JPH02220828A - Filament winding forming method - Google Patents

Abstract

PURPOSE:To obtain a tough formed item and, at the same time, make it possible to recycle the resin in the formed item by a method wherein thermoplastic resin-containing continuous fiber is heated just before or after its winding to a mandrel so as to melt the thermoplastic resin containing in the fiber. CONSTITUTION:Fibers 2 are impregnated with resin 5 by being passed in a resin tank 3, in which the thermoplastic resin 5 melted by being heated with a heater 4 is stored. The resin 5 containing fibers 2 are wound round a mandrel 7 under the state being orientated by a horizontally moving delivery eye 6. The rotation of the mandrel 7 is stopped when the desired shape is presented. After that, the resulted resin-containing fiber layer is heated in a heating oven 8, resulting in melting the thermoplastic resin 5 contained in the fibers 2 and, after melting, the melted resin hardens when the temperature of said layer is brought back to normal temperature. Thus, an FRP formed item having the resin as matrix and the fibers 2 as reinforcing material is obtained. Further, by heating the formed body, the recycling of the used resin is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filament winding molding method.

[Prior Art] The filament winding molding method has been used in practice as a molding method for various rods, shafts, frames, etc. for automobiles, motorcycles, outboard grips, etc., since it allows molded products with 8 strength to be obtained.

In the filament winding molding method, it is impregnated with thermosetting resin! A step of winding a filament around a mandrel (core material) and a step of heating and curing the resin impregnated into the wound fiber are carried out.

Problems that 0TE MEI attempts to solve] The above thermosetting resin is a hard and brittle resin that does not elongate.

Therefore, with conventional molding methods using this thermosetting resin, molded products with high toughness cannot be obtained.

Furthermore, the above-mentioned conventional molding method has the disadvantage that, because of the thermosetting nature of the resin used, it is not possible to use the resin in the molded product as a glue.

In view of the above circumstances, an object of the present invention is to provide a filament winding molding method that allows a molded product having toughness to be obtained and allows recycling of the resin in the molded product.

[Means to solve the problem]

The filament winding molding method of the present invention includes a step of incorporating continuous 4 m fibers into a thermoplastic resin, a step of winding the 4 m fibers that have undergone the above steps around a mandrel, and a step immediately before or after winding the fibers around the mandrel. Thereafter, a step of heating to melt the thermoplastic resin contained in the 41 miscellaneous materials is carried out.

[Effect]

In this filament winding molding method, a matrix made of thermoplastic resin is formed.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the filament winding molding method according to the present invention.

In this example, 1 fiber roving (usually 1 to 6)
The reinforced a-fiber 2 pulled out from inside is impregnated with a thermoplastic resin.

That is, a thermoplastic resin 5 heated and melted by a heater 4 is stored in a resin tank 3 shown in the drawing, and the fibers 2 pass through this resin tank 3 to form a resin 1].
1f5 is impregnated.

In addition, as the thermosetting resin 5, a material having lower heat resistance than the 41 fiber 2 is used. For example, when aramid fiber (such as Kepler) is used as the fiber 2, A B Slf
Am etc. TFI applicable Sarel.

The fiber 2 that has passed through the resin tank 3 contains the impregnated resin 1f.
f5 is hardened and fixed.

The fibers 2 containing the resin 5 are wound around the mandrel 7 while being oriented by the delivery eye 6 moving from side to side, so that a layer of resin gold 1 fibers is formed on the surface of the mandrel 7 after a certain period of time. .

Once the layer has assumed the desired shape, the rotation of the mandrel 7 is stopped. Thereafter, the layer is heated in a heating furnace 8, and as a result of this heating, the thermoplastic resin 5 contained in the fibers 2 is melted.

After the fibers are melted, the temperature of the layer is returned to room temperature, thereby curing the molten resin.

As a result, the cured resin is interposed between the fibers, thereby obtaining an FRP molded product in which the resin is used as a matrix (base material) and the fibers 2 are used as reinforcement.

The thermoplastic resin 5 has characteristics as shown in the table below compared to thermosetting resins.

Therefore, according to this embodiment in which a thermoplastic resin is used as the matrix material, a molded product with high toughness can be obtained, and the resin can be recycled.

In the above embodiment, the 41 fiber 2 is immersed in the molten resin 5 to impregnate the 41i11f2 with the resin 5.
As shown in the figure, fibers 2b or a film made of a thermosetting resin may be incorporated in advance by machining between the fibers 2 and the fibers 2b may be wound around a mandrel 7.

Further, in the above embodiment, the resin 5 is melted by the heating device 8 to form a matrix made of the resin, but as shown by the dotted line in FIG. Even if the resin-containing fibers are arranged nearby and the resin contained in the resin-containing fibers is wound around the mandrel 7 while being melted by the heat source 9, it is possible to form a matrix made of the resin 5 in the same manner as in the above embodiment. It is.

(Effect of the invention) The filament winding molding method according to the present invention is
Since thermoplastic resin is used as the resin contained in the fiber, it is effective for molding products that require toughness, and is used in fields such as space, aviation, marine, sports, etc., in addition to parts for automobiles etc. mentioned above. It can be widely applied as a molding means for tubular parts such as rocket bodies, cylinders, pressure-resistant molds, golf shafts, etc.

Further, since there are many types of thermoplastic resins, there is a wide range of selection, and therefore it is easy to provide molded products with properties appropriate for their uses.

Furthermore, the molded product has the advantage of being able to easily undergo secondary processing such as bending by heating it, and also has the advantage that the resin used can be recycled.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing one embodiment of the filament winding molding method according to the present invention, and FIG. 2 is a sectional view showing another method of containing a thermoplastic resin. 2...Fiber, 3...Resin tank, 4...Heater, 5...
... Thermoplastic resin, 7... Mandrel, 8... Heating furnace, 9... Heating source. Applicant Suzuki Motor Co., Ltd. Figure 2

Claims (1)

[Claims] A step of incorporating a thermoplastic resin into continuous fibers, a step of winding the fibers that have undergone the above steps around a mandrel, and heating the fibers immediately before or after winding them around the mandrel. and a step of melting the thermoplastic resin contained in the fiber.