FR2480572A1 - PAPER FILTER OBTAINED ON AN INCLINED SIEVE MACHINE - Google Patents

Abstract

TOBACCO SMOKE FILTER CHARACTERIZED BY THE FACT THAT IT INCLUDES A SHEET OF GAUDREE AND OR FIBRILLEED LONGITUDINALLY FIBRILLED PAPER AND GATHERED LATERALLY AND HELD IN THE FORM OF A STEM, THE PAPER BEING CARRIED OUT ON A SIEVE MACHINE OF 1 INCLINED A FIBER 25 MILLIMETERS LONG AND HAVING A FINAL GRAMMAGE BEFORE EMBOSSING AND OR FIBRILLATION BETWEEN 12 AND 40GRAMS BY M.

Description

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  The present invention relates to tobacco smoke filters and to their manufacture and provides a sheet of paper embossed and / or fibrillate longitudinally, and assembled laterally and held in the form of a rod. the paper being obtained on a machine of the Fourdrimier type with an inclined sieve from fibers from 1 to 25 millimeters long and having a final grammage

  before embossing and / or fibrillation from 12 to 40 grams per m2.

  The invention also provides a method for manufacturing a tobacco smoke filter which comprises the steps of forming a sheet of paper of final grammage from 12 to 40 gr / m2 using an inclined sieve machine with a reserve of fibers. uniformity between 0, 008 and 1% o (for example, around

0.1%) and fiber lengths between 1 and 25 milli-

meters, continuously advancing the finished paper longitudinally between cooperating rollers having a circumferential embossing, then gathering longitudinally continuously in the form of rods the paper advancing longitudinally and cutting transversely continuously into elementary lengths the rod produced continuously

resulting.

This finished sheet of paper is generally advanced longitudinally between cooperating embossing rollers having circumferential embossments or alternating grooves and edges which may extend perpendicular to the axes of the rollers or may extend in helices around these rollers. This embossing treatment tends to fibrillate the sheet in its longitudinal direction and in some cases it is this fibrillation rather than the longitudinal embossing which appears in the treated sheet although often

  both embossing and fibrillation are readily observable.

  It is particularly preferred to use in the invention

  tion an inclined screen machine having a member allowing

  to obtain a finished sheet of paper having a multiplicity of open

  tures preferably distributed evenly. From the constitution of

wire, result the number, the size and the design of the openings.

  Such paper, for example, has generally hexagonal openings about every millimeter, the fiber being concentrated in the relatively thin walls between the openings and no fiber or few fibers pass through these openings. Such paper with openings is known as tea bag paper or diffusion paper, uses for which it is made from a reserve containing artificial fibers; paper to

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openings used according to the invention is preferably made at

from 100% natural fibers (e.g. paper pulp).

The length of fibers is preferably between 1 and 12 millimeters for example, and the final grammage of the sheet before embossing is preferably between 15 and 25 grams per m2. The fiber of the paper sheet can be a 100% fib-e

natural (for example, paper pulp), a 100% synthetic fiber

tick or a mixture of the two, but preferably a 100% natural fiber for a paper with openings. When the sheet comprises synthetic fibers, binding agents can be incorporated

  to increase the hardness of the finished rod.

a binding agent can be incorporated into the sheet of paper or added to it before its compression in the form of a rod, the binding agent having the effect (for example, during an embossing) of binding the assembled sheet into a supporting rod but consistent which maintains itself without an envelope. In other embodiments, the collected sheet can be continuously wrapped conventionally during the stem forming step and this can be done even when the gathered stem of products

finis maintains itself.

  It has been found that cigarettes fitted with filters according to the invention provide smoke with an excellent taste and that the filters can present a better compromise between the loss of

- load and hardness than those currently available.

  In the preferred embodiments of the invention using paper with openings, the openings give an effect

cell or "expanded polystyrene" when the paper is collected

  wheat to form a stalk and provide hardness and elasticity

higher than for density rods equLva-

  slow produced from paper without opening, the hardness and elasticity being equivalent to those of cellulose acetate rods of the same density. The filters according to the invention, in

  especially those made of paper with openings, may have characteristics

  excellent tinting characteristics and tip appearance (as good or better than that of acetate filters which have hitherto been preferred by the public for this reason) even for very low head pressure drop values. Both the open and unopened varieties of paper have excellent taste characteristics, much better than cigarette filters made from prior paper and can be

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produced to any given specification up to 30% lower density than equivalent conventional paper filter rods. The filters according to the invention can give better retention of the particulate phase of tobacco smoke than the cellulose acetate filters causing the same pressure drop (PC) as shown in the attached graph giving the percentage of tar retention as a function of the head pressure drop (in millimeters of water height) for conventional wrapped acetate filter tips (zone A) and paper filter tips without opening according to the invention (line B) the tips in each case being 20 millimeters from

  long by 24.6 millimeters in circumference.

Filters according to the invention can be wrapped in standard envelopes and can be ventilated with all

conventional ways.

  In the following examples, filter rods according to the invention of different pressure drops (PC) are compared with similar conventional rods of wrapped acetate and wrapped crepe paper. Comparisons are standardized for

  rods 90 millimeters long by 24.5 millimeters in circumference

ference (i.e. end caps of 15 x 24 millimeters) with an envelope of 26.5 millimeters and 27 grams per m2 The 90 mm rod is in the form in which the filter

  is typically delivered to a manufacturer of cigaret filters-

to cut it into individual 15mm tips. In each example, the "PC bit" and the "tar retention" are those of 15 mm long bits; all pressure drops are

expressed in millimeters of water height.

  90 x 24.5 rod; PC 185 mm of water Caqparaison Invention Acetate Filter "Myra" Materials; Porous sheet without 6.4Y / 39 Estron Crepe paper Weight / m2 25 g / m2 opening 40 g / m2 (100% paper pulp) Weight in g. for rods 6.22 6.39 7.80

Density of the fill

sage g / c3 0.130 0.135 0.166 Hardness% 90.0 91.5 89.5 PC end cap mm of water33, 9 31.0 33.9 Tar retention in% Example 2 Rod of 90 x 24.5; , 0 C 235 mm of water Materials; weight / m2 Weight in g. for * 5 10 stems

Density of filling

  sage g / c3 Hardness% PC nozzle mm of water! Tar retention in% Invention Porous sheet without opening of 25 g / m2 (100% paper pulp) 6.79 0.144 91.5 Acetate Y / 40 Estroe 6.49 0.137 91.5 33.7 "Myra" filter crepe 36 g / m2 8.34

0.178.

51.0

Example 3

  90 x 24.5 rod; PC 500 mm of water Materials; Weight / m2 iU Weight in g. for rods

Density of filling

sage g / c3 Hardness% PC with nozzle mm of water Tar retention in% Invention Porous sheet without opening of 25 g / m2 (100% paper pulp) 8.09 0.174 91.7 58.5 Acetate 2Y / 46 Estron 6 , 92 0.147 49.1 Omparaison "Myra" filter Crepe paper 36g / 2 9.00 0.195 93.5 91.7 The examples show particularly the good performances

  0 of filters according to the invention at low PCs, the excellent

  end frequency can be seen both before and after

use even at such weak PCs.

29.3 47.0

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  In example i above, the designation of the acetate 6,4Y / 46 signifies a strand of 46 x 103 denier made of filanents with Y-sections of 6.4 denier, the two designations in the

examples 2 and 3 having corresponding meanings.

  In each of the examples, the fiber length of the paper made on a sieve machine inclines in the filter according to the invention

is 2.5 to 6 mmrO and the paper used is finely embossed (approx.

ron 10 embossing / cm). In general, the fineness of the embossing (and / or of the fibrillation) in the paper used according to the invention can vary widely, for example between 5 and 30 embossing and

per day of fibrillation per cm.

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Claims (7)

1. Tobacco smoke filter characterized by the Milk it   includes a sheet of embossed and / or fibrillated longitu- linearly and joined laterally and held in the form of a rod, the paper being produced on a sieve machine inclined from fibers from 1 to 25 millimeters long and having a final grammage before embossing and / or fibrillation between 12 and 40 grams per m2.   2. Filter according to claim 1, characterized in that the paper is formed on the inclined screen machine with o a multiplicity of openings which cross it.   3. Filter according to any one of claims l and 2 characterized in that the fiber length is included between l and 12 millimeters. 4. Filter according to any one of claims l to   3, characterized in that the final grammage of the sheet before embossing is between 15 and 25 grams per m2 5. Method for producing a tobacco smoke filter characterized in that it comprises the steps consisting in forming a sheet of paper of final grammage between 12 and 40 grams per m2 using an inclined sieve machine with a reserve of uniformity fibers between 0.008 and 1% and fiber lengths between l and 25 millimeters, to continuously advance the finished paper longitudinally between cooperating rollers having a circumferentially extending embossing   Lement then to collect sideways continuously in the form of a rod the sheet of paper advancing longitudinally and to cut continuously into elementary lengths the rod produced continuously. 6. Method according to claim 5 characterized in that the paper is formed on the inclined screen machine with   a multiplicity of openings which cross it.   7. Method according to any one of claims 5 and   6 characterized in that the uniformity of the fiber reserve is about 0.1%.