Abstract: A resin shock absorber comprising a compression deformable portion made of a resin having a flexural modulus of elasticity of 500 to 20,000 kg/cm.sup.2, said shock absorber having a yield strength of 2 to 25 kN/m.sup.2 and a compressive energy absorption efficiency of 50% or higher. The shock absorber of the present invention has a high energy absorption efficiency for its reaction force, superior restorability, and is maintenance-free since the absorber has resistance against corrosion, water and weather. Therefore, the absorber is applicable to the use in the sea, on the ground, as well as above the ground. Furthermore, the shock absorber can be easily extended on demand into a block shock absorber, which is light in weight and simple in structure and capable of exhibiting uniform cushion characteristics over an extended area.

Abstract: A fiber-reinforced polymer blend composition comprising (a) a polyamide resin, (b) a modified polypropylene resin having a melt flow index of 1 to 50 g/10 minutes and at least one carboxyl group in the molecule and (c) a fiber-reinforcing agent, the weight ratio of the polyamide resin (a) and the polypropylene resin (b) being from 70:30 to 95:5 and a content of the fiber-reinforcing agent (c) being from 50 to 200% by weight on the basis of the total amount of the polyamide resin (a) and the polyprolylene resin (b), which is excellent in heat resistance, water resistance, impact resistance and surface resistance.

Abstract: Method and apparatus suitable for producing a spun yarn at high speed from short fibers less than 50 mm. in length. A bundle of fibers having a particular thickness distribution in its width direction is supplied through a fluid jet false-twist nozzle in which a throttle portion connecting the upstream and downstream portions of the yarn passageway is provided non-eccentrically or eccentrically with respect to the downstream portion, and the downstream portion has a fluid conduit opening eccentrically there into and inclined toward the outlet end of the downstream portion. Air preferably containing water at room temperature in the form of mist is used as the fluid jetted through said nozzle.