CN215918012U

CN215918012U - Glassine coating device

Info

Publication number: CN215918012U
Application number: CN202121437386.4U
Authority: CN
Inventors: 邵旸
Original assignee: Zhejiang Hengmu Composite Material Co ltd
Current assignee: Zhejiang Hengmu Composite Material Co ltd
Priority date: 2021-06-26
Filing date: 2021-06-26
Publication date: 2022-03-01
Anticipated expiration: 2031-06-26

Abstract

The utility model discloses a glassine coating device which comprises a rack, wherein two parallel conveying belts are arranged on the rack, a cleaning device, a coating machine and a drying device are sequentially arranged along the conveying direction of the two conveying belts, two slit coating heads are arranged on the coating machine, the two slit coating heads respectively correspond to the two conveying belts, two rolls of base materials can be coated at the same time, the coating efficiency is improved, the slit coating heads can horizontally move for adjusting the distance and rotate for adjusting the angle, the slit coating heads are used for coating the base materials with different widths at the same time, and the application range of the coating machine is enlarged.

Description

Glassine coating device

Technical Field

The utility model relates to the technical field of coating, in particular to a glassine coating device.

Background

One of the industrial papers, glassine paper is made by coating and processing glassine paper. The glassine paper base is compact and uniform, and has good internal strength and transmittance. Is a common material for manufacturing bar code labels, adhesive stickers, adhesive tapes or adhesive industrial products, and is particularly suitable for rotary and flat die cutting. The glassine paper has the functions of high temperature resistance, moisture resistance, oil resistance and the like, and is generally used for packaging in the industries of food, medicine and the like. The method is mainly used for: high-speed automatic labeling (especially suitable for high-speed label sticking) special adhesive tapes, double-sided adhesive tape base material trademarks, laser anti-counterfeiting marks and other release applications. The main use in medical products is as release paper for adhesive tapes and dressing products. The gram weight is 60g-120 g.

In the prior art, a common coating machine for coating glassine only has one coating head, and only one roll of base material can be coated at a time, so that the coating efficiency is reduced, and a plurality of rolls of base materials need to be coated by a plurality of coating machines, so that the input cost of equipment is increased.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides a glassine coating device.

In order to achieve the technical effects, the utility model adopts the following scheme:

a glassine coating device comprises a frame, two parallel conveyer belts are arranged on the frame, a cleaning device, a coating machine and a drying device are sequentially arranged along the conveying direction of the two conveyer belts, the cleaning device comprises a cleaning box, two ends of the cleaning box are respectively provided with a first feeding hole and a first discharging hole for the two conveyer belts to pass through, a brush and a blower are sequentially arranged in the cleaning box along the conveying direction of the conveying belt, the brush comprises an installation rod, the mounting rod is arranged across the two conveyer belts, two ends of the mounting rod are respectively arranged on the front inner wall and the rear inner wall of the cleaning box, the lower side of the mounting rod is provided with a plurality of soft bristles, the number of the hair dryers is two, the two hair dryers are respectively arranged above the two conveying belts, and air outlets of the hair dryers face the corresponding conveying belts; the coating machine comprises a track arranged across the upper parts of two conveying belts, the track is arranged on a lower pressure plate, the lower pressure plate is arranged on a rack through a lifting mechanism and moves up and down, two mounting plates are slidably mounted on the track, the mounting plates are locked on the track through first locking mechanisms, the lower ends of the mounting plates are rotatably provided with mounting frames through rotating shafts, the mounting frames rotate in the horizontal direction, the mounting frames are locked on the mounting plates through second locking mechanisms, slit coating heads are mounted on the mounting frames, coating liquid storage tanks are further mounted on the rack and are respectively connected with the two slit coating heads through two feeding pipes, and pressure pumps and flow meters are arranged on the feeding pipes; the drying device comprises a drying box body, wherein a second feeding hole and a second discharging hole are distributed at two ends of the drying box body, two conveying belts sequentially penetrate through the second feeding hole, the inside of the drying box body and the second discharging hole, the top end of the drying box is connected with an air inlet pipe, a heating device is installed on the air inlet pipe and comprises a heating box, the air inlet pipe is communicated with the heating box, an electric heating wire and a fan assembly are sequentially arranged in the heating box along the direction of air flow, a wind outlet head is arranged in the drying box body and is fixedly installed at the top of the drying box body, the wind outlet head is hemispherical, the curved surface of the wind outlet head faces downwards, the center of the top of the wind outlet head is communicated with the air inlet pipe through a connecting pipe, a plurality of air outlets are uniformly formed in the curved surface of the wind outlet head, and a plurality of ventilating pipes communicated with the connecting pipe and a plurality of air outlets are arranged in the wind outlet head, the ventilation pipe includes vertical portion and dispersion portion, the vertical setting of vertical portion, in the upper end of vertical portion inserted the connecting tube, the lower extreme of vertical portion passes through dispersion portion and connects the air outlet that corresponds.

According to the preferable technical scheme, the lifting mechanism comprises an air cylinder, the air cylinder is fixedly installed on the rack, an expansion rod of the air cylinder expands and contracts downwards and is fixedly connected with the lower pressing plate, guide holes are formed in two ends of the lower pressing plate respectively, guide rods penetrate through the guide holes in a matched mode, and the guide rods are fixedly installed on the rack.

Preferred technical scheme, the track includes two parallel arrangement's slide rail, both sides all form the spacing groove towards the inside sunken of track around the slide rail, the length setting of spacing groove along the slide rail, the upper surface of mounting panel is equipped with two spouts towards the undercut, spout and slide rail phase-match, two in two spouts were located respectively to the slide rail, the protrusion is equipped with on the inner wall of spout with spacing groove assorted spacing edge, spacing card is gone into in the spacing groove along the card.

According to the preferable technical scheme, the first locking mechanism comprises threaded holes formed in the front side wall and the rear side wall of the mounting plate, the threaded holes are communicated with corresponding sliding grooves, bolts are arranged in the threaded holes in a matched mode, and the bolts are abutted to corresponding sliding rails.

The preferred technical scheme, second locking mechanism includes the vertical pivot hole that runs through the mounting panel, the pivot hole is located between two spouts, pivot hole and pivot phase-match, the upper surface of mounting panel still has the mounting groove, the upper end in pivot hole and the bottom intercommunication of mounting groove, it is downthehole that the pivot is inserted to the upper end of pivot, be equipped with the stopper in the mounting groove, the size of stopper is greater than the size in pivot hole, the upper end and the stopper fixed connection of pivot, be equipped with screw thread portion in the pivot, screw thread portion matches and is equipped with lock nut, lock nut is located between mounting bracket and the mounting panel.

The preferable technical scheme, the lower extreme intercommunication of stoving case body has the exhaust pipe, be connected with first air pump on the exhaust pipe, still be equipped with preheating device on the air-supply line, preheating device locates one side that heating device kept away from the stoving case body, preheating device includes the preheating cabinet, air-supply line and preheating cabinet intercommunication, be equipped with inlet plenum and play air chamber on the side of the both sides of perpendicular to air current direction on the preheating cabinet respectively, the exhaust pipe intercommunication inlet plenum, it has the outlet duct to go out the air chamber intercommunication, be equipped with a plurality of heat exchange tubes in the preheating cabinet, the length direction perpendicular to air current direction of heat exchange tube, heat exchange tube intercommunication inlet plenum and play air chamber.

The preferred technical scheme, be equipped with a plurality of first heat-conducting plates and second heat-conducting plate in the heat exchange tube, first heat-conducting plate and second heat-conducting plate all set up, a plurality of with the length direction of the inner wall fixed connection of heat exchange tube and perpendicular to heat exchange tube first heat-conducting plate and a plurality of second heat-conducting plate set up along the length direction interval of heat exchange tube, and are a plurality of first heat-conducting plate and a plurality of second heat-conducting plate set up the air duct that forms along the continuous bending that the heat exchange tube extends in turn on one left and right sides in the heat exchange tube.

Compared with the prior art, beneficial effect does:

1. cleaning the coating surface of the glassine paper substrate in a mode of a soft brush and air blowing in sequence, so that the cleaning is more thorough and clean, and the residue of dust is reduced;

2. the two slit coating heads can simultaneously coat two rolls of base materials, so that the coating efficiency is improved, and the slit coating heads can horizontally move to adjust the distance and rotate to adjust the angle, so as to simultaneously coat two rolls of base materials with different widths, thereby enlarging the application range of the coating machine;

3. the hot-blast head that will heat the completion is discharged through going out, and the air outlet that goes out the head lies in the curved surface that goes out the head, consequently is towards all around via a first exhaust hot-blast of going out, and this internal hot-air current that forms the flow of formation is dried to drenching membrane paper in the stoving case, drenches that each part is heated evenly on the membrane paper, has improved oven-dry mass with rated load.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic side view of the structure of the coater of the present invention;

FIG. 3 is a schematic view of the track structure of the present invention;

FIG. 4 is a schematic view of the drying apparatus according to the present invention;

FIG. 5 is a schematic view of the heating apparatus according to the present invention;

FIG. 6 is a schematic view of the preheating apparatus according to the present invention.

Reference numerals: 1. a frame; 2. a conveyor belt; 3. a cleaning device; 301. cleaning the box; 302. a first feed port; 303. a first discharge port; 304. a brush; 305. a blower; 4. coating machine; 401. a track; 402. A lower pressing plate; 403. mounting a plate; 404. a rotating shaft; 405. a mounting frame; 406. a slit coating head; 407. a coating liquid storage tank; 408. a feed pipe; 409. a pressure pump; 4010. a flow meter; 4011. a cylinder; 4012. a guide bar; 4013. a slide rail; 4014. a limiting groove; 4015. a chute; 4016. a limiting edge; 4017. a bolt; 4018. mounting grooves; 4019. a limiting block; 4020. locking the nut; 5. a drying device; 501. a drying box body; 502. a second feed port; 503. a second discharge port; 504. an air inlet pipe; 505. a heating device; 506. a heating box; 507. an electric heating wire; 508. a fan assembly; 509. an air outlet head; 5010. a connecting pipe; 5011. an air outlet; 5012. a vent pipe; 5013. a vertical portion; 5014. a dispersing section; 5015. an exhaust duct; 5016. a first air pump; 5017. a preheating device; 5018. a preheating box; 5019. an air intake chamber; 5020. An air outlet chamber; 5021. an air outlet pipe; 5022. a heat exchange pipe; 5023. a first heat-conducting plate; 5024. a second heat-conducting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The utility model provides a glassine coating unit, includes the frame, be equipped with two parallel arrangement's conveyer belt in the frame, the both ends of two conveyer belts all correspond and are equipped with blowing roller and receipts material roller, and the conveyer belt comprises a plurality of conveying rollers along the conveying route setting, is equipped with cleaning device, coating machine and drying device along the direction of transfer of two conveyer belts in proper order.

The cleaning device comprises a cleaning box, wherein a first feed inlet and a first discharge outlet for two conveyer belts to pass through are formed in two ends of the cleaning box respectively, a brush and a blower are sequentially arranged in the cleaning box along the conveying direction of the conveyer belts, the coated surface of the glassine paper substrate is firstly cleaned preliminarily through the brush to remove most of dust impurities, and then residual dust impurities are removed through the blower;

the coating machine comprises a track 401 arranged above a conveying belt, wherein the track 401 horizontally spans two conveying belts 2, the length direction of the track 401 is perpendicular to the conveying direction of the conveying belts 2, the track 401 is arranged on a lower pressing plate 402, the lower pressing plate 402 is arranged on a frame 1 through a lifting mechanism to move up and down, two mounting plates 403 are arranged on the track 401 in a sliding manner, the mounting plates 403 are locked on the track 401 through first locking mechanisms, a mounting frame 405 is rotatably arranged at the lower ends of the mounting plates 403 through a rotating shaft 404, the mounting frame 405 rotates in the horizontal direction, the mounting frame 405 is locked on the mounting plates 403 through second locking mechanisms, slit coating heads 406 are arranged on the mounting frame 405, coating liquid storage tanks 407 are further arranged on the frame 1, and the coating liquid storage tanks 407 are respectively connected with the two slit coating heads 406 through two feeding pipes 408, the feeding pipe 408 is provided with a pressure pump 409 and a flow meter 4010, coating liquid in a coating liquid storage tank 407 is pumped to the slit coating head 406 through the pressure pump 409, the flow rate is measured through the flow meter 4010, coating is performed through the slit coating head 406, two slit coating heads 406 can be used for coating materials on two conveyor belts 2 at the same time, the coating efficiency is improved, the slit coating head 406 can move through a track 401 and rotate through a rotating shaft 404 to adjust the position and the angle of the slit coating head 406, and after the slit coating head 406 rotates at different angles, the widths of projections in the conveying direction of the conveyor belts 2 are different, so that the slit coating head 406 can be used for coating materials with different widths;

the drying device comprises a drying box body 501, a conveyor belt 2 conveys the laminating paper to pass through the drying box body 501, the two ends of the drying box body 501 are distributed with a second feeding hole 502 and a second discharging hole 503, the conveyor belt 2 sequentially passes through the second feeding hole 502, the interior of the drying box body 501 and the second discharging hole 503, the top end of the drying box is connected with an air inlet pipe 504, a heating device 505 is installed on the air inlet pipe 504, the heating device 505 comprises a heating box 506, the air inlet pipe 504 is communicated with the heating box 506, an electric heating wire 507 and a fan assembly 508 are sequentially arranged in the heating box 506 along the direction of air flow, the fan assembly 508 comprises an installation frame, the installation frame is fixedly installed in the heating box 506, a fan is installed in the installation frame, the fan assembly 508 works to form negative pressure to suck air through the air inlet pipe 504 and heat the air through the electric heating wire 507, air after the heating is insufflated out first 509 by fan assembly 508 again, be equipped with out first 509 in the stoving case body 501, go out first 509 fixed mounting in the top of stoving case body 501, it is the hemisphere to go out first 509, the curved surface that goes out first 509 faces down, the center that goes out first 509 top is passed through connecting pipe 5010 and is communicated with air-supply line 504, evenly seted up a plurality of air outlets 5011 on the curved surface of play first 509, be equipped with a plurality of ventilation pipes 5012 intercommunication connecting pipe 5010 and a plurality of air outlet 5011 in going out first 509, ventilation pipe 5012 includes vertical portion 5013 and dispersion portion 5014, vertical portion 5013 is vertical, in connecting pipe 5010 is inserted to the upper end of vertical portion 5013, the lower extreme of vertical portion 5013 passes through dispersion portion 5014 and connects corresponding air outlet 5011, blows to around with the air diffusion after heating through going out first 509, has enlarged the area of being ventilated in the stoving case body 501, the temperature rising speed in the drying box body 501 is increased.

According to the preferable technical scheme, the lifting mechanism comprises a cylinder 4011, the cylinder 4011 is fixedly installed on the rack 1, a telescopic rod of the cylinder 4011 stretches downwards and is fixedly connected with the lower pressing plate 402, guide holes are formed in two ends of the lower pressing plate 402 respectively, guide rods 4012 penetrate through the guide holes in a matched mode, and the guide rods 4012 are fixedly installed on the rack 1.

Preferred technical scheme, track 401 includes two parallel arrangement's slide rail 4013, slide rail 4013's front and back both sides all form spacing groove 4014 towards the inside sunken of track 401, spacing groove 4014 sets up along slide rail 4013's length, the upper surface of mounting panel 403 is equipped with two spout 4015 towards the undercut, spout 4015 and slide rail 4013 phase-match, two slide rail 4013 locates respectively in two spout 4015, the protrusion is equipped with spacing 4016 along the 4016 with spacing groove 4014 assorted on the inner wall of spout 4015, spacing 4014 of card income is followed in 4016.

Preferably, first locking mechanism is including locating the screw hole on mounting panel 403 front side and the rear side lateral wall, the screw hole communicates with the spout 4015 that corresponds, the downthehole matching of screw hole is equipped with bolt 4017, bolt 4017 and the slide rail 4013 butt that corresponds.

Preferred technical scheme, second locking mechanism includes the vertical pivot 404 hole that runs through mounting panel 403, pivot 404 hole is located between two spout 4015, pivot 404 hole and pivot 404 phase-match, the upper surface of mounting panel 403 still has mounting groove 4018, the upper end in pivot 404 hole and the bottom of mounting groove 4018 communicate, it is downthehole that pivot 404 is inserted to the upper end of pivot 404, be equipped with stopper 4019 in the mounting groove 4018, stopper 4019's size is greater than the size in pivot 404 hole, the upper end and the stopper 4019 fixed connection of pivot 404, be equipped with screw thread portion on the pivot 404, the screw thread portion matching is equipped with lock nut 4020, lock nut 4020 is located between mounting bracket 405 and the mounting panel, during the locking, rotates lock nut 4020, makes lock nut 4020 and stopper 4019 combined action press from both sides tight mounting panel 403.

In a preferable technical scheme, the lower end of the drying box body 501 is communicated with an exhaust pipe 5015, the exhaust pipe 5015 is connected with a first air pump 5016, hot air in the drying box body 501 is pumped out by the first air pump 5016, the air inlet pipe 504 is further provided with a preheating device 5017, the preheating device 5017 is arranged on one side of the heating device 505 far away from the drying box body 501, the preheating device 5017 comprises a preheating box 5018, the air inlet pipe 504 is communicated with the preheating box 5018, two side faces of the preheating box 5018 perpendicular to the air flow direction are respectively provided with an air inlet chamber 5019 and an air outlet chamber 5020, the exhaust pipe 5015 is communicated with the air inlet chamber 5019, the air outlet chamber 5020 is communicated with an air outlet pipe 5021, air sucked by a fan assembly 508 passes through the preheating box 5018 and then enters the heating box 506, a plurality of heat exchange pipes 5022 are arranged in the preheating box 5018, and the length direction of the heat exchange pipes 5022 is perpendicular to the air flow direction, the heat exchange pipe 5022 is communicated with the air inlet chamber 5019 and the air outlet chamber 5020, hot air in the exhaust pipe 5015 enters the heat exchange pipe 5022 through the gold air inlet chamber 5019 to exchange heat with air flowing through the preheating tank 5018, the air in the preheating tank 5018 is heated, and energy is saved.

An optimized technical scheme, be equipped with a plurality of first heat-conducting plates 5023 and second heat-conducting plate 5024 in the heat exchange tube 5022, first heat-conducting plate 5023 and second heat-conducting plate 5024 all set up with the inner wall fixed connection of heat exchange tube 5022 and the length direction of perpendicular to heat exchange tube 5022, a plurality of first heat-conducting plate 5023 and a plurality of second heat-conducting plate 5024 set up along the length direction interval of heat exchange tube 5022, a plurality of first heat-conducting plate 5023 and a plurality of second heat-conducting plate 5024 set up in turn a left side and a right side in heat exchange tube 5022 and form the continuous bent air duct that extends along heat exchange tube 5022, and the continuous bent air duct has increased the dwell time of steam in heat exchange tube 5022, promotes heat exchange efficiency.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as would be conventionally found in use of the products of the present invention, or as would be conventionally understood by one skilled in the art, and are used merely for convenience in describing and simplifying the utility model, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. A glassine coating device is characterized by comprising a frame, wherein two parallel conveyer belts are arranged on the frame, a cleaning device, a coating machine and a drying device are sequentially arranged along the conveying direction of the two conveyer belts, the cleaning device comprises a cleaning box, two ends of the cleaning box are respectively provided with a first feeding hole and a first discharging hole for the two conveyer belts to pass through, a brush and a blower are sequentially arranged in the cleaning box along the conveying direction of the conveying belt, the brush comprises an installation rod, the mounting rod is arranged across the two conveyer belts, two ends of the mounting rod are respectively arranged on the front inner wall and the rear inner wall of the cleaning box, the lower side of the mounting rod is provided with a plurality of soft bristles, the number of the hair dryers is two, the two hair dryers are respectively arranged above the two conveying belts, and air outlets of the hair dryers face the corresponding conveying belts; the coating machine comprises a track arranged across the upper parts of two conveying belts, the track is arranged on a lower pressure plate, the lower pressure plate is arranged on a rack through a lifting mechanism and moves up and down, two mounting plates are slidably mounted on the track, the mounting plates are locked on the track through first locking mechanisms, the lower ends of the mounting plates are rotatably provided with mounting frames through rotating shafts, the mounting frames rotate in the horizontal direction, the mounting frames are locked on the mounting plates through second locking mechanisms, slit coating heads are mounted on the mounting frames, coating liquid storage tanks are further mounted on the rack and are respectively connected with the two slit coating heads through two feeding pipes, and pressure pumps and flow meters are arranged on the feeding pipes; the drying device comprises a drying box body, wherein a second feeding hole and a second discharging hole are distributed at two ends of the drying box body, two conveying belts sequentially penetrate through the second feeding hole, the inside of the drying box body and the second discharging hole, the top end of the drying box is connected with an air inlet pipe, a heating device is installed on the air inlet pipe and comprises a heating box, the air inlet pipe is communicated with the heating box, an electric heating wire and a fan assembly are sequentially arranged in the heating box along the direction of air flow, a wind outlet head is arranged in the drying box body and is fixedly installed at the top of the drying box body, the wind outlet head is hemispherical, the curved surface of the wind outlet head faces downwards, the center of the top of the wind outlet head is communicated with the air inlet pipe through a connecting pipe, a plurality of air outlets are uniformly formed in the curved surface of the wind outlet head, and a plurality of ventilating pipes communicated with the connecting pipe and a plurality of air outlets are arranged in the wind outlet head, the ventilation pipe includes vertical portion and dispersion portion, the vertical setting of vertical portion, in the upper end of vertical portion inserted the connecting tube, the lower extreme of vertical portion passes through dispersion portion and connects the air outlet that corresponds.

2. The glassine coating device as claimed in claim 1, wherein the lifting mechanism comprises a cylinder, the cylinder is fixedly mounted on the frame, a telescopic rod of the cylinder is extended and contracted downwards and is fixedly connected with the lower pressing plate, two ends of the lower pressing plate are respectively provided with a guide hole, a guide rod is matched and penetrated in the guide holes, and the guide rod is fixedly mounted on the frame.

3. The glassine coating device as claimed in claim 1, wherein the rail comprises two parallel slide rails, the front and back sides of the slide rails are recessed towards the inside of the rail to form a limiting groove, the limiting groove is arranged along the length of the slide rails, the upper surface of the mounting plate is recessed downwards to form two sliding grooves, the sliding grooves are matched with the slide rails, the two slide rails are respectively arranged in the two sliding grooves, the inner wall of the sliding grooves is provided with a limiting edge matched with the limiting groove in a protruding manner, and the limiting edge is clamped into the limiting groove.

4. The glassine coating apparatus of claim 3, wherein the first locking mechanism comprises threaded holes on the front and rear side walls of the mounting plate, the threaded holes communicating with corresponding slide grooves, the threaded holes having bolts matching therein, the bolts abutting against corresponding slide rails.

5. The glassine coating device of claim 3, wherein the second locking mechanism comprises a rotating shaft hole vertically penetrating through the mounting plate, the rotating shaft hole is located between the two sliding grooves, the rotating shaft hole is matched with the rotating shaft, the upper surface of the mounting plate is further provided with a mounting groove, the upper end of the rotating shaft hole is communicated with the bottom of the mounting groove, the upper end of the rotating shaft is inserted into the rotating shaft hole, a limiting block is arranged in the mounting groove, the size of the limiting block is larger than that of the rotating shaft hole, the upper end of the rotating shaft is fixedly connected with the limiting block, a threaded portion is arranged on the rotating shaft, a locking nut is arranged on the threaded portion in a matched mode, and the locking nut is located between the mounting frame and the mounting plate.

6. The glassine coating apparatus as claimed in claim 1, wherein the lower end of the drying box body is connected to an exhaust duct, the exhaust duct is connected to a first air pump, the air inlet duct is further provided with a preheating device, the preheating device is disposed on a side of the heating device away from the drying box body, the preheating device comprises a preheating box, the air inlet duct is communicated with the preheating box, the side surfaces of the preheating box, which are perpendicular to the air flow direction, are respectively provided with an air inlet chamber and an air outlet chamber, the exhaust duct is communicated with the air inlet chamber, the air outlet chamber is communicated with an air outlet pipe, the preheating box is provided with a plurality of heat exchange tubes, the length direction of the heat exchange tubes is perpendicular to the air flow direction, and the heat exchange tubes are communicated with the air inlet chamber and the air outlet chamber.

7. The glassine coating apparatus of claim 6, wherein the heat exchange tube has a plurality of first heat-conducting plates and a plurality of second heat-conducting plates disposed therein, the first heat-conducting plates and the second heat-conducting plates being fixedly connected to the inner wall of the heat exchange tube and arranged perpendicular to the longitudinal direction of the heat exchange tube, the plurality of first heat-conducting plates and the plurality of second heat-conducting plates being arranged at intervals along the longitudinal direction of the heat exchange tube, the plurality of first heat-conducting plates and the plurality of second heat-conducting plates being alternately arranged one left and one right inside the heat exchange tube to form a continuous bent air duct extending along the heat exchange tube.