Webbing for vehicle safety belts and method of manufacturing the same

Abstract

The application aims to provide a kind of woven tape for vehicle safety belt and its manufacturing method, which is composed of tubular fabric. Wherein, the tubular fabric is mainly composed of first expansion part and second expansion part and the like arranged alternately in sequence along the length direction. And, the first expansion part and the second expansion part are formed by weft yarn with different negative Poisson's ratio effect and elasticity, and are formed into different volume expansion bodies after inflation by interweaving with warp yarn; the expansion coefficient of the first expansion part is greater than that of the second expansion part. Compared with the prior art, the application can improve its comfort and safety after inflation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of safety belts, in particular to a safety belt fabric for vehicle safety belts and a manufacturing method thereof. BACKGROUND

[0002] Automobile seat belt system is an important safety system facility for drivers and passengers, which can effectively reduce the damage to the personnel in the event of an accident. The existing automobile safety belt fabric is mainly woven by nylon or polyester material, which has smooth surface and high strength. In addition to meeting the requirement of effectively restraining the passengers under the action of large inertia, it should also have the characteristics of temperature resistance, light resistance and wear resistance. In addition, according to the standards related to safety belts, the elongation and energy absorption performance of the fabric also need to meet certain requirements.

[0003] However, the existing safety belt has the following problems in actual use: (1) poor comfort, due to the characteristics of the material, the body of the passenger, especially the chest, will be subjected to a large amount of pressure after wearing; (2) poor restraint, as the safety belt mainly protects the chest and abdomen of the passenger, when subjected to a large impact speed, the passenger will slide along the seat and the safety belt, causing injury; (3) in order to meet the requirement of elongation of the fabric, the strength of the fabric is high, which is easy to cause injury to the passenger.

[0004] In order to improve the comfort and safety of the safety belt, Ford Company first introduced an inflatable safety belt, which combines the traditional safety belt with the airbag, the cylindrical airbag extends from the buckle to fix the shoulder, and a safety belt airbag is filled inside. When a collision occurs, the airbag will penetrate the safety belt and spread the impact pressure to an area 5 times the size of the safety belt, so as to better fix the passenger and reduce the pressure on the chest. After that, many companies and individuals have researched on inflatable safety belts, but most of the solutions are similar to the solution of the airbag for the car, the structure of the fabric of the safety belt is the same as that of the airbag, although the safety of the safety belt is improved, but there are still problems such as poor comfort, easy to slip off during use, secondary injury after inflation explosion, etc. In addition, some companies directly use the method of inflating the fabric to generate inflatable safety belts, as disclosed in patent application files CN102985295B and CN110481489A, but there are still problems such as poor comfort, easy to slip off during use, secondary injury after inflation explosion, etc.

[0005] Therefore, how to provide a safety belt fabric for vehicle safety belts and a manufacturing method thereof to improve the comfort and safety after inflation is a technical problem that needs to be solved by the present application. SUMMARY

[0006] In view of the above-mentioned defects or shortcomings of the prior art, the technical problem to be solved by the present application is to provide a woven tape for a vehicle safety belt and a manufacturing method thereof, so as to improve the comfort and safety after inflation.

[0007] To solve the above-mentioned technical problem, the present application provides a woven tape for a vehicle safety belt, comprising:

[0008] a tubular fabric;

[0009] wherein the tubular fabric comprises: first expansion parts and second expansion parts arranged alternately and cyclically along the length direction thereof;

[0010] and the first expansion parts and the second expansion parts are formed by weft yarns with different negative Poisson's ratio effect and elasticity, and are interwoven with warp yarns to form expansion bodies with different volumes after inflation, respectively;

[0011] the expansion coefficient of the first expansion parts is greater than the expansion coefficient of the second expansion parts.

[0012] Further preferably, the weft yarns comprise: a core yarn, a blended fiber yarn for wrapping the core yarn, and an outer wrapping fiber yarn for wrapping the blended fiber yarn; wherein the breaking elongation of the outer wrapping fiber yarn, the blended fiber yarn and the core yarn decreases in turn.

[0013] Further preferably, the blended fiber yarn is a negative Poisson's ratio yarn; the blended fiber yarn is composed of at least two different modulus fibers, wherein one fiber has a modulus greater than 150 cN / dtex and is a hollow fiber, and the other fiber has a modulus less than 80 cN / dtex.

[0014] Further preferably, the blending ratio of the blended fiber yarn changes according to the rule of from large to small, and then from small to large; and the change of the elongation multiple of the core yarn is synchronized with the change of the blending ratio of the cow horn fiber and the polyester fiber.

[0015] Further preferably, the blending ratio of the blended fiber yarn changes periodically, and the blended fiber yarn at least comprises: a first blended yarn segment spun at a preset first blending ratio and used for weaving the constant area of the first expansion part; and a second blended yarn segment spun at a preset second blending ratio and used for weaving the constant area of the second expansion part, wherein the first blending ratio is greater than the second blending ratio.

[0016] a third blended yarn segment spun in a manner of gradually decreasing from the first blending ratio to the second blending ratio and used for weaving the transition area of the first expansion part.

[0017] And, the fourth blended yarn section is used for weaving the transition zone of the second expansion section, and the blending ratio gradually increases from the second blending ratio to the first blending ratio.

[0018] Further preferably, the first blending ratio is 90-80:10-20, the blended length of the first blended yarn section is 260-450 cm, and the elongation of the core yarn contained therein is 3-3.5 times; the second blending ratio is 40-50:60-50, and the blended length thereof is 130-225 cm, and the elongation of the core yarn contained therein is 1.5-2 times;

[0019] And, in the third blended yarn section, the blending ratio gradually decreases from the first blending ratio to 40-50:60-50, the blended length thereof is 12-15 cm, and the elongation of the core yarn contained therein gradually decreases to 1.5-2 times; in the fourth blended yarn section, the blending ratio gradually increases from the second blending ratio to 90-80:10-20, the blended length thereof is 12-15 cm, and the elongation of the core yarn gradually increases to 3-3.5 times.

[0020] Further preferably, the blended fiber yarn is composed of calamus draco and polyester fiber; the core yarn is spandex filament; and the outer wrapping fiber yarn is viscose filament; wherein the fineness of the spandex filament is 30-50D; the count of the calamus draco and polyester fiber is 5-10 English, the twist is 350-450 twists / m, and the twist direction is Z twist; the fineness of the viscose filament is 20-25D, the wrapping twist is 200-300 twists / m, and the wrapping twist direction is S twist; the modulus of the calamus draco is 150-190 cN / dtex, and the modulus of the polyester fiber is 70-80 cN / dtex.

[0021] Further preferably, the inflation port is located at the middle position of the woven tape; there are at least two inflation ports, and the inflation ports are arranged on opposite sides of the woven tape; the width of the inflation port is 4-5 mm; the warp density of the woven tape is 280-290 per 10 cm, and the weft density is 55-60 per 10 cm; the fabric weave of the woven tape is plain weave; the warp yarn of the woven tape is polyester filament, the fineness of the polyester filament is 1600 dtex-1700 dtex; and the number of holes of the polyester filament is 96f-144f.

[0022] Further preferably, the tubular fabric is formed by the first layer and the second layer, and at least part of the area is not enclosed to form the inflation port; the woven tape is flat and strip-shaped before inflation and expansion; the length of the first expansion section is 40-50 mm, and the length of the second expansion section is 20-25 mm.

[0023] The application also provides a manufacturing method of the belt for vehicle safety belt, for preparing the belt for vehicle safety belt, comprising the following steps:

[0024] Preparation of weft yarns with different expansion coefficients;

[0025] According to the length ratio and alternating change rule between the first expansion part and the second expansion part, the weft yarns with different expansion coefficients are interwoven with the warp yarns respectively to form the first expansion part and the second expansion part.

[0026] The belt for vehicle safety belt and the manufacturing method thereof can improve the comfort and safety after inflation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0028] Figure 1 : The structure of the vehicle safety belt after unfolding along the longitudinal direction in the first embodiment of the application;

[0029] Figure 2 : The state of the belt for vehicle safety belt after inflation in the first embodiment of the application;

[0030] Figure 3 : The structure of the different mixed sections of the weft yarns in the first embodiment of the application;

[0031] Figure 4 : The structure of the weft yarns in the first embodiment of the application;

[0032] Figure 5 : The cross-sectional structure of the middle region of the vehicle safety belt after inflation in the first embodiment of the application;

[0033] Figure 6 : The state of the belt for vehicle safety belt after inflation in the second embodiment of the application;

[0034] Figure 7 : The structure of the vehicle safety belt after unfolding along the longitudinal direction in the second embodiment of the application;

[0035] Figure 8 : The manufacturing flow chart of the belt for vehicle safety belt in the third embodiment of the application;

[0036] Figure 9 : The manufacturing flow chart of the belt for vehicle safety belt in the fourth embodiment of the application;

[0037] Figure 10 : Figure 9 the specific flow chart of step S21;

[0038] Reference numerals: 1 - first layer; 2 - second layer; 3 - tubular fabric; 4 - air inflation pipe; 5 - air inflation pipe; 6 - first expansion part; 61 - constant zone; 62 - transition zone; 7 - second expansion part; 71 - constant zone; 72 - transition zone; 8 - binding yarn; 1a - first layer; 2a - second layer; 3a - tubular fabric; 4a - air inflation pipe; 5a - air inflation pipe; 6a - first expansion part; 7a - second expansion part; 8a - binding yarn; 9 - weft yarn; 91 - core yarn; 92 - mixed fiber yarn; 93 - outer wrapping fiber yarn; 921 - polyester fiber; 922 - luffa fiber. DETAILED DESCRIPTION

[0039] The concept, specific structure and resulting technical effects of the present application will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present application.

[0040] Example 1

[0041] The present embodiment provides a kind of for vehicle safety belt's belt, can be applied to car safety seat, as shown in Fig. Figures 1 to 5 It is composed of tubular fabric 3. Among them, tubular fabric 3 is mainly composed of first expansion part 6 and second expansion part 7 etc. which are alternately arranged in sequence along the length direction. And, first expansion part 6 and second expansion part 7 constitute a cycle unit during weaving, and weave in cycle. The expansion coefficient of the above-mentioned first expansion part 6 is greater than that of the second expansion part 7. And, the first expansion part 6 and the second expansion part 7 are respectively formed into different volume expansion bodies after inflation by flat belt.

[0042] And, tubular fabric 3 at least has part and is provided with air inflation port for connecting with external inflation device, as shown in Fig. Figure 2 When the air inflation port of tubular fabric 3 is connected with inflation device through air inflation pipe 4, and after inflation, tubular fabric 3 changes from flat belt to expansion state, and forms expansion part with different concave-convex.

[0043] From the above, in the tubular fabric 3 of the present embodiment, the first expansion section 6 and the second expansion section 7 having different expansion coefficients are arranged alternately and cyclically in the length direction of the tubular fabric 3. When the vehicle safety belt triggers the inflator to release gas due to a car collision, the tubular fabric 3 changes from a flat belt shape before inflation to an inflated state. Because the first expansion section 6 and the second expansion section 7 have different expansion coefficients, the tubular fabric 3 can produce a dilatancy effect, and the different parts of the vehicle safety belt have different inflated volumes and thicknesses after inflation, thereby producing different concave-convex regions. When the vehicle safety belt contacts the human body, it is not easy to roll and slip, thereby having good binding performance, and improving the comfort and safety of the vehicle safety belt after inflation.

[0044] Furthermore, because the weft yarn 9 of the tubular fabric 3 has a yarn with a regularly changing Poisson's ratio and elasticity, and the Poisson's ratio effect of the weft yarn 9 in the first expansion section 6 and the second expansion section 7 is different, when the tubular fabric 3 is inflated, the weft yarn 9 is subjected to a tensile load in the warp direction, and the weft yarn 9 perpendicular to the load direction has a negative Poisson's ratio effect and naturally produces different expansion deformations.

[0045] Specifically, when the weft yarn 9 has a yarn with a regularly changing Poisson's ratio and elasticity and is interwoven with the conventional warp yarn, the weft yarn 9 naturally forms expansion sections having different expansion coefficients, and when the weft yarn 9 is elongated under stress, it produces different dilatancy effects, and the diameter of the cross section of the yarn becomes larger, thereby filling the pores caused by the increase in the weft volume and ensuring that the safety belt does not leak after inflation. Furthermore, because the elasticity of the weft yarn 9 with different negative Poisson's ratio effects is also regularly changed, when subjected to the same gas pressure, the elongation rates of the regions woven by the weft yarn 9 with different negative Poisson's ratio effects are different, thereby making the inflated volumes of different parts of the vehicle safety belt inconsistent.

[0046] Further preferably, in order to control the area and width of the concave-convex regions, improve the binding performance of the vehicle safety belt during inflation, and ensure the comfort and safety of the vehicle safety belt, the length A of the first expansion section 6 is preferably 40-50 mm, and the length B of the second expansion section 7 is preferably 20-25 mm.

[0047] Further preferably, in order to facilitate the design and preparation requirements in practical applications, the tubular fabric 3 can be formed by weaving a tubular fabric with an inflatable cavity, or can be formed by surrounding the first layer 1 and the second layer 2, and at least part of the area is not surrounded to form an inflation port, and the surrounded part is connected by the binding yarn 8 to form a tubular fabric, and the present embodiment is only used as an example for illustration. The inflation port is preferably located at the middle position of the tubular fabric to improve the inflation efficiency, so that the vehicle safety belt can be filled as soon as possible. Obviously, it needs to be pointed out that the inflation port in the present embodiment can be opened at the head end or tail end of the vehicle safety belt. And the binding yarn 8 in the present embodiment can preferably adopt the same structure as the warp yarn to connect the selvedge of the first layer 1 and the second layer 2.

[0048] Further preferably, as shown in Figure 4 The weft yarn 9 includes a core yarn 91, a mixed fiber yarn 92 for wrapping the core yarn 91, and an outer wrapping fiber yarn 93, etc. The breaking elongation of the outer wrapping fiber yarn 93, the mixed fiber yarn 92 and the core yarn 91 decreases in turn. The weft yarn 9 has a regular change in Poisson's ratio and a negative Poisson's ratio effect. The mixed fiber yarn 92 is preferably composed of two different modulus fibers, and the high modulus fiber is a hollow fiber.

[0049] Since the breaking elongation of the outer wrapping fiber yarn 93, the mixed fiber yarn 92 and the core yarn 91 decreases in turn, when the yarn is stretched, the outer wrapping fiber yarn 93 breaks first, and then the mixed fiber yarn 92 wrapped by the outer wrapping fiber yarn 93 is released from the constraint. Since the mixed fiber yarn 92 is composed of two fibers with different moduli, the twist of the mixed fiber yarn 92 is small after untwisting, and the high modulus hollow fiber, such as the calotropis fiber 922, expands during the untwisting process, thereby showing a significant negative Poisson's ratio effect.

[0050] Further preferably, the mixed fiber yarn 92 is only composed of two different modulus fibers as an example for illustration, wherein the high modulus fiber is a hollow fiber with a modulus greater than 150 cN / dtex, and the modulus of the other fiber is less than 80 cN / dtex, so as to improve the expansion ratio of the mixed fiber yarn 92 during straightening and untwisting, thereby making the formed negative Poisson's ratio effect more significant.

[0051] Further preferably, the high modulus fiber in the mixed fiber yarn 92 is preferably a calotropis fiber 922, and the low modulus fiber is preferably a polyester fiber 921.

[0052] Further preferably, the blending ratio in the blended fiber changes according to the rule of from large to small and from small to large. The elongation of the core yarn 91 changes synchronously with the change of the blending ratio of the Gynospadix Fiber 922 and the Polyester Fiber 921. Since the blending ratio in the blended fiber changes periodically according to the rule of from large to small and from small to large, the force applied to the vehicle safety belt during the inflation process changes periodically, so that the local area is prevented from being damaged due to the large force or the large gap caused by the air leakage, which affects the protection performance of the vehicle safety belt after the inflation.

[0053] Further preferably, as shown in Figure 1 and Figure 3 , the blending ratio in the blended fiber yarn 92 changes periodically, and the blended fiber yarn 92 at least includes: a first blended yarn section that is spun according to a preset first blending ratio and is used to weave the constant area 61 of the first inflation part 6; a second blended yarn section that is spun according to a preset second blending ratio and is used to weave the constant area 71 of the second inflation part 7, wherein the first blending ratio is greater than the second blending ratio; a third blended yarn section that is spun according to the rule of gradually decreasing from the first blending ratio to the second blending ratio and is used to weave the transition area 62 of the first inflation part 6; and a fourth blended yarn section that is spun according to the rule of gradually increasing from the second blending ratio to the first blending ratio and is used to weave the transition area 72 of the second inflation part 7.

[0054] Further preferably, as shown in Figure 3 , the blended fiber yarn 92 is blended according to the first blended yarn section (blended section I), the third blended yarn section (blended section III), the second blended yarn section (blended section II), and the fourth blended yarn section (blended section IV) as one blending cycle, so that the blended fiber yarn 92 woven by one blending cycle can make the weft yarn 9 woven only once interweave the weft yarn 9 in different sections with the warp yarn in the corresponding inflation part, that is, form the inflation parts with different inflation coefficients, thereby improving the weaving efficiency and reducing the cost. Moreover, the blended fiber yarn 92 in the embodiment can also make the weft force along the length direction of the woven belt change periodically during the inflation, so as to avoid the local damage caused by the sudden change of the force and the injury to the human body.

[0055] Further preferably, in the first blended yarn section, the blending ratio of the Gynospadix Fiber 922 and the Polyester Fiber 921 is 90-80:10-20, and in the blended yarn section, the blending length of the blended fiber yarn 92 is 260-450 cm, and the elongation of the core yarn 91 covered by the blended fiber yarn 92 is 3-3.5 times.

[0056] In the second blending yarn section, the blending ratio of the calamus fibers 922 and the polyester fibers 921 is gradually decreased from 40-50:60-50, and a blending section III is formed, the length of the blended fiber yarn 92 is 130-225 cm, and the elongation multiple of the core yarn 91 is gradually decreased to 1.5-2 times.

[0057] Further preferably, in the third blending yarn section, the blending ratio of the calamus fibers 922 and the polyester fibers 921 is gradually decreased from 40-50:60-50, and a blending section II is formed, the blending length of the blended fiber yarn 92 is 12-15 cm, and the elongation multiple of the core yarn 91 is gradually decreased to 1.5-2 times. In the fourth blending yarn section, the blending ratio of the calamus fibers 922 and the polyester fibers 921 is gradually increased from 90-80:10-20, and a blending section IV is formed, the length of the blended fiber yarn 92 is 12-15 cm, and the elongation multiple of the core yarn 91 is gradually increased to 3-3.5 times.

[0058] Through the above parameter settings, when each expansion portion is expanded under stress, the core yarn 91, the outer wrapped blended fiber, and the outer wrapped fiber yarn 93 can change according to the preset state, which maximally avoids the phenomenon that the outer wrapped fiber yarn 93 in some areas is not broken, the blended fiber yarn 92 is broken, or the core yarn 91 is broken, so as to cause the impact force of the periodic change transmission to be interrupted, and the normal use and safety protection of the entire vehicle safety belt cannot be achieved. Moreover, after the weft yarn 9 with the constant blending ratio is interwoven with the conventional yarn and the tubular fabric is inflated, a flat area with a specific width and being respectively a convex portion and a concave portion can be formed, and the weft yarn 9 with the changing blending ratio is interwoven with the conventional yarn to form a transition area with an arc-shaped transition, so as to reduce the pressure of the convex portion on the human body.

[0059] Further preferably, the core yarn 91 is a spandex filament. The outer wrapped fiber yarn 93 is a viscose filament. Since the outer wrapped filament is a viscose filament with low elasticity, low elongation, and low strength, when the yarn is stretched, the viscose filament is broken, and the core yarn portion compressed by the viscose filament wrapping is released from the restraint. Since the blended fiber yarn 92 in the core yarn portion is composed of the blended polyester fibers 921 and calamus fibers 922, the modulus of the calamus fibers 922 is high, and the calamus fibers 922 are hollow fibers, the twist of the core yarn portion is small after untwisting, and thus the calamus fibers 922 in the core yarn portion are expanded, thereby showing a negative Poisson's ratio effect.

[0060] Through the structure, the outer wrapping fiber yarn 93 can protect the outer wrapping mixed fiber and the core yarn 91 in the initial state when the safety belt of the vehicle is not inflated, and after inflation, the mixed fiber yarn 92 changes from the spiral state to the straight state by the breakage of the outer wrapping fiber yarn 93. Moreover, since the elasticity of the outer wrapping fiber yarn 93, the mixed fiber yarn 92 and the core yarn 91 increases in turn, and the breaking strength decreases in turn, the core yarn 91 changes from the straight state to the spiral state due to the spiral extrusion of the rigid mixed fiber yarn 92, so that the diameter of the yarn body increases, thereby forming a good negative Poisson's ratio effect, i.e. the dilatancy effect.

[0061] Further preferably, the spandex filament has a fineness of 30-50D. The gourd fiber 922, the polyester fiber 921 and the spandex filament have a count of 5-10 English, a twist of 350-450 twists / m, and a twist direction of Z twist. The viscose filament has a fineness of 20-25D, a wrapped twist of 200-300 twists / m, and a wrapped twist direction of S twist. The modulus of the gourd fiber 922 is 150-190 cN / dtex, and the modulus of the polyester fiber 921 is 70-80 cN / dtex.

[0062] Further preferably, the inflation port is preferably located on the first inflation portion. The inflation port is at least two, and the inflation port is connected with the inflation pipe 4 and the inflation pipe 5 shown in Figure 2 respectively, and the inflation port is arranged on the opposite sides of the braid.

[0063] The width of the inflation port is 4-5mm. The warp density of the braid is 280-290 ends / 10cm, and the weft density is 55-60 ends / 10cm. The warp yarn of the braid is a polyester filament, and the fineness of the polyester filament is 1600dtex-1700dtex. The number of holes of the polyester filament is 96f-144f.

[0064] Further preferably, the fabric organization of the braid is any one or a combination of plain weave, twill or satin, and the embodiment is only described by taking the plain weave structure as an example.

[0065] In addition, it is worth mentioning that the inflation device can be a safety airbag, or a common inflation machine with the safety airbag or an independent inflation machine, etc.

[0066] Example Two

[0067] The embodiment provides a kind of for vehicle safety belt's belt, which is made of tubular fabric 3a.Therein, tubular fabric 3a is mainly by the first expansion part 6a and the second expansion part 7a etc. that are sequentially arranged in length direction of it are alternately circulated in sequence.Construction, the first expansion part 6a and the second expansion part 7a constitute a cycle unit, and are circulated weaving in the process of weaving.Meanwhile, the expansion coefficient of the first expansion part 6a is greater than the expansion coefficient of the second expansion part 7a.And, the first expansion part 6a and the second expansion part 7a are respectively formed into different volume expansion bodies by flat band after inflation.

[0068] And, the tubular fabric 3a described above is at least partially provided with inflation port for connecting with external inflation device, reference Figure 2 As shown, when the inflation port of tubular fabric 3 is connected with inflation device through inflation pipe 4, and after inflation, tubular fabric 3 changes from flat band to expansion state, and forms expansion part with different concave-convex.

[0069] From the above, it can be seen that the first expansion part 6a and the second expansion part 7a with different expansion coefficients are sequentially arranged in length direction of the tubular fabric 3a in the embodiment, so that when the vehicle safety belt triggers the inflation device to release gas due to automobile collision, the tubular fabric 3a changes from flat band before inflation to inflation state during the change process, and because the expansion coefficients of the first expansion part 6a and the second expansion part 7a are different, the dilatancy effect can be generated, and the inflation volume and thickness of different parts of the vehicle safety belt are also inconsistent, so that different concave-convex areas can be generated, so that when it contacts with the human body, it is not easy to produce rolling and slip, and further has good binding property, and improves the comfort and safety after inflation of the prepared vehicle safety belt.

[0070] And, because the weft yarn of the tubular fabric 3a adopts the yarn with regular change of poisson's ratio and elasticity, and the poisson's ratio effect of the weft yarn in the first expansion part 6a and the second expansion part 7a is different, when the tubular fabric 3a is inflated, the weft yarn is subjected to tensile load in the warp direction, the weft yarn perpendicular to the load direction has negative poisson's ratio effect, and different expansion deformation is naturally generated.

[0071] Specifically, when the yarn with regular variation of Poisson's ratio and elasticity is used as weft yarn, and is interwoven with conventional warp yarn, the expansion part with different expansion coefficients can be naturally formed, and the weft yarn can produce different auxetic effect when it is elongated under stress, so that the diameter of the yarn cross section becomes thick, thereby filling the pores caused by the increase of weft volume, and ensuring that the safety belt does not leak after inflation. Moreover, due to the regular variation of the elasticity of the weft yarn with different negative Poisson's ratio effect, when subjected to the same gas pressure, the elongation rate of the area part woven by the weft yarn with different negative Poisson's ratio effect is different, so that the inflation volume of different parts of the vehicle safety belt is also different.

[0072] Further preferably, in order to control the area and width of the concave-convex area, and improve the binding property of the vehicle safety belt during the inflation process, while ensuring its comfort and safety, the length A of the first expansion part 6a is preferably 40-50 mm, and the length B of the second expansion part 7a is preferably 20-25 mm.

[0073] Further preferably, in order to facilitate the design and preparation requirements in actual application, the tubular fabric 3a can be formed by the first layer 1a and the second layer 2a, and at least part of the area is not enclosed to form an inflation port, and the enclosed part is connected by the binding yarn 8a. Preferably, the inflation port is located at the middle position of the belt to improve the inflation efficiency, so that the vehicle safety belt can be filled as soon as possible. Obviously, it needs to be pointed out that the inflation port in the embodiment can be opened at the head end or tail end of the vehicle safety belt.

[0074] Further preferably, in order to control the area and width of the concave-convex area, and improve the binding property of the vehicle safety belt during the inflation process, while ensuring its comfort and safety, the length A of the first expansion part 6a is preferably 40-50 mm, and the length B of the second expansion part 7a is preferably 20-25 mm.

[0075] Further preferably, the weft yarn includes core yarn, mixed fiber yarn for wrapping the core yarn, and outer wrapping fiber yarn for wrapping the mixed yarn, etc. The breaking elongation of the outer wrapping fiber yarn, the mixed fiber yarn and the core yarn decreases in turn. The weft yarn has regular variation of Poisson's ratio and negative Poisson's ratio effect. The mixed fiber yarn is composed of at least two different modulus fibers, and the high modulus fiber is a hollow fiber. It should be pointed out that the weft yarn in the embodiment adopts the same wrapping structure as the weft yarn in embodiment one, which will not be described in detail here.

[0076] Since the elongation at break of the outer wrapping fiber yarn, the mixed fiber yarn and the core yarn decreases in turn, when the yarn is stretched, the outer wrapping fiber yarn breaks first, then the mixed fiber yarn wrapped by the outer wrapping fiber yarn is released, and since the mixed fiber yarn is composed of two fibers with different modulus, the twist of the mixed fiber yarn is small after untwisting, and in the process of untwisting, the hollow fiber with high modulus, such as the luffa fiber, expands, thereby showing a significant negative Poisson's ratio effect.

[0077] Further preferably, the modulus of the hollow fiber is greater than 150 cN / dtex, and the modulus of the other fiber is less than 80 cN / dtex, so that the expansion ratio of the mixed fiber yarn in the process of straightening and untwisting can be improved, thereby forming a negative Poisson's ratio effect.

[0078] Further preferably, the mixed fiber yarn is a blended fiber composed of luffa fiber and polyester fiber. The blending ratio of the luffa fiber and the polyester fiber in the blended fiber changes according to the rule of from large to small and then from small to large. The elongation multiple of the core yarn changes synchronously with the change of the blending ratio of the luffa fiber and the polyester fiber.

[0079] Further preferably, at least part of the weft yarns for weaving the first expansion part 6a are first weft yarns, and at least part of the weft yarns for weaving the first expansion part 6a are second weft yarns, wherein the blending ratio of the mixed fiber yarn in the first weft yarn is a first blending ratio, and the blending ratio of the mixed fiber yarn in the second weft yarn is a second blending ratio. The first blending ratio is greater than the second blending ratio.

[0080] The weft yarns with different blending ratios are interwoven with the warp yarns in the corresponding expansion parts, so that the expansion parts with different expansion coefficients are formed, thereby improving the weaving efficiency and reducing the cost. Moreover, the mixed fiber yarn in the embodiment can make the tensile stress of the weft direction of the weft belt periodically change along the length direction of the weft belt when the weft belt is inflated, so as to avoid the local tensile stress of the weft belt suddenly changing and causing damage to the weft belt and the human body.

[0081] Further preferably, in the blended yarn section of the first weft yarn, the blending ratio of the luffa fiber and the polyester fiber is 90-80:10-20, and the elongation multiple of the core yarn wrapped by the blended yarn section is 3-3.5 times.

[0082] In the blended yarn section of the second weft yarn, the blending ratio of the luffa fiber and the polyester fiber is 40-50:60-50, and a blended yarn section III is formed. The length of the mixed fiber yarn is 130-225 cm, and the elongation multiple of the core yarn is 1.5-2 times.

[0083] Through the above parameter setting, the core yarn, the outer wrapping mixed fiber and the outer wrapping fiber yarn can change according to the preset state when each expansion part is expanded under stress, so as to avoid the phenomenon that the outer wrapping fiber yarn in some areas is not broken, the mixed fiber yarn is broken or the core yarn is broken, etc., so as to cause the impact force of periodic change transmission to be interrupted and the normal use and safety protection of the entire vehicle safety belt to be unable to be realized.

[0084] Further preferably, the core yarn is spandex filament. The outer wrapping fiber yarn is viscose filament. Since the outer wrapping filament is low-elastic, low-elongation and low-strength viscose filament, the viscose filament is broken after the yarn is stretched, and when the viscose filament is broken, the core yarn part compressed by the wrapping is released, and the mixed fiber yarn in the core yarn part is composed of polyester and snake gourd fiber, the modulus of the snake gourd fiber is high, and the snake gourd fiber is hollow fiber, and the twist of the core yarn is small after untwisting, so the snake gourd fiber in the core yarn part expands, thereby showing negative Poisson's ratio effect.

[0085] Through the structure, the outer wrapping fiber yarn can better protect the outer wrapping mixed fiber and the core yarn inside to keep the initial state when the vehicle safety belt is not inflated, and after inflation, the mixed fiber yarn changes from the spiral state to the straight state by breaking the outer wrapping fiber yarn. Moreover, since the elasticity of the outer wrapping fiber yarn, the mixed fiber yarn and the core yarn increases in turn, and the breaking strength decreases in turn, the core yarn changes from the straight state to the spiral state due to the spiral extrusion of the rigid mixed fiber yarn, so that the diameter of the yarn body increases, thereby forming good negative Poisson's ratio effect, i.e. auxetic effect.

[0086] Further preferably, the fineness of the spandex filament is 30-50D. The count of the snake gourd fiber, the polyester fiber and the spandex filament is 5-10 English, the twist is 350-450 twists / m, and the twist direction is Z twist. The fineness of the viscose filament is 20-25D, the wrapping twist is 200-300 twists / m, and the wrapping twist direction is S twist. The modulus of the snake gourd fiber is 150-190 cN / dtex, and the modulus of the polyester fiber is 70-80 cN / dtex.

[0087] Further preferably, the above inflation port is at least two, referring to the inflation pipe 4a and the inflation pipe 5a connected with the corresponding inflation port respectively as shown in Figure 2 , and the inflation port is arranged on the opposite sides of the braid respectively, and preferably located on the first expansion part.

[0088] The width of the above inflation port is 4-5mm. The warp density of the braid is 280-290 roots / 10cm, and the weft density is 55-60 roots / 10cm. The warp yarn of the braid is polyester filament, and the fineness of the polyester filament is 1600dtex-1700dtex. The number of holes of the polyester filament is 96f-144f.

[0089] Further preferably, the fabric weave of the above-mentioned webbing is any one or a combination of plain weave, twill or satin, and the present embodiment is described by way of example only with the fabric weave of the webbing being a plain weave structure.

[0090] Embodiment Three

[0091] The present embodiment also provides a manufacturing method for a webbing of a vehicle safety belt, for manufacturing the webbing of a vehicle safety belt as described in Embodiment One above, as shown in FIG. 1, comprising the following steps: Figure 8

[0092] Step S1, preparing weft yarns with different expansion coefficients.

[0093] Step S2, according to the length ratio and alternating change rule between the first expansion part 6 and the second expansion part 7, and the fabric shrinkage and the width of the webbing, the weft yarns with different expansion coefficients are interwoven with the warp yarns respectively to form the first expansion part 6 and the second expansion part 7.

[0094] In detail, the above-mentioned step S1 can specifically include the following steps:

[0095] The weft yarns of the mixed spinning sections with different expansion coefficients are prepared according to different blending ratios, and the blending ratios are spun according to the preset length. Moreover, the expansion coefficient is determined by the blending ratio in each mixed spinning section.

[0096] Moreover, step S2 can also specifically include the following steps:

[0097] According to the fabric shrinkage and the width of the webbing, the above-mentioned weft yarns are controlled to be interwoven with the warp yarns in sequence to form the alternating first expansion part 6 and the second expansion part 7, wherein the calculation formula of the fabric shrinkage is: the width of the webbing x 2 x the number of weft yarns in the region ÷ (1-weft shrinkage rate). Moreover, the first expansion part 6 and the second expansion part 7 are simultaneously formed in part of the first layer 1 and the second layer 2 when weaving, and are formed by the interweaving of the warp yarns constituting the binder yarn 8. Obviously, the first expansion part 6 and the second expansion part 7 in the present embodiment can also be formed without forming the first layer 1 and the second layer 2 respectively, but can be woven into a tubular structure of the expansion body at one time according to actual needs.

[0098] As can be seen from the above steps, the webbing of the vehicle safety belt can be woven according to the above steps, so that the inflated expansion volume and thickness of different parts of the vehicle safety belt are not consistent when inflated, thereby producing different concave-convex regions, so as to facilitate the contact with the human body without easy rolling and slipping, thereby having good binding performance, and further improving the comfort and safety of the prepared vehicle safety belt after inflation. ​

[0099] Embodiment Four

[0100] The embodiment also provides a manufacturing method of the belt for the vehicle safety belt, for manufacturing the belt for the vehicle safety belt as in the above embodiment two, as shown in the figure, comprising the following steps: Figure 9

[0101] Step S11, preparing weft yarns with different expansion coefficients.

[0102] Step S21, according to the length ratio between the first expansion part 6a and the second expansion part 7a, and the alternating change rule, the weft shrinkage of the belt and the width of the belt, the weft yarns with different expansion coefficients are respectively interwoven with the warp yarns to form the first expansion part 6a and the second expansion part 7a.

[0103] In detail, the above step S11 can specifically include the following steps:

[0104] Two weft yarns with different expansion coefficients of the blended section are prepared according to different blending ratios, that is, the first weft yarn for weaving the first expansion part 6a and the second weft yarn for weaving the first expansion part 6a.

[0105] And, as shown in the figure, step S21 specifically includes the following steps: Figure 10

[0106] Step S211: according to the length ratio of the first expansion part 6a and the second expansion part 7a, the weft shrinkage, and the fineness specification of the first weft yarn and the second weft yarn, the number of the first weft yarn and the second weft yarn is determined.

[0107] Step S212: the first weft yarn and the second weft yarn are respectively interwoven with the corresponding warp yarns to obtain the first expansion part 6a and the second expansion part 7a arranged alternately.

[0108] From the above steps, it can be seen that according to the above steps of circular weaving, the belt for the vehicle safety belt can make the inflated expansion volume and thickness of different parts of the vehicle safety belt not consistent when inflated, so as to produce different concave-convex areas, so as to not easy to produce rolling and slipping when contacting with the human body, thereby having good binding property, and further can improve the comfort and safety of the prepared vehicle safety belt after inflation.

[0109] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. The technical solutions of the present application have been described in detail only with reference to the preferred embodiments. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.​​

Claims

1. A webbing for a vehicle safety belt, characterized in that, comprises: a tubular fabric; wherein the tubular fabric comprises: first and second expansion portions arranged in an alternating cycle in sequence along the length direction thereof; and the first and second expansion portions are formed by weft yarns with different negative Poisson's ratio effect and elasticity, interwoven with warp yarns, and after inflation, respectively form flat belt-shaped expansion bodies with different volumes; the expansion coefficient of the first expansion portion is greater than that of the second expansion portion; the weft yarns comprise: a core yarn, a blended fiber yarn for wrapping the core yarn, and an outer wrapping fiber yarn for wrapping the blended fiber yarn; the blended fiber yarn is a negative Poisson's ratio yarn; the blended fiber yarn is composed of a mixture of snake gourd fibers and polyester fibers; the blending ratio in the blended fiber yarn changes periodically, the blending ratio in the blended fiber yarn is the blending ratio of the snake gourd fibers and the polyester fibers, which changes according to the rule of from large to small and then from small to large, and the blended fiber yarn at least includes: a first blended yarn segment spun at a preset first blending ratio and used for weaving a constant area of the first expansion portion; a second blended yarn segment spun at a preset second blending ratio and used for weaving a constant area of the second expansion portion, wherein the first blending ratio is greater than the second blending ratio; a third blended yarn segment spun in a manner of gradually decreasing from the first blending ratio to the second blending ratio and used for weaving a transition area of the first expansion portion; and a fourth blended yarn segment spun in a manner of gradually increasing from the second blending ratio to the first blending ratio and used for weaving a transition area of the second expansion portion; the core yarn is a spandex filament; and the outer wrapping fiber yarn is a viscose filament.

2. The webbing for a seat belt for a vehicle according to claim 1, wherein When the yarn is stretched, the outer wrapping fiber yarn breaks first, and then the blended fiber yarn wrapped by the outer wrapping fiber yarn is released.

3. The webbing for a vehicle safety belt according to claim 2, characterized in that, the blended fiber yarn is composed of a mixture of two different modulus fibers, wherein the modulus of the snake gourd fiber is 150-190 cN / dtex, and the snake gourd fiber is a hollow fiber; and the modulus of the polyester fiber is 70-80 cN / dtex.

4. The webbing for a vehicle safety belt according to claim 2, characterized in that, the elongation multiple of the core yarn changes synchronously with the change of the blending ratio.

5. The webbing for a vehicle safety belt according to claim 1, characterized in that, the first blending ratio is 90-80:10-20; the blended length of the first blended yarn segment is 260-450 cm, and the elongation multiple of the core yarn contained therein is 3-3.5 times; the second blending ratio is 40-50:60-50; and the blended length of the second blended yarn segment is 130-225 cm, and the elongation multiple of the core yarn contained therein is 1.5-2 times. And, in the third blended yarn section, the blending ratio gradually decreases from the first blending ratio to 40-50:60-50, the blending length is 12-15 cm, and the elongation of the core yarn gradually decreases to 1.5-2 times; in the fourth blended yarn section, the blending ratio gradually increases from the second blending ratio to 90-80:10-20, the blending length is 12-15 cm, and the elongation of the core yarn gradually increases to 3-3.5 times.

6. The webbing for a vehicle safety belt according to claim 1, wherein the spandex filament has a fineness of 30-50D; the calotropis procera fiber and the polyester fiber have a count of 5-10 English and a twist of 350-450 twists / m, and the twist direction is Z twist; the viscose filament has a fineness of 20-25D, and the wrapped twist has a twist of 200-300 twists / m and an S twist direction; the calotropis procera fiber has a modulus of 150-190 cN / dtex, and the polyester fiber has a modulus of 70-80 cN / dtex.

7. The webbing for a vehicle safety belt according to claim 1, wherein the tubular fabric is formed by a first layer and a second layer, and at least part of the area is not enclosed to form an inflation port for connecting with an external inflation device, so that the tubular fabric changes from a flat strip to an inflated shape after inflation; the inflation port is located at the middle position of the webbing; there are at least two inflation ports, and the inflation ports are arranged on opposite sides of the webbing; the width of the inflation port is 4-5 mm; the warp density of the webbing is 280-290 per 10 cm, and the weft density is 55-60 per 10 cm; the fabric organization of the webbing is plain weave; the warp yarn of the webbing is a polyester filament, the fineness of the polyester filament is 1600dtex-1700dtex, and the hole number of the polyester filament is 96f-144f.

8. The webbing for a vehicle safety belt according to claim 1, wherein the length of the first inflated portion is 40-50 mm, and the length of the second inflated portion is 20-25 mm.

9. A manufacturing method of a webbing for a vehicle safety belt, for preparing the webbing for a vehicle safety belt according to any one of claims 1-8, comprising the following steps: preparing weft yarns with different inflation coefficients; and interweaving the weft yarns with different inflation coefficients with warp yarns according to the length ratio and alternating change rule between the first inflated portion and the second inflated portion, the shrinkage of the webbing, and the width of the webbing, to form the first inflated portion and the second inflated portion. ​ ​ ​ ​ ​ ​

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