JP4626969B2 - Vehicle interior material with excellent sound absorption performance - Google Patents

Description

  The present invention relates to a vehicular interior material used for a ceiling or the like of an automobile, and more particularly to a vehicular interior material having a desired air permeability and excellent sound absorption performance.

  Conventionally, automobile interior materials having various configurations are known, for example, having a structure comprising a cushioned skin material / multilayer film / base material, and the high melting point resin layer of the multilayer film is used as an air permeation blocking layer. (For example, see Patent Document 1), interior material (for example, see Patent Document 2) composed of a skin material / base material / back surface material (hot melt + non-breathable film), and further acts as an adhesive and blocks air flow. A hot melt film functioning as a layer and an apparent density higher than that of a normal nonwoven fabric and a combination with a specific nonwoven fabric excellent in moldability (for example, see Patent Document 3) have been proposed.

On the other hand, some sound absorbing materials have a structure in which a sheet having a hole in the surface layer is disposed to increase the sound absorption rate of the low frequency band sound. (For example, see Patent Document 4)
Japanese Patent Laid-Open No. 7-117571 Japanese Utility Model Publication No. 5-65532 JP 2001-322193 A Japanese Patent Laid-Open No. 4-9899

  However, in the former two related to the vehicle interior material, the sound from the indoor side is reflected by the air permeation blocking layer to impair the sound absorbing function as the interior material, or abnormal noise due to friction is generated by the vibration of the vehicle and There is a problem such as giving unpleasant feeling, and in the combination of hot melt film and non-woven fabric, the hot melt film plays a role as a ventilation barrier, so it is close to sound insulation, and there is a feeling that sound absorption performance is slightly insufficient. Yes, the issue of air permeability and sound absorption performance is not considered. On the other hand, the conventional sound-absorbing material has a certain effect on sound-absorbing performance, but mainly prevents water and oil from penetrating into felts such as oil, light oil, and gasoline, and is used for interior materials such as automobile ceilings. Do not think.

  The present invention addresses the actual situation as described above, particularly studies the relationship between air permeability and sound absorption, uses a non-breathable film as an adhesive film, and is desired from the relationship between the air permeability and the aperture area of the film during processing. An object of the present invention is to provide a vehicle interior material that imparts air permeability and shares a sound absorbing function with a short fiber nonwoven fabric, and has an appropriate air permeability and sound absorbing performance as an automobile interior material.

That is, in order to meet the above-mentioned purpose, the present invention has repeatedly studied the appropriate combination of the skin layer, the short fiber non-woven layer, and the adhesive film layer constituting the interior material, and has achieved an interior material excellent in air permeability and sound absorption performance. A non-woven laminate in which a skin layer made of knit and a short fiber non-woven layer are bonded with a non- breathable heat-fusible sheet, and at the time of bonding, desired small holes are formed in the heat-fusible sheet. by opening a, the allowed to maintain the air permeability of the laminate to the range of 0.1~30.0cc / cm ² / sec, stiffness characteristics 200mm or less, the initial elongation modulus 150~2500N / 50mm It is characterized by an interior material for a vehicle excellent in sound absorbing performance, which has a characteristic in the range of / 100%.

Here, the knit constituting the skin layer is preferably a tricot, and preferably has a weight per unit area in the range of 50 to 300 g / m ² .

The short fiber nonwoven fabric desirably has a mass per unit area in the range of 100 to 300 g / m ² , and is an adhesive film as the heat-fusible sheet, and has a melting point in the range of 90 ° C. to 180 ° C. What has thickness in the range of 20-100 micrometers is preferable.

  In addition, the vehicle interior material having the above-mentioned characteristics has no breathability between the knit skin layer and the short fiber nonwoven fabric layer, that is, a breathable adhesive film is sandwiched between the breathable layer and the breathable layer. It is obtained by adhesion processing so that is expressed.

Specifically, the basis weight is 50 to 300 g / m ² made of knit, the skin layer is 0.2 to 1.0 mm thick, the average fineness of the constituent fibers is 0.5 to 10 dtex, and the basis weight is 100 to 100. 300 g / m ^2, short fiber nonwoven layer melting point 90 to 180 ° C. of 20.0mm thick 3.0, basis weight mass 20 to 100 g / m ^2, an adhesive film having a thickness of 20.0~100.0μm In addition, the adhesive is integrated by thermocompression bonding, and when adhering to the adhesive film, a desired small hole is opened and the air permeability of the product is in the range of 0.1 to 30.0 cc / cm ² / sec. Can be obtained.

  According to the interior material of the present invention, when the sound absorbing material absorbs and silences the sound transmitted from the sound source, the sound absorbing material is composed of a skin layer, a film having ventilation resistance, and a bulky fiber layer. When sound enters from the skin layer, the film is first vibrated, and the vibration is facilitated by having an appropriate air permeability to propagate to the fiber layer, and when the fiber layer is compressed by the vibration of the film, It acts as a cushioning material by releasing moderate air, and some sound enters the inside through the ventilation layer, the fiber vibrates in resonance with the sound, and the sound is muted by the fiber layer that changes the sound into heat. The sound absorption function can be achieved. Note that an adhesive resin or the like can be used in place of the film used as the adhesive layer, but since the film is used, the air permeability can be easily controlled.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a schematic view showing an example of a vehicle interior material according to the present invention. In the figure, 1 is a skin layer, 2 is a short fiber nonwoven fabric layer, 3 is a bond between the skin layer 1 and the short fiber nonwoven fabric layer 2. In the adhesive film layer to be integrated, the skin layer 1, the short fiber nonwoven fabric layer 2 and the adhesive film layer 3 form the basic structure of the vehicle interior material according to the present invention. In such a configuration, a predetermined air permeability, bending resistance, and initial tensile elastic modulus are provided.

  Here, the surface skin layer 1 is a layer that is not directly related to sound, and the intermediate adhesive film layer 3 is a layer that controls air permeability, absorbs some sounds, and passes some sound through. It has important functions to decide. In addition, the short fiber layer has a function of resonating with the sound of the film that has passed through the resonance of the film and changing the sound into heat and muting it.

  The present invention finally achieves good air permeability and sound absorption effect as an interior material for a vehicle by specifically specifying each of the above configurations. It is a great feature of the present invention that a non-breathable adhesive film is used and a desired air permeability is imparted during thermocompression processing. Hereinafter, details will be described sequentially.

The skin layer 1 is mainly intended for surface decoration such as aesthetics and luxury as an interior material for vehicles, and does not contribute to air permeability and sound absorption. Knit is used as the material, and tricot and raised tricot fabrics are particularly suitable. And have a basis weight of 50 to 300 g / m ² and a thickness range of 0.2 to 1.0 mm, preferably 0.25 to 0.9 mm, more preferably 0.3 to 0.8 mm. And those having a density range of 0.1 to 0.8 cc / g are used.

If the mass per unit area is less than 50 g / m ² , the skin is thin and the interior surface appears, which is not preferable. On the other hand, if it exceeds 300 g / m ² , the skin is sufficient, but the heat treatment stability during bonding is poor, Therefore, heat transfer is poor and it takes time to bond, which is not preferable. Note that it is preferable to use synthetic fibers such as polyamide and polyester as the fibers forming the skin.

  Next, the short fiber nonwoven fabric layer 2 has a role of a cushion of the film layer and a role of resonating with sound to change the sound into heat and muffled. After entanglement treatment of fiber web by needle processing, non-woven fabric fixed by binder or backing treatment or partially heat-bondable fiber is used for regular of short fiber, and non-woven fabric fixed by heat fusion after entanglement treatment is used Although possible, interlaced nonwoven fabrics by needle processing are most preferred.

  The type of fiber used for the short fiber nonwoven fabric is not particularly limited, but generally known fibers such as polyester fiber, polyamide fiber, polyolefin fiber, etc. are used. Polyester fibers and polyolefin fibers that are versatile and inexpensive are suitable. For example, polyester fibers include fibers made of polyethylene terephthalate, polybutylene terephthalate, polymethylene terephthalate, and the like, and polyolefin fibers include fibers made of low density polyethylene, high density polyethylene, polypropylene, and the like. Of course, various stabilizers, ultraviolet absorbers, thickeners, matting agents, colorants, other various improving agents, and the like may be blended in the polymer constituting these fibers as necessary.

  The average fineness of the fibers constituting the short fiber nonwoven fabric is preferably in the range of 0.5 to 10 dtex (dT), and if the average fineness is 0.5 dT or less, the fibers are too thin to be webbed in the carding process during production, This is not preferable because productivity may be lowered and handling may be inferior.

On the other hand, if the average fineness exceeds 10 dT, the gap between the short fibers is large and the sound absorption performance may be deteriorated, which is not preferable. The short fiber nonwoven fabric preferably has a mass per unit area of 100 to 300 g / m ² , and the most common needle punch nonwoven fabric is the same. Particularly, the mass per unit area is 100 g from the viewpoint of cushioning and sound absorption performance of the interior material. / M ² or more, preferably 110 g / m ² or more, more preferably 120 g / m ² or more. Further, from the viewpoint of weight reduction, 300 g / m ² , especially 280 g / m ² or less is preferable. And as for the thickness range, 3.0-20.0 mm is preferable, More preferably, it is 4.0-15.0 mm, More preferably, it is 5.0-10.0 mm.

  When the thickness range is less than 3.0 mm, it is thin as a cushion or a sound absorbing material, and the effect is poor as with the weight per unit area. On the other hand, when the thickness exceeds 20 mm, it is sufficient as a short fiber nonwoven fabric layer, but the heat treatment stability at the time of bonding is poor, the heat transfer is also poor, and it takes time to bond, which is not preferable. Moreover, since it is too thick as a product and a deformation | transformation may become large, it is unpreferable. The density range is preferably from 0.01 to 0.1 cc / g, and if it is less than 0.01 cc / g, it tends to be deformed at the time of adhesion processing, it is difficult to maintain the thickness, and the cushioning property or sound absorbing performance is poor, which is not preferable. On the other hand, when the density range exceeds 0.1 cc / g, it is sufficient as a short fiber nonwoven fabric layer, but the heat treatment stability at the time of adhesion is poor, which is not preferable.

  In addition, the short fiber nonwoven fabric is formed by tangling the short fibers by needle processing as described above, tangling treatment, binder treatment adhesion, and further, tangling treatment of regular and heat-fusible fibers, and then heat adhesion treatment. The fiber component used here may be a single fiber component or a plurality of fiber components. In addition, these fiber components may be mixed with heat-fusible fibers, followed by needle processing and subsequent fiber-to-fiber adhesion by heat treatment. Also good. In addition to these, it is also possible to use a binder as an adhesive component.

  The heat-fusible fiber to be mixed is a composite fiber having a side-by-side or core-sheath structure composed of the same or different high-melting point resin and low-melting point resin, such as a polyester resin or a polyethylene resin. And a composite fiber having a core-sheath type and a side-by-side type structure composed of a high melting point component and a low melting point component of a thermoplastic resin of any one of a polypropylene resin and a polyamide resin.

  Specific examples include composite fibers of polyester fibers (melting point of about 250 ° C. to 270 ° C.) and low melting point polyester fibers (melting point of about 100 ° C. to 190 ° C.), ester / nylon composite fibers, polyester / polyethylene composite fibers, polypropylene / polyethylene composites. Examples thereof include fibers, and in particular, composite fibers of a high-melting polyester and a low-melting polyester are most practical.

  On the other hand, the binder used as the adhesive component may be either an acrylate ester type or a vinyl acetate type, and the amount applied is suitably in the range of 5 wt% to 20 wt%. If it is less than 5% by weight, there is no effect of the combined use with the heat-fusible fiber, it is difficult to control the thickness, and the heat-fusible fiber is soft and thick, which is not preferable. On the other hand, if it exceeds 20% by weight, there is no effect of the combined use with the heat-fusible fiber, it is difficult to control the thickness, and the effect of the binder becomes strong, which is not preferable.

  Next, since the heat-fusible sheet of the adhesive layer integrates the skin layer 1 and the sound absorbing layer of the short fiber nonwoven fabric 2, an adhesive film suitable for use as a material having adhesive performance and sharing the sound absorbing performance is used. . Among these, a film having no air permeability is used as the film to be used, and an adhesive film having an adhesive property and sound absorbing performance for imparting a desired air permeability during processing is suitable.

  The type of resin for the adhesive film is not particularly limited, but known resins such as modified polyester resins, modified polyamide resins, polyolefins or modified polyolefin resins can be used. A modified polyolefin resin having versatility with respect to the surface is suitable.

  For example, examples of the polyolefin resin include resins made of low density polyethylene, high density polyethylene, modified low density polyethylene, modified high density polyethylene, polypropylene, modified polypropylene, and the like. Of course, various stabilizers, ultraviolet absorbers, thickeners, matting agents, colorants and other various improving agents may be blended in these polymers as necessary.

The adhesive film preferably has a fusion range of 90 ° C. to 180 ° C., and the basis weight is preferably ²⁰ to 100 g / m ² . Moreover, as a thickness range, 20.0-100.0 micrometers is preferable, More preferably, it is 25.0-90 micrometers, More preferably, it is 30.0-80.0 micrometers.

  When the melting point is 90 ° C. or lower, it becomes difficult to control adhesion and air permeability during thermocompression bonding for integrating the knit skin layer and the short fiber nonwoven fabric. On the other hand, if the melting point exceeds 180 ° C., the treatment temperature during processing for integrating the knit skin layer and the short fiber nonwoven fabric becomes high, which makes it difficult to control adhesion and air permeability.

On the other hand, if the weight per unit area is 20 g / m ² or less, the amount of adhesion for integrating the knit skin layer and the short fiber nonwoven fabric becomes insufficient, and delamination may occur, which is not preferable. On the other hand, when the mass per unit area exceeds 100 g / m ² , it is sufficient to integrate the knit skin and the short fiber nonwoven fabric, but it becomes difficult to adjust the air permeability, and the finished product is hardly finished. Is not desirable.

  Further, if the thickness range of the adhesive film is less than 20.0 μm, the adhesive property is obtained, but the adhesive film has a high air permeability and it is difficult to obtain a desired air permeability. On the other hand, if it exceeds 100.0 μm, the knit skin layer is not preferable. Adhesion between the non-woven fabric and the short fiber nonwoven fabric is sufficient, but heat treatment stability at the time of adhesion is poor, and it is difficult to obtain a desired air permeability, which is less preferable than the product surface. Moreover, it becomes hard as a product and is not preferable.

The skin layer 1 and the short fiber nonwoven fabric layer 2 each having a preferable range as described above are integrated by thermocompression bonding through an adhesive film 3 in the middle, and this product is formed as an interior material product. Is in the range of 0.1 to 30.0 cc / cm ² / sec. The air permeability is largely related to the sound absorption performance, and if the air permeability is less than 0.1 cc / cm ² / sec, the sound insulation effect is exhibited and the sound absorption performance is not exhibited. On the other hand, if the air permeability exceeds 30.0 cc / cm ² / sec, the sound absorbing effect is inferior, so the range of 0.1 to 30.0 cc / cm ² / sec is effective. In addition, it is effective that the bending resistance property is 200 mm or less and the initial elastic modulus is in the range of 150 to 2500 N / 50 mm / 100%. The air permeability indicates a control ratio of perforation of the adhesive film, and is determined when the skin and the short fiber nonwoven fabric are thermocompression-bonded and integrated through an adhesive film having no air permeability to determine sound absorption performance.

First air permeability greatly related to sound absorption, air permeability indicates sound insulating effect is less than 0.1cc / cm ² / sec, to undesirable because it does not exhibit the sound absorbing performance, air permeability 30.0 cc / cm ² / If it exceeds sec, the effect of sound absorption is inferior, which is not preferable. Further, the bending resistance property is preferably 200 mm or less by the cantilever method, and if it exceeds 200 mm, it is hard and not preferable as a product. Further, if the initial elastic modulus is less than 150 N / 50 mm / 100%, it is not preferable as an interior material because it does not have a waist and easily deforms against an external force.

  On the other hand, if the initial elastic modulus exceeds 2500 N / 50 mm / 100%, it becomes hard and plastic-like, so it is not preferable as an interior material. .

Thus, as the product characteristics of the interior material of the present invention, the air permeability is in the range of 0.1 to 30.0 cc / cm ² / sec, and the thickness of the adhesive film is 20 to 100 μm. It is useful as a whole that the degree characteristic is 200 mm or less and the initial tensile elastic modulus is 150 to 2500 N / 50 mm / 100%.

  Examples of the present invention will be described below together with comparative examples.

Example 1
A polyester fiber (melting point: 260 ° C.) having a fineness of 2.2 decitex and a fiber length of 51 mm is carded to obtain a web having a weight per unit area of 200 g / m ^2. Subsequently, the surface has a depth of 5 mm and the number of driven wires is 67 / cm ^2. The back surface was similarly subjected to a needle punching treatment with a depth of 7.5 mm and a number of driven fibers of 95 / cm ² , and a surface of 5 mm and a depth of 95 fibers / cm ² to obtain a short fiber layer. A heat-fusible film (weight per unit area: 92.1 g / m ² , thickness: 37 μm, melting point: 95 ° C.) was placed on the obtained short fiber layer, and a tricot knitted fabric basis weight of 92.1 g / m ^2, put the thickness 400μm bonding temperature 180 ° C. in the thermal bonding device (felt calender), processing speed 5 m / min, subjected to a bonding process of the process pressure 2.0 kg / cm ² was obtained interior material of the present invention . Example 2
A polyester fiber (melting point: 260 ° C.) having a fineness of 2.2 decitex and a fiber length of 51 mm is carded to obtain a web having a basis weight of 122 g / m ^2. Subsequently, the surface has a depth of 5 mm and the number of driven wires is 6 / cm ^2. was obtained similarly depth 7.5mm on the back, end counts 95 present / cm ^2, further depth 5mm on the surface, end counts 95 present / cm ² of needle-punched handle short fiber layer. A heat-fusible film (weight per unit area: 21.5 g / m ² , thickness: 37 mm, melting point: 95 ° C.) was placed on the obtained short fiber layer, and a tricot knitted fabric basis weight of 92.1 g / m ^2, put the thickness 400μm bonding temperature 180 ° C. in the thermal bonding device (felt calender), processing speed 5 m / min, subjected to a bonding process of the process pressure 2.0 kg / cm ² was obtained interior material of the present invention .
Example 3
Fineness 6.6 dtex, fiber length 64 mm polyester fiber (melting point: 260 ° C.) 60 mass% and fineness 3.3 dtex, fiber length 51 mm polyester fiber (melting point: 260 ° C.) 20 mass% and fineness 2.2 dtex, A polyester fiber having a fiber length of 51 mm (melting point: 260 ° C.) is uniformly mixed with 20% by mass and carded to obtain a web having a weight per unit area of 145 g / m ^2. Subsequently, a binder solution of acrylic acid ester (concentration) on the surface 18.3 wt%) to 148 g / m ² applied to a continuous dryer (temperature 0.99 ° C., dried in speed 7m / min) with basis weight weight: to obtain a short fiber layer of 172 g / m ^2. A heat-fusible film (weight per unit area: 36.8 g / m ² , thickness: 62 μm, melting point: 120 ° C.) was placed on the obtained short fiber layer, and a tricot knitted fabric weight per unit area was 146 g / m ^2. The interior material of the present invention was obtained by applying an adhesive treatment at a bonding temperature of 175 ° C., a processing speed of 5 m / min, and a processing pressure of 2.0 kg / cm ² using a thermal bonding apparatus (felt calender).
Example 4
60% by mass of a polyester fiber (melting point: 260 ° C.) having a fineness of 6.6 dtex and a fiber length of 64 mm, 20% by mass of a polyester fiber (melting point: 260 ° C.) having a fineness of 3.3 dtex and a fiber length of 51 mm, and a fineness of 2.2 dtex Further, 20% by mass of a polyester fiber (melting point: 260 ° C.) having a fiber length of 51 mm is uniformly mixed and carded to obtain a web having a weight per unit area of 145 g / m ^2. Subsequently, the surface has a depth of 13.8 mm, A needle punching process with 22 hammers / cm ² was applied, and a binder solution of acrylic acid ester (concentration 18.3% by mass) was further applied at 148 g / m ^2, and a continuous dryer (temperature 150 ° C., speed 7 m / min) To obtain a short fiber layer having a weight per unit area of 172 g / m ² . A heat-fusible film (weight per unit area: 36.8 g / m ² , thickness 62 μm, melting point: 120 ° C.) is placed on the obtained short fiber layer, and further a tricot knitted fabric basis weight 146 g / m ² and thickness 500 μm. The interior material of the present invention was obtained by applying an adhesive treatment at a bonding temperature of 175 ° C., a processing speed of 5 m / min, and a processing pressure of 2.0 kg / cm ² using a thermal bonding apparatus (felt calender).
Comparative Example 1
A tricot knitted fabric basis weight of 146 g / m ² , a polyethylene powder (Ube Industries, Ltd., polyethylene UM8510, melting point: 103 ° C.) having a particle size distribution of 20 mesh on a back surface of 500 μm thickness is uniformly sprayed at 30 g / m ^2. In Example 3, a tricot surface on which a polyethylene powder was temporarily bonded by applying a temporary bonding process at a bonding temperature of 110 ° C., a processing speed of 5 m / min, a processing pressure of 2.0 kg / 5 cm ^{2 with} a thermal bonding apparatus (felt calender). A comparative interior was placed on the short fiber layer having the same structure as that obtained and subjected to a main adhesion treatment at a bonding temperature of 180 ° C., a processing speed of 5 m / min, and a processing pressure of 2.0 kg / cm ² with a thermal bonding apparatus (felt calender). The material was obtained.
Comparative Example 2
60% by mass of a polyester fiber (melting point: 260 ° C.) having a fineness of 6.6 dtex and a fiber length of 64 mm, 20% by mass of a polyester fiber having a fineness of 3.3 dtex and a fiber length of 51 mm (melting point: 260 ° C.), and a fineness of 2.2 Decitex, 20% by mass of polyester fiber (melting point: 260 ° C.) with a fiber length of 51 mm is uniformly mixed and carded to obtain a web having a weight per unit area of 145 g / m ² , and subsequently driven into the surface with a depth of 13.8 mm. 22 needles / cm ² are subjected to needle punching, and acrylate ester binder solution (concentration 18.3% by mass) is further applied at 148 g / m ² in a continuous dryer (temperature 150 ° C., speed 7 m / min). By drying, a short fiber layer having a weight per unit area of 172 g / m ² was obtained. A heat-fusible film (weight per unit area: 74 g / m ² , thickness: 122 μm, melting point: 120 ° C.) is placed on the obtained short fiber layer, and a tricot knitted fabric basis weight is 146 g / m ² , thickness. A comparative interior material was obtained by carrying out an adhesion treatment at an adhesion temperature of 175 ° C., a treatment speed of 5 m / min, and a treatment pressure of 2.0 kg / cm ² using a thermal bonding apparatus (felt calender).
Comparative Example 3
A polyester fiber having a fineness of 6.6 dtex and a fiber length of 64 mm (melting point: 260 ° C.) is uniformly spread and carded to obtain a web having a weight per unit area of 100 g / m ² , and subsequently driven into the surface with a depth of 6 mm. subjected to needle punching in the number nineteen / cm ^2, further binder solution of an acrylic acid ester (concentration 18.3 wt%) was total 273 g / m ² applied in successive grant drying process (drying conditions: temperature 0.99 ° C. And dried at a speed of 7 m / min) to obtain a short fiber layer having a basis weight of 150 g / m ² . A heat-fusible film (weight per unit area: 36.8 g / m ² , thickness: 62 μm, melting point: 120 ° C.) was placed on the obtained short fiber layer, and a tricot knitted fabric weight per unit area was 146 g / m ^2. Then, with a thickness of 500 μm, a comparative interior material was obtained by applying an adhesive treatment at a bonding temperature of 175 ° C., a processing speed of 5 m / min, and a processing pressure of 2.0 kg / cm ² with a thermal bonding apparatus (felt calender).

Thus, the product characteristics and the sound absorption coefficient were compared for each of the interior materials obtained in the above examples and comparative examples. The results are shown in Table 1 below. The basis weight, thickness, initial tensile elastic modulus, bending resistance, air permeability, and sound absorption in the table were measured based on the following.
(A) Amount of basis weight This was determined in accordance with the method described in 8.4.2 of JIS L1096.
It was measured with a load 2 k Pa according to the method described in 8.5.1 of (b) thickness of JIS L1096.
(C) Test of initial tensile elongation modulus using 50 k g Tensilon manufactured by Toyo bold in Inc., sample length 100mm with the sample width 50 mm, of the sample at a pulling rate of 100mm / min strength and elongation were measured in TsuyoShin curve Calculated from the initial slope. Shown as an average of N = 3. Unit is N / 50mm / 100%
(D) Bending resistance Measured by the cantilever method described in 8.19.1 of JIS L1096, except that the sample length was 30 cm.
(E) Air permeability The air permeability was measured by the method A of 827.1 of JIS L1096-1999.
(F) Sound absorption Based on JIS A 1405, the normal incidence sound absorption coefficient of the building material by the pipe method was measured.

It is a cross-sectional schematic diagram which shows the structure of the vehicle interior material which concerns on this invention.

Explanation of symbols

1: Skin layer 2: Short fiber nonwoven fabric 3: Heat-fusible sheet (adhesive film)

Claims (5)

A nonwoven fabric laminate in which a skin layer made of knit and a short fiber nonwoven fabric layer are laminated, wherein the knit and the short fiber nonwoven fabric layer are bonded with a heat-fusible sheet, and the heat-fusible sheet is breathable Film is used, and at the time of bonding, a desired small hole is opened to maintain the air permeability of the laminate in the range of 0.1 to 30.0 cc / cm ² / sec, and the bending resistance property is A vehicle interior material excellent in sound absorbing performance, characterized by having a characteristic of 200 mm or less and an initial tensile elastic modulus of 150 to 2500 N / 50 mm / 100%. Knitting is tricot, a vehicle interior material having a basis weight mass and excellent sound absorbing performance according to claim 1, wherein in the range of ^{50g / m 2 ~300g / m 2} . Staple fiber nonwoven layer having a basis weight mass 100g / m ² ~300g / m is in the range of ² claims 1 or 2 sound absorbing performance excellent vehicle interior material described.   4. The vehicle according to claim 1, 2 or 3, wherein the heat-fusible sheet is a film and has a melting point in the range of 90 to 180 [deg.] C. and a thickness in the range of 20 to 100 [mu] m. Interior material. Knit weight of 50 to 300 g / m ² , a thickness of 0.2 to 1.0 mm, and an average fineness of the constituent fibers of 0.5 to 10.0 decitex (dT), with a weight of 100 to 100 300 g / m ² , a short fiber nonwoven fabric layer having a thickness of 3.0 to 20.0 mm, an intermediate melting point of 90 to 180 ° C., a basis weight of 20 to 150 g / m ² and a thickness of 20.0 to 100.0 μm It is characterized by being polymerized through a breathable film, integrated by thermocompression bonding, and exhibiting a desired opening at the time of adhesion, giving a permeability of 0.1 to 30.0 cc / cm ² / sec. Automotive interior material with excellent sound absorption performance.

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