JPH073310B2 - Method and apparatus for drying fiber packages - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for efficiently drying a fiber package by circulating hot air under pressure.

[Prior art]

Conventionally, in this type of dryer, the water contained in the circulating heating air for raising the temperature of the fiber itself and evaporating the water contained in the fiber is condensed into a condensate by a cooler and then condensed by a condensate separator. After discharging the liquid, the circulating air was heated again by the heater.

[Problems to be Solved by the Invention]

As described above, in the conventional technique, a large amount of cooling water and steam are consumed, and depending on the fiber material, the amount of separated condensate is large and a long drying time is required.

Therefore, the present invention intends to provide a highly productive apparatus which significantly reduces the consumption of steam and cooling water and shortens the drying time.

[Means for Solving the Problems]

In view of the above, the present invention is directed to a first invention in which hot air is circulated under pressure by adding compressed air to a circulation circuit including a fan, a heater, a drying tank, a cooler, a condensate separator, and a fan. In the one in which the fiber package is dried by the above, in the first circulation circuit passing through the condensate separator,
Blower → Heater → Drying tank → Cooler → Package tank →
By providing a second circulation circuit including a path of a blower, the first circulation circuit is provided.
The circulation circuit and the second circulation circuit are alternately switched to operate, and the package tank is loaded with a fiber package having a low moisture content, and the fiber package is separated from the fiber package in the drying tank. To operate the second circulation circuit until the moisture absorption rate of the fiber package reaches the limit moisture absorption rate, and then switch to the first circulation circuit to save the amount of cooling water used for the cooler. A second aspect of the present invention is a fiber package drying method, wherein compressed air is added to a circulation circuit on the condensate separator side of the blower → heater → drying tank → cooler → condensate separator → blower. In the case where the fiber package is dried by hot air circulating under pressure, the first circulation circuit passing through the condensate separator is blower → heater → drying tank → cooler → fiber. A second circulation circuit comprising a circulation path from the fiber package tank to the blower is provided in parallel, and a switching valve (11) is provided between the condensate separator and the outlet side of the cooler in the first circulation circuit. A switching valve (9) is provided upstream of the switching valve (11) between the package tank (12) and the outlet side of the cooler in the second circulation circuit, and further, the outlet side of the package tank and the blower are provided. A fiber package drying device, characterized in that a switching valve (10) is inserted between the two.

[Action]

By using the second circulation path of the heated air through the package tank, the moisture content of the air exiting the drying tank is such that the fiber package (14) in the package tank (12) has a low moisture content of about 50 ° C or less. When the temperature is high, it is sucked up by the fiber package without using a cooler, and the condensate can be efficiently separated.

Depending on the material to be dried, the fiber package (14) in the package tank (12) can be replaced multiple times during the drying process.

〔Example〕

 Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention.
Is a drying tank, 2 is an opening / closing lid, 3 is a fiber package loaded in the drying tank, 4 is a carrier, 5 is a cooler, and 6 is a heater. The air sent from the blower 7 enters the heater 6, is controlled to a constant temperature by the temperature controller TC, and is then sent to the drying tank 1 via the switching valve 18. The switching valve 18 is an air cylinder
19 for the dry fiber package 3 in the drying tank 1
The air flow can be switched from ON to OUT and OUT to IN.

8 is a condensing separator, and 9, 10 and 11 are switching valves.

During the initial dehydration process, the air that has exited the cooler 5 by closing the switching valves 9 and 10 is sent to the condensing separator 8, where the water contained in the cooled air is separated. The condensing separator 8 has a drain valve 17. 12 is a package tank, 13 is an opening / closing lid, 14 is a fiber package loaded in the package tank, and 15 is a carrier. The package tank 12 has a drain valve 16. When the initial dehydration process is completed, the switching valves 9 and 10 are opened, and the switching valve 11 is closed to let the air flow to the package tank.
When it is sent to 12, the dry fiber package in the package tank 12 absorbs the moisture contained in the air flow in a short time. In this case, the cooler 5 does not work. Since the moisture absorbing action of the fiber package differs depending on the material of the fiber package 14, it is usually preferable that the fiber packages 3 and 14 are made of the same material. When the limit moisture absorption rate of the fiber package 14 is reached, the switching valve 11 is opened, the switching valves 9 and 10 are closed, and the flow of air is switched to continue the drying process.

In this state, the internal pressure of the package tank 12 is released to the atmosphere by a pressure release device (not shown) and the opening / closing lid 13 is opened to absorb the moisture.
From the carrier 15 together with the carrier 15 and replace it again with the dry fiber package 14 before the dyeing process. Package tank 12
, And the same pressure as that of the drying tank 1 is set by a pressurizing device (not shown). Then, the switching valves 9, 10 and 11 serve to absorb water in the circulating air again.

〔The invention's effect〕

According to the present invention, the amount of cooling water used for the cooler (5) can be extremely reduced while the fiber package (14) in the package tank (12) is functioning to absorb water, and a condensation separator is not required. Since the condensate can be separated in a short time, the drying time can be greatly shortened and the productivity can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention. 1 ... Drying tank, 3 ... Fiber package to be dried, 5 ... Cooler, 6 ... Heater, 7 ... Blower, 8 ... Condensate separator, 9, 10, 11 ... Switching valve, 12 ...... Package tank, 14
... Fiber packages

Claims (2)

[Claims] 1. A compressed air is added to a circulation circuit consisting of a blower, a heater, a drying tank, a cooler, a condensate separator, and a blower, so that the fiber package is dried by hot air circulating under pressure. In the above, the first circulation circuit passing through the condensate separator is provided with a second circulation circuit consisting of a fan, a heater, a drying tank, a cooler, a package tank, and a fan, and the first circulation circuit is provided. The circulating circuit and the second circulating circuit are alternately switched and operated, and a fiber package having a low moisture content is loaded in the package tank, and the liquid separated from the fiber package in the drying tank is loaded in the fiber package. The second circulation circuit is operated until the moisture absorption rate reaches the limit moisture absorption rate of the fiber package, and then the first circulation circuit is switched to the cooling water used for the cooler. Fiber package drying method characterized by saving the dose. 2. A blower → heater → drying tank → cooler → condensate separator → compressed air is added to the condensate separator side circulation circuit of the blower to dry the fiber package by hot air circulating under pressure. In such a configuration, in the first circulation circuit passing through the condensate separator, a second circulation circuit including a circulation path of a blower → a heater → a drying tank → a cooler → a fiber package tank → a blower is arranged in parallel. A switching valve (11) is provided between the condensate separator in the first circulation circuit and the outlet side of the cooler, and is provided between the package tank (12) and the outlet side of the cooler in the second circulation circuit. A changeover valve (9) is provided at a position upstream of the changeover valve (11), and a changeover valve (10) is inserted between the outlet side of the package tank and the blower. Drying device.