Paper tape sizing device and sizing method

Abstract

The invention provides a paper tape sizing device and a sizing method, belongs to the technical field of sizing, and is used for solving the problems of reverse osmosis caused by non-uniform sizing of forming paper of an existing filter stick forming machine, leakage of glue from a nozzle and non-uniform glue lines. The paper tape sizing device comprises a nozzle and a transfer roller, a nozzle outlet of the nozzle is a rectangular outlet, the transfer roller is arranged between the nozzle and a paper tape, and the transfer roller rotates to accelerate glue sprayed out of the nozzle outlet of the nozzle to a preset speed and then transfer the glue to the moving paper tape. The gluing uniformity can be improved, glue leakage is reduced, and the glue reverse osmosis phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gluing, and in particular to a paper tape gluing device and a gluing method. Background Art

[0002] In the production process of cigarette filter rods, the packaging paper tape is wrapped around the filter material to form an infinitely long filter rod, which is then cut into filter rods of a set length. During this production process, the edges of the paper tape need glue lines to bond the overlaps; and the middle of the paper tape also needs glue to bond the filter element and the paper tape to prevent the two from slipping and misaligning.

[0003] In the prior art, when applying glue to the packaging paper tape, filter rod forming machines mostly use a nozzle with a circular outlet to apply glue directly to the paper tape. Since the flow rate of the glue extruded from the nozzle is not uniform at each position, the state of each glue particle is different during the process of transferring the glue from the nozzle to the paper tape, making it difficult to achieve the motion balance of all glue particles, and it is impossible to transfer the glue to the paper tape without leakage and take it all away; due to the uneven flow characteristics and flow distribution of the glue, this will lead to uneven glue distribution on the glue line, and reverse osmosis will occur in places where there is too much glue on the high-transparency forming paper, and the adhesive force will be low in places where there is insufficient glue. In addition, the paper tape of this gluing method contacts the nozzle and forms a certain pressure, which can easily cause wear to the nozzle, thereby aggravating the glue leakage and affecting the gluing quality. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a paper tape gluing device and a gluing method for solving the problems of uneven gluing of the forming paper of the existing filter rod forming machine, glue leakage from the nozzle, and reverse osmosis caused by uneven glue lines.

[0005] The present disclosure provides a paper tape glue application device, comprising a nozzle, wherein the nozzle outlet of the nozzle is a rectangular outlet, and the glue application device further comprises: The transfer roller is arranged between the nozzle and the paper tape. The transfer roller accelerates the glue sprayed from the nozzle outlet to a predetermined speed through rotation and then transfers it to the moving paper tape.

[0006] In some embodiments, the nozzle includes a nozzle body and a telescopic body; the telescopic body is located inside the nozzle body, and the telescopic body can be controlled to approach or move away from the nozzle outlet; when the distance between the front end of the telescopic body and the nozzle outlet is greater than a predetermined distance, a glue channel is formed between the telescopic body and the inner wall of the nozzle body, and when the distance between the front end of the telescopic body and the nozzle outlet is equal to the predetermined distance, the front end of the telescopic body is close to the inner wall of the nozzle body, and the glue channel is closed.

[0007] In some embodiments, the nozzle includes a plurality of nozzle outlets of the same or different sizes, the plurality of nozzle outlets are arranged in parallel along the axial direction of the transfer roller, and the plurality of nozzle outlets share a glue channel.

[0008] In some embodiments, a heating device is provided inside the nozzle body and around the glue channel.

[0009] In some embodiments, the heating device is a heating ring.

[0010] In some embodiments, the glue application device further includes: a heating plate disposed on one side of the transfer roller; the transfer roller and the heating plate are respectively located on both sides of the paper tape.

[0011] In some embodiments, when the transfer roller rotates, the direction of the linear velocity of the position closest to the paper tape is opposite to the moving direction of the paper tape.

[0012] In some embodiments, the gap between the end surface of the nozzle outlet and the transfer roller is 0.03 mm to 0.10 mm.

[0013] In some embodiments, the surface of the transfer roller for transferring the glue is a smooth surface.

[0014] The present disclosure also provides a paper tape gluing method, which is used in the paper tape gluing device provided in the present disclosure, and the method includes the following steps: Spray glue through a nozzle; The glue sprayed from the nozzle is accelerated to a predetermined speed by a rotating transfer roller and then transferred to the moving paper tape; The method also includes: a step of heating the glue during the gluing process.

[0015] In some embodiments, the step of heating the glue during the gluing process includes: heating the glue flowing through the inside of the nozzle; and / or The transfer roller is heated so that the glue on the transfer roller is indirectly heated.

[0016] The paper tape gluing device provided by the present invention accelerates the glue at the rectangular nozzle outlet to a predetermined speed through a transfer roller and then transfers it to the moving paper tape. During the process of the glue from the nozzle to the paper tape, since the positions of the nozzle and the transfer roller are relatively fixed, the glue can maintain a specific thickness of glue film on the transfer roller, and the width can also be kept uniform. When the transfer roller transfers to the paper tape, the glue speed at each position is the same, and the state of each glue particle is the same, which can achieve the motion balance of all glue particles, so that the glue is transferred to the paper tape without leakage. In addition, since the flow characteristics and flow rate of the glue transferred from the transfer roller to the paper tape are uniform, the glue thickness is uniform and will not cause glue reverse osmosis. In addition, since the nozzle outlet is rectangular and has a certain aspect ratio, when the glue is extruded from the nozzle, the width and thickness of the glue line can be well maintained, thereby improving the gluing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a paper tape gluing device provided by an embodiment of the present invention; Figure 2 A front cross-sectional view of a paper tape gluing device provided by an embodiment of the present invention; Figure 3 A schematic diagram of a nozzle structure provided by an embodiment of the present invention; Reference numerals: 1. Paper tape; 2. Transfer roller; 3. Nozzle; 4. Heating device; 5. Heating plate; 11. Glue line; 21. Glue film; 31. Nozzle outlet; 32. Glue channel; 33. Telescopic body; 34. Nozzle body; A. Rotation direction of transfer roller; B. Movement direction of paper tape. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Figure 1 The schematic diagram of the structure of a paper tape gluing device provided by an embodiment of the present invention comprises a transfer roller 2 and a nozzle 3, wherein the nozzle outlet 31 of the nozzle 3 is a rectangular outlet, the transfer roller 2 is arranged between the nozzle 3 and the paper tape 1 to be glued, and the transfer roller 2 rotates around its own axis as shown in FIG. Figure 1The glue sprayed from the nozzle outlet 31 of the nozzle 3 is accelerated to a predetermined speed and then transferred to the paper tape 1 moving along the direction A. Figure 1 As shown in the figure, in the gluing device proposed by the present invention, the glue squeezed out of the nozzle 3 is transported to the moving paper belt through the transfer roller 2, and the moving paper belt 1 continuously takes away the glue transported by the transfer roller 2, forming a glue line 11 on the paper belt.

[0021] When the glue is on the transfer roller 2, due to the surface tension, the edges of the glue line will gather in the middle, forming a glue line that is thick in the middle and thin at the edges, which can easily cause the problem of poor glue uniformity. In order to solve this problem, the nozzle outlet 31 of the glue application device provided by the present invention is set as a rectangular outlet and has a certain aspect ratio, for example, the aspect ratio is between 2 and 5, so that when the glue is sprayed from the nozzle, the length and width of its cross section can be well maintained, that is, the width and thickness of the glue line are guaranteed.

[0022] Figure 2 A front cross-sectional view of a paper tape gluing device provided by an embodiment of the present invention, as shown in FIG. Figure 2 As shown in , the nozzle 3 includes a nozzle body 34 and a telescopic body 33; the nozzle body 34 is hollow inside, the telescopic body 33 is located inside the nozzle body 34, and the telescopic body 33 can be controlled to approach or move away from the nozzle outlet 31; Figure 2 As shown in FIG. 1 , when the distance between the front end of the telescopic body 33 and the nozzle outlet 31 is greater than a predetermined distance, a glue channel 32 is formed between the telescopic body 33 and the inner side wall of the nozzle body 34. Figure 2 The shape of the telescopic body 33 (left side) matches the internal shape of the nozzle body 34. When the distance between the front end of the telescopic body 33 and the nozzle outlet 31 is equal to the predetermined distance, the front end of the telescopic body 33 is in close contact with the inner wall of the nozzle body 34. The two are combined into one, blocking the nozzle outlet 31, and the glue channel 32 is closed, thereby quickly shutting off the glue supply. Therefore, the opening and closing of the glue channel can be realized by controlling the position of the telescopic body 33 relative to the nozzle body 34, and the cross-sectional size of the water regulating channel can also be adjusted to adjust the glue flow.

[0023] Preferably, if Figure 2 As shown in FIG. 1 , the axis of the transfer roller 2 is horizontally aligned with the center of the nozzle outlet 31 of the nozzle 3 (is at the same level).

[0024] Preferably, the nozzle 3 can be provided with one or more nozzle outlets 31 according to actual needs. Figure 3 A schematic diagram of a nozzle structure provided by an embodiment of the present invention, such as Figure 3As shown in FIG. 1 , the nozzle 3 includes a plurality of nozzle outlets 31. The sizes (B1, B2, ...; t1, t2, ...) of the plurality of nozzle outlets 31 may be the same or different. The plurality of nozzle outlets 31 are arranged in parallel along the axial direction of the transfer roller 2 and maintain a gap δ consistent with the transfer roller 2, thereby forming a transfer roller 2 as shown in FIG. Figure 1 The multiple glue films 21 shown in FIG. Preferably, multiple nozzle outlets 31 can share one glue channel 32 .

[0025] In some optional embodiments, such as Figure 2 As shown, the gap δ between the end face of the nozzle outlet 31 and the transfer roller 2 can be 0.03mm to 0.10mm, so that when the glue is transferred from the nozzle 3 to the transfer roller 2, the glue can maintain a specific thickness of the glue film 21 on the transfer roller 2 through the extrusion deformation of the gap, and the width can also be kept uniform. By controlling the gap between the end face of the nozzle outlet 31 and the transfer roller 2, the glue will immediately contact the transfer roller 2 after being squeezed out from the nozzle outlet 31 and will be transferred therewith, which can avoid the accumulation of glue between the nozzle 3 and the transfer roller 2 before the glue is applied, so that the glue can be quickly applied to the paper tape 1, and the glue application reaction time can be accelerated.

[0026] In the embodiment of the present invention, when the transfer roller 2 rotates, the linear velocity direction of the position closest to the paper tape 1 is opposite to the moving direction of the paper tape. Figure 1 As shown in , the rotation direction A of the transfer roller 2 is opposite to the movement direction B of the paper tape. After the glue comes out of the nozzle 3, it contacts the transfer roller 2 and is transported to the paper tape 1 in the reverse direction and continuously. Since the glue has a certain viscosity and is difficult to flow, it contacts the transfer roller 2 after coming out of the nozzle 3. At this time, the transfer roller 2 rotates to transport the glue in the reverse direction toward the paper tape 1, which is equivalent to an automatic slope, allowing the glue to be continuously transferred to the position of the paper tape 1, and the paper tape 1 moves continuously, forming a continuous glue line 11 through the smearing action.

[0027] Preferably, the diameter of the transfer roller 2 can be 8 mm to 20 mm, and the transfer roller 2 can be driven to rotate, and its rotation speed matches the speed of the paper tape 1. The faster the speed of the paper tape 1, the faster the rotation speed of the transfer roller 2. Preferably, the rotation speed is 1000 to 10000 rpm. The advantage of this is that the thickness of the glue film finally formed by the glue on the paper tape can remain unchanged and has high uniformity.

[0028] In a conventional coating device, the outer circumferential surface of the coating roller is generally provided with regularly distributed grids or recessed rings / ribs, so that the coating can be accommodated through the recessed position. However, if such a coating roller is used for gluing the forming paper of the forming machine, the gap between the coating roller surface and the nozzle will increase, so that the glue cannot be successfully applied from the nozzle to the roller; in addition, there will be a problem that the glue gathers at the bottom of the recess and dries, which is difficult to clean. Preferably, the surface (working surface) of the transfer roller 2 used to transfer the glue is a smooth surface. The working surface of the transfer roller 2, that is, the contact surface with the paper tape 1, is a smooth surface, so that the paper tape 1 and the transfer roller 2 can fit better when in contact. The process of applying glue from the transfer roller 2 to the paper tape 1 is a wiping process. During this process, the surface of the transfer roller 2 maintains a certain degree of smoothness, which can make the transfer process smoother. There is almost no residual glue on the surface of the transfer roller 2 wiped by the paper tape 1, and the roller surface is self-cleaning.

[0029] Most importantly, the glue application device provided by the present invention needs to control the temperature of the glue, especially when latex is used for glue application, the glue temperature is controlled to solve the glue splashing problem caused by the excessive speed of the paper tape. The temperature control scheme in this embodiment is to heat the glue. Without affecting the bonding performance of the glue, the glue is heated to a temperature slightly higher than the room temperature, such as 35°C, 40°C, etc. In this way, after the temperature of the glue is increased, the thermal motion of its internal molecules is intensified, the surface tension is reduced, and the viscosity is reduced at the same time. This can promote the balance of shear force, centrifugal force, surface tension and other forces when the glue is transferred from the transfer roller 2 to the paper tape, avoid glue splashing caused by the excessive speed of the paper tape, and improve the quality of gluing.

[0030] In some embodiments, a heating device 4 is disposed inside the nozzle body 34 and around the glue channel 32. The heating device 4 may be a heating rod or a heating plate, or a heating ring; preferably, a heating ring is disposed around the glue channel 32 so that the glue can be heated evenly. In addition, the transfer roller 2 may be heated selectively or simultaneously, such as Figure 1 As shown in FIG. 1 , a heating plate 5 is arranged beside the transfer roller 2. The transfer roller 2 and the heating plate 5 are respectively located at two sides of the paper tape 1, so that the transfer roller 2 can be kept at a relatively high temperature.

[0031] The glue application device provided by the present invention can also be applied to hot melt glue application. It only needs to control the glue temperature to the temperature required for hot melt glue application and heat the transfer roller 2 in the same way, so that the hot melt glue can be extruded from the nozzle 3 and then applied to the paper tape 1 through the roller. The glue application device provided by the present invention is suitable for latex (cold glue) gluing when the heating temperature is slightly higher than the normal temperature; it can be applied to hot melt glue (hot glue) gluing when the heating temperature is higher.

[0032] The embodiment of the present invention further provides a paper tape gluing method, which is used in the paper tape gluing device provided by the present invention. The method comprises the following steps: Step 1: Spray glue through the nozzle; Step 2: The glue sprayed from the nozzle is accelerated to a predetermined speed by a rotating transfer roller and then transferred to the moving paper tape; Importantly, the method provided by the present invention includes a step of heating the glue during the gluing process.

[0033] Preferably, the step of heating the glue during the gluing process includes: heating the glue flowing through the inside of the nozzle; and / or heating the transfer roller so that the glue on the transfer roller is indirectly heated.

[0034] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A paper tape gluing device, comprising a nozzle (3), characterized in that: The nozzle outlet (31) of the nozzle (3) is a rectangular outlet, and the glue application device further comprises: The transfer roller (2) is arranged between the nozzle (3) and the paper tape (1), and the transfer roller (2) accelerates the glue sprayed from the nozzle outlet (31) to a predetermined speed by rotating, and then transfers the glue to the moving paper tape (1).

2. The paper tape gluing device according to claim 1, characterized in that: The nozzle (3) comprises a nozzle body (34) and a telescopic body (33); the telescopic body (33) is located inside the nozzle body (34), and the telescopic body (33) can be controlled to approach or move away from the nozzle outlet (31); when the distance between the front end of the telescopic body (33) and the nozzle outlet (31) is greater than a predetermined distance, a glue channel (32) is formed between the telescopic body (33) and the inner side wall of the nozzle body (34); and when the distance between the front end of the telescopic body (33) and the nozzle outlet (31) is equal to the predetermined distance, the front end of the telescopic body (33) is tightly attached to the inner side wall of the nozzle body (34), and the glue channel (32) is closed.

3. The paper tape gluing device according to claim 2, characterized in that: The nozzle (3) comprises a plurality of nozzle outlets (31) of the same or different sizes, the plurality of nozzle outlets (31) being arranged in parallel along the axial direction of the transfer roller (2), and the plurality of nozzle outlets (31) sharing a glue channel (32).

4. The paper tape gluing device according to claim 2, characterized in that: A heating device (4) is provided inside the nozzle body (34) and around the glue channel (32).

5. The paper tape gluing device according to claim 4, characterized in that: The heating device (4) is a heating ring.

6. The paper tape gluing device according to claim 1, characterized in that: The glue application device further comprises: a heating plate (5) arranged on one side of the transfer roller (2); the transfer roller (2) and the heating plate (5) are respectively located on both sides of the paper tape (1).

7. The paper tape gluing device according to claim 1, characterized in that: When the transfer roller (2) rotates, the direction of its linear speed at the position closest to the paper tape (1) is opposite to the moving direction of the paper tape.

8. The paper tape gluing device according to claim 1, characterized in that: The surface of the transfer roller (2) used to transfer the glue is a smooth surface.

9. A method for gluing a paper tape, used in the paper tape gluing device according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Spray glue through a nozzle; The glue sprayed from the nozzle is accelerated to a predetermined speed by a rotating transfer roller and then transferred to the moving paper tape; The method also includes: a step of heating the glue during the gluing process.

10. The paper tape sizing method according to claim 9, characterized in that: The step of heating the glue during the gluing process comprises: heating the glue flowing through the inside of the nozzle; and / or The transfer roller is heated so that the glue on the transfer roller is indirectly heated.

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