Extrusion blow molding equipment for PFA (Polyfluoroalkoxy) film adhesive tape

Abstract

The utility model discloses PFA (Polyfluoroalkoxy) film adhesive tape extrusion blow molding equipment which comprises an equipment main body, an annular mouth mold is mounted at the bottom end of the equipment main body, a film blank is mounted on the inner side of the annular mouth mold, an air outlet is formed in the bottom end of the film blank, an inner cooling cylinder is mounted at the bottom end of the film blank, and an outer cooling cylinder is mounted at the bottom end of the inner cooling cylinder. A spiral flow guide channel is formed in the outer wall of the inner cooling cylinder, an air blowing pipe is arranged at the top of the inner cooling cylinder, an outer cooling cylinder is installed at the position, on the outer side of the annular opening mold, of the bottom end of the equipment body, and a cooling air cavity is formed in the bottom of the outer cooling cylinder; and air blowing holes are formed in the inner wall of the outer cooling cylinder at the position of the cooling air cavity at equal intervals. According to the cooling device, a cooling mode of combining external cooling and internal cooling is adopted, so that the overall cooling effect of the film bubbles is improved, the film bubbles are favorably shaped, and the cooling efficiency and the quality stability of the PFA film adhesive tape are improved.

Description

Technical Field

[0001] This utility model relates to the field of PFA film tape production technology, specifically a PFA film tape extrusion blow molding equipment. Background Technology

[0002] PFA, as a high-performance fluoroplastic, combines the corrosion resistance of polytetrafluoroethylene (PTFE) with the processing convenience of thermoplastic materials. It is suitable for manufacturing high-temperature and chemically resistant film products. PFA film tape extrusion blow molding is a technology that uses extrusion blow molding to process polytetrafluoroethylene propylene (PFA) resin into films or tapes. Through resin melting and extrusion, blow molding, cooling and shaping, and flattening and winding, the final PFA film tape product is formed.

[0003] Extrusion blow molding is a crucial step, requiring timely cooling and shaping of the expanded film bubble. However, current extrusion blow molding equipment typically only cools from the outside, causing heat to accumulate inside the bubble and making it difficult to dissipate. This results in an unsatisfactory overall cooling effect, hindering bubble shaping and affecting the quality stability of PFA film tape production. Therefore, improvements are urgently needed. Utility Model Content

[0004] The purpose of this invention is to provide a PFA film tape extrusion blow molding equipment to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a PFA film tape extrusion blow molding equipment, comprising a main body, an annular die installed at the bottom of the main body, a film preform installed on the inner side of the annular die, an air outlet at the bottom of the film preform, an inner cooling cylinder installed at the bottom of the film preform, a spiral guide channel on the outer wall of the inner cooling cylinder, a blower pipe on the top of the inner cooling cylinder, an outer cooling cylinder installed at the bottom of the main body outside the annular die, a cooling air cavity at the bottom of the outer cooling cylinder, and blowers with equal spacing on the inner wall of the outer cooling cylinder at the location of the cooling air cavity, the blowers communicating with the cooling air cavity, a cold air treatment box installed on one side of the main body, an air inlet pipe installed on the outer wall of one side of the cold air treatment box, and an air outlet main pipe installed on the outer wall of the other side of the cold air treatment box.

[0006] Preferably, the blower tube is embedded inside the spiral guide channel, and the blower tube has a flat structure.

[0007] Preferably, the interior of the cold air treatment box is provided with a dust removal filter plate, and the bottom end of the dust removal filter plate extends into the first positioning seat at the bottom of the cold air treatment box. The dust removal filter plate removes dust from the gas, reducing dust contamination of the membrane bubble.

[0008] Preferably, the top of the dust removal filter plate passes through the first opening slot at the top of the cold air treatment box and is fixedly connected to the cold air treatment box by bolts. A first sealing gasket is adhered to the inner wall of the first opening slot. The first sealing gasket fits tightly with the dust removal filter plate, which improves the sealing performance between the dust removal filter plate and the first opening slot.

[0009] Preferably, a moisture-absorbing plate is provided inside the cold air treatment box on one side of the dust removal filter plate, and the bottom end of the moisture-absorbing plate extends into the second positioning seat at the bottom of the cold air treatment box, and the moisture-absorbing plate dries the gas.

[0010] Preferably, the top of the moisture-absorbing plate passes through the second opening slot at the top of the cold air treatment box and is fixedly connected to the cold air treatment box by bolts. A second sealing gasket is adhered to the inner wall of the moisture-absorbing plate, and the second sealing gasket is tightly fitted to the moisture-absorbing plate, thereby improving the sealing performance between the moisture-absorbing plate and the second opening slot.

[0011] Preferably, the main air outlet pipe is connected to the blower pipe through the first air guide branch pipe, and the main air outlet pipe is connected to the cooling air cavity through the second air guide branch pipe.

[0012] Preferably, a traction roller is installed at the bottom of the main body of the device to facilitate the traction of the PFA film tape.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] Cooling gas is supplied to the cold air handling box through the air inlet duct. The main air outlet duct delivers the cooling gas to the blower duct through the first air guide branch duct. The blower duct blows out the cooling gas, which exchanges heat with the heat inside the membrane bubble. Since the blower duct is embedded in the spiral guide channel on the outer wall of the inner cooling cylinder, the spiral guide channel guides the gas, causing the gas to swirl inside the membrane bubble, thereby enhancing the heat exchange efficiency. At the same time, the main air outlet duct delivers the cooling gas to the cooling air cavity inside the outer cooling cylinder through the second air guide branch duct. The cooling gas is evenly discharged from the blower holes on the inner wall of the outer cooling cylinder, cooling the inside of the membrane bubble. The combination of external and internal cooling improves the overall cooling effect of the membrane bubble, which is beneficial to the shaping of the membrane bubble, thereby improving the cooling efficiency and quality stability of the PFA film tape. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a partially enlarged structural schematic diagram of the present invention;

[0017] Figure 3 This is a three-dimensional structural diagram of the inner cooling cylinder of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the outer cooling cylinder of this utility model;

[0019] Figure 5 This is an enlarged structural schematic diagram of the cold air handling box of this utility model.

[0020] In the diagram: 1. Main body of the equipment; 2. Annular die; 3. Membrane blank; 4. Inner cooling cylinder; 5. Outer cooling cylinder; 6. Cooling air cavity; 7. Cold air treatment box; 8. Air inlet pipe; 9. Main air outlet pipe; 10. Traction roller; 11. Air outlet; 12. Spiral guide channel; 13. Air blowing pipe; 14. Air blowing hole; 15. First air guide branch pipe; 16. Second air guide branch pipe; 17. First positioning seat; 18. Dust removal filter plate; 19. Second positioning seat; 20. Moisture absorption plate; 21. First opening groove; 22. First sealing gasket; 23. Second opening groove; 24. Second sealing gasket. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figure 1-5 An embodiment of this utility model is provided: a PFA film tape extrusion blow molding equipment, including a main body 1, an annular die 2 installed at the bottom end of the main body 1, a film blank 3 installed on the inner side of the annular die 2, and an air outlet 11 provided at the bottom end of the film blank 3.

[0024] Specifically, PFA resin is heated to a molten state through an extruder to form a uniform melt. The molten material is extruded through an annular die 2 to form a tubular preform 3, which is the initial membrane bubble. Compressed air is introduced into the preform 3, and the gas is blown out from the air outlet 11, causing the membrane bubble to expand laterally to the target diameter. This part is existing technology and therefore will not be described in detail.

[0025] An inner cooling cylinder 4 is installed at the bottom of the preform 3, and a spiral guide channel 12 is provided on the outer wall of the inner cooling cylinder 4. A blower pipe 13 is provided at the top of the inner cooling cylinder 4. An outer cooling cylinder 5 is installed at the bottom of the equipment body 1 outside the annular mold 2, and a cooling air cavity 6 is provided at the bottom of the outer cooling cylinder 5. Equally spaced blower holes 14 are provided on the inner wall of the outer cooling cylinder 5 at the location of the cooling air cavity 6. The blower holes 14 are connected to the cooling air cavity 6.

[0026] Then, cooling gas is delivered into the cold air handling box 7 through the air inlet pipe 8. The air outlet pipe 9 delivers the cooling gas to the inside of the blower pipe 13 through the first air guide branch pipe 15. The blower pipe 13 blows out the cooling gas to exchange heat with the heat inside the membrane bubble. Since the blower pipe 13 is embedded in the spiral guide channel 12 on the outer wall of the inner cooling cylinder 4, the spiral guide channel 12 guides the gas, so that the gas forms a swirling flow inside the membrane bubble, thereby enhancing the heat exchange efficiency.

[0027] Meanwhile, the main air outlet 9 delivers cooling gas to the cooling air chamber 6 inside the outer cooling cylinder 5 through the second air guide branch 16. The cooling gas is evenly discharged from the air blowing holes 14 on the inner wall of the outer cooling cylinder 5 to cool the inside of the membrane bubble. The combination of external and internal cooling improves the overall cooling effect of the membrane bubble, which is conducive to the shaping of the membrane bubble and thus improves the cooling efficiency and quality stability of the PFA film tape.

[0028] A cold air handling box 7 is installed on one side of the main body 1, and an air inlet pipe 8 is installed on the outer wall of one side of the cold air handling box 7, and an air outlet pipe 9 is installed on the outer wall of the other side of the cold air handling box 7.

[0029] The blower tube 13 is embedded inside the spiral guide channel 12, and the blower tube 13 has a flat structure;

[0030] The interior of the cold air handling box 7 is provided with a dust removal filter plate 18, and the bottom end of the dust removal filter plate 18 extends into the first positioning seat 17 at the bottom of the cold air handling box 7.

[0031] The top of the dust removal filter plate 18 passes through the first opening slot 21 at the top of the cold air treatment box 7 and is fixedly connected to the cold air treatment box 7 by bolts. A first sealing gasket 22 is adhered to the inner wall of the first opening slot 21, and the first sealing gasket 22 is tightly attached to the dust removal filter plate 18.

[0032] A moisture-absorbing plate 20 is installed inside the cold air handling box 7 on one side of the dust filter plate 18, and the bottom end of the moisture-absorbing plate 20 extends into the second positioning seat 19 at the bottom of the cold air handling box 7.

[0033] The top of the moisture-absorbing plate 20 passes through the second opening slot 23 at the top of the cold air treatment box 7 and is fixedly connected to the cold air treatment box 7 by bolts. A second sealing gasket 24 is adhered to the inner wall of the second opening slot 23, and the second sealing gasket 24 is tightly attached to the moisture-absorbing plate 20.

[0034] Specifically, the dust removal filter plate 18 removes dust from the gas, reducing dust contamination of the membrane bubble, and the moisture absorption plate 20 dries the gas.

[0035] The main air outlet pipe 9 is connected to the blower pipe 13 through the first air guide branch pipe 15, and the main air outlet pipe 9 is connected to the cooling air cavity 6 through the second air guide branch pipe 16.

[0036] A traction roller 10 is installed at the bottom of the main body 1 of the equipment.

[0037] In this embodiment, the following steps are taken: First, PFA resin is heated to a molten state using an extruder to form a uniform melt. The molten material is extruded through an annular die 2 to form a tubular preform 3, which is the initial membrane bubble. Compressed air is introduced into the preform 3, and the gas is blown out from the air outlet 11, causing the membrane bubble to expand laterally to the target diameter. This part is prior art and will not be described in detail. Then, cooling gas is delivered into the cold air treatment box 7 through the air inlet pipe 8. The dust removal filter plate 18 removes dust from the gas, reducing dust contamination of the membrane bubble, and the moisture absorption plate 20 dries the gas. The main air outlet 9 delivers the cooling gas to the blowing pipe 13 through the first air guide branch pipe 15. The blowing pipe 13 then delivers the cooling gas... The air is blown out and exchanges heat with the inside of the membrane bubble. Since the air blowing pipe 13 is embedded in the spiral guide channel 12 on the outer wall of the inner cooling cylinder 4, the spiral guide channel 12 guides the gas, causing the gas to form a swirling flow inside the membrane bubble, thereby enhancing the heat exchange efficiency. At the same time, the main air outlet 9 delivers the cooling gas to the cooling air cavity 6 inside the outer cooling cylinder 5 through the second air guide branch pipe 16. The cooling gas is evenly discharged from the air blowing hole 14 on the inner wall of the outer cooling cylinder 5 to cool the inside of the membrane bubble. The combination of external and internal cooling improves the overall cooling effect of the membrane bubble, which is beneficial to the shaping of the membrane bubble, thereby improving the cooling efficiency and quality stability of the PFA film tape.

[0038] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A PFA film tape extrusion blow molding equipment, comprising a main body (1), wherein an annular die (2) is installed at the bottom end of the main body (1), a film preform (3) is installed on the inner side of the annular die (2), and an air outlet (11) is provided at the bottom end of the film preform (3), characterized in that, An inner cooling cylinder (4) is installed at the bottom of the preform (3), and a spiral guide channel (12) is provided on the outer wall of the inner cooling cylinder (4). A blower pipe (13) is provided at the top of the inner cooling cylinder (4). An outer cooling cylinder (5) is installed at the bottom of the equipment body (1) outside the annular die (2), and a cooling air cavity (6) is provided at the bottom of the outer cooling cylinder (5). Equally spaced blower holes (14) are provided on the inner wall of the outer cooling cylinder (5) at the location of the cooling air cavity (6). The blower holes (14) are connected to the cooling air cavity (6). A cold air treatment box (7) is installed on one side of the equipment body (1), and an air inlet pipe (8) is installed on the outer wall of one side of the cold air treatment box (7). An air outlet pipe (9) is installed on the outer wall of the other side of the cold air treatment box (7).

2. The PFA film tape extrusion blow molding equipment according to claim 1, characterized in that: The blower tube (13) is embedded inside the spiral guide channel (12), and the blower tube (13) has a flat structure.

3. The PFA film tape extrusion blow molding equipment according to claim 1, characterized in that: The interior of the cold air treatment box (7) is provided with a dust removal filter plate (18), and the bottom end of the dust removal filter plate (18) extends into the first positioning seat (17) at the bottom of the cold air treatment box (7).

4. The PFA film tape extrusion blow molding equipment according to claim 3, characterized in that: The top of the dust removal filter plate (18) passes through the first opening groove (21) at the top of the cold air treatment box (7) and is fixedly connected to the cold air treatment box (7) by bolts. A first sealing gasket (22) is adhered to the inner wall of the first opening groove (21), and the first sealing gasket (22) is tightly attached to the dust removal filter plate (18).

5. The PFA film tape extrusion blow molding equipment according to claim 3, characterized in that: A moisture-absorbing plate (20) is provided inside the cold air treatment box (7) on one side of the dust removal filter plate (18), and the bottom end of the moisture-absorbing plate (20) extends into the second positioning seat (19) at the bottom of the cold air treatment box (7).

6. The PFA film tape extrusion blow molding equipment according to claim 5, characterized in that: The top of the moisture-absorbing plate (20) passes through the second opening groove (23) at the top of the cold air treatment box (7) and is fixedly connected to the cold air treatment box (7) by bolts. A second sealing gasket (24) is adhered to the inner wall of the second opening groove (23), and the second sealing gasket (24) is tightly attached to the moisture-absorbing plate (20).

7. The PFA film tape extrusion blow molding equipment according to claim 1, characterized in that: The main air outlet pipe (9) is connected to the blower pipe (13) through the first air guide branch pipe (15), and the main air outlet pipe (9) is connected to the cooling air cavity (6) through the second air guide branch pipe (16).

8. The PFA film tape extrusion blow molding equipment according to claim 1, characterized in that: The bottom of the main body (1) of the equipment is equipped with a traction roller (10).

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