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公开(公告)号：JPS6211163A
公开(公告)日：1987-01-20
申请号：JP14983085
申请日：1985-07-08
Applicant: BRIDGESTONE CORP
Inventor： IWATA TOSHIRO , MORI HIROSHI , UCHINO KYOKO , KONO HIROSHI
IPC: G01N33/44
Abstract: PURPOSE:To enhance the measuring accuracy of a blow point, by accurately measuring vulcanization temps. at respective parts of a sample with the elapse of time by a plurality of temp. sensors inserted in the sample during valcanization so as to reach predetermined positions. CONSTITUTION:The cavity of a vulcanization mold is packed with unvulcanized rubber to start vulcanization and, at such a stage that the fluidization of rubber was settled, four temp. sensors 27 are allowed to advance to be horizontally inserted so as to reach the required positions of rubber. Next, temps. are measured with the elapse of time by the temp. sensors 27 and a vulcanization degree is continuously calculated from the measured results and a vulcanization time. Subsequently, from a measured vulcanization degree, it is confirmed that the vulcanization distribution of each part of rubber reached a required state to stop the vulcanization. Then, the final measured vulcanization degrees at the temp. measuring points are plotted at every measuring points and these points are connected by one line to estimate the vulcanization degree of each part of the sample in the longitudinal direction.
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公开(公告)号：JPH0780843A
公开(公告)日：1995-03-28
申请号：JP22710793
申请日：1993-09-13
Applicant: BRIDGESTONE CORP
Inventor： IWATA TOSHIRO , ITO MICHIO , HIRUKAWA TETSUYA
IPC: B29C33/02 , B29C35/02 , B29K21/00 , B29K105/24
Abstract: PURPOSE:To carry out the vulcanization without causing irregularity in a vulcanization state and enhanced the productivity or quality by estimating the energy at the time of next vulcanization so that the fluctuation tendency of energy calculated between a plurality of materials to be vulcanized enters into a specific range and controlling next vulcanization on the basis of this estimation. CONSTITUTION:In vulcanization treatment, the update data at the time of initial vulcanization stored in an external memory device as a data base is read, for example, five times and a vulcanization state value is estimated from the read data to judge whether the vulcanization state value is within a specific tolerance range. When the estimated value is within the tolerance range, a tire is vulcanized as it is and, when the value is out of the torelance range, the energy for vulcanizing the tire 48 is determined while the vulcanization state value is held within the torelance range. That is, the energy allowing all of the values of a vulcanization time, a vulcanization degree and the max. temp. to enter the torelance range is operated to determine the energy at the time of the next vulcanization of the tire. The temp. of the heating fluid supplied to a jacket 16 and upper and lower platens 22, 24 is altered by the determined energy to be reflected to the next tire 48.
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公开(公告)号：JPH0740355A
公开(公告)日：1995-02-10
申请号：JP18421793
申请日：1993-07-26
Applicant: BRIDGESTONE CORP
Inventor： ITO MICHIO , IWATA TOSHIRO , HIRUKAWA TETSUYA
IPC: B29C33/04 , B29C35/04 , B29K21/00 , B29K105/24 , B29L30/00
Abstract: PURPOSE:To vulcanize a material to be vulcanized, such as a tire, into an optimum state without the variation of the vulcanized state of the material, such as a tire, in the vulcanized state. CONSTITUTION:Based on initial set conditions including a boundary condition of a tire 48 to be treated, a vulcanization and a time series temperature measurement are conducted (steps 102-112). In the initial set conditions, a thermal conductivity, a heat transfer coefficient, a heat flow rate, and the like as a function of a temperature are taken into consideration. An internal temperature of the tire is estimated using the measured temperature values by an FEN analysis by an analyzing model composed of the tire, a mold, and a bladder, and a latest point is determined by the estimated temperature (steps 114, 116). Next, a vulcanizing degree and a vulcanizing reactivity at the latest point are evaluated (a step 117). A vulcanizing time to a predetermined vulcanizing reactivity value is predicted (a step 118). A vulcanizing machine is feedback controlled till the elapse of the predicted vulcanizing time (steps 120-124).
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公开(公告)号：JPS6390403A
公开(公告)日：1988-04-21
申请号：JP23592286
申请日：1986-10-02
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , IWATA TOSHIRO
IPC: B60C11/00
Abstract: PURPOSE:To improve resistance to ice and snow without impairing abrasion resistance and heat-generation durability by placing a foam rubber layer having closed cells in the thickness direction of a tread, and differentiating its foaming rate in the thickness direction and in the width direction of said tread. CONSTITUTION:A foam rubber layer 11 having closed cells is provided between both shoulders ranging over the whole thickness of a tread 3. In the foam rubber 12 constituting this foam rubber layer 11, the foaming rate Vs is differentiated between the outermost side part 11a and the innermost side part 11b, making the foaming rate Vs on the outermost side part 11a larger by more than 5% in the difference in foaming rate, than the foaming rate Vs on the innermost side part 11b. By this structure, resistance to ice and snow can be improved without impairing abrasion resistance and heat generation durability.
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公开(公告)号：JPS6390402A
公开(公告)日：1988-04-21
申请号：JP23592186
申请日：1986-10-02
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , IWATA TOSHIRO
IPC: B60C11/00
Abstract: PURPOSE:To improve resistance to ice and snow without impairing abrasion resisting performance and heat-generation durability by providing a specific foam rubber layer having a defined rate of volume to the whole volume of a tread on a tread surface side. CONSTITUTION:A foam rubber layer 10 having a volume more than 10% of the whole volume of a tread is formed on the surface part 3a of a tread 3. This foam rubber layer 10 has closed cells having a foaming rate of 5-50% and an average foam diameter of 5-150mum, while containing more than 20 per 1mm unit area of closed cells each having a foam diameter of 30-200mum. Also, its dynamic modulus of elasticity is specified to, 3X10 -13X10 dyn/cm . And, a low temp. softening agent of 2-20pts.wt. is blended with respect to a rubber ingredient of 100pts.wt. By this structure, resistance to ice and snow can be improved without impairing abrasion resistance and heat generation durability.
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Patent Agency Ranking
公开(公告)号：JPH0725952B2
公开(公告)日：1995-03-22
申请号：JP23862186
申请日：1986-10-06
Applicant: BRIDGESTONE CORP
Inventor： IWAFUNE SEIICHIRO , IWATA TOSHIRO
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公开(公告)号：JPH06297460A
公开(公告)日：1994-10-25
申请号：JP8476993
申请日：1993-04-12
Applicant: BRIDGESTONE CORP
Inventor： IWATA TOSHIRO , YOKOYAMA TOMOYASU , HIRUKAWA TETSUYA
IPC: B29C33/02 , B29C35/02 , B29K21/00 , B29K105/24 , B29L30/00
Abstract: PURPOSE:To make it possible to calculate optimum vulcanizing time per tire and consequently eliminate the variation in the quality of tire without developing troubles such as the complication of hardening system and the like when the vulcanization treatment of the tire is carried out under the condition that a plurality of vulcanizing machines are put to work simultaneously. CONSTITUTION:Eight vulcanizing machines 10 are reccurringly put to work by selecting one vulcanizing machine 10 every day. The vulcanizing machine 10A selected on the first day is controlled by a workstation I so as to calculate vulcanizing reaction thermodynamic function by FEM on the basis of set conditions in order to estimate its vulcanizing time. Further, a polynominal, the factors in which are inputted on the basis of the data for obtaining estimated vulcanizing time, is formed and then stored in a data base 60A'. The remaining seven vulcanizing machines 10B-10H are controlled by workstations II and their vulcanizing times are estimated on the basis of data bases 60B'-60H', since the data bases 60B'-60H' are already formed when the vulcanizing machines are selected previously.
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公开(公告)号：JPH06166086A
公开(公告)日：1994-06-14
申请号：JP28778592
申请日：1992-10-26
Applicant: BRIDGESTONE CORP
Inventor： IWATA TOSHIRO , NAGATA IWAMI , HATAKEYAMA AKIRA , SAIKAI KAZUHISA
Abstract: PURPOSE:To constitute the extruding device so that discharge of a material is smooth, the material can be extruded completely, removal operation of the material does not cost much labour and productivity can be improved. CONSTITUTION:The extruding device is constituted so that an extrusion material such as rubber supplied to a hopper of a twin-screw extruding device 10 is gripped into a feed part 13A of two screws 13, fed to a compression part 13B on the tip side by a flight 15 of the feed part 13A, pressure is increased and extruded into a sheetlike state through a roller die from a discharge port 18. Then in the tip part of the shaft 14 of the screw 13, the diameter D1 of the shaft is made larger in a tapered state in the direction of the tip, through the optimum twisted angle theta of the flight 15, an extruding sectional area to be formed by the shaft 14 and flight 15 is increased continuously extending to the rear end of the shaft from the tip of the shaft.
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公开(公告)号：JPS6317010A
公开(公告)日：1988-01-25
申请号：JP16155986
申请日：1986-07-08
Applicant: BRIDGESTONE CORP
Inventor： HISATOMI HIDEO , IWATA TOSHIRO , OKA KIKUO
Abstract: PURPOSE:To make it possible to accurately and surely determined the vulcanizing time for obtaining the optimum quality and performance of a tire with any size without giving any damage to the tire by a method wherein the minimum vulcanizing value in the tire is selected and the vulcanization of the tire is brought to an end when said value exceeds the set target value for bringing the vulcanization of the tire to an end. CONSTITUTION:The position ss having the minimum degree Ms of volcanization is selected by a control unit 3 on the basis of the distribution Mnm of the degree of vulcanization, which is calculated in the direction A of a tiregage represented by, for example, 7 positions x. the minimum vulcanizing value Mv is obtained by the control unit 3 from the values at the position x>=s having the minimum degree Ms of vulcanization and at the positions x, which are one or more respectively on both sides of xs, on the distribution Mnm of the degree of vulcanization at the time a3 after the start of vulcanization. The minimum vulcanizing value MT in a tire 5 is selected by comparing minimum vulcanizing values MVm at the respective positions in the tire 5 in the control unit 3. the set target value Mc, which is inputted in the control unit 3 in advance in order to bring the vulcanization of the tire to an end, is compared with the minimum vulcanizing value MT in the tire. When the minimum vulcanizing value MT exceeds the set target value Mo for vulcanization, a signal C3 to shift the end of vulcanization is outputted.
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公开(公告)号：JPS629917A
公开(公告)日：1987-01-17
申请号：JP14803885
申请日：1985-07-05
Applicant: BRIDGESTONE CORP
Inventor： IWATA TOSHIRO , MORI HIROSHI , UCHINO KYOKO
Abstract: PURPOSE:To enable precise and swift measurement of blow point through a small volume sample, by a method wherein a depth of a cavity to be formed by closing a top and bottom force parts is increased continuously or stepwise toward one end from the other end of the same. CONSTITUTION:A cavity 25 whose cross-sectional form is a isosceles trapezoid facing sideways is formed between both a top and bottom force parts by clamping the said two parts. In case where rubber is pressurized and vulcanized within a cavity wherein a depth is increased continuously from one end to the other end, it is desirable to make a temperature measuring region of the rubber, which is in the course of vulcanization, into the central region, whose length is l, separating from respective end fringes of the rubber more than three times as long as thicknesses h1, h2 at the respective end fringes of the rubber. In case where the temperature measuring region has been set up like this, temperature measurement which in its turn a degree of vulcanization can be performed by a method wherein the amount of heat to be transmitted to the interior of the rubber from a side wall of a vulcanizing mold 3 is not affected almost or at all and measuring accuracy of blow point can be made to improve effectively.
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