JPH04810B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for molding a plate-shaped synthetic resin molded product reinforced with fibers, and its purpose is to obtain a molded product with excellent strength through smooth operation. be.

(Prior art and its problems) Conventionally, injection molding has been a typical method for forming plate-shaped synthetic resin molded products reinforced with fibers.
In this injection molding method, molding is performed by injecting a molten synthetic resin molding material mixed with reinforcing fibers into meshed molds.

However, in this injection molding method, it is necessary to fill the narrow mold with the synthetic resin material in a hot molten state from the injection nozzle of the mold, so the diameter of the injection nozzle must be made small, which makes the injection nozzle easily clogged. Become.

Therefore, in order to prevent this nozzle clogging, it is necessary to shorten the reinforcing fibers and reduce the amount of reinforcing fibers mixed in, but the molded product formed in this way cannot have sufficient strength.

On the other hand, in the injection molding method, it is possible to inject long reinforcing fibers into the mold in advance and then inject the synthetic resin material from the injection nozzle, but the reinforcing fibers may partially gather due to the injection pressure and mold the mold. This hindered the flow of the synthetic resin material within the mold, making molding impossible.

(Means for Solving the Problem) In this invention, a plurality of reinforcing fibers are bundled with powder interposed between them, and this is coated with a flexible thermoplastic synthetic resin coating to form a reinforcing wire material. Reinforcing wires are knitted to form a flat reinforcing body, this reinforcing body is placed in a mold, and the molds are engaged while a thermoplastic synthetic resin molding material is injected into the mold in a hot molten state from an injection nozzle. All of the above problems are solved by providing a method for molding a plate-shaped synthetic resin molded product, which is characterized in that the reinforcing body is integrally embedded in a plate-shaped synthetic resin molded product molded from this synthetic resin molding material. do.

(Example) An example of the present invention will be described based on the drawings.

Fig. 1 is an explanatory diagram of a reinforcing body used in a molding method according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same molding method, and Fig. 3 is a plate-shaped synthetic resin molded product obtained by the same molding method. FIG. 4 is an explanatory diagram of a heated toilet seat to which this molded product is applied.

In the figure, 1 indicates a reinforcing body.

This reinforcing body 1 has a reinforcing wire 2 as shown in FIG.
It is woven vertically and horizontally to create a flat shape. The reinforcing wire 2 may be woven in other ways.

The reinforcing wire 2 is constructed by bundling a plurality of reinforcing fibers 3 and covering the bundle with a flexible thermoplastic synthetic resin coating 4.

Powder 5 is interposed between each reinforcing fiber 3.

Carbon fibers are preferably used as the reinforcing fibers 3, and instead of them, materials commonly used for fiber-reinforced plastics, such as glass fibers, may also be used.

As the carbon fiber, both pitch type and polyacrylonitrile type carbon fibers are preferably used.

As the synthetic resin coating 4, ABS resin (acrylonitrile-butadiene-styrene copolymer resin),
Thermoplastic resins such as polystyrene resin and polyester resin are preferably used, but it is most desirable to use the same material as the synthetic resin molding material 6 described later.

As the powder 5, the thermoplastic resins listed as those used for the synthetic resin coating 4 are preferably used, and inorganic powders or thermosetting resin powders may also be used instead, but these will be described later. It is most desirable to use the same material as the synthetic resin molding material 6.

A molding method according to an embodiment of the present invention using such a reinforcing body 1 is shown in the order of steps in FIGS. 2(A) to 2(D).

As shown in FIG. 2(A), the reinforcing body 1 is placed in the lower mold 8 of the mold 7. Note that the reinforcing body 1 does not necessarily have to be placed within the lower mold 8; molding can also be carried out by temporarily fixing it to the upper mold 9, or by placing it in tension between the upper mold 9 and the lower mold 8. It is.

As shown in FIG. 2(B), while injecting the synthetic resin molding material 6 in a hot molten state into the lower mold 8 through the injection nozzle 11, the lower mold 8 and the shear edge are attached as shown in FIG. 2(C). The upper mold 9 is engaged with the upper mold 9, and the fluidized synthetic resin molding material 6 is spread to every corner of the mold 7 by the pressure.

As shown in FIG. 2(D), the upper mold 9 is separated from the lower mold 8, and the plate-shaped synthetic resin molded product 10 inside the lower mold 8 is taken out.

The plate-shaped synthetic resin molded product 10 is as shown in FIG. 3 when viewed from above, and as shown in FIG. 2(D), the reinforcing body 1 is embedded integrally in the plate-shaped synthetic resin molded product 14. Note that the plate-shaped synthetic resin molded product 10 may be molded so as to be embedded not in the plate-shaped synthetic resin molded body 14 but on the surface of the plate-shaped synthetic resin molded body 14.

In such a molding method, a flat reinforcing body 1 made of woven reinforcing wire material 2 is placed in the lower mold 8, so that
As shown in FIG. 2(B), the injection nozzle 11 is not clogged when the synthetic resin molding material 6 is injected.

In addition, the synthetic resin molding material 6 in a fluid state is placed in a mold 7.
When the reinforcing body 1 is pushed out to every corner, the reinforcing body 1 is not biased or distorted due to the fluid pressure.

Plate-shaped synthetic resin molded product 1 obtained in this way
0, since the synthetic resin coating 4 and the synthetic resin molding material 6 are both thermoplastic resins, the synthetic resin coating 4 and the synthetic resin molding material 6 are both thermoplastic resins. The wettability and adhesion of the synthetic resin molding material 6 to the resin coating 4 are good, and the reinforcing body 1 reliably adheres to the surroundings in the plate-shaped synthetic resin molded body 14.

In addition, since the reinforcing body 1 is constructed by knitting reinforcing wires 2, the overall strength is increased, and
The dispersed state of the reinforcing wire rod 2 becomes uniform.

Furthermore, since the powder 5 is interposed between the reinforcing fibers 3 constituting the reinforcing body 1, there is a certain amount of room for misalignment between the reinforcing fibers 3, so that the reinforcing wire 2 can remain flexible.

Incidentally, FIG. 4 shows a heated toilet seat, which is a type of plate-shaped synthetic resin molded product 10 molded using this molding method, and in this molding method of the heated toilet seat 12, carbon fiber is used as the reinforcing fiber 3. used as a synthetic resin coating 4, a synthetic resin molding material 6, and a powder 5.
ABS resin or polystyrene resin is used.

At both ends of the reinforcing body 1, carbon fibers serving as the reinforcing fibers 3 are tied together and terminals 13 for conducting electricity are connected.

The heated toilet seat 12 obtained in this manner not only has increased strength, but even if cracks or the like occur, the carbon fibers are covered with the synthetic resin coating 4, so the carbon fibers will not be exposed and will not cause electric shock. There is no danger of

(Effects of the Invention) This invention involves bundling a plurality of reinforcing fibers with powder interposed between them, covering them with a flexible thermoplastic synthetic resin coating to make a reinforcing wire, and knitting this reinforcing wire. This reinforcing body is placed in a mold, and the molds are engaged with each other while injecting a thermoplastic synthetic resin molding material in a hot molten state from an injection nozzle into the mold. This method of molding a plate-like synthetic resin molded product is characterized by embedding the reinforcing body integrally in a plate-like synthetic resin molded product molded from a molding material, so that the following effects can be achieved.

In other words, since a flat reinforcing body made of woven reinforcing wire is used, there is no deviation or distortion in the mold due to the flow pressure of the synthetic resin material, and the flow of the synthetic resin material is not hindered, allowing smooth molding work. can be done.

Since both the synthetic resin coating and the synthetic resin molding material are thermoplastic resins, the synthetic resin coating reliably adheres to the surrounding synthetic resin molded article, and the strength of the molded article can be more reliably strengthened.

Since the reinforcing body is constructed by knitting reinforcing wires, the overall strength of the molded product increases, and the reinforcing wires are uniformly distributed, resulting in a uniform strength distribution of the molded product.

Since the powder is interposed between the reinforcing fibers, there is a certain amount of room for misalignment between the reinforcing fibers, allowing the reinforcing wire and ultimately the molded product to remain flexible and improve brittleness.

[Brief explanation of drawings]

Fig. 1 is a plan view of a reinforcing body used in a molding method according to an embodiment of the present invention, Figs. FIG. 4 is a plan view of a heated toilet seat obtained by this molding method. DESCRIPTION OF SYMBOLS 1...Reinforcement body, 2...Reinforcement wire, 3...Reinforcement fiber, 4...Synthetic resin coating, 5...Synthetic resin molding material, 7...Mold, 10...Plate-shaped synthetic resin molded product,
11...Injection nozzle.

Claims (1)

[Claims] 1. Bundle a plurality of reinforcing fibers with powder interposed between them, cover this with a flexible thermoplastic synthetic resin film to make a reinforcing wire, and knit this reinforcing wire to make a flat reinforcing body, This reinforcing body is placed in a mold, and the molds are engaged with each other while injecting a thermoplastic synthetic resin molding material in a hot molten state from an injection nozzle into the mold, and a plate is formed from this synthetic resin molding material. 1. A method for molding a plate-shaped synthetic resin molded article, comprising embedding the reinforcing body integrally in a shaped synthetic resin molded article.