摘要:
A golf ball having excellent impact resilience and good flying performance comprises a core and a cover for covering the core, wherein the cover contains an ionomer resin as a main material and the ionomer resin has the first peak at 85.degree. to 95.degree. C. and the second peak at 70.degree. to 80.degree. C. in its crystal melting behavior attended with the measurement by a differential scanning calorimeter. A process for producing the above golf ball is also disclosed.
摘要:
A large-sized (1.68 inches) two piece solid golf ball superior in flight distance, comprising a solid core and a cover having a thickness of 2.10 to 2.30 mm. and a Shore D hardness of not less than 65, the total volume of dimples being from 330 to 365 mm.sup.3.
摘要:
A method and apparatus for producing vinegar by acetic acid fermentation utilizing an automatic alcohol analyzer for measurement of alcohol concentration in a fermenting broth, a feeding apparatus for feeding alcohol solution as raw material to the fermenting broth, and a control computer controllably coupled to the alcohol analyzer and to the feeding apparatus. The alcohol concentration in the fermenting broth is periodically measured by the automatic alcohol analyzer by a direction from the control computer at given intervals over a plurality of cycles of measurement; the control computer calculates a feed rate of alcohol solution as raw material to the fermenting broth so as to control the alcohol concentration in the fermenting broth at a desirable concentration on the basis of a difference between a measured alcohol concentration in the fermenting broth and a desirable alcohol concentration and the alcohol consumption rate calculated during each of the cycles by the control computer; and then the feeding apparatus is operated to control the feed rate of the alcohol solution responsive to a control signal generated by the control computer as a result of the aforementioned calculations, to thereby controllably feed alcohol solution as raw material to the fermenting broth.Alternatively, the control computer calculates a feed rate of alcohol solution as raw material to the fermenting broth so as to control the alcohol concentration in the fermenting broth at a predetermined desirable concentration according to acetic acid concentration on the basis of increasing rate of acetic acid concentration, acetic acid concentration and total concentration in the fermenting broth which are calculated by the control computer every cycle over a number of cycles at given intervals, the acetic acid concentration and total concentration being determined at a set point in an appropriate period during fermentation.
摘要:
A method and apparatus for capping the nozzle of a print head of an ink jet recording device for ejecting ink droplets upon a recording medium which comprises capping means which covers the nozzle of the print head of the ink jet recording device for preventing dust from adhering to the nozzle and for eliminating bubbles from getting into the nozzle to prevent the recording ink in the print head from evaporating in combination with purging means composed essentially of suction tube for purging the nozzle of the print head, and which method comprises installing the capping means at a position outside the area of printing of the recording device, and moving the print head to this position when no recording is performed to cap the nozzle face of the print head.
摘要:
An object of the present invention is to provide a golf ball excellent in flying performance, in particular, to provide a golf ball traveling a great flight distance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.
摘要:
An object of the present invention is to provide a golf ball having a low spin rate on driver shots and excellent in flight distance performance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a salt of a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.
摘要:
An object of the present invention is to provide a golf ball having high resilience. The present invention provides a golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, the organic sulfur compound being derivatives of thiophenols and disulfide with a strong electron withdrawing substituent.
摘要:
A solid golf ball having good controllability and long flight distance which utilizes a solid core and a cover covering the core, wherein the core is formed from a rubber composition comprising a polybutadiene rubber having a cis-1,4-structure content of at least 40% and either an unsaturated carboxylic acid or a metal salt thereof or both, and the cover has a thickness of 1 to 4 mm, a Shore D hardness of 55 to 64 and has 300 to 450 dimples having a diameter of 2 to 5 mm, with the dimples having a dimple area proportion of 62 to 78% and a total dimple volume of 260 to 345 mm.sub.3.
摘要:
The present invention provides a rubber composition having high impact residence, preferred processability and workability which may be used for the manufacture of one-piece solid golf ball, solid core of multi-layered solid golf ball, solid center of thread-wound golf ball, etc. The rubber composition is characterized by that a rubber component is made from a mixture of:(1) 60 to 95 wt % of a polybutadiene containing at least more than 40% of cis-1,4 bond and having a Mooney viscosity [ML.sub.1+4 (100.degree. C.)] of 50 to 70, obtained by using lanthanum rare earth-based catalyst, nickel-based catalyst or cobalt-based catalyst, or a mixture thereof with another polybutadiene obtained by using a catalyst other than the above mentioned one, and(2) 5 to 40 wt % of a polyisoprene containing at least more than 90% of cis-1,4 bond and a Mooney viscosity of 70 to 90.
摘要:
In a golf ball according to the present invention, dimples formed on the surface thereof have the same diameter and are classified into first group dimples and second group dimples, and optionally different kinds of dimples within each group, the dimples of one kind differing in depth from the dimples of another kind within that group, each of the first group dimples having a depth substantially the same which is greater than the depth of each of the second group dimples which is also substantially the same for all the second group dimples. The depth of the first group dimple is from 130% to 280% of that of the second group dimple. Further, the number of the first group dimples is from 20% to 80% of the total number of the dimples.