CN110965377A - Fiber rope capable of improving bending rigidity and method for improving bending rigidity of fiber rope - Google Patents
Fiber rope capable of improving bending rigidity and method for improving bending rigidity of fiber rope Download PDFInfo
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- CN110965377A CN110965377A CN201911360733.5A CN201911360733A CN110965377A CN 110965377 A CN110965377 A CN 110965377A CN 201911360733 A CN201911360733 A CN 201911360733A CN 110965377 A CN110965377 A CN 110965377A
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- 239000000835 fiber Substances 0.000 title claims abstract description 392
- 238000005452 bending Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 189
- 238000009941 weaving Methods 0.000 claims abstract description 112
- 238000002844 melting Methods 0.000 claims abstract description 47
- 230000008018 melting Effects 0.000 claims abstract description 41
- 230000004927 fusion Effects 0.000 claims abstract description 16
- 239000004952 Polyamide Substances 0.000 claims description 34
- 229920002647 polyamide Polymers 0.000 claims description 34
- 239000002131 composite material Substances 0.000 claims description 26
- 229920000728 polyester Polymers 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 description 19
- 239000002994 raw material Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000009940 knitting Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
- D07B1/04—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics with a core of fibres or filaments arranged parallel to the centre line
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/007—Making ropes or cables from special materials or of particular form comprising postformed and thereby radially plastically deformed elements
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/10—Rope or cable structures
- D07B2201/1096—Rope or cable structures braided
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2009—Wires or filaments characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2055—Cores characterised by their structure comprising filaments or fibers
- D07B2201/2057—Cores characterised by their structure comprising filaments or fibers resulting in a twisted structure
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2066—Cores characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2075—Fillers
- D07B2201/2082—Fillers characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/209—Jackets or coverings comprising braided structures
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2092—Jackets or coverings characterised by the materials used
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2039—Polyesters
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2046—Polyamides, e.g. nylons
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Abstract
The embodiment of the application discloses a fiber rope capable of improving bending rigidity and a method for improving the bending rigidity of the fiber rope. The fiber rope is rope core, center and rope skin three-layer complex structure, wherein: the rope core is formed by weaving first chemical fibers, the middle core is arranged outside the rope core and is formed by weaving mixed fibers, and the rope sheath is arranged outside the middle core and is formed by weaving second chemical fibers; the mixed fiber comprises a first chemical fiber and/or a second chemical fiber and at least one third chemical fiber, the melting point of the third chemical fiber is lower than that of the first chemical fiber and the second chemical fiber, and the mass content of the third chemical fiber is 5-60%; the interface of the rope core and the middle core is in contact with each other to form a reticular structure with a plurality of fusion bonding points which are mutually connected, the interface of the middle core and the rope sheath is in contact with each other to form a reticular structure with a plurality of fusion bonding points which are mutually connected, and the obtained fiber rope has an integrated integral structure.
Description
Technical Field
The application belongs to the technical field of composite woven fiber ropes, and particularly relates to a fiber rope capable of improving bending rigidity and a method for improving the bending rigidity of the fiber rope.
Background
The bending stiffness of the rope is an important use performance of the rope, and different requirements on the bending stiffness of the rope are determined by different application fields of the rope.
For the composite woven fiber rope, the rope core part plays a main load bearing role in the using process, and the rope sheath mainly plays a role in protecting the rope core. The composite braided rope is commonly used in the fields of dragging ropes, tree art ropes, aerial work ropes, training ropes and the like, the bending rigidity requirements of customers on the rope are different according to the different application fields of the rope, and the bending rigidity of the composite braided fiber rope obtained by the existing rope manufacturing process is basically kept constant, so that the use requirements in different use fields are difficult to meet.
Disclosure of Invention
In order to solve at least one of the above-mentioned technical problems in the prior art, in one aspect, an embodiment of the present application discloses a fiber rope capable of improving bending stiffness, the fiber rope is a three-layer composite braided structure including a rope core, a middle core and a rope sheath, wherein:
the rope core is formed by weaving first chemical fibers;
the central core is arranged outside the rope core and is formed by weaving mixed fibers;
the rope sheath is arranged outside the central core and is formed by weaving second chemical fibers;
the mixed fiber comprises a first chemical fiber and/or a second chemical fiber and at least one third chemical fiber, wherein the melting point of the third chemical fiber is lower than that of the first chemical fiber and the second chemical fiber, and the mass content of the third chemical fiber in the mixed fiber is 5-60%;
the third chemical fiber and the first chemical fiber are mutually bonded through the fusion bonding points, a reticular structure with a plurality of bonding points which are mutually connected is formed on the interface where the rope core is contacted with the central core, the third chemical fiber and the second chemical fiber are mutually bonded through the fusion bonding points, a reticular structure with a plurality of fusion bonding points which are mutually connected is formed on the interface where the central core is contacted with the rope sheath, and the obtained fiber rope has an integrated integral structure.
Some embodiments disclose a fiber rope for increasing bending stiffness, wherein the first chemical fiber comprises one or a combination of polyester fiber and polyamide fiber.
Some embodiments disclose a fiber rope capable of improving bending stiffness, the core structure of the rope is one of 12 weaves, 16 weaves, plain 32 weaves, plain 48 weaves, twill 32 weaves or twill 48 weaves, wherein the number of the first chemical fibers is 5-50, the specification of the first chemical fibers is 840D, the twist of the first chemical fibers is set to be 30-120 twists/meter, and the weaving pitch is set to be 50-100 mm.
Some embodiments disclose a fiber rope for increasing bending stiffness, wherein the second chemical fiber comprises one or a combination of polyester fiber and polyamide fiber.
Some embodiments disclose a fiber rope capable of improving bending stiffness, the structure of the rope jacket is one of 12 weaves, 16 weaves, plain 32 weaves, plain 48 weaves, twill 32 weaves or twill 48 weaves, wherein the number of the second chemical fibers is 6-55, the specification of the second chemical fibers is 840D, the twist of the second chemical fibers is set to be 30-100 twists/meter, and the weaving pitch is set to be 25-80 mm.
Some embodiments disclose a fiber rope for increasing bending stiffness, the third chemical fiber comprising one or a combination of two of low melting point polyester fiber or low melting point polyamide fiber.
Some embodiments disclose a fiber rope capable of improving bending rigidity, wherein the structure of the central core is one of 8-braid, 12-braid or 16-braid, the twist of the mixed fiber is set to be 30-60 twist/m, and the braiding pitch is set to be 70-100 mm.
Some embodiments disclose a fiber rope capable of improving bending stiffness, the third chemical fiber has a size of 30-200D, the third chemical fiber has a breaking strength of not less than 3.5g/D, and the melting point of the third chemical fiber is 90-130 ℃.
In another aspect, some embodiments of the present application disclose a method for increasing bending stiffness of a fiber rope, the method comprising:
the fiber rope comprises a rope core woven by first chemical fibers and a rope sheath woven by second chemical fibers;
adding at least one layer of mixed fiber layer between the rope core and the rope sheath, wherein the mixed fiber layer comprises first chemical fibers and/or second chemical fibers and at least one third chemical fiber with a melting point lower than that of the first chemical fibers and the second chemical fibers;
and melting the third chemical fiber to form melting bonding points with the first chemical fiber and the second chemical fiber respectively to form a three-dimensional net structure formed by bonding the rope core and the central core and the rope sheath and the central core through the melting points in multiple points.
Further, some embodiments disclose a method for increasing the bending stiffness of a fiber rope, in which a third chemical fiber and the first chemical fiber and/or the second chemical fiber are bonded to each other by a melt bonding point in the mixed fiber layer.
The fiber rope capable of improving bending rigidity disclosed by the embodiment of the application comprises a mixed fiber layer, low-melting-point chemical fibers in the mixed fiber layer can be melted by heat treatment at the temperature higher than the melting point of the low-melting-point chemical fibers, other fibers in the mixed fibers and the low-melting-point chemical fibers are bonded together, the bonding between the fibers is realized by bonding a plurality of bonding points, and partial three-dimensional net structures are respectively formed between the mixed fiber layer and the rope core and the rope sheath adjacent to the mixed fiber layer on two sides of the mixed fiber layer, so that a three-layer composite weaving structure fiber rope with an integrated whole net structure is formed, the bending rigidity of the fiber rope can be effectively improved, the bending rigidity of the fiber rope is improved along with the improvement of the content of the low-melting-point fibers in the fiber rope, and the bending rigidity of the fiber rope can be improved by adjusting.
Drawings
FIG. 1 schematic representation of a fiber rope structure with improved bending stiffness as disclosed in example 1
FIG. 2 schematic cross-section of a fiber rope with increased bending stiffness as disclosed in example 1
Detailed Description
The word "embodiment" as used herein, is not necessarily to be construed as preferred or advantageous over other embodiments, including any embodiment illustrated as "exemplary". Performance index tests in the examples of this application, unless otherwise indicated, were performed using routine experimentation in the art. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; other test methods and techniques not specifically mentioned in the present application are those commonly employed by those of ordinary skill in the art.
The terms "substantially" and "about" are used throughout this disclosure to describe small fluctuations. For example, they may mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Concentrations, amounts, and other numerical data may be expressed or presented herein in a range format. Such range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values, such as 2%, 3.5%, and 4%, and sub-ranges, such as 1% to 3%, 2% to 4%, and 3% to 5%, etc. This principle applies equally to ranges reciting only one numerical value. Moreover, such an interpretation applies regardless of the breadth of the range or the characteristics being described.
In this disclosure, including the claims, all conjunctions such as "comprising," including, "" carrying, "" having, "" containing, "" involving, "" containing, "and the like are to be understood as being open-ended, i.e., to mean" including but not limited to. Only the conjunctions "consisting of … …" and "consisting of … …" are closed conjunctions.
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In the examples, some methods, means, instruments, apparatuses, etc. known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application. On the premise of no conflict, the technical features disclosed in the embodiments of the present application may be combined arbitrarily, and the obtained technical solution belongs to the content disclosed in the embodiments of the present application. The first and second mentioned in this application are only for describing different parts and do not indicate their sequential order. The mixed fiber mentioned in the present application generally refers to a combined fiber bundle of two or more chemical fibers including a low-melting-point chemical fiber. The bending stiffness referred to in this disclosure generally refers to the ability of a material or structure to resist bending elastic deformation when subjected to a force, and is indicative of the ease with which the material or structure can be elastically deformed. The bending stiffness of a material can generally be measured in terms of the bending modulus of elasticity, which is the proportionality coefficient of the part load proportional to the bending displacement, i.e., the force required to cause a unit bending displacement, in the macroscopic elastic range. The fusion bonding point referred to in the present disclosure generally refers to a bonding point formed by fusing a low-melting-point chemical fiber with other fibers and cooling the fused portion.
In some embodiments, a fiber rope capable of improving bending rigidity comprises a rope core, a middle core and a rope sheath three-layer composite structure, wherein: the rope core is formed by weaving first chemical fibers, the middle core is arranged outside the rope core and is formed by weaving mixed fibers, and the rope sheath is arranged outside the middle core and is formed by weaving second chemical fibers; the mixed fiber comprises first chemical fibers and/or second chemical fibers and at least one third chemical fiber, the melting point of the third chemical fiber is lower than that of the first chemical fiber and also lower than that of the second chemical fiber, and the mass content of the third chemical fiber in the mixed fiber is 5-60%; the third chemical fiber and the first chemical fiber are mutually bonded through the fusion bonding points, a reticular structure with a plurality of bonding points which are mutually connected is formed on the interface where the rope core is contacted with the central core, the third chemical fiber and the second chemical fiber are mutually bonded through the fusion bonding points, a reticular structure with a plurality of fusion bonding points which are mutually connected is formed on the interface where the central core is contacted with the rope sheath, and the obtained fiber rope has an integrated integral structure.
Usually, the central core part of the fiber rope is braided by mixed fibers, which can also be referred to as a mixed fiber layer, the mixed fibers are usually composed of a plurality of first chemical fibers and/or second chemical fibers and a plurality of third chemical fibers with melting point lower than that of the first chemical fibers and the second chemical fibers, different types of fibers in the mixed fibers are distributed at intervals, different types of fibers in the mixed fibers are uniformly distributed at intervals in the process of doubling or twisting to form fiber strands, if the mixed fibers are subjected to heat treatment, the heat treatment is carried out at the temperature higher than the melting point of the third chemical fibers and lower than that of the first chemical fibers and/or the second chemical fibers, the third chemical fibers are molten, the first chemical fibers and the second chemical fibers are not molten, and the low-melting third chemical fibers are fused with the first chemical fibers and/or the second chemical fibers, the fusion part forms a fusion bonding point after being cooled, the fusion bonding point after being cooled is generally distributed randomly, discontinuously and irregularly, a central core in the fiber rope is arranged between the rope core and the rope sheath, low-melting-point fibers in the mixed fiber layer form bonding points with the rope core part and the rope sheath part respectively, and the connection points are randomly and discretely distributed between the central core and the rope core and between the central core and the rope sheath; the three-dimensional net-shaped structure formed among the rope core, the middle core and the rope sheath enables the fiber rope to be fuller, the three forms an integrated structure, and the hand feeling and the overall performance of the fiber rope are effectively improved.
Usually, in the mixed fiber layer, the third chemical fiber and the first chemical fiber and/or the second chemical fiber composing the mixed fiber layer form a melting bonding point, and a plurality of spaced, discrete and randomly distributed melting bonding points enable the chemical fibers to be connected with each other to form a three-dimensional net structure, so that the bending rigidity of the fiber rope is increased.
As an alternative embodiment, the first chemical fiber of the fiber rope that can improve the bending stiffness includes one or a combination of two of polyester fiber and polyamide fiber. For example, the first chemical fiber may be a single polyester fiber or a single polyamide fiber, or a combination of a polyester fiber and a polyamide fiber in different proportions.
As an optional embodiment, the rope core of the fiber rope capable of improving the bending rigidity is a weaving structure formed by weaving first chemical fibers, and the weaving structure comprises one of 12 weaves, 16 weaves, plain 32 weaves, plain 48 weaves, twill 32 weaves or twill 48 weaves, wherein the number of the first chemical fibers is 5-50, the specification is 840D, and the twisting degree in the process of weaving the first chemical fibers into the rope core is set to be 30-120 twists/meter.
As an alternative embodiment, the second chemical fiber of the fiber rope that can improve the bending stiffness comprises one or a combination of two of polyester fiber and polyamide fiber. For example, the second chemical fiber may be a single polyester fiber or a polyamide fiber, or a combination of a polyester fiber and a polyamide fiber in different proportions.
According to an optional embodiment, the fiber rope capable of improving bending stiffness is formed by weaving second chemical fibers, the weaving structure of the rope skin is one of 12-weaving, 16-weaving, plain 32-weaving, plain 48-weaving, twill 32-weaving or twill 48-weaving, the number of the second chemical fibers is 6-55, the specification of the second chemical fibers is 840D, and the twisting degree in the process of weaving the second chemical fibers into the rope skin is set to be 30-100 twists/meter.
As an alternative embodiment, the third chemical fiber of the fiber rope that can improve the bending stiffness comprises one or a combination of two of the low melting point polyester fiber or the low melting point polyamide fiber. For example, the third chemical fiber may be a single low-melting polyester fiber, or a low-melting polyamide fiber, or a combination of a low-melting polyester fiber and a low-melting polyamide fiber at a certain ratio.
As an alternative embodiment, the melting point of the third chemical fiber in the fiber rope capable of improving the bending stiffness is 90-130 ℃.
As an alternative embodiment, the third chemical fiber in the fiber rope capable of improving the bending rigidity has the specification of 30-200D, and the breaking strength of the third chemical fiber is not less than 3.5 g/D.
In some embodiments, a method of increasing the bending stiffness of a fiber rope comprises:
selecting a fiber rope, wherein the fiber rope comprises a rope core formed by weaving first chemical fibers and a rope sheath formed by weaving second chemical fibers;
adding at least one layer of mixed fiber layer between the rope core and the rope sheath, wherein the mixed fiber layer comprises first chemical fibers and/or second chemical fibers and at least one third chemical fiber with a melting point lower than that of the first chemical fibers and the second chemical fibers;
and melting the third chemical fiber to form melting bonding points with the first chemical fiber and the second chemical fiber respectively to form a three-dimensional net structure formed by bonding the rope core and the central core and the rope sheath and the central core through the melting points in multiple points. Adding a layer of mixed fibers in the fiber rope, wherein the layer of mixed fibers comprises first chemical fibers and/or second chemical fibers and at least one third chemical fiber with a low melting point lower than that of the chemical fibers;
the chemical fibers with low melting points are bonded with each other to form a three-dimensional net structure formed by bonding a plurality of chemical fibers and the chemical fibers with low melting points through multiple points.
The low-melting-point chemical fiber and the other chemical fiber are generally bonded to each other by melting the low-melting-point chemical fiber, and for example, the fiber rope may be heated to a certain temperature and heat-treated, so that the low-melting-point third chemical fiber may be melted, the melted third chemical fiber and the first chemical fiber may be melted and bonded to each other, the melted third chemical fiber and the second chemical fiber may be melted and bonded to each other after cooling, and the melted bonding point may be formed after cooling. The heat treatment is usually performed at a temperature higher than the melting temperature of the low-melting third chemical fiber and lower than the melting temperatures of the first chemical fiber and the second chemical fiber in the fiber rope, so that only part of the fibers are melted during the heat treatment, and the main body of the fiber rope can be maintained without melting the main body of the fiber rope. As a heating method of the chemical fiber, for example, an electric heating method or an ultrasonic heating method may be used to heat the low-melting-point chemical fiber to a molten state in a high-temperature environment.
Further, some embodiments disclose the method for increasing the bending stiffness of a fiber rope, wherein the third chemical fiber and the first chemical fiber and/or the second chemical fiber are bonded to each other by a melt bonding point in the mixed fiber layer of the fiber rope.
In some embodiments, a fiber rope for increasing bending stiffness is made by a method comprising:
selecting a first chemical fiber filament and weaving a rope core; for example, polyamide fiber or polyester fiber filaments of 5 × 840D to 50 × 840D can be used as first chemical fibers to weave a rope core, the twist degree is set to be 30 to 120 twists/meter, the half number of twist directions is S twist direction, the half number of twist directions is Z twist direction, the weaving mode is one of 12 weaving, 16 weaving, plain 32 weaving, plain 48 weaving, twill 32 weaving and twill 48 weaving, and the weaving pitch is set to be 50 to 100 mm;
selecting mixed fiber filaments and weaving the central core; for example, 3 x 840D-6 x 840D polyamide fiber filaments and 30-1890D low-melting-point polyamide fiber filaments can be selected, or 3 x 840D-6 x 840D polyester fiber filaments and 50-2000D low-melting-point polyester fiber filaments can be selected as mixed fibers, the mass percentage of the low-melting-point fibers in the mixed fibers is set to be between 5% and 60%, and the twist of the mixed fibers for weaving the central core is set to be 30-60 twists/m; the twisting direction is half of S twisting direction and half of Z twisting direction, the weaving mode is one of 8-weaving, 12-weaving and 16-weaving structures, and the weaving pitch is set to be 70-100 mm; usually, the mixed fiber and the obtained rope core are fed into a knitting machine together for knitting to obtain a rope core/middle core two-layer composite knitting structure with a middle core knitted outside the rope core;
selecting second chemical fibers and weaving a rope skin; usually, a polyamide chemical fiber filament with the same material as the rope core can be selected as the second chemical fiber braided rope sheath, and a chemical fiber filament with a different material from the rope core can also be selected as the second chemical fiber braided rope sheath; the twist of the common weaving is set to be 30-100 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is one of 12 weaving, 16 weaving, plain 32 weaving, plain 48 weaving, twill 32 weaving and twill 48 weaving, the pitch is set to be 25-80 mm, the rope core/middle core composite weaving structure and the second chemical fiber are fed into a weaving machine together for weaving, and the rope core/middle core/rope sheath three-layer composite weaving structure with the rope sheath woven outside the middle core is obtained;
and (3) heating and setting, namely performing heat treatment on the obtained rope core/middle core/rope skin three-layer composite structure, for example, heating by using a hot oven or hot air blowing equipment, setting the temperature to be 110-160 ℃, setting the setting time to be 3-30 min, and then cooling and setting the rope at room temperature to obtain the fiber rope capable of improving the bending rigidity. The bending stiffness test method of the fiber rope refers to patent CN201320370028 and a bending stiffness test device for the rope, the diameter of a measuring head is 20mm, and the weight of a telescopic cylinder is 10N. The bending stiffness of the fiber rope with the relative bending stiffness value of 0.01-0.07 is high, the bending stiffness of the fiber rope with the relative bending stiffness value of 0.07-0.1 is medium, and the bending stiffness of the fiber rope with the relative bending stiffness value larger than 0.1 is low.
The technical details are further illustrated in the following examples.
Example 1
The fiber rope capable of improving bending rigidity disclosed in example 1 is prepared by the following steps:
weaving a rope core by using 10-in-840D polyamide filaments as a first chemical fiber raw material, wherein the twist number is set to be 60 twists/m; the twisting direction is half S direction and half Z direction, the weaving mode is 16 weaving rope cores, and the weaving pitch is 50 mm;
taking 4-in-840D polyamide filaments and 7-in-50D low-melting-point polyamide filaments as mixed fiber raw materials to weave a central core, wherein the melting point of the low-melting-point polyamide filaments is 98 ℃, the mass content of low-melting-point fibers is 10%, and the twist number is set to be 30 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is 8 weaving structure, the weaving pitch is set to be 100mm, the obtained rope core is fed into a weaving machine to be woven together, and the rope core/middle core double-layer composite weaving structure is formed;
weaving a rope sheath by using 11 pieces of 840D polyamide filaments as a second chemical fiber raw material, wherein the twist number is set to be 40 twists/m; the twisting direction is half S direction and half Z direction, the weaving mode is plain weave 32 weaving, the weaving pitch is set to 80mm, the rope core/middle core double-layer composite weaving structure and a second chemical fiber rope strand are fed into a weaving machine to be woven together, and a rope core/middle core/rope sheath three-layer composite weaving structure is obtained;
and heating the fiber rope with the rope core/middle core/rope skin three-layer composite weaving structure by using a hot oven, keeping the heating temperature at 130 ℃, heating for 5min, and then cooling and shaping at room temperature to obtain the fiber rope capable of improving the bending rigidity.
The fiber rope structure capable of improving bending rigidity obtained in example 1 is schematically shown in fig. 1, and fig. 2 is a schematic cross-sectional view thereof, wherein a core 2 is braided outside a core 1, and a sheath 3 is braided outside the core 2, and the structure is a three-layer composite braided structure.
The flexural rigidity of the fiber rope obtained in example 1 was measured and is shown in table 1. Table 1 shows the performance of the fiber ropes with improved bending stiffness according to examples 1 to 3, in which the absolute value of bending stiffness is mm, which indicates the distance of vertical indentation, and the relative value of bending stiffness indicates the ratio of the distance of vertical indentation to the diameter.
Example 2
The fiber rope capable of improving bending rigidity disclosed in example 2 is prepared by the following steps:
weaving a rope core by taking 50-in-840D polyamide filaments as a first chemical fiber raw material, wherein the twist number is set to be 30 twists/m; the twisting direction is half of S twisting direction and half of Z twisting direction, the weaving mode is 12 weaving rope cores, and the weaving pitch is set to be 100 mm;
taking 4-840D polyamide filaments and 1-840D low-melting-point polyamide filaments as mixed fiber raw materials to weave a central core, wherein the melting point of the low-melting-point polyamide filaments is 98 ℃, the mass content of low-melting-point fibers is 20%, and the twist is set to be 80 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is 12 weaving structure, the weaving pitch is set to be 70mm, the obtained rope core is fed into a weaving machine to be woven together, and the rope core/middle core double-layer composite weaving structure is formed;
weaving a rope sheath by using 11 pieces of 840D polyamide filaments as a second chemical fiber raw material, wherein the twist number is set to be 40 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is plain weave 32 weaving, the weaving pitch is set to 80mm, the rope core/middle core double-layer composite weaving structure and a second chemical fiber rope strand are fed into a weaving machine to be woven together, and the rope core/middle core/rope sheath three-layer composite weaving structure is obtained;
and heating the fiber rope with the rope core/middle core/rope skin three-layer composite weaving structure by using a hot oven, keeping the heating temperature at 130 ℃, heating for 5min, and then cooling and shaping at room temperature to obtain the fiber rope with the bending rigidity improved.
The bending stiffness of the fiber rope obtained in example 2 was measured and is shown in table 1.
Example 3
The fiber rope capable of improving bending rigidity disclosed in example 3 is prepared by the following steps:
weaving a rope core by using 8-in-840D polyamide filaments as a first chemical fiber raw material, wherein the twist number is set to 80 twists/m; the twisting direction is half of S twisting direction and half of Z twisting direction, the weaving mode is 32 weaving rope cores, and the weaving pitch is 75 mm;
taking 2-in-840D polyamide filaments and 1-in-630D low-melting-point polyamide filaments as mixed fiber raw materials to weave a central core, wherein the melting point of the low-melting-point polyamide filaments is 98 ℃, the mass content of low-melting-point fibers is 28%, and the twist is set to be 45 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is 8 weaving structure, the weaving pitch is set to 85mm, the obtained rope core is fed into a weaving machine to be woven together, and the rope core/middle core double-layer composite weaving structure is formed;
weaving a rope sheath by using 25 pieces of 840D polyamide filaments as a second chemical fiber raw material, wherein the twist number is set to be 55 twists/m; the twisting direction is half S twisting direction and half Z twisting direction, the weaving mode is 16 weaving, the weaving pitch is set to be 55mm, the rope core/middle core double-layer composite weaving structure and a second chemical fiber rope strand are fed into a weaving machine to be woven together, and a rope core/middle core/rope sheath three-layer composite weaving structure is obtained;
and heating the fiber rope with the rope core/middle core/rope skin three-layer composite weaving structure by using a hot oven, keeping the heating temperature at 130 ℃, heating for 5min, and then cooling and shaping at room temperature to obtain the fiber rope with the bending rigidity improved.
The flexural rigidity of the fiber rope obtained in example 3 was measured and shown in table 1.
TABLE 1 examples 1-3 fiber rope Performance tables for improving bending stiffness
The fiber rope capable of improving the bending rigidity comprises a mixed fiber layer, low-melting-point chemical fibers in the mixed fiber layer can be melted at a temperature higher than the melting point of the low-melting-point chemical fibers, other fibers in the mixed fibers and the low-melting-point chemical fibers are bonded together, the bonding between the fibers is realized by bonding a plurality of bonding points, a three-dimensional net structure formed by mutually connecting a plurality of fibers through the point bonding points is formed in the mixed fiber layer, and partial three-dimensional net structures are respectively formed between the mixed fiber layer and rope cores and rope skins adjacent to the mixed fiber layer on two sides of the mixed fiber layer, so that a three-layer composite braided structure fiber rope with an integrated integral structure is formed, the bending rigidity of the fiber rope can be effectively improved, and along with the improvement of the content of the low-melting-point fibers in the fiber rope, the bending rigidity of the fiber rope is also improved, and further by adjusting the content of the, the bending stiffness of the fibre rope can be increased.
The technical solutions and the technical details disclosed in the embodiments of the present application are only examples to illustrate the concept of the present application, and do not constitute a limitation to the technical solutions of the present application, and all the inventive changes that are made to the technical details disclosed in the present application without inventive changes have the same inventive concept as the present application, and are within the protection scope of the claims of the present application.
Claims (10)
1. A fiber rope capable of improving bending rigidity is characterized in that the fiber rope is of a three-layer composite weaving structure comprising a rope core, a middle core and a rope sheath, wherein:
the rope core is formed by weaving first chemical fibers;
the central core is arranged outside the rope core and is formed by weaving mixed fibers;
the rope sheath is arranged outside the central core and is formed by weaving second chemical fibers;
the mixed fiber comprises a first chemical fiber and/or a second chemical fiber and at least one third chemical fiber, wherein the melting point of the third chemical fiber is lower than that of the first chemical fiber and the second chemical fiber, and the mass content of the third chemical fiber in the mixed fiber is 5-60%;
the third chemical fiber and the first chemical fiber are bonded with each other through fusion bonding points, a plurality of network structures with the fusion bonding points which are connected with each other are formed on the interface where the rope core is contacted with the central core, the third chemical fiber and the second chemical fiber are bonded with each other through the fusion bonding points, a plurality of network structures with the fusion bonding points which are connected with each other are formed on the interface where the central core is contacted with the rope sheath, and the fiber rope has an integrated integral structure.
2. A fiber rope with increased bending stiffness according to claim 1, characterized in that the first chemical fibers comprise one or a combination of two of polyester fibers and polyamide fibers.
3. The fiber rope capable of improving bending stiffness according to claim 1, wherein the structure of the rope core is one of 12 weaves, 16 weaves, plain 32 weaves, plain 48 weaves, twill 32 weaves and twill 48 weaves, wherein the number of the first chemical fibers is 5-50, the specification of the first chemical fibers is 840D, the twist of the first chemical fibers is set to be 30-120 twists/m, and the weaving pitch is set to be 50-100 mm.
4. A fibre rope with increased bending stiffness according to claim 1, characterised in that the second chemical fibres comprise one or a combination of both of polyester fibres and polyamide fibres.
5. The fiber rope capable of improving bending stiffness according to claim 1, wherein the structure of the rope jacket is one of 12-braid, 16-braid, plain 32-braid, plain 48-braid, twill 32-braid or twill 48-braid, wherein the number of the second chemical fibers is 6-55, the specification of the second chemical fibers is 840D, the twist of the second chemical fibers is set to be 30-100 twists/m, and the braid pitch is set to be 25-80 mm.
6. A fiber rope with increased bending stiffness according to claim 1, wherein the third chemical fiber comprises one or a combination of two of low melting point polyester fiber or low melting point polyamide fiber.
7. A fiber rope with improved bending stiffness according to claim 1, wherein the structure of the core is one of 8-braid, 12-braid or 16-braid, the twist of the mixed fiber is set to 30-60 twist/m, and the braid pitch is set to 70-100 mm.
8. A fiber rope with improved bending stiffness according to claim 1, wherein the third chemical fibers have a gauge of 30-200D, a breaking strength of not less than 3.5g/D, and a melting point of 90-130 ℃.
9. A method for increasing the bending stiffness of a fibre rope, characterized in that the method comprises:
the fiber rope comprises a rope core woven by first chemical fibers and a rope sheath woven by second chemical fibers;
adding at least one layer of mixed fiber between the rope core and the rope sheath, wherein the mixed fiber layer comprises first chemical fibers and/or second chemical fibers and at least one third chemical fiber with a melting point lower than that of the first chemical fibers and the second chemical fibers;
and melting the third chemical fiber to form melting bonding points with the first chemical fiber and the second chemical fiber respectively to form a three-dimensional net structure between the rope core and the central core and between the rope sheath and the central core through the melting point multi-point bonding.
10. A method for increasing the bending stiffness of a fibre rope according to claim 9, wherein said third chemical fibre and said first chemical fibre and/or said second chemical fibre are bonded to each other in said layer of hybrid fibres by means of melt bonds.
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| WO2022104643A1 (en) * | 2020-11-19 | 2022-05-27 | 蔡欣航 | Composite chemical fiber article |
| CN115024613A (en) * | 2022-04-29 | 2022-09-09 | 大自然科技股份有限公司 | Production process of 3E environment-friendly plant fiber mattress |
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Application publication date: 20200407 |