KR100237100B1 - Ventilation apparatus for treatment of flat material - Google Patents

Abstract

In a ventilator, for example a drying chamber for thermoplastic thin sheet material, a number of blowers used per drying chamber may reduce ineffective drying or other treatments may be performed, such as constant exhaust of the gaseous medium delivered to the material. . For this purpose, a single blower 2 is arranged in the center on the upper wall of the drying chamber 1 and is disposed in the resupply area of the slot nozzles 32, 34 by the duct system 40. , 44).

Description

Aerators for processing flat materials

1 is a cross sectional view from the front of an embodiment on a plane (FIG. 3) of a drying chamber with a ventilator arranged centrally;

FIG. 2 is a cross sectional view from one side on plane C-C in FIG. 1;

3 is a sectional view from above on plane A-A of FIG.

4 is a sectional view from above on plane E-E of FIG.

5 is a sectional view from above on two planes indicated by the B-B line of FIG.

* Explanation of symbols for main parts of the drawings

1: drying chamber 2: ventilation device

3: housing 6: fan

7: heater 10,11: air mixing chamber

32,33,32,35: nozzle set 42,44: suction duct

The present invention relates to a ventilating treatment of planar material for moving and discharging a flowing gas medium (eg air) by means of a distribution duct in a circulation process transverse to the direction of movement of the material, such as thermoplastic foil in the form of a strip. It relates to a ventilation apparatus. Such a device has a closed good thermally insulating housing having inlets and outlets for flat material, nozzles extending above and below the material width above and below the material transverse to the direction of strip movement, in turn in the direction of movement. And is connected to a blower for moving and discharging the gas medium.

Strips of thermoplastic material foil are known to be stretched or fixed in the process chamber immediately after extrusion calendering or molding to improve certain physical properties. The strip may also be coated with a fluid medium and dried in a drying chamber.

The strip is, for example, heat treated in a known process chamber where a temperature controlled gas medium, preferably air, exits through the plurality of slotted nozzles in the process chamber. The slot forming nozzles extend transverse to the direction of movement of the strip in the processing chamber and protrude the entire strip onto one or both surfaces toward the strip surface. In order to avoid heat loss as much as possible, this process chamber is of closed construction. Thus, apart from the material inlet and outlet slots, all parts are hermetically sealed to the outside.

Drying chambers with blower nozzle arrangements for strip materials and the like are disclosed in US-A-4170075. In such well-known drying chambers, the blower nozzles are disposed transversely to the direction of mutual movement as well as up and down of the strip material and extend beyond the width of the strip. The gas medium is located on one of the longitudinal axes of the drying chamber on the inner wall and on the inner wall by means of a vertically extending duct which forms a device with distribution ducts arranged above and below the blower nozzle at right angles to the longitudinal axis of the blower nozzle. In each case installed underneath, it is supplied to the blower nozzle by one vent or blower.

However, no clear discharge process for the feed gas medium has been proposed in this regard. Therefore, the gas medium can be moved from one drying chamber to another, air congestion can be generated in the foil area as a result of different temperature stagnation times, so that streaks can appear in the strip material foil, and finally the gas medium moved in the circulation process. It may also lead to heat loss due to the temperature difference of. Another disadvantage of known drying chambers is the fact that at least two ventilation units per multiple drying chamber must be used to feed the gas medium to the blower nozzle and the strip material foil via the duct system.

Therefore, the ventilation device of the present invention aims to maintain effective drying and to achieve a definite drawing-off of the gas medium supplied to the material while reducing the number of ventilation devices or blowers used in each drying chamber.

According to the present invention, there is provided a ventilator for planar material processing, wherein the flow gas medium is moved and discharged transversely with respect to the direction of movement of the planar material by means of a distribution duct in a circulation process, the apparatus for inlet and outlet for planar material Having a closed housing disposed above and below the planar material and having a nozzle installed transverse to the direction of movement, the nozzle extending beyond the width of the material and continuously disposed in the direction of movement of the gas Connected to a single blower for moving and discharging the medium, the single blower being in the form of a ventilator having at least one pressure chamber and one suction chamber which in each case are separated from each other for the gaseous medium and disposed on the housing ; On either side of the ventilator parallel to the transverse axis of the housing there is a respective air mixing chamber providing a connection with the nozzle via a distribution duct in the housing; At the nozzle side facing the nozzle opening, a horizontally extending suction duct with a suction nozzle is arranged, each suction duct being connected to the suction chamber of the ventilation duct by a return supply duct and each duct in the housing.

An advantage of the device of the present invention is that the gas medium cannot be moved from one zone to another as the gas medium is discharged in a certain way. Thus, even at different temperatures, any temperature difference on the blower side due to the backflow of the gas is simultaneously eliminated. A further advantage is that only one ventilator or blower is used in each drying room as a central blower as compared to the prior art, in which the central blower can be steam, oil or electricity used as heating medium and additionally direct Or indirect gas heating is also possible.

Referring to the drawings, there is shown a drying chamber 1 (FIG. 1) of a dryer, in which a plurality are connected to one another in succession.

The blower 2 in FIG. 1 has a housing 3 in which each compartment 5 is arranged and is arranged on the upper side of the drying chamber 1. The fan 6 is arranged in the compartment 4, and the heater 7 (for example a gas burner) is arranged in the suction chamber 5 which is a compartment of the ventilation device. In the present invention, the gas medium which is air is heated in the blower (2). Referring to FIG. 3, the heated air is sucked by the fan 6, which is a radial blower, for example, and the air mixing of the blower 2 via the static air mixing members 8, 9 in the side region. It is blown into the yarns 10 and 11. The heated air is then introduced into the distributor ducts 18, 19, 20, 21 extending parallel to the central vertical plane 16 of the drying chamber 1 under the upper insulating wall 17 as shown in FIG. 3. From there it is guided to the vertically extending distributor ducts 24, 25, 26, 27 of the duct guide regions 22, 23 of the drying chamber 1. Directing air to the distributor ducts 28, 29, 30, 31: 1st and 5th of the slotted nozzle sets 32, 33, 34, 34: 1st, 2nd and 5th. In front of the vertical distributor ducts 24, 25, 26, 27, static mixers 36, 37, 38, 39: FIGS. 1 and 2 which improve the temperature uniformity are arranged one by one in each case. The temperature regulated air is introduced into the upper and lower distributor ducts 28, 29, 30, and 31 by the vertical distributor ducts 24, 25, 26, and 27 (FIG. 3), from which air is introduced into the nozzle set ( 32, 33, 34, 35 (FIG. 2) are introduced into the planar material 40 to be treated, which may be integrally a thermoplastic foil. Since the nozzle sets 32, 33, 34, 35 are connected to either side of the drying chamber axis by the distributor ducts 28, 29, 30, 31, the pressure is equalized at the individual nozzles of the nozzle set, thereby making the material 40 A uniform release rate is obtained over the full width of the. Return air from the lower nozzle set 32,33 and upper nozzle set 34,35 regions passes through the intermediate spaces between the nozzles and directly to the nozzles (shown in FIG. 1) directly up and down towards the bottom and top, respectively. Air flows into the inlet ducts 41, 42, 43, 44 respectively disposed, and an air velocity of less than 1 meter per minute is obtained by open cross-section between the nozzles. The lower suction ducts 42, 44 are formed by the upper nozzle set 34 by the ducts 45, 46, 47, 48 (shown in FIGS. 1 and 3) disposed perpendicular to the corner region of the drying chamber 1. 35) is connected to the return flow zone. Return air sucked in through the upper and lower suction ducts 41, 42, 43, 44 is taken from the central return transfer duct 49 (shown in FIGS. 1 and 3) extending under the upper insulating wall 17. Guided to the blower 2 and from there it is fed back to the suction chamber 5 in the circuit by the fan 6.

In the manufacture of high grade foils such as polyester foils and polypropylene capacitor foils, air filters should be used to ensure that the air acting on the foil is free of dust.

For this purpose, the upper horizontal distributor ducts 18, 19, 20, 21 (shown in FIG. 3) are provided with one filter set (not shown) in each case to ensure sufficient filtration. In this case, the air is guided through the filter set to four distributor ducts 18, 19, 20, 21, whereby static mixers 36, 37, 38, 39: mixer 38 are not shown. Guided to vertical distributor ducts 24, 25, 26, 27.

Therefore, the drying apparatus is manufactured by the above-mentioned method. In free section the lower drying chamber base 52 (shown in FIG. 1) and the outer wall 50, 51 shown in FIG. 1, 14, 15: FIG. 3 connected to the upper insulating wall 17 are: It consists of a drying chamber 1. Many of these drying chambers are continuously arranged and connected to each other in a manner that is isolated from each other in terms of air conditioning technology, to form drying apparatus suitable for, for example, thermoplastic foils.

Inside the foil guiding zone 53 (Fig. 1) there are six and four individual nozzles in each case, depending on the zone length, with fixed or adjustable nozzle gaps on both sides with respect to the longitudinal and horizontal axes of the drying chamber. There are two sets of upper nozzles and two sets of lower nozzles being mixed and defined by the first and second partition plates 54, 55 (FIG. 3). As shown in FIGS. 1 and 5, the individual nozzles are assembled with distributor ducts 28, 29, 30, 31 extending horizontally one to the right and one to the left to form a nozzle set. have. The pressure between the two air supply zones is equalized through the distributor ducts 28, 29, 30 and 31, resulting in a fairly constant air pressure.

Two upper nozzle sets 32, 33 (FIG. 2) are disposed inside the drying chamber 1 above the foil surface 40 with respect to the space in the center between the sets for maintaining and inspecting the foil movable area, said space Foil residue is removed via

Two lower nozzle sets 32 and 33 are arranged below the foil surface 40. Vertical distributor ducts 24, 25, 26, 27 (FIG. 3) inside the duct guide regions 22, 23 direct the heated air to the upper and lower nozzle sets, and the upper nozzle sets 34, 35 as double ducts. ), Both sets of top and bottom can be supplied with hot air via a duct guide system. In the air supply area for the upper set 34,35 there is an air regulating flap 56,57 (FIG. 1) to adjust the pressure between the upper and lower nozzle sets and for return air to obtain an optimum constant pressure. Vertical ducts 45, 46, 47, 48 (first and third degrees) extend in the corner region of the drying chamber 1. In the lower region of the drying chamber 1 (FIG. 4), the angular contact portions 58, 59 are provided with ducts 46, 46, 47, in the suction nozzles 41, 42, 43, 44 (FIGS. 1 and 4). 48). In the upper region the ducts 45, 46, 47, 48 are connected to the central return supply duct 49 which extends below the upper insulation wall 17 by the intermediate Y-shaped portions 60, 61 (FIG. 3), respectively. do. In addition, the central return supply duct 49 disposed in the center of the insulating wall 17 below the blower 2 and having an air filter 62 (according to the heating method) is recessed in the suction chamber 5 of the blower 2 by a recess. )

In each case, two horizontal upper suction ducts 41 and 43 and two horizontal lower suction ducts 42 and 44 are disposed at the top and bottom of the nozzle set, respectively, and are formed by circular hole or slotted nozzles. Covers a substantial portion of the nozzle set with (63) to allow for the absorption of the return air flow between the individual slot-forming nozzles (FIG. 4) and to ensure complete and simultaneous discharge of the return air flowing through the nozzle set. do.

Claims (10)

A venting device for planar material processing in which a flowing gas medium is moved and discharged transversely with respect to the direction of movement of material through a distributor duct in a circulation process, the apparatus being arranged above and below a flat material and the direction of movement A closed housing having a nozzle disposed transversely with respect to the inlet and outlet for the planar material, the nozzle extending beyond the width of the material and continuously disposed in the direction of movement and moving and discharging the gas medium. Connected to the blower, the single blower is arranged in a housing, in each case in the form of a ventilator comprising at least one pressure chamber and a suction chamber which are separated from each other for the gas medium, the ventilator being parallel to the transverse axis of the housing On either side of the individual air via the distributor duct of the housing to provide a connection to the nozzle There is a mixing chamber, on the nozzle side opposite the nozzle openings, a horizontally extending suction duct, which is connected to the suction chamber of the ventilator by means of a return feed duct and a split duct of the housing, respectively, and equipped with a suction nozzle. A ventilation device for processing flat materials, characterized in that. The ventilating device of claim 1, wherein the housing is heat-insulated. 3. The ventilation device of claim 1 or 2, wherein the nozzle is a slotted nozzle and is combined to form a slotted nozzle set. 2. The ventilation device of claim 1, wherein the housing constitutes a drying chamber for flat strip material, and a single blower is disposed at the center of the top of the drying chamber. The ventilation device of claim 1, wherein the return movement duct is disposed at the center of the housing. 3. The ventilation apparatus for processing planar materials according to claim 2, wherein the suction duct of the slotted lower nozzle set and the suction duct of the slotted upper nozzle set are guided to the central return movement duct via the split duct. 7. The ventilation device of claim 6, wherein a horizontally disposed suction duct is connected to the split duct, the split duct being disposed perpendicularly to an edge region of the housing by an angled connecting piece. 2. The ventilation device of claim 1, wherein the horizontally arranged suction duct is connected to the return movement duct by a connecting piece. 2. The ventilation device of claim 1, wherein the return movement duct is disposed at the center and below the upper insulating wall of the housing and extends in the transverse direction of the housing. 7. The ventilation device of claim 6, wherein the free end of the center return movement duct is connected to the free end of the split duct by a Y-shaped intermediate piece.