KR920006673B1 - Method of producing cigarette filter - Google Patents

Abstract

The preparing method of cotton fabric cigarette filter which features high tar removal ability as well as mild taste comprises; drying of cotton by conventional method, weaving woven fabric in a gauze form using soft-twisted yarn of 12-20's as a warp (2a), soft twisted yarn of 50-65's as a weft (2b), spraying with small amount of adhesives of rice starch onto the woven fabric, cutting them into small width by punching in a constant interval, winding the cutted fabric in a mechanical way, passing them through filter rod molding machine primarily to heat-dry, through first, second, third induction pipe, thus making filter rod in which punched parts form small space making smooth touch on a mouth possible.

Description

Cotton fiber filter manufacturing method

1 is a partial cutaway view of the filter rod of the present invention.

Figure 2 (a) is an enlarged view of the fabric woven with the cotton of the present invention, (b) is an enlarged view of the fabric punched at regular intervals to the fabric woven with the cotton of the present invention.

3 is an enlarged side view of the microscope showing twisting in the shape of a ribbon of cotton fibers.

4 is an enlarged perspective view of a cut part of the cotton fiber seen under the microscope.

* Explanation of symbols for main parts of the drawings

1: filter 2: cotton fiber fabric

2a: warp yarn 2b: weft yarn

3: punching part

FIELD OF THE INVENTION The present invention relates to an improved cotton fiber fabric filter made by rolling a woven fabric of gauze form from cotton twisted yarn, and a method of manufacturing the same. The most important purpose of the cigarette filter is to reduce the absorption of so-called tar material, which collectively refers to Total Particulate Matter (TPM) contained in cigarette smoke, into the human body. Another object is to change the composition of tobacco smoke in such a way that it can remove certain compounds such as waste phenol found in the vapor phase of tobacco smoke.

Various cigarette filters have been developed in the past as a means to achieve the above object.

For example, paper, cotton, hemp, cellulose acetate fiber, etc. have been used as the main materials of the filter, but the paper filter is used after wrinkling paper or gripping paper. If the paper wrinkle is not dense, the removal efficiency of tar is low. On the contrary, if the paper wrinkle is too dense, the resistance against air flow through the filter rod, that is, the pressure drop is too high. There is a disadvantage in that the touch is poor, and when the filter is manufactured from raw materials such as cotton or hemp, the processing process is complicated, and the curing and adsorption power of the fiber itself is reduced in the processing process. In order to provide a high cost, it is necessary to go through a separate resin processing process (for example, treatment with a polystyrene resin solution). Tobacco filter made of chemical fiber such as cellulose, acetate, etc., has smooth surface, so tar contained in cigarette smoke has small surface area that collides with fiber surface, so the adsorption power of tar is low and hygroscopicity is standard. Less than about 6% of cotton fiber has a disadvantage of low filtration rate of tar, and to make filter rods with tow made of filament, tow manufacturing, opening of the tow, precise local treatment of plasticizer, loose tow The manufacturing process has to be complicated and uneconomical because it requires a manufacturing process such as making the inside of a rod, wrapping the rod, pasting the rod, and cutting the rod to an appropriate length.

On the other hand, if you look at the natural fiber cotton (왜) fiber is used as a filter is not used, first, there is a technical difficulty in the filter manufacturing process because the rough fiber fibers are entangled with each other, second, the fiber is too soft, In addition to the weak elastic recovery rate, the fibers are agglomerated, making the filter difficult. Third, when the cotton wool itself is used as a filter, the removal rate of tar is so excellent that the inherent taste of tobacco cannot be enjoyed at all. The strong smoke rate of cigarette smoke decreases, so the cigarette smoke is not sucked well.

Cotton fiber used as the material of the filter rod in the present invention, as shown in Figure 3, the side of the fiber is twisted in the shape of a ribbon, and as shown in Figure 4 is formed of the epidermis and the primary layer, the secondary layer and the inner pores from the surface, In terms of chemical properties, cotton fiber consists of 94.0% of fiber, 1.3% of protein, 1.2% of corticotin, 1.2% of ash, 0.6% of waxy fat, 0.6% of sugars, and 3% of other residues of 1.4%. As a result, cotton fibers contained saccharides (0.6%), and it was found that the adhesion of tar, including nicotine, was excellent due to the adhesion of sugars.

In addition, cotton fiber is 7-11% in hygroscopic standard condition, and the process moisture content is 8.5%, and it is superior in hygroscopicity than cellulose and acetate which is chemical fiber (about 6% in standard condition and 6.5% process moisture content in hygroscopicity). Finally, it was found that the adsorption power was superior to cellulose and acetate.

In addition, cellulose and acetate, which are synthetic fibers, may be harmful to the human body when used as a filter, but cotton fibers, which are natural fibers, are almost harmless to the human body. Thus, in the present invention, cotton fibers are used as the filter material, and the cotton fibers themselves are the same as the filter. There are four drawbacks. To solve this problem, the cotton fiber is made of low-twist pharmacist yarn, and the gauze-shaped fabric is woven by changing the thickness of warp and weft yarns. It is to make a rod.

In the present invention, as described above with reference to the accompanying drawings to provide the production of a high-quality filter as a simple process and facilities while reducing the above-mentioned defects as much as possible and a manufacturing method thereof as follows. That is, cotton is degreased and dried by a known method, and about 12-20 sheets of weak twisted yarn is inclined (2a), about 50-65 degrees of weak twisted yarn. One end of the woven fabric (2) woven into the "gauze" (2) with the weft (2b) is wound on one side roll, the other end is fixed to the opposite side roll, and then the adhesive of rice starch of about 150-250 mesh After loosening in water and spraying a small amount mechanically, the fabric (2) cut to a suitable width (for example, 25Cm-40Cm) is mechanically rolled and put into a filter rod molding machine and heated first to dry. Heat-dried, gradually passing the first induction pipe having a diameter slightly larger than the diameter of the cross section of the filter rod and the second induction pipe having a diameter equal to the diameter of the cross section of the filter rod. Have a diameter of 5-7% smaller than the diameter of the cross section Is instantaneously passed into the tertiary induction pipe to form a filter rod, and the filter rod is cut to about 10-30 mm in an appropriate length to produce a tobacco filter of the present invention. Unexplained reference numeral 4 is a ribbon of cotton fibers, 5 is the epidermis, 6 is the primary layer, 7 is the secondary layer, 8 is the inner cavity.

The cotton fiber filter of the present invention prepared as described above is manufactured by forming a woven fabric with a weak twist yarn (弱 蓮 絲), so when manufacturing the filter with cotton fiber itself, technical difficulties in the process of manufacturing the filter, such as tangling or agglomeration of cotton fiber cytoplasm There is no at all, when the cotton fiber itself is used as a filter, the removal rate of tar, etc. is so excellent that the disadvantage of not being able to enjoy the unique taste of tobacco is eliminated. In the present invention, the fabric (2) woven by weak yarn is molded to form a filter. In order to control the pressure drop of the filter (pass rate of cigarette smoke), the fiber density per unit area of the filter's longitudinal section (actually the strength and the number of windings of the fabric) can be controlled mechanically. In addition, in the present invention, it is formed by punching at regular intervals on the fabric woven with weak yarn (see also FIG. 2 (b)). One filter has the advantage of making the filter of cigarettes (for example, women's mild cigarettes) that have the same soft touch to the lips but also have a high rate of tar removal, resulting in a milder taste.

The present invention is described in detail according to the embodiment.

Example 1

Cotton is degreased by a known method, and dried to minimize the loss of sugar contained in cotton fibers. Weaving is performed with the weft yarn 2b, but the number of weft yarns 2b per unit area is doubled, and the number of warp yarns 2a is roughly woven. One end of the fabric 2 is wound on one roll and the other end is fixed on the opposite roll. Then, 150-250 mesh of rice starch adhesive is diluted in water and sprayed with a small amount of mechanically. Then, the fabric (2) cut into a suitable narrow width (for example, 25Cm-40Cm) is mechanically rolled into a filter rod molding machine and heated. First drying to form a filter rod into a rod shape, and in turn into a primary induction tube having a diameter slightly larger than the diameter of the cross section of the filter rod that requires the filter rod and into a secondary induction tube having a diameter equal to the diameter of the cross section of the filter rod. When passing slowly Finally, the filter rod is finally passed through a tertiary induction tube having a diameter of 5-7% smaller than the diameter of the cross section of the filter rod. Since the diameter becomes 5-7% larger again, the elasticity of the filter rod is restored and the adhesion is also good.

The filter rod thus formed is cut to a suitable length, for example, about 10 mm to 30 mm to produce a tobacco filter of the present invention.

Example 2

As in Example 1, the fabric 2 woven with weak twisted yarns was punched at regular intervals (see also (b) of FIG. 2) and rolled to form a filter as in Example 1, and then punched in the fabric 2 Maintaining a small space in the portion of the molded filter rod is the same as the filter in Example 1 while the touch of the lips is soft and the removal rate of the tar is high to produce a filter of a cigarette that gives a more mild taste.

Claims (2)

Dry the cotton in a known manner to make rice starch into a woven fabric (2) that is woven with 12-20 water weak yarns as warp yarns (2a) and 50-65 water soft yarns as weft yarns (2b). Sprayed with a small amount of adhesive, and then cut into suitable narrow widths, rolled, put into a filter rod molding machine, heated, and firstly dried to form a filter rod into rods, and again, primary and secondary induction tubes having different diameters. And manufacturing by heating and drying while sequentially passing through the third induction pipe. The method of manufacturing a cotton fiber fabric filter according to claim 1, wherein the fabric (2) woven with weak yarn is punched at regular intervals to maintain a small space in the rolled and formed filter rod.

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