Breathable elastic composite nonwoven fabric and manufacturing method thereof

Abstract

The invention discloses a breathable elastic composite nonwoven fabric, which is composed of a surface layer nonwoven fabric, an intermediate layer elastic film and a bottom layer nonwoven fabric. Both the surface layer nonwoven fabric and the bottom layer nonwoven fabric are provided with a plurality of strip-type raised areas and recessed areas arranged transversely, the intermediate layer elastic film is provided with funnel-shaped openings, and the surface layer nonwoven fabric and the bottom layer nonwoven fabric form a strip-type air-permeable channel between the raised areas, so that when worn, internal humid and hot air can penetrate into the air-permeable channel space formed by the bottom layer nonwoven fabric and the elastic film through the bottom layer nonwoven fabric, the humid and hot air can diffuse rapidly in the air-permeable channel in the length direction and the height direction of the air-permeable channel space, and enter into the air-permeable channel space formed by the elastic film and the surface layer nonwoven fabric through the openings of the elastic film, and then be discharged from the elastic composite nonwoven fabric, thereby achieving the effect of rapid heat conduction and moisture removal.

Description

Technical Field

[0001] The invention relates to the field of nonwoven fabrics, and in particular to a breathable elastic composite nonwoven fabric used in absorbent products and personal care products and a manufacturing method thereof. Background Art

[0002] Elastic composite nonwoven fabric or elastic nonwoven fabric has soft texture, environmental protection, non-toxic breathability, natural antibacterial characteristics, and is widely used in elastic bandages, baby diapers, adult incontinence pants waist, etc. Especially when used in the elastic waist of diapers, it has moderate elasticity, is not loose, and does not tighten the skin, and the nonwoven fabric in contact with the skin is soft and comfortable.

[0003] Existing elastic composite nonwoven fabrics are mainly composed of a surface layer or a bottom layer of nonwoven fabrics, and an elastic film in the middle layer. The elastic film in the middle has poor air permeability. When used in the elastic waistband of diapers, it is difficult to discharge the hot air inside the waistband to the outside of the waistband, making the wearer feel stuffy and airtight, and it is easy to breed bacteria, thereby causing skin allergies. Summary of the invention

[0004] The object of the present invention is to provide a soft, breathable elastic composite nonwoven fabric and a method for manufacturing the same, so as to overcome the defects of existing products and production methods.

[0005] To achieve the above object, the solution of the present invention is:

[0006] A breathable elastic composite nonwoven fabric, the breathable elastic composite nonwoven fabric is composed of a surface layer nonwoven fabric, an intermediate layer elastic film and a bottom layer nonwoven fabric, the surface layer nonwoven fabric and the bottom layer nonwoven fabric are both provided with a plurality of transversely arranged strip-like raised areas and recessed areas, the intermediate layer elastic film is provided with funnel-shaped openings, the recessed areas of the surface layer nonwoven fabric and the bottom layer nonwoven fabric are respectively composited on the top and bottom surfaces of the funnel-shaped openings of the intermediate layer elastic film, and the composite positions correspond to each other up and down, the surface layer nonwoven fabric and the bottom layer nonwoven fabric form a strip-like air permeable channel between the raised areas, the strip-like air permeable channel includes the air permeable channel space formed by the surface layer nonwoven fabric and the intermediate layer elastic film, and the air permeable channel space formed by the bottom layer nonwoven fabric and the intermediate layer elastic film, wherein: the spacing between adjacent strip-like recessed areas is 2mm-10mm, and the density of the funnel-shaped openings on the intermediate layer elastic film is 20-1600 / cm 2 , the top surface area of ​​a single opening is 0.03mm 2 ~2.5mm 2 .

[0007] Preferably, the non-woven fabrics of the surface layer and the bottom layer are hot air non-woven fabrics, spunbond non-woven fabrics, spunlace non-woven fabrics or meltblown non-woven fabrics.

[0008] Preferably, the intermediate elastic film comprises a thermoplastic elastic resin, and the thermoplastic elastic resin is a thermoplastic polystyrene elastomer, a thermoplastic polyolefin elastomer or a thermoplastic polyurethane elastomer.

[0009] Preferably, the surface layer non-woven fabric also has an open-pore structure.

[0010] Preferably, the bottom nonwoven fabric also has an open-pore structure.

[0011] Preferably, the spacing between adjacent strip-shaped recessed areas is 3 mm-8 mm.

[0012] Preferably, the single strip-like raised area or recessed area is continuous or discontinuous.

[0013] The present invention also provides a method for manufacturing a breathable elastic composite nonwoven fabric, the specific steps of which are:

[0014] (1) Elastic film opening process: a thermoplastic elastic resin is melt-extruded through a screw extruder to form an elastic cast film; the elastic cast film enters a vacuum opening device, which is composed of a vacuum pump, a molding drum connected to the vacuum pump, and a molding mesh cage located outside the molding drum. When the elastic film enters the vacuum suction port of the vacuum opening device, a plurality of funnel-shaped openings are formed on the surface due to the pressure difference between the inside and outside, thereby forming an elastic film with funnel-shaped openings, wherein: the shape of the funnel-shaped openings is consistent with the shape of the holes on the molding mesh cage located outside the molding drum;

[0015] (2) Elastic Film Transverse Stretching Process: After the elastic film with the funnel-shaped opening enters a transverse stretching device composed of a plurality of clamps located on both sides of the elastic film, the two sides are clamped by the plurality of clamps, and the transverse width is gradually increased, and is gradually stretched from an unstretched state to 200%-300% of the original transverse width;

[0016] (3) Laminating step: the surface layer nonwoven fabric and the bottom layer nonwoven fabric enter the laminating device from the upper and lower sides of the elastic film with funnel-shaped openings in the stretched state, and are laminated with the elastic film with funnel-shaped openings in the stretched state through hot pressing to form the elastic composite nonwoven fabric in the stretched state, wherein: the concave areas of the surface layer nonwoven fabric and the bottom layer nonwoven fabric are laminated on the top and bottom surfaces of the funnel-shaped openings of the intermediate layer elastic film, respectively, and the laminating positions correspond to each other up and down;

[0017] (4) The shrinkage molding process loosens the multiple sets of clamps on both sides of the elastic composite nonwoven fabric in a stretched state, so that the width of the elastic composite nonwoven fabric shrinks to an unstretched state, forming an elastic composite nonwoven fabric with multiple strip-like raised areas and recessed areas arranged laterally on the surface layer nonwoven fabric and the bottom layer nonwoven fabric, and funnel-shaped openings on the middle layer elastic film, and then trims the edges and rolls up.

[0018] Preferably, the composite device in step (3) is composed of a pair of smooth rollers; the surface layer non-woven fabric and the bottom layer non-woven fabric are first sprayed with glue by a fixed-point spraying device respectively, and then enter the composite device, and are hot-pressed and composited with the elastic film with funnel-shaped openings in a stretched state at the hot-pressing position of the fixed-point spraying position to form the elastic composite non-woven fabric in a stretched state.

[0019] Preferably, in the step (3), the distance between adjacent glue spraying ports in the fixed-point glue spraying device is 4 mm-30 mm.

[0020] Preferably, in the step (3), the distance between adjacent glue spraying ports in the fixed-point glue spraying device is 6 mm-24 mm.

[0021] Preferably, the composite device in step (3) is composed of a pair of convex rollers and smooth rollers, and the surface layer non-woven fabric and the bottom layer non-woven fabric enter the composite device respectively, are hot-pressed and composited with the elastic film with funnel-shaped openings in a stretched state at the convex roller hot-pressing position to form the elastic composite non-woven fabric in a stretched state.

[0022] Preferably, the convex roller of the composite device in step (3) has a plurality of continuous or discontinuous annular protrusions distributed along the axial direction.

[0023] Preferably, in the step (3), the distance between adjacent annular protrusions distributed along the axial direction on the convex roller of the composite device is 4 mm-30 mm.

[0024] Preferably, in the step (3), the distance between the annular protrusions distributed along the axial direction on the convex roller of the composite device is 6 mm-24 mm.

[0025] Preferably, the surface layer non-woven fabric and the bottom layer non-woven fabric are respectively sprayed with glue by a fixed-point glue spraying device before entering a composite device composed of a pair of convex rollers and a smooth roller.

[0026] Preferably, the distance between adjacent glue spraying ports of the fixed-point glue spraying device is consistent with the distance between adjacent annular protrusions distributed along the axial direction on the convex roller.

[0027] Preferably, in the step (3), the surface layer nonwoven fabric first enters a punching device consisting of a pair of needle rollers and a concave roller to perform a hole-making process before entering the compounding device.

[0028] Preferably, in the step (3), the bottom nonwoven fabric first enters a punching device consisting of a pair of needle rollers and a concave roller to perform a hole-making process before entering the compounding device.

[0029] After adopting the above scheme, the middle layer of the elastic composite nonwoven fabric of the present invention is an elastic film with funnel-shaped openings, and the surface layer and the bottom layer nonwoven fabric have multiple strip-like raised areas and recessed areas arranged laterally. The elastic film with funnel-shaped openings has moderate elasticity, which makes people feel free from restraint, oppression, and relaxation, effectively preventing the pain caused by compression of human blood vessels and nerves due to poor elasticity, and improving wearing comfort; and the presence of the openings greatly increases the air permeability of the elastic composite nonwoven fabric, and the continuous strip-like air permeable channels formed between the raised areas of the surface layer nonwoven fabric and the bottom layer nonwoven fabric can penetrate the internal humid and hot air into the air permeable channel space formed by the bottom layer nonwoven fabric and the elastic film when worn, and the humid and hot air quickly vents in the air permeable channel space. The moisture rapidly spreads in the length and height directions, enters into the air permeable channel space formed by the elastic film and the surface non-woven fabric through the openings of the elastic film, and then is discharged from the elastic composite non-woven fabric, thereby achieving the effect of rapid heat conduction and moisture removal; the funnel shape formed by the vacuum opening device has uniform openings and neat opening edges, which is not easy to produce stress concentration, thereby greatly reducing the risk of tearing of the elastic film during stretching; at the same time, the surface layer and the bottom layer of the non-woven fabric are soft to the touch, skin-friendly and breathable when in contact with the skin, and will not cause erythema, allergies and other symptoms caused by long-term contact with the skin, and because the surface layer and the bottom layer are made of non-woven fabrics, when used in personal care products, especially diapers, it is easier to compound with the main part of the diaper, increase its composite strength, and prevent breakage during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a breathable elastic composite nonwoven fabric according to Example 1 of the present invention;

[0031] Figure 2 This is a cross-sectional view of the breathable elastic composite nonwoven fabric of Example 1 of the present invention;

[0032] Figure 3 It is a schematic diagram of the stretching device of the present invention;

[0033] Figure 4 This is a schematic diagram of manufacturing the breathable elastic composite nonwoven fabric according to Example 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of a breathable elastic composite nonwoven fabric according to Example 2 of the present invention;

[0035] Figure 6 This is a cross-sectional view of the breathable elastic composite nonwoven fabric of Example 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of manufacturing the breathable elastic composite nonwoven fabric according to Example 2 of the present invention;

[0037] Figure 8 This is a schematic diagram of a breathable elastic composite nonwoven fabric according to Example 3 of the present invention;

[0038] Fig. 9 This is a cross-sectional view of the breathable elastic composite nonwoven fabric of Example 3 of the present invention;

[0039] Fig.10 This is a schematic diagram of manufacturing the breathable elastic composite nonwoven fabric according to Example 3 of the present invention.

[0040] Explanation of symbols

[0041] Embodiment 1:

[0042] 41 Elastic nonwoven fabric

[0043] 11 Surface non-woven fabric 21 Bottom non-woven fabric

[0044] 31 Elastic film

[0045] a1, b1 raised area c1, d1 recessed area

[0046] e1 Funnel-shaped opening

[0047] x1 Breathable channel space formed by the surface layer nonwoven fabric 11 and the middle layer elastic film 31

[0048] y1 The air permeable channel space formed by the bottom nonwoven fabric 21 and the middle elastic film 31

[0049] A1 Screw Extruder B1 Forming Drum

[0050] C1 Forming cage D1 Vacuum suction port

[0051] E1 Transverse stretching device F1 Clamp

[0052] G1, G1' fixed-point glue spraying device H1 composite device

[0053] Embodiment 2:

[0054] 42 elastic nonwoven fabric

[0055] 12 Surface non-woven fabric 22 Bottom non-woven fabric

[0056] 32 Elastic film

[0057] a2, b2 raised area c2, d2 recessed area

[0058] e2 Funnel-shaped opening f2 Opening structure on the surface nonwoven fabric

[0059] x2 The air permeable channel space formed by the surface layer nonwoven fabric 12 and the middle layer elastic film 32

[0060] y1 The air permeable channel space formed by the bottom nonwoven fabric 22 and the middle elastic film 32

[0061] A2 Screw Extruder B2 Forming Drum

[0062] C2 Forming Cage D2 Vacuum Suction Port

[0063] E2 Transverse stretching device F2 clamp

[0064] H2 Compounding Device J2 Needle Roller

[0065] I2 Concave roller K2 Convex roller in compounding device

[0066] L2 Bar in compound device M2 Protrusion on convex roller

[0067] Embodiment 3:

[0068] 43 Elastic nonwoven fabric

[0069] 13 Surface non-woven fabric 23 Bottom non-woven fabric

[0070] 33 Elastic film

[0071] a3, b3 raised area c3, d3 recessed area

[0072] e3 Funnel-shaped opening f3 Opening structure on the surface nonwoven fabric

[0073] g3 Open-pore structure on the bottom nonwoven fabric

[0074] x3 The air permeable channel space formed by the surface layer nonwoven fabric 13 and the middle layer elastic film 33

[0075] y3 The air permeable channel space formed by the bottom nonwoven fabric 23 and the middle elastic film 33

[0076] A3 Screw Extruder B3 Forming Drum

[0077] C3 Forming Cage D3 Vacuum Suction Port

[0078] E3 Transverse stretching device F3 clamp

[0079] G3, G3' fixed-point glue spraying device

[0080] H3 composite device J3, N3 needle roller

[0081] I3, O3 concave roller

[0082] K3 convex rollers in the compounding unit

[0083] L3 Protrusions on the M3 convex roller in the composite device. DETAILED DESCRIPTION

[0084] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0085] Cooperate Figure 1 and Figure 2 As shown, the present invention discloses a breathable elastic composite nonwoven fabric 41, wherein the breathable elastic composite nonwoven fabric 41 is composed of a surface layer nonwoven fabric 11, an intermediate layer elastic film 31 and a bottom layer nonwoven fabric 21, wherein the surface layer nonwoven fabric 11 and the bottom layer nonwoven fabric 21 both have a plurality of strip-like raised areas a1, b1 and recessed areas c1, d1 arranged transversely, the intermediate layer elastic film 31 has a funnel-shaped opening e1, and the recessed areas c1, d1 of the surface layer nonwoven fabric 11 and the bottom layer nonwoven fabric 21 are respectively composited on the funnel-shaped opening of the intermediate layer elastic film 31. The top and bottom of the hole are on the surface, and the composite positions correspond to each other. The surface non-woven fabric 11 and the bottom non-woven fabric 21 form a strip-type air-permeable channel between the raised areas a1 and b1. The strip-type air-permeable channel includes the air-permeable channel space x1 formed by the surface non-woven fabric 11 and the middle elastic film 31 and the air-permeable channel space y1 formed by the bottom non-woven fabric 21 and the middle elastic film 31, wherein: the spacing between adjacent strip-type concave areas is 5 mm, and the funnel-shaped opening density on the middle elastic film 31 is 100 / cm 2 , the top surface area of ​​a single opening is 0.45mm 2 .

[0086] Cooperate Figure 3 As shown, after the middle layer elastic film 31 (32, 33) enters the transverse stretching device E1 (E2, E3) composed of multiple groups of clamps F1 (F2, F3) located on both sides of the elastic film, the two side surfaces are clamped by the multiple groups of clamps F1 (F2, F3), and the transverse width is gradually increased, and it is gradually stretched from the unstretched state width L0. The stretched width L1 is 200%-300% of the original transverse unstretched width L0, and when the width L1 is stretched, it is composited with the surface layer non-woven fabric and the bottom layer non-woven fabric through the composite device H1 (H2, H3), and then the multiple groups of clamps F1 (F2, F3) on both sides of the elastic composite non-woven fabric in the stretched state width L1 are loosened, so that the width of the elastic composite non-woven fabric shrinks to the unstretched state width L0.

[0087] Tensile strength at 25%, 50%, and 100% deformation,

[0088] Testing equipment: XLW (EC) intelligent electronic tensile testing machine,

[0089] Test sample: 5 pieces of 25.4mm×150mm elastic composite non-woven fabric,

[0090] Test steps: Adjust the distance between the test machine's fixtures to 50mm, and fix the sample between the two fixtures to make it straight and not stretched. After clicking the "Fixed tensile strength" option, the fixture on the upper end of the test machine stretches the sample at a stretching speed of 500mm / min, and records the tensile strength values ​​when the stretching deformation is 25%, 50%, and 100%.

[0091] Irrecoverable deformation test at 50% deformation,

[0092] Testing equipment: XLW (EC) intelligent electronic tensile testing machine,

[0093] Test sample: 5 pieces of 25.4mm×150mm elastic composite non-woven fabric,

[0094] Test steps: Adjust the distance between the test machine's clamps to 50mm, and fix the sample between the two clamps so that it is straight and not stretched. The clamp at the upper end of the test machine stretches the sample at a stretching speed of 500mm / min. When it is stretched to 50% of the sample's clamping length, keep the fixed force for 1 minute, and immediately return to zero position at the same speed and stay for 1 minute; then stretch it for the second time at the same stretching speed, stretch it to 25% of the sample's clamping length and stay for 1 minute, and then return to zero position at the same speed. Measure the displacement value on the tension and displacement curve when the tension starts at the beginning of the second stretch.

[0095] Result calculation and presentation:

[0096] The specimen cannot be recovered when it is 50% deformed:

[0097]

[0098] Where M1 is the length of the sample clamp, mm;

[0099] M2 - displacement value of the sample on the tension and displacement curve when the second tension starts, mm.

[0100] Breathable performance,

[0101] Test instrument: FX3300-IV air permeability tester,

[0102] Test sample: 5 pieces of 10cm×10cm elastic composite non-woven fabric,

[0103] Test steps: Place the test sample in a laboratory with an ambient temperature of (23±2)℃ and a relative humidity of (50±2)% for at least two hours. 2 Install the clamp arm on the upper test head and connect the high-pressure rubber tube to the test head. 2 Fix the lower test head in the sample diameter setting circle and connect the high-pressure rubber tube to the lower test head. Set the experimental conditions: Select the unit as: m 3 / m 2 / min Test pressure: 125Pa. Place the sample face flat on the lower test head, press the clamp arm to start the test, and record the reading when the indicator light of the correct test range tends to be stable and shows green.

[0104] Example 1

[0105] like Figure 4 And cooperate Figure 1 , Figure 2 and Figure 3 As shown, the breathable elastic composite nonwoven fabric of Example 1 of the present invention is manufactured by the following method:

[0106] (1) Elastic film opening process: Thermoplastic polyurethane elastomer (TPU) is melt-extruded through a screw extruder A1 to form an elastic cast film; the elastic cast film enters a vacuum opening device, which is composed of a vacuum pump (not shown in the figure), a molding drum B1 connected to the vacuum pump, and a molding mesh cylinder C1 located outside the molding drum. When the elastic film enters the vacuum suction port D1 of the vacuum opening device, a plurality of funnel-shaped openings e1 are formed on the surface due to the pressure difference between the inside and outside, thereby forming an elastic film 31 having funnel-shaped openings e1, wherein: the shape of the funnel-shaped openings e1 is consistent with the shape of the holes on the molding mesh cylinder C1 located outside the molding drum B1;

[0107] (2) Elastic Film Transverse Stretching Process After the elastic film 31 having the funnel-shaped opening e1 enters the transverse stretching device E1 composed of a plurality of clamps F1 located on both sides of the elastic film 31, the two sides are clamped by the plurality of clamps F1, and the transverse width is gradually increased, and is gradually stretched from the unstretched state to 200% of the original transverse width;

[0108] (3) Laminating process: After the surface layer non-woven fabric 11 and the bottom layer non-woven fabric 21 are respectively sprayed with glue by the fixed-point glue spraying devices G1 and G1', they enter the laminating device H1 composed of a pair of smooth rollers from the upper and lower sides of the elastic film 31 with the funnel-shaped opening e1 in a stretched state, and are laminated with the elastic film 31 with the funnel-shaped opening e1 in a stretched state at the fixed-point glue spraying position through hot pressing, so as to form an elastic composite non-woven fabric 41 in a stretched state, wherein: the concave areas c1 and d1 of the surface layer non-woven fabric 11 and the bottom layer non-woven fabric 21 are respectively laminated on the top and bottom surfaces of the funnel-shaped opening e1 of the intermediate layer elastic film 31, and the laminating positions correspond to each other from top to bottom, wherein: the surface layer non-woven fabric 11 and the bottom layer non-woven fabric 21 can be one or two of hot air non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric or meltblown non-woven fabric, and the distance between adjacent glue spraying ports in the fixed-point glue spraying devices G1 and G1' is 10 mm;

[0109] (4) The shrinkage molding process loosens the multiple sets of clamps F1 on both sides of the elastic composite non-woven fabric 41 in a stretched state, so that the width of the elastic composite non-woven fabric 41 shrinks to an unstretched state, forming an elastic composite non-woven fabric 41 having multiple horizontally arranged strip-like raised areas a1, b1 and recessed areas c1, d1 on the surface layer non-woven fabric 11 and the bottom layer non-woven fabric 31, and a funnel-shaped opening e1 on the middle layer elastic film 31, and then trimming and rolling up.

[0110] Example 2

[0111] like Figure 5 , Figure 6 , Figure 7 ,Cooperate Figure 3As shown, the present invention discloses a breathable elastic composite non-woven fabric 42, wherein the breathable elastic composite non-woven fabric 42 is composed of a surface layer non-woven fabric 12, an intermediate layer elastic film 32 and a bottom layer non-woven fabric 22, wherein both the surface layer non-woven fabric 12 and the bottom layer non-woven fabric 22 have a plurality of transversely arranged strip-like raised areas a2, b2 and recessed areas c2, d2, and the surface layer non-woven fabric 12 also has an open hole structure f2, and the intermediate layer elastic film 32 has a funnel-shaped opening e2, and the recessed areas c2, d2 of the surface layer non-woven fabric 12 and the bottom layer non-woven fabric 22 are respectively composited on the top and bottom of the funnel-shaped opening e2 of the intermediate layer elastic film 32 The surface is located, and the composite position corresponds to each other up and down. The surface layer non-woven fabric 12 and the bottom layer non-woven fabric 22 form a strip-type air-permeable channel between the raised areas a2 and b2. The strip-type air-permeable channel includes the air-permeable channel space x2 formed by the surface layer non-woven fabric 12 and the middle layer elastic film 32 and the air-permeable channel space y2 formed by the bottom layer non-woven fabric 22 and the middle layer elastic film 32, wherein: the spacing between the adjacent strip-type recessed areas c2 and d2 is 8 mm, and the single strip-type raised areas a2, b2 or the recessed areas c2, d2 are discontinuous, and the funnel-shaped opening density on the middle layer elastic film 31 is 132 / cm 2 , the top surface area of ​​a single opening is 0.36mm 2 .

[0112] The breathable elastic composite nonwoven fabric of Example 2 of the present invention is manufactured by the following method:

[0113] (1) Elastic film opening process: Thermoplastic polystyrene elastomer (TPE) is melt-extruded through a screw extruder A2 to form an elastic cast film; the elastic cast film enters a vacuum opening device, which is composed of a vacuum pump (not shown in the figure), a molding drum B2 connected to the vacuum pump, and a molding mesh cylinder C2 located outside the molding drum. When the elastic film enters the vacuum suction port D2 of the vacuum opening device, a plurality of funnel-shaped openings e2 are formed on the surface due to the pressure difference between the inside and outside, thereby forming an elastic film 32 having funnel-shaped openings e2, wherein the shape of the funnel-shaped openings e2 is consistent with the shape of the holes on the molding mesh cylinder C2 located outside the molding drum B2;

[0114] (2) Elastic Film Transverse Stretching Process After the elastic film 32 having the funnel-shaped opening e2 enters the transverse stretching device E2 composed of a plurality of clamps F2 located on both sides of the elastic film 32, the two sides are clamped by the plurality of clamps F2, and the transverse width is gradually increased, and is gradually stretched from the unstretched state to 270% of the original transverse width;

[0115] (3) Laminating process: After the surface layer nonwoven fabric 12 is perforated by a punching device consisting of a pair of needle rollers J2 and a concave roller I2, it and the bottom layer nonwoven fabric 22 enter the laminating device H2 consisting of a pair of convex rollers K2 and a smooth roller L2 from the upper and lower sides of the elastic film 32 with the funnel-shaped opening e2 in a stretched state, respectively, wherein: the single protrusion on the convex roller K2 is an intermittent annular protrusion, which is laminated by hot pressing and laminated with the elastic film 32 with the funnel-shaped opening e2 in a stretched state at the position of the protrusion hot pressing. Together, an elastic composite nonwoven fabric 42 in a stretched state is formed, wherein: the concave areas c2 and d2 of the surface layer nonwoven fabric 12 and the bottom layer nonwoven fabric 22 are respectively composited on the top and bottom surfaces of the funnel-shaped opening e2 of the intermediate layer elastic film 32, and the composite positions correspond to each other up and down, the surface layer nonwoven fabric 12 and the bottom layer nonwoven fabric can be one or two of hot air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric or meltblown nonwoven fabric, and the distance between adjacent annular protrusions on the convex roller K2 is 20.8 mm;

[0116] (4) In the shrinkage molding process, the multiple sets of clamps F2 on both sides of the elastic composite non-woven fabric 42 in a stretched state are loosened to shrink the width of the elastic composite non-woven fabric 42 to an unstretched state, thereby forming an elastic composite non-woven fabric 42 having a plurality of transversely arranged strip-like raised areas a2, b2 and recessed areas c2, d2 on both the surface layer non-woven fabric 12 and the bottom layer non-woven fabric 22, and an open hole structure f3 on the surface layer non-woven fabric 12, and a funnel-shaped opening e2 on the middle layer elastic film 32, and then the elastic composite non-woven fabric 42 is trimmed and rolled up.

[0117] Example 3

[0118] like Figure 8 , Fig. 9 , Fig.10 ,Cooperate Figure 3As shown, the present invention discloses a breathable elastic composite non-woven fabric 43, the breathable elastic composite non-woven fabric 43 is composed of a surface layer non-woven fabric 13, an intermediate layer elastic film 33 and a bottom layer non-woven fabric 23, the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23 both have a plurality of strip-like raised areas a3, b3 and recessed areas c3, d3 arranged transversely, and the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23 also have open hole structures f3, g3, the intermediate layer elastic film 33 has a funnel-shaped opening e3, the recessed areas c3, d3 of the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23 are respectively composited on the funnel-shaped opening e3 of the intermediate layer elastic film 33 The top and bottom of the composite position correspond to each other, and the surface non-woven fabric 13 and the bottom non-woven fabric 23 form a strip-type air-permeable channel between the raised areas a3 and b3, and the strip-type air-permeable channel includes the air-permeable channel space x3 formed by the surface non-woven fabric 13 and the middle elastic film 33 and the air-permeable channel space y3 formed by the bottom non-woven fabric 23 and the middle elastic film 33, wherein: the spacing between adjacent strip-type recessed areas c3 and d3 is 6 mm, and the single strip-type raised areas a3, b3 or recessed areas c3, d3 are discontinuous, and the funnel-shaped opening density on the middle elastic film 33 is 50 / cm 2 , the top surface area of ​​a single opening is 1.5mm 2 .

[0119] The breathable elastic composite nonwoven fabric of Example 3 of the present invention is manufactured by the following method:

[0120] (1) Elastic film opening process: Thermoplastic polystyrene elastomer (TPE) is melt-extruded through a screw extruder A3 to form an elastic cast film; the elastic cast film enters a vacuum opening device, which is composed of a vacuum pump (not shown in the figure), a molding drum B3 connected to the vacuum pump, and a molding mesh cylinder C3 located outside the molding drum. When the elastic film enters the vacuum suction port D3 of the vacuum opening device, a plurality of funnel-shaped openings e3 are formed on the surface due to the pressure difference between the inside and outside, thereby forming an elastic film 33 having funnel-shaped openings e3, wherein the shape of the funnel-shaped openings e3 is consistent with the shape of the holes on the molding mesh cylinder C3 located outside the molding drum B3;

[0121] (2) Elastic Film Transverse Stretching Process After the elastic film 33 having the funnel-shaped opening e3 enters the transverse stretching device E3 composed of a plurality of clamps F3 located on both sides of the elastic film 33, the two sides are clamped by the plurality of clamps F3, and the transverse width is gradually increased, and is gradually stretched from the unstretched state to 300% of the original transverse width;

[0122] (3) Laminating process The surface layer nonwoven fabric 13 is perforated by a punching device consisting of a pair of needle rollers J3 and a concave roller 13, and the bottom layer nonwoven fabric 22 is perforated by a punching device consisting of a pair of needle rollers N3 and a concave roller O3, and then respectively sprayed with glue by fixed-point glue spraying devices G3 and G3', and then respectively enter the laminating device H3 consisting of a pair of convex rollers K3 and a smooth roller L3 from the upper and lower sides of the elastic film 33 with the funnel-shaped opening e3 in a stretched state, wherein: the single protrusion on the convex roller K3 is an intermittent annular protrusion, which is laminated with the elastic film 33 with the funnel-shaped opening e3 in a stretched state through hot pressing. 3 are compounded together at the positions of the raised hot pressing and fixed-point glue spraying to form an elastic composite non-woven fabric 43 in a stretched state, wherein: the concave areas c3 and d3 of the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23 are respectively compounded on the top and bottom surfaces of the funnel-shaped opening e3 of the intermediate layer elastic film 33, and the compounding positions correspond to each other one by one, the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23 can be one or two of hot air non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric or melt-blown non-woven fabric, the distance between adjacent annular protrusions on the convex roller K3 is 18 mm, and the distance between adjacent fixed-point glue spraying ports is 18 mm;

[0123] (4) In the shrinkage molding process, the multiple sets of clamps F3 on both sides of the elastic composite non-woven fabric 43 in a stretched state are loosened to shrink the width of the elastic composite non-woven fabric 43 to an unstretched state, thereby forming an elastic composite non-woven fabric 43 having a plurality of transversely arranged strip-like raised areas a3, b3 and recessed areas c3, d3 on both the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23, and having open hole structures f3, g3 on both the surface layer non-woven fabric 13 and the bottom layer non-woven fabric 23, and having a funnel-shaped opening e3 on the middle layer elastic film 33, and then the elastic composite non-woven fabric 43 is trimmed and rolled up.

[0124] The properties of the elastic composite nonwoven fabrics manufactured by Example 1 and Example 2 are tested as follows:

[0125]

[0126] It can be seen from the above data that the middle layer of the breathable elastic composite non-woven fabric of the present invention is an elastic film with funnel-shaped openings. The elastic film with funnel-shaped openings has moderate elasticity, which makes people feel free from restraint, oppression, and relaxation, effectively preventing the pain caused by compression of human blood vessels and nerves due to poor elasticity, and improving the wearing comfort; the continuous strip-type air permeable channel formed between the surface non-woven fabric and the bottom non-woven fabric between the raised areas can penetrate the internal humid and hot air through the bottom non-woven fabric into the air permeable channel space formed by the bottom non-woven fabric and the elastic film when worn, and the humid and hot air quickly diffuses in the length direction and height direction of the air permeable channel space, and enters the air permeable channel space formed by the elastic film and the surface non-woven fabric through the openings of the elastic film, and then is discharged from the elastic composite non-woven fabric, thereby achieving the effect of rapid heat conduction and moisture removal; the surface non-woven fabric and the bottom non-woven fabric in Examples 2 and 3 also have an open-pore structure, which further improves the air permeability of the elastic composite non-woven fabric. In the manufacturing process of the elastic composite nonwoven fabric, fixed-point spraying composite, convex roller hot pressing composite or a combination of the two can be adopted, and by changing the position of the annular protrusion on the composite convex roller, an elastic composite nonwoven fabric with continuous or discontinuous air permeable channels can be obtained.

[0127] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A breathable elastic composite nonwoven fabric, characterized in that: The breathable elastic composite non-woven fabric is composed of a surface layer non-woven fabric, an intermediate layer elastic film and a bottom layer non-woven fabric. The surface layer non-woven fabric and the bottom layer non-woven fabric are both provided with a plurality of transversely arranged strip-like raised areas and recessed areas. The intermediate layer elastic film is provided with a funnel-shaped opening. The recessed areas of the surface layer non-woven fabric and the bottom layer non-woven fabric are respectively composited on the top and bottom surfaces of the funnel-shaped opening of the intermediate layer elastic film, and the composite positions correspond to each other up and down. The surface layer non-woven fabric and the bottom layer non-woven fabric form a strip-like breathable channel between the raised areas. The strip-like breathable channel includes the breathable channel space formed by the surface layer non-woven fabric and the intermediate layer elastic film and the breathable channel space formed by the bottom layer non-woven fabric and the intermediate layer elastic film, wherein: the spacing between adjacent strip-like recessed areas is 2mm-10mm, and the density of the funnel-shaped openings on the intermediate layer elastic film is 20 to 1600 per cm 2 , the top surface area of ​​a single opening is 0.03mm 2 ~2.5mm 2 .

2. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: The non-woven fabrics of the surface layer and the bottom layer are hot air non-woven fabrics, spunbond non-woven fabrics, spunlace non-woven fabrics or meltblown non-woven fabrics.

3. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: The elastic film of the middle layer contains thermoplastic elastic resin, and the thermoplastic elastic resin is thermoplastic polystyrene elastomer, thermoplastic polyolefin elastomer or thermoplastic polyurethane elastomer.

4. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: The surface layer nonwoven fabric also has an open-pore structure.

5. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: The bottom nonwoven fabric also has an open-pore structure.

6. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: The spacing between adjacent strip-shaped recessed areas is 3 mm to 8 mm.

7. The breathable elastic composite nonwoven fabric according to claim 1, characterized in that: A single strip of raised or recessed areas may be continuous or discontinuous.

8. A method for manufacturing the breathable elastic composite nonwoven fabric according to any one of claims 1 to 7, wherein the specific steps are: (1) Elastic film opening process: A thermoplastic elastic resin is melted and extruded through a screw extruder to form an elastic cast film; the elastic cast film enters a vacuum opening device, which is composed of a vacuum pump, a forming drum connected to the vacuum pump, and a forming mesh cage located outside the forming drum. When the elastic film enters the vacuum suction port of the vacuum opening device, a plurality of funnel-shaped openings are formed on the surface due to the pressure difference between the inside and the outside, thereby forming an elastic film with funnel-shaped openings, wherein: The shape of the funnel-shaped opening is consistent with the shape of the hole on the forming mesh cage located outside the forming drum; (2) Elastic film transverse stretching process: After the elastic film with the funnel-shaped opening enters the transverse stretching device composed of multiple sets of clamps located on both sides of the elastic film, the two sides are clamped by the multiple sets of clamps, and the transverse width is gradually increased, and gradually stretched from the unstretched state to 200%-300% of the original transverse width; (3) Laminating step: the surface layer nonwoven fabric and the bottom layer nonwoven fabric enter the laminating device from the upper side and the lower side of the elastic film with funnel-shaped openings in the stretched state, respectively, and are laminated with the elastic film with funnel-shaped openings in the stretched state through hot pressing to form the elastic composite nonwoven fabric in the stretched state, wherein: the concave areas of the surface layer nonwoven fabric and the bottom layer nonwoven fabric are laminated on the top and bottom surfaces of the funnel-shaped openings of the intermediate layer elastic film, respectively, and the laminating positions correspond to each other up and down; (4) The shrinkage molding process loosens the multiple sets of clamps on both sides of the elastic composite non-woven fabric in a stretched state, so that the width of the elastic composite non-woven fabric shrinks to an unstretched state, forming an elastic composite non-woven fabric with multiple strip-like raised areas and recessed areas arranged laterally on the surface layer non-woven fabric and the bottom layer non-woven fabric, and a funnel-shaped opening on the middle layer elastic film, and then trims the edges and rolls up.

9. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 8, characterized in that: In the step (3), the composite device is composed of a pair of smooth rollers; the surface layer non-woven fabric and the bottom layer non-woven fabric are firstly sprayed with glue by a fixed-point glue spraying device respectively, and then enter the composite device, and are hot-pressed and composited with the elastic film with funnel-shaped openings in a stretched state at the hot-pressing position of the fixed-point glue spraying position to form the elastic composite non-woven fabric in a stretched state.

10. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 9, characterized in that: In the step (3), the distance between adjacent glue spraying ports in the fixed-point glue spraying device is 4 mm-30 mm.

11. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 9, characterized in that: In the step (3), the distance between adjacent glue spraying ports in the fixed-point glue spraying device is 6 mm-24 mm.

12. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 8, characterized in that: In the step (3), the composite device is composed of a pair of convex rollers and a smooth roller. The surface layer non-woven fabric and the bottom layer non-woven fabric enter the composite device respectively, and are composited with the elastic film with funnel-shaped openings in a stretched state at the convex roller hot pressing position to form the elastic composite non-woven fabric in a stretched state.

13. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 12, characterized in that: In the step (3), the convex roller of the composite device has a plurality of continuous or discontinuous annular protrusions distributed along the axial direction.

14. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 13, characterized in that: In the step (3), the distance between adjacent annular protrusions distributed along the axial direction on the convex roller of the composite device is 4 mm-30 mm.

15. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 13, characterized in that: In the step (3), the distance between the annular protrusions distributed along the axial direction on the convex roller of the composite device is 6mm-24mm.

16. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 13, characterized in that: The surface layer nonwoven fabric and the bottom layer nonwoven fabric are respectively sprayed with glue by a fixed-point glue spraying device before entering a composite device composed of a pair of convex rollers and a smooth roller.

17. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 16, characterized in that: The distance between adjacent glue spraying ports of the fixed-point glue spraying device is consistent with the distance between adjacent annular protrusions distributed along the axial direction on the convex roller.

18. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 8, characterized in that: In the step (3), the surface layer nonwoven fabric first enters a punching device consisting of a pair of needle rollers and a concave roller for a hole-making process before entering the compounding device.

19. The method for manufacturing a breathable elastic composite nonwoven fabric according to claim 8, characterized in that: In the step (3), the bottom nonwoven fabric first enters a punching device consisting of a pair of needle rollers and a concave roller for a hole-making process before entering the compounding device.

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