Polyurethane film generation extension temperature control equipment

Abstract

The invention belongs to the technical field of polyurethane film processing, and discloses polyurethane film generation and extension temperature control equipment which comprises a conveying roller for conveying a 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, and further comprises a concentric-square-shaped sleeve with a containing hole, the extended polyurethane film is conveyed to pass through the accommodating hole; the ion wind path is communicated with the accommodating hole and used for guiding ion wind to be in contact with the polyurethane film; and ions carried in the ionic wind are equivalently neutralized with electrostatic charges on the surface of the polyurethane film, so that static electricity is eliminated. Uniform ion wind is sprayed through the ion wind paths in the concentric-square-shaped sleeve, equivalent neutralization of electrostatic charges on the surface of a membrane material is achieved, symmetrical suction of the dust suction wind paths on the two sides is combined, dust is effectively captured and separated, secondary pollution caused by airflow turbulence is avoided, and the ion covering uniformity is further improved through the array spraying holes of the ion wind sleeve.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane film processing, and specifically relates to a polyurethane film production, stretching and temperature control device. Background Art

[0002] Due to its excellent mechanical properties, weather resistance and processability, polyurethane film is widely used in the fields of flexible electronics, medical packaging, intelligent materials, etc. In the production process of polyurethane film, stretching forming and temperature control are the core links that determine the mechanical properties and surface quality of the film material. The existing technology usually uses a distributed heating device to control the molecular chain orientation and cooperates with a multi-stage roller group for mechanical stretching.

[0003] However, it is found in actual production that a large amount of static electricity will be generated during the stretching process due to the contact friction between the film material and the roller body. Especially in the dry working condition, the surface static voltage can reach several thousand volts. The static electricity residue will cause the film layers to stick together during the subsequent slitting and winding processes, directly affecting the product yield. The traditional solution mostly uses an external ion blower for local static electricity neutralization. However, this method has problems such as uneven ion coverage and low neutralization efficiency. In addition, the air flow during the static electricity elimination process will also generate dust particles, resulting in the situation that the stretched film material will still adsorb dust particles.

[0004] Therefore, a polyurethane film production, stretching and temperature control device is proposed to solve the above problems. Summary of the Invention

[0005] To solve the problems raised in the above background art, the present invention provides a polyurethane film production, stretching and temperature control device.

[0006] To achieve the above object, the present invention provides the following technical solution: A polyurethane film production, stretching and temperature control device, including 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, further including: A loop-shaped sleeve having a receiving hole through which the stretched polyurethane film is conveyed; An ion air path communicating with the receiving hole to guide the ion wind to contact the polyurethane film; The ions carried in the ion wind neutralize the static charges on the surface of the polyurethane film in an equal amount to eliminate static electricity; A dust suction air path provided on both sides of the loop-shaped sleeve along the conveying direction of the polyurethane film; After the ion wind contacts the polyurethane film, it flows into the dust suction air path along both sides of the receiving hole.

[0007] In the above technical solution, preferably, it further includes a heat exchange cylinder, which is provided with an air inlet end and an air outlet end. The air inlet end is communicated with the dust suction air path, and the air outlet end is communicated with a cold flow pipe. The cold flow pipe is sleeved outside the ion air path. A refrigerating sheet is arranged in the heat exchange cylinder. The dust suction air flow is cooled by passing through the refrigerating end of the refrigerating sheet, and the cold flow for heat conduction is circulated in the cold flow pipe to cool the ion air flow flowing inside the ion air path.

[0008] In the above technical solution, preferably, it further includes a partition plate, which is arranged in the heat exchange cylinder and divides it into a cold cavity and a hot cavity. The refrigerating sheet penetrates through the partition plate, and its refrigerating end and heating end are respectively located in the cold cavity and the hot cavity. The air inlet end is communicated with the cold cavity and the hot cavity, and the air outlet end includes a cold flow end and a hot flow end respectively communicated with the cold cavity and the hot cavity. The cold flow end is communicated with the cold flow pipe.

[0009] In the above technical solution, preferably, it further includes a preheating sleeve, which has a through hole, and the extended polyurethane film is conveyed through the through hole. The preheating sleeve is communicated with the hot flow end, and the preheating sleeve is provided with hot holes for spraying hot air flow towards the polyurethane film.

[0010] In the above technical solution, preferably, the ion air path includes: A fixed sleeve, which is hollow inside; An ion blower, which is communicated with the fixed sleeve and generates ion wind to be guided into the fixed sleeve; An ion air sleeve, with both ends respectively communicated with the fixed sleeve and the accommodation hole; The ion air flow flows through the ion air sleeve to the accommodation hole and sprays out to contact the polyurethane film.

[0011] In the above technical solution, preferably, the ion air sleeve includes: A heat exchange pipe, which is communicated with the fixed sleeve; The other end of the cold flow pipe is arranged on the fixed sleeve and is located outside the heat exchange pipe. The end of the cold flow pipe is communicated with an exhaust pipe; A diversion pipe, with both ends respectively communicated with the heat exchange pipe and the accommodation hole; The accommodation hole includes spray holes arranged in an array, and the ion air flow sprays out from the spray holes to the surface of the polyurethane film.

[0012] In the above technical solution, preferably, the dust suction air path includes: Dust suction mouth sleeves, which are arranged on both sides of the return-shaped sleeve; Filter pipes, which are communicated with the dust suction mouth sleeves; Axial flow fans, which are communicated with the filter pipes.

[0013] In the above technical solution, preferably, the filter pipe includes a filter inner cylinder and a filter outer cylinder sleeved outside the filter inner cylinder. The filter inner cylinder is communicated with the air suction side of the axial flow fan, and the filter outer cylinder is communicated with the dust suction mouth sleeve.

[0014] In the above technical solution, preferably, the inner filter cylinder and the outer filter cylinder are connected to the same grounding wire.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention sprays uniform ion wind through the ion air path in the return-shaped sleeve to achieve equal neutralization of the static charges on the surface of the membrane material. Combined with the symmetric suction of the dust suction air paths on both sides, it effectively captures the separated dust and avoids secondary pollution caused by air flow disorder. The array of spray holes in the ion wind sleeve further improves the uniformity of ion coverage; The dust suction air flow passes through the nested structure of the inner filter cylinder and the outer filter cylinder, and with the design of sharing the grounding wire, it can intercept dust of different particle sizes in stages, prevent the accumulation of static electricity and enter the subsequent air flow circulation, ensure the clean circulation of the air flow, and the subsequent air flow cooperates with the heat exchange cylinder to divide the purified air flow into cold and hot dual paths for separate utilization; Through structures such as the heat exchange cylinder, the refrigeration chip, and the cold flow pipe, the purified air flow is cooled. The low-temperature air flow in the cold cavity is wrapped outside the ion air path through the cold flow pipe, and the ion air flow in the ion air path is cooled through conduction and convection, ensuring that the ion wind is at an appropriate temperature before being sprayed onto the surface of the polyurethane membrane, which 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, achieving an efficient electrostatic neutralization effect of low-temperature ion wind.

[0016] The hot flow end is connected to the preheating sleeve, and the hot air in the hot cavity can be sprayed out as a hot air flow through the hot holes towards the polyurethane membrane, which can perform heat compensation on the extended membrane material, make the charge distribution on the membrane surface more uniform, and is conducive to the subsequent process of low-temperature ion wind static electricity elimination. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the distributed heating plate of the present invention; Figure 3 It is a schematic structural diagram of the fixed sleeve, the ion wind sleeve, and the dust suction port sleeve of the present invention; Figure 4 It is a schematic structural diagram of the heat exchange cylinder, the refrigeration chip, the partition plate, the cold cavity, and the hot cavity of the present invention; Figure 5 It is an exploded structural diagram of the return-shaped sleeve, the accommodation hole, and the heat exchange tube of the present invention; Figure 6 It is a partial sectional structural diagram of the return-shaped sleeve and the diversion tube of the present invention; Figure 7 It is a partial sectional structural diagram of the cold flow pipe and the heat exchange tube of the present invention; Figure 8Schematic diagram of the partial sectional structure of the filter inner cylinder and the filter outer cylinder of the present invention; Figure 9 Schematic diagram of the structure of the fixing sleeve and the ion blower of the present invention; Figure 10 Schematic diagram of the structure of the preheating sleeve, the through hole, and the heat hole of the present invention.

[0018] In the figure: 1. Conveyor roller; 2. Distributed heating plate; 3. Extension roller; 4. Return sleeve; 5. Accommodating hole; 51. Spray hole; 6. Ion air path; 61. Fixing sleeve; 62. Ion blower; 63. Ion air sleeve; 631. Heat exchange tube; 632. Duct; 7. Dust suction air path; 71. Dust suction port sleeve; 72. Filter tube; 721. Filter inner cylinder; 722. Filter outer cylinder; 73. Axial flow fan; 8. Heat exchange cylinder; 9. Intake end; 10. Outlet end; 11. Cold flow tube; 12. Refrigeration chip; 13. Partition; 14. Cold cavity; 15. Hot cavity; 16. Cold flow end; 17. Hot flow end; 18. Preheating sleeve; 19. Through hole; 20. Heat hole; 21. Exhaust pipe; 22. Ground wire. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1 、 Figure 2 、 Figure 6 shown, the present invention provides a polyurethane film forming and extension temperature control device, including a conveyor roller 1 for conveying the polyurethane film, a distributed heating plate 2 for heating the polyurethane film at the conveyor roller 1, and an extension roller 3 for extending the heated polyurethane film, and further including:

[0021] The conveyor roller 1 conveys the polyurethane film and the distributed heating plate 2 heats the polyurethane film at the conveyor roller 1, so that the polyurethane film can reach a suitable processing temperature. The heated polyurethane film has better flexibility and plasticity, and then the extension roller 3 extends the heated polyurethane film to change the shape and size of the polyurethane film to meet the expected specification requirements, completing the temperature control and extension operation.

[0022] A return sleeve 4 having an accommodating hole 5, and the extended polyurethane film is conveyed through the accommodating hole 5; An ion air path 6 communicating with the accommodating hole 5 to guide the ion air to contact the polyurethane film; As the ions carried in the ion air are neutralized with the static charges on the surface of the polyurethane film in an equal amount, the static electricity is eliminated; The dust suction air path 7 is arranged on both sides of the loop-shaped sleeve 4 along the conveying direction of the polyurethane film; After contacting the polyurethane film with the ion wind, it flows into the dust suction air path 7 along both sides of the accommodation hole 5.

[0023] The accommodation hole 5 of the loop-shaped sleeve 4 provides a conveying space for the extended polyurethane film, and the ion wind path 6 enables the guiding ion wind to contact the polyurethane film through the accommodation hole 5, so that the ion wind can flow along the conveying space, thereby effectively neutralizing the static charges on the surface of the polyurethane film and sucking the ion wind, as well as the flowing dust and impurities by the dust suction air path 7. These dust and impurities may be debris generated on the surface of the polyurethane film due to friction and other reasons. Mainly to avoid falling back onto the surface of the polyurethane film and affecting the subsequent processing procedures.

[0024] Such as Figure 3 、 Figure 4 、 Figure 10 As shown, it further includes a heat exchange cylinder 8. An air inlet end 9 and an air outlet end 10 are provided on the heat exchange cylinder 8. The air inlet end 9 is communicated with the dust suction air path 7. The air outlet end 10 is communicated with a cold flow pipe 11. The cold flow pipe 11 is sleeved outside the ion wind path 6. A refrigerating sheet 12 is arranged inside the heat exchange cylinder 8. It is cooled by the refrigerating end of the refrigerating sheet 12 along with the dust suction air flow and flows in the cold flow pipe 11 for heat conduction to cool the ion wind flowing inside the ion wind path 6.

[0025] Because the temperature of the ion wind being too high or too low may affect its ionization degree and activity, and thus affect the efficiency of static electricity neutralization. Therefore, by using the cold flow to flow in the cold flow pipe 11, it can conduct heat conduction cooling on the ion wind flowing inside the ion wind path 6, control the temperature of the ion wind within a suitable range, improve the effect of the ion wind in eliminating static electricity, and ensure the consistency and stability of product quality.

[0026] It further includes a partition plate 13, which is arranged inside the heat exchange cylinder 8 and divides it into a cold cavity 14 and a hot cavity 15. The refrigerating sheet 12 is penetrated and arranged inside the partition plate 13, and its refrigerating end and heating end are respectively located in the cold cavity 14 and the hot cavity 15. The air inlet end 9 is communicated with the cold cavity 14 and the hot cavity 15. The air outlet end 10 includes a cold flow end 16 and a hot flow end 17 that are respectively communicated with the cold cavity 14 and the hot cavity 15. The cold flow end 16 is communicated with the cold flow pipe 11.

[0027] Such as Figure 10 , as shown, it further includes a preheating sleeve 18. The preheating sleeve 18 has a through hole 19. The extended polyurethane film is conveyed through the through hole 19. The preheating sleeve 18 is communicated with the hot flow end 17. The preheating sleeve 18 is provided with a hot hole 20 that sprays hot air flow towards the polyurethane film.

[0028] The partition plate 13 divides the heat exchange cylinder 8 into a cold chamber 14 and a hot chamber 15, realizing independent control of cold and hot airflows. The cooling end and the heating end of the Peltier cooler 12 act on the two chambers respectively. The low-temperature air current in the cold chamber cools the ionic wind through the cold flow pipe 11, stabilizing the ionic activity; the high-temperature air current in the hot chamber is then transported to the preheating sleeve 18 to realize waste heat utilization. The preheating sleeve 18 sprays the waste heat in the hot chamber 15 onto the surface of the polyurethane film in the form of an air current through the heat holes 20, preheating the film material and making the charge distribution on the film surface more uniform, which is beneficial to the subsequent process of electrostatic elimination by low-temperature ionic wind.

[0029] As Figure 9 shown, the ionic wind path 6 includes: A fixed sleeve 61, which is hollow inside; An ionic wind machine 62, which is connected to the fixed sleeve 61 and generates an ionic wind to be guided into the fixed sleeve 61; An ionic wind sleeve 63, with both ends respectively connected to the fixed sleeve 61 and the receiving hole 5; The ionic wind flows through the ionic wind sleeve 63 and circulates to the receiving hole 5 and sprays out to contact the polyurethane film.

[0030] As Figure 5 、 Figure 6 、 Figure 7 shown, the ionic wind sleeve 63 includes: A heat exchange pipe 631, which is connected to 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. The end of the cold flow pipe 11 is connected to an exhaust pipe 21; A guide pipe 632, with both ends respectively connected to the heat exchange pipe 631 and the receiving hole 5; Among them, the shape of the cold flow pipe 11 is adapted to the sleeve at the connection of the heat exchange pipe 631 and the guide pipe 632; The receiving hole 5 includes spray holes 51 arranged in an array, and the ionic wind flows out from the spray holes 51 to the surface of the polyurethane film.

[0031] The ionic wind path 6 is connected to the ionic wind machine 62 through the fixed sleeve 61 to generate an ionic wind, and is transported to the array of spray holes 51 of the receiving hole 5 through the heat exchange pipe 631 and the guide pipe 632 of the ionic wind sleeve 63. The uniform distribution of the spray holes ensures that the ionic wind fully covers the surface of the polyurethane film, efficiently neutralizing static charges; The cold flow pipe 11 surrounds the outside of the heat exchange pipe 631, and thermally conducts and controls the temperature of the ionic wind through external cold flow, maintaining the stability of ionic activity and avoiding the influence of temperature fluctuations on the neutralization effect. At the same time, the exhaust pipe 21 discharges the cooling residual gas, realizing the temperature control, uniform jet flow and efficient electrostatic elimination of the ionic wind, and improving the consistency of processing quality.

[0032] As Figure 3 、 Figure 10 shown, the dust suction wind path 7 includes: The dust suction mouth cover 71 is arranged on both sides of the circular cover 4; The filter tube 72 is connected to the dust suction mouthpiece 71; The axial flow fan 73 is connected to the filter tube 72 .

[0033] 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 air suction side of the axial flow fan 73 , and the filter outer cylinder 722 is connected to the dust suction port sleeve 71 .

[0034] The inner filter cylinder 721 and the outer filter cylinder 722 are connected to the same grounding wire 22 .

[0035] The dust suction air path 7 absorbs dust-containing ion wind from both sides of the return sleeve 4 through the dust suction port sleeve 71, the filter outer cylinder 722 of the double-layer filter tube 72 initially intercepts large particles of impurities, and the filter inner cylinder 721 further filters fine dust. The axial flow fan 73 provides stable suction to ensure efficient dust collection; and the static charge accumulated during the filtering process is guided out through the same grounding wire 22 to avoid the risk of static electricity adsorbing impurities or sparks. Impurity classification filtration and static electricity release are achieved, avoiding the impact of the utilized airflow on the cleanliness of the polyurethane membrane surface.

[0036] The working principle and use process of the present invention: 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; The stretched polyurethane film is continuously transported, and the ion fan 62 generates ion wind, which enters the heat exchange tube 631 through the fixed sleeve 61. The heat exchange tube 631 guides the ion wind to the guide tube 632, and finally sprays out from the receiving hole 5 (the spray holes 51 arranged in an array), and contacts with the polyurethane film that has stretched through the receiving hole 5 to eliminate static electricity. At the same time, the axial flow fan 73 collects the airflow flowing along the two sides of the receiving hole 5 after the ion wind contacts the polyurethane membrane. The airflow is filtered through the dust suction mouth sleeve 71, the filter inner cylinder 721 and the filter outer cylinder 722 to remove impurities. After being electrostatically guided out by the grounding wire 22, the airflow enters the heat exchange cylinder 8 from the air inlet end 9. The refrigeration plate 12 in the heat exchange cylinder 8 cools the airflow in the cold cavity 14. The cooled airflow cools the ion wind in the heat exchange tube 631 through the cold flow pipe 11. 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 the hot air flow is sprayed 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.

[0037] It should be noted that in this text, relational terms such as first and second are only used 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 "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyurethane film forming and stretching temperature control device, comprising a conveying roller (1) for conveying a 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, It also includes: A loop-shaped sleeve (4) having a receiving hole (5) through which the extended polyurethane film is conveyed; An ion air path (6) communicating with the receiving hole (5) to direct ion wind into contact with the polyurethane film; As the ions carried in the ion wind neutralize the static charges on the surface of the polyurethane film in equal amounts, the static electricity is eliminated; A dust suction air path (7) provided on both sides of the loop-shaped sleeve (4) along the conveying direction of the polyurethane film; After the ion wind contacts the polyurethane film, it flows into the dust suction air path (7) along both sides of the receiving hole (5).

2. The polyurethane film generating and stretching temperature control device according to claim 1, characterized in that: It also includes a heat exchange cylinder (8) provided with an air inlet end (9) and an air outlet end (10). The air inlet end (9) is communicated with the dust suction air path (7), and the air outlet end (10) is communicated with a cold flow pipe (11). The cold flow pipe (11) is sleeved outside the ion air path (6); A refrigerating sheet (12) is provided inside the heat exchange cylinder (8). As the dust suction air flow passes through the refrigerating end of the refrigerating sheet (12), it is cooled and flows in the cold flow pipe (11) for heat conduction to cool the ion air flow flowing inside the ion air path (6).

3. The polyurethane film generating and stretching temperature control device according to claim 2, wherein: It also includes a partition plate (13) provided inside the heat exchange cylinder (8) to divide it into a cold chamber (14) and a hot chamber (15). The refrigerating sheet (12) is disposed through the partition plate (13), and its refrigerating end and heating end are respectively located in the cold chamber (14) and the hot chamber (15). The air inlet end (9) is communicated with 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 communicated with the cold chamber (14) and the hot chamber (15). The cold flow end (16) is communicated with the cold flow pipe (11).

4. The polyurethane film generating and stretching temperature control device according to claim 3, characterized in that: It also includes a preheating sleeve (18) having a through hole (19) through which the extended polyurethane film is conveyed. The preheating sleeve (18) is communicated with the hot flow end (17), and heat holes (20) for spraying hot air towards the polyurethane film are provided on the preheating sleeve (18).

5. The polyurethane film generating and stretching temperature control device according to claim 2, wherein: The ion air path (6) includes: A fixed sleeve (61) with a hollow interior; An ion blower (62) communicated with the fixed sleeve (61) to generate ion wind and direct it into the fixed sleeve (61); An ion air sleeve (63) with both ends respectively communicated with the fixed sleeve (61) and the receiving hole (5); As the ion air flow flows through the ion air sleeve (63) and is ejected from the receiving hole (5) to contact the polyurethane film.

6. A polyurethane film forming and stretching temperature control device according to claim 5, characterized in that: The ion air sleeve (63) includes: A heat exchange pipe (631) communicated with the fixed sleeve (61); The other end of the cold flow pipe (11) is disposed on the fixed sleeve and outside the heat exchange pipe (631), and the end of the cold flow pipe (11) is communicated with an exhaust pipe (21); A diversion pipe (632) with both ends respectively communicated with the heat exchange pipe (631) and the receiving hole (5); The receiving hole (5) includes spray holes (51) arranged in an array, and the ion air flow is ejected from the spray holes (51) onto the surface of the polyurethane film.

7. A polyurethane film generating and stretching temperature control device according to any one of claims 1-6, characterized in that: The dust suction air path (7) includes: A dust suction port sleeve (71) provided on both sides of the loop-shaped sleeve (4); A filter pipe (72) communicated with the dust suction port sleeve (71); An axial flow fan (73) communicated with the filter pipe (72).

8. A polyurethane film generating and stretching temperature control device according to claim 7, characterized in that: 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 communicated with the air suction side of the axial flow fan (73), and the filter outer cylinder (722) is communicated with the dust suction port sleeve (71).

9. The polyurethane film forming and stretching temperature control device according to claim 8, characterized in that: The filter inner cylinder (721) and the filter outer cylinder (722) are connected to the same grounding wire (22).

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