JPS583832A - Manufacturing apparatus of fiber reinforced resin sheet - Google Patents

Abstract

PURPOSE:To eliminate the flow of resin into a passage of a fiber sheet and prevent the deformation and break of the fiber sheet, by making a clearance of the passage of the fiber sheet shaped in a crosshead die adjustable in accordance with the thickness of the fiber sheet. CONSTITUTION:A fiber sheet 5 heated at higher than a temperature of a molten resin is introduced into a passage 14 of the fiber sheet and impregnated with the molten resin in an impregnating chamber 12 which is filled with the molten resin supplied from a passage 11 of a resin liquid, guided out from a slit 13 as a resin impregnated sheet 7 and the resin is cooled, solidified by a cooling roll. Because the clearance of a narrow part 14a shaped at a lower part of the passage 14 of the fiber sheet is adjusted by adjusting bolts 15 to be nearly the same as the thicknes of the fiber sheet 5, the molten resin in the impregnating chamber 12 does not flow into the passage 14 of the fiber sheet, a pressure of the molten resin in the impregnating chamber 12 is maintained and the fiber sheet 5 in the impregnating chamber 12 is sufficiently impregnated with the molten resin.

Description

[Detailed description of the invention] The present invention relates to an apparatus for manufacturing fiber-reinforced resin sheets.

BACKGROUND ART Fiber-reinforced resin sheets obtained by impregnating fiber sheets such as woven fabrics and non-woven fabrics made of inorganic fibers such as glass fibers with resin are widely used as various equipment materials and building materials. As methods for producing the above-mentioned fiber-reinforced resin sheets, methods such as immersing a fiber sheet in a resin solution and coating a resin solution on the fiber sheet are known. The manufacturing process is complicated, requiring complicated processes and equipment such as manufacturing, solidifying the resin, and removing and recovering the solvent. On the other hand, a method is known in which a molten resin is coated on the fiber sheet surface using a roller coater or the like and then cooled. However, in this known method, the resin is difficult to penetrate into the structure of the fiber sheet, so the adhesiveness of the resin is There were problems such as poor performance and low productivity.

In order to solve the problems of these known manufacturing methods, a fiber sheet passage is provided in the RAD die to the cross for forming the molten resin into a sheet, and the fiber sheet passing through the fiber sheet passage is transferred to the cross in the RAD die to melt the molten resin. A method of impregnating the material has been attempted.

In this trial method, when using a conventional cloth rad die, the viscosity of the molten resin liquid was high, so the resin did not penetrate into the fiber sheet, and the adhesion between the resin and the fiber sheet is insufficient, making it impossible to obtain a satisfactory fiber-reinforced resin sheet.

Therefore, when trying to improve the penetration of the resin into the fiber sheet by narrowing the gap between the slits in the cross-layer die and increasing the resin pressure inside the cross-layer die, the surface of the fiber sheet was not smooth, and the molten resin and fibers Due to insufficient sealing performance at the meeting point with the sheet, the molten resin flows into the fiber sheet passage, causing the fiber sheet to wrinkle or clogging the fiber sheet passage, resulting in deformation or breakage of the fiber sheet. It has been difficult to industrially produce fiber-reinforced resin sheets using ordinary cloth rad-dying. In addition, in the above device,
When using fiber sheets of different thicknesses, it was necessary to replace the rad die with a cloth one.

As a result of intensive research aimed at solving the above-mentioned problems, the present inventors came to invent an apparatus for producing fiber-reinforced resin sheets that can be produced industrially. ,.

That is, the present invention provides an apparatus for manufacturing a fiber reinforced resin sheet by coating and impregnating a fiber sheet with a molten resin using a cross rad die. This is a fiber-reinforced resin sheet manufacturing apparatus characterized in that the fiber-reinforced resin sheet can be adjusted so that molten resin does not flow into the fiber sheet passage.

An overview of the fiber reinforced resin sheet manufacturing apparatus of the present invention will be explained below with reference to FIG.

A fiber sheet heating device 2 is arranged above the cross-layer rad die 1, and a pair of cooling rollers 3 are arranged below the cross-layer rad die 1. The fiber sheet 5 wound around the fiber sheet row A/4 is supplied to the fiber sheet heating device 2 through the guide roller 6, heated to a temperature higher than the temperature of the molten resin, and then melted into the fiber sheet 5 in the RAD die 1 to the cross. The resin-impregnated sheet 7 is cooled by the cooling roller 3 to form a fiber-reinforced resin sheet 8.
is formed and wound onto the resin sheet row/L'IO via the guide roller 9.9.

Next, an embodiment of the structure of the cross-to-rad die I of the present invention will be described with reference to FIG. The cross-to-rad die 1 is formed by overlapping two die bodies 1a and 1b, and an impregnation chamber 12 communicating with a resin liquid passage 11 is provided at the bottom of the overlapping part.
and a sleeve) 1B are formed, and a fiber sheet passage 14 is communicated with the upper part of the impregnation chamber 12. The die body 1b has a gap between it and the other die body 1a, that is, an impregnation chamber 12, a sleeve) 1B, and a fiber sheet passage 1, by an adjustment bolt 15 attached to a frame 1a that supports the die body 1b.
Adjustably move the gap between 4 and 4. Further, the gap between the slits 18 can be adjusted using a lip adjustment button 17 of a die lip 16 provided at the lower part of the die body 1a.

In the apparatus having the above structure, the fiber sheet 5 heated to a temperature higher than the temperature of the molten resin by the fiber sheet heating device 2 is introduced into the fiber sheet passage 14, and the impregnation chamber is filled with the molten resin supplied from the resin liquid passage 11. The sheet is impregnated with molten resin at 12, and is led out as a resin-impregnated sheet 7 through the slit 8, and the resin is cooled and solidified by the cooling roller 8. In this case, the narrow part 1 formed at the bottom of the fiber sheet passage 14
Since the gap 4a is adjusted to be approximately the same as the thickness of the fiber sheet 5 by the adjustment pole 15, the impregnation chamber 1
The molten resin in the fiber sheet 5 does not flow into the fiber sheet passage 14Vc, and the pressure of the molten resin in the impregnation chamber 12 is maintained, so that the fiber sheet 5 in the impregnation chamber 12 is sufficiently impregnated with the molten resin. .

The amount of molten resin impregnated and coated on the fiber sheet 5 is set by moving the die lip 16 with the lip adjustment bolt 17 and adjusting the gap between the 1 g of sleeves.

As explained above, the gap between the narrow portions 14a formed at the bottom of the fiber sheet passage 14 is adjusted to be almost the same as the thickness of the fiber sheet, but in the case of a high bulk fiber sheet with a low bulk density. The gap is adjusted to be slightly smaller than the thickness of the fiber sheet so as not to reduce the sealing performance of the fiber sheet passage. Normally, it is sufficient that the adjustment range of the gap between the narrow portions of the fiber sheet passage is 10 fl or less.

In the above structure, the die body 11) also has the slit 1
A movable die lip may be provided to adjust the gap between the two.

To supply the molten resin to the resin liquid passage 11, an ordinary melt extrusion device is used, but it may also be pumped from a storage tank containing the molten resin using a gear pump or the like. Moreover, the fiber sheet heating device 2 for heating the fiber sheet 5 is made of resin of type 1. It may be omitted depending on the amount of impregnation, the thickness of the fiber sheet, etc.

The fiber sheet applied to the device of this invention is made of inorganic fibers such as glass fiber, carbon fiber, silica fiber, metal fiber, etc., and the shape of the fiber sheet is woven, knitted, nonwoven, and blind weave mainly made of warp yarns. ), etc., and these fiber sheets are one or multiple sheets laminated.

As the resin impregnated into the fiber sheet, thermoplastic resins such as polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride, polyurethane, and thermosetting resins are used.

Furthermore, these resins may be blended with additives such as modifiers and fillers.

Examples of use of the manufacturing apparatus of the present invention will be described below.

Usage Example 1 Using the manufacturing equipment shown in Fig. 1 without the fiber sheet heating device, a glass fiber plain woven fabric with a basis weight of 47% and a thickness of 0.0581 fl (60 warp threads/25.4 ml, weft threads 46
25.411jf) was introduced at a speed of 1 m1 into a cloth in which the gap between the narrow parts of the fiber sheet passage was set to 0.06 ff. On the other hand, a molten resin made by heating and melting polyethylene terephthalate having an intrinsic viscosity of 0.65 at 300°C using an extruder was supplied from the resin liquid passage to the impregnation chamber to impregnate the fiber sheet, and the gap between the slits was adjusted to 0.2H. A resin-impregnated sheet was formed, which was cooled with a cooling roller at a temperature of 5 (L), and then wound onto a winding roll to produce a glass fiber reinforced polyester resin sheet. During this resin sheet manufacturing process, the glass fiber sheet was deformed. There was no breakage, and the obtained resin sheet was a homogeneous sheet with good resin adhesion.

Usage Example 2 Using the manufacturing equipment shown in Figure 1, we produced 820 m of Ga'F Sma'7F with a date weight of 450% and a thickness of 0.951'll.
The polyester resin was passed through a heated heating device, and put into a cloth with a gap of 1.011 II in the narrow part of the fiber sheet passage at a speed of 1 m/min. A glass fiber-reinforced polyester resin sheet having a thickness of i and o tm was produced by impregnating the resin with the following materials and cooling it. There was no deformation or breakage of the glass fiber sheet in this resin sheet manufacturing process, and the obtained resin sheet was a homogeneous sheet.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of the manufacturing apparatus of the present invention, and FIG.
The figure is a vertical cut front view of an embodiment of the cross-to-rad die of the present invention. 1: Lad die to cloth, 2: Fiber sheet heating device, 5:
Fiber sheet, 11: resin liquid passage, 14: fiber sheet passage, 14a: narrow part. Patent Applicant Toyobo Co., Ltd. Agent Patent Attorney Takeo Sakano Ryoji Yoshida

Claims (1)

[Scope of Claims] [1] In an apparatus for manufacturing a fiber-reinforced resin sheet by coating and impregnating a fiber sheet with molten resin using a cross-head die, the gap between the fiber sheet passages formed in the cross-head die is filled with the fiber sheet. 1. An apparatus for producing a fiber-reinforced resin sheet, which is adjustable according to the thickness of the fiber-reinforced resin sheet, and is configured to prevent molten resin from flowing into the fiber sheet passageway. [2] The apparatus for producing a fiber-reinforced resin sheet according to claim 1, further comprising a fiber sheet heating device for heating the fiber sheet to a temperature higher than the molten resin temperature above the cross-layer die.