JPS60171107A - Preparing apparatus of prepreg - Google Patents

Abstract

PURPOSE:To enable a sheet to be reused and to prevent the sheet from being impregnated unevenly with resin by equipping an air-escape roll or an air-escape plate on the upper surface of the laminated sheets between impregnation rolls and an air-escape plate under the lower surface thereof respectively. CONSTITUTION:The reinforced fibers 1 in the form of strand are supplied in parallel with each other and in the form of sheet and put on the resin surface of the lower resin carrying sheet 3. Then, the upper resin carrying sheet 7 is supplied, the resin surface side is put on the upper side of the sheetlike reinforced fiber to provide a laminated substance 8. The air-escape rolls 11-13 are equipped between the impregnation rolls 9, 9 and 10, 10, and on the upper side of the laminated substance 8 and the air-escape plates 14 is equipped on the lower side the laminated substance 8. Air in the large air reservoir is scattered to make small voids.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a prepreg manufacturing apparatus that facilitates the reuse of a sheet constituting a resin carrying sheet and prevents the occurrence of uneven resin impregnation into reinforcing fibers.

[Prior art] ' Conventionally, prepreg is made by laminating resin-carrying sheets coated with B-stage (semi-cured) resin on both sides of reinforcing fibers arranged parallel to each other in a sheet shape. The composite was passed through rolls in two stages in the transport direction of the composite and heated and pressurized to transfer and impregnate the reinforcing rate with resin.

However, in such conventional manufacturing equipment, as shown in FIG. , sheets b, b constituting the carrier sheet □
' and the prepreg C, and forms a large air pocket d between the subsequent impregnating rolls e and e'.

However, when such an air pocket d is formed, the sheets b and b' become wrinkled at that part, and the sheet b to be peeled off later.
Another drawback was that b' could not be reused.

In addition, in the air pocket d, the transfer of the resin to the reinforcing fibers was insufficient, resulting in uneven resin impregnation.

(Objective of the Invention) The object of the present invention is to disperse the air entrained in reinforcing fibers and resin-carrying sheets, to reduce the large air pockets conventionally formed between the sheet and the prepreg, and to recycle the sheet. The purpose is to enable use and prevent uneven resin impregnation.

[Structure of the invention]

The present invention, which achieves the above object, is an impregnated roll in which sheets, at least one of which is a resin-supported sheet, are superimposed on both sides of a sheet-like reinforcing fiber, and such superimposed bodies are provided in multiple stages in the direction of transport. In a prepreg manufacturing apparatus in which resin is transferred and impregnated into reinforcing fibers by heating and pressurizing, an air pocket prevention roll or an air pocket prevention plate is placed between the impregnating rolls and on the upper surface side of the stacked body, and on the lower surface side. The device is characterized in that an air pocket prevention plate is provided on each of the sides.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In FIG. 2, reinforcing fibers 1 in the form of strands are fed from a puff cage 2 through guide rolls 5 in parallel to each other and aligned in a sheet form.

On the other hand, the lower resin-carrying sheet 3 is supplied from the roll 4, and the resin surface side of the lower resin-carrying sheet 3 is first superimposed on the lower surface side of the sheet-like reinforcing fiber via the guide roll 5.

Next, the upper resin carrying sheet 7 is supplied from the roll 6 via the guide roll 5.5 in the same way, and the upper resin carrying sheet 7 and the resin side of the door are superimposed on the upper surface side of the sheet-like reinforcing fibers. A body 8 is formed. However, in the present invention, one of the two resin-carrying sheets 3 and 7 may be a sheet that does not carry resin.

Here, the reinforcing fibers 1 used in the present invention are carbon fibers, glass fibers, organic high elastic fibers such as polyaramid fibers, high strength and high elastic fibers such as silicon carbide fibers, alumina fibers, and boron fibers. Used in the form of strands. However, in the present invention, it is also possible to use materials that have been processed in advance into sheet forms such as mats and textiles.

Such reinforcing fibers may be of just one type, or two or more types of fibers may be used alternately in the width direction, such as carbon fiber and glass fiber, or carbon fiber and organic high modulus fiber. It may be used regularly or irregularly.

The base sheets of the upper and lower resin supporting sheets 7 and 3 are made of kraft paper, roll paper, glassine, etc. with a thickness of about 0.05 to 0.2 mm, and are coated with clay, starch, polyethylene, etc. on one or both sides. , a coating layer of a sealant such as polyvinyl alcohol is provided, and a silicone-based or non-silicone mold release agent is further applied on each coating layer, preferably a combination reaction of polydimethylsiloxane and polydimethylhydrodienesiloxane. It is coated with a mold release agent made of mold or addition reaction type silicone.

The resin supported on the resin support sheet is a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, a phenol resin, or a polyimide resin.

These resins are in a B-stage (semi-cured) state.

The amount of resin supported is adjusted so that the resin content of the finally obtained prepreg is 20 to 70% by weight, preferably 3() to 50% by weight. Note that it is preferable that the resin be supported on the sheet by coating.

The above-mentioned sheet also acts as a so-called release paper, and prevents the arrangement of reinforcing fibers in the prepreg from being disordered, and protects the prepreg from moisture absorption.

In the present invention, the stacked body is then fed to an impregnating roll, heated and pressurized, and the resin is transferred to and impregnated into the reinforcing fibers.

Here, the impregnating rolls are arranged in multiple stages in the direction of transport of the stack 8, for example, in two stages, as shown in more detail in FIG.
Air trap prevention rolls 11, 12 and 13 are provided on the upper surface side of the stacked body 8 between the two stages of impregnating rolls.

Although the number of air pocket prevention rolls can be selected arbitrarily, the air pocket prevention roll 13 located closest to the subsequent impregnation roll 10.10 is preferably located at the nip point 15 of that impregnation roll 10110. be placed as close as possible.

The air pocket prevention roll may be smaller than the impregnation roll in Tsutomi. In addition, in this invention, it is also possible to replace with the said air pocket prevention roll and install the same thing as the air pocket prevention board 14 mentioned later.

The impregnating rolls are used to spread reinforcing fibers in the form of strands and impregnate them with resin.At least one of the pair of rolls constituting each impregnating roll has an
It is heated to -180°C, preferably 90 to 150°C. Further, the pressing force is several kilograms per 1 cm as a linear pressure.

Furthermore, in the present invention, an air pocket prevention plate 14 is provided on the lower surface side of the stacked body 8 and at a position corresponding to the air pocket prevention rolls 11, 12, and 13, and heated by the impregnating roll 9.9. The pressure-treated stack 8 is guided by an air pocket prevention plate 14 and pressed by air pocket prevention rolls 11, 12 and 13.

In the present invention, impregnating rolls may be provided in three or four stages, and an air pocket prevention roll and an air pocket prevention plate may be provided between each of these impregnation rolls, respectively, as described above.

In the obtained unidirectional prepreg 15, the sheet 21 constituting the upper resin-carrying sheet 7 is peeled off as a roll 16 via the guide roll 5, and then, if necessary,
The scrim cloth 18 supplied from the scrim cloth supply roll 17 via the guide roll 5 is bonded to the peeled surface, heated and pressurized by scrim cloth bonding rolls 19 and 19, and then wound up as a roll 20.

Note that the slim cloth 18 is made by plain weaving or satin weaving the above-mentioned reinforcing fibers, and when it is made of carbon fiber or organic high elastic fiber, the thickness is 0.02 to 0.15 mm, preferably 0.02 mm. 02~0.05+++m, basis weight 10~90
g/n? and when it is made of glass fiber, the thickness is 0.01 to 0.1 mm+, preferably 0.0
2 to 0.05 mm, basis weight 10 to 80 g/cd, preferably 20 to 50 g/rrr.

The scrim cloth provides strength in the width direction to the unidirectional prepreg and can prevent the arrangement of reinforcing fibers from becoming disordered.・Scrim cloth pasting roll 1
9.19 is a temperature of 50-130°C, preferably 70-1
It is heated to 20°C, and the pressure is several kg/cm as a linear pressure.
That's about it.

The obtained unidirectional prepreg 15 has a thickness of 0.02 to 1
vata s is preferably 0.03 to 0.5 +++ m and contains 30 to 80% by weight, preferably 50 to 70% by weight of reinforcing fibers.

〔Effect of the invention〕

As described above, according to the present invention, between the impregnating rolls provided in multiple stages, an air pocket prevention roll or an air pocket prevention plate is provided on the upper surface side of the stacked body, and an air pocket prevention plate is provided on the lower surface side. The stacked body is guided between the impregnation rolls by the air trap prevention plate on the lower side and is pressed by the air trap prevention roll or the air trap prevention plate on the upper side.

As a result, the air in the large air pocket formed by the preceding impregnation roll is dispersed into small air pockets.

Therefore, unlike in the past, the sheet does not wrinkle due to large air pockets formed by air trapped between the sheet forming the resin support sheet and the prepreg, and the sheet can be reused after being peeled off. become. Furthermore, since the air pockets become smaller, it is also possible to prevent uneven impregnation of the reinforcing fibers with the resin.

[Brief explanation of the drawing]

FIG. 1 is a partial side view showing how air pockets are generated in a conventional prepreg manufacturing apparatus, FIG. 2 is a schematic side view showing an embodiment of the present invention, and FIG. 3 is a side view of essential parts thereof. l-・-Reinforcing fiber, 2-Lower resin support sheet, 7-・Upper resin support sheet, 8-Layered body, 9, 1O-・Impregnation roll, 11.12.13-Air trap prevention roll, 14
-Air pocket prevention plate. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita

Claims (1)

[Claims] A sheet, at least one of which is a resin-supporting sheet, is superimposed on both sides of a sheet-shaped reinforcing fiber, and the superimposed body is heated and pressurized using impregnating rolls provided in four stages in the direction of transport to transfer the resin to the reinforcing fiber. Transferred to □, in an apparatus for manufacturing prepreg to be impregnated, an air trap prevention roll or an air trap prevention plate is provided between the impregnating rolls and on the upper surface side of the stacked body, and an air trap prevention plate is provided on the lower surface side. A prepreg manufacturing device characterized by the following.