Abstract: A tire noise reducing system comprises a pneumatic tire with a hollow, a wheel rim on which the tire is mounted so that said hollow forms a closed cavity, and a noise damper disposed in the closed cavity, wherein the noise damper is formed by fixing a strip of a porous material to the tire or wheel rim, the noise damper has a volume in a range of from 0.4 to 20% of the volume of the cavity, the noise damper has a sectional shape substantially constant in the tire circumferential direction, and the pneumatic tire comprises a tread portion provided with tread grooves defining a tread pattern having a sea ratio of 20 to 35%.

Abstract: A method and an apparatus for generating gas bubbles, which can generate a large amount of micro gas bubbles having diameters of less than 15 ?m, specifically less than 10 ?m, in a liquid. The apparatus comprises a tube 2 having a closed end 14 at one end and an open end 15 at the other end, and a rotating bladed wheel 3 installed in the tube 2 and rotating coaxially or substantially coaxially with the tube 2. The rotating bladed wheel 3 has one or more blades 4. The face of each blade 4 is substantially parallel to the axis of a rotating shaft 5 of the rotating bladed wheel 3. Ventilation resistance between the interior of the tube 2 on the side near the closed end 14 and the outside gas is equal to or larger than that of a ventilation port 7 having an inner diameter of 0.36 time an average width d of the blades and a length of 3 mm. At least the open end 15 of the tube 2 and the rotating bladed wheel 3 are immersed in a liquid 20 and the rotating bladed wheel 3 is rotated at a peripheral speed of 5.

Abstract: A tire comprises a sidewall provided with a mark region for displaying at least one mark including at least one of a sold mark and an outline mark, the mark region is provided with serration made up of serration slots and ridges which are drawn up in lines, the mark is formed by discontinuous parts of the serration, wherein the discontinuous parts of the serration are (1) discontinuous parts of serration slots only or (2) discontinuous parts of ridges only or (3) discontinuous parts of serration slots and discontinuous parts of ridges, wherein the discontinuous part of the serration slot is a shallow part formed within the serration slot and having a top face extending across a corresponding part of the mark in substantially parallel with a tire sidewall surface.

Abstract: A tire comprises a sidewall provided with a mark region for displaying at least one mark including at least one of a sold mark and an outline mark, the mark region is provided with serration made up of serration slots and ridges which are drawn up in lines, the mark is formed by discontinuous parts of the serration, wherein the discontinuous parts of the serration are (1) discontinuous parts of serration slots only or (2) discontinuous parts of ridges only or (3) discontinuous parts of serration slots and discontinuous parts of ridges, wherein the discontinuous part of the serration slot is a shallow part formed within the serration slot and having a top face extending across a corresponding part of the mark in substantially parallel with a tire sidewall surface.

Abstract: A bead portion of a tire has a short fiber reinforcing rubber layer extending along a side surface of a rubber bead apex from a bead core to a height position which is lower than the radially outer end of the bead apex rubber. The short fiber reinforcing rubber layer has short fibers compounded in an amount of 10 to 30 parts by weight with respect to 100 parts by weight of the rubber, and the short fibers are oriented in the tire circumferential direction.

Abstract: A tread surface 2 is divided by inner and outer longitudinal grooves 3a and 3b located on opposite sides of the tire equator into a central land portion 4i, intermediate land portions 4m and shoulder land portions 4o. The intermediate land portion 4i includes an inclined grooves 9 having an angle ? with respect to the circumferential direction of the tire, and the angle is increased from an inner end (mi) away from the inner longitudinal grooves 3a by a small distance La to an outer end (mo) where the intermediate land portion intersects with the outer longitudinal grooves 3b. An angle ?i in the inner end (mi) is 0 to 25°, and an angle ?o in the outer end (mo) is 60 to 80°. A pitch P1 of the inclined grooves 9 in the circumferential direction is greater than a pitch P2 of lug grooves 5 provided in the shoulder land portion 4o in the circumferential direction.

Abstract: A pneumatic tire including a longitudinal main groove formed concavely on a tread surface thereof in a radial direction thereof by extending the longitudinal main groove linearly in a circumferential direction thereof; and narrow grooves formed concavely on at least an outer side surface of both side surfaces of the longitudinal main groove opposed to each other in a widthwise direction of the pneumatic tire by spacing the narrow grooves at certain intervals in a circumferential direction of the pneumatic tire. Each of the narrow grooves is so configured that a longer side of each of the narrow grooves extends in the radial direction of the pneumatic tire and that a shorter side of each of the narrow grooves extends in the circumferential direction of the pneumatic tire. A sectional configuration of a position having a maximum sectional area in each of the narrow grooves is circular arc-shaped.

Abstract: A tire noise reducing system comprises a pneumatic tire with a hollow, a wheel rim on which the tire is mounted so that said hollow forms a closed cavity, and a noise damper disposed in the closed cavity, wherein the noise damper is formed by fixing a strip of a porous material to the tire or wheel rim, the noise damper has a volume in a range of from 0.4 to 20 % of the volume of the cavity, the noise damper has a sectional shape substantially constant in the tire circumferential direction, and the pneumatic tire comprises a tread portion provided with tread grooves defining a tread pattern having a sea ratio of 20 to 35 %.

Abstract: A pneumatic tire comprises a tread portion provided with at least one wide circumferential groove, the wide circumferential groove extending continuously in the tire circumferential direction and having a groove width GW of not less than 5% of the ground contacting width TW, the wide circumferential groove provided in the groove bottom with a groove bottom rib, the groove bottom rib extending continuously along the overall length of the wide circumferential groove, the groove bottom rib having a height Hr in a range of from 0.5 to 3.0 mm and a base width Wr in a range of from 10 to 30% of the groove width GW, and the groove bottom rib provided in the top face with a small groove having a depth Dr of less than the height Hr.

Abstract: A pneumatic tire comprises a tread portion provided with at least one longitudinal groove extending in the tire circumferential direction and blocks adjacent to one side of the at least one longitudinal groove, each of the blocks being provided with a cut-slope on a corner between the block's top surface and a lateral face facing the longitudinal groove, the cut-slope inclining towards the bottom of the longitudinal groove, and the axial width of the cut-slope gradually decreasing from a middle point of the cut-slope towards each side thereof in the circumferential direction, whereby the vehicle overturn marginal during high speed running is improved.

Abstract: A bead portion of a tire has a short fiber reinforcing rubber layer extending along a side surface of a bead apex rubber from a bead core to a height position which is lower than an radially outer end of the bead apex rubber. The short fiber reinforcing rubber layer has short fibers compounded at an amount of 10 to 30 parts by weight with respect to 100 parts by weight of the rubber, and the short fibers are oriented in the tire circumferential direction.

Abstract: A tire comprises a sidewall provided with a mark region for displaying at least one mark including at least one of a sold mark and an outline mark, the mark region is provided with serration made up of serration slots and ridges which are drawn up in lines, the mark is formed by discontinuous parts of the serration, wherein the discontinuous parts of the serration are (1) discontinuous parts of serration slots only or (2) discontinuous parts of ridges only or (3) discontinuous parts of serration slots and discontinuous parts of ridges, wherein the discontinuous part of the serration slot is a shallow part formed within the serration slot and having a top face extending across a corresponding part of the mark in substantially parallel with a tire sidewall surface.

Abstract: A pneumatic tire comprises a tread portion provided with at least one wide circumferential groove, the wide circumferential groove extending continuously in the tire circumferential direction and having a groove width GW of not less than 5% of the ground contacting width Tw, the wide circumferential groove provided in the groove bottom with a groove bottom rib, the groove bottom rib extending continuously along the overall length of the wide circumferential groove, the groove bottom rib having a height Hr in a range of from 0.5 to 3.0 mm and a base width wr in a range of from 10 to 30% of the groove width GW, and the groove bottom rib provided in the top face with a small groove having a depth Dr of less than the height Hr.

Abstract: A pneumatic tire comprises a tread portion provided with at least one longitudinal groove extending in the tire circumferential direction and blocks adjacent to one side of the at least one longitudinal groove, each of the blocks being provided with a cut-slope on a corner between the block's top surface and a lateral face facing the longitudinal groove, the cut-slope inclining towards the bottom of the longitudinal groove, and the axial width of the cut-slope gradually decreasing from a middle point of the cut-slope towards each side thereof in the circumferential direction, whereby the vehicle overturn marginal during high speed running is improved.

Abstract: A pneumatic tire comprises a radially innermost belt ply having an axial width of from 0.8 to 1.2 times the tread width, a carcass with turnup portions having a radially outer end at a height of not more than 0.15 times the tire section height H, and a short fiber reinforcing layer having a thickness of from 0.3 to 1.0 mm disposed along the axially outer surface of the carcass in each of a pair of sidewall portions between the axial outer edge of the radially innermost belt ply and the radially outer end of the carcass turnup portion. The short fiber reinforcing layer is a compound of: 100 parts by weight of a base rubber compound containing 40 to 70 parts by weight of butadiene rubber and 60 to 30 parts by weight of natural rubber and/or isoprene rubber; 10 to 30 parts by weight of short fiber; and not more than 30 parts by weight of carbon black whose iodine number is in the range of from 30 to 90 mg/g.

Abstract: Dyeable polypropylene (PP) fibers for clothes having improved processing properties such as spinning properties, knitting or weaving properties, dyeability are provided, which fibers are obtained by having (a) a 5-20C alkyl phosphate salt or (b) a mixture thereof with an adduct of ethylene oxide to a 6-20C fatty acid in a proportion of the adduct of 1-90% by weight, attached onto dyeable PP fibers obtained by blending a copolymer of an aminoalkyl acrylate with ethylene with a PP and carrying out melt-spinning using the blend as at least one component of the resulting dyeable PP fibers, the amount of (a) or (b) attached onto the fibers in terms of % by weight of the fibers being adjusted so as to satisfy the following expression: ##EQU1## wherein d represents the denier of single fiber.

Abstract: A granular pesticide containing a surfactant as a synergist can be prepared by countercurrent spray drying under specified conditions. The obtained granular pesticide exhibits excellent fluidity and storage stability and is excellent in wettability and disintegratability.