JPS586467B2 - Cigarette filter manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cigarette filter in which two or more types of fiber materials are bundled into a sheath core structure.

Various cigarette filters have been developed to filter out harmful components from the smoke components during smoking, but the main focus of these cigarette filters is to remove nicotine and tar from the smoke components. Because of this,
From the viewpoint of improving smokers' smoking sensation, the development of suitable filters is currently delayed.

In addition, methods to remove carbon monoxide and harmful low-boiling components other than nicotine and tar contained in cigarette smoke are also being considered. For example, granular activated carbon is used in filters. Some methods have been proposed, such as a method in which activated carbon is made to exist in the filter element, and a method in which finely powdered activated carbon is deposited in a filter element, and although the above objective is quite satisfied, the present situation is far from improving the fragrance sensation.

Therefore, the present inventors developed a cigarette with a sheath-core structure that combines two or more types of materials as a cigarette filter that is effective in removing harmful components of cigarette smoke other than nicotine and tar and can improve the smoking sensation. After discovering that the filter was useful, they filed a patent application, and as a result of research into an effective method for manufacturing such a sheath core type cigarette filter, they completed the present invention.

An object of the present invention is to provide a method for accurately and efficiently manufacturing a cigarette filter having a sheath core structure using two or more types of fiber materials as cigarette filter raw materials. After the fibers are opened, they are formed into a cylindrical body by running the outside of the ring guide in contact with each other, and are fed to the outer tube of the double conical tube and converged into a cylindrical web, and the core part is inserted into this cylindrical web. It is an object of the present invention to provide a method for manufacturing a sheath core type cigarette filter, which is characterized in that a fiber material is fed through a central pipe of a double conical pipe and then integrated.

The method of the present invention will be explained with reference to FIG.

First, the fiber material 12 for the sheath portion is opened by the opening device 7, passes through the delivery roll 24, and is gradually shaped into a circle by the first ring guide 4 (radius r1) and the second ring guide 5 radius r2. It is expanded into an arc shape and then gradually formed into a cylindrical shape and fed into the outer tube of the double conical tube.

Although it is possible to make a cigarette filter with a sheath core type structure, which is the object of the present invention, with just one ring-shaped guide, it is possible to make a cigarette filter with a sheath core structure as the object of the present invention, but it is possible to gradually reduce the number of ring guides by using a plurality of ring guides, especially two or more ring guides with different radii. It is preferable to use a plurality of ring guides arranged in such a manner that the size of the ring guide is small, since it is possible to make the thickness of the sheath layer of the cigarette filter uniform and the shape of the cylindrical body uniform.

The AA' cross-sectional view and the B-B' cross-sectional view in Figure 3 are shown in Figures 4 and 5, respectively, and as shown in these figures, the fiber material of the sheath portion of the cigarette filter has a ring guide. As it passes outside, it gradually expands into an arc shape as shown in 9, and its angle increases from α1 to α2.

If a ring guide is not used, it is difficult to efficiently mold the fiber material for the sheath portion to be supplied to the double conical tube into a cylindrical shape, and it becomes difficult to form a sheath core type cigarette filter with a good shape.

On the other hand, when the fiber material for the core part is a material that does not need to be opened, for example, when it is made of sliver or spun roving, the guide 17 is set as shown in 18.
After passing through the ring guides 4 and 5, it may be supplied to the central circular tubular part of the double conical tube.
When the fiber material for the core part needs to be opened, such as a tow, it is as shown in 11, and after being opened by the opening device 8, it is passed through the delivery roll 25, and then passed through the ring guides 4 and 5. It is fed into the central circular tubular section of the double conical tube.

In some cases, it is also possible to use two types of fiber materials together as the core member.

The arc-shaped fiber material for the sheath portion and the fiber material for the core portion that have passed through the ring guide may be fed parallel to the axis of the double conical tube, but it is most preferable to It is preferable for the fiber material for the part to run at a certain angle so as to contact the outside of the inner tube of the double conical tube, thereby creating an arcuate shape as shown in FIGS. The fiber material 9 for the sheath portion which has been formed can be very easily formed into a uniform cylindrical shape.

Further, it is preferable that the fiber material 10 for the core portion is also supplied at a certain angle so as to run in contact with the inside of the central circular tube of the double conical tube.
0 is also efficiently formed into a perfect circular shape as shown in FIG. 6 and FIG. can be supplied to the center of

An enlarged perspective view of the double conical tube used in the present invention is shown in FIG. 8, and an enlarged cross-sectional view is shown in FIG. 9.

In FIG. 8, reference numeral 21 indicates the outer tube of the double conical tube, 22 indicates the inner tube, 19 indicates the outer circular tubular portion, and 20 indicates the central circular tubular portion.

As this double conical tube, any ordinary double conical tube can be used, but the most preferable ones are D1, D2, d1, d2, l1, l2 and L shown in mm in Fig. 9. is D1>d
1, D2>d2, D1>D2, d1>d2, l2>l1
, L>0 and 60>d1>,10, 50>d2>5
, l1>15.

Further, it is preferable that the double conical tubes 21 and 22 form substantially one plane with their outlet end surfaces.

By using a double conical tube that satisfies these conditions, it becomes possible to effectively control the fiber material 10 for the core portion to a desired position inside the cylindrical fiber material 9 for the sheath portion, and it becomes possible to manufacture the cigarette filter. is extremely easy.

This double conical tube may be one in which two conical tubes are fixed, but the outer conical tube 22 shown in FIG. Rain interlacing can be structured so that it can be moved up and down, and by moving this conical tube, the fiber material for the core portion can be accurately placed at the desired position in the fiber material for the sheath portion. A similar air passage system can also be provided.

The cigarette filter that passes through the double conical tube 6 and is focused into a sheath core type structure is then sent to the winding tube section 13, where it is sent by the drive belt 23 with the winding paper sent out from the supply reel. It is then molded into a filter tip.

The amount of fiber material for the sheath portion to be supplied to the winding tube portion 13 is regulated by the rotation peripheral speed (V1 m/min) of the delivery roll 24, and the amount of fiber material for the core portion to be supplied to the delivery roll 25 is regulated.
The amount of supply to the winding tube section 13 is regulated by the rotation peripheral speed (V2 m/min) of the winding tube section 13, and the shape of the cigarette filter in this winding tube section is determined by the speeds of v1 and v2 as well as the drive 23.
It is also affected by the speed (v3m/min) of 0.7 x V2/V3<V1/V2-0.1<1.2 V
It is preferable to satisfy a relationship such that the inequality 2/V3 [A] holds true.

According to the method of the present invention, slivers and spun rovings, which were conventionally thought to be unusable as materials for cigarette filters, can be used effectively and various filters can be developed.

As the fiber material for the sheath portion used in carrying out the present invention, it is preferable to use long fiber tow made of acetate fiber, rayon fiber, polypropylene fiber, etc., and as the fiber material for the core portion, the above-mentioned long fiber tow is preferably used. Of course, slivers of these fibers, spun rovings, activated carbon fibers, ion-exchangeable fibers grown in the form of sheets, etc. can be used.

The present invention uses a fiber material for a sheath portion and a fiber material for a soldering iron portion,
By changing the type of fiber, changing the thickness of the fiber, changing the packing density, etc., the smoking feeling and aroma of the cigarette can be adjusted as appropriate, and the amount of smoke contained in cigarette smoke can be adjusted accordingly. It is possible to create a cigarette filter that can efficiently remove harmful components other than nicotine and tar, such as low-boiling components and carbon monoxide.

The present invention will be explained in more detail with reference to Examples below.

Example A diacetate tow with a Y-shaped cross section and a total denier of 4.0 dpf and 36,000 was used as the fiber material for the core part, and rayon sliver (about 270 dpf with a fiber of about 58 mm at 2 denier)
00 total denier) as the fiber material for the sheath part, and supplied it to the filter plug manufacturing apparatus shown in Figure 3 at the speeds of v1, V2, and V3 specified in the previous formula [A] as shown in Table 1. , length 102mm, circumference 247
A filter plug of mm was created.

The obtained plug was cut and the cross section was observed, and the results are shown in Table 1.

In addition, using the fiber material for the sheath portion and the fiber material for the core portion, d1, d2, D1, D2l1, l2 shown in FIG.
V1, v2 by changing the values of and L using the apparatus shown in Fig.
, v3 according to the conditions of Experiment No. 1 in Table 1 to produce filter plugs. Table 2 shows the results.

Experiment No. 1 in Table 1 and Experiment No. 3 in Table 2 using the fiber materials for the sheath portion and the fiber materials for the core portion shown in Table 3.
Table 3 shows the results of making a sheath core type cigarette filter using the filter plug manufacturing apparatus shown in FIG. 3 under the conditions shown in FIG. 3, and smoking the filter plug connected to a cigarette.

The smoking conditions were as follows: smoke suction device: constant flow type, smoke duration 2 seconds/time, smoke interval 58 seconds, smoke flow rate 17.5 ml/second, number of smoke puffs 7 times/piece, mainstream smoke collection method: Cambridge filter CM- 113, smoked 20 cigarettes, analysis method: nicotine: conducted using ultraviolet spectrophotometry.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cigarette filter made by the method of the present invention, and FIG. 2 is a lateral sectional view of this filter. FIG. 3 shows an example of the cigarette filter manufacturing apparatus of the present invention, and FIGS. 4, 5, 6, and 7 are the AA' cross section, the BB' cross section, and the BB' cross section in FIG. 3, respectively. 8 is an enlarged perspective view of the double conical tube shown in FIG. 3, and FIG. 9 is a cross-sectional view thereof. 4, 5...Ring-shaped guide, 6...Double conical tube, 1
2... Fiber material for sheath part, 11, 18... Fiber material for core part, 19... Double conical tube outer tube, 20...
Central tube of double conical tube, 21... Outer conical tube, 22...
-Inner conical canal.

Claims (1)

[Scope of Claims] 1. After opening the fiber material of the sheath part that can run continuously, the outer side of the ring-shaped guide is made to run in contact with it to form a cylindrical body, and while it is fed to the outer tube of the double conical tube. A method for manufacturing a sheath core type cigarette filter, characterized in that the core fiber material is bundled into a cylindrical web and fed into the cylindrical web through the center of a double conical tube to be integrated. 2 As a double conical tube, the diameter D of the circle at the entrance of the external conical tube
1 (mm), the diameter of the exit circle is d1 (mm), and the length is l.
1 (mm), and the diameter of the circle at the entrance of the internal conical tube is D2
(mm), the diameter of the exit circle is d2 (mm), and the length is l
2 (mm), D1>d1, D2>d2, D1>D
2, d1>d2, l2>l1, 60>d1>10,50
Claim 1, characterized in that a double conical tube is used that satisfies the conditions that >d2>5, l1>15 and that the end surfaces on the exit side of the double tube form substantially the same surface. The method for manufacturing the sheath core cigarette filter described above.