KR20110123615A - Elastic parts for motor interior and method of fabricating the same - Google Patents

Abstract

PURPOSE: A vehicle interior elastic component and a manufacturing method thereof are provided to offering excellent elasticity and durability while offering soft touch sense and to reduce manufacturing costs. CONSTITUTION: A skin layer is formed(S100). The surface of the skin layer is formed into engineering plastic, synthetic fiber, wood, or leather. Simple fiber hybrid is formed by mixing hollow polyester fiber, composite fiber, stretch fiber, and thermally fused binder polyester fiber. The simple fiber hybrid is carded and is manufactured with a web. Elastic non-woven fabric is formed through a thermal process and a cooling process of the web. The thickness of the elastic non-woven fabric is from 2mm to 20nm. A cushioning layer is formed(S200). The skin layer and the cushioning layer are combined(S300).

Description

ELASTIC PARTS FOR MOTOR INTERIOR AND METHOD OF FABRICATING THE SAME}

The present invention relates to a vehicle interior elastic component and its manufacturing method.

In general, the most widely used cushioning material used in everyday life is a polyurethane foam (commonly referred to as "sponge"), and is widely used due to its advantages of being light, elastic, and inexpensive. However, polyurethane foams with a sparse foam of polyurethane resin have a peculiar smell, yellowing phenomenon occurs over time, elasticity decreases due to corrosion of the foam cell itself, dust is generated, and recycling is difficult. there was.

Therefore, a great deal of attention is being paid to the material to replace the polyurethane foam, but the situation that the material showing a satisfactory effect has not been presented.

Thus, Korean Patent Publication No. 1990-8073 discloses a fiber-forming polymer having a melting point of 100 ° C.-220 ° C., having one or more hollows continuous to the fiber axis, and having a hollow ratio of 5-80%, after stretching. Heat-adhesive fibers with single yarn fineness of 0.5-30 denier, 3-40 sheets / inch of crimp, and 10-150 mm of fiber length have been proposed, but lack of elasticity and poor strength due to low strength of the fiber itself. There is this.

In addition, Korean Patent Invention No. 908340 discloses 10 to 70% by weight of polyester conjugate fiber, 10 to 70% by weight of polyester conjugate fiber surface-treated with oil containing silicon, It is composed of 10 to 70% by weight of low melting point heat-sealing binder fiber and 10 to 70% by weight of the sheath type composite fusion fiber made of polyester or polystyrene, and each web is mixed and carded to laminate a web in a single layer or multiple layers. Next, the laminated web is bonded by needle punching using a needle with a barb to form a sheet, and the sheet is passed through a dry box and a heating roller to be fusion bonded. Although a highly elastic nonwoven fabric has been proposed, it is produced by mixing webs by mixing two kinds of conjugate fibers and heat-sealed binder fibers to produce a nonwoven fabric. Greater possibility degrees repeat durability of the elastic structure is dropped during use to be elastic and resilient recovery degraded away, the touch feeling of greater concern is different from the polyurethane foam surface.

In addition, Korean Patent Publication No. 2008-80144 discloses a molded article obtained by thermoforming a fibrous spherical body in a mold, wherein the fibrous spherical body has a melting point of at least 40 ° C lower than the melting point of (a) the inelastic polyester and the inelastic polyester. A composite short fiber in which an elastic thermoplastic elastomer having a compound is disposed, wherein the inelastic polyester is exposed so that 25% to 49% of the surface of the composite short fiber is formed, and (b) a polytrimethylene terephthalate-based short fiber Although a molded article consisting of a highly elastic fiber spherical body has been proposed, wherein a part of its fiber entanglement is thermally fixed at a flexible hot-bonding point, special equipment for forming the spherical body is required, resulting in an increase in manufacturing cost. do.

In addition, when the nonwoven fabric is simply laminated with a conventional short-fiber fiber, and heat-treated, and taken out of the mold, the surface touch of the nonwoven fabric has a hard disadvantage.

In particular, the elastic part as a vehicle interior material can be used as a binder to integrate the surface and the base material, to provide a soft property to improve the emotional quality, improve the product quality, to protect the driver and passengers in the event of a collision, and to integrate the surface and the substrate. In order to increase the applicability and economical efficiency than the existing urethane or double laselle, it is possible to manufacture using the existing nonwoven fabric equipment to the maximum, and to develop a material having excellent resilience and durability.

In order to solve the above problems, an object of the present invention is to provide a resilient automotive interior parts and a manufacturing method thereof that are excellent in resilience and durability while showing a soft touch and a soft touch.

The present invention to achieve the above object is a skin layer forming a surface of engineering plastics, synthetic fibers, wood or leather; And 5 to 80% by weight of a hollow polyester fiber having a porosity of 20 to 60%, a stretch fiber comprising a composite fiber comprising a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having a viscosity of 0.45 to 0.56. It provides an elastic part for a vehicle interior comprising a; cushion layer made of a non-woven fabric containing 80% by weight and 5 to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃.

In another aspect, the present invention provides a vehicle interior elastic component is a fiber selected from the group consisting of the side-by-side type, sheath-core type, eccentric sheath-core type.

In another aspect, the present invention provides a vehicle interior elastic component is a side-by-side type of stretch fiber made of polytriethylene terephthalate having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate having an intrinsic viscosity of 0.45 to 0.56.

In another aspect, the present invention provides the automotive interior elastic component is the heat-sealed binder polyester fiber is a hollow heat-sealed binder polyester fiber.

In addition, the present invention is the hollow polyester fiber is strength 2 ~ 5g / d, elongation 30 ~ 60%, compression ratio 10 ~ 50%, compression recovery rate 80 ~ 100%, the polyester stretch fiber is 2 ~ 5g / strength d, 40 to 80% elongation, 10 to 15 crimps, 14 to 20 crimping rate, 2 to 10% shrinkage, 20 to 90 mm long filament, the heat-sealed polyester fiber has a strength of 2 to 5 g / d, elongation It provides elastic parts for automobile interiors with 20 ~ 60%, 5 ~ 15 crimps, 10 ~ 20 crimps and 2 ~ 8% shrinkage.

In addition, the present invention, the hollow polyester fiber is 4 to 15 denier in thickness, the polyester stretch fiber is 2 to 9 denier, the heat-sealing binder polyester fiber is 2 to 10 denier elastic for automobile interior Provide parts.

In another aspect, the present invention provides a vehicle interior elastic component wherein the nonwoven fabric is a short fiber heat-sealed nonwoven fabric.

In another aspect, the present invention provides a vehicle interior elastic component having a thickness of 2 ~ 20mm.

In another aspect, the present invention provides the vehicle interior elastic component is used for the door trim or crash pad.

In another aspect, the present invention provides a skin layer forming step of forming a surface to meet the required form of engineering plastics, synthetic fibers, wood or leather; 5 to 80% by weight of hollow polyester fiber having a 20% to 60% hollow fiber, a polyester fiber having an intrinsic viscosity of 0.63 to 1.30, and a stretch fiber comprising a composite fiber comprising a polyester polymer having an intrinsic viscosity of 0.45 to 0.56 80% by weight and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C. are mixed to form a short fiber mixture, and the web is manufactured by forming the web by carding the short fiber mixture to 80 to 200 ° C. A cushion layer forming step of forming an elastic nonwoven fabric formed by heat treatment and cooling at a desired shape; And a combining step of integrating the skin layer and the cushion layer.

The present invention also provides a vehicle interior elastic component manufactured by the above method.

In another aspect, the present invention provides a door trim including the above-described vehicle interior elastic component or the vehicle interior elastic component manufactured by the above method.

In another aspect, the present invention provides a crash pad comprising the above-described vehicle interior elastic component or the vehicle interior elastic component manufactured by the above method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

Car interior elastic parts of the present invention is a skin layer forming a surface of engineering plastics, synthetic fibers, wood or leather; And 5 to 80% by weight of hollow polyester fiber having a porosity of 20 to 60%, a stretch fiber comprising a composite fiber comprising a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having an intrinsic viscosity of 0.45 to 0.56. Cushion layer made of a non-woven fabric containing 80% by weight and 5 to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃; may include, the hollow polyester fibers, binder polyester fibers and stretch fibers Features that can control the degree of elasticity required depending on the mixing ratio can be expressed.

Skin layer of the present invention is a part that forms the surface according to the form required for the vehicle interior materials, the construction method and the application material is selected according to the grade (grade) for each vehicle type is given color and grain (consumption) of the consumer showing comfort and comfort It serves to satisfy the emotion. Engineering plastics constituting such a skin layer may be used, such as PVC, ABS, TPO, TPU, PC, PP, and the like, synthetic fibers are not limited to polyester, nylon, PVC, and the like. Leather may also be used in various ways, such as artificial leather, natural leather.

The cushioning layers of the present invention are all composed of polyester-based fibers, and are also used in the past because they are thermally bonded by low melting point heat-sealed binder fibers in the fiber structure without the use of an adhesive containing a separate organic solvent or the like. The unique smell of the polyurethane foam, the yellowing phenomenon occurs over time, and the elasticity of the foam cell itself is reduced due to the corrosion of the foam cell, it is not only to compensate for the disadvantages of the polyurethane foam, such as problems that are difficult to recycle. However, there are environmentally friendly effects with similar or superior elasticity, form stability and chemical stability compared to polyurethane foams.

Specifically, the hollow polyester fiber having a hollow ratio of 20 to 60% is capable of producing a lighter product than a product that does not include hollow fiber due to the hollow in the fiber, and serves to exhibit high elasticity. It is produced by spinning using 2 ~ 6 leaf hollow block and mainly uses 3 leaf hollow block. The hollow ratio can be calculated according to the following formula.

Hollow rate (%) = cross section of hollow part / shear area of fiber (including hollow section) 단면 100

The hollow polyester fiber of the present invention has a hollow ratio of 20 to 60%, preferably 30 to 40%. If the porosity is less than 20%, the size of the fiber cross-section is large, the elasticity is low, there is a fear that the cushioning properties are not exhibited high. There is a problem. Hollow polyester fiber of the present invention is good to express the elasticity while maintaining the strength required to be 2 ~ 5g / d, 30 ~ 60% elongation, 10 ~ 50% compression rate, 80 ~ 100% compression recovery rate.

In addition, the stretch fiber comprising a composite fiber made of a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having an intrinsic viscosity of 0.45 to 0.56 serves to exhibit elastic modulus and compressive recovery. It may be a side-by-side type, sheath-core type, eccentric sheath-core type. Preferably, the side by side type stretch fiber composed of polytrimethylene terephthalate (PTT) having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate (PET) having an intrinsic viscosity of 0.45 to 0.56 may exhibit high elasticity. The composite fiber form having the viscosity of the two forms may be excellent in elasticity because the different properties of the polymer having each of the viscosity appears according to the difference in viscosity. If it is out of the above range, the stability in the spin pack is lowered, so that the bonding strength between the polymer is bad or the spinning workability is poor due to the bending of the polymer due to the melt viscosity difference during spinning, so that the viscosity range of each polymer constituting the fiber to be maintained It is important to maintain compatibility with each other. The stretch fiber of the present invention exhibits excellent elasticity of 2 to 5 g / d, 40 to 80% elongation, 10 to 15 crimps, 14 to 20 crimps, 2 to 10% shrinkage, and 20 to 90 mm long fiber. good.

In addition, the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃ to maintain the shape stability by bonding between fibers at low temperatures, similar to the heat treatment at a low temperature than conventional polyester of about 250 ℃ It has physical properties and can be subjected to low temperature heat treatment, thereby reducing the heat treatment cost for fusion. If the melting point is less than 110 ℃, there is a fear that the heat resistance during the manufacturing of the product is lowered, if it exceeds 180 ℃ there is no effect of reducing the heat treatment cost. On the other hand, the present invention may be used as the heat-sealing binder polyester fiber, a hollow heat-sealing binder polyester fiber, the hollow fiber having a melting rate of 110 ~ 180 ℃ and 5 to 50% Compared with the existing heat-adhesive fiber, the additional effect contributes to the weight reduction due to the hollow effect inside the yarn even after heat sealing. Heat-sealed polyester fiber of the present invention has a strength of 2 ~ 5g / d, 20 ~ 60% elongation, 5 ~ 15 crimps, 10 ~ 20 crimping, 2 ~ 8% shrinkage to maintain morphological stability when manufacturing the product It is good to show light weight, soft touch.

In addition, the present invention is the thickness of the hollow polyester fiber 4 ~ 15 Denier, the polyester-based stretch fibers are 2 to 9 denier, the heat-sealing binder polyester fibers are 2 to 10 denier is good elasticity and strength of the final product, showing a soft touch, the cushion layer of the present invention When the thickness of the constituting fibers is less than the above range, respectively, the strength and elongation of the fiber is low, and when the thickness exceeds the above range, the weight becomes too large and the surface touch may be rough when manufactured as a final product.

On the other hand, the cushion layer constituting the elastic part for interior of the vehicle of the present invention is 5 to 80% by weight of hollow polyester fibers, 5 to 80% by weight of polyester stretch fibers and 5 to 80% by weight of the heat-sealing binder polyester fibers It is good to have the soft touch and elasticity, strength, and durability. If the hollow polyester fiber is less than 5% by weight, the weight of the final product may be too high. If the content is less than 5% by weight, the elastic expression is lowered. If the heat-sealed binder polyester fiber is less than 5% by weight, the binding force of the final product is weakened, resulting in a decrease in strength. On the other hand, if the hollow polyester-based fiber exceeds 80% by weight, the compressive permanent shrinkage of the final product may be lowered, and if the polyester-based stretch fiber exceeds 80% by weight of the fiber structure due to shrinkage of the fiber (fiber) If the density rises and the strength is stronger than elasticity, the touch may be rough, and if the heat-sealing binder polyester fiber exceeds 80% by weight The repulsive elasticity is lowered and the touch of the cushion layer hardens, which may result in poor touch.

In the final physical properties, products having a repetitive extrusion reduction ratio of 80% or less, preferably 10 to 80% or repulsive elasticity of 55% or more, preferably 55 to 90% are excellent in elasticity and excellent in maintaining excellent elasticity for a long time. . Beyond the above range, there is a disadvantage in that the shape deformation and rebound elasticity degradation phenomenon due to repeated compression occurs.

Therefore, it is good to use the ratio of each fiber within the said range according to a use for the required physical property.

The cushion layer of the present invention is a short-fiber heat-sealed nonwoven fabric made of a blending ratio of the hollow polyester fiber, polyester stretch fiber, and heat-sealed binder polyester-based fiber to suit the purpose, and is easily used as a conventional nonwoven fabric manufacturing facility. It is manufacturable and suitable for a variety of applications where elasticity is required. The thickness of the nonwoven fabric is 2 to 20 mm, preferably 3 to 10 mm, which is good for showing elasticity and cushioning properties. If the thickness is less than 2 mm, the thickness of the nonwoven fabric may be thin so that the expression of the elastic effect may be weakened when pressed by hand. If it exceeds, heat transfer to the inside during the heat treatment of the non-woven fabric is difficult to reduce the shape stability, and when applied as a vehicle interior parts, when combined with the skin layer is completed, the thickness of the cushion layer is too thick, the appearance of the skin layer is likely to be poor. There is.

1 is a manufacturing process diagram of a vehicle interior elastic component according to an embodiment of the present invention. Referring to FIG. 1, the automotive interior elastic component of the present invention may be manufactured including a skin layer forming step S100, a cushion layer forming step S200, and a combination step S300. The elastic component for automobile interior of the present invention is easy to manufacture the nonwoven fabric by controlling the fiber mixing ratio and heat treatment temperature without using a new device, and by manufacturing a cushion layer using a conventional nonwoven fabric manufacturing apparatus, it is possible to reduce the cost.

Specifically, the skin layer forming step S100 is selected in the construction method and application material according to the grade (grade) according to the grade required to meet the form required by engineering plastics, synthetic fibers, wood or leather surface shape, color, grain (grain) ) To achieve the shape and the like. For example, PSM (Powder Slush Molding), Vacuum Forming, Spray, RIM (Reaction Injection Molding), LVF (Laminating Vacuum Form), LIM (Laminate Insert Molding), Leather Wrapping method (Leather Wrapping) may be applied, but is not limited thereto.

In the cushion layer forming step S200, a composite fiber composed of a polyester polymer having an intrinsic viscosity of 0.450 to 0.560 and a polyester polymer having an intrinsic viscosity of 0.43 to 1.60 is 5 to 80% by weight of a hollow polyester fiber having a porosity of 20 to 60%. To prepare a short-fiber mixture containing 5 to 80% by weight of the stretch fiber and 5 to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃ by adjusting the mixing ratio to meet the required physical properties, After the carding step of manufacturing the fiber mixture as a web, the short fiber mixture subjected to the carding step is heat-treated at 80 ~ 200 ℃, the heat treatment is a heat treatment in a conveyor belt method with hot air at the temperature, and the heat treatment again in the final roller It is good to proceed to the heat treatment step, the temperature is good to maintain the touch without lowering the physical properties of each fiber, hot air is produced Does not break the form of the can to uniform drying to occur. Then, by cooling the heat-treated short fiber mixture proceeds to the cooling step is made with an elastic nonwoven fabric it can be completed by the cushion layer.

Subsequently, a vehicle interior elastic component may be manufactured through a combination step of integrating the skin layer and the cushion layer formed as described above, and a separate process may be added according to the use in addition to the above steps.

If the elastic parts for the interior of the vehicle manufactured as described above can be applied anywhere as the interior portion of the vehicle is required to elasticity, in particular, it is good to be applied to the crash pad or door trim, and is not limited to the interior of the vehicle.

As described above, the vehicle interior elastic component of the present invention includes a cushion layer including a skin layer and hollow polyester fiber, polyester stretch fiber, and heat-sealing binder polyester fiber satisfying user-based sensitivity. Lightweight and soft touch, yet excellent in elasticity and durability.

In addition, by varying the mixing ratio of the fibers constituting the cushion layer of the vehicle interior elastic component of the present invention, it is easy to adjust so as to exhibit various characteristics of each fiber, there is an effect that can be applied to various applications required. .

In addition, the automotive interior elastic component of the present invention is not only possible to configure a variety of skin layer material, but also cushion layer is composed of all polyester-based fibers, low melting point heat-sealed binder fibers in the fiber structure without using any adhesive when bonding between fibers Since it is thermally bonded by, it has a similar or superior elasticity compared to the conventional polyurethane foam, but also exhibits form stability and chemical stability and has an environmentally friendly effect.

In addition, the method of the present invention is easy to manufacture non-woven fabrics by using the existing apparatus and there is a cost saving effect.

The automotive interior elastic component of the present invention has a good effect to be applied to a door trim or a crash pad, which is a vehicle interior material.

1 is a manufacturing process diagram of the vehicle interior elastic component according to an embodiment of the present invention.
Figure 2 is a schematic diagram of the measuring device for the elastic sample of the present invention (a) permanent compression rate measuring machine, (b) rebound elasticity measuring machine.

Through the following examples will be described in more detail.

Preparation Example 1

Hollow Poly 34%, Fineness 8.0 Denier, Strength 3.3g / d, Elongation 51%, Compression 46%, Compression Recovery 91%, Hollow 30%, Hollow Polyethylene Terephthalate (PET) Fiber 64mm Fiber (Fiber A) 45 PolyTrimethylene Terephthalate (PTT) with weight%, fineness 2.5 denier, strength 2.8 g / d, elongation 105%, crimp elongation 52%, recovery rate 32%, shrinkage 96%, fiber length 64mm, intrinsic viscosity 0.95 45% by weight of side by side type stretch fiber (fiber B) made of polyethylene terephthalate (PET) having an intrinsic viscosity of 0.52, fineness 4.4 denier, strength 3.6 g / d, elongation 40%, crimping water 9.4, crimping Figure 16.5, shrinkage rate of 6.4%, filament length 64mm heat-sealing binder polyethylene terephthalate fiber (fiber C) by mixing 10% by weight to form a short fiber mixture and mixing in a carding machine, the carding step of manufacturing the mixture into a web After this, it is conveyed by 170 ℃ hot air After the heat treatment by the ear belt method, and further heat treatment on the final roller at 150 ℃ and cooled at room temperature to prepare a non-woven fabric of 6mm thickness and weight 165 g / m ² .

Comparative Production Example 1

Fiber A was carried out in the same manner as in Preparation Example 1 except that 4% by weight, fiber B was 11% by weight, and fiber C was 85% by weight.

* Test Methods

1) Compression permanent reduction rate (room temperature and 70 ℃)

The test piece was made in a square of 50 mm or more in length and 20 mm or more in thickness, and was compressed and fixed to 50% of the thickness of the test piece with a compression plate, and maintained for 22 hours in a constant temperature or 70 ° C constant temperature bath. After leaving for 30 minutes at room temperature, the thickness was measured and calculated by the following equation.

C = ( t ₀ - t ₁ ) / t ₀ × 100

C: permanent compression rate (%)

t ₀ and t ₁ : Thickness of test piece before and after test (mm)

2) resilience

The test piece was made into a square with a side length of 50 mm or more and a thickness of 50 mm or more. A steel ball with a weight of 16 g and a diameter of 16 mm was dropped on the test piece at a height of 500 mm, and the maximum rebound height was measured. At least three times or more of rebound values were measured continuously, and the median value was made into the rebound elastic value (%).

2 is a schematic diagram of a measuring device for an elastic sample of the present invention, showing (a) a permanent compression rate measuring machine and (b) a rebound elasticity measuring machine.

3) Air resistance (Air permeability)

As a measurement standard, ASTM F778-88 or JIS P 8117 (average twice) was used, but in the present invention, JIS P 8117 (average twice) was used.

In the measurement method, first measure the thickness of the sample twice to find the average value (unit: mm), and then prepare the specimen in the size of 2.5cm × 2.5cm. The prepared dry sample is mounted on an automated permporometer (manufacturer: Porous Materials Inc.), model name: CFP-1200-AEL, and connected to an air inlet line. do.

After that, click Execute autotest button in the main menu of the computer program connected to the device, and click show advanced settings. Enter the file location, name, sample name, and sample thickness. Select air permeametry from the test type and start the test. When the report is finished after the analysis, select the coefficients to be expressed in the permeability test report (Darcy, Gurley, Frazier, Rayl), and then report the Gurley method (JIS P 8117). ) The average value of two times is described.

 Calculation

4) Emotional Evaluation

The softness was evaluated by pressing the nonwoven surface.

division Preparation Example 1 Comparative Production Example 1 Fiber A (% by weight) 45 4 Fiber B (% by weight) 45 11 Fiber C (% by weight) 10 85 Nonwoven Thickness (mm) 6 6 Final heat treatment temperature (℃) 150 150 Permanent compression
(70 ℃,%) 57 30 Resilience (%) 65 20 Air resistance (sec / 100ℓ) 0.19 0.45 Weight (g / m ² ) 165 275 Emotional Evaluation
Nonwoven surface pressed Softness crustiness

 As a result of Table 1, when the ratio of the hollow PET fiber is increased, the overall weight is reduced and the air resistance is low (good air permeation). In addition, it was confirmed that the elastic modulus is improved when the ratio of the stretch yarn is increased, and the shape stability is increased when the ratio of the heat-sealed binder fiber is increased.

In addition, Production Example 1 exhibited better elasticity than Comparative Production Example 1, and it was confirmed that in Production Example 1, the effect was more excellent in terms of soft touch.

With the preparation example 1 and Comparative Preparation Example 1 prepared as described above was applied to the crash pad and the door trim as a vehicle interior parts to evaluate the cushioning of the surface.

Example 1

A skin pad was made of natural cowhide leather, a cushion layer was prepared in Preparation Example 1, and a core layer was formed by injection molding using polypropylene (PP) to prepare a crash pad in a conventional manner.

Example 2

The door trim was manufactured by a conventional method such that a skin layer was coated with a natural cowhide leather on the outside of the door panel, and a pad, which is a cushion layer, was prepared in the inside of the door panel in Preparation Example 1.

Comparative Example 1

The skin layer was made of natural cowhide, the cushion layer was made of Comparative Production Example 1, and the core layer was made of polypropylene (PP) to prepare a crash pad in a conventional manner.

Comparative Example 2

The door trim was manufactured by a conventional method such that a skin layer was coated with a natural cowhide leather on the outside of the door panel, and a pad, which is a cushion layer, was prepared in Comparative Example 1 on the inner side of the door panel.

As a result of applying the nonwoven fabrics of Preparation Example 1 and Comparative Example 1 to the crash pad and the door trim of the vehicle, respectively, Example 1 and 2 showed excellent cushioning and shock buffer by the sensitivity evaluation of pressing the skin layer compared to Comparative Examples 1 and 2, respectively. It was confirmed that the sex.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (13)

Skin layers surfaced with engineering plastics, synthetic fibers, wood or leather; And
Stretch fiber 5 to 80 comprising a composite fiber composed of 5 to 80% by weight of a hollow polyester fiber having a porosity of 20 to 60%, a polyester polymer having an intrinsic viscosity of 0.63 to 1.30, and a polyester polymer having a viscosity of 0.45 to 0.56. A cushion layer made of a nonwoven fabric comprising 5% by weight to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C;
Vehicle interior elastic parts comprising a. The method of claim 1,
The composite fiber is a vehicle interior elastic component is a fiber selected from the group consisting of side-by-side type, sheath-core type, eccentric sheath-core type. The method of claim 1,
The stretch fiber is a side-by-side type of stretch fiber made of polytriethylene terephthalate having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate having an intrinsic viscosity of 0.45 to 0.56. The method of claim 1,
The heat-sealed binder polyester-based fiber is a hollow heat-sealed binder polyester fiber is an automotive interior elastic component. The method of claim 1,
The hollow polyester fiber has a strength of 2 ~ 5g / d, elongation 30 ~ 60%, compression rate 10 ~ 50%, compression recovery 80 ~ 100%, the polyester stretch fiber has a strength of 2 ~ 5g / d, elongation 40 ~ 80%, 10-15 crimps, 14-20 shrinkage, 2-10% shrinkage, 20-90mm fiber length, the heat-sealed polyester fiber has a strength of 2-5g / d, elongation 20-60% , Automotive parts with 5 to 15 crimps, 10 to 20 crimps and 2 to 8% shrinkage. The method of claim 1,
The hollow polyester fiber has a thickness of 4 to 15 denier, the polyester stretch fiber is 2 to 9 denier, the heat-sealing binder polyester fiber is 2 to 10 denier. The method of claim 1,
The nonwoven fabric is a short-fiber heat-sealed nonwoven fabric vehicle interior elastic parts. The method of claim 7, wherein
The nonwoven fabric has a thickness of 2 ~ 20mm vehicle interior elastic parts. The method according to any one of claims 1 to 9,
The vehicle interior elastic component is a vehicle interior elastic component used for the door trim or crash pad. Skin layer forming step of forming a surface to meet the required form of engineering plastics, synthetic fibers, wood or leather;
5 to 80% by weight of hollow polyester fiber having a 20% to 60% hollow fiber, a polyester fiber having an intrinsic viscosity of 0.63 to 1.30, and a stretch fiber comprising a composite fiber comprising a polyester polymer having an intrinsic viscosity of 0.45 to 0.56 80% by weight and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C. are mixed to form a short fiber mixture, and the web is manufactured by forming the web by carding the short fiber mixture to 80 to 200 ° C. A cushion layer forming step of forming an elastic nonwoven fabric formed by heat treatment and cooling at a desired shape; And
Combining the skin layer with the cushion layer;
Method of manufacturing a vehicle interior elastic component comprising a. An automotive interior elastic component manufactured by the method of claim 10. A door trim comprising a vehicle interior elastic component according to any one of claims 1 to 9 or a vehicle interior elastic component manufactured by the method of claim 10. 10. A crash pad comprising the automotive interior elastic component of claim 1 or the automotive interior elastic component manufactured by the method of claim 10.

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