JPH04334441A - Manufacture of gradient functional fiber reinforced thermoplastic resin formed material - Google Patents

Abstract

PURPOSE:To prevent separation due to thermal stress or other fault from developing by a method wherein a plurality of woven fabrics, which contains two kinds of thermoplastic resin fibers different in melting point and diameter from each other and at least two kinds of reinforcing fibers, are laminated to one another in the specified mode and then compression- molded. CONSTITUTION:When fourteen sheets of woven cloths prepared by mixed fiber spinning are laminated, the first to fourth layers are produced by laminating plain woven cloths F1, each of which consists of warp made of long reinforcing fiber A in the density of (m) threads/inch and weft made of thermoplastic resin fiber C in the density of (n) threads/inch, and which are sifted at right angles in the laminating planes. Further, the eleventh to fourteenth layers are also produced by laminating plain woven cloths F2, each of which consists of warp made of long reinforcing fiber B in the density of (x) threads/inch and weft made of thermoplastic resin fiber D in the density of (y) threads/inch, and which are shifted at right angles in the laminating planes. The difference between the melting points of the respective fibers C and D are set to be about 50 deg.C. A fifth, an eighth and a nineth layers, the warp and weft of which are respectively at right angles to those of the proceeding layers, are made of the cloth F2, while a sixth, a seventh and a tenth layers are made of the cloth F1. These layers are laminated to one another under the condition being shifted at right angles in the laminating planes.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced thermoplastic resin molded material having a gradient function and suitable as a structural material for various containers and pipes whose internal and external environments are significantly different.

0002

BACKGROUND OF THE INVENTION At present, methods for producing thermoplastic resin molded materials reinforced with long reinforcing fibers include methods such as extrusion lamination, pultrusion, and filament winding. In addition, fibers obtained by applying thermoplastic resin powder to reinforcing long fibers in suspension are assembled, or fibers obtained by impregnating reinforcing long fibers with a thermoplastic resin melt are assembled, and then heated. A method of heating and melting a plastic resin is known. However, in general, thermoplastic resin molded materials that use reinforcing fibers as reinforcing materials obtained by conventional methods such as extrusion lamination are hard and lack flexibility, so they cannot be used for complex products such as deep drawn products. A major problem is that it is not suitable for shaping shapes. In addition, in the method of assembling fibers in which thermoplastic resin powder is applied to reinforcing long fibers in suspension, or in the method of assembling fibers in which reinforcing long fibers are impregnated with thermoplastic resin melt, the obtained fibers and their The resulting woven fabric is very stiff and similarly difficult to handle.

[0003] In order to avoid these problems,
-14039, each of the warp and weft has at least one
A method is disclosed in which a thermoplastic resin molded material is obtained by superimposing and heating compression molding woven fabrics made of different types of thermoplastic resin fibers and at least one type of reinforcing fiber yarn. However, with this method, only a composition that is uniform in the thickness direction can be obtained.

Furthermore, a method for obtaining a thermoplastic resin molded material by combining a plurality of reinforcing fibers is disclosed in Japanese Patent Application Laid-Open No.
No. 13623. However, this method simply arranges different materials in the thickness direction;
Disadvantages include peeling due to mechanical action and thermal stress due to discontinuous changes, and distortion and warpage occurring due to differences in thermal expansion coefficients.

[0005]Also, laminate molding and multilayer film molding are known as methods for imparting multiple functions by combining multiple materials, but in these cases, the composition is discontinuous at the interface of different components. mechanical action and thermal stress can cause delamination or other defects. Also, when materials with different thermal expansion coefficients are combined, the difference in thermal expansion coefficients can cause distortion. Warping may occur.

[0006] Polymer blending methods and polymer alloying methods are generally known as methods for imparting multiple functions by combining multiple resins. However, in these methods, a method is mainly carried out in which a plurality of materials are simply used in a uniform combination.

[0007]

[Problems to be Solved by the Invention] The present invention is resistant to thermal stress and chemically stable even if the thermal, chemical, and mechanical environments are significantly different between one side and the other side. The technical objective is to obtain a thermoplastic resin molded material (composite material) that is resistant to mechanical action, is inexpensive, and does not suffer from distortion or warping.

Another object of the present invention is to provide a method for producing a fiber-reinforced thermoplastic resin molded material having a gradient function, which can be applied to molded products with complex shapes such as deep-drawn products. .

[0009] The present inventors first discovered a method consisting of thermoplastic resin fibers and reinforcing fibers, and in which one of the fibers was
By laminating textile fabrics made of different materials in the intermediate layer so that the relative content gradually changes from one side to the other, thermoplastic resin fibers are heated and melted, and compression molded. We proposed a method for manufacturing a thermoplastic resin molded material that has a gradient function in which two types of materials gradually change in the thickness direction (layering direction). However, in this case, when trying to mix multiple thermoplastic resins in fiber form so that they have a gradient by heat compression, if the melting points of the thermoplastic resins are different, the low melting point resin will melt quickly and will not work. Not only does it penetrate into the melt and disturb the formation of a gradient composition, but when the high melting point resin is heated to its melting point, the already melted low melting point resin may undergo thermal deterioration, making it impossible to achieve the desired performance. It has been found.

0010

[Means for Solving the Problems] As a result of intensive research to achieve the above technical problem, the present inventors have discovered that when constructing a knitted fabric made of two types of thermoplastic resin fibers and reinforcing fibers, , the diameter of the fibers made of a thermoplastic resin with a higher melting point is smaller than the diameter of the fibers made of a thermoplastic resin with a lower melting point, and when stacking them, in the middle layer, from one side to the other. The inventors have discovered that the desired objective can be achieved by stacking the layers so that the composition changes gradually on both sides, leading to the present invention.

That is, the present invention provides two types of thermoplastic resin fibers, the fibers made of a thermoplastic resin with a higher melting point having a smaller diameter than the fibers made of a thermoplastic resin with a lower melting point, and at least one type of reinforcing fiber. A plurality of knitted and woven fabrics consisting of fibers and having different relative contents of the two types of thermoplastic resins are made so that the relative contents of the two types of thermoplastic resins gradually change in the lamination direction (thickness direction). This is a method for producing a fiber-reinforced thermoplastic resin molded material having a gradient function, which is characterized in that the thermoplastic resin fibers are laminated, the thermoplastic resin fibers are melted, and compression molded.

The present invention will be explained in detail below.

[0013] The thermoplastic resin fiber used in the present invention refers to a fiber obtained by dissolving a thermoplastic resin with heat or a solvent, and includes, for example, polyolefins, polyesters, polyamides, polyarylates, polyphenylene sulfide, and polyphenylene ether. , polyether/etherketone, polyethersulfone, polyetherimide, polyimide, and other known thermoplastic resins such as polymers or copolymers.

[0014] Here, the diameter of the fibers is such that, of the two types of thermoplastic resin fibers used, the diameter of the fiber made of a thermoplastic resin with a higher melting point is smaller than the diameter of the fiber made of a thermoplastic resin with a lower melting point. is necessary. Moreover, 2
It is preferable that the larger the difference in melting point between different types of thermoplastic resin fibers, the smaller the diameter of the high melting point resin fibers and the larger the diameter of the low melting point resin fibers. In addition, in the thermoplastic resin fibers used, it is preferable that the larger the thermal deterioration of the low melting point resin in the melting temperature range of the high melting point resin, the smaller the diameter of the high melting point resin fiber, and the larger the diameter of the low melting point resin fiber. . For example, when the melting point difference is less than 50 degrees, the diameter of the low melting point resin is preferably 1 to 20 times the diameter of the high melting point resin;
In the case where the diameter of the low melting point resin is at least 3 times or more, preferably 5 times or more, the diameter of the high melting point resin is used.

Further, the reinforcing fibers used in the present invention are fibers that have a higher melting point than the thermoplastic resin fibers and can be used for reinforcing thermoplastic resins, such as carbon fibers,
Examples include long fibers such as glass fibers, aramid fibers, metal fibers, polybenzoxazole fibers, alumina fibers, and silicon carbide fibers.

Next, a method for obtaining a textile fabric by knitting and weaving these fibers will be explained.

[0017] Weaving is carried out using thermoplastic resin fibers and reinforcing fibers, and methods include a method of interweaving thermoplastic resin fibers and reinforcing fibers, a method of weaving thermoplastic resin fibers and reinforcing fibers, and a method of weaving thermoplastic resin fibers and reinforcing fibers. This can be done by knitting or weaving aligned or mixed yarns. Here, the method of mixing the fibers is not particularly limited, but for example, a method of spreading the fibers with air and mixing, a method of spreading the fibers in a liquid and mixing, a method of spreading the fibers with static electricity and mixing. Conventionally known methods can be used.

[0018] Furthermore, the knitted fabrics obtained here are plain weave,
It can be woven with a twill weave, a satin weave, a variation thereof, a warp knit, a weft knit, or the like. By changing the yarn usage, etc., textile fabrics with various compositions and textures can be easily obtained.

[0019]Although there are two types of thermoplastic resin fibers used here, there is at least one type of reinforcing fiber, and there may be two types.In this case, the reinforcing fibers are also thermoplastic resin fibers. Similarly, the thickness can be changed gradually in the thickness direction. In addition to this, other thermoplastic resin fibers, reinforcing fibers, and others may also be used as a third component. When using a plurality of materials, it is possible to obtain a knitted fabric having a plurality of materials by appropriately combining interweaving, alignment, blending, etc.

Furthermore, since the warp weave density and the weft weave density can be set arbitrarily, an infinite variety of woven fabrics can be obtained.

Next, the method of laminating the textile fabrics thus obtained will be explained in detail with reference to the drawings.

FIG. 1 shows an example of a method of laminating 14 woven fabrics obtained by interweaving. In this figure, from the first layer to the fourth layer, the warp yarns have a density of m warps/
Consisting of inch reinforcing long fibers A, the weft density is n pieces/
The plain weave fabric F1 made of inch thermoplastic resin fibers C (thermoplastic resin fiber diameter uμ) is laminated with the direction shifted by 90 degrees within the laminated plane, while from the 11th layer to the 14th layer The density of warp threads is x threads/inch
It is made of reinforcing long fibers B, and the weft has a density of y pieces/inch.
Thermoplastic resin fiber D (diameter vμ of thermoplastic resin fiber)
It refers to the state in which plain weave fabrics F2 consisting of the following are laminated while being shifted by 90 degrees in the same manner. Here, the difference between the melting point (TmC) of thermoplastic resin fiber C and the melting point (TmD) of thermoplastic resin fiber D is f degrees (TmC-TmD=f>50 degrees), and v/u
=w≧3. The 5th layer to the 10th layer are intermediate layers, and in this example, the 5th layer, the 8th layer, and the 9th layer are woven fabric F.
2, and the 6th layer, 7th layer, and 10th layer are woven fabric F1, and are constructed by combining the laminated arrangement of each woven fabric and laminating them while shifting them by 90 degrees within the laminated plane. ing.

[0023] The gradient here refers to the gradual change in the content ratio of the material in the thickness direction from one side to the other, and specifically in the present invention, the intermediate layer as shown above is formed. This is achieved by

[0024] Furthermore, it is more effective to vary the weave density of the woven fabric forming the intermediate layer. In the fabric F1, the number of m and the number of n are gradually reduced in this order, and the number of layers is 5th layer, 8th layer, 9th layer, 11th layer, and 1st layer.
In the four-layer woven fabric F2, it is also possible to gradually increase the number of x's and the number of y's in this order.

[0025] It is also effective to vary the thread usage in the woven fabric forming the intermediate layer. For example, instead of the woven fabric F1 of the 6th, 7th, and 10th layers, reinforcing long fibers B are arranged in the warp so that the composition does not exceed 50% of the reinforcing long fibers A, and the A woven fabric F1' in which thermoplastic resin fibers D are arranged in the weft so that the composition does not exceed 50% of the plastic resin fiber C is used instead of the woven fabric F2 of the fifth, eighth and ninth layers. The reinforcing long fibers A are arranged in the warp so that their composition does not exceed 50% of the reinforcing long fibers B, and the thermoplastic resin fibers are arranged so that their composition does not exceed 50% of the thermoplastic resin fibers D. Possible methods include laminating woven fabrics F2' in which resin fibers C are arranged in wefts.

[0026] In the lamination, each woven fabric is rotated at an angle of, for example, 45 degrees with respect to the direction of the reinforcing long fibers within the lamination plane.
It is effective to stack the layers by shifting them by 60 degrees or 90 degrees to obtain an in-plane isotropic material.

FIG. 2 shows 14 woven fabrics obtained by drawing and aligning.
An example of a method of laminating sheets is shown below. In this figure, from the first layer to the fourth layer, the warp consists of reinforcing long fibers A with a density of p fibers/inch and the thermoplastic resin fibers C with a density of r fibers/inch, and the weft yarns have a density of q fibers/inch.
Plain weave fabric F3 obtained by aligning reinforcing long fibers A of h and thermoplastic resin fibers C of density s fibers/inch is in a laminated state, while the 11th to 14th layers
Up to the layers, the warp consists of reinforcing long fibers B with a density of a fibers/inch and the thermoplastic resin fibers D with a density of c fibers/inch, and the wefts consist of reinforcing long fibers B with a density of b fibers/inch and a density of d. This figure shows a state in which plain weave fabric F4 obtained by aligning thermoplastic resin fibers D of 1/inch is laminated. In this example, the intermediate layer is a laminate of woven fabrics such that the 5th, 8th and 9th layers are woven fabric F4, and the 6th, 7th and 10th layers are woven fabric F3. It is constructed by combining arrays.

[0028] It is further effective to vary the weaving density of the woven fabric forming the intermediate layer.

[0029] It is also effective to change the thread used to align the woven fabric forming the intermediate layer. For example,
Instead of the woven fabric F3 of the 10th layer, the warp is the reinforcing long fiber A
and a woven fabric F3' obtained by aligning the reinforcing long fibers A and the thermoplastic resin fibers D, and in place of the woven fabric F4 of the fifth layer. In this case, the warp yarns are made of reinforcing fibers B and thermoplastic resin fibers D, and the weft yarns are made of reinforcing long fibers B.
It is also possible to use a woven fabric F4' obtained by aligning the thermoplastic resin fibers C.

[0030] In order to obtain an isotropic material, it is effective to laminate each woven fabric in the lamination plane so that the direction of the reinforcing long fibers is shifted by, for example, 45 degrees in the lamination plane. .

[0031] In addition, in the method for obtaining a woven fabric, a mixed yarn consisting of reinforcing long fibers and thermoplastic resin fibers, a mixed yarn consisting of reinforcing long fibers, or a mixed yarn consisting of thermoplastic resin fibers, It is also effective to use such yarns, and such yarns can be used by interweaving or aligning them.

Furthermore, in order to improve the adhesion between the reinforcing long fibers and the thermoplastic resin, it is also possible to carry out known methods such as coupling agent treatment, oxidation treatment, plasma treatment, etc. The method of application is not particularly limited, but it can be applied in the form of threads, woven fabrics, etc.

[0033] Also, the thermoplastic resin fibers C and D used
If the resins are generally incompatible, a known compatibilizing agent treatment can be carried out as necessary to improve the properties of the interface between the resins. The method of application is not particularly limited, but it can be applied in the form of a woven fabric or by kneading when obtaining thermoplastic resin fibers.

When the laminate thus obtained is heated and pressure molded, the hot press method, autoclave method and diaphragm method, which have been commonly used as molding methods for thermoplastic resin molding materials, can be used. can be used. In the case of the hot press method, it is preferable to perform the hot press while applying reduced pressure. Heating is done by raising the temperature all at once to the high melting point temperature range of the thermoplastic resin that makes up the woven fabric, then applying the desired pressure and holding it until the resin completes its flow, thereby increasing the diameter of the fibers. Even if the temperature is raised to the melting point range of small, high melting point thermoplastic resin fibers with a fast melting speed,
A thermoplastic resin with a larger diameter and a lower melting point temperature takes time for the entire fiber to reach thermal equilibrium, so it is possible to suppress the thermal decomposition of a thermoplastic resin with a low melting point as much as possible while producing a thermoplastic resin with a high melting point. It becomes possible to perform molding processing at the same time.

[0035]

[Operation] According to the present invention, the method of laminating textile fabrics is changed to make the materials different on one side and the other side,
Furthermore, by gradually changing the content of the material in the intermediate layer and heat forming them, the content of thermoplastic resin in the thickness direction gradually changes, and two types of thermoplastic resin fibers are formed. Even when the melting temperatures of thermoplastic resins differ, it is possible to easily and efficiently mold thermoplastic resins whose material changes gradually in the thickness direction, while minimizing thermal deterioration of thermoplastic resins with low melting points. The mixing state of the resins and the adhesion between the reinforcing fibers and the resin become better. When the thermoplastic resin molded material having the gradient function of the present invention obtained in this manner is used under conditions where the internal environment and the external environment of the thermoplastic resin molded material are significantly different, for example, when either side is exposed to high temperature. It becomes possible to suppress the generation of thermal stress inside the thermoplastic resin molded material as much as possible even when exposed to heat, and it also becomes possible to obtain a material that has an extremely excellent bonding effect that prevents delamination. In addition, it is possible to select a material according to the required performance of the thermoplastic resin molding material, and it is also excellent in economic efficiency. Even when it has an asymmetrical configuration, a thermoplastic resin molded material without distortion or warpage can be obtained.

[0036]

[Examples] Next, the present invention will be explained in detail with reference to Examples.

Example 1 and Comparative Example 1

[0038] Glass fiber is used as the reinforcing fiber, and PPS (polyphenylene sulfide) and N6 (
Examples and comparative examples using nylon 6) are shown below.

First, as an example, 420d/450f P
The case is shown in which PS fibers (diameter 9.8μ) and 420d/30f N6 fibers (diameter 42μ) are used. PPS fiber and N
The difference in melting point of 6 fibers is more than 50 degrees, and the difference between PPS fiber and N6 fiber is more than 50 degrees.
The fiber diameter ratio is 1:4.3.

On the other hand, as a comparative example, PPS fiber and N
420d/25 so that the ratio of diameters of 6 fibers is 1:1
The case using PPS fiber of f and N6 fiber of 420d/30f is shown.

[0041] In each case, the number of woven fabrics to be laminated is 12 in total, and the structure thereof is as follows. That is, the first to third layers have glass fibers (67
．． 5tex/800f, diameter 6μ) 45 pieces/inch,
A woven fabric consisting of 20 PPS fibers/inch is used for the weft, and glass fiber (67.5 tex) is used for the warp for the 10th to 12th layers.
/800f, diameter 6μ) 45 pieces/inch, N6 for weft
A woven fabric consisting of 20 fibers/inch was used. here,
The configurations of the fourth to ninth intermediate layers are as follows. That is, the fourth, seventh, and eighth layers are composed of the above-mentioned woven fabric having the warp glass fiber and the weft N6 fiber. Further, the fifth, sixth and ninth layers are composed of the above-mentioned woven fabrics having glass fibers as warps and PPS fibers as wefts. These woven fabrics have glass fibers aligned in the direction of 45 within the laminated plane.
Lamination was performed by shifting the layers by degrees. The woven fabrics used here were all treated with a 1% by weight aminosilane coupling agent solution.

Next, in order to compare the moldability of the laminates having the configurations shown in Example 1 and Comparative Example 1, the degree of completion of molding in a certain period of time was compared. Pressure/heat press molding conditions were as follows: under a vacuum of 10 torr, first pressurized to a pressure of 10 kg/cm2 and then heated at 12°C/min. So 3
After raising the temperature to 10° C., the pressure was increased to 30 kg/cm 2 . This state was held for 5, 10, 15, and 20 minutes, respectively, and then the temperature was increased to 15°C/min. The temperature was lowered to 50° C. at a rate of 20° C., and then the atmosphere was returned to atmospheric pressure. The results are shown visually regarding the degree of completion of molding of the obtained molded body.

[0043]

[Table 1]

The results of the bending test specified in JIS-K7055 are shown below.

[0045]

[Table 2]

The above results show that in Example 1, molding was completed 10 minutes after raising the temperature to 310°C without any influence of strength reduction due to thermal deterioration of N6, which is a low melting point component, whereas in Comparative Example 1 It can be seen that from 15 to 20 minutes after completion of molding, the influence of a decrease in strength due to thermal deterioration of the low melting point component appears.

[0047] Containers made with PPS on the inside using the method shown in the present invention do not crack or deform even when high-temperature organic solvents are placed in them, and exhibit the characteristics of PPS, which is stable against solvents and solutions. In addition to having 100 PPS
It was possible to manufacture a container with the same strength as that using 20% at a lower cost.

Example 2, Comparative Example 2

Glass fiber is used as the reinforcing fiber, and the thermoplastic resin fiber has the flame retardancy described in JP-A-61-16924, 61-55115, 61-78832, and 61-136519 (LOI=60). Examples will be shown in which polymers (hereinafter referred to as Z polymers and Z fibers) and PET (polyethylene terephthalate) fibers are used.

First, as an example, a case will be shown in which 600d/600f Z fibers (diameter 10μ) and 450d/36f PET fibers (diameter 35μ) are used. The melting point difference between Z fiber and PET fiber is 50 degrees or more, and the diameter ratio of Z fiber and PET fiber is 1:3.5.

On the other hand, as a comparative example, Z fiber and PET
600d/50f so that the fiber diameter ratio is 1:1
This shows the case using Z fiber of 450d/36f and PET fiber of 450d/36f.

[0052] In each case, the number of layers of woven fabrics to be laminated is 12 in total, and the structure thereof is as follows. That is, the first to third layers have glass fibers (67.
The first
For layers 0 to 12, the warp is made of glass fiber (67.5tex/80
A woven fabric consisting of 25 PET fibers/inch and 25 PET fibers/inch as the weft was used. Here the 4th~
The configuration of the nine-layer intermediate layer is as follows. That is, the 4th, 7th and 8th layers are made of the woven fabric shown above whose warp is made of glass fiber and whose weft is made of PET fiber, and the 5th, 6th and 9th layers are made of the woven fabric shown above whose warp is made of glass fiber and whose weft is made of PET fiber. It is composed of a woven fabric whose warp yarns are glass fibers and whose weft yarns are Z fibers. These woven fabrics were laminated by shifting the direction of the glass fibers by 45 degrees within the lamination plane. Note that the woven fabrics used here were all 1wt. % aminosilane coupling agent solution.

Next, in order to compare the moldability of the laminates having the configurations shown in Example 2 and Comparative Example 2, the degree of completion of molding over a certain period of time was compared. Pressure/heat press molding conditions were as follows: first pressurized at a pressure of 10 kg/cm2 under a vacuum of 10 torr, and heated at 10°C/min. After raising the temperature to 310° C., the pressure was increased to 30 kg/cm 2 . Hold this state for 5, 10, 15, and 20 minutes, respectively.
Thereafter, the temperature was increased to 15°C/min. The temperature was lowered to 50° C. at a rate of 20° C., and then the atmosphere was returned to atmospheric pressure. The results are shown visually regarding the degree of completion of molding of the obtained molded body.

[0054]

[Table 3]

The results of the bending test specified in JIS-K7055 are shown below.

[0056]

[Table 4]

From the above results, in Example 2, after raising the temperature to 310°C,
At 0 minutes, the molding was completed without any influence of decrease in strength due to thermal deterioration of PET, which is a low melting point component, whereas in Comparative Example 2, thermal deterioration of the low melting point component occurred at 15 to 20 minutes after molding was completed. It can be seen that the influence of the strength reduction due to

Even when a member is made in which flame approaches the Z polymer side using the method shown in the present invention, it has the characteristics of the Z polymer, which is self-extinguishing and flame retardant. It was possible to make a container at a lower cost than if it were made with the same strength as a container made of 100% aluminum.

[0059]

Effects of the Invention According to the present invention, even when two types of thermoplastic resin fibers have different melting temperatures, thermal deterioration of the thermoplastic resin having a low melting point can be suppressed as much as possible, and the thermoplastic resin material in the thickness direction can be improved. It is possible to easily and efficiently mold objects that have gradually changed, and to minimize the generation of thermal stress even when the internal and external environments are used under conditions that are significantly different (e.g., temperature). It also makes it possible to obtain a material that has an extremely excellent bonding effect that prevents delamination, and it also makes it possible to select materials according to the required performance, which is highly economical, and has an asymmetric structure. In this case, it is possible to obtain a thermoplastic resin molded material having a gradient function without distortion or warpage.

[Brief explanation of drawings]

FIG. 1 is a developed view showing a laminated state when 14 woven fabrics F1 and F2 obtained by interweaving are laminated.

[Figure 2] Woven fabrics F3 and F4 obtained by drawing 14
FIG. 3 is a developed view showing a laminated state when laminating sheets.

[Explanation of symbols]

F1 Reinforcing long fiber A (warp) and thermoplastic resin fiber C
Mixed woven fabric F2 with (weft) Reinforcing long fiber B (warp) and thermoplastic resin fiber D
(Weft) Mixed woven fabric F3 Reinforcing long fiber A, thermoplastic resin fiber C (warp)
Cloth F4 made of reinforcing long fibers A and thermoplastic resin fibers (weft) Reinforcing long fibers B and thermoplastic resin fibers D (warp)
, reinforcement long fiber B, and thermoplastic resin fiber D (weft).

Claims (1)

[Claims] 1. Two types of thermoplastic resin fibers, the fibers made of a thermoplastic resin having a higher melting point having a smaller diameter than the fibers made of a thermoplastic resin having a lower melting point, and at least one
The relative contents of the two types of thermoplastic resins are stacked in the laminating direction (thickness direction), and the relative contents of the two types of thermoplastic resins are different. A method for producing a fiber-reinforced thermoplastic resin molded material having a graded function, which comprises stacking layers so as to gradually change the structure, melting thermoplastic resin fibers, and compression molding the materials.