NL8000208A - IMPROVED ROLLS FOR USE IN A WAVY FIBER BOARD PRODUCTION SYSTEM. - Google Patents

Description

• Λ Ν.Ο. 28601 1 <· »

Improved rollers for use in a corrugated fiber sheet production system.

The invention relates to improved rolls for use in corrugated fiber sheet production and processing machines.

The roller according to the invention is intended to be used as a guide roller in a gluing station of a corrugated fiber sheet machine, as a load roller in a heating station, in a feed roller configuration for a rotary cutting device and in a feed roller configuration in processing machines for corrugated fiber plate, such as printers, folding gluers and rotary punching machines.

Generally, the corrugated portions in single-sided or double-sided corrugated fiber sheet will be crushed or deformed when the sheet is engaged between rollers.

This tendency occurs particularly when the outer layer used is very thin.

It is therefore a major problem in the corrugated fiber flat industry to prevent such deformation of the corrugated parts and to maintain the thickness of the corrugated fiber sheet at issue.

In a gluing station of a corrugated fiber board machine for producing corrugated fiber boards, a glue roller is used to apply glue to the top ends of the corrugations of a single-sided corrugated fiberboard sheet fed from a previous station. Above the glue roller there is a heavy guide roller made of steel. The shaft of this guide roller is supported by a lever which is generally adjusted to press the material lightly against the glue roller to avoid applying too little glue or an uneven amount of glue.

The guide roller presses against the material web on that side where the one outer layer is located. In addition to the unevenness due to a certain irregularity in the pleat height (the difference between high and low) created during the corrugation process, the outer layer surface is also uneven and this surface will tend to protrude less high on those parts that face to the undersides of the undulations than to those parts that face its peaks. Furthermore, the conventional guide roller generally has a line or tangential contact with the web of material. The guide roller is therefore generally set so that its underside contacts the lowest portions of the outer layer or even set to an even lower position to achieve a certain bonding. The boom mechanism supporting the guide roller is provided with a stop element to prevent the guide roller from dropping even further from its preset position. Thus, the lever only allows upward movement of the guide roller, which is however too heavy to be moved upward. Because of this configuration described in the above, the corrugations 15 are more or less deformed when the corrugated fiber sheet web is clamped between the glue roller and the guide roller.

Furthermore, because the conventional guide roller is made of steel and because the roller must be adjusted so that the material is lightly pressed, there is a tendency to apply more than the necessary amount of glue to the wave crests. This means a waste of glue while the single-sided golf course also absorbs too much moisture.

Excessive moisture absorption is undesirable for the following reasons. First of all, the corrugated fiber sheet web will soften strongly due to the excess moisture, allowing the corrugations to deform even more as the material passes between a number of rolls in a subsequent step.

Second, the material must absorb a greater amount of heat in the heating station that follows the glue station. That means a greater loss of heat energy, you also have to keep the material in the heating station for longer. As a result, the speed of the machine is reduced and therefore the production per unit time is reduced. Furthermore, the pressure with which the material is pressed against the heating plates must be increased in order to obtain a better heat absorption. This also increases the tendency to deform the undulations.

4-0 Third, an excessive amount of moisture for 8000-208 .3% increases the tendency to warp the corrugated fiber sheet, which can lead to machine difficulties while also producing a defective product.

As soon as another outer layer is used, the 5-distance between the glue roller and the guide roller must be adjusted again. This adjustment is very difficult and requires a high degree of craftsmanship. This readjustment of the distance is also required when the depth of the undulation or the distance between high and low changes. Therefore, in general, a combination of a guide roller and a glue roller with a preset spacing is prepared for each type of corrugation.

In the heating station of the corrugated iron machine, a number of load rolls, made of steel, are arranged to press the corrugated fiber sheet web against the heating plates via a cotton band for better heat conduction. Each load roller is provided with a shaft supported by a lever or a wedge which makes it possible to adjust the pressure exerted on the material web.

The greater the pressure exerted on the material by the load rollers, the better the bonding and the higher expected machine speed can be, but at the same time the possibility of deformation of the 25 undulations increases. Because the load rollers press against the material via a cotton tape running in a linear or tangential manner, the pressure applied to the material is considerable even if the material is not pressed directly by the cotton tape.

When the connecting plates in the cotton band where the band sections are joined together for example by means of a stitching and the swollen parts thereof where foreign material is attached pass under the load rollers, the rollers will spring up, exerting an excessive pressure on the material web which can lead to deformation of the undulations.

Also in the heating station, the distance between the weight rolls and the heating plates must be adjusted again and again depending on the corrugation type, the 4-0 material and so on of the corrugated fiber sheet web.

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The deformation of the undulations is most likely to occur in those processes where the web material contains a large amount of moisture, ie in the glue station and the heating station.

Seen upstream of a rotary cutting device there is further a pair of guide rollers made of steel intended to guide the corrugated fiber flat track in the direction of the rotary cutting device. These guide rollers rotate at a slightly higher speed than the feed speed of the material web, so that the material web is guided without accumulation for the rotary cutting device. Thus, the web of material is fed to the rotary cutter while it is slightly pulled by the guide rollers.

With conventional steel guide rollers, the top and bottom guide rollers contact the corrugated fiber sheet web through a substantially tangential or transverse line. In order to guide and also slightly pull the web of material, the pairs of guide rollers 20 must clamp the material with a considerable pressure, which leads to deformation of the corrugated fiber sheet web.

Pairs of steel guide rollers are also used in other corrugated fiber sheet processing machines such as impression machines, folding glue mahines and rotary cutting dies. On these machines, too, deformation of the undulations can occur as a result of the clamping force exerted by the guide rollers. The deformation can also occur with auxiliary guide rollers and processing rollers arranged in such processing machines.

The object of the invention is now to provide rollers which can be used in corrugated fiber production and processing machines, which rollers have an elasticity on their outer surface to prevent deformation of the corrugations without the need for a perform frequent adjustment of the between the rollers in accordance with change of material, type of undulation and so on.

Other features and advantages of the invention will become apparent from its preferred embodiments described in the figures.

8000208 5 *

Figure 1 shows in a schematic view how the roll according to the invention can be used in a glue station and a heating station of a corrugated fiber sheet machine.

Figure 2 schematically illustrates how the roll can be used in the subsequent portion of a corrugated fiber sheet machine.

Figures 3 to 18 show partly cut away various embodiments of the invention.

Figure 19 shows a cross section through a variant 10 of the embodiment of Figure 18.

Figure 20 shows a cross section through another variant of the embodiment of Figure 18.

In the figures, like reference numerals have been used for corresponding parts.

Figure 1 shows a glue station A and a heating station B of a corrugated fiber board machine in which the rollers 1 according to the invention are used as guide rollers and load rollers, respectively.

The glue station A generally consists of a glue pan 2, a glue roller 3 * partially immersed in the glue in the glue pan 2, a scraper roller 4 for controlling the amount of glue remaining on the glue roller and a guide roller 5 that rotates in contact with the glue roller 3, whereby a single-sided corrugated fiberboard web S is clamped between both rolls to be provided with glue.

A coating web L is adhered to the material web thus glued and the double-sided material web S 'is dried in the heating station B where it is pressed by the load rollers 6 against the heating plates 7 via a cotton tape 8.

Figure 2 shows a part of a corrugated fiber sheet machine in which the double-sided corrugated fiber sheet web S 'passes through a cutting-marker C and is supplied by means of a pair of guide rollers 9, 10 to a rotary cutting device D. The lower guide roller 10 can be replaced through a guide plate. The upper guide roller 9 is generally set at a slightly higher rotational speed than the speed of the web of material in order to exert a tensile force on this web.

Although in the example of figure 2 the roller 1 according to the invention is only used for the upper guide roller 9, it can also be used for both guide rollers or for the lower guide roller 10.

Various embodiments of the roller according to the invention are described in the following with reference to Figures 3 to 20.

The first group of exemplary embodiments illustrated in Figures 3 to 7 concerns rollers provided with a roller body covering one or more tubes made of a natural or synthetic rubber or a synthetic resin material with some flexibility but not gas permeable which tubes are intended to be filled with a pressurized gas to impart elasticity to the roll.

In the embodiment illustrated in figure 3, the roller 1 has a roller body 11 and two tubes 12 which are spirally wound around the roller body, which roller body is provided with a gas supply opening 13 for supplying the pressurized gas such as, for example, air in the tubes 12. 20 Each tube end can be connected to the opening 13 by means of a coupling which also serves as a means for fixing the tube. The tube can be attached by any suitable means, such as glue or adhesive tapes.

The gas can be introduced into the tube by means of a hose (not shown) which is coupled to the gas supply opening 13 with the insertion of a rotary coupling.

The roller body 11 is provided with a spiral groove 15 in its outer wall in which the tubes 12 are partially received to securely fix the tubes into which the air is pressed.

The embodiment of Figure 3 includes two tubes 12 which are spirally wound around the roller body in opposite directions starting at the ends and extending towards the center to prevent the web of material from moving in one or the other transverse direction.

The embodiment of Figure 4 is substantially the same as the embodiment of Figure 3 except that a single tube 12 is spirally wound around the roller body in the spiral groove 15 in a single direction. In case the speed of the roll 1 is high or the width thereof is relatively small, the material web will not want to move in the side direction even if the tube is wound in one direction around the roll body as in this embodiment.

The embodiment of figure 5 comprises a roller body 11 provided with a number of annular grooves 15 in its outer wall and as many annular tubes 12 mounted in said annular grooves.

In the embodiments of Figures 5, 4 and 5, gas can be introduced via a gas supply opening 14 · provided with a stopper which will be further described with reference to Figures 6 and 7 · In that case, the passage opening 15 and the rotary coupling is not necessary of course.

The embodiment of Figure 6 includes a roller body 11 and a plurality of tubes 12 mounted on the roller body 20 parallel to each other and on the axis of the roller body, each of the tubes having a gas supply opening 14 with a plug.

In the embodiment of Figure 7, a number of tubes 12 are mounted on the roller body 8 at an angle to the axis of the roller body.

The embodiments of Figures 4-7 can be provided with a gas supply opening 13. grooves 15 ca couplings for connecting the tubes 12 to the gas supply opening 13 and a rotatable coupling for connecting a hose to the gas supply opening if necessary, although some of the components mentioned are not shown in the figures.

Instead of supplying the gas through a supply opening with a plug 14, gas can also be injected into the tube using an injector or a syringe if the wall thickness and the material of the tube 12 are such that the gastightness is also ensured after the injector has been removed from the tube.

In the embodiments of FIGS. 3 ~ 7, the distance between the adjacent tube sections must be such that the normal conductivity of the corrugated fiber sheet web is not affected.

A second group of exemplary embodiments will now be described with reference to Figures 8 to 11. These are provided with one or more tubular coverings which are applied to the roller body and attached thereto at each end, after which gas is introduced into the space formed between the tubular coating and the outer circumference of the roller body so that the roller surface obtains its elasticity . The pipe liner is made of a flexible gas impermeable material, such as, for example, natural or synthetic or a synthetic resin material.

The embodiment of Figure 8 includes a roller body 11, the tube liner 16 mounted on the roller body and the straps 17 for securing the tube liner to the roller body at each end thereof. The tape can be replaced with a glue strip or a glue tape. Air is introduced into the space formed between the pipe liner 16 and the roller body 11 through the gas flow apertures 13 formed axially and radially in the roller body 20. The pipe liner is provided on its inner wall with annular ribs 21 as a sealant to separate the above space into a number of sections. This separation has been performed to prevent the pipe casing 16 from expanding into a barrel shape when gas is blown into the space.

The embodiment of figure 9 is provided with a rolling body 11, a number of relatively narrow pipe linings 16 'mounted on the rolling body, sealing means such as the straps 17' for attaching the pipe linings to each end thereof and the space being gas-tight formed between the rolling body and the pipe linings. Gas is introduced into the spaces through the gas supply opening 13 formed in the roller body 11. If the distance between the gas-filled parts of the pipe linings 16 * is too great for uniform conduction of the corrugated fiber sheet web, then separate (not shown) elastic elements are mounted between the adjacent pipe linings 16 'to fill the "valleys" formed therebetween.

4-0 The embodiment of Figure 10 includes the roller body 800Ö208 9% 1, a pipe liner 16 mounted on the roller body, clamping straps 17 for securing the pipe liner to the roller body at each end thereof, and sealing means comprising a number of strands 18 which annularly around the pipe casing are wound at an appropriate mutual distance such that the space formed between the pipe casing and the roller body is divided into a number of gastight sections. The embodiment of Figure 10 is similar to that of Figure 9 except that a single pipe liner is used and the strands 18 are used as sealants instead of the wider bands 17

The embodiment of Figure 11 is substantially the same as the embodiment of Figure 10 except that a single strand 18 is spirally wound around the pipe casing 16.

In the embodiments of Figures 8 to 11, gas supply openings are also formed in the roller body, a rotary coupling is used to connect a gas supply hose to the gas supply opening, and if necessary, a gas supply port can be used to directly introduce gas in each section (instead of the gas supply opening and the rotary coupling), although not all components are shown in the figures before.

In the embodiments of Figures 8 to 11, a stop valve or the like may be provided for each section of the space between the rolling body and the pipe liner to prevent gas leakage from any broken portion of the pipe liner.

A third group of embodiments will be described hereinafter with reference to Figure 12. In the embodiments of this group, a pipe coating of a synthetic resin material with a large number of air bubbles thereon or mounted thereon on the roller body. In other words, the pipe casing used is elastic in itself.

The embodiment of Figure 12 includes the roller body 11 and the tubing 19 with a plurality of independent air bubbles 20 thereon and mounted on the roller body 4-0 such that the outer circumference thereof is enclosed and secured 8 D 0 0 2 0 8 i 10 at the hollow body at each end by means of bands, strands, strips or the like.

This type of pipe liner can be replaced by a porous liner with a large number of continuous air bubbles such as in a sponge.

The fourth group of embodiments will be described next with reference to Figures 13 to 17. This group of embodiments has a roller body whose outer circumference is enclosed by at least one elastic member with intrinsic elasticity.

The embodiment of Figure 13 has a roller body 11 and two elastic members 22 in the form of strands which are spirally wound around the roller body. The elastic members can be attached to the roller body 11 by means of glue, glue strips or other suitable fastening means. The roller body 11 is preferably provided with spiral grooves 15 in which the elastic members 22 are partially received. Thereby a stable support of the elastic members on the roller body 20 is obtained. In the embodiment of Figure 13, two elastic members are spirally wound in opposite directions starting in the center of the roll to prevent the corrugated fiber sheet web from running cleanly.

The embodiment of Figure 14- is substantially the same as the embodiment of Figure 13 except that a single elastic member 22 is spirally wound in one direction. In case the roll speed is high or the roll is narrow, the fiberboard web will also continue to run cleanly even if the elastic member is wound in a single direction.

In the embodiment of Figure 15, a plurality of annular elastic members 22 are mounted in annular grooves 13 formed in the outer wall of the roller body 11 at suitable spacings.

in the embodiment of Figure 16, a number of elastic members 22 are mounted on the roller body 11 such that they run parallel to the axis of the roller body and to each other. The grooves 15 are formed in the outer wall of 4-0 the roller body 11 for stable support of the 8000208 11 elastic members.

The embodiment of Figure 17 differs from that of Figure 16 only in that the elastic elements 22 are mounted on the roller body 11 at an angle to the axis of the roller body.

In any of the embodiments of FIGS. 15 to 17, the distance between the elastic members 22 should not be so great as to influence the smooth conduction or passage of the corrugated fiber sheet web. In any of the embodiments, the elastic members can be attached by means of glue, adhesive strips or other suitable fasteners.

In the embodiments of Figures 13 to 17, the elastic member 22 takes the form of a cord Ί5 or strand of circular or rectangular cross section. This group of embodiments therefore has the advantage of a greater elasticity of the elastic member and a smaller amount of material used.

The embodiment of Figure 18 includes the rolling body 2 ° 11 and a tubular elastic member 25 mounted on the rolling body such that the outer circumference thereof is enclosed, said elastic member being secured to the rolling body by means of tapes, adhesive strips or other suitable means. Because the elastic member is in the form of a coating, this embodiment is preferable because the contact with the material cap site has a larger surface area.

The liner must be attached to the roller body 11 by means of glue and the elastic tubular element 25 is preferably provided with an adhesive layer 24 on its inner surface as illustrated in Figure 19.

The roller of Figure 20 is similar to the roller in the embodiment of Figure 18 and in this case, the tubular elastic member 25 is provided with a coating 25 on its outer surface in order to improve strength, wear resistance and cleaning capabilities for foreign materials. to adhere to the surface.

The possibility of good cleaning is particularly important in the case of guide rollers where the 8000208 (12 is likely to get splashes of glue on it. This coating is required in particular if the elastic member 2 is made of foamed plastic .

The tube 12, the tube liners 16, 16 ', 19, the elastic member 22 and the tubular elastic member 23 may be made of natural rubber or synthetic rubber such as ethylene vinyl acetate (EVA), butadiene rubber (BR), styrene butadiene rubber ( SBR) or acrylonitrile butadiene rubber (NBR), or synthetic resins such as uretan 10 or polyethylene or combinations thereof. Preferably, these materials should be able to be well formed and processed, have good elasticity and heat resistance, be easy to clean from foreign materials and have high wear resistance. It must be able to be constructed in the form of a single layer or in the form of two or more layers made from the same or different materials. They can also be reinforced by weaving fibers or the like into the material or placing them between the layers in order to increase their strength. In particular, the pipe linings 16 and 16 'can be reinforced with steel wires to maintain a good shape for normal conducting of the material web.

The coating 25 may consist of a synthetic resin 25 such as polyester, nylon or a silicone resin.

Natural rubber has a higher elasticity than synthetic rubber because of the lower hardness, but synthetic rubber has a better wear resistance and a higher heat resistance than, of course, rougher.

The advantages of the roller according to the invention will be discussed below.

If the roll is used as a guide roll in a gluing station of a corrugated fiber board machine, in which the single-sided corrugated fiber material web S passes between the glue-roll 3 and the guide roll 5 (see figure 1) for applying glue to the tops of the corrugated parts, the roller 1 is not in contact with the material web over a certain surface but over a certain surface because of its elasticity, so that the pressure exerted on the 4-0 material 8 per unit area will be less than with a 8000208 13% k conventional steel roll. Because the roller 1 has a certain elasticity on its outer circumference, it can cause shocks, unevenness on the side of the outer lining of the material web or change. catch in the thickness of the material web 5. This advantage counts particularly in embodiments that use gas to impart elasticity to the roller as long as the pressure in the gas is appropriate. The clamping pressure can be easily controlled by controlling the pressure of the supplied gas, which pressure can be read at 10 meters.

In contrast to the conventional steel guide roller, which cannot absorb such changes or shocks, the roller according to the invention ensures that the web of material is pressed through the roller with a pressure sufficient to apply an appropriate amount of glue without an excess is applied or the undulations are deformed. As a result, the possibility of producing material webs with defects, such as, for example, material webs with deformed undulations or poorly glued or warped material webs, is minimized, thereby increasing production. Furthermore, adjustment of the spacing between the rollers is no longer necessary depending on changes in the material, the type of the corrugation and so on. This is especially true when gas is used to impart elasticity to the rollers.

If the roller according to the invention is used as a load roller in a heating station of a corrugated fiber-plate machine, the roller 1 is also not in contact with the material web via a line mar via a surface, so that the pressure per surface unit on the material web is much smaller. will be with a conventional steel roller even if the total clamping pressure remains the same. Therefore, it is possible to increase the pressure on the corrugated fiber sheet web without undulating deformations resulting in better heat transfer, higher transport speed and greater production per unit time. Furthermore, because the roller according to the invention can absorb all kinds of irregularities in the surface of the cotton tape at the attachment points thereof and other expanded parts, the necessity to change the position of the load rollers when changing the roller rolls is also necessary. material, type of corrugation and so on after settling eliminated.

When the roller according to the invention is used as a guide roller upstream of a rotating direction D (figure 2), the material surface also beer is not in contact with the upper and lower roller via a line, but via a surface, so that the possibility of deformation of the undulations is significantly reduced. Since the contact area between the roller and the material web increases, a greater frictional force for guiding the material web can be obtained. This reduces the clamping force necessary for the rollers, thereby decreasing the possibility of deformation of the undulations. This is especially true when the material selected as the material with which the roil body is dressed is the material with a high frictional resistance.

The roller according to the invention can be used as a roller wide enough to overlap the entire width of the web or as a shorter roller covering only a portion of its total width such as an auxiliary guide roller.

Although in the foregoing preferred embodiments of the invention have been described, it will be understood that changes and variations are possible without departing from the scope of the invention.

30 0 0 2 0 8

Claims (28)

1. Roll for use in the production and processing of corrugated fiber sheets, characterized in that the outer circumference of the roll has a certain elasticity. Roller according to claim 1, characterized by a roller body and at least one flexible gas-impermeable tube mounted on the roller body such that at least partly the surface of the roller is covered, in which a pressure gas can be introduced. Roll according to claim 2, characterized in that the tube is wound spirally around the roll body. Roll according to claim 2, characterized in that a number of such tubes are wound annularly around the roll body. 15 Roller according to claim 2, characterized in that a number of such tubes are mounted on the roller body parallel to the axis of the roller body. 6. Roller according to claim 2, characterized in that a number of such tubes are mounted on the roller body at an angle to the axis of the roller body. Roller according to claim 2, 3, 4, 5 or 6, characterized in that the roller body is provided with at least one groove in its outer wall in which the tube or tubes are partially received. 8. Roll according to claim 2, 3, 4, 5, 6 or 7, characterized in that each of said tubes is provided with a gas supply opening in order to introduce the gas. A roller according to any one of claims 2, 3 * 4, 5, 0 or 7i, characterized in that the roller body is provided with a gas flow opening and connecting means for connecting this opening to each of said tubes. Roll according to claim 2, characterized in that the tube is made of natural or synthetic rubber or synthetic resin or a combination thereof and is constructed from at least one layer. 11. Roll according to claim 10, characterized in that the tube is reinforced in that textile or fiber 8000208 16 f i have been introduced into the material. Roller according to claim 1, characterized by a roller body and at least one flexible gas-impermeable pipe casing mounted on the roller body 5 and attached to each of its ends, wherein a pressure gas can be introduced into the space between said pipe casing and the roller body . 13. Roller according to claim 12, characterized in that sealing means are present for separating the space into a number of sections. 14. Roll according to claim 13, characterized in that the sealing means are provided with a number of ribs integrally formed on the inner surface of said pipe lining "with suitable mutual distance. Roller according to claim 13, characterized in that said sealing means consist of a number of bands or strands which are mounted in an annular manner on said pipe lining with suitable mutual distance. Roll according to claim 13, characterized in that the sealing means are provided with at least one band or strand which is wound spirally around said pipe lining. 25 Roller according to claim 12, 13, 14, 15 or 16, characterized in that the pipe lining is provided with a gas supply opening through which the gas can be introduced. 18. Roller according to claim 12, 13, 14, 15 or 16, characterized in that the roller body is provided with an axial gas flow passage and a number of radial passages which communicate with said axial passage in order to compress the compressed gas in each of the said sections. 35 Roll according to claim 12, characterized in that said pipe coating is made of a natural or synthetic rubber or a synthetic resin or a combination thereof and is made in at least one layer. 20. Roll according to claim 19, characterized in that said pipe lining is reinforced by wet textile material, threads or fibers or the like. 21. Roller according to claim 1, characterized by ee_. roller body and a tube cover mounted on the roller body such that the outer surface thereof is covered, which tube cover is made of synthetic resin and is provided with air bubbles. 22. Roll according to claim 1, characterized by a roll body e 'at least one elastic element in the form of a cord wrapped around the roll body such that at least part of its surface is covered. Hollow as claimed in claim 22, characterized in that the rolling frame is provided with at least one groove in its outer wall in order to partially receive said elastic element. 24 ·. Roll according to claim 22, characterized in that the elastic element is made of natural or synthetic rubber or synthetic resin or a combination thereof and is constructed in at least one layer. 25. Roll as claimed in claim 1, characterized by a roll body and at least an elastic tube coating mounted on the roll body such that at least part of the surface thereof is covered. Roller according to claim 25, characterized in that the outer surface of the elastic pipe lining is provided with an outer coating. Roll according to claim 25, characterized in that the elastic rubber coating is made of a natural or synthetic rubber or a synthetic resin or a combination thereof and is constructed in at least one layer. Roll according to claim 27, characterized in that said elastic pipe lining is reinforced in that textile or other suitable material is embedded. a *************** 8000208