JPH04366627A - Fiber-reinforced sheet - Google Patents

Abstract

PURPOSE:To obtain a fiber-reinforced sheet in which continuous reinforcing fibers arrayed in one direction are kept in their predetermined positions without moving when said sheet is formed. CONSTITUTION:Fiber-reinforced resin layers (b), in which reinforcing fibers f5 with a length of 5mm or longer are arranged in a thermoplastic resin B in a state random in the lengthwise direction of the reinforcing fibers, are integrally laminated in the form of sandwiches on both faces of a fiber- reinforced resin layer (a), in which continuous reinforcing fibers F3 are arranged in a thermoplastic resin A in a state arrayed in one direction, via net-like reinforcing materials N, respectively.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a strong plate material,
In so-called stampable sheets, which are materials for press molding to obtain various products, it is used to stamp molded parts that require mechanical strength in one direction, such as reinforcing materials for automobile bumpers and reinforcing materials for doors. The present invention relates to a fiber-reinforced sheet suitable for and a method for manufacturing the same.

0002

BACKGROUND OF THE INVENTION As a fiber-reinforced sheet, a sheet made by impregnating a thermoplastic resin into a laminate of reinforced long fibers aligned in one direction and a long fiber mat is known (Japanese Unexamined Patent Application Publication No. 1983-1992-1). (See Publication No. 240514).

0003

[Problems to be Solved by the Invention] In the conventional fiber-reinforced sheet described above, a laminate of reinforced long fibers aligned in one direction and a long fiber mat is impregnated with the same thermoplastic resin. When this sheet is press-molded, the thermoplastic resin of the long fiber reinforced layer aligned in one direction flows considerably like the thermoplastic resin of the long fiber mat reinforced layer. As a result, the long fibers in the actual molded product are not aligned in the desired direction, resulting in a partial decrease in mechanical strength. In addition, there is a problem in that the location and degree of the decrease vary, making it impossible to control it.

[0004] The object of the present invention is to provide fibers in which continuous reinforcing fibers aligned in one direction do not flow during molding and maintain a predetermined position, so that a molded product can be formed that is sufficiently and uniformly reinforced in a desired direction. Our goal is to provide reinforced sheets.

[0005]

[Means for Solving the Problems] The fiber-reinforced sheet according to the present invention has a fiber-reinforced resin layer (A) in which continuous reinforcing fibers are arranged in one direction in a thermoplastic resin (A).
and a fiber-reinforced resin layer (I) in which reinforcing fibers with a length of 5 mm or more are arranged randomly in the longitudinal direction of the thermoplastic resin (B) are laminated and integrated via a net-like reinforcing material. It is what it is.

[0006] The length of the reinforcing fibers in the fiber reinforced resin layer (i) is preferably 5 to 100 mm, particularly 5 to 50 mm. 5
If it is less than mm, there is no reinforcing effect on the fibers.

[0007] As the reinforcing fibers, fibers that are thermally stable at the melting temperature of the thermoplastic resin used are used. Specifically, organic fibers such as glass fiber, carbon fiber, silicon/titanium/carbon fiber, boron fiber, fine metal fiber, aramid fiber, liquid crystal polymer fiber, polyester fiber, and polyamide fiber can be mentioned.

[0008] The monofilament preferably has a diameter of 1 to 50 μm. It is not necessary to use a sizing agent when forming a reinforcing fiber bundle from a large number of continuous filaments, but if it is used, if the amount of the sizing agent attached exceeds 1% by weight,
It becomes difficult to separate the fiber bundle into monofilament units in the fluidized bed, and the impregnation of the thermoplastic resin between the monofilaments is reduced.

[0009] The reinforcing fiber bundle is in the form of a strand or roving composed of several hundred to several thousand continuous monofilaments. This reinforcing fiber bundle is determined by considering the width, thickness, manufacturing speed, etc. of the fiber reinforced sheet to be manufactured.
Usually used in parallel.

The reinforcing fibers in the fiber-reinforced resin layer (A) and the reinforcing fibers in the fiber-reinforced resin layer (B) may be of the same kind or different kinds, and their content ratio also depends on the mechanical strength and sheet strength. It is determined as appropriate depending on the shape of the molded product to be molded.

As the thermoplastic resins (A) and (B), any resin that melts and softens when heated can be used. for example,
polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyethylene terephthalate,
Polybutylene terephthalate, polycarbonate, polyvinylidene fluoride, polyphenylene sulfide, polyphenylene oxide, polyether sulfone, polyether ether ketone, etc. are used. In addition, copolymers, graft resins, and blend resins containing the above thermoplastic resin as a main component, such as ethylene-vinyl chloride copolymer, vinyl acetate-ethylene copolymer, vinyl acetate-vinyl chloride copolymer, urethane-vinyl chloride Copolymers, acrylonitrile-butadiene-styrene copolymers, acrylic acid-modified polypropylene, maleic acid-modified polyethylene, etc. can also be used. The above thermoplastic resin includes stabilizers, lubricants,
Additives such as processing aids, plasticizers, and colorants may also be included. Further, both thermoplastic resins obtained in powder form during polymerization and thermoplastic resins made into powder form by a pulverizer can be used. As for the particle size, it is preferable that the average particle size is less than 2 mm. When the average particle size exceeds 2 mm, it becomes difficult to uniformly impregnate the monofilaments of the reinforcing fiber bundle in the fluidized bed. The thermoplastic resin (A) and the thermoplastic resin (B) may be the same type or different types.

The ratio of the thermoplastic resin to the reinforcing fibers is appropriately determined depending on the required physical properties of the fiber-reinforced sheet, but it is preferable that the reinforcing fibers in the sheet account for 5 to 70% by weight. If the reinforcing fiber content is less than 5% by weight, the mechanical strength of the sheet will not be sufficient, and if it exceeds 70% by weight, it will be difficult to obtain a sheet uniformly impregnated with the thermoplastic resin.

The net-like reinforcing material may be any material as long as it is made of reinforcing fiber material and processed into a net-like face material by bonding, weaving, or the like.

[0014]

[Function] The fiber-reinforced sheet according to the present invention consists of a fiber-reinforced resin layer (A) in which continuous reinforcing fibers are arranged in one direction on a thermoplastic resin (A), and a thermoplastic resin (B).
) and a fiber-reinforced resin layer (i) in which reinforcing fibers with a length of 5 mm or more are arranged randomly in the longitudinal direction are integrated, so this fiber-reinforced sheet is
The presence of the fiber-reinforced resin layer (A) makes it suitable for molding molded parts that require mechanical strength in one direction, and the presence of the fiber-reinforced resin layer (B) improves the strength of the entire sheet.

Furthermore, since the net-like reinforcing material is interposed between the fiber-reinforced resin layer (A) and the fiber-reinforced resin layer (B),
During heating during press molding, the continuous reinforcing fibers arranged in one direction in the fiber-reinforced resin layer (A) do not flow unnecessarily.

[0016]

EXAMPLE The fiber-reinforced sheet of the present invention is manufactured by, for example, the apparatus shown in FIG. In the following description, the front refers to the right direction in FIG.

The fiber reinforced sheet manufacturing apparatus shown in FIG.
Three fluidized bed devices (1), upper, middle, and lower, and a rewind roll (1) arranged behind each fluidized bed device (1).
2), a pair of upper and lower scrapers (3) arranged in front of each fluidized bed device (1), and an upper scraper (
3) take-up drive rolls (4) disposed diagonally below and in front of the lower scraper (3);
a pinch roll (5) disposed above each take-up drive roll (4), and a rotary cutter (6) placed in front of and opposite each take-off drive roll (4); , upper and lower endless belts (7) (8) facing each other at a predetermined interval, and both endless belts (7)
) (8) Heating means (9) and cooling means (10) arranged sequentially from the rear side with respect to the opposing transfer parts (7a) (8a) (8a)
The rear part of the lower endless belt (8) is made to protrude rearward from the upper endless belt (7), and the transfer part (
The rear extension part of 8a) is positioned below the upper and middle rotary cutters (6) and serves as a feeding part (8b) into the gap between the endless belts (7) and (8). Note that instead of extending the transfer section (8a) to form the feeding section (8b), another endless belt may be arranged at the same location to provide the feeding section.

The bottom of the fluidized bed apparatus (1) is a perforated plate (11
), and gas (G) such as air or nitrogen sent from the gas supply path is ejected upward from below the perforated plate (11) through its many holes. As a result, the powdered thermoplastic resin filled in the tank of the fluidized bed device (1) becomes fluidized by the jetted gas (G), and the middle fluidized bed device (1) is filled with thermoplastic resin (A).
The fluidized bed (a) is the upper and lower fluidized bed apparatus (1)
A fluidized bed (b) of the thermoplastic resin (B) is formed in each of the parts. The reinforcing fiber bundle (F1) is attached to the middle unwinding roll (2), and the reinforcing fiber bundle (F1) is attached to the upper and lower unwinding rolls (2).
A reinforcing fiber bundle (f1) is wound around each of the reinforcing fiber bundles (f1). Although only one reinforcing fiber bundle (F1) (f1) is shown for convenience, in reality, a large number of reinforcing fiber bundles (F1) (f1) are used in parallel. Fiber bundles (
F1) Guide roll (12) for guiding (f1)
) is provided. The middle reinforcing fiber bundle (F1) is made to pass through the fluidized bed (a) to become a resin-attached fiber bundle (F2), which is continuously passed between the upper and lower endless belts (7) and (8). Guide role (1) to lead to
3) is provided in front of the scraper (3), and a guide roll (14) is provided above the feed section (8b). The upper and lower reinforcing fiber bundles (f1) are also passed through the fluidized bed (b) to become resin-attached fiber bundles (f2), and both resin-attached fiber bundles (f2) are cut using a rotary cutter (6). A guide roll (15) is provided in front of each scraper (3) to guide the scraper.

A continuous resin-adhered fiber bundle (F2) guided by the guide roll (14) is disposed diagonally above and behind the guide roll (14) located above the feed section (8b). A pair of long net-like reinforcements (N
) is provided with a rewind roll (20). guide·
The roll (14) is a continuous resin-attached fiber bundle (
F2) from above and below, and attach these to the upper and lower endless belts (7)
(8) It is located in such a position that it can be guided into the gap.

[0020] In this device, the reinforcing fiber bundle (F1) (f1
), a pair of upper and lower scrapers (3) are arranged so that the gap between them can be adjusted, but the reinforcing fiber bundle (F1) (
Vibration may be applied to f1) to remove excessively adhered powdery thermoplastic resin. In this case, the amount of adhered powdery thermoplastic resin can be adjusted by adjusting the strength of the vibration applied.

[0021] Both endless belts (7) and (8) are driven by a motor (
By driving one of the upper and lower pulleys (16, 17) using a device (not shown), the robot moves continuously in the same direction at approximately the same speed. Further, the rear portion of the transfer portion (7a) of the upper endless belt (7) is inclined rearward and upward, and the gap between the upper and lower transfer portions (7a) and (8a) widens toward the rear. Upper and lower endless belt (
7) (8) is made of high strength and heat resistant material such as steel, stainless steel, glass cloth reinforced Teflon, etc.

[0022] As the heating means (9), an electric heating type or a hot air circulation type heating furnace is used, and the upper and lower endless belts (7) and (8) may be passed through these. 7) A plurality of pairs of heating rolls may be used that press down and directly heat the transfer parts (7a) and (8a) of (8) from above and below. Inside the heating means (9) are a plurality of pairs of upper and lower guide rolls (18), as well as upper and lower cooling means (10).
) are provided with multiple pairs of upper and lower guide rolls (19).
are arranged respectively, and the upper and lower guide rolls (1
8) The gaps in (19) are adjustable. As the cooling means (10), an upper and lower endless belt (7)
A blower is used to blow air to cool the transfer parts (7a) and (8a) in (8). Note that the guide roll (19) itself may be cooled.

Next, a method for producing a fiber reinforced sheet according to the present invention using the above-mentioned apparatus will be explained.

[0024] A reinforcing fiber bundle (F1) (f1) consisting of a large number of continuous monofilaments is produced from each unwinding roll (2).
, the take-up drive roll (4) and the pinch roll (5)
) to prevent twisting.
Fluidized bed (a) (b) of powdered thermoplastic resin (A) (B)
pass through it. In the fluidized beds (a) and (b), the reinforcing fiber bundles (F1) (f1) are separated into monofilament units by gas jets, static electricity generated in the fluidized beds (a) and (b), and rubbing effects. , the fibers are opened, and the powdered thermoplastic resin enters between the monofilaments and adheres to the monofilaments.

[0025] The resin-adhered reinforcing fiber bundle (F2) (f2) is
It is passed between a pair of upper and lower scrapers (3), and excess powdered thermoplastic resin is removed by the scraper (3) to adjust the ratio of powdered thermoplastic resin and reinforcing fibers.

[0026] Then, a medium continuous resin-adhered fiber bundle (F2
) and the upper and lower net-like reinforcing materials (N) are continuously fed into the gap between the upper and lower endless belts (7) and (8), while the upper and lower resin-attached fiber bundles (f2) are cut using a rotary cutter (6). The upper cut resin-attached fibers (f3) are then dropped onto the upper net-like reinforcing material (N) that is sandwiching the middle-sized continuous resin-attached fiber bundle (F2). At the same time, lower cut resin-attached fibers (f3) are transferred to upper and lower endless belts (7) (8).
Drop and accumulate on the feeding part (8b) into the gap,
The upper and lower endless belts (7) (
8) Continuously feed into the gap. The upper and lower cut resin-attached fiber aggregates (f4) are sandwiched by both endless belts (7) and (8) moving through the intermediate continuous resin-attached fiber bundle (F2) and both net-like reinforcements (N). While checking, adjust the minimum gap between the endless belts (7) and (8) by adjusting the upper and lower guide rolls (18).
), pressurize the five parts in the thickness direction, and pass through a heating furnace (9) as a heating means in which hot air is circulated to integrate them. The temperature at this time is thermoplastic resin (A) (B
) is above the melting temperature of

[0027] Subsequently, the upper and lower endless belts (7) (8)
The minimum gap between them was adjusted by upper and lower guide rolls (19), and while this was pressurized, it was cooled by a cooling blower (10) as a cooling means to obtain a fiber-reinforced sheet (S).

The obtained fiber-reinforced sheet (S) has continuous reinforcing fibers (F3) arranged in one direction in the thermoplastic resin (A), as shown in FIG. On the upper and lower surfaces of the fiber-reinforced resin layer (A), a thermoplastic resin (B) with a length of 5 to 10 mm is attached via a net-like reinforcing material (N), respectively.
Two fiber-reinforced resin layers (i) in which reinforcing fibers (f5) of 0 mm are arranged randomly in the longitudinal direction are laminated and integrated in a sandwich shape.

Example 1 Polypropylene was used as the thermoplastic resins (A) and (B).

The reinforcing fiber bundle (F1) (f1) is a roving-like glass fiber bundle (monofilament diameter 14
μm, 1100 g/km) was used.

[0031] As the net-like reinforcing material, glass fiber is used.
Thickness 0.1mm, mesh 2x2cm, weight 29g/
m2 was used.

[0032] The upper and lower endless belts (7) and (8) have a width of 60 mm.
A glass fiber reinforced Teflon belt with a diameter of 0 mm and a thickness of 1 mm was used.

[0033] The medium reinforcing fiber bundle (F1) is passed continuously through the fluidized bed (a) of the powdered thermoplastic resin (A), and the powdered thermoplastic resin (A) is passed between the monofilaments. After impregnating the resin with the resin and adhering it to each monofilament, the excess amount was removed using a scraper (3), and the weight ratio of resin and reinforcing fiber was adjusted to 6:4. At this time, the reinforcing fiber bundle (F2
) was 1880 g/m2. This continuous resin-attached fiber bundle (F2) is guided by guide rolls (13) and (14), and the upper and lower net-like reinforcing materials (N) are guided by guide rolls (14) to form the upper and lower endless belts (7).
(8) Continuously feed into the gap.

[0034] The upper and lower reinforcing fiber bundles (f1) are passed continuously through the fluidized bed (b) of the powdered thermoplastic resin (B), and the powdered thermoplastic resin (B) is mixed with the monofilament. After impregnation and adhesion to each monofilament, the excess was removed using a scraper (3), and the weight ratio of resin and reinforcing fiber was adjusted to 8:2. Reinforced fiber bundle (f2) after adjusting resin adhesion amount
25m each by rotary cutter (6)
m, and the upper cut resin-attached fibers (f3) are dropped onto the upper part of the net-like reinforcing material (N) sandwiching the middle continuous resin-attached fiber bundle (F2) and accumulated. , the lower cut resin-attached fibers (f3) are dropped onto the feed portion (8b) into the gap between the upper and lower endless belts (7) and (8) and are accumulated. Medium continuous resin-attached fiber bundle (F2),
The width of the net-like reinforcement material (N) and the feeding part (8b) is 6
00 mm, and the upper and lower cut resin-attached fibers (f3) were dropped and accumulated over the entire width thereof to a weight of 1480 g/m2, respectively. The apparent thickness of both cut resin-adhered fiber aggregates (f4) at this time is approximately 25 mm.
Met.

The laminate (f4) of both is continuously fed into the gap between the upper and lower endless belts (7) and (8) along with the movement of the medium continuous resin-adhered fiber bundle (F2) and the net-like reinforcing material (N), Both endless belts (7) (8) move the upper and lower cut resin-adhered fiber aggregates (f4) through the middle continuous resin-adhered fiber bundle (F2) and the net-like reinforcement (N) at 580 mm/min. ) while passing through a hot air heating furnace (9) with a length of 1500 mm in which hot air at about 200° C. was circulated. At this time, the guide roll (18) adjusts the gap between the upper and lower endless belts (7) and (8) to 3.7 mm and pressurizes them, and then the guide roll (19) moves the upper and lower endless belts (7) and 8) Adjust the gap to 3.6 mm and cool with a cooling blower (10) while applying pressure.

In this way, as shown in FIG. 2, the continuous reinforcing fibers (F3) are arranged in a net-like manner on both sides of the 1 mm thick fiber-reinforced resin layer (A), which is arranged in one direction. Each 1 piece in which reinforcing fibers (f5) with a length of 25 mm are arranged in a random direction through a reinforcing material (N)
．． 2mm thick fiber reinforced resin layer (i) is laminated, width 60mm
A fiber reinforced sheet (S) having a thickness of 0 mm and a thickness of 3.6 mm was obtained.

Example 2 A fiber-reinforced sheet having the same structure as Example 1 was obtained in the same manner as in Example 1 except for the following.

As the thermoplastic resins (A) and (B), vinyl chloride resin with a degree of polymerization of 800 (average particle size 150 μm) 10
0 parts by weight, 3 parts by weight of butyltin maleate and 5 parts by weight of glycidyl methacrylate copolymer were used.

As the reinforcing fiber (f1), the same one as in Example 1 was used, and the thermoplastic resin (A) and the reinforcing fiber bundle (F1) were used.
), the reinforcing fiber bundle (f1) was a roving-like glass fiber bundle (monofilament diameter 23 μm, 4400 g/km) cut into 25 mm pieces, and reinforced with thermoplastic resin (B). The weight ratio of the fiber bundle (F1) was set to 3:1.

As the net-like reinforcing material (N), glass fiber having a thickness of 0.13 mm, a mesh size of 3×3/cm, and a weight of 40 g/m 2 was used.

[0041] The thickness of the fiber-reinforced sheet was 3.7 mm.

Example 3 A fiber-reinforced sheet having the same structure as Example 1 was obtained in the same manner as in Example 1 except for the following.

Nylon 12 was used as the thermoplastic resins (A) and (B).

[0044] The reinforcing fiber bundle (F1) has a diameter of 7 μm.
Using a roving-like polyacrylonitrile carbon fiber bundle made up of 6,000 monofilaments, the weight ratio of the thermoplastic resin (A) and reinforcing fiber bundle (F1) was 1:1.
1, and the same reinforcing fiber bundle (f1) as in Example 1 was used by cutting it into 50 mm pieces, and the weight ratio of the thermoplastic resin (B) and the reinforcing fiber bundle (f1) was 3:1.

As the net-like reinforcing material (N), glass fiber having a thickness of 0.26 mm and a weight of 85 g/m2 was used.

[0046] The thickness of both fiber-reinforced resin layers (a) is 2.3
mm, and the thickness of the fiber reinforced sheet was 6.1 mm.

Example 4 A fiber-reinforced sheet having the same structure as Example 1 was obtained in the same manner as in Example 1 except for the following.

Polybutylene terephthalate was used as the thermoplastic resins (A) and (B). Reinforced fiber bundle (F1)
A roving-like polyacrylonitrile carbon fiber bundle made up of 6,000 monofilaments with a diameter of 7 μm was used, and a thermoplastic resin (A) and a reinforcing fiber bundle (F) were used.
The weight ratio of 1) is 6:4, a roving glass fiber bundle (monofilament diameter 33 μm, 4400 g/km) is used as the reinforcing fiber bundle (f1), and the thermoplastic resin (B) and the reinforcing fiber bundle (f1) are used. ) was set at a weight ratio of 7:3.

The net-like reinforcing material (N) used was glass fiber having a thickness of 0.17 mm, a mesh size of 4×4/cm, and a weight of 55 g/m 2 .

[0050] The thickness of both fiber-reinforced resin layers (a) is 2 mm each.
The thickness of the fiber-reinforced sheet was 5.4 mm.

Example 5 A fiber-reinforced sheet having the same structure as Example 1 was obtained in the same manner as in Example 1 except for the following.

The thermoplastic resins (A) and (B) were prepared by blending 100 parts by weight of a vinyl chloride resin with a degree of polymerization of 600 with 3 parts by weight of butyltin maleate and 5 parts by weight of a glycidyl methacrylate copolymer.

Thermoplastic resin (A) and reinforcing fiber bundle (F1)
The weight ratio was 1:1, and the same reinforcing fiber bundle (f1) as in Example 1 was used, cut into 12.5 m pieces.
The weight ratio of the thermoplastic resin (B) and the reinforcing fiber bundle (f1) was set to 7:3.

[0054] The thickness of both fiber-reinforced resin layers (a) is 2 mm each.
The thickness of the fiber-reinforced sheet was 5.4 mm.

Comparative Examples 1 to 5 Comparative Examples 1 to 5 are the net-like reinforcing materials (N) of Examples 1 to 5.
It is equivalent to excluding each.

The sheets of Examples 1 to 5 and Comparative Examples 1 to 5 were cut into squares of 425 x 425 mm with sides parallel to the direction of the reinforcing fibers aligned in one direction, and heated in a far-infrared heating furnace. Press molding was performed by placing it in the center of a 600 x 600 mm square plate mold. Width 20mm x from positions (I) to (V) shown in Figure 3 of the formed flat plate
Five test pieces with a length of 150 mm were cut out with the length direction parallel to the direction of the reinforcing fibers aligned in the direction shown by the arrow (y), and the distance between the fulcrums was 12 in accordance with JIS K7203.
A three-point bending test was performed at 0 mm to determine the bending elastic modulus (kg/m
m2) and the thickness of the flat plate after molding are shown in Table 1.
Shown below.

[0057]

[Table 1]

Example 6 and Comparative Example 6 The sheets of Example 1 and Comparative Example 1 were formed into an inverted U-shaped member (M) as shown in FIG.

When the sheet was placed in the mold, the fibers aligned in one direction were made parallel to the longitudinal direction of the inverted U-shaped member. Five test pieces with a width of 20 mm and a length of 150 mm were cut out from random positions on the top wall of the formed inverted U-shaped member in parallel to the longitudinal direction of the inverted U-shaped member.
Table 2 shows the results of measuring the bending elastic modulus (kg/mm2) by performing a three-point bending test with a distance between fulcrums of 120 mm in accordance with 7203.

[0060]

[Table 2]

[0061]

[Effects of the Invention] The fiber-reinforced sheet of the present invention is suitable for molding molded parts that require mechanical strength in one direction due to the presence of the fiber-reinforced resin layer (A) serving as a core layer. The presence of the fiber-reinforced resin layer improves the strength of the entire sheet, making it an excellent sheet for press molding.

[0062] Furthermore, since the continuous reinforcing fibers arranged in one direction in the fiber-reinforced resin layer (A) do not flow unnecessarily during heating during press molding, it is possible to use the sheet according to the present invention. By molding the material, it is possible to obtain a molded product that is sufficiently and uniformly reinforced in the desired direction.

[Brief explanation of drawings]

FIG. 1 is a side view showing a state in which a sheet according to the present invention is manufactured by a fiber-reinforced sheet manufacturing apparatus.

[Figure 2] Upper fiber-reinforced resin layer (I), upper net-like reinforcement material (N), middle fiber-reinforced resin layer (A), lower net-like reinforcement material (N), and lower fiber-reinforced resin layer (I) in order. FIG. 3 is a partially cutaway plan view of the sheet.

FIG. 3 is an explanatory diagram of cutting out a test piece from a fiber-reinforced sheet.

FIG. 4 is a perspective view of an inverted U-shaped member formed using a fiber-reinforced sheet obtained according to the present invention.

[Explanation of symbols]

(A) (B) Thermoplastic resin (A) (I) Fiber reinforced resin layer

Claims (1)

[Claims] Claim 1: A fiber-reinforced resin layer (A) in which continuous reinforcing fibers are arranged in one direction in a thermoplastic resin (A), and a reinforced thermoplastic resin (B) with a length of 5 mm or more. A fiber-reinforced sheet made by laminating and integrating a fiber-reinforced resin layer (i) in which fibers are arranged randomly in the longitudinal direction via a net-like reinforcing material.