CN215713562U - Embedded type double-component composite fiber and composite spun-bonded non-woven fabric thereof - Google Patents

Abstract

The utility model discloses an embedded double-component composite fiber and a composite spun-bonded non-woven fabric thereof, which are characterized in that the composite fiber is integrally formed by a first fiber and a second fiber, the second fiber is embedded in the first fiber, the heat contractibility of the second fiber is greater than that of the first fiber, one fiber is embedded in the other fiber, the heat contractibility of the two fibers are different, wherein the fiber with high heat contractibility forms an arc shape under the action of Van der Waals force after being subjected to spinning forming and cooling by a spinneret plate, so that the whole fiber generates natural physical crimping, and the bulkiness and the softness of the composite fiber and a composite non-woven fabric material prepared by adopting the composite fiber are improved.

Description

Embedded type double-component composite fiber and composite spun-bonded non-woven fabric thereof

Technical Field

The utility model relates to a composite fiber, in particular to an embedded double-component composite fiber and a composite spun-bonded non-woven fabric thereof.

Background

With the development of economy and the improvement of living standard, people have more and more demands on sanitary products such as paper diapers, sanitary napkins, breast pads and the like. Meanwhile, the quality requirements of products are continuously improved, including the softness and the fuzz resistance of the products.

In order to improve the softness of sanitary products such as paper diapers, sanitary napkins and breast pads sold in the market at present, hot air non-woven fabrics are generally used as the surface layers of the products and the constituent materials of the leakage-proof structures. The hot-air non-woven fabric has good flexibility, but is formed by fusing short fibers through hot air, so that the phenomena of fuzzing and hair falling are inevitable. In addition, due to the limitation of the process, the gram weight of the hot air spinning cloth needs to be higher, and is generally more than 18 grams per square meter. Thus, there is a need for improvement in terms of reduction of environmental carbon emissions and energy saving.

In addition, the pant-type diaper and the pant-type sanitary napkin are generally designed with two layers of wrapping materials at the bottom to clamp the rubber band, so that the product forms an elastic waistline, an elastic leg circumference and the like. In the production process, the front and rear barrier cover materials are bonded to each other in the waist region by thermocompression bonding or ultrasonic bonding to form pants. The common spun-bonded material has high softening point and melting point, so that the consumed electric energy is high, and meanwhile, the high internal energy causes the flatness of a joint part to be poor and the joint part to be relatively hard and rough, so that the waist part is easy to rub to cause discomfort when in use.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides an embedded double-component composite fiber and a composite spun-bonded non-woven fabric thereof.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

an embedded bi-component composite fibre, characterised in that the composite fibre is integrally formed from a first fibre and a second fibre, the second fibre being embedded within the first fibre, the second fibre having a greater thermal shrinkage than the first fibre.

The first fibers are made of a polypropylene material, a polyester material or a mixed material of polypropylene and polyester material, and the second fibers are made of a modified polypropylene material, a polyethylene material or a mixed material of modified polypropylene and polyethylene.

The outer side of the first fiber is axially provided with an embedding opening, and the second fiber is embedded in the embedding opening.

The second fibers have a heat shrinkability that is greater than the heat shrinkability of the first fibers by 20% or more.

The first fiber volume is 1.8-2.2 times the second fiber volume.

The fineness of the first fibers is between 1.5 and 3 deniers, and the fineness of the second fibers is between 2 and 4 deniers.

The composite spun-bonded non-woven fabric is composed of three layers, wherein at least the first layer is made of the composite fibers, and the rest are made of common spun-bonded fibers.

The gram weight of the composite spun-bonded non-woven fabric is between 13 and 20 grams per square meter.

The utility model has the beneficial effects that: the utility model embeds one fiber into the other fiber, the two fibers have different heat shrinkage performances, wherein the fiber with high heat shrinkage is formed into an arc shape under the action of Van der Waals force after being subjected to spinning and forming by a spinneret plate and cooled, so that the whole fiber generates natural physical crimping, thereby improving the bulkiness and the softness of the composite fiber and the composite non-woven fabric material prepared by the composite fiber.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic cross-sectional view of a composite fiber;

FIG. 2 is an exploded schematic view of a composite fiber;

FIG. 3 is a schematic cross-sectional view of a composite spunbond nonwoven;

fig. 4 is a schematic cross-sectional view of a spinneret plate.

Reference numerals

1 first fiber

2 second fiber

3 inserting port

4 first nozzle

5 second nozzle hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The directional or positional relationships "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., are indicative of those directions or positional relationships based on the drawings and are intended to facilitate the description of the utility model and to simplify the description, but are not intended to indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Referring to fig. 1 to 4, an embedded bi-component composite fiber is characterized in that the composite fiber is integrally formed by a first fiber 1 and a second fiber 2, the second fiber 2 is embedded in the first fiber 1, the thermal shrinkage of the second fiber 2 is greater than that of the first fiber 1, one fiber is embedded in the other fiber, the thermal shrinkage of the two fibers is different, wherein the fiber with high thermal shrinkage is spun by a spinneret plate and is formed into an arc shape under the action of van der waals force after being cooled, so that the whole fiber generates natural physical crimping, and the bulkiness and softness of the composite fiber and a composite non-woven fabric material made of the composite fiber are improved.

The first fibers 1 are made of polypropylene materials, polyester materials or mixed materials formed by polypropylene and polyester materials, and the second fibers 2 are made of modified polypropylene materials, polyethylene materials or mixed materials formed by modified polypropylene and polyethylene; polypropylene, transparent and light in appearance, with a melting point of 189 ℃, softening at about 155 ℃ and a shrinkage rate of 1.0-2.5; the polyester can be divided into PET and PBT, the PET has a softening range of 230-240 ℃, a melting point of 255-260 ℃, a shrinkage rate of 1.2-2.0, good fiber forming property, and the PBT has excellent comprehensive performance, the melting point of 220-225 ℃, the shrinkage rate of 1.5-2.5, and compared with the PET, the PBT has high low-temperature crystallization speed and good molding property; the melting point of the polyethylene is 85-110 ℃, and the shrinkage rate is 1.5-3.0.

The molecular weight of the first fiber 1 is higher than that of the second fiber 2, the shrinkage of the second fiber 2 is larger than that of the first fiber 1, the softening point and the melting point of the second fiber 2 are both smaller than those of the first fiber, the fiber with high thermal shrinkage is subjected to spinning forming by a spinneret plate and is cooled to form an arc shape under the action of van der waals force, so that the whole fiber generates natural physical crimping, the bulkiness and the softness of the composite fiber are improved, the softening point and the melting point of the second fiber 2 are lower, the energy consumption generated by hot pressing or ultrasonic wave combination can be reduced, the application comfort of consumers is improved, and meanwhile, the energy conservation and emission reduction are realized, and the development concept of national green innovation is met.

The outer side of the first fiber 1 is provided with an embedding opening 3 in the axial direction, the second fiber 2 is embedded in the embedding opening 3, in the embodiment, the cross section of the composite fiber is circular, the cross section of the first fiber 1 is crescent moon-shaped, and the cross section of the second fiber 2 is left-right symmetrical lobe-shaped. The bulkiness and the softness of the material are improved.

The thermal shrinkage of the second fiber 2 is more than 20% larger than that of the first fiber 1, and the second fiber 2 has larger shrinkage than that of the first fiber 1 and shrinks when being spun, formed and cooled.

The first fibers 1 have a volume that is 1.8 to 2.2 times the volume of the second fibers 2.

The fineness of the first fibers 1 is between 1.5 and 3 deniers, and the fineness of the second fibers 2 is between 2 and 4 deniers.

The composite spunbonded non-woven fabric made of the composite fibers comprises three layers, wherein at least the first layer is made of the composite fibers, and the rest are made of common spunbonded fibers. The first layer can be composed of composite fibers, and the other two layers are composed of common spun-bonded fiber layers; or the composite fiber can be composed of a first layer and a second layer of composite fiber, and the third layer is composed of a common spun-bonded fiber layer; or three layers are all composed of composite fibers.

The gram weight of each square meter of the composite spun-bonded non-woven fabric is 13-20 g, the non-woven fabric is formed by spun-bonded processes such as splitting, lapping and reinforcing after fibers are formed, carding links are reduced unlike hot air non-woven fabrics, and therefore the gram weight can be reduced.

A method for manufacturing the composite fiber comprises the following steps,

the method comprises the following steps: respectively putting the raw material A and the raw material B into a drier for drying treatment;

step two: respectively putting the raw material A and the raw material B into a screw extruder for extrusion and melting;

step three: respectively conveying the melted raw material A and the melted raw material B to a melt filter to filter impurities;

step four: respectively conveying the raw material A and the raw material B into a metering pump for weighing and metering;

step five: and conveying the raw materials A and B to a distribution plate and converging the raw materials A and B into a spinneret plate for spinning to form a finished product.

The section of the jet hole of the spinneret plate in the fifth step is circular, the jet hole is composed of a first jet hole 4 and a second jet hole 5, the section of the first jet hole 4 is in a crescent moon shape, a notch is formed in the outer side of the first jet hole 4, and the second jet hole 5 is located in the notch.

The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.

Claims (8)

1. An embedded bi-component composite fibre, characterised in that the composite fibre is integrally formed from a first fibre (1) and a second fibre (2), the second fibre (2) being embedded within the first fibre (1), the second fibre (2) having a greater thermal shrinkage than the first fibre (1).

2. The embedded bi-component conjugate fiber according to claim 1, wherein the first fiber (1) is made of polypropylene, polyester or a mixture of polypropylene and polyester, and the second fiber (2) is made of modified polypropylene, polyethylene or a mixture of modified polypropylene and polyethylene.

3. The embedded bi-component composite fibre according to claim 1, characterized in that the outside of the first fibre (1) is provided axially with an embedding opening (3), the second fibre (2) being embedded within the embedding opening (3).

4. The embedded bicomponent composite fiber according to claim 1, characterized in that the heat shrinkability of the second fiber (2) is more than 20% greater than the heat shrinkability of the first fiber (1).

5. Embedded bi-component composite fibre according to claim 1, characterised in that the first fibre (1) volume is 1.8-2.2 times the volume of the second fibre (2).

6. Embedded bi-component composite fibre according to claim 1, characterised in that the fineness of the first fibres (1) is between 1.5-3 denier and the fineness of the second fibres (2) is between 2-4 denier.

7. A composite spunbond nonwoven fabric made from the composite fibers as claimed in any one of claims 1 to 6, characterized in that the composite spunbond nonwoven fabric is composed of three layers, wherein at least a first layer is made from the composite fibers and the remaining layers are made from ordinary spunbond fibers.

8. The composite spunbond nonwoven according to claim 7, characterized in that the grammage of the composite spunbond nonwoven is between 13 and 20 grams per square meter.

Images