JPH04189376A - Bamboo sword and production 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 (Industrial Application Field) The present invention relates to a shinai (shinai), and relates to the structure of a shinai (shinai) in which the wariko that constitutes the shinai (shinai) is made of a fiber-reinforced resin material, and a method for manufacturing the same.

(Prior art) Shinai that have been used in the past are formed by combining warikos made of natural bamboo. and its elasticity,
Its advantages were light weight, rigidity, and surface hardness, and because it grew naturally in large quantities in Japan, it could be obtained at a low price. However, the disadvantage of this bamboo shinai is that it is easily damaged by repeated blows, especially when the fibers are cut and torn, hangnails can form, resulting in punctures of the skin, or in the worst case, tearing. In order to improve the safety of Shinai, the structure of Shinai was changed as disclosed in Utility Model Publication No. 39-1466. In some cases, a reinforcing material layer is provided to surround the core material, and a protective material is provided to surround the reinforcing material layer, as disclosed in JP-A No. 61-62477. Composite products formed by providing layers have also been developed and put into practical use.

(Problem M that the invention attempts to solve) The above-mentioned conventional bamboo swords had the following problems.

That is, in the case of a conventional bamboo surface coated with a synthetic resin film, the film is easily torn by repeated impacts, and the durability of the bamboo itself is not improved.

Furthermore, in the case of a composite shinai made of a core material, reinforcing material, protective material, etc., the process is complicated and time-consuming, resulting in high costs.

Others: Utility Model Application No. 147465-1983 and Utility Model Application No. 58-
No. 188369 discloses a Shinai wariko made of hollow plastic or fiber-reinforced plastic, but it lacks specificity and has not yet been commercialized.

(Means for Solving the Problems) Therefore, the present invention provides an inexpensive shinai that is lightweight and durable, has easy balance design, and has low manufacturing costs, by making the wariko that constitutes the shinai a hollow structure made of fiber-reinforced plastic. It was made for the purpose of providing.

In order to achieve the above object, the present invention provides a shinai in which the outer shell strength layer of the wariko that constitutes the shinai is formed of a fiber-reinforced resin material, in which the outer shell strength layer uses continuous fibers as reinforcing fibers. This bamboo sword is characterized by being made of a monomer or prepolymer that can produce a thermosetting polyaminoamide resin or polyesteramide resin.

Examples of reinforcing fibers used in the present invention include inorganic fibers such as glass fibers, carbon fibers, ceramic fibers, boron fibers, tungsten fibers, molybdenum fibers, steel fibers, helium fibers, and stainless steel fibers, polyamide fibers,
Synthetic fibers such as polyester fibers can be used alone or in combination.These reinforcing fibers can be made into woven fabrics, rovings, mats, biaxial or triaxial braids, etc., and these shapes can be used alone or in combination. Can be used.

The reinforcing fiber content in the bamboo sword of the present invention is determined by the viscosity of the resin,
You can choose any type and shape of reinforcing fibers,
Usually about 30 to about 80% by weight, preferably about 40 to about 70% by weight.

The resin used in the present invention is 2.2'-(1,3-
phenylene) his-2-oxazoline (hereinafter referred to as 1.3-
PBO) and dibasic acids (e.g. geltaric acid,
adipic acid, azelaic acid, sebacic acid, todecanniic acid, etc.) and a catalyst (e.g., phosphorous acid, diphenyl phosphite, triphenyl phosphite, tris(nonylphenyl) phosphite, etc.). Polyesteramide resin and 1,3-PBO and diamine compounds such as diaminodiphenylmethane (e.g., diaminodiphenylmethane, 3,4'-diaminodiphenyl ether, 4,4
' -diaminodiphenylsulfone, 2,2-bis[4
-(4-aminophenoxy)phenylcopropane, etc.)
and a catalyst (e.g. alkyl bromide, alkyl iodide, P-
) Crosslinked polyaminoamide resin obtained by reaction with alkyl luenesulfonate, 2-bromopropionic acid, alkyl ester thereof, etc.) and crosslinked epoxy modified resin obtained by reaction of 1,3-PBO, diamine compound, epoxy resin, and catalyst. Thermosetting resins such as polyaminoamide resins are suitable.

When using these resins, catalysts, stabilizers, internal mold release agents, colorants, flame retardants, fillers, etc. that meet the required characteristics of each resin are added.

The viscosity of the above resin varies depending on the fiber content of the splitter, but
In order to obtain a high fiber content ratio of about 30 to 80% by weight, it is preferable to use a resin with relatively low viscosity and good impregnating properties into reinforcing fibers.
It is preferable to use a resin having a viscosity of approximately ps or less.

Furthermore, if the resin used has a very low viscosity of 100 cps or less, it will be able to "wet" the resin around the mold and to the reinforcing fibers. Moreover, it is most preferable because it is easy to mold without causing molding defects such as "slippage" of fibers or bubbles in the molded product.

The method for producing a wariko for a shinai of the present invention includes forming a core in the shape of a roughly warp, and covering the core with a reinforcing fiber material in the shape of continuous fibers or a woven fabric, roving, mat, or braid made of the continuous fibers. A molded body is formed by covering and winding these alone or in combination.

After reducing the pressure inside the mold, a material capable of producing a low-viscosity thermosetting polyaminoamide resin or polyesteramide resin is injected into the gap between the core body and the molding mold, and is reacted and cured within the mold. This is a method of integrally molding the warts using a resin injection method.

The core material is made of a meltable material or a foamed synthetic resin, and is formed into a substantially split-shaped core material.

For materials that can be melted, after the molding of the splitter, the core material is heated to a temperature that melts it but does not deform the molded body, and the core material is removed and molded into a hollow shape. It is also possible to fill the area. As the meltable core material, an alloy containing hismuth, lead, tin, cadmium, etc. as main components and having a melting temperature of 80° C. or higher and 200° C. or lower is used.

Moreover, when a core material made of foamed synthetic resin is used, a solid splitter can be obtained.

(Function) As mentioned above, since the wariko that constitutes the bamboo sword of the present invention uses thermosetting polyaminoamide resin or polyesteramide resin, the viscosity of the resin is lower than that of conventional epoxy resin or nylon resin. Since the fiber content is low, the fiber content is 30%.
It can be very large, about 80% by weight. Further, the reinforcing fibers can be in the form of woven fabric, mat, roving, biaxial or triaxial plate, and other forms depending on the required characteristics.

Furthermore, according to the method of the present invention, the viscosity of the material capable of producing thermosetting polyaminoamide resin or polyesteramide resin injected into the mold is low, so even if continuous fibers are used as reinforcing fibers, the reinforcing Since the resin can easily circulate between the fibers, the impregnating resin can easily reach every corner of the mold, and there is no risk of "slippage" of reinforcing fibers, resulting in a high degree of completion of the molded product.

(Example) An example will be described based on the drawings. 1 and 2 are explanatory diagrams of the present invention, with FIG. 1 being an external view of the product of the present invention, and FIG. 2 being an explanatory diagram of the molding method of the product of the present invention.

The continuous fibers were formed into shapes such as braids, mats, rovings, and woven fabrics. In addition, the splitter 2 of the shinai 1 was molded using a two-liquid injector as a resin injector.

First, 1.3-PBO and diaminodiphenylmethane were mixed at a weight ratio of 6:4, heated and melted at 12o0 to obtain liquid A, and octyl bromide was used as liquid B. The viscosity of liquid A was about 8 cps (120°C, type B viscometer), and the viscosity of liquid B was about 4 cps (120°C, type B viscometer). A liquid 10
The apparatus was adjusted so that the mixing ratio of liquid B to 0 parts was 1 to 2.5 parts.

On the other hand, a core A3 having a substantially splitting shape is formed of a meltable material, and a sleeve and pine roping made of reinforcing fibers 4 are wrapped around the core material 3, and the reinforcing fibers 4 are 50 to 70% by weight.
The molded body 7 was formed so as to be as follows.

The molded body 7 formed as described above is placed in the mold 5 for molding a splitter, and after the mold is clamped and the pressure inside the mold is reduced, the molded body 7 is inserted into the closed mold through the injection hole 6. A splitter 1 was obtained by injecting the resin from a two-liquid injector and causing it to react and harden.

During the above molding, the mold heating temperature is usually set at about 100 -
The temperature is about 150℃, and the pressure is about 5 to 30 kg/cm.
degree. The molding time is usually about 3 to 5 minutes.

(Effects) Since the present invention is a bamboo sword formed by converging and molding the warizi having the structure as described above, and a method for manufacturing the same, the present invention has the following effects.

=10- That is, in the shinai of the present invention, the shinai that constitutes the shinai is made of reinforcing fibers made of continuous fibers, and the fiber content is 40 to 80% by weight.
Since it is made of a molded product with a large size, bending strength, compressive strength, etc. can be improved, and the overall thickness of the FRP layer can be made thin.

Therefore, the weight of the splitter can be reduced and the degree of freedom in design can be improved.

Next, according to the method for producing a warizi of the present invention, instead of injection molding using molten thermoplastic resin, a low viscosity material capable of producing thermosetting polyaminoamide resin or polyesteramide resin is used as a liquid raw material. Since it is injected into a mold and reacted and cured in the mold, it "wets" well with the fibers, and even if the fiber content is high, it is sufficiently impregnated into the fibers.

Furthermore, unlike the conventional injection molding method using molten thermoplastic resin, the molding pressure is much lower, so it can be molded with an inexpensive mold, reducing manufacturing costs. Furthermore, since the molding pressure is low, there is no worry that the reinforcing fibers placed inside the mold will "slip" due to the pressure of the injected resin.
As strength, rigidity, etc. are improved, the outer shell layer can be made thinner and lighter, and there is also a greater degree of freedom in structural design, such as greater flexibility in balance design. have

In addition, the molding material can easily go around to every corner of the mold, preventing poor impregnation of reinforcing fibers and the generation of voids, making molding easier, and the surface condition after molding is good, giving it a beautiful appearance and improving post-processing. It does not take much time and can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 3 are explanatory views of the present invention, FIG. 1 is an external view of the product of the present invention, and FIG. 2 is an explanatory view of the molding method of the product of the present invention. 1... Shinai, 2... Wariko, 3... Core material, 4...
Reinforcing fiber, 5... Mold, 6... Injection hole, 7... Molded object. Procedural amendment written on May 22, 1991 2, Name of the invention: Shinai and its manufacturing method 3, Relationship with the case to be amended Patent applicant Address: 4-1-28 Kitahama, Chuo-ku, Osaka 541 Place Guyaruin 06-223-7305 April 23, 1991
May 14, 1996 (all sending dates) 5. A column for a brief explanation of the drawings in the specification subject to amendment. 6. Contents of the Amendment In the 11th line of page 12 of the description, the phrase ``Figures 1 to 3'' is amended to ``Figures 1 to 2''.

Claims (1)

[Scope of Claims] 1. In a warizo in which the wariko that constitutes the bamboo sword is made of a fiber-reinforced resin material, the outer shell strength layer of the warashi is made of thermosetting polyaminoamide resin or thermosetting polyaminoamide resin, with continuous fibers as reinforcing fibers. A bamboo sword characterized by being molded by a resin injection method using a material capable of producing polyesteramide resin. 2. The viscosity of the material capable of producing the thermosetting polyaminoamide resin or polyesteramide resin is 100CP.
The bamboo sword according to claim 1, wherein the bamboo sword has a diameter of S or less. 3. Form a roughly split-shaped core that forms a bamboo sword, cover and wind reinforcing fibers around the core to form a molded body, place the molded body in a mold for molding the split, and then It is characterized by injecting a low-viscosity material capable of producing thermosetting polyaminoamide resin or polyesteramide resin into the gap between the core and the molding die, and molding by reaction-curing it in the mold. How to make bamboo swords.