Toray Industries, Inc.

Kazuma Ura

Satoshi Seike

Mitsuki Fuse

Akihiko Matsui

Masaru Tateyama

Hiroshi Hirano

Tetsuya Motohashi

A reinforcing fiber bundle is a continuous reinforcing fiber bundle having a length of at least 1 m and is characterized by the number of monofilaments per unit width being at most 1,600/mm and the average number of fibers in the bundle being at most 1,000 in a region (I), and the drape level found in a region (II) being 120-240 mm. The continuous reinforcing fiber bundle has a length of at least 1 m and is characterized by the adhesion amount of a sizing agent (I) in the region (I) being 0.5-10% by weight and the drape level found in the region (II) being 120-240 mm. The continuous reinforcing fiber bundle has superior mechanical properties, formability into complex shapes, and continuous producibility.

Reinforcing fiber bundle

A fiber-reinforced resin material used for molding a fiber-reinforced resin which includes a matrix resin and reinforcing fiber bundles A including chopped fiber bundles each including 100 or more single fibers, wherein the product of an average porosity within fiber bundles P(−) and an average fiber bundle thickness t(mm) is 0 mm or more and 0.01 mm or less and a porosity of composite P(−) is 0.02 or more and 0.4 or less, and a method for producing the same. The fiber-reinforced resin material is a molding material excellent in terms of productivity and reduction in LCA, which can give high mechanical properties to a molded article using the molding material and further which is excellent also in flowability during molding.

Fiber-reinforced resin material and production method therefor

A partially separated fiber bundle includes a separated fiber section and an unseparated fiber section, being configured to give a ratio A/Aof 1.1 or larger and 3 or smaller, when the number of fiber bundles contained in the width direction of the partially separated fiber bundle (fiber separating number: N) measured at a freely selected point P(where, n represents an integer of 1 to 100, and freely selected points Pand P, excluding n=100, being 50 cm or more away from each other), is divided by a full width of Wof the partially separated fiber bundle, to calculate the fiber separating number per unit width A, and assuming its maximum value as Aand its minimum value as A.

Partially separated fiber bundle and method of manufacturing same

A reinforcing fiber mat includes reinforcing fiber bundles having an average fiber length of 5 mm to 100 mm, wherein reinforcing fiber bundles consisting of 86 or more fibers per bundle are contained at a weight content of more than 99 wt % to 100 wt % and the reinforcing fiber bundles contain single yarns by 500 fibers/mm-width or more and 1,600 fibers/mm-width or less and have a drape level of 120 mm or more and 240 mm or less.

Reinforcing fiber mat, and fiber-reinforced resin forming material and method of producing same

A partially separated fiber bundle having a surface of a reinforcing fiber coated with a sizing agent containing a water-soluble polyamide-based resin, in which a separated fiber section consisting of a plurality of separated fiber bundles and an unseparated fiber section are provided alternately along a longitudinal direction of the reinforcing fiber bundle consisting of a plurality of single yarns, wherein the reinforcing fiber bundle contains 600 fibers/mm or more and less than 1,600 fibers/mm of fibers per unit width while the reinforcing fiber has a drape level of 120 mm or more and 240 mm or less.

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Nagoya, Japan

Kazuma Ura