HU198330B - Rotary-drum dryer and method for drying particularly water-absorbing synthetic fibres - Google Patents

Abstract

In a method for the widespread growing of maize and of sorghum for the production of fodder to be ensilaged, the sorghum is sown, in each row, above the maize. Conveniently a headless variety of sorghum is used. The sowing density of the maize is between 50,000 and 60,000 plants/ha, that of the sorghum being between 200,000 and 220,000 plants/ha. Sowing and harvesting are determined, respectively, by the heat requirements of the sorghum and by the water content of the maize. Advantageously, the sorghum remaining in the stubble after the harvest may grow to give a secondary harvest.

Description

BACKGROUND OF THE INVENTION The present invention relates to a rotary drum dryer, particularly for drying absorbent filaments, comprising a double-walled, insulated, rotary drum, motor, gear, float rings, frame, bearing housed in a frame, and a rotary drum with a filler orifice.

The present invention also relates to a process for the cyclic drying of absorbent synthetic fibers, in particular cut plastic fibers, preferably below 5% moisture content. Most of the raw materials used in plastic processing absorb moisture in the air, which causes difficulty and quality degradation in thermal processes. The uptake of air humidity and the associated problems are more pronounced for high absorbency, high surface area, and relatively low specific weight cut plastic fibers. The moisture uptake of these fibers can be so high that it is impossible to process them by methods known to date.

Manufacturers of cut plastic fibers are therefore carefully wrapped, for example. The raw material is delivered in a linen cloth bag lined with double-stitched mouthpiece polyethylene foil. However, the fibers often have a moisture content of more than 10%. although the quality of leatherette processing without quality defects requires a moisture content of less than 1.5%.

So far only the powders, e.g. Industrial equipment and processes for drying ground peppers are known. However, due to the static charge and the risk of dust explosion, they are practically barely usable. It is especially dangerous for dried synthetic cut synthetic fibers to enter the environment or the mucous membranes of the operating personnel.

It is an object of the present invention to provide an apparatus in which cut, absorbent, synthetic fibers can be economically dried without the risk of deterioration, dust explosion, environmental pollution and health damage, and the fibers achieve a moisture content of less than 5% during the drying process.

The inventive idea is based on the discovery that synthetic fibers can be dried economically without the risk of boiling and good heat transfer, by rotary drum vacuum evacuation and without the risk of dust explosion due to lack of oxygen.

The rotary drum drying apparatus of the present invention, in particular for the drying of absorbent synthetic fibers, comprising a double-walled, insulated, rotary drum, motor, gear, slide rings, frame, bearing housed in the frame, and a rotary drum is provided with a filler orifice equipped with an outlet head, a manifold tube, an air equalization valve, preferably a filter, a condensate collecting tank and a vacuum pump, the rotary drum has a hot-air inlet and outlet manifold, the driven manifold and the outlet manifold f to the feed head, while our outlet tube is fitted to the outlet head by means of sliding sleeves, the feed head and outlet lees are preferably secured by brackets by means of a flexible connection, and it connects to the vacuum pump by intact manifold, through the outlet head, and through the filter, by inserting an air balancing valve, a condensate collection tank, and a water cooler and condensate separator.

A further feature of the invention may be that a butterfly valve and a heat sink are fitted to the inside of the filler outlet, and the outside of the filler orifice is provided with a clamp for securing a bag mouth.

It has a fan for circulating air, the fan outlet is connected to the feed head by inserting a heat sensor, heat exchanger, pressure line and a flexible connection, and the a-fan suction port is connected to the outlet head.

In one embodiment, the conduit extends into the interior of the drum by means of a sliding fit ring, with a lid - The frame is fixed to the platform and the brackets are attached to the frame. The vacuum pump is connected to a ventilated chimney.

In one embodiment, the condensate collection tank comprises a level indicator and a drain tap. The drum is equipped with a thermometer.

The process according to the invention is based on the cyclic drying of absorbent synthetic fibers, in particular cut plastic fibers, preferably to a moisture content of less than 5%, by filling the fibers in a double-walled rotary drum under closed conditions while ventilating the interior of the rotary drum. then rotate and heat the hot air in the double wall to at least 100 ° C, evaporate, stop and evacuate.

A further feature of the process of the invention. so that the vapor that is discharged during the defrosting is extracted and cooled. condensed, filtered and released. and check the amount of condensate. Prior to loading the fibers, the filler / drain opening of the rotating drum is lowered, the mouth of the bag containing the fibers is fixed to the filling / discharge opening, the filling / discharge opening is raised and the butterfly valve in the rotating drum is opened.

After the fibers are filled, the drainage equalization valve and butterfly valve are closed, the bag is removed, and a heat sealing disc is placed in the filler / drain opening. The spinning air temperature is automatically controlled and controlled.

In one embodiment, prior to emptying the dried fibers, the thermal insulating disk is removed, a laminated bag is placed in a lower position on the filler outlet, and the butterfly valve and air expansion valve are opened.

The apparatus and method according to the invention have several advantages. The equipment is environmentally friendly, is well maintained, prevents dust explosion, and has a low investment cost. The procedure does not cause any harm to health. The use of the present invention makes it possible to produce economically flawless finished products from cut synthetic fibers, e.g. make artificial leather.

The invention will now be described in more detail with reference to the drawings. The attached drawing shows

Figure 1 is a schematic diagram of a rotary dryer.

Fig. 1 shows a rotating drum 2 having a double wall 2a, a driven stub 2b, an outlet stub 2c and an interior space 2d. The driven nozzle 2b and the outlet nozzle 2c are capable of transmitting spinning air, and both of the rotating drum 2 are two to two.

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4th

is connected between the walls. The driven stub 2b is fitted to the feed head 18 and the outlet stub 20 to the outlet head 17 by means of sliding rings 19a, 19b. The feed head 18 and the outlet head 17 are fastened to the brackets 23a, 23b by an elastic connection 21, 22.

The heat-driven rotating drum 2 is rotated by the motor 1 by means of the gearbox la, the rotary drum 2 being supported by the bearings 25 on the frame 23. The frame 23 is attached to the platform 6 and the brackets 23a, 23b are attached to the frame 23. The rotary drum 2 is provided with a thermometer 29. The butterfly valve 4 and the thermal insulating disk 3a are fitted to the inner side of the filling-emptying opening 3. The outside of the filler outlet 3 is provided with a clamp 3b for securing the bag mouth.

The conduit 10 passes through the interior 2d through the outlet 2c, through the gasket 20, the outlet 17, and the filter 12 through the air balancing valve 5, the condensate drain tank 15, the water cooler 14, the Dutch nut 24 and the condensate separator 13. with a vacuum pump. The conduit 10 extends into the interior space * 2d by means of the sliding fit ring 30 and the lid 10a is provided at the end. The vacuum pump 13 is connected to the vent chimney 16. The condensate collection tank 15 is provided with a level indicator 15a and a drain tap 15b.

The hot air circulation fan 7 -> is connected to the inlet head 18 by inserting a pressure nozzle 7a, a heat sensor 8, a heat exchanger 9, a pressure pipe 27 and a flexible connection 28, and a suction nozzle 7b with the outlet head 17 is connected by wire.

In the first step of the drying cycle, the filler / drain opening 3 of the rotating drum 2 is lowered, the mouth of the bag containing the cut plastic fibers is clamped to the filler / drainage opening 3, the filler / bottle 3 is raised the butterfly valves 4 are opened. Thereafter, the evacuation air equalization valve 5 and the butterfly valve 4 are closed, the bag is removed, and the heat insulating disc 3a is inserted into the filler and drain opening 3.

The rotating drum 2 is rotated at 4 rpm and the air in the double wall 2a is heated by circulating air at 140 ° C. The resulting steam is aspirated under vacuum at 4,000 Pa, cooled, condensed, filtered and released while controlling the amount of condensate. In one example, the hot air temperature is automatically controlled and controlled. After the steaming, the rotating drum 2 is stopped.

Thereafter, the thermal insulating disk 3a is removed, a laminated bag is placed in the lower position of the filler drain outlet 3, and the butterfly valve 4 and the air equalization valve 5 are opened. Finally, the filled bag is sealed.

The invention is particularly suitable for drying synthetic, absorbent fibers. Its use is justified especially in the synthetic leather industry.

Claims (13)

PATENT CLAIMS A rotary drum dryer, in particular for drying synthetic absorbent fibers, comprising a double-walled, insulated, rotary drum, motor, gear, slip rings, frame, a bearing housed in a frame, and a rotary drum having a filling head (18), having an outlet head (171 with a conduit 10), an air-balancing valve (5), preferably a filter (12), a condensate collecting tank (15) and a vacuum pump (13), a hot-air nozzle (2b) and has a stub (2c), the driven stub (2b) and the outlet stub (2c) being connected between the double wall (2a) of the rotating drum (2), the steered stump (2b) being connected to the feed head (18) and the outlet stub (18). 2c) is fitted to the outlet head (17) by means of sliding rings (19a, 19b), the feed head (18) and the outlet head (17) preferably being provided with a flexible connection (21, 22); secured to the onols (23a, 23b) and the humidifier tube (10) through the inner space (2d) of the rotating drum (2) through the outlet nozzle (2c), the outlet head (17) and the filter (12) through the air balancing valve (10). 5), connecting the condensate collection tank (15) and the water cooler (14) and the condensate separator (11) to the vacuum pump (13). Apparatus according to claim 1, characterized in that a butterfly valve (4) and a heat-insulating disc (3a) are fitted to the inner side of the filling-emptying opening (3) and the outer side of the filling-emptying opening (3) equipped with a .cuff (3b) suitable for attaching a cod-mouth. Apparatus according to claim 1 or 2, characterized in that it has a fan (7) for circulating spinning air, a discharge nozzle (7a) of the fan (7) with a heat sensor (8), a heat exchanger (9). , connected by a pressure conduit (27) and a flexible connection (28), and the suction nozzle (7b) of the fan (7) is connected to the outlet (17). 4. Apparatus according to any one of claims 1 to 4. characterized in that the conduit (10) is inserted into the inner space (2d) of the drum (2) by means of a sliding fit ring (30) and has a lid (10a). 5. Device according to any one of claims 1 to 3, characterized in that the frame (23) is attached to the platform (6) and the brackets (23a, 23b) are attached to the frame (23). 6. Apparatus according to any one of claims 1 to 3, characterized in that the vacuum pump (13) is connected to a ventilating chimney (16). 7. Apparatus according to any one of claims 1 to 4. characterized in that the rotating drum (2) is provided with a thermometer (29). A method for cyclically drying absorbent synthetic fibers, in particular cut plastic fibers, preferably to a moisture content of less than 5%, characterized in that the fibers are filled under closed conditions into a double-walled rotary drum (2) while ventilating the inner space (2d) of the rotary drum (2). , the rotary drum (2) is then closed and then rotated, and hot air is circulated in the double wall (2a) to at least 100 ° C, evaporated, stopped and evacuated. 10. The method of claim 9, wherein the steam evacuated during desulphurisation is aspirated, cooled, condensed, filtered and 198,330 are released and the amount of condensate is checked. Method according to claim 9 or 10, characterized in that, prior to loading the fibers, the filler / drain opening (3) of the rotating drum (2) is lowered and the mouth of the bag containing the fibers is fixed to the filler / drain hole (3). , move the filling-discharge opening (3) to the upper position and open the butterfly valve (4) in the rotating drum (2). Method according to any one of claims 9 to 11, characterized in that, after filling the fibers, an emptying air balancing valve (5) and a butterfly valve (4) are carried out, the bag is removed and a heat insulator is inserted into the filling discharge port (3). a disk (3a) is inserted. 5 13. A 9-12. A method according to any one of claims 1 to 3, characterized in that the temperature of the spinning air is preferably automatically controlled and controlled. 14. A 9-13. A method according to any one of claims 1 to 3, characterized in that, before emptying the dried 'U fibers, the thermal insulating disk (3a) is removed, a laminated bag, a butterfly valve (4) and an air equalization valve (5) are placed in the lower position. and we open it.