Nozzle box device and stretching unit

Abstract

The invention relates to a nozzle box device (16) for an oven (12) of a stretching unit (10), comprising a nozzle box (18) and a support device (34) for the nozzle box (18). The support arrangement (34) comprises a first support (52) and a second support (54). The first support (52) is designed to be height-adjustable in such a way that the nozzle box (18) can be adjusted between an operating position and an assembly position, the first end of the nozzle box (18) being positioned lower in the assembly position than in the operating position. The invention further relates to a stretching unit (10).

Description

Technical Field

[0001] The invention relates to a nozzle box arrangement for an oven of a stretch unit and a stretch unit comprising an oven. Background Art

[0002] Stretching units are used in particular for the production of plastic films. Usually, in such units, the film to be stretched is moved in the stretching direction through the oven of the stretching unit by means of a film transport system. The film to be stretched is heated before the stretching process and is kept at a predetermined temperature during, during and after the stretching process. Subsequently, the stretched film is cooled in the oven.

[0003] To control the temperature of the oven and the film, a nozzle box is used which extends in the transverse direction along the film and comprises a plurality of outlet openings directed towards the film. Temperature-controlled air is conveyed through the nozzle box, which flows through the outlet openings towards the film and heats or cools the film.

[0004] Such nozzle boxes are usually fixedly mounted on supports above and below the film and are extremely difficult to access. If an oven malfunctions, which means that one of the nozzle boxes needs to be removed, other nozzle boxes must often also be removed in order to reach the required nozzle box. This results in long downtimes of the stretching unit, as the removal of the nozzle boxes from the oven is very time-consuming. Summary of the invention

[0005] It is therefore an object of the present invention to provide a nozzle box arrangement and a stretching unit in which the nozzle box can be mounted and removed more easily.

[0006] The object is achieved by a nozzle box arrangement for an oven of a stretching unit, in particular a transverse direction orienter, a machine direction orienter and / or a synchronous stretching unit, comprising a nozzle box and a support device for the nozzle box. The support device comprises a first support and a second support. The nozzle box is connected to the first support and the second support. The first support is designed to be height-adjustable so that the nozzle box can be adjusted between an operating position and an assembly position, wherein a first end of the nozzle box is positioned lower in the assembly position than in the operating position.

[0007] Due to the height adjustment capability of the first support, the nozzle boxes can be removed individually laterally, i.e. in the transverse direction, in particular along a removal path located below one of the transport tracks of the film transport system. As a result, the nozzle boxes can be quickly removed from the stretching unit and quickly reinstalled for the stretching unit.

[0008] The connection of the nozzle box to the carrier element can also take place indirectly.

[0009] For example, the nozzle box is connected to the first support by a first of its sides and to the second support by a second of its sides, especially with respect to the transverse direction (ie the longitudinal direction of the nozzle box).

[0010] The direct or indirect connection between the nozzle box and the first support can be arranged on the first side at an end face on the first end of the nozzle box, adjacent to the end face, or further offset towards the center.

[0011] The direct or indirect connection between the nozzle box and the second support can be arranged on the second side at an end face on the second end of the nozzle box, adjacent to the end face, or further offset towards the center.

[0012] In one embodiment, the support device comprises a rail on which the nozzle box is mounted, wherein the rail is connected to a first support on a first side and to a second support on a second side, wherein a first end of the rail is positioned lower in the assembly position than in the operating position. In this way, the stability of the nozzle box device is increased.

[0013] It is conceivable that the support device is formed by one or more rails, one or more first supports and one or more second supports and optionally an actuation device.

[0014] For example, the track is connected to the first support by a first of its sides and to the second support by a second of its sides, especially with respect to the transverse direction (i.e. the longitudinal direction of the track). Thus, the first end is located on the first side of the track.

[0015] The direct or indirect connection between the rail and the first support may be arranged on the first side at an end face on the first end of the rail, adjacent to the end face, or further offset towards the centre.

[0016] The direct or indirect connection between the rail and the second support may be arranged on the second side at an end face on the second end of the rail, adjacent to the end face, or further offset towards the centre.

[0017] The connection of the rail to the support may be direct, or may be indirect, for example, via longitudinal supports.

[0018] It is also conceivable that the support device comprises a frame which is directly connected to the support, wherein the rail is attached to the frame.

[0019] The first end and the second end of the nozzle box may be aligned correspondingly with the first end or the second end of the track.

[0020] In one embodiment, the rails and / or the nozzle boxes are arranged horizontally in the operating position, thereby enabling a particularly uniform blowing of the temperature-controlled air onto the membrane.

[0021] During adjustment from the operating position to the assembly position, the rails and / or the nozzle box may be tilted relative to the horizontal plane in order to further simplify removal.

[0022] In an embodiment, the first support comprises two components which are pivotably attached to each other and at least one of the two components is pivotable relative to the rail and / or the nozzle box, in particular wherein, in the operating position, the components stand vertically and are aligned with each other. In this way, a simple and stable first support is provided.

[0023] The two components may be mechanically fixed in position in the operating position.

[0024] To simplify the support arrangement, the second support may be a stationary support and / or the rail and / or the nozzle box, in particular the second side (eg the second end) of the rail and / or the nozzle box may be pivotably attached to the second support.

[0025] A stationary support is understood to mean that the height of the support is not adjustable.Thus, the second support may comprise a vertical member or be a vertical member.

[0026] It is also conceivable that the second support is also designed to be height-adjustable.Compared to the operating position, the two ends of the rail and / or the nozzle box can be positioned lower in the assembly position.

[0027] In an embodiment, the nozzle box is arranged to be slidable on the rail and / or to be removable from the support device via the first end of the rail, thereby further simplifying the removal and installation of the nozzle box.

[0028] In an embodiment, the support device comprises two first supports and one first longitudinal support, wherein the first longitudinal support connects the two first supports to each other, thereby increasing the stability of the support device.

[0029] It is conceivable that the longitudinal supports are connected by one or more transverse supports and together form part of the frame.

[0030] For example, the support device comprises two second supports and one second longitudinal support, wherein the second longitudinal support connects the two second supports to each other, thereby increasing the stability of the support device.

[0031] The rails and / or the nozzle boxes may extend transversely to the first and / or second longitudinal supports and / or be attached to the first and / or second longitudinal supports, thereby further increasing the stability of the support device.

[0032] The rail and / or the nozzle box are attached to the first and second supports, in particular via the first and / or second longitudinal supports.

[0033] The second longitudinal support can comprise a joint with a pivot axis in the tensile direction.As a result, the attachment of the rail and / or the nozzle box takes place pivotably on the second support.

[0034] In an embodiment, the support device comprises a plurality of rails and / or nozzle boxes which are aligned parallel to each other and attached adjacent to each other on the first and / or second longitudinal supports, such that a plurality of nozzle boxes can be accommodated on the support device.

[0035] In order to simplify actuation, the support device may comprise an actuation device, wherein the actuation device is configured to adjust the height of the first support.

[0036] It is conceivable that parts of the actuating device or the entire actuating device are not permanently attached to the remaining support device, but are only mounted as required. This is advantageous because fewer actuating devices are required.

[0037] It is also conceivable that the height adjustment of the support may be power-driven, whereby the actuating device comprises a drive unit, for example an electric motor or the like.

[0038] In one embodiment, the actuating device is a screw jack comprising a threaded spindle and a spindle nut, by means of which the height of the first support can be reliably adjusted.

[0039] For example, the actuating means is arranged on a first side of the supporting means.The spindle nut may be attached to the first longitudinal support.

[0040] In one embodiment, the nozzle box arrangement comprises a plurality of nozzle boxes, in particular wherein the nozzle boxes are aligned parallel to one another and arranged adjacent to one another in the stretching direction. As a result, a plurality of nozzle boxes can be moved simultaneously into the assembly position in order to further reduce the downtime of the stretching unit.

[0041] In particular, each nozzle box is arranged on its own track. For example, four nozzle boxes are arranged on one supporting device.

[0042] A cover independent of the nozzle box can be arranged between two adjacent nozzle boxes and / or the perforated wings protrude on the outlet side of the nozzle box toward the adjacent nozzle box in the stretching direction. The perforated wings as part of the nozzle box further shorten the setting time.

[0043] The cover is for example a perforated cover or a cover without any perforations.

[0044] The outlet side is, for example, the upper side of the nozzle box, ie the side from which the air blows toward the membrane.

[0045] For example, the perforated wings of adjacent nozzle boxes completely cover the gap between the corresponding nozzle boxes and / or abut against each other.

[0046] In one embodiment, the nozzle box comprises a plurality of outflow openings arranged on the outlet side of the nozzle box and / or the nozzle box has an inlet side with an air inlet opening, wherein the inlet side is located on the second side of the nozzle box. In this way, a reliable and uniform air flow onto the membrane can be ensured.

[0047] For example, the nozzle box comprises a base body and an attachment attached to the base body, wherein the attachment comprises an outflow opening. In this way, the nozzle box can have multiple uses.

[0048] The object is also achieved by a stretching unit, in particular a transverse direction orienter, a machine direction orienter and / or a synchronous stretching unit, which stretching unit comprises a film transport system and an oven, which oven comprises the aforementioned nozzle box device, in particular wherein the tracks and / or the nozzle boxes are arranged transversely to the stretching direction.

[0049] The features and advantages described for the support device also apply to the extension unit and vice versa.

[0050] The nozzle box arrangement and the nozzle box are located in particular below the membrane transport system and / or below the membrane.

[0051] The oven and the support device have a stretching direction corresponding to the travel direction of the film during operation of the stretching unit and a transverse direction horizontal and transverse to the stretching direction.

[0052] For example, the first side, second side, first end and second end of the rail and / or the nozzle box are sides and ends in the transverse direction.The first side and first end of the rail and thus the first side of the support device may be located on the so-called assembly side of the stretching unit.

[0053] For example, the oven comprises an oven base to which the support means, in particular the support, is attached.

[0054] The threaded spindle of the actuating device may be pivotably attached to the oven base or other support means.

[0055] In one embodiment, the film transport system comprises two transport tracks arranged in a transverse direction at a distance from each other, wherein the nozzle box in the assembly position of the support device can be removed from the oven along a removal path located below one of the transport tracks, and / or wherein the nozzle box in the operating position of the support device is at least partially arranged within the distance.

[0056] In particular, an outflow opening is arranged on the outlet side of the nozzle box within this distance.

[0057] In an embodiment, the stretching unit comprises an air source, wherein the inlet side of the nozzle box is connected to the air source in the operating position of the support device, such that the nozzle box can be removed from the oven independently of the air source. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Additional advantages and features of the present invention can be found in the following description and in the accompanying drawings to which reference is made. In the drawings:

[0059] Figure 1 A stretching unit according to an embodiment of the present invention is shown in a schematic top view;

[0060] Figure 2 shows a schematic cross-sectional view of a portion of a stretching unit comprising a nozzle box arrangement according to an embodiment of the invention in an operating position;

[0061] Figure 3 Shown according to Figure 2 An enlarged schematic cross-sectional view of two adjacent nozzle boxes of a nozzle box device;

[0062] Figure 4 Shown according to Figure 2 A schematic cross-sectional view of a nozzle box assembly in an assembled position;

[0063] Figure 5 shows a perspective view of a nozzle box arrangement according to a second embodiment of the invention in an assembled position;

[0064] Figure 6 A schematic cross-sectional view of a portion of a stretching unit is shown, the stretching unit comprising a nozzle box arrangement according to a third embodiment of the invention in an operating position. DETAILED DESCRIPTION

[0065] exist Figure 1 In FIG. 1 , a stretching unit 10 according to the invention is shown very schematically.

[0066] In the first embodiment shown, the stretching unit is referred to as a transverse direction orienter (TDO). It is also conceivable that the stretching unit is a machine direction orienter or a synchronous stretching unit.

[0067] The stretching unit 10 comprises an oven 12 , a film transport system 14 and a nozzle box arrangement 16 which comprises at least one nozzle box 18 .

[0068] The oven 12 has a stretching direction R which corresponds to the travel direction of the film to be stretched F. The transverse direction Q of the oven 12 is transverse to the stretching direction R and extends horizontally, and the vertical direction H extends vertically.

[0069] Along the stretching direction R, the oven 12 has different zones for treating the film F to be stretched.

[0070] The film F is heated in a first zone 22 (also called preheating zone). In a subsequent second zone ("stretching zone"), the film F is stretched in the transverse direction Q so that its width is greater at the end of the second zone 24 than at the beginning.

[0071] After the stretching is completed, the film F passes through a third zone 26 (referred to as a "heat treatment zone," "further heating zone," and / or "annealing zone"), in which relaxation of the film F can be performed at an elevated temperature.

[0072] Subsequently, the film F then passes through a fourth region 28 and a fifth region 30 (“cooling region”), wherein the film F is cooled in the fifth region 30 .

[0073] The fourth area 28 is referred to as a neutral area and separates the third area 26 from the fifth area 30. The neutral area is, for example, an empty space without any ventilation.

[0074] The film transport system 14 comprises in a known manner two transport rails 32 which are arranged mirror-symmetrically with respect to a center plane M of the stretching unit 10 or of the oven 12 at a distance therefrom and extend at least partially in the oven 12 .

[0075] The transport tracks 32 extend outside the oven 12 in the entry and exit zones of the stretching unit 10 , where the film F is fed and removed.

[0076] The film F is gripped in a known manner by grippers (not shown) of a film transport system 14 , which are guided along transport tracks 32 , and is transported through the oven 12 along the stretching direction R.

[0077] A plurality of nozzle box devices 16 are arranged in the oven, wherein for the sake of clarity, Figure 1 The nozzle box arrangement 16 is only partially shown in FIG.

[0078] The nozzle box arrangement 16 is used to direct temperature-controlled air onto the membrane F in order to control the temperature of the membrane F, thereby heating or cooling the membrane F.

[0079] Thus, the nozzle box arrangement 16 can be arranged in the first region 22, the second region 24, the third region 26, and for cooling purposes, also in the fifth region 30. Figure 1In the illustration, for the sake of clarity, not all nozzle box arrangements 16 and nozzle boxes 18 of the stretching unit 10 are shown.

[0080] Figure 2 A sectional view of the stretching unit 10 in the region of one of the nozzle box arrangements 16 is shown, wherein only parts of the stretching unit 10 are shown for the sake of clarity.

[0081] Figure 2 The film transport system 14 , more particularly the transport rails 32 , between which the film F extends, and the nozzle box arrangement 16 are shown.

[0082] The nozzle box device 16 includes a support device 34 and a nozzle box 18 attached to the support device 34 .

[0083] Figure 2 Only one support device 34 and one nozzle box 18 can be seen in FIG. However, multiple nozzle boxes 18 can be provided, and multiple support devices 34 can also be provided.

[0084] The nozzle boxes 18 are aligned in the transverse direction Q and are adjacent to one another in the stretching direction R. The nozzle boxes 10 are in particular parallel to one another.

[0085] Each of the nozzle boxes 18 is designed to be hollow in a known manner and comprises an inlet side 36 and an outlet side 38. The outlet side 38 corresponds to the upper side of the nozzle box 18, for example.

[0086] The nozzle box 18 has an air inlet opening 40 on the inlet side 36 , which is connected to an air source 42 of the stretching unit 10 .

[0087] The nozzle box 18 has a plurality of outflow openings 44 facing the membrane F on its outlet side 38 .

[0088] In the transverse direction Q, the nozzle box 18 may include a first side portion and a first end portion (at Figure 2 ) and the second side and the second end (at Figure 2 on the right side of the diagram).

[0089] The first side portion and the second side portion are regions located on different sides of the center of the nozzle box 18 in the transverse direction Q (ie, Figure 2 to the left and right of center).

[0090] The nozzle box 18 may have multiple components and may include a base body 19 and an attachment 20 .

[0091] The attachment 20 is mounted on the upper side of the base body 19 , wherein the outflow opening 44 is provided in the attachment 20 .

[0092] In particular, the base body 19 does not extend into the gap between the two transport rails 32 , but only the attachment 20 extends into the gap between the two transport rails 32 .

[0093] like Figure 2 As indicated by the middle arrows, during operation of the stretching unit 10, temperature-controlled air can flow through the air source 42 and the air inlet opening 40 into the nozzle box 18. The temperature-controlled air is then uniformly delivered to the membrane F through the outflow opening 44, which is thereby heated or cooled.

[0094] The air returning from the membrane F can flow between the nozzle boxes 18. Figure 3 , in which two adjacent nozzle boxes 18 are shown in section along the stretching direction R.

[0095] Adjacent nozzle boxes 18 are arranged at a distance A from one another, so that a gap 48 is formed between them, through which air can flow.

[0096] In the exemplary embodiment shown, two perforation wings 46 are provided on the outlet side 38 of the nozzle box 18 , respectively, which extend, in particular, in the transverse direction Q over the entire length or a partial region of the nozzle box 18 .

[0097] The wing 46 is in particular attached to the attachment 20 .

[0098] The wings 46 extend in opposite directions with respect to the stretching direction R, that is, one wing 46 extends in the stretching direction R, and one wing extends in a direction opposite to the stretching direction R.

[0099] The length of each wing 46 in the stretching direction R and the length of each wing 46 in the direction opposite to the stretching direction are equal to, for example, half of the spacing A between the nozzle boxes 18, so that the mutually facing wings 46 of adjacent nozzle boxes 18 completely cover the gaps 48 between the nozzle boxes 18, wherein some play or assembly clearance may exist between the wings 46. The wings 46 may also abut against each other.

[0100] It is conceivable that the nozzle boxes 18 do not comprise any wings 46, but rather that a separate cover, ie a perforated cover or a non-perforated cover, is provided between the nozzle boxes 18, said cover covering the gap 48. It is also conceivable that the gap 48 remains open and is therefore not covered.

[0101] from Figure 2 It can be seen in FIG. 1 that the nozzle box 18 , more specifically the attachment 18 b , in the operating position projects into the spacing between the transport rails 32 of the film transport system 14 .

[0102] In particular, the outlet side 38 (together with the outflow opening 44 ) is arranged spaced apart between two transport rails 32 , ie in the vertical direction and in the transverse direction Q between the transport rails 32 .

[0103] exist Figure 2 The support device 34 , shown in its operative position, comprises a track 50 , a first support 52 , a second support 54 and an actuating device 56 .

[0104] The rail 50 and the nozzle box 18 extend in a transverse direction Q.

[0105] For example, a separate support device 34 is provided for each nozzle box 18 .

[0106] The nozzle box 18 is arranged slidably on rails 50 of the support device 34 such that the nozzle box 18 can slide along the rails 50 in a transverse direction Q. However, in the operating position, the nozzle box 18 is fixed in position on the rails 50 in order to prevent undesired movements.

[0107] In the embodiment shown, the rails 50 and therefore the nozzle box 18 located thereon are aligned horizontally in the operating position.

[0108] The rail 50 comprises a first side portion with a first end along the transverse direction Q, the first side portion being connected to the first support 52 , and a second side portion with a second end along the transverse direction Q, the second side portion being connected to the second support 54 .

[0109] The first side and the first end of the nozzle box 18 correspond to the first side and the first end of the track 50. Similarly, the second side and the second end of the nozzle box 18 correspond to the second side and the second end of the track 50.

[0110] The air source 42 of the stretching unit 10 is arranged on the second side of the rail 50 and thus on the entire support device 34 ; the inlet side 36 of the nozzle box 18 is also aligned towards the second end of the rail 50 .

[0111] The second end of the rail 50 is pivotably attached to the second support 54 about a pivot axis, wherein the pivot axis extends in the tension direction R.

[0112] The second support 54 is a stationary support, ie, the height of the second support 54 is not adjustable. Therefore, the second support 54 can be regarded as a vertical member.

[0113] For example, the second support 54 is attached to an oven base 58 of the oven 12 .

[0114] It is likewise conceivable that the second support 54 is also designed to be height-adjustable, for example identically to the first support 52. The two ends of the rail 50 are positioned lower in the assembly position than in the operating position.

[0115] However, the first support member 52 is designed to be height-adjustable.

[0116] In the illustrated embodiment, the first support 52 includes a first member 60 and a second member 62 .

[0117] The first member 60 is pivotally attached to the oven base 58 by one of its ends and is pivotally attached to the second member 62 by the other of its ends.

[0118] The second member 62 is connected to the first member 60 at a first end thereof and is pivotably connected to the track 50 at another end.

[0119] The three pivot axes which are pivotably connected are parallel to one another and extend in the stretching direction R.

[0120] from Figure 2 It can be seen in FIG. 1 that the two members 60, 62 stand vertically and are aligned with each other in the operating position of the support device 34. In addition, both members 60, 62 can be mechanically fixed in place to each other in the operating position shown.

[0121] Therefore, the height of the first support 52, that is, the distance between the upper end of the second member 62 and the lower end of the first member 60 is adjustable.

[0122] An actuating device 56 is provided for adjusting the height, which in the embodiment shown is a screw jack comprising a threaded spindle 64 and a spindle nut 66 .

[0123] It is conceivable that parts of the actuating device 56 or the entire actuating device 56 are not permanently attached to the remaining support devices 34 , but are mounted only to the support device 34 to be actuated as required.

[0124] Optionally, the actuating device 56 may include a drive unit 68 , such as an electric motor, for actuating the threaded spindle 64 .

[0125] If a drive unit 68 is provided, it is also possible to use other means than a threaded spindle for adjusting the height.

[0126] A spindle nut 66 is fixedly connected to the first side of the track 50 , and the threaded spindle 64 extends through the spindle nut 66 .

[0127] The threaded spindle 64 is pivotably connected to the oven base 58 , wherein the pivot axis extends in the stretching direction R here as well.

[0128] Thus, by actuating the threaded spindle 64 to raise or lower the spindle nut 66 , the height of the first support 52 is varied.

[0129] from Figure 2 The support device 34 can be moved by the actuating device 56 to the operating position shown. Figure 4 To this end, the threaded spindle 64 is actuated, for example by the drive unit 68, so that the first support 52 is shortened. As a result, the track 50 is pivoted relative to the second support 54 and the first end of the track 50 is lowered. Thus, when changing from the operating position to the assembly position, the track 50 is inclined relative to the horizontal plane.

[0130] In the assembly position, the first end of the rail 50 and therefore of the nozzle box 18 is now significantly lower than it is in the operating position, and in particular lower than the second ends of both the rail 50 and the nozzle box 18 .

[0131] In this assembly position, the nozzle box 18 can now be removed from the support device 34 and the oven 12 .

[0132] For this purpose, the nozzle box 18 is slid out of the rails 50 of the support device 34 beneath the transport rails 32 of the film transport system 14 .

[0133] To simplify this, an auxiliary rail 70 of the extension unit 10 may be attached to the first side of the rail 50 so as to be able to transport the nozzle boxes 18 continuously.

[0134] By lowering the first support, a removal path is thus provided for the nozzle boxes 18 below one of the transport tracks 32 of the film transport system 14 , via which removal path an individual nozzle box 18 can be easily removed from the oven 12 of the stretching unit 10 .

[0135] To insert the nozzle box 18 , the nozzle box 18 is slid onto the rails 50 of the support device 34 on the auxiliary rails 70 and fixed in place on the rails 50 .

[0136] Then, the actuating device 56 is actuated again to increase the height of the first support 52 and thereby raise the first end of the track 50 to the height of the second end of the track 50. Thus, the nozzle box 18 is inserted into the gap between the two transport tracks 32 of the film transport system 14 until the nozzle box 18 reaches the height of the second end of the track 50 again. Figure 2 Operating position shown.

[0137] exist Figure 5 In FIG. 1 , a second embodiment of a support device 34 according to the invention is shown.

[0138] The support device 34 of the second embodiment corresponds substantially to the first embodiment, so that only the differences are discussed below. Identical and functionally equivalent parts have the same reference numerals.

[0139] exist Figure 5 , the support device 34 is shown in the assembled position. The support device 34 of the second embodiment differs from the support device 34 of the first embodiment in that the support device 34 is provided for a plurality of nozzle boxes 18 at the same time and therefore comprises a plurality of rails 50.

[0140] There are as many rails 50 as there are nozzle boxes 18 which the support device 34 is intended to receive; in the embodiment shown, four rails 50 and four nozzle boxes 18 are provided.

[0141] The support device 34 of the second embodiment comprises two first supports 52 connected to each other by means of a first longitudinal support 72 .

[0142] The first side of the track 50 is attached to the first longitudinal support 72. In particular, the first end of the track 50 rests on the first longitudinal support 72.

[0143] Furthermore, the bearing device 34 has two second bearing elements 54 and may have a second longitudinal support element 74 which connects the two second bearing elements 54 to one another.

[0144] For example, the second end of the track 50 may be pivotally attached to the second longitudinal support 74 .

[0145] The first longitudinal support 72 and the second longitudinal support 74 extend in the tensile direction R, and the rail 50 extends transversely to the longitudinal supports 72 , 74 .

[0146] It is conceivable that at least one, for example two, transverse support members are additionally provided (in Figure 5 ), the transverse support members connect the longitudinal support members 72, 74. Thus, the support device 34 can have a frame including the longitudinal support members 72, 74 and the at least one transverse support member.

[0147] The spindle nut 66 of the actuating device 56 is arranged on the first longitudinal support 72 , in particular at the center of the first longitudinal support 72 with respect to the stretching direction R.

[0148] It is also conceivable that in this embodiment the actuating device 56 is not permanent, ie it is detachably attached to the remaining supporting device 34 .

[0149] By means of the actuating device 56 , the first longitudinal support 72 and thus the first ends of all rails 50 can be moved upwards or downwards simultaneously.

[0150] The second longitudinal support 74 has a joint, the pivot axis of which extends in the tensile direction R, by means of which the second end of the rail 50 is pivotably attached to the second bearing 54 .

[0151] The conversion of the support device 34 of the second embodiment from the operating position to the assembly position and vice versa corresponds to the conversion described for the first embodiment.

[0152] By means of the support device 34 of the second embodiment, a plurality of nozzle boxes can be brought to the assembly position simultaneously, thereby further accelerating the replacement process.

[0153] exist Figure 6 In FIG. 1 , a further embodiment of the invention is shown which corresponds largely to the first embodiment, so that only the differences are discussed below. Identical and functionally equivalent components are provided with the same reference numerals.

[0154] In accordance with Figure 6 In the embodiment of FIG. 1 , the design of the nozzle box 18 is different from that of the first embodiment.

[0155] The nozzle box 18 comprises no attachments but only the base body 19. The outflow openings 44 are arranged on the upper side or outlet side 38 of the base body.

[0156] The nozzle box 18 of this third embodiment can correspond to the base body 19 of the nozzle box 18 of the first embodiment, on which the outflow openings 44 are arranged.

[0157] from Figure 6 It can be seen in FIG. 2 that the nozzle box 18 of this exemplary embodiment does not protrude into the gap between two transport rails 32 , but is located below the transport rails 32 .

[0158] As previously mentioned, in this embodiment, the wings 46 may also be provided on the nozzle box 18 .

Claims

1. A nozzle box arrangement for an oven (12) of a stretching unit (10), in particular a transverse direction orienter, a machine direction orienter and / or a synchronous stretching unit, the nozzle box arrangement comprising a nozzle box (18) and a support device (34) for the nozzle box (18), in, The support device (34) comprises a first support member (52) and a second support member (54), wherein the nozzle box (18) is connected to the first support (52) and the second support (54), The first support (52) is designed to be height-adjustable so that the nozzle box (18) can be adjusted between an operating position and an assembly position, wherein the first end of the nozzle box (18) is positioned lower in the assembly position than in the operating position.

2. The nozzle box device according to claim 1, characterized in that The support device (34) comprises a rail (50) on which the nozzle box (18) is mounted, wherein the rail (50) is connected to the first support (52) on a first side and to the second support (54) on a second side, wherein a first end of the rail (50) is positioned lower in the assembly position than in the operating position.

3. The nozzle box device according to claim 1 or 2, characterized in that: The rail (50) and / or the nozzle box (18) are arranged horizontally in the operating position; and / or the rail (50) and / or the nozzle box (18) are inclined relative to a horizontal plane when adjusting from the operating position to the assembly position.

4. The nozzle box arrangement according to any one of the preceding claims, characterized in that The first support (52) comprises two members (60, 62) pivotably attached to each other and at least one of the two members (62) is pivotable relative to the track (50) and / or the nozzle box (18), in particular wherein the two members (60, 62) stand vertically upright and aligned with each other in the operating position.

5. The nozzle box arrangement according to any one of the preceding claims, characterized in that The second support (54) is a stationary support and / or the rail (50) and / or the nozzle box (18), in particular the second side, e.g. the second end, of the rail (50) and / or the nozzle box (18), is pivotably attached to the second support (54).

6. The nozzle box arrangement according to any one of the preceding claims, characterized in that The nozzle box (18) is arranged to be slidable on the rail (50) and / or to be removable from the support device (34) via a first end of the rail (50).

7. The nozzle box arrangement according to any one of the preceding claims, characterized in that The support device (34) comprises a first longitudinal support (72) and two first supports (52), wherein the first longitudinal support (72) connects the two first supports (52) to each other, and / or the support device (34) comprises a second longitudinal support (74) and two second supports (54), wherein the second longitudinal support (74) connects the two second supports (54) to each other.

8. The nozzle box device according to claim 7, characterized in that The rail (50) and / or the nozzle box (18) extend transversely to the first longitudinal support (72) and / or the second longitudinal support (74) and / or are attached to the first longitudinal support (72) and / or the second longitudinal support (74).

9. The nozzle box device according to claim 8, characterized in that The support device (34) comprises a plurality of rails (50) and / or a plurality of nozzle boxes (18), which are aligned parallel to each other and attached adjacent to each other on the first longitudinal support (72) and / or the second longitudinal support (74).

10. The nozzle box arrangement according to any one of the preceding claims, characterized in that The support device (34) comprises an actuating device (56), wherein the actuating device (56) is configured to adjust the height of the first support member (52).

11. The nozzle box device according to claim 10, characterized in that The actuating device (56) is a screw jack, which includes a threaded spindle (64) and a spindle nut (66).

12. The nozzle box arrangement according to any one of the preceding claims, characterized in that The nozzle box arrangement (16) comprises a plurality of nozzle boxes (18), in particular wherein the nozzle boxes (18) are aligned parallel to one another and are arranged adjacent to one another along a stretching direction (R).

13. The nozzle box device according to claim 12, characterized in that A cover independent of the nozzle box (18) is arranged between two adjacent nozzle boxes (18), and / or perforated wings (46) protrude on the outlet side (38) of the nozzle box (18) along the stretching direction (R) toward an adjacent nozzle box (18).

14. The nozzle box arrangement according to any one of the preceding claims, characterized in that The nozzle box (18) comprises a plurality of outflow openings (44) which are arranged on an outlet side (38) of the nozzle box (18) and / or the nozzle box (18) has an inlet side (36) with an air inlet opening (40), wherein the inlet side (36) is located on a second side of the nozzle box (18).

15. The nozzle box arrangement according to any one of the preceding claims, characterized in that The nozzle box (18) comprises a base body (19) and an attachment (20) attached to the base body (19), wherein the attachment (20) comprises an outflow opening (44).

16. A stretching unit, in particular a transverse direction orienter, a machine direction orienter and / or a synchronous stretching unit, comprising a film transport system (14) and an oven, the oven comprising a nozzle box arrangement (16) according to any one of the preceding claims, in particular wherein: The rail (50) and / or the nozzle box (18) are arranged transversely to the stretching direction (R).

17. The stretching unit according to claim 16, characterized in that The film transport system (14) comprises two transport tracks (32) which are arranged at a distance from each other in a transverse direction (Q). wherein the nozzle box (18) is removable from the oven (12) in the assembly position of the support device (34) via a removal path located below one of the two transport tracks (32), and / or wherein the nozzle box (18) is at least partially arranged within the spacing in the operating position of the support device (34).

18. The stretching unit according to claim 16 or 17, characterized in that The stretching unit (10) comprises an air source (42), wherein the inlet side (36) of the nozzle box (18) is connected to the air source (42) in the operating position of the support device (34).

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