JP2018162527A - Piloerection skin material for interior material - Google Patents

Abstract

A napped surface material that is used as an interior material by attaching a base material such as felt on the lower side, has high sound absorption and does not show through even if it has a low basis weight, and is mainly suitable for interior materials of automobiles and vehicles. offer. The upper layer comprises 40-70% ordinary fibers having a fineness of 2.2-6.6 dt and 30-50% hollow fibers having a fineness of 7.8 dt or less, and the lower layer comprises a fineness of 0.5. 30-60% ultrafine fibers of ~2.5 dt and 40-70% medium fine fibers of fineness 2.5-3.5 dt are blended, the upper and lower layers are polymerized, and needle-punched from the lower layer side. . [Selection drawing] Fig. 1

Description

  The present invention uses a base material such as a felt attached as an interior material, and has a high sound-absorbing property and does not show through even if it has a low basis weight, and is mainly a napped skin material suitable for interior materials of automobiles and vehicles. About.

  Interior materials are affixed to automobiles in floor carpets and luggage rooms, etc. In order to improve the feel and design, the interior materials are made of soft or velor-like napped skin material made of plastic or felt. Adhere to the surface of the sheet. This napped skin material has a plastic or felt sheet attached to its lower side, thereby improving sound absorption and reducing noise entering the vehicle compartment from the trunk room, and further improving rigidity and formability to a certain level. Strength can be maintained.

  In order to obtain a three-dimensional interior material, the present applicant applies a low melting point resin such as a polyolefin resin to the back surface of the napped sheet in Japanese Utility Model Laid-Open No. 58-184593. Japanese Patent Laid-Open No. 6-299453 proposes that a plain-type napped skin material and a felt sheet are entangled by needle punching and integrated, and then hot press-molded. In JP-A-11-99869, a skin material layer obtained by laminating a skin on a dense layer and a base material layer of a felt sheet are bonded together, and the dense layer is mainly a resin material such as polyethylene or rubber. In JP-A-11-342801, the skin material is composed of two layers of entangled nonwoven fabric, the first skin is a polypropylene fiber that is easily welded to the polypropylene sheet, and the second skin is a polyester having a higher melting point than the first skin. Nylon fiber is used.

  On the other hand, Japanese Patent Application Laid-Open No. 2008-13090 uses a spunbond nonwoven fabric integrated with a felt sheet as a fiber base material to which a skin material having a nap feeling can be bonded at room temperature. By forming a granular melt on the entire surface of the spunbond nonwoven fabric by pre-heating treatment, when the felt base material is reheated alone, the spunbond nonwoven fabric is melted and bonded to the skin material. it can.

Japanese Utility Model Publication No. 58-184593 JP-A-6-299453 JP-A-11-99869 JP-A-11-342801 JP 2008-13090 A

  In the case of hot press molding after applying a polyolefin resin to a nap sheet as in Japanese Utility Model Publication No. 58-184593, the sound absorption and breathability of the interior material is impaired even if the productivity is good. The resin may ooze out. As described in JP-A-6-299453, JP-A-11-99869 and JP-A-11-342801, the skin material is a polyester fiber having a normal fineness, and after the skin material and the felt sheet are intertwined and integrated, When the press molding is performed, even if the skin material does not melt, the nap of the skin lays flat due to the hot press molding, and the touch and aesthetics are likely to deteriorate.

  Japanese Patent Application Laid-Open No. 2008-13090 discloses a method in which a skin material having a feeling of nap is formed by a cold press when being bonded to a felt base material, so that the nap of the epidermis does not lie flat by hot press molding, It is possible to obtain an interior material that retains the feeling of napping. Although the fiber base material of this interior material has relatively few defects, it is desired that the skin material has an improved texture, that is, feel, is difficult to see through even with a low basis weight, and further has improved sound absorption performance.

  The present invention has been proposed in order to improve the above-mentioned problems associated with conventional napped skin materials, and when used together with a base material as an interior material, it is difficult for hair to fall down after thermoforming, which reduces the texture. The object is to provide a napped skin material that is excellent in sound absorption. Another object of the present invention is to provide a napped skin material that is easy to reduce in weight because ground penetration does not occur even when pulled during thermoforming.

  The napped skin material according to the present invention is used together with the lower base material in the interior material. In the napped skin material of the present invention, 40 to 70% of normal fibers having a fineness of 2.2 to 6.6 dt (decitex) and 30 to 50% of hollow fibers having a fineness of 7.8 dt or less are mixed, and the lower layer has a fineness. 30 to 60% ultrafine fibers of 0.5 to 2.5 dt and 40 to 70% of medium fine fibers of fineness 2.5 to 3.5 dt are blended, the upper layer and the lower layer are polymerized, and from the lower layer side The whole is integrated by needle punching.

In the napped skin material according to the present invention, 0 to 10% of low melting point fibers having a fineness of 4.4 to 6.6 dt may be blended in the upper layer, and this low melting point fiber has a melting point of 110 to 180 ° C. is there. In the upper layer, 0 to 15% of flame retardant fiber having a fineness of 3.3 to 6.6 dt may be blended. This flame retardant fiber is preferably flame retardant polyester, rayon or flame resistant fiber. The basis weight of the upper layer is 60 to 240 g / m ² , the basis weight of the lower layer is 90 to 360 g / m ² , and the thickness is preferably 1 to 10 mm.

In order to produce the napped skin material according to the present invention, after the upper layer and the lower layer are polymerized, needle punching is performed in two stages from the lower layer side, and the number of first punches is 30 to 80 / cm ² . The number of second punches to be driven is preferably 100 to 300 / cm ² . Moreover, after raising the whole with a needle punch, a napping process is performed, and when the heat treatment is further performed, the heating temperature is adjusted according to the fiber used. In the case of polyester fiber, the heat treatment is performed at 180 to 250 ° C. at 60 ° C. It is preferable to carry out for ~ 180 seconds.

  The napped skin material according to the present invention can be bonded and integrated above a fiber or plastic substrate, and used as an interior material. The upper layer of the napped skin material contains a certain amount of hollow fiber, and this hollow fiber has a restoring force due to the spiral shape of the crimp, and has a higher porosity than normal fibers, so it has sound absorption Can be improved. As a result, the napped skin material of the present invention is less likely to fall down after thermoforming, maintains a predetermined texture and appearance, and has excellent sound absorption. The interior material provided with the napped skin material of the present invention has flexibility and is easy to fit on the inner surface of the vehicle, and is not only for automobiles and vehicles, but also for industrial materials such as soundproofing and heat insulating materials, heat insulating materials for ski wear, and gloves It can also be applied to cold clothing such as padding and hats.

  The napped skin material according to the present invention consists of two upper and lower felt layers, and the lower layer is entangled with fine fibers, so even if the weight per unit area is reduced, the inner layer is thin. Further, by covering with ultrafine fibers, the see-through becomes inconspicuous when pulled during thermoforming, and the weight of the interior material becomes easy. In the napped skin material of the present invention, the middle layer and ultrafine fibers of the lower layer are mixed into the surface raised portion by needle punching from the lower layer side, and the fibers of the surface raised portion are aligned so that the texture of the surface is increased. Be supple and soft.

  In order to manufacture the napped skin material according to the present invention, after the upper layer and the lower layer are polymerized, needle punching is performed in two stages from the lower layer side. At this time, the wraps released from the card / cross wrapper of each upper layer / lower layer are polymerized, and by carrying out with a two-layer batch type punch line, it becomes possible to efficiently produce napped skin material and at a low cost. Can be manufactured. The napped skin material of the present invention may further be blended with 0 to 10% of low-melting fiber, and the wear resistance is increased by the interposition of the low-melting fiber. .

It is an expanded sectional view showing the napped skin material concerning the present invention. It is an expanded sectional view which shows the interior material which bonded the felt raw material to the napped skin material of FIG. It is a schematic side view which illustrates the first half of the manufacturing process of a napped skin material. It is a schematic side view which illustrates the second half of the manufacturing process of a napped skin material. It is the photograph which showed clearly the transition state to the fiber of the upper layer and lower layer in a napping skin material. It is a graph which displays the sound absorption property of the interior material which affixed the felt base material to the napping skin material of this invention, and the current competitor's product.

  As shown in FIG. 1, the napped skin material 1 according to the present invention is integrated as a whole by superposing an upper layer 2 of thicker fibers and a lower layer 3 of thinner fibers and needle punching from the lower layer side. Make it. The obtained felt material is further raised by a known random velor machine 24 (FIG. 4) or the like to form the raised hair 5 having a good tactile feel on the surface. As shown in FIG. 2, the napped skin material 1 is bonded to a felt base material 6 to obtain an interior material 7 having a desired thickness and weight.

  In the upper layer 2, it is preferable to mix 40 to 70% of normal fibers having a fineness of 2.2 to 6.6 dt and 30 to 50% of hollow fibers having a fineness of 7.8 dt or less. In the upper layer 2, in order to give the smoothness of the surface and the voluminous volume feeling, a normal fiber having a fine fineness is used as a base, and the hollow fiber improves the sound absorption performance of the napped skin material 1, and It is added so that the raised hairs 5 are less likely to fall down.

  In the upper layer 2, 40 to 70% of normal fibers having a fineness of 2.2 to 6.6 dt, preferably 2.5 to 3.5 dt are added. When this fine fiber has a fineness of less than 2.2 dt, it is difficult to produce a napped volume feeling, and when the fineness exceeds 6.6 dt, the smoothness of the surface of the napped skin material 1 decreases. In addition, when 40 to 70% of the total amount of the upper layer is added to this normal fiber and the addition rate is less than 40%, the flatness of the skin material 1 is lowered, and when it exceeds 70%, it is difficult to avoid the fall of the napped 5. Become.

  In the upper layer 2, the hollow fiber generally has a hollowness of 15 to 25%, an apparent fineness is thick, a crimp is spiral and has a waist, and when the fineness exceeds 7.8 dt, the hardness is increased and the skin surface Therefore, the fineness is preferably 5.5 to 6.6 dt. The addition rate of the hollow fiber is 30 to 50%. When less than 30% of hollow fibers are added, it is difficult to impart a volume feeling to the napped skin material 1, while when it exceeds 50%, the flexibility of the napped skin material 1 is likely to be impaired. In general, it is preferable to add about 40% of hollow fibers in consideration of the improvement in sound absorption and the difficulty of falling down.

  The hollow fiber is manufactured as a kind of irregular cross-section fiber using, for example, a special spinning nozzle (die) in the melt spinning of synthetic fiber, and this point is the same in the case of polyester, acrylic, polyamide, etc. During spinning, bubbles are produced inside the fiber to produce a yarn having a hollow cross section. The cross-sectional shape of the hollow fiber is slightly elliptical than the round shape, and the nozzle is changed in the melt spinning of the polyester fiber, and is produced in the order of spinning, drawing, crimping and cutting. The cross-sectional shape of the nozzle includes 1C type and 2C type, and is not limited to the hollow manufacturing method, but the hollow ratio is preferably close to 20%. Examples of usable hollow fibers include 6.6 dt × 76 mm hollow polyester fibers (product number: BL-C HLW-17), 5.3 dt × 64 mm hollow polyester fibers (product number: FG39-C), and the like.

  In order to increase the abrasion resistance of the napped skin material 1, 0 to 10% of a low melting point fiber having a fineness of 4.4 to 6.6 dt may be added to the upper layer 2, and the melting point of the low melting point fiber Is 110 to 180 ° C. and needs to be melted during heat treatment. At this time, if the addition ratio of the low-melting fiber exceeds 10%, the napped skin material 1 becomes hard, the feeling of napping is impaired, and the texture is deteriorated.

  In the upper layer 2, the low melting point fiber usually has a melting point lower by about 40 to 70 ° C. than ordinary fibers and hollow fibers, and contributes to the overall integration and adhesion to the lower layer 3 as a binder during heat treatment. Examples of the low melting point fiber include low melting point polyester, low melting point polyamide, polyethylene, and polypropylene, and may be a copolymer with ethylene or butene. As long as the low melting point fiber has a lower melting point than that of a normal fiber, a known fiber, a resin filament, or a mixed fiber thereof can be used, and may be a composite fiber such as a parallel or core-sheath structure. In the case of the core-sheath structure polyester fiber, the sheath fiber is a low-melting polyester having a melting point of 110 ° C., and the core fiber is a regular polyester having a melting point of 250 ° C. When the core / sheath PP / PE fiber is used, the sheath fiber is polyethylene having a melting point of 130 to 134 ° C., and the core fiber is polypropylene having a melting point of 165 ° C.

  It is also possible to add 0 to 15% of flame retardant fiber having a fineness of 3.3 to 6.6 dt together with or in place of the low melting point fiber depending on the application. The flame retardant fiber is not limited to the flame retardant polyester fiber but may be rayon or flame resistant fiber as long as it conforms to the flame retardant standard FMVSS302 method. The flame retardant fiber is added when flame retardant is required for the skin material alone, and when the addition rate exceeds 15%, both the nap feeling and the texture of the napped skin material 1 are lowered.

  On the other hand, in the lower layer 3, it is preferable to mix 30 to 60% ultrafine fibers having a fineness of 0.5 to 2.5 dt and 40 to 70% medium fine fibers having a fineness of 2.5 to 3.5 dt. The lower layer 3 is usually made of fibers with finer fineness than the upper layer 2, and the fineness of the lower layer 3 makes the interior material 7 invisible. In this specification, in order to compare and display general fiber thicknesses, they are used separately from normal fibers, ultrafine fibers, and medium thin fibers, but the fineness of each fiber is not distinguished by terms.

  In the lower layer 3, 30 to 60% of extra fine fibers having a fineness of 0.5 to 2.5 dt are added. If the ultrafine fiber content is less than 30%, the effect of the covering will be impaired and it will be difficult to improve the sound absorption performance of the napped skin material 1, and if it exceeds 60%, the card property will be deteriorated, that is, spinning from the card machine. The output is reduced. For example, if the fineness of the ultrafine fiber is 2.2 dt, it is preferable to add 40% in the lower layer 3. With respect to the lower layer 3, the term “fine fiber” actually means a fiber having a fineness of 1.1 dt or less, which is difficult to spin, but is used in this specification to express a general fiber thickness. . In order to produce short ultrafine fibers, a melt blow method, a centrifugal spinning method, a flash spinning method, a beating method, a mixed spinning method, a tag spinning method, or the like may be used.

  On the other hand, the amount of medium fine fibers having a fineness of 2.5 to 3.5 dt is determined depending on the amount of ultrafine fibers used. The medium fine fiber is preferably set to a fineness of 2.5 to 3.5 dt in order to unify the fineness of the lower layer 3 as a whole, and if the fineness exceeds 3.5 dt, the effect of preventing see-through is reduced. Preferably, it is 3.3 dt or less.

Regarding the fabric condition of the napped skin material 1, the upper layer 2 usually desirably has a basis weight of 60 to 240 g / m ² , and more preferably 70 to 120 g / m ² . On the other hand, the lower layer 3, it is usually desirable basis weight is 90~360g / ^{m 2,} more desirably 100~180g / ^{m 2.} For this reason, as for the whole napped-up skin material 1, it is desirable that a fabric weight is 150-600 g / m < ² >, More desirably, it is 180-300 g / m < ² >. In the preferred specification, the thickness is 1-10 mm, most desirably 1-5 mm.

  Examples of the fiber material of the napped skin material 1 include polyester fibers, acrylic fibers, polyamide fibers, polyolefin fibers, and the like, preferably polyester fibers that are inexpensive and easy to handle, and an upper layer that includes low-melting fibers and flame-retardant fibers. 2. If all of the lower layer 3 and the felt base 6 are made of polyester fiber, the material is unified and the interior material can be easily recycled. As the above-mentioned fiber fiber material, in addition to the synthetic short fibers, if possible, an appropriate amount of the same kind of bristles (recovered recycled cotton) may be contained.

  In order to continuously manufacture the napped skin material 1, a manufacturing mechanism 8 having a combination arrangement schematically shown in FIG. 3 may be used. In the adjacent first and second card / cross wrappers 10 and 12, a web is formed by blending normal fibers, hollow fibers, etc. or two kinds of thinner short fibers with a known card machine, and this integrated layer is used as a cross wrapper. The upper layer web 14 and the lower layer web 16 having a predetermined thickness can be obtained by superimposing them, and can be produced efficiently and inexpensively by carrying out with a two-layer batch line. At this time, it is possible to polymerize the two webs separately by using two sets of card / cross wrappers. However, since the number of steps increases, the manufacturing cost increases.

Punching machines 18 and 20 are positioned behind the cross wrappers 10 and 12 on the conveyor that conveys the webs 14 and 16. In the punching machines 18 and 20, since the fibers of the upper layer 2 are not transferred to the lower layer 3, the needle punching is performed twice from the lower layer 3 side. Is preferably 30 to 80 / cm ² , and the second time is to use a needle count of 36 to 40, and the number of driving is preferably 100 to 300 / cm ² .

The obtained two-layer skin material 22 is raised through a random velor machine 24 in FIG. Examples of the random velor machine 24 include a Diloer machine (manufactured by Dilo) or a super looper machine (manufactured by Ferrer). In the random velor machine 24, it is desirable that the fork needle 25 having a needle count of 38 to 42 is used and the number of driven needles is 300 to 600 / cm ^{2. Even} if a crown needle is used according to the purpose, the fork needle and the crown You may mix and use a needle. In addition, when using the velor needle, in addition to the velor needle, a cord may be used according to the purpose, or a velor needle and a cord may be mixed and used.

FIG. 5 is a photograph in which the transition state is clarified in the fibers of the upper layer 2 and the lower layer 3 in the napped skin material 1. In the napped skin material shown in FIG. 5, the upper layer 2 is a black web 26 having a basis weight of 100 g / m ² made of 60% normal polyester fiber of 3.3 dt and 40% of hollow polyester fiber of 6.6 dt. 3 is a white web 28 having a basis weight of 150 g / m ² made of 40% of 2.2 dt ultrafine polyester fibers and 60% of 3.3 dt medium fine polyester fibers. The polymerized web is raised through punching machines 18 and 20 and a random velor machine 24.

  As apparent from FIG. 5, in the napped skin material 1, the upper layer 2 of the black web 26 and the lower layer 3 of the white web 28 are clearly separated, and the fibers of the upper and lower layers are not mixed, and the napped 30 Are mixed with upper and lower layers of fibers. As a result, when the lower layer 3 is made of finer fibers, the see-through is less noticeable even if the napped skin material 1 is stretched. Moreover, by putting hollow fibers in the upper layer 2, it becomes difficult for the hair to collapse during molding, and the sound absorption is improved.

  The heat treatment of the napped skin material 1 is performed regardless of whether or not the low melting point resin is added to the upper layer 2, so that the fiber oil contained in the fibers jumps, and the polyester fiber has set properties. It becomes hard to fall down. The heat treatment machine 31 shown in FIG. 4 is a hot air suction that uniformly heats with hot air circulating in the machine, and is installed behind the random velor machine 24. In FIG. 5, the heat treatment machine 31 and the random velor machine 24 are shown in series, but both may be installed separately according to the layout of the factory, and the same applies to the manufacturing mechanism 8. This heat treatment varies depending on the constituent fibers of the upper layer 2 and the lower layer 3, and in the case of polyester fibers, it is desirable to heat at a heating temperature of 180 to 250 ° C. for 60 to 180 seconds.

  When the obtained napped skin material 1 is used as a moldable interior material having a desired thickness, a felt base material 6 (FIG. 2) or a plastic base material having appropriate elasticity and sound absorption is used at room temperature or What is necessary is just to stick below by heat processing. The material and use of the felt base material 6 or the plastic base material are not particularly limited, and a needle felt material is usually suitable as an automobile interior material.

  In order to mold and process the interior material in which the felt base material 6 is attached to the napped surface material 1, the front and back are heated with a heater, molded with a specific type of cold press, and after cooling, unnecessary portions are trimmed with a trimming press. Just trim it. At this time, even if the heating temperature by the heater is 120 ° C. to 220 ° C., it is necessary to suppress the heating temperature on the raised side of the interior material to about 140 ° C., and the temperature on the raised side is up to about 200 ° C. It should be noted that the raised texture will be damaged if it is raised too much.

  Next, the present invention will be described based on examples, but the present invention is not limited to the examples. In order to manufacture the napped skin material 1 shown in FIG. 1, 60% of normal polyester short fibers having a fineness of 3.3 dt and 40% of hollow polyester short fibers having a fineness of 6.6 dt are mixed as the upper layer 2. In addition, as the lower layer 3, 60% of fine polyester short fibers having a fineness of 3.3 dt and 40% of ultrafine polyester short fibers having a fineness of 2.2 dt are mixed. These short fibers are all black.

In the card cross wrappers 10 and 12 of FIG. 3, the basis weight of the upper web is 100 g / m ² , the basis weight of the lower web is 150 g / m ² , and the overall basis weight is set to 250 g / m ² . In the punching machines 18 and 20, needle punching is performed twice from the lower layer 3 side, the first time using a needle count of 40, the number of driving is 40 / cm ² , and the second time using a needle count of 40. The number is 123 / cm ² .

The two-layer skin material 22 is raised through a random velor machine 24 in FIG. In the random velor machine 24, a 40th fork needle is used, and the number of driven needles is 450 / cm ² . Further, in the hot air suction of the heat treatment machine 31, heating is performed at a heating temperature of 205 ° C. for 90 seconds. The thickness of the obtained napped skin material 1 is 3 mm.

  When the napped skin material 1 obtained is used as a moldable interior material, the felt base material 6 (FIG. 2) is attached to the lower side at room temperature or heat treatment. As the felt base material 6, a needle felt material is suitable for an interior material for automobiles. In order to mold this interior material, for example, the front and back are heated with a heater and molded with a specific type of cold press. At this time, the heating temperature by the heater is 120 ° C. to 220 ° C., and the heating temperature on the napped side of the interior material is suppressed to about 140 ° C. Even if it heat-molds, the napped skin material 1 does not impair the volume feeling of napped, the surface texture improves, and the sound absorption performance is also excellent. Since the napped skin material 1 has a two-layer fiber structure, it is difficult to see through even with a low basis weight, and is suitable as a molded interior material for use in automobile floor carpets and luggage rooms.

  As the upper layer 2, 55% of normal polyester short fibers having a fineness of 3.3 dt, 40% of hollow polyester short fibers having a fineness of 6.6 dt, and 5% of low-melting polyester fibers having a fineness of 4.4 dt are mixed and 5% A napped skin material is produced in the same manner as in Example 1 except that low-melting ester fibers are mixed.

  The napped skin material has higher wear resistance than the napped skin material 1 of Example 1. A felt base material is attached to the napped skin material downward at room temperature or by heat treatment. In order to mold this interior material, the front and back are heated with a heater and molded with a specific type of cold press. At this time, the heating temperature by the heater is 120 ° C. to 220 ° C., and the heating temperature on the napped side of the interior material is suppressed to about 140 ° C. Even if this napped skin material is heat-molded, the volume of napped hair is not impaired, the surface texture is improved, and the abrasion resistance and sound absorbing performance are excellent.

  As the upper layer 2, 50% of normal polyester short fibers having a fineness of 3.3 dt, 40% of hollow polyester short fibers having a fineness of 6.6 dt, 5% of low melting point polyester fibers having a fineness of 4.4 dt, and difficulty of having a fineness of 3.3 dt A napped skin material is produced in the same manner as in Example 1 except that 5% of the flame retardant fiber is mixed with 5% of the low-melting polyester fiber and the flame retardant ester fiber.

  This napped skin material is used alone for applications that require flame retardancy. Even if this napped skin material is heat-molded, the volume feeling of napped hair is not impaired, the surface texture is improved, and flame retardancy, abrasion resistance and sound absorption performance are also excellent.

About the interior material provided with the napped skin material 1 manufactured in Example 1, the weight per unit area is manufactured at 200 g / m ² or 250 g / m ² in order to compare with the products of other companies, and the thickness is 2.5 mm or Set to 3.0 mm. On the other hand, the current competitor's product is a velor-like felt obtained by raising napped polyester fibers of 3.0 mm pitch 250 g / m ² , and the thickness is set to 2.5 mm.

The felt base material 6 of the common specification includes, as a felt main body layer, 20% of a normal polyester fiber having a fineness of 7.8 dt, 20% of cotton (used clothes), 40% of a low melting point polyester fiber having a fineness of 4.4 dt, Blend 20% polypropylene fiber with a fineness of 4.4 dt, and make the weight per unit area with a needle punch to about 900 g / m ² . The skin layer is made of 60% normal polyester fiber having a fineness of 6.6 dt and 40% normal polyester fiber having a fineness of 2.2 dt, with a basis weight of 250 g / m ² . The skin layer and the main body layer are overlapped, and a spunbond nonwoven fabric made of polypropylene is placed on the intermediate layer, and needle punching is applied to the whole to integrally combine the three layers. When this is pre-heated at 180 ° C. for 2 minutes, a felt base material having an adhesive layer melted in a granular form on the base material surface is obtained. When the napped skin material is bonded to the felt base material, only the felt base material is reheated at 200 ° C. for 1 minute, and the adhesive layer and the back surface of the napped skin material are overlapped and molded simultaneously with bonding.

  As for the napped skin material 1 manufactured in Example 1 and the napped skin material of the current competitors, as shown in the table below, after the above felt base material 6 is bonded together, the overall thickness and basis weight are measured. Further, the density is measured. About the interior materials which are these products, the sound absorption data by the normal incidence method was measured, and the result is shown in the graph of FIG.

From the graph of FIG. 6, the napped skin material 1 of Example 1 obtained a result in which the sound absorption was clearly improved as compared with the current competitor's product which is a one-layer product. The sound absorption of the napped skin material 1 with a basis weight of 200 g / m ² is about 24% lower than the existing competitors obtained by the conventional construction method, with a basis weight reduced by 50 g / m ^{2, and a} raised nap with a basis weight of 250 g / m ² The sound absorption of the skin material 1 is improved by about 65%. Since the napped skin material 1 has a two-layer structure, each layer has functionality, and sound attenuation is increased by a complicated fine structure, and sound absorption is also increased by addition of hollow polyester fibers. is there.

1 napped skin material
2 Upper layer 3 Lower layer 5 Napped 6 Felt base material 7 Interior material

Claims (6)

  A napped skin material used together with a lower base material in an interior material, wherein the upper layer is composed of 40 to 70% normal fibers having a fineness of 2.2 to 6.6 dt and hollow fibers 30 to 30 having a fineness of 7.8 dt or less. 50% blended cotton, the lower layer blended 30-60% extra fine fiber with fineness 0.5-2.5dt and 40-70% medium fine fiber with fineness 2.5-3.5dt, upper layer A napped skin material in which the whole is integrated by polymerizing the lower layer and needle punching from the lower layer side.   The napping according to claim 1, wherein the upper layer is further mixed with 0 to 10% of low melting point fiber having a fineness of 4.4 to 6.6 dt, and the low melting point fiber has a melting point of 110 to 180 ° C and melts during heat treatment. Skin material.   2. The napping according to claim 1, wherein the upper layer is further mixed with 0 to 15% of a flame-retardant fiber having a fineness of 3.3 to 6.6 dt, and the flame-retardant fiber is a flame-retardant polyester, rayon or flame-resistant fiber. Skin material. Basis weight of the upper layer is 60~240g / ^{m 2,} the basis weight of the lower layer is 90~360g / ^{m 2,} napped surface material according to claim 1, wherein a thickness of 1 to 10 mm. After the upper layer and the lower layer are polymerized, needle punching is performed in two stages from the lower layer side, the number of first punches is 30 to 80 / cm ² , and the number of second punches is 100 to 300 The napped skin material according to claim 1, which is / cm ² .   After the whole is integrated with the needle punch, the napping treatment is performed, and when the heat treatment is performed, the heating temperature is adjusted according to the fiber used. In the case of polyester fiber, the heat treatment is performed at 180 to 250 ° C. for 60 to 180 seconds. The napped skin material according to claim 1.

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