Abstract: In a brake system for a linear actuator comprising: a pair of guide rail members (4), a table (3) including at least a pair of sliders (2a to 2d) which slide along the guide rail members, a linear motor (6 and 7) for actuating the table along the guide rail members, and a brake unit incorporated in one of the sliders, the one slider is provided with a moveable slide block (16) that is supported by the slider (2a) so as to be moveable toward and away from the guide rail surface and a power actuator (8a and 8b, 21 and 30) for selectively moving the slide block toward the guide rail surface. The sliders thus serve the dual purposes of guiding the motion of the table along the guide rail and braking the motion of the table.

Abstract: The present invention provides a reinforced non-woven fabric comprising a web containing at least 15% by weight of composite fiber composed of a low-melting component and a high-melting component, the low-melting component forming at least a part of the external fiber surface, first reinforcing fibers arranged obliquely to the lengthwise direction of the web, and second reinforcing fibers crossed with the first reinforcing fibers for symmetric arrangement relative to the lengthwise direction of the web, the first and second reinforcing fibers containing at least 15% by weight of hot-melt-adhesive fiber hot-melt-adhered in the heat treatment conducted for forming the non-woven fabric at a temperature between the melting point of the high-melting component and that of the low-melting component of the hot-melt-adhesive composite fiber.

Abstract: A process for producing a non-woven fabric of hot-melt-adhered composite fibers having a high strength in a small weight thereof and soft feeling is provided, which process comprises forming a web of fiber aggregate consisting of sheath and core type composite fibers alone composed of a first (core) component of a fiber-formable polymer and a second (sheath) component of one kind or more of polymers having a m.p.(s) lower than that of the first by 30.degree. C. or more and also having a specified average thickness, or mixed fibers of the composite fibers with other fibers containing the composite fibers in a specified amount; and heat-treating the web at a temperature lower than the m.p. of the first component and equal to or lower than that of the second, and affords to the second, a specified apparent viscosity as measured at a specified rate to thereby stabilize the form of the web by hot-melt-adhesion of the second.

Abstract: A non-woven fabric of hot-melt-adhesive composite fibers having a specified small weight per unit area and soft feeling is provided which fibers are obtained by forming a fiber aggregate consisting of hot-melt-adhesive composite fibers of a specified fineness, alone, composed of as a first component, a polyethylene resin composition (C) consisting of (A) a straight chain, low density polyethylene and (B) another kind of polyethylene, in a specified proportion, and having a specified density and a specified ratio of its melt indexes after and before spinning, and as a second component, a fiber-formable polymer having a m.p.

Abstract: A process for producing side-by-side type composite fibers made of polypropylene-polyethylene which do not have hardly any crimp nor latent crimpability is provided. In said process, a composite spinning is carried out by melt-extrusion by using, as composite components of side by side type, crystalline polypropylene of an intrinsic viscosity (I.V.) of 1.45.about.2.15 and high density polyethylene of I.V. of 0.85.about.1.05 under a condition satisfying the relationship of 10,500.gtoreq.DX V.gtoreq.5,139 (V: take-up speed (m/min); D: denier of taken up unstretched fibers); and stretching the resulting filaments to 3.about.5 times the original length at a temperature of 90.degree. C. or higher.

Abstract: Heat-adhesive side-by-side type composite fibers consisting of a component composed mainly of a crystalline polypropylene and a component composed mainly of an olefin polymer, having few naturally developed crimps and few latent crimpability and superiority in undetachability of the composite components, are produced by using two composite components having a specified relationship of melt flow ratio and by stretching unstretched composite fibers at a specified temperature range.

Abstract: Molding tobacco filters having a variety of cross-sections which are practically useful in providing various preferable effects such as improvement in pressure drop, balanced adsorption of smoke component or the like, are provided according to a method which is characterized in forming fiber bundles of composite fibers consisting of a first and a second component by themselves, or a mixture of at least 20% by weight (based upon the total fiber mixture) of said composite fibers and another kind of fibers so as to give a variety of cross-sections to said fiber bundles, and subjecting said fiber bundles to heat-treatment at a temperature lower than the melting point of the first component but higher than the melting point of the second component to stabilize the structure by the self-adhesion of the second component; the first component of a fiber forming polymer and the second component consisting of one or more kinds of polymer having a melting point lower than that of the first component by 10.degree. C.

Abstract: A porous non-woven fabric having a good dimensional stability and uniformity is prepared from a web obtained by arranging side-by-side composite fibers alone or a blend thereof with another fibrous material into a web and heat-treating the resulting web at a specified temperature, said composite fibers having few naturally developed crimps and being obtained by stretching unstretched side-by-side composite fibers consisting of a polypropylene component and an olefin polymer component having a specified melting point and a specified melt flow rate.

Abstract: Tobacco filters having uniform hardness and small pressure drop which give uniform flow of smoke can be obtained by forming bundles of fibers consisting of 20-100% by weight of composite fibers based upon the total amount of mixed fibers of said composite fibers and 80-0% of other fibers, subjecting said composite fibers to heat treatment at a temperature lower than the melting point of the first component and higher than the melting point of the second component and stabilizing said fiber bundles by the self adhesion of the second component, said composite fibers having side-by-side or sheath and core arrangement of the first component consisting mainly of crystalline polypropylene or propylene copolymer mainly of propylene and the second component consisting of (1) an ethylene-vinyl acetate copolymer having a vinyl acetate content of 0.

Abstract: A novel and time saving method for assessing bactericidal activities of antibiotics on agar plates is described. Minimal inhibiting concentrations (MIC) are determined by the agar dilution method. An antibiotic inactivating enzyme solution is sprayed onto the plates to inactivate the antibiotic. After further incubation, the minimal concentration at which no visible growth occurred on the plates is determined and is defined as minimal bactericidal concentration (MBC).