Random Mat And Reinforcing Fiber Composite Material
A fiber-reinforced and composite material technology, which is applied in the field of manufacturing fiber-reinforced composite materials and random mats, can solve the problems of high molding pressure, a large amount of equipment investment, high viscosity, etc., achieve excellent flowability, and omit the effect of trimming steps
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Embodiment 1
[0210] Carbon fibers obtained by widening carbon fibers "Tenax" (registered trademark) STS40-24KS (average fiber diameter, 7 μm; fiber width, 10 mm) manufactured by Toho Tenax Co., Ltd. to a width of 20 mm were used as reinforcing fibers. As the cutting device, a rotary cutter with a spiral knife of cemented carbide arranged on the surface was used. In this operation, the value of θ in the following equation (3) was 68 degrees, and the blade pitch was 8 mm so that the reinforcing fibers were cut to a length of 8 mm:
[0211] Fiber length of reinforcing fiber (insert pitch) = (width of reinforcing fiber strand) × tan(90-θ) (3)
[0212] (where θ represents the angle between the circumferential direction and each knife)
[0213] As a fiber opening device, double pipes were prepared by welding sleeves made of SUS304 having different diameters. A small hole is formed in the inner tube, and compressed air is supplied to the space between the inner tube and the outer tube by a comp...
Embodiment 2
[0229] Carbon fiber "Tenax" (registered trademark) IMS60-12K (average fiber diameter, 5 μm; fiber width, 6 mm) manufactured by Toho Tenax Co., Ltd. was used as the reinforcing fiber. The same rotary cutter as in Example 1 with a blade pitch of 8 mm was used as the cutting device. For the purpose of obtaining smaller fiber bundles, blades parallel to the fiber direction were provided to the rotary cutter at intervals of 0.8 mm. Using the same fiber opening equipment as in Example 1, the wind speed of the air discharged through the small holes was set at 100 m / sec. The tube is placed immediately below the rotary cutter, and the tapered tube is welded to its lower portion. Matrix resin is supplied from the sidewall of the tapered tube. PA66 fiber (T5 nylon, manufactured by Asahi Kasei Fibers; denier, 1,400 dtex) dry-cut to 2 mm was used as a matrix resin. Subsequently, the same platform movable in the XY directions as in Example 1 was set below the outlet of the tapered pipe, ...
Embodiment 3
[0235] As in Example 1, carbon fibers obtained by widening carbon fibers "Tenax" (registered trademark) STS40-24KS (average fiber diameter, 7 μm; fiber width, 10 mm) manufactured by Toho Tenax Co., Ltd. to a width of 20 mm were used as reinforcing fibers. Two rotary cutters (cutting devices a and b) provided with carbide spiral knives on their surfaces were used as cutting devices. In the cutting device a, the value of θ in formula (3) and the blade pitch were set to 45 degrees and 20 mm, respectively, so that the reinforcing fiber could be cut to a fiber length of 20 mm. In the cutting device b, the value of θ in formula (3) and the blade pitch were set to 68 degrees and 8 mm, respectively, so that the reinforcing fiber could be cut to a fiber length of 8 mm.
[0236] Also regarding the fiber opening device, two sleeves each the same as in Embodiment 1 were prepared and placed immediately below the cutting devices a and b, respectively. In this stage, the wind speed of the ...
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Abstract
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