公开(公告)号：JPH07120373A

公开(公告)日：1995-05-12

申请号：JP26909993

申请日：1993-10-27

Applicant: BRIDGESTONE CORP

Inventor： IWATA TOSHIRO ,  YANO MASASHI

IPC: G01N11/14

Abstract: PURPOSE:To obtain a fine evaluation measure which can estimate the workability of unvalcanized rubber by a method wherein the countraction torque of the unvulcanized rubber is stored as digital data at every prescribed sampling time, the stored data is analyzed and the characteristic value of the Mooney voscosity is found. CONSTITUTION:For example, a correlationship between the quality of the dispersion state of a filler such as carbon black or the like and the characteristic value of the Mooney voscosity added from a characteristic torque value is analyzed. That is to say, the relationship of a Mooney-viscosity change value DELTAMG in elapsed times DELTAtGX, DELTAtG until the time tG when the maximum Mooney viscosity appears next since the time tmin when the maximum Mooney viscosity first appeared, is found. Especially, regarding the same mixture of right rubber which contains a filler much, Mooney-viscosity curves of three kinds of unvalcanized rubber at G>H>J are compared with from the rubber in which a dispersion state is better. Then, it is clarified that, the larger values DELTAMG, DELTAtG of the unvulcanized rubber are as in the curve J, the worse the dispersion state is. Consequently, the values DELTAMG, DELTAtG are effective as the surface measure of the filler, and they can be used for quality control or the like.

公开(公告)号：JPH0732374A

公开(公告)日：1995-02-03

申请号：JP17706693

申请日：1993-07-16

Applicant: BRIDGESTONE CORP

Inventor： ITO MICHIO ,  IWATA TOSHIRO ,  KONO HIROSHI ,  HIRUKAWA TETSUYA

IPC: B29C35/02 ,  B29C35/16 ,  B29K21/00 ,  B29K105/24 ,  B29L30/00

Abstract: PURPOSE:To set at least either one vulcanization degree of a fastest part and a slowest part of a material to be vulcanized to a vulcanization degree of a predetermined range by controlling a post-vulcanization degree of the material to be vulcanized such as a tire to a predetermined vulcanization degree. CONSTITUTION:Vulcanizing conditions of a post-vulcanization are decided in response to those of vulcanization until post-vulcanization is conducted. A vulcanization controller controls a vulcanizing machine based on the vulcanizing conditions of the vulcanization to conduct the vulcanization. A tire 50 vulcanized to a predetermined vulcanization degree by the vulcanization is contained in a box 40 of a vulcanization controller 10b. A temperature controller 64 calculates the post-vulcanization based on the vulcanization degree input from the controller at the time of finishing the vulcanization and a target vulcanization degree, and estimates a temperature of a fastest part. The controller 64 so control a cooler/heater 56 that the vulcanization degree from start to end of the vulcanization of the fastest part becomes the target degree based on the post-vulcanization degree and the estimated temperature of the fastest part. This control is repeated at each predetermined time up to a cycle time.

公开(公告)号：JPH06155549A

公开(公告)日：1994-06-03

申请号：JP32899592

申请日：1992-11-16

Applicant: BRIDGESTONE CORP

Inventor： IWATA TOSHIRO ,  NAGATA IWAMI ,  HATAKEYAMA AKIRA

IPC: B29C47/60 ,  B29C48/305 ,  B29C47/14

Abstract: PURPOSE:To prevent the adhesion of a material to the leading end part of a screw and to smoothly and perfectly emit and extrude the material by providing a spiral groove to the leading end part of a screw shaft in the direction reverse to the twist direction of a flight. CONSTITUTION:For example, a recessed part 19 having a circular arc-shaped cross section revolving in the direction reverse to the revolving direction of a flight 15 is spirally formed to the leading end 14F of the shaft of a screw centering around the axis 14C of the screw 13. In this case, the area around the axis of the leading end part of the shaft becomes the direction reverse to the flight 15 and also becomes large. Therefore, a spiral groove is cut in the leading end part of the shaft of the screw for an extruder in the direction reverse to the twist direction of the flight and the adhesion of a material to the leading end part of the screw can be prevented by applying the scattering force of the material closely bonded or left on the leading end part of the screw by the spiral groove. Therefore, labor becomes unnecessary in material removing work and productivity can be enhanced.

公开(公告)号：JPH01113211A

公开(公告)日：1989-05-01

申请号：JP27028287

申请日：1987-10-28

Applicant: BRIDGESTONE CORP

Inventor： HISATOMI HIDEO ,  IWATA TOSHIRO ,  OZOEGAWA SHUNEI ,  ICHIKAWA SEIZO ,  MITARAI KUNINORI

IPC: B29C35/02 ,  B29C33/02 ,  B29K21/00 ,  B29K105/24 ,  B29L30/00

Abstract: PURPOSE:To measure accurately the internal temperature of a tire as well as to control exactly a tire vulcanization, by estimating said temperature from the temperature measured in the boundary between a mold unit and the tire and that measured in the center post assembly of a bladder unit. CONSTITUTION:A first temperature at least at one point in or near the boundary between a mold unit 7 and the tire is measured by means of first temperature sensors 4a-4c, during a tire vulcanization. A second temperature at the center bladder unit 8 is measured by means of second temperature sensors 5a during the tire vulcanization. The internal temperature distribution is calculated from the first and second temperatures and the distribution of degree of vulcanization on the inside of the tire is estimated. From said distribution, the minimum degree of vulcanization is detected, and according to it the timing to stop the heat supply form a vulcanizer is determined. In this way, the internal temperature of the tire can be accurately determined. Thus, it is possible to estimate very accurately the vulcanizing state in the tire and vulcanize the tire in the best condition.

公开(公告)号：JPS6463401A

公开(公告)日：1989-03-09

申请号：JP22069787

申请日：1987-09-03

Applicant: BRIDGESTONE CORP

Inventor： IWAFUNE SEIICHIRO ,  YAMAGUCHI KOJIRO ,  TAKIGUCHI EIJI ,  IWATA TOSHIRO

IPC: B29D30/52 ,  B60C11/00 ,  B60C11/01 ,  B60C13/00

Abstract: PURPOSE:To enhance performance under ice and snow and separation resistance in the title tire by arranging on outside of the tread, an outer layer portion formed with a foaming rubber having a specified glass transition point and a predetermined foaming ratio and average bubble diameter in such a way as to have a preset volume rate with respect to the entire volume of the tread. CONSTITUTION:The outer layer portion 3A of a tread 3 is formed with a foaming rubber 11 having volume of 10% or more of the entire tread and including a rubber component with glass transition point of -60 deg.C or less. The foaming rubber 11 includes a closed bubble 13 with a foaming ratio Vs of 5-50% and an average bubble diameter of 5-150mum, and as well it contains 20 or more closed bubbles with a bubble diameter of 30-200mum per a unit area 1mm . An inner layer portion 3B is formed inside the outer layer portion 3A, and thereat, the inner and outer layer portions 3B and 3A are fitted in contact with each other at a first junction A close to a shoulder 4, and as well the inner layer portion 3B and a side wall 8 are covered with a reinforcing layer 10 at a second junction B. This constitution enables performance under ice and snow and separation resistance to be enhanced.

公开(公告)号：JPS63209817A

公开(公告)日：1988-08-31

申请号：JP4349587

申请日：1987-02-25

Applicant: BRIDGESTONE CORP

Inventor： IWATA TOSHIRO ,  HISATOMI HIDEO ,  SUGAWARA TOSHIO

IPC: B29C35/02 ,  B29C33/02 ,  B29C43/02 ,  B29K21/00 ,  B29K105/24 ,  B29L30/00

Abstract: PURPOSE:To determine a minimum vulcanization value in a member regardless of the dispersion of the thickness of the member by arithmetically operating the degrees of vulcanization of each position by temperature history at at least three positions, arithmetically operating the distribution of the degrees of vulcanization, approximating to the second degree or more of a functional formula from each position and the degrees of vulcanization, and computing the minimum vulcanization value. CONSTITUTION:The nose section 5a of a temperature sensor 5 inserted into a shoulder section 8a for a tire 8 has four temperature-sensing sections 5d1-5d4, and the degrees of vulcanization Mt1-Mt4 are arithmetically operated by a control unit 3 from a temperature measured by the temperature-sensing sections 5d1-5d4 for the temperature sensor 5. The distribution of the degrees of vulcanization is arithmetically operated, approximating to a functional formula of the third degree from the position of the nose section 5a of the temperature sensor 5 in the shoulder section 8a in the tire 8 and the degrees of vulcanization Mt1-Mt4, and a minimum vulcanization value Mvt and a position Pt thereof are arithmetically operated. Even when the position of the minimum vulcanization value Mvt is moved in a member, the minimum vulcanization value Mvt is acquired with extremely high precision. When these minimum vulcanization values Mvt(Mvo) having high accuracy exceed Mvs, vulcanization is completed.