CN107761246B - Radial shrinkage and expansion pipe fabric with friction unlocking rotation and structural phase transformation coupling as well as preparation method and application thereof - Google Patents
Radial shrinkage and expansion pipe fabric with friction unlocking rotation and structural phase transformation coupling as well as preparation method and application thereof Download PDFInfo
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- CN107761246B CN107761246B CN201710937758.1A CN201710937758A CN107761246B CN 107761246 B CN107761246 B CN 107761246B CN 201710937758 A CN201710937758 A CN 201710937758A CN 107761246 B CN107761246 B CN 107761246B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/06—Braid or lace serving particular purposes
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Abstract
The invention discloses a radial shrinkage-expansion tube fabric with friction unlocking rotation and structural phase transformation coupling, a preparation method thereof and application thereof in a slender strip-shaped sampling key component or a sample collection bag. The tubular fabric is a thin tubular fabric which is stable in structure, rigid in axial direction and capable of contracting and expanding in radial direction and is prepared by symmetrically weaving cross knitting yarns and warp yarns with symmetrical angles and friction self-locking action. The preparation method comprises the following steps: preparing warp yarns and cross-knitting yarns and then processing the warp yarns and the cross-knitting yarns; the weaving equipment adopts a circular weaving machine; the warp yarns are arranged on the circular knitting machine in parallel; two groups of yarns of the cross-knitting yarns are mutually crossed at the same but reverse spiral angle and are sequentially knitted with warp yarns to obtain the radial shrinkage-expansion tubular fabric with friction unlocking rotation and structure phase transformation coupling. The pipe fabric prepared by the invention has the advantages of delicate and stable structure, high performance, high toughness and high modulus and convenient preparation; has high drawability and low tensile elongation.
Description
Technical Field
The invention belongs to the technical field of textile design and tubular fabric weaving, and particularly relates to a tubular fabric with high drawing smoothness and low tensile elongation when the tubular fabric is subjected to reverse drawing movement along the inner wall and the outer wall of a slender straight circular tube under the action of stretching and a forming technology thereof.
Background
At present, most of the technologies and processing techniques for forming tube fabrics are reported, certain research is carried out on preparation methods and preparation tools, the application range of the tube fabrics also comprises a plurality of fields of chemistry and chemical engineering, energy transmission, aerospace, biomedical and the like, but related research is mostly focused on weaving, knitting and braiding formed tube fabrics with traditional structures, the research on tube fabrics with variable structure functions is less, and particularly, the tube fabrics with high drawing smoothness and low drawing elongation and the forming technology thereof when the tube fabrics are subjected to back-folding drawing movement along the inner and outer walls of a slender straight circular tube under the stretching action have no research on tube fabrics with radial shrinkage and expansion generated by coupling of friction unlocking rotation and structural phase conversion and the preparation methods thereof.
The tubular fabric with radial elastic shrinkage is prepared by a patent, the fabric is a woven tubular fabric, the warp yarn of the fabric selects fine denier aramid filament yarn, PBO or the mixed yarn of aramid yarn and PBO as the warp yarn, the warp yarn is twisted by 100-300 twists/m, the weft yarn selects aramid filament yarn or composite yarn of PBO filament yarn coated spandex elastic yarn, the woven tubular fabric is designed by taking a plain weave as a basic weave, the wall thickness of the tube of the woven tubular fabric is 0.2-0.3 mm, and the natural inner diameter range can be expanded from 14mm to 22.5 mm. The woven tubular fabric has the characteristics of high longitudinal strength and modulus, flame retardance and high temperature resistance, has the characteristics of no longitudinal elastic deformation, high strength, high temperature resistance, tensile force resistance and chemical corrosion resistance, does not need subsequent treatment, has stable size, lasting elasticity, smooth surface and soft hand feeling, is suitable for being used under the operating conditions of high temperature and the like, and makes up the defect of poor radial elasticity of the existing tubular fabric (Huangyudong, Ligao, Liuli, Fu-hong-Jun, Song-Yujun, Li-Jun, Wang-Caofeng, a preparation method of the tubular fabric with radial elastic shrinkage, patent application No. 201210290417.7, application No. 2012: 15/2012/102776649/14/2012/11/2012/14/11/32/11/7/15/A). The method also prepares the high-strength thin-diameter ultrathin tubular fabric, and solves the problems that the prior tubular fabric preparation method can not realize small caliber and thin tube wall of the tubular fabric and can not meet the requirements of light weight and super-strong tension resistance on the fabric under special conditions. The method selects fine denier PBO filament as warp and weft of tubular fabric, and twists the warp and the weft without twisting. The preparation method can realize the normalization, the size stabilization and the continuity of the ultrathin small-diameter tubular fabric, the product has good adaptability and high production efficiency, and has the characteristics of strong tension resistance, high temperature resistance, flame retardance and chemical corrosion resistance (Huangyudong, Liyanwei, Liuli, Fu, Songyuan army, Li Jun, Wang Caifeng, a preparation method of a high-strength thin-diameter ultrathin tubular fabric, the invention is a patent with the application number of 201210278973.2, the application date of 2012, 08 and 07, the application publication number of CN 102767028A, the application publication date of 2012, 11 and 07), while the art described in these patents relates to radial elastic shrinkage and high strength thin gauge ultra thin tubular fabrics and methods of making, however, the tubular fabric with radial shrinkage and expansion functions provided by the invention is not concerned, and particularly, the tubular fabric with radial shrinkage and expansion caused by coupling of friction unlocking rotation and structural phase transformation provided by the invention and the preparation method thereof are not concerned.
The woven tubular composite material is widely applied to a trenchless lining-turning type pipeline repairing technology, and is used as a high-quality technology for repairing deeply buried underground damaged pipelines, and the technology can well avoid the defects of multiple construction procedures, long construction period, high cost, road surface damage, traffic blockage, resource waste and the like caused by directly excavating road surfaces. In the implementation process, one end of a lining pipe (namely, a tubular woven fabric composite material) filled with resin binder is fixed on a local excavation position on the ground in an overturning manner in advance, then the other end of the lining pipe is pushed by air pressure or water pressure to continuously overturn the lining towards the inside of the pipeline so as to be attached to the inner wall of the damaged pipeline, and finally the lining pipe is lined inside the damaged pipeline in a pipe-in-pipe manner, so that the damaged pipeline is repaired. The tubular woven composite material has no seam, good integrity and sealing performance, uniform fabric structure, uniform circumferential thickness, high strength, balanced stress during lining turnover, no over-concentration of stress, mechanical construction is easy, repair effect is good, and for this reason, a lining pipe has been designed as a tubular woven fabric formed at one time (guzuo, royal, dongdong camphor, danxinhua, machongqi, caohuakou, lasuojie, lining pipe for pipeline repair, utility model patent application No. 200920097021.4, application No. 2009: 09 month in 2009, publication No. CN 201531710U, publication No. 07 month 21 in 2010, zhangqun, lanliang, well country in caohuan, liuyao, a composite material for pipeline inversion repair, utility model patent application No. 201520082925.5, application No. 2015 02 month 05, publication No. CN 204472039U, publication No. 2015 07 month 15 in 2015). The scope of these patent arts only relates to the use of tubular woven composite materials (inner lining tubes are included in the scope of the present invention) under the action of external thrust, but does not relate to the tube fabric with radial shrinkage and expansion function provided by the present invention, and especially does not relate to the tube fabric with radial shrinkage and expansion generated by friction unlocking rotation and structural transformation coupling provided by the present invention and the preparation method thereof.
The radial compliance is the expansion and contraction performance of the artificial blood vessel and the host blood vessel, which is adapted to the test, and is generated by the change of blood pressure, and is an important index in clinical medicine, and the performance of the radial compliance depends on the geometric shape of the blood vessel and the mechanical performance of the blood vessel wall. The radial compliance of blood vessels in different body parts, the same blood vessel under different pressure conditions and different states of smooth muscle are all different. The problem of radial compliance of tubular fabrics has been reported to have been studied for applications in the medical field (j.l · eheng, p.g · acker, intravascular catheters including reinforced micro-tapes, invention patent, application No. 200880119737.8, application date: 2008 12.04, grant No. CN 101888871B, grant No. 2013: 02.13, bucin, chrysine, li jingling, royal, jowar, johao, a textile artificial blood vessel that improves radial compliance, invention patent, application No. 200910197649.6, application date: 2009: 10.23, grant No. CN 101803964B, grant No. 12.14, j.g · houston, r.g · husband, p.a · stan bri, tubular catheters, invention patent, application No. 201080130. X, application No. 2010.17, application No. CN 2011. 102711663, publication No. 2011.2011.2011.2011.22, j.23, a strap ring and a method for manufacturing the strap ring by tubular fabric which is axially cut are disclosed in the invention patent with the application number: 201210336445.8, filing date: 09/12, 2012, application publication No.: CN 102995215 a, application publication date: year 2013, month 03, day 27; s. ornithisco, R. despigrel, chinese finger cot with flat or flattened filaments, patent of invention, application No.: 201280060961.0, filing date: 24/10/2012, application publication No.: CN 103987992 a, application publication date: 13 days 08 month 2014; liubiqiang, Hemin, Zhang Naojun, Liqingfeng, Chengliang and Kudzuvine average wave, a high-strength, high-elasticity and degradable artificial cardiovascular stent and a preparation method thereof, the invention patent is applied to the following patent numbers: 201310198816.5, filing date: 27/05/2013, application publication No.: CN 103272289A, authorized announcement day: 09 month 04 days 2013). The scope described in these patent technologies only relates to research on the compression, shear, shrinkage, expansion and the like of small-caliber tubular fabrics, but none of them relates to the tubular fabrics with radial shrinkage and expansion function provided by the present invention, and especially does not relate to the tubular fabrics with radial shrinkage and expansion generated by coupling friction unlocking rotation and structural phase transformation provided by the present invention and the preparation method thereof.
Disclosure of Invention
The invention aims to solve the problems that: a tubular fabric having high drawing smoothness and low tensile elongation when it is drawn along the inner and outer walls of a long and thin straight circular tube under tension and a forming technique thereof are provided.
The principle of the invention is that the friction unlocking rotation of the crossed braided wires under the action of radial top expansion and extrusion force is coupled with the fabric structure phase transformation (namely yarn buckling and supporting surface transformation) to strengthen the radial expansion or contraction of the thin tubular fabric (tubular fabric), without influencing the elongation of radial yarns, namely the radial expansion and contraction of the tubular fabric is unrelated to radial deformation, namely the radial expansion and contraction of the tubular fabric is not needed to be realized by radial deformation, so that the low tensile elongation of the tubular fabric during drawing can be ensured, and high drawing smoothness can be realized.
In order to solve the problems, the invention provides a radial contracting and expanding tubular fabric with friction unlocking rotation and structural phase conversion coupling, which is characterized in that the tubular fabric is a tubular fabric with stable structure, axial rigidity and radial contracting and expanding, which is prepared by symmetrically weaving crossed knitting yarns with a certain friction self-locking function and warps with relatively thicker, rigid and high machine tension in a symmetrical mode.
Preferably, both sets of the cross-woven yarns use relatively fine denier twisted crimped filament yarns or long/short composite yarns, have an elongation at break of not less than 8%, and are soft thread elastomers of low tensile and flexural modulus.
More preferably, the cross angle of the cross-knitted yarns ranges from 60 degrees to 90 degrees; the relationship between the crossing angle (theta) and the helix angle (phi) of the crossing yarn helix is: theta is 180-2 phi.
More preferably, the crimped filaments in the twisted crimped filament yarn are bundles of high-performance filaments having a crimp rate of not more than 10% and a crimp elastic modulus of more than 80%; the long/short composite yarn is soft, high-elastic and low-modulus composite yarn which is formed by ring spinning of high-performance short fibers and high-performance filaments.
Preferably, the warp yarn of the tube fabric is round multifilament formed by twisting high-strength high-modulus bright filaments, the round multifilament is a high-modulus linear elastomer, and the breaking elongation of the round multifilament is not more than 10%.
More preferably, the filaments are high performance filaments that are crimp-free and have an elongation at break of no more than 7%.
Preferably, during the drawing process of the tube fabric, the warp yarns are subjected to linear elastic shrinkage or straightening, the maximum elastic shrinkage is not more than 4%, so that the low elongation of the tube fabric in the axial direction is ensured, and the maximum elongation is not more than 10%; the cross-knitting yarn can be naturally straightened and bent under low tension without extending due to curling and twisting; meanwhile, the cross-knitting yarn room and the warp yarn room have lower cross-rotation friction torque due to the round section of the yarn body, and are easy to unlock rotation and similar contraction of fork-shaped sliding under the stretching action; when the tubular fabric is coated on the outer wall of the circular tube, under the stretching action, the tubular fabric is subjected to the action of the jacking expansion force of the outer wall of the circular tube, and the crossed yarns on the outer wall of the circular tube are crossed at the crossed points (theta)1) Becomes smaller (theta)1< theta) to radially expand the tube fabric; the cross-knitting yarns can straighten and grow to enable the low tension of the structural phase of the tubular fabric from the weft supporting surface to the warp supporting surface to be changed, namely the diameter of the tubular fabric is obviously increased, the diameter increasing rate is not less than 3%, and the two are combined to obviously reduce the drawing resistance when the tubular fabric is externally coated; when the tubular fabric is lined on the inner wall of the circular tube, under the action of stretching, the tubular fabric is under the action of extrusion force of the inner wall of the circular tube, firstly, the cross-knitting yarns on the inner wall of the circular tube overcome the cross-rotation friction torque between the cross-knitting yarns due to the increase of the stretching force, and a cross angle (theta) is generated by taking the cross point as the center of a circle2) Become large (theta)2Theta) to cause the tube fabric to shrink radially; the cross-knitting yarns are bent due to the flexibility of the cross-knitting yarns, so that the structural phase of the tubular fabric from the warp supporting surface to the weft supporting surface is changed, namely the tubular fabric can generate obvious radial shrinkage, and the shrinkage rate is not less than7%, which combine to reduce the resistance to withdrawal when pressed within the tube fabric.
The invention also provides a preparation method of the radial shrinkage and expansion tubular fabric with the friction unlocking rotation and structure phase transformation coupling, which is characterized by comprising the following steps of:
step 1): preparing warp yarns and cross-knitting yarns and then processing the warp yarns and the cross-knitting yarns; the weaving equipment adopts a circular weaving machine;
step 2): the warp yarns are arranged on the circular knitting machine in parallel;
step 3): two groups of yarns of the cross-knitting yarns are mutually crossed at the same but reverse spiral angle and are sequentially knitted with warp yarns to obtain the radial shrinkage-expansion tubular fabric with friction unlocking rotation and structure phase transformation coupling.
The preparation method can be used for the preparation of the existing tubular fabric, and the weaving formation of the tubular fabric with high drawing smoothness, low tensile elongation and only diameter size change when the inner wall and the outer wall of a slender straight round tube are folded and drawn under the drawing action can not be realized.
The invention also provides application of the radial shrinkage-expansion tube fabric with friction unlocking rotation and structural phase conversion coupling in a slender strip-shaped sampling key part or a sample collecting bag, and the radial shrinkage-expansion tube fabric is suitable for stratum drilling sampling and sample collecting of small blocky solid rocks and soil samples found in space technology, geological investigation and archaeology.
Compared with the prior art, the invention has the beneficial effects that:
the pipe fabric has the advantages of delicate and stable structure, high performance, high toughness and high modulus and convenient preparation;
② has high drawability and low tensile elongation;
and when the sampling component and the sample collection bag are used, the sampling rate is high, the original bedding information can be well kept, and the phenomenon of sample falling does not occur.
Drawings
FIG. 1 is a perspective view of a friction unlocking rotation and structural phase transition coupled radial collapsing tubular fabric provided by the present invention;
FIG. 2a is a plan view of a friction unlocking rotation and structural phase transition coupled radial collapsing tubular fabric provided by the present invention;
FIG. 2b is a plan view of the tube fabric after being subjected to compressive forces;
FIG. 2c is a plan view of the tube fabric after the application of a jacking force;
FIG. 2d is a schematic view of radial contraction and expansion caused by frictional unlocking rotation;
FIG. 2e is a schematic diagram of radial contraction and expansion caused by structural phase transformation;
in the figure: 1-tube fabric, 11-cross-knitted yarn, 12-warp yarn, 13-cross point, 2-round tube, 21-round tube outer wall, 22-round tube inner wall, theta-cross angle, F1-extrusion force, θ1Angle of intersection after application of compressive force, F2-force of top expansion, θ2-angle of intersection after application of top expansion force, A-tube fabric structure microcells, A1-a tube fabric structure microcell after being subjected to a compressive force, A2-a tubular fabric structure microcell after being subjected to a top expansion force;
FIG. 3 is a graph of the pulling force versus time (F-t) experienced by a radially contracting and expanding tubular fabric coupled to a frictional unlocking rotation and a structural phase change.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The raw materials and equipment in examples 1-3 were funded by the national focus development program (2016YFC 0802802).
Example 1
As shown in fig. 1 and 2a-e, for the radial contracting and expanding tubular fabric with friction unlocking rotation and structure phase conversion coupling provided by the invention, the tubular fabric 1 adopts a mode of symmetrically weaving crossed knitting yarns 11 with a certain friction self-locking effect and warp yarns 12 with relative thickness, rigidity and high machine tension to prepare the tubular fabric with stable structure, axial rigidity and radial contracting and expanding.
Both sets of cross-woven yarns 11 are relatively fine, fine denier twisted crimped Nomex filament yarns having an elongation at break of not less than 8% and are soft thread elastomers of low tensile and flexural modulus.
The value of the crossing angle theta in the forming process between the two groups of crossing knitting yarns 11 is 60 degrees; since the crossing angle θ is related to the helix angle φ of the helix of the two crossing yarns 11: theta is 180 DEG-2 DEG, so the helix angle phi is 60 deg.
The warp yarn 12 is a round multifilament formed by twisting high-strength high-modulus Kevlar filaments, is a high-modulus linear elastomer and has the elongation at break not more than 10%.
The tube fabric 1 is characterized in that:
firstly, in the drawing process of the tubular fabric 1, the twisted warp yarns 12 of the high-strength high-modulus have linear elastic shrinkage or straightening, and the maximum elastic shrinkage is not more than 4 percent so as to ensure the low elongation of the tubular fabric 1 in the axial direction, and the maximum elongation is not more than 10 percent; the soft cross-knitting yarn 11 can be naturally straightened and bent under low tension without extending due to the curling and twisting; meanwhile, the twisted cross-woven yarns 11 and the twisted warp yarns 12 have lower cross-rotation friction torque due to the round cross section of the yarn body, and are easy to unlock and rotate under certain stretching action;
secondly, when the tubular fabric 1 is coated on the outer wall 21 of the circular tube, the tubular fabric 1 is subjected to the action of the jacking expansion force of the outer wall 21 of the circular tube under the stretching action, and the crossing angle theta is generated at the crossing point 13 of the crossing braided yarn 11 on the outer wall 21 of the circular tube 21Becomes smaller (theta)1< theta) to radially expand the tube fabric 1; secondly, the cross-knitting yarns 11 are straightened and increased, so that the structural phase of the tubular fabric 1 from the weft supporting surface to the warp supporting surface is changed by low tension, namely the diameter of the tubular fabric 1 is obviously increased, and the diameter increasing rate is not less than 3 percent, so that the combination of the two can obviously reduce the drawing resistance when the tubular fabric 1 is externally coated;
thirdly, when the tubular fabric 1 is lined on the inner wall 22 of the circular tube, under the stretching action, the tubular fabric 1 is extruded by the inner wall 22 of the circular tube, firstly, the cross knitting yarns 11 on the inner wall 22 of the circular tube 2 overcome the cross rotation friction moment among the cross knitting yarns 11 due to the increase of the stretching force, and a cross angle theta is generated by taking the cross point 13 as the center of a circle2Become large (theta)2Theta) to cause the tube fabric 1 to shrink radially; the cross-knitting yarns 11 can be bent due to the flexibility of the cross-knitting yarns, so that the structural phase of the tubular fabric 1 from the warp supporting surface to the weft supporting surface is changed, namely the tubular fabric 1 can generate obvious radial shrinkageThe shrinkage is not less than 7%, so that the combination of the two can obviously reduce the drawing resistance when the tube fabric 1 is extruded.
The preparation method of the radial shrinkage and expansion pipe fabric with the friction unlocking rotation and structure phase transformation coupling comprises the following steps:
step 1: preparing the warp yarns 12, preparing the cross-knitting yarns 11 and weaving; the weaving equipment is a circular weaving machine;
step 2: the warp yarns 12 are arranged in parallel on a circular knitting machine used with a warp density of 180 threads/10 cm;
and step 3: the two sets of yarns of the cross-knitting yarns 11 are mutually crossed at the same but opposite helix angles (60 DEG, -60 DEG) and are knitted sequentially with the warp yarns 12, so as to frictionally unlock the radially contracted and expanded tubular fabric which is coupled with the rotation and the structural transformation.
Example 2
As shown in fig. 1 and 2a-e, for the radial contracting and expanding tubular fabric with friction unlocking rotation and structure phase conversion coupling provided by the invention, the tubular fabric 1 adopts a mode of symmetrically weaving crossed knitting yarns 11 with a certain friction self-locking effect and warp yarns 12 with relative thickness, rigidity and high machine tension to prepare the tubular fabric with stable structure, axial rigidity and radial contracting and expanding.
The two groups of cross-woven yarns 11 are made of relatively thin fine denier twisted crimped PBO filament yarns, have elongation at break of not less than 8 percent and are soft thread elastomers with low tensile modulus and bending modulus.
The value of the crossing angle theta in the forming process between the two groups of crossing knitting yarns 11 is 70 degrees; since the crossing angle θ is related to the helix angle φ of the helix of the two crossing yarns 11: theta is 180 DEG-2 DEG, so the helix angle phi is 55 deg.
The warp yarn 12 is a round multifilament formed by twisting high-strength high-modulus Kevlar filaments, is a high-modulus linear elastomer and has the elongation at break not more than 10%.
The tube fabric 1 is characterized in that:
firstly, in the drawing process of the tubular fabric 1, the twisted warp yarns 12 of the high-strength high-modulus have linear elastic shrinkage or straightening, and the maximum elastic shrinkage is not more than 4 percent so as to ensure the low elongation of the tubular fabric 1 in the axial direction, and the maximum elongation is not more than 10 percent; the soft cross-knitting yarn 11 can be naturally straightened and bent under low tension without extending due to the curling and twisting; meanwhile, the twisted cross-woven yarns 11 and the twisted warp yarns 12 have lower cross-rotation friction torque due to the round cross section of the yarn body, and are easy to unlock and rotate under certain stretching action;
secondly, when the tubular fabric 1 is coated on the outer wall 21 of the circular tube, the tubular fabric 1 is subjected to the action of the jacking expansion force of the outer wall 21 of the circular tube under the stretching action, and the crossing angle theta is generated at the crossing point 13 of the crossing braided yarn 11 on the outer wall 21 of the circular tube 21Becomes smaller (theta)1< theta) to radially expand the tube fabric 1; secondly, the cross-knitting yarns 11 are straightened and increased, so that the structural phase of the tubular fabric 1 from the weft supporting surface to the warp supporting surface is changed by low tension, namely the diameter of the tubular fabric 1 is obviously increased, and the diameter increasing rate is not less than 3 percent, so that the combination of the two can obviously reduce the drawing resistance when the tubular fabric 1 is externally coated;
thirdly, when the tubular fabric 1 is lined on the inner wall 22 of the circular tube, under the stretching action, the tubular fabric 1 is extruded by the inner wall 22 of the circular tube, firstly, the cross knitting yarns 11 on the inner wall 22 of the circular tube 2 overcome the cross rotation friction moment among the cross knitting yarns 11 due to the increase of the stretching force, and a cross angle theta is generated by taking the cross point 13 as the center of a circle2Become large (theta)2Theta) to cause the tube fabric 1 to shrink radially; and secondly, the cross-woven yarns 11 can be bent due to the flexibility of the cross-woven yarns, so that the structural phase of the tubular fabric 1 from the warp support surface to the weft support surface is changed, namely the tubular fabric 1 can generate obvious radial shrinkage, the shrinkage rate is not less than 7%, and the drawing resistance of the tubular fabric 1 during internal extrusion can be obviously reduced by combining the two.
The preparation method of the radial shrinkage and expansion pipe fabric with the friction unlocking rotation and structure phase transformation coupling comprises the following steps:
step 1: preparing the warp yarns 12, preparing the cross-knitting yarns 11 and weaving; the weaving equipment is a circular weaving machine;
step 2: the warp yarns 12 are arranged in parallel on a circular knitting machine used with a warp density of 200 yarns/10 cm;
and step 3: the two sets of yarns of the cross-knitting yarns 11 are mutually crossed at the same but opposite helix angles (55 DEG, -55 DEG) and are knitted sequentially with the warp yarns 12, so as to frictionally unlock the radially contracted and expanded tubular fabric which is coupled with the rotation and the structural transformation.
Example 3
As shown in fig. 1 and 2a-e, for the radial contracting and expanding tubular fabric with friction unlocking rotation and structure phase conversion coupling provided by the invention, the tubular fabric 1 adopts a mode of symmetrically weaving crossed knitting yarns 11 with a certain friction self-locking effect and warp yarns 12 with relative thickness, rigidity and high machine tension to prepare the tubular fabric with stable structure, axial rigidity and radial contracting and expanding.
The two groups of cross-woven yarns 11 are made of relatively thin fine-denier twisted crimped PI filament yarns, have the elongation at break of not less than 8 percent and are soft thread elastomers with low tensile modulus and bending modulus.
The value of the crossing angle theta when the two groups of crossing knitting yarns 11 are formed is 80 degrees; since the crossing angle θ is related to the helix angle φ of the helix of the two crossing yarns 11: theta is 180 DEG-2 DEG, so the helix angle phi is 50 deg.
The warp yarn 12 is a round multifilament formed by twisting high-strength high-modulus Kevlar filaments, is a high-modulus linear elastomer and has the elongation at break not more than 10%.
The tube fabric 1 is characterized in that:
firstly, in the drawing process of the tubular fabric 1, the twisted warp yarns 12 of the high-strength high-modulus have linear elastic shrinkage or straightening, and the maximum elastic shrinkage is not more than 4 percent so as to ensure the low elongation of the tubular fabric 1 in the axial direction, and the maximum elongation is not more than 10 percent; the soft cross-knitting yarn 11 can be naturally straightened and bent under low tension without extending due to the curling and twisting; meanwhile, the twisted cross-woven yarns 11 and the twisted warp yarns 12 have lower cross-rotation friction torque due to the round cross section of the yarn body, and are easy to unlock and rotate under certain stretching action;
secondly, when the tubular fabric 1 is coated on the outer wall 21 of the circular tube, the tubular fabric 1 is subjected to the action of the jacking expansion force of the outer wall 21 of the circular tube under the stretching action, and the crossing angle theta is generated at the crossing point 13 of the crossing braided yarn 11 on the outer wall 21 of the circular tube 21Becomes smaller (theta)1< theta) to make the tubular fabric 1 diameterExpanding; secondly, the cross-knitting yarns 11 are straightened and increased, so that the structural phase of the tubular fabric 1 from the weft supporting surface to the warp supporting surface is changed by low tension, namely the diameter of the tubular fabric 1 is obviously increased, and the diameter increasing rate is not less than 3 percent, so that the combination of the two can obviously reduce the drawing resistance when the tubular fabric 1 is externally coated;
thirdly, when the tubular fabric 1 is lined on the inner wall 22 of the circular tube, under the stretching action, the tubular fabric 1 is extruded by the inner wall 22 of the circular tube, firstly, the cross knitting yarns 11 on the inner wall 22 of the circular tube 2 overcome the cross rotation friction moment among the cross knitting yarns 11 due to the increase of the stretching force, and a cross angle theta is generated by taking the cross point 13 as the center of a circle2Become large (theta)2Theta) to cause the tube fabric 1 to shrink radially; and secondly, the cross-woven yarns 11 can be bent due to the flexibility of the cross-woven yarns, so that the structural phase of the tubular fabric 1 from the warp support surface to the weft support surface is changed, namely the tubular fabric 1 can generate obvious radial shrinkage, the shrinkage rate is not less than 7%, and the drawing resistance of the tubular fabric 1 during internal extrusion can be obviously reduced by combining the two.
The preparation method of the radial shrinkage and expansion pipe fabric with the friction unlocking rotation and structure phase transformation coupling comprises the following steps:
step 1: preparing the warp yarns 12, preparing the cross-knitting yarns 11 and weaving; the weaving equipment is a circular weaving machine;
step 2: the warp yarns 12 are arranged in parallel on a circular knitting machine used with a warp density of 220 yarns/10 cm;
and step 3: the two sets of yarns of the cross-knitting yarns 11 are mutually crossed at the same but opposite helix angles (50 DEG, -50 DEG) and are knitted sequentially with the warp yarns 12, so as to frictionally unlock the radially contracted and expanded tubular fabric which is coupled with the rotation and the structural transformation.
As shown in fig. 3, the radial shrinkage-expansion tubular fabric prepared in examples 1 to 3 and coupled with friction unlocking rotation and structural phase transition and the conventional tubular fabric were subjected to a drawing force test on a tubular fabric drawing smoother, and a drawing force-time (F-t) curve graph of the tubular fabric was obtained. The following 5 formulas are combined, the change conditions of the tensile force value, the fabric thickness and the radial strain of the radial shrinkage-expansion tubular fabric and the conventional tubular fabric which are subjected to friction unlocking rotation and structural phase conversion coupling at the maximum drawing force are mainly analyzed, the reduction rate, the fall-back rate or the improvement rate of related parameters are obtained, and specific data indexes are shown in table 1.
The reduction rate delta of the maximum withdrawal force of the tubular fabric of the invention compared to conventional tubular fabricsFmax@The calculation formula of (2) is as follows:
in the formula, Fmax0-maximum withdrawal force to which a conventional tubular fabric is subjected; fmax@-maximum withdrawal force to which the tube fabric of the invention is subjected.
The tubular fabric, including the invention, has a thickness drop-back δ at maximum withdrawal force compared to the thickness of the fabric in its natural stateTFmaxThe calculation formula of (2) is as follows:
in the formula, To-the thickness of the tubular fabric in its natural state; t isFmax-the thickness of the tubular fabric at the maximum withdrawal force.
The tube fabric of the present invention has a thickness improvement rate delta at maximum draw-off force compared to conventional tube fabricsTFmax@The calculation formula of (2) is as follows:
in the formula, TFmax0-thickness of the conventional tube fabric at maximum withdrawal force; t isFmax@-the thickness of the tube fabric of the invention at the maximum withdrawal force.
The tube fabric of the present invention has an improved rate of radial strain delta at maximum withdrawal force compared to conventional tube fabricsεjFmax@The calculation formula of (2):
in the formula, epsilonjFmax0Radial strain, ε, of conventional tube fabrics at maximum withdrawal forcejFmax@-the radial strain of the tube fabric of the invention at maximum withdrawal force.
The tube fabric of the invention has a stretch improvement δ ε after drawing compared to conventional tube fabricslFmax@The calculation formula of (2) is as follows:
in the formula, epsilonlFmax0Tensile deformation after drawing of conventional tubular fabrics, εlFmax@-the stretch deformation rate of the tube fabric according to the invention after drawing.
TABLE 1
In Table 1, Fmax-maximum withdrawal force to which the tubular fabric is subjected; deltaFmax@-the reduction in maximum withdrawal force of the tube fabric produced according to the invention compared to conventional tube fabrics; to-the thickness of the tubular fabric in its natural state; t isFmax-the thickness of the tubular fabric at maximum withdrawal force; deltaTFmax-the thickness drop-back rate of the tubular fabric at maximum withdrawal force; deltaTFmax@-the rate of improvement in thickness at maximum draw-off force of the tube fabric produced by the present invention compared to conventional tube fabrics; epsilonjFmax-radial strain of the tubular fabric at maximum withdrawal force; deltaεjFmax@-the rate of improvement of radial strain at maximum withdrawal force of the tube fabric prepared according to the invention compared to conventional tube fabrics; epsilonlFmax-the stretch deformation rate of the tubular fabric after the drawing action; deltaεlFmax@The tube fabric produced according to the invention has an improved stretch after drawing compared with conventional tube fabrics.
As can be seen from fig. 3 and table 1, the maximum withdrawal force of the radial shrinkage-expansion tube fabric coupled with the frictional unlocking rotation and the structural phase transition is reduced by more than 50% and the stretching is improved by more than 35% compared with the conventional tubular fabric. It is thus demonstrated that the tube fabric has a significantly reduced pull-out resistance, an improved smoothness of the fabric through the circular tube, a reduced elongation deformation of the fabric and a more stable size.
Claims (8)
1. A friction unlocking rotation and structure phase transformation coupling radial contracting and expanding tubular fabric is characterized in that the tubular fabric (1) is a tubular fabric which is stable in structure, rigid in axial direction and capable of contracting and expanding in radial direction and is manufactured in a mode that cross knitting yarns (11) and warp yarns (12) which are symmetrical in angle and have friction self-locking function are symmetrically knitted; in the drawing process of the tubular fabric (1), the warp yarns (12) are subjected to linear elastic shrinkage or straightening, the maximum elastic shrinkage is not more than 4 percent, so that the low elongation of the tubular fabric (1) in the axial direction is ensured, and the maximum elongation is not more than 10 percent; the cross knitting yarn (11) can be naturally straightened and bent under low tension without extending because of curling and twisting; meanwhile, the cross-knitting yarns (11) and the cross-knitting yarns (12) have lower cross-rotation friction torque due to the round cross section of the yarn body, and are easy to perform unlocking rotation and Y-shaped sliding contraction under the stretching action; when the tubular fabric (1) is coated on the outer wall (21) of the circular tube (2), under the stretching action, the tubular fabric (1) is under the action of the top expansion force of the outer wall (21) of the circular tube (2), and the cross yarns (11) on the outer wall (21) of the circular tube (2) are crossed and rotated at the crossing points (13) with the crossing angle reduced, so that the tubular fabric (1) is expanded in the radial direction; the cross-knitting yarns (11) stretch and grow to enable the low tension of the structural phase of the tubular fabric (1) from the weft supporting surface to the warp supporting surface to be changed, namely the diameter of the tubular fabric (1) is increased, the diameter increasing rate is not less than 3%, and the two are combined to reduce the drawing resistance when the tubular fabric (1) is externally coated; when the tubular fabric (1) is lined on the inner wall (22) of the circular tube (2), under the stretching action, the tubular fabric (1) is subjected to the extrusion force action of the inner wall (22) of the circular tube (2), firstly, the crossed knitting yarns (11) on the inner wall (22) of the circular tube (2) overcome the crossed rotating friction moment among the crossed knitting yarns (11) due to the increase of stretching force, and the crossed rotation with the crossed point (13) as the circle center and the crossed angle being increased occurs, so that the tubular fabric (1) generates radial contraction; the cross knitting yarns (11) are bent due to the flexibility of the cross knitting yarns, so that the structure phase of the tubular fabric (1) from the warp support surface to the weft support surface is changed, namely the tubular fabric (1) can shrink radially, the shrinkage rate is not less than 7%, and the two are combined to reduce the drawing resistance when the tubular fabric (1) is extruded.
2. The friction-unlocked rotational-structural-phase-change-coupled radially-expandable tubular fabric as claimed in claim 1, wherein said cross-woven yarns (11) in both sets are twisted crimped filament yarns or long/short composite yarns having an elongation at break of not less than 8%.
3. The friction unlocking rotation and structure phase transition coupled radial shrinkage-expansion tubular fabric according to claim 2, characterized in that the crossing angle θ of the cross-knitting yarns (11) ranges from 60 ° to 90 °; the relationship between the crossing angle theta and the helix angle phi of the helix of the cross-knitting yarn (11) is: theta is 180-2 phi.
4. The friction unlocking rotation and structure phase transition coupled radial shrinkage-expansion tube fabric of claim 2, wherein the crimped filaments in the twisted crimped filament yarn are high performance filament bundles having a crimp rate of not more than 10% and a crimp elastic modulus of more than 80%; the long/short composite yarn is a composite yarn formed by ring spinning of staple fibers and filaments.
5. The friction-unlocking rotation and structure-phase-change coupled radial shrinkage-expansion tubular fabric as claimed in claim 1, characterized in that the warp (12) of the tubular fabric (1) is a round multifilament formed by twisting filaments, and the breaking elongation is not more than 10%.
6. The friction unlocking rotational and structural phase transition coupled radial shrinkage and expansion tubular fabric of claim 5, wherein the filaments are high performance filaments having no crimp and elongation at break of not more than 7%.
7. A method for preparing a friction unlocking rotation and structure phase transition coupled radial expansion tube fabric according to any one of claims 1 to 6, which comprises the following steps:
step 1): preparing warp yarns (12) and cross-knitting yarns (11) and weaving; the weaving equipment adopts a circular weaving machine;
step 2): the warp yarns (12) are arranged on the circular knitting machine in parallel;
step 3): two groups of yarns of the cross-knitting yarns (11) are mutually crossed at the same but reverse helix angles phi + and phi-, and are sequentially knitted with warp yarns (12) to obtain the radial shrinkage-expansion tubular fabric with friction unlocking rotation and structure phase transformation coupling.
8. Use of a friction unlocking rotation and structural transformation coupled radial expansion tube fabric according to any one of claims 1 to 6 in an elongated strip-like sampling member or sample collection bag.
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| CN201710937758.1A CN107761246B (en) | 2017-10-10 | 2017-10-10 | Radial shrinkage and expansion pipe fabric with friction unlocking rotation and structural phase transformation coupling as well as preparation method and application thereof |
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|---|---|---|---|---|
| WO1998024616A1 (en) * | 1996-12-02 | 1998-06-11 | A & P Technology, Inc. | Braided structure with elastic bias strands |
| CN1201381A (en) * | 1995-11-01 | 1998-12-09 | 生物相容有限公司 | Braided stent |
| CN1046976C (en) * | 1993-05-03 | 1999-12-01 | 德里弗莱克斯公司 | Preform or matrix tubular structure for well casing |
| WO2013043526A1 (en) * | 2011-09-20 | 2013-03-28 | Aga Medical Corporation | Device and method for treating vascular abnormalities |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020087176A1 (en) * | 2000-10-10 | 2002-07-04 | Greenhalgh E. Skott | Anastomosis device |
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2017
- 2017-10-10 CN CN201710937758.1A patent/CN107761246B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046976C (en) * | 1993-05-03 | 1999-12-01 | 德里弗莱克斯公司 | Preform or matrix tubular structure for well casing |
| CN1201381A (en) * | 1995-11-01 | 1998-12-09 | 生物相容有限公司 | Braided stent |
| WO1998024616A1 (en) * | 1996-12-02 | 1998-06-11 | A & P Technology, Inc. | Braided structure with elastic bias strands |
| WO2013043526A1 (en) * | 2011-09-20 | 2013-03-28 | Aga Medical Corporation | Device and method for treating vascular abnormalities |
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