A hollow filter tip forming method

Abstract

The present application discloses a hollow filter forming method, comprising the following steps: S1, pre-treating a core body tow and a side body tow; S2, injecting the pre-treated core body tow into a first forming device, forming the core body tow into a core body and outputting it through the first forming device; S3, injecting the pre-treated side body tow into a second forming device, inputting the core body into a shaping cavity of a guide rod, and forming the core body and the side body tow into a hollow filter tip as a whole through a second forming device and outputting it; wherein the second forming device is coaxially sleeved on the outside of the guide rod, and an opening groove connecting the shaping cavity and the second forming device is provided in the circumference of the outlet end of the guide rod, so that the core body and the side body tow are in contact and integrally formed into a hollow filter tip. Compared with the prior art, the hollow filter tip forming method provided by the present application can form a hollow filter tip with a solid pattern, and has high forming efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of cigarette processing, and more specifically, to a method for forming a hollow filter tip. Background Art

[0002] The filter tip is an important component of modern cigarette products, which plays the role of filtering smoke, reducing tar delivery, and reducing harmful gas components. The filter tip uses diacetate fiber tow as the filling material to filter out particulate matter and harmful components in the smoke, thereby reducing the harm.

[0003] The filter tips in the prior art are often solid cylindrical filters or filters with hollow patterns inside. Due to technological advances, filter products are constantly being innovated. Hollow filter tips are a creative idea. Hollow filter tips are designed with various silhouette patterns according to needs. The content and artistic conception expressed by the pattern is a function, an idea, a story, a brand and a culture. While increasing the added value of the product, it also deepens consumers' understanding and recognition of the product image and enhances the brand image of cigarettes.

[0004] The filter in the prior art is formed by a tow, and during the forming process, the tow is often not a straight line perpendicular to the cross section of the filter, but an irregular curve intertwined with each other, which makes it difficult to form the hollow filter.

[0005] Therefore, there is an urgent need for a hollow filter forming method that can form a hollow filter with a solid pattern and has high forming efficiency. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the present application provides a hollow filter forming method, which can form a hollow filter with a solid pattern and has high forming efficiency.

[0007] The technical solutions provided by this application are as follows:

[0008] A hollow filter tip forming method comprises the following steps:

[0009] S1, pre-treating the core tow and the side tow;

[0010] S2, injecting the pre-treated core tow into the first forming device, forming the core tow into a core by the first forming device and outputting the core;

[0011] S3, the pre-treated side body tow is injected into the second molding device, the core body is input into the molding cavity of the guide rod, and the core body and the side body tow are integrally molded into a hollow filter tip by the second molding device and output;

[0012] Among them, the second molding device is coaxially sleeved on the outside of the guide rod, and the outlet end of the guide rod is circumferentially provided with an open groove connecting the molding cavity and the second molding device, so that the core body and the edge body tow are in contact and integrally formed into a hollow filter.

[0013] Preferably, after step S3, the following steps are also included:

[0014] S4, conveying the hollow filter tip to a shaping device, and cooling and shaping the hollow filter tip through the shaping device.

[0015] Preferably, the shaping device comprises:

[0016] A shaping piece, wherein a shaping cavity for receiving the hollow filter tip is provided in the shaping piece;

[0017] A shaping seat sleeved on the outer side of the shaping piece and sealedly connected to the shaping piece;

[0018] A cooling channel is connected to the molding cavity and is used to input dry cold air into the molding cavity, wherein the temperature of the dry cold air is 5°C to 10°C.

[0019] Preferably, at least two groups of the shaping devices are provided, and the shaping devices are arranged at intervals along the conveying direction of the hollow filter.

[0020] Preferably, the step S1 includes the following steps:

[0021] Opening the core tow and conveying it to the first forming device;

[0022] The edge body tow is opened and transported to between the second forming device and the guide rod.

[0023] Preferably, in step S2, the core tow is formed into a core by a first forming device and outputted, comprising the following steps:

[0024] Inputting the core tow into the first feeding mechanism to compress the core tow;

[0025] The compressed core body tow is input into the first forming mechanism and is thermoformed into a core body.

[0026] Preferably, the first feeding mechanism comprises:

[0027] A first feeding member, wherein a first accommodating cavity for accommodating the core yarn bundle is provided in the first feeding member;

[0028] A first feed seat sleeved on the outer side of the first feed member and rotatably connected to the first feed member, the first feed seat is connected to the support frame, and a first high-pressure air cavity is provided between the first feed seat and the first feed member;

[0029] A second air inlet passage provided on the first feed seat and used for inputting high-pressure gas into the first high-pressure gas cavity;

[0030] A first installation gap is provided between the first feed seat and the first feed member and is used to connect the first accommodating cavity and the first high-pressure gas cavity;

[0031] The second air inlet passage is provided with a regulating valve for adjusting the flow rate of the compressed gas.

[0032] Preferably, the first feeding mechanism further comprises:

[0033] A fastener is fixedly arranged at one end of the first feed seat, the fastener is sleeved on the outside of the first feed piece, and the fastener is connected to the first feed piece by a thread, the cross-sectional size of the ventilation section gradually increases toward the direction of the gas distribution section, and the first feed piece is rotated to adjust the first installation gap.

[0034] Preferably, the first forming mechanism further includes:

[0035] A first molding member coaxially arranged with the first accommodating cavity, wherein a first molding cavity is arranged in the first molding member;

[0036] A first steam supply device for inputting high-temperature steam into the first molding cavity to solidify and mold the core tow in the first molding cavity;

[0037] The temperature of the high-temperature steam is 110°C to 130°C.

[0038] Preferably, the cross-sectional shape of the first molding cavity is the same as the cross-sectional shape of the guide rod, and the cross-sectional shape of the first molding cavity is specifically any one of a Yellow Crane Tower pattern, a yellow crane pattern, a lightning pattern, a letter pattern or a number pattern.

[0039] The hollow filter tip forming method provided by the present invention, in order to facilitate the production of the hollow filter tip, converts the forming of the hollow filter tip into the forming of the core body and the side body, and there is a hollow part between the core body and the side body. First, the side body yarn bundle and the core body yarn bundle are pre-treated, and the pre-treated core body yarn bundle is injected into a first molding device, and the core body yarn bundle is molded into a core body by the first molding device and outputted, and the pre-treated side body yarn bundle is injected into a second molding device, and the molded core body is input into the molding cavity of the guide rod for molding, and the side body is molded by the second molding device. The body tow and the core body are formed into a hollow filter and output. In order to enable the connection between the side body and the core body, the second molding device is coaxially sleeved on the outside of the guide rod, and an opening is provided in the circumference of the outlet end of the guide rod. The opening is used to connect the molding cavity and the second molding device, so that the core body in the molding cavity can contact with the side body tow. The side body tow is wrapped on the outside of the core body and is integrally formed into a hollow filter under the action of the second molding device. When the filter is formed, the place where the guide rod is located becomes hollow after output, thereby forming a hollow filter. In this way, the hollow filter to be formed is divided into two stages for molding. First, a solid core body is formed. When the side body is formed, the side body and the core body are connected through the opening on the guide rod to form a hollow filter, which greatly reduces the molding difficulty of the hollow filter. It can be seen that compared with the prior art, the hollow filter molding method in the embodiment of the present invention can mold a hollow filter with a solid pattern, and the molding efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a hollow filter tip forming device provided in an embodiment of the present invention;

[0042] Figure 2 for Figure 1 A cross-sectional view of

[0043] Figure 3 A schematic diagram of the structure of a shaping device provided in an embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of a shaping device provided by an embodiment of the present invention from another perspective;

[0045] Figure 5 A schematic structural diagram of a first feeding mechanism provided in an embodiment of the present invention;

[0046] Figure 6 for Figure 5 A cross-sectional view of

[0047] Figure 7 A schematic diagram of the structure of the first feeding seat in an embodiment of the present invention;

[0048] Figure 8 A schematic structural diagram of a first feeding member provided in an embodiment of the present invention;

[0049] Fig. 9 A schematic structural diagram of a first forming mechanism provided in an embodiment of the present invention;

[0050] Fig.10 for Fig. 9 A cross-sectional view of

[0051] Fig.11 A schematic structural diagram of a first forming seat provided in an embodiment of the present invention;

[0052] Fig.12 for Fig.11 A cross-sectional view of

[0053] Fig.13 A schematic structural diagram of a first molded part provided in an embodiment of the present invention;

[0054] Fig.14 A cross-sectional view of a second molding device provided by an embodiment of the present invention;

[0055] Fig.15 for Fig.14 A cross-sectional view of

[0056] Fig.16 A schematic diagram of the structure of a guide rod provided in an embodiment of the present invention;

[0057] Fig.17 Fig.16 A partial enlarged view of the middle A;

[0058] Fig.18 A schematic structural diagram of a second molded part provided in an embodiment of the present invention.

[0059] Figure numerals: 11, first feed piece; 12, first feed seat; 13, first high-pressure air cavity; 14, second air inlet channel; 111, third feed section; 112, air inlet section; 113, air distribution section; 114, ventilation section; 15, fastener; 16, fourth sealing member; 121, first discharge cavity; 122, second cavity; 123, third cavity; 124, fourth cavity; 115, mounting groove; 20, first molding piece; 21, first molding cavity; 22, first molding seat; 23, first high-temperature cavity; 24, first air inlet channel; 25, exhaust Channel group; 26, first sealing member; 27, second sealing member; 28, heat dissipation channel; 30, guide rod; 31, opening; 32, first feed section; 33, first molding section; 34, second molding section; 35, fixing seat; 36, molding cavity; 321, flat surface; 41, second feed member; 42, second feed seat; 43, second high-pressure air cavity; 44, fourth air inlet channel; 50, second molding cavity; 51, second molding member; 60, support frame; 70, molding device; 71, molding member; 72, cavity; 73, molding seat; 74, cooling channel. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0062] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0064] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0065] The embodiments of the present invention are written in a progressive manner.

[0066] like Figures 1 to 18 As shown, an embodiment of the present invention provides a hollow filter forming method, comprising the following steps: S1, pre-treating a core body tow and a side body tow; S2, injecting the pre-treated core body tow into a first forming device, and forming the core body tow into a core body by the first forming device and outputting it; S3, injecting the pre-treated side body tow into a second forming device, and the core body is input into a molding cavity 36 of a guide rod 30, and the core body and the side body tow are integrally molded into a hollow filter by the second molding device and outputting it; wherein the second molding device is coaxially sleeved on the outer side of the guide rod 30, and an opening groove 31 connecting the molding cavity 36 and the second molding device is circumferentially provided at the outlet end of the guide rod 30, so that the core body and the side body tow are in contact and integrally molded into a hollow filter.

[0067] Traditional filters are often solid cylindrical filters or filters with hollow patterns inside. The filters are formed by tows. During the forming process, the tows are often not straight lines perpendicular to the cross section of the filter, but irregular curves intertwined with each other, which makes it difficult to form hollow filters. Specifically, the forming speed of the tow is relatively fast, while the conventional forming cavity for tow forming is relatively short, and the forming time is very short, almost instantaneous. The forming is completed before the flow of the tow in the cross section is completed.

[0068] The hollow filter tip forming method provided by the present invention converts the forming of the hollow filter tip into the forming of the core body and the forming of the side body. First, the side body tow and the core body tow are pretreated, and the pretreated core body tow is injected into a first forming device. The core body tow is formed into a core body and output by the first forming device. The pretreated side body tow is injected into a second forming device. The formed core body is input into the shaping cavity 36 of the guide rod 30 for shaping. The side body tow and the core body are formed into a hollow filter tip by the second forming device. And output, in order to enable the connection between the side body and the core body, the second molding device is coaxially sleeved on the outside of the guide rod 30, and an opening is provided in the circumference of the outlet end of the guide rod 30, and the opening is used to connect the shaping cavity 36 and the second molding device, so that the core body in the shaping cavity 36 can contact with the side body tow, and the side body tow is wrapped on the outside of the core body, and is integrally formed into a hollow filter under the action of the second molding device. When the filter is formed, the place where the guide rod 30 is located becomes hollow after output, thereby forming a hollow filter. In this way, the hollow filter to be formed is divided into two stages for molding. First, a solid core body is formed. When the side body is formed, the side body and the core body are connected through the opening on the guide rod 30, thereby forming a hollow filter, which greatly reduces the molding difficulty of the hollow filter. It can be seen that compared with the prior art, the hollow filter molding method in the embodiment of the present invention can mold a hollow filter with a solid pattern, and the molding efficiency is high.

[0069] In the above method, in order to shape the hollow filter tip, as one implementation, the hollow filter tip forming method provided in the embodiment of the present invention further includes the following steps after step S3: S4, conveying the hollow filter rod to the shaping device, and cooling and shaping the hollow filter through the shaping device. Under the action of the shaping device, the outer surface of the hollow filter tip is cooled and shaped.

[0070] Specifically, the shaping device 70 in the embodiment of the present invention includes a shaping piece 71, a shaping seat 73 and a cooling channel 74. A cavity 72 is arranged in the shaping piece 71, and the cavity 72 is used to receive the hollow filter. A shaping seat 73 is arranged on the outer side of the shaping piece 71, and the cooling channel 74 is arranged on the shaping seat 73, and the cooling channel 74 is connected with the cavity 72, and is used to input dry cold air into the cavity 72 to cool and shape the hollow filter in the cavity 72, wherein the temperature of the dry cold air is 5°C to 10°C, which can better and faster dry and cool the hollow filter.

[0071] Furthermore, in order to prevent dry cold air from leaking between the shaping seat 73 and the shaping member 71 and affecting the shaping effect of the shaping member 71, the shaping member 71 and the shaping seat 73 in the embodiment of the present invention are sealed and connected by a third sealing member. At least two third sealing members are provided, and are respectively provided on both sides of the cooling channel 74.

[0072] In the embodiment of the present invention, at least two groups of shaping devices 70 are provided, and the shaping devices 70 are arranged at intervals along the conveying direction of the hollow filter. The hollow filter after being formed passes through at least two groups of shaping devices 70 in sequence, and the hollow filter is shaped by the shaping devices 70. By providing at least two groups of shaping devices 70, in coordination with the forming speed of the core tow and the side tow, the hollow filter after being formed can be shaped better and faster.

[0073] Furthermore, the number of the shaping devices 70 in the embodiment of the present invention is preferably 2 to 5 groups.

[0074] In the above method, as one of the embodiments, the hollow filter forming method provided by the present invention includes the following steps in step S1: opening the core body tow and conveying it to the first forming device; opening the side body tow and conveying it to between the second forming device and the guide rod 30. As one of the embodiments, in the embodiment of the present invention, the first opening device can be used to open the core body tow, and the core body tow can be conveyed to the first forming device for forming, and the side body tow can be opened by the second opening device, and the side body tow can be conveyed to the second forming device. As another embodiment, in the embodiment of the present invention, a double-channel opening machine is used to simultaneously open the side body tow and the core body tow, wherein the core body tow is arranged in the lower channel, and the core body tow is conveyed to the first forming device for forming into a core body, and the side body tow is arranged in the upper channel, and the side body tow is conveyed to the second forming device to form a hollow filter together with the core body.

[0075] In order to enable the core body tow and the side body tow to be continuously fed to form a hollow filter, the feeding can be done by manual dragging or by other feeding devices. The side body tow and the core body tow are conveyed forward with constant traction tension. Furthermore, as one of the embodiments, the center lines of the first molding device, the guide rod 30, and the shaping device in the embodiment of the present invention are coaxially arranged, and the second molding device is coaxially sleeved on the outside of the guide rod 30. Furthermore, the hollow filter molding device corresponding to the hollow filter molding method in the embodiment of the present invention also includes a support frame 60, wherein the first molding device, the second molding device, the guide rod 30, and the shaping device are all fixedly arranged on the support frame 60.

[0076] In the above method, as one of the embodiments, in step S2 of the embodiment of the present invention, the core tow is formed into a core and output by the first forming device, including the following steps: the core tow is input into the first feeding mechanism, and the core tow is compressed; the compressed core tow is input into the first forming mechanism, and is thermoformed into a core. Since the core tow and the side body tow are fluffy filaments with a certain thickness, the width of the core tow and the side body tow is about 220mm; therefore, the core tow and the side body tow need to be compressed to a certain extent in advance to enable better thermoforming.

[0077] Furthermore, in the embodiment of the present invention, at least one first feeding mechanism is provided. When at least two first feeding mechanisms are provided, the first feeding mechanisms are arranged at intervals along the direction of transmission of the core filament bundle, and the first feeding mechanisms are arranged coaxially.

[0078] Specifically, the first feeding mechanism includes a first feeding piece 11, a first feeding seat 12 and a second air inlet channel 14, wherein a first accommodating chamber is arranged in the first feeding piece 11, and the first accommodating chamber is used to receive the core fiber bundle. The first feeding seat 12 is coaxially sleeved on the outer side of the first feeding piece 11, and the first feeding piece 11 is connected to the first feeding seat 12 by rotation. A first high-pressure air chamber 13 is arranged between the first feeding seat 12 and the first feeding piece 11, and a second air inlet channel 14 for inputting high-pressure gas into the first high-pressure air chamber 13 is arranged on the first feeding seat 12. A first installation gap is arranged between the first high-pressure air chamber 13 and the first accommodating chamber, and the high-pressure gas enters the first high-pressure air chamber 13 through the second air inlet channel 14, and the high-pressure gas in the first high-pressure air chamber 13 enters the first accommodating chamber through the first installation gap, compresses the core fiber bundle in the first accommodating chamber, and the compressed core fiber bundle is output backward along the axial direction of the first feeding seat 12. Furthermore, in order to better compress the core filament bundle, a regulating valve is provided on the second air inlet passage, and the flow rate of the high-pressure gas is adjusted by the regulating valve.

[0079] Specifically, the first installation gap is arranged between the first feed piece 11 and the first feed seat 12, the first feed seat 12 is coaxially mounted on the outside of the first feed piece 11, the first installation gap is arranged at the outlet end of the first feed piece 11, and the first high-pressure air cavity 13 and the first accommodating cavity are connected through the first installation gap. The high-pressure air in the first high-pressure air cavity 13 passes through the first installation gap, and compresses the core fiber bundle in the axial direction of the first accommodating cavity, and the compression effect is better.

[0080] Furthermore, the first feed piece 11 is provided with a third feed section 111, an air intake section 112, an air distribution section 113 and a ventilation section 114, wherein the third feed section 111, the air intake section 112, the air distribution section 113 and the ventilation section 114 are arranged in sequence along the conveying direction of the core body, and the third feed section 111 is used for feeding the core body tow. To facilitate feeding, the cross-sectional size of the third feed section 111 gradually shrinks toward the direction of the air intake section 112. The third feed section 111 has a large opening and a small outlet, which is more convenient for feeding; the air intake section 112 is connected to the second air intake channel 14, and the first installation gap is arranged between the ventilation section 114 and the first feed seat 12. The air distribution channel for high-pressure gas to pass through is arranged on the air distribution section 113. The high-pressure gas input through the second air intake channel 14 enters the first accommodating chamber through the air distribution channel and the first installation gap, and axially compresses the core body tow in the first accommodating chamber.

[0081] Further, the first installation gap is used to connect the first high-pressure air chamber 13 and the first accommodating chamber. By adjusting the size of the first installation gap, the size of the pressure of the high-pressure air entering the first accommodating chamber can be adjusted. As one embodiment, the first molding device in the embodiment of the present invention also includes a fastener 15, the fastener 15 is fixedly arranged at one end of the first feed seat 12, and the fastener 15 is sleeved on the outside of the first feed member 11. The fastener 15 and the first feed member 11 are connected by threads. The cross-sectional size of the ventilation section 114 gradually increases in the direction of the distribution section 113, and the first feed member 11 is rotated to adjust the first installation gap. When the first feed member 11 is rotated, the ventilation section 114 moves in the direction of the air intake section 112, and the first installation gap between the ventilation section 114 and the first feed seat 12 increases.

[0082] Furthermore, a first discharge chamber 121 is provided in the first feed seat 12. The first discharge chamber 121 is provided at one end of the first feed seat 12 away from the third feed section 111, and the first discharge chamber 121 is used to output the compressed core filament bundle. The cross-sectional size of the first discharge chamber 121 gradually increases in the direction away from the third feed section 111, and the first discharge chamber 121 has a large inlet and a small outlet, which is more convenient for discharge.

[0083] Furthermore, a second air cavity 122 is provided in the first feed seat 12 for use with the ventilation section 114, wherein the second air cavity 122 is connected to the first discharge cavity 121, and the cross-sectional size of the second air cavity 122 gradually increases in the direction away from the first discharge cavity 121. When the first feed member 11 is installed in the first feed seat 12, the outer surface of the ventilation section 114 abuts against the second air cavity 122, and at this time, the first installation gap is zero. The first feed member 11 is rotated to drive the first feed member 11 to move in the direction away from the first discharge cavity 121, and the inclination angle of the second air cavity 122 is greater than the inclination angle of the ventilation section 114, and the first installation gap increases, so that the high-pressure air in the first high-pressure air cavity 13 enters the first accommodating cavity through the first installation gap, and the core tow is axially compressed.

[0084] More specifically, the air distribution section 113 is provided with fixed blocks at intervals in the circumference, and an air distribution channel is provided between adjacent fixed blocks. A third air cavity 123 used in conjunction with the fixed blocks is provided in the first feed seat 12, and the inner wall of the third air cavity 123 abuts against the outer surface of the fixed block to position the fixed block. When the first feed member 11 is rotated, the fixed block moves axially along the inner wall of the third air cavity 123. High-pressure air enters the air intake section 112 through the second air intake channel 14, and the high-pressure gas in the air intake section 112 enters the first accommodating cavity through the air distribution channel and the first installation gap.

[0085] Furthermore, the first feed seat 12 is also provided with a fourth air cavity 124 , wherein the fourth air cavity 124 is sleeved on the outer side of the air intake section 112 , the second air intake channel 14 is provided on the first feed seat 12 , and the second air intake channel 14 is connected to the fourth air cavity 124 .

[0086] In the above structure, in order to prevent the first high-pressure air chamber 13 from leaking before entering the first accommodating chamber, a fourth seal 16 is provided between the first feed seat 12 and the first feed piece 11, wherein the fourth seal 16 is provided between the air intake section 112 and the third feed section 111, and an installation groove 115 for installing the fourth seal 16 is provided on the outer surface of the first feed piece 11.

[0087] In the above structure, as one of the embodiments, the first molding mechanism in the embodiment of the present invention also includes a first molding part 20 and a first steam supply device, wherein the first molding part 20 is coaxially arranged with the first discharge cavity 121, and a first molding cavity 21 is arranged in the first molding part 20, and the first molding cavity 21 is used to receive the compressed core filament bundle output by the first discharge cavity 121, and solidify and mold the core filament bundle in the first molding cavity 21, and the first steam supply device is used to input high-temperature steam into the first molding cavity 21, so that the core filament bundle in the first molding cavity 21 is quickly solidified and molded into a core, wherein the high-temperature steam is specifically high-temperature saturated steam with a temperature between 110°C and 130°C, and the high-temperature saturated steam can be pre-dried before entering the first molding cavity, and the dryness of the high-temperature saturated steam is greater than 95%.

[0088] Furthermore, a second feed section is provided at one end of the first molding cavity 21 close to the first feed seat 12, and the cross-sectional size of the second feed section gradually decreases toward the end away from the first feed seat 12. The second feed section has a large opening and a small outlet, which makes it easier for the core filament bundle output from the first feed seat 12 to enter the first molding cavity 21.

[0089] Furthermore, the first steam supply device includes a first molding seat 22, a first air inlet channel 24 and an exhaust channel group 25, wherein the first molding seat 22 is coaxially sleeved on the outer side of the first molding member 20, and the first molding seat 22 is fixedly connected to the support frame 60, a first high-temperature air cavity 23 is arranged between the first molding seat 22 and the first molding member 20, the first air inlet channel 24 is arranged on the first molding seat 22, and high-temperature steam is input into the first high-temperature air cavity 23 through the first air inlet channel 24, and a connection between the first high-temperature air cavity 23 and the first molding cavity 21 is arranged on the first molding member 20, the high-temperature steam enters the first high-temperature air cavity 23 through the first air inlet channel 24, the high-temperature steam in the first high-temperature air cavity 23 enters the first molding cavity 21 through the exhaust channel group 25, and the core filament bundle in the first molding cavity 21 is quickly solidified and formed into a core under the action of the high-temperature steam.

[0090] Furthermore, the outer surface of the first molded part 20 is provided with a first inwardly concave annular cavity, and a first high-temperature air cavity 23 is formed between the first annular cavity and the inner wall of the first molding seat 22. In order to enable the high-temperature steam in the first high-temperature air cavity 23 to evenly enter the first molding cavity 21, more specifically, the exhaust channel group 25 includes at least two exhaust pipes, and the exhaust pipes are arranged to be inclined downward, and the outlets of the exhaust pipes in the same exhaust pipe group are evenly spaced around the circumference of the second feed section.

[0091] Furthermore, in the embodiment of the present invention, at least two exhaust channel groups 25 are provided, and the exhaust channel groups 25 are arranged at intervals along the axial direction of the second feeding section. By providing at least two exhaust channel groups 25, the high-temperature steam in the first high-temperature air cavity 23 can enter the first molding cavity 21. By providing at least two exhaust channel groups 25, the core tow is cured and molded by the high-temperature steam output by the multiple exhaust channel groups 25 during the transportation process in the first molding cavity 21, so that the molding effect is better and the molding efficiency is higher.

[0092] Furthermore, the first steam supply device in the embodiment of the present invention further includes a first seal 26 and a second seal 27, wherein the first seal 26 and the second seal 27 are both disposed between the first molded part 20 and the first molded seat 22, and the first seal 26 and the second seal 27 are respectively disposed on both sides of the first high-temperature air cavity 23, so that the first high-temperature air cavity 23 forms a sealed cavity 72. Due to the provision of the first seal 26 and the second seal 27, the first molded seat 22 is sealedly connected to the first molded part 20, thereby preventing the high-temperature steam in the first high-temperature air cavity 23 from leaking before entering the first molded cavity 21.

[0093] In the above structure, the first sealing member 26 and the second sealing member 27 in the embodiment of the present invention are both sealing rings.

[0094] In the above structure, in order to further ensure the sealing effect, at least two first sealing members 26 and at least two second sealing members 27 are provided in the embodiment of the present invention.

[0095] Furthermore, as one embodiment, the first steam supply device in the embodiment of the present invention further includes a heat dissipation channel 28, wherein the heat dissipation channel 28 is arranged at one end of the first high-temperature air cavity 23 away from the first feed seat 12, and the heat dissipation channel 28 is arranged on the side of the first seal 26 away from the second seal 27, wherein the second seal 27 and the first seal 26 are arranged in sequence along the direction of core conveyance. The gas after the core is formed can be discharged through the first forming cavity 21, and the heat dissipation channel 28 can be used for exhaust and auxiliary heat dissipation.

[0096] In the above method, as one embodiment, the cross-sectional shape of the first molding cavity 21 is the same as the cross-sectional shape of the guide rod 30, and the cross-sectional shape of the first molding cavity is specifically any one of the Yellow Crane Tower pattern, the Yellow Crane pattern, the lightning pattern, the letter pattern or the number pattern. Specifically, the guide rod 30 with different cross-sectional shapes of the molding cavity 36 cooperates with the second molding cavity 50 to form a hollow filter with different hollow shapes.

[0097] In the above structure, as one of the embodiments, the guide rod 30 in the embodiment of the present invention includes a first feed section 32, a first shaping section 33 and a second shaping section 34 connected in sequence, the first feed section 32, the first shaping section 33 and the second shaping section 34 are coaxially arranged, the second feed member 41 is sleeved on the outside of the first shaping section 33, the second molding cavity 50 is arranged on the outside of the second shaping section 34, the core body enters the second shaping section 34 from the first feed section 32 through the first molding section 33, the second molding section is provided with an opening 31, the side body in the second molding cavity 50 is connected with the core body in the second shaping section 34 through the opening 31, and in order to facilitate the feeding of the side body, the cross-sectional size of the first feed section 32 is gradually reduced toward the direction of the second molding section. Specifically, the second feed section 52 in the embodiment of the present invention is a conical structure.

[0098] In the above structure, as one of the implementation modes, the first feeding section 32, the first shaping section 33 and the second shaping section 34 in the embodiment of the present invention are specifically an integrated structure.

[0099] In the above structure, as one of the embodiments, the guide rod 30 in the embodiment of the present invention also includes a fixed seat 35, wherein the fixed seat 35 is installed on the support frame 60, and the guide rod 30 is supported by the fixed seat 35, so that the molding cavity 36 in the guide rod 30 is coaxially arranged with the first molding device, wherein the fixed seat 35 is arranged below the first feed section 32, and the first feed section 32 is supported by the fixed seat 35, and a flat surface 321 is provided at the bottom of the first feed section 32 for use with the top surface of the fixed seat 35, and the first feed section 32 is fixed to the fixed seat 35 by the flat surface 321, so that the axis of the guide rod 30 is parallel to the fixed seat 35, so that the core body enters the guide rod 30 from the first feed section 32, and enters the second molding section 34 from the first molding section 33.

[0100] The openings 31 in the embodiment of the present invention are arranged at the outlet end of the second shaping section, and at least two groups of openings are arranged, and the openings 31 are evenly spaced around the circumference of the guide rod 30. The openings 31 are used to make the core body in the shaping cavity 36 contact with the side body tow in the second shaping cavity 50, and the side body tow in the second shaping cavity 50 and the core body are solidified to form a hollow filter, and the side body and the core body are connected through the openings 31. If there are too few connection points between the side body and the core body, the core body and the side body are easy to fall off, and if there are too many connection points between the side body and the core body, the hollow shape display effect between the core body and the side body is not good.

[0101] Furthermore, in the embodiment of the present invention, two to four openings 31 are provided, and the openings 31 are evenly spaced around the circumference of the guide rod 30. This can prevent the side body and the core body from being deformed and delaminated after the hollow filter tip is formed, and the core body from falling off from the side body.

[0102] In the above structure, as one of the implementation modes, the width of the opening 31 in the embodiment of the present invention is preferably 0.5 mm to 1 mm. Under the premise of not affecting the aesthetics of the hollow filter, the width of the opening 31 can be increased as much as possible.

[0103] In the above structure, the first molding device in the embodiment of the present invention is used for molding the core body and conveying the molded core body into the guide rod 30, and the second molding device is sleeved on the outside of the guide rod 30, and the second molding device is used for molding the side body, and the side body tow contacts the core body through the opening 31 and is thermoformed by the second molding device. The structure of the second molding device is roughly the same as that of the first molding device, and only the differences between the second molding device and the first molding device are further described below, and the similarities between the two are not further described.

[0104] In the above structure, the second molding device in the embodiment of the present invention includes a second feed piece 41, a second feed seat 42, a fourth air inlet channel 44 and a second installation gap, wherein the second feed piece 41 is coaxially sleeved on the outer side of the first molding section 33, a second accommodating chamber for accommodating the edge body is arranged between the second feed piece 41 and the guide rod 30, the second feed seat 42 is rotatably arranged on the outer side of the second feed piece 41, a second high-pressure air cavity 43 is arranged between the second feed seat 42 and the second feed piece 41, the fourth air inlet channel 44 is arranged on the second feed seat 42, and high-pressure gas is input into the second high-pressure air cavity 43 through the fourth air inlet channel 44, and the second installation gap is arranged between the second feed seat 42 and the second feed piece 41, for connecting the second accommodating chamber with the second high-pressure air cavity 43.

[0105] Furthermore, the second molding device further includes a second molding member 51 and a second steam supply device, wherein the second molding member 51 is coaxially sleeved on the outside of the second molding section 4, the second molding cavity 50 is arranged between the second molding member 51 and the guide rod 30, and is used to receive the side body filament bundle output by the second accommodating cavity, and the second steam supply device is used to input high-temperature steam into the second molding cavity 50, so that the side body filament bundle in the second molding cavity 50 and the core body in the molding cavity 36 are quickly solidified and molded through the opening 31. The high-temperature steam is specifically high-temperature saturated steam with a temperature between 110°C and 130°C, and the high-temperature saturated steam can be dried in advance before entering the second molding cavity, and the dryness of the high-temperature saturated steam is greater than 95%.

[0106] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hollow filter tip forming method, characterized in that: The following steps are involved: S1, pre-treating the core tow and the side tow; S2, injecting the pre-treated core tow into the first forming device, forming the core tow into a core by the first forming device and outputting the core; S3, the pre-treated side body tow is injected into a second molding device, the core body is input into a molding cavity (36) of a guide rod (30), and the core body and the side body tow are integrally molded into a hollow filter tip by the second molding device and output; The second forming device is coaxially sleeved on the outside of the guide rod (30), and an opening groove (31) connecting the forming cavity (36) and the second forming device is provided in the circumference of the outlet end of the guide rod (30), so that the core body and the edge body tow are in contact and integrally formed into a hollow filter.

2. The hollow filter tip forming method according to claim 1, characterized in that: After step S3, the method further includes the following steps: S4, conveying the hollow filter tip into a shaping device (70), and cooling and shaping the hollow filter tip by the shaping device (70).

3. The hollow filter tip forming method according to claim 2, characterized in that: The shaping device (70) comprises: A shaping piece (71), wherein a cavity (72) for receiving the hollow filter tip is provided in the shaping piece (71); A shaping seat (73) sleeved on the outer side of the shaping member (71) and sealedly connected to the shaping member (71); A cooling channel (74) is arranged on the shaping seat (73) and is in communication with the cavity (72) and is used to input dry cold air into the cavity (72), wherein the temperature of the dry cold air is 5°C-10°C.

4. The hollow filter tip forming method according to claim 3, characterized in that: At least two groups of the shaping devices (70) are provided, and the shaping devices (70) are arranged at intervals along the conveying direction of the hollow filter tip.

5. The hollow filter tip forming method according to claim 1, characterized in that: The step S1 includes the following steps: Opening the core tow and conveying it to the first forming device; The edge body tow is opened and transported between the second forming device and the guide rod (30).

6. The hollow filter tip forming method according to claim 1, characterized in that: In step S2, the core tow is formed into a core by a first forming device and outputted, comprising the following steps: Inputting the core tow into a first feeding mechanism to compress the core tow; The compressed core body tow is input into the first forming mechanism and is thermoformed into a core body.

7. The hollow filter tip forming method according to claim 6, characterized in that: The first feeding mechanism comprises: A first feeding piece (11), wherein a first accommodating cavity for accommodating a core yarn bundle is provided in the first feeding piece (11); a first feed seat (12) sleeved on the outer side of the first feed member (11) and rotatably connected to the first feed member (11), wherein a first high-pressure air chamber (13) is provided between the first feed seat (12) and the first feed member (11); A second air inlet passage (14) disposed on the first feed seat (12) and used for inputting high-pressure gas into the first high-pressure gas chamber (13); A first installation gap is provided between the first feed seat (12) and the first feed member (11) and is used to connect the first accommodating cavity and the first high-pressure gas cavity (13); The second air inlet passage (14) is provided with a regulating valve for adjusting the flow rate of the compressed gas.

8. The hollow filter tip forming method according to claim 7, characterized in that: The first feeding mechanism further comprises: A fastener (15) is fixedly arranged at one end of the first feed seat (12), the fastener (15) is sleeved on the outside of the first feed member (11), and the fastener (15) and the first feed member (11) are connected via a thread, and the first feed member (11) is rotated to adjust the first installation gap.

9. The hollow filter tip forming method according to claim 8, characterized in that: The first forming mechanism further includes: a first molded part (20) arranged coaxially with the first accommodating cavity, wherein a first molding cavity (21) is arranged in the first molded part (20); A first steam supply device for inputting high-temperature steam into the first molding cavity (21) so as to solidify and mold the core filament bundle in the first molding cavity (21); The temperature of the high-temperature steam is 110°C to 130°C.

10. The hollow filter tip forming method according to claim 9, characterized in that: The cross-sectional shape of the first molding cavity (21) is the same as the cross-sectional shape of the guide rod (30), and the cross-sectional shape of the first molding cavity (21) is specifically any one of a Yellow Crane Tower pattern, a yellow crane pattern, a lightning pattern, a letter pattern or a number pattern.

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