CN213896227U

CN213896227U - High-efficient melt-blown non-woven fabrics

Info

Publication number: CN213896227U
Application number: CN202022178173.6U
Authority: CN
Inventors: 谷源明
Original assignee: DALIAN RUIGUANG NONWOVEN GROUP CO LTD
Current assignee: DALIAN RUIGUANG NONWOVEN GROUP CO LTD
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-08-06
Anticipated expiration: 2030-09-29

Abstract

The utility model belongs to the non-woven fabrics field discloses a high-efficient melt-blown non-woven fabrics. Comprises a melt-blown cloth layer A and a melt-blown cloth layer B; the melt-blown cloth layer A and the melt-blown cloth layer B are mutually entangled and connected; the melt-blown cloth layer A and the melt-blown cloth layer B are made of the same material, and a plurality of superfine fibers are crossed with each other and overlapped to form a compact network; wherein the fiber diameter of the superfine fiber is 1-5 microns; the superfine fibers with different fiber diameters are distributed in a gradient way. Not only can prevent dust, virus, bacteria droplet and the like from entering, but also keeps the breath from penetrating through the holes, thereby not only meeting the filtration efficiency, but also meeting the requirement of breath resistance. On the premise of meeting the efficiency resistance, the gram weight of the non-woven fabric is about 30-50% lower than that of the non-woven fabric in the same standard product in the market.

Description

High-efficient melt-blown non-woven fabrics

Technical Field

The utility model belongs to the non-woven fabrics field, the utility model relates to a high-efficient melt-blown non-woven fabrics.

Background

The melt-blown nonwoven fabric has the advantages of fine fibers, multiple pores and small pore size, and has outstanding filtering property, shielding property, heat insulation property, oil absorption property, water repellency and the like, so that the melt-blown nonwoven fabric is widely used in the fields of medical and sanitary materials, medical and industrial masks, heat-insulating materials, oil absorption materials, sound-insulating materials, gas filtering materials and the like, and plays an important role in many high-end application fields.

In the field of materials for air filtration, the melt-blown cloth has the characteristics of low initial resistance and high filtration efficiency (the filtration efficiency of 0.3um particle size can reach 99.9% under the flow state of 32L/min), and is widely applied to the fields of medical high-performance masks, air purification treatment and filtration devices and the like.

In the liquid filtering material, the melt-blown cloth can filter particles with the particle size of 0.22-10 pm. Such as bacteria, blood and macromolecular substances. The filter is mainly applied to the filtration of photosensitive resists in the electronic industry, the filtration of medicines, biological and synthetic plasma products in the pharmaceutical industry, the filtration of beverages, beer and syrup in the food industry, the fine filtration of electroplating liquid, the filtration of purified water in water plants, the purification and filtration of tap water, the filtration device for producing hydrogen by electrolyzing water, the filtration of environmental wastewater and the like.

Since the outbreak of pneumonia epidemic caused by novel coronavirus, the mask for preventing virus becomes a necessary article for people nationwide and even worldwide, and becomes a material shortage at one time. The mask can be divided into American standard N95/N99 series, European standard P1/P2/P3 series and the like according to the protection grade of the mask. The melt-blown cloth is the most core material of the mask, the quality of the melt-blown cloth is measured by two indexes of filtering efficiency and resistance, the high filtering efficiency can cause overlarge expiration resistance, and the low filtering efficiency can cause small expiration resistance. Obtaining high quality melt-blown nonwoven fabrics is a technical difficulty.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming not enough among the above-mentioned background art, providing a high-efficient melt-blown non-woven fabrics, both can prevent entering such as dust, virus and the little foam of bacterium, keep exhaling simultaneously and see through the hole, consequently both satisfied filtration efficiency, satisfied the requirement of expiration resistance simultaneously. On the premise of meeting the efficiency resistance, the gram weight of the non-woven fabric is about 30-50% lower than that of the non-woven fabric in the same standard product in the market.

The utility model provides a technical scheme that its technical problem adopted is: a high-efficiency melt-blown non-woven fabric comprises a melt-blown fabric layer A and a melt-blown fabric layer B; the melt-blown cloth layer A and the melt-blown cloth layer B are mutually entangled and connected; the melt-blown cloth layer A and the melt-blown cloth layer B are made of the same material, and a plurality of superfine fibers are crossed with each other and overlapped to form a compact network; wherein the fiber diameter of the superfine fiber is 1-5 microns; the superfine fibers with different fiber diameters are distributed in a gradient way.

The superfine fibers with different fiber diameters are distributed in a gradient way; the method is characterized in that the interior of the melt-blown non-woven fabric is divided into a plurality of space areas, in each space area, the superfine fiber percentage of 1-3 micron fiber diameter is 80-90%, the superfine fiber percentage of 3-4 micron fiber diameter is 10-15%, the superfine fiber percentage of 4-5 micron fiber diameter is 0-5%, and the superfine fibers of different fiber diameters are staggered and overlapped to form a three-dimensional space structure with high porosity and small porosity.

The gram weight of the high-efficiency melt-blown non-woven fabric is 20-50 g.

The preparation process of the high-efficiency melt-blown non-woven fabric comprises the following steps: and uniformly mixing the melt-blown PP material and the electret master batch according to a certain proportion, and conveying the mixture to a screw extruder, wherein the temperature of the extruder is set to be 220-270 ℃.

The fuse-element is extruded the back through the screw rod, through prefiltering and measurement system, gets into the spinning die head, and the fibre that comes out forms superfine fiber through hot-blast draft, and these superfine fibers can adsorb on the lapper net curtain, because the net curtain slope produces the angle, can produce in the twinkling of an eye piling up when superfine fiber adsorbs on the net curtain, form melting layer A and melt-blown layer B, and this two-layer melt-blown layer can compound in an organic whole by fibre self adhesive force, forms the melt-blown cloth of high-efficient low resistance. The temperature of the die head is set to be 250-280 ℃.

The mesh curtain conveys the melt-blown fabric into electrostatic electret equipment, charges generated by high-voltage discharge are bound on fibers and can be stored for a long time.

And (6) winding and slitting.

Compared with the prior art, the utility model beneficial effect who has is:

at present, many melt-blown non-woven fabric products in the market have high filtration efficiency and overlarge expiration resistance, and the low filtration efficiency and the small expiration resistance; in order to ensure two indexes of filtering efficiency and resistance at the same time, two layers of 25g melt-blown non-woven fabrics are overlapped to form 50g melt-blown non-woven fabrics serving as a product, and even a product with higher gram weight can meet the requirements of efficiency and resistance. The utility model provides a high-efficient melt-blown non-woven fabrics, fiber diameter become the gradient distribution, form the spatial structure that the porosity is high and the porosity size is little, make the electric charge tie on the fibre and can store the electric charge for a long time through the electret technique, both can prevent entering such as dust, virus and the little foam of bacterium, keep exhaling simultaneously and see through the hole. Compared with products with the same specification on the market, the gram weight is reduced by about 30-50%, and low gram weight, high efficiency and low resistance are really achieved.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic view of the structure of the high-efficiency melt-blown non-woven fabric of the present invention.

In the figure, 1 is a melt-blown cloth layer A, 2 is a melt-blown cloth layer B.

Detailed Description

The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.

Example 1

A high-efficiency melt-blown non-woven fabric is shown in figure 1 and comprises a melt-blown fabric layer A1 and a melt-blown fabric layer B2; the melt-blown cloth layer A1 and the melt-blown cloth layer B2 are mutually entangled and connected; the melt-blown cloth layer A1 and the melt-blown cloth layer B2 are made of the same material, and a plurality of superfine fibers are crossed with each other and overlapped to form a compact network; wherein the fiber diameter of the superfine fiber is 1-5 microns; the superfine fibers with different fiber diameters are distributed in a gradient way.

The gram weight of the high-efficiency melt-blown non-woven fabric is 30 g.

The preparation process of the high-efficiency melt-blown non-woven fabric comprises the following steps: the additive amount of the melt-blown PP material is 97%, the additive amount of the electret master batch is 3%, the mixture is uniformly mixed and then conveyed to a screw extruder, and the temperature of the extruder is set to be 220-270 ℃.

After the melt is extruded by a screw, the melt enters a spinning die head through a pre-filtering and metering system, and the discharged fiber is drawn by hot air to form superfine fiber. The die temperature is set to be 250-280, the draft wind pressure is set to be 1.0-1.5 bar, the DCD value is set to be 200-220mm

Superfine fiber adsorbs on the lapper net curtain, because the net curtain slope produces the angle, can produce in the twinkling of an eye when superfine fiber adsorbs on the net curtain piles up, forms melting layer A and melt-blown layer B, and these two-layer melt-blown layer can compound in an organic whole formation melt-blown cloth by fibre self adhesive force.

The melt-blown fabric enters electrostatic electret equipment, generates charges through high-voltage discharge to be bound on fibers and can be stored for a long time. The electrostatic emission current was 10 mA.

And (6) winding and slitting.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A high-efficiency melt-blown non-woven fabric is characterized by comprising a melt-blown fabric layer A (1) and a melt-blown fabric layer B (2); the melt-blown cloth layer A (1) and the melt-blown cloth layer B (2) are mutually entangled and connected; the melt-blown cloth layer A (1) and the melt-blown cloth layer B (2) are made of the same material, and a plurality of superfine fibers are crossed with each other and overlapped to form a compact network; wherein the fiber diameter of the superfine fiber is 1-5 microns; the superfine fibers with different fiber diameters are distributed in a gradient way.

2. The high efficiency melt blown nonwoven fabric according to claim 1, wherein the grammage of the high efficiency melt blown nonwoven fabric is 20 to 50 g.