JPH05338046A - Method and apparatus for successively forming continuous frp article - Google Patents

Abstract

PURPOSE:To manufacture articles having surface gloss successively by moving a mold at a speed synchronized to a drawn molding and thermally curing at the moving process in the case of molding reinforcing fiber impregnated with a thermosetting resin in a manner passing through a heated drawing mold. CONSTITUTION:On the side surface parts of double belt conveyers 1A, 1B, forming plates 2...2 are provided that regulate the configuration of an article in its width direction, and heating devices 3, 3 are provided on the opposite parts 1A, 1B and, further, a support frame 3A and a support table 3B are provided therefor. The forming plates 2...2 are made up such that they are divided in its peripheral direction and formed to be a series of forming plates in its linear part. On the tip-end part of each forming plate 2...2, a heat resistance sealing rubber is provided. Continuous fiber P impregnated with resin is supplied between double conveyers 1A, 1B traveling at a speed synchronized thereto and the cross-sectional configuration is regulated by both the conveyers 1A, 1B and forming plates 2...2 and thus it is moved as being cured by heating. Accordingly, there never occurs a relative movement between the continuous fiber P impregnated with resin and the forming plates 2...2 and thus it is molded in a state of no friction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous molding method and apparatus for long FRP products, and more particularly to a continuous molding method and apparatus for long FRP products having a very smooth surface.

[0002]

2. Description of the Related Art Conventionally, in the case of continuously molding a long FRP product, for example, a long FRP product made of fiber reinforced phenolic resin, a long fiber P is drawn into a drawing die K as shown in FIG. The thermosetting resin F is press-fitted into K to impregnate it,
Then, a pultrusion molding method is known in which a predetermined cross section is molded and cured while being heated by a heater H to be molded, and then cut into a predetermined length to obtain a molded product G.

[0003]

[Problems of the prior art] When the above-mentioned pultrusion process is performed, the resin P gradually hardens while sliding on the inner surface of the mold K. Due to the correlation, it is impossible to prevent a certain amount of frictional resistance from occurring, and therefore microscopically-like scale-like cracks are formed on the surface of the molded product, which impedes the smoothness of the surface of the molded product and There is a problem that it is technically difficult to make the glossy surface. Therefore, when it is desired to make the surface of this kind of product have a glossy surface such as a glass surface, there is a problem that the secondary makeup treatment cannot be omitted and the treatment steps increase.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to obtain a continuous molding method and apparatus for a long FRP product having a very excellent glossy surface even though it is continuous molding by pultrusion molding. It was made as.

[0005]

That is, in the continuous molding method for a long FRP product, which is the first invention of the present invention, the reinforcing fiber impregnated with the thermosetting resin is passed through a heated drawing die to be molded. In this case, the mold is moved at a speed synchronized with the pultrusion molding body, and is heat-cured in the moving process.

A second aspect of the present invention is an apparatus for carrying out the above method, which is a double conveyor arranged facing each other, wherein a side plate of the double belt conveyor is provided with a template for regulating the shape in the product width direction, The double conveyor is characterized in that a heating device for heating the thermosetting resin to a temperature required to cure the thermosetting resin is provided at least at the facing portion.

A third aspect of the present invention is an apparatus for the same purpose as the second aspect of the invention, in which a short block-shaped die having a U-shaped cross section is attached to the outer surface of the belt conveyor in series with the open surface thereof as the outer diameter direction. The belt conveyor is provided with a heating device that heats the thermosetting resin to a temperature required for curing, and a lid is attached to the open surface of each of the short block-shaped molds by a hinge. A lid closing belt for moving the belt conveyor at a synchronous speed to engage with a free end of the lid body and fixedly supports the lid body in a closed position is disposed in a straight running portion of the conveyor. Is to

[0008]

In the present invention, the resin of the long FRP product is a thermosetting resin, and it is premised that the resin is cured by heating with a mold. When fibers are impregnated with such a resin and the mold is continuously molded and cured, the friction between the product and the mold becomes zero if the mold is moved at a speed synchronized with the product in the process of curing the resin. As a result, a molded article having a very glossy surface such as a glass surface can be molded. In this molding method, the time when the friction between the mold and the molded product is zero may be immediately before the resin is completely cured, but the mold may be moved at the synchronous speed from the time when the resin is supplied to the mold.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a side view of an apparatus according to an embodiment of the second invention, and FIG. 2 is AA of FIG.
FIG. 3 is a side view of another embodiment, taken along the line.

In FIG. 1, a continuous forming apparatus A for a long FRP product according to the present invention is a double conveyor 1A, 1B in which steel conveyors are arranged facing each other, and a product width is provided on a side surface of the double belt conveyor 1A, 1B. 2 are provided to regulate the directional shape, and the double conveyor is provided with heating devices 3 and 3 for heating at least the facing portions 1A and 1B to a temperature required to cure the thermosetting resin. It is configured. In the figure, 3A is a supporting frame for the heating device 3 and each double conveyor 1A, 1B, and 3B is each double conveyor 1
The support table of A and 1B is shown.

In the above embodiment, the template plates 2 ... 2 are formed in a circumferentially divided shape so as not to hinder the running of the belt conveyor 1A, and are configured so as to form a series of template plates in the straight line portion. Further, as shown in FIG. 2, a seal rubber 2A made of heat resistant rubber is provided at the tip of each template 2 ... 2 to seal the gap between the conveyors facing each other.

2 shows the case where the templates 2 ... 2 are provided on one conveyor 1A, but as shown in FIG. 3, they are provided on both the conveyors 1A and 1B and face each other to form one template 2 ... 2 may be provided on the side of the conveyor 1B, which is the reverse of FIG. 1, although not shown.

The resin-impregnated long fiber P is supplied between the double conveyors 1A and 1B which are run at a synchronized speed, and the cross-sectional shape is regulated by both the conveyors 1A and 1B and the mold plates 2 ... While moving, both conveyors 1A and 1B move at the same time. Therefore, the resin-impregnated long fiber P and the mold 2 ...
It is molded in a frictionless state with no relative movement with respect to 2.

FIG. 4 is a side view of the apparatus of the third embodiment, and FIG. 5 is a sectional view taken along line BB of FIG. Long FRP in FIG.
In the product continuous forming apparatus A, a short block-shaped mold 4 having a U-shaped cross section is attached to the outer surface of the belt conveyor 1 made of steel in series with the open surface 4A as the outer diameter direction. The conveyor 1 is provided with a heating device 3 that heats the thermosetting resin to a temperature required for curing, and a lid 5 is attached to the open surface 4A of each short block-shaped die 4 by a hinge 5A. A belt 6 for closing the lid is arranged in the straight running portion of the belt conveyor 1 so as to move at the same speed as the belt conveyor 1 and engage with the free end 5B of the lid 5 to fix and support the lid 5 in the closed position. It is configured. In the figure, 4B is a seal rubber made of heat-resistant rubber that seals a gap with the lid 5, and 6B is a guide of the lid closing belt 6.

The resin-impregnated long fibers P are supplied to the belt conveyor 1 traveling at a synchronized speed, but at the starting point, the lid 5 is in an open state, and the resin-impregnated long fibers P are At a position along the straight line portion of the belt conveyor 1, the free end 5A of the lid body 5 engages with the lid closing belt 6, and the lid body 5 is closed. In this state, the molds 4 ... 4 move in series at a synchronous speed, and during this period, the resin-impregnated long fibers P are molded and cured without friction. Then, the lid closing belt 6 is disengaged from the lid body 5 at the position where the linear portion of the belt conveyor 1 is finished, so that the lid body 5 is opened and only the molded product G is taken out. Further, the molds 4 ... 4 move to their original positions again.

When the phenol resin-impregnated long fiber was pultrusion-molded by the above-mentioned apparatus, a molded product having a smooth surface like a mirror surface could be molded at one time.

[0017]

As described above, according to the method of the present invention, when a long FRP product made of a thermosetting resin is molded, the relative speed between the mold and the product can be molded at zero, so that the surface gloss can be improved. It is possible to manufacture a product continuously.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus according to an embodiment of the second invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view of another embodiment.

FIG. 4 is a side view of an apparatus according to an embodiment of the third invention.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is an explanatory cross-sectional view of a conventional example.

[Explanation of symbols]

 A Continuous molding equipment for long FRP products A 1A, 1B Double conveyor 1 Belt conveyor 2 Template 3 Heating device 4 Short block mold 4A Open surface 5 Lid 5A Hinge 5B Lid free end 6 Lid closing belt

Claims (3)

[Claims] 1. When a reinforcing fiber impregnated with a thermosetting resin is drawn through a heated drawing mold to be molded, the mold is moved at a speed synchronized with the drawing body, and heat-cured during the moving process. A method for continuously forming a long FRP product, characterized by: 2. A double conveyor arranged facing each other, wherein a template for restricting a shape in the product width direction is provided on a side surface of the double belt conveyor, and the double conveyor has at least a facing portion, a thermosetting resin. A continuous molding device for a long FRP product, which is provided with a heating device for heating the resin to a temperature required for curing. 3. A short block-shaped mold having a U-shaped cross section is attached to the outer surface of the belt conveyor in series with the open surface thereof as the outer diameter direction, and is required to cure the thermosetting resin on the belt conveyor. A heating device for heating to various temperatures is provided, and a lid is attached to the open surface of each of the short block-shaped molds by a hinge, and a linear traveling portion of the belt conveyor moves at the same speed as the belt conveyor. And a lid closing belt which is engaged with the free end of the lid and fixedly supports the lid at a closed position, the continuous molding apparatus for a long FRP product.