The present invention pertains to a method of manufacturing a smoking article with embossed tipping paper, to smoking articles such as cigarettes, double-cigarettes, disposable tobacco sticks and similar, to embossing rollers used in manufacturing embossed tipping paper for smoking articles and a manufacturing system for manufacturing smoking articles with embossed tipping paper.
For smoking articles containing herbal smoking material such as tobacco, envelope papers are wrapped in one or more layers around the various components of the smoking articles to mechanically hold them in place. Such envelope papers are usually made of a special paper grade for industrial production obtained from chemical pulp as paper of high quality, ensuring inter alia appropriate tensile and tearing strength, low air permeability, enough control of burning speed, enough opacity, optimal runnability and good edge quality.
The envelope paper used to establish a mechanical connection between the plug wrap paper wrapped around the filter material and the cigarette tissue is commonly referred to as tipping paper—an envelope paper of higher basis weight than the plug wrap paper. In order to enhance the visual and tactile appearance of smoking articles overall, embossing techniques such as printing or stamping may be used to set a relief or counter-relief pattern into the tipping paper. Embossed patterns give the tipping paper a unique and aesthetically pleasing visual appearance and a comfortable feel in a user's hands or at a user's lips, thereby increasing the perceived quality of the smoking article. For example, document CN 201 339 146 Y discloses embossed tipping paper.
When using embossed tipping paper to manufacture smoking articles, it is desirable for the relief pattern formed on the tipping paper not to interfere with or negatively impact the performance of subsequent manufacturing stages. Document EP 0 536 407 A1, for example, discloses a tipping paper used for a cigarette with which the variation in the amount of air flow from a vented filter can be reduced through provision of ventilation holes in the embossed region of the tipping paper only.
However, improved solutions for the manufacturing of embossed tipping papers for smoking articles are needed.
Therefore, according to an aspect of the present invention an embossed tipping paper includes a relief pattern region having a patterned embossing structure formed in the depth of the material of the tipping paper. The embossed tipping paper further includes at least one plain region adjacent to the relief pattern region, the at least one plain region not having an embossing structure formed in the depth of the material of the tipping paper. A sequence, i.e. a plurality, of ventilation holes is formed in the at least one plain region. The embossed tipping paper has a substantially rectangular shape and the at least one plain region forms a band of fixed width running between two parallel edges of the substantially rectangular shape.
According to a further aspect of the invention, a method for manufacturing smoking articles with embossed tipping paper involves the steps of forming a patterned embossing structure in the depth of the material of the tipping paper, omitting at least one plain region adjacent to the relief pattern region during formation of the patterned embossing structure in the depth of the material of the tipping paper, and forming a sequence of ventilation holes in the at least one plain region of the tipping paper. This way, the tipping paper includes a relief pattern region with a patterned embossing structure and at least one plain region not having a patterned embossing structure. The embossed tipping paper has a substantially rectangular shape and the at least one plain region forms a band of fixed width running between two parallel edges of the substantially rectangular shape.
A further aspect of the invention pertains to an embossing roller used for embossing tipping paper for smoking articles, the embossing roller including an engraving pattern on the roller surface, the engraving pattern configured to form a relief pattern region having a patterned embossing structure in the depth of the material of the tipping paper, and at least one plain area on the roller surface adjacent to the engraving pattern, the at least one plain area configured to form at least one plain region adjacent to the relief pattern region, the at least one plain region not having an embossing structure formed in the depth of the material of the tipping paper. The at least one plain area forms a band of fixed width running through the engraving pattern in parallel to the circumference of the embossing roller.
According to a further aspect of the invention, a manufacturing system for manufacturing smoking articles with embossed tipping paper includes an embossing roller in line with an aspect of the invention.
Yet another aspect of the invention pertains to a smoking article having embossed tipping paper according to one of the aspects of the invention. The smoking article may in particular be one of a cigarette, a double cigarette, a cigarette cartridge, a disposable tobacco stick and a double disposable tobacco stick for use in heat-not-burn products. The embossed tipping paper of the smoking article is wrapped around a filter plug of the smoking article. The smoking articles may further comprise a plug wrap, typically made from porous or non-porous paper, that is wrapped around the filter plug beneath the embossed tipping paper. The embossed tipping paper may in particular have a higher basis weight than the paper of such a plug wrap.
One idea of the invention is to selectively spare out certain regions of a tipping paper for smoking articles during an embossing step so that not the whole tipping paper is covered with a relief or counter-relief pattern. Such only partially embossed tipping papers may present advantageous properties in subsequent processing steps for the smoking articles, for example separating smoking articles in the region of the filter plugs or forming ventilation holes in the tipping paper for ventilating the filter plugs.
Specifically, the dedicatedly spared out regions, i.e. the regions of the tipping paper which are not embossed with a relief or counter-relief pattern, may allow for more precise processing of the smoking articles in those regions. For example, separating smoking articles in unembossed regions of the filter plugs may avoid the appearance of hairy paper pulp that would otherwise occur due to the uneven distribution of tipping paper thickness when the tipping paper would be embossed in the area where the separation cut is introduced in the filter plug. In other examples, forming ventilation holes by means of laser irradiation in the tipping paper may be made with higher precision since keeping the focus of the laser beam in the plane of the tipping paper is easier when the tipping taper does not have dimples, grooves or rugged surface areas as it would be the case if the tipping paper would be embossed in the region where ventilation holes are to be formed by laser-cutting.
According to an embodiment of the embossed tipping paper, the fixed width of the at least one plain region may be at least 1 mm, particularly at least 2 mm. This ensures enough space between embossed areas for operations being performed on the smoking article after the embossed tipping paper is wrapped around a filter plug of the smoking article.
According to another embodiment of the embossed tipping paper, the embossed tipping paper may comprise at least two plain regions adjacent to the relief pattern region, the at least two plain regions not having an embossing structure formed in the depth of the material of the tipping paper and running in parallel to each other between two parallel edges of the substantially rectangular shape of the embossed tipping paper. In some of those embodiments, a first of the at least two plain regions may be formed substantially at a side edge of the substantially rectangular shape of the embossed tipping paper. In alternative embodiments, both of the at least two plain regions may be formed substantially in the middle of the substantially rectangular shape of the embossed tipping paper. In some variations of the embodiments, it may be possible that a first of the at least two plain regions is formed substantially at a side edge of the substantially rectangular shape of the embossed tipping paper, and a second of the at least two plain regions is formed substantially in the middle of the substantially rectangular shape of the embossed tipping paper.
According to another embodiment of the embossed tipping paper, the patterned embossing structure may be formed to a depth of more than 45 μm of the material of the tipping paper.
The embossed tipping paper comprises a sequence of ventilation holes formed in the at least one plain region of the tipping paper. In some embodiments thereof, the sequence of ventilation holes may be a linear arrangement of a series of ventilation holes running in parallel to the band of fixed width in the middle of the at least one plain region. Such ventilation holes may be useful for controlling TNCO parameters of the smoking articles. Advantageously, forming the sequence of ventilation holes in a plain, i.e. non-embossed region of the embossed tipping paper allows better control of the cutting precision. For example, if laser cutting is used to form the ventilation holes, the laser beam may be focused more precisely on the surface of the tipping paper, if the tipping paper does not have a relief pattern structure in the area of the laser beam.
The method for manufacturing smoking articles with embossed tipping paper comprises a step of forming a sequence of ventilation holes in the at least one plain region of the tipping paper, for example using laser cutting. Such a sequence of ventilation holes may in some embodiments thereof be formed as a linear arrangement of a series of ventilation holes running in parallel to the band of fixed width in the middle of the at least one plain region.
According to another embodiment of the method for manufacturing smoking articles with embossed tipping paper, the method may further comprise a step of separating two portions of the embossed tipping paper along the middle line of the band forming the at least one plain region. This may in particular be useful for double cigarettes which are separated into single cigarettes in the middle of the filter plug. Cutting along a plain region, i.e. a non-embossed region of the tipping paper yields a cleaner cut edge than cutting along an embossed region.
The invention will be explained in greater detail with reference to exemplary embodiments depicted in the drawings in which:
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention.
The smoking article S is shown in
The tipping paper T used for overwrapping the plug wrap W and attaching the tobacco rod F to the filter plug P may be partially embossed. Possible variations for the embossing patterns formed on the tipping paper T are exemplarily shown in
The tipping paper T depicted in
The embossing structure may in particular have sunk or counter-sunk portions in the depth of the material of the tipping paper that follow the respective repeating arrangement of shapes and lines. The patterned embossing structure may be formed to a depth of more than 45 μm of the material of the tipping paper T, i.e. the difference in height between a depressed area and a heightened area of the patterned embossing structure may be more than 45 μm, for example up to 90 μm.
The relief pattern region R itself may be bordering directly on one or more edges of the substantially rectangular shape, such as for example the side edges s1, s3 and s4. The relief pattern region R is formed that is does not cover the whole surface of the tipping paper T. Instead, at least one plain region is formed adjacent to the relief pattern region R. The at least one plain region does not have an embossing structure formed in the depth of the material of the tipping paper T, i.e. the material of the tipping paper has not been subject to an embossing operation in those plain regions.
As shown in
As illustrated in
As illustrated in
Of course, and as shown in conjunction with
A possible implementation of an embossing roller 4 that may be used to emboss tipping paper in a manufacturing system for smoking articles is exemplarily depicted in
For example, first and second plain areas 6a, 6c may be implemented off-centre of the middle line around the circumference of the embossing roller 4. Those first and second plain areas 6a, 6c may be used to spare out plain regions E2 as shown in
The axial length of the embossing roller 4 may be about the same as the desired length of the horizontal side edges s2 and s4 of tipping paper T to be embossed. The circumference of the embossing roller 4 may have the same value as the desired length of the vertical side edges s1 and s3 of tipping paper T to be embossed.
The embossing roller 4 may be provided with a plain counter-roller in a manufacturing system for smoking articles. An endless supply of tipping paper base web having a breadth corresponding to the length of the horizontal side edges s2 and s4 may be wound up on a bobbin. The base web may be provided from the bobbin to an assembly of tension, guidance and registering rollers in order to feed the tipping paper base web between an embossing roller 4 and the corresponding counter-roller. The embossing roller then engraves the relief pattern regions in an endless fashion on the tipping paper base web. After the engraving operation, the tipping paper base web is cut in intervals perpendicular to the direction of travel of the base web in order to separate the base web into rectangularly shaped pieces of partially embossed tipping paper T. The intervals may correspond to a desired breadth of the embossed tipping paper T, i.e. the length of the vertical side edges s2 and s4.
Due to the engraving pattern 5 being interrupted by one or more bands of plain areas 6a, 6b, 6c on the roller surface 7 of the embossing roller 4, the resulting pieces of partially embossed tipping paper T will substantially have the appearance as depicted in
The partially embossed tipping paper T that has run through the manufacturing system using the embossing roller 4 and a corresponding counter-roller may then be used in subsequent stages of the manufacturing system to wrap filter plugs P, for example filter plugs of double cigarettes or double disposable tobacco sticks.
While there is a specific example with three plain areas 6a, 6b and 6c shown in
The perforation drum 1 and one or more tension rollers 2 may be used in the system of
In a first step M1, a patterned embossing structure is formed in the depth of the material of the tipping paper T to form a relief pattern region R. In a second step M2, at least one plain region adjacent to the relief pattern region R is omitted during formation of the patterned embossing structure in the depth of the material of the tipping paper T. That way the tipping paper T, after embossing, includes a relief pattern region R with a patterned embossing structure and at least one plain region not having a patterned embossing structure. The embossing operation is performed on tipping paper T having a substantially rectangular shape such that at least one plain region forms a band of fixed width running between two parallel edges of the substantially rectangular shape.
Optionally, a step M3 may involves forming a sequence of ventilation holes V in the at least one plain region of the tipping paper T, for example as a linear arrangement of a series of ventilation holes running in parallel to the band of fixed width in the middle of the at least one plain region. The forming of ventilation holes V may for example be performed using laser cutting.
Optionally, a step M4 may involve separating two portions of the embossed tipping paper T along the middle line of the band forming the at least one plain region. This may in particular include separating a double cigarette in two single cigarettes in the middle of the common filter plug. The separating cut is in this case set in a plain region in the middle of the tipping paper T.
In the foregoing detailed description, various features are grouped together in one or more examples or examples with the purpose of streamlining the disclosure. It is to be understood that the above description is intended to be illustrative, and not restrictive. It is intended to cover all alternatives, modifications and equivalents. Many other examples will be apparent to one skilled in the art upon reviewing the above specification.
Number | Date | Country | Kind |
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18215156.3 | Dec 2018 | EP | regional |
The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/EP2019/084064, filed Dec. 6, 2019, published in English, which claims priority to European Application No. 18215156.3 filed Dec. 21, 2018, the disclosures of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2019/084064 | 12/6/2019 | WO | 00 |