Fabric edge sealing structure and one-step formed safety air bag
By designing different weaving methods and material selections for different float lengths, the fabric density and pressure retention effect of one-piece molded airbags have been improved, solving the problems of large fabric damage and unsatisfactory pressure retention effect in the existing technology, and realizing a high-safety-factor airbag design.
Patent Information
- Application Number
- CN202520618887.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-04-03
AI Technical Summary
Existing one-piece molded OPW airbags cause significant damage to fabric properties during the weaving process and have unsatisfactory pressure-holding effects. They usually require a high amount of silicone coating to achieve the required pressure-holding effect, resulting in high costs.
The inner edge sealing structure is a first plain weave formed by alternating warp and weft yarns. The outer edge sealing structure is a first variable plain weave formed by alternating warp and weft yarns at the straight edges of the fabric, and a second plain weave at the corner edges. By designing different float lengths of interlacing, the fabric density and pressure retention effect are improved, and the strength of the bag is ensured by nylon or polyester materials.
It achieves a high safety factor for the airbag, which can withstand air pressure of over 45 kPa, prevents rupture, reduces yarn performance loss, and improves the overall structural integrity and pressure retention effect of the fabric.
Smart Images
Figure CN223821633U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of airbag technology, and in particular to a fabric edge sealing structure and a one-piece molded airbag. Background Technology
[0002] Car safety has always been a top priority for society. Car safety systems include airbags, seat belts, and other safety features. Airbags and seat belts work together to effectively protect the lives of people inside the vehicle.
[0003] Currently, commonly used automotive airbags on the market include DAB, SAB, KAB, CAB, and OPW. Compared to the older CAB sewn airbags, OPW airbags, made in a single piece, reduce labor costs and promote automation. However, the weaving process of current single-piece OPW airbags causes significant damage to the fabric's properties, and the pressure-holding effect is not ideal, generally around 35 kPa. Therefore, a higher amount of silicone coating is usually required to achieve the desired pressure-holding effect, resulting in higher costs. Utility Model Content
[0004] The purpose of this invention is to provide a fabric edge sealing structure and a one-piece molded airbag, which has a good pressure-holding effect.
[0005] To achieve the above objectives, this utility model discloses a fabric edge sealing structure, wherein the fabric edge includes a straight edge and a corner edge, and includes an inner edge sealing structure, a transition structure and an outer edge sealing structure, wherein the transition structure is located between the inner edge sealing structure and the outer edge sealing structure;
[0006] The inner sealing structure is a first square plain structure formed by the warp and weft yarns interlacing with the same first float length;
[0007] The outer edge sealing structure is a first variable square plain structure formed by alternating interlacing of warp and weft yarns at the straight edge of the fabric; while the outer edge sealing structure is a second square plain structure formed by alternating interlacing of warp and weft yarns at the corner edge of the fabric; the warp float length and weft float length of the first variable square plain structure are both greater than the first float length, and the warp float length and weft float length of the second square plain structure are less than or equal to the first float length.
[0008] With the above settings, by designing the outer edge sealing structure located at the straight edge of the fabric as a first variable square plain weave, a denser interlacing point can be formed, significantly improving the fabric's tightness. Meanwhile, the outer edge sealing structure located at the corner edge of the fabric is designed as a second square plain weave. The warp and weft floats of the first variable square plain weave are both greater than those of the second square plain weave, thus preventing the outer edge sealing structure from cycling too long at the corner edge, affecting the smoothness of the corner and avoiding the risk of gas penetration at the corner. This also improves the pressure-holding effect. Furthermore, the warp and weft floats of the outer edge sealing structure, or the first variable square plain weave (because the fabric edge of the airbag is mainly straight, the outer edge sealing structure is mostly the first variable square plain weave), are greater than the first float of the first square plain weave. This combination achieves a mechanical gradient of outer rigidity and inner flexibility, reducing impact damage to the fabric and protecting the overall structural integrity. Additionally, the differentiated elastic modulus of the inner and outer layers can buffer cyclic stress (such as repeated bending), delaying material fatigue.
[0009] Preferably, the warp and weft buoyancy lengths of the first variable square flat structure are equal, both being the second buoyancy length; the warp and weft buoyancy lengths of the second square flat structure are equal, and both being the first buoyancy length.
[0010] Preferably, the first float length is 2 and the second float length is 4. With this setting, the circulation unit of the first variable square flat weave is larger, which can evenly distribute external stress to more yarns, reduce local stress concentration, reduce yarn performance loss, and help maintain the original strength of the yarn.
[0011] Preferably, the first variable square flat organization uses 8 columns and 8 paths as the minimum cycle unit, wherein:
[0012] In the first column, columns 1, 2, and 3 are longitude buoys, and columns 4, 5, 6, 7, and 8 are latitude buoys;
[0013] In the second column, columns 1, 2, and 4 are longitude buoys, and columns 3, 5, 6, 7, and 8 are latitude buoys;
[0014] In the third column, columns 1, 3, and 4 are longitude buoys, and columns 2, 5, 6, 7, and 8 are latitude buoys;
[0015] In the fourth column, the second, third, and fourth columns are longitude buoys, and the first, fifth, sixth, seventh, and eighth columns are latitude buoys.
[0016] In the 5th column, the 6th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 5th columns are latitude buoys;
[0017] In the 6th column, the 5th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 6th columns are latitude buoys;
[0018] In the 7th column, the 5th, 6th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 7th columns are latitude buoys;
[0019] In the 8th column, the 5th, 6th, and 7th columns are longitude buoys, while the 1st, 2nd, 3rd, 4th, and 8th columns are latitude buoys.
[0020] Preferably, both the first and second square flat structures use 4 longitudinal rows and 4 paths as the minimum cycle unit, wherein:
[0021] In the first and second columns, the first and second lines are latitude buoys, and the third and fourth lines are longitude buoys;
[0022] In the 3rd and 4th columns, the 1st and 2nd columns are longitude buoys, and the 3rd and 4th columns are latitude buoys.
[0023] Preferably, the transitional structure is a double-layer plain weave joint structure.
[0024] Preferably, the width of the fabric edge sealing structure is 3-10mm. Because the fabric edge sealing structure is composed of three different structures with different shrinkage rates, in order to ensure the flatness of the fabric surface, after on-site experiments and weaving, a fabric edge sealing structure width of 3-10mm is most suitable.
[0025] This utility model also discloses a one-piece molded airbag, which includes an outer single-layer structure, an airbag inner cavity fabric structure, and the aforementioned fabric edge sealing structure. The airbag inner cavity fabric structure is sealed by the fabric edge sealing structure to form the airbag body, and the outer single-layer structure wraps around the outside of the airbag body.
[0026] This novel one-piece molded airbag boasts a high safety factor. The principle is as follows: When gas enters the airbag through the inflation port and rapidly spreads to fill the inner cavity, the inner sealing layer is first impacted by the airflow. This tightly woven first square plain weave is stretched and bent by the airflow, thus resisting the impact energy. Secondly, the outer sealing layer, primarily a first variable square plain weave, due to its structural characteristics (longer float length and increased weft points), both releases air and blocks the pressure generated by the airflow, effectively diverting the flow and resisting its impact to prevent breakage. This allows it to withstand high air pressure and prevent rupture. The air pressure of this novel one-piece molded airbag can reach over 45 kPa.
[0027] Preferably, the fabric structure of the airbag cavity is a double-layer plain weave.
[0028] Preferably, the outer single-layer structure, the inner fabric structure of the airbag cavity, and the fabric sealing structure are all made of nylon or polyester. This arrangement ensures that the airbag can withstand strong air pressure. Attached Figure Description
[0029] Figure 1 This is a partial schematic diagram of a one-piece molded airbag.
[0030] Figure 2 for Figure 1 Enlarged schematic diagram of part A in the middle.
[0031] Figure 3 for Figure 1 Enlarged schematic diagram of section B.
[0032] Figure 4 This is a diagram showing the tissue structure of the fabric within the airbag cavity.
[0033] Figure 5 This is an organizational chart for a transitional organization.
[0034] Figure 6 This is an organizational chart of the first-level flat organization and the second-level flat organization.
[0035] Figure 7 This is an organizational chart of the first variation of the flat organization.
[0036] Figure 8 This is a schematic diagram of the structure of the first variation of the planar tissue.
[0037] Note: Figure 8 The circle represents the warp yarn, and the line represents the weft yarn.
[0038] Explanation of symbols for main components:
[0039] 1. Outer single-layer structure, 2. Inner fabric structure of the airbag cavity, 3. Fabric edge sealing structure, 4. Inner edge sealing structure, 5. Transition structure, 6. First variation square flat structure, 7. Second square flat structure. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0041] like Figure 1-8 As shown, this utility model discloses a one-piece molded airbag, which includes an outer single-layer structure 1, an inner airbag fabric structure 2, and a fabric edge-sealing structure 3. The inner airbag fabric structure 2 is sealed by the fabric edge-sealing structure 3 to form the airbag body. The outer single-layer structure 1 wraps around the outside of the airbag body. The outer single-layer structure 1, the inner airbag fabric structure 2, and the fabric edge-sealing structure 3 are all made of nylon or polyester to ensure that the airbag body can withstand strong air pressure. The inner airbag fabric structure 2 can adopt a double-layer plain weave structure, which is also the most common double-layer plain weave structure in existing airbags. Double-layer plain weave structure is existing technology and can be used in various ways, such as... Figure 4 The tissue structure diagram shown. The outer single-layer tissue 1 can be constructed as follows: Figure 5 The double-layer plain weave joint structure is shown.
[0042] The pressure-holding performance of the airbag largely depends on the fabric edge-sealing structure 3. To improve the pressure-holding performance of the airbag, the fabric edge-sealing structure 3 is designed as follows: it includes an inner edge-sealing structure 4, a transition structure 5, and an outer edge-sealing structure. The transition structure 5 is located between the inner edge-sealing structure 4 and the outer edge-sealing structure. The transition structure 5 is a double-layer plain weave joint structure. The double-layer plain weave joint structure is existing technology and can be used as follows: Figure 5 The organizational structure is shown. The edges of the fabric typically include straight edges and corner edges. In this case, the fabric refers to the fabric structure 2 inside the airbag cavity. In addition, as can be seen from the structure of the airbag, the edges of its fabric are mainly straight edges.
[0043] The inner edge-sealing structure 4 is a first plain weave structure formed by alternating interlacing of warp and weft yarns with the same first float length. For the outer edge-sealing structure, at the straight edges of the fabric, it is a first varied plain weave structure 6 formed by alternating interlacing of warp and weft yarns, while at the corner edges of the fabric, it is a second plain weave structure 7 formed by alternating interlacing of warp and weft yarns. The warp and weft float lengths of the first varied plain weave structure 6 are both greater than the first float length, while the warp and weft float lengths of the second plain weave structure 7 are less than or equal to the first float length. Preferably, the warp and weft float lengths of the first varied plain weave structure 6 are equal, both being the second float length, and the second float length is 4; the warp and weft float lengths of the second plain weave structure 7 are equal, both being the first float length, and the first float length is 2.
[0044] That is, the first and second square flat weaves 7 adopt the same weave structure, such as Figure 6 As shown, both the first and second square flat structures 7 use 4 columns and 4 paths as the minimum cycle unit, where:
[0045] In the first and second columns, the first and second lines are latitude buoys, and the third and fourth lines are longitude buoys;
[0046] In the 3rd and 4th columns, the 1st and 2nd columns are longitude buoys, and the 3rd and 4th columns are latitude buoys.
[0047] like Figure 7-8 As shown, the first variation of the flat organization 6 uses 8 columns and 8 paths as the smallest loop unit, where:
[0048] In the first column, columns 1, 2, and 3 are longitude buoys, and columns 4, 5, 6, 7, and 8 are latitude buoys;
[0049] In the second column, columns 1, 2, and 4 are longitude buoys, and columns 3, 5, 6, 7, and 8 are latitude buoys;
[0050] In the third column, columns 1, 3, and 4 are longitude buoys, and columns 2, 5, 6, 7, and 8 are latitude buoys;
[0051] In the fourth column, the second, third, and fourth columns are longitude buoys, and the first, fifth, sixth, seventh, and eighth columns are latitude buoys.
[0052] In the 5th column, the 6th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 5th columns are latitude buoys;
[0053] In the 6th column, the 5th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 6th columns are latitude buoys;
[0054] In the 7th column, the 5th, 6th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 7th columns are latitude buoys;
[0055] In the 8th column, the 5th, 6th, and 7th columns are longitude buoys, while the 1st, 2nd, 3rd, 4th, and 8th columns are latitude buoys.
[0056] During the weaving process, because the outer layer of the edge-sealing structure 3 is mainly composed of the first variation plain weave 6, which has a longer float and increased weft points, the edge-sealing structure, combined with the first plain weave, will achieve tension balance. Under the same weaving conditions, the tension is relatively small, the fabric is flat, and the strength is relatively high. This can effectively improve tension uniformity, enhance fabric quality, and provide excellent weavability.
[0057] In addition, the first-square flat weave reduces the relative flatness and interlacing points, which reduces damage to the yarn during the weaving process, thus reducing fabric quality issues. It can also significantly improve the breaking strength of the fabric and enhance its overall physical properties.
[0058] Because the edge-sealing structure 3 of the fabric contains three different weave structures with varying shrinkage rates, it can result in an uneven fabric surface. Therefore, there are requirements regarding the width of the edge-sealing structure 3. Through on-site experiments and weaving, a width of 3-10mm for the edge-sealing structure 3 is found to be most suitable.
[0059] This novel airbag has excellent inflation performance and can prevent puncture failure. Specifically, when a car is involved in a collision, the airbag installed inside the vehicle ignites its generator to produce gas. The gas flow enters the airbag's inner cavity through the inflation port and rapidly diffuses outwards, instantly filling the airbag's inner cavity. At this time, the inner sealing edge structure 4 of the airbag's inner cavity is first impacted by the airflow. The inner sealing edge structure 4 is a tightly woven first square plain weave, which will be stretched and bent by the airflow impact to resist the impact energy generated by the airflow. The outer sealing edge structure is mainly a first modified square plain weave 6. Due to its organizational characteristics (longer floats and increased weft points), it both releases air and blocks the pressure generated by the airflow, which is equivalent to diverting the flow. Therefore, it can effectively resist the impact of the airflow and prevent the sealing edge structure from breaking. In this way, the airbag of this novel invention can withstand a large amount of air pressure and prevent rupture; in addition, it has high tensile strength, with nylon reaching over 1800N and polyester reaching over 1700N, enabling it to withstand strong air pressure.
[0060] By designing the outer edge sealing structure located at the straight edge of the fabric as a first variable square plain weave 6, denser interlacing points can be formed, significantly improving the fabric density. The outer edge sealing structure located at the corner edge of the fabric is designed as a second square plain weave 7, and the warp float and weft float of the first variable square plain weave 6 are both greater than the warp float and weft float of the second square plain weave 7, preferably twice as much. This can effectively prevent the outer edge sealing structure from circulating too long at the corner edge of the fabric, affecting the smoothness of the corner, thereby avoiding the risk of gas penetration at the corner position, and improving the pressure holding effect.
[0061] The following verification is demonstrated through two specific embodiments:
[0062] Example 1
[0063] This embodiment uses PET yarn with a specification of 550 dtex and a fabric density of 220*185 threads / 10cm. A one-piece airbag is woven using a jacquard air-jet loom, with an inner cavity edge sealing width of 8mm. The woven airbag is washed and then coated with silicone, with a basis weight of 55g / m². 2 The performance indicators of Example 1 are shown in Table 1. As can be seen from Table 1, the tensile strength of the sealing structure can reach over 1700N, and the air permeability is about 0.3L / dm² / min. This ensures that the airbag will not rupture due to being filled with gas at the moment of impact, thus guaranteeing the safety of the airbag. In addition, the air permeability is not too low (i.e., too airtight), which would be detrimental to release, while too high an air permeability would easily lead to air leakage, which would be detrimental to the deployment of the airbag.
[0064] In addition, during the airbag inflation test, the air pressure can reach about 45 kPa, which can also ensure the protection of the human body in the event of an airbag collision.
[0065] Example 2
[0066] This embodiment uses PA66 yarn with a specification of 470 dtex and a fabric density of 220*195 threads / 10cm. A one-piece airbag is woven using a jacquard air-jet loom, with an inner cavity edge sealing width of 8mm. The woven airbag is washed and then coated with silicone, with a basis weight of 55g / m². 2 The performance indicators of Example 2 are shown in Table 1. The yarn type and density of the fabric in this example are different from those in Example 1. Another difference is that it has higher air permeability, higher tensile strength, and an air pressure above 47 kPa.
[0067] Table 1
[0068]
[0069] In summary, the airbag using the fabric sealing structure 3 of this utility model has a very good effect on improving the pressure holding performance of the airbag, which is basically above 45kPa. It can effectively prevent detonation failure and also has high tensile strength.
[0070] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.
Claims
1. A fabric edge-sealing structure, wherein the fabric edge includes a straight edge and a corner edge, characterized in that: It includes an inner edge sealing structure, a transition structure, and an outer edge sealing structure, wherein the transition structure is located between the inner edge sealing structure and the outer edge sealing structure; The inner sealing structure is a first square plain structure formed by the warp and weft yarns interlacing with the same first float length; The outer edge sealing structure is a first variable square plain structure formed by alternating interlacing of warp and weft yarns at the straight edge of the fabric; while the outer edge sealing structure is a second square plain structure formed by alternating interlacing of warp and weft yarns at the corner edge of the fabric; the warp float length and weft float length of the first variable square plain structure are both greater than the first float length, and the warp float length and weft float length of the second square plain structure are less than or equal to the first float length.
2. The fabric edge-sealing structure as described in claim 1, characterized in that: In the first variation of the square flat structure, the warp and weft buoyancy lengths are equal, both being the second buoyancy length; in the second square flat structure, the warp and weft buoyancy lengths are equal, and both being the first buoyancy length.
3. The fabric edge-sealing structure as described in claim 2, characterized in that: The first buoyancy length is 2, and the second buoyancy length is 4.
4. The fabric edge-sealing structure as described in claim 1, characterized in that: The first variation of the flat organization uses 8 columns and 8 paths as the minimum loop unit, wherein: In the first column, columns 1, 2, and 3 are longitude buoys, and columns 4, 5, 6, 7, and 8 are latitude buoys; In the second column, columns 1, 2, and 4 are longitude buoys, and columns 3, 5, 6, 7, and 8 are latitude buoys; In the third column, columns 1, 3, and 4 are longitude buoys, and columns 2, 5, 6, 7, and 8 are latitude buoys; In the fourth column, the second, third, and fourth columns are longitude buoys, and the first, fifth, sixth, seventh, and eighth columns are latitude buoys. In the 5th column, the 6th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 5th columns are latitude buoys; In the 6th column, the 5th, 7th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 6th columns are latitude buoys; In the 7th column, the 5th, 6th, and 8th columns are longitude buoys, and the 1st, 2nd, 3rd, 4th, and 7th columns are latitude buoys; In the 8th column, the 5th, 6th, and 7th columns are longitude buoys, while the 1st, 2nd, 3rd, 4th, and 8th columns are latitude buoys.
5. The fabric edge-sealing structure as described in claim 1, characterized in that: Both the first and second square flat structures use 4 columns and 4 paths as the minimum cycle unit, where: In the first and second columns, the first and second lines are latitude buoys, and the third and fourth lines are longitude buoys; In the 3rd and 4th columns, the 1st and 2nd columns are longitude buoys, and the 3rd and 4th columns are latitude buoys.
6. The fabric edge-sealing structure as described in claim 1, characterized in that: The transitional structure is a double-layer plain weave joint structure.
7. The fabric edge-sealing structure as described in claim 1, characterized in that: The width of the fabric edge sealing structure is 3-10mm.
8. A one-piece molded airbag, characterized in that: It includes an outer single-layer structure, an inner fabric structure of the airbag cavity, and a fabric sealing structure as described in any one of claims 1-7, wherein the inner fabric structure of the airbag cavity is sealed to form a bladder body by the fabric sealing structure, and the outer single-layer structure is wrapped around the outside of the bladder body.
9. The one-piece molded airbag as described in claim 8, characterized in that: The fabric of the airbag cavity is a double-layer plain weave.
10. The one-piece molded airbag as described in claim 8, characterized in that: The outer single-layer structure, the inner fabric structure of the airbag cavity, and the fabric edge sealing structure are all made of nylon or polyester.