JP6566015B2 - Method and system for producing unvulcanized rubber material - Google Patents

Description

  The present invention relates to a method and a system for producing an unvulcanized rubber material, and more specifically, a predetermined kind of compounding agent is mixed with an unvulcanized rubber at an appropriate blending ratio on an unvulcanized rubber material production line. The present invention relates to a method and a system for producing an unvulcanized rubber material that can produce the unvulcanized rubber material with high productivity.

  When manufacturing rubber products such as tires, there is a step of manufacturing an unvulcanized rubber material by kneading unvulcanized rubber and a compounding agent using a mixer (mixer) or a rubber extruder. In this manufacturing process, the compounding agent is added at a blending ratio set for the unvulcanized rubber. If the proportion of the compounding agent actually added is out of the standard range, the quality of the produced unvulcanized rubber material will be affected. As a result, it affects the quality of rubber products manufactured using this unvulcanized rubber material.

  Conventionally, an oxygen flask combustion method and a sodium peroxide melting method are known as methods for inspecting the amount of sulfur contained in, for example, an unvulcanized rubber material. However, these inspection methods are complicated in procedure and preparation, and cannot be inspected on the production line of unvulcanized rubber material, so that it is possible to produce unvulcanized rubber material of a predetermined quality with high productivity. Can not.

  As a method for determining the quality of the unvulcanized rubber material, ultrasonic waves (0.5 MHz to 20 MHz) are transmitted to the extruded unvulcanized rubber material, and the ultrasonic wave intensity transmitted through the unvulcanized rubber material is measured. A method for detecting the amount of attenuation has been proposed (see Patent Document 1). In this proposed method, it is possible to grasp the presence or absence of contaminants and the relative change in the content of unvulcanized rubber material based on the attenuation of ultrasonic intensity. It is not judged whether or not the blending ratio of the compounding agent is appropriate.

  Although the object is not an unvulcanized rubber material, for concrete, a method is known in which the concentration of chloride contained in the concrete, the content, and the like are measured based on the dielectric constant (see, for example, Patent Document 2).

Special table 2014-521948 gazette JP 2006-214941 A

  An object of the present invention is to provide an unvulcanized rubber material that can be produced with high productivity on an unvulcanized rubber material production line by mixing an unvulcanized rubber with a predetermined kind of compounding agent at an appropriate blending ratio. An object of the present invention is to provide a method and a system for producing a vulcanized rubber material.

  In order to achieve the above object, a method for producing an unvulcanized rubber material according to the present invention includes a primary rubber material obtained by mixing unvulcanized rubber and a predetermined type of non-vulcanized compounding agent, a predetermined type of vulcanized compounding agent, In the method for producing an unvulcanized rubber material in which the final rubber material is continuously produced by charging the mixture into an extruder, the final rubber material in the final rubber material based on the dielectric constant of the final rubber material extruded from the extruder The blending ratio of the vulcanizing compounding agent is calculated by a final arithmetic unit, and the unmixed component is added to the extruder so that the calculated blending ratio is within a preset vulcanization compounding standard range. The ratio of the vulcanizing compounding agent to the vulcanized rubber is adjusted.

  The system for producing an unvulcanized rubber material according to the present invention comprises a primary rubber material obtained by mixing an unvulcanized rubber and a predetermined type of non-vulcanized compounding agent, and a predetermined type of vulcanized compounding agent. An extruder for extruding a rubber material, a vulcanizing compound supply unit for introducing the vulcanizing compound into the extruder, a final dielectric constant measuring device for detecting a dielectric constant of the final rubber material, and the final A final arithmetic unit for inputting the dielectric constant detected by the dielectric constant measuring device, and a final control unit for controlling the vulcanizing compound supply unit, the final arithmetic unit based on the dielectric constant The blending ratio of the vulcanizing compounding agent in the final rubber material is calculated, and the final control device performs the calculation based on the comparison between the calculated blending ratio and a preset vulcanizing compound blending reference range. The vulcanizing compound supply part is controlled to The ratio of the vulcanized compounding agent to the unvulcanized rubber to be fed into the extruder is adjusted so that the compounding ratio calculated by the apparatus is within the range of the vulcanized compounding standard range. It is characterized by that.

  According to the present invention, if the dielectric constant of the final rubber material extruded from the extruder is detected, the final computation unit performs arithmetic processing based on the dielectric constant, thereby blending the vulcanized compounding agent of the final rubber material. By calculating the ratio, the suitability of the blending ratio can be determined simply and quickly. Therefore, based on the result of this determination, the ratio of the vulcanized compounding agent to the unvulcanized rubber to be fed into the extruder is adjusted, so that the vulcanized compounding standard for the unvulcanized rubber is determined. An unvulcanized rubber material mixed at an appropriate blending ratio within the range can be obtained. In addition, since it is possible to determine the suitability of the blending ratio on the production line for the unvulcanized rubber material, it is possible to produce an unvulcanized rubber material that ensures a predetermined quality with high productivity.

It is explanatory drawing which illustrates the manufacturing system of the unvulcanized rubber material of this invention. It is explanatory drawing which expands and illustrates a part of manufacturing system of FIG. It is a graph which illustrates typically the relationship between each of the compounding ratio of carbon black and the compounding ratio of a masterbatch, and the dielectric constant of an unvulcanized rubber material. It is explanatory drawing which illustrates the content (A time-dependent change of the mixture ratio of a compounding agent) displayed on a monitor. It is explanatory drawing which illustrates another content (dispersion degree of a compounding agent) displayed on a monitor.

  Hereinafter, the manufacturing method and manufacturing system of the unvulcanized rubber material of this invention are demonstrated based on embodiment shown in the figure.

  The unvulcanized rubber material manufacturing system 1 (hereinafter referred to as manufacturing system 1) of the present invention illustrated in FIGS. 1 and 2 includes an extruder 3 for extruding the final rubber material R2, and a vulcanizing system compounded in the extruder 3. A vulcanizing compound supply unit 7b for supplying the agent As, a final dielectric constant measuring device 5, a final arithmetic unit 5a to which a dielectric constant detected by the final dielectric constant measuring device 5 is input, and a vulcanizing compounding agent And a final control device 6 for controlling the supply unit 7b. The final dielectric constant measuring device 5 uses the final rubber material R2 immediately after being extruded by the extruder 3 as an inspection target. The final rubber material R2 is formed by mixing the primary rubber material R1 and a predetermined type of vulcanized compounding agent As, and the primary rubber material R1 is composed of an unvulcanized rubber M and a predetermined type of non-vulcanized compounding agent Ac. It is formed by mixing. The final computing device 5a and the final control device 6 are connected by wire or wirelessly.

  Examples of the non-vulcanizing compounding agent Ac include carbon black and silica. Examples of the vulcanizing compounding agent As include at least one of a vulcanization activator, a vulcanization acceleration aid, and sulfur. A master batch in which a vulcanization activator, a vulcanization accelerator and sulfur are mixed in a specified ratio may be used as the vulcanizing compound As.

  The embodiment of the manufacturing system 1 includes the same equipment as the equipment related to the final rubber material R2 described above with respect to the primary rubber material R1. That is, an extruder 2 for extruding the primary rubber material R1, a non-vulcanizing compound supply part 7a for introducing the non-vulcanizing compound Ac into the extruder 2, a primary dielectric constant measuring device 4, and a primary dielectric constant A primary calculation device 4a to which a dielectric constant detected by the measuring device 4 is input and a primary control device 6 for controlling the non-vulcanizing compound supply unit 7a are provided. The primary dielectric constant measuring device 4 uses the primary rubber material R1 immediately after being extruded by the extruder 2 as an inspection target. The primary arithmetic device 4a and the primary control device 6 are connected by wire or wirelessly.

  In this embodiment, one control device 6 is shared as the primary control device 6 and the final control device 6, but each may be provided separately. In this embodiment, the primary arithmetic unit 4a and the final arithmetic unit 5a are provided separately, but both can be shared as one arithmetic unit. Alternatively, the primary arithmetic device 4a, the final arithmetic device 5a, and the control device 6 may be integrated into, for example, one computer.

  In the present invention, not only the extruder 2 but also various kneading means (for example, a mixer) capable of producing the primary rubber material R1 by mixing the unvulcanized rubber M and a predetermined type of non-vulcanized compounding agent Ac. Can be adopted. In this embodiment, it further has one monitor 8 connected to the control device 6 in a wired or wireless manner. When the primary control device 6 and the final control device 6 are provided separately, the primary monitor 8 and the final monitor 8 may be separately connected to each other.

  The extruder 3 includes a cylinder 3a in which a rotationally driven screw is installed, a material charging port 3b formed on the upper surface of the rear end portion of the cylinder 3a, a hopper 3d installed in the material charging port 3b, And an extrusion port 3c formed at the tip of 3a. A conveying means such as a conveyor extends in front of the extrusion port 3c. A supply port of the vulcanizing compound supply part 7 is installed above the hopper 3d.

  The sheet-like primary rubber material R1 is continuously fed into the cylinder 3a of the extruder 3 from the material charging port 3b through the hopper 3d. Also, a predetermined type of vulcanizing compound additive As is continuously fed from the material charging port 3b through the hopper 3d by the vulcanizing compound blending agent supply section 7b. The vulcanized compounding agent As is set to be charged at a predetermined ratio with respect to 100 parts by weight of the unvulcanized rubber M.

  The introduced primary rubber material R1 and vulcanizing compounding agent As move forward while being mixed and kneaded in the cylinder 3a by a rotating screw. And the last rubber material R2 shape | molded by the sheet form from the extrusion port 3c is extruded continuously, and is manufactured.

  The final dielectric constant measuring device 5 can use devices of various known specifications. An apparatus capable of detecting the dielectric constant in a non-contact manner by irradiating the inspection object (final rubber material R2) with ultrasonic waves is preferable. For example, the final dielectric constant measuring device 5 sequentially detects the dielectric constant of the range in which the final rubber material R2 has passed while passing the extruded final rubber material R2.

  Not only one final dielectric constant measuring instrument 5 but also a plurality may be arranged in parallel in the width direction of the final rubber material R2. Alternatively, the final permittivity measuring device 5 can be configured to be movable in the width direction of the final rubber material R2. By adopting these configurations, it is possible to inspect substantially the entire width of the final rubber material R2. Although the dielectric constant in a specific range in the width direction of the final rubber material R2 may be detected, it is preferable to detect the dielectric constant over the entire width and length of the final rubber material R2.

  As illustrated in FIG. 3, correlation data between a blending ratio of a predetermined type of vulcanizing compounding agent As in the final rubber material R2 and a dielectric constant of the final rubber material R2 is input to the final arithmetic unit 5a. Specifically, as the blending ratio of the master batch used as the vulcanizing compounding agent As increases, the dielectric constant of the final rubber material R2 tends to decrease. The final arithmetic unit 5a calculates the blending ratio D2 of the vulcanizing compound compounding agent As in the final rubber material R2 based on the correlation data and the sequentially inputted dielectric constant.

  In this embodiment, correlation data between the blending ratio of the predetermined type of non-vulcanizing compounding agent Ac in the primary rubber material R1 and the dielectric constant of the primary rubber material R1 is input to the primary arithmetic unit 4a. Specifically, the dielectric constant of the primary rubber material R1 tends to increase as the blending ratio of carbon black used as the non-vulcanizing compounding agent Ac increases. Depending on the type of compounding agent A (Ac, As), the correlation between the compounding ratio and the dielectric constant of unvulcanized rubber material R mixed with compounding agent A (whether the dielectric constant increases proportionally or decreases) And the degree to which the dielectric constant changes), the correlation data is acquired in advance for each compounding agent A to be used and input to the primary arithmetic unit 4a or the final arithmetic unit 5a.

  The final arithmetic unit 5a further receives a blended vulcanization system reference range C2 indicating an appropriate blending ratio for each type of the vulcanizing blending agent As. Then, as illustrated in FIG. 4, the final arithmetic unit 5a sequentially compares the calculated blending ratio D2 and the vulcanization system blending reference range C2, and the blending ratio D2 is within the range of the vulcanizing system blending reference range C2. It is judged sequentially whether it is out of range.

  The final control device 6 controls the vulcanization-type compounding agent supply unit 7b based on the comparison between the calculated blending ratio D2 and the vulcanization-type compounding reference range C2. By this control, the blending ratio D2 of the vulcanizing compound compounding agent As calculated by the final arithmetic unit 5a is charged into the extruder 3 so as to be within the preset vulcanizing compound compounding reference range C2. The ratio of the vulcanized compounding agent As to the unvulcanized rubber M is adjusted.

  The monitor 8 sequentially displays the determination result by the final arithmetic unit 5a. The judgment result to be displayed may be a warning simply indicating that the calculated blending ratio D2 is outside the range of the vulcanization-based blending reference range C2, and the change over time of the blending ratio D2 illustrated in FIG. 4 is sequentially displayed. Also good.

  As described above, according to the present invention, the blending ratio of the vulcanized compounding agent As of the final rubber material R2 is calculated by detecting the dielectric constant of the final rubber material R2 and performing arithmetic processing based on the detected dielectric constant. The suitability of this blending ratio can be easily and quickly determined by nondestructive inspection. Therefore, on the basis of this determination result, the vulcanized compounding agent As is added to the unvulcanized rubber M by adjusting the ratio of the vulcanized compounding agent As to the unvulcanized rubber M to be fed into the extruder 3. The final rubber material R2 mixed at an appropriate blending ratio within the range of the vulcanization blending reference range C2 can be obtained. Moreover, since it is possible to determine the suitability of the blending ratio on the production line for the unvulcanized rubber material R, the final rubber material R2 having a predetermined quality can be produced with high productivity.

  By the way, even if the vulcanizing compound As is added to the primary rubber material R1 at a blending ratio that satisfies the vulcanization compounding standard range C2, the vulcanized compound As is still unvulcanized rubber M (primary rubber material R1). If not sufficiently dispersed and mixed, the quality of the manufactured final rubber material R2 is affected. Therefore, it is more preferable to adopt a configuration in which the suitability of the degree of dispersion of the vulcanizing compounding agent As is also judged.

  Therefore, the extruded final rubber material R2 is divided into a number of sections in plan view, and the dielectric constant is detected for each of the sections. Based on the detected variation in the dielectric constant of each section, the final calculation device 5a calculates the degree of dispersion D2 of the vulcanizing compound As in the final rubber material R2.

  The final arithmetic unit 5a is inputted with a vulcanization system dispersion reference range C2 indicating an appropriate dispersion degree D2 for each type of the vulcanization system compounding agent As. Then, the final arithmetic unit 5a sequentially compares the calculated dispersion degree D2 and the vulcanization system dispersion reference range C2, and determines whether the dispersion degree D2 is within or outside the vulcanization system dispersion reference range C2.

  For example, a reference dielectric constant Cd is set, and an absolute value of a deviation between the reference dielectric constant Cd and the dielectric constant of each section is averaged over a predetermined area range (per unit area) to a dispersion degree D2. To do. As the dispersion degree D2 is larger, the vulcanized compounding agent As is not dispersed favorably. Therefore, the preset average allowable range is set to the vulcanization system dispersion reference range C2, and from the vulcanization system dispersion reference range C2. If the degree of dispersion D2 is large, it is determined that the degree of dispersion is poor.

  Even when the dielectric constant is locally too large or too small, it can be said that the vulcanized compounding agent As is not well dispersed. Therefore, the local allowable range set in advance is set to the vulcanization system dispersion reference range C2, and it may be determined that the degree of dispersion is poor when there is a section having a dispersion degree D2 larger than the vulcanization system dispersion reference range C2. it can. At least one of the above-described average allowable range and local allowable range can be adopted as the vulcanization-type dispersion reference range C2, but it is preferable to adopt both.

  The monitor 8 sequentially displays the determination result by the final arithmetic unit 5a. The judgment result to be displayed may be a warning simply indicating that the calculated dispersion degree D2 is outside the vulcanization system dispersion reference range C2, but as shown in FIG. 5, the dielectric constant (or blending ratio D2) It can also be configured to display the distribution of.

  When the display is configured as shown in FIG. 5, each section is divided into a plurality of classes (for example, indices such as ˜85, 85-95,...) By the final arithmetic unit 5 a according to the dielectric constant. Sort. Then, each section is displayed on the monitor 8 in such a manner that the classified classes can be identified. In FIG. 5, the classified classes can be identified by using a pattern such as a blank or a line. However, it is preferable that the classes can be identified by a difference in color or color shade. By displaying in this way, it is possible to easily grasp the suitability of the vulcanization compound As dispersion by simply looking at the monitor 8.

  If there is a part of the final rubber material R2 that is determined to have an inappropriate blending ratio or dispersion, the part may be removed by a cutter such as a cutter installed on the production line. As a result, only the final rubber material R2 that can ensure the predetermined quality is conveyed to the subsequent process of the production line, and the final rubber material R2 that does not satisfy the predetermined quality is excluded from the production line.

  The above-described contents can be similarly applied to the primary rubber material R1. That is, by detecting the dielectric constant of the primary rubber material R1, and calculating based on the detected dielectric constant, the blending ratio D1 of the non-vulcanized compounding agent Ac of the primary rubber material R1 is calculated, and the blending thereof The suitability of the ratio D1 can be quickly determined. Based on this determination result, the non-vulcanized compounding agent Ac is added to the unvulcanized rubber M by adjusting the ratio of the non-vulcanized compounding agent Ac to the unvulcanized rubber M to be introduced into the kneading means 2. The primary rubber material R1 mixed at an appropriate blending ratio within the range of the non-vulcanized blending reference range C1 can be obtained. Moreover, it becomes possible to grasp the suitability of the dispersion of the non-vulcanizing compounding agent Ac in the primary rubber material R1 as in the case of the final rubber material R2.

1 Production system 2 Extruder (kneading means)
2a Cylinder 2b Material input port 2c Extrusion port 2d Hopper 3 Extruder 3a Cylinder 3b Material input port 3c Extrusion port 3d Hopper 4 Primary dielectric constant measuring device 4a Primary calculation device 5 Final dielectric constant measurement device 5a Final calculation device 6 Control device (Primary Control device, final control device)
7a Non-vulcanized compounding agent supply unit 7b Vulcanized compounding agent supply unit 8 Monitor (primary monitor, final monitor)
R Unvulcanized rubber material R1 Primary rubber material R2 Final rubber material M Unvulcanized rubber A Compounding agent Ac Non-vulcanized compounding agent As Vulcanized compounding agent

Claims (8)

A primary rubber material mixed with unvulcanized rubber and a predetermined type of non-vulcanized compounding agent and a predetermined type of vulcanized compounding agent are put into an extruder and mixed to continuously produce the final rubber material. In the method for producing an unvulcanized rubber material,
Based on the dielectric constant of the final rubber material extruded from the extruder, the blending ratio of the vulcanizing compounding agent in the final rubber material is calculated by a final arithmetic unit, and the calculated blending ratio is set in advance. A method for producing an unvulcanized rubber material, comprising adjusting a ratio of the vulcanized compounding agent to the unvulcanized rubber to be fed into the extruder so as to be within a range of a vulcanized compounding reference range.   The final rubber material is divided into a number of sections in plan view, the dielectric constant is detected for each of the sections, and the final arithmetic unit determines the dielectric constant of each section detected based on the magnitude of variation in the dielectric constant. Calculate the degree of dispersion of the vulcanizing compounding agent in the final rubber material, and determine whether the calculated degree of dispersion of the vulcanizing compounding compound is within or outside the preset vulcanization system dispersion reference range. The method for producing an unvulcanized rubber material according to claim 1.   Each of the sections is divided into a plurality of classes by the final arithmetic unit according to the dielectric constant of each of the sections, and each of the sections is displayed on the final monitor so that the classified classes can be identified. The method for producing an unvulcanized rubber material according to claim 2. The unvulcanized rubber and the non-vulcanized compounding agent are put into a kneading means different from the extruder and mixed to continuously produce the primary rubber material, and the dielectric constant of the primary rubber material Based on the non-vulcanizing compounding standard range in which the blending ratio of the non-vulcanizing compounding agent in the primary rubber material is calculated by a primary arithmetic unit based on the calculated non-vulcanizing compounding proportion to be in the range of unvulcanized rubber material according to claim 1, adjusting the proportion of the non-vulcanization compounding agents for the unvulcanized rubber to be introduced to the mixing means Manufacturing method. An extruder that extrudes the final rubber material by mixing a primary rubber material mixed with unvulcanized rubber and a predetermined type of non-vulcanized compounding agent and a predetermined type of vulcanized compounding agent, The vulcanizing compound supply unit for supplying the vulcanizing compounding agent, the final dielectric constant measuring device for detecting the dielectric constant of the final rubber material, and the dielectric constant detected by the final dielectric constant measuring device are input. A final calculation device, and a final control device for controlling the vulcanizing compound supply unit,
Based on the dielectric constant, the final arithmetic unit calculates the blending ratio of the vulcanizing compounding agent in the final rubber material, and the calculated blending ratio and a preset vulcanizing compound blending reference range Based on the comparison of the vulcanization system compounding agent supply unit is controlled by the final control device, so that the blending ratio calculated by the final arithmetic unit is within the range of the vulcanization system compounding reference range, A system for producing an unvulcanized rubber material, wherein a ratio of the vulcanized compounding agent to the unvulcanized rubber charged into the extruder is adjusted.   The dielectric constant is detected for each of a plurality of sections divided in plan view of the final rubber material, and based on the detected magnitude of the variation in the dielectric constant of each section, the final arithmetic unit performs the final calculation. The degree of dispersion of the vulcanizing compounding agent in the rubber material is calculated, and it is determined whether the calculated degree of dispersion of the vulcanizing compounding compound is within or outside the preset vulcanization system dispersion reference range. The system for producing an unvulcanized rubber material according to claim 5, which is configured as described above.   The final arithmetic unit has a final monitor connected wirelessly or by wire, and each of the sections is divided into a plurality of classes by the final arithmetic unit according to the size of the dielectric constant. The system for producing an unvulcanized rubber material according to claim 6, wherein the classified class is identifiable and displayed on the final monitor. A kneading means for continuously producing the primary rubber material by mixing the unvulcanized rubber and the non-vulcanized compounding agent, and the non-vulcanizing compounding agent in the kneading means separate from the extruder A non-vulcanized compounding agent supply unit that inputs a primary dielectric constant measuring device that detects a dielectric constant of the primary rubber material, and a primary arithmetic device that receives the dielectric constant detected by the primary dielectric constant measuring device And a primary control device for controlling the non-vulcanized compounding agent supply unit,
Based on the dielectric constant of the primary rubber material, the primary arithmetic unit calculates the blending ratio of the non-vulcanized compounding agent in the primary rubber material, and calculates the blending ratio of the non-vulcanized blending compound in advance. The non-vulcanized compounding composition calculated by the primary arithmetic unit when the non-vulcanized compounding agent supply unit is controlled by the primary control device based on the comparison with the set non-vulcanized compounding reference range. Claims wherein the ratio of the non-vulcanized compounding agent to the unvulcanized rubber charged into the kneading means is adjusted so that the compounding ratio of the agent falls within the range of the non-vulcanized compounding reference range. manufacturing system of unvulcanized rubber material according to item 1 or to claim 5-7.

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