DE2037462A1 - - Google Patents

Description

Ml / VS July 28, 1970

Company SNIA VISCOSA SOCIETA ¹ NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA, 18, Via Montebellö, MILAN / Italy

Highly porous paper, especially cigarette paper

The invention relates to papermaking for the well-known tubular sleeves or rolls for cigarettes, as well as any cigarette paper sheets for a hand-made cigarette or for an equivalent Use.

It is well known that such paper must have very specific properties and must therefore also have certain manufacturing and conditions of use, either from a health point of view or from a point of view a rational and complete combustion of the tobacco contained in the paper tubes concerned. By this Properties are briefly indicated, must be visualized, that the cigarette papers have to burn without adding smoke or other harmful substances produce. For this purpose, these papers must be without

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any Kleoemittel solely by entanglement (ie mutual mechanical Verwalkung) are made of fibers, which are also very specific conditions have to meet · The cigarette papers are currently exclusively using flax and hemp fibers and possibly also produced rice. In order to ensure a regular and relatively slow combustion that is compatible with the tobacco, the paper pulp must contain a considerable amount of filler, generally calcium carbonate, which after combustion also forms a stable and compact layer of ash.

The cigarette paper has to be as light and porous as possible, but at the same time it has to be prescribed Minimum level of mechanical resistance and a first-class coverage with absolute Have opacity that completely hides the tobacco contained in the tube. In addition, that should Paper has a dazzling white appearance to a high degree.

With this assumption, the object of the invention is the production of perfected papers that meet the prescribed requirements Meet requirements in terms of mechanical resistance, opacity and white appearance, possibly also by improving these properties a porosity, or more precisely, the after

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Cigarette papers produced in the traditional way have an absolutely superior air permeability. The importance of air permeability is well known. In fact, there are certain minimum limits to the porosity of these papers drawn · Indeed, with cigarette paper there is a world-wide air draft for complete combustion of tobacco is crucial.

Without the various «By the way, not yet complete confirmed theories regarding compounds that form during tobacco combustion, carcinogenic or in any case to discuss harmful substances, it is sufficient here to point out that this is most likely due to the phenomena of pyrolysis and in any case its cause in the insufficient Burning tobacco and the resulting distillation of harmful substances. The through the special The oxygen enrichment made possible by paper structure is for a reduction of the resulting from the burning of the tobacco and by the inhalation of the produced thereby The harmful and health-endangering factors that come into play are decisive.

It was surprisingly found that when using of synthetic fibers of cellulose-like origin, belonging to a category

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gorle belong to the so-called "polyinosine" fibers and comply with the properties given below, without disadvantage in a decidedly better degree of porosity or better air permeability in the Cigarette papers were obtained ^ on the contrary with others

Advantages (mechanical stability, original authenticity mnd Gute Weiss®) · The use of such

Fibers with a high percentage compared to the <ä © a usual »natural fibers used for this purpose reduce the harmful factors when burning soletier paper © blldl © acl @ n, because the cellulose-like component of these synthetic fibers has a much more pure & © ifcsw @ rt (im special by «las j? qM © b ^ © a wood pulp raaö other nattolioiien Beetaiidteil © ©]) -? than do feoa been öevor- "ugten natural fibers SISR Ziga £ Ott © sspapl © rd © i? Case is ₀

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ORiGiNAL fMSPEÜTED

- Pipes of fine denier must be used, preferably not Over 5 denier can be used, possibly between 0.8 and 1.5 denierj

- the fibers are in short-fiber flakes, for example not more than 100 mm, and preferably in lengths between J5 and 20 mm.

It has been found that these fibers, after a previous wet treatment of "refining" in the well-known characteristic states of the hemp fibers used for paper manufacture and especially also of cigarette paper, are able to replace them to a high degree, at least 20 to 50 % also more of the natural fibers currently used for the production of these papers with a high filler content of not less than 20 %, preferably in the order of 40 % by weight, and also preferably using calcium carbonate.

The main features and benefits that come from of the invention arise «go in the course of the following detailed Description taking into account the possible embodiments for such improved papers. The results obtained in tests with this paper are also shown in comparison with those with Papers of conventional dimensions and results obtained according to the existing standards.

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As a traditional mass was used? Normal mass

Flax waste 85Ji weight-wise New balancing act 7.5% ^after I ^A Hemp threads 7 * 5 # *

In contrast, the following compound was used according to the invention:

Flax waste $ 42.5 by weight New balancing act 3 * 85 * " I ^A Hemp threads 3.7 * ⁿ

Polyinosis fibers (1) 50Ji ⁿ (1) Polyinosis fibers were used according to Young's modulus of 30-40; 1.2 denier with lengths between 3 and 20 mm. They have been subjected to a wet refining treatment identical to that of the hemp fiber.

Papers with different square weights and with different amounts of filler (calcium carbonate CC / 20) manufactured.

The following examples are in tabular form in direct comparison with equivalent papers from normal dimensions specified above designed

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Β «1 · ρ1 · 1 degree explos. Impervious Porosity Asohe No. ° SR Factor perity Ph. Plug % Photo

(20 g / qra)
filler 89 1.8 88 52 • .5 84.5 I ₁ to 93 ' 2.8 81 6th 6th 84.5 filler 89 1.8 96 30th 6th 85 108 2 to 93 2.7 94.5 2 7.1 84.5 L / 808 (20 gr / sqm)
filler 87 1.5 91.5 82 13.4 86.5 ο
K) 3 to 92 1.6 90 28 13.8 85 (45gr / sqm) 87 1.3 98 52 15.5 86.5 4 DJS 92. 1.7 97.5 14th 15.9 85

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If one compares the exemplary embodiments according to the invention with the comparative examples identified by no . The porosity naturally increases on a larger scale if papers with relatively little filler (Examples 1 and 2) are produced. On the other hand, in these cases the porosity becomes far better when polynosic fibers are used and only exceeds the prescribed values when the paper is made exactly according to the invention.

The example of predominantly practical interest is that with number 3. In this case one can observe that on the one hand a tripled air permeability is achieved, on the other hand the prescribed grammage when producing an improved paper according to the invention is complied with and it also has a more favorable filler content of calcium carbonate, also compared to the corresponding papers of traditional manufacture (Example 3 bis) with regard to opacity and bleaching offers a real advantage, while the mechanical resistance suffers an albeit harmless reduction (explosion factor from 1.6 to 1.5).

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From the point of view of practical samples " There were no appreciable differences between the inventively improved and the traditional one Type appropriate papers.

Further tests were carried out with different percentages of polyinose fibers. The improvement in the degree of porosity is practically linear relative to the percentage of the polyinose fibers. Good results were also achieved with a limited proportion of more than 50 polyinose Achieve fibers, but with a progressive reduction in mechanical resistance and retention capacity of fillers.

A corresponding deterioration in the mechanical resistance occurs when using polyinose fibers will «who have a lower Young Modulus. From this point of view, as important «if not at all as Considered indispensable to use «polyinous fibers of a different kind« than those «when used in spinning mills and weaving mills are more appropriate "because it is an application area" in which there is a tendency " To use fibers «which belong to a lower Young's modulus» However, better surface properties have "which the latter, understandably, have no meaning in the present field of application" after the poly-

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inosis-like fibers for the purpose of matting and formation of the Paper have been subjected to a prior refining treatment

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Claims (12)

PATENT CLAIM E Paper for cigarette tubes and equivalent applications, daduroh in that polyinosisohe parsers are used as part of the fiber content in the pulp to daduroh improve its porosity or air urgency Htu. 2) Paper according to claim 1, characterized in that the fibers used have a Young's modulus over 10 to have. · 3) Paper according to claim 2, characterized in that the Young's modulus is between 20 and HO . 4) Paper according to one of the preceding claims, characterized daduroh that polyinosisohe fibers with Denier does not exceed 5 and preferably between 0.8 and 1.5 denier can be used. 5) paper nadh one of the preceding claims, characterized in that polzlnoslsohe fibers in Flakes with fiber lengths not exceeding 100 mm, preferably between 3 and 20 mm can be used. 6) Paper according to one of the preceding claims, characterized by the treatment of the polyinosis Fibers in preparation for paper formation by means of a wet refining process for the preparation of the - 12 - 109808 / U 0.2 delivery of cigarette paper to certain hemp fibers the modalities and under traditionally applied conditions O 7) Paper according to one of the preceding claims, characterized in that in the paper formation means a mass, the fibrous components are formed by a significant proportion of polyinose fibers. 8) Paper according to claim 7, characterized in that the fiber stock of the paper pulp consists of at least $ 20 and preferably $ 50 of polyinous fibers together with other natural fibers -, 9) paper according to one of the preceding claims, characterized in that the made of natural fibers and polyinosischen Pasern formed mass by weight at least $ 20 fillers such as calcium carbonate added are. 10) Paper according to claim 9, characterized by by weight j50 # polyinous fibers and also by weight J> 0% natural fibers with the addition of 40 $ fillers. 11) paper for the production of the tubular cigarette tubes and the like, characterized in that it has a matted fiber structure containing polyinose fibers, in particular with a high Young's modulus (over 10 and preferably between J / 0 and 40), and 109808 / U02 Fillers (preferably calcium carbonate) that are at least 20 #, preferably 40 #, by weight of the weight of the paper be. 12) cigarette paper according to claim 11, characterized in that it has a sheet weight of 20 gr / sqm and has a porosity (measured at the stopper of 20 mm) in the order of 80 and the best opacity properties and whiteness. 1098Q8 / U02