Dry-wet melt spinning on-line material structure

Abstract

The utility model discloses a dry method and wet method melt spinning on-line material structure. The dry method and wet method melt spinning on-line material structure sequentially comprises a melt spinning supporting layer, a wet method absorbing layer and a dry method anti-falling layer from bottom to top. The polypropylene fiber web on the bottom layer and the synthetic fiber and regenerated fiber mixed spinning fiber web on the surface layer have oleophylic groups, and the cellulose fiber web on the middle layer has hydrophilic groups, so that the material has double characteristics of water absorption and oil absorption; the wet-process layer is wrapped by the upper layer and the lower layer, even if hardwood pulp is used, the situations of desquamation, hair slip and the like cannot occur, and the raw material cost can be reduced on the premise that the application performance of the wet-process layer in the field of medical treatment and public health is guaranteed. The wet process net is transferred to the melt spinning net on line, heat energy of the melt spinning net is effectively utilized, and energy conservation is facilitated. Meanwhile, the wet process net enables the fibers in the melt spinning net to form a fiber shape gradient due to the temperature gradient, that is, the fibers in contact with the wet process net become flat, the coverage area is increased, and the fibers close to the bottom curtain keep circular sections.

Description

Technical Field

[0001] The utility model belongs to the technical field of textile materials, and more specifically relates to a dry-wet melt-spinning online material structure. Background Art

[0002] Dry laying, wet laying and melt spinning are the three commonly used web-forming methods in the production of nonwoven materials. Each method is suitable for different fiber raw materials, forming processes, reinforcement forming and finishing processes, thus giving the material different application properties.

[0003] In order to meet the various requirements of the application field, offline compounding of dry-laid, wet-laid and melt-spun nonwoven materials is currently the conventional path. However, since each monomer has been initially formed before offline compounding, the organic fusion of the three fiber webs is restricted, affecting the design performance of the composite product. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to solve the deficiencies in the prior art and provide a dry-wet melt-spinning online material structure.

[0005] Technical solution: The dry-wet melt-spinning online material structure described in the utility model includes, from bottom to top, a melt-spinning support layer, a wet-process absorption layer and a dry-process anti-peeling layer.

[0006] In some embodiments, the surface density of the melt-spun support layer is 8 to 30 g / m 2 .

[0007] In some embodiments, the melt-spun support layer is formed by melt-extrusion of polypropylene masterbatch, and the fiber fineness is 20-200 μm.

[0008] In some embodiments, the surface density of the wet absorbent layer is 40-90 g / m 2 .

[0009] In some embodiments, the wet-laid absorbent layer is made from wood pulp fibers and ultra-short regenerated cellulose fibers.

[0010] In some embodiments, the wood pulp fiber is coniferous pulp or broadleaf pulp.

[0011] In some embodiments, the ultra-short regenerated cellulose fiber has a fineness of 0.5 to 3D and a length of 5 to 12 mm.

[0012] In some embodiments, the wood pulp fibers and ultra-short regenerated cellulose fibers are mixed into water in proportion, wherein the mass proportion of the wood pulp fibers in the mixed fibers is 50% to 100%; and the concentration of the mixed fibers in the mixed liquid is 2% to 4%.

[0013] In some embodiments, the dry anti-stripping layer density is 20-60 g / m 2 , using synthetic fibers or blending with regenerated cellulose fibers, the fiber fineness is 1~2.5D.

[0014] Beneficial effects: The beneficial effects of the utility model are as follows:

[0015] (1) The polypropylene fiber mesh at the bottom layer and the synthetic fiber main fiber mesh at the surface layer have lipophilic groups, while the cellulose fiber mesh at the middle layer has hydrophilic groups, so the material has both water and oil absorption properties;

[0016] (2) The wet-process layer is covered with two layers, and even if broadleaf pulp is used, there will be no desquamation or hair loss, which can ensure its application in the medical and health field;

[0017] (3) The wet web is transferred online to the melt-spun web, which effectively utilizes the heat energy of the melt-spun web and helps save energy. At the same time, the wet web will cause the fibers in the melt-spun web to form a fiber shape gradient due to the temperature gradient, that is, the fibers contacting the wet web become flat, increasing the coverage area, while the fibers close to the bottom curtain maintain a circular cross-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the material structure of an embodiment of the present utility model.

[0019] Figure 2 This is an electron microscope image of a cross-section of a composite material according to an embodiment of the present invention, mainly showing the anti-stripping layer and the absorption layer.

[0020] Figure 3 This is an electron microscope image of a cross-section of a composite material according to an embodiment of the present invention, mainly showing the absorption layer and the melt-spun layer. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are the directions or positional relationships shown, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] The present invention will be further described in detail below through specific implementation examples and in conjunction with the accompanying drawings. Example

[0025] like Figure 1 As shown, a dry-wet melt-spun online material structure includes, from bottom to top, a melt-spun support layer 3, a wet-spun absorption layer 2 and a dry-spun anti-stripping layer 1.

[0026] In this embodiment, the surface density of the melt-spun support layer 3 is 8-30 g / m 2 The melt-spun support layer 3 is formed by melt-extrusion of polypropylene masterbatch, with a fiber fineness of 20-200 μm. The melt-spun support layer provides geometric support and mechanical properties for the composite material, while also providing anti-shaving properties.

[0027] In this embodiment, the surface density of the wet absorbent layer 2 is 40-90 g / m 2 The wet-laid absorbent layer 2 is made of wood pulp fibers and ultra-short regenerated cellulose fibers. The wet-laid absorbent layer 2 is transferred to the melt-spun support layer after being wet-laid and initially dehydrated and shaped by the heat energy of the melt-spun web.

[0028] Furthermore, the wood pulp fiber is coniferous pulp or broadleaf pulp; the ultra-short regenerated cellulose fiber has a fineness of 0.5~3D and a length of 5~12mm.

[0029] Further preferably, the wood pulp fibers and the ultra-short regenerated cellulose fibers are mixed into water in proportion, wherein the mass proportion of the wood pulp fibers in the mixed fibers is 50% to 100%; and the concentration of the mixed fibers in the mixed liquid is 2% to 4%.

[0030] In this embodiment, the surface density of the dry anti-stripping layer 1 is 20-60 g / m 2 , using synthetic fibers or blending with regenerated cellulose fibers, the fiber fineness is 1~2.5D. Example

[0031] A process for preparing a dry-wet melt-spinning online material structure, comprising:

[0032] (1) The process steps for forming the melt-spinning support layer include polymer melting, extrusion, spinning, web formation, and bonding. The polymer can be polypropylene masterbatch, or biodegradable polyester, PLA, etc. The specific screw temperature zone control is directly determined by the properties of the polymer masterbatch, the extrusion and spinning parameters are determined by the product's preset fiber fineness range, and the web formation receiving parameters and bonding conditions are determined by the product design range.

[0033] (2) The process steps for forming the wet absorption layer include raw material preparation, beating, mixing, wet web forming, web transfer, etc. The ultra-short regenerated cellulose fibers in the raw materials can be viscose, Tencel, bamboo fiber, etc. The wood pulp fiber is preferably coniferous pulp, and the lower-cost broadleaf pulp can also be used. However, when using broadleaf pulp, the proportion of ultra-short regenerated cellulose fibers should be appropriately increased and the beating time should be reduced. The beating time of the wood pulp should be controlled within 8 to 12 minutes. After being mixed with the ultra-short regenerated cellulose fibers in proportion, it should be fully stirred in the pulp mixing drum for more than 30 minutes. Through the isobaric tank and the pulping pump, the slurry is input into the inclined screen former according to the process requirements to form a wet paper sheet of designed grammage, which is transferred to the melt-spinning support layer fiber web with the help of the forming net and the transfer net water spun head.

[0034] (3) The dry-process anti-stripping layer formation process includes fiber blending, opening and mixing, and combing into a web. The fiber raw materials are synthetic fibers or mixed with regenerated cellulose fibers, with a fiber fineness of 1-2.5D and a length of 30-60mm. The proportion of oleophilic synthetic fibers is 30%-100%. In order to ensure the anti-stripping property, the fiber web is subjected to a random effect during combing, so that the fibers are distributed in a two-dimensional random manner. The obtained fiber web is directly laid on the wet-process absorbent layer.

[0035] (4) The melt-spun support layer, wet absorption layer, and dry anti-peeling layer are simultaneously fed into the reinforcement area by the mesh curtain and reinforced into a composite body by three groups of water spunlace upper punctures and three groups of water spunlace lower punctures arranged alternately. The first group of reinforcement needs to use flat mesh water spunlace, and the next two groups can use either flat mesh water spunlace or rotary mesh water spunlace. The needle plate water needle aperture is 0.08~0.12mm, and the water spunlace pressure is 5~80kg. The reinforcement adopts this incremental configuration to avoid fiber displacement and loss. After reinforcement, the material is first dehydrated by the negative pressure roller and then enters the direct-fired drying system for drying. The drying temperature is 100~130℃, and the moisture content of the wound product is 3~12%.

[0036] The polypropylene fiber mesh at the bottom layer and the synthetic fiber main fiber mesh at the surface layer of the material structure of the utility model have oleophilic groups, while the cellulose fiber mesh at the middle layer has hydrophilic groups, so the material has both water and oil absorption properties.

[0037] The wet layer is covered by two layers, upper and lower. Even if broadleaf pulp is used, there will be no desquamation or hair loss, which can ensure its application in the medical and health field.

[0038] The wet-laid web is transferred online to the melt-spun web, effectively utilizing the heat energy of the melt-spun web and helping to save energy. At the same time, the wet-laid web causes the fibers in the melt-spun web to form a fiber shape gradient due to the temperature gradient. That is, the fibers contacting the wet-laid web become flat, increasing the coverage area, while the fibers close to the bottom curtain maintain a round cross-section.

[0039] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A dry-wet melt-spinning online material structure, characterized by: From bottom to top, it includes a melt-spun support layer (3), a wet-process absorption layer (2) and a dry-process anti-stripping layer (1).

2. The dry-wet melt-spinning online material structure according to claim 1, characterized in that: The surface density of the melt-spun support layer (3) is 8-30 g / m 2 .

3. The dry-wet melt-spinning online material structure according to claim 2, characterized in that: The melt-spinning support layer (3) is formed by melt-extrusion of polypropylene masterbatch, and the fiber fineness is 20-200 μm.

4. The dry-wet melt-spinning online material structure according to claim 1, characterized in that: The surface density of the wet absorption layer (2) is 40-90 g / m 2 .

5. The dry-wet melt-spinning online material structure according to claim 1, characterized in that: The surface density of the dry anti-stripping layer (1) is 20-60 g / m 2 , using synthetic fiber, fiber fineness is 1~2.5D.

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