JPH04120013U - T-die - Google Patents

Abstract

(57) [Summary] [Purpose] Determine invisible deterioration or poor installation of the T-die temperature sensor from the difference between the detection output and the temperature setting, maintain normal temperature distribution, and This prevents thickness unevenness. [Configuration] The die body 1 is divided into a plurality of temperature control areas, and a body heater 16 is provided in each temperature control area.
and a temperature regulator 19 controlling the lip heater 17
The set voltage of the temperature setting device 18 that instructs the set temperature and the detection output (voltage) of the temperature detector 22 inserted into the temperature detection hole 23 of each temperature management area are displayed on the display 21, and both voltages are displayed on the display 21. This system is designed to determine whether temperature control is malfunctioning based on the difference in temperature.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses molten synthetic resin in sheet or film form (hereinafter referred to as film). Regarding the T-die for extrusion.

0002

[Conventional technology]

Figure 3 is a cross-sectional view of a conventional general T-die for forming equipment for films, etc. It is an AA sectional view of. This T-die is connected to a molten resin pumping device (not shown). It has a manifold 2 extending in a straight line from the lower end of the supply pipe 15 in the main body 1, Furthermore, it has a planar passage 3 extending downward from the manifold 2 over its entire width. Ru.

0003 A pair of lips 4 and 5 are connected to a bolt 6 and a differential bolt 7 on the bottom surface of the die body 1. These lips 4 and 5 are fixed to both sides of the lower end of the planar passage 3. It constitutes a lip land portion 8.

0004 Furthermore, the T-die has a manifold to prevent uneven thickness of the extruded film 20. Divide multiple temperature control areas in the direction of Hold 2, and set each temperature control area separately. Die body 1 is provided with body heaters 16, 16 on both sides of the upper end, and lips 4, 5 are provided with body heaters 16, 16 on both sides of the upper end. is provided with lip heaters 17, 17.

[0005] In addition, 10 is a cooling roll provided below the die body 1, and 11 is also a series. It is a congo roll.

[0006] As shown in FIG. 4, such a T-die has holes to be formed at both ends of the planar passage 3. In order to adjust the width of the film etc. 20, the pair of forming plates 12 can be moved left and right. An operating rod 13 is connected to the outer surface of the forming plate 12. Then, this operating rod 13 is extended outside the die body 1, and this protruding end can be operated. The forming plate 12 is moved left and right by Adjusting the width.

[0007] Also, the sealing rod 14 of the lip land portion 8 is the same as the forming plate 12. Similarly, one end is extended outside the die body 1, and together with the forming plate 12, The width of the lip land portion 8 is adjusted by moving left and right.

[0008] In this device, the molten resin is supplied from the central supply pipe 15, and the arrow shown in FIG. As shown in the figure, the width of the planar passage 3 is widened by the manifold 2, and the forming plate is Both ends are regulated by 12 and a sealing rod 14 and formed into a film or the like 20.

[0009] In this case, temperature unevenness occurs due to partial cooling of the T-die, and the film, etc. In order to prevent unevenness in the thickness of the The body heater 16 is used in the main body 1, and the lip heater 1 is used in the lip land portion 8. 7, set the temperature distribution with the temperature setting device 18 so that the predetermined temperature distribution is achieved, and set the temperature. The temperature of each main body heater 16 and lip heater 17 is adjusted by the regulator 19. There is.

0010 Generally, a thermocouple is used as the temperature sensor 22 for this adjustment. The pair reaches the back (bottom) of the temperature detection hole 23 drilled in the die body 1 for each temperature control area. is inserted, converts the temperature at each point into a detection voltage and inputs it to the temperature controller 19, and this The temperature controller 19 adjusts the set temperature of each temperature control area set by the temperature setting device 18. By comparison, adjust the main body heater 16 and lip heater 17 so that the error is zero. It is knotted.

[0011]

[Problem that the idea aims to solve]

The above-mentioned temperature management is performed to ensure that the characteristics of the temperature detector 22 are not deteriorated and that the temperature is maintained at a predetermined temperature. It is absolutely necessary that the sensor be completely inserted into the depth detection hole 23.

0012 However, the characteristics of the thermocouple used in the temperature detector 22 change over time and deteriorate. This is normal, and it is not possible to visually check whether it is inserted all the way into the temperature detection hole 23. It's impossible.

[0013] The present invention solves the above-mentioned problems and makes it possible to visually check the status of the temperature sensor 22, which is invisible to the naked eye. We offer a T-die that can be converted into a functional state and monitored to prevent thickness unevenness in films, etc. The challenge is to provide

[0014]

[Means to solve the problem]

In order to solve the above-mentioned problems, in synthetic resin molding equipment, pressure is removed from molten resin pumping equipment. A supply pipe 1 provided in the center of the die body 1 to receive the sent molten resin. A manifold 2 extending in a straight line on the tip side of 5 and the lower side of this manifold 2 A planar passage 3 connected to the entire width of the planar passage 3, and a lip provided at the lower end of this planar passage 3. In a T die consisting of a land portion 8, the temperature of the die body 1 is controlled by the manifold. The main unit is divided into multiple temperature control areas in the direction of LED 2. A heater 16, a temperature detector 22, a temperature setting device 18, and a temperature controller 19 are provided. The set value of the temperature setting device 18 and the detected value of the temperature detector 22 are A display 21 is provided to display information for each temperature management area.

[0015] Note that the temperature setting device 18, temperature controller 19, and display device 21 are one set, and each temperature The main body heater 16 and lip heater 17 in the temperature control area are switched sequentially at regular intervals. Some devices are configured to be connected to a remote control to control temperature.

[0016]

【Example】

FIG. 1 is a configuration diagram of the T-die temperature control mechanism of the present invention. This configuration is the conventional configuration shown in Figure 2. In addition to the configuration, the detection voltage of the temperature detector 22 (detector side input of the temperature controller 19) and the setting voltage of the temperature setting device 18 (the setting side input of the temperature controller 19). A container 21 is provided.

[0017] For example, the above-mentioned temperature detection is performed using a thermocouple. Depending on the standard of the thermocouple used, the temperature and There is a certain correlation with the output voltage. Based on this correlation, a given temperature is reached. The voltage is input from the temperature setting device 18 to the temperature controller 19 as a set voltage so that the voltage is set.

[0018] On the other hand, the detected voltage from the temperature detector 22 is input to the temperature controller 19. Therefore, if these set voltages and detection voltages match, each temperature control area is Each temperature is controlled to a predetermined temperature.

[0019] By displaying these set voltage and detection voltage on the display 21, both voltages can be If they match, temperature control is being performed smoothly; however, if they do not match, If the detection voltage is low (in most cases the detection voltage is low), the temperature control is poor, and the detection voltage is low. In this case, the temperature regulator 19 operates to raise the temperature. As a result, the temperature of the T-die is The temperature becomes higher than the set temperature.

[0020] In such a case, the entire width of the T-die is divided into multiple temperature control areas as described above. Therefore, if one or several of these temperature control areas have the above temperature control problems, If this happens, the overall temperature distribution will be disturbed, resulting in the extruded film etc.20 This results in uneven thickness.

[0021] The cause of this is the invisible deterioration of the thermocouple as described above, and the temperature detection hole 23. It is possible to detect incomplete insertion and take measures such as replacement or re-insertion.

[0022] Note that the temperature setting device 18, temperature controller 19, and display device 21 are one set, and each temperature tube The main body heater 16 and lip heater 17 in the control area are switched and connected sequentially at regular intervals. Of course, it is also possible to configure the system so that temperature management is performed subsequently.

[0023]

[Effect of the idea]

As mentioned above, deterioration of thermocouples and insertion of thermocouples as invisible temperature detectors Malfunctions in temperature control due to imperfections can be prevented, and as a result, film etc. due to temperature unevenness can be prevented. It is possible to prevent thickness unevenness.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a T-die temperature control mechanism of the present invention.

FIG. 2 is a configuration diagram of a conventional T-die temperature control mechanism.

FIG. 3 is a cross-sectional view of a conventional general T-die for forming equipment for films and the like.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

[Explanation of symbols]

1 Die body 2 Manifold 3 Planar passage 4 Lip 5 Lip 8 Ripland section 15 Supply pipe 16 Body heater 17 Lip heater 18 Temperature setting device 19 Temperature controller 21 Display 22 Temperature detector 23 Temperature detection hole

Claims (2)

[Scope of utility model registration request] Claim 1: A synthetic resin molding device comprising: a manifold extending in a straight line at the tip side of a supply pipe provided in the center of a die body to receive molten resin pumped from a molten resin pumping device; In a T-die consisting of a planar passage continuous to the entire width of the lower side and a lip land section provided at the lower end of the planar passage, the temperature control of the die body is performed by a plurality of temperature controls in the direction of the manifold. Each temperature control area is provided with a main body heater, a temperature detector, a temperature setter, and a temperature controller, and the set value of the temperature setter and the detected value of the temperature detector are A T-die characterized in that a display device is provided to display each of the temperature control areas. 2. The temperature setting device, the temperature controller, and the display device are configured as one set, and the temperature control is performed by sequentially switching and connecting the main body heater and lip heater of each temperature control area at fixed time intervals. T according to claim 1, characterized in that
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