CN114411272B - Secondary fractal spiral electrostatic spinning head and tertiary fractal spiral electrostatic spinning head - Google Patents

Secondary fractal spiral electrostatic spinning head and tertiary fractal spiral electrostatic spinning head Download PDF

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CN114411272B
CN114411272B CN202210015130.7A CN202210015130A CN114411272B CN 114411272 B CN114411272 B CN 114411272B CN 202210015130 A CN202210015130 A CN 202210015130A CN 114411272 B CN114411272 B CN 114411272B
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fractal
spiral
electrostatic spinning
spinning head
radius
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CN114411272A (en
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刘延波
周聪
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Wuhan Textile University
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Wuhan Textile University
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

The invention discloses a secondary fractal spiral electrostatic spinning head and a tertiary fractal spiral electrostatic spinning head, wherein the secondary fractal spiral electrostatic spinning head is obtained by re-spiraling on the basis of a primary spiral electrostatic spinning head based on a fractional dimension (part is self-similar to the whole) theory, and the tertiary fractal spiral electrostatic spinning head is obtained by re-spiraling the secondary fractal spiral electrostatic spinning head; compared with the existing primary spiral electrostatic spinning head, the secondary fractal spiral electrostatic spinning head and the tertiary fractal spiral electrostatic spinning head provided by the invention have the characteristics of more spinning sites, thinner metal wires, higher field intensity, small spinning voltage, low energy consumption, high yield, thinner and more uniform fibers and safer spinning process.

Description

Secondary fractal spiral electrostatic spinning head and tertiary fractal spiral electrostatic spinning head
Technical Field
The invention belongs to the field of electrostatic spinning heads, and particularly relates to a secondary fractal spiral electrostatic spinning head and a tertiary fractal spiral electrostatic spinning head.
Background
Electrostatic spinning is a method for preparing nanofibers by drawing polymer solution or melt through electric field force generated by a high-voltage direct-current power supply, is one of the most effective technologies for preparing nanofibers at present, and has been widely researched in recent years. It has the advantages of low cost, simplicity, and capability of processing most polymers. The product fineness of the fiber is between nanometer and micron, and the fiber is deposited on a receiving device in a disordered state to form a non-woven fabric-like micro-nano fiber mesh film which can be used in a plurality of high-tech fields such as filter materials, biomedical materials, chemical sensors, battery diaphragms and the like.
At present, the large-scale electrostatic spinning technology is mainly divided into two types: one is a needleless electrospinning technique and the other is a multi-needle electrospinning technique. The roller type needle-free electrostatic spinning technology has the advantages that the needle blockage problem of needle type electrostatic spinning does not exist, the yield is high, but the problems of high required voltage, high energy consumption, air breakdown and the like are easily caused; the required voltage is lower, controllable liquid supply and fiber are thinner in the multi-needle electrostatic spinning process, but the problems of easy blockage of the needle, low yield, serious edge effect and the like exist. At present, the attractive large-scale needleless electrostatic spinning technology is spiral coil electrostatic spinning and spiral blade electrostatic spinning developed on the basis of the spiral coil electrostatic spinning; the former has a lower yield than the latter, but requires a lower voltage, the latter has a higher yield but requires a higher voltage, consumes a higher power and is liable to cause air breakdown.
Disclosure of Invention
In order to solve the technical problems, the invention provides a two/three-time fractal spiral structure electrostatic spinning head based on a fractal dimension theory.
In order to achieve the above object, one technical solution of the present invention is as follows: a secondary fractal spiral electrostatic spinning head is formed by winding a primary spiral on the basis of a spiral track, is used as a needle-free electrostatic spinning head, and is used for spinning upwards and carrying out liquid rotation.
Specifically, the metal wire radius R of the primary spiral electrostatic spinning head 0 Not exceeding 1mm.
Specifically, the secondary fractal spiral thread pitch H of the secondary fractal spiral electrostatic spinning head 1 Is composed of
20-120mm。
Specifically, the radius R of the secondary fractal spiral structure 2 Is 10-250mm.
Specifically, the radius R of the primary spiral of the secondary fractal spiral electrostatic spinning head 1 Is 2-20mm.
In particular, the primary spiral coil M of the secondary fractal spiral structure 1 Not less than 20 turns.
Preferably, R 1 >R 0 ；R 2 >R 1 +R 0 ；H 1 >2(R 0 +R 1 )/0.9；R 0 <0.9π(R 2 -R 1 )/M 1 。
The invention provides a three-time fractal spiral electrostatic spinning head based on a fractal dimension theory.
In order to achieve the above object, the technical solution provided by the present invention is as follows: the triple fractal spiral electrostatic spinning head is of a triple fractal spiral structure formed by spirally winding the double fractal spiral electrostatic spinning head.
Specifically, the number of secondary spiral winding turns M of the cubic fractal spiral structure 32 Not less than 20 turns.
Specifically, the radius R of the cubic fractal spiral structure 3 Is 20-500mm.
Specifically, the triple fractal spiral pitch H of the triple fractal spiral structure 2 Is 30-300mm.
Preferably, wherein R 1 >R 0 ；R 2 >R 1 +R 0 ；R 3 >R 1 +R 2 +R 0 ；H 2 >2(R 0 +R 2 +R 1 )/0.9；R 1 <0.9π(R 3 -R 2 )/M 32 ；R 0 <0.9π(R 2 -R 1 )/M 1 。
The invention has the beneficial effects that: the secondary fractal spiral electrostatic spinning head and the tertiary fractal spiral electrostatic spinning head provided by the invention have the characteristics of more spinning sites, small metal wire radius, small required voltage, small interference between field intensities, high yield, high field intensity, low energy consumption, uniform field intensity and uniform fiber fineness.
Drawings
FIG. 1 is a schematic view of a structure of a conventional one-time (fractal) spiral electrospinning head (left: front view; right: side view);
FIG. 2 is a schematic structural view of a second fractal spiral electrospinning head according to the present invention (left: front view; right: side view);
fig. 3 is a schematic diagram of the structure of a cubic fractal spiral electrospinning head proposed by the present invention (left: front view; right: side view).
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Wherein R is 0 Is the wire radius, R 1 Helical radius of a fractal spiral, H 0 The pitch of a fractal spiral, F 1 Fractal screw for representing one-step spiral electrostatic spinning headA wire;
H 1 the pitch of the quadric fractal spiral, R 2 The radius of the central axis of the secondary fractal spiral is; in the secondary fractal spiral, the pitches of the inner side and the outer side of the primary fractal spiral are not equal (H) 0-in <H 0-out ) So that the number of turns of the winding is used to define the pitch H of the fractal spiral 0 (ii) a For fixed length spinnerets, the number of turns defines the pitch of the inner and outer sides of the primary helix, F 2 Represents a quadratic fractal spiral;
H 2 the pitch of the cubic fractal spiral, R 3 Is the central axis radius of the cubic fractal spiral, M 2 Number of turns of winding of cubic fractal spiral, M 1 Number of turns of winding of quadratic fractal spiral, F 3 Representing a cubic fractal spiral.
Interpretation of terms
The term of the one-time fractal spiral structure (the structure of which is shown in fig. 1) is defined as follows:
pitch H of first fractal spiral 0 : means a radius R 0 When a mass point on the primary fractal spiral of the metal wire is coiled by 360 degrees from the point to another point along a spiral track, the linear distance between the two points is formed, the formed structure is called a primary fractal spiral structure unit, and the central axis of the corresponding primary fractal spiral is set as A 0 (see FIG. 1 for details);
central axis radius R of primary fractal spiral 1 : is the vertical distance from the central point of the circular section of the metal wire of the first fractal spiral to the central axis of the first fractal spiral. Because the diameter of the metal wire is 2R 0 The inner diameter and the outer diameter of the formed fractal spiral are different (the inner diameter is equal to 2R) 1 -2R 0 An outer diameter of 2R or more 1 +2R 0 ) The radius of the first-order fractal spiral is defined as R 1 。
The term of the quadric fractal spiral structure (the structure of which is shown in fig. 2) is defined as follows:
second order fractal spiral pitch H 1 : fractal central axis A 0 Along the quadric fractal central axis A 1 Helically wound, diameter R 0 Of a wire, from which a mass point on a fractal spiral is formedPoint along once fractal central axis A 0 When the fractal spiral is coiled and spirally coiled for 360 degrees along the central axis of the quadratic fractal spiral at the same time to reach another point, the formed structure is called a quadratic fractal spiral structure unit, the central axis of the corresponding quadratic fractal spiral is set as A 1 (description FIG. 2);
spiral winding number M of secondary fractal spiral 1 The number of the primary fractal spiral structural units contained in one secondary fractal spiral structural unit in the secondary fractal spiral is referred to;
central axis radius R of secondary fractal spiral 2 The distance between the central axis of the primary fractal spiral structure of the secondary fractal spiral structure and the central axis of the secondary fractal spiral structure is referred to;
central axis radius R of first fractal spiral 1 The definition is the same as that of the previous step;
first fractal spiral pitch H 0 As before.
The term of the cubic fractal spiral structure (the structure of which is shown in fig. 3) is defined as follows:
cubic fractal spiral pitch H 1 : fractal central axis A 0 Along the quadratic fractal central axis A 1 Spirally winding and secondarily forming a central axis A 1 Along the cubic fractal central axis A 2 Helically wound, diameter R 0 A mass point on the primary fractal spiral of the metal wire, from which point along the primary fractal central axis A 0 Coiled and simultaneously along the quadric fractal central axis A 1 The spiral is coiled for 360 degrees along the central axis of the cubic fractal line to reach the other point, the linear distance formed between the two points is called a structural unit of the cubic fractal line, and the central axis of the corresponding cubic fractal line is set as A 2 (instruction FIG. 3);
spiral winding number M of cubic fractal spiral 2 The number of the first fractal spiral structural units contained in one cubic fractal spiral structural unit in the cubic fractal spiral is referred to;
radius of cubic fractal spiral R 3 The vertical distance from the central axis of the cubic fractal spiral structure to the central axis of the secondary spiral is defined;
central axis radius R of secondary fractal spiral contained in cubic fractal spiral 2 Spiral winding number M of secondary fractal spiral 1 Pitch H of the quadric fractal spiral 1 Central axis radius R of once-fractal spiral 1 The definition is the same as the previous definition;
spiral winding number M of secondary fractal spiral 32 The number of secondary fractal spiral structure units contained in one tertiary fractal spiral structure unit in the tertiary fractal spiral is indicated;
example 1
As shown in fig. 2, the present embodiment provides a secondary fractal spiral electrostatic spinning head, which is a secondary fractal spiral structure formed by spirally winding a primary fractal spiral electrostatic spinning head, and is made of spring steel.
Wherein the radius of the quadric fractal spiral R 2 10mm, primary helix radius R 1 Is 2mm, and the number of secondary fractal spiral winding turns is M 1 40 turns, the pitch H of the secondary fractal spiral 1 20mm, wire R 0 The radius is 0.1mm.
Example 2
The difference from example 1 is that: second order fractal spiral radius R 2 40mm, primary helix radius R 1 Is 5mm, and the number of secondary fractal spiral winding turns is M 1 50 turns, the pitch H of the secondary fractal spiral 1 Is 50mm, wire R 0 The radius is 0.25mm.
Example 3
The difference from example 1 is that: second order fractal spiral radius R 2 250mm, primary helix radius R 1 20mm, and the number of secondary fractal spiral winding turns is M 1 60 turns, the pitch H of the secondary fractal spiral 1 120mm, wire R 0 The radius is 1mm.
Example 4
As shown in fig. 3, this embodiment provides a cubic fractal spiral electrospinning head, which is a cubic fractal spiral structure formed by spirally winding a quadratic fractal spiral electrospinning head, and is made of spring steel, wherein the radius R of the cubic fractal spiral is 3 20mm, second fractal spiral radius R 2 5mm, primary helix radius R 1 Is 2mm, and the number of secondary fractal spiral winding turns is M 32 20 turns, and one fractal spiral winding turns number M 1 30 turns, triple fractal spiral pitch H 2 30mm, wire R 0 The radius is 0.1mm.
Example 5
The difference from example 4 is that: radius of cubic fractal spiral R 3 Is 100mm, and the radius R of the second fractal spiral 2 16mm, primary spiral radius R 1 Is 4mm, and the number of secondary fractal spiral winding turns is M 32 30 turns, and M times of fractal spiral winding 1 60 turns, triple fractal spiral pitch H 2 150mm, wire R 0 The radius is 0.4mm.
Example 6
The difference from example 4 is that: radius of cubic fractal spiral R 3 Is 500mm, and the radius R of the second fractal spiral 2 Is 80mm, the radius of the primary spiral R 1 10mm, and M times of secondary fractal spiral winding 32 Is 40 turns, and the number of turns M of the three-time fractal spiral winding 1 300 turns, triple fractal spiral pitch H 2 300mm, wire R 0 The radius is 0.3mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. A secondary fractal spiral electrostatic spinning head is characterized in that a secondary fractal spiral structure is formed by spirally winding a primary spiral electrostatic spinning head; the radius R of the metal wire of the primary spiral electrostatic spinning head 0 Not more than 1mm; the pitch H of the secondary fractal spiral structure 1 Is 20-120mm; the central axis radius R of the secondary fractal spiral structure 2 10-250mm, the primary spiral radius R of the secondary fractal spiral structure 1 2-20mm;
one of the quadric fractal spiral structureNumber of times of fractal spiral winding M 1 Not less than 20 circles; wherein R is 1 >R 0 ；R 2 >R 1 +R 0 ；H 1 >2(R 0 +R 1 )/0.9；R 0 <0.9π(R 2 -R 1 )/M 1 。
2. A triple fractal spiral electrospinning head characterized by a triple fractal spiral structure spirally wound by the double fractal spiral electrospinning head of claim 1.
3. The cubic fractal spiral electrostatic spinning head as claimed in claim 2, wherein the pitch H of the cubic fractal spiral structure 2 30-300mm, the central axis radius R of the cubic fractal spiral structure 3 Is 20-500mm.
4. The cubic fractal spiral electrospinning head of claim 3, wherein the cubic fractal spiral structure has a secondary fractal spiral winding number M 32 Not less than 20 turns.
5. The triple fractal spiral electrospinning head of any one of claims 2 to 4, wherein R is 1 >R 0 ；R 2 >R 1 +R 0 ；R 3 >R 1 +R 2 +R 0 ；H 2 >2(R 0 +R 2 +R 1 )/0.9；R 1 <0.9π(R 3 -R 2 )/M 32 ；R 0 <0.9π(R 2 -R 1 )/M 1 。
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JP4800879B2 (en) * 2006-08-25 2011-10-26 日本バイリーン株式会社 Polymer solution supply member, electrospinning apparatus, and method for producing electrospun nonwoven fabric
WO2010043002A1 (en) * 2008-10-17 2010-04-22 Deakin University Electrostatic spinning assembly
US20140377391A1 (en) * 2013-06-25 2014-12-25 Paul Kaohing Lee Electro Fiber Pulling Apparatus with Spiral Rod
CN107620127A (en) * 2016-07-14 2018-01-23 天津工业大学 A kind of needle-less electrostatic spinning component based on fractal structure
CN209243249U (en) * 2018-12-04 2019-08-13 广东工业大学 A kind of needleless spinning equipment based on fractal principle
CN111286793A (en) * 2020-04-03 2020-06-16 浙江工业大学之江学院 Multi-spiral-line electrostatic spinning device
CN212451764U (en) * 2020-04-03 2021-02-02 浙江工业大学之江学院 Multi-spiral-line electrostatic spinning device

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