JP2012035534A - Fiber-reinforced thermoplastic resin molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced thermoplastic resin molded body with a rib having uniform physical properties, which can be molded efficiently in a short time with excellent mass productivity.SOLUTION: The fiber-reinforced thermoplastic resin molded body includes 15-80 wt.% of reinforced fiber and 20-85 wt.% of thermoplastic resin. The reinforced fiber is dispersed in a monofilament state, and moreover, a weight average fiber length (Lw) of the reinforced fiber falls within a range of 0.5-10 mm, and an orientation parameter (fp) of the reinforced fiber falls within a range from -0.25 to 0.25. The fiber-reinforced thermoplastic resin molded body includes the rib at least on one surface of the molded body, which extends in a direction along the surface, and a height h of the rib falls within a range of 0.5-120 mm.

Description

  The present invention relates to a fiber-reinforced thermoplastic resin molded body composed of reinforcing fibers and a thermoplastic resin, and more particularly to a fiber-reinforced thermoplastic resin molded body that is efficiently molded into a desired shape by press molding using a mold.

  For molding a fiber reinforced thermoplastic resin molded article having mechanical properties (for example, rigidity) with excellent isotropic properties, particularly for molding a fiber reinforced thermoplastic resin molded article having a portion with a changed thickness such as a rib part, It is known that the use of a thermoplastic resin in which reinforcing fibers having a relatively short fiber length are randomly dispersed is effective (for example, Patent Documents 1 and 2). However, in the molding techniques disclosed in these Patent Documents 1 and 2, for example, resin pellets containing short fiber reinforcing fibers are melted and kneaded, and the reinforcing fibers are dispersed in the molten resin or injected into a mold. The extrusion method is premised on a molding method having a relatively long molding cycle, that is, difficult to mold in a short time. Therefore, this molding technique is not suitable for manufacturing a molded product requiring mass production from the viewpoint of the molding cycle.

  On the other hand, as a method that enables efficient molding in a short time, a molding technique by press molding of a molding substrate in a mold such as stamping molding is known. In this technique, a heated base material is press-molded into a predetermined shape in a mold. When high isotropy is required for a molded product, a short fiber reinforced fiber is usually matted. A stamping mat base material arranged in a shape is used. However, since this mat base material is usually a sheet-like base material, it is difficult to apply as it is to the molding of a molded article having ribs, which is a subject of the present invention.

  In order to achieve high isotropy, a fiber reinforced thermoplastic resin molded article having excellent dispersibility of short fiber reinforced fibers in a resin has recently been developed (Patent Documents 3 and 4). Although these Patent Documents 3 and 4 describe various uses and the like, more specifically, what shape is suitable for a product having a shape excellent in dispersibility of the reinforcing fiber, Furthermore, it has an application limit, especially ribs, to what shape a molding technique capable of a molding cycle in a short time such as the above-mentioned stamping molding on the premise of press molding with a mold. The application limit to the molded body is not necessarily specified.

Japanese Patent No. 3993292 Japanese Patent No. 4439361 WO 2007/097436 WO 2010/013645

  Therefore, in view of the above situation, the object of the present invention is to provide a fiber-reinforced thermoplastic resin molded article that can exhibit basically excellent lightness and high rigidity, in particular, uniform physical properties, especially high isotropy. In addition to providing a technology that can be made into a molded product having excellent properties and capable of forming a molded product with excellent mass productivity that can be molded efficiently in a short time, and what kind of molded product shape the technology can be applied to The purpose is to clarify and enable deployment to more specific applications.

  In order to solve the above problems, a fiber-reinforced thermoplastic resin molded body according to the present invention is a molded body composed of 15 to 80% by weight of reinforcing fiber and 20 to 85% by weight of thermoplastic resin, and the reinforcing fiber is a single body. The fiber is dispersed and the weight average fiber length (Lw) of the reinforcing fiber is in the range of 0.5 to 10 mm, and the orientation parameter (fp) of the reinforcing fiber defined in this specification is − It consists of a fiber reinforced thermoplastic resin molded product in the range of 0.25 to 0.25, and has a rib extending in a direction along the surface on at least one surface of the molded product, and the height h of the rib is 0.5. It consists of what is characterized by existing in the range of -120 mm. A more preferable range of the orientation parameter (fp) of the reinforcing fiber is −0.15 ≦ fp ≦ 0.15. In the present invention, the number of ribs is not particularly limited, and may be any number of two or more as well as a single number.

  In such a fiber reinforced thermoplastic resin molded body according to the present invention, the reinforcing fiber having a weight average fiber length (Lw) in the range of 0.5 to 10 mm in the fiber reinforced thermoplastic resin of the molded body is a single fiber. Since the orientation parameter (fp) of the reinforcing fiber defined as described later is in the range of -0.25 to 0.25, it is very well dispersed in the form of a single fiber. In particular, it has uniform physical properties and high isotropic mechanical properties (particularly rigidity). And since the reinforcing fibers are very well dispersed in the form of single fibers, even if the shape of the molded product to be molded has some irregularities, the accuracy of the shape and uniform mechanical properties are substantially impaired. Therefore, it is possible to perform one-shot molding by pressing using a mold. In particular, when the molded body has ribs, by restricting the height h of the ribs within a range of 0.5 to 120 mm, by a press using a mold, particularly by various press molding methods as described later, A desired molded body can be efficiently molded in a short time, and a manufacturing technique excellent in mass productivity can be provided. A more preferable range of the rib height h for obtaining a molded body having a predetermined shape more reliably by press molding is a range of 10 to 60 mm.

  In the fiber-reinforced thermoplastic resin molded article according to the present invention, it is particularly important to uniformly disperse reinforcing fibers into single fibers. In order to achieve this uniform dispersion more reliably, the reinforcing fibers Is preferably dispersed using a papermaking process. For example, instead of spreading the fibers at the end as in the case of normal nonwoven fabric production, the reinforcing fibers are uniformly dispersed in the liquid (for example, in water) by stirring, etc., and the liquid is drained to leave the uniform dispersion state as it is. It is preferable to adopt a technique such as hardening in a resin. By dispersing the reinforcing fibers into a single fiber using such a papermaking process, the orientation parameter (fp) can be more reliably kept within the range of −0.25 to 0.25, and uniform. A fiber-reinforced thermoplastic resin molded article having mechanical properties and having a rib having a predetermined shape can be manufactured with excellent mass productivity by press molding.

  Moreover, in this invention, even when it has a rib of the following shapes, it can shape | mold without a problem. For example, in the case where the rib has a rib in which the angle θ of the rib rising surface from the one surface is in the range of 20 to 90 ° with respect to the one surface in the cross section in the direction perpendicular to the rib extending direction of the rib. It is possible to form a molded body having a target shape. Molding of a molded body having such ribs having the angle θ cannot be molded by a press using a conventional ordinary stamping mat base material. A more preferable range of the angle θ of the rib rising surface is 30 to 90 °.

  The rib width d at the top of the rib is preferably in the range of 0.5 to 200 mm. More preferably, it is the range of 0.5-100 mm, More preferably, it is the range of 1-10 mm. If it is in the range of 0.5 to 200 mm, press molding is possible without problems.

  Moreover, as thickness t of parts other than the said rib of the said molded object, if it exists in the range of 0.8-10 mm, for example, the fiber reinforced thermoplastic resin molded object of a desired shape can be press-molded without a problem. Preferably, the thickness t is in the range of 1-5 mm, more preferably in the range of 2-3.5 mm, for example.

  In the fiber reinforced thermoplastic resin molded body according to the present invention, the type of the reinforcing fiber is not particularly limited, and a hybrid configuration in which various reinforcing fibers such as carbon fiber, glass fiber, and aramid fiber, and further different types of reinforcing fibers are combined. Can be used. For example, when carbon fiber is included as the reinforcing fiber, high rigidity and strength can be expected. When glass fiber is included as the reinforcing fiber, high lightness can be expected.

  Further, the thermoplastic resin as the matrix resin of the fiber-reinforced thermoplastic resin molded article according to the present invention is not particularly limited, and examples of usable resins include polyamide (nylon 6, nylon 66, etc.), polyolefin (polyethylene, polypropylene). Etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate, polyamideimide, polyphenylene sulfide, polyphenylene oxide, polysulfone, polyethersulfone, polyetheretherketone, polyetherimide, polystyrene, ABS, liquid crystal polyester, and acrylonitrile Examples include styrene copolymers. A mixture of these may also be used. Moreover, what was copolymerized like the copolymer nylon of nylon 6 and nylon 66 may be used. Furthermore, depending on the required properties of the molded product to be obtained, flame retardants, weather resistance improvers, other antioxidants, heat stabilizers, UV absorbers, plasticizers, lubricants, colorants, compatibilizers, conductive fillers, etc. It can be added.

  The fiber reinforced thermoplastic resin molding according to the present invention can be molded by various press molding methods. Specifically, as will be described in detail in the following embodiments, for example, an intermediate base material for molding formed of reinforcing fibers and a thermoplastic resin is heated in a preheating device, and the heated base material is placed in a mold. Then, after forming the substrate by pressing in a mold, it can be formed using a first forming process in which it is cooled and solidified.

  Alternatively, an intermediate substrate for molding a molded body composed of reinforcing fibers and a thermoplastic resin is placed in the mold, the mold is heated to a temperature higher than the melting point of the thermoplastic resin, and the substrate is pressed in the mold. Molding can be performed using a second molding process in which the mold is cooled while maintaining the press pressure. This second molding process is a preferable molding process in the present invention because it can be rapidly heated and cooled, and can be molded in a short time.

  Alternatively, an intermediate substrate for molding a molded body composed of reinforcing fibers and a thermoplastic resin is heated in a preheating device, the mold is heated to a temperature equal to or higher than the melting point of the thermoplastic resin, and the heated substrate is placed in the mold. Then, the substrate can be molded by pressing in the mold, and at the same time, the mold can be cooled and molded using a third molding process in which the substrate is cooled and solidified.

  The fiber-reinforced thermoplastic resin molded body of the present invention is not limited to the above three molding processes, and each process such as heating and cooling of a mold can be appropriately selected.

  The use of the fiber-reinforced thermoplastic resin molded article according to the present invention is not particularly limited, and various applications that can be developed will be described later, but the present invention is particularly a roof part that requires excellent mass productivity. It is suitable for application to.

  As described above, according to the fiber-reinforced thermoplastic resin molded article according to the present invention, the excellent lightness and high mechanical properties (particularly, high rigidity) inherently possessed by the fiber-reinforced thermoplastic resin are favorably expressed. In addition, a molded article having uniform physical properties, particularly high isotropy, can be realized, and the molded article can be molded efficiently and with excellent mass productivity in a short time. Furthermore, it is possible to clearly present the range of the shape of the molded body with ribs that can be manufactured by substantially one-shot molding by press molding, making it possible to reliably provide the present invention for the production of molded products in more specific applications. Become.

It is sectional drawing of the fiber reinforced thermoplastic resin molding which concerns on one embodiment of this invention. It is a schematic block diagram which shows the 1st shaping | molding process for shape | molding the fiber reinforced thermoplastic resin molding which concerns on this invention. It is a schematic block diagram which shows the 2nd shaping | molding process for shape | molding the fiber reinforced thermoplastic resin molding which concerns on this invention. It is a schematic block diagram which shows the 3rd shaping | molding process for shape | molding the fiber reinforced thermoplastic resin molding which concerns on this invention.

less than. The present invention will be described in detail along with preferred embodiments.
The fiber-reinforced thermoplastic resin molded body according to the present invention is a molded body composed of 15 to 80% by weight of reinforcing fibers and 20 to 85% by weight of thermoplastic resin, and the reinforcing fibers are dispersed in a single fiber shape. And the weight average fiber length (Lw) of the reinforcing fiber is in the range of 0.5 to 10 mm, and the orientation parameter (fp) of the reinforcing fiber as defined herein is -0.25 to 0.25. A rib-reinforced thermoplastic resin molded body in the range (preferably in the range of -0.15 to 0.15), and having a rib extending in a direction along the surface on at least one surface of the molded body. The height h is in the range of 0.5 to 120 mm.

  Here, the weight average fiber length (Lw), the orientation parameter (fp), and the evaluation method thereof will be described.

(1) Measuring method of weight average fiber length (Lw) After cutting out a part of a molding material or a fiber reinforced thermoplastic resin molding and sufficiently dissolving the matrix resin with a solvent for dissolving the matrix resin (thermoplastic resin), It isolate | separates from a reinforced fiber by well-known operation, such as filtration. When there is no solvent for dissolving the matrix resin, a part of the molding material or the fiber-reinforced thermoplastic resin molded body is cut out and heated at a temperature of 500 ° C. for 2 hours to burn off the thermoplastic resin fibers and separate the reinforcing fibers. . 400 separated reinforcing fibers are randomly extracted, and the length is measured to the unit of 1 μm with an optical microscope or a scanning electron microscope to obtain the fiber length, and the weight average fiber length (Lw) is obtained by the following formula.
Weight average fiber length (Lw) = Σ (Li × Wi / 100)
Li: measured fiber length (i = 1, 2, 3,..., 400)
Wi: Weight fraction of fiber with fiber length Li (i = 1, 2, 3,..., 400)
If the number of measured reinforcing fibers randomly extracted is 400 or more, the calculated value of the weight average fiber length (Lw) of the reinforcing fibers hardly changes.

(2) Orientation parameter (fp) and its evaluation method A part of the fiber reinforced thermoplastic resin molded body is cut out, the cut specimen is embedded in an epoxy resin, and the surface of the fiber reinforced thermoplastic resin molded body is fiber reinforced. An observation test piece is prepared by polishing from the surface of the thermoplastic resin molded body to a depth of 100 μm.
Further, a part of the molding material is cut out, the cut out test piece is embedded in an epoxy resin, and the surface of the molding material is polished to a depth of 100 μm from the surface of the molding material to prepare an observation test piece.
A fiber reinforced thermoplastic resin molded article or a test piece for observing a molding material is observed with an optical microscope, and 400 reinforcing fibers are selected at random. The polished surface of the reinforcing fiber is generally elliptical, and the major axis direction of this ellipse is taken as the fiber orientation direction. Next, one reference straight line as an angle reference is arbitrarily set, and all the angles formed by the orientation directions of the selected reinforcing fibers with respect to the reference straight line (hereinafter, abbreviated as the orientation angle αi) are measured. The orientation angle αi is an angle of 0 ° or more and less than 180 °, which is obtained by measuring an angle in a counterclockwise direction with respect to the reference straight line. Using this orientation angle αi, the orientation parameter (fp) of the fiber-reinforced thermoplastic resin molding or molding material is obtained by the following equation.
fp = 2 × Σ (cos2αi / 400) −1
Αi: measured orientation angle (i = 1, 2, 3,..., 400)
In addition, as a test piece for measuring the “orientation parameter” of a fiber reinforced thermoplastic resin molded article or molding material, avoid the end of the fiber reinforced thermoplastic resin molded article or molding material, and try to avoid bosses, ribs, And the part without the thickness change of a molded object was used.
The orientation parameter (fp) of a fiber reinforced thermoplastic resin molded article or molding material was measured as an index of random arrangement of reinforcing fibers, and evaluated in the following four stages. ○○ and ○ are acceptable, and Δ and × are unacceptable.
◯: fp is “−0.15 ≦ fp ≦ 0.15”.
○: fp is “−0.25 ≦ fp <−0.15” or “0.15 <fp ≦ 0.25”.
Δ: fp is “−0.35 ≦ fp <−0.25” or “0.25 <fp ≦ 0.35”.
X: fp is “−1 ≦ fp <−0.35” or “0.35 <fp ≦ 1”.

  A specific example of the shape of the ribbed fiber-reinforced thermoplastic resin molding in the present invention is shown in FIG. FIG. 1 shows an example of a case where the fiber-reinforced thermoplastic resin molded body according to the present invention is applied to a roof part, and shows a cross section thereof. In FIG. 1, 1 shows the entire roof part as a fiber-reinforced thermoplastic resin molded body according to the present invention. In this embodiment, ribs 2 having the same cross-sectional shape are 2 on one surface (inner surface) of the molded body. One is provided. However, the number of the ribs 2 can be changed to an arbitrary number as necessary, and when a plurality of ribs are provided, the cross-sectional shape of each rib may be the same or different from each other.

  The fiber reinforced thermoplastic resin molded body constituting the roof part 1 is composed of a molded body of 15 to 80% by weight of reinforcing fibers and 20 to 85% by weight of thermoplastic resin. The reinforcing fibers (for example, carbon fibers) in the fiber-reinforced thermoplastic resin molded body are dispersed in the form of single fibers, and the dispersion into the single fibers is particularly performed using a papermaking process. The weight average fiber length (Lw) of the reinforcing fibers in the fiber reinforced thermoplastic resin molded product is in the range of 0.5 to 10 mm, and the orientation parameter (fp) of the reinforcing fibers defined as described above is −0.25. It is in the range of ˜0.25, preferably in the range of −0.15 to 0.15. And the height h of the rib 2 integrally provided on one surface of the molded body so as to extend in the direction along the surface is set in the range of 0.5 to 120 mm, preferably in the range of 10 to 60 mm. Yes.

  Further, in the transverse cross section (the cross section shown in FIG. 1) of the rib 2 in the direction perpendicular to the rib extending direction, the angle θ of the rib rising surface (rib side surface) from one surface of the molded body is On the other hand, it is in the range of 20 to 90 °, preferably in the range of 30 to 90 °. The rib width d at the top of the rib 2 is in the range of 0.5 to 200 mm, preferably in the range of 0.5 to 100 mm, and more preferably in the range of 1 to 10 mm. Moreover, thickness t of parts other than the said rib 2 of a molded object exists in the range of 0.8-10 mm, Preferably it exists in the range of 1-5 mm, More preferably, it exists in the range of 2-3.5 mm.

  By defining the shape of the molded body within such a specific range, the panel 1 made of a desired fiber-reinforced thermoplastic resin molded body can be effectively and substantially reduced in a short time by press molding using a mold. Can be molded.

  In the molding of the fiber-reinforced thermoplastic resin molding according to the present invention, as described above, it is important that the reinforcing fibers in the fiber-reinforced thermoplastic resin are dispersed into a single fiber using, for example, a papermaking process, In particular, the orientation parameter (fp) of the reinforcing fiber needs to be in the range of -0.25 to 0.25. Then, using an intermediate base material made of a preform of a fiber reinforced thermoplastic resin in which reinforcing fibers are dispersed in a single fiber shape as described above, press molding using a mold is performed, for example, in FIGS. 2 to 4 below. The first to third molding processes are performed as shown.

  FIG. 2 shows an example of the first molding process. As shown in FIG. 2, an intermediate base material 11 (in the illustrated example, a laminate of a plurality of sheet-like base materials) for forming a molded body made of reinforcing fibers and a thermoplastic resin was heated in a preheating device 12 and heated. The base material 11 is transferred into a mold 14 installed in the press device 13, and the base material 11 is pressed in the mold 14 to be molded into a predetermined shape, and then the molded base material 11 is cooled and solidified. By using such a first molding process, a fiber-reinforced thermoplastic resin molded body having a target shape can be efficiently and substantially molded once.

  FIG. 3 shows an example of the second molding process. As shown in FIG. 3, an intermediate base material 21 (in the illustrated example, a laminate of a plurality of sheet-like base materials) for forming a molded body made of reinforcing fibers and a thermoplastic resin is directly installed in the press device 22. The mold 23 is placed and placed in the mold 23, the mold 23 is heated to a temperature equal to or higher than the melting point of the thermoplastic resin (matrix resin) of the base material 21, and the base material 21 is pressed in the mold 23 to be molded into a predetermined shape. Then, the mold 23 is cooled while maintaining the press pressure of the closed mold 23, and after cooling, the mold 23 is opened and the molded body is taken out. By using such a second molding process, a fiber-reinforced thermoplastic resin molded article having a target shape can be efficiently and substantially molded at one time. In the second molding process, the mold 23 can be molded in a short time by rapid heating and rapid cooling.

  FIG. 4 shows an example of the third molding process. As shown in FIG. 4, an intermediate base material 31 (in the illustrated example, a laminate of a plurality of sheet-like base materials) for forming a molded body made of reinforcing fibers and a thermoplastic resin is heated in a preheating device 32 and pressed. The mold 34 installed in the apparatus 33 is heated to a temperature equal to or higher than the melting point of the thermoplastic resin of the base material 31, and the base material 31 heated by the preheating device 32 is transferred into the heated mold 34. The base material 31 is molded into a predetermined shape by pressing in the metal mold 34, and at the same time, the metal mold 34 is cooled and the base material 31 is cooled and solidified. By using such a third molding process, a fiber-reinforced thermoplastic resin molded article having a target shape can be efficiently and substantially molded at one time. In the third molding process, since the mold 34 is heated in advance before the base material 31 is carried in, the time required for the entire molding process can be reduced.

  Thus, the fiber-reinforced thermoplastic resin molded body according to the present invention can be efficiently molded using various molding processes, particularly the first to third molding processes described above. The fiber-reinforced thermoplastic resin molded body of the present invention is not limited to the above three molding processes, and each process such as heating and cooling of a mold can be appropriately selected.

  Thus, the fiber reinforced thermoplastic resin molding which can be shape | molded efficiently is suitable for the use for which especially the outstanding mass productivity is calculated | required. Examples of the use of the fiber-reinforced thermoplastic resin molding according to the present invention include “PC, display, OA equipment, mobile phone, personal digital assistant, facsimile, compact disc, portable MD, portable radio cassette, PDA (electronic notebook). Such as portable information terminals), video cameras, digital video cameras, optical equipment, audio, air conditioners, lighting equipment, entertainment equipment, toy products, other household appliances, etc., trays, chassis, interior members, or their cases Electrical and electronic equipment parts, civil engineering and construction material parts such as `` posts, panels, reinforcements '', `` various members, various frames, various hinges, various arms, various axles, various wheel bearings, various beams, propeller shafts, Suspension, accelerator, or steering components such as wheels, gearboxes " “Hood, roof panel, door, fender, trunk lid, side panel, rear end panel, upper back panel, front body, underbody, various pillars, various members, various frames, various beams, various supports, various rails, various hinges, etc. Outer panel or body parts "," Bumper, bumper beam, molding, under cover, engine cover, current plate, spoiler, cowl louver, aero parts, exterior parts "," instrument panel, seat frame, door trim, pillar trim " , Interior parts such as handles, various modules "or" motor parts, CNG tank, gasoline tank, fuel pump, air intake, intake manifold, carburetor main body, carburetor spacer , Various piping, various fuel systems such as various valves, exhaust systems, or intake system components ", various vehicle structural components for motorcycles," others, alternator terminals, alternator connectors, IC regulators, potentiometer bases for light vehicles , Engine coolant joint, thermostat base for air conditioner, heating hot air flow control valve, brush holder for radiator motor, turbine vane, wiper motor related parts, distributor, starter switch, starter relay, window washer nozzle, air conditioner panel switch board , Coils for fuel-related electromagnetic valves, battery trays, AT brackets, headlamp supports, pedal housings, protectors, horn terminals, step motors -Rotors, lamp sockets, lamp reflectors, lamp housings, brake pistons, noise shields, spare tire covers, solenoid bobbins, engine oil filters, ignition device cases, scuff plates, faishers, etc., various vehicle parts for motorcycles, Various aircraft parts such as landing gear pods, winglets, spoilers, edges, ladders, elevators, failings and ribs. From the viewpoint of mechanical properties, it is preferably used for electrical and electronic equipment casings, civil engineering, building material panels, automotive structural parts, and aircraft parts. In particular, it is preferably used for structural parts for automobiles and motorcycles from the viewpoint of mechanical properties and isotropy.

DESCRIPTION OF SYMBOLS 1 Roof component as a fiber reinforced thermoplastic resin molding 2 Rib 11, 21, 31 Intermediate base material 12, 32 Preheating device 13, 22, 33 Press device 14, 23, 34 Mold

Claims (8)

  A molded body comprising 15 to 80% by weight of reinforcing fibers and 20 to 85% by weight of thermoplastic resin, wherein the reinforcing fibers are dispersed in a single fiber shape, and the weight average fiber length (Lw) of the reinforcing fibers is It consists of a fiber reinforced thermoplastic resin molded product in the range of 0.5 to 10 mm, and the orientation parameter (fp) of the reinforcing fiber defined in the present specification is in the range of -0.25 to 0.25, A fiber-reinforced thermoplastic resin molded article having ribs extending in a direction along the surface on at least one surface of the molded article, wherein the height h of the rib is in the range of 0.5 to 120 mm.   The fiber-reinforced thermoplastic resin molded article according to claim 1, wherein the reinforcing fibers are dispersed into a single fiber using a papermaking process.   3. The angle θ of the rib rising surface from the one surface in a cross section in a direction perpendicular to the rib extending direction of the rib is in a range of 20 to 90 ° with respect to the one surface. Fiber reinforced thermoplastic resin molding.   The fiber-reinforced thermoplastic resin molded article according to any one of claims 1 to 3, wherein a rib width d at the top of the rib is in a range of 0.5 to 200 mm.   The fiber-reinforced thermoplastic resin molded article according to any one of claims 1 to 4, wherein a thickness t of the molded article other than the ribs is in a range of 0.8 to 10 mm.   The fiber-reinforced thermoplastic resin molded article according to any one of claims 1 to 5, wherein the reinforcing fibers include carbon fibers.   The fiber-reinforced thermoplastic resin molded article according to any one of claims 1 to 5, wherein the reinforcing fibers include glass fibers. The fiber-reinforced thermoplastic resin molded article according to any one of claims 1 to 7, which is a roof part.

Images