Air knife auxiliary cooling equipment for forming PETG (polyethylene terephthalate glycol) heat shrinkage film casting piece

Abstract

The utility model discloses air knife auxiliary cooling equipment for forming a PETG (polyethylene terephthalate glycol) heat shrinkage film casting piece, and particularly relates to the technical field of plastic film forming, the air knife auxiliary cooling equipment comprises a support frame, one end of the support frame is connected with a cold drum, one side of the cold drum is provided with an air knife body, the bottom of the air knife body is provided with a limiting clamping block, and the limiting clamping block is connected with the air knife body. A mounting plate is arranged at the bottom of the air knife body, a limiting sliding groove is formed in the surface of the mounting plate, and a circulating cooling mechanism is arranged on the outer side of the cold drum. The annular protrusion is installed on the outer side of the cold drum, the annular protrusion is communicated with the interlayer in the cold drum, the draught fan is started to drive natural air to enter the air inlet pipe, the natural air can be cooled by the refrigerating machine, and therefore the effect that cold air cools the outer surface of the cold drum after entering the cold drum is achieved. And the characteristic that the sheets are heated unevenly is avoided, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic film molding, and more specifically to an air knife auxiliary cooling device used for PETG heat shrinkable film casting molding. Background Art

[0002] PETG heat shrinkable film is mainly used as heat shrinkable label, and basically adopts casting + electrostatic adsorption casting method. When casting, the high-temperature melt is cast onto the smooth, low-temperature, high-speed rotating cold drum surface, and then adheres to the cold drum surface by electrostatic adsorption force, and is cooled to form a uniform thick sheet that meets the requirements of subsequent stretching process. However, some special varieties of PETG heat shrinkable film, such as wine bottle sleeve label film and other products, are thicker, at 70-80μm. When using the single drum-electrostatic adsorption casting method to produce such products, it is easy to produce the problem of uneven performance inside and outside the film. This is because during the casting process, the inner layer of the thin film is close to the cold drum (low temperature), while the outer layer is in contact with the air. The thermal conductivity of the PETG material is poor, resulting in inconsistent cooling rates inside and outside the thin film, which in turn causes certain performance differences in the longitudinal direction of the final formed film.

[0003] The utility model patent with patent publication number CN201921560182.2 discloses an air knife assisted cooling device for PETG heat shrink film casting and forming. By adding a set of equipment with cooling and pressurizing attached sheet functions on the basis of the original single drum-electrostatic adsorption casting and forming device, it can well assist in cooling and pressurizing the thin film cooled on the cold drum, and effectively improve the quality of the final formed film.

[0004] However, when this structure is actually used, the auxiliary cooling of the sheet is only achieved by cooling it with an air knife, so that only the outer surface of the sheet can be cooled, but the surface on the side where the sheet is in contact with the cold drum cannot be cooled, which results in uneven heating on both sides of the sheet and poor cooling effect. Utility Model Content

[0005] In order to overcome the above defects of the prior art, the utility model provides an air knife auxiliary cooling device for PETG heat shrinkable film casting to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air knife-assisted cooling device for PETG heat shrinkable film casting, comprising a support frame, one end of the support frame is connected to a cold drum, an air knife body is provided on one side of the cold drum, a limit block is provided at the bottom of the air knife body, a mounting plate is provided at the bottom of the air knife body, a limit slide groove is provided on the surface of the mounting plate, and a circulating cooling mechanism is provided on the outer side of the cold drum.

[0007] Preferably, the circulating cooling mechanism includes an annular protrusion, which is arranged at both ends of the cold drum, a interlayer is arranged inside the cold drum, the annular protrusion is clamped with the cold drum, an air intake pipe is arranged on the outside of the annular protrusion, a refrigerator is arranged on the outside of the air intake pipe, a fan is arranged on the outside of the air intake pipe, a mounting frame is arranged on the outside of the support frame, the mounting frame is arranged on the outside of the refrigerator, and the mounting frame is detachably connected to the refrigerator.

[0008] Through the above scheme, it can be seen that the annular protrusion is connected with the internal movable clamp of the cold drum, and then the air inlet pipe is connected with the annular protrusion, the fan is started, and air is introduced into the air inlet pipe through the fan, and then the gas passes through the refrigerator before entering the inside of the annular protrusion. The refrigerator cools the gas, and then the cooled gas enters the interlayer inside the cold drum, and the interlayer is connected to the connecting port, and then the surface of the connecting port radiates low-temperature gas to cool the surface of the sheet close to the cold drum, thereby improving the practicability of the device.

[0009] Preferably, the surface of the cold drum is provided with connecting holes, the number of which is set to be several, the connecting holes are communicated with the interlayer, the top of the air knife body is provided with a rack, the rack is movably connected to the air knife body, the top of the air knife body is provided with a fixed frame, a rotating gear is provided inside the fixed frame, a placement frame is provided on one side of the fixed frame, the placement frame is fixedly connected to the fixed frame, a motor is provided inside the placement frame, and the output end of the motor is coaxially connected to the rotating gear.

[0010] Through the above scheme, it can be seen that the motor is used to drive the rack to rise and fall inside the air knife body, so as to control the air knife wind speed, and avoid the sheet being blown off from the outer surface of the cold drum due to excessive wind speed. When the bottom of the rack seals the internal space of the air knife body, closing the air knife body can realize dust prevention for the interior of the air knife body by the bottom end of the rack, and prevent large particles from entering the air knife body and then being blown onto the sheet on the surface of the cold drum, thereby improving the practicability of the device.

[0011] Technical effects and advantages of the utility model:

[0012] 1. By setting a circulating cooling mechanism, compared with the prior art, the annular protrusion is connected to the inner movably of the cold drum, and then the air inlet pipe is connected to the annular protrusion, and the fan is started to let air into the air inlet pipe through the fan, and then the gas passes through the refrigerator before entering the inside of the annular protrusion, and the refrigerator cools the gas, and then the cooled gas enters the interlayer inside the cold drum, and the interlayer is connected to the connection port, and then the surface of the connection port radiates low-temperature gas to cool the surface of the sheet close to the cold drum, thereby improving the practicality of the device;

[0013] 2. By setting a rack and a rotating gear, the motor is used to drive the rack to rise and fall inside the air knife body, so as to control the wind speed of the air knife and prevent the sheet from being blown off the outer surface of the cold drum due to excessive wind speed. When the bottom of the rack seals the internal space of the air knife body, the air knife body can be closed to prevent the bottom of the rack from dust inside the air knife body, so as to prevent large particles from entering the air knife body and then being blown onto the sheet on the surface of the cold drum, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a right side structural schematic diagram of the utility model.

[0016] Figure 3 It is a left-side structural schematic diagram of the utility model.

[0017] Figure 4 It is a schematic diagram of the annular protrusion structure of the utility model.

[0018] Figure 5 It is a schematic diagram of the sandwich structure of the utility model.

[0019] Figure 6 This is a schematic diagram of the structure of the air knife body and the mounting plate of the utility model.

[0020] The accompanying drawings are marked as follows: 1. support frame; 2. cold drum; 3. air knife body; 4. limit block; 5. mounting plate; 6. limit slide groove; 7. annular protrusion; 8. interlayer; 9. air inlet pipe; 10. refrigerator; 11. fan; 12. mounting frame; 13. connecting hole; 14. rack; 15. fixing frame; 16. rotating gear; 17. placement frame; 18. motor. DETAILED DESCRIPTION

[0021] 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.

[0022] As attached Figure 1-6The shown embodiment is an air knife assisted cooling device for PETG heat shrinkable film casting, comprising a support frame 1, one end of the support frame 1 is connected to a cold drum 2, one side of the cold drum 2 is provided with an air knife body 3, the bottom of the air knife body 3 is provided with a limit block 4, the bottom of the air knife body 3 is provided with a mounting plate 5, the surface of the mounting plate 5 is provided with a limit slide groove 6, and the outer side of the cold drum 2 is provided with a circulating cooling mechanism.

[0023] As attached Figure 1-4 As shown, the circulating cooling mechanism includes an annular protrusion 7, which is arranged at both ends of the cold drum 2, and an interlayer 8 is arranged inside the cold drum 2. The annular protrusion 7 is clamped with the cold drum 2, and an air inlet pipe 9 is arranged on the outside of the annular protrusion 7. A refrigerator 10 is arranged on the outside of the air inlet pipe 9, and a fan 11 is arranged on the outside of the air inlet pipe 9. A mounting frame 12 is arranged on the outside of the support frame 1, and the mounting frame 12 is arranged on the outside of the refrigerator 10. The mounting frame 12 and the refrigerator 10 are detachably connected, so that the annular protrusion 7 is installed on the outside of the cold drum 2, and the annular protrusion 7 is communicated with the interlayer 8 inside the cold drum 2. The fan 11 is started to drive natural wind into the inside of the air inlet pipe 9, and the natural wind will be cooled by the refrigerator 10, so as to achieve the effect of cooling the outer surface of the cold drum 2 after the cold wind enters the cold drum 2, avoiding the characteristic of uneven heating of the sheet material, and improving the practicality of the device.

[0024] As attached Figure 1-5 As shown, the surface of the cold drum 2 is provided with connecting holes 13, the number of which is set to be several, the connecting holes 13 are communicated with the interlayer 8, the top of the air knife body 3 is provided with a rack 14, the rack 14 is movably connected to the air knife body 3, the top of the air knife body 3 is provided with a fixed frame 15, the interior of the fixed frame 15 is provided with a rotating gear 16, one side of the fixed frame 15 is provided with a placement frame 17, the placement frame 17 is fixedly connected to the fixed frame 15, the interior of the placement frame 17 is provided with a motor 18, the output end of the motor 18 is coaxially connected to the rotating gear 16, so that the motor 18 can drive the rotating gear 16 to rotate, so that the rotating gear 16 drives the rack 14 to rise and fall inside the air knife body 3, completing the opening and sealing state of the inner cavity of the air knife body 3, thereby realizing the control of the wind speed inside the air knife body 3, and protecting the inside of the air knife body 3 when the air knife body 3 stops being used, thereby improving the practicability of the device.

[0025] Working principle of the utility model: when the device is in use, when the sheet is located on the surface of the cold drum 2, the air knife body 3 performs cold treatment on the outer surface of the sheet, and at the same time improves the connection strength between the sheet and the cold drum 2 (this is a prior art solution and will not be elaborated on in detail), and then the fan 11 is started to introduce natural wind into the interior of the air inlet pipe 9. When the natural wind enters the interior of the air inlet pipe 9, it will pass through the interior of the refrigerator 10 along the air inlet pipe 9. At this time, the refrigerator 10 will cool the natural wind, and the treated natural wind will enter the interior of the cold drum 2, thereby achieving cooling treatment on the outer surface of the cold drum 2, and then completing the cooling of the surface of the sheet close to the cold drum 2, thereby improving the practicality of the device.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air knife assisted cooling device for PETG heat shrinkable film casting, comprising a support frame (1), characterized in that: One end of the support frame (1) is connected to a cold drum (2), one side of the cold drum (2) is provided with an air knife body (3), the bottom of the air knife body (3) is provided with a limit block (4), the bottom of the air knife body (3) is provided with a mounting plate (5), the surface of the mounting plate (5) is provided with a limit slide groove (6), and the outer side of the cold drum (2) is provided with a circulating cooling mechanism.

2. The air knife assisted cooling device for PETG heat shrinkable film casting according to claim 1, characterized in that: The circulating cooling mechanism comprises an annular protrusion (7), the annular protrusion (7) being arranged at both ends of the cold drum (2), an interlayer (8) being arranged inside the cold drum (2), the annular protrusion (7) being clamped with the cold drum (2), an air intake pipe (9) being arranged outside the air intake pipe (9), a refrigerator (10) being arranged outside the air intake pipe (9), a fan (11) being arranged outside the air intake pipe (9), a mounting frame (12) being arranged outside the refrigerator (10), and the mounting frame (12) being detachably connected to the refrigerator (10).

3. The air knife assisted cooling device for PETG heat shrinkable film casting according to claim 1, characterized in that: The surface of the cold drum (2) is provided with connection holes (13), the number of the connection holes (13) is set to be a plurality, and the connection holes (13) are in communication with the interlayer (8).

4. The air knife assisted cooling device for PETG heat shrinkable film casting according to claim 1, characterized in that: A rack (14) is provided on the top of the air knife body (3), and the rack (14) is movably connected to the air knife body (3).

5. The air knife assisted cooling device for PETG heat shrinkable film casting according to claim 1, characterized in that: A fixing frame (15) is provided on the top of the air knife body (3), a rotating gear (16) is provided inside the fixing frame (15), a placement frame (17) is provided on one side of the fixing frame (15), and the placement frame (17) is fixedly connected to the fixing frame (15).

6. The air knife assisted cooling device for PETG heat shrinkable film casting according to claim 5, characterized in that: A motor (18) is provided inside the placement frame (17), and an output end of the motor (18) is coaxially rotatably connected to the rotating gear (16).

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