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: The object of the present invention is to provide optically readable mark recorded media, which can be permanently used to some extent with high durability against the mechanical forces applied by repeated washing, and can be read by optical readers accurately with few errors as essentially required for identification marks.

Abstract: The present invention relates to fabrics having a special structure, methods of producing the fabrics, and various articles including clothes comprising such fabric. Specifically, the fabrics of the invention are characterized in that many narrow strips forming an overlapping structure are combined together so that each overlap between adjacent narrow strips provides an opening in the width direction of the strips. The methods of producing the fabrics are characterized in that narrow strips are put one on top of another while slightly shifting the positions thereof to form an overlapping structure, followed by combining the adjacent narrow strips while maintaining the overlap. Where used as material for clothes, for instance, these fabrics produce clothes that prevent the skin of the wearer from being exposed directly to sunlight and rain and have unique features including a high fashionability and a high air permeability ensuring a good ventilation.

Abstract: A carrier for cell culture comprising ultra fine fibers with a fineness of not more than 1.0 denier. The carrier makes it possible for the cells to retain their differentiation and proliferation ability for a long time. It also enables a large scale culturing.

Abstract: The present invention relates to a novel method and apparatus for producing nonwoven fabrics. Generally, in production of nonwoven fabrics, in order to obtain a nonwoven fabric with a wide width, it has been impossible to obtain a uniform nonwoven fabric unless a large number of spinnerets ejecting fibers are installed in the width direction of the nonwoven fabric. The present invention relates to a novel method and apparatus for producing nonwoven fabrics capable of easily increasing the width of the fabric even when only few spinnerets are used.

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: The invention relates to the alternate high-molecular arrangements manufactured through apparatus wherein the layers of at least two component high-molecular fluids are formed into layers and so combined with another high-molecular fluid that the former's layers intersect the latter's and the combined flow of the layers is divided into a number of layers.In accordance with the invention, islands in alternate high-molecular arrangements can be increased to a high ratio easily and economically.

Abstract: A napped sheet has a pattern thereon formed by the sharp contrast between an area with a nap surface and an area with a reversed nap surface on which nap ends are reversed and extend into the inner part of the sheet.A process for producing the sheet includes the step of first raising a fiber sheet and next impinging a high-pressure columnar fluid jet stream on part of the fiber sheet.The product of the invention is soft, strong and beautiful, and has good durability. The production process is simple and inexpensive.

Abstract: An artificial blood vessel comprises a woven, braided or knitted fabric structure. Fibers so extend from a surface of the fabric structure as to be randomly intertwined with the fabric structure. The intertwining of the fibers with the fabric structure can be achieved by applying a high fluid pressure against a surface of the fabric structure.

Abstract: The present invention relates to an artificial vascular graft having ultra fine fibers smaller than 0.5 denier in fineness as part of the inner wall. The artificial vascular graft of this invention is very flexible and produces very low blood leakage. The ease of performing anastomoses is greatly improved. Because of the ultra fine fiber there are many sites to which live cells adhere, the adaptability of the live cells to the fibers of the vascular graft increases, an excellent antithrombotic effect is exerted by the vascular graft, and the formation of the endothelial cells is satisfactory and is observed at a very early stage.

Abstract: The invention relates to the alternate high-molecular arrangements manufactured through the processes wherein the layers of at least two component high-molecular fluids are formed into layers and so combined with another high-molecular fluid that the former's layers intersect the latter's and the combined flow of the layers is divided into a number of layers, to the processes and to the systems therefor.In accordance with the invention, the islands in alternate high-molecular arrangements can be increased to a high ratio much easily and economically.

Abstract: Improved ultrafine sheath-core composite fibers and composite sheets composed of these fibers are disclosed. The composite fibers have a fineness of 0.0001 to 0.5 denier and comprises 10 to 70% of the core having a very high intrinsic viscosity within a specific range and being located at the center of the sheath and 90 to 30% of the sheath composed of a polyester copolymerized 1.5 to 8 mole %, based on the total acid component, of 5-sodium (or lithium or potassium) sulfoisophthalate and having a thickness of 0.04 to 2 microns. The composite fibers have a high strength and are dyeable with a cationic dye. When the composite fibers are combined with an elastic material such as polyurethane, suede-like artificial leathers having excellent softness, touch, feel and color can be obtained.

Abstract: Improved ultrafine sheath-core composite fibers and composite sheets composed of these fibers are disclosed. The composite fibers have a fineness in the range of 0.0001 to 0.5 denier and a core/sheath weight ratio in the range of 10/90 to 70/30. The core has a very high intrinsic viscosity within a specific range and is located at the center of the sheath. The sheath is composed of a polyester copolymerized with 1.5 to 8 mole % of 5-sodium (or lithium or potassium) sulfoisophthalate, based on the total acid component, of 5-sodium (or lithium or potassium) sulfoisophthalate and having a thickness of 0.04 to 2 microns. The composite fibers have a high strength and are dyeable with a cationic dye. When the composite fibers are combined with an elastic material such as polyurethane, suede-like artificial leathers having excellent softness, touch, feel and color can be obtained.

Abstract: The present invention relates to an artificial grain leather having different color spot groups comprised of ultra fine fibers, in which at least one side of the fibrous substrate has two types of colors differing in hue and/or lightness value and being covered with transparent resin layers.The present invention produces a three-dimensional surface effect and a grain pattern effect, and is recognized as consisting of a mixture of ultra fine fibers each being quite different in color from the next, though providing the appearance of a single color from a distance, and producing a subdued and rich appearance as a result of the integration of colors by the color of a coating layer.

Abstract: Melange-colored sheet and method. The sheet has an inner portion having ultrafine fiber bundles and/or multi-core fibers. The surface of the sheet is composed of super-entangled ultrafine fibers and/or fine bundles of ultrafine fibers of different colors, branched from the fibers of the inner portion, so that the surface presents a melange-colored effect of at least two colors.

Abstract: An improved chenille woven or knitted fabric utilizing at least a chenille yarn composed of synthetic fibers, wherein raised fibers forming a raised fiber portion of the chenille yarn are composed of ultra-fine fibers having a fineness smaller than 0.9 denier and the rising angle .alpha. between the axis of the raised fibers and the longitudinal axis of the chenille yarn is not larger than 50.degree..This chenille woven or knitted fabric has a very smooth surface touch and a silk-like high-grade luster. Since almost no raised fine fibers are removed, this fabric is excellent in durability.

Abstract: A fabric comprising an aggregation of a plurality of bundles of superfine filaments, each such bundle being obtained by separating multi-component composite filaments is provided. Each such bundle has at least two different kinds of superfine filaments, one such kind of superfine filament being dispersed without maldistribution in the bundle. The respective kinds of superfine filaments have a difference in coefficient of free contraction of at least 5%, or one kind of superfine filament is a single component filament and the other kind of superfine filament is a bicomponent type filament. Also provided is a method of making a bundle of puffy superfine filaments.

Abstract: A fur-like synthetic sheet material is provided with numerous superfine synthetic pile fibers having fineness or thickness of about 0.0001 to 0.4 denier. The pile fibers, which are comparatively long, have crimps and are formed into bundle groups, while the crimps of the pile fibers are substantially in phase within each bundle.

Abstract: In a methd for producing a soft sheet material containing thinned fibers or filaments and a viscoelastic substance, the improvement comprising:(A) applying a mixture of a viscoelastic substance and a temporary filler to a sheet material containing thinnable fibers or filaments;(B) thinning the thinnable fibers or filaments forming said sheet material;(B') applying temporary filler to said sheet material or relocating said temporary filler applied previously at step (A) within said sheet material, whenever necessary;(C) applying a viscoelastic substance;(D) removing said temporary filler; and(E) napping the sheet, whenever necessary.In accordance with the present invention, it is possible to obtain a leather-like sheet material which, though soft, has good mechanical properties such as high abrasion resistance and high tear strength. A leather-like sheet material is produced which is free from deficiencies such as low abrasion resistance and tear strength even where the thickness is further reduced.

Abstract: A composite filament having an "islands-in-sea" type cross-sectional configuration having at least two kinds of islands, wherein the two islands are different in coefficient of contraction by at least 5%, or wherein one of the island components comprises a bimetal-type or eccentric-type composite filament. These island components are relatively well distributed throughout the sea component and the sum of the weight of the island components is greater than the weight of the sea component. Said composite filament may be made into a fabric as a filament of an ordinary denier. It is also possible to obtain a superfine fiber product being bulky or having an improved feel by superfining and heat-treating said filament thereafter.