Polyethylene terephthalate (PET) foaming sheet forming device

Abstract

The utility model relates to a PET (Polyethylene Terephthalate) foaming sheet forming device, which belongs to the technical field of plastic production equipment and comprises a cooling device, a round die pre-shaping device and a flat die shaping device which are sequentially arranged from front to back. The cooling device is a cooling air ring; the round die pre-shaping device is provided with a sizing barrel and a cutter; the flat die shaping device is provided with a compression roller, a shaping roller and a cooling roller, the compression roller, the shaping roller and the cooling roller are all driven by a driving device to rotate, and the distance between every two rollers is adjustable; according to the utility model, the outer surface of the foaming sheet is cooled by the cooling device, the foaming sheet is sized and cooled into a cylinder by the round die pre-shaping device, the foaming sheet is cut and flattened by the cutter, and then the flattened foaming sheet is flattened by the flat die shaping device and is further cooled and shaped; according to the utility model, the advantages of round mold foaming and shaping and flat mold foaming and shaping are integrated, and the PET foaming sheet with higher foaming multiplying power, smooth surface and uniform thickness can be produced.

Description

Technical Field

[0001] The utility model relates to a PET foamed sheet forming device, belonging to the technical field of plastic production equipment. Background Art

[0002] At present, the forming methods of PET extruded foamed sheets mostly adopt circular die sizing or flat die sizing. When using circular die sizing, the surface of the produced foamed sheet is uneven and the sheet thickness is not uniform enough; when using flat die production, the higher the foaming ratio at the sheet outlet of the die head, the larger the outlet wave. There will be gas escaping after extrusion by the sizing roller. Although the surface flatness and uniformity are high, it is very difficult to produce high-ratio PET foamed sheets. Content of the Utility Model

[0003] According to the deficiencies in the above prior art, the technical problem to be solved by the utility model is: to provide a PET foamed sheet forming device, which combines the advantages of circular die foaming sizing and flat die foaming sizing, and can produce PET foamed sheets with higher foaming ratio and smoother surface.

[0004] The PET foamed sheet forming device described in the utility model includes a cooling device, a circular die pre-sizing device and a flat die sizing device, which are arranged in sequence from front to back; the cooling device is a cooling air ring, which can cool the outer surface of the extruded PET foamed sheet; the circular die pre-sizing device is provided with a sizing barrel and a cutter. The PET foamed sheet is sized and cooled into a cylindrical shape by the sizing barrel, and then the cylindrical sheet is cut and flattened by the cutter; the flat die sizing device is provided with a pressure roller, a sizing roller and a cooling roller. The pressure roller, the sizing roller and the cooling roller are all driven to rotate by a driving device, and the distance between each roller can be adjusted; the flattened sheet enters between the pressure roller and the sizing roller for flattening, and then is further cooled and sized by the cooling roller.

[0005] The technical solution of the utility model is to provide a PET foamed sheet forming device, which cools the outer surface of the extruded PET foamed sheet through the cooling device, and at the same time, the PET foamed sheet is sized and cooled into a cylindrical shape by the circular die pre-sizing device, and then cut and flattened by the cutter, and then enters the flat die sizing device, where the flattened PET foamed sheet is flattened and further cooled and sized.

[0006] Preferably, both the cooling device and the circular die pre-sizing device are movably arranged on the track, and the flat die sizing device is fixed on the ground.

[0007] Preferably, the axis of the sizing barrel is installed horizontally on the frame of the circular die pre-sizing device, and the cutter is located below the sizing barrel and closely adheres to the side wall of the sizing barrel.

[0008] Preferably, the pressure roller, the shaping roller and the cooling roller are sequentially arranged obliquely from bottom to top on the frame of the flat die shaping device; the pressure roller, the shaping roller and the cooling roller are all connected to the frame through bearing seats, and guide rail slider assemblies are installed below the bearing seats of the pressure roller and the cooling roller. The bearing seats of the pressure roller and the cooling roller are slidably connected to the frame of the flat die shaping device through the guide rail slider assemblies.

[0009] Furthermore, one end of a hydraulic cylinder A is connected below the bearing seat of the pressure roller, and the other end of the hydraulic cylinder A is hinged to the frame of the flat die shaping device; one end of a hydraulic cylinder B is connected above the bearing seat of the cooling roller, and the other end of the hydraulic cylinder B is hinged to the frame of the flat die shaping device.

[0010] Preferably, spacing adjusting elevators are installed on both sides of the bearing seat of the shaping roller, and the spacing between the rollers is adjusted through the spacing adjusting elevators.

[0011] The beneficial effects of the present utility model compared with the prior art are as follows:

[0012] In the PET foam sheet forming device of the present utility model, the outer surface of the extruded PET foam sheet is cooled by a cooling device, and at the same time, the PET foam sheet is sized and cooled into a cylindrical shape by a circular die pre-shaping device. Then, after being cut and flattened by a cutter, it enters the flat die shaping device, and the flattened PET foam sheet is flattened by the flat die shaping device and further cooled and shaped. The present utility model combines the advantages of circular die foam shaping and flat die foam shaping, and can produce PET foam sheets with higher foaming ratio, flat surface and uniform thickness. Description of the Drawings

[0013] Figure 1 is the front view of the present utility model;

[0014] Figure 2 is the top view of the present utility model.

[0015] In the figure: 1. Cooling device; 2. Circular die pre-shaping device; 21. Sizing barrel; 22. Cutter; 3. Track; 4. Flat die shaping device; 41. Hydraulic cylinder A; 42. Pressure roller; 43. Guide rail slider assembly; 44. Spacing adjusting elevator; 45. Hydraulic cylinder B; 46. Cooling roller; 47. Shaping roller; 5. PET foam sheet. Detailed Embodiments

[0016] The present utility model will be further described below in conjunction with specific embodiments.

[0017] However, the description of the present utility model is only an embodiment of structural and functional descriptions. The scope of the rights of the present utility model is not limited by the embodiments described in the text.

[0018] For example, multiple embodiments can have various changes and various forms. It should be understood that the scope of the claims of the present utility model includes equivalents that can implement the technical idea.

[0019] As Figures 1-2 shown, this embodiment is implemented through the following technical solutions: It includes a cooling device 1, a circular die pre-sizing device 2, and a flat die sizing device 4. The cooling device 1, the circular die pre-sizing device 2, and the flat die sizing device 4 are arranged in sequence from front to back; the cooling device 1 is a cooling air ring, which can cool the outer surface of the extruded PET foam sheet; the circular die pre-sizing device 2 is provided with a sizing barrel 21 and a cutter 22. The PET foam sheet is sized and cooled into a cylindrical shape by the sizing barrel 21, and then the cylindrical sheet is cut and flattened by the cutter 22; the flat die sizing device 4 is provided with a pressure roller 42, a sizing roller 47, and a cooling roller 46. The pressure roller 42, the sizing roller 47, and the cooling roller 46 are all driven to rotate by a driving device, and the spacing between each roller can be adjusted; the flattened sheet enters between the pressure roller 42 and the sizing roller 47 for flattening, and then the sheet is further cooled and sized by the cooling roller 46.

[0020] In this embodiment, the cooling device 1 and the circular die pre-sizing device 2 are both movably arranged on the track 3, and the flat die sizing device 4 is fixed on the ground. The axis of the sizing barrel 21 is installed horizontally on the frame of the circular die pre-sizing device 2, and the cutter 22 is located below the sizing barrel 21 and is close to the side wall of the sizing barrel 21. The pressure roller 42, the sizing roller 47, and the cooling roller 46 are arranged obliquely from bottom to top on the frame of the flat die sizing device 4; the pressure roller 42, the sizing roller 47, and the cooling roller 46 are all connected to the frame through bearing seats. A guide rail slider assembly 43 is installed below the bearing seats of the pressure roller 42 and the cooling roller 46, and the bearing seats of the pressure roller 42 and the cooling roller 46 are slidably connected to the frame of the flat die sizing device 4 through the guide rail slider assembly 43. One end of a hydraulic cylinder A41 is connected to the lower part of the bearing seat of the pressure roller 42, and the other end of the hydraulic cylinder A41 is hinged to the frame of the flat die sizing device 4; one end of a hydraulic cylinder B45 is connected to the upper part of the bearing seat of the cooling roller 46, and the other end of the hydraulic cylinder B45 is hinged to the frame of the flat die sizing device 4. Spacing adjustment elevators 44 are installed on both sides of the bearing seat of the sizing roller 47, and the spacing between each roller is adjusted through the spacing adjustment elevators 44.

[0021] The usage method of the present utility model is as follows:

[0022] The extruded PET foamed sheet 5 is sized and cooled by the sizing barrel 21. Meanwhile, the outer surface of the sheet is cooled by the cooling device 1. Then, the cylindrical sheet is cut by the cutter 22. After being cut, the sheet is flattened and enters between the pressing roller 42 and the shaping roller 47. The distances between the pressing roller 42 and the shaping roller 47, and between the cooling roller 46 and the shaping roller 47 are respectively adjusted by the spacing adjusting lift 44 to ensure that the pressing roller 42 and the shaping roller 47 can flatten the sheet, and the cooling roller 46 further cools and shapes the sheet. The pressing roller 42 is pushed by the hydraulic cylinder A 41 to press against the shaping roller 47, and the cooling roller 46 is pushed by the hydraulic cylinder B 45 to press against the shaping roller 47. The three rollers are driven by the driving device to rotate, thereby pulling the PET foamed sheet 5.

[0023] Of course, the above content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples. Equivalent changes and improvements made by those of ordinary skill in the art within the essence of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. A PET foam sheet forming device, characterized in that: The invention comprises a cooling device (1), a circular die pre-forming device (2) and a flat die shaping device (4), wherein the cooling device (1), the circular die pre-forming device (2) and the flat die shaping device (4) are arranged in sequence from front to back; the cooling device (1) is a cooling air ring; the circular die pre-forming device (2) is provided with a sizing barrel (21) and a cutter (22); the flat die shaping device (4) is provided with a pressing roller (42), a shaping roller (47) and a cooling roller (46), wherein the pressing roller (42), the shaping roller (47) and the cooling roller (46) are all driven to rotate by a driving device, and the spacing between the rollers is adjustable.

2. The PET foam sheet forming device according to claim 1, characterized in that: The cooling device (1) and the circular die pre-forming device (2) are both movably arranged on the track (3), and the flat die pre-forming device (4) is fixed on the ground.

3. The PET foam sheet forming device according to claim 1, characterized in that: The axis of the sizing barrel (21) is installed on the frame of the circular die pre-forming device (2) along the horizontal direction, and the cutter (22) is located below the sizing barrel (21) and is close to the side wall of the sizing barrel (21).

4. The PET foam sheet forming device according to claim 1, characterized in that: The pressing roller (42), shaping roller (47) and cooling roller (46) are arranged on the frame of the flat die shaping device (4) in an inclined manner from bottom to top; the pressing roller (42), shaping roller (47) and cooling roller (46) are connected to the frame through bearing seats, and a guide rail slider assembly (43) is installed under the bearing seats of the pressing roller (42) and the cooling roller (46), and the bearing seats of the pressing roller (42) and the cooling roller (46) are slidably connected to the frame of the flat die shaping device (4) through the guide rail slider assembly (43).

5. The PET foam sheet forming device according to claim 4, characterized in that: One end of a hydraulic cylinder A (41) is connected below the bearing seat of the pressure roller (42), and the other end of the hydraulic cylinder A (41) is hinged to the frame of the flat die shaping device (4); one end of a hydraulic cylinder B (45) is connected above the bearing seat of the cooling roller (46), and the other end of the hydraulic cylinder B (45) is hinged to the frame of the flat die shaping device (4).

6. The PET foam sheet forming device according to claim 4, characterized in that: Both sides of the bearing seat of the shaping roller (47) are equipped with spacing adjustment elevators (44) for adjusting the spacing between the rollers.

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