JPH0519902B2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for manufacturing a tubular body.

<Prior Art> Conventionally, tubular bodies used for fishing rods and the like are manufactured through the following steps.

<A> Prepreg wrapping Fiber aligned sheets of carbon fiber, glass fiber, etc., or their woven fabrics impregnated with thermosetting synthetic resin such as epoxy (prepreg)
Wrap around the core metal.

<B> Taping 5 kg of tape made of polypropylene, cellophane film, etc. is placed on top of the prepreg wrapped around the core metal.
Taping is performed by wrapping it with a certain amount of tension.

This taping is performed for the following purposes.

That is, the prepreg wrapped around the core metal is brought into close contact with the core metal.

Also, when the prepreg is rolled up, the air bubbles caught inside are released.

In particular, completely expelling air bubbles is an important condition for producing high-quality tubular bodies.

<C> Thermosetting treatment After taping, heat treatment is performed to harden the thermosetting synthetic resin.

<d> Pulling out the core After the thermosetting synthetic resin has hardened, pull out the core.

At this point, a resin tubular body whose surface is wrapped with tape has been formed.

<E> Resin surface treatment Remove the tape wrapped around the resin surface,
Sand the tape marks on the surface to eliminate unevenness.

Then, to protect the surface, it is painted with urethane paint, etc., and the resin surface treatment is completed.

Once the surface treatment is completed, the tubular body for use in fishing rods and the like has been completed.

<Problems to be Solved by the Present Invention> The conventional manufacturing method described above has the following problems.

<B> Since cellophane film or the like is used, it is difficult to completely expel air bubbles by taping.

For this reason, it is important to manufacture high-quality tubular bodies.
It's not easy.

<B> After taping, it is necessary to remove the tape and perform surface treatment such as polishing the surface, which is time-consuming.

<Purpose> The present invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a tubular body that is easy to manufacture and does not require much effort. .

<Means for Solving the Problems> The present inventor has realized that the above object can be achieved by using polyurethane, which has high elongation and wear resistance, instead of cellophane film or the like in the taping process.

That is, the method for manufacturing a tubular body of the present invention is characterized in that taping is performed using polyurethane formed into a tape shape.

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

<A> Layering of prepreg (Fig. 1) Fiber aligned sheet of carbon fiber, glass fiber, etc., or woven fabric of these impregnated with thermosetting synthetic resin such as epoxy (Prepreg 2)
Wrap around core metal 1.

<B> Taping (Fig. 1) A stretched polyurethane tape 3 is wrapped around the prepreg 2 wrapped around the core metal 1.

<C> Thermosetting treatment After taping, heat treatment is performed under the conditions shown in FIGS. 2 and 3 to harden the thermosetting resin.

That is, the relationship between temperature and elapsed time is adjusted as follows.

[Relationship between temperature and elapsed time in Figure 2] 0 to 15 minutes: Increased to 110℃ 15 to 30 minutes: 110℃ 30 to 45 minutes: Increased to 160℃ 45 to 60 minutes: 160℃ 60 to 75 minutes: 160 From °C to room temperature [Relationship between temperature and elapsed time in Figure 3] 0 to 15 minutes: Rise to 80 °C 15 to 30 minutes: 80 °C 30 to 45 minutes: Rise to 140 °C 45 to 60 minutes: 140 °C 60 to 75 minutes: From 140℃ to room temperature In this case, the wrapped polyurethane
Adheres to thermosetting synthetic resin.

In particular, it has been confirmed that when the thermosetting synthetic resin is epoxy, it adheres well.

Further, the wrapped polyurethane 3 is also bonded and integrated by heat to form a polyurethane layer on the surface of the thermosetting synthetic resin.

<d> Pulling out the core Once the thermosetting synthetic resin has hardened, pull out the core.

In this example, polyurethane was used for the taping, and a polyurethane layer was formed on the surface of the resin.

Therefore, removing the tape, polishing the surface,
Since a surface treatment process such as painting is not necessary, once the process of pulling out the metal core is completed, a tubular body that can be used for fishing rods and the like is completed.

Furthermore, it has been confirmed that when polyurethane with a thickness of about 30 μm is used, a tubular body with a good surface can be created without noticeable overlapping steps.

<Other Examples><A> The method for producing a tubular body of the present invention is not limited to the production of tubular bodies used for fishing rods and the like.

For example, tubular bodies used for badminton shafts, golf club shafts, etc. can also be manufactured by the tubular body manufacturing method of the present invention.

<B> By selecting the hardness of the polyurethane used, it is also possible to manufacture the following tubular bodies.

That is, in the case of a tubular body that prevents slipping, such as a grip, soft polyurethane is used.

Conversely, for tubular bodies that require sliding, hard polyurethane is used.

<Effects> Since the present invention has been described above, the following effects can be expected.

<A> Polyurethane formed into a tape shape is used for taping.

This polyurethane has a very high elongation of 400-600%.

Therefore, when wrapped around prepreg, the tightening force is applied uniformly to the entire prepreg.

Therefore, air bubbles can be easily and completely expelled.

As a result, it has become possible to easily manufacture high-quality tubular bodies.

<B> Since polyurethane is used for the taping, when the resin is cured by thermosetting treatment, a polyurethane layer is formed on the surface of the resin.

This polyurethane layer is suitable as a surface protection material for resins with excellent wear resistance.

Therefore, removing the tape, polishing the surface,
There is no need for surface treatment such as painting.

As a result, the surface treatment step can be omitted, which saves time and effort.

[Brief explanation of the drawing]

FIG. 1: An explanatory diagram of an embodiment of the method for manufacturing a tubular body of the present invention, and FIGS. 2 and 3: An explanatory diagram of heat treatment conditions.

Claims (1)

[Claims] 1. A method for manufacturing a tubular body in which prepreg is wrapped around a core metal, taped thereon, and thermoset treated, in which the prepreg is taped with polyurethane, heat treated, and thermosetted with polyurethane. A method for manufacturing a tubular body, characterized by bonding resin and forming a polyurethane layer on the surface of the resin.