EP3110736B1 - Suction nozzle for a suction device - Google Patents

Description

The present invention relates to a suction nozzle for a suction device for conveying cut waste strips of a film web and a corresponding suction device.

It is generally known that in the production of film webs these must then be trimmed to achieve exact dimensions. This trimming takes place at least on the edge, so that at each edge of the produced film web, a marginal strip is produced as a waste strip. A central trimming of the film web can also be carried out, so that one or more median strips can also be produced as waste strips. In the production machine, removal and separation of these waste strips must be performed after cutting from the film web.

For the removal of the waste strips various suction solutions are known, wherein, for example, the DE 10 2012 108 109 a corresponding solution shows. In each case a waste strip is sucked into the suction device via individual suction. For the forwarding, nozzle exits are provided at the other end of the suction nozzle, which provide an introduction of the waste strips into a common suction channel. In other words, a separate extraction nozzle is provided for each waste strip or each position of a waste strip in order to carry out the corresponding promotion can. A disadvantage of the known solution is the necessary geometric design of the suction. Thus, the suction channel extends transversely to the conveying direction of the film web. A waste strip, which is cut along the conveying direction of the film web and, accordingly, also sucked into the suction nozzle, runs correspondingly transversely to the conveying direction of the film web within the suction channel. Between these two directions of the waste strip is the suction nozzle, so that within the suction nozzle, a change in the orientation of the waste strip must take place. This change in orientation follows the angle which exists between the conveying direction of the film web on the one hand and the orientation of the suction channel on the other. To ensure this, the waste strip within the extraction nozzle must perform a corresponding variation movement. Thus, a flat waste strip is rotated within the suction nozzle and transferred in the rotated or twisted position in the suction channel. In order to allow this rotation of the waste strip in the promotion, a sufficiently large cross section of the suction nozzle must be provided. Usually, these are either rectangular cross-sections or round cross-sections, which can ensure the necessary freedom for the rotation of the waste strip in the extraction in all orientations. This limitation to round or square cross-sections means that a relatively high cost of materials and above all a high space requirement for the suction is necessary. Another disadvantage is the larger fan flow required by the larger flow cross-section and thus the higher fan output required. Another exhaust is in the EP 1 334 936 A1 disclosed. It is an object of the present invention to at least partially overcome the disadvantages described above. In particular, it is an object of the present invention, in an inexpensive and simple way an improved suction available set, which in particular has less weight and / or less space. Preferably, a lower volume flow in the intake manifold and / or a lower noise is to be achieved.

The above object is achieved by a suction with the features of claim 1 and a suction device with the features of claim 10. Further features and details of the invention will become apparent from the dependent claims, the description and the drawings. In this case, features and details that are described in connection with the extraction nozzle according to the invention, of course, in connection with the suction device according to the invention and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference is or may be.

An inventive extraction nozzle for a suction device for conveying cut waste strips of a film web has a nozzle channel. This nozzle channel is equipped with a nozzle inlet for sucking the waste strips and with a nozzle outlet for introducing the waste strips in a suction channel. In this case, the nozzle channel has an inlet section adjacent to the nozzle inlet and an outlet section adjacent to the nozzle outlet. At least one rotational section is arranged between the outlet section and the inlet section, the flow cross-section of which is rotated over the course of the rotary section at least in sections.

In other words, the input portion, the output portion and the rotation portion together preferably completely form the nozzle channel. The nozzle channel is formed by walls so as to separate a channel interior from a channel environment. The nozzle channel is in particular formed fluid-tight, so that a nozzle channel of this embodiment can pass a negative pressure from the nozzle outlet to the nozzle inlet. The suction extraction by means of negative pressure can thus be ensured via the suction nozzle.

Of course, it is possible that two or more rotation sections are provided. Also, in part, a rectilinear extent between two or be provided more rotation sections, if this makes the space required in the machine.

The input portion and the corresponding nozzle inlet serve to receive the waste strip at or near the position of cutting the waste strip from the film web. This recording is done by suction through negative pressure. This negative pressure is applied to the opposite side, namely at the nozzle outlet and generated for example by a fan present in the aspirator.

Now, if a suction of a waste strip with a suction according to the invention, the following way is covered. About the applied negative pressure at the nozzle inlet, a suction of the waste strip, so that it enters the nozzle channel. After passing through the nozzle inlet of the waste strip passes through the input section in the rotary section. In the rotation section, the rotation of the waste strip, already described and necessary in the introduction, now takes place on the corresponding angular orientation of the suction channel with respect to the conveying direction of the film web. This rotation is made possible by the corresponding rotation of the flow cross section over the rotation section. After twisting, the exit section follows and, accordingly, the port exit, so that the twisted portion of the litter strip can now enter the proper suction channel in the proper suction channel of the suction device.

As is clear from the preceding paragraph, the rotation or the rotation of the waste strip is correlated with a rotation of the flow cross-section of the rotating section. Thus, the rotation portion may be understood to represent, in addition to enabling this rotation, a guide for this rotation. An undesired over-rotation in turning the waste strip can be ensured by this guide functionality of the rotation section with higher security.

Due to the fact that the rotation section with its twisted flow cross-section simulates the necessary rotation of the waste strip or even leads, the entire flow cross-section of the suction can be significantly flatter. Since film webs usually have only a small thickness in comparison to the width, the flow cross-section of the suction nozzle, for example, be formed substantially rectangular. This rectangle with a width, which is oriented in particular to the maximum width of the cut waste strips, is much more pronounced than the corresponding height. Thus, it is sufficient if a correspondingly flat rectangular flow cross-section is provided, since this flat rectangular flow cross-section is rotated in the rotation section itself for the necessary rotation of the waste strip. As can be seen from the above embodiment, can be made available in this way a much more compact and smaller and therefore also lighter and more material-saving embodiment of the suction, which also allows a lower air flow. This leads to cost savings and more compact solutions at the corresponding production facility as well as the reduced air flow to energy savings.

It should be noted that for the flow cross-section, of course, variations over the course of the suction can be possible. However, it is advantageous if there is a constant or the same or substantially the same flow cross-section for the suction nozzle and the entire nozzle channel over the entire course. Of course, the orientations of the nozzle inlet and the nozzle outlet and the corresponding input section and the corresponding output section can be chosen essentially freely. The rotation within the rotation section can be fixed or variable and accordingly adjustable.

According to the invention, the term twisting or rotating is to be understood unambiguously. Thus, a rotation of the waste strip takes place when it moves around or substantially around its conveying axis. For a flat strip in the form of a waste strip, this means that its cross section is rotated or rotated about its centroid line. The same applies accordingly for a rotation or rotation of the flow cross-section in the rotation section. In particular, the twisting of the waste strip and the rotating section is to be distinguished from one Curvature with a curve. While a rotation or a rotation in the sense of the present invention means a rotation about its own axis of rotation, for example along the conveying direction, a curvature takes place about a curvature axis which is at a distance from its own position and arranged above all in another orientation.

The individual sections, in particular the inlet section, the outlet section and the rotary section can have different flow cross-sections in the context of the present invention. For example, between a rectangular input section and a rectangular output section, a round rotary section can also be arranged. Also in this way, the rotating section causes a change in the orientation of the film strip.

• Rechteck
• Oval
• Ellipse
• Dreieck

It may be advantageous if in a suction nozzle according to the invention the nozzle channel has a constant or substantially constant flow cross-section between the nozzle inlet and the nozzle outlet. In particular, it has one of the following geometric shapes:

• rectangle
• oval
• ellipse
• triangle

The list above is a non-exhaustive list. It should be noted that only by the inventive design of the rotation section at the nozzle channel at all a free or substantially free flow cross-section selection is possible. This is due to the fact that the necessary freedom of rotation for the waste strip is provided by the rotating section and its orientation or its twisted orientation. Only then does the freedom now exist with regard to the geometric selection of the flow cross-section. Preferably, the flow cross-section is selected with a corresponding adaptation to the expected geometric dimensions of the waste strip. Accordingly, an oval training or a rectangular design with large width and lower height of advantage in terms of space requirements, flow conditions and weight and a lower flow rate.

A further advantage can be achieved if, in an extraction nozzle according to the invention, the rotation section is designed to be flexible at least in sections for a variation of the expression of the rotation of the flow section over the course of the rotation section. This makes it possible to ensure an adaptation of the necessary rotation to the respective application. For example, depending on the produced film web or depending on the orientation of the production machine, a different angular adjustment of the suction channel to the conveying direction of the film web may be given. Often, this employment will be chosen in the range of about 90 °, but of course other orientations are conceivable in principle. If the rotation section is designed to be flexible at least in sections, then the degree of rotation in the form of a rotation angle can be adjusted by the variation and the flexible and, above all, elastic deformation of the rotation section to the actually existing angle of attack between suction channel and conveying direction of the film web. One possibility of such a flexible design is, for example, a flexible tubing with a correspondingly flat cross-section, as has already been explained above.

It is likewise advantageous if, in the case of an extraction nozzle according to the invention, the rotation section rotates the flow cross-section in an angular range of approximately 45 ° to approximately 135 °, in particular in the range between approximately 80 ° and approximately 100 °, preferably in a range of approximately 88 ° and about 92 °. As has already been explained, it is crucial for the necessary rotation how large the angle of attack is formed between an extending suction channel and the conveying direction of the film web. In particular, the suction channel is formed as short as possible, so that preferably a substantially vertical orientation of the suction channel is given to the conveying direction of the film web. This angle of attack is crucial for the formation of the necessary angle of rotation in the rotary section. Accordingly, it is also preferable to provide a vertical or essentially vertical orientation during this rotation, so that as an angle of rotation, approximately 88 ° to approximately 92 ° have great advantages.

A further advantage can be achieved if the inlet section and / or the outlet section have a curved profile of the flow cross-section in an extraction nozzle according to the invention. In this case, this curved course of the input section and / or the output section has a curvature axis. This axis of curvature is in particular aligned perpendicularly or substantially perpendicular to the axis of rotation of the rotation of the flow cross-section in the course of the rotation section. As has already been explained, for the purposes of the present invention, a distinction is made between a rotation about its own axis of rotation and a curvature about a spaced axis of curvature. In an exhaust nozzle, by forming bends in the input section and in the output section, a corresponding interface alignment can be provided. Thus, in this way a flat and accordingly flow-optimized introduction of the waste strip from the nozzle outlet can be carried out in a downstream suction. By a corresponding curvature at the entrance ensures that easier threading and in particular kink-free insertion of the waste strip is made possible in the nozzle inlet. An improved adaptation or mounting possibility to a suction device arranged at the nozzle inlet can also be ensured in this way. The respective vertical orientation leads to a further improved training, especially from a fluidic point of view. Of course, in the context of the present invention, however, a straight input section and / or a straight output section can also be used.

It is also advantageous if, in an extraction nozzle according to the invention, the input section has a mounting interface for the attachment of a suction device. According to the invention, the suction can be designed solely by generating a negative pressure at the nozzle inlet. However, depending on the production machine, active support of the suction can also be provided. Thus, for example, nip rollers can be provided, which maintain a corresponding tension situation within the film web or within the waste strip, in particular via further mechanical installations. Such a suction device can be arranged or attached to a corresponding mounting interface of the input section. This allows parallel or alternative to manual threading in the Nozzle input to perform an automation of the startup process in the production of the film web.

It can also be advantageous if, in an extraction nozzle according to the invention, the outlet section and / or the nozzle outlet have a bearing device, for example in the form of a guide device, for a movable mounting, for example in the form of a guide, of the suction nozzle to a suction channel of the suction device , This is to be understood as a variation of different positions of the extraction nozzle for different positions of the waste strips. This bearing device is in particular sealed against pressure loss, so that despite the displaceability fluid-tightness or substantially fluid-tightness is present. The suction channel is accordingly designed as an abutment device in order to receive or movably support one or more suction nozzles. If, for example, different film widths for the film web are possible in a production machine, an adjustment of the individual positions of the suction nozzles to the respectively variable position as a function of the existing film width can take place through the displaceable mounting and preferably also sealing of the suction nozzle.

It is also advantageous if the width of the flow cross-section at the nozzle inlet is greater than or equal to the maximum width of the waste strip of the film web in a suction nozzle according to the invention. This means that maximum waste strips specify the corresponding maximum dimensioning of the extraction nozzle. In particular, this aims at correspondingly wide rectangular flow cross sections with very flat heights. The height of the flow cross-section is oriented not only to the maximum height of the film web, but also to the usability of the waste strip in the corresponding nozzle inlet.

It is also advantageous if, in the case of an extraction nozzle according to the invention, the rotation section has wall surfaces which have surface sections, in particular triangular surface sections, for the formation of the rotation of the flow cross section over the course of the rotation section. The surface sections are in particular flat surface sections. This leads to the fact that the assembly of individual flat and therefore easy to produce Surfaces a complex twist is provided. The use of triangular planar surface sections leads to a particularly simple and cost-effective formation of the rotation. While otherwise possibly flexible materials would have to be used, the corresponding rotation in the rotation section can also be provided by such a design by plastic deformation. Thus, similar to ventilation ducts, corresponding surface sections can simulate the twisted course of the rotation section. Of course, as an alternative to the triangular surface sections, other surface sections, for example rectangular or trapezoidal or parallelogram-shaped surface sections, are conceivable within the scope of the present invention. By alternative manufacturing methods, for example the use of composite materials such as GRP or CFRP, a continuous curved surface can also be provided.

Likewise subject of the present invention is a suction device for the extraction and promotion of cut waste strips of a film web. This suction device has a suction channel, at least one suction nozzle according to the invention, which is connected in a fluid-communicating manner with its nozzle outlet to the suction channel, and at least one fan. The fan is designed for the generation of an air flow within the suction channel and the at least one suction nozzle. By using a suction nozzle according to the invention brings a suction device according to the invention with the same advantages, as they have been explained in detail with respect to a suction nozzle according to the invention. The fan may have separate or inherently additional functions, in particular a chopping function. Thus, the individual fan blades may be equipped with appropriate cutting edges to be able to perform a re-granulation after conveying the waste strip.

Fig. 1

eine erste Ausführungsform eines erfindungsgemäßen Absaugstutzens,

Fig. 2

die Ausführungsform der Fig. 1 in einer anderen perspektivischen Darstellung,

Fig. 3

eine weitere Ausführungsform eines erfindungsgemäßen Absaugstutzens,

Fig. 4

eine Ausführungsform einer erfindungsgemäßen Absaugvorrichtung,

Fig. 5

eine Ausführungsform einer erfindungsgemäßen Lagervorrichtung,

Fig. 6

eine weitere Ausführungsform einer Lagervorrichtung,

Fig. 7

eine weitere Ausführungsform einer Lagervorrichtung,

Fig. 8

eine weitere Ausführungsform einer Lagervorrichtung und

Fig. 9

eine weitere Ausführungsform eines erfindungsgemäßen Absaugstutzens.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. They show schematically:

Fig. 1

a first embodiment of a suction nozzle according to the invention,

Fig. 2

the embodiment of the Fig. 1 in another perspective view,

Fig. 3

a further embodiment of a suction nozzle according to the invention,

Fig. 4

an embodiment of a suction device according to the invention,

Fig. 5

an embodiment of a storage device according to the invention,

Fig. 6

another embodiment of a storage device,

Fig. 7

another embodiment of a storage device,

Fig. 8

another embodiment of a storage device and

Fig. 9

a further embodiment of a suction nozzle according to the invention.

In the Fig. 1 and 2 a first embodiment of a suction nozzle 110 according to the invention is shown. This is equipped with a nozzle channel 10 which extends from top to bottom. At the upper end of the nozzle outlet 14 is shown here, which represents the end of the adjacent output section 14a. The lower end of the suction channel 110 is shown here for the nozzle channel 10 with the nozzle inlet 12 and adjacent thereto with the input portion 12a. Between the input portion 12a and the output portion 14a, the rotation portion 16a extends.

In the embodiment of the Fig. 1 and 2 are shown different curvatures and a twist. Thus, the input portion 12a and the output portion 14a are curved around a curvature axis 30, respectively. The output section 14a preferably extends around a curvature of up to about 90 °. This curvature is particularly dependent on the particular spatial situation and can also depending on the winding device be different or not exist. The input section has a curvature of approximately 30 ° to 40 ° about the axis of curvature 30. The rotation section 16a is here twisted with regard to its flow cross-section 20 around a rotation axis 40. The angle of rotation about the axis of rotation 40 is here at about 90 °.

Starting from the curvature of the Fig. 1 and 2 Now a garbage strip 210 can be sucked into the nozzle inlet 12. Curved conveying of the waste strip 210 into the rotation section 16a takes place via a curved course of the entry section 12a. There is a straight-line promotion while a rotation of the waste strip 210 is performed about the axis of rotation 40. Upon completion of this twisting operation, a further arcuate conveyance may be made about the axis of curvature 30 of the exit section 14a to finally secure it to the storage device 70, to introduce the waste strip 210 into a corresponding suction passage 130 via the port exit 14.

The Fig. 3 shows the embodiment of the Fig. 1 and 2 with a modification of the nozzle inlet 12. Thus, here a mounting interface 18 is shown, to which a corresponding suction device, which actively supports the suction of the waste strip 210, can be attached. Here, the mounting interface 18 is a flange system, which can ensure this attachment by appropriate screwing.

Also the Fig. 9 shows a modification of the embodiment of the Fig. 1 and 2 , Here it can be seen that even a straight output section 12a without any curvature is conceivable within the scope of the present invention. The other functions correspond to the embodiments of Fig. 1 to 3 ,

Fig. 4 schematically shows an embodiment of a suction device 100 according to the invention. Starting from a production machine 300, a film web 200 is produced by an extrusion process. From a certain position is a trimming, which is represented here by dashed lines. This trimming creates waste strips 210, as in this case two edge strips and a median strip. To remove these waste strips 210 from the film web 200, so that they follow along their Conveying direction F can be promoted alone in the individual film web sections, the suction device 100 is provided here. A negative pressure is applied to a suction channel 130 via a blower 120. The suction channel 130 is in fluid communication with a suction nozzle 110 of the embodiments of FIGS Fig. 1 to 3 for each waste strip 210. Thus, in this embodiment, a number of three suction nozzles 110 are provided. Schematically, the twist and the curvature is shown here. Thus, the extraction of all waste strips 210 can be made at the respective position and be converted by the combination of curvature and rotation in a common transverse orientation of the suction channel 130. Thus, following the suction channel 130, a plurality of here three waste strips 210 can be conveyed to the fan 120 via a single line. It is also shown that after passing through the blower 120 and in particular after regranulating the waste strips 210, recycling of this regranulate to the production machine 300 is possible.

In Fig. 5 is a possibility of a sliding bearing device 70, which also acts here as a sealing device, shown for the suction nozzle 110 by means of several zippers. The Fig. 6 shows an alternative solution for the storage device 70, in which case a displaceable sealing plate is provided against a foil sheet as a storage device 70. Fig. 7 also shows a solution for the bearing device 70, here the sealing is ensured by zipper systems. The Fig. 8 also shows a zipper system for the storage device 70, where a single zipper is sufficient.

The above explanation of the embodiments describes the present invention solely by way of example. Of course, individual features of the embodiments, if technically feasible, can be combined freely with one another, without departing from the scope of the present invention.

LIST OF REFERENCE NUMBERS

10

Stutz channel

12

Socket input

12a

input section

14

Neck output

14a

output section

16a

rotating section

17

wall surface

17a

surface section

18

Mounting Interface

20

Flow area

30

axis of curvature

40

axis of rotation

70

bearing device

100

suction

110

suction

120

fan

130

suction

200

sheet

210

waste strips

300

production machine

F

conveying direction

Claims (10)

1. A suction nozzle (110) for a suction device (100) for conveying cut waste strips (210) of a film web (200), comprising a nozzle duct (10) with a nozzle inlet (12) for sucking in the waste strips (210) and with a nozzle outlet (14) for introducing the waste strips (210) into a suction duct (130), wherein the nozzle duct (10) has an inlet portion (12a) adjoining the nozzle inlet (12) and an outlet portion (14a) adjoining the nozzle outlet (14) and there is arranged between the outlet portion (14a) and the inlet portion (12a) at least one rotation portion (16a), the flow cross section (20) of which is twisted at least in certain portions over the course of the rotation portion (16a).
2. A suction nozzle (110) according to Claim 1, characterized in that the nozzle duct (10) has a constant or substantially constant flow cross section (20) between the nozzle inlet (12) and the nozzle outlet (14), in particular with one of the following geometrical shapes:

   - rectangle

   - oval

   - ellipse

   - triangle
3. A suction nozzle (110) according to any one of the preceding claims, characterized in that the rotation portion (16a) is designed to be flexible at least in certain portions for a variation of the severity of the twisting of the flow cross section (20) over the course of the rotation portion (16a).
4. A suction nozzle (110) according to any one of the preceding claims, characterized in that the rotation portion (16a) has a twisting of the flow cross section (20) in an angular range of approx. 45° to approx. 135°, in particular in the range between approx. 80° and approx. 100°, preferably in the range between approx. 88° and approx. 92°.
5. A suction nozzle (110) according to any one of the preceding claims, characterized in that the inlet portion (12a) and/or the outlet portion (14a) has a curved course of the flow cross section (20), wherein said curved course of the inlet portion (12a) and/or of the outlet portion (14a) has an axis of curvature (30), which in particular is aligned perpendicular or substantially perpendicular to the axis of rotation (40) of the twisting of the flow cross section (20) in the course of the rotation portion (16a).
6. A suction nozzle (110) according to any one of the preceding claims, characterized in that the inlet portion (12a) has a mounting interface (18) for the mounting of a suction device.
7. A suction nozzle (110) according to any one of the preceding claims, characterized in that the outlet portion (14a) and/or the nozzle outlet (14) has a bearing device (70) for a movable bearing of the suction nozzle (110) on a suction duct (130) of the suction device (100).
8. A suction nozzle (110) according to any one of the preceding claims, characterized in that the width of the flow cross section (20) at the nozzle inlet (12) is greater or equal to the maximum width of the waste strip (210) of the film web (200).
9. A suction nozzle (110) according to any one of the preceding claims, characterized in that the rotation portion (16a) has wall surfaces (17), which have surface portions (17a), in particular, triangular surface portions (17a), for the formation of the twisting of the flow cross section (20) over the course of the rotation portion (16a).
10. A suction device (100) for the sucking and conveying of cut waste strips of a film web (200), having a suction duct (130), at least one suction nozzle (110) with the features of any one of Claims 1 to 9, which are connected with its nozzle outlet (14) to the suction duct (130) in a fluid-communicating manner, and at least one fan (120) for the generation of an air flow within the suction duct (130) and the at least one suction nozzle (110).

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