Drying device for printing and overprinting of PLA (polylactic acid) film

Abstract

The utility model discloses a PLA (polylactic acid) film printing and overprinting drying device, and relates to the technical field of PLA film printing. The PLA film printing and overprinting drying device comprises a processing bottom plate, a drying device is arranged on the processing bottom plate, the drying device comprises a drying unit and an adjusting unit, the drying unit is installed on the adjusting unit, and the drying unit comprises an upper rotating roller and a lower rotating roller which are located at the upper position and the lower position of the adjusting unit respectively; the same sides of the upper rotating roller and the lower rotating roller are correspondingly connected with rotating shafts respectively, the two rotating shafts communicate with the same U-shaped pipe, and the other end of the U-shaped pipe is connected with a hot air pipe. High-temperature hot air is filled into the upper rotating roller and the lower rotating roller through the hot air pipe arranged in the drying unit, so that the temperature of the upper rotating roller and the temperature of the lower rotating roller are increased, contact with the PLA film is completed when the PLA film is wound after being printed and overprinted, the two ends of the PLA film are dried, and the drying efficiency and the energy utilization rate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of PLA film printing, in particular to a PLA film printing overprinting and drying device. Background Art

[0002] In the existing technology, when drying the film, the drying device for overprinting film printing needs to use a winding structure to roll up the overprinted film and dry it during the winding process. However, since the thickness of the winding drum becomes thicker and thicker during the winding process, the height of the film moved out of the drying equipment after drying is different. The existing drying equipment is provided with large openings at the front and rear ends for the film to move, but the large openings cause the heat inside the drying equipment to flow out, thereby reducing the drying efficiency of the film and reducing the practicality and functionality of the drying device.

[0003] For example, a drying device for film printing disclosed in Chinese patent publication number CN217145337U, the drying device is designed with a slot, a movable plate, a slide groove, a center groove, a limit seat, an internal thread, a connecting rod, a screw and a motor. Notches are provided at the front and rear ends of the drying box, a slot is provided inside the notch at the front end, a movable plate is installed inside the slot, a center groove is provided in the middle of the movable plate, slide grooves are provided on both sides of the front end of the drying box, limit seats are fixedly installed at the four corners of the front end of the movable plate, internal threads are provided inside the two right limit seats, connecting rods are installed inside the left limit seat, and screws are installed inside the right limit seat. The dried film passes through the center groove and is wound by a winding drum. The center groove can adjust the height through the rear end of the film outside the winding drum, thereby improving the sealing inside the drying box, increasing the temperature inside the drying box, and improving the drying effect of the film, thereby effectively improving the practicability and functionality of the drying device.

[0004] First, the drying of the above-mentioned device completes the drying of the PLA film through the high temperature inside the drying box, and the technical solution is also centered on improving the sealing of the drying box to prevent the leakage of hot air. At present, after the PLA film is modified with montmorillonite, the stability of its polylactic acid molecular chain is enhanced and it can withstand high temperatures above 110 degrees. Therefore, when drying the modified PLA film, direct contact can be adopted instead of the above solution to better improve the drying efficiency. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a PLA film printing overprint drying device, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a PLA film printing overprint drying device, comprising a processing base plate, a drying device is arranged on the processing base plate, the drying device comprises a drying unit and an adjusting unit, the drying unit is installed on the adjusting unit, the adjusting unit is installed on the processing base plate, the drying unit comprises an upper rotating roller and a lower rotating roller respectively arranged at the upper and lower positions of the adjusting unit, the upper rotating roller and the lower rotating roller are respectively connected to a rotating shaft on the same side, the two rotating shafts are connected to the same U-shaped tube, the other end of the U-shaped tube is connected to a hot air pipe, the upper rotating roller, the lower rotating roller and the two rotating shafts are all hollow tubes, and seals are arranged at the connection between the upper rotating roller and the lower rotating roller and the rotating shaft.

[0007] The utility model fills high-temperature hot air into the upper roller and the lower roller through the hot air duct arranged in the drying unit, thereby increasing the temperature of the upper roller and the lower roller, thereby completing the contact with the PLA film when the PLA film is rolled up after the overprinting is completed, so that both ends of the PLA film are dried, thereby improving the drying efficiency and energy utilization.

[0008] It should be noted that the current PLA film has strong thermal stability, with a decomposition temperature range of 331°C to 376°C and a deformation temperature of 110°C or above. Therefore, in the actual drying process, the hot air with appropriate temperature should be selected according to the model of PLA film, such as 5C, 5M and 5MMT.

[0009] A further improvement of the technical solution of the utility model is that the upper rotating roller and the lower rotating roller are rotatably connected to two rotating shafts respectively, the rotating shaft is detachably connected to the U-shaped tube through a seal, and the U-shaped tube is welded to the hot air tube.

[0010] The further improvement of the technical solution of the utility model is that friction patterns are arranged in an array on the upper roller and the lower roller, and air dispersion holes are arranged in an array on the axis of the two rotating shafts located inside the upper roller and the lower roller. The friction patterns can increase the friction between the upper roller and the lower roller. When the PLA film is rolled up, the lower roller rotates under the action of the adjustment unit, and the upper roller rotates automatically under the action of the friction force and the thrust generated by the movement of the PLA film. Multiple groups of air dispersion holes improve the preheating efficiency.

[0011] A further improvement of the technical solution of the utility model is that the adjustment unit includes drying frames symmetrically placed vertically on both sides of the processing base plate, and mounting blocks are respectively arranged at the upper and lower ends of the mounting grooves arranged in the two drying frames, each of the rotating shafts is arranged in the mounting blocks, and the ends of the upper rotating roller and the lower rotating roller away from the rotating shaft are respectively fixedly connected with connecting shafts, each of the connecting shafts is rotatably connected to the corresponding mounting block, and the other end of the connecting shaft connected to the lower rotating roller is connected to the driving motor through a coupling.

[0012] The further improvement of the technical solution of the utility model is that: the two upper mounting blocks are connected with adjusting screws through bearings, the adjusting screws are threadedly connected with the drying frame through internal threads, and a telescopic rod is fixedly connected between the two mounting blocks on the same side, and a reset spring is sleeved on the two telescopic rods. The utility model adjusts the position of the upper mounting block in the mounting groove by rotating the adjusting screw, thereby changing the distance between the upper rotating roller and the lower rotating roller, so that the device can be compatible with PLA films of different thicknesses and models, and the lower rotating roller can effectively increase the PLA film winding speed during the rotation process, so that the device is practical.

[0013] A further improvement of the technical solution of the utility model is that: a mounting partition is symmetrically arranged on one side of the drying frame, and a winding assembly is installed on the mounting partition.

[0014] Beneficial Effects

[0015] The utility model provides a PLA film printing overprint drying device. Compared with the prior art, it has the following beneficial effects:

[0016] 1. The PLA film printing overprint drying device fills high-temperature hot air into the upper roller and the lower roller through the hot air pipe arranged in the drying unit, thereby increasing the temperature of the upper roller and the lower roller, thereby completing the contact of the PLA film when the PLA film is rolled up after the printing overprint is completed, so that both ends of the PLA film are dried, thereby improving the drying efficiency and energy utilization.

[0017] 2. The PLA film printing, overprinting and drying device adjusts the position of the upper mounting block in the mounting groove by adjusting the rotation of the screw rod, thereby changing the distance between the upper rotating roller and the lower rotating roller, so that the device can be compatible with PLA films of different thicknesses and models, and the arranged lower rotating roller can effectively increase the PLA film winding speed during the rotation process, making the device practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the drying unit of the utility model;

[0020] Figure 3 It is a schematic diagram of the regulating unit of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the utility model in a front view.

[0022] In the figure: 1. Processing bottom plate; 201. Upper rotating roller; 202. Lower rotating roller; 203. Rotating shaft; 204. U-shaped tube; 205. Hot air tube; 206. Friction pattern; 207. Air holes; 301. Drying frame; 302. Mounting block; 303. Connecting shaft; 304. Driving motor; 305. Adjusting screw; 306. Telescopic rod; 307. Return spring; 308. Winding assembly. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides two technical solutions:

[0025] Figure 1-3 The first embodiment is shown: a PLA film printing overprint drying device, comprising a processing base plate 1, a drying device is arranged on the processing base plate 1, the drying device comprises a drying unit and an adjusting unit, the drying unit is mounted on the adjusting unit, and the adjusting unit is mounted on the processing base plate 1;

[0026] The drying unit includes an upper rotating roller 201 and a lower rotating roller 202 which are respectively arranged at the upper and lower positions of the adjusting unit. The upper rotating roller 201 and the lower rotating roller 202 are respectively connected to a rotating shaft 203 on the same side. The two rotating shafts 203 are connected to the same U-shaped tube 204. The other end of the U-shaped tube 204 is connected to the hot air pipe 205. The upper rotating roller 201, the lower rotating roller 202 and the two rotating shafts 203 are all hollow tubes. Seals are provided at the connection between the upper rotating roller 201 and the lower rotating roller 202 and the rotating shaft 203.

[0027] The utility model fills high-temperature hot air into the upper roller 201 and the lower roller 202 through the hot air pipe 205 provided in the drying unit, thereby increasing the temperature of the upper roller 201 and the lower roller 202, thereby completing the contact with the PLA film when the PLA film is rolled up after the overprinting is completed, so that both ends of the PLA film are dried, thereby improving the drying efficiency and energy utilization.

[0028] It should be noted that the current PLA film has strong thermal stability, with a decomposition temperature range of 331°C to 376°C and a deformation temperature of 110°C or above. Therefore, in the actual drying process, the hot air with appropriate temperature should be selected according to the model of PLA film, such as 5C, 5M and 5MMT.

[0029] The upper rotating roller 201 and the lower rotating roller 202 are rotatably connected to two rotating shafts 203 respectively. The rotating shaft 203 is detachably connected to the U-shaped tube 204 through a seal. The U-shaped tube 204 is welded to the hot air tube 205.

[0030] The upper roller 201 and the lower roller 202 are both arranged with friction patterns 206 in an array, and the two rotating shafts 203 are located inside the upper roller 201 and the lower roller 202, and the air dispersion holes 207 are arranged in an array on the axis. The friction patterns 206 can increase the friction between the upper roller 201 and the lower roller 202. When the PLA film is rolled up, the lower roller 202 rotates under the action of the adjustment unit, and the upper roller 202 rotates automatically under the action of the friction force and the thrust generated by the movement of the PLA film. The multiple air dispersion holes 207 improve the preheating efficiency.

[0031] Figure 1-2 4 shows a second embodiment, which mainly differs from the first embodiment in that the adjustment unit includes drying frames 301 symmetrically and vertically placed on both sides of the processing base plate 1, and mounting blocks 302 are respectively arranged at the upper and lower ends of the mounting grooves arranged in the two drying frames 301, and each rotating shaft 203 is arranged in the mounting block 302, and the ends of the upper rotating roller 201 and the lower rotating roller 202 away from the rotating shaft 203 are respectively fixedly connected with the connecting shaft 303, and each connecting shaft 203 is rotatably connected to the corresponding mounting block 302, and the other end of the connecting shaft 303 connected to the lower rotating roller 202 is connected to the driving motor 304 through a coupling.

[0032] The two upper mounting blocks 302 are connected with adjusting screws 305 through bearings, and the adjusting screws 305 are threadedly connected with the drying frame 301 through internal threads. A telescopic rod 306 is fixedly connected between the two mounting blocks 302 on the same side, and a return spring 307 is sleeved on the two telescopic rods 306. The utility model adjusts the position of the upper mounting block 302 in the mounting groove by rotating the adjusting screw 305, thereby changing the distance between the upper rotating roller 201 and the lower rotating roller 202, so that the device can be compatible with PLA films of different thicknesses and models, and the lower rotating roller 202 can effectively increase the PLA film winding speed during the rotation process, so that the device is practical. In particular, the direction of rotation of the driving motor 304 is the same as the winding direction of the PLA film.

[0033] A mounting partition is symmetrically provided on one side of the drying frame 301, and a winding assembly 308 is installed on the mounting partition.

[0034] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used.

[0035] When in use, fix one end of the PLA film on the winding assembly, and before gradually rotating the winding assembly 308, turn on the hot air device to allow hot air to enter the hot air pipe 205, and the U-shaped tube 204 transmits the hot air to the rotating shaft 203. The air dissipation holes 207 of the rotating shaft 203 cause the temperature of the upper rotating roller 201 and the lower rotating roller 202 to rise. Then, according to the model of the PLA film, rotate the adjusting screw 305, adjust the upper rotating roller 201 at the upper end to a suitable position, start the driving motor 304 and rotate the winding assembly 308, and complete the drying operation on both sides of the PLA film during the rolling process.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PLA film printing overprint drying device, comprising a processing base plate (1), characterized in that: The processing base plate (1) is provided with a drying device, the drying device comprising a drying unit and an adjusting unit, the drying unit is mounted on the adjusting unit, and the adjusting unit is mounted on the processing base plate (1); The drying unit comprises an upper rotating roller (201) and a lower rotating roller (202) which are respectively arranged at upper and lower positions of the adjusting unit; a rotating shaft (203) is respectively connected to the same side of the upper rotating roller (201) and the lower rotating roller (202); the two rotating shafts (203) are both connected to the same U-shaped tube (204); the other end of the U-shaped tube (204) is connected to a hot air tube (205); the upper rotating roller (201), the lower rotating roller (202) and the two rotating shafts (203) are all hollow tubes; sealing members are provided at the connection between the upper rotating roller (201) and the lower rotating roller (202) and the rotating shaft (203).

2. A PLA film printing overprint drying device according to claim 1, characterized in that: The upper rotating roller (201) and the lower rotating roller (202) are rotatably connected to two rotating shafts (203) respectively; the rotating shaft (203) is detachably connected to a U-shaped tube (204) via a seal; and the U-shaped tube (204) is welded to a hot air tube (205).

3. A PLA film printing overprint drying device according to claim 1, characterized in that: The upper rotating roller (201) and the lower rotating roller (202) are both provided with friction patterns (206) arranged in an array, and the two rotating shafts (203) are provided with air dispersion holes (207) arranged in an array on the axes located inside the upper rotating roller (201) and the lower rotating roller (202).

4. A PLA film printing overprint drying device according to claim 1, characterized in that: The adjustment unit comprises drying frames (301) symmetrically and vertically placed on both sides of the processing base plate (1); mounting blocks (302) are respectively arranged at the upper and lower ends of the mounting grooves arranged in the two drying frames (301); each of the rotating shafts (203) is arranged in the mounting blocks (302); one end of the upper rotating roller (201) and the lower rotating roller (202) away from the rotating shaft (203) is respectively fixedly connected with a connecting shaft (303); each of the connecting shafts (303) is rotatably connected to the corresponding mounting block (302); and the other end of the connecting shaft (303) connected to the lower rotating roller (202) is connected to a driving motor (304) via a coupling.

5. A PLA film printing overprint drying device according to claim 4, characterized in that: The two upper mounting blocks (302) are connected to adjusting screws (305) via bearings, and the adjusting screws (305) are threadedly connected to the drying frame (301) via internal threads. A telescopic rod (306) is fixedly connected between the two mounting blocks (302) on the same side, and the two telescopic rods (306) are sleeved with return springs (307).

6. A PLA film printing overprint drying device according to claim 5, characterized in that: A mounting partition is symmetrically arranged on one side of the drying frame (301), and a winding assembly (308) is mounted on the mounting partition.

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