A polyurethane film forming and extending temperature control device

Abstract

The present invention belongs to the technical field of polyurethane film processing, and discloses a polyurethane film generation, extension and temperature control device, comprising a conveying roller for conveying the polyurethane film, a distributed heating plate for heating the polyurethane film at the conveying roller, and an extension roller for extending the heated polyurethane film. The device also comprises: a return sleeve having a receiving hole through which the stretched polyurethane film is conveyed; an ion air path connected to the receiving hole to guide the ion wind into contact with the polyurethane film; ions carried in the ion wind are equally neutralized with the static charge on the surface of the polyurethane film, thereby eliminating static electricity. The present invention sprays uniform ion wind through the ion wind path within the return sleeve to achieve equal neutralization of the static charge on the surface of the film material, and combines the symmetrical suction of the dust collection air paths on both sides to effectively capture and release dust, avoiding secondary pollution caused by airflow turbulence. The array of spray holes in the ion wind sleeve further improves the uniformity of ion coverage.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane film processing, in particular to a polyurethane film generating, extending and temperature controlling device. Background Art

[0002] Due to its excellent mechanical properties, weather resistance and processability, polyurethane film is widely used in flexible electronics, medical packaging, smart materials and other fields. In the polyurethane film production process, stretching molding and temperature control are the core links that determine the mechanical properties and surface quality of the film material. Existing technologies usually use distributed heating devices to achieve molecular chain orientation control and cooperate with multi-stage roller groups for mechanical stretching.

[0003] However, in actual production, it was found that the contact and friction between the film material and the roller during the stretching process will generate a large amount of static electricity. Especially under drying conditions, the surface static voltage can reach thousands of volts. The residual static electricity will cause adhesion between the film layers in the subsequent slitting and winding processes, directly affecting the product yield. Traditional solutions often use external ion fans for local static neutralization. However, this method has problems such as uneven ion coverage and low neutralization efficiency. In addition, the airflow during the static electricity removal process will also generate dust particles, causing the stretched film material to still absorb dust particles.

[0004] Therefore, a polyurethane film forming and stretching temperature control device is proposed to solve the above-mentioned problem. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a polyurethane film forming and stretching temperature control device.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a polyurethane film forming, stretching and temperature control device, comprising a conveying roller for conveying the polyurethane film, a distributed heating plate for heating the polyurethane film at the conveying roller, and a stretching roller for stretching the heated polyurethane film, and further comprising:

[0007] The return sleeve has a receiving hole, and the stretched polyurethane film is conveyed through the receiving hole;

[0008] The ion wind path is connected with the receiving hole and guides the ion wind to contact the polyurethane membrane;

[0009] The ions carried by the ion wind neutralize the static charge on the surface of the polyurethane membrane in equal amounts, eliminating static electricity;

[0010] The dust collection air path is arranged on both sides of the return sleeve along the conveying direction of the polyurethane film;

[0011] After the ion wind contacts the polyurethane film, it flows along both sides of the receiving hole and enters the dust collection air path.

[0012] In the above technical solution, preferably, it also includes a heat exchange tube, which is provided with an air inlet end and an air outlet end. The air inlet end is connected to the dust suction air path, and the air outlet end is connected to a cold flow pipe. The cold flow pipe is sleeved on the outside of the ion air path. A refrigeration plate is provided in the heat exchange tube, which is cooled by the refrigeration end of the refrigeration plate along with the dust suction air flow, and circulates in the cold flow pipe for heat conduction cooling of the ion air flow circulating inside the ion air path.

[0013] In the above technical solution, preferably, it also includes a partition, which is arranged in the heat exchange cylinder to separate the heat exchange cylinder into a cold chamber and a hot chamber. The refrigeration plate is arranged through the partition, and its cooling end and heating end are respectively located in the cold chamber and the hot chamber. The air inlet end is connected to the cold chamber and the hot chamber, and the air outlet end includes a cold flow end and a hot flow end respectively connected to the cold chamber and the hot chamber, and the cold flow end is connected to the cold flow pipe.

[0014] In the above technical solution, preferably, it also includes a preheating sleeve, which has a through hole, and the stretched polyurethane film is transported through the through hole. The preheating sleeve is connected to the hot flow end, and the preheating sleeve is provided with a hot hole for spraying hot air flow toward the polyurethane film.

[0015] In the above technical solution, preferably, the ion air path includes:

[0016] A fixed sleeve with a hollow interior;

[0017] The ion fan is connected to the fixed sleeve and generates ion wind to be diverted into the fixed sleeve;

[0018] The ion wind sleeve has two ends respectively connected to the fixing sleeve and the receiving hole;

[0019] It flows along with the ion wind through the ion wind sleeve to the receiving hole and is ejected to contact the polyurethane membrane.

[0020] In the above technical solution, preferably, the ion wind sleeve includes:

[0021] a heat exchange tube, connected to the fixed sleeve;

[0022] The other end of the cold flow pipe is arranged on the fixed sleeve and is located outside the heat exchange pipe, and the end of the cold flow pipe is connected to the exhaust pipe;

[0023] The guide pipe has two ends connected to the heat exchange pipe and the receiving hole respectively;

[0024] The receiving holes include spray holes arranged in an array, and the ion wind flow is sprayed from the spray holes to the surface of the polyurethane film.

[0025] In the above technical solution, preferably, the dust suction air duct includes:

[0026] The dust collection mouth is located on both sides of the circular sleeve;

[0027] A filter tube is connected to the dust collection nozzle;

[0028] An axial flow fan is connected to the filter tube.

[0029] In the above technical solution, preferably, the filter tube includes a filter inner cylinder and a filter outer cylinder sleeved outside the filter inner cylinder, the filter inner cylinder is connected to the suction side of the axial flow fan, and the filter outer cylinder is connected to the dust suction port sleeve.

[0030] In the above technical solution, preferably, the inner filter cylinder and the outer filter cylinder are connected to the same grounding wire.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention sprays uniform ion wind through the ion wind path in the circular sleeve to achieve equal neutralization of the static charge on the surface of the membrane material. Combined with the symmetrical suction of the dust suction wind paths on both sides, it effectively captures the detached dust and avoids secondary pollution caused by air flow turbulence. The array nozzles of the ion wind sleeve further improve the uniformity of ion coverage.

[0033] The dust collection airflow passes through the nested structure of the inner and outer filter cylinders, and is combined with a shared ground wire design to intercept dust particles of different sizes in different stages, while preventing static electricity from accumulating and entering the subsequent airflow, ensuring a clean circulation of the airflow. The subsequent airflow is combined with the heat exchange cylinder to divide the purified airflow into two separate cold and hot paths for separate utilization.

[0034] The purified airflow is cooled by structures such as heat exchange cylinders, refrigeration plates, and cold flow tubes. The low-temperature airflow in the cold cavity is wrapped around the outside of the ion air path through the cold flow tube. The ion airflow in the ion air path is cooled by conduction and convection, ensuring that the ion air is at a suitable temperature before being sprayed onto the surface of the polyurethane membrane. This can shorten the neutralization time of the static voltage on the polyurethane membrane and reduce the residual charge on the surface of the polyurethane membrane, thereby achieving a high-efficiency static electricity neutralization effect of the low-temperature ion air.

[0035] The hot flow end is connected to the preheating sleeve, which can spray the hot air in the hot cavity to the polyurethane membrane through the hot hole, and can perform thermal compensation on the stretched membrane material, making the charge distribution on the membrane surface more uniform, which is conducive to the subsequent low-temperature ion wind static elimination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic structural diagram of the distributed heating panel of the present invention;

[0038] Figure 3 This is a schematic structural diagram of the fixing sleeve, ion wind sleeve, and dust suction mouth sleeve of the present invention;

[0039] Figure 4 This is a schematic structural diagram of the heat exchange tube, refrigeration fins, partitions, cold chamber, and hot chamber of the present invention;

[0040] Figure 5 This is a schematic diagram of the exploded structure of the return sleeve, the receiving hole, and the heat exchange tube of the present invention;

[0041] Figure 6 It is a partial cross-sectional structural diagram of the return sleeve and the guide tube of the present invention;

[0042] Figure 7 It is a partial cross-sectional structural diagram of the cold flow tube and the heat exchange tube of the present invention;

[0043] Figure 8 It is a partial cross-sectional structural diagram of the filter inner cylinder and the filter outer cylinder of the present invention;

[0044] Figure 9 This is a structural diagram of the fixed sleeve and the ion blower of the present invention;

[0045] Figure 10 It is a structural schematic diagram of the preheating sleeve, through hole and heat hole of the present invention.

[0046] In the figure: 1. Conveyor roller; 2. Distributed heating plate; 3. Extension roller; 4. Retractable sleeve; 5. Receiving hole; 51. Nozzle; 6. Ion air path; 61. Fixed sleeve; 62. Ion fan; 63. Ion air sleeve; 631. Heat exchange tube; 632. Guide tube; 7. Dust suction air path; 71. Dust suction port sleeve; 72. Filter tube; 721. Inner filter cylinder; 722. Outer filter cylinder; 73. Axial fan; 8. Heat exchange cylinder; 9. Air inlet end; 10. Air outlet end; 11. Cold flow tube; 12. Refrigeration plate; 13. Partition; 14. Cold chamber; 15. Hot chamber; 16. Cold flow end; 17. Hot flow end; 18. Preheating sleeve; 19. Through hole; 20. Hot hole; 21. Exhaust pipe; 22. Grounding wire. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] like Figure 1 、 Figure 2 、 Figure 6 As shown, the present invention provides a polyurethane film forming, stretching and temperature control device, comprising a conveying roller 1 for conveying the polyurethane film, a distributed heating plate 2 for heating the polyurethane film at the conveying roller 1, and a stretching roller 3 for stretching the heated polyurethane film, and further comprising:

[0049] Conveyor roller 1 transports the polyurethane film, which is then heated by distributed heating plate 2 at the conveyor roller 1 to reach the appropriate processing temperature. The heated polyurethane film has improved flexibility and plasticity. Spreading roller 3 then spreads the heated polyurethane film, changing its shape and size to meet the desired specifications, completing the temperature-controlled stretching operation.

[0050] The return sleeve 4 has a receiving hole 5, and the stretched polyurethane film is transported through the receiving hole 5;

[0051] The ion wind path 6 is connected to the receiving hole 5 and guides the ion wind to contact the polyurethane membrane;

[0052] The ions carried by the ion wind neutralize the static charge on the surface of the polyurethane membrane in equal amounts, eliminating static electricity;

[0053] Dust suction air passages 7 are provided on both sides of the return sleeve 4 along the conveying direction of the polyurethane film;

[0054] After the ion wind contacts the polyurethane membrane, it flows along both sides of the receiving hole 5 and enters the dust suction air path 7.

[0055] The receiving hole 5 of the circular sleeve 4 provides a conveying space for the stretched polyurethane film, and the ion wind path 6 uses the receiving hole 5 to guide the ion wind to contact the polyurethane film, so that the ion wind can flow along the conveying space, thereby effectively neutralizing the static charge on the surface of the polyurethane film and the dust and impurities in the circulation are absorbed by the dust collection air path 7. These dust and impurities may be debris generated on the surface of the polyurethane film due to friction and other reasons, and are mainly prevented from falling back onto the surface of the polyurethane film and affecting subsequent processing steps.

[0056] like Figure 3 、 Figure 4 、 Figure 10 As shown, it also includes a heat exchange tube 8, which is provided with an air inlet end 9 and an air outlet end 10. The air inlet end 9 is connected to the dust suction air path 7, and the air outlet end 10 is connected to a cold flow pipe 11. The cold flow pipe 11 is sleeved on the outside of the ion air path 6. A refrigeration plate 12 is provided in the heat exchange tube 8. The dust suction air flow passes through the refrigeration end of the refrigeration plate 12 for cooling, and circulates in the cold flow pipe 11 for heat conduction cooling of the ion air path 6.

[0057] Because the temperature of the ion wind is too high or too low, it may affect its ionization degree and activity, and thus affect the efficiency of static neutralization. Therefore, by circulating the cold flow in the cold flow tube 11, the ion wind flow circulating inside the ion wind path 6 can be cooled by heat conduction, and the temperature of the ion wind can be controlled within an appropriate range, thereby improving the effect of the ion wind in eliminating static electricity and ensuring the consistency and stability of product quality.

[0058] The heat exchange tube 8 further includes a partition 13, which is arranged in the heat exchange tube 8 to separate the heat exchange tube 8 into a cold chamber 14 and a hot chamber 15. The refrigeration fin 12 is arranged through the partition 13, and its cooling end and heating end are respectively located in the cold chamber 14 and the hot chamber 15. The air inlet end 9 is connected to the cold chamber 14 and the hot chamber 15. The air outlet end 10 includes a cold flow end 16 and a hot flow end 17 respectively connected to the cold chamber 14 and the hot chamber 15. The cold flow end 16 is connected to the cold flow pipe 11.

[0059] like Figure 10 As shown, it also includes a preheating sleeve 18, which has a through hole 19. The stretched polyurethane film is transported through the through hole 19. The preheating sleeve 18 is connected to the hot flow end 17. The preheating sleeve 18 is provided with a hot hole 20 for spraying hot air toward the polyurethane film.

[0060] The partition 13 separates the heat exchange tube 8 into a cold chamber 14 and a hot chamber 15 to achieve independent control of the cold and hot air flows. The cooling end and the heating end of the refrigeration plate 12 act on the two chambers respectively. The low-temperature airflow in the cold chamber cools the ion wind through the cold flow pipe 11 to stabilize the ion activity; the high-temperature airflow in the hot chamber is transported to the preheating sleeve 18 to realize waste heat utilization. The preheating sleeve 18 sprays the residual heat of the hot chamber 15 to the surface of the polyurethane membrane in the form of airflow through the heat hole 20, so that the membrane material is preheated and the charge distribution on the membrane surface is more uniform, which is conducive to the subsequent low-temperature ion wind static elimination process.

[0061] like Figure 9 As shown, the ion wind path 6 includes:

[0062] The fixing sleeve 61 is hollow inside;

[0063] The ion blower 62 is connected to the fixed sleeve 61 and generates ion wind to be directed into the fixed sleeve 61;

[0064] The ion wind sleeve 63 has two ends connected to the fixing sleeve 61 and the receiving hole 5 respectively;

[0065] The ion wind flows through the ion wind sleeve 63 and is ejected into the receiving hole 5 to contact the polyurethane film.

[0066] like Figure 5 、 Figure 6 、 Figure 7 As shown, the ion wind sleeve 63 includes:

[0067] The heat exchange tube 631 is connected to the fixed sleeve 61;

[0068] The other end of the cold flow pipe 11 is arranged on the fixed sleeve and is located outside the heat exchange pipe 631. The end of the cold flow pipe 11 is connected to the exhaust pipe 21.

[0069] The two ends of the flow guide pipe 632 are respectively connected to the heat exchange pipe 631 and the receiving hole 5;

[0070] The shape of the cold flow pipe 11 is adapted to fit the connection between the heat exchange pipe 631 and the flow guide pipe 632;

[0071] The receiving hole 5 includes spray holes 51 arranged in an array, and the ion wind flow is sprayed from the spray holes 51 to the surface of the polyurethane film.

[0072] The ion wind path 6 is connected to the ion blower 62 through the fixed sleeve 61 to generate ion wind, which is then transported to the array nozzles 51 of the receiving hole 5 through the heat exchange tube 631 and the guide tube 632 of the ion wind sleeve 63. The nozzles are evenly distributed to ensure that the ion wind fully covers the surface of the polyurethane membrane and effectively neutralizes static charges.

[0073] The cold flow tube 11 surrounds the outside of the heat exchange tube 631, and controls the temperature of the ion wind through heat conduction through external cold flow, maintaining the stability of ion activity and avoiding temperature fluctuations affecting the neutralization effect. At the same time, the exhaust pipe 21 discharges the cooling excess air, realizing the temperature control, uniform jet flow and efficient static electricity elimination of the ion wind, thereby improving the consistency of processing quality.

[0074] like Figure 3 、 Figure 10 As shown, the dust suction air path 7 includes:

[0075] The dust collection mouthpiece 71 is provided on both sides of the circular sleeve 4;

[0076] The filter tube 72 is connected to the dust collection mouthpiece 71;

[0077] The axial flow fan 73 is connected to the filter tube 72.

[0078] like Figure 8 As shown, the filter tube 72 includes a filter inner cylinder 721 and a filter outer cylinder 722 sleeved outside the filter inner cylinder 721 . The filter inner cylinder 721 is connected to the suction side of the axial flow fan 73 , and the filter outer cylinder 722 is connected to the dust suction port sleeve 71 .

[0079] The inner filter cylinder 721 and the outer filter cylinder 722 are connected to the same grounding wire 22 .

[0080] The dust collection air path 7 draws dust-laden ionized air from both sides of the circular sleeve 4 through the dust collection port 71. The outer filter cylinder 722 of the double-layer filter tube 72 initially intercepts large impurities, while the inner filter cylinder 721 further removes fine dust. The axial fan 73 provides stable suction to ensure efficient dust collection. Static charge accumulated during the filtration process is also discharged through the same grounding wire 22, preventing the risk of static electricity attracting impurities and sparks. This achieves graded impurity filtration and static discharge, preventing the utilized airflow from affecting the cleanliness of the polyurethane membrane surface.

[0081] The working principle and use process of the present invention:

[0082] The polyurethane film is transported on the conveying roller 1. At the same time, the distributed heating plate 2 heats the polyurethane film, and then passes through the stretching roller 3 for stretching operation to complete the preliminary processing;

[0083] The stretched polyurethane film continues to be transported, and the ion wind is generated by the ion blower 62. The ion wind flows through the fixed sleeve 61 and enters the heat exchange tube 631. The heat exchange tube 631 guides the ion wind to the guide tube 632, and finally sprays it out from the receiving hole 5 (the nozzle holes 51 arranged in an array), contacting the polyurethane film that has been stretched through the receiving hole 5 to eliminate static electricity.

[0084] At the same time, the axial flow fan 73 collects the airflow that circulates along both sides of the receiving hole 5 after the ion wind contacts the polyurethane membrane. The airflow is filtered to remove impurities through the dust collection port 71, the inner filter cylinder 721 and the outer filter cylinder 722. After being electrostatically guided by the grounding wire 22, the airflow enters the heat exchange cylinder 8 from the air inlet end 9. The refrigeration fins 12 in the heat exchange cylinder 8 cool the airflow in the cold cavity 14. The cooled airflow passes through the cold flow pipe 11 to cool the ion wind in the heat exchange tube 631.

[0085] The refrigeration plate 12 heats the air flow in the heat chamber 15. The hot air flow in the heat chamber 15 enters the preheating sleeve 18 through the hot flow end 17, and sprays the hot air flow from the hot hole 20 to the polyurethane film passing through the through hole 19 to preheat the polyurethane film, thus completing the entire operation.

[0086] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0087] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A polyurethane film forming, stretching and temperature control device, comprising a conveying roller (1) for conveying the polyurethane film, a distributed heating plate (2) for heating the polyurethane film at the conveying roller (1), and a stretching roller (3) for stretching the heated polyurethane film, characterized in that: Also includes: The return sleeve (4) has a receiving hole (5), and the stretched polyurethane film is transported through the receiving hole (5); The ion wind path (6) is connected to the receiving hole (5) and guides the ion wind to contact the polyurethane membrane; The ions carried by the ion wind neutralize the static charge on the surface of the polyurethane membrane in equal amounts, eliminating static electricity; Dust suction air passages (7) are provided on both sides of the return sleeve (4) along the conveying direction of the polyurethane film; After the ion wind contacts the polyurethane membrane, it flows along both sides of the receiving hole (5) and enters the dust suction air path (7); The heat exchange tube (8) is provided with an air inlet end (9) and an air outlet end (10), the air inlet end (9) is connected to the dust suction air path (7), the air outlet end (10) is connected to a cold flow pipe (11), and the cold flow pipe (11) is sleeved on the outside of the ion air path (6); A refrigeration fin (12) is provided in the heat exchange cylinder (8), and the dust collection airflow passes through the refrigeration end of the refrigeration fin (12) for cooling, and ion airflow circulates in the cold flow pipe (11) for heat conduction cooling of the ion air path (6); It also includes a partition (13) which is arranged in the heat exchange tube (8) to separate the heat exchange tube into a cold chamber (14) and a hot chamber (15); the refrigeration plate (12) is arranged through the partition (13); the refrigeration end and the heating end thereof are respectively located in the cold chamber (14) and the hot chamber (15); the air inlet end (9) is connected to the cold chamber (14) and the hot chamber (15); The air outlet end (10) comprises a cold flow end (16) and a hot flow end (17) respectively connected to the cold cavity (14) and the hot cavity (15), and the cold flow end (16) is connected to the cold flow pipe (11); The invention also includes a preheating sleeve (18), wherein the preheating sleeve (18) has a through hole (19), and the stretched polyurethane film is transported through the through hole (19). The preheating sleeve (18) is connected to the hot flow end (17), and the preheating sleeve (18) is provided with a hot hole (20) for spraying hot air flow toward the polyurethane film.

2. The polyurethane film forming and stretching temperature control device according to claim 1, characterized in that: The ion air path (6) includes: A fixed sleeve (61) having a hollow interior; An ion fan (62) is connected to the fixed sleeve (61) and generates ion wind to be directed into the fixed sleeve (61); An ion wind sleeve (63), both ends of which are respectively connected to the fixing sleeve (61) and the receiving hole (5); The ion wind flows through the ion wind sleeve (63) and flows to the receiving hole (5) to be ejected and contact the polyurethane membrane.

3. The polyurethane film forming and stretching temperature control device according to claim 2, characterized in that: The ion wind sleeve (63) comprises: The heat exchange tube (631) is in communication with the fixed sleeve (61); The other end of the cold flow pipe (11) is arranged on the fixed sleeve and is located outside the heat exchange pipe (631), and the end of the cold flow pipe (11) is connected to the exhaust pipe (21); The guide tube (632) has two ends respectively connected to the heat exchange tube (631) and the receiving hole (5); The receiving hole (5) comprises spray holes (51) arranged in an array, and ion wind flow is sprayed from the spray holes (51) to the surface of the polyurethane film.

4. A polyurethane film forming and stretching temperature control device according to any one of claims 1 to 3, characterized in that: The dust suction air path (7) comprises: Dust suction mouth sleeves (71) are provided on both sides of the circular sleeve (4); A filter tube (72) is connected to the dust collection mouthpiece (71); The axial flow fan (73) is connected to the filter tube (72).

5. The polyurethane film forming and stretching temperature control device according to claim 4, characterized in that: The filter tube (72) comprises a filter inner cylinder (721) and a filter outer cylinder (722) sleeved outside the filter inner cylinder (721); the filter inner cylinder (721) is connected to the air suction side of the axial flow fan (73); and the filter outer cylinder (722) is connected to the dust suction port sleeve (71).

6. The polyurethane film forming and stretching temperature control device according to claim 5, characterized in that: The inner filter cylinder (721) and the outer filter cylinder (722) are connected to the same grounding wire (22).

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