JPH0424143A - Flexible bag fiber molded product and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flexible bag fiber molded product and a method for manufacturing the same.

[Conventional technology]

The flexible bag fiber molded product is usually stored in the center of the steering wheel of a vehicle, and when the vehicle collides or suddenly stops, it senses the impact and instantly inflates and deploys to ensure the safety of the occupants. Things related to bags are known.

This airbag is designed to instantly send gas into the hang by exploding gunpowder, so it must be able to 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. "Manufacturing a flat airbag" is disclosed.

[Problem to be solved by the invention]

However, the method of manufacturing airbags by sewing involves many manual steps, which makes it difficult to automate and cannot be manufactured economically.The strength of the sewing parts may be lower than other methods, and the strength of the sewing parts There are problems such as the time and effort required to test the air permeability, and in addition, there is the problem that the sewing itself cannot be sufficiently trusted.

Therefore, if an excessively strong and thick woven fabric is used to improve reliability, the airbag becomes bulky and cannot be stored compactly in the center of the steering wheel or the like.

The present invention has been made in view of the problems of the prior art, and its purpose is to provide a lightweight flexible bag that is homogeneous, highly reliable, easy to manufacture, can be stored compactly, and is lightweight. An object of the present invention is to provide a body fiber molded product and a method for producing the same.

[Means to solve the problem]

In order to achieve the above object, the gist of the present invention is to provide a tape-like product in which fiber filaments are arranged in a substantially linear and parallel state, or a flexible bag fiber molded product in which the tape is wound into a bag-like shape. The first invention is to obtain a tape-like product in which fiber filaments are arranged in a substantially straight and parallel state, and to wrap this tape-like material around a mandrel having a predetermined size and shape. A second invention provides a method for manufacturing a flexible bag fiber molded article, which is characterized in that it is manufactured by winding the fibers, and the fiber yarns or tows are opened so that the filaments are maintained in a substantially straight and parallel state. A third method of manufacturing a flexible bag fiber molded article is provided, which comprises manufacturing a flexible bag fiber molded article, which is characterized in that the tape-like article is obtained by winding the tape-like article around a mandrel having a predetermined size and shape. In this invention, a tape is obtained by coating a tape with an elastomer in which the fiber filaments are arranged in a substantially straight and parallel state, and the tape is wrapped around a mandrel having a predetermined size and shape. A fourth invention is a method for manufacturing a flexible bag fiber molded product characterized by manufacturing it by winding it, and a tape-like product in which the fiber filaments are arranged in a substantially straight and parallel state. A flexible bag fiber molded product characterized in that the tape-like material is wound around a mandrel having a predetermined size and shape, and then the surface of the tape-like material is coated with an elastomer. The manufacturing method is the fifth invention, and a tape is obtained by opening a fiber yarn or tow so that the filaments are maintained in a substantially straight and parallel state, and coating the tape with an elastomer to obtain a tape. A sixth invention provides a method for producing a flexible bag fiber molded article, which is characterized in that the fiber yarn or tow is produced by winding it around a mandrel having a predetermined size and shape. After opening the fibers in a straight and parallel state to obtain a tape-like material, and wrapping this tape-like material around a mandrel having a predetermined size and shape, the surface of this tape-like material is A seventh invention is a method for producing a flexible bag fiber molded product, characterized in that the fabric is coated with an elastomer. The first invention provides a method for producing a flexible bag fiber molded article, which is characterized in that a tape coated with the above-mentioned elastomer, which is made of a plastic resin, is wound around a mandrel and subjected to a crosslinking treatment.

In this specification, the term "tape-like material" refers to "a material in which one or several yarns (multifilament threads) are arranged in a sheet-like manner so that the monofilaments remain substantially straight and parallel." Okay, "tape" means "
"A product in which the monofilaments constituting the above-mentioned tape-like material are mutually bonded and integrated."

The fibers of the present invention typically include human silk, polyvinyl alcohol fibers, aliphatic and aromatic polyamide fibers,
Examples include polyester fibers, carbon fibers, glass fibers, etc., but the fibers are not particularly limited, and include all fibers that can be bonded to resin.

The fineness of the yarn of the present invention is not particularly limited, but is generally in the range of 30 to 30,000 D. Of course, these do not necessarily need to be supplied in the form of a single thread; rather, it is easier to spread laterally if a plurality of threads are supplied at the same time. The thinner the monofilament fineness is, the easier it is to spread, and a range of, for example, 0.8 to 10D is generally preferred.

Methods for opening these yarns include electrical methods, mechanical methods, and methods using air flow, but any method may be used as long as the purpose can be achieved.
Any method such as that disclosed in Japanese Patent No. 3-69626 may be used.

Note that the tape-like material obtained by the opening 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 filament diameter.

The tape may be coated with an elastomer before or after the tape is wound around the mandrel.

In addition to the dip coating method, methods for coating the elastomer include dip coating in a dispersion state, and methods in which the elastomer is powder-injected or passed through a heated filament in a scattered atmosphere to melt and adhere. can.

The elastomer used in the present invention is preferably a crosslinkable thermoplastic resin, such as vinyl chloride resin (PVC), polyethylene (PE), polypropylene (PP), ethylene-acid picopolymer (EVA), chlorinated polyethylene (
CPE), thermoplastic urethane (TPU), styrene resin, etc. can be used. These polymers can be made into a liquid by dissolving them in plastisol, emulsion, organic solvent, or the like.

Further, the ratio of filament to elastomer may be appropriately selected depending on the purpose and required characteristics, but for example, filament: elastomer -90 to 40: 10 to 6.
A ratio of 0 (!1 quantity ratio) is used. In particular, in the present invention, since the filaments are spread apart, when impregnated with the above-mentioned elastomer solution, the monofilaments can penetrate well and the monofilaments can be bonded uniformly with a small amount of elastomer, thus relatively increasing the filament ratio. be able to. In particular, when the content ratio of filaments is 50% or more, it becomes possible to bring out unprecedentedly high strength properties. In order to have a high content ratio of filaments and to allow the elastomer solution to penetrate well between the monofilaments, the filaments must be opened sufficiently to incorporate the elastomer solution into the monofilaments, and then the excess elastomer must be removed using a sharp edge such as a doctor knife. If a method such as removing the elastomer is used, it is possible to increase the filament ratio and obtain a composite structure in which the filament and the elastomer are completely integrated.

The filling rate of the elastomer between the monofilaments is approximately 60% or more of the voids between the monofilaments, especially 70% or more of the voids between the monofilaments.
Preferably, it is 90% or more filled with elastomer. If this filling rate is low, the object of the present invention cannot be fully achieved.

In the present invention, methods for winding a tape or a tape-like material around a mandrel having a predetermined size and shape include a traverse method, a rotating arm method, and other methods in which the arm or mandrel has a special rotational movement. Any special type of winding can be applied.

Divided into shapes, there are three methods: wrapping closed shapes such as cocoons, spheres, and cones; winding cylindrical and disc shapes; and winding irregular shapes such as prisms and pyramids. It can also be applied by method.

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, by forming the bag with a laminated structure of at least two or more layers with different winding directions, the pressure can be applied uniformly.

Cross-linking treatment of elastomers made of thermoplastic resin is used to fuse adjacent filaments in a crossing or parallel state with an elastomer that covers the filaments in advance, to maintain the shape after demolding and to protect the filaments. This is an important step in the present invention.

The temperature condition is preferably a temperature at which the elastomer covering the filament exhibits a predetermined adhesive force, that is, 120 to 190°C. Considering thermal decomposition of the elastomer, the heating temperature is 2.
Harsh conditions such as temperatures above 00°C and heating times of 20 minutes or more should be avoided.

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.

[Effect]

Since the bag is obtained by winding a tape-shaped spread thread or a tape of spread thread around a mandrel, there is no need for sewing, and since the filament is bonded with an elastomer, the resulting bag is It is flexible and can be folded freely, and is strong because it is reinforced with filaments.

As described above, according to the present invention, a strong flexible bag fiber molded product having an integral structure can be obtained easily and inexpensively.

〔Example〕

Examples 1 and 2 of the present invention will be described below.

(Example 1) In FIG. 1, 1 is 1500D of polyparaphenylene/3.4 diphenyl ether/terephthalamide;
This is a tape-shaped spread yarn obtained by mechanically opening five 1000 F yarns arranged in a tow shape. After impregnating the EVA emulsion solution 3 with the formulation shown in Table 1 on page 16, the amount of adhesion was controlled to 20 g/1112 using a doctor knife 4. Arrow A
indicates the traveling direction of the tape-shaped spread yarn 1.

Coated with the elastomer solution in this way,
An extremely thin tape 5 having a thickness of 40 μm and a width of 8 mm was obtained.

An enlarged cross-section of this tape 5 is shown in FIG. In FIG. 2, 6 is a monofilament.

Then, the tape 5 is passed between opposing rollers 7.8, passed through rollers 9.10, and then passed through the disc-shaped mandrel 13.
The delivery eye 1 reciprocates in a direction parallel to the rotation axis 12 of the
1 onto a decomposable metal disk-shaped mandrel 13 coated with a release agent in advance, the tape is wound uniformly at a winding angle of 14.5° and a tape feed speed of 0° and 45 m/sec until there are no gaps. Wearing. The above-mentioned FIG. 2 is an enlarged view of the cross section of the tape 5 and the edge of the disc-shaped mandrel 13.

Thereafter, the monofilaments were crosslinked at 180° C. for 60 minutes to firmly adhere the monofilaments using an elastomer. and,
The disc-shaped mandrel 13 was disassembled and the bag formed on the mandrel was taken out. The state in which the bag body 14 is inflated and deployed is shown in FIG.

Table 1 (Example 2) As Example 2, the formulation of the elastomer solution is shown in Table 2 on the next page.
A tape of the spread yarn was wound around the disc-shaped mandrel 13 in the same manner as in Example 1, except that the procedure was as follows.

Thereafter, the monofilaments were crosslinked at 170° C. for 60 minutes to firmly adhere the monofilaments together using an elastomer. and,
The disc-shaped mandrel 13 was disassembled and the bag formed on the mandrel was taken out. The state in which this bag is inflated and deployed is the same as that shown in FIG.

Table 2 (Comparative Example) As a comparative example, a plain woven fabric with a warp density and a weft density of 24 threads/bag' was produced using 840 denier yarn. Next, an elastomer solution having the composition shown in Table 1 on page 16 was applied to one side of this plain woven fabric. The coating amount was 65 g/m'' in terms of solid content.
Two woven fabrics coated with an elastomer on one side were obtained by crosslinking for 14 minutes, and a bag having the same shape as in Example 1 was produced by sewing the two woven fabrics. The weight of this bag was 360 g.

(Performance Comparison Test) Next, a comparative test was conducted on the bag according to Example 1 and the bag according to Comparative Example in terms of pressure resistance, storability, and expandability according to the following method.

■Pressure resistance 100 for each of Examples and Comparative Examples
0 bags were made, each bag weighed 2 kg/c1112
The number of bags that did not burst was investigated by applying an internal pressure of

■Storability The height when the bags were folded into a 20 cm square and stacked was measured and expressed as an index with the height of the comparative example as 100. The lower this index is, the more flexible and excellent the storage property is.

■ Deployability When an internal pressure of 2 kg/cm'' was applied to the bag, the time required for the tip of the bag to reach the fully expanded position was measured, and expressed as an index with the comparative example being 100.

The lower the index, the better the speed and developability.

The above test results are shown in Table 3 below.

Table 3 As is clear from Table 3, the bag according to this example weighs 2 kg/
cm'' pressure resistance test, none of the 1,000 bags burst, but nine of the bags in the comparative example burst, and the rupture locations were at the seams. It is also significantly superior to the comparative example in terms of storage and expandability.

〔Effect of the invention〕

■The flexible bag fiber molded product according to the present invention is different from bags molded from woven or knitted fabrics because it has a structure in which an extremely thin tape or tape-like material is wound around a mandrel.
It is easy to wrap, is compact, has high reliability, and does not require sewing, so the production process can be streamlined, and a strong flexible bag fiber molded product with an integrated structure can be manufactured at low cost.

(2) In the present invention, since the filament is bonded with an elastomer, the resulting flexible bag fiber molded product is flexible and can be folded freely.

(2) In the present invention, the filaments are fused to each other by the elastomer in a crosslinking process, and remain in that state to maintain the strength of the molded product.

As described above, according to the present invention, a tough flexible bag fiber molded product reinforced with filaments can be obtained very easily. Furthermore, by changing the shape of the mandrel, bags of complex shapes can be obtained as desired.

■Since the present invention allows a strong bag of any shape to be integrally molded, the flexible bag fiber molded product according to the present invention
In particular, it has an exhaust port, a mounting port, etc., and is ideal for automotive airbags that require high strength. In addition, by changing the ratio of filament and elastomer using the technology related to the present invention, it can be used for gases such as hot air balloons, atto balloons, balloons such as airships, shock-absorbing bags during collisions of high-speed moving objects, and mines. It can be applied to gas bags for blocking blast waves caused by explosions, flexible containers for powders, fuel tanks and water storage tanks for liquids, and heat-resistant insulation materials for civil engineering construction work.

[Brief explanation of the drawing]

Fig. 1 is a side view of each step showing an embodiment of the present invention, Fig. 2 is an enlarged view of the elastomer-coated tape cross section and the mandrel edge, and Fig. 3 is a state in which the bag according to the present invention is inflated and deployed. FIG. l... Tape-shaped spread yarn, 5... Tape, 6... Monofilament, 13... Disc-shaped mandrel, 14... Bag body

Claims (1)

[Scope of Claims] 1) A tape-like product in which fiber filaments are arranged in a substantially linear and parallel state, or a flexible bag fiber molded product in which the tape is wound into a bag-like shape.2) A fiber molded product made of fibers It is characterized in that it is manufactured by obtaining a tape-like product in which the filaments are arranged in a substantially linear and parallel state, and winding this tape-like material around a mandrel having a predetermined size and shape. Method for manufacturing a flexible bag fiber molded product 3) A tape-like product is obtained by opening the fiber yarn or tow so that the filaments are maintained in a substantially straight and parallel state, and this tape-like product is prepared in a predetermined manner. A method for producing a flexible bag fiber molded product, characterized in that it is produced by winding it around a mandrel having a size and shape of 1. Production of a flexible bag fiber molded product, characterized in that the tape is obtained by coating a tape-like product with an elastomer, and the tape is produced by wrapping the tape around a mandrel having a predetermined size and shape. Method 5) Obtain a tape-like product in which the fiber filaments are arranged in a substantially straight and parallel state, and then wrap this tape-like material around a mandrel having a predetermined size and shape. A method for producing a flexible bag fiber molded product, which is characterized by coating the surface of this tape-like material with an elastomer 6) Spreading the fiber yarn or tow so that the filaments remain substantially straight and parallel. A flexible bag fiber molding characterized in that the obtained tape is coated with an elastomer to obtain a tape, and the tape is wound around a mandrel having a predetermined size and shape. Method for manufacturing a product 7) A tape-like product is obtained by opening a fiber yarn or tow so that the filaments are maintained in a substantially straight and parallel state, and this tape-like product has a predetermined size and shape. A method for producing a flexible bag fiber molded article, which comprises wrapping the tape around a mandrel and then coating the surface of the tape with an elastomer.8) The elastomer is a crosslinkable thermoplastic resin, and the elastomer is a crosslinkable thermoplastic resin,
The method for producing a flexible bag fiber molded product according to claim 4, 5, 6, or 7, characterized in that a tape coated with the elastomer wrapped around a mandrel is subjected to a crosslinking treatment.