CN112680867B - Safety airbag and preparation method thereof - Google Patents
Safety airbag and preparation method thereof Download PDFInfo
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- CN112680867B CN112680867B CN202011458992.4A CN202011458992A CN112680867B CN 112680867 B CN112680867 B CN 112680867B CN 202011458992 A CN202011458992 A CN 202011458992A CN 112680867 B CN112680867 B CN 112680867B
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C9/00—Healds; Heald frames
- D03C9/02—Healds
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D1/00—Woven fabrics designed to make specified articles
- D03D1/02—Inflatable articles
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D11/00—Double or multi-ply fabrics not otherwise provided for
- D03D11/02—Fabrics formed with pockets, tubes, loops, folds, tucks or flaps
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D25/00—Woven fabrics not otherwise provided for
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/04—Control of the tension in warp or cloth
- D03D49/06—Warp let-off mechanisms
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
Abstract
The invention relates to an air bag and a preparation method thereof, wherein the air bag comprises a polyester fabric for the air bag, a silica gel coating and an air valve; the polyester fabric for the safety airbag comprises a double-layer woven fabric formed by interweaving warp yarns and weft yarns; all warp yarns on the double-layer woven fabric are parallel to a plane where any warp yarn in a bent shape is located, and all weft yarns are parallel to a plane where any weft yarn in a bent shape is located; the warp density and the weft density at all positions are the same; the preparation method comprises the following steps: weaving a polyester fabric for the safety airbag, arranging an air inlet hole on the polyester fabric, connecting the polyester fabric with a gas generator to form an air bag of the safety airbag, uniformly spraying a layer of silica gel inside the fabric to form a silica gel coating, carrying out vulcanization treatment, and then installing a safety air valve to obtain the safety airbag; the preparation method of the safety airbag can directly weave the fabric with the curved surface shape, simplify the composite forming process, and the prepared safety airbag is low in cost, good in mechanical property and high in safety.
Description
Technical Field
The invention belongs to the technical field of automobile safety spare parts, and relates to an air bag and a preparation method thereof.
Background
The safety airbag fabric is the most important component of the safety airbag system, and the performance of the safety airbag fabric is directly related to the safety of drivers and passengers, so the safety airbag fabric has the advantages of small packaging volume, quick inflation and deflation, no need of maintenance for a long time, excellent mechanical performance and the like. The common air bag is a sewing type fabric and is formed by sewing two layers of two-dimensional fabrics, although the two-dimensional fabrics are convenient to process and low in production cost, the air bag fabric of the type has the following defects: if stress concentrates on the sewn portion when the airbag is deployed, seam slippage at the sewn portion tends to increase, and the restraint performance after deployment tends to deteriorate.
In the airbag made of woven fabric in the prior art, the ratio of the energy absorption EW in the warp direction to the energy absorption EF in the weft direction is 0.5-2.0, which indicates that the warp and weft are not uniformly stressed and is one of unsafe factors causing the working errors of the airbag.
Disclosure of Invention
The invention aims to solve the technical problem that the working errors of an air bag are easily caused by uneven stress of warps and wefts in the air bag in the prior art, and provides the air bag and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for manufacturing an airbag comprises the following steps:
(1) weaving a polyester fabric for an airbag: during weaving, the weaving area of the polyester fabric for the airbag adopts a double-layer weave weaving process, the upper layer and the lower layer are both plain weaves, no binding exists between the layers, and a single-layer plain woven fabric (woven by adopting a single-layer plain weaving process) is arranged around the weaving area (about 10cm distance) of the polyester fabric for the airbag as transition; when each tissue point is formed, setting the corresponding heddle eye height in the weaving area of the polyester fabric for the safety airbag, and cutting and finishing to obtain the polyester fabric for the safety airbag;
in the weaving area of the polyester fabric for the safety airbag, the calculation method of the heddle eye height comprises the following steps:
order to
Then
Wherein h isijThe harness eye height (cm) of a weave point formed by an ith weft yarn and a jth warp yarn when weaving a weaving area of the polyester fabric for the airbag is 1, wherein i is equal to 1, m, j is equal to 1, n is the number of beating-up times, and n is the number of warp yarns; lambda [ alpha ]Weft yarnWeft density, lambda, of the woven region of polyester fabric for airbagsWarp beamWarp density (each defined as the number of yarns arranged in parallel perpendicular to the longitudinal direction within a length of 10cm) of a woven region of a polyester fabric for an airbag; radian is used as a unit of angle;
the surface shape of the fabric formed in the weaving area of the polyester fabric for the airbag is a revolution surface, the generatrix of the revolution surface is in an elliptical arc shape, H is the projection length of the generatrix of the revolution surface on the rotating shaft of the generatrix, and R is the radius of the bottom circular surface of the revolution surface;
in the weaving area of the polyester fabric for the safety airbag, the odd number of the warp yarns and the odd number of the weft yarns form an upper layer of the polyester fabric for the safety airbag, and the even number of the warp yarns and the even number of the weft yarns form a lower layer of the polyester fabric for the safety airbag; when i is an odd number and j is an odd number, the formed weave point is a weave point in the upper layer of the double-layer structure of the polyester fabric for the airbag; when i is an even number and j is an even number, the formed weave point is a weave point in the lower layer of the double-layer structure of the polyester fabric for the airbag;
when the safety airbag is woven by polyester fabric, a grid-shaped support body with the same surface of revolution is placed in a region from a corresponding cloth fell to a first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed; the number of the plurality of thin plates can be calculated according to the distance between the adjacent thin plates and the thickness of the thin plates and the width of the whole grid-shaped support body.
When the introduced weft yarns are punched into the weaving opening by the reed, the weft yarns are distributed along the upper surface of the supporting body one by one and can support the warp yarns to ensure the stability of the shape of the woven curved surface.
When the airbag is woven by the weaving area of the polyester fabric, each warp yarn is independently and passively sent under the condition of constant tension;
(2) the polyester fabric for the safety airbag is provided with an air inlet hole which is used for being connected with a gas generator (a component of an automobile safety airbag system);
(3) uniformly spraying a layer of silica gel inside the fabric to form a silica gel coating and carrying out vulcanization treatment so as to ensure the air tightness of the air bag of the safety air bag;
(4) and installing a safety air valve to obtain the safety air bag.
As a preferred technical scheme:
according to the preparation method of the airbag, in the step (3), the viscosity of the silica gel is 20000cP to 250000cP, and the coating weight of the silica gel is 15 to 20g/m2。
The method for manufacturing the airbag, the warp density lambda of the polyester fabric weaving area for the airbagWarp beam120-170 pieces/10 cm, weft density lambda of polyester fabric weaving area for safety air bagWeft yarnAll are 120-170 roots/10 cm.
According to the preparation method of the airbag, the warp yarns and the weft yarns are both polyester fibers, the fineness of the polyester fibers is 1000 dtex-2000 dtex, the breaking strength is not less than 7.2cN/dtex, and the elongation at break is 15.0-18.5%.
In the method for manufacturing an airbag fabric, the method for weaving an airbag fabric includes the steps of forming each weave point before weft insertion, after weft insertion, or after beating-up; the thin plate is made of metal;
the tension of the warp yarns is 70-100 cN/warp yarn; the tension of the weft yarns is 20-35 cN/piece;
the winding speed is 0.9-4.2 cm/min, and the beating-up speed is 13-17 pieces/min.
According to the preparation method of the airbag, when each tissue point is formed, the horizontal distance from the tissue point to the heddle eyes of the first row of heddles is set to be 2-5 times of the height of the lifting heddle; the height of the lifting heddle is the height of the heddle eyes of the first row of heddles compared with the horizontal plane of the weft yarn during weft insertion.
In the method for manufacturing the airbag, passive let-off refers to the adoption of a torsion spring type tension adjusting device. The package of warp yarns is placed on a creel, and the yarn drawn from each bobbin is provided with a torsion spring type tension adjusting device, and the tension of each warp yarn in the let-off process is kept constant.
The height of the heddle eye of the heddle corresponding to each warp yarn is adjusted before each beating-up, and the heddle eyes are respectively and independently connected with different lifting mechanisms to control the lifting of the heddles to a certain height.
The airbag prepared by the preparation method of the airbag comprises the polyester fabric for the airbag, a silica gel coating and an air valve;
the polyester fabric for the safety airbag comprises a double-layer woven fabric formed by interweaving warp yarns and weft yarns;
all warp yarns on the double-layer woven fabric are parallel to a plane where any warp yarn in a bent shape is located; all weft yarns on the double-layer woven fabric are parallel to the plane where any one of the bent weft yarns is located;
the warp density and the weft density of each part of the double-layer woven fabric are the same.
The edges of the double-layer woven fabric are connected by a single-layer plain weave machine fabric, the upper layer and the lower layer of the double-layer woven fabric can be separated up and down, and a symmetrical closed three-dimensional structure (the structure is the same as that of an air bag) taking the plane of the bottom circle surface of the revolution surface as a symmetrical plane is formed; it should be noted that the shape referred to herein is a shape obtained by ignoring microscopic undulations of the woven fabric surface caused by the interweaving of warp and weft yarns;
as a preferred technical scheme:
the airbag is characterized in that when one layer of the polyester fabric for the airbag is stretched to a stress of 118N/cm and then relaxed to a stress of 0N/cm, the energy absorption EW in the warp direction is 1.5-3.3J/cm2The energy absorption EF in the weft direction is 1.5-3.3J/cm2Energy absorption in the warp directionThe ratio of the amount EW to the energy absorption amount EF in the weft direction is 0.9 to 1.1.
The mechanism of the invention is as follows:
in the prior art, compared with a two-dimensional fabric, the three-dimensional fabric does not need to be cut and sewn during composite forming, the integrity of the fabric is improved, the composite forming process is simplified, and the prepared polyester fabric for the safety airbag has great superiority in the integral delamination resistance, impact resistance and fatigue resistance compared with a two-dimensional woven fabric composite material.
Compared with the integrally formed three-dimensional fabric in the prior art, the plane of the weft yarn in the three-dimensional curved surface area is not parallel to each other on the integrally formed three-dimensional fabric in the prior art, and the fabric integrally presents uneven warp density and weft density in different areas, so that the uneven fabric structure can cause uneven stress on each area when the fabric is stressed; on the basis that all the warp yarns are parallel to the plane where the warp yarns of the three-dimensional curved surface area are located and all the weft yarns are parallel to the plane where the weft yarns of the three-dimensional curved surface area are located, the warp and weft densities in all the areas are uniform, and the uniform stress of the integrally-formed three-dimensional fabric is guaranteed.
In order to prepare the polyester fabric for the airbag, the polyester fabric for the airbag is woven by adopting a grid-shaped support body, compared with a special-shaped roll reeling method, in the weaving process of the special-shaped roll reeling method, the linear speed at the small end area of the special-shaped roll is smaller than the linear speed at the large end area of the special-shaped roll, so that the density of weft yarns at the small end area of the special-shaped roll is greater than that at the large end area of the special-shaped roll, and the density of weft yarns of the three-dimensional fabric prepared by the special-shaped roll reeling method cannot be uniform; the grid-shaped support body adopted by the invention is formed by arranging and combining a plurality of plane sheets at equal intervals, when in weaving, the thickness direction of the sheets is the same as the weft yarn direction, the sheets can smoothly enter between reed dents, the interval between the adjacent sheets is the interval between the adjacent reed dents of the reed, and the thickness of each sheet is smaller than 1/3 of the interval between the adjacent reed dents of the reed, so that the existence of the sheets does not influence the interweaving of yarns, the weft yarns can be arranged at equal intervals when in beating, the weft yarns are linear in the projection direction of the prepared fabric, and when in winding at a constant speed, the density of the weft yarns is uniform; the warp density is controlled by a reed, and the warp density can be ensured to be consistent by a conventional reed and a standard drafting process.
Furthermore, when weaving the single-layer plain weave fabric (plane area) of the weaving area of the polyester fabric for the airbag as a transition, the warp yarns are interwoven according to the normal weaving process of the woven fabric; when weaving the weaving area (curved surface area) of the polyester fabric for the safety airbag, according to the form of the curved surface area, the height of the heddle eyes and the let-off quantity are controlled, and the let-off quantity increment of the warp yarns in the curved surface areas with different heights is different, and the general principle is as follows: the height of the heddle eyes penetrated by the warp yarns participating in the weaving of the curved surface area is different from that of the heddle eyes penetrated by the warp yarns participating in the weaving of the plane area, and the height of the heddle eyes penetrated by the warp yarns participating in the weaving of the upper area of the curved surface area is higher than that of the heddle eyes penetrated by the warp yarns participating in the weaving of the lower area of the curved surface area; the heights of the front beam and the back beam are consistent and are kept unchanged in the weaving process, when the height of a brown eye, corresponding to the height of the front beam or the back beam, of the warp yarn is 0 when the warp yarn is returned to the heald flat position, the warp yarn and the weft yarn are interwoven to form a plane area, and when the height of the brown eye, corresponding to the height of the front beam or the back beam, of the warp yarn is not 0 when the warp yarn is returned to the heald flat position, the warp yarn and the weft yarn are interwoven to form a curved surface area.
In addition, the grid-shaped support body adopted in the method is simple to prepare, and the special-shaped roll curling method is used for preparing the three-dimensional fabric, and the special-shaped roll corresponding to the action of the grid-shaped support body is in a three-dimensional shape, so that the processing is very complex.
In the weaving process of the polyester fabric for the airbag, the polyester fabric is suitable for passive let-off, because the shedding height difference of each warp yarn of the three-dimensional fabric with small curvature is small during weaving, the warp yarn with high shedding height cannot exceed the length adjusting space of a tension device (namely, under constant tension) in a passive let-off system because of being excessively pulled out, the process is simple, and the application range is wide. The purpose of passive let-off is to ensure that the let-off amount and the tension are controllable and accurate, thereby ensuring that the density of the woven three-dimensional fabric is uniform.
The invention adopts an integrally formed three-dimensional fabric, which comprises a double-layer woven fabric as a main body, wherein the edges of the double-layer woven fabric are connected by a single-layer plain weave fabric, and the upper layer and the lower layer of the double-layer woven fabric part are unfolded to form a symmetrical closed three-dimensional structure; the structure has uniform integral density, the airbag prepared from the structure has good constraint performance after being unfolded, and the ratio of the energy absorption EW in the warp yarn direction to the energy absorption EF in the weft yarn direction is close to 1, which shows that the airbag of the invention has better safety.
Advantageous effects
(1) According to the preparation method of the airbag, warp and weft yarns are interwoven on the curved surface by controlling the warp yarn let-off amount and the lifting heald stroke, and the three-dimensional polyester plain cloth with the same warp density and weft density can be prepared;
(2) in an airbag of the present invention, the ratio of the energy absorption amount EW in the warp direction to the energy absorption amount EF in the weft direction is close to 1.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A method for manufacturing an airbag comprises the following steps:
preparing raw materials: the warp yarns and the weft yarns are both polyester fibers, the fineness of the polyester fibers is 1260dtex, the breaking strength is 7.5cN/dtex, and the elongation at break is 16.5%.
(1) Weaving a polyester fabric for an airbag: during weaving, the weaving area of the polyester fabric for the airbag is prepared by adopting a double-layer weave weaving process, the upper layer and the lower layer are both plain weaves, no binding exists between the layers, and a single-layer plain woven fabric (woven by adopting a single-layer plain weaving process) is arranged around the weaving area (10cm distance) of the polyester fabric for the airbag as transition; when each tissue point is formed (after beating-up), setting the corresponding heddle eye height in the weaving area of the polyester fabric for the safety airbag, and cutting and finishing to obtain the polyester fabric for the safety airbag;
in the weaving area of the polyester fabric for the safety airbag, the calculation method of the heddle eye height comprises the following steps:
order to
Then
Wherein h isijThe harness eye height (cm) of a weave point formed by an ith weft yarn and a jth warp yarn when weaving a weaving area of the polyester fabric for the airbag is 1, wherein i is equal to 1, m, j is equal to 1, n is the number of beating-up times, and n is the number of warp yarns; lambda [ alpha ]Weft yarnWeft density (136 threads/10 cm), lambda of the woven region of the polyester fabric for an airbagWarp beamWarp density (136 threads/10 cm) of a polyester fabric woven region for an airbag; radian is used as a unit of angle; the surface shape of the fabric formed in the weaving area of the polyester fabric for the airbag is a revolution surface, the generatrix of the revolution surface is in an elliptical arc shape, H is the projection length of the generatrix of the revolution surface on the rotating shaft of the generatrix, and R is the radius of the bottom circular surface of the revolution surface;
in the weaving area of the polyester fabric for the safety airbag, the odd number of the warp yarns and the odd number of the weft yarns form an upper layer of the polyester fabric for the safety airbag, and the even number of the warp yarns and the even number of the weft yarns form a lower layer of the polyester fabric for the safety airbag; when i is an odd number and j is an odd number, the formed weave point is a weave point in the upper layer of the double-layer structure of the polyester fabric for the airbag; when i is an even number and j is an even number, the formed weave point is a weave point in the lower layer of the double-layer structure of the polyester fabric for the airbag;
when the safety airbag is woven by polyester fabric, a grid-shaped support body with the same surface of revolution is placed in a region from a corresponding cloth fell to a first row of heddles; the grid-shaped support body is formed by connecting a plurality of metal sheets which are arranged at equal intervals, the thickness direction of the sheets is the same as the weft yarn direction, the interval between every two adjacent sheets is the interval between every two adjacent dents of the reed, and the thickness of each sheet is 1/3 smaller than the interval between every two adjacent dents of the reed;
when the airbag is woven by the weaving area of the polyester fabric, a torsion spring type tension adjusting device is adopted to independently and passively send warp yarns to each warp yarn under the condition of constant tension; the tension of the warp yarns is 100 cN/piece; the tension of the weft yarn is 35 cN/piece; the winding speed is 1.5cm/min, the beating-up speed is 17 pieces/min, and the adjustment of the heddle eye height of the heddle corresponding to each warp yarn before each beating-up is realized by respectively and independently connecting different heddles with different lifting mechanisms and controlling each heddle to lift by a certain height. In the formation of each weave point, the horizontal distance from the weave point to the heddle eye of the first row of heddles is set to be 4 times the height of the lifting heddle.
The prepared polyester fabric for the safety airbag comprises a double-layer woven fabric formed by interweaving warp yarns and weft yarns; all warp yarns on the double-layer woven fabric are parallel to a plane where any warp yarn in a bent shape is located; all weft yarns on the double-layer woven fabric are parallel to the plane where any one of the bent weft yarns is located; the warp density and the weft density of each part of the double-layer woven fabric are the same.
When one layer of the polyester fabric for an airbag was stretched to a stress of 118N/cm and then relaxed to a stress of 0N/cm, the ratio of the energy absorption EW in the warp direction to the energy absorption EF in the weft direction was 1.1.
(2) The polyester fabric for the safety airbag is provided with an air inlet hole which is used for being connected with a gas generator of an automobile safety airbag system;
(3) uniformly spraying a layer of silica gel inside the fabric to form a silica gel coating and carrying out vulcanization treatment so as to ensure the air tightness of the air bag of the safety air bag; wherein the silica gel used has a viscosity of 250000cP and a coating weight of 20g/m2。
(4) And installing a safety air valve on the polyester fabric for the safety air bag to obtain the safety air bag.
The prepared safety airbag comprises a polyester fabric for the safety airbag, a silica gel coating and a safety valve.
Claims (9)
1. A preparation method of an air bag is characterized by comprising the following steps:
(1) weaving a polyester fabric for an airbag: when weaving, the weaving area of the polyester fabric for the safety airbag adopts a double-layer weave weaving process, the upper layer and the lower layer are both plain weaves, no binding exists between the layers, and a single-layer plain woven fabric is arranged around the weaving area of the polyester fabric for the safety airbag to be used as transition; setting the corresponding heddle eye height in the weaving area of the polyester fabric for the safety airbag when each weave point is formed, and preparing the polyester fabric for the safety airbag;
in the weaving area of the polyester fabric for the safety airbag, the calculation method of the heddle eye height comprises the following steps:
order to
Then
Wherein h isijThe harness eye height of a weave point formed by an ith weft yarn and a jth warp yarn when weaving a weaving area of the polyester fabric for the airbag is 1,. m, j is 1,. n, m is the number of beating-up times, and n is the number of warp yarns; lambda [ alpha ]Weft yarnWeft density, lambda, of the woven region of polyester fabric for airbagsWarp beamA warp density of a polyester fabric woven region for an airbag; radian is used as a unit of angle;
the surface shape of the fabric formed in the weaving area of the polyester fabric for the airbag is a revolution surface, the generatrix of the revolution surface is in an elliptical arc shape, H is the projection length of the generatrix of the revolution surface on the rotating shaft of the generatrix, and R is the radius of the bottom circular surface of the revolution surface;
in the weaving area of the polyester fabric for the safety airbag, the odd number of the warp yarns and the odd number of the weft yarns form an upper layer of the polyester fabric for the safety airbag, and the even number of the warp yarns and the even number of the weft yarns form a lower layer of the polyester fabric for the safety airbag; when i is an odd number and j is an odd number, the formed weave point is a weave point in the upper layer of the double-layer structure of the polyester fabric for the airbag; when i is an even number and j is an even number, the formed weave point is a weave point in the lower layer of the double-layer structure of the polyester fabric for the airbag;
when the safety airbag is woven by polyester fabric, a grid-shaped support body with the same surface of revolution is placed in a region from a corresponding cloth fell to a first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed;
when the airbag is woven by the weaving area of the polyester fabric, each warp yarn is independently and passively sent under the condition of constant tension;
(2) the polyester fabric for the safety airbag is provided with an air inlet hole which is used for being connected with a gas generator;
(3) uniformly spraying a layer of silica gel inside the fabric to form a silica gel coating and carrying out vulcanization treatment;
(4) and installing a safety air valve to obtain the safety air bag.
2. The method for manufacturing an airbag according to claim 1, wherein the viscosity of the silica gel in the step (3) is 20000cP to 250000cP, and the coating amount of the silica gel is 15 g/m to 20g/m2。
3. The method of claim 1, wherein the warp density λ of the polyester fabric woven region for an airbag isWarp beam120-170 pieces/10 cm, weft density lambda of polyester fabric weaving area for safety air bagWeft yarnAll are 120-170 roots/10 cm.
4. The method of claim 1, wherein the warp and weft are polyester fibers, the fineness of the polyester fibers is 1000dtex to 2000dtex, the breaking strength is greater than or equal to 7.2cN/dtex, and the elongation at break is 15.0 to 18.5%.
5. The method for producing an airbag according to claim 1, wherein in the weaving method of the fabric for an airbag, before, after, or after beat-up is performed at the time of forming each weave point; the thin plate is made of metal;
the tension of the warp yarns is 70-100 cN/warp yarn; the tension of the weft yarns is 20-35 cN/piece;
the winding speed is 0.9-4.2 cm/min, and the beating-up speed is 13-17 pieces/min.
6. The method of claim 5, wherein the horizontal distance from the weave point to the eyelets of the first row of heddles is set to 2 to 5 times the height of the lifting heddle.
7. The method of claim 1, wherein the passive let-off is a torsion spring type tension adjusting device.
8. The airbag manufactured by the manufacturing method of the airbag according to any one of claims 1 to 7, comprising a polyester fabric for an airbag, a silica gel coating and an air valve;
the polyester fabric for the safety airbag comprises a double-layer woven fabric formed by interweaving warp yarns and weft yarns; the upper layer and the lower layer are both plain weave, and no binding exists between the layers;
all warp yarns on the double-layer woven fabric are parallel to a plane where any warp yarn in a bent shape is located; all weft yarns on the double-layer woven fabric are parallel to the plane where any one of the bent weft yarns is located;
the warp density and the weft density of each part of the double-layer woven fabric are the same.
9. The airbag according to claim 8, wherein when one layer of the polyester fabric for an airbag is stretched to a stress of 118N/cm and then relaxed to a stress of 0N/cm, an energy absorption amount EW in the warp direction is 1.5 to 3.3J/cm2Energy absorption in the weft directionThe EF is 1.5-3.3J/cm2The ratio of the energy absorption amount EW in the warp direction to the energy absorption amount EF in the weft direction is 0.9 to 1.1.
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| CN202011458992.4A CN112680867B (en) | 2020-12-11 | 2020-12-11 | Safety airbag and preparation method thereof |
| PCT/CN2021/135287 WO2022121792A1 (en) | 2020-12-11 | 2021-12-03 | Safety airbag and manufacturing method therefor |
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| CN202011458992.4A CN112680867B (en) | 2020-12-11 | 2020-12-11 | Safety airbag and preparation method thereof |
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| CN112680867B (en) * | 2020-12-11 | 2022-05-10 | 江苏恒力化纤股份有限公司 | Safety airbag and preparation method thereof |
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| CN111621898A (en) * | 2020-05-20 | 2020-09-04 | 华懋（厦门）新材料科技股份有限公司 | One-step forming braided fabric for safety airbag |
| CN112680867B (en) * | 2020-12-11 | 2022-05-10 | 江苏恒力化纤股份有限公司 | Safety airbag and preparation method thereof |
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| FR2940173A1 (en) * | 2008-12-23 | 2010-06-25 | Snecma | METHOD FOR MANUFACTURING A SHAPE PIECE THROUGH 3D FABRIC AND SHAPE PIECE THUS OBTAINED |
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| WO2022121792A1 (en) | 2022-06-16 |
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