability, peeling resistance was evaluated according to the following criteria, and the results are shown in Table 1. [Evaluation Criteria] Good: The reinforcing layer of the molded interior material does not contain glass fiber. ×: The reinforcing layer of the molded interior material contains glass fiber. 3.2. Epidermal peeling test The above test pieces were further cut to a width of 25 mm and a length of 150 mm, and the adhesive strength (N / 25 mm) between the skin layer and the reinforcing layer was measured at a tensile speed of 200 mm / min using a tensile / compression tester manufactured by MinebeaMitsumi Inc. The results are shown in Table 1.

[0043] 3.3. Handling Immediately after removing the thermo-compression molded interior material with dimensions of 300 mm wide x 500 mm long x 8.0 mm thick, the material was subjected to a sensory evaluation in which five skilled artisans moved the molded interior material with both hands to bend it. The handleability was evaluated according to the following rating criteria, and the average score calculated according to the following rating criteria was used to evaluate the handleability. The results are shown in Table 1. [Grading criteria] 4: There is little deflection, so it can be removed from the mold with force. 3: There is little deflection and it can be carefully removed from the mold. 2: The deflection is large and the part deforms when removed from the mold. 1: The molded interior material breaks when removed from the mold. [Evaluation Criteria] 3: The average score is 3.0 or higher. 2: The average score is between 2.0 and 3.0. 1: The average score is less than 2.0.

[0044] 3.4. Elastic gradient The test pieces were further cut to a width of 50 mm and a length of 150 mm, and the three-point bending strength (N / mm) was measured at room temperature (25°C) and at a speed of 50 mm / min using a tensile / compression tester manufactured by MinebeaMitsumi Inc. The results are shown in Table 1.

[0045] 3.5. Elastic gradient (hot) The elasticity gradient was measured according to the measurement method described above for the elasticity gradient, except that the temperature was 85°C. The results are shown in Table 1. This evaluation item evaluates the durability of the molded interior material of this embodiment during actual use, and is preferably 35 N / cm or more. The results are shown in Table 1.

[0046] 4. Discussion Comparing each example with each comparative example, it was found that by using a nonwoven fabric containing regenerated cellulose fiber and core-sheath PET fiber as a reinforcing layer, it is possible to provide a molded interior material that is excellent in environmental treatability, surface peel resistance, and handling properties. Comparing Examples 1 and 2 with Comparative Example 1, it is clear that the inclusion of regenerated cellulose fibers in the nonwoven fabric in the reinforcing layer improves the elasticity gradient and elasticity gradient (hot), improving the handling properties. Comparing Example 1 with Comparative Example 2, it can be seen that by using regenerated cellulose fibers as the cellulose fibers, a nonwoven fabric with excellent breathability can be provided compared to the case where pulp fibers are used, and a molded interior material with excellent peeling resistance can be provided. Comparing Example 1 with Comparative Examples 3 and 4, it is clear that by including core-sheath PET fibers in the nonwoven fabric in the reinforcing layer, it is possible to provide a molded interior material with an excellent elasticity gradient and excellent peeling resistance. A comparison between Example 1 and Comparative Example 5 shows that the molded interior material of the present invention is excellent in environmental treatability. Comparing Examples 3 to 7, it can be seen that the elasticity gradient is excellent when the mass ratio of the thermosetting resin to the nonwoven fabric made of the core-sheath PET fiber and the cellulose fiber is in the range of 0.60 to 1.20, and that the elasticity gradient is even more excellent when the ratio is 1.00 or more. Comparing Examples 1, 4, 8, and 9, it can be seen that by adjusting the cellulose fiber content relative to the total of the core-sheath PET fiber content and the cellulose fiber content to 5 mass% to 20 mass% or less, it is possible to provide a molded interior material with excellent handling, elasticity gradient, and peeling resistance. Comparing Examples 9 to 11 and Examples 12 to 13, it can be seen that by applying a nonwoven fabric containing core-sheath PET fibers having an average fiber diameter of 10 to 14 μm, more preferably 12 to 14 μm, to the reinforcing layer, it is possible to provide a molded interior material with excellent elasticity gradient and peeling resistance. A comparison of Examples 9, 11, and 15 to 19 shows that even when the average fiber length of the regenerated cellulose fiber varies between 4 and 6 mm, by adjusting the average diameter of the core-sheath PET fiber and the amount of regenerated cellulose fiber, it is possible to provide molded interior materials with excellent handling, elasticity gradient, and peeling resistance. [Industrial Applicability]

[0047] INDUSTRIAL APPLICABILITY The present invention has industrial applicability since it can be widely used for molded interior materials for automobiles, ships, aircraft, and the like. [Explanation of symbols]

[0048] 1...molded interior material, 21...core material layer, 22...reinforcing layer, 23...thermosetting resin, 24...backing material, 25...skin layer.

Claims

1. A core layer and a reinforcing layer laminated on at least one main surface of the core layer, The reinforcing layer includes a nonwoven fabric made of regenerated cellulose fibers and core-sheath PET fibers. Molded interior material.

2. A skin layer is laminated on the opposite side of the reinforcing layer to the core layer. The molded interior material according to claim 1.

3. The reinforcing layer has a structure in which the nonwoven fabric is impregnated with a thermosetting resin and cured, and a mass ratio of the thermosetting resin to the nonwoven fabric is 0.60 or more and 1.20 or less. The molded interior material according to claim 1.

4. The content of the regenerated cellulose fiber relative to the total content of the core-sheath PET fiber and the content of the regenerated cellulose fiber is 5.0% by mass or more and 20% by mass or less. The molded interior material according to claim 1.

5. The average fiber diameter of the core-sheath PET fiber is 10 μm or more and 14 μm or less. The molded interior material according to claim 1.

6. The average fiber length of the core-sheath PET fiber is 5 mm or more and 10 mm or less. The molded interior material according to claim 1.

7. The air permeability of the nonwoven fabric contained in the reinforcing layer is 200 cc / (cm ２ s) or more; The molded interior material according to claim 1.

8. The bending elasticity gradient is 70 N / cm or more. The molded interior material according to claim 1.

9. Used for car ceiling moldings, The molded interior material according to any one of claims 1 to 8.

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