JPS58165781A - Improvement in tobacco filter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cigarette filter used in smoking devices such as cigarettes.

Filter tip cigarettes equipped with ventilation means for introducing all of the ventilation air into the filter are well known. Its purpose is to reduce the total absorption of smoke components and also to cool the main stream of smoke. When ventilation air enters the filter made of fibrous filter material such as cellulose acetate through the ventilation zone of the chip material at the periphery of the filter, the incoming air confines cigarette smoke to a narrow area of the filter plug. This results in smoke being carried in a relatively narrow stream from the mouth end of the plug into the smoker's mouth and limiting the mixing of ventilation air with tobacco smoke. As a result, only a small amount of smoke cooling occurs.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cigarette filter which allows a smoker to enjoy excellent smoke characteristics and which allows a large portion of the smoke to be better cooled when using the filter.

The present invention is characterized in that the plug has one or more air circulation grooves on its peripheral edge, and the line groove is deep from the inlet end to the outlet end of the groove.
and the wire groove has a longitudinal component that intersects the axis of the plug when the plug is viewed in a developed view, and the wire groove further has an air-permeable outlet surface at its outlet end. The present invention provides a cigarette filter having a rod-shaped plug made of filter material.

BRIEF DESCRIPTION OF THE DRAWINGS In order to understand the invention better and to facilitate its implementation, the following description is given by way of example of schematic drawings.

In the drawings, FIG. 1 shows a filter plug with a helical peripheral air flow groove. Figure 2 shows a cross section of the plug along the line ■--■ in Figure 1 and the chipping wrapper superimposed on it. FIG. 3 shows a part of a filter tip cigarette having a modification of the plug shown in FIG. 1, and FIG. 4 shows a cross section of a filter having a plug of a different shape from the plug shown in FIG. Figure 5 is Figure 4 v-vlfM
A cross-sectional view along .

The filter plug 1 shown in FIG. 1 is made of a filter material made of fibrous cellulose acetate and has self-shape retention. A large number of spiral grooves 2 are provided around the circumference of the plug 10. FIG. 2 shows a cross section of the groove 2 along the length of the groove.

As can be seen from FIG. 2, the depth of the groove increases from the inlet end 3 to the outlet end 4. When attached to a cigarette rod to form a filter tip cigarette, the plug 1 is fixed to the rod (not shown) by the tip material 5. As can be seen from FIG. 2, in this case the cigarette rod is located to the right of plug l. As shown in FIG. 2, a row of holes 6 in the chip material wraps around the plug 110 at a position overlapping the inlet end area of the groove 2, and each groove 2 has at least one hole. The through holes 6 are arranged so as to communicate with each other.

A preferred method for forming the grooves 2 is to cut the plug 1 or (5) or several plugs 1'f by cutting the plug 1'f. 1507765 and the like. By suitably selecting the conditions of the hot forming process, the groove 2 is formed in such a way that its longitudinal surface 7 is substantially impermeable to the air flow and the outlet end face 8 is permeable to the air flow. .

When the filter cigarette of FIGS. 1 and 2 is smoked, ambient air is drawn into the groove 2 through the aperture 6. The groove 2 is a helical passage, and since the depth of the groove 2 increases in the direction of the air flow, the venting air enters the plug 1 with an inward spiral movement of the spiral. This has the effect of improving the mixing of the cigarette smoke passing through the filter plug 1f with the ventilation air.

The cigarette of FIG. 3 is made of a cut tobacco rod 10 wrapped in paper 11 and a filter 12 having a plug 13 attached to the rod (by tipping material 14).The filter plug 13 (6) is The plug 13 differs from the plug 1 of FIG. 1 in that, in addition to having a helical groove 15 in the upstream region, the plug 13 has a number of parallel elongated grooves 16 opening at the mouth end of the plug 13. Similar to groove 2 in FIG. 2, the longitudinal surface of groove 15 is substantially air impermeable and elongated 1fI16
This may also be the case for the surface of. Two rows of holes 17 and 18 surround the plug 13 at a position overlapping the upstream ends of the helical groove 15 and the elongated groove 16, and these grooves 15.1
6. All means for introducing ambient air are provided.

If desired, the plug 13 can be two adjacent small plugs, one of which has a groove 15 and the other an air conduit 16.

When the cigarette of FIG. 3 is smoked, a first stream of peripheral air enters the filter plug 13 from the peripheral groove 15 and is thoroughly mixed with the tobacco smoke by the swirling motion already described. Another stream of air enters the smoker's mouth from the groove 16 without or substantially without mixing with the tobacco smoke.

The filter shown in FIG. 4 has a self-retaining filter plug 2° provided with a single row of annular peripheral edges 21. The grooves 21 each have an inlet end and an outlet end, and are arranged substantially in the normal direction with respect to the axis of the filter plug 2o.

As can be seen from FIG. 5, the grooves 21 each increase in depth towards their outlet end. Outlet end face 22 is air permeable. The other surfaces of groove 21 are substantially air impermeable.

A tip material 23 is attached to the filter plug 2o to attach the plug 20 to a cigarette rod (not shown in FIG. 4).
are superimposed. This chi.

The plug material 23 has a fine hole zone 24 surrounding the plug 2o at a position overlapping the groove 21.

When the filter cigarette of FIGS. 4 and 5 is smoked, ambient air is drawn into the grooves 21 from this microporous zone 24. The air enters the filter plug 20 through the outlet end face 22 of 621 in a helical motion, the helical motion ensuring good mixing of the cigarette smoke with the air. All the ventilation holes may be made of a chip material that has such a microporous zone.If you feel safe, the chip material may be an air-permeable plug wrapper. It is desirable that the plug wrapper as well as the chip material 5 is long.

It should of course be noted that the dimensions of the through holes 6, 17 and 18 shown in the drawings are exaggerated for ease of explanation.

[Brief explanation of the drawing]

Figure 1 shows a filter plug with a spiral air-conducting groove, Figure 2 shows a cross section of the plug along the line ■-■ in Figure 1 and part of the chipping wrapper, and Figure 3 shows a modification of the plug in Figure 1. A part of a filter chip cigarette, FIG. 4 is a cross section of a filter having a plug of a different shape from the plug shown in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line ■-■ in FIG. 4. 1.13.20...Plug, 2.15...Spiral skin, 3...Inlet end, 4...Outlet end, 5,14.23.
...Chip material, 6.17, 18.24...Through hole, 7.
... Length direction surface, 8゜22 ... Outlet end surface, 1o ...
Cigarette rod, 11... (9) Paper, 12... Filter, 16... Elongated groove, 21...
...Annular groove. (10)

Claims (1)

[Claims] 1. One or more grooves (2), (15), (21) increase in depth from the inlet end (3) to the outlet end (4) of the groove;
When viewed from a developed view of the plug (1), it has all the longitudinal components that intersect with the axis of the plug, and furthermore, the groove has an air-permeable origin surface 8.
A cigarette filter comprising a rod-shaped plug of filter material having an outlet end (4) having one or more air flow grooves on its periphery. 2. The filter according to claim 1, wherein the inlet end (3) of the groove (2), (15), (21) is located further from the inlet end of the filter plug (1) than the outlet end (4). 3. The filter according to item 2, wherein the grooves (2) and (15) have a spiral shape. 4. The inlet end and outlet end of the groove (21) are connected to the inlet end of the plug (
20) The filter according to item 1, which is equidistant from the filter. 5. One or more grooves (2) allow air f to be lower than the outlet end face (8)
The filter according to any one of the above items, having side and bottom surfaces that are difficult to pass through. 6. Said having a wrapping (5) (14) (23) for enclosing the plug (1) and introducing all the peripheral air into one or more grooves (2) (15) (21) in the inlet end area of the groove. A filter described in any of the sections. 7. Air groove selection pipe (IS) extending from the mouth end (13) of the plug to near the area where the groove (15) of the plug is provided.
) The filter according to any one of the above items, having V. 8 wrappings (14) provide a first ventilation hole (17) in the inlet end area of one or more grooves (15);
8. A filter according to claims 6 and 7, having a second ventilation hole (18) in the end area remote from the mouth end (13) of the plug. 9. The filter according to item 8, wherein the through holes are micropore zones of the chip material. 10. According to paragraph 7.8 or 9, the plug consists of two adjacent small plugs, one of which has one or more grooves (15) and the other has an air conduit for ventilation. filter.