Carbon fiber woven fabric, its weaving method and weaving apparatus

Claim 2

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least is warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness ranging from 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.4 mm., a weight of woven fabric ranging from 100 to 300 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfies the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, in which W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (1.6 to 3.5) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 3

The prepreg according to claim 1, wherein the matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 4

The prepreg according to claim 2, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix resin is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 5

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness ranging from 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.3 mm, and the weight of woven fabric ranging from 90 to 200 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfies the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 2.0) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 6

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness ranging from 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.3 mm, and the weight of woven fabric ranging from 90 to 200 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfies the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 2.0) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 7

The prepreg according to claim 4, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 8

The prepreg according to claim 5, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 9

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and consisting of a plurality of layers of flat, unit carbon fiber yarn, the number of carbon fibers of the unit carbon fiber yarn ranging from 3,000 to 12,000, a yarn size ranging from 1,500 to 10,000 deniers, a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, and a ratio of yarn width to yarn thickness ranging from 30 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 100, a ratio of the weaving yarn pitch to the yarn width ranging from 1.0 to 1.2, a woven fabric thickness ranging from 0.2 to 0.6 mm, a weight of woven fabric ranging from 200 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns which satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (2.0 to 4.2) D: Yarn size of the carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns.

Claim 10

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and consisting of a plurality of layers of flat, unit carbon fiber yarn, the number of carbon fibers of the unit carbon fiber yarn ranging from 3,000 to 12,000, a yarn size ranging from 1,500 to 10,000 deniers, a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, and a ratio of yarn width to yarn thickness ranging from 30 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 100, a ratio of the weaving yarn pitch to the yarn width ranging from 1.0 to 1.2, a woven fabric thickness ranging from 0.2 to 0.6 mm, a weight of woven fabric ranging from 200 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns which satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (2.0 to 4.2) D: Yarn size of the carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns.

Claim 11

The prepreg according to claim 7, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 12

The prepreg according to claim 8, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix resin is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 13

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness ranging from 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.4 mm, and a weight of woven fabric ranging from 100 to 300 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and yarn size of said carbon fiber yarn satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (1.6 to 3.5) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 14

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness ranging from 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.4 mm, and a weight of woven fabric ranging from 100 to 300 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and yarn size of said carbon fiber yarn satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (1.6 to 3.5) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 15

The carbon fiber reinforced plastic according to claim 10, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 16

The carbon fiber reinforced plastic according to claim 11, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix resin is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 17

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof is 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, is unidirectional woven fabric having a yarn thickness of 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness of 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.3 mm, and the weight of woven fabric ranging from 90 to 200 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfies the relationship given in the formula shown below and also the cover factor is in the range of 95 to 100% wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 2.0) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 18

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof is 6,000 to 24,000, the yarn size being from 3,000 to 20,000 deniers, the yarn width being from 4 to 16 mm, the yarn thickness being from 0.07 to 0.2 mm, and the ratio of yarn width to yarn thickness being from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, is unidirectional woven fabric having a yarn thickness of 0.07 to 0.2 mm, a ratio of yarn width to yarn thickness of 30 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.3 mm, and the weight of woven fabric ranging from 90 to 200 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfies the relationship given in the formula shown below and also the cover factor is in the range of 95 to 100% wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 2.0) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 19

The carbon reinforced plastic of claim 13, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 20

The carbon fiber reinforced plastic according to claim 14, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof being 3.5 to 10%, or when said matrix is a thermoplastic resin, the tensile break elongation thereof being 8 to 200%.

Claim 21

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and consisting of a plurality of layers of flat, unit carbon fiber yarn, the number of carbon fibers of the unit carbon fiber yarn ranging from 3,000 to 12,000, a yarn size ranging from 1,500 to 10,000 deniers, a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, and a ratio of yarn width to yarn thickness ranging from 30 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of the yarn width to yarn thickness ranging from 20 to 100, a ratio of the weaving yarn pitch to the yarn width ranging from 1.0 to 1.2, a woven fabric thickness ranging from 0.2 to 0.6 mm, a weight of woven fabric ranging from 200 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns which satisfy the relationship given in the formula shown below and also the cover factor is in the range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (2.0 to 4.2) D: Yarn size of the carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns.

Claim 22

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and consisting of a plurality of layers of flat, unit carbon fiber yarn, the number of carbon fibers of the unit carbon fiber yarn ranging from 3,000 to 12,000, a yarn size ranging from 1,500 to 10,000 deniers, a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.2 mm, and a ratio of yarn width to yarn thickness ranging from 30 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn having a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of the yarn width to yarn thickness ranging from 20 to 100, a ratio of the weaving yarn pitch to the yarn width ranging from 1.0 to 1.2, a woven fabric thickness ranging from 0.2 to 0.6 mm, a weight of woven fabric ranging from 200 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 , and wherein said weight of woven fabric and the yarn size of said carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns which satisfy the relationship given in the formula shown below and also the cover factor is in the range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (2.0 to 4.2) D: Yarn size of the carbon fiber yarn consisting of a plurality of layers of unit carbon fiber yarns.

Claim 23

The carbon fiber reinforced plastic of claim 16, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 24

The carbon fiber reinforced plastic according to claim 17, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix resin is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 25

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 36,000, the yarn size from 3,000 to 30,000 deniers the yarn width from 4 to 16 mm, the yarn thickness from 0.07 to 0.6 mm, and the ratio of yarn width to yarn thickness from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.6 mm a weight of woven fabric ranging from 90 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 .

Claim 26

A prepreg which comprises a carbon fiber woven fabric which is infiltrated with a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 36,000, the yarn size from 3,000 to 30,000 deniers the yarn width from 4 to 16 mm, the yarn thickness from 0.07 to 0.6 mm, and the ratio of yarn width to yarn thickness from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.6 mm a weight of woven fabric ranging from 90 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 .

Claim 27

The prepreg according to claim 19 wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 28

The prepreg according to claim 20, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix is a thermoplastic resin, the tensile break elongation thereof is 8 to 200%.

Claim 29

The prepreg according to claim 21, wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 3.5) D: Yarn size of the warp or weft which are carbon fiber yarn.

Claim 30

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, wherein said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 36,000, the yarn size from 3,000 to 30,000 deniers the yarn width from 4 to 16 mm, the yarn thickness from 0.07 to 0.6 mm, and the ratio of yarn width to yarn thickness from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.6 mm, a weight of woven fabric ranging from 90 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 .

Claim 31

A carbon fiber reinforced plastic which includes a carbon fiber woven fabric and a matrix resin of 30 to 67% by weight, said carbon fiber woven fabric comprising a flat carbon fiber yarn consisting of many carbon fibers as at least its warp or weft, wherein said flat carbon fiber yarn being twist-free and the number of carbon fibers thereof being 6,000 to 36,000, the yarn size from 3,000 to 30,000 deniers the yarn width from 4 to 16 mm, the yarn thickness from 0.07 to 0.6 mm, and the ratio of yarn width to yarn thickness from 20 to 150, and said carbon fiber woven fabric using said flat carbon fiber yarn which has a yarn width ranging from 4 to 16 mm, a yarn thickness ranging from 0.07 to 0.6 mm, a ratio of yarn width to yarn thickness ranging from 20 to 150, a ratio of the weaving yarn pitch between the warps and between the wefts to said yarn width ranging from 1.0 to 1.2, a fabric thickness ranging from 0.1 to 0.6 mm, a weight of woven fabric ranging from 90 to 500 g/m 2 , and a fiber density of woven fabric ranging from 0.8 to 1.2 g/cm 3 .

Claim 32

The carbon fiber reinforced plastic of claim 23, wherein said matrix resin is a thermosetting resin or a thermoplastic resin.

Claim 33

The carbon fiber reinforced plastic according to claim 25, wherein when said matrix resin is a thermosetting resin, the tensile break elongation thereof is 3.5 to 10%, or when said matrix is a thermoplastic resin, the tensile break elongation thereof being 8 to 200%.

Claim 34

The carbon fiber reinforced plastic according to claim 25, wherein said weight of woven fabric and the yarn size of said carbon fiber yarn satisfy the relationship given in the formula shown below and also the cover factor is in a range of 95 to 100%, wherein W=k·D.sup.1/2 where W: Weight of woven fabric k: Proportional constant (0.9 to 3.5) D: Yarn size of the warp or weft which are carbon fiber yarn.