JP3428985B2 - Production of corrugated paper and its method - Google Patents

Abstract

The invention relates to an improved method and apparatus for producing paper board structures wherein two corrugated mediums are bonded together at their flute tips. End gears (16a, 16b, 15a, 15b) are provided, at least, on the ends of the corrugating rolls (4, 6) which provide tip to tip bonding. The end gears may be abutting or non abutting and may be provided on both ends of the corrugating rolls, which assist tip to tip bonding.

Description

The present invention relates to an improved method and apparatus for forming a paperboard structure in which two corrugated cardboard cores are joined together at their tops. A structure of this kind is disclosed in Australian Patent 567833, which is also incorporated herein by reference.

One apparatus for forming such corrugated board structures is disclosed in Australian Patent No. 609089 (11926/88), which is also incorporated herein by reference. In addition, Australian Patent No. 615,053, which discloses a four-roll device in which one of the four corrugating rolls also functions as a carrier roll for transporting the spliced base paper to the liner splicing zone, and an alternative to the carrier roll U.S. Pat. No. 4,935,082 using toothed belt for
There is a variation of the basic device as disclosed at present in the issue. The invention described and defined herein is equally applicable to variations of the basic device where joining of crests is required.

One of the main problems in producing a paperboard structure in which two corrugated cardboard shins are properly joined together at the top of the corrugated cardboard is that the corrugated corrugated corrugated corrugation peaks are aligned along the entire width of the corrugated cardboard shin. It means accurate alignment.
This problem arises from the fact that the pressure between the crests along the entire length causes misalignment of the crests.

The present invention was predicated on the discovery that the problem of maintaining corrugating rolls atop one another usually results from a lack of rigidity in the overall boardmaking machine. The lack of rigidity is mainly due to the support frame,
It is believed to be due to the lack of rigidity with the corrugating roll and the shaft that twists during operation. Therefore, as a result of the movement of the corrugating roll and the frame, misalignment occurs at the top of the roll.

In the prior art, the problem of aligning the corrugating rolls that mesh with each other was treated separately from the problem of maintaining the alignment of the corrugating rolls in contact with each other. Prior art is shown in U.S. Pat. No. 4,811 which discusses the problem of aligning interlocking corrugating rolls to adjust the subsequent gap.
96046. The patent describes the use of a pair of intermeshing helical gears and mounting an axial adjuster on one of the gears to adjust the gap between the corrugating roll stages intermeshing with each other. . Adjustable intergap roll clearance reduces machine wear and tear and reduces paper web breakage due to gap degradation.

The object of the present invention is to improve at least some of the problems of the apparatus disclosed in AU 609089 and its variants as previously discussed in patents AU 615,053 and US 4,935,082. And to overcome, and thus improve the quality of paperboard products and the efficiency of the process.

The present invention provides an improvement on the basic device and variations thereof as discussed above.

Accordingly, the present invention comprises two pairs of corrugating rolls that are synchronized so that two corrugated base papers are oriented to precisely join the corrugations. , Forming a corrugated cardboard that has a cooperating end gear that orients the stepped base paper to join the tops together and two stepped base papers are joined at the tops. A cardboard manufacturing apparatus capable of performing the above is provided.

More specifically, end gears are provided on the corrugating rolls that cooperate to bring the tips together and abut each other to join the corrugated cardboard cores to each other.

More preferably, a set of end gears is attached to each end of the corrugating roll.

Providing cooperating end gears helps maintain the same surface speed at the apex of the steps to be joined, so that the corrugating rolls are precisely aligned with each other. Thus, the alignment of the corrugated crests of each corrugated board can be performed, which is essential for consistently improving the performance of the cardboard and maximizing the weight reduction of the base paper and liner. . The advantages of providing this type of cardboard construction are described in Australian Patent 567,833.

The end gears are attached to both ends of the center corrugating roll of the core pair and consist of one full face gear wheel and one split face gear wheel to allow for backlash adjustment. Is preferred, but it is not essential.

It does not discuss, or even suggest, that conventional devices could use end gears in connection with aligning corrugated cardboard shins and joining them together at their steps where they are joined. It's obvious. The prior art relates only to the actual corrugating process and the corrugating rolls that interlock with each other.

The end gears are preferably butt end gears, and
It is preferably located at a slight distance from the grooved surface of each corrugating roll, as is advantageous to help reduce shaft twist. The butt end gears allow the use of conventional vacuum corrugating rolls with standard size trunnions and generally minimize the torsional deflection that occurs. By providing the butt end gears at both ends of the corrugating roll, the overall rigidity of the device can be further improved, and the torsion of the shaft can be further reduced.

The end gears may be non-butt end gears, or the gears may be mounted outside the vacuum collector and machine frame. Non-butting when the corrugating roll has a larger trunnion, which allows it to withstand the large torsional stresses caused by the point-to-point pressure that occurs during the step-to-step joining process. End gears can be used.

The end gears are preferably precision ground so that the meshing is precise.

  The end gears may be spur gears or helical gears.

The gear may be cracked. When gears are provided at each end, it is preferable to split the gears at each end. In that case, the split gear will mesh with the wider face gear on the other corrugating roll. This configuration helps to absorb backlash and at least 50 of the applied torque.
%, Which further prevents twisting of the corrugating roll and shaft.

When using a helical gear as the butt end gear, it is necessary to install a shim between the end face of the corrugating roll and the helical gear when adjusting the helical gear in the axial direction. Will.

When mounting helical gears on both ends of the roll, the helical patterns of each gear can be opposed to ensure that the thrust forces cancel each other out. If the helical gear is attached to only one end, the corrugating roll and the shaft will twist out of alignment with the corrugated roll against the axial thrust generated by the helical gear. To prevent this, additional thrust bearing capacity will be required.

One embodiment of the invention will now be described with reference to the drawings: Figure 1 shows a schematic view of a single-sided machine of the type disclosed in Australian Patent 609089.

FIG. 2 is a cross-sectional view of a corrugating roll equipped with a butt end gear.

FIG. 1 shows a single-sided machine of the type disclosed in Australian Patent No. 609089. One of the pair of corrugating rolls 3 and 4 and 5 and 6 is one of the corrugated paper rolls 1 and 2 which is held on an unpaper roll-up stand (not shown) and which has generally passed through a preheating device (not shown). (Items 3 and 5). After corrugating the base papers 1 and 2, an adhesive is applied by an adhesive station 7 to at least one of the surfaces 1 or 2. Next, when the corrugated cardboard cores 1 and 2 are attached to each other by the corrugating rolls 4 and 6, the corrugated cardboard cores are joined together. After sending the combined two sheets of core paper to the carrier roll 12 and applying glue to the top of the corrugated paper, it is conveyed to the joining zone where the liner 9 is attached so as to contact the top of the paper and heated. The device 11 applies heat to it. Next, the carrier roll 12 conveys the combination of the liner and the base paper to the place where the product is delivered to the inclined transport conveyor 14 for delivery to the corrugator bridge.

Note that a toothed belt can be used in place of the carrier roll 12 according to a variant of the basic device.

FIG. 2 shows an embodiment of the present invention. In this case, the corrugating rolls 4 and 6 of the single-sided machine, which are corrugating rolls for aligning and joining the corrugated corrugated corrugated cardboard-aligned arrays, The end gears 15A and 15B and 16A and 16B are fixed. In this embodiment, corrugating rolls 34 and 6 are used.
7 shows the use of split spur gears 15A and 15B and 16A and 16B that abut against the. It should be noted that end gears should be placed on both ends of the corrugating roll for alignment to maximize the rigidity of the device and to minimize the twist of the corrugating roll to be aligned. Is. End gears 15A and 15B and 16A and 1 in this embodiment
6B is fitted in the space between the vacuum collector 17 and the corrugating rolls 6 and 4. It should be noted that the space can be formed such that all four corrugating rolls are axially movable relative to each other if the repeated wear pattern of the corrugating rolls is not acceptable. The vacuum collecting device 17 and the connecting portion extending from the vacuum collecting device 17 to the corrugating rolls 4 and 6 can communicate with the corrugating rolls 6 and 4 through the end gears 15A, 15B, 16A and 16B. In order to ensure a reliable but elastic contact between the end gears (15A, 15B, 16A and 16B) and the vacuum trap system 17, the vacuum trap 17 is spring loaded by a spring structure 19 .

The end gear does not necessarily have to abut the corrugating roll, which depends on the diameter of the corrugating roll with the larger diameter shaft. Higher, shorter crest spacing For larger diameter rolls that can be used when a smaller crest is required, the end gears do not have to abut the roll, and it is even possible to house the end gears outside the main housing. is there. In addition, when vacuum is not used to help hold and support the paperboard on the corrugating roll, a larger roll can be used when fingers are used instead, so the end gears can be removed from the corrugating roll. It is possible to separate.

In order to produce a particular step, for example the step disclosed in Australian Patent 567833, the corrugating roll and shaft diameters may be limited to produce the desired step spacing and step depth. . In those cases, it may be necessary to abut the end gears to maximize the rigidity of the device.

Furthermore, in order to help absorb backlash and transmit the applied torque, split spur gear 16A
The tooth width of is expanded. In general, the tooth width of the end gear is determined by the braking torque, which in principle should be at least three times the driving torque generated. The end gears 16A and 16B are driven in cooperation with the end gears 15A and 15B,
The carrier roll 12 is driven via a ring gear (not shown) attached to the carrier roll 12. Similarly, if a toothed belt is used, the end gears can drive the belt.

The end gears 15A and 15B and 16A and 16B may be fixed to the shaft of the corrugating rolls 4 and 6 by some locking assembly, for example a multi-taper locking sleeve 21. The only requirement for the stop assembly is that it precisely holds the position of the gears to transmit large ambient forces without circumferential movement.

To secure the split gears 15A and 15B to each other, a set screw 20 may also be used that also allows the gears to be adjusted relative to each other to reduce backlash. Similarly, the fixing screw 20 can be incorporated into the split gears 16A and 16B. The end gears 15A, 15B, 16A and 16B shield the cardboard being processed depending on how close they and the corrugating roll are and prevent the cardboard from becoming entangled with the rotating end gear. It may have a shroud (not shown) to prevent it.

The end gear must be attached to at least the corrugating roll that is directly related to the joining of the steps, but the end gear can be attached to another roll such as a carrier roll or a toothed belt mechanism. Note that you can wear it.

The frame 18 may also be reinforced and / or modified to increase the rigidity of the frame, and thus typically the rigidity of the device.

The above improvements to existing machines help to provide better cardboard products and produce cardboard products more efficiently, resulting in reduced machine wear and reduced raw material usage.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 63-203325 (JP, A) JP 62-116133 (JP, A) JP 60-180829 (JP, A) JP HEI 2- 277621 (JP, A) JP-A-4-145213 (JP, A) JP-A-3-504834 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B31F 1/28

Claims (8)

(57) [Claims] 1. A center provided with two pairs of corrugating rolls (3, 4; 5, 6) so that a corrugated cardboard made by joining two stepped base papers to each other at their tops can be formed, and which do not mesh with each other. Between the two corrugating rolls (4, 6) of said two corrugating rolls so that the two corrugated base papers are aligned for precise joining of the corrugations. (3,4; 5,
In the corrugated board manufacturing apparatus in which 6) is synchronized, a spur gear or a helical gear (15A, 15B, 16A, 16B) are fitted in mesh with each other and abutted against the ends of the two corrugating rolls, respectively, whereby the alignment for precise joining of the crests is maintained. , Corrugated board manufacturing equipment. 2. A center provided with two pairs of corrugating rolls (3,4; 5,6) so as to form a corrugated board in which two stepped base papers are joined together at their tops, and which do not mesh with each other. Between the two corrugating rolls (4, 6) of said two corrugating rolls so that the two corrugated base papers are aligned for precise joining of the corrugations. (3,4; 5,
In the corrugated board manufacturing equipment in which 6) is synchronized, a trunnion with a large diameter is used for each of the two corrugating rolls in the middle that do not mesh with each other, and flat meshes that mesh with each other near the ends of the trunnion. A corrugated board manufacturing apparatus, characterized in that gears or helical gears (15A, 15B, 16A, 16B) are provided as end gears, thereby maintaining alignment for precise joining of the steps. 3. The corrugated board manufacturing apparatus according to claim 1, wherein the two corrugating rolls (4, 4,
A corrugated board manufacturing apparatus characterized in that the surface speed of 6) is constant. 4. The corrugated board manufacturing apparatus according to claim 1, wherein at least one end gear is a split gear. 5. The corrugated board manufacturing apparatus according to claim 4, wherein the gear to be combined with the split gear is a gear having a wide surface width for absorbing backlash. 6. The corrugated board manufacturing apparatus according to claim 1, further comprising a vacuum collecting device (17), wherein the vacuum collecting device (17) and the two corrugating rolls ( Four,
6) A corrugated board manufacturing apparatus, characterized in that the end gears (15A, 15B, 16A, 16B) are provided between the end gears. 7. The corrugated board manufacturing apparatus according to claim 1, further comprising a carrier roll, and the carrier roll is also provided with an end gear. 8. The corrugated board manufacturing apparatus according to claim 1, wherein the end gear reduces torsional stress applied to the shaft of the corrugating roll (3, 4; 5, 6). A corrugated board manufacturing apparatus, which is characterized by: