Vehicle interior knitted fabric and manufacturing method thereof

Abstract

To provide a vehicle interior knitted fabric that is highly stretchable, excellent in cushioning property, usable without laminating urethane foam as a cushion layer on a rear face side, and has high recyclability.SOLUTION: A vehicle interior knitted fabric according to the invention is a double jersey and knitted so as to include water-soluble fibers. Projections extending longer in a thickness direction of the knitted fabric than the thickness of the knitted fabric are formed on alternate wales on a rear face side by dissolving and removing the water-soluble fibers.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a knitted fabric for vehicle interiors. [Background technology]

[0002] In recent years, improving the recyclability of parts has become a challenge in the automotive industry. For example, composite components are required to be easily disassembled and made from a single material. Vehicle interior skin materials include woven and knitted fabrics made from synthetic fibers such as polyester, and resin sheet materials known as synthetic leather, which are made by laminating polycarbonate-based urethane resin or polyvinyl chloride resin onto synthetic fabrics. To provide cushioning and absorb wrinkles during installation and sewing, a cushioning material such as soft urethane foam is laminated on the back side. To improve seat covering workability, three-layer composite components are used, with a backing material such as a woven or knitted synthetic fabric or nonwoven fabric laminated on top.

[0003] However, composite materials made by laminating a surface material with a flexible urethane foam or a backing fabric material have the problem of being difficult to disassemble and poorly recyclable because they are made of different materials. Furthermore, in the case of composite materials, the combustion behavior of each material differs, and in order to meet the flame retardancy standards for automotive interior materials, flame retardants must be blended into each material, which increases material costs. Furthermore, laminating the materials on the back of the surface material requires time and effort, resulting in high manufacturing costs.

[0004] It has been discovered that cushioning is imparted to a tricot knitted fabric as a skin material by raising the back side to a specific thickness, making it possible to eliminate the need for soft polyurethane foam, and a highly recyclable and designable skin material for vehicle interiors has been disclosed. However, when the back side is raised and some of the fibers constituting the woven or knitted structure are cut, conformability to shape is improved, but stretchability is poor, making it insufficient for use as a skin material for vehicle interiors (Patent Document 1).

[0005] Also disclosed is a knitted fabric for construction materials in which loop pile is formed on at least one side of a mesh-like base material, giving it porosity and cushioning, and a method for manufacturing the same. When forming the loops, water-soluble fibers are interwoven into part of the knitted structure, and the water-soluble fibers are removed to form loops of a size within the vertical distance of the double knitted fabric. Such knitted fabrics are difficult to use with the surface exposed, and cannot be used as a covering material for vehicle interiors, which requires surface durability (Patent Document 2).

[0006] A circular knitted fabric is disclosed in which a soluble yarn is knitted using a circular knitting machine, and then dissolved and removed to form a pile, and the pile yarn forms a ground knitted fabric by knitting at least two consecutive loops. Since the pile surface is used as the surface, the yarn forming the pile yarn also forms the ground weave, and although the fabric is resistant to pile shedding, it has the disadvantage of being limited in fabric properties (Patent Document 3). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-068577 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-265345 [Patent Document 3] Japanese Patent Publication No. 139852 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in view of this technical background, and aims to provide a vehicle interior covering material that satisfies the physical property requirements and cushioning properties required for a seat covering material and is highly recyclable, even without laminating a soft urethane foam as a cushion layer on the back surface. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides the following means.

[0010] [1] A knitted fabric for vehicle interiors, The knitted fabric for vehicle interiors is a double jersey, and is characterized in that protrusions extending in the thickness direction of the knitted fabric beyond the thickness at the time of knitting are formed on the back side for each wale.

[0011] [2] The covering material for vehicle interiors according to the preceding paragraph 1, wherein the knitted fabric for vehicle interiors has a constant load elongation rate of 8.0% or more and a constant load set rate of 8.0% or less.

[0012] [3] The knitted fabric for vehicle interiors has cushioning properties, and the WC value in the KES compression characteristics is 4.0 gf*cm / cm 2 3. A skin material for vehicle interiors according to the preceding paragraph 1 or 2, wherein the RC value in the KES compression characteristics is 35.0% or more.

[0013] [4] The knitted fabric for vehicle interiors is knitted containing water-soluble fibers, and the method for manufacturing a skin material for vehicle interiors includes a knitting step using a double jersey circular knitting machine, a spreading step using a center cut, a step of dissolving the water-soluble fibers, and a heat setting step, wherein the heat setting step forms protrusions that are elongated in the thickness direction of the knitted fabric beyond the thickness at the time of knitting. [Effects of the Invention]

[0014] The invention of [1] is a double jersey fabric in which protrusions extending in the thickness direction of the knitted fabric are formed on the back side for each wale, which is thicker than the thickness at the time of knitting. Because it has excellent elasticity and cushioning properties and is sufficiently thick, it can be suitably used as a skin material for vehicle interiors without laminating flexible urethane foam on the back side. Compared to conventional flexible urethane foam laminated structures, it can be manufactured using a single material and is easily recycled. Since the flame retardant contained in flexible urethane foam is unnecessary and flammability can be ensured with the skin material alone, it is possible to provide a skin material for vehicle interiors with low environmental impact.

[0015] In the invention [2], since the constant load elongation rate is 8.0% or more and the constant load set rate is 8.0% or less, the material has sufficient stretchability, cushioning, and thickness, and good shape conformability, making it suitable for use as a seat covering material for vehicle interiors. The constant load elongation rate refers to the elongation rate when a constant load is applied after a certain period of time has passed, and the constant load set rate refers to the recovery rate after a certain period of time has passed since measuring the elongation rate. As a seat covering material, it has the function of following the deflection of the seat pad in response to the load applied when sitting and recovering when leaving the seat.

[0016] In the invention of [3], the WC value in the KES compression characteristics is 4.0 gf*cm / cm 2 Since the RC value in the KES compression characteristics is 35.0% or more, it has excellent cushioning properties and does not require lamination of soft urethane foam on the back side. Even when molded into relatively hard resin materials such as doors and instrument panels, it has a pleasant feel and can create a luxurious atmosphere in the interior of a car. As with the invention in [1], it is possible to provide a highly degradable and recyclable skin material for vehicle interiors. A soft feel is required for areas that are touched by the hands when riding in the car, such as doors and instrument panels, and an extremely thin soft urethane foam is sometimes laminated on the back side.

[0017] In the invention of [4], no protrusions are formed on the back side in the knitting process, and the protrusions are formed after the spreading process, so the grey fabric is easy to handle, and since no protrusions are formed during transportation, there is no risk of the fabric getting caught on the protrusions, and the spreading process can be carried out without any problems. By dissolving and removing the water-soluble fiber after knitting and spreading, the knitted fabric shrinks appropriately, and protrusions are formed on the back side that are elongated in the thickness direction of the knitted fabric more than the thickness at the time of knitting, and stretchability can also be imparted. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic cross-sectional view showing one embodiment of a knitted fabric for vehicle interior use according to the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing the knitted fabric for vehicle interior according to the present invention after knitting. [Figure 3]1 shows the knitting structure of the knitted fabric for vehicle interior use of Example 1. [Figure 4] 1 is an image of the knitted fabric for vehicle interior use of Example 1 taken from the back surface side. [Figure 5] FIG. 1 is a schematic cross-sectional view showing a conventional technique. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, an embodiment of a knitted fabric for vehicle interiors according to the present invention will be described with reference to the drawings.

[0020] The knitted fabric for vehicle interiors according to the present invention is a skin material used for automobile seats, doors, instrument panels, etc., and is a knitted fabric knitted by a double jersey knitting machine, and on the back side thereof, protrusions extending in the thickness direction of the knitted fabric beyond the thickness at the time of knitting are formed for each wale (see Figure 1).

[0021] By adopting such a configuration, it is possible to provide a skin material 1 for vehicle interiors that has increased thickness and cushioning properties and does not require laminating a soft urethane foam on the back surface side.

[0022] Fibers constituting the knitted fabric for vehicle interiors of the present invention include synthetic fibers and water-soluble fibers. Examples of synthetic fibers include polyester fibers, polyurethane fibers, and polypropylene fibers. These may be combined as appropriate. Among these, polyester fibers are preferred from the viewpoint of maintaining excellent weather resistance for automotive interior applications. Examples of water-soluble fibers include water-soluble polyvinyl alcohol fibers, water-soluble ethylene-vinyl alcohol copolymer fibers, and water-soluble polyamide fibers. Among these, water-soluble vinylon, a widely used water-soluble polyvinyl alcohol fiber, is preferred.

[0023] In the knitted fabric for vehicle interiors of the present invention, water-soluble fibers 5 are used as part of the fibers constituting the knitted fabric during grey knitting, as shown in Fig. 2. After grey knitting, the fabric undergoes a center-cut spreading process, whereby the water-soluble fibers 5 are dissolved to form protrusions 2 on the back surface, resulting in the product shown in Fig. 1.

[0024] Among the water-soluble fibers, water-soluble vinylon has the characteristic of shrinking before dissolving, and even if the water-soluble fiber is dissolved and removed, the density does not decrease and the strength of the structure can be ensured. In addition, protrusions that extend in the thickness direction of the knitted fabric beyond the thickness at the time of knitting are easily formed on the back side. See Figure 1.

[0025] Although dissolving and removing the water-soluble fibers may reduce the strength and thickness of the fabric, the use of a tuck weave in addition can ensure the fabric's strength, elasticity, and thickness. Furthermore, because the back yarns that form the protrusions on the back side are different from the surface yarns that weave the surface side, the fabric's properties can be easily changed. Changing the weave on the surface side also allows for greater design freedom and excellent design. Because the protruding surface is used as the back side, there is no need to worry about the protrusions coming off or becoming frayed due to external forces from the surface side. See Figure 3.

[0026] The gauge of the double jersey knitting machine is not particularly limited, but it is preferable to use a knitting machine with a gauge of 18 to 28 / inch. If the gauge is less than 18 / inch, the knitted fabric density will be coarse and the surface properties will be weak. Conversely, if the gauge is more than 28 / inch, the excessive density will cause severe wear by the sewing needle during sewing, making it more likely that thread breakage will occur at the seams, which is not preferable. The surface properties refer to fiber breakage and fluffing due to surface wear. Since the protrusions are formed on the back side, the surface properties tend to be good.

[0027] Furthermore, the number of courses on the knitting machine during double jersey knitting is preferably 30 to 50 courses per inch. If it is less than 30 courses per inch, the knitted fabric density will be coarse, the cushioning will be poor, and the surface physical properties will also be reduced. Conversely, if it exceeds 50 courses per inch, the stretch of the knitted fabric will decrease and the fabric will become stiff, which will make it more likely to wrinkle during sewing and may also reduce sewability, which is undesirable.

[0028] In the present invention, the thickness of the skin material is obtained by the protrusions formed on the back surface side, and the thickness is 2.0 mm or more. More specifically, by dissolving the water-soluble fibers interwoven during knitting, protrusions are formed on the back surface side that are elongated in the thickness direction of the knitted fabric more than the thickness at the time of knitting, thereby imparting thickness.

[0029] The protrusions must be formed on every wale. If they are formed on every wale, the shrinkage of the fabric will be weaker during the dissolution process of the water-soluble fiber, and protrusions that are more elongated in the thickness direction of the knitted fabric than at the time of knitting will not be formed, resulting in a deterioration in cushioning properties. In addition, the fabric density will increase, resulting in higher rigidity and lower stretchability. Protrusions may be formed on every 2 to 3 wales, but this may result in a relatively poorer cushioning properties.

[0030] The material for forming the protrusions is generally called polyester filament textured yarn, which is made by crimping the filament fibers that make up the yarn, and the strength of the crimping process is not important. The crimping process provides good cushioning and makes it easy to add thickness. Materials other than the water-soluble fiber and the protrusions can be selected appropriately depending on the design to be expressed, but polyester fiber is preferred.

[0031] The yarn count of the material that forms the protrusions can be determined based on the gauge of the knitted fabric used. For example, for a 20-gauge knitting machine, a range of 167 DTEX to 600 DTEX is appropriate for forming protrusions, and for a 24-gauge knitting machine, a range of 110 DTEX to 450 DTEX is appropriate. The single yarn fineness is selected depending on the yarn count, but if it is in the range of 1.1 DTEX to 6.9 DTEX, protrusions with cushioning properties can be formed. If it is less than 1.1 DTEX, the volume will decrease and cushioning protrusions may not be formed. Since the material that forms the protrusions does not appear on the surface side, white yarn that does not undergo a dyeing process can also be used. DTEX is used to refer to the thickness of the fiber in decitex.

[0032] On the other hand, the yarn count of the water-soluble fiber should be as small as possible so that it can be easily dissolved and removed, and is preferably 110 DTEX or less, and more preferably 56 DTEX or less.

[0033] Furthermore, the material used on the surface side can be a synthetic fiber such as polyester, regardless of its count or fineness, as long as it can ensure the surface durability required for a knitted fabric for vehicle interiors. The yarn count is preferably in the range of 110 DTEX to 500 DTEX, and the single yarn fineness can be appropriately selected from the range of 0.5 DTEX to 4.0 DTEX. Solution-dyed yarns may be used to reduce the number of dyeing processes and dyes. Since the yarn used on the surface side does not form protrusions on the back side, it is also possible to use solution-dyed blended yarns or glossy yarns, which offer a wide range of design possibilities.

[0034] The knitted fabric for vehicle interiors of the present invention has protrusions formed on the back surface of each wale, and preferably has a constant load elongation rate of 8.0% or more and a constant load set rate of 8.0% or less, making it suitable for use in areas where stretchability is required. For example, it can be suitably used as a seat covering material that requires conformability to the seat pad, or as a cover material for doors and instrument panels with complex shapes. If the constant load elongation rate is 8.0% or less, conformability to the shape decreases and the fabric is prone to wrinkling, while if the constant load set rate is 8.0% or more, the fabric will become doubled on the seat after the load is removed.

[0035] The compression characteristics of the knitted fabric for vehicle interiors of the present invention are as follows: WC value in KES compression characteristics is 4.0 gf*cm / cm 2 The above is preferable, and the RC value in the KES compression characteristics is preferably 35.0% or more. Because it has cushioning properties similar to that of the soft urethane foam laminated on the back side as a cushioning layer, it can be suitably used as a knitted fabric for vehicle interiors even without laminating a soft urethane foam.

[0036] The manufacturing process of the vehicle interior knitted fabric of the present invention comprises a knitting step on a double jersey circular knitting machine, a spreading step in which a part of the tubular vehicle knitted fabric is cut, called a center cut, a washing step in which the water-soluble fibers are dissolved and removed, and a heat setting step in a tenter dryer. By removing the water-soluble fibers after the spreading step, the handleability of the gray fabric is improved and the process passability is good.

[0037] As for the knitting machine, a double jersey circular knitting machine is used.

[0038] The process of dissolving and removing water-soluble fibers is best done with a tube-type liquid jet dyeing machine, as it can simultaneously shrink the density of the grey fabric. A continuous dyeing machine or a relaxer with a bath can also be used as long as it is capable of performing a boiling process at 60 to 90 degrees Celsius. The final density is then adjusted through a heat setting process using a tenter dryer, and the finished product is produced. [Example]

[0039] Next, specific examples of the present invention will be described, but the present invention is not limited to these examples. In the examples and comparative examples, polyester fiber was used as the knitting yarn, and the count etc. of the material used is shown in Table 1, and the knitting structure in Figure 3 shows the used parts. DTEX in the material composition column means decitex. The evaluation results are shown in Table 2. For the overall evaluation, a good score was given for all evaluation items, and an X was given for items with even one bad score.

[0040] Example 1 A 22-gauge, 33-inch double jersey knitting machine was used to knit the knitting structure shown in Figure 3 with the material composition listed in Table 1. The thickness immediately after knitting was 1.2 mm. After knitting, the fabric underwent a center-cut spreading process, and was then processed in a tube-type jet dyeing machine at 130°C for 30 minutes to dissolve and remove the water-soluble fibers and to shrink the gray fabric. It was then dried and heat-set in a tenter dryer at 160°C for 5 minutes to obtain a knitted fabric for vehicle interiors. The density of the resulting knitted fabric was 37 wales / inch, 33 courses / inch, and the weight was 445 g / m 2The thickness was 2.4 mm. The constant load elongation was 18.3% in the vertical direction and 22.7% in the horizontal direction, the constant load set rate was 3.2% in the vertical direction and 4.6% in the horizontal direction, the Taber abrasion was grade 3, and the KESWC value was 4.5 gf*cm / cm. 2 The KESRC value was 40.8%. The thickness, surface properties, stretchability, and cushioning were all good, and the overall evaluation was "Good."

[0041] <Example 2> In Example 1, the count of the yarn forming the protrusions on the back side and the surface yarn 2 were changed. The thickness immediately after knitting was 1.3 mm. The same processing as in Example 1 was carried out to obtain a knitted fabric for vehicle interiors. The density of the obtained knitted fabric was 37 wales / inch, 34 courses / inch, and the weight was 476 g / m 2 The thickness was 2.8 mm. The constant load elongation was 14.5% in the vertical direction and 16.2% in the horizontal direction, the constant load set rate was 2.6% in the vertical direction and 3.6% in the horizontal direction, the Taber abrasion was grade 3, and the KESWC value was 4.7 gf*cm / cm. 2 The KESRC value was 43.6%. The thickness, surface properties, stretchability, and cushioning were all good, and the overall evaluation was "Good."

[0042] Example 3 In Example 2, the weave was changed, and the formation of protrusions on the back side was changed every two wales. The thickness immediately after knitting was 1.3 mm. The same processing as in Example 1 was carried out to obtain a knitted fabric for vehicle interiors. The density of the obtained knitted fabric was 38 wales / inch, 35 courses / inch, and the weight was 465 g / m 2 The thickness was 2.7 mm. The constant load elongation was 16.5% in the longitudinal direction and 18.7% in the transverse direction, the constant load set rate was 2.8% in the longitudinal direction and 3.7% in the transverse direction, the Taber abrasion was grade 3, and the KESWC value was 4.6 gf*cm / cm. 2 The KESRC value was 42.6%. The thickness, surface properties, stretchability, and cushioning were all good, and the overall evaluation was "Good."

[0043] <Comparative Example 1> In Example 1, the structure was changed so that the number of protrusions formed on the back side was formed on all wales. The thickness immediately after knitting was 1.4 mm. The same processing as in Example 1 was carried out to obtain a knitted fabric for vehicle interiors. The density of the obtained knitted fabric was 35 wales / inch, 32 courses / inch, and the weight was 535 g / m 2 The thickness was 2.3 mm. The constant load elongation was 6.8% in the vertical direction and 7.6% in the horizontal direction, the constant load set rate was 1.8% in the vertical direction and 2.6% in the horizontal direction, the Taber abrasion was grade 3, and the KESWC value was 4.8 gf*cm / cm. 2 The KESRC value was 44.5%. The thickness and surface properties were good, but the fabric became hard and the elongation rate worsened. The basis weight also increased, which created price issues, and the overall rating was "X".

[0044] <Comparative Example 2> In Example 1, the water-soluble fiber was changed to polyester filament textured yarn. The thickness immediately after knitting was 1.2 mm. The same processing as in Example 1 was carried out to obtain a knitted fabric for vehicle interiors. The density of the obtained knitted fabric was 34 wales / inch, 32 courses / inch, and the weight was 395 g / m 2 The thickness was 1.4 mm. The constant load elongation was 22.8% in the vertical direction and 26.8% in the horizontal direction, the constant load set rate was 3.6% in the vertical direction and 5.8% in the horizontal direction, the Taber abrasion was grade 4, and the KESWC value was 2.3 gf*cm / cm. 2 The KESRC value was 28.5%. Because protrusions could not be formed on the back side, the cushioning properties were poor. The overall evaluation was "X".

[0045] <Comparative Example 3> In Example 1, the formation of protrusions on the back side was changed every four wales. The thickness immediately after knitting was 1.1 mm. The same processing as in Example 1 was carried out to obtain a knitted fabric for vehicle interiors. The density of the obtained knitted fabric was 38 wales / inch, 34 courses / inch, and the weight was 428 g / m 2 The thickness was 1.6 mm. The constant load elongation was 21.2% in the longitudinal direction and 24.6% in the transverse direction, and the constant load set rate was 4.2% in the longitudinal direction and 4.9% in the transverse direction. The Taber abrasion was grade 3, and the KESWC value was 3.6 gf*cm / cm. 2The KESRC value was 33.6%. The thickness was insufficient, and although the surface properties and elasticity were good, the cushioning properties were poor. The overall evaluation was "X".

[0046] <Reference example 1> To compare the compression characteristics of flexible urethane foam with those of the present invention, a flexible urethane foam (product number EL-67F, 2.0 mm thick) manufactured by Inoac Corporation, which is commonly used for automotive interior materials, was prepared and the KES compression characteristics were measured. The KESWC value was 4.9 gf*cm / cm. 2 , the KESRC value was 43.2%.

[0047] [Table 1]

[0048] The knitted fabric for vehicle interiors obtained as described above was evaluated according to the following evaluation methods.

[0049] <Thickness measurement method> The cross section of the skin material in the width direction was observed using a microscope (Keyence Corporation, Digital Microscope VHX-6000), and the total thickness of the skin material after knitting and the product was measured.

[0050] <Stretchability measurement method> The constant-load elongation and set rate were measured using a constant-load elongation tester manufactured by Daiei Scientific Instruments Co., Ltd. Three 80mm wide, 250mm long test pieces were prepared in each direction. The grip spacing was 150mm, and a load of 10kgf (98.1N) was applied to the bottom. After 10 minutes, the gauge length was measured and recorded, and the load was then removed. The gauge length was measured again 10 minutes after the load was removed, and the constant-load elongation (%) and constant-load set rate were calculated using the following formula, with the average values ​​of the three pieces being used as the data. Constant load elongation (%) = [(L1-L0) / L0] x 100 Constant load set rate (%) = [(L2-L0) / L0] x 100 L0: Gauge length before test (mm) L1: Gauge distance (mm) after applying load for 10 minutes L2: Gauge distance (mm) 10 minutes after unloading (Judgment criteria) A constant load elongation of 8.0% or more was considered acceptable, and a constant load set rate of 8.0% or less was considered acceptable.

[0051] <Surface property evaluation method> The test was conducted under the following conditions using a Taber abrasion tester specified in JIS1096G-2010. The degree of abrasion on the surface of each test piece was visually inspected, and the change in the appearance of the knitted fabric surface was evaluated according to the following criteria. A rating of "Grade 3" or higher was considered a pass. Abrasion wheel No. CS-10 was used, load: 4.9N, test rotation speed: 1000 times, rotational friction speed: approximately 70 rpm / min. (Judgment criteria) "Grade 5"... No abnormalities. "Grade 4"...Slightly damaged. "Grade 3": Damage is observed but no broken threads are found. "Grade 2": Thread breakage is observed. "1st grade": The threads are worn out and the fabric is exposed.

[0052] <Cushioning evaluation method> In the compressibility test using an automated pure bending tester KES-FB3 manufactured by Kato Tech Co., Ltd., WC (compression energy) is the amount of work required to achieve maximum pressure; the larger this value, the easier it is to undergo compressive deformation; RC (compression resilience) indicates the recovery of a fiber fabric when compressed; the closer the value is to 100, the better the recovery from compressive deformation. The compression properties were measured as follows. First, a knitted fabric was placed on a test stand as a sample, and a 2 cm2 area was measured. 2 A copper pressure probe with a circular flat surface was applied from above the sample at a speed of 0.002 cm / sec and a maximum compressive stress of 50 gf / cm. 2 The specimen is compressed under the following conditions: WC value (compression energy) and RC value (compression resilience) are calculated based on the measurement data through numerical processing. As a reference example, compression data was measured for a soft urethane foam (product number: EL-67F, manufactured by Inoac Corporation) with a thickness of 2.0 mm, and the evaluation criteria were determined as follows. (Judgment criteria) WC value: 4.0gf*cm / cm 2 And above, RC value: 35% or more was considered a pass.

[0053] [Table 2]

[0054] As is clear from Table 2, the knitted fabrics for vehicle interiors of Examples 1 to 3 according to the present invention were skin materials for vehicle interiors that did not require laminating polyurethane foam on the back side because they were highly stretchable and had excellent cushioning properties due to the thickness achieved by the knitting structure and yarn use. In contrast, the knitted fabric of Comparative Example 1 was thick but had poor stretchability and cushioning properties, the knitted fabric of Comparative Example 2 had no cushioning properties because no protrusions were formed on the back side, and the knitted fabric of Comparative Example 3 had stretchability but poor cushioning properties. [Industrial Applicability]

[0055] The knitted fabric for vehicle interiors according to the present invention does not require lamination of a soft urethane foam on the back side, and is excellent in stretchability and cushioning properties, so it is suitably used as a skin material for vehicle interiors. [Explanation of symbols]

[0056] 1. Skin material (skin material for vehicle interiors) 2. Back thread 1 (protruding thread) 3. Surface thread 1 4. Surface thread 2 5. Water-soluble fiber 6. Soft urethane foam 7. Lining material

Claims

1. A knitted fabric for vehicle interiors, The knitted fabric for vehicle interiors is a double jersey, and is characterized in that protrusions extending in the thickness direction of the knitted fabric beyond the thickness at the time of knitting are formed on the back surface side for each wale.

2. 2. A skin material for vehicle interiors according to item 1, wherein the knitted fabric for vehicle interiors has a constant load elongation rate of 8.0% or more and a constant load set rate of 8.0% or less.

3. The knitted fabric for vehicle interiors has cushioning properties, and the WC value in the KES compression characteristics is 4.0 gf*cm / cm ２ 3. The vehicle interior skin material according to claim 1, wherein the RC value in the KES compression characteristics is 35.0% or more.

4. The knitted fabric for vehicle interiors is knitted containing water-soluble fibers, and the method for manufacturing a skin material for vehicle interiors includes a knitting step using a double jersey circular knitting machine, a spreading step using a center cut, a step of dissolving the water-soluble fibers, and a heat setting step, wherein the heat setting step forms protrusions that are elongated in the thickness direction of the knitted fabric beyond the thickness at the time of knitting.

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