JP2014091311A - Corrugation die for corrugated cardboard production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugation die for corrugated cardboard production.SOLUTION: The corrugation die for corrugated cardboard production has a rotation shaft and a waveform (6). The waveform (6) includes waveform apexes (17), waveform troughs (18) and waveform side faces (19). The corrugation die (2) includes an air exhaust device. The air exhaust device includes at least one air collecting groove (20) which opens outwardly in a radial direction and extends at least partially around the rotation shaft (3), crosses at least one of the waveform apexes (17), and being defined by the first and second side walls (21, 22) facing each other. The air exhaust device also includes at least one air connection channel (24) extending from at least one of the side walls (21,22) of the at least one air collecting groove (20) and at least one air suction channel (26) which is floating-connected to the at least one air connection channel (24) and may receive negative pressure.

Description

  The present invention relates to corrugated rolls (corrugated rollers) for corrugated board manufacturing and cardboard processing, respectively. The present invention also relates to corrugated board equipment for producing corrugated board and processing cardboard, each comprising such corrugated rolls.

  This type of corrugated roll is known from US Pat. This corrugated roll has proven its value in practical applications. The roll has an air collecting groove surrounding the periphery, and air connection perforations extend from the bottom of the groove. This air connection perforation leads to an intake channel that can be exposed to negative pressure. Patent Document 2 discloses a corrugated roll including an air collecting groove extending in the circumferential direction. From the bottom of the air collecting groove, an air connection perforation that extends to the intake passage extending in the axial direction extends.

  Furthermore, a corrugated roll is known from Patent Document 3. The corrugated roll has an annular air collecting groove with air connection perforations, which extends from the bottom of the air collection grooves. This air connection perforation is connected to an intake passage extending in the axial direction.

European Patent No. 0657275B1 European Patent Application Publication No. 0009907A1 British Patent Application No. 2069555A

  An object of the present invention is to create a corrugated roll that is particularly inexpensive and easy to manufacture. The corrugated roll should also have a particularly long service life. In addition, corresponding corrugated board equipment is provided.

  According to the invention, this object is achieved by the features of independent claims 1 and 15. That is, in the case of a conventional corrugated roll, breakage of the roll occurs in a transition region between the bottom of at least one air collecting groove and at least one air connection flow path. This breakage is particularly effective. Can be prevented. This is due in particular to the fact that at least one air connection channel extends laterally from at least one collecting groove, in particular from its side. This air discharge device discharges the air trapped between the corrugated roll and the web to be corrugated in the corrugated valley region of the corrugated roll, especially when interacting with the mating corrugated roll. Is possible. Accordingly, the manufacture of corrugated cardboard is not adversely affected by air confinement or the like, which is advantageous. Further, the web to be corrugated can be reliably fixed on the corrugated roll by the air discharge device. This is due to the negative pressure generated at that time. Desirably, the at least one intake flow path extends parallel to the rotation axis or parallel to the longitudinal axis at the center thereof. A negative pressure from a negative pressure unit or a negative pressure source can be applied to the at least one intake flow path. A negative pressure pump can constitute a negative pressure unit. It is desirable to assume several intake channels.

  Conveniently, the at least one air connection channel is formed as a perforation. The term “perforation” does not necessarily mean that the at least one air connection channel is created by perforation. Other methods are equally suitable. Advantageously, the at least one air connection channel is straight and / or formed such that its entire cross-section is closed. The at least one air connection flow path advantageously has a circular cross section.

  Although only one air collecting groove may be provided, a plurality of air collecting grooves having regular and / or irregular intervals may be provided. The at least one air collecting groove is preferably in a plane perpendicular to the rotation axis. This plane is determined by the path of the air collecting groove.

  The corrugation can extend parallel to the axis of rotation. The waveform can have a specific geometric progression, such as a wave progression, and this type of waveform is preferred. However, it is also possible for the corrugation to be in at least one plane that extends at least partially obliquely to the axis of rotation.

  Advantageously, the cross-sectional area of the intake channel is larger than the cross-sectional area of the air connection channel, preferably much larger.

  It is desirable that several air connection channels are connected to one intake channel.

  Further advantageous embodiments are described in the dependent claims.

  The corrugated roll according to claim 2 is particularly advantageous in terms of flow. In particular, the air trapped in the corrugated trough region of the corrugated roll can be discharged particularly easily during interaction with the mating corrugated roll and the web to be corrugated. Therefore, turbulent flow at the time of inflow into at least one intake passage can be avoided very easily. Various geometric designs are possible, and roll breakage is particularly easily avoided.

  The embodiment according to claim 3 provides a particularly advantageous possibility of air discharge. That is, the air collecting groove extends at least partially obliquely with respect to the rotation axis.

  The corrugated roll according to claim 4 has a feature that its fatigue limit is extremely high. Its bottom region is unaffected and is therefore independent of one or more air connection channels. In particular, the inflow opening of the air connection channel is not specifically assumed in the bottom region.

  The air collecting grooves according to claim 5 can be spaced apart from each other and / or can cross each other. Several air collecting grooves can extend parallel to each other. According to the seventh aspect, the corrugated roll can be provided with a roll sleeve. It is advantageous if the at least one air collecting groove, the at least one air connection channel and the at least one intake channel are arranged completely inside the roll sleeve. The roll sleeve desirably has a substantially circular cross section.

  In the corrugated roll according to the ninth aspect, the trapped air can be drawn out particularly easily and efficiently. That is, the corrugated roll according to claim 9 is characterized by its special preferred internal flow behavior. Furthermore, the air connection channel can extend at an angle with respect to the rotation axis and directly toward the rotation axis. As an alternative, the air connection channel can be deflected obliquely with respect to the rotational axis of the corrugated roll.

  The corrugated roll according to claim 10 is very easy to manufacture. There is no need for complicated manufacturing processes or means. That is, the air collecting groove has a certain opening width. As an alternative, the air collecting groove can be at least partially tapered from the radially outer end to the radially inner end, and alternatively, at least partly In particular, it is conceivable to enlarge from the radially outer end to the radially inner end.

  The corrugated roll according to claim 11 is likewise very easy to manufacture. In this way, a particularly large amount of air can be discharged.

  The embodiment according to claim 12 is also particularly preferred in terms of flow. It makes it possible to eliminate very large amounts of air. The embodiment according to claim 13 also makes it possible to eliminate very large amounts of air. In this case, the air collecting groove is closed over the entire circumference of the corrugated roll. The air collecting groove can follow a corrugated shape with respect to its depth, so that the air collecting groove has a constant depth. However, the bottom of the air collecting groove can also have a certain distance to the axis of rotation, in which case the air collecting groove has a substantially different radial depth due to the corrugation. According to an advantageous embodiment of claim 14, the air collecting groove extends only within the limited partial cross-section of the corrugated roll. In other words, therefore, the air collecting groove is not closed over the entire circumference of the corrugated roll, so that it is virtually endless. Thus, the air collecting groove is formed by at least one individual part. If several individual parts are present, these individual parts are spatially separated from one another.

  The corrugated equipment according to claim 15 comprises at least one coupling unit. The coupling unit preferably includes a gluing unit for gluing the corrugated web and the cover web to each other using a gluing agent. As an alternative, other known combining methods can be considered.

  Preferred embodiments of the invention will now be described by way of example with reference to the drawings.

It is a schematic diagram of the cardboard equipment by this invention. It is sectional drawing of a part of corrugated roll by this invention. FIG. 3 is a detailed view of part III of FIG. 2.

  FIG. 1 is a schematic diagram of a corrugated board facility used for manufacturing single-sided corrugated board. This corrugated cardboard facility has corrugated rolls 2 arranged in the center. The corrugated roll 2 can be driven to rotate around the rotary shaft 3 and can be rotated via a corresponding bearing device (not shown). The corrugated web 4 is guided around the outside of the corrugated roll 2 with a winding angle of about 180 °. The corrugated web 4 comes from a corrugated web storage device (not shown) and is similarly supplied to the corrugated roll 2 via a known corrugated web supply device (not shown). It is advantageous to configure the corrugated web storage device as a storage roll on which the corrugated web 4 is wound so as to be unwound. As an alternative, other types of corrugated web storage devices can also be used.

  A mating corrugated roll 5 is disposed below the corrugated roll 2. The mating roll 5 is rotationally driven in the opposite direction to the corrugated roll 2. As an alternative, the counterpart corrugating roll 5 is actually driven by corrugating roll 2, in which case no separate drive is required. The mating corrugated roll 5 is appropriately attached via a known bearing device (not shown). The mating corrugating roll 5 interacts with the corrugating roll 2 so as to effectively constitute mating means for the corrugating roll 2. The corrugated roll 2 and the counterpart corrugated roll 5 have waveforms 6 and 7, respectively, and these two waveforms are mutually adjusted so that they can interact with each other. The corrugations 6 and 7 have a wavy shape and extend along the rolls 2 and 5. The corrugations 6 and 7 mesh with each other so that the flat corrugated web 4 is introduced into the corrugated roll 2 before being introduced into the roll gap 8 formed between the corrugated roll 2 and the mating corrugated roll 5. The waveform 6 is press-fitted and processed accordingly. In principle, the corrugated web 4 is created in this way.

  A gluing unit 9 is disposed on one side of the corrugated roll 2 that is adjacent. The gluing unit 9 includes an application roll 10 and a so-called pressing roll 11. The gluing unit further has a glue container 12 opened upward. The application roll 10 and the squeeze roll 11 are mounted in corresponding bearing devices so as to be rotatable about their central longitudinal axis. On the one hand, the squeezing roll 11 and the application roll 10 are in contact with each other, and on the other hand, the application roll 10 and the corrugated roll 2 are in contact with each other, so that a layer of a predetermined glue protrudes in a conventional manner in a corrugated web 4 Applied to the top region. For this reason, the application roll 10 protrudes into the paste in the paste container 12. Excess paste is squeezed out by the squeeze roll 11. Other gluing units known from the prior art can alternatively be applied to this.

  A smooth compression roll 13 is rotatably attached to the upper part of the corrugated roll 2. A roll gap 14 is formed between the compression roll 13 and the corrugated roll 2. The roll gap 14 is sized so that the cover web 15 can be guided through the roll gap 14. The cover web 15 arrives from a cover web storage device (not shown), and is guided into the roll gap 14 between the compression roll 13 and the corrugated roll 2 through a cover web supply device (not shown). The cover web storage device is also preferably configured as a storage roll around which the cover web is wound so as to be unwound. In the roll gap 14, the corrugated web 4 and the cover web 15 are glued closely together to form a single-sided cardboard.

  The corrugated roll 2 further includes a heater and an air discharge device (not shown in FIG. 1) not shown. The air discharge device, on the one hand, attaches the corrugated web 4 to the corrugated roll 2, and on the other hand, as already mentioned, the air trapped between the corrugated web 4 and the corrugated roll 2, and thus usually in the production of corrugated cardboard. It is possible to eliminate air that causes adverse effects.

  The corrugated roll 2 is a hollow cylindrical roll sleeve 16 that can be driven to rotate about the rotary shaft 3, and has a roll sleeve 16 provided with a corrugation 6 on the outer side thereof. The waveform 6 extends parallel to the rotation axis 3. The radially outer corrugated peaks 17 and the radially inner corrugated valleys 18 are alternately arranged and extend parallel to the rotation axis 3, both of which are part of the corrugated 6. The waveform 6 further includes a waveform side surface 19. The corrugated side surface 19 extends between the corrugated peak 17 and the corrugated valley 18 and connects the corrugated peak 17 to the corrugated valley 18. A partial arch forms the corrugated top 17. As an alternative method, the corrugated peak 17 can be formed in a substantially tapered shape toward one point.

  Several air collecting grooves 20 are arranged in the roll sleeve 16. Each of the air collection grooves 20 extends in a plane perpendicular to the rotation shaft 3. The air collecting groove 20 is arranged in a ring shape and is opened outward in the radial direction. In the embodiment shown, the air collecting groove 20 extends all around the rotary shaft 3 and is therefore endless. The air collecting grooves 20 can be arranged at equal intervals in the direction of the rotating shaft 3. The air collecting groove 20 has a depth larger than the waveform 6.

  The first side wall 21 and the second side wall 22 each define one air collecting groove 20 in the direction of the rotation axis 3. The side wall 21 and the side wall 22 of the air collecting groove 20 face each other. In this case, the side walls preferably extend parallel to each other, while having a spacing of 0.6 mm to 5.9 mm, more preferably 1.1 mm to 2.9 mm. The side walls 21 and 22 of one air collecting groove 20 are connected by the bottom 23 of the radially inner groove. It is advantageous if the bottom 23 of the radially inner groove has an arched cross-sectional shape. According to another embodiment, the groove bottom 23 may take other forms. For example, the groove bottom 23 can extend at least partially in a linear or planar direction.

  At least one air connection channel 24 extends laterally from each air collecting groove 20. The at least one air connection channel 24 is preferably formed in the roll sleeve 16 as a straight perforation with a circular cross section, and preferably has a diameter of 0.6 mm to 5.9 mm. More preferably, the diameter is 1.1 mm to 2.9 mm. Advantageously, several air connection channels 24, ie two or more air connection channels, extend from one air collecting groove 20. According to a preferred embodiment, several air connection channels 24 have the same angular spacing from one another.

  The air connection channel 24 extends from the side wall 21 or 22 of the air collecting groove 20, respectively. Accordingly, the side walls 21 and 22 are provided with corresponding inflow openings. According to the illustrated embodiment, all the air connection channels 24 extend from the second side wall 22. In other words, all the air connection flow paths 24 extend from the same side surface of the air collecting groove 20. Each of the air collecting grooves 20 has a radially outer head region 25, and an air connection channel 24 extends from the head region 25. Accordingly, the air connection flow path 24 is coupled to the corresponding air collection groove 20 at a position away from the bottom 23 of the groove by a certain distance. An angle β is provided between the air collection groove 20 and the air connection channel 24. The angle β is 3 ° to 44 °, preferably 6 ° to 19 °. Each of the air connection channels 24 extends from the air collecting groove 20 in a direction toward the rotation shaft 3 and in a direction along the rotation shaft 3. The air connection flow path 24 extends radially and obliquely with respect to the rotation shaft 3. According to another embodiment, this air connection channel 24 can extend from different side walls or sides 21, 22 of the air collecting groove 20. Further, alternate arrangement is possible. As an alternative, the air connection channels 24 extending from one side or side wall 21, 22 can be grouped.

  All the air connection channels 24 are connected to the internal intake channel 26. For this reason, a corresponding opening is provided in the air connection flow path 24. Each air connection channel 24 is an enlarged region in which the cross-sectional area of the air connection channel 24 widens, and more preferably, an enlarged region in which the cross-sectional area of the remaining portion of the air connection channel 24 is continuously expanded. It is preferable to have. The air connection passage 24 has an enlarged portion 27 that is in contact with each intake passage 26 and is shorter in the axial direction than the remaining portion of the air connection passage 24. It is advantageous that the wall surfaces of the enlarged portions 27 that are opposite to each other in the direction of the rotating shaft 3 coincide with each other in the direction of the rotating shaft 3 and expand outward. The intake passage 26 extends in parallel to and around the rotation shaft 3 and is disposed in the roll sleeve 16. The intake passage 26 preferably has a circular cross-sectional shape. The intake passage 26 is fluidly connected to a negative pressure unit or a vacuum unit. The end of the air collecting groove 20 is located at a position away from the air connection flow path 24 by a certain distance.

  The air discharge device includes an air collection groove 20, an air connection flow path 24, and an intake flow path 26.

  Next, the operation of the air discharge device will be described with reference to the above description. A negative pressure is applied to the intake passage 26 through the negative pressure unit. The negative pressure generated in the intake flow path 26 draws air from the air collecting groove 20 via the air connection flow path 24. As already described, the air collecting groove 20 is fluidly connected to the intake flow path 26 via the air connecting flow path 24, and therefore the air collecting groove 20 is automatically exposed to negative pressure as well. . In the region of the enlarged portion 27, the flow velocity of the drawn air decreases, but this is due to an increase in the cross-sectional area of the air connection flow path 24. This effectively creates a diffuser. The air collecting groove 20 finally reaches the corrugated web 4.

  The counterpart corrugated roll 5 can also include the aforementioned air discharge device.

2 rolls 3 rotating shaft 4 corrugated web 5 corrugated roll 6 corrugated 7 corrugated 8 roll gap 9 gluing unit 10 application roll 11 squeeze roll 12 glue container 13 compression roll 14 roll gap 15 cover web 16 roll sleeve 17 wave top DESCRIPTION OF SYMBOLS 18 Corrugated valley part 19 Wave side surface 20 Air collecting groove 21 Side wall of air collecting groove 22 Side wall of air collecting groove 23 Bottom part of air collecting groove 24 Air connection flow path 25 Head area of air collecting groove 26 Intake flow path 27 Enlarged portion of air connection channel β Angle between air collection groove and air connection channel

Claims (15)

A corrugated roll for producing corrugated cardboard having a rotating shaft (3), a corrugated waveform (6) for corrugating the corrugated cardboard, and an air discharging device for discharging trapped air,
The waveform (6) is a waveform peak (17), a waveform valley (18) alternately arranged with the waveform peak (17), and between the waveform peak (17) and the waveform valley (18). And the corrugated side surface (19) interconnecting them, wherein the air discharge device comprises at least one air collecting groove (20) and at least one air connection channel (24). And at least one air intake channel (26), wherein the at least one air collecting groove is open outward in the radial direction and extends at least partially around the rotational axis (3). Defined by a first side wall (21) and a second side wall (22) that cross a plurality of the corrugated tops (17) and face each other, the at least one air connection channel (24 ) Is the at least one air collecting groove (2 ) Extending from at least one of the side walls (21, 22), the at least one intake channel (26) is fluidly connected to the at least one air connection channel (24) and exhausts air Corrugated roll that can be subjected to negative pressure.   The corrugated roll according to claim 1, characterized in that the cross section of the at least one air connection channel (24) is at least enlarged in the region of at least one adjacent intake channel (26).   The corrugated roll according to claim 1 or 2, wherein the air collecting groove (20) is arranged in at least one plane extending at an angle with respect to the rotation axis (3).   The corrugated roll according to any one of claims 1 to 3, wherein the air collecting groove (20) has a closed radially inner bottom region (23).   A plurality of air collecting grooves (20) are provided, at least two of the air collecting grooves (20) being in intersecting planes, according to any one of claims 1-4. Corrugated roll.   A plurality of air collecting grooves (20) are provided, and the at least one air connection channel (24) extends from each second side wall (22). A corrugated roll according to claim 1.   A corrugated roll according to any one of the preceding claims, characterized in that a ring-shaped roll sleeve (16) is provided, in which the air discharge device is arranged.   The corrugated roll according to any one of claims 1 to 6, characterized in that at least one air connection channel (24) is provided in the region of each corrugated trough (18).   The air connection flow path (24) extends at an angle with respect to the air collection groove (20). In this case, the air connection flow path (24) and the air collection groove (20) 9. Corrugated roll according to any one of claims 1 to 8, characterized in that there is an angle [beta] between 3 [deg.] <[Beta] <44 [deg.], Preferably 6 [deg.] <[Beta] <19 [deg.].   The corrugated roll according to any one of claims 1 to 9, wherein the side walls (21, 22) are parallel to each other.   The air collecting groove (20) has a radially outer head region (25), and the air connection channel (24) extends from the head region (25). The corrugated roll as described in any one of -10.   The corrugated roll according to any one of claims 1 to 11, wherein the air connection channel (24) extends from a corrugated valley (18).   The corrugated roll according to any one of claims 1 to 12, wherein the air collecting groove (20) extends all around the rotating shaft (3).   14. The air collection groove (20) according to claim 1, wherein the air collection groove (20) extends around the rotation shaft (3) only in a partial periphery of the corrugated roll. Corrugated roll. At least one corrugated web supply device for supplying at least one corrugated web (4), at least one corrugated device for corrugating said at least one corrugated web (4), and at least one cover web At least one cover web supply device for supplying (15), at least one coupling unit for connecting said at least one corrugated web (4) and said at least one cover web (15) to each other; Corrugated cardboard equipment for manufacturing corrugated cardboard, comprising:
The at least one corrugated apparatus is at least one corrugated roll (2) that can be rotationally driven according to any one of Claims 1 to 14, and at least an attachment to the at least one corrugated roll (2). Corrugated cardboard equipment comprising a corrugated roll (5) on the other side.

Images