JPH0518942B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for drying packaged fiber products such as cheese and an apparatus used therefor. [Prior Art] When drying a packaged textile product such as cheese that has been wet after dyeing, washing, etc., an apparatus as shown in FIG. 5 has conventionally been used. This device includes a blower 1, a heater 2, a drying pot 3,
The drying pot 3 is loaded with hot air that circulates through a circulation path from the blower 1, through the heater 2, the drying pot 3, the cooler 4, and back to the blower 1. The packaged textile product 5 can be dried. Drying in the drying pot 3 is first carried out in the drying pot 3.
The dehydration process involves pressurizing the inside of the package and dehydrating it from the outside to the inside, and the drying process involves passing hot air from the inside of the package to the outside to evaporate the moisture between the fibers. Drying is almost complete. At this point, the process is divided into a humidity control process in which the humidity is controlled by passing hot air from the outside to the inside of the package cage. It's becoming controlled. For example, as shown in FIG. 6, the dehydration is performed for a predetermined period of time preset by the timer _T1 (the direction of the hot air in the drying pot 3 is from the outside to the inside of the package),
After a predetermined period of time has elapsed, a switching mechanism is operated to reverse the direction of the hot air and release pressure for dehydration. Then, as the drying progresses, the temperature inside the package rises and when the moisture has sufficiently evaporated, the timer _T2 is activated, and after a preset period of time has elapsed, the switching pot is activated and the drying pot 3 is turned on again. Change the direction of hot air inside from the outside of the package cage to the inside. In this state,
The humidity control process is performed for a predetermined time determined by a timer _T3 . However, while the above-mentioned three-stage process is progressing, the temperature of the hot air sent into the drying pot 3 is consistently controlled to be a constant set value. This control is performed by providing a temperature sensor B (see Figure 5) on the outlet side of the heater 2 and controlling the heater 2 so that the temperature of this temperature sensor B is always maintained at a constant value P. ing. Note that the set value P is set in advance depending on the type of textile product 5 to be dried, processing conditions, etc. In addition, the operation of the timer _T2 starts when the dryer outlet temperature, which is read by the temperature sensor This is done by transmitting an operation instruction signal at this stage. [Problems to be Solved by the Invention] However, in such a drying method, the time required for the drying step to evaporate the moisture between the fibers is long, so it is an important problem to shorten the time. On the other hand, it is possible to accelerate drying by setting the hot air temperature higher, but if the temperature is set higher than the appropriate hot air temperature that has been empirically established, textile products will not be heated excessively. Due to this, the oiling agent impregnated to give the thread smoothness burns, causing oiling burn phenomenon, which yellows the fiber surface and causes a decrease in quality. Another problem was that the thread handling became poor and the thread surface was damaged. The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method and apparatus for drying textile products that can shorten the drying time without damaging the textile products. [Means for Solving the Problems] In order to achieve the above object, the present invention provides hot air that circulates through a circulation channel from a blower through a heater, a drying pot, a cooler, and back to the blower, to the drying pot. In a method of drying a packaged textile product loaded in a package by passing it from the inside to the outside, the internal temperature of the packaged textile product is determined over time to determine the point at which moisture evaporation from the fiber surface of the packaged textile product is completed. The temperature of the hot air is set higher than the appropriate drying temperature for the textile product until the moisture evaporation is completed, as read by a temperature sensor read by a temperature sensor, and as soon as the moisture evaporation is completed, the hot air is heated. The first method of drying packaged textile products is to reduce the temperature of hot air to the appropriate temperature for drying textile products.
The gist of this is that hot air circulates through a circulation path from the blower through the heater, drying kettle, cooler, and back to the blower, and passes from the inside of the package cage of the packaged textile product loaded in the drying pot to the outside. The apparatus includes an internal temperature sensor A that reads the internal temperature of the packaged textile product over time, a heater outlet temperature sensor B that reads the hot air temperature on the exit side of the heater over time, and a heater outlet temperature sensor B that reads the temperature of the hot air on the outlet side of the heater over time. a setting device C into which a temperature S at which moisture evaporation from the fiber surface of the textile product is completed is input in advance;
A setting device D into which two types of temperatures, an appropriate drying temperature P for textile products and a predetermined temperature Q higher than the above-mentioned appropriate temperature, are input in advance, and a heater outlet temperature read by the heater outlet temperature sensor B. a heating control means for controlling hot air heating by the heater so that the temperature matches either the set temperature P or Q inputted to the setting device D, and the temperature S inputted to the setting device C and the internal temperature sensor A; and an instruction means for momentarily comparing the temperature read by the heater and the temperature read by the heater, and instructing the heating control means to change the temperature when the two match, so that the temperature at the outlet of the heater is equal to the temperature inside the textile product from the start of operation. Until the set temperature S is reached, the temperature is controlled to match the temperature Q higher than the proper drying temperature, and as soon as the set temperature S is reached, the temperature is controlled to match the proper drying temperature P. The second gist is a drying device for packaged textile products. [Function] In other words, the present inventor has found that in a wet state where the textile product has not been sufficiently heated, even if the hot air temperature is higher than the temperature that has conventionally been considered to be an appropriate temperature, the fiber will not be damaged. We conducted a series of studies based on the idea that this might simply accelerate the evaporation of water within the fibers. They then conducted further research on how to determine when textile products have been sufficiently warmed to most effectively shorten drying time without impairing the quality of the textile products. As a result, when drying packaged textile products, hot air passes from the inside of the package to the outside, and drying progresses from the inside of the package. It was found that the temperature hardly rose, and when there was no moisture inside, the temperature rose rapidly, and then the evaporation of moisture on the surface of the package was completed immediately. For this reason, if the temperature on the surface of the package of textile products is read over time with a temperature sensor and the temperature of the hot air is controlled using the increase in temperature as an indicator, the moisture evaporation inside the package will have already been completed at that point. As a result, the timing of lowering the hot air temperature is delayed, causing damage to the yarn. Furthermore, reading the temperature change inside the drying kettle or the change in the temperature of the hot air on the outlet side of the drying kettle delays the above-mentioned timing even further, resulting in severe damage to the yarn. Therefore, if a temperature sensor is inserted inside the textile product to read the internal temperature change of the textile product over time, and the temperature of the hot air is controlled using the rising change as an indicator,
The inventors have discovered that it is possible to apply high-temperature hot air to the limit without damaging the yarn, without causing a lag between the time when moisture evaporation on the fiber surface is completed and the time when the temperature of the hot air changes, and the present invention has been achieved. Next, the present invention will be explained in detail based on examples. [Embodiment] FIG. 1 shows an embodiment of the drying apparatus of the present invention. This drying device is similar to conventional drying devices,
Blower 1, heater 2, drying pot 3, cooler 4
The drying pot 3 is heated by the hot air circulating in the circulation channel from the blower 1 through the heater 2, the drying pot 3, the cooler 4, and back to the blower 1.
The package textile product 5 loaded therein can be dried. Also, heater 2
A temperature sensor B is provided on the exit side of the drying pot 3, and a temperature sensor X is provided on the exit side of the drying pot 3. Furthermore, this device is provided with an internal temperature sensor A whose sensor section is inserted into the fibers of the packaged textile product 5, as shown in FIG. Data from each of these temperature sensors A, B, and X is read over time, and the stepwise progression of dehydration→drying→humidity control is automatically controlled. The above control is performed in accordance with instructions from a control panel 10 having a configuration as shown in FIG. 3, for example. That is, the control panel 10
, there is a setting device C in which the temperature S at which moisture evaporation from the fiber surface of the textile product 5 to be dried is completed is input in advance, and an appropriate temperature P for drying the textile product 5.
and a predetermined temperature Q higher than the appropriate temperature P are input in advance to the setting device D; and the heater outlet temperature read by the heater outlet temperature sensor B is input to the setting device D. a heating control means 11 for controlling the hot air heating by the heater 2 so as to match either the set temperature P or Q set by the controller C; and a set temperature S input to the setter C and an internal temperature sensor inserted into the fiber. An instruction means 12 is provided which momentarily compares the fiber internal temperature read by A and gives a temperature change instruction to the heating control means 11 when the two match. In addition,
The temperature S at which moisture evaporation from the fiber surface of the textile product 5 is completed means that as drying progresses, the water film covering the fiber surface evaporates, the fiber is exposed, and the internal temperature of the fiber itself increases as the fiber is heated. This is the temperature at which the temperature begins to rise rapidly. This temperature S is set in advance using the setting device C based on the type of fiber, processing conditions, etc.
is input. Further, the appropriate temperature P for drying the textile product 5 is the appropriate hot air temperature for drying that has been known empirically, and drying at a higher temperature will eventually damage the fibers. This is the temperature that is said to cause This temperature is also input in advance to the setting device D based on the type of fiber, processing conditions, etc. For example, for cotton products obtained by general dyeing methods, P is set to be 105 to 110°C, and for wool products, P is set to be 95 to 100°C. The predetermined temperature Q higher than the appropriate temperature P is, for example,
Refers to a temperature of 130-135℃. Therefore, according to this drying device, as shown in FIG. 4, the internal temperature of the textile product 5 read by the internal temperature sensor A is the temperature S (textile product Until reaching the temperature at which moisture evaporation from the fiber surface is completed, drying is performed under drying conditions in which the heater outlet temperature is a predetermined temperature Q higher than the conventional appropriate drying temperature P. At the same time that the internal temperature of the product reaches the temperature S input in advance into the setting device C, the outlet temperature of the heater decreases to the conventional appropriate temperature P for drying, and drying can be continued. .
Other control methods are the same as conventional ones, and explanations of the configuration and operation will be omitted. As described above, according to the above drying device, drying is performed at a temperature Q higher than the conventional appropriate drying temperature P until the moisture evaporation from the fiber surface of the textile product 5 is completed. The time required to reach the evaporation completion state can be significantly shortened. Then, the point at which this state is reached is detected by the temperature change inside the fibers of the package, and after the moisture evaporation inside is completed, the heating temperature is immediately lowered to the conventional appropriate drying temperature P. Drying is carried out under the same conditions as before, so there is no damage to the fibers. Next, each of the cotton yarn and wool yarn was dried according to the above method and a conventional method. The drying conditions and required time are as shown in Tables 1 and 2 below. In addition, we unwound the yarn of the obtained package product and evaluated its quality.
The results are also shown. <When using cotton thread> Thread type 100% cotton Thickness 30/1 Thread amount 158Kg

【table】 <When using wool yarn> Thread type: 100% wool Thickness 52/2 Thread amount 166Kg

〔Effect of the invention〕

As described above, according to the method for drying packaged textile products of the present invention, it is possible to significantly shorten the drying time, which has been considered difficult in the past, without causing damage to the textile products such as discoloration or poor yarn handling. I can do it.
Further, according to the drying device of the present invention, the above method can be easily carried out by simply making improvements to the conventional drying device.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the drying apparatus of the present invention, Fig. 2 is a detailed explanatory diagram of the manner in which the internal temperature sensor used in the above embodiment is attached, and Fig. 3 is a diagram showing the control panel used in the above embodiment. 4 is a diagram showing the temperature change of each part as the process of the above embodiment progresses; FIG. 5 is a block diagram showing an example of a conventional drying device; and FIG. 6 is a diagram showing the process of the above conventional example. FIG. 3 is a diagram showing temperature changes in each part as the process progresses. DESCRIPTION OF SYMBOLS 1...Blower, 2...Heater, 3...Drying pot, 4...Cooler, 5...Textile product, 10...Control panel, 11...Heating control means, 12...Instruction means, A, X...Temperature sensor, C, D ...Setting device.

Claims (1)

[Scope of Claims] 1. Hot air that circulates through a circulation channel from an air blower through a heater, a drying pot, a cooler, and then back to the air blower,
In the method of drying the packaged textile product loaded in the drying kettle while passing it from the inside of the package to the outside, the point at which water evaporation from the fiber surface of the packaged textile product is completed is
The internal temperature of the packaged textile product is read by a temperature sensor that reads over time, and the temperature of the hot air is set higher than the appropriate drying temperature for the textile product until the moisture evaporation is completed. A method for drying a packaged textile product, characterized in that the temperature of the hot air is lowered to an appropriate temperature for drying the textile product as soon as the drying process reaches the point of completion. 2. Hot air circulates through a circulation path from the blower through the heater, drying pot, cooler, and back to the blower.
The apparatus for drying the packaged textile product loaded in the drying pot while passing the packaged textile product from the inside of the package to the outside includes an internal temperature sensor A that reads the internal temperature of the packaged textile product over time, and an outlet of the heater. A heater outlet temperature sensor B that reads the hot air temperature on the side over time, a setting device C that inputs in advance the temperature S at which moisture evaporation from the fiber surface of the textile product to be dried is completed, and There is a setting device D into which two types of temperatures, a proper temperature P and a predetermined temperature Q higher than the proper temperature, are input in advance, and a setting device D in which the heater outlet temperature read by the heater outlet temperature sensor B is input.
heating control means for controlling the hot air heating by the heater to match either of the set temperatures P or Q inputted in the setting device C; and an instruction means that compares the temperature from time to time and gives a temperature change instruction to the heating control means when the two match,
The heater outlet temperature is controlled to match a temperature Q higher than the appropriate drying temperature from the start of operation until the internal temperature of the textile product reaches the set temperature S, and at the same time when the temperature reaches the set temperature S, A drying device for packaged textile products, characterized in that the drying temperature is controlled to match a suitable drying temperature P.