JPH0415143A - Impact absorbing bag - Google Patents

Abstract

PURPOSE:To maintain the predetermined performance of an impact absorbing bag even under bad environmental conditions for a long period so as to extremely enhance the reliability and adaptability to practical use of the bag by winding into a bag a tough tape comprising filaments of fiber and an elastomer firmly stuck together. CONSTITUTION:Open weaving yarn 1 in the form of a tape is passed through an RFL processing device 3 filled with an RFL 2 and is then dried in a drying chamber 4. The open weaving yarn is then passed around 5, 6 and through a rubber solution impregnating device 7 and impregnated with a rubber solution 8 and then the amount of rubber attached to the yarn is controlled using a doctor knife 9. A tape thus obtained is passed between opposite rollers 10, 11 and passed around rollers 12, 13 and wound onto a disc-shaped mandrel 16 via a delivery eye 14 reciprocating in the direction parallel to a rotary shaft 15; i.e. the tape-shaped open weaving yarn 1 is subjected to an adhesion treatment and an elastomer with which the yarn is coated and filaments of fiber are firmly stuck together and integrally joined.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is normally housed in the center of the steering wheel of a vehicle, and upon a vehicle collision, it senses the impact and instantly inflates and deploys to protect the driver, etc. The present invention relates to shock absorbing bags (so-called airbags) for ensuring safety.

[Prior Art] Airbags are devices that instantaneously send gas into the bag by exploding gunpowder, so they are required to sufficiently withstand the impact.

The conventionally provided airbags are:
After forming a polymer coating on one side of a flat woven fabric, the two coated woven fabrics are stacked so that the coated sides face each other, and the periphery is sewn to form a bag.

For example, in the prior art section of Japanese Patent Application Laid-open No. 51-4742 (invention related to a bag for an airbag device and a manufacturing method thereof), it is stated that ``a circular piece of cloth is cut out from two square pieces of cloth and the periphery is sewn together. (hereinafter referred to as Prior Art I) Furthermore, as an earlier invention by the present applicant, an invention relating to a shock absorbing bag and a method for manufacturing the same (Patent Application No. 2-1010
No. 0). (Hereinafter, referred to as prior art ■) [Problem to be solved by the invention] However, as in prior art ■, the method of manufacturing airbags by sewing involves many manual steps, making it difficult to automate and economically manufacturing. There are problems such as: the strength of some sewing areas is lower than others, and it takes time and effort to inspect the strength and air permeability of sewing areas. There is a problem of lack of trust.

On the other hand, the shock absorbing bag according to Prior Art H solves the problems of Prior Art 1, and is a tape-shaped spread fiber bag in which the fiber filaments are arranged in a substantially straight and parallel state. Since it has a structure in which a tape of yarn or spread yarn is wound into a bag shape, there is no need for sewing, and it is easy to manufacture, homogeneous, highly reliable, and strong.

In the present specification, "tape-shaped spread yarn" refers to [1
``Spread yarn tape'' refers to ``a sheet of yarns (multifilament threads) arranged in such a way that the monofilaments are maintained in a substantially straight and parallel state'';"The monofilaments that make up the spread yarn are bonded together and integrated."

By the way, airbags for automobiles are stored in a narrow space inside the steering wheel in an extremely densely stacked manner. What's more, the temperature inside a car can reach 80 degrees Celsius in direct sunlight in midsummer, and below zero in midwinter. In this way, airbags are kept in tight spaces under harsh conditions for long periods of time (the lifespan of a car).
During this time, the filaments that make up the spread yarn tape and the elastomer that is the binder separate, and if explosives, etc. are detonated, the high pressure generated on the inside of the bag will cause a large opening to start from the separated point. When a section is formed, pressure wind blows out, and the specified impact mitigation function cannot be exerted, which not only makes it impossible to protect the human body in the event of a collision, but also may cause secondary disasters.

However, airbags have an important mission of protecting human lives, and they must maintain their specified functions even when exposed to harsh conditions for long periods of time.

However, when the shock absorbing bag according to Prior Art H is placed in the above-mentioned usage environment, it is difficult to maintain a predetermined performance for a long period of time.

The present invention was made in view of the above-mentioned problems of the conventional technology, and its purpose is to provide a uniform product that does not deteriorate in its predetermined functions even if left under harsh conditions for a long period of time. To provide a shock-absorbing bag that is easy to store, can be stored compactly, and has extremely high reliability.

[Means to solve the problem]

In order to achieve the above object, the gist of the present invention is to provide a shock absorbing bag in which a tape-shaped spread yarn coated with an elastomer is rolled up into a bag shape, in which an adhesive treatment is applied to the tape-shaped spread yarn. It is a shock-absorbing bag that features a

The fibers of the present invention typically include human silk, polyvinyl alcohol fibers, aliphatic and directional polyamide fibers,
Examples include polyester fibers, carbon fibers, glass fibers, etc., but they are not particularly limited, and include all fibers conventionally used for bonding with rubber.

The fiber opening method of the present invention includes an electrical method, a mechanical method,
There is a method using air flow, but any method can be used as long as the purpose can be achieved.
Any method such as that disclosed in Japanese Patent No. 626 may be used.

Note that the tape-shaped spread yarn obtained by the opening process must be extremely uniform (with little variation in thickness). In addition, the monofilaments must be completely separated from each other, and their spacing must be close enough that the average spacing is less than the average diameter of the filaments.

As the adhesive used in the adhesive treatment of the present invention, a fiber adhesive that is used shotally can be used as long as it has good adhesion to the elastomer.

For example, this adhesive may be a mixture of a condensate of redulucin and formalin with latex, or a mixture of these with caustic soda or the like (hereinafter referred to as RF L),
Product names: Chemronc 218, Chemlock 252, Chemronc 607, manufactured by Hugheson Chemicals.
Kemrok 205, Kemro 7ri 220, Kemro Sok A
P 133 and Chemulosoku 402, products manufactured by Sumitomo Bayer Urethane Co., Ltd. under the trade name Desmodur RF, Sumidur L and Desmophenon 1200, manufactured by Nippon Elastran ■ under the trade name GY20Z980, Nagase Chemical Industries ■ under the trade name Bunacol. EX521's,
Product name Vandenx'r520 manufactured by Dainippon Ink Industries Co., Ltd.
5 and Hytran HW311, product name MDI-CR-300 manufactured by Mitsui Nisso Tsuretan ■, product name Epicoat #815 manufactured by Yuka Shell Epoxy ■, product name Primer #4 manufactured by Shin-Etsu Chemical ■. Bayer A
Examples include Cohedule RL manufactured by Company G.

The gluing process can be performed before or after opening the fiber yarn or tow to obtain a tape-like spread yarn, or the gluing process can be performed while using an adhesive as a lubricant during the opening process. You can also do

In order to enhance the adhesive effect, it is necessary to sufficiently dry the adhesive-treated tape-shaped spread yarn. In addition,
When using commercially available fibers, the adhesive effect can be improved by removing the oil coated on the filament surface.

The adhesive-treated tape-shaped spread yarn may be coated with an elastomer before or after the tape-shaped spread yarn is wound around a mandrel.

The elastomer used in the present invention preferably has flexibility and appropriate elasticity.

The elastomer may be a mixture of natural rubber or synthetic rubber such as acrylic, urethane, polybutadiene, styrene-butadiene, or ethylene-propylene, reinforcing agents, flame retardants, vulcanizing agents, etc. A composition containing the following is preferred. If higher heat resistance than the above elastomer is required, use a heat-resistant elastomer consisting of synthetic rubbers such as chloroprene butyl rubber, halogenated butyl rubber, silicone rubber, and fluorine rubber, either singly or in combination, and use a reinforcing agent as well. A composition containing necessary ingredients such as , flame retardant, and vulcanizing agent is preferred.

In the present invention, since the filaments are spread apart, when impregnated with the above-mentioned elastomer solution, the monofilaments penetrate well and can be bonded uniformly between the monofilaments with a small amount of elastomer. can be increased. In particular, when the filament content ratio is 50% or more F, it becomes possible to exhibit unprecedentedly high strength characteristics.

In addition to the dip coating method, methods for coating elastomer on tape-shaped spread fibers include dip coating in a dispersion state, and tape-shaped spread fibers heated in an atmosphere in which the elastomer is powder-injected or scattered. A method of passing a thread through and melting the adhesive can also be performed.

A method of winding a tape-shaped spread yarn coated with an elastomer into a bag shape is to wind it around a mandrel having a predetermined size and shape. Any type of winding method, such as a rotating arm type, or a special type in which an arm or a mandrel is wound with a special rotational movement, can be applied.

By winding shape, there are methods for winding closed shapes such as cocoons, spheres, and cones; methods for winding shapes such as cylinders and discs; and methods for winding irregular shapes such as prisms and pyramids. This method can also be applied.

Although there are various winding patterns, a predetermined strength can be imparted by broadly classifying them into parallel winding, helical winding, longitudinal winding, or a combination thereof. In cases where pressure is generated inside the bag, such as in an airbag, the pressure can be applied evenly by forming a laminated structure of two or more layers with different winding directions.

When molding into a removable shape, use a deformable hollow mandrel, such as a metal mandrel (which can be disassembled if necessary) or a rubber mandrel, and mold it into a closed shape. If so, use a consumable mandrel made of gypsum, rock salt, easily fused metal, etc. In order to easily remove the mandrel after molding, it is desirable to apply a mold release agent to the mandrel in advance.

When the elastomer is made of a rubber composition, it is desirable to perform a vulcanization treatment, and the vulcanization treatment involves fusion-welding the adjacent filaments in a crossed or parallel state with an elastomer that has previously covered the filaments. This is done for the purpose of maintaining the post-mold formation and also protecting the filament I. The temperature condition is the temperature at which the elastomer covering the filament exhibits a predetermined adhesive force, that is, 120 to 1
The temperature is preferably 90°C, and harsh conditions such as a heating temperature of 200°C or more and a heating time of 20 minutes or more should be avoided in consideration of thermal decomposition of the elastomer.

(Function) Since the tape-shaped spread yarn is subjected to an adhesive treatment, the coated elastomer and the fiber filaments are firmly adhered and integrally bonded, making it possible to obtain a strong spread yarn tape. Nolig, which is made by winding a tape of such spread yarn into a bag shape, maintains a predetermined performance over a long period of time and ensures high conversion properties.

〔Example〕

Examples of the present invention will be described below.

In Figure 1, 1 is 66 nylon 1260D.

A tape-shaped spread yarn obtained by aligning five /315F yarns to form a tow and opening the tape-shaped spread yarn 1. After passing through the RFL processing device 3 filled with liquid 2 to perform the R, FI= treatment, it was dried in the drying chamber 4 at 120"C for 10 minutes.

Next, this tape-shaped spread yarn was passed through a rubber solution impregnating device 7 via a roller 5.6 and impregnated with a rubber solution 8 in which a rubber composition having the composition shown in Table 2 on page 14 was dissolved in toluene. The adhesion amount was controlled to 20 g/m'' using a doctor knife 9.

Arrow A indicates the traveling direction of the tape-shaped spread fiber 1.

In this way, an ultra-thin tape with a thickness of 40 μm and a width of 8 coats coated with the rubber solution was obtained, and this tape was passed between the opposing rollers 10 and 11.
．． 13, a disassembleable metal disc-shaped mandrel 1 coated with a release agent in advance is delivered via a delivery eye 14 that reciprocates in a direction parallel to the rotating shaft 15 of the disc-shaped mandrel 16.
6, winding angle 14.5°, tape feed speed 0
．． It was wound uniformly for 45 ml for 1 second until there were no gaps.

Thereafter, the monofilaments were vulcanized under heating and pressure conditions of 180° C. and 10.5 kg/cm 2 to firmly adhere the monofilaments with rubber. Then, the disk-shaped mandrel 16 was disassembled and the shock absorbing bag formed on the mandrel was taken out. The state in which the shock absorbing bag 17 is inflated and deployed is shown in FIG.

Table 1 Table 2 (Comparative Example) As a comparative example, a shock absorbing bag was produced in exactly the same manner as in the example except that RFL treatment was not performed.

(Pressure test) For each of the examples and comparative examples, 1000 bags were made in the manner described above, and these bags were folded and left at 120°C for 200 hours, and then the bags were subjected to 2.1 The number of bags that did not burst when subjected to an internal pressure of kg/cm2 was investigated.

The results are shown in Table 3 below.

Table 3 As is clear from Table 3, none of the bags according to this example burst out of 1,000 even after being exposed to severe environmental conditions, but only 7 bags according to the comparative example burst. did. Thus, according to the present invention, it is possible to provide an extremely reliable shock absorbing bag.

[Effects of the invention] ■The shock-absorbing bag according to the present invention has a structure in which a strong tape made of fiber filaments and an elastomer is tightly bonded is wound into a bag shape, so it can withstand being placed in poor environmental conditions for a long period of time. The specified performance is maintained and the reliability is extremely high.
This is an extremely excellent invention in practical terms.

■The shock absorbing bag according to the present invention is most suitable for automobile airbags which require high strength and high reliability. In addition, the technology of the present invention can be used to produce hot air balloons, atto balloons, balloons such as airships, shock-absorbing bags for collisions of high-speed moving objects, gas bags for blocking blast waves caused by explosions in mines, etc. For powder, flexible container,
For liquid use, fuel tanks, water storage tanks, etc.
It can also be applied to heat-resistant insulation materials for civil engineering construction work.

[Brief explanation of drawings]

FIG. 1 is a side view of each step of manufacturing the shock-absorbing rug of the present invention, and FIG. 2 is a perspective view showing the shock-absorbing bag in an inflated and deployed state. 17. Shock absorption bag

Claims (1)

[Claims] A shock-absorbing bag made of a tape-shaped spread yarn coated with an elastomer wound into a bag shape, characterized in that the tape-shaped spread yarn is subjected to an adhesive treatment.