JPS6126352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cigarette filter for use in smoking implements such as cigarettes.

Filter tip cigarettes equipped with ventilation means for introducing ventilation air into the filter are well known, the purpose of which is to reduce smoke components in the main stream of smoke. When ventilation air enters a filter made of fibrous filter material such as cellulose acetate through the ventilation zone at the periphery of the filter, cigarette smoke flows in an axial direction with a diameter smaller than the diameter of the end face of the filter plug. It is known that the amount of water is removed from the filter. This relatively narrow smoke stream results in only hitting a limited area of the taste sensation within the smoker's mouth. SUMMARY OF THE INVENTION It is an object of the present invention to provide a cigarette filter which stimulates a large area of the taste sensation in the smoker's mouth when the filter is in use.

That is, the present invention provides a rod-shaped plug made of a filter material, which has one or more air conduction tubes on the peripheral edge of the plug, and the one or more air conduction tubes have an outlet opening at a suction end of the plug at a position far from the suction end. 1. A cigarette filter, characterized in that the one or more air conducting tubes have an area of gradually decreasing depth along the air conducting tube towards the mouth end of the plug. It is.

Conveniently, the area of decreasing depth of the one or more air conduit tubes extends substantially to the inlet end of the plug, and the air conduit tubes are plural, each extending around the periphery of the filter plug. and an inner surface of the wrapping means surrounding the filter plug. In this case, the groove width may be constant, or may increase or decrease toward the suction end of the filter plug.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the invention and facilitate its implementation, an example of the invention will be explained below using schematic drawings.

In the drawings, FIG. 1 is a partial axial cross-sectional view of a filter tip cigarette, FIG. 2 is a mouth end of the cigarette filter shown in FIG. 1, and FIG. 3 is a mouth end of a different filter from that shown in FIG. FIG. 4 is a partially exploded view of the peripheral surface of another type of filter plug.

The cigarette shown in Fig. 1 consists of a cut tobacco rod wrapped in cigarette paper 2 and a filter 3 including a self-shape filter plug 4 made of fibrous cellulose acetate filter material. There are parallel, axially extending grooves 5 (eight in the drawing, FIG. 2). 1st
As can be seen from the figure, the groove 5 is shorter than the overall length of the plug and is provided from the mouth end of the plug 4, decreasing in depth towards the mouth end of the plug substantially up to the mouth end. It is made in A convenient method for forming the grooves 5 is to heat form the plug 4, or preferably a long filter rod from which several plugs are made, using suitable forming means, such as in British Patent Specification No. 1507765. It is to attach. The surface of the groove 5 may be made impermeable.

To attach the filter 3 to the cigarette rods 1, 2, a tip 7 is used which, in the region overlapping the groove 5, forms an air conduit 8 together with the wall of the groove 5. The ventilation holes 9 in the chip material 7, which are exaggerated in the drawing, surround the plug 4 at a position overlapping the upstream end of the groove 5, so that each air conduit 8 communicates with one or more ventilation holes 9. has been done.

When the cigarette of FIG. 1 is smoked, ambient air is drawn into the air conduit 8 through the ventilation holes 9. The air exits through the conduit 8 without or substantially without mixing with the cigarette smoke. The groove 5 forming part of the air conduit 8 decreases in depth in the direction of the air flow along the conduit 8 so that when the air leaves the conduit 8 and enters the smoker's mouth it is circular. The velocity component is directed outward. Thus, due to the Coanda effect, a shunt of air with smoke exiting from the mouth end of the filter plug 4 is formed, resulting in the smoke impinging on a relatively wide range of taste-perceiving areas in the smoker's mouth. It is perceived by smokers as an improvement in the characteristics of smoke.

The filter, the mouth end of which is shown in FIG. 3, consists of a plug 4' having only one annular circumferential groove 5' instead of multiple longitudinal circumferential grooves. The axial cross-section of the plug 4' has a contour similar to that of the groove 5 of the plug 4 in FIG. A strong outer tube wrapper or mouthpiece 7' made of plastic material or the like accommodates the plug 4' and receives the cigarette rod end in a manner similar to the cigarette tip 7 of FIG. The outer tube 7' is made of high strength so that the annular suction opening of the air-conducting tube 8' indicated by 6, which is constituted by the annular groove 5' and the outer tube 7', will not be closed when the filter is used. It has to be something.

The effect obtained by the filter of FIG. 3 is similar to that of filter 3 of FIGS. 1 and 2.
When the peripheral air is drawn into the air conduit 8 through the wrapper or the through hole (not shown) in the mouthpiece 7', the air is divided into channels due to the formation of the groove 5' and enters the smoker's mouth. This is because the smoke collides with the taste detection area over a wide range.

FIG. 4 shows a developed view of the peripheral groove, which can be used in place of the axially extending groove of the filter of FIG. 1 or the single annular groove 5' of the filter of FIG. 3. . In FIG. 4, numeral 10 indicates the suction end of the filter plug 11. The first set has peripheral parallel grooves 13 that are slightly offset from the axial direction of the plug 11, and the second set of grooves 14 are offset in the opposite direction by the same angle. These two sets of groove groups 13 and 14 intersect to form a network structure. As in the case of a single type of groove 5, the grooves 13, 14 each have an area that decreases in depth in the direction of the mouth end 10 of the plug 11 substantially up to the mouth end. When in use, the plug 11 is wrapped with a chip material, and the grooves 13 and 14 provided in the plug 11 constitute an air conduit, and the outlet opening of the air conduit is placed at the suction end 10 of the plug 11 at a position far from the suction end. By having an inlet opening in the filter and allowing ambient air to enter the air conduit, the smoke diffusion effect from smoking is achieved in the same manner as in the case of the filters already described.

The wrapping means of the filter plug consists of a permeable plug wrapper on the outer periphery of the plug and a longer impermeable tip material superimposed on the plug wrapper for fixing the filter plug to the tobacco rod 2. In this case, the ventilation holes are only provided in the impermeable chip material.

If necessary, the filter plug may consist of two small plugs, one of which is connected to grooves 5 and 1.
3, 14 or a single annular groove 5', the other being a smooth surface. The ventilation holes may also consist of microporous zones in the chip material.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view in the axial direction of a filter chip cigarette; Fig. 2 is a suction end of the cigarette filter shown in Fig. 1; FIG. 4 is a partially exploded view of the peripheral surface of a filter plug of another shape. 1... Cigarette rod, 2... Cigarette paper, 3... Filter, 4, 4', 10... Filter plug, 5, 5', 13, 14... Groove, 6... Mouth opening, 7... Tip material, 7'... Outer pipe , 8, 8' air conducting pipe, 9... ventilation hole, 10... suction end.

Claims (1)

[Scope of Claims] 1. A rod-shaped plug made of filter material, having one or more air conduction tubes on the peripheral edge of the plug, the one or more air conduction tubes having an outlet opening at the suction end of the plug. 1. A cigarette filter having an inlet opening remote from the plug, the one or more air conduit tubes gradually decreasing in depth along the air conduit tubes towards the mouth end of the plug. 2. A filter according to claim 1, comprising a wrapping tip material surrounding the plug and introducing peripheral air into the one or more air conduit tubes at a location remote from the inlet end of the plug. . 3 There are two sets of air conducting tubes, the first set of air conducting tubes is spiral in one direction, the second set of air conducting tubes is spiral in the opposite direction, and the first set of air conducting tubes is spiral in one direction; one or more of the conduit tubes intersect the plurality of air conduit tubes of the second set, each air conduit tube of each set having an inlet end deeper than the outlet end, and from the inlet end toward the outlet end; 3. The filter according to claim 1, wherein the depth of the air conducting tube gradually decreases. 4. An air conduction pipe is provided in an annular shape around the plug,
3. The filter according to claim 1, which has an annular air-conducting pipe that is shallower on the suction end side of the plug and deeper on the opposite side.