JPS5820780B2 - Seikei Yoji Yushigan Shinsen Ishi Tozai No Seizou Hohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a resin-impregnated fiber sheet material used as a molding raw material when press-molding a fiber-reinforced plastic, such as FRP (glass fiber-reinforced plastic) molded product.

One of the FRP molding methods is to impregnate glass fiber with unsaturated polyester resin or epoxy resin containing a curing agent, internal mold release agent, filler, coloring agent, etc. for non-stick, easy-to-handle molding. SMC method of press molding using sheet material (sheet molding compound method)
There is.

The resin-impregnated glass fiber sheet material 2 used as a molding raw material in this method is continuously produced in a sandwich-like manner between two separating films 1, 1, as shown in Fig. 1. Then, it is wound up into a roll and stored, and immediately before press molding, it is cut into an appropriate size, the separating films 1, 1 on both sides are peeled off, and then fed to a press molding machine.

Conventionally, the resin-impregnated glass fiber sheet material described above is
As shown in the figure, glass fiber e.g. glass roving 3
is cut into short fibers of a predetermined length through the gap between the cutter roll 4 and the rubber roll 5, and the separate film 1 is advanced on the conveyor belt 6 (the upper surface of which has already been coated with an impregnating resin liquid). A glass fiber mat is formed by dropping the glass fibers onto the glass fibers, and the mat is impregnated with an impregnating resin solution such as an unsaturated polyester resin or an epoxy resin by an appropriate method such as coating or spraying.

Resin-impregnated glass fiber sheet 2 manufactured by such conventional method
Most of the short glass fibers constituting it are arranged parallel to the traveling direction of the separate film 1, as shown in FIG.

Therefore, the strength of a product molded using this as a molding raw material is strong in the direction in which the short glass fibers 3' are arranged, but weak in the direction perpendicular to the direction in which the short glass fibers are arranged.

The present invention provides a method for manufacturing a resin-impregnated glass fiber sheet material that can eliminate the drawbacks of the resin-impregnated fiber sheet material manufactured by the conventional method described above. Then, the short fibers are allowed to fall and deposit on a separate film coated with an impregnating resin liquid on the top surface of the short fibers traveling at a predetermined speed to form a fiber sheet deposited layer, and the impregnating resin is applied to the thus obtained fiber sheet deposited layer. When manufacturing a resin-impregnated fiber sheet material for molding by impregnating the fibers with a liquid and laminating a separate film on the upper surface thereof, approximately half of the short fibers are cut in the direction of travel of the separate film installed below the cutting machine. By applying it to an inclined direction plate that vibrates back and forth in a certain direction and regulating its direction, it is possible to make approximately half of the short fibers that make up the fiber sheet stack layer formed on the separate film almost orthogonal to each other. This is a characteristic feature.

Hereinafter, the present invention will be explained in detail based on the drawings from FIG. 3 onwards.

FIG. 3 is a perspective view for explaining an example of a state in which the glass roving 3 is cut and dropped onto the separate film 1 in the method of the present invention.

In the method of the present invention, the glass roving 3 is cut between the cutter roll 4 (40, 4□, 43) and the rubber roll 5 (51, 5).
□, 53), the cutter roll 4 cuts the glass short fibers 3□, 3□, 33 into predetermined lengths of the separated film 1 (the upper surface of this separate film (already coated with an impregnating resin solution, such as an unsaturated polyester resin or an epoxy resin).

As shown in the figure, the cutter roll 4 and the rubber roll 5 are arranged in three stages at predetermined intervals in the direction of movement of the separate film 1 (arrow a).

That is, the cutter roll 4□ and the rubber roll 5 are arranged first, then the cut roll 4□ and the rubber roll 52, and finally the cutter roll 43 and the rubber roll 53.

The arrangement order of the cutter roll 4 and the rubber roll 5 does not have to be as described above, and can be changed as appropriate.

In the above, the length of the short glass fibers 33 cut by the cutter roll 43 is much shorter than the short glass fibers 3□ or 3□ cut by the cutter rolls 4□ or 4□ (hereinafter referred to as ultra short fibers). ) and cut into lengths approximately equal to or less than the thickness of the resin-impregnated glass fiber sheet material to be manufactured.

The short glass fibers 31 and 3 □ cut by the cutter roll 4 and the cut roll 4 □ are cut into approximately equal lengths, but they do not have to be equal lengths.

7 (70, 72, 73) are a pair of opposing inclined direction plates arranged below the cutter roll 4 and rubber roll 5 (adjusted so that the short glass fibers 30, 3□ and the glass ultrashort fibers 33 are oriented in a certain direction). The upper end is open and the lower end is close to form a slit.

An inclined direction plate 7 installed below the cutter roll 4;
can also be omitted.

Then, as explained in the conventional example of FIG. 2, most of the short fibers 3 are deposited on the separate film 1 in a direction substantially parallel to the direction in which the separate film 1 moves, as shown in FIG.

On the other hand, an inclined direction plate 7□ perpendicular to the traveling direction of the separate film 1 is installed below the counter roll 4□.

Incidentally, this inclined direction plate 7□ is caused to reciprocate in a direction perpendicular to the direction of movement of the separate film, that is, in the direction indicated by the arrow, by a suitable drive device (not shown).

Therefore, the short fibers 32 cut by the cutter roll 42 first fall onto the direction plate 7□, and most of them are oriented almost perpendicularly to the direction in which the separate film travels due to the reciprocating vibration action of the direction plate 72. Thereafter, the fibers fall onto the separate film 1, so that they fall onto the separate film 1 in a state substantially perpendicular to the short fibers 3 cut by the cutter roll 4, and are deposited thereon.

Note that in the first invention, the cutter roll 43, rubber roll 53, and direction plate 73 shown in FIG. 3 are not necessary.

A plurality of the cutter rolls 4 and 4□ described above are arranged alternately (one piece each may be used), and these cutter rolls 4 cut the long glass fibers 3 into the short fibers 31 and 3.
By cutting the short fibers 3□ into □ and regulating the direction of the short fibers 3□ with the inclined direction plate 7□, the short fibers 3□ and 3
A two-dimensional array of glass fiber sheet deposits is obtained in which the □ and □ are deposited in a state that they are substantially orthogonal to each other.

Therefore, by impregnating this glass fiber sheet deposited layer with resin and laminating the separate film 1 thereon, a resin-impregnated fiber sheet material for molding, which is sandwiched between the upper and lower separate films 1, 1, is manufactured. Ru.

In the embodiment described above, the direction plate 71 installed below the cutter roll 4 is omitted, but the direction of the short fibers 31 cut by the cutter roll 4 is more closely aligned with the traveling direction of the separate film 1. If you want to accurately regulate the direction parallel to the cutter roll 41, install the direction plate 7□ below the cutter roll 41, and vibrate the direction plate 71 back and forth in the direction parallel to the direction of movement of the separate film 1, that is, in the direction of arrow C. You can also do it.

By doing this, the short fibers 3□ first hit the direction plate 7, and due to the vibration action of the direction plate 71 in the direction of arrow C (back and forth in the direction of movement of the separate film), they are moved in a direction almost parallel to the direction of movement of the separate film. After being regulated, it falls onto the separate film 1 and is deposited thereon.

On the other hand, the short fibers 3□ cut by the cuck roll 42 are regulated and deposited in a direction perpendicular to the direction of movement of the separate film 1, so that the short fibers 31 and 32 that are orthogonal to each other are stacked in the same way as in the first invention. A resin-impregnated fiber sheet material for molding is produced, which is composed of short fiber sheets arranged two-dimensionally as shown in FIG. 4.

In this second invention, the width interval of the slits 8 formed by the lower ends of the pair of opposing inclined direction plates 7, 7 is slightly larger than the length of the short fibers 3□ cut by the cutter roll 4□. It needs to be wide.

Furthermore, in the above embodiment, as shown in FIG.
Although the pair of opposing inclined direction plates 71, 7□ are arranged parallel to the axial direction of the cutter roll 4, as shown in FIG. It is also possible to change to a plurality of direction plates 70, 71, . . . arranged in a direction perpendicular to the direction plate.

These direction plates 70. The vibration direction of γ1-... is also parallel to the direction of movement of the separate film 1, that is, the direction of arrow C.

However, in this arrangement, in terms of uniformly dispersing the short fibers 3□ in the width direction of the separate film 1, the direction plate 7□ is placed in the axial direction of the cutter roll 4° as described above.
It is inferior to the one that has been installed.

Next, other embodiments will be described.

As described above, while depositing the short fibers 3 and 3□ perpendicular to each other on the separate film 1, the cutter roll 43 further deposits the short fibers 3 and 3□ to a length much shorter than the short fibers 3 and 3□, e.g. When the ultra-short fibers 33 cut into lengths slightly shorter than the thickness of the fiber sheet material are dropped onto the separate film 1, the ultra-short fibers 33 are found to be extremely short in length and on the surface of the separate film 1. Coupled with the fact that the impregnating resin liquid is applied, the fibers fall almost vertically onto the separate film 1, and the short fibers 3□ and 32 are deposited in a perpendicular state, forming short fibers as shown in FIG. Fibers 3□, 32 and ultrashort fibers 33
A fiber sheet material with a three-dimensional array of vertical, horizontal, and vertical structures is obtained.

FIG. 3 shows a state in which the ultrashort fibers 33 are applied to a direction plate 73 (this direction plate 73 does not need to be vibrated like the direction plates 7□, 72) and then dropped onto the separate film 1. By making the slope of the direction plate 73 steeper than that of the direction plates 7□, 7□ and narrowing the width of the slit 83 formed by the lower ends of the pair of opposing direction plates 73, 73, The vertical fall of the fibers 33 can be made more effective, but even if this direction plate 73 is omitted, the ultrashort fibers 33 are extremely short in length, so most of the fibers 33 can be vertically dropped onto the separate film 1. It is possible to drop it.

The thus obtained two-dimensional or three-dimensionally arranged resin-impregnated glass fiber sheet material is molded using the molding material as a molding material, and the molded product is far superior to the one-dimensionally arrayed sheet material obtained by the conventional method. Excellent strength.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a resin-impregnated glass fiber sheet material, FIG. 2 is a perspective view for explaining a conventional manufacturing method of the sheet material, and FIG. 3 is a perspective view for explaining a manufacturing method of the sheet material according to the present invention. FIG. 4 is a model diagram showing the arrangement of glass fibers in a sheet material obtained according to the present invention, FIG. 5 is a perspective view showing another embodiment of the present invention, and FIG. 6 is a perspective view showing another embodiment of the present invention. It is a model diagram showing the glass fiber arrangement state of the sheet material obtained by the method of another example. 1 is a separate film, 2 is a resin-impregnated glass fiber sheet material, 3 is a long glass fiber, 3□, 32, 33 is a short glass fiber, 4 (41, 4□, 43) is a cutter roll, 5 (
50, 5□, 53) are rubber rolls, 6 is a conveyor bell l
-1? (7□, 7□, 73) are inclined direction plates, 81, 83
indicates a slit formed by the lower ends of the direction plates 7□, 73.

Claims (1)

[Claims] 1. The long fibers are cut into short fibers by a cutting machine, and the short fibers are allowed to fall and deposit on a ballet film whose upper surface is coated with an impregnating resin liquid at a predetermined speed, thereby forming a fiber sheet deposited layer. In the method of manufacturing a resin-impregnated fiber sheet material for molding by impregnating the obtained fiber sheet stacked layer with a resin liquid for impregnation and further laminating a separate film on the upper surface thereof, about half of the short fibers are cut under a cutting machine. The short fibers constituting the fiber sheet deposited layer formed on the separate film are applied to an inclined direction plate that vibrates reciprocatingly in a constant direction with respect to the traveling direction of the separate film installed on the screen to regulate its direction. A method for producing a resin-impregnated fiber sheet material for molding, characterized in that about half of the fiber sheet materials are made substantially orthogonal to each other.