Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/08—Filter paper
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
  • A24D1/02—Cigars; Cigarettes with special covers
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/02—Manufacture of tobacco smoke filters
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/061—Use of materials for tobacco smoke filters containing additives entrapped within capsules, sponge-like material or the like, for further release upon smoking
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
  • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
  • D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/24—Polysaccharides
  • D21H17/28—Starch
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/24—Polysaccharides
  • D21H17/30—Alginic acid or alginates
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/24—Polysaccharides
  • D21H17/31—Gums

Definitions

• the present invention is in the field of papermaking for smoking articles. More particularly, it relates to a filter wrapper paper for a smoking article, a method of making the same, and a smoking article using such filter wrapper paper.
• a commercial filter cigarette consists of a cylindrical, round or oval tobacco rod wrapped in a cigarette paper, a similarly shaped filter plug surrounded by a filter wrap paper, and a tipping paper usually coated with the entire filter wrap paper and a portion of the tobacco rod Cigarette paper is bonded, and so connects the filter plug with the tobacco rod.
• the filter plug itself can be made of various materials, often cellulose acetate fibers, sometimes in combination with activated carbon particles used.
• the filter wrapper enveloping the filter plug is typically adhered in one or more narrow web-shaped areas to the surface of the filter plug which typically extends along a direction parallel to the axis of symmetry of the filter plug.
• the filter wrapper paper is usually adhered to itself along a narrow seam to prevent bursting of the filter plug.
• a variety of different adhesives is used in the prior art, but often polyvinyl acetate or hot melt adhesives are used.
• Typical filter wrap papers in the range of relatively low and medium air permeabilities consist of wood pulp using a mixture of long or short fibers depending on the desired properties of the paper. Further, these papers typically contain mineral fillers, such as calcium carbonate, kaolin, talc, titanium dioxide or other mineral fillers, and mixtures thereof. Additionally or alternatively, other additives may be provided to achieve specific properties, such as wet strength agents.
• fillers such as calcium carbonate, sodium acetate and magnesium carbonate are used.
• magnesium oxide as a second filler calcium carbonate is called for the production of a tobacco packaging paper.
• Another example of the use of a filler is the patent DD 145863 A3 , in which mainly calcium carbonate serves as filler for a cigarette paper.
• filter wrapper paper is done on paper machines, for example, on fourdrinier machines.
• the pulp fibers used for papermaking are usually distinguished into long and short fibers, with long fibers typically being pulp fibers of softwoods, such as spruce or pine, with a length of more than 2 mm, while the short fibers of hardwoods, such as birch, Beech or eucalyptus are derived and typically have a length of less than 2 mm, often about 1 mm.
• the pulp is suspended in water and then ground in a milling unit, a so-called refiner. It is common for short and long fibers to be ground separately.
• the intensity with which the pulp was ground is determined by measuring the degree of grinding, for example according to ISO 5267 (Pulps: Determination of drainability - Part 1: Schopper-Riegler method). The result of this measurement is given in degrees according to Schopper-Riegler (° SR).
• ° SR Schopper-Riegler
• long fiber pulp is ground for use in filter wrap papers to a freeness of 50-70 ° SR.
• Short fiber pulp is usually ground much less strongly and reaches a freeness of 15 ° SR to 40 ° SR. The grinding of short fiber pulps can be completely eliminated.
• degrees of grinding which are used for the production of a paper for filter wrap or for connection of filter and cigarette part, give the patent applications EP 0758695 A2 and EP 0758532 A2 , For fiber lengths of 0.8 to 2 mm grinding degrees used between 14 ° SR and 72 ° SR.
• cellulose ester fibers having typical fiber lengths of 3 to 7 mm with a freeness of 30 to 60 ° SR are ground to produce a layer which is rolled up into a tobacco filter.
• grinding degrees are described in the patents EP 03752844 A2 and DD 145863 A3 for filter wrapping paper or tipping paper, in which grinding degrees between 92 ° SR and 94 ° SR and between 91 ° SR and 92 ° SR are used.
• the fiber-filler suspension from the headbox of the paper machine flows to the wire and can be dewatered there by various means, for example by gravity or Vacuum. Thereafter, the wet fiber network can pass through the press section where it is dried by mechanical pressure against a dry felt. Finally, the fiber network can still pass through the dryer section where it is dried by contact with cylinders, for example steam heated cylinders. Then the finished paper can be rolled up. There may be carried out further processing steps in the paper machine, for example, a sizing in a glue or film press, the application of watermarks, embossing, impregnation, etc.
• fillers such as calcium carbonate, kaolin, talc, titanium dioxide or other mineral fillers or mixtures thereof.
• the finished filter wrapper paper is then usually in the form of a roll, with a width corresponding to the width of the paper machine.
• This role is then usually cut into narrower roles, so-called bobbins, the width of which depends on the circumference of the filter plug and the desired width of the seam.
• a typical bobbin is about 5000 to 6000 m long and 25 to 27 mm wide. Significant deviations in length and width of the Bobine are possible to adapt to the wide range of commercial cigarette filters. It is also common that the width of a reel is about an integer multiple of the width needed to make a filter plug since filter making machines can make several, typically two, filter strands in parallel at a time.
• one or more capsules which can be destroyed by mechanical pressure are introduced into the filter plugs.
• These capsules contain a liquid, usually an oil, with flavorings, such as menthol.
• the smoker thus has the option of destroying this capsule (s) by pressure on the filter plug, for example with the fingers, and thus releasing the aroma substances.
• the released flavors then aromatize the smoke flowing through the filter plug and exiting from the mouth end of the cigarette so that the smoker can perceive the flavors.
• the smoker can control the taste of the cigarette by destroying the capsules.
• Such a filter cigarette is for example in US 2008/142028 described.
• the liquid emanating from the destroyed capsules has a tendency to penetrate through the filter wrapping paper as well as through the tipping paper, so that stains are visible on the outside of the cigarette. These stains are noticeable to the smoker and affect the visual appearance of the cigarette.
• Such stains can be prevented by providing the filter wrapper with some barrier to oil.
• the ability of a paper to form a barrier to oil hereafter also referred to as "oil resistance” can be determined using a Tappi T559 cm-02 "Grease Resistance Test for Paper and Paperboard” test, which is customary in the paper and paper industry , In this test, drops of 12 different test fluids sorted in ascending order of wettability are applied to the paper applied, and it is determined which of the liquids penetrates to the other side of the paper. The result of the test is the so-called KIT level, which describes in which of the test fluid the breakdown to the other side of the paper has occurred for the first time.
• One way to give the paper such a barrier function against oil or "oil resistance” is to coat the filter paper with fluorinated hydrocarbons, which give the paper oil-repellent properties.
• fluorinated hydrocarbons are commonly used in paper food packaging, but are not approved for use in cigarettes in many countries.
• the coating may complicate the bonding of the filter wrapper paper.
• this ratio would correspond to an order of typically significantly more than 2 g / m 2 .
• the energy required for drying would be increased unfavorably.
• CA 2467601 Also in CA 2467601 is the order of starch products to achieve oil resistance described.
• a composition consisting of a modified starch, an agent for increasing the mechanical flexibility, such as glycol, and a means for adjusting the rheological behavior may improve the mechanical flexibility of the coating, it also requires, according to this patent, an order of more than 75 kg of this composition per Ton of paper to ensure adequate oil resistance. Therefore, the material used and the associated costs for material and energy for drying the paper are comparatively high here as well.
• the effect could only be demonstrated for papers with a basis weight of more than 37 g / m 2 , which corresponds to an order of at least 2.78 g / m 2 .
• it is by no means obvious that the effect described in this patent can be easily transferred to filter wrapping papers with a much lower basis weight.
• the use of glycols in papers for the cigarette is not allowed.
• filter wrap papers which are generally much lighter and thinner than food packaging papers, higher order quantities of starch products are required from the outset in relation to the pulp, since the papers offer less resistance to the oil by itself because of their low basis weight and small thickness, and because due to the low basis weight of the order per weight unit of the filter wrapper paper takes place on a comparatively much larger area.
• the invention has for its object to provide a filter wrapper available, which can be produced at low cost and yet has sufficient resistance to oil and has favorable mechanical properties for further processing.
• the inventors have found that the combination of these features produces a filter wrapper having a Tappi T559 cm-02 KIT level of at least 4, typically even 5 or more. This is true even if the filter paper as the starting material, that is still without impregnation, a very low basis weight of 15-35 g / m 2 .
• the filter paper according to the invention allows a sufficient oil resistance at comparatively low basis weights of 15 to 35 g / m 2 , based on the starting material without impregnation. Preference is given to papers whose basis weight before impregnation is 20-30 g / m 2 , particularly preferably 20-25 g / m 2 .
• Such filter paper may have an average air permeability according to ISO 2965 of less than 12,000 cm 3 / (cm 2 min kPa), preferably less than 8,000 cm 3 / (cm 2 min kPa).
• the effect according to the invention can also be achieved with filter papers having a higher basis weight. However, with filter papers above 35 g / m 2, it is also possible in other conventional ways to produce sufficient oil resistance, unlike in the preferred range here, for which the prior art to the knowledge of the inventors does not yet provide a truly satisfactory solution provides.
• Preferred ranges for the finished filter wrapper paper are 15.5-24.0 g / m 2 , preferably 20.5-39.0 g / m 2, and more preferably 20.5-34.0 g / m 2 .
• the appropriate amount of application of the impregnating material may be determined experimentally to give the desired oil resistance.
• the contribution of the material for impregnation to the basis weight of the finished filter paper is 0.5-3.0 g / m 2 , preferably 1.0-2.5 g / m 2 , and more preferably 1.3-2.0 g / m 2 .
• the filter wrapper paper of the invention is impregnated with a material suitable for forming an aqueous composition, in particular an aqueous solution or suspension.
• a material suitable for forming an aqueous composition in particular an aqueous solution or suspension.
• This aqueous solution or suspension may then be used in the impregnation to introduce the material into the paper while the water component evaporates or vaporizes after impregnation.
• a starch or a starch derivative preferably a hydrolyzed starch, in particular maltodextrin.
• the invention is not limited to these materials. Instead, one or more of the following substances may be used for the impregnation material: gelatin, shellac, collodium, gum arabic, agar-agar, tragacanth, locust bean gum, guar gum, carboxymethyl starch, alginic acid and its salts, especially sodium, potassium and potassium salts Calcium alginates, or a cellulose derivative, especially methyl cellulose or carboxymethyl cellulose and their sodium, potassium, calcium or magnesium compounds.
• fillers are chosen to be relatively low. Nevertheless, fillers, albeit in a relatively smaller proportion, may be present, which are preferably mineral fillers, in particular calcium carbonate, kaolin, talc, titanium dioxide or a mixture of two or more of these fillers.
• the oil resistance can be further increased if necessary by: a further layer of material is applied, in particular printed or sprayed on.
• This additional material layer can basically be applied to each of the two sides of the filter wrapper paper. Preferably, however, it is applied at least on the side facing the filter plug in use.
• the optional further application of material is essentially limited to the surface of the already impregnated paper, and is therefore also referred to herein as a "coating".
• the contribution of the further material layer to the basis weight of the finished filter wrapper paper in the treated area is 1.0-6.0 g / m 2 , preferably 2.0-4.0 g / m 2 .
• the restriction "in the treated area" indicates that the entire surface of the filter wrap paper does not necessarily need to be coated with the other material. This is the case in particular in the applications described in more detail below, in which the further material coating primarily serves to provide a self-adhesive effect.
• the material of the further material layer is also preferably suitable for forming an aqueous composition, in particular an aqueous solution or suspension.
• Oxidized starch has proved to be particularly advantageous. However, all of the materials mentioned above in connection with the impregnation come into consideration.
• the material of the impregnation and / or the material of the further material layer is preferably suitable, after its moistening, to bond the filter wrapping paper to itself, a filter plug and / or a tipping paper without further adhesive.
• the impregnation and the optional further coating not only serves to increase the oil resistance, but they give the filter wrapper paper as a particular further advantage a self-adhesive effect.
• the material of the impregnation or the further coating must only be wetted and thus dissolved, whereupon it can be glued to another section of the filter wrap paper, the filter plug or a Tippingpapier.
• This self-adhesive effect can be generated by the impregnation itself, but is reinforced by the further material coating. If the impregnation alone is sufficient to produce the oil resistance, the application of the further material, ie the coating, can be limited to those selected areas serving as splices when the filter wrap paper is adhered to itself, the filter plug or a tipping paper.
• a precursor paper having the above features (i) and (ii) is first prepared. Thereafter, the precursor paper is impregnated with a suitable material in an aqueous composition, in particular an aqueous solution or suspension. This impregnation can take place, for example, in the size press of a paper machine. Alternatively, the impregnation can be carried out by two-sided application of the aqueous composition in a film press of a paper machine or by two-sided roller application.
• the filter wrapper paper can optionally be optionally coated with additional material.
• the gravure printing method is preferred.
• Further suitable application methods are flexographic printing, spraying or application by means of a film press or a roller. Characteristic here is that the material is applied to the surface and not, as in the impregnation example in the size press, is introduced into the paper structure.
• filter wrap papers were produced having a basis weight of about 23 g / m 2 , comprising about 60% long fiber pulp and about 40% short fiber pulp, both percentages based on the pure pulp, and a 0-10% variable filler content, based on total pulp ,
• the filler used was precipitated calcium carbonate (PCC).
• Impregnation of the papers was carried out in the size press of the paper machine with a 10-15% aqueous suspension of a short-chain hydrolysed starch (maltodextrin Eliane MD2 from Avebe, obtainable for example from Brenntag CEE GmbH), so that in the paper structure after drying The paper remained about 1-2 g of this thickness per square meter of paper, which is hereinafter also referred to as "order quantity", although this is strictly speaking not an "order" in terms of a coating, but an impregnation. Unless otherwise specified, all percentages are by weight.
• the amount of starch added in the paper by the impregnation was determined as the difference in basis weight determined before and after the impregnation according to ISO 536.
• Table 1 Oil resistance of conventional, modified and coated filter wrap papers Filterhüllpapier impregnation oil resistance No. Long fiber pulp grinding Filler content [%] Starch suspension [%] Order quantity [g / m 2 ] KIT-Level 1 normal 10 None 0 ⁇ 1 2 Intensive 10 None 0 ⁇ 1 3 normal 0 None 0 1 4 Intensive 0 None 0 1-2 5 normal 10 12 1.5 ⁇ 1 6 Intensive 10 12 1.5 ⁇ 1 7 normal 0 12 1.5 1-2 8th Intensive 0 10 1.2 5-6
• Example 1 describes a conventional filter wrapper paper, showing that conventional filter wrapper papers do not have sufficient oil resistance.
• Example 2 the long fiber pulp was ground intensively, resulting in a denser paper structure. Nevertheless, no improvement in oil resistance could be achieved.
• Example 3 no filler was used. This measure also leads to a denser paper structure, but also does not improve oil resistance.
• Example 4 shows that even the combination of highly ground long-fiber pulp and the absence of filler does not achieve a sufficient improvement in oil resistance.
• Examples 5-7 show the same papers as in Examples 1-3, but with an additional impregnation by the starch suspension. Although the amount of the order of starch is about the same amount as in WO 2008/100688 or CA 2467601 is proposed and thus at least a small improvement in oil resistance would have been expected, this can not be confirmed experimentally.
• Example 8 a KIT level of 5-6 can already be achieved by impregnation with only 1.2 g of starch per square meter of paper, whereas impregnation with 1.5 g of starch per square meter of paper in Examples 5-7 does not causes significant improvement.
• the basis weight here refers to the weight per unit area of the filter wrap paper before impregnation, which is also referred to below as "initial basis weight”. Even over a starting basis weight of 35 g / m 2 , the described effect is achieved, however, other known methods for achieving oil resistance can be used for such papers.
• the content of highly ground long fiber pulp is varied at constant fiber weight.
• increasing oil resistance is seen to increase the content of long fiber pulp since the highly ground long fiber pulp contributes to a denser paper structure.
• the content of long-fiber pulp based on the total fiber mass of the paper, should be at least 30%, preferably at least 40%. There is basically nothing against using up to 100% long-fiber pulp.
• the benefits in oil resistance at very high levels of long fiber pulp no longer increase to the same extent like at low levels. Since long-fiber pulp is usually more expensive than short-fiber pulp and the grinding is associated with energy costs, resulting in an ideal for each application proportion of long-fiber pulp, inter alia, for economic reasons.
• an effect occurs from a freeness of about 80 ° SR, but is preferably the range of 85 ° SR to 95 ° SR.
• An upper limit for the freeness of the long-fiber pulp is set at 100 ° SR.
• the filler content (here precipitated calcium carbonate) is varied in the filter wrap paper.
• An increasing content of calcium carbonate or similar fillers loosens the paper structure and deteriorates the oil resistance, so that the content of calcium carbonate, as is concluded from Example 6, in any case less than 10%, but preferably less than 8% and more preferably less than 6 % will choose. It is also possible to completely dispense with filler.
• calcium carbonate is less expensive than pulp, but on the other hand, with higher filler content, it may be necessary to use more starch in the impregnation in order to achieve sufficient oil resistance, the concrete choice of filler content - within the limits defined here - not least for economic reasons.
• the amount of starch applied to the paper in the impregnation can be varied. Increasing the amount of application shows increasing oil resistance, but, just as with the content of long-fiber pulp, the improvement in oil resistance does not increase to the same extent at relatively high application rates as at low levels.
• Application quantities of 0.5 g / m 2 to 3 g / m 2 have proved to be suitable, preferably those of between 1.0 g / m 2 and 2.5 g / m 2 , more preferably between 1.3 g / m 2 and 2.0 g / m 2 .
• the invention can also be achieved by impregnation with other water-based compositions, such as, for example, solutions or suspensions.
• starch for example, gelatin, Shellac, collodium, gum arabic, agar-agar, tragacanth, locust bean gum, guar gum
• starch and starch derivatives such as carboxymethyl starch, or alginic acid and its salts, in particular sodium, potassium, and calcium alginates
• cellulose derivatives such as methyl cellulose or carboxymethyl cellulose and their sodium, potassium, calcium or magnesium compounds. Mixtures containing one or more of these substances may also be used.
• the legal provisions must also be taken into account.
• aqueous composition may contain a starch or a starch derivative, which may also be the same as that used for impregnation.
• a starch or a starch derivative which may also be the same as that used for impregnation.
• one will choose another substance or a mixture of substances which can be used better in the selected application process, for example because of the requirements for the rheological behavior.
• a comparable effect can also be achieved, for example, with gelatin, shellac, collodium, gum arabic, agar-agar, tragacanth, locust bean gum, guar gum, also with starch and starch derivatives, such as carboxymethyl starch, or with alginic acid and its salts, in particular sodium, potassium , and calcium alginates, as well as with cellulose derivatives, such as methylcellulose or carboxymethylcellulose and their sodium, potassium, calcium or magnesium compounds.
• starch and starch derivatives such as carboxymethyl starch, or with alginic acid and its salts, in particular sodium, potassium , and calcium alginates, as well as with cellulose derivatives, such as methylcellulose or carboxymethylcellulose and their sodium, potassium, calcium or magnesium compounds.
• the amount of solids of the aqueous composition applied in the intaglio printing process in addition to the above-mentioned impregnation brings about detectable effects in the range from 1.0 to 6.0 g / m 2 printed area, but the range from 2.0 to 4.0 g / l is preferred. m 2 printed area.
• the stated application amounts refer to the dried paper, ie after the water of the applied aqueous composition has evaporated or evaporated. It is also to be expected with other application methods that with an applied amount of 1.0-6.0 g / m 2 and preferably 2.0-4.0 g / m 2 an effect which is at least approximately comparable to the gravure printing method can be achieved the oil resistance obviously depends more on the order quantity than on the type of application method.
• Both the impregnation alone and in combination with the additional application to the surface (“coating”) make it possible to obtain a filter wrapping paper which can be bonded to itself or to the filter plug without the need for further adhesives. Instead, it is sufficient to first apply a small amount of water to the surface of the paper in a partial area or over the entire area.
• the water may preferably be usual power water, also deionized water is possible.
• the temperature of the water is also not particularly relevant for the bonding, it will preferably be in a range of 15 ° C to 60 ° C.
• the surface wetted with water with the surface to be bonded under slight mechanical pressure to bring into contact and a short time preferably at elevated temperature, for example, about 60 ° C to dry.
• elevated temperature for example, about 60 ° C to dry.
• temperatures which allow rapid drying preferably above 40 ° C., particularly preferably above 50 ° C.
• the temperature should not be so high that it comes to a thermal decomposition of the paper, so it should be below 105 ° C, preferably below 90 ° C in any case.
• the bond reaches a certain minimum strength very quickly, so that the filter does not burst in the further processing steps or the filter paper dissolves from the filter.
• the bonding takes place in such a way that the adhesive seam is approximately 2 mm wide and lies in the machine direction of the filter paper. Where the filter wrapping paper is glued to itself, the bonding between the top and the wire side of the filter wrap paper takes place.
• each of the papers of Examples 10, 11, 14 and 22 was tested for adhesiveness.
• the papers from Examples 11 and 14 were chosen because they higher because of the higher basis weight or because of the higher proportion of long fiber pulp Have tensile strength.
• first two strips of paper 15 mm wide in the machine direction and sufficiently long in the transverse direction for a tensile strength measurement according to ISO 1924-2 were prepared. Water was applied to the top of the first strip with a brush along a straight line about 2 mm wide in the machine direction of the paper, ie parallel to the short side of the strip. Thereafter, the paper strip was brought into contact with the screen side of the second strip such that a 15 mm wide but now longer, straight strip resulted from the bonding of the two strips.
• the splice was loaded with a flat metal body heated to a temperature of about 60 ° C by manual pressure for about 1 second.
• the glued paper strip was subjected to a tensile test in accordance with ISO 1924-2.
• the paper strip is clamped at both ends and stretched until it breaks. In the experiments it was observed whether the tear occurred at the tack or at another location of the paper strip. Four strips were tested per paper.
• composition intended for application to the surface or "coating" should not be applied over the whole area but only in some areas .
• These sections can have any shape per se, but will depend on the shape of the surface to be bonded.
• These subregions are preferably designed in their shape, as it previously corresponds to the areas of the filter wrapper paper provided with adhesive in the filter production.
• composition is typically and preferably applied in partial regions on the side of the paper facing the filter plug. But it is also conceivable, these sections provided on the other side of the paper or on both sides of the paper, for example, if additional bonding of the filter wrapper paper with the tipping paper is to be achieved in a later step of cigarette production.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Paper (AREA)
• Cigarettes, Filters, And Manufacturing Of Filters (AREA)
• Filtering Materials (AREA)

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Publications (2)

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• 2011
  • 2011-07-28 ES ES11175809T patent/ES2421621T3/es active Active
  • 2011-07-28 PL PL11175809T patent/PL2551407T3/pl unknown
  • 2011-07-28 EP EP11175809.0A patent/EP2551407B1/de active Active
• 2012
  • 2012-07-16 BR BR112013032652-2A patent/BR112013032652B1/pt active IP Right Grant
  • 2012-07-16 KR KR1020147001913A patent/KR20140051910A/ko not_active Application Discontinuation
  • 2012-07-16 WO PCT/EP2012/002985 patent/WO2013013786A1/de active Application Filing
  • 2012-07-16 CN CN201280036943.9A patent/CN103717803B/zh active Active
  • 2012-07-16 JP JP2014521977A patent/JP2014525995A/ja not_active Withdrawn
  • 2012-07-16 MY MYPI2013004526A patent/MY159314A/en unknown
• 2014
  • 2014-01-28 US US14/165,629 patent/US8939155B2/en active Active
  • 2014-11-10 US US14/536,973 patent/US9115471B2/en active Active

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