JP5015108B2 - Laminate roll temperature control method - Google Patents

Description

  The present invention relates to a method for controlling the temperature of a laminate roll in a facility for thermocompression bonding a resin film using a laminate roll on both sides or one side of a metal strip heated to a predetermined temperature, particularly when a product is changed or a line is started up. The present invention relates to a temperature control method for a laminate roll at the time.

  A laminated metal plate with a resin film laminated on its surface, such as a steel plate for food cans, sends a metal band heated to a predetermined temperature between a pair of left and right laminating rolls together with the resin film, and puts the resin film on the surface of the metal band Manufactured by thermocompression bonding. In this step, it is necessary to appropriately control the surface temperature of the metal strip and the laminate roll. In particular, the surface temperature of the laminate roll is determined by the delicate heat balance between the heat conductivity of the heated metal strip, the heat removal by the resin film, and the heat removal by the cooling roll. It is required to be controlled to a range.

  For this reason, as shown in Patent Document 1, a device that controls the temperature of a metal strip by a large number of induction heating rollers, or as shown in Patent Document 2, a plurality of cooling rolls are brought into contact with the surface of the laminate roll for lamination. Various proposals such as an apparatus for controlling the surface temperature of the roll in the width direction have been made.

  However, any of these conventional techniques is a temperature control technique in a steady operation state, and no special consideration is given at the time of product change or line startup. For this reason, it takes 10 minutes or more for the surface temperature of the laminate roll to reach a steady state, and the product produced during that time becomes a defective product, resulting in a decrease in yield, deterioration in manufacturing cost, and energy loss. It was the cause.

Specifically, the control of the surface temperature of the laminating roll changes the cooling water temperature passed through the cooling roll in contact with the laminating roll so that the surface temperature of the laminating roll detected by the temperature sensor becomes the target temperature. As shown in FIG. 1, the surface temperature of the laminating roll is low during the line stop, and the control is started so as to reach the target temperature as the operation starts, and the temperature is rapidly increased. . However, due to the occurrence of overshoot, it takes 10 minutes or more after the operation is started until the temperature stabilizes. Although it is conceivable to increase the control responsiveness in order to increase the temperature rise rate, if the control responsiveness is excessively increased, control swell (control hunting) may occur in a steady operation state.
JP 2001-185337 A JP-A-5-92487

  Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and can stabilize the surface temperature of the laminating roll at the target temperature in a shorter time than before when changing the product type in the laminating equipment or when starting up the line. Moreover, it is possible to provide a method for controlling the temperature of the laminate roll that can also suppress the control swell in the steady operation state and thereby can significantly reduce the yield failure.

  The temperature control method of the laminate roll of the present invention made to solve the above-mentioned problems is a temperature control method of a laminate roll in which a resin film is thermocompression bonded to the surface of a metal strip that has been heated, When starting up the line, start the operation after setting the cooling water temperature passed through the cooling roll in contact with the laminating roll to the target water temperature in advance. The cooling water temperature is controlled so that

  In addition, it is preferable to determine the target water temperature of cooling water temperature based on the actual value at the time of non-defective product manufacture like Claim 2. Further, as in claim 3, the control parameter is automatically switched so that the control period of the cooling water temperature is shortened when changing the product type or the line is started up, and the control period is lengthened after the plate temperature of the metal strip is stabilized. Is preferred. Further, as in claim 4, it is preferable to control the temperature of the cooling water passed through the cooling roll by a heat exchanger.

  According to the present invention, when the product is changed or the line is started up, the operation is started after the cooling water temperature passed through the cooling roll contacting the laminate roll is set to the target water temperature in advance. The surface temperature is in the vicinity of the target temperature. For this reason, it does not take a long time to stabilize the temperature as in the prior art. Moreover, since it is not necessary to excessively increase the control responsiveness in order to increase the temperature raising rate, it is possible to greatly reduce yield defects.

  According to invention of Claim 2, since the target water temperature of cooling water temperature is determined based on the actual value at the time of manufacture of quality goods, the surface temperature of a lamination roll can be made into a preferable temperature simultaneously with the start of operation. Note that the target water temperature of the cooling water temperature can be estimated using a prediction formula even for varieties that have not been produced in the past.

  According to the invention of claim 3, the control parameters are automatically switched so that the control period of the cooling water temperature is shortened when the product is changed or the line is started up, and the control period is lengthened after the plate temperature of the metal strip is stabilized. . As a result, it is possible to achieve both shortening of the temperature raising time and suppression of control swell in the steady operation state.

  According to the invention of claim 4, since the cooling water temperature passed through the cooling roll is controlled by the heat exchanger, low-cost operation using a heat source such as steam becomes possible.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 2 is a diagram for explaining an embodiment of the present invention, wherein 1 is a pair of left and right laminate rolls, and 2 is a cooling roll disposed in close contact with the outer surface of each laminate roll 1. In FIG. 2, only one cooling roll 2 is shown, but a plurality of cooling rolls may be arranged. 3 is a metal band to be laminated, and 4 and 5 are resin films. The metal strip 3 is, for example, a thin steel plate, and is heated to a predetermined temperature by the heating device 6 and then fed between the laminate rolls 1. The resin films 4 and 5 are fed between the laminate rolls 1 from both sides of the metal band 3 and are thermocompression bonded (laminated) by the laminate rolls 1. In FIG. 2, the resin films 4 and 5 are laminated on both surfaces of the metal strip 3, but may be one surface.

  As described above, the surface temperature of the laminate roll 1 is determined by the delicate heat balance of the heat conductivity of the heated metal strip 3, the heat removal by the resin films 4 and 5 and the heat removal by the cooling roll 2, In order to continue producing good products, it is required to be controlled within a very narrow temperature range (for example, 90 to 93 ° C.). In the present invention, the surface temperature of the laminate roll 1 is performed by changing the temperature of the cooling water passed through the cooling roll 2 by the heat exchanger 7. Reference numeral 8 denotes a cooling water tank having a temperature adjustment function, and the cooling water is passed through each cooling roll 2 through a piping system. The description will be made assuming that the water temperatures of the cooling water passed through both cooling rolls 2 are the same. However, when the materials of the resin film 4 and the resin film 5 are different, water is passed through each cooling roll 2. It is preferable to control the water temperature of the cooling water to be individually controlled.

  The heat exchanger 6 is provided with a heat source supply line 9, and the control device 10 controls the heat source supply amount. Further, a cooling water temperature sensor 11 passed through the cooling roll 2 and a surface temperature sensor 12 of the laminating roll 1 are connected to the control device 10 to control the cooling water temperature and the surface temperature of the laminating roll 1. Input to the device 10. In FIG. 2, only the control device 10 on one side is shown, but the same applies to the opposite side. In the steady operation state, the control device 10 controls the heat source supply amount to the heat exchanger 7 so that the surface temperature of the laminate roll 1 detected by the surface temperature sensor 12 becomes the target temperature, and water is passed through the cooling roll 2. The cooling water temperature is controlled.

  However, since the operation is stopped when the product is changed or the line is started up, as described above, it takes 10 minutes or more after the operation is started until the temperature is stabilized in the above-described normal laminate roll temperature control method. It is. Therefore, in the present invention, when changing the product type or starting up the line, the temperature of the cooling water passed through the cooling roll 2 in contact with the laminate roll 1 is raised in advance to the target water temperature, and the operation is started from that state.

  It is preferable to determine the target water temperature of the cooling water used here based on the past operating condition actual value at the time of good product manufacturing. The operating condition result value can be acquired according to the flow shown in FIG. That is, the operation condition when the variation in the surface temperature of the laminate roll 1 falls below the predetermined range (X0) may be automatically recorded on the storage medium. An example of the operating conditions is as shown in Table 1. The sheet feeding speed of the metal strip 3, its thickness, the type and thickness of the resin films 4 and 5, the target temperature of the laminate roll 1, the cooling water temperature, etc. Stored as a table. As shown in Table 1, when the types and thicknesses of the resin films 4 and 5 are different, the temperatures of the left and right laminate rolls 1 need to be changed accordingly, so that the cooling water temperature is also set individually. In addition, since the temperature of the cooling water and the temperature of the laminate roll 1 are almost proportional, even when the resin films 4 and 5 are new materials that have not been used in the past, a predictive model is constructed to obtain an accurate target water temperature. Setting is possible.

  As shown in the graph of FIG. 3, the laminating roll is started at the same time as the operation is started with the temperature of the cooling water passed through the cooling roll 2 in contact with the laminating roll 1 being raised to the target temperature in advance. The temperature of 1 is the temperature in the steady operation state. As can be seen by comparing FIG. 3 with FIG. 1 showing the prior art, it takes a considerable time until the temperature of the laminate roll 1 is stabilized after the plate temperature of the metal strip 3 reaches a steady state. During that time, product defects occurred. On the other hand, according to this invention, if the plate | board temperature of the metal strip 3 reaches a steady state, it can transfer to the steady operation which does not generate | occur | produce a product defect after that. Specifically, we succeeded in significantly reducing the occurrence time of product defects from the conventional 10 minutes to 6 minutes.

  In addition, after the plate | board temperature of the metal strip 3 is stabilized, operation | movement of the control apparatus 10 is switched and normal control which controls a cooling water temperature so that the surface temperature of the laminate roll 1 may become target temperature is performed. In this case, it is preferable to automatically switch the control parameter (PID constant) of the cooling water temperature to lengthen the control cycle and suppress the control swell in the steady operation state.

  FIG. 5 is a flowchart showing the contents of the present invention described above. When starting, a product condition search is first performed (S1), and if there is a condition that matches a condition from past operation condition results (S2), Cooling water temperature setting control is started (S3). When the temperature deviation of the cooling water temperature T detected by the water temperature sensor 11 becomes equal to or less than the predetermined set value X1 (S4), the PID control parameter is changed to the α pattern (S5), and the temperature deviation of the water temperature T is further changed. When the value becomes equal to or less than the predetermined set value X2 (S6), the PID control parameter is changed to the β pattern (S7). Here, X1> X2, and the control cycle of the α pattern <the control cycle of the β pattern.

  According to the temperature control method of the laminate roll of the present invention described above, the surface temperature of the laminate roll 1 can be stabilized at the target temperature in a shorter time than before when the product is changed or the line is started up. Control swell in the driving state can also be suppressed, and thereby yield defects can be greatly reduced.

It is a graph which shows the temperature of the lamination roll at the time of the conventional line start-up, plate | board temperature, and line speed. It is explanatory drawing of embodiment of this invention. It is a graph which shows the temperature of the lamination roll at the time of line starting by this invention, plate | board temperature, and a line speed. It is a flowchart which shows the acquisition method of operation condition results value. It is a flowchart which shows the content of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminate roll 2 Cooling roll 3 Metal strip 4 Resin film 5 Resin film 6 Heating device 7 Heat exchanger 8 Cooling water tank 9 Heat source supply line 10 Controller 11 Water temperature sensor 12 Surface temperature sensor

Claims (4)

  This is a temperature control method for a laminating roll in which a resin film is thermocompression bonded to the surface of a metal strip that has been heated, and the cooling water temperature that is passed through the cooling roll in contact with the laminating roll at the time of product change or line startup A temperature control method for a laminating roll, characterized in that the cooling water temperature is controlled so that the temperature of the laminating roll becomes a target temperature after starting the operation after setting the target water temperature and the plate temperature of the metal strip is stabilized. .   The method for controlling a temperature of a laminate roll according to claim 1, wherein the target water temperature of the cooling water is determined based on the actual value at the time of manufacturing the non-defective product.   2. The control parameter is automatically switched so as to shorten the control period of the cooling water temperature when changing the product type or starting the line, and to increase the control period after the plate temperature of the metal strip is stabilized. Temperature control method for laminating rolls.   The temperature control method for a laminate roll according to claim 1, wherein the temperature of the cooling water passed through the cooling roll is controlled by a heat exchanger.

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