JPH0397949A - Fibrous formed product as flexible bag and production thereof - Google Patents

Abstract

PURPOSE:To obtain the title formed product with free shape design, through simple wrapping process, high in reliability, thus useful as an air bag, etc., by wrapping a tape consisting of fibrous filaments on a mandrel of a specified shape. CONSTITUTION:A tape where fibrous filaments are almost linearly set up so as to keep equilibrium state is wrapped on a mandrel of respectively specified dimensions and shape, and then put to take-up into a bag, thus obtaining the objective formed product. For said tape, it is preferable that yarns or tows are opened so that the filaments are almost linear and kept parallel, and furthermore, are coated with an elastomer.

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. (Prior Art) As a flexible bag fiber molded product, there is a known idea regarding an airbag that expands in the event of a vehicle collision, absorbs the shock of a seated occupant, and protects the occupant. (For example, Jikko 6
(See Japanese Patent Publication No. 1-11084, hereinafter referred to as "prior art")) Also, regarding a method of manufacturing a flexible bag fiber molded product by a filament winding method, Japanese Patent Publication No. 1-11084-
It is disclosed in Japanese Patent No. 40436.

(Hereinafter, referred to as prior art ■) (Problem to be solved by the invention) The airbag according to prior art I is usually attached to the steering wheel, and when a vehicle crashes, it detects fluctuations in the steering wheel and inflates and deploys to protect the vehicle. It protects the torso and head of the occupant. These airbags are generally made by sewing textiles, but they must be made of strong and thick material to withstand the high pressure of gas jets when they are inflated and deployed. The work involves joining together fabrics of different curves that have been cut to fit the three-dimensional shape of the fabric, which is not only difficult and requires skill, but also wrinkles and fraying occur at the joints due to the bending. The strength of the joint tends to vary. In order to prevent this, special measures are required for sewing. As a result, the airbag became bulky, which not only made it impossible to store it compactly, but also caused the problem that the sewing itself could not be completely reliable. The manufacturing process for airbags using such fabrics generally includes weaving, elastomer coating and drying, crosslinking, and the sewing process described above. This multi-step process not only increases manufacturing costs, but also increases automation (
For example, the introduction of a two-needle ξ-thin) is difficult, requires a large number of hands and time, and cannot be manufactured economically. In addition, some methods of joining fabrics by adhesive or welding without sewing are being considered, but these methods have the problem of not being reliable.

As shown in FIG. 8, the method according to prior art (2) involves winding a lobe-shaped multifilament 25 around a mandrel 26, which results in a film that is thicker and bulkier than necessary, and requires no elastomer between the filaments. It is difficult to impregnate uniformly, and since the area covered per cycle is small, it takes a considerable amount of time, so it cannot be said to be an economical manufacturing method.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a one-piece fabric that can be freely designed, has a compact structure, is easy to wrap, and is highly reliable. An object of the present invention is to provide a flexible bag fiber molded product having a structure and a method for manufacturing the same.

(Means for Solving the Problem) In order to achieve the above object, the gist of the present invention is to provide a flexible tape in which fiber filaments are arranged in a substantially linear and parallel state and wound into a bag shape. The first invention is a bag fiber molded product, and a tape is obtained in which the fiber filaments are arranged in a substantially straight and parallel state, and this tape is wrapped around a mandrel having a predetermined size and shape A second invention is a method for producing a flexible bag fiber ornament according to the first invention, which is characterized in that the fiber yarn or tow is produced by winding the fiber into a substantially straight line and parallel to each other. A flexible bag fiber according to the first invention, characterized in that the fiber is opened to obtain a tape so as to maintain its condition, and the tape is wound around a mandrel having a predetermined size and shape. The third invention is a method for producing a molded article, in which a tape in which fiber filaments are arranged in a substantially straight and parallel state is coated with an elastomer, and the tape is coated around a mandrel having a predetermined size and shape. A fourth invention is a method for manufacturing a flexible bag fiber molded product according to the first invention, which is characterized in that the fiber molded product is manufactured by winding the fiber into a substantially straight line and in a parallel state. The flexible bag fiber according to the first invention is characterized in that the arranged tape is obtained, the tape is wound around a mandrel having a predetermined size and shape, and then the surface of the tape is coated with an oestomer. The fifth invention is a method for producing a molded article, in which a tape obtained by opening a fiber yarn or tow so that the filaments are maintained in a substantially straight and parallel state is coated with an elastomer, and the tape is coated with an elastomer to a predetermined size. A sixth invention is a method for manufacturing a flexible bag fiber molded product according to the first invention, which is characterized in that the fiber molded product is manufactured by winding the fiber yarn or tow around a mandrel having a shape and shape. A tape is obtained by opening the fibers so that the fibers remain substantially straight and parallel, and after this tape is wrapped around a mandrel having a predetermined size and shape, the surface of the tape is coated with an elastomer. A method for producing a flexible bag fiber molded product according to the first invention is defined as a seventh invention, and in the fourth, fifth, sixth or seventh invention, the elastomer is a rubber-woven material; The eighth invention provides a method for producing a flexible bag fiber molded article, characterized in that a tape coated with the above-mentioned elastomer wrapped around a mandrel is subjected to a vulcanization treatment. As used herein, the term "tape" refers to "a sheet of one or more yarns (multifilament yarns) arranged in such a way that the monofilaments remain substantially straight and parallel."

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 they are not particularly limited, and include all fibers conventionally used for bonding with rubber.

The fineness of the yarn of the present invention is not particularly limited, but is generally 1,000 to 30,000 D. A range of is appropriate. 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 finer the monofilament, the easier it is to spread, for example, 0.8 to 10D. A range of is generally preferred.

Methods for opening these yarns include electrical methods, mechanical methods, and air flow methods, 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 obtained by opening at this time 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 elastomer may be coated on the tape before or after the tape is wound around the mandrel.

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

The elastomer may be a natural rubber or a mixture of two or more of natural rubber, acrylic rubber, urethane rubber, polybutadiene rubber, styrene butadiene rubber, ethylene propylene rubber, etc., reinforcing agent, Nm. Preferably, the group th contains a vulcanizing agent, a vulcanizing agent, etc. If higher heat resistance than the above elastomers is required, use heat-resistant elastomers such as chloroprene-based butyl rubber, halogenated butyl rubber, silicone-based and fluorine-based rubbers alone or in combination of two or more, and similarly strengthen the elastomer. agent, flame retardant,
A composition containing necessary ingredients such as a vulcanizing agent is preferred.

Further, the ratio of filament and elastomer may be appropriately selected depending on the purpose and required characteristics, but for example, filament: elastomer 11 90-40 F 10-6
A ratio (weight ratio) of 0 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 achieved.

In addition to dip coating methods, methods for coating filaments with elastomers include dip coating in a dispersion state, and methods in which elastomer is powder-injected or passed through a heated filament in an atmosphere in which it is scattered to melt and adhere. It can be carried out.

In the present invention, methods for winding the tape around a mandrel having a predetermined size and shape include a traverse method, a rotating arm method, and other methods in which an arm or a mandrel performs a special rotational movement to wind the tape. Either format can be applied.

Divided by shape, there are three methods: a method for wrapping closed shapes such as a cocoon, a sphere, and a cone, a method for wrapping a shape such as a cylinder or a disk, and a method for wrapping an irregular shape such as a prism or pyramid. But it can 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 air bag, the pressure can be applied evenly by using a laminated structure of at least two or more layers with different winding directions.

In the vulcanization process of an elastomer made of a rubber composition, the filaments that are adjacent to each other in a crossed or parallel state are fused together using an elastomer that has previously covered the filaments, thereby maintaining the shape after demolding and protecting the filaments. This is an important step in the present invention. The temperature conditions are preferably a temperature at which the elastomer covering the filament exhibits a predetermined adhesive strength, that is, 120 to 190°C, and in consideration of thermal decomposition of the elastomer, harsh conditions such as a heating temperature of 200"C and a heating time of 20 minutes or more are recommended. conditions should be avoided.

When forming the mandrel into a shape that can be demolded, use a deformable hollow body, such as a metal mandrel (which can be disassembled if necessary) or a rubber mandrel, and use it to form a closed shape. When shaping, use a consumable mandrel made of plaster, 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.

(Function) Since the bag is obtained by winding a tape-shaped open-woven yarn around a mandrel, there is no need for sewing, and since the filament is bonded with an elastomer, the resulting bag is flexible and free. It is foldable and strong because it is reinforced with filaments.

As described above, according to the present invention, it is possible to easily obtain a strong, flexible bag-like textile bag having an integral structure at a low cost. (Example) Examples 1 and 2 of the present invention will be described below. [Example 1] In FIG. 1, 1 is a 1500D. /
Five 1000 F yarns are arranged in a tow shape and passed through rollers 2 and 3 and between gears 4 and 5 at a speed of 10 m/sin. Gears 4 and 5 are 90m/
It rotates in the traveling direction (arrow direction) of the yarn 1 at an outer circumferential speed of win, and therefore, the yarn 1 is pulled out many times in the traveling direction by the gears 4 and 5. Furthermore, the tooth tip 4 of the gear 4 is finished sharply as shown in FIG. 2, and the tooth tip 5' of the gear 5 is finished rounded as shown in FIG. Therefore, when the yarn 1 passes between these tooth tips, the gear 4
At the sharp tip 4' of the filament, the filament is bent at an angle, so one side of the filament is always stretched beyond its elastic limit, as shown in Figure 2 (a).
Since the filament is gradually bent at the rounded tip 5' of the gear 5, the filament is not subjected to much strain as shown in FIG. 2 (opening). As a result, the filament that has passed between these gears 4 and 5 always remains strained due to being strongly stretched on only one side, so when the tension of this filament is relaxed, the difference in strain causes the filament to bend as shown in Figure 3. curls.

That is, in Fig. 1, there is a 3% overfeed state between rollers 2 and 3 and rollers 6 and 7, so the yarn pulled out by gears 4 and 5 is transferred to gears 4 and 5 and rollers. As the tension is relaxed between 6 and 7, curls occur in each monofilament that holds the yarn as shown in Figure 4 (c), and the force generated by this curl pushes other monofilaments away. , so that the yarn is about 20% transverse to the thickness
It spreads thinly to about 0 times. However, as it is, the filament is curled and elastic in the yarn length direction, so if it is stretched again by 3% between rollers 6 and 7 and rollers 8 and 9 in Figure 1 while maintaining this expanded state, , it becomes a very thin table 10 that is straight and spread laterally as shown in Figure 4 (2).

Next, this tape 10 was passed through a rubber solution impregnating device 11 to be impregnated with a rubber solution 12 in which a rubber composition having a composition shown in Table 1 on the next page was dissolved in toluene, and then the adhesion amount was reduced to 20 g/m using a doctor knife 13. ”.In this way, the rubber solution was coated with a thickness of 40 μm.
Thus, an extremely thin tape 10' having a width of 8 mm was obtained. This tape 1
An enlarged cross-section of 0' is shown in FIG. In FIG. 7, 1a is a monofilament.

Table 1 The above-mentioned tape 10' is passed through rollers l4 and l5 and delivered to a decomposable metal circle coated with a release agent in advance through a delivery eye l6 that reciprocates in a direction parallel to the rotational axis l7 of a disc-shaped mandrel I8. The tape was wound uniformly onto the plate-shaped mandrel 18 at a winding angle of 4.5° and a tape feed rate of 0.45 m/sec until there were no gaps. The aforementioned FIG. 7 is an enlarged view of the cross section of the tape 10' and the edge of the disc-shaped mandrel 18.

After this, heating at 180°C and 0.5 kg/ms
Vulcanization was performed under pressure conditions to firmly bond the monofilaments with rubber. Thereafter, the disc-shaped mandrel 18 was disassembled and the bag formed on the mandrel was taken out.

[Example 2] As a mandrel, a disk-shaped mandrel 1 shown in FIG.
8 in place of diameter 5 made of butyl rubber as shown in Figure 5.
The construction was the same as in Example 1 except that a hollow spherical mandrel 19 with a length of 0.00 m was used.

In FIG. 5, 20 is a valve for injecting air, 21 is an air supply vibrator, and 22 is a small hole bored in the air supply vibrator. The diameter of the end plate 23 installed on the air supply pipe 2l was 50 m.

In the state shown in the figure, air is blown into the hollow spherical mandrel 19 through the small hole 22 of the air supply pipe 21 by opening the valve 20, and the internal pressure of the spherical mandrel 19 is reduced to 0.3 kg/all.
The state shown is as follows.

After applying a mold release agent for rubber molds to the spherical mandrel 19 using a spray gun, the tape 10' is wound onto the spherical mandrel 19 through the delivery eye I6 at an angle of 14.5 degrees. Feed speed of 0.45s/
sec until there were no gaps left. After that, further air is injected into the spherical mandrel 19 through the valve 20 to increase the internal pressure of the spherical mandrel 19 to 0.5 kg/m+.
*”, and the mandrel was left in an oven (not shown) at 180°C for 10 minutes to complete vulcanization.
The monofilaments were firmly bonded with rubber. After this,
After taking the mandrel out of the oven and cooling it at room temperature for 30 minutes, the valve 20 is opened to remove the air inside the mandrel, and the spherical mandrel 19 made of butyl rubber is taken out together with the air supply pipe 21 to form a spherical bag as shown in FIG. body 2
I got 4.

The thickness of this bag body 24 is 120 μm, and the weight is 2 kg/mm.
It is made of high strength material that will not burst even under the internal pressure of
Approved. Then, from any part of the bag body 24, 10 mm
Five strips of 100 am were cut out and subjected to a tensile test. The breaking tension of both test pieces was 90
The strength was within the range of ~120 kg/cn+, and it was confirmed that the bag had a substantially uniform strength as a whole. (Effects of the Invention) Unlike bags formed from woven or knitted fabrics, the bag according to the present invention has a structure in which ultra-thin tape is wrapped around a mandrel, so it is easy to wrap, compact, and reliable. Since it has high elasticity and does not require sewing, it is possible to streamline the production process, and it is possible to manufacture a strong, one-piece fiber bag at a low cost. - 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 an elastomer during the vulcanization process, and remain in that state to maintain the strength of the molded product.

As described above, according to the present invention, a strong fiber-shaped bag reinforced with filaments can be obtained extremely easily. Moreover, by changing the shape of the mandrel, bags with complex shapes can be obtained as desired. ■Since the present invention allows a strong bag of any shape to be integrally shaped, 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, ad balloons, balloons such as airships, shock-absorbing bags for collisions of high-speed moving objects, It can be applied to gas bags to block explosion blasts, 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 drawings]

Fig. 1 is a side view of each process showing an embodiment of the present invention, Fig. 2 is a model diagram showing the strain that the filament undergoes, Fig. 3 is a drawing explaining the curling state of the filament, and Fig. 4 is a diagram showing the yarn. Figure 5 is a cross-sectional view of the spherical mandrel and air supply pipe, Figure 6 is a plan view of the spherical bag, and Figure 7 is an enlarged cross-section of the tape coated with rubber solution and the edge of the mandrel. FIG. 8 is an enlarged view of a cross section of a lobe-shaped multifilament and a mandrel edge according to the prior art. 1... Yarn, la... Monofilament, 10.10
”...Tape, 18...Disc-shaped mandrel, 19...Spherical mandrel, 24...Bag body Fig. 2 Fig. 4 Fig. 5 Fig. 7 Fig. 6 Fig. 8

Claims (1)

[Scope of Claims] 1) A flexible bag fiber molded product obtained by winding up a tape in which the fiber filaments are arranged in a substantially linear and parallel state 2) The fiber filaments are substantially linear 2. The flexible bag fiber according to claim 1, wherein the flexible bag fiber is produced by obtaining a tape arranged so as to maintain a parallel state, and winding this tape around a mandrel having a predetermined size and shape. 3) A tape is obtained by opening a fiber yarn or tow so that the filaments remain substantially straight and parallel, and the tape is wound around a mandrel having a predetermined size and shape. Claim 1 characterized in that the product is manufactured by attaching
Method for manufacturing the flexible bag fiber molded article 4) Coating an elastomer on a tape in which the fiber filaments are arranged in a substantially straight and parallel state, and forming the tape into a predetermined size and shape. 5) A method for producing a flexible bag fiber molded article according to claim 1, characterized in that the fabric is produced by winding it around a mandrel. 5) A tape arranged so that the fiber filaments remain substantially straight and parallel. 2. The method of manufacturing a flexible bag fiber molded product according to claim 1, wherein the tape is wound around a mandrel having a predetermined size and shape, and then the surface of the tape is coated with an elastomer. Method 6) A tape obtained by opening a fiber yarn or tow so that the filaments remain substantially straight and parallel is coated with an elastomer, and the tape is wrapped around a mandrel having a predetermined size and shape. 7) A method for manufacturing a flexible bag fiber molded product according to claim 1, characterized in that the fiber molded product is produced by winding the fibers. 7) Spreading the fiber yarn or tow so that the filaments remain substantially straight and parallel. 2. The flexible bag fiber molded product according to claim 1, wherein the tape is wound around a mandrel having a predetermined size and shape, and then the surface of the tape is coated with an elastomer. Manufacturing method 8) The elastomer is a rubber composition, and the elastomer-coated tape wound around a mandrel is subjected to a vulcanization treatment according to claims 4 and 5.
, 6 or 7. Method for producing a flexible bag fiber molded article