DE1099423B - Filter element for tobacco smoke containing powdered substances - Google Patents

Description

GERMAN

The invention relates to a powder containing substances Filter element for tobacco smoke, in particular a filter element according to patent application E 8226 III / 79 b from a strand of continuously crimped fibers by spreading in ribbon form, spraying the so exposed fibers with an adhering agent, gathering the so treated Strand made into a dimensionally stable homogeneous filter rod and cut the filter rod is. ίο

According to the invention, the filter element is intended to improve its filtering effectiveness by adding it certain powdery substances are further developed.

It is already known, tobacco smoke filter elements conventional structure powdery substances, for example Activated charcoal to be added. A peculiarity of the previously known powdery additives for filter elements is that these additives are generally unlikely to adhere satisfactorily can be placed in the filter elements, so that they with the inevitable mechanical Stresses crumble out and thus get lost or even in a disruptive way in the mouth of the Smokers can get.

In contrast, the invention is based on the object of providing a filter element with additives that adhere better to develop. This object is achieved according to the invention in that the filter element Adds starch powder in amounts of up to 60%. Particularly preferred additives are Wheat flour and rice starch.

The filter element according to the invention accordingly consists essentially of a mass of generally longitudinally oriented fibers as filter media for tobacco smoke. the Interstices between almost all groups of neighboring fibers form capillary-shaped ones Channels for the smoke. According to the invention, the starch particles mentioned are all in one in the fiber mass Amount of up to 60 percent by weight, based on the weight of the fiber mass, stored. The starch particles lie in the capillary-shaped channels and partially block them, so that a considerable Part of the smoke meets either the fibers or the starch particles.

It turns out that the starch particles adhere much better to the fibers of the filter elements than, for example Activated carbon, silica, kieselguhr or the like.

To determine the relative adhesive strength of various solids to the fibers paver Filter elements were strands of crimped cellulose acetate fibers that were variously powdered Contained substances, processed as follows:

Containing powdery substances
Filter element for tobacco smoke

Addition to additional patent application E 8226 III / 79 b
(Interpretation document 1 032 693)

Applicant:

Eastman Kodak Company,
Rochester, NY (V. St. A.)

Representative: Dr.-Ing. W. Wolff, patent attorney,
Stuttgart N ₁ Lange Str. 51

Claimed priority:
V. St. v. America March 3, 1954

George Patrick Touey, Kingsport, Tenn. (V. St. A.), has been named as the inventor

An acetyl cellulose strand, as described below in Example 1, was plasticized with those mentioned there Type and amount sprayed and then with the different ones listed in the following list powdery substances. The strength with which the powder particles in a 78 mm Long filter element adhered was determined by placing the filter element in a vertical position from a height dropped from about 30 cm onto a smooth glass surface. The adhesive strength of the powdery Additives were determined based on the number of times the filter element was dropped from the specified height until the first trace of powdery additive appeared on the glass plate. the The results of these tests are compiled in the following list:

Type and amount

of the powder additive
in the filter element

Activated silica gel,
Sieve fineness 325 22%

Activated aluminum oxide,
Sieve fineness 325 .... 20%

Activated charcoal,

Sieve fineness 250 .... 18%

Result
(Fall from about 30 cm high)

Powder trail after the first fall

Powder trail after the first fall

Powder trail after the first fall

109 509/76

Type and amount

of the powder additive
in the filter element

Talc,

Sieve fineness 325 .... 20%

Calcium carbonates

Sieve fineness 325 .... 21%

Titanium dioxide,

Sieve fineness 325 15%

Wood flour,

Sieve fineness 250 23%

Cellulose powder,

Sieve fineness200 25%

Dextrin,

Sieve fineness 250 .... 20%

Potato starch,

Sieve fineness 200 21%

Rice starch,

Sieve fineness 325 18%

Wheat starch,

Sieve fineness 300 20%

Wheat flour,

Sieve fineness 325 .... 25% '.

Result (falling from a height of about 30 cm)

Powder trail after the first fall

Powder trail after the first fall

Powder trail after the first fall

Powder trail after the second case

Powder trail after the third fall

Powder trail after the third fall

Powder trail after the third fall

Powder trace after the fourth case

Powder trace after the fourth case

Powder trace after the tenth fall

The better adhesion of the starch particles used according to the invention is a remarkable one This is an advantage as the starch powder when processing the filter elements into cigarettes and is not lost in the transport of the finished cigarettes and "no unsightly marks in the Packs or the like. Forms.

In addition, starch powder is opposed to active charcoal or other activated absorbents the advantage that it does not affect the taste and aroma of the smoke.

In a preferred embodiment of the subject matter of the invention, the filter means consists of synthetically spun continuous threads. The filter element made from these threads consists that is, from a structurally coherent, cylindrical fiber mass, that of a corresponding Shell is surrounded. All fibers of the mass run essentially in the same direction. The fibers as a whole are therefore mainly aligned in the longitudinal direction of the mass. Almost every of the individual fibers, however, has a larger number of short sections, which are divergent and are curled converging to the main fiber axis. Much of the fibers are through surface dissolution bound to the neighboring fibers at random points of contact. The fiber mass carries the mass of solid, fine-grain vegetable starch particles distributed in it essentially uniformly in an amount of up to 60 percent by weight of the fiber mass.

Preferably, the filter is made of acetyl cellulose fibers, which by the application of a fine spray of a plasticizer are stuck together by dissolving the fiber surface.

In this preferred embodiment, the fiber mass carries the fine-grain starch particles in one Amount of about 10 to 40 percent by weight based on the total weight of the filter.

The known methods of dusting can be used to manufacture the filter elements according to the invention a powder on a fiber surface or for penetrating a fiber mass with a powder be applied. For example, the starch powder can simply be blown onto the fibers will. However, the starch can also be in the form of a slurry in cold water or in an organic one Solvent or in a plasticizer can be applied. Another method of application of the starch powder on the fibers consists in the application of an electrostatic charge; H.

ίο on the fibers is caused for example by friction or the like. An electrical charge is induced. The fibers are then passed through a highly concentrated Chamber containing starch dust are running. To apply the starch to the fibers, the The surface of the fibers can be moistened with an adhesive or a plasticizer before the Fibers are exposed to a powder spray device.

Preferably, however, the starch is continuously brought to an opened and banded, running fiber strand applied. This opened. The shape of the fiber strand is in the main patent application described. This means that the fiber strand running off a supply roll is loosened up and unbundled until the strand has a larger cross-section and a more uniform cross-sectional distribution can be achieved. The opened strand is evenly spread over a larger width, for example on seven times its original width.

spreads. In this way, essentially all fibers can then be treated with an appropriate treatment agent, for example a plasticizer dispensed from a dispenser under which the opened strand passes through. The starch can be applied to the fiber strand before or after the application of the Plasticizer or applied simultaneously with this. Preferably the strength is simultaneous or applied after the application of the plasticizer.

The following examples serve further

Explanation of the invention.

example 1

A partially opened strand of acetyl cellulose yarn containing approximately 20,000 fibers of 5 denier per thread was slowly via a device working with compressed air, converting the strand into tape form drawn according to the main patent application. The air flow from the device spreads the fibers of the strand to a width of about 15.2 cm. The strand was now in its expanded state with a vigorously stirred slurry of a part of commercially available, powdered grain starch sprayed in 5 parts of dimethoxyethyl phthalate as a plasticizer. After spraying, the strand became in withdrawn its original cord form and fed into a standard cigarette making machine, in which it was wrapped in paper and cut into sticks adapted to the usual size of cigarettes became. The bars contained one part starch, 5 parts plasticizer and 25 parts acetyl cellulose (Weight units).

The filter rods produced in this way were briefly heated so that the acetyl fibers were exposed to the action of the plasticizer partially dissolved on the surface. Then the filter rods were put into commercially available, Cut up 12 mm long filter elements.

The filter elements were attached to commercially available cigarettes by means of adhesive tape. the Cigarettes sore from a smoking machine that was in

1 UJ7C7

their construction and mode of operation are those of J. A. Bradford, W. R. Harlan and H. R. Hammer in Industrial and Engineering Chemistry, Vol. 28, pp. 836 to 839, corresponded to the machine described, smoked. The collected smoke was analyzed for its nicotine and tar content. With a second The same brand of cigarette was used. The cigarettes weigh * also 12 mm long Filter elements made from the same acetyl cellulose fiber strand as the filter elements of the first series of tests were manufactured. The acetyl cellulose fiber strand was also with dimethoxyethyl phthalate softened. However, it did not contain any starch. The results are in the table below compiled. "'

12 mm long cigarette filter tar
Products *)
mg Nicotine *)
mg Softened acetyl cell
loose strand
Softened acetyl cell
loose strand containing 3.2% grain
starch included 140
110 20th
14th

spread to a width of 15.2 cm and built up with a 10% solution of a water-based Sprayed with adhesive. The strand became while it was still in its expanded form and was damp due to the adhesive, sprayed with a commercially available, fine-grained grain starch powder. The strand was then rolled into its original shape. The strand so impregnated was processed into filter rods. The filter rods were in

ίο Cut pieces of 12 mm in length.

The filter elements produced in this way, which are 9 percent strength by weight, based on the weight of the acetyl fibers, were attached to commercially available cigarettes. Ten of these cigarettes were opened smoked a smoke machine. The collected smoke was analyzed for nicotine and tar products.

For a control experiment, the same cigarettes with filter elements made from a strand of 3 denier threads were made and which contained the adhesive but no starch. the Cigarettes were also smoked on the smoke machine. The collected smoke was in the same Way analyzed for its nicotine and tar content.

¹ J Obtained from the collected smoke of ten filtered 'cigarettes.

Moisture content of the tobacco of each of the cigarettes 11.8%.

Example 2

A loose, d. H. partially open strand of acetyl cellulose yarn containing about 10,000 fibers of each Containing 8 denier per thread, was drawn through a bath consisting of a vigorously stirred slurry of 15% commercially available starch powder in cold water. After drying, the contained Strand 14 percent by weight of starch evenly distributed in it. The starch impregnated strand was processed into filter rods according to the procedure given in Example 1. The filter rods were cut into pieces of 12 mm in length. The filter elements produced in this way were commercially available available. Cigarettes attached. Every ten of these filtered cigarettes were made smoked on the smoke machine. The smoke that was collected was based on its nicotine and tar content analyzed. The same brand of cigarette was used in a control experiment. These cigarettes were provided with filters that out. a strand of 8 denier threads were made, however, the strand contained no starch. These cigarettes were also on the smoking machine smoked. The collected smoke was analyzed for nicotine and tar content in the same way. The following results were obtained: Filters made from a strand of acetyl cellulose

Filter made from a 9% strength
containing acetyl cellulose strand

Tar products

135

Nicotine mg

19th

13th

Moisture content of the tobacco of each of the cigarettes 12.0%.

12 mm long cigarette filter Tar products
mg nicotine
mg Acetyl fiber filter
strand
Acetyl fiber filter
strand, which is 12% strength
contained 155
100 21
13th

In the manufacture of the filter element according to the invention, the shape of the strength plays a certain role Role. The starch should be so fine-grained that it is easily slurried in a liquid can be, or can be passed through a spray nozzle. The commercially available Starch powder, such as corn, wheat, potato, rice or tapioca starch, can be used. A proved to be particularly effective for producing the filter elements according to the invention unseparated and unpurified starch in the form of wheat flour. Oxidized starches can also be used will. The starch derivatives such as dextrin or the various forms of hydrolyzed are also suitable Strengthen.

Although unusually good results with filter elements can be obtained from a crimped strand of continuous filaments of acetyl cellulose fibers are made with a plasticizer such as dimethoxyethyl phthalate or Methylphtalyläthylglykollat was sprayed, it is readily understood by those skilled in the art that the Idea of the invention also for filter elements made of other fiber materials, for example from under the Brand name "nylon" known material, or made from viscose, cotton, polyamides, polyesters, etc. are made, especially when these threads are oriented in the longitudinal direction and in the longitudinal direction the housing of the filter.

The tobacco for each of these cigarettes contained 12.1% moisture.

Example 3

" A hank of acetyl cellulose yarn containing approximately 40,000 fibers of 3 denier per thread was made

Claims (3)

Patent claims: 1. Filter element containing powdery substances for tobacco smoke, in particular filter element according to patent application E 8226 III / 79b 7 8 from a strand of continuously crimped fibers 2. Filter element according to claim 1, characterized in that by spreading it out in the form of a tape, spraying it so that it contains wheat flour, exposed fibers with an adhesion causing 3. Filter element according to claim 1, characterized in that relevant means, summarizing the so treated that it contains rice starch. delten strand to a dimensionally stable homo- 5 Genen filter rod and cutting up the filter. Rod is made, characterized in that German Patent Nos. 579 101, 612 737, it contains up to 60% starch powder. 665 278, 666 035. © 109 509/76 1.61