JP3002172B2 - Method and apparatus for manufacturing sheath-core type tobacco filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cigarette filter for smoking, and more particularly to a method and an apparatus for manufacturing a sheath-core type tobacco filter comprising two or more filter materials.

[0002]

2. Description of the Related Art With the recent trend toward health, the preference of tobacco smokers has shifted from high evening products to medium tar products, from middle evening products to low tar products, and to ultra low evening products. ing. As such ultra-low tar products, tar products of 3 mg / line or less, and further, products of 1 mg / line are marketed. The design of early ultra-low dinner products relied on increasing air inflow from chip paper, but in recent years,
By changing the structure of the wrapping paper and the filter in consideration of the flammability, the design has been changed to realize a low tar without impairing the so-called crispness (taste). The cigarette having such a filter structure is disclosed in Japanese Patent Publication No. 55-400.
Japanese Patent Publication No. 36 (1995) discloses an inner cylindrical body and an outer annular layer, in which the tension applied to the material of the inner cylindrical body is made larger than the tension applied to the material of the outer annular layer, thereby controlling the filling amount of each material and reducing the resistance. A cigarette filter comprising an inner cylindrical body and a high resistance outer annular layer is disclosed. Japanese Patent Publication No. Sho 58-6467 discloses a method for manufacturing a cigarette filter having a sheath-core structure, in which a sheath fiber material is formed into a cylindrical body by a ring guide, and the core filter material is combined with a filter material. A method for manufacturing a filter integrated by passing the same through a double conical tube is disclosed. Further, Japanese Patent Application Laid-Open No. 7-75540 discloses a method and an apparatus in which a treated tow and a crimped paper are laminated in two layers and formed into a concentric cigarette filter in a combined state.

[0003] In order to manufacture such a filter having a sheath-core structure, a filter material for a core portion and a filter material for a sheath portion are generally formed in a concentric two-layer structure in a so-called wound form. An integrated cylindrical filter is introduced into the tube machine, and the conveyor belt is wrapped around the outer periphery of the filter material for the sheath section via a paper web (paper web), and is fed inside the tube machine while being compressed. Manufactures plugs.

[0004]

However, in such a conventional general manufacturing method, the filter material for the sheath part compresses the filter material for the core part in this winding machine, so that the core part is compressed. Is deformed.
Even if an attempt was made to give a predetermined density or shape to the core portion, it was not as designed, and the filtering performance of tar and the like and the taste could not be controlled as desired. Therefore, as the filter material for the core portion or the filter material for the sheath portion, it is necessary to select and use a material that can withstand such compressive deformation, and the selection of the filter material is restricted.
As a result, the taste was sometimes impaired. The present invention has been made to solve the above-mentioned problem, and relates to a cigarette filter having at least a core portion and a sheath portion, and there are few restrictions on material selection of a filter material. Sheath with high flexibility
An object of the present invention is to provide a method of manufacturing a core type tobacco filter and an apparatus therefor.

[0005]

According to the present invention, there is provided a method of manufacturing a sheath-core type tobacco filter, comprising: supplying a sheath-portion filter material around a core-portion filter material; In a method for manufacturing a sheath-core type tobacco filter comprising a layer, a transfer path for sandwiching and transferring a filter material for a core portion is formed so as to face each other.
The filter material for the core part and the filter material for the sheath part supplied by the pair of belts are integrated. Here, a grooved bell is used as the belt
Theft is desirable. Further, it is desirable to integrate the filter material for the core portion and the filter material for the sheath portion after the outer peripheral portion of the filter material for the core portion is heat-welded. In addition, it is desirable that the core portion filter material is corrugated. Furthermore, it is desirable to attach a binder to the filter material for the core. The filter material for the sheath portion and / or the filter material for the core portion are desirably made of cellulose acetate fiber.

An apparatus for manufacturing a sheath-core type tobacco filter according to the present invention comprises a supply system of a filter material for a core part, a supply system of a filter material for a sheath part, and a filter material for a sheath part around the core part filter material. In a manufacturing apparatus for a sheath-core type tobacco filter having a plurality of layers having a concentrating section for concentrically supplying the filter material and a winding machine for integrating them, a transfer path for holding and transferring the filter material for the core section is formed. A take-up device provided with a pair of grooved belts disposed opposite to each other is provided at a position upstream of the converging portion. Further, it is desirable that a thermoforming concentrator for thermally welding an outer peripheral portion of the core portion filter material is provided at a position upstream of the converging portion. Further, it is desirable that a corrugation thermoforming device for corrugating the filter material for the core portion is provided at a position upstream of the focusing portion. It is desirable that the clearance of the pair of grooved belts of the take-up device be 0.5 mm or more and 7 mm or less.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheath-core type tobacco filter manufactured by the manufacturing method and apparatus according to the present invention comprises, for example, as shown in FIGS. And a sheath portion 2 arranged around the portion 1. still,
In the illustrated example, a wrapping paper 3 for increasing rigidity is arranged around the outer periphery of the sheath portion 2. The present invention is not limited to the two-layer structure of the core part 1 and the sheath part 2,
The present invention can be applied to a sheath-core type tobacco filter having three or more layers. However, in order to simplify the explanation, a two-layered sheath-core type tobacco filter shown in FIGS. explain.

An example of a method of manufacturing a sheath-core type tobacco filter and an apparatus thereof according to the present invention will be described with reference to FIG. In the apparatus 30 for manufacturing a sheath-core type tobacco filter of the illustrated example, the supply system 24 for the filter material for the sheath portion is provided.
A filter material supply system 26 for a core portion;
And a winding machine 32. The sheath-portion filter material supply system 24 includes a predetermined sheath-portion filter material 22.
Is supplied to the converging unit 28, and in the illustrated example,
The sheath portion filter material 22 led out from the filter material storage unit 34 is sent to the focusing unit 28 after passing through the spreader 5. The sheath portion filter material 22 can be applied as long as it is generally used for a tobacco filter.
The sheath portion filter material 22 is uniformly spread by the spreader 5 and pulled out by the delivery roll 6.

The core filter material supply system 26 supplies a predetermined core filter material 21 to the converging section 28. In the illustrated example, the filter material storage section 36 is provided.
The core filter material 21 derived from the fiber opening machine 11
After that, it is sent to the focusing unit 28. The filter material 21 for the core part can be applied as long as it is a material commonly used for a tobacco filter. Filter material for core 21
Is spread uniformly by the spreader 11 and pulled out by the delivery roll 12. Such opening is particularly necessary when the filter material is made of tow. For example, when the filter material is sliver or spun roving, it can be omitted. Filter material storage units 34, 3
6 is also used as a veil as required.

The converging section 28 is formed of the filter material 2 for the sheath section.
2 is arranged around the filter material 21 for the core part, and has a schematic configuration including a ring guide and a double conical tube 15. One or more ring guides may be used,
In the illustrated example, it has two, a ring guide 7 and a ring guide 8. In this case, as shown in FIGS.
The size of the ring guide 8 located on the downstream side (radius r ₂ )
Is smaller than the size (radius r ₁ ) of the ring guide 7 located on the upstream side (r ₂ <r ₁ ). In the ring guides 7 and 8, the sheath portion filter material 22 is sent to the double conical tube 15 through the outer peripheral surface of the ring guides 7 and 8, and is gradually expanded into a cylindrical shape. Further, the core-portion filter material 21 is sent to the double conical tube 15 through the internal through holes of the ring guides 7 and 8.

The double conical tube 15 is as shown in FIG. 2 and is formed by integrating a tapered inner conical tube 38 and an outer conical tube 40. The sheath-portion filter material 22 is fed through the outer passage 41 in the outer conical tube 40 through the inner passage 39 in the tube 38. The core-portion filter material 21 and the sheath-portion filter material 22 that have passed through the double conical tube 15 are fed to a winding machine 32. A well-known thing can be applied to the winding machine 32. In the winding machine 32, while the web 3 is introduced further outside the sheath portion filter material 22,
The sheath portion filter material 22 is conveyed and integrated while being compressed from the outside by the conveying belt 42.

In the present invention, the core filter material supply system 26 is provided with clamping means for securely clamping and transferring the core filter material 21 while maintaining its shape. An example of such a holding means is a take-off device 17 shown in the figure. FIG.
A pair of grooved belts 18 and 19 as shown in FIG. Since the core-portion filter material 21 is sandwiched between the grooved belts 18 and 19, the core-portion filter material 21 is bundled by a drive source (not shown) by providing a clearance A and providing a clearance A therebetween. Self-propelled at a constant speed so as to be fed to the section 28. The grooved belts 18 and 19 are formed so as to form a transfer path 50 having a substantially circular gap in cross section when they are brought into close contact with each other. Semicircular holding grooves 44 and 46 are formed, and the core filter material 21 is transferred while being held in the transfer path 50.

The grooved belts 18 and 19 are preferably made of a material having hardness and dimensional stability capable of forming grooves, and are made of synthetic rubber, particularly nitrile rubber (NB) having a rubber hardness of 60 to 70.
R) is preferable because hardness is appropriate and the core-portion filter material 21 can be clamped without losing its shape. Furthermore,
It is preferable to use a glass fiber as the core wire in order to prevent the belt from extending. The take-off device 17 has a grooved belt 1
8 and the holding groove 46 of the grooved belt 19.
It is preferable to provide an adjustment mechanism that can match the center of the image. The clamping force of the core portion filter material 21 by the grooved belts 18 and 19 depends on the clearance A between the grooved belts 18 and 19, the tension of each grooved belt 18 and 19, and the length of each grooved belt 18 and 19. Can be adjusted. The clamping force of the core portion filter material 21 by the grooved belts 18, 19 is such that the core portion filter material 21 can be sufficiently taken from the previous process and fed to the converging portion 28. Adjust and set the parameters. In particular, when a later-described heat-welding step is in the preceding step, a clamping force higher than the resistance force when passing through the thermoforming converging device is exerted.

The lower grooved belt 18 and the upper grooved belt 19 may be arranged in exactly the same manner. However, as shown in FIG. 1, the lower grooved belt 18 is clamped. Grooved belt 1 whose running length is located above
9 and the grooved belts 18 and 19 are arranged so that the single-side band 48 for clamping the filter material 21 for the core portion only by the grooved belt 18 located below is provided. Filter material 21 can be more stably introduced into take-off device 17. The holding grooves 44, 46 of the grooved belts 18, 19 are such that when the core-portion filter material 21 is sandwiched and transported therebetween, the core-portion filter material 21 has a predetermined core shape. Is what you do.

The values of the transfer path width D and the clearance A are related to the contact area with the core filter material 21 and affect the clamping force. When the clearance A between the pair of grooved belts 18 and 19 is 0.5 mm or more and 7 mm or less, the cross-sectional shape and size of the transfer path 50 formed by the holding grooves 44 and 46 are the predetermined shapes of the core portion. , And more preferably the dimensions. Clearance A is core 1
Must be smaller than the outer diameter of the filter, and the outer diameter of a normal tobacco filter is 8 mm.
The value is desirably 7 mm or less. On the other hand, when the clearance A is less than 0.5 mm, the core part filter material 2
It is not preferable because there is little adjustment to the shape and the holding force of 1 and it becomes impossible to cope with deformation due to abrasion of the grooved belt due to long-term operation. The transfer path width D determines the thickness of the core portion of the tobacco filter, and is appropriately set according to the intended tobacco filter.
７7.5 mm.

In order to manufacture a sheath-core type tobacco filter with this tobacco filter manufacturing apparatus, first, a core filter material supply system 26 and a sheath filter material supply system 24 are driven to drive the core. The part filter material 21 and the sheath part filter material 22 are led out from the respective filter material storage parts 36 and 34. Then, the filter material 21 for the core portion is uniformly spread by the spreader 11, and the filter material 22 for the sheath portion is uniformly spread by the spreader 5. Then, the sheet-shaped filter material 22 for the sheath portion is supplied to the focusing portion 28 as it is, and the filter material 21 for the core portion is fed by the take-off device 17 to the grooved belts 18 and 19.
After being clamped and transported by the, it is supplied to the converging section 28.

At this time, binders (plasticizers) such as triacetin, triethylene glycol diacetate and triethylene glycol dipropionate are applied to the filter materials 21 and 22 by the delivery rolls 6 and 12 of the opening machines 5 and 11, respectively. It is preferable that they are uniformly attached. The method for attaching the binder is not particularly limited as long as it can be attached as uniformly as possible to the surface of the filter material in which the binder has been opened, but the following two methods are mainly used. One is to transfer the binder to the roll surface by bringing the felt impregnated with the binder into contact with the surface of the steel roll, and to attach the spread filter material to the surface of the filter material as it passes through the delivery roll. It is based on the applicator method. The other is a brush applicator system in which binder exuded from a slit in a chamber is splashed off by a rotating brush to form a mist and adhere to the surface of a filter material.

According to these methods, when the binder adheres to and is contained in the filter material, the dissolving action of the binder is caused on the surface of the filter material, and the portions in contact with each other are melted, and the softened surfaces are united and fused to be integrated. Be transformed into In a portion where the filter materials are in contact with each other, a strong and complete fusion state is obtained, and the fusion intersection portion holds the filter material more firmly and the rigidity as a whole is improved. In the present invention, the binder is preferably a liquid binder because of its ease of uniform attachment, and triacetin is particularly preferred from the viewpoint of tobacco taste. The binder is preferably used in an amount of 3 to 15% based on the weight of the fiber. When the amount of the binder attached is less than 3%, the fusion and fusion are insufficient, the integration of the filter material is poor, sufficient hardness is not exhibited, and it is difficult to obtain a corrugated sheet-like material described later. If it exceeds 15%, the effect of the binder cannot be further improved, and the production stability of the corrugated sheet will deteriorate. In addition, the taste of tobacco may be worsened.

In the ring guide of the focusing section 28, as shown in FIGS. 4 and 5, the filter material 22 for the sheath portion passing on the outer peripheral surface gradually increases its angle α and becomes cylindrical (α ₁ < α ₂ ). Such a filter material 2 for a sheath portion
2 covers the periphery of the filter material 21 for the core portion, the filter material 21 for the core portion passes through the inner passage 39 of the double conical tube 15, and the filter material for the sheath portion receives the double conical tube 15.
Is supplied to the outside passage 41. Since the double conical tube 15 is tapered and the diameter of the downstream side is reduced, the double conical tube 15
As shown in FIGS. 6 and 7, the core-portion filter material 21 has a cylindrical shape,
2 is formed in a circular tube shape so as to surround the core portion filter material 21. Then, the filter material having the two-layer structure is fed to the winding machine 32. In the winding machine 32, the web 3 is supplied to the outside of the sheath-portion filter material 22 and is compressed while being conveyed by the conveyance belt 42, so that the core-portion filter material 21 and the sheath-portion filter material 22 are compressed. And the web 3 are integrated, and the long filter plug 52 is manufactured. Then, by appropriately cutting the filter plug 52, FIG.
A sheath-core type tobacco filter shown in FIG. 11 is manufactured.

According to the method and the apparatus for manufacturing a sheath-core type tobacco filter of the present invention, before the sheath-portion filter material 22 is integrated around the core-portion filter material 21, the holding means is provided in advance. Since the filter material 21 for the core portion is formed in a predetermined shape and dimensions, the filter material 22 for the sheath portion is used in the winding machine 32.
, The amount of deformation can be kept small. Therefore, the tobacco filter can be manufactured as designed, and the filtering performance and taste of tar and the like can be controlled. As a result, it is not necessary to deal with the problem by selecting the material of the filter material for the core portion or the sheath portion. For that reason,
It becomes possible to select a filter material with priority on taste. For example, it is possible to use cellulose acetate fiber, particularly cellulose acetate tow, which is excellent in terms of taste, without any trouble, and a more delicious cigarette is realized. In particular, by using a long fiber crimped tow made of cellulose atesate fiber as the filter material for the sheath portion, a tobacco filter having high tobacco smoke filtration efficiency and good flavor can be obtained. Furthermore, according to the present invention, in addition to such quality improvement,
The beauty can also be improved.

Further, as shown in FIG. 1, the thermoforming converging device 16 for thermally welding the outer peripheral portion of the core portion filter material 21 is provided at a position upstream of the converging portion 28. desirable. The thermoforming concentrator 16 may be any device that can solidify the surface of the core filter material 21 at a predetermined temperature by contacting the core filter material 21 having a binder attached to the surface. The filter material 21 for the core part is passed through the material 21.
Is preferably formed into a cylindrical shape. By the heat welding processing by the thermoforming converging device 16, the core portion filter material 2 is formed.
The shape of 1 is more stable. In addition, such a thermoforming converging device 16 does not hinder the manufacture of the tobacco filter.

The temperature of the thermoforming converger 16 is preferably in the range of about 60 to 300 ° C., though it depends on the type of the core filter material. If the temperature is lower than 60 ° C., it is difficult to integrally mold the surface of the core filter material, and
If the temperature exceeds 00 ° C., the melting of the filter material for the core part proceeds too much, and it is difficult to form a uniform molded product. The exit cross-sectional area when the core filter material passes through the thermoforming converging device 16 is optimal for determining the convergent shape of the core filter material, depending on the properties of the core filter material. The exit cross-section must be selected. In other words, by reducing the outlet cross-sectional area, the resistance when passing through the thermoforming converging device 16 increases, so that the resistance in the thermoforming converging device 16 and the clamping by the take-off device 17 in the subsequent process. It is necessary to adjust the pulling force for smoothly supplying into the winding machine 32 by the force.

Further, as shown in FIG. 8, it is desirable to provide a corrugation thermoforming device 13 for corrugating the filter material 21 for the core in the supply system 26 for the filter material for the core. The corrugated thermoformer 13 has two upper and lower nip rolls having a large number of grooves, the grooves of the upper and lower nip rolls mesh with each other, and have a function of adjusting the clearance to a thickness of about 1 mm or less, Various devices can be used as long as they have the ability to pressurize at a predetermined pressure and the ability to perform thermoforming at a predetermined temperature. The sheet-like core portion filter material 21 that has been corrugated by the corrugating thermoforming device 13 is pulled out by the extra roll 14. Further, by disposing the above-mentioned thermoforming converging device 16 at a position downstream of the corrugating thermoforming device 13, the corrugated shape is further stabilized.

In a tobacco filter in which the core portion filter material 21 is corrugated, the corrugated shape, that is, the groove pitch p and the groove depth d shown in FIG. 9 affects the characteristics of the tobacco filter. The corrugated sheet preferably has a sheet width of 90 to 240 mm, a pitch p between grooves of 0.5 to 3 mm, and a groove depth d of 0.2 to 2 mm. If the pitch p between the grooves of the corrugated sheet is less than 0.5 mm, or the groove depth d is less than 0.2 mm, the difficulty in producing the corrugated sheet is sharply increased. On the other hand, the groove pitch p is larger than 3 mm,
Alternatively, when the groove depth d is more than 2 mm and is deep, it is difficult to form a corrugated sheet having good convergence. The corrugated shape is adjusted by the amount of the binder, the fiber type, the fiber thickness, the clearance between the nip rolls of the corrugated thermoformer 13, the pressure, the temperature, and the like.

The clearance between the nip rolls is 0.5 m
m or less, the pressure between nip rolls is 0.5 to 6 kg / cm ² G
And the temperature are preferably in the range of 60 to 180 ° C. If the clearance between the nip rolls of the corrugated thermoformer 13 exceeds 0.5 mm, and if the temperature is lower than 60 ° C., it is difficult to form a corrugated sheet-shaped material. If the temperature exceeds 180 ° C., on the other hand, the sheeting proceeds too much,
It is difficult to obtain a filter material having sufficient suction resistance, and the production stability of the corrugated sheet is deteriorated. As a result, the performance of the filter material is reduced, which is not preferable.

The surface of the corrugated sheet-like material is formed by welding and the core filter material 21 having improved shape stability is used. Even if the filling amount of is increased, the shape of the core portion is not easily deformed, so that a tobacco filter having desired filtering characteristics, smoke amount feeling and flavor can be obtained. Also, in the case of a cigarette filter using the corrugated sheet-like material, the corrugated sheet-like material and the smoke flow are formed even though the core has a flow passage formed therein in which the smoke of the tobacco is circulated satisfactorily. It also has a filtering effect due to collision with objects, and while smoking, there is little tobacco smoke that passes through the inside of the corrugated sheet and reaches the mouth, but it has a sufficient smoke volume and flavor Obtainable. When a corrugated sheet made of a fibrous material is used as the sheet, when the sheet weight is increased, the efficiency of removing particulate components in tobacco smoke is increased by increasing the basis weight. Can be. In the case where the core-portion filter material 21 is formed into a corrugated sheet-like material, it is particularly preferable to use an acetate long-fiber tow because the flavor of the tobacco can be drastically improved.

[0027]

Next, the present invention will be described specifically with reference to examples. Example 1 The cigarette filter shown in FIG. 1 was prepared by using 8 dpf 11,000 total denier cellulose acetate in the Y section as a filter material for the core portion and using 1.5 dpf 44000 total denier cellulose acetate tow in the Y section as a filter material for the sheath portion. The manufacturing apparatus 30 manufactured a sheath-core type tobacco filter. The core filter material 21 is formed by attaching 8% triacetin to the tow weight by the delivery roll 12 and then passing through a thermoforming converging unit 16 having an inner diameter of 3 mmφ at the outlet to form a cylindrical shape having a diameter of 3 mm. Was sent to the take-off device 17. The take-off device 17 used had a transfer path width D of 3 mm and a belt-to-belt clearance A of 1 mm. This take-up device 1
7, the core filter material 21 is supplied to the center of the double conical tube 15 while being sandwiched.
2 concentric circles, length 120mm, circumference 2
A 4.6 mm filter plug 52 was manufactured and cut to obtain a sheath-core type tobacco filter. The obtained sheath-core type tobacco filter was uniform and of high quality as designed, without collapse of the core shape and without appearance of wrinkles.

Example 2 A cellulose acetate tow having a total density of 8 dpf 29000 denier in the Y section was used as the filter material 21 for the core, and a cellulose acetate tow having a total density of 1.5 dpf 44000 in the Y section was used as the filter material 22 for the sheath. A sheath core type tobacco filter was manufactured by the tobacco filter manufacturing apparatus 30 shown in FIG. The core filter material 21 was formed by attaching 6% of triacetin to the tow weight with the delivery roll 12 and then passing through a thermoforming converging device 16 having an inner diameter of 4 mmφ at the outlet to form a cylindrical shape having a diameter of 4 mm. Was sent to the take-off device 17. The take-off device 17 used had a transfer path width D of 4 mm and a belt-to-belt clearance A of 1 mm. The take-up device 17 supplies the filter material 21 for the core to the central portion of the double conical tube 15 while holding the filter material 21 therebetween.
A filter plug 52 having a concentric plug length of 120 mm and a circumference of 24.6 mm was manufactured by being wrapped with the sheath portion filter material 22, and cut to obtain a sheath-core type tobacco filter. The obtained sheath-core type tobacco filter does not collapse the shape of the core,
The appearance was uniform and high quality as designed without wrinkles or the like.

[Embodiment 3] 7.3dpf36000 in Y section
Using the total denier cellulose acetate as the filter material 21 for the core part and the cellulose acetate tow of 1.5 dpf30000 total denier in the Y section as the filter material 22 for the sheath part, the sheath filter was used in the tobacco filter manufacturing apparatus 30 shown in FIG.・ The core type tobacco filter was manufactured. The filter material 21 for the core portion was prepared by attaching triacetin at 11% to the weight of the tow with the delivery roll 12 and then passing through a thermoforming converging device 16 having an inner diameter of 5 mmφ at the outlet to form a cylindrical shape having a diameter of 5 mm. Was sent to the take-off device 17. The take-off device 17 used had a transfer path width D of 5 mm and a belt clearance A of 1 mm. In this take-off device 17, the core portion filter material 2
1 was supplied to the center of the double conical tube while being clamped, and wrapped with the filter material 22 for the sheath portion to produce a filter plug 52 having a concentric plug length of 120 mm and a circumference of 24.6 mm. Then, this was cut to produce a sheath-core type tobacco filter. The obtained sheath-core type tobacco filter was uniform and of high quality as designed, without collapse of the core shape and without appearance of wrinkles.

[Embodiment 4] 1.9 dpf 15000 in Y section
Total denier cellulose acetate was used as the filter material 21 for the core portion, and 1.5 dpf44000 total denier cellulose acetate tow was used as the filter material 22 for the sheath portion in the Y section. The tobacco filter manufacturing apparatus 31 shown in FIG. A core type tobacco filter was manufactured. 13% triacetin based on the tow weight is attached to the filter material 21 for the core by the delivery roll 12 and then formed into a corrugated sheet by the corrugating thermoforming device 13. After passing through a forming converging device 16, a product formed into a cylindrical shape having a diameter of 3 mm was fed to a take-off device 17. The take-off device 17 has a transfer path width D of 3 mm and a clearance A between belts of 0.5.
The filter material 21 for the core portion is supplied to the central portion of the double-cone tube 15 while being sandwiched by the take-off device 17 and wrapped with the filter material 22 for the sheath portion to form a concentric plug. Length 120mm, circumference 24.6m
m filter plug 53 was manufactured. Then, this was cut to produce a sheath-core type tobacco filter.
The obtained sheath-core type tobacco filter was uniform and of high quality as designed, without collapse of the core shape and without appearance of wrinkles.

[Embodiment 5] 1.5 dpf 30000 in Y section
Total denier cellulose acetate was used as the filter material 21 for the core portion, and 1.5 dpf44000 total denier cellulose acetate tow was used as the filter material 22 for the sheath portion in the Y section. The tobacco filter manufacturing apparatus 31 shown in FIG. A core type tobacco filter was manufactured. 8% triacetin based on the weight of the tow is attached to the filter material 21 for the core by the delivery roll 12 and then formed into a corrugated sheet by the corrugator thermoforming device 13. The product was formed into a column having a diameter of 4 mm through a forming converging device 16 and fed to a take-off device 17. The take-off device 17 has a transfer path width D of 4 mm and a belt-to-belt clearance A of 0.
5 mm is used. The filter material 21 for the core is sandwiched by the take-off device 17 and supplied to the center of the double-cone tube while being wrapped with the filter material 22 for the sheath. The concentric plug length is 120 mm. A filter plug 53 having a circumference of 24.6 mm was manufactured. Then, this was cut to produce a sheath-core type tobacco filter. The obtained sheath-core type tobacco filter was uniform and of high quality as designed, without collapse of the core shape and without appearance of wrinkles.

[Embodiment 6] 1.5 dpf44000 in Y section
Total denier cellulose acetate is used as the filter material 21 for the core part, and 3.3 dpf39000 total denier cellulose acetate tow is used as the filter material 22 for the sheath part in the Y section. A core type tobacco filter was manufactured. After the triacetin of 5% of the tow weight is adhered to the filter material 21 for the core by the delivery roll 12 and formed into a corrugated sheet by the corrugation thermoforming device 13, the inner diameter of the outlet is 5 mmφ. After passing through a forming converging device 16, the product formed into a column having a diameter of 5 mm was fed to a take-off device 17. The take-off device 17 has a transfer path width D of 5 mm and a clearance A between belts of 0.5 m.
The filter material 21 for the core is sandwiched by the take-off device 17 and supplied to the center of the double conical tube while being wrapped by the filter material 22 for the sheath. A filter plug 53 having a diameter of 120 mm and a circumference of 24.6 mm was manufactured. Then, this was cut to produce a sheath-core type tobacco filter. The obtained sheath-core type tobacco filter was uniform and of high quality as designed, without collapse of the core shape and without appearance of wrinkles.

[0033]

According to the present invention, in a tobacco filter having a core portion and a sheath portion, the core portion shape can be formed as desired, so that the filtering performance and taste of tar and the like can be controlled and the quality can be improved. Can be. In addition, the degree of freedom in design can be improved and the taste can be improved from the viewpoint that restrictions on material selection of the filter material are reduced. Further, the aesthetic feeling can be improved. Therefore, it is possible to use cellulose acetate fiber excellent in terms of taste, particularly cellulose acetate tow without any trouble,
A more delicious cigarette is realized. In particular, by using a long fiber crimped tow made of cellulose atesate fiber as the filter material for the sheath portion, a tobacco filter having high tobacco smoke filtration efficiency and good flavor can be obtained. Further, if a pair of grooved belts arranged opposite to each other while forming a transfer path are used as the holding means, the core filter material can be reliably held and transferred while maintaining its shape. .

Further, by providing a thermoforming converging device and performing heat welding on the outer peripheral portion of the core portion filter material,
The shape of the core filter material can be further stabilized. Furthermore, by providing a corrugated thermoforming device for corrugating the filter material for the core, it is possible to achieve both a reduction in tobacco smoke reaching the mouth and a sufficient smoke volume or flavor. Furthermore, by attaching an appropriate amount of binder, the shape stability of the filter can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a method for producing a sheath-core type tobacco filter of the present invention.

FIG. 2 is a perspective view of a double conical tube.

FIG. 3 is a cross-sectional view showing an example of a grooved belt.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 1;

FIG. 8 is a schematic configuration diagram showing an example of a method for producing a sheath-core type tobacco filter of the present invention.

FIG. 9 is a cross-sectional view of a corrugated core filter material.

FIG. 10 is a cross-sectional view of an example of a sheath-core type tobacco filter.

FIG. 11 is a longitudinal sectional view of an example of a sheath-core type tobacco filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core part 2 Sheath part 3 Web paper 5 Opening machine 6 Delivery berry 7 Ring guide 8 Ring guide 11 Opening machine 12 Delivery roll 13 Corrugated thermoforming machine 14 Extra roll 15 Double conical tube 16 Thermoforming converging device 17 Pulling device Reference Signs List 18 grooved belt 19 grooved belt 21 filter material for core part 22 filter material for sheath part 24 supply system of filter material for sheath part 26 supply system of filter material for core part 28 convergence part 30 tobacco filter manufacturing device 31 tobacco filter Manufacturing apparatus 32 Winding machine 42 Conveyor belt 44 Holding groove 46 Holding groove 50 Transfer path 52 Filter plug 53 Filter plug

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Michihiro Inagaki 1-17-7 Yokokawa, Sumida-ku, Tokyo Japan Tobacco Inc. (72) Inventor Eiichi Takase 3 Kaigan-dori, Toyama City, Toyama Prefecture Mitsubishi Rayon Inside (72) Inventor Masao Okazaki 3 in Kaigan-dori, Toyama City, Toyama Prefecture Inside Mitsubishi Rayon Co., Ltd. (72) Inventor Hiroyuki Fukumura 3 in Kaigan-dori, Toyama City, Toyama Prefecture Inside Mitsubishi Rayon Co., Ltd. (56) References JP-A-7-111885 (JP, A) JP-A-7-75540 (JP, A) JP-A-4-352628 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A24D 3/00-3/16

Claims (11)

(57) [Claims] 1. A method of manufacturing a sheath-core type tobacco filter comprising a plurality of layers by supplying a sheath-portion filter material around a core-portion filter material and concentrically integrating them. Forming a transfer path to hold and transfer the filter material
A method for manufacturing a sheath-core type tobacco filter, comprising: integrating a filter material for a core portion and a filter material for a sheath portion supplied by a pair of belts arranged opposite to each other . 2. The method according to claim 1, wherein the belt is a grooved belt. 3. The sheath and the sheath according to claim 1, wherein after the outer peripheral portion of the core portion filter material is heat-welded, the core portion filter material and the sheath portion filter material are integrated. Manufacturing method of core type tobacco filter. 4. The method for producing a sheath-core type tobacco filter according to claim 1, wherein the filter material for the core portion is corrugated. 5. The method for producing a sheath-core type tobacco filter according to claim 3, wherein a binder is adhered to the core portion filter material. 6. A supply system for a filter material for a core portion, a supply system for a filter material for a sheath portion, a focusing portion for concentrically supplying the filter material for a sheath portion around the filter material for a core portion, In a manufacturing apparatus for a sheath-core type tobacco filter comprising a plurality of layers having a winding machine to be integrated, a pair of grooved belts arranged opposite to each other are formed by forming a transfer path for holding and transferring a filter material for a core. An apparatus for manufacturing a sheath-core type tobacco filter, wherein the take-up device provided is provided at a position upstream of the focusing portion. 7. The sheath-core mold according to claim 6, wherein a thermoforming converging device for thermally welding an outer peripheral portion of the core portion filter material is provided at a position upstream of the converging portion. Equipment for manufacturing tobacco filters. 8. The sheath-core type tobacco filter according to claim 6, wherein a corrugated thermoforming device for corrugating the filter material for the core portion is provided at a position upstream of the focusing portion. Manufacturing equipment. 9. The sheath-core type cigarette according to claim 6, wherein the clearance between the pair of grooved belts of the take-up device is not less than 0.5 mm and not more than 7 mm. Filter manufacturing equipment. 10. The filter material for a sheath part is made of cellulose acetate fiber.
5. The method for producing a sheath-core type tobacco filter according to any one of the above items 5. 11. The filter material for a core part is made of cellulose acetate fiber.
The method for producing a sheath-core type tobacco filter according to any one of the above.