JP2002544019A - Equipment for embossing or polishing flat materials - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention relates to an apparatus 1 for embossing and / or polishing fine metal paper, comprising at least one first (2) and one second (3) embossing roll. About. A flat material 6 can be supplied under pressure between the embossing rolls to create a pattern. At least one additional embossing roll 4 is connected downstream of the second embossing roll 3. The embossing roll interacts with the first (2) or preceding (3) embossing roll. The textured flat material 6 can be fed between these embossing rolls to be re-embossed with substantially the same pattern. In complex processing methods, synchronizing the embossing rolls is advantageous.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an apparatus for processing flat materials, and more particularly to an apparatus for embossing and / or calendering (glazing) foil as defined in the preamble of claim 1. Such a device is described, for example, in US Pat.
No. 07271 or U.S. Pat. No. 5,598,774. In particular, the flat material in question is a string or band, one side of which is metal (usually,
Aluminum), the support of which is made of paper or other fibrous material or foil (made of synthetic, metal or composite).

The aforementioned embossing apparatus is used, for example, in the packaging industry for embossing a packaging material and at the same time engraving symbols, patterns, and the like. In this context, the term calendering is meant to provide a finely patterned surface in the millimeter or sub-millimeter range. Such strips or sheet packaging are used, for example, as wrappers for tobacco products, cigarettes, food, chocolate, chewing gum, and the like.

[0003] The devices mentioned at the outset have been used successfully in the past, provided that the calendered foil (specifically the packaging foil) is mainly made of aluminum or mainly made of easily foldable paper. Is still used today. In the manufacture of cigarette packaging boxes, for example, these packaging materials serve for packaging the counted cigarettes and then inserting them into the box.

The following modifications have been made to embossed materials in order to be able to meet increasingly stringent environmental regulations. That is, the thickness of the metallized layer of the medium to be embossed (eg, metallized paper) is reduced, while at the same time the fibers are reinforced to such an extent that the preferred foldability is clearly degraded.

In the operation of the cited apparatus, the following has been observed: That is, the more the paper nerve fibers (streaks) of the paper being calendered have stronger fibers, the more the conventional embossing technology no longer cuts well and the folded part after the folding process However, the tendency to return to their original state, that is, the so-called memory effect is observed. Thus, insertion of a cigarette wrapping unit that is wrapped with new wrapping material does not work properly, or at times is not possible. If the embossed paper loses moisture due to improper storage, thereby further increasing the strength of the paper fibers, the aforementioned memory effect may further
Increase. For this, the individual embossing, prior to the folding process,
Heat treatment of the media and controlled humidification could counteract, but are not advantageous for food, chewing gum, cigarettes and other wrapping papers for hygienic reasons. However, it may be advantageous if the calendered paper is smoothed with the next roll.

[0006] Nevertheless, in order to be able to process such hard-to-fold media, the contact pressure of the embossing rolls used on the basis of the cited literature is sometimes higher than the standard media used previously. In comparison, it is considerably increased. However, the consequence is not only a significant reduction in the tool life of the embossing rolls, but also the cost of replacement parts, as well as the production interruption required for the required maintenance, thereby increasing the overall efficiency,
Therefore, productivity is reduced.

[0007] Parallel developments in end-customer quality inspection have made the tolerance of media supplied by papermakers much more stringent. The reason is that the embossing pressure, that is, the contact pressure of the mating roll that contacts the drive roll, is always considerably larger in order to ensure sufficient embossing even when the thickness of the medium is too uneven. Because it must be increased. Due to the higher demands on quality, the number of vendors that can be supplied has been severely limited, making the paper production of each vendor even more complicated.

In view of this known prior art, it is an object of the present invention to improve the quality of embossed and calendered products, as well as to reduce the folding properties of the processed foil by embossing pressure. To improve over the prior art without increasing the wear, and thus to improve the wear of the embossing roll. This object is achieved with a device according to claim 1.

With the solution disclosed in claim 1, surprisingly, the following has been found. That is, the presence of at least one subsequently arranged embossing roll for re-embossing of the material results in a significant reduction (eg, half) of the contact pressure.
Not only is it possible to improve the visual properties of the embossed material, but also the folding properties.

Further embodiments and refinements of the device according to the invention are described in the dependent claims. Hereinafter, the details of the present invention will be described with reference to drawings of representative examples. FIG. 1 shows a first representative example of an apparatus 1, which is an essential part, a first embossing roll 2 cooperating with a second embossing roll 3 and a next embossing roll. 4 is provided. The first embossing roll 2 is driven by a drive system 5. Also, the two rolls 3, 4 (ie the mating rolls) are not only driven by themselves, but also driven by the medium 6 without being synchronized with the driving rolls, for example by a synchronization element such as a gear. (See FIG. 2). As schematically shown in FIG. 2, the medium 6 to be embossed (for example, 0.00
A paper with a 6 mm thin metallized layer) runs vertically (ie from top to bottom in the figure).

In FIGS. 1 and 2, the embossing roll is depicted with a flat surface to show that different structures may be provided. One advantageous construction is, for example, the tooth form according to US Pat. No. 5,072,271 mentioned earlier, or an improvement according to European Patent Application No. 98811220.7.

With respect to the re-embossing process, which is not a supplemental embossing process, such that different patterns are successively embossed to produce the final pattern, it is important to note that the stable interposition The point that all embossing rolls have the same type and size of tooth profile, such that each tooth of each roll is symmetrically surrounded between the four teeth of the opposing roll.

The manufacture of designs, marks and the like, hereafter referred to as patterns, is achieved by removing or shortening the teeth at desired locations, but these engraved patterns have a single It may be formed on a roll (for example, a drive roll) or any of a plurality of different rolls. The engraving pattern of the opponent roll may be the same or different. The pattern area of the first partner roll may be slightly larger than the pattern area of the next roll or the next plurality of rolls. That is, a sharp profile is created by the next roll (or rolls).

[0014] Similar tooth forms of all cooperating embossing rolls for the re-embossing process are not limited to pyramid-shaped teeth arranged parallel and perpendicular to the longitudinal axis, but also for all Used for all types of teeth in the array.

FIGS. 1 and 2 show that the two mating rolls 3 and 4 are engaged with the driving roll 2, but this is not always the case. The second individual supplementary roll may only engage or be engagable with the first, individual preceding roll. Also, as a positive application, it would be advantageous to provide more than two embossing rolls together, in which case all of those rolls would have the same tooth profile. Moreover, the rolls may differ in any of their diameters and lengths. A soft roll may be used in addition to the embossing roll.

While the mating roll 2 is fixedly supported, at least one of the two mating rolls is free to rotate and is supported, as described in US Pat. No. 5,598,774. I have. This means that the axis of rotation of the embossing roll can be biased in any of the longitudinal direction and / or the pressure direction and / or the direction of material movement. This allows the adjustment of the rolls and the precise meshing of the teeth with one another, thus allowing a defect-free material treatment without wrinkling. This is also described in European Patent Application No. 98811220.7.

The remaining drive elements and structural details are described in the cited US Pat. No. 5,598,774, in which again the material passes vertically through the machine. FIG. 1 schematically shows a bearing and two yokes 7 each accommodating two bearings. At the same time, this indicates that the roll rotation axes may be supported individually, as a roll group or jointly.

The use of auxiliary rolls and reduced contact pressure completely eliminates the need to provide for compensating for complex deflections of the embossing rolls.

FIG. 3 is the same as FIG. 1, and corresponding parts are indicated by the same reference numerals. FIG. 3 schematically shows a tooth form, also as previously cited, where the individual teeth are truncated pyramids, but not parallel, but in the longitudinal direction of the embossing roll. Individually perpendicular to the axis, in addition, the sides of the pyramid are arranged at an arbitrary angle α (eg, 45 degrees).

The apparatus shown in FIGS. 1 to 3 applies an engraved pattern to the drive roll 2 and
This is a particularly suitable application when the two mating rolls have no engraved pattern and have only a tooth pattern. The device is also suitable where minimal or zero strain on the material is required to avoid contour blurring.

[0021] One of the embossing rolls, for example, a drive roll, and, on the other hand,
If one or both of the opponent rolls is intended to be engraved, respectively, and / or if the paper is at risk of being subjected to strong distortion between the two opponent rolls It is advantageous, and sometimes even necessary, to synchronize the roles permanently with each other. In the second example of FIG. 4 to FIG.
Are synchronized with each other by gears 13, 14, 15. The gears represent synchronizing parts as a whole and comprise electrical components and other synchronizing means known per se, such as the like.

This synchronization allows for accurate embossing in the aforementioned complex cases. Here and very importantly, the material to be embossed is pre-embossed on a first mating roll and re-embossed to eliminate most of the residual tension remaining in the media. Embossing is subsequently performed on a second mating roll.
Where possible, re-embossing is incorporated into pre-embossing, ie
If the engraved pattern is given to both the first opponent roll and the next opponent roll,
The area of the contour of the first mating roll may be somewhat wider than the next mating roll to improve the contour.

The application of the engraved pattern as well as the support of the rotating shaft, the contact of the drive roll or the mating roll with the preceding roll remains the same as in the preceding example, but the synchronization is a possibility of application. Spread out. One or both, individually, all or some of the mating rolls may have an engraved pattern that is opposite to the engraved pattern of the drive roll. That is, the drive roll may have a convex (concave) engraved pattern, and the mating roll may have a convex (concave) engraved pattern.

In addition, the embossing rolls need not be the same diameter or the same length, but, as compared to the first example, as long as the diameters or the lengths are not equal, synchronization is achieved with gears. In this case, the diameter ratio of the embossing rolls must be perfect, but the length of the embossing rolls may vary individually. FIG. 6 shows the same roll tooth form as shown in FIG.

FIG. 7 shows a tooth form having teeth 16, which have a diamond-shaped base, the sides of which are arranged in a pyramid parallel or at an angle to the longitudinal axis of the roll. Consists of Further, the teeth may be frusto-conical shaped.

[0026] Although not previously issued, reference is now made to European Patent Application No. 998125255 by the same applicant to illustrate an embossing device,
In that device, at least one embossing roll is housed in a replaceable unit that can be inserted into a bearing stand at a predetermined position.

For the device having at least three embossing rolls, a replaceable unit for individual rolls or roll groups is particularly advantageous. Because
The rationalization effect and the advantage of not harming the environment are in this case particularly important.

The above description shows that the device according to the invention has a number of advantages: 1. The paper fibers are cut in the best way and the memory effect of the paper is largely eliminated.
This is possible due to the precise positioning of the subsequent embossing rolls in operation, whereby even existing, very fine calendering patterns can be re-embossed without visible deterioration. is there. 2. The better folding behavior of the wrapping and wrapping foil allows the pre-folded and wrapped unit to be safely inserted into the box. 3. The rejection rate is reduced and therefore the efficiency of the packaging machine is improved. 4. The productivity of the packaging machine is increased due to the improved packaging and the higher production rhythm due to the performance of the operation. 5. Reduced wear of the embossing rolls, which allows for reduced spare part costs and reduced machine downtime. 6. The tolerances in paper quality inspection are expanded, thus increasing the number of available manufacturers. 7. The longer tool life, reduced rejection rate and shorter machine downtime of the embossing roll ensure environmentally friendly production. 8. The advantageous structure allows for a shorter switching between embossing patterns and between embossing rolls, thus reducing downtime of the packaging machine. 9. After the initial calendering of the paper, the manufacturing process can largely eliminate the twist of the embossed media. According to the invention, this is achieved by re-embossing the pattern. 10. The present device enables the design of an embossing machine that is an embossing roll structure that does not require correction of roll deflection.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a first embodiment of the present invention.

FIG. 2 shows a schematic cross section of the device shown in FIG. 1 with the media to be embossed.

FIG. 3 shows a second embodiment of the device of the present invention including a tuning gear.

5 shows a cross section of the device shown in FIG. 4 with the media to be embossed.

FIG. 6 shows the device shown in FIG. 4 with enlarged details of the teeth.

FIG. 7 shows the device shown in FIG. 4 with details of another enlarged tooth.

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Claims (16)

[Claims] 1. An apparatus for processing a flat material, in particular for embossing and / or polishing a foil, comprising at least one first embossing roll and at least one second embossing roll. One of these rolls is driven, and one of these rolls is free to rotate and the flat material is pressed between these rolls for texturing. A flat material processing device adapted to be passed therethrough, said second embossing roll (3) being followed by at least one further embossing roll (4), wherein said further embossing roll (4) is Cooperates with the first embossing roll (2) or the preceding embossing roll (3) and imparts substantially the same pattern in the re-embossing process. For this purpose, the patterned flat material (6) is adapted to be passed between the first embossing roll (2) and the second embossing roll (3). Flat material processing equipment. 2. An embossing roll according to claim 1, wherein said embossing roll is a synchronizing means.
2. The flat material processing apparatus according to claim 1, wherein the flat material processing apparatuses are synchronized with each other. 3. The method according to claim 1, wherein all the embossing rolls have the same tooth form (8, 16) and, in a stabilized state, each tooth (8, 16) is located between four adjacent teeth. The flat material processing apparatus according to claim 1 or 2, wherein: At least one of said freely rotating rolls (3, 4) has a longitudinal direction along its axis and / or a direction of action of said pressure;
4. Flat according to claim 1, characterized in that it is supported so as to be displaceable in the direction of movement of the material (6) to be embossed. Material processing equipment. 5. The free-rotating embossing rolls may be individually or individually.
The flat material processing apparatus according to any one of claims 1 to 4, wherein the flat material processing apparatus is supported so as to be displaceable as a roll group or jointly. 6. The flat material processing apparatus according to claim 1, wherein a pattern is formed on the driven embossing roll (2). . 7. The flat material processing apparatus according to claim 1, wherein a pattern is engraved on the embossing roll that rotates freely. 8. The embossing pressure for all free-rotating embossing rolls, such as for each embossing roll, or as a group of rolls, or together, so that the embossing pressures are the same and of different magnitudes. The flat material processing apparatus according to claim 7, wherein the flat material processing apparatus is configured to be adjusted so as to be changed. 9. An embossing pattern opposite to the engraving pattern of the embossing roll to be driven is applied to one or more of the freely rotating embossing rolls. An apparatus for processing a flat material according to any one of claims 2 to 8. 10. The flat material processing apparatus according to claim 9, wherein an engraving pattern opposite to the engraving pattern of the preceding embossing roll is provided to each free rotation roll. 11. An engraving pattern similar to the engraving pattern applied to the driven embossing roll is applied to one or more of the free-rotating embossing rolls, and the surface area thereof is The engraved pattern of the driven embossing roll is equal to or wider than the engraved pattern of the driven embossing roll.
An apparatus for processing flat material according to any one of the preceding claims. 12. The method according to claim 1, wherein the embossing rolls intended for non-synchronization have the same diameter and / or length or different diameters and / or lengths. An apparatus for processing flat material according to any one of the preceding claims. 13. The embossing rolls intended to be synchronized have not only the same or different lengths, but also have the same diameter or a diameter in which the diameter ratio between the embossing rolls is an integer. An apparatus for processing a flat material according to any one of claims 1 to 11. 14. The roll according to claim 1, wherein the freely rotating rolls can be engaged individually, as a group of rolls, or jointly with the driven embossing rolls. An apparatus for processing a flat material according to any one of the preceding claims. 15. The method according to claim 1, wherein at least one of the embossing rolls is housed in a replaceable unit that can be inserted into a bearing pedestal. Flat material processing equipment. 16. The flat material according to claim 15, wherein the embossing rolls are arranged individually, as a roll group or jointly in a replaceable unit. Processing equipment.