Abstract: Intermediate polyester fibre and method for the production thereof, characterized in that highly oriented undrawn polyester yarn with a degree of crystallinity in a specified range is passed under a tension of 0.3×10−2 g/d to 5.0×10−2 g/d through a non-contact heater of heater temperature at least 250° C., and 5-40% shrinkage effected, giving the following properties (A): (1) Specific gravity 1.335-1.360 (g/cm3), (2) Degree of crystallinity 21-26%, (3) Crystal size in terms of Miller index (010) 1.4-2.2 nm, in terms of Miller index (100) 1.4-2.5 nm and in terms of Miller index (105) 1.6-3.5, (4) Degree of crystal orientation no more than 75% in the 010 plane and no more than 85% in the 105 plane, and (5) Degree of amorphous orientation 0.15-0.

Abstract: The present invention relates to a polyester product excellent in resilient elasticity, shape retainability and shape stability, and a process for producing the same. The invention provides a polyester product with high resilient elasticity, shape retainability, and shape stability, which is produced by heat-treating a product comprising polyester fibers or a film prepared by taking up a molten polyester at a take-up speed of 2000 m/min to 4000 m/min, in wet heat and/or dry heat at not lower than 120° C. with the product maintained in a loose or constrained condition without being drawn. The product is very suitable, for example, as a collar interlining cloth of a shirt, a base fabric of a shirt, or a fabric of a lady's dress, etc.

Abstract: A fiber-reinforced foamed material comprises a foamed body of a resin having a flexural elasticity modulus not smaller than 150 kg/mm.sup.2, reinforcement fibers, and a bonding component through which the reinforcement fibers are integrated with the foamed body so as to reinforce the foamed body.A method for producing a fiber-reinforced foamed material comprises the steps of: providing a material having a potential foamability; providing a composite fibrous material in the form of composite fibers and/or composite yarns each having a first component and a second component; and allowing the foamable material to foam together with the composite fibers or composite yarns at a temperature 10.degree. C. or more higher than the thermal deformation temperature or melting temperature of the first component and 20.degree. C.

Abstract: A composite sheet comprising a fiber base and a binder, wherein said binder is broken into small fragments which adhere to the fibers, but at least some not to each other.Said composite sheet is produced by a method comprising the step of (a) applying a binder to a fiber base and (b) directing a fluid jet stream to the fiber base during or after coagulation of the binder applied thereto.The composite sheet of this invention is very soft and has considerable strength, because the fluid jet breaks weak portions of the binder only to divide the binder into small fragments, without breaking the tougher portions of the binder which mainly contribute to the strength of the leather.