Drying tunnel curing system for composite paper

Abstract

The utility model discloses a drying tunnel curing system for composite paper, which is used for jet drying of the composite paper in a drying tunnel and comprises at least four drying ovens sequentially connected along a production line, and all the drying ovens form the drying tunnel for jet drying of the composite paper. An air inlet and an air outlet are respectively formed in two sides of the upper part of each drying oven; a plurality of nozzles for jetting and impacting hot air on the composite paper coating are uniformly arranged in the upper space of the drying oven between the air inlet and the air outlet; an air outlet is further formed in the lower space of the drying oven; a fan, a heating box and a heat exchanger are arranged beside each drying oven, an air outlet of each drying oven returns air to the heating box through an air return pipe, the fan is connected to one side of the heating box, and the output end of the fan is communicated with the air inlet of the drying oven through an air inlet pipe; the other side of the heating box communicates with a heat exchanger through a pipeline, and the heat exchanger is connected with a fresh air inlet pipe, a first air exhaust connecting pipe communicating with an air exhaust opening of the drying box and a second air exhaust connecting pipe for sending out air in the first air exhaust connecting pipe.

Description

Technical field

[0001] The utility model relates to a drying technology for composite paper of cigarette labels, in particular to a drying tunnel curing system for the composite paper. [Background Technology]

[0002] At present, cigarette label composite paper generally adopts wet composite processing, which uses a glue coating roller to first apply composite glue on the composite film, and then laminate and press it with the base paper to composite the composite film and paper together. Then, it is heated and dried in the drying channel of the oven to dry the solvent in the composite glue, so that the base paper and the composite film are tightly bonded together to produce cigarette label composite paper with good performance.

[0003] Therefore, in the composite processing of cigarette label composite paper, the oven is an important part of the composite drying system. The drying principle of the oven is to spray the hot air from the nozzle onto the coating, transfer the temperature to the coating through the impact of the airflow, and the solvent of the coating evaporates and is carried away by the airflow to achieve the purpose of drying.

[0004] The existing drying oven structure includes a drying tunnel body with an internal cavity and an air inlet located at the upper edge of the drying tunnel body. A plurality of nozzles are provided at the bottom of the internal cavity of the drying tunnel body, and an air extraction port is provided between adjacent nozzles. The air extraction port is connected to an exhaust pipe extending into the cavity. The exhaust pipe passes through the upper part of the internal cavity and exits from the upper surface of the drying tunnel body. Although the existing drying tunnel body can blow hot air from the outside to the surface of the composite paper for drying, the air inlet connecting the existing drying tunnel body to the cavity is provided on one side of the drying tunnel body. When the air is supplied from the outside, the pressure inside the cavity is easily uneven, resulting in uneven wind speed and temperature of the multiple nozzles provided at the bottom of the cavity, affecting the drying effect. Therefore, the existing drying oven body structure is not suitable for the processing of cigarette label composite paper coatings with high drying requirements. [Utility Model Content]

[0005] The utility model provides a drying tunnel curing system for composite paper. By forming a reflux pipeline, it is beneficial to discharge a part of the old air in the system to reduce the concentration of harmful gases and to replenish a part of new air to reduce the concentration of harmful gases. At the same time, it is convenient to recycle the old air and increase its temperature as needed, thereby achieving energy conservation and emission reduction and improving energy utilization.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A drying tunnel curing system for composite paper, used for jet drying of composite paper in a drying tunnel, comprising at least four drying ovens connected in sequence along a production line, all of which form a drying tunnel for jet drying composite paper;

[0008] An air inlet and an air outlet are respectively provided on both sides of the upper portion of each oven. In the upper space of the oven between the air inlet and the air outlet, a plurality of nozzles are evenly installed along the feeding direction of the composite paper and positioned above the composite paper for spraying hot air onto the composite paper coating to dry the composite paper.

[0009] The lower space of the oven corresponding to the nozzle and the composite paper is also provided with an exhaust port located in the middle of the bottom side for discharging the volatile solvent gas generated after the composite paper coating is dried;

[0010] A fan, a heating box, and a heat exchanger are also provided on each side of the oven. The oven air outlet returns air to the heating box through a return air duct. The heating box is provided with a heater for heating the return air. The fan is connected to one side of the heating box for extracting the return air heated gas in the heating box. The output end of the fan is connected to the oven air inlet through an air inlet duct and continuously supplies return air to the drying duct in the oven.

[0011] The other side of the heating box is directly connected to the heat exchanger through a pipeline. The heat exchanger is connected with a fresh air inlet pipe for facilitating the introduction of external fresh air, a first exhaust connecting pipe connected to the exhaust port of the oven, and a second exhaust connecting pipe for sending out the air in the first exhaust connecting pipe. The first exhaust connecting pipe exchanges heat and cold between part of the hot air flow discharged from the oven and the external fresh air entering through the fresh air inlet pipe, and then the air is directly discharged through the second exhaust connecting pipe.

[0012] Preferably, the second exhaust connection pipe on each of the heat exchangers corresponding to all the ovens is connected to a main exhaust duct for facilitating the common exhaust of harmful gases.

[0013] Preferably, a feed port is provided on the right side of the drying channel formed by all the ovens, and a discharge port is provided on the left side of the drying channel. A conveying mechanism is provided between the feed port and the discharge port and crosses the interior of all the ovens. All the nozzles are located above the conveying mechanism, and the spraying direction of the nozzles is toward the conveying mechanism.

[0014] The beneficial effects of the utility model are:

[0015] In the utility model, a loop is formed by sequentially connecting the oven air outlet, the return air duct, the heating box, the fan and the oven air inlet, so as to facilitate the recycling of old air and increase its temperature as needed, while achieving energy conservation and emission reduction.

[0016] At the same time, the first exhaust connecting pipe sends part of the air in the oven to the heat exchanger and then discharges it through the second exhaust connecting pipe. The corresponding new air entering from the new air inlet pipe is preheated through the heat exchanger and the hot air discharged from the first exhaust connecting pipe before being sent to the heating box, so that a part of the old air in the system is discharged to reduce the concentration of harmful gases and it is beneficial to add a part of new air to the system to reduce the concentration of harmful gases. In this process, the discharged old air is preheated by heat exchange with the new air added through the heat exchanger, which is beneficial to heat recovery and energy-saving control.

[0017] In addition, preheating the fresh air entering through the fresh air inlet pipe can effectively prevent the air with insufficient temperature from directly entering the oven and affecting the drying effect.

Brief Description of the Drawings

[0018] Figure 1 This is a schematic diagram of the top view of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 3 This is a working principle diagram of a single oven of the utility model. [Specific implementation method]

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Composite paper drying tunnel curing system, such as Figure 1 and Figure 2 As shown, a drying tunnel for jet drying composite paper includes four ovens 1 connected sequentially along a production line, with all ovens 1 forming a drying tunnel for jet drying composite paper. An air inlet 2 and an air outlet 3 are provided on both sides of the upper portion of each oven 1. In the upper space of the oven 1 between the air inlet 2 and the air outlet 3, a plurality of nozzles 4 are evenly installed above the composite paper and along the feed direction of the composite paper. The nozzles 4 are used to spray hot air onto the composite paper coating to dry the composite paper. A feed port a is provided on the right side of the drying tunnel formed by all ovens 1, and a discharge port b is provided on the left side of the drying tunnel. A conveying mechanism 5 is provided between the feed port a and the discharge port b, and runs across the interior of all ovens 1 for curing and drying the composite paper. All nozzles 4 are located above the conveying mechanism 5, with the spray direction of the nozzles 4 directed toward the conveying mechanism 5.

[0023] like Figures 1 to 3As shown, the nozzle 4 and the lower space of the drying oven 1 corresponding to the composite paper are also provided with an exhaust port 6 located in the middle of the bottom side for discharging part of the volatile solvent gas generated after drying the composite paper coating; each drying oven 1 is also provided with a fan 7, a heating box 8 and a heat exchanger 9 on the side. The air outlet 3 of the drying oven 1 returns air to the heating box 8 through a return air duct 10. The heating box 8 is provided with a heater (not shown) for heating the return air. The fan 7 is connected to one side of the heating box 8 for extracting the heated return air in the heating box 8. The output end of the fan 7 is connected to the air inlet 2 of the drying oven 1 through an air inlet pipe 11 and continuously supplies return air to the drying channel in the drying oven 1; the other side of the heating box 8 is directly connected to the heat exchanger 9 through a pipeline. The heat exchanger 9 is connected to a fresh air inlet pipe 12 for facilitating the introduction of external fresh air, a first exhaust connecting pipe 13 connected to the exhaust port 6 of the drying oven 1, and a second exhaust connecting pipe 14 for sending the air in the first exhaust connecting pipe 13 out. Part of the hot air discharged from the oven 1 is directly discharged through the second exhaust connecting pipe 14 after undergoing heat and cold exchange with the external fresh air entering through the fresh air inlet pipe 12. The second exhaust connecting pipe 14 on each heat exchanger 9 corresponding to all ovens 1 is connected to a main exhaust duct 15 for the common discharge of harmful gases.

[0024] In the entire system, the air outlet 3 of the oven 1, the return air duct 10, the heating box 8, the fan 7, and the air inlet 2 of the oven 1 are connected in sequence to form a return air loop, which realizes the recycling of old air and increases the blast temperature as needed, thereby achieving energy conservation and emission reduction and effectively improving energy utilization.

[0025] Moreover, the fresh air entering from the fresh air inlet pipe 12 passes through the heat exchanger 9 and the first exhaust connecting pipe 13 to be preheated by heat exchange and then sent to the heating box 8, so that a part of the old air in the system is discharged to reduce the concentration of harmful gases and it is beneficial to supplement a part of the new air to reduce the concentration of harmful gases. At the same time, the discharged old air passes through the heat exchanger 9 to perform heat exchange and preheating on the fresh air that is supplemented, which is beneficial to heat recovery and energy-saving control.

[0026] In the description of the present utility model, it should be noted that the terms "front", "rear", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present utility model.

[0027] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Any equivalent changes based on the shape, structure, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. Composite paper drying tunnel curing system, used for spray drying of composite paper in the drying tunnel, characterized by: It comprises at least four drying ovens connected in sequence along the production line, all of which form a drying tunnel for jet drying composite paper; An air inlet and an air outlet are respectively provided on both sides of the upper portion of each oven. In the upper space of the oven between the air inlet and the air outlet, a plurality of nozzles are evenly installed along the feeding direction of the composite paper and positioned above the composite paper for spraying hot air onto the composite paper coating to dry the composite paper. The lower space of the oven corresponding to the nozzle and the composite paper is also provided with an exhaust port located in the middle of the bottom side for discharging the volatile solvent gas generated after the composite paper coating is dried; A fan, a heating box, and a heat exchanger are also provided on each side of the oven. The oven air outlet returns air to the heating box through a return air duct. The heating box is provided with a heater for heating the return air. The fan is connected to one side of the heating box for extracting the return air heated gas in the heating box. The output end of the fan is connected to the oven air inlet through an air inlet duct and continuously supplies return air to the drying duct in the oven. The other side of the heating box is directly connected to the heat exchanger through a pipeline. The heat exchanger is connected with a fresh air inlet pipe for facilitating the introduction of external fresh air, a first exhaust connecting pipe connected to the exhaust port of the oven, and a second exhaust connecting pipe for sending out the air in the first exhaust connecting pipe. The first exhaust connecting pipe exchanges heat and cold between part of the hot air flow discharged from the oven and the external fresh air entering through the fresh air inlet pipe, and then the air is directly discharged through the second exhaust connecting pipe.

2. The drying tunnel curing system for composite paper according to claim 1, characterized in that: The second exhaust connecting pipe on each of the heat exchangers corresponding to all the ovens is connected to a main exhaust duct for facilitating the common exhaust of harmful gases.

3. The drying tunnel curing system for composite paper according to claim 1, characterized in that: A feed port is provided on the right side of the drying channel formed by all the ovens, and a discharge port is provided on the left side of the drying channel. A conveying mechanism is provided between the feed port and the discharge port and crosses the interior of all the ovens. All the nozzles are located above the conveying mechanism, and the spraying direction of the nozzles is toward the conveying mechanism.

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