Imitated feather leather sheet-shaped object

Abstract

The standing-like leather sheet comprises a fibrous base material which is a textile fabric or a knitted fabric, and a resin applied to the fibrous base material, and is provided with a standing surface having standing hair to which the resin adheres, on the surface of the standing-like leather sheet. The number of weave points per 24.5 mm square of the threads constituting the fibrous base material is between 1,500 and 1,000,000 in the case of a textile fabric, and between 3,000 and 9,000 in the case of a knitted fabric, and the number of weave points per 24.5 mm square of the threads constituting the fibrous base material is between 1,500 and 1,000,000 in the case of a knitted fabric. The total number of fibers involved in crossing or winding at each 25.4 mm square weave point is 396, 000-2,640,000 in the case of a textile fabric, and is 912, 000-8, 208,000 in the case of a braided fabric, and the total number of fibers involved in crossing or winding at each 25.4 mm square weave point is 396, 000-2,640,000 in the case of a knitted fabric. The dead-load elongation is more than 5%, and the dead-load setting rate is less than 10%.

Description

Technical Field

[0001] The invention relates to a simulated suede leather sheet. Background Art

[0002] Leather-like sheets are used for vehicle interior materials such as seats and door linings, home furnishing materials such as furniture and chairs, and fashion purposes such as bags and shoes. Leather-like sheets are produced by applying a polymer elastomer to a nonwoven fabric generally formed of ultrafine fibers. Leather-like sheets obtained by applying a resin to a woven fabric or a textile as a fiber base are known (see Patent Documents 1 and 2).

[0003] Patent document 3 discloses an artificial leather obtained by applying a polymer elastomer to a fiber entanglement body formed by three-dimensionally entangled ultrafine fibers and textiles, and having a standing nap length of 200 to 600 μm and a density of 0.50 to 0.85 g / cm 3 Furthermore, it is disclosed that: thereby, an artificial leather having a dense structure and a high-quality surface appearance and excellent mechanical properties and morphological stability is provided.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2022-027095

[0007] Patent Document 2: Japanese Patent Application Publication No. 2013-147758

[0008] Patent Document 3: Japanese Patent Application Publication No. 2019-112744 Summary of the invention

[0009] In the artificial leather of Patent Document 3, the ultrafine fibers having a relatively short fiber length constituting the fiber winding body are fixed and bonded by a high molecular weight elastic body as a binder, so that there are problems such as hair loss due to abrasion and deterioration of surface followability.

[0010] On the other hand, in order to solve the above problems, when a woven fabric is used as the fibrous base material, the density of the raised naps is inferior compared to a filament winding body or a nonwoven fabric, or the texture of the woven fabric appears on the surface, resulting in a slightly poor surface appearance.

[0011] The present invention has been made in view of the above-mentioned current situation, and an object of the present invention is to provide a simulated napped leather sheet having a good surface appearance, good hair removal resistance and good surface followability, even though a woven or knitted fabric is used as a fiber base material.

[0012] The present invention includes the embodiments given below.

[0013] [1] A fleece-like leather sheet, comprising: a fibrous substrate which is a textile or a woven fabric, and a resin applied to the fibrous substrate, wherein the fleece-like leather sheet is characterized in that the surface of the sheet has a fleece surface having fleeces, the fleeces being formed by fibers constituting the fibrous substrate and to which the resin is attached, and the number of tissue points constituting the threads of the fibrous substrate in each 24.5 mm square of the sheet is 1,500 to 10,000 when the fibrous substrate is a textile, and the number of tissue points in the fibrous substrate is 1,500 to 10,000 when the fibrous substrate is a woven fabric. When the fibrous base material is a woven fabric, the total number of fibers crossing or entangled at the tissue point in each 24.5 mm square sheet is 396,000 to 2,640,000 when the fibrous base material is a textile, and is 912,000 to 8,208,000 when the fibrous base material is a woven fabric. The constant load elongation is more than 5% in the warp and weft directions of the sheet, and the constant load setting rate is less than 10% in the warp and weft directions of the sheet.

[0014] [2] The imitation napped leather sheet according to [1], characterized in that

[0015] When the fibrous base material is a woven fabric, the number of tissue points constituting the threads of the fibrous base material per 24.5 mm square sheet is 3,500 to 9,000.

[0016] [3] The imitation napped leather sheet according to [1] or [2], characterized in that:

[0017] The fibrous substrate is a circular woven fabric.

[0018] [4] The imitation napped leather sheet according to [1] or [2], characterized in that:

[0019] The fibrous base material is a double-sided woven fabric.

[0020] [5] The imitation napped leather sheet according to [1] or [2], characterized in that:

[0021] The fibrous substrate is a satin woven multi-textile.

[0022] [6] The imitation napped leather sheet according to any one of [1] to [5], characterized in that

[0023] The resin is present at least on the surface side where the erected naps are present in the thickness direction of the fibrous base material.

[0024] [7] The imitation napped leather sheet according to any one of [1] to [6], characterized in that

[0025] The resin is a single polyurethane resin, or a mixture of a silicone resin and a polyurethane resin.

[0026] [8] The imitation napped leather sheet according to any one of [1] to [7], characterized in that

[0027] No upright naps are formed on the back side of the sheet-like material, and a backing is provided on the back side.

[0028] [9] The imitation napped leather sheet according to [8], characterized in that:

[0029] The backing includes a flame retardant and a binder resin.

[0030]

[10] The imitation napped leather sheet according to any one of [1] to [9], characterized in that

[0031] Regarding the density of the fibrous substrate, when the fibrous substrate is a woven fabric, the warp density is 200 to 500 strands / 25.4 mm and the weft density is 50 to 150 strands / 25.4 mm. When the fibrous substrate is a knitted fabric, the density of the fibrous substrate is 40 to 110 horizontal rows / 25.4 mm and 30 to 70 vertical rows / 25.4 mm.

[0032] Here, the "organization point" refers to a point where the threads constituting the fibrous substrate intersect or entangle. That is, when the fibrous substrate is a woven fabric, the organization point refers to a point where the warp and weft intersect. In addition, when the fibrous substrate is a knitted fabric, the organization point refers to a loop obtained by winding a sinker loop and a needle loop, and the organization point is calculated by taking each loop as one point.

[0033] Effects of the Invention

[0034] According to the embodiment of the present invention, it is possible to provide a simulated napped leather sheet having a good surface appearance and excellent hair shedding resistance and surface followability, even though a woven or knitted fabric is used as a fiber base material. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a schematic cross-sectional view of a simulated suede leather sheet according to one embodiment.

[0036] Figure 2 This is a weaving structure diagram of the satin weave (7-weave satin) of Example 1.

[0037] Figure 3 Schematic diagram showing the weaving points of a knitted fabric.

[0038] Figure 4 This is a structural diagram of the terry structure of Example 13.

[0039] Figure 5 This is a conceptual diagram showing the knitting structure of the surface of a terry texture.

[0040] Figure 6 This is the organizational diagram of the MOCKRODY organization of Example 16.

[0041] Figure 7 This is a conceptual diagram of a test piece for explaining a fatigue durability test method.

[0042] Figure 8 This is a conceptual diagram of a test piece for explaining a fatigue strength test method.

[0043] Fig. 9 This is a woven structure diagram of 5-satin weave of Example 10.

[0044] Fig.10 This is a textile structure diagram of 6 satin weaves of Example 11.

[0045] Fig.11 This is a textile structure diagram of 8 satin weaves of Example 12.

[0046] Fig.12 This is a structural diagram of the tuck structure of Comparative Example 4.

[0047] Fig.13 This is a conceptual diagram showing the knitting structure of the surface of the tuck stitch. DETAILED DESCRIPTION

[0048] The imitation nap leather sheet (hereinafter also referred to as "sheet") involved in this embodiment is an imitation nap leather sheet including a fibrous substrate as a textile or knitted fabric and a resin applied to the fibrous substrate. The sheet has a nap surface with naps on the surface of the sheet, and the naps are formed by fibers constituting the fibrous substrate and the resin is attached. The "surface" of the sheet refers to the surface (design surface) that is visible during use of the sheet, of the surface and the back of the sheet.

[0049] Figure 1 The figure schematically shows a cross-sectional view of an imitation nap leather sheet 10 according to one example. The sheet 10 has a fibrous base material 12 which is a textile or a knitted fabric. In this example, a resin (not shown) is applied to the entire fibrous base material 12. The surface 11 of the sheet 10 is provided with naps 14 formed by fibers constituting the textile or knitted fabric of the fibrous base material 12. A resin is attached to the fiber surface of the naps 14. A nap surface 16 is formed on the surface 11 of the sheet 10, and the nap surface 16 has the naps 14 to which the resin is attached. No naps are formed on the back surface 13 of the sheet 10.

[0050] In this embodiment, the fibrous substrate is a textile or a knitted fabric. Therefore, compared with the case where a nonwoven fabric is used, hair removal caused by abrasion can be suppressed, and surface followability can be improved. In one embodiment, the fibrous substrate is preferably composed only of a textile or a knitted fabric.

[0051] Surface conformability refers to the ease with which a sheet can conform to the shape of an object when it is used as a surface material and attached to the surface of the object. Specifically, it refers to the ability to appropriately stretch the sheet due to tension when the sheet is attached to the seat, and to prevent wrinkles from forming due to insufficient recovery of the stretch caused by tension after attachment. Therefore, a sheet with good surface conformability is less likely to wrinkle when attached to the surface of an object.

[0052] As the textile, for example, plain weave, twill weave, and satin weave can be mentioned. Among them, satin weave is preferred, and for example, 5-weave satin, 6-weave satin, 7-weave satin, 8-weave satin, and 12-weave satin can be mentioned. The textile may be a single-layer textile or a multi-layer textile. Preferably, it is a single-layer textile, a double-sided textile using a top thread and a back thread as warp threads, or a triple-sided textile using a top thread, a middle thread, and a back thread as warp threads. When the fibrous substrate is a textile, a multi-layer textile of satin weave is preferably used, and a double-sided textile of 5-weave satin or 7-weave satin is more preferably used.

[0053] The fibrous base material is preferably a woven fabric. From the viewpoint of surface followability, the fibrous base material is more preferably weft knitted, and further preferably circular knitted. In addition, it is preferably a knitting structure in which connected threads form needle loops and are knitted into the surface thread and the back thread. As such a knitting structure, double-sided knitting can be cited, and among the double-sided knitting, for example, terry structure and mockrody structure can be cited as preferred examples. If it is such a knitting structure, the filling rate of the thread in the needle loop is increased, and the needle loop is not easily deformed. Therefore, the effect of improving fatigue durability and fatigue strength can be improved. In addition, the increase in the constant load setting rate can be suppressed, and the effect of improving surface followability can be improved.

[0054] The fibrous substrate may be a substrate colored with a dye or a pigment, or may be an uncolored substrate.

[0055] The fiber raw material constituting the fibrous substrate is not particularly limited, and conventionally known natural fibers, regenerated fibers, semisynthetic fibers, synthetic fibers, etc. can be used. These raw materials can be used alone or in combination of two or more. Among them, from the viewpoint of durability, especially mechanical strength, heat resistance, and light resistance, the fiber raw material is preferably a synthetic fiber, more preferably a polyester fiber, and particularly preferably a polyethylene terephthalate fiber.

[0056] As a fibrous substrate, a fibrous substrate having upright hairs on the surface, i.e., a fibrous substrate having an upright hair surface, is used. Upright hairs are formed on at least one side of the fibrous substrate. Preferably, upright hairs are formed only on one side of the fibrous substrate. The upright hairs are formed by fibers constituting a textile or a woven fabric, and are constrained by a textile structure or a woven structure. Therefore, the effects of improving hair removal resistance, abrasion resistance, and surface tracking performance can be improved. Upright hairs refer to hairs (fluff) provided on the surface of a fibrous substrate, also referred to as hairy. For example, the upright hairs can be formed by opening or raising the woven structure.

[0057] The fineness of the fibers constituting the napped fibers (single fiber fineness) is not particularly limited, but is preferably 0.1 to 0.5 dtex, and more preferably 0.1 to 0.4 dtex. A single fiber fineness of 0.1 dtex or more provides good abrasion resistance. A single fiber fineness of 0.5 dtex or less is beneficial for improving surface appearance and touch.

[0058] The fineness (linear fineness) of the thread constituting the fibrous substrate is not particularly limited, but is preferably 50 to 250 dtex, more preferably 50 to 200 dtex. When the linear fineness is 50 dtex or more, the effect of improving abrasion resistance, hair removal resistance, fatigue durability, and fatigue strength can be improved. When the linear fineness is 250 dtex or less, the effect of improving the surface appearance and feel can be improved.

[0059] The thickness of the fibrous substrate is not particularly limited, and may be, for example, 600 to 1500 μm. More specifically, when the fibrous substrate is a textile, the thickness of the fibrous substrate is preferably 600 to 1500 μm, and more preferably 800 to 1200 μm. When the fibrous substrate is a woven fabric, the thickness of the fibrous substrate is preferably 600 to 1400 μm, more preferably 600 to 1300 μm, and further preferably 800 to 1200 μm. When the thickness of the fibrous substrate is above the lower limit, the effect of improving abrasion resistance, hair removal resistance, fatigue durability, and fatigue strength can be improved. When the thickness of the fibrous substrate is below the upper limit, the effect of improving the feel can be improved.

[0060] The thickness of the fibrous substrate is a value measured using a constant pressure thickness gauge (eg, Peacock micrometer H-30 manufactured by Ozaki Seisakusho Co., Ltd.) in accordance with JIS L1096:2010 8.4A method (JIS method), and is a value including the napped portion.

[0061] It should be noted that the above-mentioned single fiber fineness, linear fineness and thickness of the fibrous substrate are the single fiber fineness, linear fineness and thickness of the fibrous substrate before the resin is applied. The single fiber fineness, linear fineness and thickness of the suede-like leather sheet after the resin is applied (i.e., the thickness of the suede-like leather sheet) can be set within the same range.

[0062] The resin applied to the fibrous substrate adheres to the surface of the fibers constituting the fibrous substrate. By applying the resin to the fibrous substrate, the surface of the imitation suede leather sheet can be made smooth, thereby obtaining a sheet with a good hand feel.

[0063] The resin is present at least on the surface side where the naps are present (i.e., the nap surface side) in the thickness direction of the fibrous substrate, so as to impart good hand feel and wear resistance. The resin may be present in the entire thickness direction of the fibrous substrate. In this case, the resin does not cover the entire nap surface of the fibrous substrate in a film-like manner (i.e., it is not imitation grain leather), but is applied to the fibrous substrate in a manner that the naps remain. Thus, an imitation nap leather sheet having the appearance and touch of suede or nubuck is obtained.

[0064] As the resin applied to the fibrous substrate, for example, there can be mentioned: silicone resin, polyurethane resin, polyester resin, acrylic resin, etc. These resins can be used alone or in the form of a mixture of two or more. Among them, from the viewpoint of hand feel, silicone resin is preferably used, from the viewpoint of wear resistance, polyurethane resin is preferably used, and a mixture of them is more preferably used. By using silicone resin to give smoothness to the surface of the sheet, it has a good hand feel, and in addition, the load applied to the tissue point by wear can be reduced. In addition, the use of polyurethane resin can prevent the silicone resin from falling off during the manufacturing process, so that the above-mentioned effect brought by the silicone resin can be fully exerted.

[0065] The silicone resin is not particularly limited, and examples thereof include methyl hydrogen silicone resin, amino modified silicone resin, (meth) acrylic modified silicone resin, etc. These resins can be used alone or in combination of two or more. Among them, methyl hydrogen silicone resin is preferred from the viewpoint of abrasion resistance and hand feel. Here, (meth) acrylic modified silicone resin refers to acrylic modified silicone resin and / or methacrylic modified silicone resin.

[0066] Examples of polyurethane resins include polyether polyurethane resins, polyester polyurethane resins, polycarbonate polyurethane resins, etc. These resins can be used alone or in combination of two or more. Among them, polycarbonate polyurethane resins are preferred from the viewpoint of wear resistance.

[0067] The mass ratio (in terms of solid amount) of the silicone resin and the polyurethane resin applied to the fibrous substrate is not particularly limited. For example, the silicone resin:polyurethane resin ratio may be 1:2 to 1:52, or 1:2 to 1:40.

[0068] Various additives such as catalysts, matting agents, lubricants (such as silicone oil), surfactants, fillers, leveling agents, tackifiers, crosslinking agents, and penetrants may be added to the above resins within a range that does not impair the effects of the present embodiment.

[0069] The amount of resin adhered to the fibrous substrate is not particularly limited. In one embodiment, the amount of resin adhered to the fibrous substrate is preferably 10 g / m2 in terms of solid amount from the viewpoint of abrasion resistance and hair removal resistance. 2 In addition, from the viewpoint of hand feel, 40 g / m 2 The adhesion amount is more preferably 15 to 25 g / m2 in terms of solid amount. 2 Here, the amount of the above-mentioned additives is not included in the amount of the resin attached. In addition, the amount of the resin attached does not include the amount of the resin contained in the backing described later. That is, it is considered that the above-mentioned resin applied at least to the surface side where the upright hairs exist in the thickness direction of the fibrous substrate is distinguished as the first resin from the adhesive resin (second resin) contained in the backing applied only to the back of the sheet. Accordingly, the amount of the resin attached is the amount of the first resin attached to the fibrous substrate.

[0070] The filling rate of the resin (first resin) for the fibrous substrate is not particularly limited. In one embodiment, the filling rate of the resin for the fibrous substrate is preferably 0.5-2.8% in the napped portion, more preferably 0.5-2.5%, and preferably 3-9% in the base tissue portion. By being above the lower limit, the effect of improving the wear resistance and the resistance to depilation can be improved. By being below the upper limit, a good hand feel is easily obtained. Here, the filling rate of the resin is: the ratio of the resin cross section per unit area at the cross section of the napped portion or the base tissue portion of the sheet. The napped portion refers to: the area where the napped portion exists in the thickness direction of the sheet. The base tissue portion refers to: the main body of the fibrous substrate constituting the textile tissue or the woven tissue below the napped portion.

[0071] The density of the fibrous substrate is not particularly limited. When the fibrous substrate is a textile, the density of the fibrous substrate is preferably: a warp density of 200 to 500 strands / 25.4 mm, and a weft density of 50 to 150 strands / 25.4 mm. More preferably, the warp density is 250 to 400 strands / 25.4 mm, and the weft density is 50 to 100 strands / 25.4 mm. When the fibrous substrate is a woven fabric, the density of the fibrous substrate is preferably 40 to 110 coil rows / 25.4 mm, and 30 to 70 coil wales / 25.4 mm. More preferably, it is 60 to 90 coil rows / 25.4 mm, and 30 to 50 coil wales / 25.4 mm. When the density of the fibrous substrate is above the lower limit, it is easy to obtain an excellent surface appearance in which the texture of the textile or woven fabric is not visible. In addition, it is beneficial to improve the touch, abrasion resistance, hair removal resistance, fatigue durability, and fatigue strength. When the density of the fibrous substrate is below the upper limit, a good hand feel is easily obtained. It should be noted that the above density of the fibrous substrate is the density of the imitation suede leather sheet after the resin is applied. The density before the resin is applied can be set within the same range as above.

[0072] In the present embodiment, the number of tissue points constituting the lines of the fibrous substrate in the sheet per unit area is set as follows. That is, the number of tissue points in each 24.5 mm square sheet is 1,500 to 10,000, preferably 1,800 to 7,000, more preferably 2,000 to 4,500, and can be 3,000 to 7,000 when the fibrous substrate is a woven fabric. In addition, the number of tissue points in each 24.5 mm square sheet is 3,000 to 9,000, preferably 3,500 to 9,000, more preferably 3,500 to 7,700, further preferably 4,000 to 6,000, particularly preferably 4,500 to 5,500, and can be 3,500 to 5,500. By making the tissue point above the lower limit, the density of the fibrous substrate is increased, so that the excellent surface appearance and good touch of the tissue texture of the textile or knitted fabric are not visible, and the wear resistance, hair removal resistance, fatigue durability, fatigue strength, and surface tracking are excellent. By making the tissue point below the upper limit, it has a good feel. It should be noted that the number of tissue points mentioned above is the number of tissue points in the imitation suede leather sheet after the resin is applied. The number of tissue points before the resin is applied can be set within the same range as above.

[0073] In this specification, "a sheet of 24.5 mm square" means: a square area of ​​25.4 mm in the warp direction and 25.4 mm in the weft direction (25.4×25.4 mm 2). The so-called warp and weft directions of a sheet-like article refer to the directions in which the warp and weft threads pass through a woven fabric, respectively, and refer to the length direction and width direction of a woven fabric, respectively.

[0074] In the case where the fibrous substrate is a textile, the weave point is the point where the warp and weft threads intersect as described above. For example, Figure 2 In the complete structure of the 7-weave satin double-sided fabric shown, the structure points are the points represented by white in the column of warp threads (front threads) displayed as "front" and the points represented by black in the column of warp threads (back threads) displayed as "back".

[0075] In the case of woven fabrics, the number of tissue points per 24.5 mm square is calculated using the following formula (1).

[0076] [Mathematical formula 1]

[0077]

[0078] In the formula, n represents the number of weaves of the n-layer weave, for example, an integer of 1 to 3. In the case of a single-layer woven fabric, n=1, in the case of a double-layer woven fabric, n=2, and in the case of a triple-layer woven fabric, n=3.

[0079] A k represents the warp density of the kth warp (root / 25.4 mm). k In the case of a single-layer textile, the warp density of the textile is directly indicated. In the case of a double-sided textile, the kth warp represents the top or back yarn, A1 represents the warp density of the top (first warp), and A2 represents the warp density of the back (second warp). In the case of a triple textile, the kth warp represents the top, middle or back yarn, A1 represents the warp density of the top (first warp), A2 represents the warp density of the middle (second warp), and A3 represents the warp density of the back (third warp).

[0080] B k The number of intersections between each k-th warp and the weft in the repeating unit of the weft (number / root) can be solved based on the organization diagram of the textile organization. Here, the repeating unit of the weft refers to the number of wefts that form a complete organization, which can be solved based on the organization diagram of the textile organization. For example, Figure 2 In the case of the weave diagram shown, the repeating unit of the weft is 14 strands, and the number of B1 and B2 is 2 strands each.

[0081] C represents the weft density (roots / 25.4 mm) and D represents the repeating unit of the weft (roots).

[0082] When the fibrous base material is a knitted fabric, the weaving point refers to the loops obtained by winding the sinker loops and the needle loops as described above. Figure 3 The portion surrounded by the dotted line is a loop (organization point) obtained by winding the sinker loop and the needle loop, and the organization point is calculated by taking each loop as 1 point.

[0083] In the case of knitted fabrics, the calculation formula for the tissue points is different depending on the knitting structure, so the calculation formula for the tissue points is derived from each tissue diagram, and the number of tissue points is calculated from the obtained calculation formula. For example, in the case of double-sided knitting, the number of tissue points per 24.5 mm square is calculated using the following formula (2).

[0084] [Mathematical formula 2]

[0085] Organization points (pcs / 25.4mm square) = (G F ×H F )×(I F ×J F )+(G R ×H R )×(I R ×J R ) (2)

[0086] In the formula, G F Indicates the surface coil row density (pcs / 25.4mm). F Indicates the existence probability of tissue points in the longitudinal direction (length direction) of the surface. F Indicates the surface coil wale density (pcs / 25.4mm). F Indicates the existence probability of tissue points in the latitudinal direction (width direction) of the surface. R Indicates the row density of the back side stitches (pcs / 25.4mm). R Represents the probability of existence of tissue points in the warp direction on the back side. R Indicates the density of coil wales on the back (pcs / 25.4mm). R Indicates the probability of existence of tissue points in the latitudinal direction on the back side.

[0087] For example, in the case of a terry weave, the weave diagram is Figure 4 The woven structure seen from the surface is simply Figure 5 In this case, the probability of the existence of the tissue point in the meridian direction of the surface is H F ,like Figure 5 As shown, in the warp direction, there is a tissue point in the 3-stitch row of 3 stitches, that is, in G F G F There is an organization point, so H F =G F / G F The probability H of the existence of the tissue point in the warp direction on the back side is R Similarly, HR =G R / G R . The probability of existence of tissue points in the latitudinal direction of the surface J F ,like Figure 5 As shown, in the weft direction, there are organization points in the three wale rows of three coils, that is, in I F I F There is an organization point, so J F =I F / I F . The probability of existence of tissue points in the latitudinal direction on the back side J R Similarly, J R =I R / I R Therefore, the number of weaving points in the case of a pile weave is expressed by the following formula (2-1).

[0088] [Mathematical formula 3]

[0089]

[0090] In the case of the MOCKRODY organization, the organization chart begins with Figure 6 According to the organization diagram, on the surface, the surface lines and the connecting lines alternately form rows or wales of stitches. In addition, on the back, the back lines and the connecting lines alternately form rows or wales of stitches. According to the organization diagram, there is a probability H F , J F , H R , J R Same as the case of terry weave, i.e., H F =G F / G F , J F =I F / I F , H R =G R / G R , J R =I R / I R Therefore, the number of tissue points in the case of MOCKRODY tissue is expressed by the above formula (2-1).

[0091] In the present embodiment, the total number of fibers participating in the crossing or entanglement at the above-mentioned tissue point in the sheet-like material per unit area (hereinafter also referred to as "the number of fibers at the tissue point") is set as follows. That is, when the fibrous substrate is a textile, the total number of fibers participating in the crossing at the tissue point in the sheet-like material per 24.5 mm square is 396,000 to 2,640,000, preferably 500,000 to 1,848,000, more preferably 700,000 to 1,500,000, and even more preferably 800,000 to 1,300,000. In addition, when the fibrous base material is a woven fabric, the total number of fibers involved in entanglement at the tissue point per 24.5 mm square sheet is 912,000 to 8,208,000, preferably 1,050,000 to 7,022,400, more preferably 1,500,000 to 4,000,000, and further preferably 1,800,000 to 3,000,000. When the number of tissue point fibers is above the lower limit, the density of the standing hair is increased, so that the excellent surface appearance in which the tissue texture of the textile or woven fabric is not visible, the good touch, and the excellent surface tracking property are obtained. In addition, when the number of tissue point fibers is below the upper limit, the hand feel is good (no residual core). It should be noted that the above-mentioned number of tissue point fibers is the number in the imitation standing hair leather sheet after the resin is applied. The number of tissue point fibers before the resin is applied can be set within the same range as above.

[0092] Here, the number of fibers at the tissue point is: the number of fibers (also called single fibers) that constitute crossed or entangled lines in each tissue point existing in a sheet of 24.5 mm square is calculated, and the number of fibers is calculated by adding up the results obtained at all tissue points existing in the 24.5 mm square.

[0093] When the fibrous substrate is a woven fabric, the number of fibers at the weaving point is calculated using the following formula (3).

[0094] [Formula 4]

[0095]

[0096] In the formula, n, A k , B k , C and D are the same as in formula (1). k Indicates the number of single fibers in the kth warp. E kIn the case of a single-layer fabric, the number of single fibers of the warp is directly indicated. In the case of a double-sided fabric, E1 indicates the number of single fibers of the top thread (first warp), and E2 indicates the number of single fibers of the back thread (second warp). In the case of a triple-layer fabric, E1 indicates the number of single fibers of the top thread (first warp), E2 indicates the number of single fibers of the center thread (second warp), and E3 indicates the number of single fibers of the back thread (third warp). F indicates the number of single fibers of the weft.

[0097] When the fiber base material is a woven fabric, the calculation formula for the number of fibers at the weave point varies depending on the weave structure. Therefore, the calculation formula is derived from each weave diagram, and the number of fibers at the weave point is calculated from the obtained calculation formula. For example, in the case of a terry weave, according to Figure 4 In the tissue diagram shown, on the surface, both the sinker loop and the needle knitting loop form a coil through the surface line and the connecting line. Therefore, at the tissue point on the surface, the surface line and the connecting line that constitute the sinker loop and the surface line and the connecting line that constitute the needle knitting loop, a total of 4 fibers participate in the winding. Accordingly, the number of fibers participating in the winding at the tissue point on the surface is the sum of the number of single fibers of the above 4 lines. On the back, both the sinker loop and the needle knitting loop form a coil through the back line and the connecting line. Therefore, at the tissue point on the back, the back line and the connecting line that constitute the sinker loop and the back line and the connecting line that constitute the needle knitting loop, a total of 4 fibers participate in the winding. Accordingly, the number of fibers participating in the winding at the tissue point on the back is the sum of the number of single fibers of the above 4 lines.

[0098] Based on the above, in the case of a terry weave, the number of fibers at the weave point is calculated by the following formula (4-1).

[0099] [Mathematical formula 5]

[0100] Number of fibers at tissue point (roots / 25.4 mm square) = G F ×I F ×(K+L)×2+G R ×I R ×(M+L)×2 (4-1)

[0101] In the formula, G F ,I F , G R and I R Same as formula (2). K represents the number of single fibers in the surface line. L represents the number of single fibers in the connecting line. M represents the number of single fibers in the back line.

[0102] In the case of the MOCKRODY organization, according to Figure 6In the tissue diagram shown, at the tissue point on the surface, a total of two fibers, the surface line and the connecting line, participate in the entanglement. Therefore, the number of fibers participating in the entanglement at the tissue point on the surface is the sum of the number of single fibers of the above two lines. At the tissue point on the back, a total of two fibers, the back line and the connecting line, participate in the entanglement. Therefore, the number of fibers participating in the entanglement at the tissue point on the back is the sum of the number of single fibers of the above two lines. Based on the above content, in the case of MOCKRODY tissue, the number of fibers at the tissue point is calculated by the following formula (4-2).

[0103] [Mathematical formula 6]

[0104] Number of fibers at tissue point (roots / 25.4 mm square) = G F ×I F ×(K+L)+G R ×I R ×(M+L) (4-2)

[0105] In the formula, G F ,I F , G R and I R Same as formula (2). K represents the number of single fibers in the surface line. L represents the number of single fibers in the connecting line. M represents the number of single fibers in the back line.

[0106] The above-mentioned "number of single fibers" refers to the number of single fibers constituting the thread, for example, in the case of a multi-fiber thread, it refers to the number of fibers constituting the multi-fiber thread. In the case of a split thread, the number of single fibers refers to the number of single fibers after splitting.

[0107] In the imitation standing pile leather sheet involved in this embodiment, the length of the standing pile in the standing pile surface is preferably set to 200 to 500 μm. That is, the length of the standing pile in the state of being attached with the above-mentioned resin is preferably 200 to 500 μm. By the length of the standing pile being 200 μm or more, the effect of improving the surface appearance, wear resistance, and touch can be improved. In addition, by the length of the standing pile being 500 μm or less, the effect of improving the wear resistance can be improved. The length of the standing pile is more preferably 250 μm or more, further preferably 300 μm or more, and preferably 400 μm or less.

[0108] More specifically, when the fibrous substrate is a woven fabric, the length of the standing hairs is more preferably 200 to 400 μm. When the fibrous substrate is a knitted fabric, the length of the standing hairs is more preferably 200 to 500 μm, further preferably 250 to 500 μm, further preferably 250 to 400 μm, and particularly preferably 300 to 400 μm.

[0109] The above-mentioned nap length is the length of the nap in the imitation nap leather sheet after the resin is applied. The length of the nap before the resin is applied can be set within the same range as above.

[0110] The length of the standing hair is measured as follows. That is, before the measurement, the standing hair surface is stroked three times in the reverse direction of the grain by hand to make the hair stand up, and then the length of the standing hair (the length from the root of the hair to the tip of the hair) is measured. For the measurement, a vertical cross-section of the imitation standing hair leather sheet is observed at 100 times using a microscope (for example, VHX-200 / 100F manufactured by Keyence Co., Ltd.), and the length of any 10 standing hairs is measured, and the average value is calculated. Here, the reverse direction is the direction opposite to the along direction, and the along direction is the direction in which the standing hairs fall.

[0111] Regarding the imitation suede leather sheet involved in this embodiment, the constant load elongation of the sheet in the warp direction and the weft direction is 5% or more. That is, the constant load elongation of the sheet in the warp direction is 5% or more, and the constant load elongation in the weft direction is 5% or more. As a result, the surface tracking property of the sheet is excellent. In detail, when the sheet is stretched, it can be stretched appropriately. The constant load elongation is affected by the number of tissue points and the number of tissue point fibers. The fewer the tissue points, the easier it is to stretch, and the more the number of tissue point fibers, the harder it is to stretch.

[0112] The sheet-like material preferably has a constant load elongation of 6 to 40% in both the warp and weft directions. Specifically, when the fibrous substrate is a woven fabric, the constant load elongation is preferably 5 to 20%, more preferably 5.5 to 15%. When the fibrous substrate is a woven fabric, the constant load elongation is preferably 10 to 40%, more preferably 15 to 35%.

[0113] In this specification, the constant load elongation refers to the elongation when a test piece with a width of 80 mm is clamped at both ends with a clamping interval of 150 mm in the longitudinal direction and a load of 98.1 N is applied for 10 minutes. The detailed measurement method is described in the Examples.

[0114] Regarding the imitation suede leather sheet involved in the present embodiment, the constant load setting rate of the sheet in the warp and weft directions is less than 10%. That is, the constant load setting rate of the sheet in the warp direction is less than 10%, and the constant load setting rate in the weft direction is less than 10%. As a result, the surface tracking property of the sheet is excellent. In detail, when the sheet is stretched for installation, it is possible to prevent the sheet from remaining stretched without recovering. Therefore, it is possible to follow surfaces of various shapes. The constant load setting rate is affected by the number of tissue points and the number of tissue point fibers. The more tissue points there are, the lower the constant load setting rate. In addition, the more tissue point fibers there are, the less likely the line is to move at the tissue point, and therefore, the lower the constant load setting rate.

[0115] The constant load setting rate of the sheet is preferably 0 to 8.5% in both the warp and weft directions, and can be 0.5 to 8.5%. Specifically, when the fibrous substrate is a woven fabric, the constant load setting rate is preferably 6% or less, and can be 0.5 to 6%. When the fibrous substrate is a woven fabric, the constant load setting rate is preferably 8.5% or less, and can be 0.5 to 8.5%.

[0116] In this specification, the constant load setting rate refers to: using a test piece with a width of 80 mm, clamping the two ends of the test piece with a clamping interval of 150 mm in the length direction, applying a load of 98.1N for 10 minutes, and then removing the load and leaving it for 10 minutes. The detailed measurement method is described in the examples.

[0117] In one embodiment, the imitation napped leather sheet may be provided with a backing on its back. In a preferred embodiment, the back of the sheet is not formed with napped hairs, and the backing as a resin layer may be provided on the back of the sheet.

[0118] The backing is provided, for example, to impart flame retardancy and prevent cracking when the fibrous substrate is a woven fabric, and is provided, for example, to impart flame retardancy when the fibrous substrate is a woven fabric. The backing can be formed by applying a backing agent containing a flame retardant and a binder resin to the back of the fibrous substrate. The backing agent may contain various additives such as a solvent and a tackifier in addition to the flame retardant and the binder resin.

[0119] The flame retardant is not particularly limited, and for example, a phosphorus-based flame retardant can be used. Examples of the phosphorus-based flame retardant include ammonium polyphosphate, aluminum phosphate, phosphate ester, guanidine phosphate, and organic phosphine oxide. Any one of these flame retardants can be used alone, or two or more can be used in combination.

[0120] As the binder resin, a resin that acts as a binder for attaching the flame retardant to the fibrous substrate can be used, for example, polyurethane resin, acrylic resin, silicone resin, vinyl chloride resin, etc. Polyurethane resin is preferably used. The mass ratio of the flame retardant to the binder resin (converted by solid amount) is not particularly limited, for example, the flame retardant: binder resin can be 5:5 to 9:1, or 6:4 to 8:2.

[0121] The amount of the backing agent applied to the sheet is not particularly limited, but may be 10 to 100 g / m2 in terms of solid amount (i.e., amount of the backing agent). 2 , can also be 40~80g / m 2 .

[0122] The manufacturing method of the imitation fuzz leather sheet involved in this embodiment is not particularly limited. The manufacturing method involved in one embodiment includes, in order: (1) a step of forming fuzz on at least one side of a fibrous substrate as a textile or a woven fabric using fibers constituting the textile or the woven fabric, and (2) a step of applying resin to the fibrous substrate with fuzz formed thereon. In addition, it may include: (3) a step of subjecting the fibrous substrate to which the resin has been applied to at least one bath treatment selected from the group consisting of dyeing, refining and soaping. In addition, it may include: (4) a step of applying a backing to the back of the fibrous substrate. In this way, the step of applying resin to the fibrous substrate in (2) is performed before the step of treating in the bath in (3), so that the wear resistance can be improved.

[0123] In the process of forming the standing naps in the above (1), the method for forming the standing naps is not particularly limited, and known methods can be cited. For example, there can be cited: a method of opening the woven structure of double-sided textiles, sinker needle circular knitted fabrics, double-sided knitted fabrics, etc., and a method using a raising machine such as a needle cloth raising machine and a corundum raising machine. Among them, from the perspective of appearance and touch, the method using a raising machine is preferred. The methods using a raising machine include full-cut raising, half-cut raising, and coil raising, and the method using half-cut raising is more preferred. Here, full-cut raising refers to raising in which all the fibers constituting the coil-shaped raising yarn are cut. Half-cut raising refers to raising in which a part of the fibers constituting the coil-shaped raising yarn is cut. Coil raising refers to raising in which the coil-shaped raising yarn is not cut.

[0124] In the step (2) of applying the resin, a resin composition liquid is applied to the fibrous base material. The resin composition liquid may contain a solvent such as a highly polar solvent as required. As the solvent, water is preferably used from the viewpoint of environmental load.

[0125] As a method for applying the resin composition liquid to the fibrous substrate, various methods known in the past can be used, without particular limitation. For example, methods such as dipping, coating, spraying, and printing and dyeing can be cited. Among them, in terms of being able to uniformly apply the resin to the fibrous substrate, it is preferably applied by dipping.

[0126] When immersion is used as a method for applying the resin composition liquid to the fibrous base material, the lifting rate is not particularly limited, but is preferably 20 to 80% by mass. When the lifting rate is within this range, a desired amount can be applied evenly.

[0127] After the resin composition liquid is applied to the fibrous substrate, heat treatment is performed as needed. The purpose of heat treatment is to evaporate the solvent in the resin composition liquid, thereby drying the resin. In addition, when a catalyst or cross-linking agent that undergoes a cross-linking reaction due to heat treatment is used, or when a two-liquid curing resin is used, the purpose of heat treatment is to promote the reaction and form a film with sufficient strength. The heat treatment temperature can be, for example, 130 to 190°C, or 150 to 170°C. The heat treatment time can be 1 to 3 minutes, or 2 to 3 minutes.

[0128] The bath treatment step (3) is not particularly limited, and any desired step may be used. Examples thereof include a dyeing step, a scouring step, and a soaping step. These steps are conventionally known steps, and conventionally known methods may be used.

[0129] The backing treatment step (4) is not particularly limited, and a backing agent is applied to the back side (i.e., the side opposite to the napped side) of the fibrous substrate after the resin is applied or the fibrous substrate further subjected to dyeing, etc. A backing layer is formed on the back side of the fibrous substrate by heat treatment after the coating.

[0130] In the case of the imitation suede leather sheet of the present embodiment, a woven fabric is used as the fibrous base material, and its density (the number of tissue points and the number of fibers in the tissue points) is specified. This allows the surface appearance and feel to be comparable to those of artificial leather using a nonwoven fabric as the fibrous base material, and also allows the sheet to have excellent hair removal resistance, fatigue durability, fatigue strength, and surface followability.

[0131] The use of the imitation suede leather sheet material involved in this embodiment is not particularly limited. As specific examples of uses, various vehicle interior materials represented by automobile interior materials such as automobile seats, ceiling materials, instrument panels, door linings or steering wheels can be cited. In addition, home furnishing uses such as the surface leather for sofas and chairs, and fashion uses such as bags and shoes can be cited.

[0132] It should be noted that, regarding the various numerical ranges described in the specification, their upper limits and lower limits can be arbitrarily combined, and all of their combinations are described in this specification as preferred numerical ranges. In addition, the description of the numerical range of "X to Y" means greater than X and less than Y.

[0133] Example

[0134] Hereinafter, the present invention will be described in further detail using examples; however, the present invention is not limited to the following examples.

[0135] Each evaluation item was carried out according to the following method.

[0136] [Elongation under constant load]

[0137] Take 3 test pieces of 80mm width and 250mm length from the warp and weft directions of the sheet. Mark lines with intervals of 100mm in the center of the length direction of the test piece. Install the test piece in a clamping interval of 150mm without loosening in an atmosphere of room temperature 23±2℃ and humidity 50±5%RH in a constant load elongation test device (Martens type) (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.). Apply a load of 98.1N including the weight of the clamp to the lower clamp. Measure the distance L (mm) between the markings after 10 minutes of placement, and calculate the constant load elongation (%) using the following formula.

[0138] Elongation under constant load (%) = {(L-100) / 100}×100

[0139] The elongation under constant load was calculated as an average value of the measured values ​​of three test pieces in each of the warp direction and the weft direction. If the elongation under constant load in both the warp direction and the weft direction was 5% or more, the surface followability was excellent.

[0140] [Constant load setting rate]

[0141] Take 3 test pieces of 80mm width and 250mm length from the warp and weft directions of the sheet. Mark lines with intervals of 100mm in the center of the length direction of the test piece. Install the test piece in a clamping interval of 150mm without loosening in an atmosphere of room temperature 23±2℃ and humidity 50±5%RH in a constant load elongation test device (Martens type) (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.). Apply a load of 98.1N including the weight of the clamp to the lower clamp. After standing for 10 minutes, remove the test piece from the testing machine and place it on a horizontal platform for 10 minutes. After standing for 10 minutes, measure the distance L1 (mm) between the markings. The constant load setting rate is calculated using the following formula.

[0142] Constant load setting rate (%) = {(L1-100) / 100}×100

[0143] The constant load setting rate is calculated as the average value of the measured values ​​of three test pieces in the warp direction and the weft direction. If the constant load setting rate in the warp direction and the weft direction is less than 10%, the surface followability is excellent.

[0144] [Fatigue durability (joint fatigue)]

[0145] From the warp and weft directions of the sheet, take two sets of test pieces with a width of 100 mm and a length of 100 mm in a set of two. Overlap the surfaces of the two test pieces and sew them together at a position 6 mm from the end of one side. The suturing conditions are as follows: knitting needle: No. 21-S (produced by Organ-needles Co., Ltd.), suture: polyester #8, seam form: flat seam, seam spacing: 25±2 mesh / 100mm. Set a total of four straight line cuts with a length of 92 mm perpendicular to the sewn edges at a position 25 mm from each end of the two sides opposite to the sewn edges to make test pieces (refer to Figure 7 ).

[0146] A TTD type joint fatigue testing machine (TTD-100, manufactured by Daiei Kagaku Seiki Mfg. Co., Ltd.) is used to set a clamping part in the central part divided into three parts by the above-mentioned incision. The test piece is set in a horizontal posture and fixed to the left and right chucks at intervals of 120 mm in such a way that the joint comes to the center. The left and right sides are repeatedly stretched 2500 times with a load of 29.4N, a stroke of 150mm, and a speed of 30 times / minute. After stretching 2500 times, the maximum value of the slippage state of the joint (the size of the hole) is measured in a static state with the load applied. Fatigue durability is expressed as any larger value in the two groups of test pieces in the warp and weft directions. If the result is less than 2.2mm, it can be said that the fatigue durability is excellent.

[0147] [Fatigue strength (joint strength)]

[0148] From the warp and weft directions of the sheet, take three groups of test pieces with a width of 100 mm and a length of 100 mm in a group of two. Overlap the surfaces of the two test pieces and sew them together at a position 6 mm from the end of one side. The suturing conditions are as follows: knitting needle: No. 21-S (manufactured by Organ-needles Co., Ltd.), suture: polyester #8, seam form: flat seam, seam spacing: 25±2 mesh / 100 mm. Using a tensile testing machine (Autograph AG-1, manufactured by Shimadzu Corporation), the test pieces are clamped with a clamp (regarding the size, both the top and the bottom are as follows: front side: 25.4 mm vertically, 25.4 mm horizontally, back side: 25.4 mm vertically, 50.8 mm horizontally) at an interval of 76 mm (refer to Figure 8 ). The load (N) required for breaking when stretched at a speed of 200 mm / min from this state is measured. Regarding fatigue strength, the minimum value of the three test pieces in the warp and weft directions is expressed. If the result is 300N or more, it can be said that the fatigue strength is excellent.

[0149] [Abrasion resistance and hair removal]

[0150] After taking a test piece with a width of 70 mm and a length of 300 mm from the weft direction of the sheet, a polyurethane foam sheet with a width of 70 mm, a length of 300 mm and a thickness of 10 mm is added to the back, and fixed on a plane wear tester T-TYPE (manufactured by Daiei Kagaku Seiki Mfg. Co., Ltd.). A load of 9.8 N is applied to the friction piece covered with cotton cloth (cotton canvas), and the surface (hair side) of the test piece is rubbed. The friction piece is rubbed back and forth 10,000 times at a speed of 60 times / minute within 140 mm on the surface of the test piece. Observe the surface of the test piece before and after friction, and evaluate the wear resistance according to the following criteria. In addition, in the table, the case with hair removal is recorded as "yes", and the case without hair removal is recorded as "no".

[0151] <Evaluation Criteria>

[0152] Grade 5: There is no change in the state of the worn part.

[0153] Grade 4: Surface fibers are slightly entangled along the worn surface but are barely noticeable.

[0154] Grade 3: Surface fibers are entangled along the worn surface but are not noticeable.

[0155] Grade 2: Surface fibers are entangled along the worn surface and are very noticeable. Hair loss occurs slightly.

[0156] Level 1: The entangled fibers or threads fall off (hair loss occurs), and the bottom thread can be seen.

[0157] [Feel (rigidity)]

[0158] The measurement was performed in accordance with JIS L 1096:2010A method (45° cantilever method) with the surface of the test piece facing upward. If the result was 130 mm or less in both the warp and weft directions, the hand feel was considered to be excellent.

[0159] [Feel (sensory evaluation)]

[0160] The imitation napped leather sheet was held by hand and evaluated according to the following evaluation criteria.

[0161] <Evaluation Criteria>

[0162] Level 5: The hardness of the fibrous base material is not felt (hardness of the core).

[0163] Level 4: Hardness of the fibrous base material (hardness with a core) is hardly felt.

[0164] Level 3: Although the hardness of the fiber base material (hardness of the core) is felt, no discomfort is felt.

[0165] Level 2: The hardness of the fibrous base material (hardness with a core) is felt.

[0166] Level 1: The hardness of the fibrous base material (hardness of the core) is strongly felt.

[0167] [Surface appearance]

[0168] The surface of the simulated suede leather sheet was stroked five times by hand in the direction of the grain, and then the surface was visually observed and evaluated according to the following evaluation criteria.

[0169] <Evaluation Criteria>

[0170] Level 5: No tissue texture can be seen.

[0171] Grade 4: Tissue texture is slightly visible but barely noticeable.

[0172] Grade 3: Tissue texture can be seen but is not noticeable.

[0173] Level 2: Tissue texture is visible and slightly noticeable.

[0174] Level 1: The tissue texture can be seen and is very conspicuous.

[0175] [Filling rate calculation method]

[0176] For the cross-sections perpendicular to the warp direction and the cross-sections parallel to the warp direction of the woven structure, a scanning electron microscope (S-3000N, manufactured by Hitachi High-Technologies Corporation) was used to photograph the nap part and the base structure part at a magnification of 1000 times. The photographed image was enlarged and printed in A4 size. In the printed image, the cross-section of the resin was painted red. Then, the red-painted part was cut off, and the mass of the paper (Ma) of the entire observation area and the mass of the paper of the cut resin part (Mb) were measured, and the filling rate of the resin per unit area was calculated as (Mb / Ma)×100(%). Regarding the filling rate, any 5 points were measured for the above-mentioned orthogonal cross-sections and parallel cross-sections, and the average value of the remaining 3 points excluding the maximum and minimum values, a total of 6 points, was calculated to find the filling rate.

[0177] [Example 1]

[0178] As for the warp, a mixed yarn of 83dtex / 24f polyester processed yarn (16-split fiber yarn) and 33dtex / 12f polyester high shrinkage yarn was used as the surface yarn, and 83dtex / 36f polyester processed yarn was used as the back yarn. As for the weft, 167dtex / 48f polyester processed yarn was used. Figure 2 The textile structure shown in the organization diagram is used to produce 7-piece satin fabric.

[0179] The obtained textile was washed and dried. Then, a raising treatment was performed to raise the fluff on the textile surface using a card cloth raising machine having 12 raising rollers and 12 reverse raising rollers. The raising treatment was performed three times alternately in the direction from the start of spinning and the direction from the end of spinning at a card cloth roller torque of 10 MPa and a fabric speed of 15 m / min.

[0180] Next, after heat treatment at 150°C for 3 minutes using a heat setting machine, half-cut raising was performed using a corundum raising machine with sandpaper (#320). Specifically, the surface (raising surface) of the textile was ground at a surface speed of 1000 rpm, a clearance of 0.8 mm, and a cloth speed of 8 m / min to obtain a standing textile (weight 250 g / m 2 , thickness 1050μm, single fiber fineness of the standing nap portion 0.22dtex, standing nap length 300μm, warp density of the fibrous base material 366 strands / 25.4mm, weft density 60 strands / 25.4mm).

[0181] The obtained napped textile fabric was immersed in the resin composition liquid of the formula 1 shown in Table 1 at a lifting rate of 50% by mass using a cloth mangle. Next, a heat treatment was performed at 170°C for 3 minutes using a heat setting machine. Thus, a sheet-like product was obtained in which the napped textile fabric as a fibrous substrate was impregnated with a silicone resin and a polyurethane resin. The obtained sheet-like product was dyed with a disperse dye at 130°C for 50 minutes using a liquid flow dyeing machine, and then a heat treatment was performed at 130°C for 3 minutes using a heat setting machine.

[0182] On the back of the obtained textile fabric, a knife coater was used to coat the back of the textile fabric at a dry coating weight of 60 g / m 2 The following backing agent was applied. Next, heat treatment was performed at 130°C for 3 minutes using a heat setting machine to obtain the imitation suede leather sheet of Example 1. Regarding the obtained imitation suede leather sheet, the warp density of the fibrous substrate was 366 / 25.4mm, the weft density was 60 / 25.4mm, the number of tissue points per 25.4mm square was 3137, the total number of fibers involved in the cross at each 25.4mm square tissue point was 828,206, the constant load elongation was more than 5% in both the warp and weft directions, and the constant load setting rate was less than 10% in both the warp and weft directions.

[0183] [Backing agent]

[0184] The flame retardant and the binder resin were mixed in a mass ratio of 7:3 in terms of solid content, and water was added to obtain a mixed solution with a solid content of 50% by mass. As a flame retardant, ammonium polyphosphate (NH4PO3) was used. n(Manufactured by Amada Co., Ltd., powder). As a binder resin, a polyurethane resin (manufactured by DIC Corporation, HYDRAN WLS-201, solid content 33-37% by mass) was used. A thickener (manufactured by Adeka Co., Ltd., Adekanol UH-540, solid content 30% by mass) was used to adjust the obtained mixed liquid to a viscosity of 15000 mPa·s to prepare a backing agent.

[0185] [Example 3]

[0186] A fibrous substrate having raised nap was prepared in the same manner as in Example 1, except that three strands of 83 dtex / 36f polyester yarns were twisted together as the back yarn and weft yarn of the warp, and the basis weight, thickness, and density were changed as shown in Table 2. A simulated raised nap leather sheet of Example 3 was obtained in the same manner as in Example 1, except that the resin composition liquid applied to the fibrous substrate was Formula 2 shown in Table 1.

[0187] [Examples 4 and 5]

[0188] Except changing the basis weight or density of the fibrous base material as shown in Tables 2 and 3, the simulated suede leather sheets of Examples 4 and 5 were prepared in the same manner as in Example 1.

[0189] [Examples 2, 6 to 9]

[0190] As the resin composition liquid applied to the fibrous substrate, the same procedure as in Example 1 was carried out except that the formulations 2, 3, 6 to 8 shown in Table 1 were used as shown in Tables 2 to 4, respectively, to obtain the simulated suede leather sheets of Examples 2 and 6 to 9.

[0191] [Examples 10 to 12]

[0192] In Example 10, the textile structure of the fibrous substrate was changed to Fig. 9 In Example 11, the textile structure of the fibrous substrate is changed to Fig.10 In Example 12, the textile structure of the fibrous substrate is changed to Fig.11 Except for the eight satin weaves shown, the same procedure as in Example 1 was carried out to obtain the simulated napped leather sheets of Examples 10 to 12.

[0193] [Comparative Example 1]

[0194] A nonwoven fabric (manufactured by Asahi Kasei Corporation, 3007B, basis weight 280 g / m2) to which 8.9% by mass of a polycarbonate-based polyurethane resin was attached to the fibers was used. 2 ) instead of textile. The nonwoven fabric was subjected to the same raising treatment as in Example 1 to obtain a raised nonwoven fabric. The total weight of the fibrous substrate and the polyurethane resin was 280 g / m2 The weight of the fiber substrate is 257g / m 2 , thickness 900μm, single fiber fineness of the napped part is 0.15dtex and 0.3dtex, and the length of the napped part is 130μm. As the resin composition liquid for treating the napped nonwoven fabric, the prescription 3 shown in Table 1 was used. Except for this, the resin composition liquid was applied by the same operation as in Example 1, and dyeing and heat treatment were performed. Thereafter, the dry coating amount was 70g / m 2 The backing treatment was carried out in the same manner as in Example 1 except that the backing agent was applied, thereby obtaining a simulated suede leather sheet of Comparative Example 1.

[0195] [Comparative Examples 2 and 3]

[0196] Except having changed the basis weight and density of the fiber base material as shown in Table 5, the similar napped leather sheet-like materials of Comparative Examples 2 and 3 were produced in the same manner as in Example 1.

[0197] The details and evaluation of the obtained imitation suede leather sheet are shown in Tables 2 to 5. Regarding the "resin" in Tables 2 to 5, the "resin adhesion amount" is the amount of resin applied to the fibrous substrate using the resin composition liquid shown in Table 1 (converted as a solid amount) (the same in the following Tables 6 to 8). When two or more resins are used in combination in the resin composition liquid shown in Table 1, for example, in the case of Example 1, the total adhesion amount of the silicone resin and the polyurethane resin (converted as a solid amount) is used. When a single resin is used in the resin composition liquid, for example, in the case of Examples 6, 7, and 9, the adhesion amount of the resin is (converted as a solid amount).

[0198] In the "imitation suede leather sheets" in Tables 2 to 5, "thickness (μm)", "length of the suede (μm)", "single fiber fineness of the suede part", "density of the fibrous substrate", "number of tissue points", "number of tissue point fibers", "constant load elongation (%)" and "constant load setting rate (%)" are the values ​​in the imitation suede leather sheets (the same as in Tables 6 to 8 below).

[0199] In Example 1, the number of tissue points is calculated using the above formula (1) as follows. Figure 2 The organization diagram of and the density of the fibrous substrate in Table 2, in formula (1), n ​​= 2, A1 = 183 strands / 25.4 mm, A2 = 183 strands / 25.4 mm, B1 = 2 strands / strand, B2 = 2 strands / strand, C = 60 strands / 25.4 mm, D = 14 strands. Therefore, the number of organization points is solved using the following formula.

[0200] [Mathematical formula 7]

[0201] Organization points (pcs / 25.4 mm square) = (183×2×60÷14) + (183×2×60÷14) = 3137

[0202] The same solution was obtained using the formula (1) for Examples 3 to 5 and Comparative Examples 2 and 3, which had different structures of the fibrous substrate.

[0203] In Example 10, the repeating unit of the weft is D = 10, B1 = 2 / root, and B2 = 2 / root. In Example 11, the repeating unit of the weft is D = 6, B1 = 1 / root, and B2 = 1 / root. In Example 12, the repeating unit of the weft is D = 16, B1 = 2 / root, and B2 = 2 / root. n, A1, A2, and C in formula (1) are the same as those in Example 1. Using these values, the number of tissue points of Examples 10 to 12 is calculated according to formula (1).

[0204] In Example 1, the number of fibers at the organization point was calculated as follows using (3) above. Based on the use of the fiber base yarn in Table 2, E1=24×16+12 (threads), E2=36 (threads), and F=48 (threads). Therefore, the number of fibers at the organization point was calculated using the following formula.

[0205] [Mathematical formula 8]

[0206] Number of fibers at tissue point (roots / 25.4 mm square)

[0207] =(183×2×60÷14)×(24×16+12+48)+(183×2×60÷14)×(36+48)

[0208] =828206

[0209] The same solution was obtained using the formula (3) for Examples 3 to 5, 10 to 12 and Comparative Examples 2 and 3, which had different structures of the fibrous substrate.

[0210] [Table 1]

[0211] Mixing (mass parts)

[0212] Element Solid content Prescription 1 Prescription 2 Prescription 3 Prescription 4 Prescription 5 Prescription 6 Prescription 7 Prescription 8 Silicone resin 1 50％ 4 3 4 2 8 Silicone resin 2 36％ 5.5 Silicone oil 1 42％ 5 Polyurethane resin 1 36％ 36 27 18 72 36 36 36 Catalyst solution 1 18％ 4 3 4 2 8 water 56 67 92 78 12 64 58.5 64 total 100 100 100 100 100 100 100 100

[0213] The details of each component in Table 1 are as follows.

[0214] Silicone resin 1: A resin solution (solid content 50% by mass) prepared by mixing 50 parts by mass of methyl hydrogen silicone oil (“KF99” manufactured by Shin-Etsu Chemical Co., Ltd., solid content 100% by mass, used in combination with a catalyst and subjected to heat treatment to form a three-dimensional network structure), 2 parts by mass of polyoxyethylene polyoxypropylene glycol (manufactured by Fuji Film & Wako Pure Chemical Industries, Ltd., dispersant, solid content 100% by mass), and 48 parts by mass of water.

[0215] Silicone resin 2: "NICA SILICONE AMZ-3" manufactured by Nikka Chemical Co., Ltd., amino-modified silicone resin, solid content: 36% by mass.

[0216] Silicone oil 1: dimethyl silicone oil, "Eras finish S-65" manufactured by Daiichi Kogyo Seiyaku Co., Ltd., active ingredient 42% by mass.

[0217] Polyurethane resin 1: "Evaphanol APC-66" manufactured by Nikka Chemical Co., Ltd., a polycarbonate-based polyurethane resin (aqueous one-component type, forced emulsification type, solid content 36% by mass).

[0218] Catalyst solution 1: A cross-linking catalyst solution (solid content 18% by mass) prepared by mixing 14 parts by mass of zinc stearate (manufactured by Fuji Film & Wako Pure Chemical Industries, Ltd., catalyst, solid content 100% by mass), 4 parts by mass of polyoxyethylene polyoxypropylene glycol (manufactured by Fuji Film & Wako Pure Chemical Industries, Ltd., dispersant, solid content 100% by mass), and 82 parts by mass of water.

[0219] [Table 2]

[0220]

[0221] [Table 3]

[0222]

[0223] [Table 4]

[0224]

[0225] [Table 5]

[0226]

[0227] The results are shown in Tables 2 to 5. In the comparative example 1 using a nonwoven fabric as the fibrous substrate, hair loss occurred. In addition, the fabric fibers were exposed, and the surface appearance was also deteriorated. In addition, the elongation under constant load was low, and the surface followability was also deteriorated.

[0228] In the imitation suede leather sheet of Comparative Example 2, a textile was used as a fibrous base material, but the number of tissue points per 25.4 mm square was less than 1,500, and the number of tissue point fibers was less than 396,000, so fatigue durability, fatigue strength and surface appearance were poor. In Comparative Example 2, the constant load setting rate in the weft direction was more than 10%, and the surface tracking property was poor. In the imitation suede leather sheet of Comparative Example 3, the number of tissue points per 25.4 mm square was more than 10,000, and the number of tissue point fibers was more than 2,640,000, so the hand feeling was poor.

[0229] In contrast, the imitation suede leather sheets of Examples 1 to 12 have a surface appearance and feel comparable to those of artificial leather using nonwoven fabric as a fibrous substrate, and do not shed hair due to wear, and have excellent fatigue durability and fatigue strength. In addition, in Examples 1 to 12, the constant load elongation is 5% or more, and the constant load setting rate is less than 10%. Therefore, when the sheet is attached to the seat, the sheet can be appropriately stretched and attached using tension. In addition, after attachment, the tension is released, and the excessive elongation can be restored, thereby suppressing the generation of wrinkles in the sheet. Therefore, the sheet of Examples 1 to 12 has excellent surface followability.

[0230] [Example 13]

[0231] A 24G circular knitting machine was used, and 83dtex / 24f polyester processed yarn (16-split split yarn) was introduced as the surface yarn, 83dtex / 12f polyester processed yarn was introduced as the connecting yarn, and 167dtex / 48f polyester processed yarn was introduced as the back yarn. Figure 4 The terry weave shown is knitted to create a circular knit.

[0232] The obtained circular knitted fabric was washed and dried. Then, a raising treatment was performed to raise the nap on the surface of the circular knitted fabric using a card cloth raising machine having 12 raising rollers and 12 reverse raising rollers. The raising treatment was performed three times alternately in the knitting start direction and the knitting end direction at a card cloth roller torque of 10 MPa and a fabric speed of 15 m / min.

[0233] Next, after heat treatment at 150°C for 3 minutes using a heat setting machine, half-cut raising is performed using a corundum raising machine with sandpaper (#320). Specifically, the surface (raised surface) of the circular knitted fabric is ground at a surface speed of 1000 rpm, a clearance of 0.8 mm, and a fabric speed of 8 m / min. Next, heat treatment is performed at 150°C for 3 minutes using a heat setting machine according to the desired density, and tentering is performed. Thus, a circular knitted fabric with upright nap (gram weight 400 g / m 2, thickness 1100 μm, single fiber fineness of the standing nap portion 0.22 dtex, standing nap length 300 μm, density of the fibrous base material 73 coil rows / 25.4 mm, 33 coil longitudinal rows / 25.4 mm).

[0234] The obtained napped circular knitted fabric was immersed in the resin composition liquid of the formula 1 shown in Table 1 at a lifting rate of 50% by mass using a cloth mangle. Next, a heat treatment was performed at 170°C for 3 minutes using a heat setting machine. Thus, a sheet-like product was obtained in which the napped circular knitted fabric as a fibrous substrate was impregnated with a silicone resin and a polyurethane resin. The obtained sheet-like product was dyed with a disperse dye at 130°C for 50 minutes using a liquid jet dyeing machine, and then a heat treatment was performed at 130°C for 3 minutes using a heat setting machine.

[0235] On the back of the obtained circular knitted fabric, a knife coater was used to coat the fabric at a dry coating weight of 65 g / m 2 The above-mentioned backing agent was applied. Next, heat treatment was performed at 130° C. for 3 minutes using a heat setting machine to obtain the imitation suede leather sheet of Example 13. Regarding the obtained imitation suede leather sheet, the number of tissue points per 25.4 mm square was 4818, the total number of fibers involved in entanglement at each 25.4 mm square tissue point was 2,197,008, the constant load elongation was more than 5% in both the warp and weft directions, and the constant load setting rate was less than 10% in both the warp and weft directions.

[0236] [Examples 14 and 15]

[0237] As the resin composition liquid applied to the fibrous substrate, the same procedure as in Example 13 was carried out except that the formulations 4 and 5 shown in Table 1 were used as shown in Table 6, respectively, to obtain the simulated napped leather sheets of Examples 14 and 15.

[0238] [Example 16]

[0239] The weave of the fiber base material is changed to Figure 6 A simulated napped leather sheet of Example 16 was obtained in the same manner as in Example 1 except for the above-mentioned Mockroddy structure.

[0240] [Example 17]

[0241] After half-cutting and raising, heat treatment was performed at 150°C for 3 minutes in a heat setting machine, and the tentering conditions were changed to obtain a napped circular knitted fabric (weight 280 g / m 2, thickness 900 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 200 μm, density of the fibrous substrate 50 rows / 25.4 mm, 30 wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 54% by mass. In addition, the imitation napped leather sheet of Example 17 was obtained in the same manner as in Example 13.

[0242] [Example 18]

[0243] After half-cutting and raising, heat treatment was performed in a heat setting machine, and shrinkage was performed at 150°C for 3 minutes according to the desired density, instead of stretching, thereby obtaining a round knitted fabric with raised nap (weight 480 g / m 2 , thickness 1200 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 400 μm, density of the fibrous substrate 90 coil rows / 25.4 mm, 45 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 49% by mass. In addition, the imitation napped leather sheet of Example 18 was obtained in the same manner as in Example 13.

[0244] [Example 19]

[0245] As the surface yarn, 83dtex / 24f polyester processed yarn (8-split fiber yarn) was used. After half-cutting and raising, heat treatment was performed at 150°C for 3 minutes in a heat setting machine, and the stretching conditions were changed to obtain a round knitted fabric with upright nap (weight 300g / m 2 , thickness 1000 μm, single fiber fineness of the napped portion 0.44 dtex, length of the napped portion 200 μm, density of the fibrous substrate 55 coil rows / 25.4 mm, 33 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 57% by mass. In addition, the imitation napped leather sheet of Example 19 was obtained in the same manner as in Example 13.

[0246] [Example 20]

[0247] As the surface yarn, a double-stranded yarn obtained by twisting two 83dtex / 24f polyester processed yarns (16-split split yarns) was used. In addition, the lifting rate when the napped circular knitted fabric was impregnated was set to 51% by mass. Except for this, the imitation napped leather sheet of Example 20 was obtained in the same manner as Example 13.

[0248] [Example 21]

[0249] As the surface yarn, three 83dtex / 24f polyester processed yarns (16-split split yarns) were twisted together to form a three-ply yarn. After half-cutting and raising, heat treatment was performed in a heat setting machine at 150°C for 3 minutes to achieve a desired density and shrink the width instead of stretching the width, thereby obtaining a napped circular knitted fabric (weight 460 g / m 2 , thickness 1400 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 400 μm, density of the fibrous substrate 73 coil rows / 25.4 mm, 45 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 49% by mass. In addition, the imitation napped leather sheet of Example 21 was obtained in the same manner as Example 13.

[0250] [Comparative Example 4]

[0251] A 24G circular knitting machine was used, and 77dtex / 216f polyester processed yarn was introduced as the top and connecting yarns, and 121dtex / 36f polyester processed yarn was introduced as the back yarn. Fig.12 The same procedure as in Example 13 was followed to obtain the imitation nap leather sheet of Comparative Example 4 except that the knitted fabric was knitted from the knitted fabric of the tuck structure shown in FIG. Fig.13 .

[0252] [Comparative Example 5]

[0253] After half-cutting and raising, heat treatment was performed at 150°C for 3 minutes in a heat setting machine, and the tentering conditions were changed to obtain a napped circular knitted fabric (weight 270 g / m 2 , thickness 900 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 200 μm, density of the fibrous substrate 40 coil rows / 25.4 mm, 28 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 53% by mass. In addition, the imitation napped leather sheet of Comparative Example 5 was obtained in the same manner as in Example 13.

[0254] [Comparative Example 6]

[0255] After half-cutting and raising, heat treatment was performed in a heat setting machine, and the width was reduced by heat treatment at 150°C for 3 minutes according to the desired density, instead of stretching, thereby obtaining a circular knitted fabric with standing nap (weight 490g / m 2, thickness 1200 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 410 μm, density of the fibrous substrate 95 coil rows / 25.4 mm, 50 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 49% by mass. In addition, the imitation napped leather sheet of Comparative Example 6 was obtained in the same manner as in Example 13.

[0256] [Comparative Example 7]

[0257] As the surface yarn, 83dtex / 24f polyester processed yarn (8-split fiber yarn) was used. After half-cutting and raising, heat treatment was performed at 150°C for 3 minutes in a heat setting machine, and the stretching conditions were changed to obtain a round knitted fabric with upright nap (weight 290g / m 2 , thickness 1000 μm, single fiber fineness of the napped portion 0.44 dtex, length of the napped portion 200 μm, density of the fibrous substrate 50 coil rows / 25.4 mm, 33 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 56% by mass. In addition, the imitation napped leather sheet of Comparative Example 7 was obtained in the same manner as in Example 13.

[0258] [Comparative Example 8]

[0259] As the surface yarn, a three-ply yarn obtained by twisting three 83dtex / 24f polyester processed yarns (16-split split yarns) was used. After half-cutting and raising, heat treatment was performed in a heat setting machine at 150°C for 3 minutes to perform shrinkage at the desired density instead of stretching, thereby obtaining a round knitted fabric with standing nap (weight 470g / m 2 , thickness 1400 μm, single fiber fineness of the napped portion 0.22 dtex, length of the napped portion 400 μm, density of the fibrous substrate 73 coil rows / 25.4 mm, 50 coil wales / 25.4 mm). The lifting rate during the immersion treatment of the obtained napped circular knitted fabric was set to 49% by mass. In addition, the imitation napped leather sheet of Comparative Example 8 was obtained in the same manner as in Example 13.

[0260] Tables 6 to 8 show the details and evaluation of the obtained simulated napped leather sheet.

[0261] In Examples 13 to 15, the number of tissue points was calculated as follows using the above formula (2-1). Figure 4 The organization diagram of and the density of the fibrous substrate in Table 6, in formula (2-1), G F =G R =73 coil rows / 25.4mm, I F =I R= 33 wales / 25.4 mm. Therefore, the number of organization points is calculated using the following formula.

[0262] [Mathematical formula 9]

[0263] Organization points (pieces / 25.4 mm square) = 73 × 33 + 73 × 33 = 4818

[0264] In Examples 13 to 15, the number of fibers at the organization point was calculated as follows using the above formula (4-1). According to the use of the fiber base yarn in Table 6, K = 24 × 16 (threads), L = 12 (threads), and M = 48 (threads). Therefore, the number of fibers at the organization point was calculated using the following formula.

[0265] [Formula 10]

[0266] Number of fibers at tissue points (roots / 25.4 mm square) = 73 × 33 × (24 × 16 + 12) × 2 + 73 × 33 × (48 + 12) × 2

[0267] =2197008

[0268] Regarding Examples 17 to 21 and Comparative Examples 5 to 8, the number of tissue points was also calculated using Formula (2-1), and the number of tissue point fibers was calculated using Formula (4-1).

[0269] In Example 16, the number of tissue points was calculated using the above formula (2-1) in the same manner as in Example 13, and the result was 4818 / 25.4 mm square. The number of tissue point fibers was calculated using the above formula (4-2) as follows.

[0270] [Mathematical formula 11]

[0271] Number of fibers at tissue points (roots / 25.4 mm square) = 73 × 33 × (24 × 16 + 12) + 73 × 33 × (48 + 12) = 1098504

[0272] In Comparative Example 4, the number of tissue points is calculated as follows. In a tuck structure (double-sided knitted fabric), there are tucks on the front surface, but no tucks on the back surface. Therefore, the tissue points are calculated on the front surface and back surface respectively, and the sum of the two is calculated. On the back surface where there is no tuck, the same consideration can be given as for the terry structure. On the other hand, regarding the surface, according to Fig.12 and Fig.13 , there is one tuck for every 4 rows of stitches in the warp direction, and one tuck for every 2 wales in the weft direction. Therefore, the number of tissue points on the surface is the number of tissue points calculated in the same way as the terry tissue minus the number of tucks. Therefore, the number of tissue points is calculated using the following formula (where G R ,I R Same as above formula (2).

[0273] [Mathematical formula 12]

[0274]

[0275] The tissue points on the back (number / 25.4 mm square) = G R ×I R =53×46=2438

[0276] Organization points (pcs / 25.4mm square) = 2133.25 + 2438 = 4571.25

[0277] In Comparative Example 4, the number of tissue point fibers and the number of tissue points were calculated on the front and back sides, respectively, and the sum of the two was calculated. Fig.12 and Fig.13 As shown, the number of wound threads is different at the tissue points without tuck (non-tuck tissue points) and the tissue points with tuck (tuck tissue points). At the non-tuck tissue points, two threads, the surface thread and the surface thread, are wound. At the tuck tissue points, three threads, two surface threads and one connecting thread, are wound. In addition, among the 2133.25 tissue points on the surface, the number of tuck tissue points is 304.75 (=53 / 4×46 / 2), and the number of non-tuck tissue points is 1828.5 (=2133.25-304.75). On the other hand, with respect to the back side, the number of tissue points is 2438, and at each tissue point, two threads, the back thread and the connecting thread, are wound. Therefore, the number of fibers at the tissue points is calculated using the following formula.

[0278] [Mathematical formula 13]

[0279] The number of fibers at the surface tissue point (roots / 25.4 mm square) = 1828.5×(216+216)+304.75×(216+216+216)

[0280] =987390

[0281] The number of fibers at the tissue point on the back (roots / 25.4 mm square) = 2438 × (36 + 216) = 614376

[0282] Number of fibers at tissue point (roots / 25.4 mm square) = 987390 + 614376 = 1601766

[0283] [Table 6]

[0284]

[0285] [Table 7]

[0286]

[0287] [Table 8]

[0288]

[0289] The results are shown in Tables 6 to 8. In the imitation suede leather sheet of Comparative Example 4, a knitted fabric is used as the fibrous base material, but the knitting structure is a tuck structure. In the tuck structure, one or more rows of stitches are skipped to form a needle loop, so the filling rate of the needle loop is low, and the needle loop is easily deformed, so it is considered that the constant load setting rate becomes large. In Comparative Example 4, since the constant load setting rate is high, when tension is applied to the sheet and attached to the seat, the elongation caused by the tension is not fully recovered, and wrinkles are easily generated in the sheet, so the surface tracking property is deteriorated.

[0290] In the imitation suede leather sheet of Comparative Example 5, a woven fabric is used as a fibrous base material, but the number of tissue points of 25.4 mm square is small, so fatigue durability, fatigue strength and surface appearance are poor. In the imitation suede leather sheet of Comparative Example 6, the number of tissue points of 25.4 mm square is too large, so the hand feel is poor. In the imitation suede leather sheet of Comparative Example 7, the number of fibers of tissue points of 25.4 mm square is small, so the touch and surface appearance are poor. In the imitation suede leather sheet of Comparative Example 8, the number of fibers of tissue points of 25.4 mm square is too large, so the hand feel is poor.

[0291] In contrast, the imitation suede leather sheets of Examples 13 to 21 have a surface appearance and feel comparable to those of artificial leather, and have no hair loss due to wear, and are excellent in fatigue durability, fatigue strength, and wear resistance. In addition, Examples 13 to 21 have high constant load elongation and low constant load setting rate, and therefore have excellent surface followability.

[0292] Explanation of symbols

[0293] 10…imitation suede leather sheet, 11…surface, 12…fiber base material, 13…back surface, 14…suede, 16…suede surface

Claims

1. A simulated pile leather sheet, comprising: A fibrous substrate as a woven or knitted fabric, and a resin applied to the fibrous substrate, The imitation suede leather sheet is characterized in that: The sheet-like article has a napped surface having naps on its surface, wherein the naps are formed of fibers constituting the fibrous base material and the resin is attached thereto. The number of tissue points constituting the thread of the fibrous base material in the sheet-like material of 24.5 mm square is 1,500 to 10,000 when the fibrous base material is a woven fabric, and is 3,000 to 9,000 when the fibrous base material is a knitted fabric. The total number of fibers that cross or entangle at the tissue point in each 24.5 mm square sheet is 396,000 to 2,640,000 when the fibrous base material is a woven fabric, and is 912,000 to 8,208,000 when the fibrous base material is a woven fabric. The constant load elongation is greater than 5% in both the warp and weft directions of the sheet, and the constant load setting rate is less than 10% in both the warp and weft directions of the sheet.

2. The imitation suede leather sheet according to claim 1, characterized in that: When the fibrous base material is a woven fabric, the number of tissue points constituting the threads of the fibrous base material per 24.5 mm square sheet is 3,500 to 9,000.

3. The imitation suede leather sheet according to claim 1, characterized in that: The fibrous substrate is a circular woven fabric.

4. The imitation suede leather sheet according to claim 1, characterized in that: The fibrous base material is a double-sided woven fabric.

5. The imitation suede leather sheet according to claim 1, characterized in that: The fibrous substrate is a satin-woven multi-textile.

6. The imitation suede leather sheet according to claim 1, characterized in that: The resin is present at least on the surface side where the erected naps are present in the thickness direction of the fibrous base material.

7. The imitation suede leather sheet according to claim 1, characterized in that: The resin is a single polyurethane resin, or a mixture of a silicone resin and a polyurethane resin.

8. The imitation suede leather sheet according to claim 1, characterized in that: No upright naps are formed on the back side of the sheet-like material, and a backing is provided on the back side.

9. The imitation suede leather sheet according to claim 8, characterized in that: The backing includes a flame retardant and a binder resin.

10. The imitation suede leather sheet according to claim 1, characterized in that: Regarding the density of the fibrous substrate, when the fibrous substrate is a woven fabric, the warp density is 200 to 500 strands / 25.4 mm and the weft density is 50 to 150 strands / 25.4 mm. When the fibrous substrate is a knitted fabric, the density of the fibrous substrate is 40 to 110 horizontal rows / 25.4 mm and 30 to 70 vertical rows / 25.4 mm.

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