CN115553494A

CN115553494A - Paperless filter stick forming equipment and method

Info

Publication number: CN115553494A
Application number: CN202210731853.7A
Authority: CN
Inventors: 余昔灿
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-25
Filing date: 2022-06-25
Publication date: 2023-01-03

Abstract

Aiming at solving the problem that the existing paperless filter stick forming equipment can only produce common paperless filter sticks and paperless hollow filter sticks with simple shapes; only a continuous central cavity shape can be produced; the cloth belt is required to be compacted in the forming process, so that the texture of the cloth belt is printed on the surface of the filter stick, and the quality of the cigarette is influenced; the invention provides a paperless filter stick forming device and a method, which overcome the defects that the modified filter stick forming machine cannot produce common filter sticks and the like, and comprises the following steps: a filament catcher (50), a forming mandrel (60), a forming nozzle (30) and curing nozzles (40, 41, 42, 43); the filament trap (50), the forming mandrel (60), the forming nozzle (30) and the curing nozzle (40, 41, 42, 43) are all connected to a fluid source.

Description

Paperless filter stick forming equipment and method

Technical Field

The invention belongs to the tobacco industry, and particularly relates to equipment and a method for forming a filter stick.

Background

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

In the tobacco industry, common filter sticks are solid cylindrical products, the outer surfaces of which are wrapped by wrapping paper and are prepared by a tow opener and a filter stick forming machine. With the development of the industry, the filter stick with a unique inner cavity and/or outer contour shape has the functions of brand image representation, anti-counterfeiting and the like, is popular with cigarette consumers, and is generally not wrapped by wrap paper, so that the filter stick is called a paperless filter stick. Generally, a solid cylindrical paperless filter stick is called a common paperless filter stick, a cylindrical paperless filter stick with a cavity in the center is called a paperless hollow filter stick, a paperless filter stick with a non-cylindrical outer contour is called a paperless outer shape filter stick, and a paperless filter stick with a cavity in the center and a non-cylindrical outer contour is called a paperless double-shape filter stick. Classic central cavity shapes such as circles, pentagons, peaches, etc., and classic outer contour shapes such as teeth, petals, etc.

The existing equipment is to prepare the common paperless filter stick and the paperless hollow filter stick by modifying and adding parts on the cigarette gun forming section of the filter stick forming machine, and has the defects of multiple defects and low efficiency: only common paperless filter sticks and paperless hollow filter sticks with simple shapes can be produced; only a continuous central cavity shape can be produced; the cloth belt is required to be compacted in the forming process, so that the texture of the cloth belt is printed on the surface of the filter stick, and the quality of the cigarette is influenced; the modified filter stick forming machine cannot produce common filter sticks and the like.

Disclosure of Invention

The invention aims to provide a device and a method for forming a paperless filter stick, which overcome the defects of the background technology and can be used for producing common paperless filter sticks, paperless hollow filter sticks, paperless filter sticks with external shapes and paperless double-shaped filter sticks, wherein the shapes of a central cavity and an external contour can be simple or complex; intermittent central cavity shapes can be produced; the surface of the filter stick does not have cloth tape textures because the cloth tapes are not required to be compacted in the forming process, and the capability of the filter stick forming machine for producing common filter sticks is not influenced after the filter stick forming machine is additionally provided with the device.

The technical scheme adopted by the invention is as follows:

a preparation method of a paperless filter stick comprises the following steps:

opening the fiber tows by an opener;

applying a plasticizer to the fiber tow;

the fiber tows are further fluffed, gathered and conveyed downstream by the fluid;

the filament bundle enters a forming nozzle through a forming mandrel, and is basically shaped into an inner cavity outer contour shape corresponding to the forming mandrel and the forming nozzle through fluid treatment, extrusion and temperature rise;

the basically shaped filter stick sequentially enters one or more curing nozzles to obtain fluid curing in each nozzle, and final shaping is completed;

the shaped filter stick is dragged forwards by the filter stick forming machine, and is cut to obtain a paperless filter stick with the length required by the next process.

According to the method, the paperless filter stick forming device comprises:

the filament trap 50 passes the fiber tow material 10 opened via the tow opener 11 through its body by the fluid 72 and is further fluffed;

a forming mandrel 60, located in the center of the fiber catcher 50, for injecting a fluid 71 into the fluffy fiber tow 10 to facilitate its formation;

a forming nozzle 30, wherein the injection fluid 70 extrudes and heats the fiber tows to form the overall shape of the filter stick;

the

curing nozzles

40, 41, 42, 43

inject fluid

73, 74, 75, 76 respectively therein to cure the filter rods;

positioning stage 80 may be actuated mechanically or electrically to adjust the orientation or position of forming mandrel 60 and wire trap 50;

the forming mandrel holder 61 may be actuated mechanically or electrically to adjust the angle of the forming mandrel 60.

Drawings

The present invention is described herein with reference to the accompanying drawings, wherein like reference numerals refer to like elements, and in which:

figure 1 is an exemplary embodiment of a paperless filter plug making apparatus.

Figure 2 is an exemplary embodiment of a wire trap of a paperless filter rod making apparatus.

Figure 3 is an exemplary embodiment of a wire trap of a paperless filter rod making apparatus.

Figure 4 is an exemplary embodiment of a wire trap of a paperless filter rod making apparatus.

Figure 5 is an exemplary embodiment of a wire trap of a paperless filter rod making apparatus.

Figure 6 is an exemplary embodiment of a forming mandrel for a paperless filter rod making apparatus.

Figure 7 is an exemplary embodiment of a forming mandrel for a paperless filter plug forming device.

Figure 8 is an exemplary embodiment of a forming mandrel for a paperless filter rod making apparatus.

Figure 9 is an exemplary embodiment of a forming mandrel for a paperless filter rod making apparatus.

Figure 10 is an exemplary embodiment of a plug wrap mandrel holder for a paperless filter rod making apparatus.

Figure 11 is an exemplary embodiment of a plug wrap mandrel holder for a paperless filter rod making apparatus.

Figure 12 is an exemplary embodiment of a plug wrap mandrel holder for a paperless filter rod making apparatus.

Figure 13 is an exemplary embodiment of a forming nozzle of a paperless plug forming device.

Figure 14 is an exemplary embodiment of a forming nozzle of a paperless plug forming device.

Figure 15 is an exemplary embodiment of a forming nozzle of a paperless plug forming device.

Figure 16 is an exemplary embodiment of a forming nozzle of a paperless plug forming device.

Figure 17 is an exemplary embodiment of a forming nozzle of a paperless plug forming device.

Figure 18 is an exemplary embodiment of a positioning station of a paperless filter plug forming apparatus.

Figure 19 is an exemplary embodiment of a positioning station of a paperless filter plug forming apparatus.

Figure 20 is an exemplary embodiment of a positioning station of a paperless filter plug forming apparatus.

Figure 21 is an exemplary embodiment of a curing nozzle of a paperless plug wrap device.

Figure 22 is an exemplary embodiment of a curing nozzle of a paperless plug wrap device.

Figure 23 is an exemplary embodiment of a curing nozzle of a paperless plug wrap device.

Detailed Description

Aspects of the present invention are described below in the description of the embodiments of the present invention and the related drawings are exemplary, and are intended to provide further explanation of the invention and not to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made to the present invention, and modifications, substitutions, equivalents, improvements, etc. can be made without departing from the spirit or scope of the present invention.

It is to be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and are used only to describe specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and further it is to be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components and/or combinations thereof.

In accordance with exemplary embodiments of the present invention and with general reference to the drawings, a paperless filter rod forming method and apparatus are now disclosed.

Referring to fig. 1, fiber tow 10 is supplied through a tow opener 11, and the paperless filter rod making apparatus 100 processes the tow to form a continuous filter rod 16, which is then supplied to a filter rod making machine 20 at a certain speed for subsequent cutting and separation to form a paperless filter rod of the length required by the next process. The tow 10 may be in various forms, single bale, double bale, sheet, rope, etc., and the tow opener 11 may be in various forms, single opener, horizontal or vertical double opener, equipped with a plasticizer application device. Throughout the process, the rod maker 20 applies a certain pulling force to the filter rods 16.

Referring to fig. 1, the paperless filter rod making apparatus 100 is installed between the tow opener 11 and the making machine 20, and the operation speed is synchronized with the filter rod making machine 20, and the synchronization is realized by data communication or by additionally installing a speed measuring device on the making machine 20.

The fiber trap 50, through the body of which the fiber tow material 10 is passed by the fluid 72 and somewhat fluffed, is fed to the forming nozzle 30 around the front end of the forming mandrel holder 61 and the forming mandrel 60.

The fiber trap 50, referring to fig. 2, preferably comprises a fluid buffer chamber 509 and three sections required for the process, namely an inlet section 501, a converging section 502, a fluid outlet 551 and an outlet section 503, which are formed by an outer body 504 and an inner body 505 of the fiber trap, coaxially or non-coaxially, wherein the distance between the two walls forming the buffer chamber is 0.3 to 5mm, the fiber tow material 10 enters through the inlet section 501, is gradually converged at the converging section 502 and is then treated by the fluid 72 at the fluid outlet 551, and the fluid 72 both puffs and urges the fiber tow material 10 towards the axial center of the fiber trap 50 and the outlet section 503, and optionally also performs certain treatments such as heating. Preferably, the length of the output section 503 is 10 to 100mm, the cross section of the cavity in the delivery section 503 is a circle with a diameter of 10 to 50mm, and the length and the proportion of the introduction section 501 and the convergence section 502 can be any.

In the filament trap 50, referring to FIG. 2, the fluid outlet 551 may be a gap of 0.3 to 3mm formed by the outer body 504 and the inner body 505 of the filament trap, or any number and size of fluid ejection holes 515 as provided with reference to FIG. 5. Preferably, the inner wire trap body 505 is supported on the outer wire trap body 504 by a sealed cavity 506, which may be part of the inner wire trap body 505 or the outer wire trap body 504, or any other fastening means that provides a sealing effect.

The outer filament trap body 504 can be square, rectangular, circular, tunnel-shaped, or a combination thereof in cross-section. The cross section of the leading-in section 501 of the internal body 505 of the silk catcher can be square, rectangular, circular or a combination of the square, the rectangular and the circular, the section of the converging section 502 is gradually converged from the section of the leading-in section 501 to the section of the circular, and the section of the output section is the section of the circular.

Wire trap 50 is provided with holes for introducing fluid 72 into fluid buffer chamber 509, the holes having a diameter of 3 to 18mm and being 1 to 5 in number, and may be of any size, and may be located at any position and angle of wire trap 50.

The wire trap 50, in another exemplary embodiment, and with reference to FIG. 3, the inner body 505 of the wire trap may be provided with an annular boss 507 at the tail portion to facilitate determination of the size of the fluid outlet 551, and with reference to FIG. 4, the annular boss 507 may be further provided with an identification scale 508.

The forming mandrel 60 and the forming nozzle 30 process the fiber tow 10 into a desired internal cavity and/or external profile shape before further processing. The shaping mandrel 60 and the shaping nozzle 30 are preferably of cylindrical configuration but may be of any regular or irregular configuration, the shaping mandrel 60 handling the positioning and shaping of the filter rod lumen shape and the shaping nozzle 30 handling the shaping of the filter rod outer profile, as both act together on the fiber tow 10, with some effect on each other.

The forming mandrel 60, referring to fig. 6, is provided with a forming mandrel holder 161 and a forming mandrel body 162. Preferably, the forming mandrel body 162 is coaxial with the forming mandrel seat 161, and preferably the mandrel seat 161 may be further provided with injection holes 163 through which the fluid 71 passes, preferably the number of the injection holes 163 is 4 to 8, the diameter range is 0.5 to 2mm, and the injection holes are uniformly distributed on the circumference of the mandrel body section circumcircle with equal distance of 0.5 to 2mm.

In another exemplary embodiment of forming mandrel 60, as shown in fig. 8, forming mandrel base 161 and forming mandrel body 162 may be an assembly, and preferably, an annular cavity 164 may be further provided between forming mandrel body 162 and forming mandrel base 161 to pass more fluid 71.

The forming mandrel 60, referring to the shape example in fig. 9, the cross section of the forming mandrel body 162 may be any shape, may be a continuous same or different cross section, and the diameter of the circumscribed circle of the cross section ranges from 1.5 to 6.5mm. The molded mandrel body 162 may be any length.

The forming mandrel holder 61, as shown in fig. 10, is composed of four tubes, a tail tube 601, a vertical tube 602, a horizontal tube 603 and a taper tube 604, which are arranged in an approximate Z shape, the taper tube 604 is connected to form the forming mandrel 60, and the fluid 71 sequentially passes through the above components to enter the forming mandrel 60. The horizontal tube 603 and the cone 604 are coaxial and coaxial with the inner body 504 of the wire trap. The four-tube lumen is circular with a diameter of 5 to 20mm or other shapes with equal cross-sectional area, and the bevel 606 of the cone 604 is 2 to 10 degrees. The center distance between the tail pipe 601 and the horizontal pipe 603 ranges from 40 mm to 90mm.

The former mandrel holder 61, in another exemplary embodiment, as shown in figure 11, is provided with an actuating device 605 which continuously and intermittently actuates the horizontal tube 603 and or the conical tube 604, which in turn actuates the former mandrel 61 to further increase the change in the shape of the filter rod lumen.

The former mandrel holder 61, in another exemplary embodiment, as shown in FIG. 12, the tailpipe 601, vertical pipe 602, horizontal pipe 603, and taper pipe 604 may be partially or completely unitary.

The forming nozzle 30, referring to fig. 13 and 14, is provided with a melting chamber 120, a compacting chamber 121, and a solidifying chamber 126. The fibrous tow material 10 is subjected to the

fluids

70, 71 in the melt chamber 120 prior to further processing, and is consolidated and sized in the consolidation chamber 121 to form a substantially paperless filter rod, which is consolidated on the surface via the consolidation chamber 126. The total length of the melting chamber 120, the compacting chamber 121 and the solidifying chamber 126 ranges from 30 to 120mm, and the respective lengths and the proportional relationship can be any values.

The cross section of the forming nozzle 30, the melting cavity 120, the compacting cavity 121 and the solidifying cavity 126 can be in any shape, such as a circle, a star, a petal, a polygon and the like as an example in fig. 16, so that a corresponding outer contour shape paperless filter stick can be prepared, and the diameter of a cross-section circumcircle ranges from 3.5 mm to 9mm.

The molding nozzle 30 may be provided with a mounting seat 124 and may also be provided with a detection hole 125.

The outer contour 123 of the shaping nozzle 30 is preferably cylindrical with a cross-sectional diameter of 6.3 to 20mm, but may also have other shapes such as square or rectangular.

The forming nozzles 30 preferably inject the fluid 70 through the outer contoured 123 surfaces and end faces toward the melt cavity 120 and/or the densified section 121.

In another embodiment of the forming nozzle 30, as shown in FIG. 16, fluid injection holes 127 may be provided in the outer contour 123 to inject the fluid 70 into the melt chamber 120 and/or the compaction chamber 121, the fluid injection holes 127 having a diameter in the range of 0.5 to 2mm, a number of 4 to 24, and an angle of 10 to 75 degrees with respect to the axis.

On the same apparatus, the number of shaping nozzles 30 is 1 to 3, in an advantageous embodiment 1.

Positioning station 80, referring to fig. 18, the positioning station 80 may be actuated mechanically or electrically to adjust the orientation or position of the forming mandrel 60 and filament trap 50 relative to the forming nozzle 30 throughout the process, thereby changing the position of the filter rod lumen shape relative to the outer profile and the continuity of the lumen shape. The positioning

table positioning actuators

803, 802, 801 adjust the position and direction of the forming mandrel 60 and the wire catcher 50 in three directions of the axis of the three-dimensional coordinate system X, Y, Z, respectively. Further, by appropriately controlling the positioning and frequency of the X-axis, it is possible to produce a paperless filter rod having such an intermittent cavity shape as in fig. 19 and such a continuously changing cavity shape as in fig. 20. The

actuators

803, 802, 801 are located on the same side, with the side near the operator being a manual knob and the opposite side optionally being an electric automatic drive mechanism. The three-dimensional directions of the positioning table are provided with scales to indicate the current position.

In another exemplary embodiment, the wire trap 50, the forming mandrel 60, the forming nozzle 30, some or all of which may not necessarily be separate open pieces, but rather are rigidly connected as one and/or closed piece.

After treatment with the forming mandrel 60 and forming nozzle 30, the tow 10 has been formed into a preform filter rod 15.

The curing nozzles 40, 41, 42, 43 introduce

fluids

73, 74, 75, 76, respectively, to surface and internally treat the preform filter rod 15 to further enhance the intrinsic quality (e.g., hardness, stability of the internal and external cavity shapes, straightness, moisture, etc.) and the external quality (e.g., surface roughness, etc.) of the filter rod, as well as further remove portions of the intrinsic and external plasticizer from the filter rod under the influence of the fluids.

The curing nozzles 40, 41, 42, 43, referring to fig. 21, are provided with a guide chamber 401, a seal chamber 403, a buffer chamber 404, and a process chamber 402.

The curing nozzles 40, 41, 42, 43, in an exemplary embodiment, introduce the preformed filter rods 15 into the curing

nozzles

40, 41, 42, 43 from the guide chamber 401 prior to further processing to form an approximate seal with the seal chamber 403, receive the fluid 73, 74, 75, 76 in the treatment chamber 402, respectively, and buffer a portion of the fluid in the buffer chamber 404 for pretreatment of subsequent preformed filter rods 15.

Curing

nozzles

40, 41, 42, 43, in another exemplary embodiment, the process flow is reversed from that of the previous example, i.e. the filter preform 15 is treated with

fluid

73, 74, 75, 76 in a treatment chamber 402 before further treatment, a portion of the fluid is buffered in a buffer chamber 404 for further treatment of the filter preform 15, the filter preform 15 forms a similar seal with the seal chamber, and the curing

nozzles

40, 41, 42, 43 are then directed from the guide chamber 401. In the two example modes, the processing sequence is different, and the formed seal has certain driving or retarding effect on the advance of the primary filter stick, so that different effects are achieved.

The curing nozzles 40, 41, 42, 43 may be provided with a mount 406.

The outer contour 405 of the curing

nozzles

40, 41, 42, 43 is preferably cylindrical with a diameter of 5.3 to 20mm, but may also have other shapes such as square or rectangular.

Curing

nozzles

40, 41, 42, 43 inject

fluids

73, 74, 75, 76, respectively, preferably through outer contour 405 surfaces and end faces, towards process chamber 402 and/or buffer chamber 404.

Curing

nozzles

40, 41, 42, 43, fig. 22, may inject

fluids

73, 74, 75, 76 into process chamber 402 and/or buffer chamber 404, respectively, by providing fluid injection holes 407 on outer profile 405, with fluid injection holes 407 ranging from 0.5 to 2mm in diameter and 4 to 24 in number, at a relative axial angle of 10 to 75 degrees.

The guide chamber 401, the seal chamber 403, the treatment chamber 402 and the buffer chamber 404 of the curing

nozzles

40, 41, 42, 43 are preferably circular in cross section in this embodiment example, and as illustrated in fig. 23, the cross section may be any shape, and the diameter of the circumscribed circle of the cross-sectional shape is in the range of 3.5 to 12mm.

On the same apparatus, the curing

nozzles

40, 41, 42, 43 can be in the same or in different combinations of embodiment examples, in the same or in different directions, in a number of 2 to 8, in an advantageous example 4.

The

fluids

70, 71, 72, 73, 74, 75, 76 may be the same or different, homologous, or heterologous fluids, and provide treatment, such as heating, cooling, fluid pushing, negative pressure, chemical reaction, or combinations thereof, to the fiber tow 10 or the preform filter rod 15. In one advantageous example, the

fluids

70, 71 are 110-180 degrees Celsius saturated steam, and 72, 73, 74, 75, 76 are 0.06 to 0.4MPa of compressed air.

The

fluids

70, 71, 72, 73, 74, 75, 76 may be used in series in connection with multiple stations, mixed for use in the same station, or recycled at the same station.

Throughout the process, the fluid regulation and switching

control devices

90, 91, 92, 93, 94, 95, 96 may be autonomously automatically or manually regulated by the master control system and indicate the current values.

Claims

1. A paperless filter stick forming device is characterized in that: the device is arranged between a tow opener and a filter stick forming machine, and the running speed is synchronous with the filter stick forming machine; and comprises the following components in sequence along the moving direction of the tows: the device comprises a silk catcher, a forming mandrel, a forming nozzle and a curing nozzle; the wire catcher, the forming mandrel, the forming nozzle and the curing nozzle are all connected with a fluid source.

2. A preparation method of a paperless filter stick comprises the following steps: opening a fiber tow by an opener;

(2) Applying a plasticizer to the fiber tow; (3) The fiber tows are further fluffed, gathered and pushed to the downstream by fluid; (4) The tows enter a forming nozzle through a forming mandrel, and are basically shaped by fluid treatment, extrusion and temperature increase; (5) The basically shaped filter stick sequentially enters one or more curing nozzles to obtain fluid curing in each nozzle, and shaping is completed; (6) The shaped filter stick is dragged forwards by the filter stick forming machine, and is cut to obtain a paperless filter stick with the length required by the next process.

3. The paperless filter rod making machine of claim 1, wherein: the silk catcher mainly comprises an inner body and an outer body, the distance between two walls of a buffer chamber formed between the two bodies is 0.3-5 mm, the length of the output section is 10-100 mm, the section of a cavity in the conveying section is a circle with the diameter of 10-50 mm, the inner body and the outer body also form a fluid outlet with the diameter of 0.3-3 mm, and the number of holes of the silk catcher is 1-5 with the diameter of 3-18 mm.

4. A paperless filter rod apparatus as claimed in claim 1 wherein: the shaping dabber mainly by the integrative singlepiece or the subassembly that shaping dabber seat and shaping dabber body are constituteed, is provided with 4 to 8 diameter range jet orifices for 0.5 to 2mm evenly distributed on dabber body cross-section circumscribed circle equidistance 0.5 to 2 mm's circumference, dabber body cross-section circumscribed circle diameter range is 1.5 to 6.5mm.

5. A paperless filter rod apparatus as claimed in claim 1 wherein: the forming mandrel frame mainly comprises 4 pipelines which are arranged in a Z shape to form a combined or integrated structure, the horizontal pipe and the taper pipe are coaxial and coaxial with the inner body of the wire catcher, the inner cavity of the pipe is in a circular shape with the diameter of 5-20 mm or other shapes with the same sectional area, the bevel angle of the taper pipe is 2-10 degrees, and the central distance between the tail pipe and the horizontal pipe is 40-90 mm.

6. A paperless filter rod apparatus as claimed in claim 5 wherein: the forming mandrel carrier is provided with an actuating device.

7. A paperless filter rod apparatus as claimed in claim 1 wherein: the forming nozzle is mainly composed of a melting cavity, a compaction cavity and a solidification cavity, the total length of the three cavities ranges from 30 mm to 120mm, the diameter of a cross section circumscribed circle of the three cavities ranges from 3.5 mm to 9mm, the outer contour of the forming nozzle is cylindrical with the cross section diameter of 6.3 mm to 20mm, and fluid is injected into the inner cavity through the surface and the end face of the outer contour.

8. A paperless filter rod apparatus as claimed in claim 7 wherein: the molding nozzle is provided with 4 to 24 fluid injection holes having a diameter of 0.5 to 2mm and an inclination angle of 10 to 75 degrees.

9. A paperless filter rod apparatus according to claim 1, wherein: the positioning table can be mechanically or electrically driven to perform three-dimensional coordinate actuation, a manual actuator is positioned on one side of an operator, and an electric actuator is positioned on the other side.

10. A paperless filter rod apparatus as claimed in claim 1 wherein: the curing nozzle is mainly composed of a guide cavity, a sealing cavity, a processing cavity and a buffer cavity, the diameter range of the circumscribed circle of the cross-sectional shape of the four cavities is 3.5-12 mm, fluid of the curing nozzle is injected into the inner cavity in a mode that the fluid passes through the surface and the end face of an outer contour or is provided with 4-24 fluid injection holes with the diameter range of 0.5-2 mm, the number of the fluid injection holes is 10-75 degrees relative to an axis, and the outer contour of the curing nozzle is cylindrical with the diameter of 5.3-20 mm.

11. A paperless filter rod apparatus as claimed in claim 1 wherein: the fluid for the forming mandrel and the forming nozzle is saturated steam at 110-180 ℃, and the fluid for the curing nozzle is compressed air at 0.06-0.4 Mpa.