JPS63205326A - Production of cordlike or rodlike prepreg - Google Patents

Abstract

PURPOSE:To produce the title prepreg excellent in strength in both axial and radial direction, by impregnating an axially arranged fiber bundle with a reactive resin, winding a fiber around the periphery of the bundle, coating the outside with a thermoplastic resin and bringing the reactive resin to B-stage. CONSTITUTION:A roving (a) fed from a creel 11 and unidirectionally drawn is passed through a resin impregnation tank 12 whose temperature is controlled with a temperature controller 22 and impregnated with a reactive resin. The content of impregnated resin is controlled with a squeezer 13, and a braid yarn (b) is wound around the periphery of the roving (a) in the form of a braid with a braider 14. This roving may be wound in the form of a spiral. The outside is coated with a thermoplastic resin in an extruder 15. Thus, part of the reactive resin excessively infiltrated into the fiber bundle 3 exudes to the outside and infiltrates into the reinforcing layer 2 to bring the entire fibrous layer to a state impregnated with a suitable amount of the resin. The obtained product C is cooled in water-cooled apparatus 16, aged to bring said reactive resin to B-stage in an aging apparatus 17, cooled in a cooling apparatus 18, passed through a take-up motion 19 and traverser 20 and wound around a winder 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a string-like or rod-like prepreg having excellent axial and radial strength.

[Prior art]

Conventionally, most prepregs have been in the form of thin sheets or tapes, and the string-like ones have had a structure in which these are laminated or three-dimensionally woven into a so-called braided structure. However, those with a laminated structure have poor strength in the radial direction, and those with a braided structure have insufficient strength in the longitudinal direction (axial direction).

In addition, Japanese Patent Application Laid-Open No. 52-36250 discloses that after fibers are spirally wound around fiber bundles arranged in the axial direction, they are impregnated with a thermosetting resin, and this is coated with a thermoplastic resin to make a reinforced plastic. A method of manufacturing a manufactured coil spring is disclosed. However, in this case, heat is applied directly to the thermosetting resin in the process of coating it with the thermoplastic resin, and the thermosetting resin is cured, resulting in poor workability.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a string-like or rod-like prepreg that has excellent strength in the axial and radial directions and is convenient for manufacturing coil springs and the like.

[Structure of the invention]

For this reason, the present invention impregnates a fiber bundle arranged in the axial direction with a reactive resin, wraps the fibers around its outer periphery in a braided or spiral shape, and then coats this outer periphery with a thermoplastic resin. The gist of the present invention is a method for producing a string-like or rod-like prepreg, which is characterized by B-staging a plastic resin.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a partially cutaway side view of an example of a string-like or rod-like prepreg obtained by the present invention, and FIG. 2 is a sectional view thereof.

In these figures, 3 is a fiber bundle (roving, yarn) arranged in the axial direction (lengthwise direction). This fiber bundle 3
is made of, for example, glass fiber, carbon fiber, aramid fiber, etc. The fiber bundle 3 is impregnated with a reactive resin.

Here, the reactive resin is, for example, a thermosetting resin such as an epoxy resin or an unsaturated polyester resin, or an ultraviolet curable resin. Additives such as a curing agent and a curing accelerator are usually added to the reactive resin.

2 is a reinforcing layer. The reinforcing layer 2 is formed by winding fibers around the outer periphery of the fiber bundle 3 in a braided or spiral shape. The fibers in this case are, for example,
These include glass fiber, carbon fiber, aramid fiber, etc.

1 is a covering layer. The covering layer 1 is made of a thermoplastic resin such as polyethylene, polyvinyl chloride, or nylon. Additives such as plasticizers may be added to this thermoplastic resin as necessary.

Next, the manufacturing method of the present invention will be explained with reference to the process diagram shown in FIG.

The rovings a flowing out from the creel 11 and aligned in one direction pass into a resin impregnation tank 12, where they are sufficiently impregnated with a reactive resin. Note that 22 is a temperature controller for adjusting the temperature inside the resin impregnation tank 12.

Next, after exiting the resin impregnation tank 12, the amount of resin impregnation is adjusted with a squeezer 13, and the braid yarn b is wound around the outer periphery of the roving a in a braid shape with a play goo 14. Here, the braid yarn b may be spirally wound using a spiral wine goo instead of the play goo 14.

After winding the braid yarn b in this manner, its outer periphery is coated with thermoplastic resin within the extrusion device 15. After the thermoplastic resin is coated, referring to FIG. 1, the reactive resin excessively impregnated into the fiber bundle 3 oozes outward and is impregnated into the reinforcing layer 2, and the fiber layer 3 is impregnated with the reactive resin. The entire body is impregnated with an appropriate amount of resin.

The obtained product C is cooled in a water cooling device 16, and the reactive resin is B-staged in an aging device 17. B
- For staging, the product C may be heated with hot air, hot fluid, high frequency, etc., or if the product C is transparent, the product C may be irradiated with light (for example, ultraviolet light).

After this B-stage formation, the film is cooled by a cooling device 18 if necessary, passed through a take-up device 19 and a traverser 20, and then wound up by a wind-up device 21.

〔Effect of the invention〕

According to the present invention configured as described above, the following effects can be achieved.

(2) After the fiber bundles arranged in the axial direction are impregnated with the reactive resin, the fibers are wound around the outer periphery in a braided or spiral shape, making it easy to adjust the amount of reactive resin impregnated.

■ At the stage of coating with thermoplastic resin, the surface of the braided or spirally wound fibers is in a dry state, so it is possible to coat with thermoplastic resin without proceeding with curing of the reactive resin due to heat. can.

■ The obtained prepreg has no sticky surface because it is covered with thermoplastic resin.

■ Since it is B-staged, even if the prepreg is cut, the internal reactive resin will not leak out.

■ The obtained prepreg has moderate flexibility, so
It is convenient to handle.

■Easy to mold into springs, mesh fences, etc.

■ Continuous production of long prepregs is possible.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an example of a string-like or rod-like prepreg obtained by the present invention, FIG. 2 is a cross-sectional view thereof, and FIG.
The figure is a process diagram showing an example of the manufacturing method of the present invention. DESCRIPTION OF SYMBOLS 1... Covering layer, 2... Reinforcement layer, 3... Fiber bundle, 1
1... Creel, 12... Resin impregnation tank, 13...
Squeezer-214... Braider, 15...
Extrusion device, 16... Water cooling device, 17... Ripening device, 18... Cooling device, 19... Taking device, 2
0... Traverser 121... Winding device, 22
... Warming device. Figure 1 Figure 2

Claims (1)

[Claims] A fiber bundle arranged in the axial direction is impregnated with a reactive resin, the fibers are wound around the outer periphery in a braided or spiral shape, and then this outer periphery is coated with a thermoplastic resin. A method for producing a string-like or rod-like prepreg, which comprises B-staged resin.