JP4780714B2 - Rubber reinforcing cord manufacturing method and manufacturing apparatus - Google Patents

Description

The present invention is an organic fiber cord dip solution adheres a manufacturing method and apparatus reduce variation to Lugo arm reinforcing cord of moisture content by drying so that the water content is within the target range.

  Conventionally, fiber cords made of various fibers have been used in a wide variety of fields as industrial products or raw materials thereof. For example, rubber reinforcing cords made of organic fibers such as PET (polyethylene terephthalate) and nylon are used for pneumatic tires and conveyors. Widely used as a reinforcing material (for example, tire cords) for rubber industrial products such as belts, hoses, and air springs. In general, this rubber reinforcing cord is made by twisting organic fiber yarn with a twisting device to produce the organic fiber cord, and then dipping or dipping necessary for bonding between the fiber material and rubber. Appropriate physical properties and adhesion to rubber are imparted by various treatments such as physical property modification treatment to form a rubber reinforcing cord (dip cord). Thereafter, a rubber product or an intermediate member is manufactured by covering the periphery thereof with rubber (see Patent Document 1).

  A conventional general manufacturing apparatus for such a rubber reinforcing cord includes a supply device for supplying one or more long organic fiber cords by unwinding them from a roll, and the supplied organic fiber cords. An adhesion device for dipping the dip solution by dipping in the dip solution (adhesive solution), a drying device for drying the organic fiber cord to which the dip solution adheres, a heat treatment device for modifying the dried organic fiber cord, and a heat treatment A winding device for winding the organic fiber cord (rubber reinforcing cord) is provided in order along the movement path of the organic fiber cord.

  In this conventional manufacturing apparatus, the supplied organic fiber cord is continuously moved and sequentially passed through each of the above-described apparatuses (processes), and each treatment is applied to each one or a plurality of rubber reinforcing cords simultaneously. Manufacture continuously. Specifically, first, the supplied organic fiber cord is allowed to pass through the dip solution to adhere the dip solution, and then is passed through the drying device to dry the attached dip solution. Next, heat treatment is performed at a higher temperature by passing through a heat treatment apparatus, and the dried dip solution is bonded to the organic fiber cord by heating, and further, a tension is applied to perform heat stretching treatment under predetermined conditions of high temperature and high tension. The physical properties of organic fiber cords are modified, adjusted and standardized by adjusting the molecular arrangement of organic fibers.

  The rubber reinforcing cord (dip cord) manufactured through each of the above treatments has an adhesive layer formed on the surface, whereby the organic fiber cord and the rubber to be coated are firmly bonded, and the cord physical properties are optimized. The As a result, for example, in the case of a tire cord, the adhesive strength to rubber can be increased, the durability of the tire can be improved, and the uniformity of the cord physical properties can be increased to stabilize the tire properties.

  Here, the dip solution to be attached to the organic fiber cord is, for example, a resorcin / formaldehyde condensate (RF) resin solution and an aqueous rubber / latex (L) solution, which are optimally blended in order to ensure adhesion with rubber. Is a liquid adhesive (adhesive liquid) containing a large amount of water as a medium for enhancing the adhesive strength with rubber. Therefore, in the drying process of the organic fiber cord, it is necessary to evaporate and dry the water in the dip liquid adhered by heating to form a resin film on the surface of the organic fiber cord in order to ensure the adhesiveness of the cord. .

  By the way, in the conventional drying apparatus, it is common to circulate hot air in the apparatus and blow it on the organic fiber cord, and conduct heat gradually from the surface toward the inside to evaporate and dry the moisture. . Therefore, the thermal efficiency and drying efficiency are low, and the surface portion of the previously dried dip liquid is destroyed as the moisture in the interior evaporates, or blisters (dip scale) are generated due to oxidation by prolonged heating, etc. Workability and the like may deteriorate due to adhesion to the organic fiber cord or the apparatus. In addition, organic fiber cords tend to deteriorate and become less durable and strong when placed under high temperature and high moisture (high humidity) for a long time. In the drying apparatus, there is a possibility that the organic fiber cord is deteriorated and the strength is reduced to cause damage.

  Therefore, in recent years, the organic fiber cord is dried using a microwave to deal with such a problem. In this drying method, the organic fiber cord to which the dip solution is attached is irradiated with microwaves, and the water molecules in the dip solution and the organic fiber cord are vibrated to generate heat from the inside. Evaporate and dry the moisture. Since this microwave has a very high dielectric constant with respect to water, water can be selectively heated and quickly evaporated as compared with other components of the dip liquid and organic fiber cords. At the same time, heat can be generated not only from the surface of the dip solution but also from the inside to heat the entire dip solution at a high speed, so that the organic fiber cord to which the dip solution has adhered can be dried in a short time. As a result, the drying process time can be shortened to improve the efficiency, and the above-described wet heat deterioration and scale generation of the organic fiber cord can be suppressed.

  However, in this drying method, the organic fiber cord is overdried by microwave drying, and the moisture content of the organic fiber cord (the moisture content, which is the mass ratio of the remaining moisture) becomes less than a predetermined value and approaches 0%. In some cases, the organic fiber cord itself generates heat by the microwave and is heated, and the temperature thereof rises above the assumed temperature. In such a case, there is a high risk that the organic fiber cord being melted will be melted, resulting in fusing, reduced strength, etc., so in this microwave drying method, the moisture content of the organic fiber cord becomes too low. Therefore, it is necessary to control the target range so that drying is not insufficient.

  Therefore, in the past, the moisture content of the manufactured product (rubber reinforcement cord) was measured after confirmation with a moisture meter, and the manufacturing conditions were modified based on the measurement results to bring the moisture content of the organic fiber cord within the target range. It is adjusted so that That is, in the prior art, first, the drying device is operated under preset manufacturing conditions to dry the organic fiber cord, and all the above-described processes are performed, and the organic fiber cord is wound by the winding device. Next, after finishing the processing and winding of all the organic fiber cords and stopping the entire apparatus, a sample is extracted from the wound organic fiber cords, the moisture content is measured, and the organic fiber cords in the production conditions are measured. Know the moisture content. Next, the manufacturing conditions are corrected based on the information, and the apparatus is operated under the corrected conditions to manufacture the next rubber reinforcing cord. Such an operation is performed every time or periodically, and the moisture content of the organic fiber cord is controlled to be within a target range.

  Therefore, in this conventional moisture content control method, the quality and quality of the organic fiber cord being processed cannot be checked in real time, and the manufacturing conditions cannot be changed during the processing. There is a problem that it is not possible to flexibly cope with fluctuations in the moisture content of the fiber cord. As a result, the moisture content of the organic fiber cord may vary greatly in the longitudinal direction and the width direction, and it is difficult to suppress variations in the quality of the organic fiber cord after processing. In addition, the moisture content of the organic fiber cord may be out of the target range, the moisture content may be below the target range, approaching 0%, and the quality of the organic fiber cord may be deteriorated due to fusing or strength reduction. is there.

Japanese Patent Laid-Open No. 11-323691

The present invention has been made in view of the conventional problems, and its object is flexibly correspond to variation of the moisture content of the organic fiber cord in the process, reduce variations in the moisture content of the organic fiber cord The purpose is to stabilize the quality by preventing the occurrence of fusing.

The invention of claim 1, the organic fiber cord is moved in succession to a method for producing a rubber-reinforcing cord for manufacturing a rubber-reinforcing cord, adhering a dip solution to the organic fiber cord, the a step of drying by microwave irradiation to the organic fiber cord dip solution is attached, a step of measuring the moisture content of the organic fiber cord obtained by the drying, a predetermined and measured values of the moisture content of water It includes a step of comparing the fraction of the target value, based on the comparison result, and a step of changing the output of the microwave the moisture regain of the fabric to the target range of the organic fiber cord obtained by the drying The above-mentioned steps are executed continuously .
The invention of claim 2 is the method for manufacturing a rubber-reinforcing cord according to claim 1, characterized in Rukoto to have a heat treatment step of modifying the organic fiber cord.
According to a third aspect of the present invention, in the method for manufacturing a rubber reinforcing cord according to the first or second aspect, the organic fiber cord is a single-wire organic fiber cord or a braided weave having no one or a plurality of wefts. It is characterized by being an organic fiber cord.
A fourth aspect of the present invention, an apparatus for producing a rubber-reinforcing cord for manufacturing a rubber-reinforcing cord is moved continuously organic fiber cord, and attachment device for attaching a dip solution to the organic fiber cord, the A drying device that irradiates the organic fiber cord to which the dip solution is adhered with microwaves to dry, and a measurement that measures the moisture content of the dried organic fiber cord that is disposed along the movement path of the organic fiber cord. Means for comparing the measured value of the moisture content with a predetermined target value of the moisture content, and based on the comparison result, the moisture content of the dried organic fiber cord is within the target range. And a control device for changing and controlling the microwave output of the device .
According to a fifth aspect of the present invention, in the rubber reinforcing cord manufacturing apparatus according to the fourth aspect, the apparatus further comprises a heat treatment apparatus for modifying the organic fiber cord .
According to a sixth aspect of the present invention, in the rubber reinforcing cord manufacturing apparatus according to the fourth or fifth aspect, the organic fiber cord is a single-wire organic fiber cord or a braided weave having no one or a plurality of wefts. It is characterized by being an organic fiber cord .

(Function)
In the present invention, the organic fiber cord to which the dip solution is adhered is irradiated with microwaves and dried in a short time. Further, the moisture content of the dried organic fiber cord is measured, and the measured value is compared with a predetermined target value. Based on the comparison result, the microwave output is increased or decreased according to the difference. The moisture content of the organic fiber cord is controlled by changing the output of the microwave and performing feedback control to an optimum condition so that the moisture content of the organic fiber cord falls within the target range.

According to the present invention, flexibility in response to variations in the moisture content of the organic fiber cord in the process, can reduce variations in the moisture content of the organic fiber cord, preventing to stabilize the quality occurrence of fusing such Can be planned.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a configuration of a main part in the rubber reinforcing cord manufacturing apparatus of the present embodiment.
The manufacturing apparatus 1 continuously includes a single-line organic fiber cord 50 that does not have one or a plurality of (for example, 2 to 250) wefts, or an organic fiber cord (fabric) 50 that is interwoven with wefts. The rubber reinforcement cord is manufactured by performing various treatments at the same time (arrows in the figure) and reforming. The operation starts and stops according to the operation start command and the operation end command from a production management system (not shown). End (stop).

  As shown in the drawing, the manufacturing apparatus 1 of the present embodiment includes a pull roll 2 (only one place is shown in the figure) composed of a plurality of rolls 2R arranged at a plurality of places along the movement path of the organic fiber cord 50, and an organic fiber. Free rolls 3, 4 and 5 for guiding the movement of the cord 50 are provided. In addition, the organic fiber cord 50 is attached to the organic fiber cord 50, which is disposed in order from the upstream side to the downstream side in the moving direction of the organic fiber cord 50. A squeezing device 20 for squeezing the attached dip solution 12 and a moisture content control device 30 for the organic fiber cord 50 to which the dip solution 12 is attached are provided.

  In addition, the manufacturing apparatus 1 includes an organic fiber cord 50 supply device (not shown) disposed upstream of the pull roll 2 in the movement direction of the organic fiber cord 50 and an organic fiber with respect to the moisture content control device 30. A heat treatment device (not shown) disposed on the downstream side of the cord 50 in the moving direction to modify the organic fiber cord 50, and a winding device (not shown) for winding the rubber reinforcing cord manufactured through each treatment. ) Etc., and a known configuration of a general rubber reinforcing cord manufacturing apparatus.

  The pull roll 2 is composed of a plurality of rolls 2R that can be rotated around an axis line in which organic fiber cords 50 are alternately wound in a zigzag manner in the vertical direction, and drive means (not shown) for the plurality of rolls 2R at a predetermined position. The organic fiber cord 50 is moved in the longitudinal direction while applying a predetermined tension. Each of the free rolls 3, 4, 5 is supported by a support member (not shown) so as to be rotatable around an axis, and guides the movement of the organic fiber cord 50 over the outer peripheral surface. Moreover, the free roll 3 is arrange | positioned between the pull roll 2 and the adhesion apparatus 10, respectively, the free roll 4 is arrange | positioned in the dip liquid 12 of the adhesion apparatus 10, and the free roll 5 is the squeezing apparatus 20 and a water | moisture content, respectively. It is arranged between the rate control device 30.

  The adhering apparatus 10 has a dip liquid tank 11 for storing the dip liquid 12, and adheres the dip liquid 12 to the organic fiber cord 50 guided into the dip liquid tank 11 by the free roll 4. At this time, the amount of the dip liquid 12 is adjusted so that the free roll 4 is always located in the dip liquid 12 of the dip liquid tank 11, and the dip liquid 12 is securely attached to the organic fiber cord 50 and moved. It sends out to the squeezing device 20 on the downstream side in the direction.

  The squeezing device 20 is for squeezing the excess dip liquid 12 adhering to the organic fiber cord 50 and adjusting the adhering amount, and is arranged linearly in order from the upstream side in the moving direction of the organic fiber cord 50. And three squeezing rolls 21, 22, and 23. Each of the squeezing rolls 21, 22, and 23 is supported by a support member (not shown) so as to be rotatable around an axis, and the organic fiber cord 50 is moved along the outer peripheral surface of the upstream squeezing roll 21. After passing between the outer peripheral surface of the central squeeze roll 22, it is moved along the outer peripheral surface of the central squeeze roll 22 to pass between the outer peripheral surface of the downstream squeeze roll 23. Further, the squeezing rolls 21 and 23 at both ends can be displaced in a direction approaching and separating from the central squeezing roll 22 (in this case, the vertical direction indicated by arrows in the figure) by driving means such as a piston / cylinder mechanism. The gap between the outer peripheral surfaces of the squeezing rolls 21, 22, and 23 is changed according to the position.

  The squeezing device 20 squeezes the excess dip liquid 12 by squeezing the organic fiber cord 50 to which the dip liquid 12 is adhered between the respective squeezing rolls 21, 22, 23. At this time, the squeezing rolls 21 at both ends are squeezed. , 23 to change and adjust the gap between the outer peripheral surfaces of the rolls. As a result, the pressure applied to the organic fiber cord 50 passing between the squeezing rolls 21, 22, and 23 is changed to change the squeezing amount of the dip liquid 12 attached to the organic fiber cord 50. The squeezing device 20 controls the displacement amount of the squeezing rolls 21 and 23 to optimize the squeezing amount of the dip liquid 12 from the organic fiber cord 50, and squeezes the excess dip liquid 12 from the organic fiber cord 50. The adhesion amount is adjusted to an appropriate amount, and sent to the moisture content control device 30 on the downstream side via the free roll 5.

  The moisture control device 30 for the organic fiber cord 50 is for drying the organic fiber cord 50 to which the dip liquid 12 is adhered and for controlling the moisture content of the organic fiber cord 50 after drying. The moisture content control device 30 of the present embodiment includes a drying device 31 arranged downstream of the free roll 5 in the moving direction of the organic fiber cord 50, and a downstream side of the heat treatment device in the next step (here, drying). A non-contact moisture meter 32 disposed in the vicinity of the outlet of the device 31, and a control device 40 connected to each part of the moisture content control device 30 including them.

  The drying device 31 has a pair of microwave irradiation devices 31B and 31C arranged to face each other with the organic fiber cord 50 interposed therebetween, and irradiates the organic fiber cord 50 to which the dip liquid 12 is attached with microwaves. dry. That is, the drying device 31 irradiates the microwaves 50 having a predetermined output generated by the microwave irradiation devices 31B and 31C from both sides toward the organic fiber cord 50 moving between them. By the microwaves, the attached dip liquid 12 and the water molecules in the organic fiber cord 50 are selectively vibrated to generate heat from the inside, and the heat is evaporated by the heat to evaporate the moisture, thereby drying the organic fiber cord 50. . Moreover, in this drying apparatus 31, the output of each microwave irradiation apparatus 31B and 31C can be changed, and the evaporation of water | moisture content is changed by changing the output of a microwave and changing the emitted-heat amount of the organic fiber cord 50. The amount of drying can be changed by changing the amount, that is, the moisture content.

  The non-contact moisture meter 32 has the non-contact type sensor unit disposed opposite to the organic fiber cord 50 at a predetermined interval, and the moisture content of the organic fiber cord 50 dried by the drying device 31 is non- It is a measuring means for measuring by contact. This non-contact moisture meter 32 uses the property that the dielectric constant changes according to the amount of moisture contained in the substance, and in-line determines the moisture content for each unit length of the organic fiber cord 50 to which the dip liquid 12 adheres in a non-contact manner. The measurement is continuously performed, and the measurement data is output to the control device 40.

  The control device 40 controls the entire moisture content control device 30, and includes a central processing unit (CPU) 41, an input / output unit 42 connected to the CPU 41, and a memory 43. The control device 40 (CPU 41) is connected to the microwave irradiation devices 31B and 31C of the drying device 31 and the non-contact moisture meter 32 via the input / output unit 42, and the device 30 via the input / output unit 42. Various data are transmitted / received to / from each unit, and their operations are controlled.

  The CPU 41 performs various data processing, analysis, calculation, and the like necessary for the control of the moisture content control device 30. For example, from the measurement data of the non-contact moisture meter 32 input via the input / output unit 42, the organic fiber cord 50. Calculate moisture content. In addition, based on the calculation result (measured value of moisture content), various data stored in the memory 43, and the like, the microwave irradiation devices 31B and 31C such that the moisture content of the dried organic fiber cord 50 falls within the target range. Calculate the output to determine the drying conditions. Further, the determined condition and condition change instruction are output to the microwave irradiation devices 31B and 31C via the input / output unit 42, and the output of the microwave is changed and controlled, for example, the drying of the organic fiber cord 50 and the moisture content. The control operation is executed with feedback control online.

In the memory 43, in addition to various programs necessary for the control of the moisture content control device 30, various data used for the control, such as a target moisture content 44, a moisture content conversion table 45, a target moisture content data value 46, A standard condition table 47 and an output control table 48 are stored.
The target moisture content 44 defines an appropriate moisture content that can prevent the organic fiber cord 50 from being melted, and includes data indicating a target value and a target range (upper and lower limit values of the target value) of the moisture content. Here, the median value of the target range is set as the target value (hereinafter the same).

  The moisture content conversion table 45 is a correspondence relationship between the measured value of the moisture content of the organic fiber cord 50 by the non-contact moisture meter 32 (indicated value of the moisture meter 32: hereinafter referred to as the moisture content data value) and the measured value of the moisture content. And is used for mutual conversion between the moisture content data value and the moisture content. The table 45 includes a moisture content data value of the non-contact moisture meter 32 for the organic fiber cord 50 and an actual measurement value of the moisture content of the organic fiber cord 50 (for example, calculated from a mass difference before and after drying at 125 ° C. for 30 minutes). Are set in advance by sampling a plurality of values to obtain the correspondence between the two values.

  The target moisture content data value 46 is obtained by converting the target value and the target range of the target moisture content 44 described above by the moisture content conversion table 45. The moisture content data value of the organic fiber cord 50 (instruction of the non-contact moisture meter 32) Value) target value and target range.

The standard condition table 47 is a standard drying condition (microwave standard) for setting the moisture content data value of the organic fiber cord 50 to be dried by the drying device 31 (microwave irradiation devices 31B and 31C) to the vicinity of the target value W. It is a table (refer FIG. 2A) which shows the output T).
The output control table 48 is a table showing the relationship between the difference value ΔW between the moisture content data value of the organic fiber cord 50 measured by the non-contact moisture meter 32 and the target value W and the increase / decrease amount ΔT of the microwave output ( 2B).

  In the present embodiment, the tables 47 and 48 are set in advance based on the results of measuring the moisture content by irradiating the microwaves with a plurality of outputs to dry the organic fiber cord 50 and measuring each moisture content in advance. create. Further, this control device 40 is connected to each part of the rubber reinforcing cord manufacturing device 1 (the pull roll 2, the dip liquid 12 adhesion device 10, the squeezing device 20, etc.) other than the moisture content control device 30, and Data is transmitted / received between them, and each process for manufacturing is executed by operating each part in conjunction, such as movement of the organic fiber cord 50, adhesion of the dip liquid, and adjustment of the adhesion amount.

Next, the operation of the rubber reinforcing cord manufacturing apparatus 1 having the above configuration will be described.
FIG. 3 is a flowchart showing the operation of the moisture control device 30 among the operations of the manufacturing apparatus 1.

  First, when an operation start command is input to the manufacturing apparatus 1 from a production management system (not shown), the control apparatus 40 displaces the squeeze rolls 21 and 23 on both ends of the squeezing apparatus 20 (see FIG. 1) to move each roll. The gap between the outer peripheral surfaces is changed and adjusted so that the amount of the dip liquid 12 attached to the organic fiber cord 50 in the vicinity of the inlet of the drying device 31 is appropriate. Further, the control means 40 refers to the standard condition table 47 (FIG. 2A) in the memory 43, and a microwave standard output for controlling the moisture content data value of the dried organic fiber cord 50 near the target value W. T is read, and the outputs of the microwave irradiation devices 31B and 31C of the drying device 31 are set according to the read value. The control means 40 sets each part of the manufacturing apparatus 1 including the above settings, drives a plurality of pull rolls including the pull roll 2, and starts the movement of the organic fiber cord 50 and the operation of the manufacturing apparatus 1 (S101). .

  Thereby, first, the supplied organic fiber cord 50 is immersed in the dip liquid 12 in the attaching device 10 (dip liquid tank 11), and the dip liquid 12 is attached to the organic fiber cord 50. Next, the excess dip liquid 12 adhering to the organic fiber cord 50 is squeezed out and removed by the respective squeezing rolls 21, 22, and 23 of the squeezing device 20, and the adhesion amount of the dip liquid 12 is adjusted to an appropriate amount. To the inlet side of the drying device 31. In the drying device 31, the microwave irradiation devices 31 </ b> B and 31 </ b> C generate microwaves with the above-described standard output T, and the microwaves are irradiated to the organic fiber cord 50 to which the dip liquid 12 moving through the microwaves adheres. And dry.

  Next, the moisture content of the organic fiber cord 50 dried by the drying device 31 is measured by the non-contact moisture meter 32, and the moisture content data value is output to the control device 40. Receiving this input (S102), the control device 40 (S102) measures the moisture content (input moisture content data value) and the predetermined moisture content target value stored in the memory 43 (here, the figure). The target value of the target moisture content data value 46 of 1 or the target range (upper and lower limit values of the target value) is compared, and the microwave output of the drying device 31 is changed and controlled based on the comparison result.

  Specifically, the control device 40 compares the measured moisture content data value with the target value to determine whether the moisture content data value is within the target range (S103), and if it is within the target range (S103, Yes), it is determined whether or not an operation end instruction is input from the production management system (S106). If there is no input as a result of this determination (S106, No), the process returns to S102, the microwave output of the drying device 31 is maintained at the value set at the start of operation (S101), and the organic fiber cord 50 is used under the conditions. Continue to dry.

  On the other hand, when the input moisture content data value is smaller than the lower limit value of the target range, that is, when the moisture content of the organic fiber cord 50 is low and is too dry (S103, No (small)), First, an increase / decrease amount (ΔT) (see FIG. 2B) of the microwave output of the drying device 31 (microwave irradiation devices 31B and 31C) corresponding to the difference (difference value ΔW) from the target value is an output control table of the memory 43. Read from 48. Next, according to the read value, the drying device 31 is controlled to change the microwave output, and the outputs of the microwave irradiation devices 31B and 31C are reduced (S104). Thereby, the calorific value of the organic fiber cord 50 and the evaporation amount of moisture are decreased, and the moisture content of the dried organic fiber cord 50 that has reached the position of the non-contact moisture meter 32 is increased (direction to be a target range). To control. At this time, the control device 40 reduces the microwave output in accordance with the difference between the measured value of the moisture content and the target value, and adjusts the amount of change in the output in accordance with the difference. Control to the optimal conditions where the rate quickly increases to the target range.

  Further, when the input moisture content data value is larger than the upper limit value of the target range, that is, when the moisture content of the organic fiber cord 50 is high and drying is insufficient than the target (S103, No (large)). First, the increase / decrease amount (ΔT) of the microwave output of the drying device 31 corresponding to the difference (difference value ΔW) from the target value is read from the output control table 48 of the memory 43. Next, according to the read value, the drying device 31 is controlled to change the microwave output, and the outputs of the microwave irradiation devices 31B and 31C are increased (S105). Thereby, the calorific value of the organic fiber cord 50 and the evaporation amount of moisture are increased, and the moisture content of the organic fiber cord 50 after drying is controlled in the direction of decreasing (the target range). At this time, the control device 40 increases the output of the microwave according to the difference between the measured value of the moisture content and the target value, and adjusts the amount of change in the output according to the difference, and the moisture of the organic fiber cord 50 Control to optimal conditions where the rate quickly falls to the target range.

  As described above, the moisture content control device 30 changes the output of the microwave based on the comparison result between the measured value of the moisture content of the dried organic fiber cord 50 and the target value, and the organic fiber cord 50 Feedback control is performed to an optimum condition so that the moisture content falls within the target range, and the drying and moisture content of the organic fiber cord 50 are controlled online. This operation is continuously executed until an operation end instruction is input from the production management system (S102 to S106, No). When the operation end instruction is input (S106, Yes), the operation is ended and the apparatus is operated. Stop (S107).

  Therefore, according to this embodiment, quality checks such as the moisture content of the organic fiber cord 50 being processed, management and the like can be performed in real time, and manufacturing conditions (microwave output) can be changed even during processing. Therefore, it is possible to flexibly cope with fluctuations in the moisture content of the organic fiber cord 50 being processed. In addition, since the moisture content of the organic fiber cord 50 after drying is measured and controlled by feedback control to optimum conditions so that the moisture content falls within a predetermined target range, the longitudinal direction and width of the organic fiber cord 50 are controlled. Variations in moisture content occurring in the direction can be reduced, and the quality of the treated organic fiber cord 50 can be stabilized. At the same time, it is possible to suppress the moisture content of the organic fiber cord 50 from deviating from the target range, and in particular, it is possible to prevent the moisture content from becoming below the target range and approaching 0%. Therefore, it is possible to prevent the occurrence of fusing, strength reduction, and the like caused by approaching, so that the quality can be stabilized.

  Moreover, in this drying apparatus 31, since the microwave is used for drying the organic fiber cord 50, the organic fiber cord 50 to which the dip liquid 12 is attached can be dried in a short time and without unevenness. As a result, the drying process time can be shortened to improve the drying efficiency, and the variation in the moisture content of the organic fiber cord 50 in the width direction can be effectively reduced. Therefore, the above-described wet heat deterioration and scale generation of the organic fiber cord 50 can be suppressed.

  Here, the appropriate moisture content of the organic fiber cord 50 differs depending on the material of the fiber (for example, nylon, rayon, PET, etc.), and its target value and target range are also different. The target value and target range of the moisture content differing for each material of the organic fiber cord 50 are used. Accordingly, each target value and target range for each of a plurality of materials is stored in advance in the memory 43 of the control device 40 so that each target value and target range to be used according to the material of the organic fiber cord 50 can be selected. To do.

  Moreover, in the above embodiment, the measured value of the moisture content of the organic fiber cord 50 (here, the moisture content data value that is the indication value of the non-contact moisture meter 32) is the target value that is the median value of the target range. In contrast, for example, it may be compared with a target range (upper and lower limit values of the target value), and the output may be changed and controlled according to the difference. Similarly, the measured value of the moisture content that is the object of comparison is calculated by converting the moisture content corresponding to that value using the moisture content conversion table 45 of the memory 43 in addition to the moisture content data value, and calculating The value may be compared with the target value or target range (target moisture content 44 in FIG. 1), and the output of the microwave may be changed and controlled based on the comparison result.

  Further, in this moisture content control device 30, the microwave output was changed when the measured value of the moisture content of the organic fiber cord 50 deviated from the target range, but the measured value of the moisture content was within the target range. Alternatively, the output of the microwave may be changed and controlled according to the difference from the target value that is the median value of the target range. In this case, since the moisture content of the organic fiber cord 50 is feedback controlled so as to always approach the target value, the fluctuation can be further suppressed.

  In addition, the organic fiber cord 50 controlled to an appropriate moisture content as described above moves toward a heat treatment apparatus which is the next process, and is subjected to high-temperature heat treatment, heat stretching treatment, or the like in the heat treatment apparatus. As a result, the organic fiber cord 50 is modified to adjust the physical properties, and then wound with a winding device to continuously produce a rubber reinforcing cord. This heat treatment apparatus may be a general apparatus such as a hot-air heating type. However, when an apparatus for performing heat treatment by irradiating the organic fiber cord 50 with far infrared rays, the surface of the organic fiber cord 50 is effective. It is more desirable because the processing time can be shortened by heating uniformly and uniformly, and the temperature rise due to the heating inside thereof can be suppressed to prevent deterioration of characteristics.

  Further, in the drying device 31 of the present embodiment, the organic fiber cord 50 is dried only by the microwave irradiation devices 31B and 31C. However, the drying device 31 is provided with a hot air generator, and drying by microwaves and hot air is performed. You may use together combining drying.

(Moisture control test)
In order to confirm the effect of the present invention, a rubber reinforcing cord manufacturing apparatus (hereinafter referred to as an example) including the organic fiber cord 50 moisture content control device 30 described above and a conventional manufacturing apparatus (hereinafter referred to as a comparative example). The rubber fiber cord was manufactured by applying various treatments to the organic fiber cord 50 and comparing the moisture content and the like.

  Each of the devices of the example and the comparative example has a drying device 31 and a similar configuration in addition to the attaching device 10 (see FIG. 1) provided with the dip solution tank 11 for attaching the dip solution 12 to the organic fiber cord 50. A heat treatment apparatus. The drying device 31 is provided with a hot air generator in addition to microwave irradiation devices 31B and 31C (TMG-490C (water-cooled), wavelength 2450 MHz, manufactured by Shibaura Mechatronics) that generate microwaves and irradiate the organic fiber cord 50. used. For the heat treatment apparatus, a far red heater (output 16 kW / m) was used to irradiate the organic fiber cord 50 by irradiating far infrared rays and to circulate the gas in the apparatus with a circulation fan.

  In addition to the above, in the apparatus of the embodiment, a non-contact moisture meter 32 (ST2200A manufactured by Sensortech Systems Inc.) is installed at the outlet of the drying device 31, and the control device 40 described above that changes and controls the output of the microwave. (See FIG. 1). Thus, the moisture content control device 30 of the organic fiber cord 50 is configured, and the dip liquid 12 is adhered by changing the output of the microwave based on the measured value of the non-contact moisture meter 32 by the method described above. The organic fiber cord 50 was dried and the moisture content was controlled. On the other hand, the apparatus of the comparative example is not provided with the non-contact moisture meter 32 and the microwave control device 40, and the output of the microwave irradiation devices 31B and 31C of the drying device 31 is set to a constant value and the organic fiber cord 50 is set. Dried.

  The organic fiber cords 50 used in Examples and Comparative Examples are organic fiber cords 50 having PET, 1100 dtex, twisted structure 1100 dtex / 2 and a twist number of 47 times / 10 cm (both vertically). The organic fiber cord 50 was processed with each of the devices of Examples and Comparative Examples to produce a rubber reinforcing cord, and the moisture content was measured using an electronic moisture meter manufactured by Shimadzu Corporation.

First, in the apparatus of the example, the moisture output of the organic fiber cord 50 was measured by changing the microwave output of the drying device 31, and the relationship between the microwave output and the moisture content was confirmed.
FIG. 4 is a graph showing the measurement results.
As shown in the figure, the moisture content of the organic fiber cord 50 decreases as the microwave output of the drying device 31 increases, and it can be confirmed that the moisture content changes in conjunction with the change in the microwave.

  Next, rubber reinforcing cords are manufactured using the devices of the examples and comparative examples, and variations (standard deviation: σ) in the longitudinal and width directions of the moisture content of the cords are obtained and compared, and the moisture of the organic fiber cord 50 The fusing probability (%) due to the rate approaching 0% was determined and compared. The results are shown in Table 1.

  As shown in Table 1, the code moisture content variation (σ) of the comparative example was 0.07 in both the longitudinal direction and the width direction, whereas it was found to be 0.03 in the example. It was. Further, the fusing probability due to the moisture content of the organic fiber cord 50 approaching 0% is 3% in the comparative example, but 0% in the example, and it is found that such fusing can be completely prevented. It was.

  From the above results, according to the present invention, the moisture content of the dried organic fiber cord 50 can be controlled to be within a predetermined target range, and the variation in the moisture content in the longitudinal direction and the width direction can be reduced. It was proved that the quality can be stabilized by preventing the occurrence of fusing.

It is a schematic diagram which shows the structure of the principal part in the manufacturing apparatus of the cord for rubber reinforcement of this embodiment. It is a table | surface which shows the correspondence of the moisture content of the organic fiber cord memorize | stored in memory of the control apparatus, and the output of a microwave. It is a flowchart which shows operation | movement of a moisture control apparatus. It is a graph which shows the relationship between the output of a microwave, and a moisture content.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of the cord for rubber reinforcement, 2 ... Pull roll 3, 4, 5 ... Free roll, 10 ... Dip liquid adhesion apparatus, 11 ... Dip liquid tank, 12 ...・ Dip liquid, 20 ... squeezing device, 21, 22, 23 ... squeezing roll, 30 ... organic fiber cord moisture control device, 31 ... drying device, 31B, 31C ... micro Wave irradiation device, 32 ... Non-contact moisture meter, 40 ... Control device, 50 ... Organic fiber cord.

Claims (6)

The organic fiber cords are moved in succession to a method for producing a rubber-reinforcing cord for manufacturing a rubber-reinforcing cord,
Attaching a dip solution to the organic fiber cord;
Irradiating the organic fiber cord to which the dip solution is adhered with microwaves and drying;
A step of measuring the moisture content of the organic fiber cord obtained by the drying,
A step of comparing the target value of the measured value with a predetermined water fraction of the moisture content,
Based on the comparison result, and a step of changing the microwave output as moisture content of the organic fiber cord obtained by the drying of the target range,
A method for producing a rubber reinforcing cord, wherein the steps are continuously performed . In the manufacturing method of the cord for rubber reinforcement according to claim 1,
Method of manufacturing a rubber-reinforcing cord according to claim Rukoto to have a heat treatment step of modifying the organic fiber cord. In the manufacturing method of the cord for rubber reinforcement according to claim 1 or 2,
The method for producing a rubber reinforcing cord, wherein the organic fiber cord is a single-wire organic fiber cord or a braided organic fiber cord that does not have one or a plurality of wefts. An apparatus for manufacturing a rubber reinforcing cord for manufacturing a rubber reinforcing cord by continuously moving an organic fiber cord,
An attachment device for attaching a dip solution to the organic fiber cord;
A drying device for drying by microwave irradiation to the organic fiber cord in which the dip solution adheres,
Measuring means for measuring the moisture content of the dried organic fiber cord, arranged along the movement path of the organic fiber cord;
The measured value of the moisture content is compared with a predetermined target value of the moisture content, and based on the comparison result, the moisture content of the dried organic fiber cord is adjusted to be within the target range. A control device for changing and controlling the output of the wave;
An apparatus for manufacturing a rubber reinforcing cord, comprising: In the rubber reinforcing cord manufacturing apparatus according to claim 4,
An apparatus for producing a rubber reinforcing cord, comprising a heat treatment device for modifying the organic fiber cord . In the apparatus for manufacturing a rubber reinforcing cord according to claim 4 or 5,
The apparatus for producing a rubber reinforcing cord, wherein the organic fiber cord is a single-wire organic fiber cord or a braided organic fiber cord that does not have one or a plurality of wefts .

Images