CN113650379A - Double-layer composite one-step forming safety airbag and manufacturing method thereof - Google Patents
Double-layer composite one-step forming safety airbag and manufacturing method thereof Download PDFInfo
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- CN113650379A CN113650379A CN202110944976.4A CN202110944976A CN113650379A CN 113650379 A CN113650379 A CN 113650379A CN 202110944976 A CN202110944976 A CN 202110944976A CN 113650379 A CN113650379 A CN 113650379A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/024—Woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0004—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0017—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor characterised by the choice of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0065—Heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/02—Inflatable articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
- B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
- B60R2021/23504—Inflatable members characterised by their material characterised by material
- B60R2021/23509—Fabric
- B60R2021/23514—Fabric coated fabric
Abstract
The invention discloses a double-layer composite one-step forming safety airbag and a manufacturing method thereof, wherein the method comprises the following steps: a double-layer fabric with a cavity arranged inside; the gas barrier film is hot-pressed and attached to the front and back surfaces of the double-layer fabric, and comprises: a bonding layer embedded in the fiber gaps of the double-layer fabric; and a gas barrier layer arranged outside the bonding layer and positioned at the outer layer of the double-layer fabric; the melting point of the bonding layer is between 110 and 160 ℃, and the thickness of the bonding layer is 10 to 40 um; the fusing point of choke layer is 35 ~ 50 ℃ higher than the adhesive linkage, and the choke layer thickness is 10 ~ 40um, chooses the different adhesive linkage and the choke layer of fusing point for use, melts the adhesive linkage through the difference of fusing point, lets the adhesive linkage imbed in the fabric fibre gap, makes the sealed suture tissue department that the adhesive linkage can be fine, avoids from suture tissue department gas leakage, and the outside sets up one deck choke layer again, even if the phenomenon of gas leakage appears, the volume of restriction gas leakage that also can be fine.
Description
Technical Field
The invention relates to an air bag, in particular to a double-layer composite one-step forming air bag and a manufacturing method thereof.
Background
The automobile industry in China is developed, automobiles are now in thousands of households, and the automobiles in China are kept the first in the world. With the increase of automobiles, traffic accidents are rapidly increased, and the requirements of consumers on the safety configuration of the automobiles are higher and higher, so that the requirements are no longer met by the prior main and auxiliary airbags, and the curtain type safety airbags are basically configured in the middle-end automobile type.
The conventional pressure-maintaining one-step forming curtain type safety airbag production process is to perform organic silicon coating on the front and back surfaces of a double-layer fabric. The air bag fabric width is wider, 2.2 meters to 3 meters are usually available, the control on the gram weight stability of the coating is difficult during production, suture tissues are arranged at the outline of the double-layer fabric air bag, the suture tissues can be thinner than the double-layer cavity by 0.06-0.11 mm, and the air bag base cloth has uneven thickness, so that the coating is easy to have coating weak points at the suture tissues, and the air leakage points can appear on part of products when the one-step forming air bag is used for testing and maintaining pressure, thereby influencing the product stability. In the process of coating the organic silicon, a large amount of energy is consumed by heating and curing the adhesive surface by using hot air. And the organic silicon belongs to thermosetting materials, the safety airbag fabric belongs to thermoplastic materials, and the organic silicon and the safety airbag fabric are combined together, so that the recycling of materials at the scrapped later stage of the automobile is not facilitated.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a hot-press composite one-step formed automobile airbag and a preparation method thereof, which can improve the stability of pressure maintaining of the one-step formed airbag while meeting the performance requirements of the automobile industry.
The invention provides a double-layer composite one-step forming safety airbag which can effectively solve the problems.
The invention is realized by the following steps:
a dual layer composite one shot airbag comprising:
a double-layer fabric with a cavity arranged inside;
the gas barrier film is hot-pressed and attached to the front and back surfaces of the double-layer fabric, and comprises:
a bonding layer embedded in the fiber gaps of the double-layer fabric; and
the gas barrier layer is arranged outside the bonding layer and positioned at the outer layer of the double-layer fabric;
the melting point of the bonding layer is between 110 and 160 ℃, and the thickness of the bonding layer is 10 to 40 um; the melting point of the gas barrier layer is 35-50 ℃ higher than that of the bonding layer, and the thickness of the gas barrier layer is 10-40 um.
As a further improvement, the double-layer fabric is formed by interweaving warp yarns and weft yarns, the strength of the warp yarns and the weft yarns is greater than 6.5g/D, and the density of the warp yarns and the weft yarns is 200-840D.
As a further improvement, the suture tissue of the double-layer fabric is a combination of 2/2 and 3/3, and the width of the suture tissue is 7-14 mm.
As a further improvement, the melting point of the gas barrier layer is greater than the melting point of the adhesive layer.
As a further improvement, the gas barrier film is made of one or two of copolyamide, polyolefin, thermoplastic polyurethane, copolyester, copolymer of polyester hard segment and polyether soft segment.
A double-layer composite one-step forming safety air bag comprises the following steps:
s1; compiling: weaving double-layer fabrics by adopting a jacquard loom, and tying the double-layer fabrics together to form a cavity inside to obtain air bag base cloth;
s2; refining: refining the air bag base fabric by using a refining agent, wherein the refining temperature is 85-95, and the vehicle speed is 15-25 m/min;
s3; shaping: shaping and drying the refined air bag base fabric at the drying temperature of 130-180 ℃ for 70S;
s4; hot pressing: selecting a gas barrier film, heating the gas barrier film and the air bag base fabric, wherein the gas barrier film is divided into a bonding layer and a gas barrier layer, heating the bonding layer and the gas barrier layer to a temperature between the melting point of the bonding layer and the melting point of the gas barrier layer, and pressing the fabric and the gas barrier film by using a roller to melt the bonding layer and press the bonding layer into the double-layer fabric, wherein the gas barrier layer stays on the surface of the double-layer fabric;
s5; and (3) cooling: and cooling and rolling the compounded fabric, and cutting the safety airbag according to the size contour line.
As a further improvement, the refining agent is Tuona chemistry
CDA 02。
As a further improvement, the pressure of the rolling is 10-40N/mm.
The invention has the beneficial effects that:
the invention adopts a thermal compounding process, selects the bonding layer and the air barrier layer with different melting points, melts the bonding layer through the difference of the melting points, and leads the bonding layer to be embedded into the fabric fiber gap, so that the bonding layer can well seal the suture tissue to avoid air leakage from the suture tissue, and the air barrier layer is arranged outside, thus the air leakage amount can be well limited even if the air leakage phenomenon occurs.
Compared with the traditional coating process, the hot-pressing composite one-step forming safety airbag is more energy-saving, the hot-pressing composite one-step forming safety airbag directly heats the fabric and the gas barrier film by using the hot roller, the energy utilization rate is high, the traditional coating process heats the coating surface by using hot air at 160-190 ℃, the energy consumption is high, the single energy consumption is about 3-4 GJ/h, the single energy consumption is about 0.5-0.8 GJ/h by using hot-pressing composite, and the hot-pressing composite production process of the hot press has more energy-saving property.
The gas barrier film and the double-layer fabric adopted by the invention are both made of thermoplastic materials, which is more beneficial to the recovery of the air bag after the air bag is exploded, and if the coating thermosetting resin is adopted, the thermosetting resin material and the thermoplastic material are combined together and need to be separated separately, and the recovery step is troublesome, which often causes resource waste.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a plan view of a balloon formed by a double layer fabric of the present invention with stitches arranged in series in a specific pattern and a cavity.
Fig. 2 is a schematic view of the cut surface structure of the cavity of the air bag.
Detailed Description
The embodiments of the present invention are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating the purposes, technical solutions and advantages of the embodiments of the present invention, which will be described in detail and fully with reference to the accompanying drawings in the embodiments of the present invention. All other implementations that can be derived by one of ordinary skill in the art based on the embodiments of the present invention show or imply relative importance or implicitly indicate the number of technical features indicated, without inventive step. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Firstly, the yarn material specification and the warp and weft density of the double-layer fabric of the air bag are set.
Drawing a corresponding pattern plate diagram as shown in figure 1 according to the drawing size requirement of the automobile part, wherein the diagram shown in figure 1 is only a schematic diagram, and the size requirements of the outlines, cavities, lugs and sewing lines of air bags of different vehicle types are different.
The drawn card pattern is led into a jacquard loom and woven to obtain the double-layer fabric of the air bag with the suture tissue 8, wherein the suture tissue 8 is formed by changing and combining 2/2 and 3/3, and the air bag is formed in one step, the suture tissue 8 is not needed to be sewn and spliced among tissues, but the suture tissue 8 is still needed among the cavities 2, and the thickness of the suture tissue 8 is thinner than that of the double-layer fabric.
Refining the double-layer fabric, wherein the refining agent comprises the following components: tuona chemistry
The CDA 02 adopts 2-7 g/L NaOH of 2-6 g/L, the refining temperature of 85-95 and the vehicle speed of 15-25 m/min.
And (4) shaping and drying the refined double-layer fabric, wherein the shaping temperature is 130-180 ℃, and the shaping time is 70S.
The material of the gas barrier film can be one or two of copolyamide, polyolefin, thermoplastic polyurethane, copolyester, copolymer of polyester hard segment and polyether soft segment.
The method comprises the steps of carrying out front hot pressing film pasting on the double-layer fabric of the air bag, carrying out heating treatment on the gas barrier film and the fabric, heating the gas barrier film and the fabric to a temperature between the melting point of the bonding layer 7 and the melting point of the gas barrier layer 6, carrying out rolling on the fabric and the gas barrier film by using a roller, wherein the pressure is 10-40N/mm, so that the bonding layer 7 of the gas barrier film is melted and pressed between fibers and the weaving point of the fabric, the bonding layer 7 is embedded into the fabric, and the gas barrier layer 6 of the gas barrier film is stopped on the surface of the fabric.
And (2) carrying out reverse hot-pressing film pasting on the double-layer fabric of the air bag, carrying out heating treatment on the gas barrier film and the fabric, heating the gas barrier film and the fabric to a temperature between the melting point of the bonding layer 7 and the melting point of the gas barrier layer 6, pressurizing the fabric and the gas barrier film by using a roller, wherein the pressure is 10-40N/mm, the bonding layer 7 of the gas barrier film is melted and pressed between fibers and the weaving point of the fabric, the bonding layer 7 is embedded into the fabric, and the gas barrier layer 6 of the gas barrier film is stopped on the surface of the fabric.
The melting point of the gas barrier layer 6 must be higher than that of the adhesive layer 7, so that the gas barrier layer 6 can still be left outside as another protection when the adhesive layer 7 penetrates into the textile fibers and the weaving point.
And cooling and rolling the compounded fabric, and cutting the airbag according to the size contour line 1 by using a laser cutting bed.
Example one
Selecting polyester yarns, wherein the linear density is 470dtex, and the strength is as follows: 7.2g/D, double layer fabric density set as: the density of warp yarns 4 is 410 yarns/10 cm and the density of weft yarns 3 is 410 yarns/10 cm.
The tattoo image was performed according to fig. 1, with suture tissue 8 using 2/2 and 3/3 in combination, and with suture width set: 9mm, the card pattern is guided into a jacquard loom for weaving.
Refining the double-layer fabric, wherein the refining agent comprises the following components: tuona chemistry
CDA 02, the amount of 4g/L, NaOH 5g/L, the refining temperature of 90 ℃, and the vehicle speed of 20 m/min.
And (4) shaping and drying the refined double-layer fabric, wherein the shaping temperature is 160 ℃, and the shaping time is 70S.
Selecting a copolyester film as a gas barrier film material, wherein the melting point of the bonding layer 7 is 110-120 ℃, the thickness is 30um, the melting point of the gas barrier layer 6 is 150-160 ℃, and the thickness is 20 um.
The double-layer fabric of the airbag is subjected to front-side hot-pressing film pasting, the gas barrier film and the fabric are subjected to heating treatment, the fabric and the gas barrier film are heated to 145 ℃, the fabric and the gas barrier film are pressed and rolled by a roller, the pressure is 15N/mm, the adhesive layer 7 of the gas barrier film is melted and pressed between fibers and fabric weaving points, the adhesive layer 7 is embedded into the double-layer fabric, and the functional layer 6 of the gas barrier film stays on the surface of the fabric.
The method comprises the steps of carrying out reverse side hot pressing film pasting on double-layer fabrics of the air bag, heating the gas barrier film and the fabrics to 145 ℃, pressing the fabrics and the gas barrier film by a roller with the pressure of 20N/mm, melting the adhesive layer 7 of the gas barrier film, pressing the adhesive layer 7 between fibers and between fabric weaving points, embedding the adhesive layer 7 into the double-layer fabrics, and enabling the functional layer 6 of the gas barrier film to stay on the surfaces of the fabrics, wherein the pressure for pressing the reverse side is greater than the pressure for pressing the front side, and the pressure is applied to the two sides simultaneously, so that the pressure needs to be increased.
And cooling and rolling the compounded fabric, and cutting the airbag according to the size contour line 1 by using a laser cutting bed.
Example two
Selecting polyester yarns, wherein the linear density is 470dtex, and the strength is as follows: 7.2/D, double layer fabric density set as: the warp density is 410 strips/10 cm, and the weft density is 410 strips/10 cm.
The tattoo image was performed according to fig. 1, with suture tissue 8 using 2/2 and 3/3 in combination, and with suture width set: 9mm, the card pattern is guided into a jacquard loom for weaving.
Refining the double-layer fabric, wherein the refining agent comprises the following components: tuona chemistry
CDA 02, the amount of 4g/L, NaOH 5g/L, refining temperature 90 ℃, and vehicle speed 20 m/min.
And (4) shaping and drying the refined double-layer fabric, wherein the shaping temperature is 160 ℃, and the shaping time is 70S.
The material of the gas barrier film is selected to be copolyamide, the melting point of the bonding layer 7 is 115-125 ℃, the thickness is 30um, the melting point of the gas barrier layer 6 is 155-165 ℃, and the thickness is 20 um.
The double-layer fabric of the air bag is subjected to front hot pressing film pasting, the gas barrier film and the fabric are subjected to heating treatment, the fabric and the gas barrier film are heated to 150 ℃, the fabric and the gas barrier film are pressed and rolled by a roller, the pressure is 15N/mm, the adhesive layer 7 of the gas barrier film is melted and pressed between fibers and fabric weaving points, the adhesive layer 7 is embedded into the double-layer fabric, and the functional layer 6 of the gas barrier film stays on the surface of the fabric.
The air bag double-layer fabric is subjected to reverse side hot pressing film pasting, the gas barrier film and the fabric are heated to 150 ℃, the fabric and the gas barrier film are pressed by a roller, the pressure is 20N/mm, the bonding layer 7 of the gas barrier film is melted and pressed between fibers and fabric weaving points, the bonding layer 7 is embedded into the double-layer fabric, and the functional layer 6 of the gas barrier film stays on the surface of the fabric.
And cooling and rolling the compounded fabric, and cutting the airbag according to the size contour line 1 by using a laser cutting bed.
EXAMPLE III
Selecting polyester yarns, wherein the linear density is 470dtex, and the strength is as follows: 7.2/D, double layer fabric density set as: the warp density is 410 strips/10 cm, and the weft density is 410 strips/10 cm.
The tattoo image was performed according to fig. 1, with suture tissue 8 using 2/2 and 3/3 in combination, and with suture width set: 9mm, the card pattern is guided into a jacquard loom for weaving.
Refining the double-layer fabric, wherein the refining agent comprises the following components: tuona chemistry
CDA 02, the amount of 4g/L, NaOH 5g/L, refining temperature 90 ℃, and vehicle speed 20 m/min.
And (4) shaping and drying the refined double-layer fabric, wherein the shaping temperature is 160 ℃, and the shaping time is 70S.
The material of the gas barrier film is thermoplastic polyurethane, the melting point of the bonding layer 7 is 120-135 ℃, the thickness of the bonding layer is 30um, the melting point of the gas barrier layer 6 is 170-185 ℃, and the thickness of the gas barrier layer is 20 um.
The double-layer fabric of the air bag is subjected to front-side hot-pressing film pasting, the gas barrier film and the fabric are subjected to heating treatment, the fabric and the gas barrier film are heated to 160 ℃, the fabric and the gas barrier film are pressed and rolled by a roller, the pressure is 20N/mm, the adhesive layer 7 of the gas barrier film is melted and pressed between fibers and fabric weaving points, the adhesive layer 7 is embedded into the double-layer fabric, and the functional layer 6 of the gas barrier film stays on the surface of the fabric.
The air bag double-layer fabric is subjected to reverse side hot pressing film pasting, the gas barrier film and the fabric are heated to 160 ℃, the fabric and the gas barrier film are pressed by a roller, the pressure is 25N/mm, the bonding layer 7 of the gas barrier film is melted and pressed between fibers and fabric weaving points, the bonding layer 7 is embedded into the double-layer fabric, and the functional layer 6 of the gas barrier film stays on the surface of the fabric.
And cooling and rolling the compounded fabric, and cutting the airbag according to the size contour line 1 by using a laser cutting bed.
Comparative examples
Comparative examples a conventional silicone coating process was used, specifically as follows:
selecting polyester yarns, wherein the linear density is 470dtex, and the strength is as follows: 7.2g/D, double layer fabric density set as: the warp density is 410 strips/10 cm, and the weft density is 410 strips/10 cm.
The tattoo image was performed according to fig. 1, with suture tissue 8 using 2/2 and 3/3 in combination, and with suture width set: 9mm, the card pattern is guided into a jacquard loom for weaving.
Refining the double-layer fabric, wherein the refining agent comprises the following components: tuona chemistry
CDA 02, the amount of 4g/L, NaOH 5g/L, refining temperature 90 ℃, and vehicle speed 20 m/min.
And (4) shaping and drying the refined double-layer fabric, wherein the shaping temperature is 160 ℃, and the shaping time is 70S.
And (3) carrying out an organic silicon coating on the front surface of the double-layer fabric, wherein the gram weight of the coating is 65-75 g/square meter, and heating the organic silicon coating by using hot air of a tunnel oven to cure the organic silicon coating at the temperature of 160-190 ℃ for 90S.
And (3) carrying out an organic silicon coating on the reverse side of the double-layer fabric, wherein the gram weight of the coating is 65-75 g/square meter, and heating the organic silicon coating by using hot air of a tunnel oven to cure the organic silicon coating at the temperature of 160-190 ℃ for 90S.
And cooling and rolling the coated airbag fabric, and cutting the airbag according to the size contour line 1 by using a laser cutting bed.
Table 1 shows the comparison of the pressure holding force test performance of the first, second and third examples and the comparative example:
the test method comprises the following steps: when the inflation pressure rises to 55kpa, the equipment automatically closes the air inlet valve; the air pressure starts to drop, when the air pressure value drops to 50kpa, timing is started, and the air pressure value after 12s is read and recorded.
As can be seen from the first embodiment, the second embodiment, the third embodiment and the comparative embodiment in the above Table 1, the dwell pressure stability can be improved significantly by using the hot-pressing film pasting process, the variance of the test values is between 0.07 and 0.11, while the variance of the coating process used in the comparative embodiment is 5.18.
The comparative example uses a conventional coating process, and because the tension of the broad cloth cover is unstable, the difference of the tension exists between the left side, the middle side and the right side of the cloth cover, the gram weight of the coating is unstable, and the fluctuation of the pressure maintaining test value is large; the inevitable reasons for this are: suture tissue 8 is arranged on the outline of the double-layer fabric airbag, the suture tissue 8 is thinner than the double-layer cavity by 0.06-0.11 mm, and the coating is easy to have a coating weak point at the suture tissue 8 due to uneven thickness of the airbag base fabric, so that the pressure maintaining test is unstable.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A double-layer composite one-shot forming airbag is characterized by comprising:
a double-layer fabric with a cavity arranged inside;
the gas barrier film is hot-pressed and attached to the front and back surfaces of the double-layer fabric, and comprises:
a bonding layer embedded in the fiber gaps of the double-layer fabric; and
the gas barrier layer is arranged outside the bonding layer and positioned at the outer layer of the double-layer fabric;
the melting point of the bonding layer is between 110 and 160 ℃, and the thickness of the bonding layer is 10 to 40 um; the melting point of the gas barrier layer is 35-50 ℃ higher than that of the bonding layer, and the thickness of the gas barrier layer is 10-40 um.
2. The double-layer composite one-step forming airbag as claimed in claim 1, wherein the double-layer fabric is formed by interweaving warp yarns and weft yarns, the strength of the warp yarns and the weft yarns is greater than 6.5g/D, and the density of the warp yarns and the weft yarns is 200-840D.
3. The double-layer composite one-shot forming airbag according to claim 1, wherein the double-layer fabric has a stitch of 2/2, 3/3 in combination, and the width of the stitch is 7-14 mm.
4. The airbag of claim 1, wherein the gas barrier layer has a melting point greater than that of the adhesive layer.
5. The two-layer composite one-shot airbag according to claim 1, wherein the gas barrier film is made of one or two of copolyamide, polyolefin, thermoplastic polyurethane, copolyester, copolymer of hard polyester segment and soft polyether segment.
6. A manufacturing method of a double-layer composite one-step forming safety airbag is characterized by comprising the following steps:
s1; compiling: weaving double-layer fabrics by adopting a jacquard loom, and tying the double-layer fabrics together to form a cavity inside to obtain air bag base cloth;
s2; refining: refining the air bag base fabric by using a refining agent, wherein the refining temperature is 85-95, and the vehicle speed is 15-25 m/min;
s3; shaping: shaping and drying the refined air bag base fabric at the drying temperature of 130-180 ℃ for 70S;
s4; hot pressing: selecting a gas barrier film, heating the gas barrier film and the air bag base fabric, wherein the gas barrier film is divided into a bonding layer and a gas barrier layer, heating the bonding layer and the gas barrier layer to a temperature between the melting point of the bonding layer and the melting point of the gas barrier layer, and pressing the fabric and the gas barrier film by using a roller to melt the bonding layer and press the bonding layer into the double-layer fabric, wherein the gas barrier layer stays on the surface of the double-layer fabric;
s5; and (3) cooling: and cooling and rolling the compounded fabric, and cutting the safety airbag according to the size contour line.
7. The method for manufacturing the double-layer composite one-step forming safety airbag according to claim 6, wherein the refining agent is Tuona chemical
CDA 02。
8. The method for manufacturing the double-layer composite one-step forming airbag as claimed in claim 6, wherein the pressure of the rolling is 10-40N/mm.
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