Sheet for fiber-reinforced resin and fiber-reinforced resin molded article using same
A technology of resin moldings and fibers, which is applied in the field of fiber-reinforced resin sheets and fiber-reinforced resin moldings. The effect of high characteristic
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Embodiment 1）
[0054] In this example, using the figure 1 A core-sheath composite fiber 10 composed of filament yarns shown in A. The conjugate fiber 10 is composed of polypropylene (PP) having a melting point of 172° C. of the core component 11 and polyethylene (PE) having a melting point of 122° C. of the sheath component 12 surrounding it. The weight ratio of PP and PE is PP / PE=65 / 35. The modulus of elasticity of the composite fiber 10 was 11 GPa, and the strength was 820 MPa. 240 of these conjugated fibers 10 were paralleled to form a multifilament with a total fineness of 1850 dtex.
[0055] Arrange the obtained multifilaments in one direction at 16 threads per inch, such as figure 2 Twisted with suture (denier: 380dtex) as shown. suture grounds figure 1 The core-sheath composite fiber yarn composed of the filament yarn shown in A is composed of polypropylene (PP) with a melting point of 172°C as a core component and polyethylene (PE) with a melting point of 122°C as a sheath comp...
Embodiment 2）
[0066] Experiments were performed on sutures. The two curtain-shaped sheets produced in Example 1 are stacked at an angle of 90° as a biaxial base material, and for making a tensile test piece, two pieces of the biaxial base material are stacked in an angularly symmetrical manner. For the material used to produce the bending test piece, four pieces of the biaxial base material were stacked in an angularly symmetrical manner. The suture thread used PP filaments (denier 380dtex, number of single fibers 60) in Experiment No. 1, and composite fiber filaments with a core component of PP and a sheath component of PE in Experiment No. 2 (mass ratio PP / PE=50 / 50, fineness 380 dtex, number of single fibers 60), in experiment No. 3, a polyester-based filament (manufactured by Teijin Corporation, trade name "Tetoron", fineness 80 dtex) was used. The fineness of the yarns of Experiment Nos. 1 to 2 was higher than that of Experiment No. 3, but this was because yarns with lower deniers cou...
Embodiment 3）
[0072] Experiments on forming pressure were carried out. The two curtain-shaped sheets produced in Example 1 are stacked at an angle of 90° as a biaxial base material, and for making a tensile test piece, two pieces of the biaxial base material are stacked in an angularly symmetrical manner. For the material used to produce the bending test piece, four pieces of the biaxial base material were stacked in an angularly symmetrical manner. As the suture thread, the same suture thread as in Example 1 was also used. The compression molding conditions are specified as: temperature 130°C, molding pressure 1-8 MPa, and molding time 5 minutes.
[0073] The above results are collectively shown in Table 3.
[0074] table 3
[0075] Forming pressure
[0076] It can be seen from Table 3 that the forming pressure is preferably 1-8 MPa, more preferably about 2-4 MPa. However, this experiment is the result of an experiment using a biaxial base material formed by laminating two cu...
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