Biodegradable composite nonwoven fabrics and wet wipes containing them

Abstract

This invention provides a biodegradable composite nonwoven fabric and a wet wipe containing the same, relating to the field of nonwoven fabric technology. The biodegradable composite nonwoven fabric comprises a first fiber web layer, a first mixed cellulose fiber layer, and a second fiber web layer sequentially laminated together. The first mixed cellulose fiber layer is mainly prepared by direct-lay hydroentangling of a first mixed pulp made from wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers. This invention effectively improves the water absorption and retention properties of the biodegradable composite nonwoven fabric through the inclusion of the first mixed cellulose fiber layer. Furthermore, the arrangement of the first and second fiber web layers on both sides of the first mixed cellulose fiber layer effectively avoids lint shedding and improves the tensile strength of the biodegradable composite nonwoven fabric.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric technology, and in particular to a biodegradable composite nonwoven fabric and a wet wipe containing the same. Background Technology

[0002] Wet wipes are divided into personal wipes and object wipes. Object wipes are mainly used for cleaning and disinfection. However, both personal and object wipes currently have certain problems, as follows:

[0003] First, when the moisture content exceeds four times the dry weight of the substrate, liquid will drip even without forceful squeezing. This results in a poor user experience and increases the defect rate during production because the substrate's poor water retention after adding liquid leads to the packaging becoming soaked. Second, when producing high-count wipes such as 60, 80, or 120 wipes, the substrate's water retention is limited. With increased production time, the moisture content of the first ten wipes under normal conditions (e.g., 60 wipes) is 3.29 times lower than that of the last ten wipes. For functional wipes relying on medicated solutions, the effectiveness of the first ten wipes is significantly reduced. Existing solutions address the poor absorbency and water retention by incorporating wood pulp fibers during the spunlace process to improve absorbency. However, the addition of wood pulp fibers often leads to lint shedding.

[0004] At the same time, the existing market has increasingly higher requirements for the various indicators of spunlace nonwoven fabrics used as carriers for wet wipes, especially the longitudinal and transverse strength of wet wipes. In order to achieve high tensile breaking strength, a smaller longitudinal and transverse breaking strength difference ratio, and smaller stretching displacement, manufacturers have abandoned direct-lay spunlace fabrics and adopted semi-cross spunlace fabrics with higher energy consumption and more complex equipment, which has led to the high cost of wet wipes.

[0005] Therefore, it is both necessary and urgent to research and develop a biodegradable composite nonwoven fabric with high water absorption and retention, low lint shedding, high tensile strength, and suitable for direct-lay hydroentangling process to meet market demands.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] The purpose of this invention is to provide a biodegradable composite nonwoven fabric, which has better water absorption and water retention properties, and can also effectively alleviate the problems of lint shedding and low tensile strength of existing biodegradable composite nonwoven fabrics.

[0008] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0009] This utility model provides a biodegradable composite nonwoven fabric, which includes a first fiber web layer, a first mixed cellulose fiber layer and a second fiber web layer sequentially laminated together.

[0010] The first mixed cellulose fiber layer is prepared by direct-lay hydroentangling of a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers.

[0011] The thickness of the first fiber web layer is 0.1mm-0.3mm;

[0012] The thickness of the first mixed cellulose fiber layer is 0.5 mm to 0.8 mm;

[0013] The thickness of the second fiber web layer is 0.1mm-0.3mm.

[0014] Furthermore, the second fiber web layer can be replaced with a second mixed cellulose fiber layer.

[0015] Furthermore, the biodegradable composite nonwoven fabric comprises a first fiber web layer, a first mixed cellulose fiber layer, and a second mixed cellulose fiber layer sequentially laminated together.

[0016] The thickness of the first fiber web layer is 0.1mm-0.3mm;

[0017] The thickness of the first mixed cellulose fiber layer is 0.5 mm to 0.8 mm;

[0018] The thickness of the second mixed cellulose fiber layer is 0.3mm-0.5mm.

[0019] Furthermore, a viscose fiber skeleton layer is provided between the first mixed cellulose fiber layer and the second mixed cellulose fiber layer.

[0020] The thickness of the viscose fiber skeleton layer is 0.05mm~0.2mm.

[0021] Furthermore, the viscose fibers in the viscose fiber skeleton layer are filaments formed by twisting 20-60mm viscose fiber long fibers.

[0022] Furthermore, a viscose fiber skeleton layer is provided between the first mixed cellulose fiber layer and the second fiber web layer.

[0023] Furthermore, the biodegradable composite nonwoven fabric comprises a first fiber web layer, a first mixed cellulose fiber layer, a viscose fiber skeleton layer, and a second fiber web layer sequentially laminated together.

[0024] The thickness of the first fiber web layer is 0.1mm-0.3mm;

[0025] The thickness of the first mixed cellulose fiber layer is 0.5 mm to 0.8 mm;

[0026] The thickness of the viscose fiber skeleton layer is 0.05mm~0.2mm.

[0027] The thickness of the second fiber web layer is 0.1mm-0.3mm.

[0028] The present invention provides a wet wipe, wherein the wet wipe comprises the above-mentioned biodegradable composite nonwoven fabric.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] This invention provides a biodegradable composite nonwoven fabric, comprising a first fiber web layer, a first mixed cellulose fiber layer, and a second fiber web layer sequentially laminated together. The first mixed cellulose fiber layer is primarily prepared by a direct-lay hydroentangling process from a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers. The wood pulp short fibers account for 70-90% of the fiber content in the first mixed pulp, and the weight of the first mixed cellulose fiber layer is 50-80% of the weight of the biodegradable composite nonwoven fabric. This invention effectively improves the water absorption and retention properties of the biodegradable composite nonwoven fabric by incorporating the first mixed cellulose fiber layer. Furthermore, the combination of the first and second fiber web layers on both sides of the first mixed cellulose fiber layer effectively avoids lint shedding and improves tensile strength.

[0031] Furthermore, the second web layer of this application can be replaced with a second mixed cellulose fiber layer. The proportion of biodegradable viscose fiber and / or lyocell short fiber in the second mixed cellulose fiber layer is 40-100%. By increasing the proportion of viscose fiber and / or lyocell short fiber in the second mixed cellulose fiber layer, this application can effectively improve the moisture absorption speed and water retention performance of the entire web compared to the first mixed cellulose fiber layer. Simultaneously, a viscose fiber skeleton layer can also be provided between the first mixed cellulose fiber layer and the second web layer of the biodegradable composite nonwoven fabric of this application to increase longitudinal and transverse strength and make the overall stretch displacement of the nonwoven fabric more uniform; similarly, the viscose fiber skeleton layer can also be provided between the first mixed cellulose fiber layer and the second mixed cellulose fiber layer. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a production process flow diagram of the first fiber web layer 1 or the second fiber web layer 3 provided in Embodiment 1 of this utility model;

[0034] Figure 2 A production process flow diagram of the first mixed cellulose fiber layer 2 provided in Embodiment 1 of this utility model;

[0035] Figure 3 This is a flow chart of the production process of the biodegradable composite nonwoven fabric provided in Embodiment 1 of this utility model;

[0036] Figure 4 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 1 of this utility model;

[0037] Figure 5 A flowchart illustrating the manufacturing process of the viscose fiber skeleton layer 4 provided in Embodiment 2 of this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 2 of this utility model;

[0039] Figure 7 A production process flow diagram of the second mixed cellulose fiber layer 5 provided in Embodiment 3 of this utility model;

[0040] Figure 8 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 3 of this utility model;

[0041] Figure 9 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 4 of this utility model.

[0042] Icons: 1-First fiber web layer; 2-First mixed cellulose fiber layer; 3-Second fiber web layer; 4-Viscose fiber skeleton layer; 5-Second mixed cellulose fiber layer. Detailed Implementation

[0043] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] According to one aspect of the present invention, a biodegradable composite nonwoven fabric is provided, the biodegradable composite nonwoven fabric comprising a first fiber web layer 1, a first mixed cellulose fiber layer 2, and a second fiber web layer 3 sequentially laminated together.

[0045] The first mixed cellulose fiber layer 2 is mainly prepared by direct-lay hydroentangling of a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers.

[0046] The short wood pulp fibers account for 70-90% of the fiber content in the first mixed pulp.

[0047] The weight of the first mixed cellulose fiber layer 2 is 50-80% of the weight of the biodegradable composite nonwoven fabric.

[0048] This invention provides a biodegradable composite nonwoven fabric, comprising a first fiber web layer 1, a first mixed cellulose fiber layer 2, and a second fiber web layer 3 sequentially laminated together. The first mixed cellulose fiber layer 2 is mainly prepared from a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers via a direct-lay hydroentangling process. The wood pulp short fibers account for 70-90% of the fiber content in the first mixed pulp. Furthermore, the weight of the first mixed cellulose fiber layer 2 is 50-80% of the weight of the biodegradable composite nonwoven fabric. This means that at least 50% of the weight of the cellulose layer in the biodegradable composite nonwoven fabric provides good water-locking performance, while the lower limit of 20% of the weight of the upper and lower two / three layers provides constraint on the mixed cellulose layer for the entire composite nonwoven fabric.

[0049] Therefore, the present invention effectively improves the water absorption and water retention performance of the biodegradable composite nonwoven fabric by setting the first mixed cellulose fiber layer 2. At the same time, the arrangement of the first fiber web layer 1 and the second fiber web layer 3 on both sides of the first mixed cellulose fiber layer 2 can also effectively avoid the problem of lint shedding and improve the tensile breaking strength. In addition, the biodegradable composite nonwoven fabric of this application can be prepared by direct laying hydroentangling, which has the technical advantages of simple process and low processing cost.

[0050] In a preferred embodiment of this utility model, the wood pulp short fiber is hardwood pulp short fiber.

[0051] As a preferred embodiment, the hardwood pulp short fiber has a cost advantage over softwood pulp fiber, and the wood tissue structure is also denser than that of softwood pulp. The composite nonwoven fabric material produced by it has better absorption performance, water retention performance and fluffy thickness.

[0052] Preferably, the proportion of short hardwood pulp fibers in the mixed pulp is 80-90%.

[0053] In a preferred embodiment of the present invention, the first fiber web layer 1 is a hot-air nonwoven fiber web composed of biodegradable viscose fiber and polylactic acid fiber; the second fiber web layer 3 is a hot-air nonwoven fiber web composed of biodegradable viscose fiber and polylactic acid fiber.

[0054] In a preferred embodiment, the first fiber web layer 1 and the second fiber web layer 3 of this application are both hot-air nonwoven fiber webs composed of biodegradable viscose fiber and polylactic acid fiber, which have excellent soft hand feel and good water absorption speed. At the same time, the first fiber web layer 1 and the second fiber web layer 3 serve as the covering and bearing layer of the first mixed cellulose fiber layer 2, which can effectively prevent the wood pulp fiber layer from shedding, and eliminate customer complaints caused by fiber shedding when wiping with wet wipes. In addition, the first fiber web layer 1 and the second fiber web layer 3, as hot-air nonwoven fiber webs, also have good abrasion resistance.

[0055] It should be noted that the first fiber web layer 1 and the second fiber web layer 3 of this application are hot-air nonwoven fiber webs composed of biodegradable viscose fiber and polylactic acid fiber. If necessary, a small amount of low-melting-point fiber may also be added. The fiber ratio is: 60%-80% polylactic acid fiber, 20-40% viscose fiber, and 0%-10% low-melting-point fiber.

[0056] In a preferred embodiment of this invention, the basis weight of the first fiber web layer 1 is 14~50 g / m². 2 ;

[0057] In a preferred embodiment of this invention, the basis weight of the second fiber web layer 3 is 14~50 g / m². 2 .

[0058] In a preferred embodiment of this utility model, the second fiber web layer 3 can be replaced by the second mixed cellulose fiber layer 5;

[0059] The second mixed cellulose fiber layer 5 is mainly made of a second mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers, which is then sequentially processed by wet web forming and hydroentanglement reinforcement.

[0060] In a preferred embodiment of the present invention, the biodegradable viscose fiber and / or lyocell short fiber account for 40-100% of the fiber content in the second mixed pulp.

[0061] In a preferred embodiment, the second mixed cellulose fiber layer 5, by increasing the proportion of viscose fiber and / or lyocell short fiber in the second mixed cellulose fiber layer 5, improves the moisture absorption speed and water retention performance of the entire fiber web compared to the first mixed cellulose fiber layer 2.

[0062] In a preferred embodiment of the present invention, a viscose fiber skeleton layer 4 is further provided between the first mixed cellulose fiber layer 2 and the second fiber web layer 3.

[0063] The preparation method of the viscose fiber skeleton layer 4 includes: twisting 20-60mm viscose fiber long fibers into long filaments, and then weaving the long filaments into a mesh structure to obtain the viscose fiber skeleton layer 4.

[0064] In a preferred embodiment, the viscose fiber skeleton layer 4 is a composite nonwoven fabric. Before twisting, the viscose filaments are pretreated by a surface treatment using a mixed solution containing 0.5-1.5% antistatic agent and 1.0-2.0% softener. The treatment temperature is controlled at 40℃±2℃, and the treatment time is 10-15 minutes. This reduces filament breakage caused by static electricity and fiber stiffness during twisting and weaving, makes the surface of the viscose filaments smoother, facilitates subsequent processing operations, and improves its flexibility. The woven viscose fiber skeleton layer 4 is then heat-set at 100℃±5℃ for 5-10 minutes using hot air circulation or infrared heating. This eliminates the internal stress generated in the yarn during weaving and improves dimensional stability. The viscose fiber skeleton layer 4 increases the longitudinal and transverse strength of the composite nonwoven fabric, reduces elongation at break, and facilitates moisture transport along the yarn axis, forming certain moisture-wicking channels.

[0065] According to one aspect of the present invention, a method for preparing a biodegradable composite nonwoven fabric, the method comprising:

[0066] The first fiber web layer 1, the first mixed cellulose fiber layer 2, and the second fiber web layer 3 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0067] Alternatively, the first fiber web layer 1, the first mixed cellulose fiber layer 2, the viscose fiber skeleton layer 4, and the second fiber web layer 3 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0068] Alternatively, the first fiber web layer 1, the first mixed cellulose fiber layer 2, and the second mixed cellulose fiber layer 5 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0069] Alternatively, the first fiber web layer 1, the first mixed cellulose fiber layer 2, the viscose fiber skeleton layer 4, and the second mixed cellulose fiber layer 5 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0070] In a preferred embodiment of this utility model, the hot-press bonding conditions shall at least satisfy at least one of the following: hot-press bonding temperature is 110~140℃, pressure is 0.3~0.6 MPa, and time is 1~5s.

[0071] According to one aspect of the present invention, a biodegradable composite nonwoven fabric is used in the preparation of biodegradable wet wipes.

[0072] The biodegradable composite nonwoven fabric provided by this invention can be widely used in the preparation process of biodegradable wet wipes.

[0073] The technical solution of this utility model will be further described below with reference to the embodiments.

[0074] Example 1

[0075] Figure 1 A production process flow diagram of the first fiber web layer 1 or the second fiber web layer 3 provided in Embodiment 1 of this utility model.

[0076] Figure 2 A production process flow diagram of the first mixed cellulose fiber layer 2 provided in Embodiment 1 of this utility model.

[0077] Figure 3 The production process flow chart of the biodegradable composite nonwoven fabric provided in Embodiment 1 of this utility model.

[0078] Figure 4 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 1 of this utility model.

[0079] like Figure 4 As shown, this embodiment provides a biodegradable composite nonwoven fabric, which includes a first fiber web layer 1, a first mixed cellulose fiber layer 2, and a second fiber web layer 3 sequentially laminated together.

[0080] The first mixed cellulose fiber layer 2 is mainly prepared by direct-lay hydroentangling of a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers.

[0081] The first mixed cellulose fiber layer 2 only undergoes a pre-hydroentanglement process, with low pressure for initial entanglement, stabilizing the fiber web and achieving the purpose of initial fiber entanglement. After carding, the mixed fiber web is laid directly in the pre-entanglement zone. Hydroentanglement parameters include pressure of 0.5-1.5 MPa, needle diameter of 0.1-0.2 mm (small needle diameter ensures dense water flow), and needle spacing of 0.5-0.6 mm to guarantee uniform fiber web entanglement. The number of hydroentanglement heads is 1-3.

[0082] The fiber composition of the first mixed pulp is: 70%-90% hardwood pulp short fiber and 10-30% biodegradable viscose fiber.

[0083] The biodegradable composite nonwoven fabric of this embodiment includes a first fiber web layer 1, a first mixed cellulose fiber layer 2, and a second fiber web layer 3 sequentially laminated together. The first mixed cellulose fiber layer 2 effectively improves the water absorption and water retention performance of the biodegradable composite nonwoven fabric of this invention. At the same time, the arrangement of the first fiber web layer 1 and the second fiber web layer 3 on both sides of the first mixed cellulose fiber layer 2 can also effectively avoid the problem of lint shedding and improve the tensile breaking strength.

[0084] In the optional technical solution of this embodiment, the first fiber web layer 1 and the second fiber web layer 3 are hot-air nonwoven fiber webs composed of biodegradable viscose fiber and polylactic acid fiber. The hot-air nonwoven fiber web has excellent softness and good water absorption speed, while effectively preventing the wood pulp fiber layer from shedding lint, eliminating customer complaints caused by fiber shedding when wiping with wet wipes; in addition, the first fiber web layer 1 and the second fiber web layer 3, as hot-air nonwoven fiber webs, also have good abrasion resistance.

[0085] In this embodiment, the first fiber web layer 1 and the second fiber web layer 3 are hot-air nonwoven fiber webs composed of biodegradable viscose fiber and polylactic acid fiber. The fiber ratio is: 70% polylactic acid fiber, 20% viscose fiber, and 10% low melting point fiber.

[0086] In the optional technical solution of this embodiment, the basis weight of the first fiber web layer 1 is 30 g / m². 2 The basis weight of the second fiber web layer 3 is 30 g / m². 2 .

[0087] The method for preparing the biodegradable composite nonwoven fabric in this embodiment includes:

[0088] The first fiber web layer 1, the first mixed cellulose fiber layer 2, and the second fiber web layer 3 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0089] The hot-press bonding temperature is 120℃, the pressure is 0.5 MPa, and the time is 3s.

[0090] The thickness of the first fiber web layer 1 is 0.2 mm.

[0091] The thickness of the first mixed cellulose fiber layer 2 is 0.6 mm.

[0092] The thickness of the second fiber web layer 3 is 0.2 mm.

[0093] Example 2

[0094] Except for the viscose fiber skeleton layer 4 provided between the first mixed cellulose fiber layer 2 and the second fiber web layer 3, this embodiment is the same as embodiment 1.

[0095] The preparation method of the viscose fiber skeleton layer 4 includes: twisting 20-60mm viscose fiber long fibers into long filaments, and then weaving the long filaments into a mesh structure to obtain the viscose fiber skeleton layer 4.

[0096] Figure 5 The production process flow chart of the viscose fiber skeleton layer 4 provided in Embodiment 2 of this utility model.

[0097] Figure 6 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 2 of this utility model.

[0098] The method for preparing the biodegradable composite nonwoven fabric in this embodiment includes:

[0099] The first fiber web layer 1, the first mixed cellulose fiber layer 2, the viscose fiber skeleton layer 4, and the second fiber web layer 3 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0100] The hot pressing process parameters are the same as in Example 1.

[0101] The thickness of the first fiber web layer 1 is 0.2 mm.

[0102] The thickness of the first mixed cellulose fiber layer 2 is 0.5 mm.

[0103] The thickness of the viscose fiber skeleton layer 4 is 0.1 mm.

[0104] The thickness of the second fiber web layer 3 is 0.2 mm.

[0105] Example 3

[0106] This embodiment is the same as embodiment 1, except that the second fiber web layer 3 is replaced with the second mixed cellulose fiber layer 5.

[0107] The second mixed cellulose fiber layer 5 is a spunlace fabric prepared by a semi-crosslinking method from broadleaf wood pulp short fibers and biodegradable viscose fibers. The fiber composition of the second mixed cellulose fiber layer 5 is as follows:

[0108] Hardwood pulp short fibers and biodegradable viscose fibers are mixed at a ratio of 60:40 and fed into a web-laying machine using a semi-cross-laying process. The fibers are arranged longitudinally in the main web-laying direction, while the cross-laying device lays some fibers at an angle of 30°~60°, interweaving the longitudinal and transverse fibers to enhance the anisotropy of the web. The web weight is controlled at 25-50 g / m², and the thickness is 0.2-0.5 mm. Subsequent steps only involve a pre-hydroentangling reinforcement stage. In the pre-entangling zone, the hydroentangling head pressure is 2-5 MPa, the needle diameter is 0.1-0.2 mm, the needle spacing is 0.5-1.0 mm, and the distance between the hydroentangling head and the web is 5-10 mm, allowing for initial fiber entanglement at a lower pressure.

[0109] Figure 7 The production process flow diagram of the second mixed cellulose fiber layer 5 provided in Embodiment 3 of this utility model.

[0110] Figure 8 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 3 of this utility model.

[0111] The method for preparing the biodegradable composite nonwoven fabric in this embodiment includes:

[0112] The first fiber web layer 1, the first mixed cellulose fiber layer 2, and the second mixed cellulose fiber layer 5 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0113] The hot pressing process parameters are the same as in Example 1.

[0114] The thickness of the first fiber web layer 1 is 0.2 mm.

[0115] The thickness of the first mixed cellulose fiber layer 2 is 0.8 mm.

[0116] The thickness of the second mixed cellulose fiber layer 5 is 0.2 mm.

[0117] Example 4

[0118] This embodiment is the same as embodiment 3, except that a viscose fiber skeleton layer 4 is provided between the first mixed cellulose fiber layer 2 and the second mixed cellulose fiber layer 5.

[0119] The preparation method of the viscose fiber skeleton layer 4 is the same as in Example 2.

[0120] Figure 9 This is a schematic diagram of the structure of the biodegradable composite nonwoven fabric provided in Embodiment 4 of this utility model.

[0121] The method for preparing the biodegradable composite nonwoven fabric in this embodiment includes:

[0122] The first fiber web layer 1, the first mixed cellulose fiber layer 2, the viscose fiber skeleton layer 4, and the second mixed cellulose fiber layer 5 are sequentially composited and then hot-pressed together to obtain a biodegradable composite nonwoven fabric.

[0123] The hot pressing process parameters are the same as in Example 1.

[0124] The thickness of the first fiber web layer 1 is 0.2 mm.

[0125] The thickness of the first mixed cellulose fiber layer 2 is 0.6 mm.

[0126] The thickness of the viscose fiber skeleton layer 4 is 0.1 mm.

[0127] The thickness of the second mixed cellulose fiber layer 5 is 0.2 mm.

[0128] Experimental Example 1

[0129] To demonstrate the technical effects of the biodegradable composite nonwoven fabric of this application, the performance of the biodegradable composite nonwoven fabrics prepared in Examples 1 to 4 above was tested.

[0130] (I) The specific groupings are as follows:

[0131] Group 1: The biodegradable composite nonwoven fabric (first fiber web layer 1, first mixed cellulose fiber layer 2, and second fiber web layer 3) prepared in Example 1.

[0132] Group 2: The biodegradable composite nonwoven fabric prepared in Example 2 (first fiber web layer 1, first mixed cellulose fiber layer 2, viscose fiber skeleton layer 4, and second fiber web layer 3);

[0133] Group 3: The biodegradable composite nonwoven fabric (first fiber web layer 1, first mixed cellulose fiber layer 2, and second mixed cellulose fiber layer 5) prepared in Example 3.

[0134] Group 4: The biodegradable composite nonwoven fabric prepared in Example 4 (first fiber web layer 1, first mixed cellulose fiber layer 2, viscose fiber skeleton layer 4, and second mixed cellulose fiber layer 5);

[0135] Group 5: Meltblown-wood pulp-meltblown twin-spun composite nonwoven fabric.

[0136] The specific preparation process for Group 5 is as follows:

[0137] 1. Raw material preparation

[0138] Meltblown fiber raw material: biodegradable polypropylene (PP). Wood pulp raw material: virgin wood pulp fiber with a length of 1-3mm.

[0139] 2. Fiber preparation:

[0140] Meltblown fiber preparation: After drying, polymer chips are fed into a twin-screw extruder and melt-extruded at 200℃-300℃, forming ultrafine fibers through a meltblown nozzle. Pulp fiber opening and carding: The pulp fibers pass through a pulp opening mechanism and enter a carding machine under the action of a conveying fan. The carding machine typically rotates at 3000-3200 rpm, carding the pulp fibers into a uniform fiber web.

[0141] 3. Mixing and forming the web: The meltblown head sprays polymer fibers toward the mixing zone, and the wood pulp fibers are sprayed into the mixing zone through the discharge nozzle on the carding machine. The two fibers meet and mix in the mixing zone. The polymer fibers located on both sides of the meltblown head that do not enter the mixing zone form the bottom layer and the top layer, respectively. The mixed fibers fall onto the web forming mechanism to form the middle layer. The web forming mechanism carries the composite fiber web and its movement speed is generally 40-100m / min.

[0142] 4. Thermal bonding:

[0143] Thermal bonding method: The meltblown fibers and wood pulp fibers in the composite fiber web are bonded together by hot rolling or hot air bonding to form a stable nonwoven fabric structure.

[0144] Hot bonding parameters: When hot rolling bonding, the temperature of the hot rolling roll is generally 100℃-150℃ and the pressure is 5-20kN / m; when hot air bonding, the hot air temperature is 80℃-120℃ and the air speed is 0.5-2m / s.

[0145] 5. Winding and slitting: The bonded nonwoven fabric is wound into a roll and then slitted according to different uses to obtain products of the required specifications.

[0146] Group 6: 4r / 6t spunlace fabric.

[0147] Group 7: 2r / 8t spunlace fabric.

[0148] The weight of each of the above groups of fabrics is controlled at 80±5g.

[0149] (II) Performance testing items include:

[0150] a-Average of five qualified data points for wet longitudinal tensile strength;

[0151] b - Average of five qualified data points for wet longitudinal fracture elongation displacement;

[0152] c - Average of five qualified data for wet transverse fracture strength;

[0153] d - Average of five qualified data points for wet transverse fracture elongation displacement;

[0154] e-simulated wet wipes (80 wipes) placed for one month with 3.5 times the dry cloth weight of liquid added - the difference between the lowest and highest liquid content among the 80 wipes:

[0155] (III) The test results are as follows:

[0156]

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biodegradable composite nonwoven fabric, characterized in that, The biodegradable composite nonwoven fabric comprises a first fiber web layer (1), a first mixed cellulose fiber layer (2), and a second fiber web layer (3) sequentially laminated together. The first mixed cellulose fiber layer (2) is prepared by direct-lay hydroentangling of a first mixed pulp made of wood pulp short fibers and biodegradable viscose fibers and / or lyocell short fibers; The thickness of the first fiber web layer (1) is 0.1mm-0.3mm; The thickness of the first mixed cellulose fiber layer (2) is 0.5 mm to 0.8 mm; The thickness of the second fiber web layer (3) is 0.1mm-0.3mm.

2. The biodegradable composite nonwoven fabric according to claim 1, characterized in that, The second fiber web layer (3) can be replaced by the second mixed cellulose fiber layer (5).

3. The biodegradable composite nonwoven fabric according to claim 2, characterized in that, The biodegradable composite nonwoven fabric comprises a first fiber web layer (1), a first mixed cellulose fiber layer (2), and a second mixed cellulose fiber layer (5) sequentially laminated together. The thickness of the first fiber web layer (1) is 0.1mm-0.3mm; The thickness of the first mixed cellulose fiber layer (2) is 0.5 mm to 0.8 mm; The thickness of the second mixed cellulose fiber layer (5) is 0.3 mm to 0.5 mm.

4. The biodegradable composite nonwoven fabric according to claim 3, characterized in that, A viscose fiber skeleton layer (4) is also provided between the first mixed cellulose fiber layer (2) and the second mixed cellulose fiber layer (5). The thickness of the viscose fiber skeleton layer (4) is 0.05mm~0.2mm.

5. The biodegradable composite nonwoven fabric according to claim 4, characterized in that, The viscose fiber in the viscose fiber skeleton layer (4) is a filament made by twisting 20-60mm viscose fiber long fibers.

6. The biodegradable composite nonwoven fabric according to claim 1, characterized in that, A viscose fiber skeleton layer (4) is also provided between the first mixed cellulose fiber layer (2) and the second fiber web layer (3).

7. The biodegradable composite nonwoven fabric according to claim 6, characterized in that, The biodegradable composite nonwoven fabric comprises a first fiber web layer (1), a first mixed cellulose fiber layer (2), a viscose fiber skeleton layer (4), and a second fiber web layer (3) sequentially laminated together. The thickness of the first fiber web layer (1) is 0.1mm-0.3mm; The thickness of the first mixed cellulose fiber layer (2) is 0.5 mm to 0.8 mm; The thickness of the viscose fiber skeleton layer (4) is 0.05mm~0.2mm; The thickness of the second fiber web layer (3) is 0.1mm-0.3mm.

8. A wet wipe, characterized in that, The wet wipes include the biodegradable composite nonwoven fabric as described in any one of claims 1 to 7.

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