Blow molding machine and method for molding antibacterial polyurethane packaging film

Abstract

The present invention relates to the field of film manufacturing, and specifically to a blow molding machine and a molding method of an antibacterial polyurethane packaging film, comprising a blowing unit, a winding unit and a conveying unit; the winding unit comprises a vertically arranged winding chamber, an opening is arranged at the upper part of the winding chamber, a first fan is arranged on the side walls on both sides of the winding chamber, the first fan is used to extract the gas in the winding chamber, an extrusion plate is arranged on the side wall of the winding chamber to move in the horizontal direction, the extrusion plate can change the volume in the winding chamber when it moves in the horizontal direction, the first fans located on both sides of the winding chamber are arranged symmetrically about the extrusion plate, when the extrusion plate moves toward the conveying unit, the volume in the winding chamber decreases, when the extrusion plate moves in the direction away from the conveying unit, the volume in the winding chamber increases, and a pressing unit is arranged on the side of the extrusion plate facing the winding chamber. The present invention achieves the effect of automatic correction of the film side edge after flanging.

Description

Technical Field

[0001] The invention relates to the field of film manufacturing, in particular to a blow molding machine and a molding method of an antibacterial polyurethane packaging film. Background Art

[0002] During the film blowing process, the width and thickness of the finished product are critical to production. First of all, if the width of the film does not meet the requirements, it will not meet the needs of users. For example, various bags, cling films and other products have fixed sizes, and they cannot or are inconvenient to use if they exceed the size. If the film is too thick, it will waste raw materials, increase costs and may affect the use. If the film is too thin, garbage bags and shopping bags made of the film will be easily damaged. However, the effect of controlling the width of the film is poor and complicated at this stage. In addition, the cost of directly detecting the thickness of the film in production is too high.

[0003] Chinese patent application CN115042419A discloses a film blowing device, including a frame, a control system, a feeding device, a blowing device, a traction device, and a discharging device. The blowing device, the traction device, and the discharging device are mounted on the frame. The control system is electrically connected to the feeding device, the blowing device, the traction device, and the discharging device. The feeding device is used for feeding. The blowing device is used for blowing the raw materials after feeding into a film, and the blowing device includes an automatic gas filling and exhausting device, and the automatic gas filling and exhausting device performs gas filling and exhausting according to the instructions of the control system. The traction device is used for leading out the film after blowing. The discharging device is used for leading out the film after leading out, and the discharging device includes a width measuring device for measuring the width of the film.

[0004] The above scheme adjusts the thickness and width of the film by the amount of air blown, and is also a method commonly used in the prior art to adjust the thickness and width of the film. When producing the film, the blown film needs to undergo a series of tests such as thickness and quality. At the same time, the film after the test needs to be able to be smoothly rolled up. In the prior art, the blown film needs to be manually rolled up in the winding device. When the film is manually rolled up, the film is prone to slipping and cannot be wound around the winding device. At the same time, the film may be accidentally scratched during rolling. Moreover, the film is always in a running state when it is rolled up, which has certain operational risks. Summary of the invention

[0005] In view of the above problems, a blow molding machine and a molding method of an antibacterial polyurethane packaging film are provided. First, a conveying unit conveys the film to a winding unit, and one end of the newly produced film moves to the opening of a winding chamber. At this time, the bottom of the winding chamber is in a sealed state. The first fans arranged on both sides of the winding chamber are started at the same time. The first fans form an airflow flowing from top to bottom in the winding chamber in a vertical direction. In this way, one end of the film can be sucked into the winding chamber by the flowing air when it reaches the opening of the winding chamber. Then, the film gradually descends in the winding chamber in a vertical direction. At the same time, an extrusion plate moves toward the conveying unit. The distance between the extrusion plate and the winding chamber is set to a, and the thickness of the film is set to b. a is two to three times of b, and a is greater than 2b. The specific multiple relationship needs to be set according to the actual production situation. This is because during the conveying process of the film, the side of the film will only be folded once if it is flanging, and it is difficult to fold multiple times. Therefore, setting the size of a to two to three times of b can ensure that the folded film will not be squeezed. The plate is completely extruded, and the purpose of setting a to be greater than 2b is to ensure that the film entering the winding chamber can be smoothly flanged by the first fan. If there are flanges on the sides of the film, after the extrusion plate squeezes the space in the winding chamber, the pressing unit arranged on the extrusion plate will also press the middle part of the film. The pressing position of the pressing unit and the film will evenly divide the film into two parts. At this time, the flanges on both sides of the film in the winding chamber are in an inclined state, that is, the folding amount of the flange on the film from the end position of the film toward the extension direction of the film gradually decreases, so that the folding amount of the side of the film in the winding chamber is greater than the folding amount of the film at the opening. In this way, the surface of the film after folding is bound to be uneven, and the outside air can enter the winding chamber through the opening. The first fans arranged on both sides of the winding chamber have a guiding effect on the flow direction of the airflow in the winding chamber. In this way, under the pressure of the pressing unit, the flowing airflow can reset and correct the folded side of the film, so as to achieve the effect of automatic correction after the side of the film is flanged.

[0006] In order to solve the problems of the prior art, the present invention provides a blow molding machine, comprising a blowing unit, a winding unit and a conveying unit for conveying the film blown out by the blowing unit to the winding unit; the winding unit comprises a vertically arranged winding chamber, an opening is arranged at the upper part of the winding chamber, and the film enters the winding chamber through the opening, and a first fan is arranged on the side walls on both sides of the winding chamber, the first fan is used to extract the gas in the winding chamber, and an extrusion plate is arranged on the side wall of the winding chamber for movement in the horizontal direction, and the extrusion plate can change the volume in the winding chamber when it moves in the horizontal direction, and the first fans located on both sides of the winding chamber are arranged symmetrically about the extrusion plate, when the extrusion plate moves toward the conveying unit, the volume in the winding chamber decreases, and when the extrusion plate moves in the direction away from the conveying unit, the volume in the winding chamber increases, and a pressing unit is arranged on the side of the extrusion plate facing the winding chamber, and the pressing unit presses the middle part of the film entering the winding chamber.

[0007] Preferably, a first rotating roller and a second rotating roller are respectively arranged to rotate in the vertical direction at the opening, the first rotating roller is located at the lower part of the second rotating roller, the upper part of the first rotating roller is used to receive the film, a plurality of ventilation holes are evenly opened in the middle part of the second rotating roller, the second rotating roller is arranged to move in the vertical direction at the upper part of the first rotating roller, when the second rotating roller is at the highest position, the opening is the largest, after the second rotating roller descends and contacts with the film, the external airflow enters the winding chamber through the ventilation holes on the second rotating roller and is discharged.

[0008] Preferably, the horizontal distance between the extrusion plate and the side wall of the winding chamber is a, the thickness of the film is b, and 2b<a<3b.

[0009] Preferably, there are multiple first fans arranged on the side of the winding chamber in the vertical direction. After the end of the film enters the winding chamber, the first fans vertically arranged on the side of the winding chamber are started from top to bottom in sequence. When the end of the film drops to the bottom of the winding chamber, all the first fans are started.

[0010] Preferably, an adsorption unit is provided on the side wall of the winding chamber away from the extrusion plate, the adsorption unit includes adsorption rollers arranged in a vertical direction, a through hole is provided on the adsorption roller along the axial direction of the adsorption tube, a first adsorption hole is provided on the side wall of the through hole, an adsorption belt is provided on the outer periphery of all the adsorption rollers, a second adsorption hole is provided on the adsorption belt, the first adsorption hole and the second adsorption hole can overlap when the adsorption roller and the adsorption belt are driven in coordination, the side of the adsorption belt facing the winding chamber is a vertical end face structure, fans are provided at both ends of the through hole, one fan injects outside air into the through hole, and the other fan draws the air out of the through hole, and the air flow rate in the through hole is greater than the air flow rate in the winding chamber.

[0011] Preferably, the rotation speed of the adsorption belt is the same as the conveying speed of the conveying unit when conveying the film.

[0012] Preferably, the pressing unit includes a pressing belt rotatably arranged on the extrusion plate, the pressing belt is located on the side of the extrusion plate facing the winding chamber, a translation plate is arranged on the side of the extrusion plate away from the pressing belt, the translation plate moves in a horizontal direction, and there is a gap between the extrusion plate and the translation plate, an extension rod is horizontally fixedly arranged on the side of the extrusion plate facing the translation plate, the extension rod passes through the translation plate, a spring is arranged in the gap, the spring is sleeved on the periphery of the extension rod, and the two ends of the spring are respectively fixedly connected to the flat plate and the extrusion plate, when the pressing belt is not pressed against the film, the extrusion plate and the translation plate move synchronously and the gap between the extrusion plate and the translation plate remains unchanged, after the pressing belt contacts the film, the gap between the translation plate and the extrusion plate is reduced, and a first linear drive for driving the translation plate to move is horizontally arranged at the end of the translation plate away from the extrusion plate.

[0013] Preferably, a winding unit is provided at the lower portion of the winding chamber, the winding unit comprising a winding roller and a second fan, winding holes are evenly opened on the winding roller, the second fan is provided at the end of the winding roller, the second fan draws external air into the winding roller from the outside to the inside through the winding holes, a moving unit is obliquely provided at one end of the winding roller, the moving unit is used to drive the winding roller to move along the inclination direction of the moving unit, and the winding roller can be moved to the bottom of the winding chamber under the drive of the moving unit.

[0014] Preferably, a blocking unit is provided at the bottom of the winding chamber, and the blocking unit includes a blocking plate moving in a horizontal direction and a second linear drive horizontally arranged on one side of the blocking plate. The output end of the second linear drive is fixedly connected to the blocking plate. When the film has a flange, the blocking unit blocks the bottom of the winding chamber. After the film flange is completed, the blocking unit opens the bottom of the winding chamber.

[0015] The present invention also relates to a method for forming an antibacterial polyurethane packaging film, which uses a blow molding machine, and the specific steps are as follows:

[0016] S1. The conveying unit conveys the film from the blowing unit to the winding unit. At this time, the bottom of the winding chamber is in a sealed state, and the first fan is started. The first fan generates an airflow flowing from top to bottom in the vertical direction in the winding chamber, and the film is sucked into the winding chamber.

[0017] S2, the opening is blocked, the film continues to move in the vertical direction in the winding chamber, the extrusion plate moves toward the conveying unit, the volume of the winding chamber is reduced, and at the same time, the pressing unit arranged on the extrusion plate presses the middle part of the film. If there is a curling phenomenon on the sides of the film, the airflow from top to bottom will blow the curled side walls straight and reset them, thus realizing automatic flanging correction of the side edges of the film.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. First, the conveying unit conveys the film to the winding unit, and one end of the newly produced film moves to the opening of the winding chamber. At this time, the bottom of the winding chamber is in a sealed state, and the first fans arranged on both sides of the winding chamber are started at the same time. The first fans form an airflow flowing from top to bottom in the vertical direction in the winding chamber, so that one end of the film can be sucked into the winding chamber by the flowing air when it reaches the opening of the winding chamber, and then the film gradually descends in the winding chamber along the vertical direction. At the same time, the extrusion plate moves toward the direction of the conveying unit, and the distance between the extrusion plate and the winding chamber is set to a, and the thickness of the film is set to b, a is two to three times b, and a is greater than 2b. The specific multiple relationship needs to be set according to the actual production situation. This is because during the conveying process of the film, the side of the film will only be folded once if it is flanging, and it is difficult to fold multiple times. In this way, setting the size of a to two to three times of b can ensure that the folded film will not be completely squeezed by the extrusion plate, and setting a to be greater than 2 The purpose of b is to ensure that the film entering the winding chamber can be smoothly flanged by the first fan. If there are flanges on the sides of the film, after the extrusion plate squeezes the space in the winding chamber, the pressing unit arranged on the extrusion plate will also press the middle of the film. The pressing position of the pressing unit and the film will evenly divide the film into two parts. At this time, the flanges on both sides of the film in the winding chamber are in an inclined state, that is, the folding amount of the flange on the film gradually decreases from the end position of the film toward the extension direction of the film. In this way, the folding amount of the film side in the winding chamber will be greater than the folding amount of the film at the opening. In this way, the surface of the film after folding is bound to be uneven, and the outside air can enter the winding chamber through the opening. The first fans arranged on both sides of the winding chamber have a guiding effect on the airflow direction in the winding chamber. In this way, under the pressure of the pressing unit, the flowing airflow can reset and correct the folded side of the film, thereby achieving the effect of automatic correction of the film side after flanged.

[0020] 2. By arranging the first rotating roller and the second rotating roller at the opening, and opening a vent hole in the middle of the second rotating roller to connect the winding chamber with the outside, it is ensured that the outside air can flow from the middle position of the film to the two sides of the film during the process of entering the winding chamber through the vent hole and being discharged through the first fan, so that the folded side of the film can be smoothly corrected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of a blow molding machine.

[0022] Figure 2 It is a blow molding machine Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] Figure 3 It is a side view of a blow molding machine.

[0024] Figure 4 It is a blow molding machine Figure 3 Schematic cross-sectional view at the middle BB.

[0025] Figure 5 It is a blow molding machine Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0026] Figure 6 A cutaway perspective view of a blow molding machine Figure 1 .

[0027] Figure 7 It is a blow molding machine Figure 6 A partial enlarged schematic diagram of point D in the middle.

[0028] Figure 8 A cutaway perspective view of a blow molding machine Figure 2 .

[0029] Fig. 9 It is a blow molding machine Figure 8 A partial enlarged schematic diagram of point E in the middle.

[0030] Fig.10 It is a three-dimensional schematic diagram of a blow molding machine with the outer shell of the winding unit removed.

[0031] Fig.11 It is a blow molding machine Fig.10 A partial enlarged schematic diagram of point F in the middle.

[0032] Fig.12 The present invention is a three-dimensional schematic diagram of a blow molding machine with the outer shells of a conveying unit and a winding unit removed.

[0033] The numbers in the figure are:

[0034] 1. Winding chamber; 11. Opening; 12. First rotating roller; 13. Second rotating roller; 131. Ventilation hole; 14. Adsorption unit; 141. Adsorption roller; 1411. Through hole; 142. Adsorption belt; 143. Fan; 144. Synchronous belt; 145. Synchronous wheel; 146. First rotary driver; 2. First fan; 3. Extrusion plate; 4. Pressing unit; 41. Pressing belt; 42. Translation plate; 43. Extension rod; 44. Spring; 45. First linear driver; 46. Pressing wheel; 5. Conveying unit; 6. Film; 7. Winding unit; 71. Winding roller; 72. Second fan; 73. Moving unit; 74. Second rotary driver; 75. Gear; 76. Gear ring; 8. Blocking unit; 81. Blocking plate; 82. Second linear driver. DETAILED DESCRIPTION

[0035] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Reference Figure 1 , Figure 4 and Figure 8 : A blow molding machine, comprising a blowing unit, a winding unit and a conveying unit 5 for conveying a film 6 blown out by the blowing unit to the winding unit; the winding unit comprises a vertically arranged winding chamber 1, an opening 11 is arranged at the upper part of the winding chamber 1, and the film 6 enters the winding chamber 1 through the opening 11, and a first fan 2 is arranged on the side walls on both sides of the winding chamber 1, and the first fan 2 is used to extract the gas in the winding chamber 1, and an extrusion plate 3 is arranged on the side wall of the winding chamber 1 to move in the horizontal direction, and the extrusion plate 3 can change the volume in the winding chamber 1 when it moves in the horizontal direction, and the first fans 2 located on both sides of the winding chamber 1 are arranged symmetrically about the extrusion plate 3, when the extrusion plate 3 moves toward the conveying unit 5, the volume in the winding chamber 1 decreases, and when the extrusion plate 3 moves in the direction away from the conveying unit 5, the volume in the winding chamber 1 increases, and a pressing unit 4 is arranged on the side of the extrusion plate 3 facing the winding chamber 1, and the pressing unit 4 presses the middle part of the film 6 entering the winding chamber 1.

[0037] In the traditional film 6 production process, the finished film 6 is usually rolled up by the winding roller 71, but before rolling up the film 6, it is necessary to ensure that the side edges of the film 6 will not be flanged, otherwise, after winding multiple rolls, the film 6 will have a small diameter in the middle and large diameters on both sides of the film 6. In order to avoid the above situation, it is necessary to pay more attention when winding the film 6. After the equipment is turned on, the winding roller 71 is continuously in a rotating state, and the peripheral wall of the winding roller 71 itself is relatively smooth. Sufficient experience is required when winding one end of the film 6 on the winding roller 71, otherwise the winding will fail. During winding, the rotating winding roller 71 poses certain production risks, and the staff are easily distracted during operation. The winding roller 71 is wound and damaged, so the winding unit is improved. First, the side edge of the film 6 is easily flanging during transportation, and the specific working principle is as follows: first, the conveying unit 5 conveys the film 6 to the winding unit, and one end of the newly produced film 6 moves to the opening 11 of the winding chamber 1. At this time, the bottom of the winding chamber 1 is in a sealed state, and the first fans 2 arranged on both sides of the winding chamber 1 are started at the same time. The first fan 2 forms an airflow flowing from top to bottom in the winding chamber 1 in the vertical direction. In this way, one end of the film 6 can be sucked into the winding chamber 1 by the flowing air when it reaches the opening 11 of the winding chamber 1, and then the film 6 gradually descends in the winding chamber 1 in the vertical direction, and at the same time, the extrusion plate 3 moves toward the conveying unit 5. The distance between the extrusion plate 3 and the winding chamber 1 is set to a, and the thickness of the film 6 is set to b, a is two to three times of b, and a is greater than 2b. The specific multiple relationship needs to be set according to the actual production situation. This is because during the transportation of the film, the side of the film 6 will only be folded once if it is flanging, and it is difficult to fold multiple times. In this way, setting the size of a to two to three times of b can ensure that the folded film 6 will not be completely squeezed by the extrusion plate 3. The purpose of setting a to be greater than 2b is to ensure that the film 6 entering the winding chamber 1 can be smoothly flanging by the first fan 2. If there is flanging on the sides of both sides of the film 6, after the extrusion plate 3 squeezes the space in the winding chamber 1, the pressing unit 4 set on the extrusion plate 3 will also press the film 6 The middle part of the film 6 is pressed, and the pressing position of the pressing unit 4 and the film 6 evenly divides the film 6 into two parts. At this time, the two side flanges of the film 6 located in the winding chamber 1 are in an inclined state, that is, the folding amount of the flange on the film 6 gradually decreases from the end position of the film 6 toward the extension direction of the film 6. In this way, the folding amount of the side of the film 6 located in the winding chamber 1 will be greater than the folding amount of the film 6 located at the opening 11. In this way, the surface of the folded film 6 is inevitably uneven, and the outside air can enter the winding chamber 1 through the opening 11. The first fans 2 arranged on both sides of the winding chamber 1 have a guiding effect on the airflow direction in the winding chamber 1. In this way, under the pressure of the pressing unit 4, the flowing airflow can reset and correct the side of the folded film 6.In this way, the effect of automatic correction of the side edge of the film 6 after flanging is achieved.

[0038] Reference Figure 4 and Figure 5 : A first rotating roller 12 and a second rotating roller 13 are respectively arranged to rotate in the vertical direction at the opening 11, the first rotating roller 12 is located at the lower part of the second rotating roller 13, the upper part of the first rotating roller 12 is used to receive the film 6, and a plurality of ventilation holes 131 are evenly opened in the middle part of the second rotating roller 13, the second rotating roller 13 is arranged to move in the vertical direction at the upper part of the first rotating roller 12, when the second rotating roller 13 is at the highest position, the opening 11 is the largest, after the second rotating roller 13 descends and contacts with the film 6, the external airflow enters the winding chamber 1 through the ventilation holes 131 on the second rotating roller 13 and is discharged.

[0039] A slide is vertically arranged at the end of the second rotating roller 13, and the slide is used to drive the second rotating roller 13 to move in the vertical direction. A first pressure sensor is arranged on the peripheral wall of the second rotating roller 13. After the first pressure sensor detects the pressure, the slide stops running. The film 6 will often be flanging during the transportation process, and since the film 6 is just produced, there is no crease on the surface of the film 6, so the flanging of the film 6 will basically only be folded once. Before the end of the film 6 enters the winding chamber 1 from the opening 11, the second rotating roller 13 is in the highest position. At this time, the opening 11 is the largest, and the first fan 2 has started to run, so as to ensure that the end of the film 6 can be more easily sucked into the winding chamber 1. When the end of the film 6 is sucked into the winding chamber 1, the second rotating roller 13 starts to descend. For the relevant device for monitoring whether the film 6 is sucked into the winding chamber 1, a camera can be used. First, whether there is any film 6 entering the winding chamber 1 is monitored, which will not be elaborated here. When the second rotating roller 13 contacts the film 6, it stops moving. At this time, the opening 11 is blocked by the film 6, and only a small amount of air can flow into the winding chamber 1 through the gap, and the outside air mainly flows into the winding chamber 1 through the vent 131 on the second rotating roller 13. Since the vent 131 is arranged in the middle of the second rotating roller 13, the outside air is mostly located in the middle position of the winding chamber 1 when entering the winding chamber 1 through the vent 131. Under the action of the first fan 2, the air entering the winding chamber 1 needs to be discharged again. When the first fan 2 draws the air out of the winding chamber 1, the flowing air can restore the folded film 6 to its original position. When the side edge of the film 6 is completely restored, the side edge of the film 6 is in a flat state, that is, at this time, the side edge of the film 6 no longer has a flange.

[0040] Reference Figure 1-Figure 12 : The horizontal distance between the extrusion plate 3 and the side wall of the winding chamber 1 is a, the thickness of the film 6 is b, and 2b<a<3b.

[0041] Since the surface of the newly produced film 6 is flat, that is, there will be no creases on the surface of the film 6, even if the film 6 is folded during the transportation process, it can usually only be folded once. In this way, 2b<a is to ensure that after the extrusion plate 3 squeezes the winding chamber 1, the air flowing in the winding chamber 1 has enough reserved space to correct the side of the folded film 6. If 2b=a, the extrusion plate 3 will completely press the side of the folded film 6, and the airflow cannot correct the side of the folded film 6. The purpose of a<3b is to ensure that most of the air flowing in the winding chamber 1 can be around the flange of the film 6. If the horizontal distance between the extrusion plate 3 and the side wall of the winding chamber 1 is set too large, the air in the winding chamber 1 can pass over the folded part of the film 6 and be discharged from the first fan 2, so the folding effect is greatly reduced.

[0042] Reference Figure 1-Figure 12 : There are multiple first fans 2 arranged on the side of the winding chamber 1 in the vertical direction. After the end of the film 6 enters the winding chamber 1, the first fans 2 vertically arranged on the side of the winding chamber 1 are started from top to bottom in sequence. When the end of the film 6 drops to the bottom of the winding chamber 1, all the first fans 2 are started.

[0043] Since the conveying speed of the conveying unit 5 is constant, when the conveying unit 5 conveys the film 6 into the winding chamber 1, the moving speed of the film 6 in the vertical direction in the winding chamber 1 is constant and can be known in advance, so the first fan 2 can be preset. When the end of the film 6 just enters the winding chamber 1, only the topmost first fan 2 of the first fans 2 arranged in the vertical direction is in operation. If all the first fans 2 are in operation at this time, the air flowing into the winding chamber 1 through the vents 131 on the second rotating roller 13 will be sucked away by the first fans 2 arranged in the lower layer. This is because When the film 6 just enters the winding chamber 1, only the first fan 2 on the uppermost side is in operation, and the outside air enters the winding chamber 1 from the vent 131 and is discharged through the first fan 2. All the air entering the winding chamber 1 from the vent 131 needs to be discharged from the first fan 2 on the uppermost side. If the film 6 has a flange, the air entering the winding chamber 1 needs to first bypass the lower end of the film 6 and then rise to the first fan 2 before it can be discharged. In this way, the air flowing at the folded edge position of the end of the film 6 can push the folded edge of the film 6, so that the folded edge of the side of the film 6 can be corrected.

[0044] Reference Figure 2 , Figure 6 , Figure 7 and Figure 8: An adsorption unit 14 is arranged on the side wall of the winding chamber 1 away from the extrusion plate 3, and the adsorption unit 14 includes an adsorption roller 141 arranged in a vertical direction, and a through hole 1411 is penetrated on the adsorption roller 141 along the axial direction of the adsorption tube, and a first adsorption hole is arranged on the side wall of the through hole 1411, and an adsorption belt 142 is sleeved on the outer periphery of all the adsorption rollers 141, and a second adsorption hole is arranged on the adsorption belt 142, and the first adsorption hole and the second adsorption hole can overlap when the adsorption roller 141 and the adsorption belt 142 are in transmission cooperation, and the side of the adsorption belt 142 facing the winding chamber 1 is a vertical end face structure, and fans 143 are respectively arranged at both ends of the through hole 1411, one of the fans 143 injects external air into the through hole 1411, and the other fan 143 draws the air out of the through hole 1411, and the air flow rate in the through hole 1411 is greater than the air flow rate in the winding chamber 1.

[0045] The adsorption unit 14 also includes a synchronous wheel 145, a synchronous belt 144 and a first rotation driver 146. The synchronous wheel 145 is fixedly arranged at the end of the adsorption roller 141. The synchronous belt 144 is sleeved on all the synchronous wheels 145 and cooperates with the synchronous wheel 145 in transmission. The wrap angle between the synchronous wheel 145 and the synchronous belt 144 is not zero. The first rotation driver 146 is arranged on one of the synchronous wheels 145. The first rotation driver 146 is used to drive the synchronous wheel 145 to rotate. The first rotation driver 146 is preferably a servo motor. When the film 6 enters the winding chamber 1, the two fans 143 arranged on the through hole 1411 are started at the same time. The air flow rate in the through hole 1411 continues to increase. Since the space in the winding chamber 1 is small, the film in the winding chamber 1 6 can be adsorbed on the adsorption belt 142, and under the adsorption effect of the second adsorption hole on the adsorption belt 142, the film 6 entering the winding chamber 1 cannot be further flanging even if it has flanged. This is because if the side edge of the film 6 needs to continue to be flanging, it is necessary to overcome the suction force at the second adsorption hole, and the film 6 is light in weight. After the second adsorption hole generates suction on the film 6, it is difficult for the film 6 to detach on its own. This not only ensures that the film 6 does not further flanging, but also avoids the secondary flanging of the film 6 after correction. Moreover, since the adsorption belt 142 is in a rotating state under the action of the adsorption roller 141, and the rotation speed of the adsorption belt 142 is the same as the rotation speed of the conveying unit 5, it is convenient for the film 6 entering the winding chamber 1 to move smoothly.

[0046] Reference Figure 1-Figure 12 : The rotation speed of the suction belt 142 is the same as the conveying speed of the conveying unit 5 when conveying the film 6.

[0047] Reference Figure 7 and Fig. 9: The pressing unit 4 includes a pressing belt 41 rotatably arranged on the extrusion plate 3, the pressing belt 41 is located on the side of the extrusion plate 3 facing the winding chamber 1, and a translation plate 42 is arranged on the side of the extrusion plate 3 away from the pressing belt 41. The translation plate 42 moves in the horizontal direction, and there is a gap between the extrusion plate 3 and the translation plate 42. An extension rod 43 is horizontally fixedly arranged on the side of the extrusion plate 3 facing the translation plate 42, and the extension rod 43 penetrates the translation plate 42. A spring 44 is arranged in the gap, and the spring 44 is sleeved on the periphery of the extension rod 43, and the two ends of the spring 44 are respectively fixedly connected to the flat plate and the extrusion plate 3. When the pressing belt 41 is not pressed by the film 6, the extrusion plate 3 and the translation plate 42 move synchronously and the gap between the extrusion plate 3 and the translation plate 42 remains unchanged. After the pressing belt 41 contacts the film 6, the gap between the translation plate 42 and the extrusion plate 3 is reduced, and a first linear drive 45 for driving the translation plate 42 to move is horizontally arranged at one end of the translation plate 42 away from the extrusion plate 3.

[0048] A plurality of pressing wheels 46 are arranged along the vertical direction on the extrusion plate 3, and the pressing wheel 46 is rotatably set on the extrusion plate 3. A motor for driving the pressing wheel 46 to rotate is set at the end of the pressing wheel 46, and the pressing belt 41 is sleeved on the pressing wheel 46 and the pressing belt 41 and the pressing wheel 46 are matched in transmission. A second pressure sensor is provided at the connection between the translation plate 42 and the spring 44, and the second pressure sensor is preset with a rated pressure. After the pressing belt 41 contacts with the film 6, the second pressure sensor can monitor the pressure value, and the pressure value continues to rise, the output end of the first linear drive 45 continues to extend, the gap between the translation plate 42 and the extrusion plate 3 is reduced, and the spring 44 is continuously compressed. When the pressure value monitored by the second pressure sensor reaches the rated pressure, the first linear drive 45 stops running. After the pressing belt 41 presses the film 6, the pressing belt 41 rotates synchronously with the adsorption belt 142, thereby ensuring that the film 6 in the winding chamber 1 descends smoothly.

[0049] Reference Figure 10-12 A winding unit 7 is provided at the lower part of the winding chamber 1, and the winding unit 7 includes a winding roller 71 and a second fan 72. Winding holes are evenly opened on the winding roller 71, and the second fan 72 is arranged at the end of the winding roller 71. The second fan 72 draws external air into the winding roller 71 from the outside to the inside through the winding holes. A moving unit 73 is obliquely provided at one end of the winding roller 71. The moving unit 73 is used to drive the winding roller 71 to move along the inclined direction of the moving unit 73. Driven by the moving unit 73, the winding roller 71 can move to the bottom of the winding chamber 1.

[0050] The moving unit 73 is preferably a linear slide, and the winding unit 7 also includes a second rotary driver 74, a gear 75 and a gear ring 76. The gear ring 76 is fixedly arranged at the end of the winding roller 71, and the gear 75 is rotatably arranged on one side of the gear ring 76. The gear 75 and the gear ring 76 are meshed with each other. The second rotary driver 74 is arranged at the end of the gear 75. The second rotary driver 74 drives the gear 75 to rotate. The second rotary driver 74 is preferably a servo motor. When the second rotary driver 74 is started, the gear 75 can drive the gear ring 76 to rotate. The rotation speed of the winding roller 71 needs to be changed according to the preset rotation speed. After the flanging is corrected, the moving unit 73 drives the winding roller 71 to move to the bottom of the winding chamber 1. The film 6 is discharged from the bottom of the winding chamber 1 and adsorbed on the winding roller 71. This is because the second fan 72 continuously extracts the air in the winding roller 71, so that the film 6 is adsorbed on the winding hole of the winding roller 71, and as the film 6 is wound, the adsorption force of the winding hole on the winding roller 71 for the film 6 gradually increases. This is because the film 6 will gradually block the winding hole when rotating around the winding roller 71, so the suction force of the winding hole gradually increases, avoiding the situation where the film 6 cannot be smoothly wound on the winding roller 71 when it needs to be wound.

[0051] Reference Figure 6 and Figure 7 : A blocking unit 8 is arranged at the bottom of the winding chamber 1, and the blocking unit 8 includes a blocking plate 81 moving in the horizontal direction and a second linear drive 82 horizontally arranged on one side of the blocking plate 81. The output end of the second linear drive 82 is fixedly connected to the blocking plate 81. When the film 6 has a flange, the blocking unit 8 blocks the bottom of the winding chamber 1. After the film 6 is flanged, the blocking unit 8 opens the bottom of the winding chamber 1.

[0052] The film 6 after the flanging is completed in this way can enter the winding unit 7 from the bottom of the winding chamber 1 and be wound up by the winding roller 71.

[0053] Reference Figure 1-Figure 12 The present invention also relates to a method for forming an antibacterial polyurethane packaging film, which adopts a blow molding machine, and the specific steps are as follows:

[0054] S1, the conveying unit 5 conveys the film 6 from the blowing unit to the winding unit. At this time, the bottom of the winding chamber 1 is in a sealed state, the first fan 2 is started, and the first fan 2 generates an airflow flowing from top to bottom in the vertical direction in the winding chamber 1, and the film 6 is sucked into the winding chamber 1.

[0055] S2, the opening 11 is blocked, the film 6 continues to move in the winding chamber 1 along the vertical direction, the extrusion plate 3 moves toward the conveying unit 5, the volume of the winding chamber 1 is reduced, and at the same time, the pressing unit 4 arranged on the extrusion plate 3 presses the middle part of the film 6. If there is a curling phenomenon on the sides of the film 6, the airflow from top to bottom will blow the curled side walls back to their original position, thereby realizing automatic curling correction of the sides of the film 6.

[0056] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A blow molding machine, comprising a blowing unit, a winding unit, and a conveying unit for conveying a film blown by the blowing unit to the winding unit; It is characterized in that The winding unit includes a vertically arranged winding chamber, an opening is arranged at the upper part of the winding chamber, and the film enters the winding chamber through the opening. A first fan is arranged on the side walls on both sides of the winding chamber, and the first fan is used to extract the gas in the winding chamber. An extrusion plate is arranged on the side wall of the winding chamber to move in the horizontal direction. When the extrusion plate moves in the horizontal direction, the volume in the winding chamber can be changed. The first fans located on both sides of the winding chamber are arranged symmetrically about the extrusion plate. When the extrusion plate moves toward the conveying unit, the volume in the winding chamber decreases. When the extrusion plate moves in the direction away from the conveying unit, the volume in the winding chamber increases. A pressing unit is arranged on the side of the extrusion plate facing the winding chamber, and the pressing unit presses the middle part of the film entering the winding chamber. The horizontal distance between the extrusion plate and the side wall of the winding chamber is a, the thickness of the film is b, 2b<a<3b; A winding unit is arranged at the lower part of the winding chamber, and the winding unit includes a winding roller and a second fan. Winding holes are evenly opened on the winding roller, and the second fan is arranged at the end of the winding roller. The second fan draws external air into the winding roller from the outside to the inside through the winding holes. A moving unit is obliquely arranged at one end of the winding roller, and the moving unit is used to drive the winding roller to move along the oblique direction of the moving unit. The winding roller can be moved to the bottom of the winding chamber under the drive of the moving unit. A blocking unit is arranged at the bottom of the winding chamber, and the blocking unit comprises a blocking plate moving in the horizontal direction and a second linear drive arranged horizontally on one side of the blocking plate, and an output end of the second linear drive is fixedly connected to the blocking plate; A first rotating roller and a second rotating roller are respectively arranged to rotate in the vertical direction at the opening, the first rotating roller is located at the lower part of the second rotating roller, the upper part of the first rotating roller is used to receive the film, a plurality of vents are evenly opened in the middle part of the second rotating roller, the second rotating roller is arranged to move in the vertical direction at the upper part of the first rotating roller, when the second rotating roller is at the highest position, the opening is the largest, after the second rotating roller is lowered and contacts the film, the external airflow enters the winding chamber through the vents on the second rotating roller and is discharged; An adsorption unit is arranged on the side wall of the winding chamber away from the extrusion plate, and the adsorption unit includes an adsorption roller arranged in a vertical direction, a through hole is penetrated on the adsorption roller along the axial direction of the adsorption tube, a first adsorption hole is arranged on the side wall of the through hole, an adsorption belt is arranged on the outer periphery of all the adsorption rollers, a second adsorption hole is arranged on the adsorption belt, the first adsorption hole and the second adsorption hole can overlap when the adsorption roller and the adsorption belt are driven in coordination, the side of the adsorption belt facing the winding chamber is a vertical end face structure, and fans are respectively arranged at both ends of the through hole, one of the fans injects outside air into the through hole, and the other fan draws the air out of the through hole, and the air flow rate in the through hole is greater than the air flow rate in the winding chamber.

2. A blow molding machine according to claim 1, characterized in that: There are multiple first fans arranged on the side of the winding chamber in the vertical direction. After the end of the film enters the winding chamber, the first fans vertically arranged on the side of the winding chamber are started from top to bottom in sequence. When the end of the film drops to the bottom of the winding chamber, all the first fans are started.

3. A blow molding machine according to claim 1, characterized in that: The rotation speed of the suction belt is the same as the conveying speed of the conveying unit when conveying the film.

4. A blow molding machine according to claim 1, characterized in that: The pressing unit includes a pressing belt rotatably arranged on the extrusion plate, the pressing belt is located on the side of the extrusion plate facing the winding chamber, a translation plate is arranged on the side of the extrusion plate away from the pressing belt, the translation plate moves in the horizontal direction, and there is a gap between the extrusion plate and the translation plate, an extension rod is horizontally fixedly arranged on the side of the extrusion plate facing the translation plate, the extension rod penetrates the translation plate, a spring is arranged in the gap, the spring is sleeved on the periphery of the extension rod, and the two ends of the spring are respectively fixedly connected to the flat plate and the extrusion plate, when the pressing belt is not pressed against the film, the extrusion plate and the translation plate move synchronously and the gap between the extrusion plate and the translation plate remains unchanged, after the pressing belt contacts the film, the gap between the translation plate and the extrusion plate is reduced, and a first linear drive for driving the translation plate to move is horizontally arranged at one end of the translation plate away from the extrusion plate.

5. A method for forming an antibacterial polyurethane packaging film, using a blow molding machine as claimed in any one of claims 1 to 4, characterized in that: The specific steps are as follows: The conveying unit conveys the film from the blowing unit to the winding unit. At this time, the bottom of the winding chamber is in a sealed state. The first fan is started, and the first fan generates an airflow flowing from top to bottom in the winding chamber in a vertical direction, and the film is sucked into the winding chamber. The opening is blocked, and the film continues to move vertically in the winding chamber. The extrusion plate moves toward the conveying unit, and the volume of the winding chamber is reduced. At the same time, the pressing unit arranged on the extrusion plate presses the middle part of the film. If there is curling on the sides of the film, the airflow from top to bottom will blow the curled side walls straight and restore them to their original position, thereby realizing automatic curling correction of the side edges of the film.

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