A dryer for producing base paper

Abstract

The utility model belongs to the raw paper drying technical field especially relates to a drying cylinder for raw paper production, include: cylinder body, the inner chamber fixed setting of cylinder body has multiple groups heat bar, the heat bar is evenly distributed in the inner side wall of cylinder body in spiral shape, one end of heat bar is provided with pointed roof, the outer side wall both ends of cylinder body are provided with spiral groove respectively, the spiral direction of two groups spiral groove is opposite, the inner chamber fixed setting of spiral groove has spiral strip, the side wall fixed connection of heat bar has heat conduction rod, heat conduction rod penetrates the inner chamber of cylinder body, and with spiral groove fixed setting, wherein, through the heat bar of spiral setting guide condensate to one end of cylinder body, the heat conduction to cylinder body and heat conduction rod, compared with prior art, the utility model reduces the accumulation of condensate, promotes drying heat efficiency, utilizes the even reverse flattening force that the reverse spiral formed when drying cylinder operation, can relax the wrinkle that raw paper transportation process produced, improved the work efficiency of drying cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of paper drying technology, and in particular relates to a drying cylinder for paper production. Background Technology

[0002] As a core material in the paper products industry chain, base paper is widely used in food packaging, tobacco tipping paper, printing paper for books and periodicals, and substrates for hygiene products. Its physical properties (such as dryness, smoothness, and tensile strength) directly determine the quality grade of downstream products. In the base paper production process, the drying cylinder is a key piece of equipment for achieving moisture control and performance improvement. By heating the base paper with steam inside the cylinder, the moisture content of the base paper is reduced. At the same time, the hot pressing effect improves the fiber bonding and enhances the stiffness and surface smoothness of the paper. Therefore, the operating efficiency and stability of the drying cylinder are crucial to the capacity and yield of the base paper production line.

[0003] Currently, the industry has conducted multiple rounds of optimization on the structure of drying cylinders. For example, the "Cigarette Tipping Paper Base Paper Drying Cylinder Equipment" disclosed in Chinese Patent Publication No. 202323118106.5, by setting a transverse guide hood inside the cylinder and cooperating with a steam component extending along the central axis, achieves directional steam delivery within the cylinder, effectively improving heat conduction uniformity and providing a fundamental guarantee for the production of base papers such as cigarette tipping paper, which are highly sensitive to temperature. However, in actual industrial applications, this type of equipment and existing mainstream drying cylinders still have two major technical pain points that restrict the efficiency and quality of base paper production: Firstly, the condensate retention leads to issues with thermal efficiency and quality. After heat exchange within the cylinder, steam condenses into liquid water. Existing drying cylinders mostly rely on the centrifugal force of cylinder rotation for natural drainage. However, in actual production, condensate easily forms an irregular accumulation layer at the bottom of the cylinder and at the junction of the end cap and the cylinder body. This accumulated water not only forms a "thermal resistance barrier," making it difficult for steam heat to quickly transfer to the cylinder surface, resulting in reduced drying thermal efficiency and a longer drying cycle for the raw paper, but also causes temperature differences on the cylinder surface, leading to uneven local dryness of the raw paper: areas with excessively high moisture content are prone to fiber loosening and subsequent printing smudging, while areas with excessively low moisture content are prone to embrittlement and warping. Especially for products like cigarette tipping paper that require precise bonding with filter rods, uneven temperature directly reduces the bonding accuracy of the tipping paper, increasing the scrap rate in cigarette production. Secondly, the flattening structure design flaws cause efficiency bottlenecks. Before entering the drying cylinder, the raw paper is easily affected by factors such as unwinding tension fluctuations and wear on the conveyor rollers, resulting in transverse wrinkles or localized wrinkling. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a drying cylinder for paper production. By setting spirally distributed heat strips on the inner side wall of the cylinder, and combining them with a structural design that extends into the inner cavity of the guide block, the spiral direction directs the condensate generated after steam heat exchange to the end of the cylinder, where it is then collected by the guide section of the guide block and discharged through the exhaust pipe. This reduces the accumulation of condensate and improves the drying thermal efficiency.

[0005] A drying cylinder for paper production, comprising: The cylinder body has multiple sets of heat strips fixedly installed in its inner cavity. The heat strips are evenly distributed in a spiral shape on the inner side wall of the cylinder body. One end of each heat strip has a pointed top. The outer side wall of the cylinder body has spiral grooves at both ends. The spiral directions of the two sets of spiral grooves are opposite. The inner cavity of each spiral groove has a spiral strip fixedly installed. A heat-conducting rod is fixedly connected to the side wall of each heat strip. The heat-conducting rod passes through the inner cavity of the cylinder body and is fixedly installed with the spiral groove. The system uses spirally arranged heat strips to guide condensate to one end of the cylinder, transferring heat to the cylinder and heat-conducting rods. The heat is then transferred to the spiral strips via the heat-conducting rods. By setting two sets of spiral strips rotating in opposite directions, the cylinder flattens the paper during the drying process.

[0006] Furthermore, one side of the heat strip is provided with a pointed top, the pointed top being triangular in shape and spirally distributed along the sidewall of the heat strip.

[0007] Furthermore, the cylinder body is connected to an intake pipe and an exhaust pipe at both ends.

[0008] Furthermore, flanges are fixedly connected to the ends of the steam inlet pipe and the steam outlet pipe that are far apart from each other.

[0009] Furthermore, a guide block is fixedly connected to the inner side wall of the cylinder near the exhaust pipe, and the inner cavity of the guide block is provided with a guide section for guiding condensate into the exhaust pipe.

[0010] Furthermore, the inner wall of the cylinder is provided with a through hole for fixing the heat-conducting rod.

[0011] Furthermore, the guide block is cylindrical in shape, and one end of the heat strip extends into the inner cavity of the guide block.

[0012] Furthermore, the spiral strip is made of a flexible silicone-based material.

[0013] Furthermore, the heat strip and the pointed tip are integrally formed from copper.

[0014] Compared with the prior art, the drying cylinder for paper production described in this utility model has the following advantages: 1. By setting spirally distributed heat strips on the inner side wall of the cylinder, and with the structural design extending to the inner cavity of the guide block, the spiral direction guides the condensate generated after steam heat exchange to the end of the cylinder, and then gathers it through the guide part of the guide block and guides it into the exhaust pipe for discharge, which reduces the accumulation of condensate and improves the drying thermal efficiency.

[0015] 2. By setting spiral strips with opposite spiral directions at both ends of the outer wall of the cylinder, the uniform reverse flattening force generated by the reverse spirals during the operation of the drying cylinder can smooth out the wrinkles generated during the transport of the raw paper. In addition, the spiral strips are made of flexible silicone-based material, which not only avoids the scratching and crushing of the raw paper surface by hard materials, but also enables the heat transferred by the heat-conducting rod to achieve auxiliary drying, thereby improving the working efficiency of the drying cylinder. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a cross-sectional structural diagram of the cylinder block of this utility model.

[0017] The markings in the diagram are as follows: 100, cylinder block; 110, steam inlet pipe; 111, steam outlet pipe; 120, flange; 130, spiral groove; 131, spiral strip; 140, heat strip; 141, pointed tip; 142, heat-conducting rod; 150, guide block; 151, guide section; 160, through hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] like Figures 1-3 As shown, a drying cylinder for paper production includes: The cylinder body 100 has multiple sets of heat strips 140 fixedly installed in its inner cavity. The heat strips 140 are evenly distributed in a spiral shape on the inner side wall of the cylinder body 100. One end of the heat strip 140 is provided with a pointed top 141. The outer side wall of the cylinder body 100 is provided with spiral grooves 130 at both ends. The spiral directions of the two sets of spiral grooves 130 are opposite. The inner cavity of the spiral grooves 130 is fixedly provided with spiral strips 131. The side wall of the heat strips 140 is fixedly connected with a heat-conducting rod 142. The heat-conducting rod 142 penetrates the inner cavity of the cylinder body 100 and is fixedly installed with the spiral grooves 130. The condensate is guided to one end of the cylinder 100 by the spirally arranged heat strip 140, and the heat is conducted to the cylinder 100 and the heat conduction rod 142. The heat is then transferred to the spiral strip 131 through the heat conduction rod 142. By setting two sets of spiral strips 131 with opposite directions, the cylinder 100 flattens the raw paper by the two sets of spiral strips 131 when drying the raw paper.

[0023] As a preferred example of this utility model, the spirally distributed heat strips 140 on the inner wall of the cylinder 100 can guide the condensate in the inner cavity to flow towards one end of the cylinder 100 along the spiral direction, avoiding the accumulation of condensate that affects heat transfer; the heat strips 140 synchronously conduct heat to the cylinder 100 and the heat-conducting rod 142 that penetrates the inner cavity of the cylinder 100, and then transfer it to the spiral strip 131 in the spiral groove 130 through the heat-conducting rod 142, so that heat flows between the cylinder 100, the heat-conducting rod 142, and the spiral strip 131, ensuring that the raw paper is heated; while the spiral strips 131 with opposite spiral directions at both ends of the outer wall of the cylinder 100 will form a reverse flattening force on the raw paper in contact when the drying cylinder is running, smoothing out the wrinkles of the raw paper and improving the flatness of the raw paper after drying.

[0024] In the example of this application, a pointed top 141 is provided on one side of the heat strip 140. The pointed top 141 is triangular in shape and is spirally distributed along the side wall of the heat strip 140.

[0025] As a preferred example of this utility model, the heat strip 140 has a triangular pointed top 141 on one side, which is spirally distributed along the side wall of the heat strip 140. Its sharp structure can increase the contact area with steam and accelerate the flow of condensate in combination with the spiral direction.

[0026] In the example of this application, the cylinder block 100 is connected to an inlet pipe 110 and an exhaust pipe 111 at both ends.

[0027] As a preferred example of this utility model, the steam inlet pipe 110 and the steam outlet pipe 111 connected at both ends of the cylinder 100 form a stable steam circulation path: the steam inlet pipe 110 continuously inputs high-temperature steam to provide a heat source for drying; the steam outlet pipe 111 promptly discharges the gas after heat exchange and the condensate guided by the heat bar 140.

[0028] In the example of this application, a flange 120 is fixedly connected to one end of the sidewall of the steam inlet pipe 110 and the steam outlet pipe 111 that is far apart from each other.

[0029] As a preferred example of this utility model, the flange 120 on the side wall of the steam inlet pipe 110 and the steam outlet pipe 111 away from the cylinder body 100 provides a standardized interface for pipe connection. By tightening the bolts, it can be ensured that the steam inlet pipe 110 and the steam outlet pipe 111 are tightly connected to the external pipe, reducing energy waste and safety hazards caused by steam leakage.

[0030] In the example of this application, a guide block 150 is fixedly connected to the inner side wall of the cylinder 100 near the exhaust pipe 111, and the inner cavity of the guide block 150 is provided with a guide portion 151 for guiding condensate into the exhaust pipe 111.

[0031] As a preferred example of this utility model, the guide block 150 on the inner side wall of the cylinder 100 near the exhaust pipe 111 has a guide portion 151 in its inner cavity that can collect the condensate water guided from the heat strip 140 to the end of the cylinder 100 and introduce the condensate water into the exhaust pipe 111 through the guiding effect of the guide portion 151.

[0032] In the example of this application, the inner sidewall of the cylinder 100 is provided with a through hole 160 for fixing the heat-conducting rod 142.

[0033] As a preferred example of this utility model, the through hole 160 opened on the inner side wall of the cylinder 100 provides an installation and fixing position for the heat-conducting rod 142, ensuring the connection between the heat-conducting rod 142 and the heat strip 140 and the spiral strip 131. Specifically, when the heat-conducting rod 142 is connected to the heat strip 140, a sealing element is provided in the through hole 160 near the heat strip connection.

[0034] In the example of this application, the guide block 150 is cylindrical in shape, and one end of the heat strip 140 extends into the inner cavity of the guide block 150.

[0035] As a preferred example of this utility model, the cylindrical guide block 150 is adapted to the shape of the inner cavity of the cylinder 100, and the structure is stable after installation and is not easy to shake due to the rotation of the drying cylinder; while one end of the heat strip 140 extends into the inner cavity of the guide block 150, so that the condensate guided by the heat strip 140 can enter the guide portion 151 of the guide block 150.

[0036] In the example of this application, the spiral 131 is made of a flexible silicone-based material.

[0037] As a preferred example of this utility model, the spiral strip 131 is made of a flexible silicone base material. Its flexibility allows it to apply a flattening force to the base paper when in contact with it by means of the reverse spiral direction, while avoiding scratches and pressure damage to the surface of the base paper by hard materials, thus protecting the integrity of the base paper. In addition, the flexible silicone base has thermal conductivity, which can heat and dry the base paper.

[0038] In the example of this application, the heat strip 140 and the pointed top 141 are integrally formed from copper.

[0039] As a preferred example of this utility model, the heating strip 140 and the pointed top 141 are integrally formed from copper. The high thermal conductivity of copper can accelerate the transfer of steam heat between the two, improve heat utilization efficiency, and shorten the drying time of the paper.

[0040] In practical use, the cylinder body 100 serves as the main body, with its two ends connected to the steam inlet pipe 110 and the steam outlet pipe 111, respectively. The ends of the steam inlet pipe 110 and the steam outlet pipe 111 furthest from the cylinder body 100 are connected to external pipelines via flanges 120. After high-temperature steam enters the inner cavity of the cylinder body 100 through the steam inlet pipe 110, the heat is transferred to the spirally distributed heat strips 140 on the inner wall of the cylinder body 100. The pointed tip 141 on one side of the heat strip 140 is spirally distributed along its side wall, and the heat strip 140 and the pointed tip 141 are integrally formed from copper. While conducting heat, the heat strip 140 also guides the condensate generated in the inner cavity to flow towards the end of the cylinder body 100 near the steam outlet pipe 111 along the spiral direction. A cylindrical guide block 150 is fixed, and one end of the heat strip 140 extends into the inner cavity of the guide block 150. Condensate is guided into the guide block 150 by the heat strip 140 and then guided to the exhaust pipe 111 through the guide part 151 in its inner cavity. At the same time, a heat-conducting rod 142 is connected to the side wall of the heat strip 140. The heat-conducting rod 142 passes through the through hole 160 opened in the inner side wall of the cylinder 100 and is fixedly connected to the spiral strip 131 in the spiral groove 130 at both ends of the outer side wall of the cylinder 100, so as to transfer heat to the spiral strip 131. The spiral groove 130 at both ends of the outer side wall of the cylinder 100 has opposite spiral directions. During the operation of the cylinder 100, the two sets of opposite spiral strips 131 contact the raw paper to dry and flatten the raw paper, thus completing the use. Compared to existing technologies, this application utilizes spirally distributed heat strips 140 on the inner wall of the cylinder 100. These heat strips guide the condensate in the inner cavity towards one end of the cylinder 100 along the spiral direction, preventing condensate accumulation from affecting heat transfer. The heat strips 140 simultaneously conduct heat to the cylinder 100 and the heat-conducting rod 142 penetrating the inner cavity of the cylinder 100, and then transfer it to the spiral strips 131 in the spiral groove 130 via the heat-conducting rod 142. This allows heat to circulate between the cylinder 100, the heat-conducting rod 142, and the spiral strips 131, ensuring the paper is heated. The spiral strips 131, with opposite spiral directions at both ends of the outer wall of the cylinder 100, exert a reverse flattening force on the paper during cylinder operation, smoothing out paper wrinkles and improving the flatness of the dried paper. The triangular pointed tip 141 on one side of the heat strip 140, spirally distributed along the side wall of the heat strip 140, increases the contact area with steam, and, combined with the spiral direction, further enhances the heat transfer. Rapid condensate drainage; by setting flanges 120 on the side walls of the steam inlet pipe 110 and the exhaust pipe 111 away from the cylinder body 100, a standardized interface is provided for pipeline connection. Bolt tightening ensures a tight connection between the steam inlet pipe 110 and the exhaust pipe 111 and the external pipeline, reducing energy waste and safety hazards caused by steam leakage; the guide block 150 on the inner side wall of the cylinder body 100 near the exhaust pipe 111, the guide part 151 of its inner cavity can collect the condensate guided by the heat bar 140 to the end of the cylinder body 100, and introduce the condensate into the exhaust pipe 111 through the guiding effect of the guide part 151; by setting the cylindrical guide block 150 to match the shape of the inner cavity of the cylinder body 100, the structure is stable after installation and is not easy to shake due to the rotation of the drying cylinder; and one end of the heat bar 140 extends into the inner cavity of the guide block 150, so that the condensate guided by the heat bar 140 can enter the guide part 151 of the guide block 150.

[0041] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A drying cylinder for paper production, characterized in that, include: A cylinder body (100) has multiple sets of heat strips (140) fixedly installed in its inner cavity. The heat strips (140) are evenly distributed in a spiral shape on the inner side wall of the cylinder body (100). One end of each heat strip (140) is provided with a pointed top (141). The outer side wall of the cylinder body (100) is provided with spiral grooves (130) at both ends. The spiral directions of the two sets of spiral grooves (130) are opposite. The inner cavity of each spiral groove (130) is fixedly provided with a spiral strip (131). A heat-conducting rod (142) is fixedly connected to the side wall of each heat strip (140). The heat-conducting rod (142) penetrates the inner cavity of the cylinder body (100) and is fixedly installed with the spiral groove (130).

2. The drying cylinder for paper production according to claim 1, characterized in that, The heat strip (140) has a pointed top (141) on one side. The pointed top (141) is triangular in shape and is spirally distributed along the side wall of the heat strip (140).

3. The drying cylinder for paper production according to claim 1, characterized in that, The cylinder (100) is connected to an inlet pipe (110) and an exhaust pipe (111) at its two ends respectively.

4. A drying cylinder for paper production according to claim 3, characterized in that, Flanges (120) are fixedly connected to the ends of the side walls of the steam inlet pipe (110) and the steam outlet pipe (111) that are far apart from each other.

5. A drying cylinder for paper production according to claim 3, characterized in that, A guide block (150) is fixedly connected to the inner side wall of the cylinder (100) near the exhaust pipe (111). The inner cavity of the guide block (150) is provided with a guide section (151) for guiding condensate to the exhaust pipe (111).

6. A drying cylinder for paper production according to claim 1, characterized in that, The inner wall of the cylinder (100) is provided with a through hole (160) for fixing the heat-conducting rod (142).

7. A drying cylinder for paper production according to claim 5, characterized in that, The guide block (150) is cylindrical in shape, and one end of the heat strip (140) extends into the inner cavity of the guide block (150).

8. A drying cylinder for paper production according to claim 1, characterized in that, The spiral strip (131) is made of flexible silicone-based material.

9. A drying cylinder for paper production according to claim 2, characterized in that, The heat strip (140) and the pointed top (141) are integrally formed from copper.

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