TWI594703B - "cigarette filter" - Google Patents

Description

Cigarette filter

The present invention relates to a filter for cigarettes.

There is a filter cigarette in which a filter is provided on the suction side of a cigarette. The filter cigarette is connected to the filter through a tip paper at one end of the cigarette rod (winding portion) from which the tobacco yarn is wound by the cigarette paper. Such a filter for cigarettes is formed by wrapping a filter material such as a cellulose acetate bundle into a wrapper.

In recent years, a technique for providing a filter for cigarettes having excellent design has been desired. In connection with this, there has been proposed a technique for the bonding agent for the filter material and the wrapping paper (filter roll paper) for bonding the filter to contain a naturally colored fragrance, thereby providing the filter end face. The characteristic appearance (for example, refer to Patent Document 1).

(previous technical literature) (Patent Literature)

Patent Document 1: International Publication No. 2009/080604

However, I think that it is designed to enhance the design of previous filters. There is also room for improvement. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a filter for cigarettes which is superior in design to the prior art.

In the present invention, in order to solve the above problems, the following means are employed. That is, the filter for cigarettes of the present invention is a filter for cigarettes which is connected to one end of a tobacco rod in which tobacco yarn is wound by a cigarette paper through an outer layer paper, the filter comprising: a filter medium, and a filter The filter paper is wrapped around the outer peripheral surface of the filter material, and the coated paper is coated with the filter material, and the coated surface of the packaged paper is colored. A light penetrating portion formed on the inner side of the filter cross section of the coated surface of the wrapping paper among the suction port ends of the filter.

Here, in the principle of the color of the visible object, when the visible light reflected from the object enters the human eye, the eye feels the difference between the intensity of the light and the wavelength, and is recognized by the operation of the brain. "colour". In the present invention, the visible light reflected by the coated surface of the colored wrapping paper can pass through the light transmitting portion and be discharged to the outside from the suction port end of the filter. In this manner, the reflected light from the coated surface of the colored wrapping paper is transmitted to the eyes of the smoker through the light transmitting portion, whereby the smoker can recognize the color of the colored coated surface. As a result, the design of the filter for cigarettes can be improved as compared with the past. That is, according to the present invention, it is possible to provide a filter for cigarettes which is superior in design to the prior art.

Here, the light penetrating portion may be configured to include a gap between the fibers forming the outer peripheral region of the filter medium in the suction port end of the filter. The gap formed between the fibers constituting the filter medium functions as a light transmitting portion, whereby the reflected light from the coated surface of the colored wrapping paper can be appropriately transmitted to the smoker The eye and allows the smoker to recognize the color of the covered surface.

Further, as described above, when the gap formed between the fibers constituting the filter medium functions as the light transmitting portion, the density of the fiber layer in the outer peripheral region of the filter medium may be set closer to the center of the filter medium than the outer peripheral region. The fiber layer density in the inner peripheral region of the shaft side is relatively small. In this way, the density of the fiber layer in the outer peripheral region of the filter medium is made small, whereby the transmittance of the visible light reflected on the coated surface of the wrapped paper to the gap between the fibers constituting the filter medium can be appropriately increased, and the transmittance can be improved. The color of the colored coated surface is identified.

Further, the light transmitting portion may be configured to include a gap portion formed between the covering surface of the wrapping paper and the outer peripheral surface of the filter medium at the suction port end of the filter. In this manner, the gap portion formed between the coated surface of the wrapped paper and the outer peripheral surface of the filter medium functions as a light transmitting portion, whereby the reflected light from the coated surface of the colored wrapped paper can be appropriately It is delivered to the eye of the smoker and allows the smoker to identify the color of the covered surface.

Here, the coated surface of the wrapped paper is joined to the outer peripheral surface of the filter medium in one of the circumferential directions of the filter medium, and the gap portion is formed in the suction port end of the filter, and may be formed on the roll paper. The non-joining region where the coating surface is not joined to the outer peripheral surface of the filter medium. Thereby, a gap portion can be appropriately formed between the coated surface of the wrapped paper and the outer peripheral surface of the filter medium.

Further, the bonding agent for joining the coated surface of the wrapped paper and the outer peripheral surface of the filter medium may be applied along the longitudinal direction of the filter, and the bonding agent may be formed on the suction port end of the filter. The uncoated region is formed by forming the gap portion over the entire circumference of the suction port end. Thereby, the light penetrating portion can be formed in a ring shape and spread over the entire circumference of the suction port end of the filter. The result can be even more The color recognition of the coated surface of the colored wrapping paper is improved, and the design of the filter can be further improved.

Further, the light penetrating portion may be configured to include a transparent film layer stacked on the coated surface of the wrapping paper in the suction port end of the filter. Thereby, since the transparent film layer can be interposed between the coating surface of the wrapped paper and the outer peripheral surface of the filter material, the same effect as the case where the gap portion is provided can be achieved. That is, by the transparent film layer, visible light can be transmitted through the reflected light reflected on the coating layer of the wrapped paper. Thereby, when the smoker views the suction port end of the filter, the visible light reflected on the coated surface of the wrapped paper can be transmitted to the eyes of the smoker well, and the smoker can appropriately recognize the colored roll. The color of the covered surface of the wrapping paper.

Further, the roll paper may be colored by printing a printing ink onto the coated surface. Thereby, in the manufacturing step of the cigarette, it is possible to suppress the ink from falling off during the treatment or to elute the ink due to the saliva of the smoker or the like during smoking.

Further, the means for solving the problems of the present invention are used in combination as much as possible.

According to the present invention, it is possible to provide a filter for cigarettes which is superior in design to the prior art.

1‧‧ ‧ Cigarettes

2‧‧‧ cigarette rod

3‧‧‧ outer paper

4, 4A, 4B, 4C‧‧‧ filter

5‧‧‧Light penetration

6‧‧‧Transparent coating

21‧‧‧Tobacco

22‧‧‧ cigarette paper

31‧‧‧ vents

40‧‧‧Inhalation end

41, 141‧‧ ‧ filter section

41a‧‧‧peripheral area

41b‧‧‧ Inner Week Area

42‧‧‧Filter roll paper

42a, 42b‧‧‧adhesive area

43‧‧‧1st bonding agent

44‧‧‧2nd bonding agent

45‧‧‧Printing ink

46‧‧‧Uncoated area

50‧‧‧ gap section

410, 421‧‧‧ outer perimeter

411‧‧‧ fiber

412‧‧‧ gap

420‧‧‧ Covered

Rb‧‧‧ joint area

Rnb‧‧‧ non-joined area

Fig. 1 is a side view of the cigarette of the first embodiment.

Fig. 2 is a view showing a schematic structure of a cigarette of the first embodiment.

Figure 3 is a view showing the joining of the filter paper and the filter section of the first embodiment. The picture of the pattern.

Fig. 4 is a view showing a filter in a state in which the filter section is wrapped by a filter roll in the first embodiment.

Fig. 5 is a view for explaining a filter of a first modification.

Fig. 6 is a view showing a schematic configuration of a filter of a first modification.

Fig. 7 is a view showing a schematic configuration of a filter of a second modification.

Fig. 8 is a view showing a schematic configuration of a filter of the second embodiment.

Here, an embodiment of the filter for cigarettes of the present invention will be described based on the drawings. In addition, the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements described in the present embodiment are not limited to the technical scope of the present invention by the above description unless otherwise specified.

<Embodiment 1>

Fig. 1 is a side view of the cigarette 1 of the first embodiment. Fig. 2 is a view showing a schematic structure of the cigarette 1 of the first embodiment. Fig. 2 is a cross-sectional view showing a part of the cigarette 1. The cigarette 1 has a cigarette rod 2 and a filter 4 connected to one end of the cigarette rod 2 through a tip paper 3. The cigarette rod 2 is obtained by winding the tobacco yarn 21 with the cigarette paper 22, and is formed into a cylindrical shape (rod shape). The cigarette rod 2 is also referred to as a "single roll portion". Further, the filter 4 is formed into a columnar shape (rod shape) as shown in Fig. 1 . The arrow A of Fig. 1 shows the long axis direction of the cigarette 1 (cigarette rod 2, filter 4). Hereinafter, in the present specification, a cross section orthogonal to the long axis of the cigarette 1 (cigarette rod 2, filter 4) is referred to as a "cross section" in the following.

The filter 4 is a member for filtering the smoke component contained in the mainstream smoke generated when the cigarette 1 is smoked. Hereinafter, in the filter 4, An end portion of the cigarette rod 2 is referred to as a "connection end", and an end portion opposite to the connection end is referred to as a "suction port end 40". The suction port end 40 of the filter 4 is the end of one of the smokers who is caught by the smoker when smoking.

The filter 4 includes a filter section 41 belonging to a filter medium (filter material), and a filter roll paper 42 as a roll paper wrapping the filter section 41. The filter section 41 is, for example, a fiber bundle in which acetate fibers are formed into a cylindrical shape. The filter roll paper 42 is air permeable. As shown in Fig. 2, in the suction port end 40 of the filter 4, the end face of the filter roll paper 42 is flush with the end face of the filter section 41.

The cigarette rod 2 and the filter 4 are wound by the outer layer paper 3 and integrally connected. The outer layer paper 3 is bonded to the filter roll paper 42 and the cigarette paper 22 so as to cover the entire outer circumference of the filter roll paper 42 of the filter 4 and to cover the end side of the cigarette paper 22 of the cigarette rod 2. In the region of the outer layer paper 3 covering the filter 4, a vent hole 31 for introducing a gas (air) for diluting the mainstream smoke into the filter 4 is provided. The vent hole 31 is an introduction hole for the outside air for ventilation, and a plurality of the outer layer paper 3 are provided. The presence or absence of the vent hole 31 of the outer layer paper 3 is arbitrarily set, and the arrangement of the vent hole 31 can be appropriately changed. Further, since the filter roll paper 42 has air permeability, the outside air passing through the vent hole 31 of the outer layer paper 3 is introduced into the inside of the filter 4 by penetrating the filter roll paper 42.

Fig. 3 is a view for explaining the joined state of the filter roll paper 42 and the filter segment 41 of the first embodiment. The symbol 420 shown in FIG. 3 is a coating surface that is coated so as to face the outer peripheral surface 410 of the filter segment 41 when the filter segment 41 is wrapped. Further, in the filter roll paper 42, a surface opposite to the coated surface is referred to as an outer peripheral surface 421. Further, the outer circumferential surface 421 of the filter roll paper 42 is a surface joined to the outer layer paper 3.

In the present embodiment, the coated surface 420 of the filter roll paper 42 is colored by printing. Reference numeral 45 shown in Fig. 3 denotes printing ink applied to the entire surface of the coating surface 420 of the filter roll paper 42. The type of the printing ink 45 may be a gravure ink, a flexographic ink or the like. In the present embodiment, the coated surface 420 of the filter roll paper 42 is colored in one color, but may be colored using a plurality of colors. Further, when the colored ink is printed on the coated surface 420 of the filter roll paper 42 by gravure printing, it is preferable that the filter roll paper 42 has physical properties excellent in gravure printing as shown below. For example, the filter roll paper 42 preferably has a smoothness of the coated surface 420 of 80 [sec] or more, and more preferably 150 [sec] or more. Further, the filter roll paper 42 preferably has a basis weight of 25 [gms] or more, and more preferably 30 [gms] or more. Further, the filter roll paper 42 is preferably set to have a Stockigt sizing degree of 2.8 [sec] or less. Further, it is preferable that the coating surface 420 of the filter roll paper 42, that is, the printing target surface on which the colored ink is to be printed, is coated with a coating agent such as starch before printing. In this manner, the colored ink is printed on the surface of the printing target coated with the coating agent, whereby the coloring effect of the colored ink can be improved. Further, as described above, the coating agent is applied to the printing target surface of the filter roll paper 42, whereby the printing target surface can be provided with sizing property and water resistance.

In the present embodiment, the printing ink 45 is printed on the coating surface 420 of the filter roll paper 42 to be colored. Therefore, in the manufacturing process of the cigarette 1, there is no ink drop during the processing, or in the cigarette 1 It is preferable that the ink is eluted due to the saliva of the smoker or the like during smoking. However, the method of coloring the coating surface 420 of the filter roll paper 42 is not limited to the printing technique, and for example, a dyeing technique using a dye may be used. For example, the base paper sheet of the filter roll paper 42 is immersed in an aqueous solution in which the pigment is dissolved in water, whereby the fibers of the base paper board can be colored as a pigment. (dye) for coloring. Further, in the case of producing a wrapper, the pigment may be previously mixed with the fiber, and the paper may be colored in the papermaking step.

Further, as shown in Fig. 3, the filter roll paper 42 has a rectangular shape. On the long sides of one of the filter roll papers 42, there are formed pasting regions 42a, 42b which are overlapped with each other when the filter portion 41 is wrapped. The length of the long side of the filter roll paper 42 is substantially equal to the length of the filter section 41 in the axial direction. The long side of the filter roll paper 42 is disposed along the long axis direction A of the cigarette 1 after the cigarette 1 is manufactured. A bonding agent (hereinafter referred to as "first bonding agent") 43 is applied to the coating surface 420 side of the adhesive region 42a of the filter roll paper 42. In the manufacturing step of the cigarette 1, when the filter section 41 is wrapped by the filter roll paper 42, the coated surface 420 of the filter roll paper 42 is wound along the outer peripheral surface 410 of the filter section 41. At this time, the adhesive region 42a on the coating surface 420 side of the filter roll paper 42 is superposed on the adhesive region 42b on the outer peripheral surface 421 side, whereby the adhesive regions 42a and 42b are joined to each other by the first bonding agent 43. . As a result, the filter roll paper 42 is shaped into a cylindrical shape.

Further, as shown in FIG. 3, in the intermediate portion of the coating surface 420 of the filter roll paper 42, a bonding agent is applied along the longitudinal direction of the filter roll paper 42 (hereinafter referred to as "second bonding agent"). ) 44. The second bonding agent 44 is a bonding agent for bonding the coating surface 420 of the filter roll paper 42 to the outer circumferential surface 410 of the filter segment 41. As shown in Fig. 3, the lateral width of the second bonding agent 44 (indicated by symbol W1 in Fig. 3) is set to a part of the short side of the filter roll paper 42, for example, set to a fraction of a few A size of about one tenth. Then, in the manufacturing step of the cigarette 1, the covering surface 420 of the filter roll paper 42 is wound along the outer peripheral surface 410 of the filter segment 41, whereby the coated surface 420 of the filter roll paper 42 and the filter segment The outer peripheral surface 410 of 41 is joined by the second bonding agent 44.

Fig. 4 is a view showing the filter 4 in a state in which the filter section 41 is wrapped by the filter roll paper 42 in the first embodiment. Fig. 4 shows the state of the suction port end 40 of the filter 4 (filter section 41). The broken line shown on the inner side of the filter roll paper 42 shown in Fig. 4 indicates the colored coated surface 420 and corresponds to the inner surface of the filter roll paper 42. Further, as shown in the drawing, the covering surface 420 of the filter roll paper 42 is partially joined to the outer peripheral surface 410 of the filter segment 41 by the second adhesive 44.

The symbol Rb in Fig. 4 is shown in the boundary portion 40 of the filter 4, and is formed in the boundary portion (interface) between the filter segment 41 and the circumferential direction of the filter roll paper 42. The joining area of the second bonding agent 44 is provided. Further, the symbol Rnb indicates a non-joining region in which the second bonding agent 44 is not disposed in the boundary portion between the filter segment 41 and the filter roll paper 42. As shown in the figure, the filter roll paper 42 is joined to the outer peripheral surface 410 of the filter segment 41 in the joint region Rb formed in one of the circumferential directions of the filter segment 41.

Here, the non-joining region Rnb formed in the suction port end 40 of the filter 4 is not bonded to the outer circumferential surface 410 of the filter segment 42 by the coating surface 420 of the filter paper 42. Therefore, as shown in FIG. 4, a portion corresponding to the non-joining region Rnb of the suction port end 40 is formed with a gap portion 50 belonging to the gap region (hollow region) between the outer peripheral surface 410 and the covering surface 420.

As described above, the filter 4 of the present embodiment is formed in the non-joining region Rnb of the suction port end 40, and the gap portion 50 is formed inside the filter cross section of the coating surface 420 of the filter roll paper 42, that is, A gap portion 50 is formed between the filter roll paper 42 and the filter segment 41. The gap portion 50 is emitted as a light penetrating portion 5 through which reflected light that is reflected by the visible surface of the filter roll paper 42 is reflected. Wave function. Here, the light penetrating portion 5 formed by the gap portion 50 of the filter 4 is positioned at the end portion on the suction port side in the longitudinal direction of the filter 4, that is, at the suction port end 40. Therefore, the visible light outside the cigarette 1 is radiated toward the covering surface 420 of the filter roll paper 42 through the light transmitting portion 5, and the visible light reflected by the covering surface 420 penetrates the light transmitting portion 5 again. Release to the outside. Then, the visible light reflected by the covering surface 420 of the filter roll paper 42 is transmitted to the eyes, whereby the color of the covering surface 420 can be recognized.

Further, since the filter segment 41 is a fiber bundle for molding the fibers constituting the filter medium, the visible light reflected in the coated surface 420 of the filter roll paper 42 can be formed from the outer peripheral region 41a of the filter segment 41. The gaps 412 of the fibers 411 penetrate each other toward the outside of the end face side of the suction port. Therefore, similarly to the reflected light from the covering surface 420 of the filter roll paper 42 which is discharged to the outside through the gap portion 50, the fibers 411 penetrating the outer peripheral region 41a of the filter segment 41 are separated from each other by the gap 412. The reflected light from the covering surface 420 that is released to the outside is transmitted to the eyes of the smoker, whereby the smoker can recognize the color of the covering surface 420.

As described above, the filter 4 of the present embodiment is attached to the suction port end 40, and the inside of the filter cross section of the coating surface 420 of the filter roll paper 42 is provided with a coating for allowing visible light to penetrate the filter roll paper 42. The light penetrating portion 5 of the reflected light reflected by the surface 420. Further, in the filter 4 of the present embodiment, the gap portion 50 formed between the covering surface 420 of the filter roll paper 42 and the outer peripheral surface 410 of the filter segment 41, and the outer peripheral region forming the filter segment 41 are included. The fibers 411 of 41a form a light penetrating portion 5 with a gap 412 therebetween. Thereby, when the smoker views the filter 4 from the suction port end 40 side, the reflected light is reflected by the light transmitting portion 5 and transmitted to the smoker through the light penetrating portion 5 when the visible light is reflected by the coated surface 420 of the filter roll paper 42. Eye, but can suck The smoker identifies the color of the colored coated surface 420. As a result, the design of the filter 4 and the cigarette 1 in which the filter 4 is incorporated can be improved as compared with the past. In other words, the filter 4 and the cigarette 1 which are superior in design to the prior art can be provided.

Further, according to the filter 4 having the above configuration, the reflected light from the covering surface 420 of the filter roll paper 42 can be diffusely reflected by the fibers 411 forming the outer peripheral portion 41a of the filter segment 41. Thereby, since the visible light reflected by the covering surface 420 is diffused, it is possible for the smoker to more easily recognize the color of the colored coated surface 420.

As described above, the filter 4 of the present embodiment includes the gap portion 50 and the gap portion 412 to form the light penetrating portion 5, but the light penetrating portion 5 may be formed by any of the portions. That is, any of the gap portion 50 and the gap portion 412 can be independently used in the means for forming the light penetrating portion 5. For example, in the suction port end 40 of the filter 4, even when the covering surface 420 of the filter roll paper 42 and the outer peripheral surface 410 of the filter segment 41 are integrally joined or the like, and the gap portion 5 is not particularly provided, The light penetrating portion 5 may be formed by the gap 412 between the fibers 411 forming the outer peripheral region 41a of the filter segment 41, and the reflected light from the colored coated surface 420 may pass through the light penetrating portion 5 (gap 412) is passed to the eye of the smoker. Thereby, the smoker can be made to recognize the color of the colored coated surface 420, and the design of the filter 4 can be improved.

<First variation>

Next, the filter 4A of the first modification will be described. As shown in Fig. 5, in the first modification, in the longitudinal direction of the coating surface 420 of the filter roll paper 42, one end region of the edge portion of the suction port end 40 is formed after the filter is molded. The uncoated region 46 to which the second bonding agent 44 is not applied is provided. In addition, the second bonding agent The 44 is applied along the longitudinal direction of the coating surface 420 of the filter roll paper 42. At this time, the second bonding agent 44 may be applied to the coated surface 420 in a strip shape, or may be applied in a spiral shape or a wave shape.

As shown in the present modification, when the second bonding agent 44 is applied along the longitudinal direction of the covering surface 420 (the long axis direction after the filter is formed), the end portion corresponding to the suction port end 40 is formed. In the coating region 46, after the filter 4A is formed, the non-joining region Rnb can be formed throughout the entire circumferential direction (full circumference) of the suction port end 40 of the filter 4A. In other words, the gap portion 50 can be formed annularly throughout the entire circumferential direction (full circumference) of the suction port end 40 of the filter 4A. As a result, as shown in Fig. 6, the light penetrating portion 5 for allowing the reflected light from the colored coated surface 420 to be transmitted to the outside can be formed into a ring shape and extending over the circumferential direction of the filter 4A. All regions. Therefore, the range in which the light penetrating portion 5 is formed can be enlarged as compared with the example shown in FIG. Thereby, the color recognition of the colored coated surface 420 can be further improved, and the design of the filter 4A can be further improved.

<Second variation>

Next, the filter 4B of the second modification will be described. Fig. 7 is a view showing a schematic configuration of a filter 4B according to a second modification. Fig. 7 is a view showing the configuration of the position of the suction port end 40 of the filter 4B. In Fig. 7, reference numeral 141 is a filter segment of the second modification. The structure of the filter 4B of the second modification is different from that of the above embodiment. In the following, the description will be centered on the differences described above.

The filter segment 141 includes an outer peripheral region 41a including the outer periphery 410, and an inner peripheral region 41b located closer to the inner side (the filter medium center side) than the outer peripheral region 41a. Here, the technical significance of the inner peripheral region 41b and the outer peripheral region 41a is Line description. The outer peripheral region 41a of the filter segment 141 is formed as a low-density layer having a fiber layer density which is relatively smaller than the inner peripheral region 41b. The inner peripheral region 41b has a fiber layer density equivalent to that used for a normal cigarette filter.

The fiber layer density of the inner peripheral region 41b of the filter segment 141 is adjusted, for example, within a range that satisfies the filtration performance required to filter the smoke component contained in the mainstream smoke. On the other hand, the outer peripheral region 41a of the filter segment 141 has a visible light that is reflected by the covering surface 420 of the filter roll paper 42 as a gap 412 between the fibers 411 forming the outer peripheral region 41a. And the function of transmitting the transmitted visible light to the light transmitting portion 5 of the smoker's eye; and filtering the filtering function of the smoke component contained in the mainstream smoke. Further, when the outer peripheral region 41a of the filter segment 141 functions as the light penetrating portion 5, it is advantageous to make the fiber layer density of the outer peripheral region 41a as low as possible from the viewpoint of improving the transmittance of visible light. .

Therefore, in the second modification, the fiber layer density of the outer peripheral region 41a of the filter segment 141 is set to be in the range of 0.05 to 0.12 [g/cm ³ ]. However, the above range of the fiber layer density of the outer peripheral region 41a is only an example, and is not limited to the range. In the present modification, the outer peripheral region 41a of the filter segment 141 is formed as a low-density layer having a fiber layer density which is relatively smaller than the inner peripheral region 41b, whereby the coating surface on the filter roll paper 42 can be appropriately raised. The reflected visible light penetrates the transmittance formed in the gap 412 between the fibers 411 constituting the outer peripheral region 41a of the filter segment 141, and the color of the colored coated surface 420 can be well recognized. Further, in the present modification, even if the fiber layer density of the outer peripheral region 41a of the filter segment 141 is made smaller from the viewpoint of ensuring the transmittance of visible light, the fiber of the inner peripheral region 41b can be made. The layer density is relatively higher than the peripheral region 41a, ensuring the filtration performance required for the filter as a whole.

<Embodiment 2>

Next, the filter 4C of the second embodiment will be described. Fig. 8 is a view showing a schematic configuration of the filter 4C of the second embodiment. Fig. 8 is a view showing the configuration of the position of the suction port end 40 of the filter 4C. In the filter 4C, the filter segment 41 and the filter roll paper 42 are common to the filter 4 of the first embodiment. In the present embodiment, the transparent coating layer 6 which is a transparent coating layer which is stacked on the colored coating surface 420 of the filter roll paper 42 is formed. The transparent film layer 6 stacked on the coated surface 420 of the filter roll paper 42 is opposed to the outer peripheral surface 410 of the filter segment 41, and is interposed between the coated surface 420 of the filter roll paper 42 and the outer peripheral surface of the filter segment 41. Between 410.

The transparent film layer 6 interposed between the coating surface 420 of the filter roll paper 42 and the outer peripheral surface 410 of the filter segment 41 functions as the light-transmitting portion 5 in the same manner as the gap portion 50 of the first embodiment. And play the function. That is, the transparent film layer 6 penetrates the reflected light which is reflected by the visible light in the coating surface 420 of the filter roll paper 42. Thereby, when the smoker views the suction port end of the filter 4, the visible light reflected on the covering surface 420 of the filter roll paper 42 can be transmitted to the eyes, and the smoker can recognize the colored coated surface 420. colour.

The transparent coating layer 6 can be formed, for example, by thickening the coated surface 420 of the filter roll paper 42 with a transparent varnish. At this time, from the viewpoint of ensuring the transmittance of visible light reflected on the coated surface 420, it is preferable to ensure the thickness of the varnish to be about 50 μm. Further, the transparent film layer 6 may be formed by attaching a transparent film such as a cellulose film to the coated surface 420 of the filter roll paper 42. At this time, from the viewpoint of ensuring the transmittance of visible light reflected on the coated surface 420, It is preferable to ensure the film thickness to be about 40 μm. However, the above varnish thickness and film thickness are merely illustrative, and the scope of application is not limited to these values.

Further, in the present embodiment, the transparent coating layer 6 is stacked on the covering surface 420 of the filter roll paper 42, whereby the bonded surface of the filter roll paper 42 and the outer peripheral surface of the filter segment 41 are joined. In the same manner, the light penetrating portion 5 corresponding to the thickness of the transparent film layer 6 can be formed between the covering surface 420 and the outer peripheral surface 410. Therefore, as shown in the first embodiment, the non-joining region Rnb is not formed on the joint surface of the coating surface 420 and the outer circumferential surface 410 of the suction port end 40. That is, even if the covering surface 420 and the outer peripheral surface 410 are joined over the entire circumference of the filter 4 of the suction port end 40, the light penetrating portion 5 can be appropriately formed by the transparent film layer 6.

Although the preferred embodiments of the present invention have been described above, those skilled in the art can understand that the filter for cigarettes of the present invention can be variously modified, improved, combined, and the like.

4‧‧‧Filter

5‧‧‧Light penetration

40‧‧‧Inhalation end

41‧‧‧Filter section

41a‧‧‧peripheral area

42‧‧‧Filter roll paper

44‧‧‧2nd bonding agent

50‧‧‧ gap section

410‧‧‧ outer perimeter

411‧‧‧ fiber

412‧‧‧ gap

420‧‧‧ Covered

Rb‧‧‧ joint area

Rnb‧‧‧ non-joined area

Claims (6)

A filter for cigarettes, which is connected to one end of a tobacco rod around which tobacco yarn is wound by a cigarette paper, and the filter for cigarettes is provided with a filter medium disposed at a suction port end of the filter; And the wrapper wraps the filter medium so as to cover the outer peripheral surface of the filter material; the coated surface of the wrapper coated with the filter medium is colored, and is further provided in the suction port end of the filter a light penetrating portion formed on the inner side of the filter cross section of the coated surface of the wrapped paper, wherein the light transmitting portion is configured to include a gap between fibers forming the outer peripheral region of the filter medium in the suction port end of the filter The density of the fiber layer in the outer peripheral region of the filter medium is adjusted to be relatively smaller than the density of the fiber layer in the inner peripheral region closer to the central axis side of the filter medium than the outer peripheral region, so that the coating layer is reflected on the coated surface. The visible light penetrates through the gap between the fibers forming the outer peripheral region. A filter for cigarettes, which is connected to one end of a tobacco rod around which tobacco yarn is wound by a cigarette paper, and the filter for cigarettes is provided with a filter medium disposed at a suction port end of the filter; And the wrapper wraps the filter medium so as to cover the outer peripheral surface of the filter material; the coated surface of the wrapper coated with the filter medium is colored, and is further provided in the suction port end of the filter a light penetrating portion formed on the inner side of the filter cross section of the coated surface of the wrapped paper, wherein the light transmitting portion is configured to include a coating formed on the wrapping paper at a suction port end of the filter a gap portion between the surface and the outer peripheral surface of the filter medium. The filter for cigarettes according to the second aspect of the invention, wherein the coated surface of the wrapped paper is joined to an outer peripheral surface of the filter medium in a portion of the filter medium in a circumferential direction; and the gap portion is filtered by the filter. In the suction port end of the device, a non-joining region where the coated surface of the wrapped paper and the outer peripheral surface of the filter medium are not joined is formed. The filter for cigarettes according to the third aspect of the invention, wherein the bonding agent for joining the coated surface of the wrapped paper and the outer peripheral surface of the filter medium is coated along the long axis direction of the filter. And forming an uncoated region where the bonding agent is not applied to the suction port end of the filter, thereby forming the gap portion over the entire circumference of the suction port end. The filter for cigarettes according to any one of claims 1 to 4, wherein the light penetrating portion is configured to include a stack of the aforementioned wrapping paper in a suction port end of the filter. The transparent coating layer of the coated surface. The filter for cigarettes according to any one of claims 1 to 4, wherein the packaged paper is colored by printing a printing ink onto the coated surface.