WO2012029117A1

WO2012029117A1 - Manufacturing machine of cigarette filter and manufacturing method of same

Info

Publication number: WO2012029117A1
Application number: PCT/JP2010/064763
Authority: WO
Inventors: 加藤勝男; 中村智史
Original assignee: 日本たばこ産業株式会社
Priority date: 2010-08-31
Filing date: 2010-08-31
Publication date: 2012-03-08

Abstract

A manufacturing machine (20) of a cigarette filter is provided with a pair of heating rolls (62_U, 62_L) which are disposed with an acetate tow serving as a corrugated sheath provided therebetween and has corrugating molds (62a, 62b) that molds a large number of longitudinal grooves on the acetate tow by heating and roll shafts (81, 80) that are protruded from both end surfaces thereof, respectively, bearing support arms (74) and bearing support tables (73) that rotatably support the pair of heating rolls (62_U, 62_L) at both end portions of the roll shafts (81, 80), respectively, and a pair of air cylinders (75a) that applies a uniform molding pressure along a width of a molded gap to the acetate tow which passes between the corrugating molds (62a, 62b) by pressing the heating roll (62_U) toward the heating roll (62_L) through the bearing support arms (74) on the both sides of one heating roll (62_U).

Description

Cigarette filter manufacturing machine and manufacturing method thereof

The present invention relates to a cigarette filter manufacturing machine and a manufacturing method thereof, and more particularly to a manufacturing machine and a manufacturing method capable of improving the productivity while maintaining the quality of the cigarette filter.

Conventionally, a corrugated filter is known as a cigarette filter (Patent Documents 1 and 2). This type of corrugated filter includes a filter material and a corrugated sheath enclosing the filter material, the corrugated sheath having a plurality of longitudinal grooves. These longitudinal grooves extend in the axial direction of the filter material and are arranged at intervals in the circumferential direction of the filter material.

A manufacturing machine for manufacturing such a corrugated filter includes a pair of heating rolls, and these heating rolls are disposed so as to sandwich the transfer path between the transfer paths of acetate tow as a filter material. Specifically, the pair of heating rolls has a plurality of formed teeth that mesh with each other on the outer peripheral surface thereof. These forming teeth extend over the entire circumference of the heating roll and are arranged at intervals in the axial direction of the heating roll, and the forming teeth of the pair of heating rolls cooperate with each other to form a corrugated forming gap. Therefore, when the acetate tow passes through the forming gap between the pair of heating rolls, the acetate tow receives the forming pressure from the pair of heating rolls, so that the corrugated tape having a plurality of vertical grooves corresponding to the forming gap, that is, The corrugated sheath described above is formed.

Japanese Patent Publication No. 60-48156 Japanese Examined Patent Publication No. 63-62186

In order to increase the productivity of the corrugated tape described above, that is, to increase the running speed of acetate tow, it is necessary to increase the temperature of the acetate tow and increase the molding pressure. However, if the heating roll is heated to a high temperature in order to increase the temperature of the acetate tow, the acetate tow is welded to the heating roll, making it impossible to form a high-quality corrugated sheath.
On the other hand, the corrugated filter manufacturing machine described above uses an induction heating device for heating the heating roll, and this induction heating device is inserted into each heating roll from the side thereof to heat the heating roll from the inside. To do.

Specifically, the heating roll has a roll shaft that is rotatably supported by the bearing base, the induction heating device is supported by the roll shaft between the heating roll and the bearing base, and the above-described forming pressure is It is added to one heating roll via a bearing stand and a roll shaft.
Therefore, the working point of the forming pressure applied to the roll shaft and the support point of the heating roll on the roll shaft are shifted from each other in the axial direction of the roll shaft. It causes bending. Such bending of the roll shaft makes it impossible to maintain the above-described forming gap with high accuracy, so that the vertical grooves cannot be formed accurately in the acetate tow, and the quality of the corrugated sheath is deteriorated. As a result, it is difficult to improve the production speed of the cigarette filter, that is, the productivity, while maintaining the quality of the corrugated sheath, that is, the cigarette filter.

An object of the present invention is to provide a cigarette filter manufacturing machine and a method for manufacturing the cigarette filter that improve the productivity while maintaining the quality of the cigarette filter when manufacturing the cigarette filter.

In order to achieve the above object, a cigarette filter manufacturing machine according to the present invention is disposed in a first transfer path for transferring a first tow material as a cigarette filter material toward the end, and a first transfer path, A molding device for passing the first tow material, and when the first tow material passes, the first tow material is converged to form a filter core, and a second tool toward the end of the first transfer path. The tow material is transferred, and in this transfer process, a second transfer path for forming a tape-shaped packaging material from the second tow material, and a terminal end of the first transfer path, the filter core from the molding machine, the second transfer A wrapping for receiving a packaging material and a paper web from the path, forming a corrugated rod in which the filter core is wrapped in the packaging material, and forming a filter rod in which the corrugated rod is wrapped in the paper web. And a thermoforming section that is disposed in the second transfer path and thermoforms the packaging material to the corrugated tape toward the wrapping section to make the filter rod a corrugated rod, the thermoforming section comprising the second transfer path. A pair of heating rolls having a roll shaft that is disposed between both ends and projecting from both end faces, and ring-shaped corrugating molds provided on the outer peripheral surface of each heating roll, and these corrugating molds cooperate with each other A molding die that allows passage of the packaging material and defines a molding gap for thermoforming a large number of longitudinal grooves in the packaging material, and a corrugated molding die incorporated in the heating roll. A heating source for heating, a bearing device that rotatably supports a pair of heating rolls at both ends of the roll shaft, and one heating roll And pressed against the square heating roll, characterized in that it comprises a pressing device for applying a uniform molding pressure along the width of the forming gap packaging material through the forming gap.

Specifically, the pressing device includes a pair of air cylinders, and these air cylinders can press one heating roll via bearing devices on both sides of the one heating roll.
According to the cigarette filter manufacturing machine of the present invention, each of the pair of heating rolls is supported at both ends by a bearing device at both ends of the roll shaft, while the pressing device, that is, the pair of air cylinders, A uniform forming pressure is applied to the packaging material passing through the forming gap along the width of the forming gap by pressing the one heating roll toward the other heating roll via the bearing devices on both sides of the one heating roll. . Therefore, even if the molding pressure for the packaging material is increased, the axis of the heating roll does not bend, and the molding gap between the molding dies is maintained with high accuracy. As a result, the manufacturing machine can increase the production speed of the corrugated tape, that is, improve the productivity while maintaining the quality of the corrugated tape.

Further, it is desirable that the mold is positioned at the center between the bearing devices. In this case, the heating roll mold is positioned in the same vertical plane passing through the center between the bearing devices. Therefore, even if the molding pressure for the second tow material is increased, the axis of the heating roll does not bend, and the molding gap between the molding dies is maintained with high accuracy.
Moreover, it is a pair of rest apparatus which is mutually spaced apart along the axial direction of a heating roller, and is located on both sides of a shaping | molding die, Comprising: The rest apparatus which rolls and supports each heating roll can be further provided. In this case, since the rest device increases the support point of the corresponding heating roll, the load applied to the roll shaft is reduced and the bending of the roll shaft is surely prevented. As a result, the roll axis parallelism in the heating roll is maintained with high accuracy.

The heating source can include an induction coil for heating the outer peripheral wall of the heating roll and a heat pipe structure using the outer peripheral wall. In this case, since the outer peripheral portion of the heating roll has a heat pipe structure, the outer peripheral wall of the heating roll generates heat uniformly. As a result, the mold receives heat from the outer peripheral wall of the heating roll and is quickly heated.
The manufacturing machine may further include a preheating device that preheats the second tow material upstream of the thermoforming section.

Further, the manufacturing machine further includes a coating unit that is disposed upstream of the thermoforming section and applies a plasticizer to the second tow material, and the preheating device includes a plasticizer to be applied to the second tow material. A preheater heater can be included. In this case, since the plasticizer applied to the second tow material is preliminarily heated by the preheating device, the heating roll, that is, in a state where the heating temperature of the mold is suppressed, that is, the mold The second tow material can be heated at a high temperature in a state in which the second tow material is prevented from welding.

On the other hand, the manufacturing method of a cigarette filter includes a pre-process in which the first tow material is converged and formed into a filter core in the transfer process of the first tow material as a cigarette filter material, and the filter core is formed from the second tow material. A post-process for forming a filter rod by further wrapping the filter element with a paper web while forming the filter element by wrapping with a wrapping material, and a filter rod formed in the post-process prior to forming the filter element in the post-process A thermoforming process in which the packaging material is thermoformed into a corrugated tape having a number of longitudinal grooves to form a corrugated rod, the thermoforming process being defined between the molds of a pair of heating rolls. When passing through the forming gap, pressure is applied to the wrapping material, and the wrapping material is thermoformed into a corrugated tape, where a pair of heating rolls One heating roll is pressed toward the other heating roll in a state of being rotatably supported at both ends of the roll shaft, and a uniform molding pressure along the width of the molding gap is applied to the packaging material. It is characterized by that.

According to the cigarette filter manufacturing machine and the manufacturing method thereof of the present invention, the corrugated roll can be rotated at a high speed and the quality of the cigarette filter can be improved.

It is a perspective view which shows the filter cigarette provided with the corrugated filter manufactured with the manufacturing machine of the cigarette filter which concerns on this invention. It is sectional drawing of a corrugated filter. It is a perspective view which shows the filter element obtained by wrapping a filter core with a corrugated sheath. It is a perspective view when a filter core is wrapped in a corrugated sheath. It is the schematic which shows the manufacturing machine of the cigarette filter which concerns on this invention. It is the schematic which shows the upper surface of a corrugated sheath. It is the schematic which shows the lower surface of a corrugated sheath. It is the schematic which shows the corrugating apparatus provided with a pair of heating roll. It is sectional drawing which shows the heating roll provided with the heating apparatus.

Referring to FIG. 1, a filter cigarette 1 is shown, and the filter cigarette 1 includes a corrugated cigarette filter. Specifically, the filter cigarette 1 includes a cigarette 2 and a rod-shaped filter unit, and the cigarette 2 and the filter unit are connected to each other by a chip paper 8.
On the other hand, the filter unit is a so-called dual filter including a plain filter (not shown) and a corrugated filter 10, and these filters are connected to each other in tandem by a molding paper 18. The plain filter has a filter material made of acetate fiber and a web that wraps the filter material.

Details of the corrugated filter 10 are shown in FIGS. The corrugated filter 10 has a triple structure of a filter core 12, a corrugated sheath 14 and a web 16. Specifically, the filter core 12 is wrapped by a corrugated sheath 14. Both the filter core 12 and the corrugated sheath 14 are formed of a filter material made of acetate fibers, and form a rod-shaped filter element. The corrugated sheath 14 has a large number of vertical grooves on its outer peripheral surface, and these vertical grooves extend parallel to each other along the longitudinal axis of the corrugated filter 10. It is desirable that the acetate fiber forming the corrugated sheath 14 has a smaller diameter than that of the filter core 12. Furthermore, the filter element described above is wrapped by a web 16 from the outside, and this web 16 and the longitudinal grooves cooperate with each other to form a number of axial passages in the corrugated filter 10.

The corrugated filter 10 described above is manufactured by the manufacturing machine 20 shown in FIG. 5, and a manufacturing method of the manufacturing machine 20 and the corrugated filter 10 will be described below.
The manufacturing machine 20 includes a first transfer path 30 of acetate tow 32 for forming the filter core 12 and a second transfer path 40 of acetate tow 42 for forming the corrugated sheath 14. These first and

second transfer paths

30 and 40 extend from the tow supply source, that is, the

tow bales

22 and 23 in which the

acetate tow

32 and 42 are stored in a folded state, toward the wrapping section 88. Therefore, the acetate tows 32, 42 are sequentially fed from the

tow bales

22, 23 toward the wrapping section 88 along the first and

second transfer paths

30, 40.

In the first transfer path 30, an opening section 26 and a plasticizer coating section 50 are sequentially arranged from the upstream side. The spread section 26 includes a pair of pre-tension rolls 36 and a pair of blooming rolls 38 that are disposed with the acetate tow 32 on the first transfer path 30 interposed therebetween. The blooming roll 38 is located downstream of the pre-tension roll 36. Has been placed.

The pair of pre-tension rolls 36 can change the rotation speed, and give a desired tension to the acetate tow 32 in cooperation with the guide roll 24 arranged on the upstream side. On the other hand, the pair of blooming rolls 38 has a large number of circumferential grooves on the outer peripheral surface thereof, and these circumferential grooves stretch the fibers of acetate tow 32 that passes on the blooming roll 38.

Furthermore, the opening section 26 includes two banding

jets

34 a and 34 b in the first transfer path 30. The banding jet 34a is disposed in the first transfer path 30 between the tow veil 22 and the guide roller 24, and the banding jet 34b is disposed in the first transfer path 30 between the pretension roll 36 and the plasticizer coating section 50. ing. When the acetate tow 32 fed out from the tow bale 22 passes through the banding

jets

34 a and 34 b, the banding

jets

34 a and 34 b spray compressed air on the surface of the acetate tow 32 to open the acetate tow 32.

On the other hand, the plasticizer coating section 50 includes a pair of coating rolls 52 arranged one above the other. These coating rolls 52 bend the first transfer path 30 in a substantially S shape, That is, the acetate tow 32 is sandwiched from above and below. Also, one of the coating rolls 52 can vary its rotational speed. Therefore, the acetate tow 32 traveling on the first transfer path 30 passes through the coating rolls 52 while being sequentially wound around the pair of coating rolls 52. The acetate tow 32 here is sent out according to the rotation speed of the coating roll 52 as described above.

Further, the plasticizer coating section 50 includes felts 53 that come into contact with the outer peripheral surfaces of the respective coating rolls 52, specifically, the outer peripheral surfaces other than the area where the acetate tow 32 is wound, and these felts 53 have a high liquid absorbency. Have The felt 53 is connected to a tank device 54 through a supply pipe 55, and the tank device 54 stores a liquid plasticizer therein. In addition, as a plasticizer here, a triacetin is suitable, for example.

The tank device 54 supplies a plasticizer to each felt 53 through the supply pipe 55, and each felt 53 is in contact with the outer peripheral surface of the corresponding coating roll 52 in a state in which the plasticizer supplied from the tank device 54 is impregnated. In contact.
Therefore, since each felt 53 supplies a plasticizer to the outer peripheral surface of the corresponding coating roll 52, when the acetate tow 32 passes over the pair of coating rolls 52, these coating rolls 52 are connected to the acetate tow 32. Apply plasticizer on both sides. Thereafter, the acetate tow 32 coated with the plasticizer is directed to a trumpet guide 86 as a molding machine.

The trumpet guide 86 receives the acetate tow 32 from the first transfer path 30. Specifically, the trumpet guide 86 converges the received acetate tow 32 to form the filter core 12, and the filter core 12 is supplied toward the wrapping section 88.
On the other hand, the second transfer path 40 also includes a fiber opening section 27, a plasticizer coating section 51, and a thermoforming section 60. Here, since the opening section 27 is the same as the opening section 26 of the first transfer path 30, the description thereof is omitted.

On the other hand, the plasticizer coating section 51 is the same as the plasticizer coating section 50 described above except that the tank device 54 includes a heater 56. Specifically, the heater 56 is disposed adjacent to the plasticizer tank of the tank device 54 and can heat the plasticizer in the plasticizer tank to a desired temperature. Therefore, the plasticizer coating section 51 applies the plasticizer heated via the coating roll 52 to both surfaces of the acetate tow 42.

The thermoforming section 60 is disposed on the downstream side of the plasticizer coating unit 51 and includes a pair of heating rolls 62 _U and 62 _L. These heating rolls 62 _U and 62 _L are arranged with the acetate tow 42 on the second transfer path 40 interposed therebetween. Each heating roll 62 has a large number of molding teeth (not shown) that mesh with each other on the outer peripheral surface thereof. These molding teeth extend over the entire circumference of the heating roll 62 and are spaced apart in the axial direction of the heating roll 62. Has been placed.

The forming teeth of the pair of heating rolls 62 _U and 62 _L cooperate with each other to form a corrugated forming gap, and when the acetate tow 42 passes through the forming gap, the forming gap forms a number of longitudinal grooves in the acetate tow 42. As a result, the acetate tow 42 is formed into a continuous corrugated tape 14t as shown in FIGS. Thereafter, the corrugated tape 14t goes to the wrapping section 88.
Further, as shown in FIG. 7, the corrugated tape 14 t can have blocking portions 44 randomly distributed on the lower surface thereof, and these blocking portions 44 partially block the longitudinal grooves. It performs the same function.

The wrapping section 88 is supplied with a paper web, that is, a web 16, along with the filter core 12 and the corrugated tape 14t via a plurality of guide rollers 82. Specifically, the corrugated tape 14t is supplied to the wrapping section 88 from the lower side of the filter core 12, while the web 16 is supplied to the wrapping section 88 from the lower side of the corrugated tape 14t. Therefore, when the filter core 12, the corrugated tape 14t, and the web 16 pass through the wrapping section 88, the wrapping section 88 is formed into a corrugated rod (not shown) that continuously wraps the filter core 12 with the corrugated tape 14t. At the same time, the corrugated rod is formed into a filter continuous body (not shown) continuously wrapped by the web 16. After this, the filter continuum is cut into individual filter rods 90 within the wrapping section 88, which filter rods 90 are delivered from the wrapping section 88. The filter rod 90 has a length corresponding to several corrugated filters 10 and is used for manufacturing the filter cigarette described above.

FIG. 8 shows more specifically the corrugating apparatus 70 including the pair of heating rolls 62 described above, and the corrugating apparatus 70 will be described in detail below.
The corrugating apparatus 70 includes a support frame 69 surrounding the pair of heating rolls 62 _U and 62 _L. The support frame 69 includes a base 71. Left and right side walls 72 extend upward from the base 71, and these side walls 72 are connected to each other by a top plate 77. Therefore, the support frame 69 has opening surfaces that open toward the upstream side and the downstream side, respectively, and these opening surfaces are each closed by a cover (not shown). Slits (not shown) are respectively formed on the surfaces of these covers, and these slits extend horizontally in the width direction of the acetate tow 42 and the corrugated tape 14t, respectively, and are slightly larger than the widths of the acetate tow 42 and the corrugated tape 14t. have. Furthermore, each of these slits is positioned at a position corresponding to the transfer path of the acetate tow 42 and the corrugated tape 14t when the cover closes the opening surface. Therefore, these covers prevent dust and the like from entering the support frame 69, but do not hinder the travel of the acetate tow 42 and the corrugated tape 14t.

A pair of bearing support bases 73 are disposed in the support frame 69, and these bearing support bases 73 extend from the base 71 toward the top plate 77 and are spaced apart from each other at a predetermined interval in the width direction of the support frame 69. is doing.
On the other hand, a pair of bearing support arms 74 are suspended from the top plate 77 toward the corresponding bearing support base 73, and these bearing support arms 74 are supported to be movable up and down. Specifically, each bearing support arm 74 passes through the top plate 77 and is connected to a piston rod (not shown) of the air cylinder 75a at the upper end thereof. The pair of air cylinders 75 a are supported by the top plate 77 and are connected to each other via a connecting member 75.

The pair of air cylinders 75a can extend or contract the piston rod in conjunction with each other, whereby the pair of bearing support arms 74 are moved up and down simultaneously. That is, the pair of bearing support arms 74 can be moved toward and away from the corresponding bearing support base 73 in conjunction with each other.
Heating roll 62 _L of the lower side is disposed between the pair of bearing support base 73, and is rotatably supported by these bearings support base 73. In other words, the roll shaft 80 of the heating roll 62 _L protrudes from each of both end surfaces of the heating roll 62 _L, is supported through a bearing on the upper end portions of the pair of bearings supporting table 73.

On the other hand, heating roll 62 _U of upper is disposed between the pair of bearing support arms 74, the roll axis 81 of the heating roll 62 _U is rotatably supported via a bearing on the lower end of the bearing support arms 74.
The

roll shafts

80 and 81 of the heating rolls 62 _U and 62 _L respectively have one ends protruding from the bearing support base 73 and the bearing support arm 74 on the same side, and sprockets 79 are attached to these one ends. On the other hand, a motor (not shown) is disposed on the base 71, and an output sprocket is attached to the output shaft of the motor. A drive chain (not shown) is wound around the output sprocket and the sprocket 79. Therefore, when the motor is driven, the driving force of the motor is transmitted to the sprocket 79, that is, the heating rolls 62 _U and 62 _L through the driving chain, and as a result, the heating rolls 62 _U and 62 _L are connected to the acetate described above. According to the direction of travel of the tow 42, they are rotated in opposite directions.

Heating roll 62 _U has a mold 62a of the ring on the outer circumferential surface thereof, the mold 62a has a larger outer diameter than the heating roll 62 _U, positioned in the center between the pair of bearing support arms 74 Yes. On the other hand, the heating roll 62 _L also has a ring-shaped molding die 62 b having a larger diameter than the heating roll 62 _L on the outer peripheral surface, and the molding die 62 b is positioned at the center between the pair of bearing support bases 73. . That is, the

molds

62a and 62b are positioned on the same vertical plane that passes through the center between the axes of the pair of air cylinders 75a.

The molding dies 62a and 62b have the above-described molding teeth on their outer peripheral surfaces, and these molding teeth cooperate with each other to form a molding gap for the acetate tow 42. The size of the forming gap, that is, the forming pressure applied to the acetate tow 42 is determined by the inter-axis distance between the

roll shafts

80 and 81 in the heating rolls 62 _U and 62 _L.
Since the pair of air cylinders 75a as described above can raise and lower the heating roll 62 _U to the heating roll 62 _L, molding pressure (axial distance) can be adjusted by the expansion and contraction of the pair of air cylinders 75a.

Specifically, the molding pressure is adjusted to approximately 2000 kgf / m ² . Further, when the heating rolls 62 _U and 62 _L are rotated, the peripheral speed of the

molds

62a and 62b is, for example, 200 m / min.
In addition, in order to adjust the magnitude | size of the shaping | molding gap mentioned above, the corrugating apparatus 70 contains a gap adjuster (not shown), for example. Specifically, the gap adjuster includes wedge members that are respectively sandwiched between the bearing support base 73 and the bearing support arm 74 on the corresponding side.

Furthermore, the heating rolls 62 _U and 62 _L have a pair of support tires 63a. These support tires 63a have a ring shape, are attached to the outer peripheral surface of the corresponding heating roll 62, and are arranged at an equal distance from the

molds

62a and 62b. Specifically, the support tire 63a has the same outer diameter as the outer diameters of the

molds

62a and 62b.
Supporting tire 63a of the heating roll 62 _L is rolling contact respectively from above the tire rest 78 of the roller-shaped. Each tire rest 78 is rotatably supported by a holder 83, and these holders 83 are fixed on a base 71.

On the other hand, support the tire 63a of the heating roll 62 _U is rolling contact respectively from below to the tire rest 78 of the roller-shaped. These tire rests 78 are rotatably supported by a holder 83, and these holders 83 are attached to the lower surface of the beam member 76. The beam member 76 extends horizontally and couples a pair of bearing support arms 74 to each other. Therefore, the tire rest 78, regardless of the elevation of the heating roll 62 _U, it can be contacted at all times rolling in the corresponding holder 83.

Since the support tire 63a and the tire rest 78 described above increase the support points of the corresponding heating rolls 62 _U and 62 _L , the load applied to the

roll shafts

81 and 80 is reduced, and the deflection of the

roll shafts

81 and 80 is reduced. Stop without fail. As a result, the parallelism of the

roll shafts

81 and 80 in the heating rolls 62 _U and 62 _L is maintained with high accuracy.
Note that openings 76a and 77a are formed in the beam member 76 and the top plate 77, respectively. These openings 76a, 77a are positioned above the upper side of the heating roll 62 _U.

Furthermore, the heating roll 62 is provided with a heating device 64 integrated therein. Specifically, as shown in FIG. 9, the heating roll 62 is hollow, and the inside of the roll body is partitioned into an outer sealed chamber 66 and a coil chamber 65 surrounded by the sealed chamber 66. The sealed chamber 66 is formed over the entire length of the heating roll 62, and a heat medium is sealed in the inside thereof in a negative pressure (vacuum) state. That is, the sealed chamber 66 provides a heat pipe structure on the outer peripheral surface of the heating roll 62.

On the other hand, an induction coil unit 68 is accommodated in the coil chamber 65, and the dielectric coil unit 68 extends in the axial direction of the heating roll 62. Specifically, the induction coil unit 68 includes a core and an induction coil wound around the core, and the induction coil has a pair of lead wires 67. These lead wires 67 are drawn out of the heating roll 62 through the roll shaft 81 and connected to a power source (not shown). Therefore, when a current is supplied from the power source to the dielectric coil, the dielectric coil generates a magnetic flux in the core. Since this magnetic flux induces an induced current in the outer peripheral wall of the heating roll 62, the outer peripheral wall self-heats due to resistance heat. Further, as described above, since the portion on the outer peripheral side of the heating roll 62 has a heat pipe structure, the outer peripheral wall of the heating roll 62 generates heat uniformly. As a result, the above-described forming die 62a is quickly heated by receiving heat from the outer peripheral wall of the heating roll 62. Specifically, the mold 62a is heated to approximately 200 ° C.

As is clear from the above description, each of the pair of heating rolls 62 _U and 62 _L is supported at both ends via the

roll shafts

81 and 80, while the forming die 62 a of the heating rolls 62 _U and 62 _L is provided. , 62b are positioned in the same vertical plane passing through the center between the axes of the pair of air cylinders 75a. Therefore, even if the molding pressure for the acetate tow 42 is increased, the axis of the heating roll 62 is not bent, and the molding gap between the molding dies 62a and 62b is maintained with high accuracy.

Further, since each of the pair of heating rolls 62 _U and 62 _L is also supported by the tire rest 78, the support points for supporting the pair of heating rolls 62 _U and 62 _L are increased. The load applied to the

roll shafts

81 and 80 of the pair of heating rolls 62 _U and 62 _L is reduced, and the bending of the

roll shafts

81 and 80 is surely prevented. As a result, since the roll axis parallelism in the heating roll is maintained with high accuracy, the corrugating apparatus 70 is suitable for processing a corrugated tape 14t, that is, a thin and narrow web such as a cigarette filter material. is there.

On the other hand, since the plasticizer applied to the acetate tow 42 is preliminarily heated in the tank device 54 as described above, the heating temperature of the heating roll 62, that is, the

molds

62a and 62b is suppressed. In a state, that is, in a state in which the welding of the acetate tow 42 to the

molds

62a and 62b is prevented, the temperature of the acetate tow 42 can be increased.
As a result, according to the corrugating device 70 described above, the production speed of the corrugated tape 14t can be increased, that is, the productivity can be improved while maintaining the quality of the corrugated tape 14t.

Further, when the acetate tow 42 is formed on the corrugated tape 14t, a plasticizer vapor is generated between the

molds

62a and 62b, that is, from the molding gap. This vapor passes through the openings 76a and 77a described above, and the vapor of the support frame 69 is generated. It is discharged to the outside and the vapor does not adversely affect the quality of the corrugated tape 14t.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, the molding pressure of the acetate tow 42 can also be imparted to the heating roll 62 _U by a single air cylinder. Specifically, the air cylinder is disposed in the same vertical plane as the molding die 62a and is connected to, for example, the beam member 76 described above. In this case, the side wall 72 of the support frame 69 has openings for allowing the vapor of the plasticizer to escape instead of the openings 76a and 77a described above.

Further, the support tire 63a and the tire rest 78 are not necessarily required, and the heating roller 62 may only be supported at both ends via the roller shaft.

DESCRIPTION OF SYMBOLS 1 Filter cigarette 2 Cigarette 8 Chip paper 10 Corrugated filter 12 Filter core 14 Corrugated sheath (wrapping material)
14t corrugated tape (wrapping material)
16 Wrapping paper (paper web)
18 Molded paper 20

Manufacturing machine

22, 23 Tow bale 24 Guide rolls 26, 27 Opening section 30 First transfer path 32 Acetate tow (first tow material)
34 Banding jet 36 Pretension roll 38 Blooming roll 40 Second transfer path 42 Acetate tow (second tow material)
44 Blocking

portions

50 and 51 Plasticizer coating section 52 Coating roll 53 Felt 54 Tank device 55 Supply pipe 56 Heater 60 Thermoforming section 62 Heating rolls 62a and 62b Mold 63a Support tire 64 Heating device (heating source)
65 Coil chamber 66 Sealed chamber 67 Lead wire 68 Induction coil unit 69 Support frame 70 Corrugating device 71 Base 72 Side wall 73 Bearing support base (bearing device)
74 Bearing support arm (bearing device)
75 Connecting member 75a Air cylinder (pressing device)
76 Beam member 76a Opening 77 Top plate 77a Opening 78 Tire rest (rest device)
79

Sprocket

80, 81 Roll shaft 82 Guide roller 83 Holder 86 Trumpet guide (former)
88 Wrapping section 90 Filter rod

Claims

A first transfer path for transferring a first tow material as a cigarette filter material toward the end;
A molding machine disposed in the first transfer path and allowing the first tow material to pass therethrough, and when the first tow material passes, the molding machine for converging the first tow material and molding a filter core; ,
A second transfer path for transferring a second tow material toward the end of the first transfer path, and forming a tape-shaped packaging material from the second tow material in the transfer process;
It is disposed at the end of the first transfer path, receives the filter core from the molding machine, the packaging material and the paper web from the second transfer path, and molds a corrugated rod that wraps the filter core with the packaging material. A wrapping section for forming a filter rod in which the corrugated rod is wrapped with the paper web;
A thermoforming section that is disposed in the second transfer path and thermoforms the wrapping material toward the wrapping section to corrugate tape to make the filter rod a corrugated rod;
The thermoforming section is
A pair of heating rolls arranged with the second transfer path in between and having roll shafts respectively protruding from both end faces;
Ring-shaped corrugated molds provided on the outer peripheral surface of each heating roll, and these corrugated molds cooperate with each other to allow the packaging material to pass through and heat a large number of vertical grooves in the packaging material. A mold that defines a molding gap for molding; and
A heating source that is built in the heating roll and heats the corrugating mold through the heating roll;
A bearing device that rotatably supports the pair of heating rolls at both ends of the roll shaft;
A cigarette comprising: a pressing device that presses one heating roll toward the other heating roll and applies a uniform forming pressure along the width of the forming gap to the packaging material passing through the forming gap. Filter manufacturing machine.
The cigarette filter according to claim 1, wherein the pressing device includes a pair of air cylinders, and the air cylinders press the one heating roll via the bearing devices on both sides of the one heating roll. machine.
3. The cigarette filter manufacturing machine according to claim 2, wherein the mold is positioned at the center between the bearing devices.
A pair of rest devices spaced apart from each other along the axial direction of the heating roller and sandwiching the mold, further comprising a rest device that supports the heating rolls by rolling contact with each other. The cigarette filter manufacturing machine according to claim 2.
The heating source is
An induction coil for heating the outer peripheral wall of the heating roll;
The cigarette filter manufacturing machine according to claim 2, further comprising a heat pipe structure using the outer peripheral wall.
The cigarette filter manufacturing machine according to claim 2, further comprising a preheating device that preheats the second tow material upstream of the thermoforming section.
The manufacturing machine further includes a coating section disposed upstream of the thermoforming section and for applying a plasticizer to the second tow material,
The cigarette filter manufacturing machine according to claim 6, wherein the preheating device includes a heater that preheats a plasticizer applied to the second tow material.
In the transfer process of the first tow material as the filter material of the cigarette, the pre-process for converging the first tow material and forming it into a filter core;
A post-process for forming a filter rod by further wrapping the filter element with a paper web while forming the filter element by wrapping the filter core with a wrapping material made of a second tow material;
Prior to forming the filter element in the subsequent step, a thermoforming process in which the packaging material is thermoformed into a corrugated tape having a number of longitudinal grooves so that the filter rod formed in the subsequent step becomes a corrugated rod; With
The thermoforming process is
When the packaging material passes through a molding gap defined between a pair of heating rolls, a molding pressure is applied to the packaging material, and the packaging material is thermoformed into the corrugated tape,
Here, in a state where the pair of heating rolls are rotatably supported at both ends of the roll shaft, one heating roll is pressed toward the other heating roll, and the forming gap A method for producing a cigarette filter, wherein a uniform molding pressure along the width is applied.