Water bath purification circulating device for compatible production of BOPP (biaxially-oriented polypropylene) and BOPE (biaxially-oriented polyethylene) films

Abstract

The utility model discloses a water bath purification circulating device for compatible production of BOPP (biaxially-oriented polypropylene) and BOPE (biaxially-oriented polyethylene) films, which relates to the field of film production equipment and comprises a first water bath, a second water bath and a third water bath. A second overflow port and a second reflux port are formed in the tank wall of the second water bath tank; the first purification circulation system comprises a first purification water tank and a first heat exchanger, the first overflow port is connected with the first purification water tank, a water outlet and a first backflow port of the first purification water tank are connected with the first heat exchanger through a first converging water pipe, and the first heat exchanger is connected with a first water sprayer through a heater; the second purification circulation system comprises a second purification water tank and a second heat exchanger, a second overflow port is connected with the second purification water tank, a water outlet and a second backflow port of the second purification water tank are connected with the second heat exchanger through a second convergence water pipe, and the second heat exchanger is connected with a second water sprayer; and the switching system is arranged between the two purification circulating systems.

Description

Technical Field

[0001] The utility model belongs to the field of film production equipment, and more specifically relates to a water bath purification circulation device for compatible production of BOPP and BOPE films. Background Art

[0002] The BOPP and BOPE film compatible production line is a new concept in the past decade. The traditional BOPP and BOPE film compatible production line needs to have two independent water tanks in its casting system, corresponding to two independent circulation temperature control systems. The casting water bath has a heating function, and the thick film water bath is a conventional water bath. When producing BOPE products, because the crystallization and other properties of PE materials are different from those of PP, the two systems need to operate independently, one for heating and the other for cooling. When producing standard BOPP products, the cast film needs to be quickly cooled and crystallized.

[0003] The compatible system currently used is not conducive to the rapid crystallization of homopolymer PP when producing BOPP film, which affects the optical properties of the film, resulting in increased haze and reduced glossiness of the product, thus affecting the user experience. When producing ultra-thin products, the impact of the water bath water flow directly affects the quality of the casting, and in severe cases, it causes film breakage and production suspension. Current production requires two systems to run simultaneously, and two water pumps consume energy to do work, resulting in increased energy consumption. Utility Model Content

[0004] The utility model aims to address the deficiencies in the prior art and provides a water bath purification circulation device for the compatible production of BOPP and BOPE films. The purification circulation device includes two purification circulation systems, the refrigeration capacity meets the production process requirements, and the systems can be freely switched and combined according to different types of films produced and different seasons, thereby effectively reducing production energy consumption.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a water bath purification circulation device for the compatible production of BOPP and BOPE films, comprising:

[0006] A first water bath tank, used for placing a chilled roller, wherein the first water bath tank is provided with a first overflow port and a first reflux port;

[0007] A second water bath, used for placing the casting guide roller, wherein the second water bath is provided with a second overflow port and a second reflux port;

[0008] A first purification circulation system comprises a first purified water tank and a first heat exchanger, wherein the first overflow port is connected to a water inlet of the first purified water tank, a water outlet of the first purified water tank and the first reflux port are connected to a water inlet of the first heat exchanger through a first converging water pipe, and the first heat exchanger is connected to a first water sprayer disposed in the first water bath through a heater;

[0009] a second purification circulation system, comprising a second purified water tank and a second heat exchanger, wherein the second overflow port is connected to a water inlet of the second purified water tank, a water outlet of the second purified water tank and the second reflux port are connected to a water inlet of the second heat exchanger through a second converging water pipe, and the second heat exchanger is connected to a second water sprayer disposed in the second water bath;

[0010] The switching system includes a plurality of control valves arranged between the first purification circulation system and the second purification circulation system.

[0011] Optionally, a first water pipe is provided between the first overflow port and the first purified water tank, a first control valve and a second control valve are provided on the first water pipe, and a second water pipe is provided between the first purified water tank and the first confluent water pipe.

[0012] Optionally, a third water pipe is provided between the first reflux port and the first converging water pipe, and a third control valve and a fourth control valve are provided on the third water pipe.

[0013] Optionally, a fourth water pipe is provided between the first converging water pipe and the first heat exchanger, and a first water pump, a fifth control valve and a sixth control valve are sequentially provided on the fourth water pipe.

[0014] Optionally, a fifth water pipe is provided between the second overflow port and the second purified water tank, a seventh control valve and an eighth control valve are provided on the fifth water pipe, and a sixth water pipe is provided between the second purified water tank and the second confluent water pipe.

[0015] Optionally, a seventh water pipe is provided between the second reflux port and the second converging water pipe, and a ninth control valve and a tenth control valve are provided on the seventh water pipe.

[0016] Optionally, an eighth water pipe is provided between the second merging water pipe and the second heat exchanger, and a second water pump, an eleventh control valve and a twelfth control valve are sequentially provided on the eighth water pipe.

[0017] Optionally, the switching system includes a first switching valve, a second switching valve and a third switching valve, the first switching valve is arranged between the first water pipe and the fifth water pipe, the second switching valve is arranged between the third water pipe and the seventh water pipe, and the third switching valve is arranged between the fourth water pipe and the eighth water pipe.

[0018] Optionally, the first heat exchanger and the second heat exchanger are plate heat exchangers.

[0019] Optionally, the control valve in the switching system is a butterfly valve.

[0020] The utility model provides a water bath purification circulation device for the compatible production of BOPP and BOPE films, and its beneficial effects are: the purification circulation device is developed and designed under the corresponding current dual-carbon policy, the refrigeration capacity generated by the device can meet the process requirements of film production, and can be switched freely when producing BOPP and BOPE, and can also be switched according to the external ambient temperature, which can save a lot of production funds and ensure the production quality of the film.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0023] Figure 1 A schematic structural diagram of a water bath purification circulation device for producing BOPP and BOPE films compatible with one embodiment of the utility model is shown.

[0024] Description of reference numerals:

[0025] 1. First water bath; 101. First overflow port; 102. First return port; 103. First purified water tank; 104. First heat exchanger; 105. First converging water pipe; 106. Heater; 107. First control valve; 108. Second control valve; 109. Third control valve; 110. Fourth control valve; 111. First water pump; 112. Fifth control valve; 113. Sixth control valve; 2. Second water bath; 201. Second overflow port; 202. Second return port; 203. Second purified water tank; 204. Second heat exchanger; 205 , the second converging water pipe; 206, the seventh control valve; 207, the eighth control valve; 208, the ninth control valve; 209, the tenth control valve; 210, the second water pump; 211 the eleventh control valve; 212, the twelfth control valve; 3, the chilling roller; 4, the casting guide roller; 5, the first water sprayer; 6, the second water sprayer; 7, the first switching valve; 8, the second switching valve; 9, the third switching valve; 10, the die head; 11, the casting air knife; 12, the dewatering air knife; 13, the dewatering pressure roller; 14, the peeling roller; 15, the thick sheet guide roller; 16, the guide roller pressure roller; 17, the guide roller. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0027] The utility model provides a water bath purification circulation device for compatible production of BOPP and BOPE films, comprising:

[0028] A first water bath tank, used for placing a chilled roller, and provided with a first overflow port and a first reflux port;

[0029] A second water bath, used for placing the casting guide roller, and provided with a second overflow port and a second reflux port;

[0030] A first purification circulation system includes a first purified water tank and a first heat exchanger, wherein the first overflow port is connected to the water inlet of the first purified water tank, the water outlet and the first reflux port of the first purified water tank are connected to the water inlet of the first heat exchanger through a first converging water pipe, and the first heat exchanger is connected to a first water sprayer disposed in the first water bath through a heater;

[0031] A second purification circulation system includes a second purified water tank and a second heat exchanger, the second overflow port is connected to the water inlet of the second purified water tank, the water outlet and the second reflux port of the second purified water tank are connected to the water inlet of the second heat exchanger through a second confluent water pipe, and the second heat exchanger is connected to a second water sprayer disposed in the second water bath;

[0032] The switching system includes a plurality of control valves arranged between the first purification circulation system and the second purification circulation system.

[0033] Specifically, the purification circulation device is arranged on the original production line, the first purification circulation system is connected to the first water bath, and the second purification circulation system is connected to the second water bath. A part of the deionized water in the first water bath flows out through the first overflow port, and the other part flows out through the first reflux port. The two parts of deionized water are combined and heat exchanged through the first heat exchanger, and then the temperature is adjusted by the heater, and finally sent to the first water sprayer to cool the polyolefin solution in the first water bath; the second purification circulation system cools the deionized water in the second water bath in the same way, and finally cools the polyolefin solution in the second water bath through the second water sprayer; when producing BOPP film, the switching system can be started so that the deionized water in the two water baths are temperature-controlled by the first heat exchanger and the heater, which can reduce the energy consumption of the device.

[0034] Optionally, a first water pipe is provided between the first overflow port and the first purified water tank, a first control valve and a second control valve are provided on the first water pipe, and a second water pipe is provided between the first purified water tank and the first confluent water pipe.

[0035] Optionally, a fifth water pipe is provided between the second overflow port and the second purified water tank, a seventh control valve and an eighth control valve are provided on the fifth water pipe, and a sixth water pipe is provided between the second purified water tank and the second confluent water pipe.

[0036] Specifically, in the first purification circulation system, the first control valve and the second control valve are used to control the deionized water delivered into the first purification water tank, which has the same function as the seventh control valve and the eighth control valve in the second purification circulation system. When the purification circulation device needs to be switched to optimized operation, the eighth control valve needs to be closed and the first switching valve needs to be opened, so that the deionized water in the two water baths flows into the first purification water tank and is purified by the first purification circulation system, thereby reducing the energy consumption of the device.

[0037] Optionally, a third water pipe is provided between the first reflux port and the first converging water pipe, and a third control valve and a fourth control valve are provided on the third water pipe.

[0038] Optionally, a fourth water pipe is provided between the first merging water pipe and the first heat exchanger, and a first water pump, a fifth control valve and a sixth control valve are sequentially provided on the fourth water pipe.

[0039] Optionally, a seventh water pipe is provided between the second reflux port and the second converging water pipe, and a ninth control valve and a tenth control valve are provided on the seventh water pipe.

[0040] Optionally, an eighth water pipe is arranged between the second merging water pipe and the second heat exchanger, and a second water pump, an eleventh control valve and a twelfth control valve are arranged in sequence on the eighth water pipe.

[0041] Specifically, in the first purification circulation system, the deionized water flowing out of the first purification water tank and the deionized water flowing out of the bottom of the first water bath tank through the third water pipe are combined and pumped into the first heat exchanger by the first water pump, and the deionized water is cooled and heated by the first heat exchanger and the heater, so that the polyolefin melt can be cooled and shaped. In the second purification circulation system, the water pump and the control valve arranged in the seventh water pipe and the eighth water pipe have the same function as that in the first purification circulation system; when the purification circulation device produces BOPP film, it is necessary to open all the switching valves in the switching system, and at the same time, the eighth control valve, the tenth control valve and the eleventh control valve are opened. The control valve is closed, so that the deionized water flowing out of the second overflow port is sent to the first purified water tank for purification, and the deionized water flowing out of the second reflux port is sent to the third water pipe and pumped into the two heat exchangers through the first water pump. Since the tenth control valve and the eleventh control valve are closed, the purified deionized water can return to the second purification circulation system through the third switching valve and exchange heat through the second heat exchanger, thereby cooling the polyolefin melt on the casting guide roller in the second water bath. Through the control of the switching system, the second purified water tank and the second water pump can be closed during the BOPP film production process, effectively reducing production energy consumption.

[0042] Optionally, the switching system includes a first switching valve, a second switching valve and a third switching valve, the first switching valve is arranged between the first water pipe and the fifth water pipe, the second switching valve is arranged between the third water pipe and the seventh water pipe, and the third switching valve is arranged between the fourth water pipe and the eighth water pipe.

[0043] Optionally, the first heat exchanger and the second heat exchanger are plate heat exchangers, and the control valve in the switching system is a butterfly valve.

[0044] Specifically, in the purification circulation device, a plate heat exchanger is used to exchange heat for deionized water, and all valve bodies are butterfly valves, so that the parts can be purchased on the market, and the product technology is mature, which can effectively reduce the economic cost of the purification circulation device and extend the service life of the device.

[0045] Example

[0046] like Figure 1 As shown, the utility model provides a water bath purification circulation device for the compatible production of BOPP and BOPE films, comprising:

[0047] A first water bath 1 is used to place a chilled roller 3, and a first overflow port 101 and a first reflux port 102 are provided on the first water bath 1;

[0048] The second water bath 2 is used to place the casting guide roller 4, and the second water bath 2 is provided with a second overflow port 201 and a second reflux port 202;

[0049] The first purification circulation system includes a first purified water tank 103 and a first heat exchanger 104, the first overflow port 101 is connected to the water inlet of the first purified water tank 103, the water outlet of the first purified water tank 103 and the first reflux port 102 are connected to the water inlet of the first heat exchanger 104 through a first converging water pipe 105, and the first heat exchanger 104 is connected to the first water sprayer 5 disposed in the first water bath 1 through a heater 106;

[0050] The second purification circulation system includes a second purified water tank 203 and a second heat exchanger 204, the second overflow port 201 is connected to the water inlet of the second purified water tank 203, the water outlet of the second purified water tank 203 and the second reflux port 202 are connected to the water inlet of the second heat exchanger 204 through a second confluent water pipe 205, and the second heat exchanger 204 is connected to a second water sprayer 6 disposed in the second water bath 2;

[0051] The switching system includes a plurality of control valves arranged between the first purification circulation system and the second purification circulation system.

[0052] In this embodiment, a first water pipe is provided between the first overflow port 101 and the first purified water tank 103 , a first control valve 107 and a second control valve 108 are provided on the first water pipe, and a second water pipe is provided between the first purified water tank 103 and the first converging water pipe 105 .

[0053] In this embodiment, a third water pipe is provided between the first reflux port 102 and the first converging water pipe 105 , and a third control valve 109 and a fourth control valve 110 are provided on the third water pipe.

[0054] In this embodiment, a fourth water pipe is provided between the first converging water pipe 105 and the first heat exchanger 104 , and a first water pump 111 , a fifth control valve 112 and a sixth control valve 113 are sequentially provided on the fourth water pipe.

[0055] In this embodiment, a fifth water pipe is provided between the second overflow port 201 and the second purified water tank 203 , a seventh control valve 206 and an eighth control valve 207 are provided on the fifth water pipe, and a sixth water pipe is provided between the second purified water tank 203 and the second confluent water pipe 205 .

[0056] In this embodiment, a seventh water pipe is provided between the second reflux port 202 and the second converging water pipe 205 , and a ninth control valve 208 and a tenth control valve 209 are provided on the seventh water pipe.

[0057] In this embodiment, an eighth water pipe is provided between the second converging water pipe 205 and the second heat exchanger 204 , and a second water pump 210 , an eleventh control valve 211 and a twelfth control valve 212 are sequentially provided on the eighth water pipe.

[0058] In this embodiment, the switching system includes a first switching valve 7, a second switching valve 8 and a third switching valve 9. The first switching valve 7 is arranged between the first water pipe and the fifth water pipe, the water inlet end of the first switching valve 7 is arranged between the seventh control valve 206 and the eighth control valve 207, the water outlet end of the first switching valve 7 is arranged between the first control valve 107 and the second control valve 108, the second switching valve 8 is arranged between the third water pipe and the seventh water pipe, the water inlet end of the second switching valve 8 is arranged between the ninth control valve 208 and the tenth control valve 209, the water outlet end of the second switching valve 8 is arranged between the third control valve 109 and the fourth control valve 110, the third switching valve 9 is arranged between the fourth water pipe and the eighth water pipe, the water inlet end of the third switching valve 9 is arranged between the fifth control valve 112 and the sixth control valve 113, and the water outlet end of the third switching valve 9 is arranged between the eleventh control valve 211 and the twelfth control valve 212.

[0059] In this embodiment, the first heat exchanger and the second heat exchanger are plate heat exchangers.

[0060] In this embodiment, the control valve in the switching system is a butterfly valve.

[0061] In summary, the purification circulation device is connected to the production equipment, and the production equipment includes a die head 10, a casting air knife 11, a dewatering air knife 12, a dewatering pressure roller 13, and a peeling roller 14 arranged on the first water bath 1, and a thick sheet guide roller 15, a guide roller pressure roller 16 and a plurality of guide rollers 17 arranged on the second water bath 2.

[0062] During the casting process, the polyolefin melt flows out from the die head 10, is pulled by the chilled roller 3, and enters the first water bath 1 under the coordinated attachment of the casting air knife 11. The first water sprayer 5 can spray water to cool the melt, and crystallize and cool it in the first water bath 1. After the casting is initially crystallized and cooled, it bypasses the stripping roller 14 and enters the second water bath 2. The casting is sprayed with water by the second water sprayer 6. The casting bypasses the two casting guide rollers 4 in turn, and continues to crystallize and cool in the second water bath 2. After two water bath treatments, the casting becomes a thick sheet, and finally bypasses the thick sheet guide roller 15 and the guide roller pressure roller 16 and the three guide rollers 17 to enter the next processing step.

[0063] The working process of the first purification circulation system is as follows: the deionized water in the first water bath 1 enters the first water pipe through the first overflow port 101, enters the first purified water tank 103 through the first control valve 107 and the second control valve 108, flows out of the first purified water tank 103 after purification treatment and merges with the outlet water of the first reflux port 102 to enter the first water pump 111; the deionized water is discharged from the first water pump 111 and passes through the fifth control valve 112, the sixth control valve 113, the first heat exchanger 104 and the heater 106 in sequence, and finally enters the first water sprayer 5, and then cools the polyolefin melt in the first water bath 1. This cycle works to maintain continuous production.

[0064] The working process of the second purification circulation system is as follows: the deionized water in the second water bath 2 enters the fifth water pipe through the second overflow port 201, enters the second purified water tank 203 through the seventh control valve 206 and the eighth control valve 207, flows out after purification and merges with the outlet water of the second reflux port 202 to enter the second water pump 210; the deionized water is discharged from the second water pump 210 and passes through the eleventh control valve 211, the twelfth control valve 212 and the second heat exchanger 204 in sequence, and finally enters the second water sprayer 6, and enters the second water bath 2 to cool the polyolefin melt. This cycle works to maintain continuous production.

[0065] The above working process is an independent operation mode of two purification circulation systems.

[0066] The workflow of the optimized operation mode of the purification circulation device is: open the first switching valve 7, the second switching valve 8 and the third switching valve 9, and close the eighth control valve 207, the tenth control valve 209 and the eleventh control valve 211. In this way, the deionized water can be driven by the first water pump 111 to purify and circulate in the two water baths. At the same time, the deionized water in the first water bath 1 enters the first purified water tank 103 from the first overflow port 101, and the water flowing out of the second overflow port 201 enters the second control valve through the seventh control valve 206 and the first switching valve 7 and finally merges into the first purified water tank 103; the water flowing out of the first purified water tank and the water entering the third water pipe enter the first water pump 111, and the water flowing in the seventh water pipe passes through the ninth control valve 208, The second switching valve 8 and the fourth control valve 110 are connected to the first water pump 111; the water flowing out of the first water pump 111 enters the first water sprayer 5 through the fifth control valve 112, the sixth control valve 113, the first heat exchanger 104 and the heater 106, so as to cool the melt in the first water bath 1. In addition, part of the water flowing out of the fifth control valve 112 enters the second water sprayer 6 through the third switching valve 9, the twelfth control valve 212 and the second heat exchanger 204, so as to cool the melt in the second water bath 2. The cycle works in this way to maintain continuous production.

[0067] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A water bath purification circulation device for compatible production of BOPP and BOPE films, characterized in that: include: A first water bath tank, used for placing a chilled roller, wherein the first water bath tank is provided with a first overflow port and a first reflux port; A second water bath, used for placing the casting guide roller, wherein the second water bath is provided with a second overflow port and a second reflux port; A first purification circulation system comprises a first purified water tank and a first heat exchanger, wherein the first overflow port is connected to a water inlet of the first purified water tank, a water outlet of the first purified water tank and the first reflux port are connected to a water inlet of the first heat exchanger through a first converging water pipe, and the first heat exchanger is connected to a first water sprayer disposed in the first water bath through a heater; a second purification circulation system, comprising a second purified water tank and a second heat exchanger, wherein the second overflow port is connected to a water inlet of the second purified water tank, a water outlet of the second purified water tank and the second reflux port are connected to a water inlet of the second heat exchanger through a second converging water pipe, and the second heat exchanger is connected to a second water sprayer disposed in the second water bath; The switching system includes a plurality of control valves arranged between the first purification circulation system and the second purification circulation system.

2. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 1, characterized in that: A first water pipe is arranged between the first overflow port and the first purified water tank, a first control valve and a second control valve are arranged on the first water pipe, and a second water pipe is arranged between the first purified water tank and the first confluent water pipe.

3. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 2, characterized in that: A third water pipe is arranged between the first reflux port and the first converging water pipe, and a third control valve and a fourth control valve are arranged on the third water pipe.

4. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 3, characterized in that: A fourth water pipe is arranged between the first merging water pipe and the first heat exchanger, and a first water pump, a fifth control valve and a sixth control valve are arranged in sequence on the fourth water pipe.

5. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 4, characterized in that: A fifth water pipe is arranged between the second overflow port and the second purified water tank, a seventh control valve and an eighth control valve are arranged on the fifth water pipe, and a sixth water pipe is arranged between the second purified water tank and the second confluent water pipe.

6. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 5, characterized in that: A seventh water pipe is provided between the second reflux port and the second converging water pipe, and a ninth control valve and a tenth control valve are provided on the seventh water pipe.

7. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 6, characterized in that: An eighth water pipe is arranged between the second merging water pipe and the second heat exchanger, and a second water pump, an eleventh control valve and a twelfth control valve are arranged in sequence on the eighth water pipe.

8. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 7, characterized in that: The switching system includes a first switching valve, a second switching valve and a third switching valve. The first switching valve is arranged between the first water pipe and the fifth water pipe, the second switching valve is arranged between the third water pipe and the seventh water pipe, and the third switching valve is arranged between the fourth water pipe and the eighth water pipe.

9. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 1, characterized in that: The first heat exchanger and the second heat exchanger are plate heat exchangers.

10. The water bath purification circulation device for compatible production of BOPP and BOPE films according to claim 1, characterized in that: The control valve in the switching system is a butterfly valve.

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