JPH09277420A - Fiber reinforced plastic structure and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem such as the burr or peeling of side end surfaces, the falling-off or scattering of fibers or the like and the appearance inferiority caused by the protrusion of an adhesive by covering the side end surfaces of a first member with a second member in laminar constitution consisting of the first member composed of a resin containing continuous fibers and the second member composed of a resin. SOLUTION: In laminar constitution consisting of a first member 1 composed of a resin containing continuous fibers and a second member 2 composed of a resin, the side end surfaces 11, 11 of the first member are covered with the second member to constitute a fiber reinforced plastic structure. As the resin in the second member, a resin good in flowability is used in order to sufficiently cover the side end surfaces of the first member 1. By this constitution, since burr or peeling becomes hard to generate during production or use, the hand is not damaged by the end parts of the fiber reinforced plastic structure and the circuit of a peripheral electric/electronic part is not short-circuited by fallen- off carbon fibers and, when two members are bonded by an adhesive, it is prevented that the adhesive protrudes to damage the appearance of a product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is required to have a complicated shape such as a casing of an electric / electronic device such as a personal computer and an internal support, and to be lightweight, high strength and high rigidity. The present invention relates to a fiber-reinforced plastic structure suitable for use and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, for example, as a keyboard support for electric and electronic devices, a thin, lightweight, high-strength and high-rigidity first member made of fiber reinforced plastic (CFRP) having continuous carbon fibers as a reinforcing material, and a flowable member. A layered structure with a second member having a complicated shape made of a resin having good properties has been developed.

However, in this case, since the carbon fibers are exposed on the side end surface of the first member, wrinkles and peeling easily occur during manufacture or use. Therefore, there is a possibility that the hand may be injured at the end, or the dropped carbon fiber may short-circuit the circuits of the surrounding electric and electronic parts. Further, when the two members are bonded together with an adhesive, there are problems such as the adhesive protruding to impair the external appearance of the product, and extra cost for removing the protruding adhesive.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art. It is thin, lightweight, has high strength and high rigidity, and has the problems of flaking and peeling of side end faces, dropping and scattering of fibers. It is also an object of the present invention to provide a fiber-reinforced plastic structure and a method for manufacturing the same, which can eliminate the appearance defect due to the protrusion of the adhesive and the unnecessary cost for removing the protruding adhesive. .

[0005]

The present invention for achieving the above object has the following constitution.

(1) It has a layered structure of a first member made of resin containing continuous fibers and a second member made of resin, and the side end surface of the first member is covered with the second member. Characteristic fiber reinforced plastic structure. The resin in the second member is preferably a resin having good fluidity so as to sufficiently cover the side end surface of the first member.

(2) It has a layered structure of a first member made of a resin containing continuous fibers and a second member made of a resin containing short fibers, and the side end surface of the first member is covered with the second member. A fiber-reinforced plastic structure characterized in that

(3) A carbon fiber or a glass fiber is contained as the continuous fiber, wherein the continuous fiber is included.
The fiber-reinforced plastic structure described. PAN is carbon fiber
Strand strength is 3 ×
It is preferable that the elastic modulus is 10 ⁹ Pa or more and the tensile elastic modulus is 2 × 10 ¹¹ Pa or more because the thickness can be reduced.

(4) The fiber-reinforced plastic structure according to any one of claims 1 to 3, wherein the continuous fibers are in the form of a woven fabric or a unidirectionally oriented sheet. When the continuous fiber is a woven fabric, a plain woven fabric having less openings is preferable in terms of improving surface smoothness and preventing warpage. Further, when using satin fabric, it is preferable that the woven fabric be symmetrical in order to suppress warpage.

(5) The resin forming the first member is a thermosetting resin, and the resin forming the second member is a thermoplastic resin. The fiber-reinforced plastic structure according to any one of claims. As the thermosetting resin, any of phenol resin, epoxy resin, unsaturated polyester resin, vinyl ester resin and the like may be used. As the thermoplastic resin, any of polyamide resin, polycarbonate resin, PBT resin, polyacetal resin, polyphenylene sulfide resin, etc. may be used. In addition, if necessary, inorganic particles, flame retardant, colorant, reinforcing material, etc. can be added to improve fire resistance, flame retardancy,
It is preferable because the appearance, strength and the like are improved. The reinforcing material may be an inorganic filler, whiskers, fibers or the like.

(6) The fiber-reinforced plastic structure according to any one of claims 1 to 5, wherein the first member and the second member are joined together. The joining may be performed by using an adhesive or an adhesive tape, and may be performed by integrally molding the first member and the second member directly bonded to each other. From the viewpoint of adhesive strength and simplification of manufacturing process, it is preferable to use integral molding. Further, when an adhesive is used, it is preferable to add a pigment or a dye because the joint can be made inconspicuous.

(7) The fiber reinforced plastic structure according to any one of claims 1 to 6, wherein the side end surface of the first member is provided with a taper. The taper angle is preferably in the range of 20 to 85 degrees, but is more preferably in the range of 30 to 60 degrees because the strength of the end portion and the effect due to the taper described later are easily compatible with each other. Note that the taper does not necessarily have to be provided on the entire side end surface, and may be chamfered.
Alternatively, the corners may be rounded.

(8) In manufacturing the fiber-reinforced plastic structure according to any one of claims 1 to 7,
A method for producing a fiber-reinforced plastic structure, characterized in that the member and the second member are separately molded, and then both members are superposed and joined. As a joining method, fitting, screwing or the like can be considered, but usually an adhesive is used.

(9) In manufacturing the fiber-reinforced plastic structure according to any one of claims 1 to 7,
A method for manufacturing a fiber-reinforced plastic structure, comprising forming a member in advance and integrally forming a second member on the first member. The integral molding method may be any of transfer molding, press molding, injection molding and the like, but it is preferable to use injection molding since it is easy to form a thin and complicated shape.

(10) An internal support for electric / electronic equipment comprising the fiber-reinforced plastic structure according to any one of claims 1 to 7. The internal supports are various supports provided inside the device to support components and the like.

(11) A keyboard support for electric / electronic equipment, which comprises the fiber-reinforced plastic structure according to any one of claims 1 to 7.

(12) A casing for electric / electronic equipment comprising the fiber reinforced plastic structure according to any one of claims 1 to 7.

(13) The internal support according to claim 10,
The keyboard support according to claim 11 and claim 12.
A keyboard comprising at least one of the housings described in 1. The keyboard is, for example, a key input device of a personal computer.

(14) The internal support according to claim 10,
The keyboard support according to claim 11 and claim 12.
A display device comprising at least one of the housings described in 1. A display device is C
It is a device such as an RT, a liquid crystal display, an EL display, or a plasma display that displays electric signals as characters or images.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. Note that, here, for simplicity, a case where the fiber-reinforced plastic structure is composed of two members will be described, but it may be composed of three or more members.

FIG. 1 shows a first resin made of a continuous fiber.
A fiber-reinforced plastic structure having a layered structure of a member 1 and a second member 2 made of a resin or a resin containing short fibers, and a side end surface 11 of the first member 1 is covered with the second member 2. The cross section of is shown. The side surface 11 of the first member 1 is entirely covered with the second member 2. The side end surface 11 of the first member 1 may be wrapped with the second member 2.

FIG. 2 shows a cross section of the side end surface 11 of the first member 1 which is tapered. In this way, the second member 2
When the taper that narrows the side is given, the fitting work becomes easy when the first member 1 and the second member 2 which are separately molded are joined. In addition, when the second member 2 is integrally molded with the first member 1, the second member 2 easily goes around the side end surface 11. In addition, if the taper is widened on the side of the second member 2, it is possible to relatively easily achieve the effect that the joining of the first member 1 and the second member 2 becomes more reliable.

[0023]

【Example】

Example 1 First, a carbon fiber plain woven fabric (weight per unit area: 200 g / m ² ) was impregnated with a phenol resin and then dried to obtain a prepreg.
This prepreg was cut into a predetermined shape, and a flat plate was molded with 1 ply to obtain a notebook computer keyboard support first member 3 having a thickness of about 0.2 mm as shown in FIG.

Next, using PPS resin (containing 20 wt% of glass fiber), the cylinder temperature was 320 ° C. and the mold temperature was 12.
At 5 ° C., a second keyboard support member 4 for a notebook computer having a shape covering the side end surface of the first keyboard support member 3 as shown in FIG. 4 was formed. In addition, in FIG.
Reference numeral 1 is a rib portion, 42 is a boss portion, and 43 is a hinge portion. Then, after cleaning the adhesive surfaces of both members, the black dye is added to 0.6.
Apply urethane adhesive containing wt%, and apply at room temperature for 20
I left it for about a minute. Then, the two members were bonded by heating and pressurizing at a pressure of 49 Pa for 1 minute with a hot press heated to 40 ° C. Thus, the rib portion 4 as shown in FIG.
1, 0.8 mm in thickness excluding the boss portion 42 and the hinge portion 43 (FIG. 4), light weight, high strength and high rigidity, excellent in electromagnetic wave shielding characteristics, and the side end surface of the keyboard supporting member first member 3 is flared or peeled off. There is no sticking out of the adhesive,
A keyboard support for a notebook computer, in which the adhesive layer is inconspicuous, was obtained.

Example 2 Instead of the PPS resin, a liquid crystal polymer (glass short fiber 35 wt.
A keyboard support for a notebook personal computer was obtained in the same manner as in Example 1 except that (%) was used. Similar to the support obtained in Example 1, this support also has a thickness of 0.8 excluding the rib portion 41, the boss portion 42, and the hinge portion 43 (FIG. 4).
mm, light weight, high strength and high rigidity, excellent electromagnetic wave shielding properties, no fraying or peeling of the side end surface of the keyboard support first member 3, and no adhesive sticking out, making the adhesive layer inconspicuous. It was

[0026]

The fiber-reinforced plastic structure of the present invention comprises a first member made of a resin containing continuous fibers, and a resin.
Alternatively, since it has a layered structure with a second member made of a resin containing short fibers, and the side end surface of the first member is covered with the second member, the end surface of the first member on the side surface is flared or peeled off, and the fibers fall off. And can prevent scattering. In addition, it is possible to reduce the appearance defect due to the protrusion of the adhesive and the extra cost required for removing the adhesive that has protruded. Moreover, it can be made thin, lightweight, and has high strength and high rigidity, and if carbon fibers are used as continuous fibers, excellent electromagnetic wave shielding properties can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fiber reinforced plastic structure according to an example of the present invention.

FIG. 2 is a cross-sectional view of a fiber reinforced plastic structure according to another example of the present invention.

FIG. 3 is a perspective view of a keyboard support first member of the embodiment.

FIG. 4 is a perspective view of a keyboard support second member of the embodiment.

FIG. 5 is a partial cross-sectional perspective view of the keyboard support of the embodiment.

[Explanation of symbols]

 1: 1st member 11: Side end surface 2: 2nd member 3: Keyboard support 1st member 4: Keyboard support 2nd member 41: Rib part 42: Boss part 43: Hinge part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B32B 17/04 B32B 27/08 27/08 7301-4E H05K 5/02 J H05K 5/02 B29C 67 / 14 P

Claims (14)

[Claims] 1. A first member made of a resin containing continuous fibers,
A fiber-reinforced plastic structure having a layered structure with a second member made of resin, wherein a side end surface of the first member is covered with the second member. 2. A first member made of a resin containing continuous fibers,
A fiber-reinforced plastic structure having a layered structure with a second member made of a resin containing short fibers, wherein a side end surface of the first member is covered with the second member. 3. The fiber-reinforced plastic structure according to claim 1, which contains carbon fibers or glass fibers as continuous fibers. 4. The continuous fiber is in the form of a woven fabric or a unidirectionally aligned sheet.
The fiber-reinforced plastic structure according to any one of 1. 5. The resin according to claim 1, wherein the resin forming the first member is a thermosetting resin, and the resin forming the second member is a thermoplastic resin. A fiber-reinforced plastic structure as described in 1. 6. The fiber-reinforced plastic structure according to claim 1, wherein the first member and the second member are joined to each other. 7. The fiber-reinforced plastic structure according to claim 1, wherein the side end surface of the first member is provided with a taper. 8. When manufacturing the fiber-reinforced plastic structure according to claim 1, the first member and the second member are separately molded, and then both members are superposed and joined. A method for producing a fiber-reinforced plastic structure, comprising: 9. When manufacturing the fiber-reinforced plastic structure according to any one of claims 1 to 7, the first member is preformed, and the second member is integrally molded with the first member. A method for producing a fiber-reinforced plastic structure, which is characterized. 10. An internal support for electric / electronic equipment, characterized by using the fiber-reinforced plastic structure according to any one of claims 1 to 7. 11. A keyboard support for electric / electronic equipment, characterized by using the fiber-reinforced plastic structure according to claim 1. 12. A casing for electric / electronic equipment, which uses the fiber-reinforced plastic structure according to any one of claims 1 to 7. 13. A keyboard comprising at least one of the internal support according to claim 10, the keyboard support according to claim 11 and the housing according to claim 12. 14. A display device using at least one of the internal support according to claim 10, the keyboard support according to claim 11, and the housing according to claim 12.