CN114905728A - Preparation method of blown film on-line secondary stretching film - Google Patents
Preparation method of blown film on-line secondary stretching film Download PDFInfo
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- CN114905728A CN114905728A CN202210542697.XA CN202210542697A CN114905728A CN 114905728 A CN114905728 A CN 114905728A CN 202210542697 A CN202210542697 A CN 202210542697A CN 114905728 A CN114905728 A CN 114905728A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 160
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000009987 spinning Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 30
- 230000001681 protective effect Effects 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 16
- 238000003280 down draw process Methods 0.000 claims description 10
- 239000006260 foam Substances 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 10
- 238000011105 stabilization Methods 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000037303 wrinkles Effects 0.000 claims description 2
- 230000036314 physical performance Effects 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 8
- 239000010408 film Substances 0.000 description 163
- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
- 239000010409 thin film Substances 0.000 description 6
- 240000007643 Phytolacca americana Species 0.000 description 5
- 238000010096 film blowing Methods 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a preparation method of a blown film on-line secondary stretching film, wherein a production line comprises an extruder, a die, a wind ring, an upper spinning traction device, a heating stretching rotating device and a winding machine; the heating stretching and rotating device is arranged between the upper rotating traction device and the winding machine, the heating stretching and rotating device comprises a rotating shell, a plurality of heating rings arranged at the upper and lower intervals are arranged on the rotating shell, and the heating ring array comprises a plurality of heating pieces arranged on the inner wall of the rotating shell in a surrounding mode. This structure utilizes to rotate on the shell and generates heat a ring and encircle the film and rotate, realizes the even heating to the film, can improve the temperature with the thick department that the film appears, makes the film of this thick department receive relatively higher temperature and influences, has improved mobility, and film thickness before the realization rolling is even, makes the disk film after the rolling be the ring form, and the film after avoiding the rolling appears thick position more and more thick, and thin position is more and more thin.
Description
Technical Field
The invention relates to a film blowing machine, in particular to a preparation method of a blown film on-line secondary stretching film.
Background
After the film of the traditional film blowing machine comes out, if the thickness of the film is not uniform, the thick part of the film becomes thicker and thinner, and the thin part of the film becomes thinner and thinner, and is also tolerance like a piece of paper, and the film cannot be completely a plane. Therefore, if the film of the traditional film blowing machine is always thick and thin, the thick part is thicker and thinner during winding, and the coiled film is not round. Therefore, further improvement is desired.
Disclosure of Invention
The invention aims to provide a preparation method of a blown film on-line secondary stretching film, which can effectively realize uniform thickness of the extruded film before rolling, and enable the rolled disc-shaped film to be in a circular ring shape, thereby avoiding the rolled film from having thicker and thinner parts and overcoming the defects in the prior art.
The preparation method of the blown film on-line secondary stretching film designed according to the purpose comprises a control system for controlling the operation of the whole production line, an extruder for extruding the film, a die, an air ring for cooling the film, an upper spinning traction device for drawing the film and a winding machine for winding the film; the method is characterized in that: a heating stretching rotating device for heating the film is arranged between the upper rotating traction device and the winding machine; the heating stretching rotating device comprises a rotating shell, a plurality of heating rings are arranged on the rotating shell at intervals up and down, a heating ring array comprises a plurality of heating pieces arranged on the inner wall of the rotating shell at intervals in a surrounding mode, and an upper stretching traction device and a lower stretching traction device are arranged in the upper direction and the lower direction of the heating stretching rotating device respectively;
the preparation method comprises the following steps: a. after the extruder plasticizes the plastic particles, the plastic particles enter a die through a screen changer and an adapter, and film bubbles formed from the die are subjected to cold inflation in an air ring to form a film;
b. after bubble stabilization and thickness measurement, the film sequentially passes through the upper spinning traction device, the traction device and the deviation correcting device to enter the heating stretching rotating device, the heating ring rotates along with the rotating shell to uniformly heat the film, the temperature of the thick part of the film is increased, the film in the thick part is influenced by relatively high temperature, the fluidity is improved, and the uniform thickness of the film is realized; the heating ring circumferentially heats the film, and the vertical stretching traction devices in the vertical direction of the heating and stretching rotating device vertically draw and stretch the film up and down, the thickness of the film is changed through vertical stretching, and thickness measurement and foam stabilization are carried out on the film in the vertical stretching process;
c. and c, enabling the film after the step b is finished to enter a winding machine through a traction device and a deviation correcting device to be wound so as to form a cylindrical film roll.
The heating, stretching and rotating device also comprises a protective shell arranged at intervals with the rotating shell;
in the step b, the film passes through the inner cavity of the protective shell of the heating and stretching rotating device, the film and the heating element of the rotating shell are arranged at intervals through the protective shell, and if the film is broken or has a hole in the heating and stretching process of the film, the protective shell prevents the film from being hung on the heating element to damage the heating element; in addition, a plurality of vent holes are formed in the protective shell, a first gap is formed between the rotary shell and the protective shell, the film enters the protective shell through traction, a second gap is formed between the film and the protective shell, the first gap, the vent holes and the second gap are communicated in sequence, and the balance of the air pressure inside and outside the heating stretching rotating device is kept in the film heating stretching process.
The preparation method of the blown film on-line secondary stretching film further comprises a controller and temperature sensors, wherein a plurality of heating parts form a plurality of first heating areas in the longitudinal direction of the rotating shell, a plurality of heating parts form a plurality of second heating areas in the transverse direction of the rotating shell, a plurality of first heating areas form a plurality of same temperature detection areas in the vertical direction of the rotating shell, each heating part in one second heating area is provided with a temperature sensor in series connection, and the controller, the temperature sensors and the heating parts are electrically connected;
in the film heating and stretching process, the temperature sensor detects the temperature of the heating part and feeds back the detected temperature information to the main control board of the controller, the controller receives signals and controls the heating temperature of the heating part, and the heating temperature of each heating part is independently adjusted to ensure that different heating temperatures appear in the second heating area, the same heating temperature appears in the first heating area, and the thickness of the film is further uniform.
The temperature of each heating element is adjusted to 50-100 ℃.
A first bubble stabilizing frame and a first thickness gauge are arranged between the wind ring and the upper rotating traction device;
in the step b, the thin film enters a first thickness gauge after being subjected to bubble stabilization through a first bubble stabilization frame, the first thickness gauge detects and reads thickness parameters of the thin film, the first thickness gauge transmits the information to a control system, and the control system adjusts the temperature of a valve and a heating rod in an air ring according to the information so as to improve the thickness distribution of the thin film.
A first traction device, a first deviation correcting device, a first up-down stretching traction device, a second foam stabilizing frame and a first deviation correcting device are arranged between the upper rotary traction device and the heating stretching rotary device; a second thickness gauge, a third foam stabilizing frame, a second up-down stretching traction device, a second deviation correcting device and a second traction device are arranged between the heating, stretching and rotating device and the winding machine; the first up-down stretching traction device and the second up-down stretching traction device are respectively positioned on the upper side and the lower side of the heating and stretching rotating device so as to carry out up-down stretching on the film;
in the step b, after the film is subjected to bubble stabilization and thickness measurement, the film sequentially passes through an upper rotating traction device to flatten wrinkles on the film, and then sequentially passes through a first traction device, a first deviation correcting device, a first upper and lower stretching traction device and a second bubble stabilization frame to enter a heating and stretching rotating device, wherein the film discharged from the first upper and lower stretching traction device is inflated by a fan, and then enters the heating and stretching rotating device after the bubble is stabilized by the second bubble stabilization frame, and the edge of the film is aligned by the first deviation correcting device;
in addition, in the film heating and stretching process, before the film enters the second up-down stretching traction device, the third bubble stabilizing frame is used for stabilizing bubbles of the film, and then the thickness parameter of the film is detected through the second thickness gauge.
The first up-down stretching traction device and the second up-down stretching traction device respectively comprise a traction roller set or a traction wheel set and a servo motor for driving the traction roller set or the traction wheel set to move up and down through a lifting mechanism; the servo motor drives the traction roller set or the traction roller set to move up and down, so that the stretching speed and the multiplying power of the film are accurately and finely adjusted to make up for the pressure loss caused by the fact that gas in the film is taken away; and the second up-down drawing traction device and the first up-down drawing traction device have different drawing speeds, if the drawing speed of the second up-down drawing traction device is N times of that of the first up-down drawing traction device, the film is drawn by N times, the width of the film is unchanged, the thickness of the film is 1/N before drawing, the physical properties of the film after drawing are improved greatly, such as puncture resistance, drawing performance and the like.
The first thickness gauge and the second thickness gauge comprise fixed rings and movable plates arranged on the fixed rings in a sliding mode, supports are arranged on the movable plates, and thickness measuring sensors are arranged on the supports; the outer wall of the fixing ring is provided with a synchronous belt, the movable plate is provided with a tension pulley and a driving wheel corresponding to the synchronous belt, the tension pulley and the driving wheel are sequentially in transmission connection, and the driving wheel is driven to rotate by a motor so that the movable plate slides along the fixing ring;
in the process of detecting the thickness parameter of the film, the film penetrates through the fixing ring, the thickness measuring sensor slides along the fixing ring along with the movable plate, the thickness measuring sensor surrounds the film for detection, the thickness parameter information of the film is fed back to the control system, and after the control system receives the information, the control system sends an instruction to adjust the temperature of a valve and a heating rod in the air ring according to the information transmitted by the first thickness gauge; the control system sends out an instruction according to the information transmitted by the second thickness gauge to control the traction speed of the second up-down stretching traction device and the first up-down stretching traction device; or the second thickness gauge feeds back the thickness parameter information of the film to the controller, and the controller adjusts the heating temperature of the heating part according to the information.
When the thin film is in traction movement, the thickness measuring sensors of the first thickness gauge and the second thickness gauge also move around the thin film, so that the thickness parameters of the thin film can be detected.
And c, the film after the step b is finished enters a winding machine through a second deviation correcting device and a second traction device.
The temperature of the screw of the extruder is 170-250 ℃, and the rotating speed of the screw of the extruder is 30-100 revolutions per minute.
The invention has the following beneficial technical effects:
the film is encircled to the piece that generates heat on utilizing to rotate the shell and rotates, realizes the even heating to the film, can be with the thick department raising the temperature that the film appears, makes the film of this thick department receive relatively higher temperature influence, has improved mobility, and the film thickness before the realization rolling is even, makes the disk film after the rolling be the ring form, and the film after avoiding the rolling appears thick position more and more thick, and thin position is more and more thin.
The physical properties of the film are improved by stretching the film up and down.
Drawings
Fig. 1 is a schematic plane structure diagram of a method for preparing a blown film on-line secondary stretched film according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a heating, stretching and rotating apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic plan view of a heating, stretching and rotating apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of a first thickness gauge or a second thickness gauge according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of another orientation of the first thickness gauge or the second thickness gauge according to an embodiment of the present invention.
Fig. 6 is a schematic perspective sectional view of a portion of the first thickness gauge or the second thickness gauge according to an embodiment of the present invention.
Fig. 7 is a schematic partial perspective view of a first thickness gauge or a second thickness gauge according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of a top spin traction apparatus according to an embodiment of the present invention.
Fig. 9 is a perspective view of another embodiment of the upper spin traction device of the present invention.
FIG. 10 is a schematic diagram of a plurality of sensors forming a heating zone on a rotating housing according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1-3, a method for preparing a blown film on-line secondary stretched film, the on-line blown film stretching production line includes an extruder 2 for extruding a film 1, a die 3, an air ring 4 for cooling the film 1, an upper rotating traction device 5 for drawing the film, and a winder 6 for winding the film; a heating stretching rotating device 7 for heating the film 1 is arranged between the upper rotating traction device 5 and the winding machine 6; the heating stretching rotating device 7 comprises a rotating shell 8, a plurality of heating rings which are arranged on the rotating shell 8 at intervals are arranged on the rotating shell, and a heating ring array comprises a plurality of heating pieces 9 which are arranged on the inner wall of the rotating shell 8 in an encircling mode at intervals.
In this embodiment, each heat generating ring is provided with 50 heat generating members 9, the 50 heat generating members 9 divide the circumference of the film 1 into 50 zones, and the interval between every two heat generating members 9 is the same. The reason why the heating and stretching rotating means 7 sets the rotating case 8 to rotate is as follows: after the film 1 of the traditional film blowing machine comes out, if the thickness of the film 1 is not uniform, the thick part of the film 1 becomes thicker and thinner, and the thin part of the film 1 becomes thinner and thinner, and is also tolerance like a piece of paper, and the film cannot be completely a plane. Therefore, if the film 1 of the conventional film blowing machine is always thick and thin, the thick part is thicker and thinner during winding, and the wound disc-shaped film is not like a circle. Therefore, in this embodiment, after the film 1 is extruded by the extruder 2 and the die 3, the film 1 enters the heating and stretching rotating device 7 through the upper rotating traction device 5, after the film 1 enters the heating and stretching rotating device 7, the rotating shell 8 rotates relative to the film 1, and the heating ring rotates along with the rotating shell 8 to uniformly heat the film 1, so that the temperature of the thick portion of the film 1 can be increased, the film 1 at the thick portion is affected by relatively high temperature, the flowability is increased, and the thickness uniformity of the film 1 is realized.
The heating and stretching rotating device 7 further comprises a protective shell 10 provided with a plurality of ventilation holes 11, a first gap 12 is arranged between the rotary shell 8 and the protective shell 10, the film 1 enters the protective shell 10 through traction, a second gap 13 is arranged between the protective shell and the film 1, and the first gap 12, the ventilation holes 11 and the second gap 13 are communicated in sequence to keep the balance of wind pressure inside and outside the heating and stretching rotating device 7.
Referring to fig. 2 and 3, in the present embodiment, on one hand, a protective shell 10 having a plurality of ventilation holes 11 is spaced from the rotating housing 8, and the film 1 enters the protective shell 10, and the film 1 is also spaced from the protective shell 10, so that hot air can flow among the first gap 12, the ventilation holes 11, and the second gap 13, and the balance of wind pressure inside and outside the heating and stretching rotating device 7 is maintained; on the other hand, the protective shell 10 plays a role of protecting the heating element, and prevents the heating element from being damaged when the film is broken or a hole is formed.
The preparation method of the blown film on-line secondary stretching film further comprises a controller and a temperature sensor, wherein a plurality of heating parts 9 form a plurality of first heating areas A in the longitudinal direction of the rotating shell 8, a plurality of heating parts 9 form a plurality of second heating areas B in the transverse direction of the rotating shell 8, a plurality of first heating areas A form a plurality of same temperature detection areas in the vertical direction of the rotating shell 8, each heating part 9 in one second heating area B is provided with a temperature sensor in series connection, the controller, the temperature sensor and the heating parts 9 are electrically controlled to be connected, the temperature sensor detects the temperature of the heating parts 9 and feeds back the detected temperature information to a main control board of the controller, and the controller receives signals and controls the heating temperature of the heating parts 9.
In this embodiment, each heating ring is provided with 50 heating members 9, the 50 heating members 9 divide the circumference of the film 1 into 50 longitudinal and transverse heating zones, the second heating zones B can adjust different temperatures, and the vertical direction of the rotating housing 8 of the first heating zones form the same temperature detection area (equivalent to the longitudinal direction of the rotating housing 8, the temperature of each first heating zone a is the same).
The heating element 9 is an infrared heater, the heating element 9 comprises a shell, and a temperature sensor is arranged in the shell of the heating element in series connection.
In this embodiment, the infrared heater may employ an existing buried far infrared radiation ceramic heating plate.
The top or the bottom of the rotating shell 8 is provided with a rotating gear 14, the outer side of the rotating gear 14 is provided with a motor for driving the rotating gear 14 to rotate, and the rotating gear 14 is provided with a cavity avoiding cavity corresponding to the cavities of the rotating shell 8 and the protective shell 10. In this embodiment, the drive wheel on the motor engages with the rotary gear 14.
Specifically, the method comprises the following steps: in the heating and stretching process of the film 1, the motor controls the rotating speed of the gear 14, and the adjustment is carried out according to the measured thickness parameter of the film 1, so that the film 1 is heated uniformly, and the thickness of the film 1 is more uniform.
Referring to fig. 1, a first foam stabilizing frame 15 and a first thickness gauge 16 are arranged between the wind ring 4 and the upper rotating traction device 5; a first traction device 17, a first deviation correcting device 18, a first up-down stretching traction device 19, a second foam stabilizing frame 20 and a first deviation correcting device 18 are arranged between the upper rotating traction device 5 and the heating stretching rotating device 7; a second thickness gauge 21, a third foam stabilizing frame 22, a second up-down stretching traction device 23, a second deviation correcting device 24 and a second traction device 25 are arranged between the heating, stretching and rotating device 7 and the winding machine 6;
the film thickness measuring device comprises a wind ring 4, a first bubble stabilizing frame 15, a first thickness gauge 16, an upper rotating traction device 5, a first traction device 17, a first deviation correcting device 18, a first upper and lower stretching traction device 19, a second bubble stabilizing frame 20, a heating and stretching rotating device 7, a second thickness gauge 21, a third bubble stabilizing frame 22, a second upper and lower stretching traction device 23, a second deviation correcting device 24, a second traction device 25 and a winding machine 6, wherein the wind ring, the first bubble stabilizing frame 15, the first thickness gauge 16, the upper rotating traction device 5, the first traction device 17, the first deviation correcting device 18, the first upper and lower stretching traction device 19, the second bubble stabilizing frame 20, the heating and stretching rotating device 7, the second thickness gauge 21, the third bubble stabilizing frame 22, the second upper and lower stretching traction device 23, the second deviation correcting device 24, the second traction device 25 and the winding machine 6 are sequentially connected with each other in the process; wherein, the first up-down drawing device 19 and the second up-down drawing device 23 are respectively positioned on the upper side and the lower side of the heating and drawing rotating device 7 so as to draw and draw the film 1 up and down.
In this embodiment, the first bubble stabilizing frame 15, the second bubble stabilizing frame 20, and the third bubble stabilizing frame 22 each include an annular frame, a plurality of sets of roller frames rotatably connected to the annular frame and arranged in an annular shape, a synchronous connecting rod hinged to the plurality of sets of roller frames, and a regulating motor for driving the plurality of sets of roller frames to synchronously swing, wherein the regulating motor is coaxially connected to a rotating shaft of one set of roller frames, and the regulating motor can drive the roller frames to synchronously swing so as to regulate the surrounding diameters of the roller frames to adapt to films of different sizes.
In this embodiment, each of the first deviation rectifying device 18 and the second deviation rectifying device 24 includes a fixed frame, a movable frame, and a deviation rectifying cylinder for driving the movable frame to move horizontally toward the left and right sides relative to the fixed frame, the fixed frame and the movable frame are respectively connected to the deviation rectifying cylinder in a matching manner, and a rotating guide roller is disposed on the movable frame. The film tape can be corrected by using the correction device, particularly, the film tape bypasses the guide roller on the movable frame and is drawn under the guide of the guide roller, and when the film tape deviates, the correction cylinder can push the movable frame to move left and right to adjust the position of the film tape so as to realize correction.
In this embodiment, each traction device includes a rotating set of traction rollers, or traction wheels.
In this embodiment, the rolling machine is including supporting, the deflector roll, the compression roller, be used for taking compression roller pivoted compression roller driving motor, the wind-up roll, a first wind-up roll bracket for bearing the wind-up roll, second wind-up roll bracket, deflector roll and compression roller all rotate with the coiling mechanism support frame and be connected, first wind-up roll bracket and second wind-up roll bracket set up in the compression roller homonymy and both all with the pin joint of coiling mechanism support frame, and first wind-up roll bracket and second wind-up roll bracket still dispose respectively and are used for driving its wobbling first wind-up roll bracket swing cylinder and second wind-up roll bracket swing cylinder. The first wind-up roll bracket and the second wind-up roll bracket can both support wind-up rolls, the wind-up rolls on the first wind-up roll bracket can be matched with the compression roller to compress a winding drum under the drive of the first wind-up roll bracket swing cylinder, meanwhile, the compression roller is driven by the compression roller driving motor to rotate to enable the wind-up rolls to rotate and wind along with the compression roller, when the wind-up rolls need to be changed, the first wind-up roll bracket swing cylinder and the second wind-up roll bracket swing cylinder can drive the wind-up rolls to oppositely swing, the wind-up rolls can be transferred to the second wind-up roll bracket from the first wind-up roll bracket after the second wind-up roll bracket resets, the wind-up rolls can be detached after the second wind-up roll bracket resets, the wind-up rolls are installed on the first wind-up roll bracket, and the fast wind-up roll change is realized through the mode.
Referring to fig. 1, the first up-down stretching traction device 19 and the second up-down stretching traction device 23 each include a traction roller set or a traction wheel set, and a servo motor for driving the traction roller set or the traction wheel set to move up and down through a lifting mechanism. The servo motor drives the traction roller set or the traction roller set to move up and down, so that the stretching speed and the magnification of the film 1 can be accurately and finely adjusted to make up for the pressure loss caused by the fact that the gas in the film 1 is taken away.
In this embodiment, the lifting mechanism comprises a lifting chain, a screw rod or a lifting rack, and is matched with the drawer slide rail structure to realize stable lifting.
Referring to fig. 4-7, each of the first thickness gauge 16 and the second thickness gauge 21 includes a fixed ring 26 and a movable plate 27 slidably disposed on the fixed ring 26, the movable plate 27 is provided with a bracket 28, and the bracket 28 is provided with a thickness measuring sensor 29; the outer wall of the fixed ring 26 is provided with a synchronous belt 30, the movable plate 27 is provided with a tension pulley 31 and a transmission wheel 32 corresponding to the synchronous belt 30, the tension pulley 31 and the transmission wheel 32 are sequentially in transmission connection, and the transmission wheel 32 is driven to rotate by a motor, so that the movable plate 27 slides along the fixed ring 26.
In this example, the thickness of the film 1 was measured by the first thickness gauge 16 after the extrusion of the film 1, and the thickness of the film 1 was measured by the second thickness gauge 21 after the completion of the step of heating the stretching rotary device 7.
A drag chain 33 is further arranged between the movable plate 27 and the fixed ring 26, a swing poke rod 34 is arranged on the movable plate 27 corresponding to the drag chain 33, the poke rod 34 is rotatably arranged on the drag chain 33, a first travel switch 35 and a second travel switch 36 are respectively arranged at two ends of the movable plate 27 corresponding to the swing track of the poke rod 34, the poke rod 34 follows the spring sheet of the first travel switch 35 or the second travel switch 36 when the plate 27 slides in the fixed ring 26, and the poke rod 34 contacts with the spring sheet of the first travel switch 35 or the second travel switch 36 under the swing. The position of the movable plate 27 on the fixed ring 26 can be sensed by the control system through a travel switch.
Referring to fig. 8 and 9, the upper spin traction device 5 includes a fixed frame 37, a fixed disk 38 disposed on the fixed frame 37 through a support, a rotating disk 39 rotatably disposed on the fixed disk 38, a guiding frame 40 installed below the fixed disk 38, and an upper traction assembly 41 fixedly installed on the rotating disk 39 and connected to the guiding frame 40 in a stroke process; the upper traction assembly 41 comprises an upper driving traction roller 42, an upper driven traction roller 43 and a motor for driving the upper driving traction roller 42 to rotate; the fixed frame 37 is provided with an adjusting cylinder 44 around the guide frame 40, a piston rod of the adjusting cylinder 44 is connected with one side of the guide frame 40 in a matching way, and the internal volume space of the guide frame 40 is adjusted through the adjusting cylinder 44. The guide frame 40 and the adjustment cylinder 44 are conventional and are well known to those skilled in the art, and will not be described in detail herein.
After the film 1 passes through the inverted guide frame 40, the film 1 is compressed and folded into a belt shape under the guide of the guide frame 40, the upper traction assembly 41 can be driven to rotate by a rotation driving mechanism (which can be understood as a rotating disc 30 and a motor for driving the rotating disc 30, a tooth groove can be arranged on the periphery of the rotating disc 30, and the tooth groove is meshed with a motor driving wheel), so that the film 1 is pulled at different angles, the film 1 is uniformly pulled, and the transparency is improved.
The specific work flow is as follows:
the film 1 is extruded by the extruder 2-the die 3-to form the film 1, the film 1 passes through the air ring 4, the first bubble stabilizing frame 15 and the first thickness gauge 16 (thickness gauge), and the film 1 sequentially enters the second bubble stabilizing frame 20, the heating and stretching rotating device 7, the second thickness gauge 21, the third bubble stabilizing frame 22, the second upward and downward stretching pulling device 23, the second deviation correcting device 24 and the second pulling device 25 to be wound by the winding machine 6 through the upward rotating pulling device 5, the first pulling device 17, the first deviation correcting device 18 and the first upward and downward stretching pulling device 19 after the thickness gauge is measured. (the above process is understood to be film extrusion, drawing, winding).
When the film 1 enters the heating and stretching rotating device 7, the heating and stretching rotating device 7 rotates and heats the film 1, the first vertical stretching traction device 19 and the second vertical stretching traction device 23 simultaneously draw and stretch the film up and down, and the film 1 is driven by the servo motor to draw and stretch up and down, so that the stretching speed and the magnification of the film 1 can be accurately and finely adjusted to make up for the pressure loss caused by the fact that the gas in the film 1 is taken away.
Plastic particles are sucked to a feeding system from a material suction machine in the feeding system and then enter an extruder, the temperature of a screw of the extruder 2 is about 170-250 ℃, the rotating speed is about 30-100 revolutions per minute, the plastic particles are plasticized, the plastic particles enter a die 3 through a screen changer and an adapter, a bubble formed from the die 3 enters a first bubble stabilizing frame 15 to stabilize the bubble through cold blowing in an air ring 4, then enters a first thickness gauge 16, the thickness parameter of the film 1 is read by the first thickness gauge 16, a control system improves the thickness distribution of the film 1 through adjusting the temperature of a valve and a heating rod in the air ring 4 according to the measured thickness parameter, then the film 1 enters a guide frame 40 and reaches an upper traction assembly 41 of an upper rotation traction device 5 through the guide frame 40, the upper traction assembly 41 horizontally rotates and flattens folds on the film 1 to horizontally rotate, and then passes through a first traction device 17, The first deviation correcting device 18, the first deviation correcting device 18 aligns the edges of the film 1, the film 1 then passes through the first up-down stretching traction device 19, the film 1 discharged from the first up-down stretching traction device 19 is inflated by a fan, the film 1 passes through the second bubble stabilizing frame 20 to stabilize the bubble, the film 1 enters the heating and stretching rotating device 7, the temperature of the heating and stretching rotating device 7 is about 50-100 ℃, the heating and stretching rotating device 7 heats the film 1, a second up-down stretching traction device 23 is arranged below the heating and stretching rotating device 7, the stretching traction speed of the second up-down stretching traction device 23 is different from that of the first up-down stretching traction device 19, the speed of the second up-down stretching traction device 23 is multiple of that of the first up-down stretching traction device 19, if 2 times, the film 1 is stretched by 2 times, and the width of the film is unchanged, the thickness of the film was 1/2 before stretching. When the speed was 3 times, the thickness of the film 1 was 1/3 before stretching, and so on. The physical properties of the stretched film 1, such as puncture strength and tensile properties, are greatly improved. After the film 1 passes through the second up-down stretching traction device 23 and the film 1 is subjected to deviation correction by the second deviation correcting device 24, the film 1 is guided by the second traction device 25 to be divided into two pieces, and the two pieces of films 1 are respectively wound on two winding machines.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A preparation method of a blown film on-line secondary stretching film comprises a control system for controlling the operation of the whole production line, an extruder (2) for extruding a film (1), a die (3), an air ring (4) for cooling the film (1), an upper rotating traction device (5) for drawing the film and a winding machine (6) for winding the film; the method is characterized in that: a heating stretching rotating device (7) for heating the film (1) is arranged between the upper spinning traction device (5) and the winding machine (6); the heating and stretching rotating device (7) comprises a rotating shell (8), a plurality of heating rings which are arranged at intervals up and down are arranged on the rotating shell (8), a heating ring array comprises a plurality of heating pieces (9) which are arranged on the inner wall of the rotating shell (8) in a surrounding mode at intervals, and an upper stretching and a lower stretching traction device are respectively arranged in the upper direction and the lower direction of the heating and stretching rotating device (7);
the preparation method comprises the following steps: a. plasticizing plastic particles by an extruder (2), feeding the plastic particles into a die (3) through a screen changer and an adapter, and carrying out cold inflation on film bubbles formed from the die (3) in an air ring (4) to form a film (1);
b. the film (1) passes through a bubble stabilizing and thickness measuring device and then sequentially enters a heating, stretching and rotating device (7) through a top spinning traction device (5), a traction device and a deviation correcting device, a heating ring rotates along with a rotating shell (8) to uniformly heat the film (1), the temperature of the thick part of the film (1) is increased, the film (1) at the thick part is influenced by relatively high temperature, the flowability is improved, and the uniform thickness of the film (1) is realized; the heating ring circumferentially heats the film (1), and the film (1) is vertically drawn and stretched by a vertical drawing device in the vertical direction of the heating and stretching rotating device (7), the thickness of the film (1) is changed by vertical drawing, and the thickness measurement and foam stabilization are carried out on the film (1) in the vertical drawing and stretching process;
c. and c, the film (1) after the step b is finished enters a winding machine (6) through a traction device and a deviation correcting device to be wound so as to form a cylindrical film roll.
2. The method for preparing the blown film on-line secondary stretched film according to claim 1, characterized in that: the heating, stretching and rotating device (7) also comprises a protective shell (10) which is arranged at intervals with the rotating shell (8);
in the step b, the film (1) penetrates through the inner cavity of a protective shell (10) of the heating and stretching rotating device (7), the film (1) and a heating part (9) of the rotating shell (8) are arranged at intervals through the protective shell (10), if the film (1) is broken or has a hole in the heating and stretching process of the film (1), the protective shell (10) prevents the film (1) from being hung on the heating part (9) to damage the heating part (9); in addition, a plurality of vent holes (11) are formed in the protective shell (10), a first gap (12) is formed between the rotary shell (8) and the protective shell (10), the film (1) enters the protective shell (8) through traction, a second gap (13) is formed between the rotary shell and the protective shell, the first gap (12), the vent holes (11) and the second gap (13) are communicated in sequence, and the balance of the air pressure inside and outside the heating and stretching rotating device (7) is kept in the heating and stretching process of the film (1).
3. The method for preparing a blown film on-line secondary stretched film according to claim 1, characterized in that: the heating device is characterized by further comprising a controller and temperature sensors, wherein a plurality of first heating zones (A) are formed on the plurality of heating parts (9) in the longitudinal direction of the rotating shell (8), a plurality of second heating zones (B) are formed on the plurality of heating parts (9) in the transverse direction of the rotating shell (8), a plurality of same temperature detection zones are formed on the plurality of first heating zones (A) in the vertical direction of the rotating shell (8), each heating part (9) in one second heating zone (B) is internally provided with a temperature sensor in series, and the controller, the temperature sensors and the heating parts (9) are electrically controlled and connected;
in the heating and stretching process of the film (1), the temperature sensor detects the temperature of the heating piece (9) and feeds detected temperature information back to a main control board of the controller, the controller receives signals and controls the heating temperature of the heating piece (9), and the heating temperature of each heating piece (9) is independently adjusted, so that different heating temperatures appear in the second heating area (B), and the same heating temperature appears in the first heating area (A).
4. The method for preparing the blown film on-line secondary stretched film according to claim 3, characterized in that: the temperature of each heating element (9) is adjusted to 50-100 ℃.
5. The method for preparing the blown film on-line secondary stretched film according to claim 3, characterized in that: a first foam stabilizing frame (15) and a first thickness gauge (16) are arranged between the wind ring (4) and the upper rotating traction device (5);
in the step b, the film (1) is subjected to bubble stabilization through the first bubble stabilizing frame (15) and enters the first thickness gauge (16), the first thickness gauge (16) detects and reads thickness parameters of the film (1), the first thickness gauge (16) transmits the information to the control system, and the control system adjusts the temperature of a valve and a heating rod in the air ring (4) according to the information so as to improve the thickness distribution of the film (1).
6. The method for preparing the blown film on-line secondary stretched film according to claim 5, characterized in that: a first traction device (17), a first deviation correcting device (18), a first up-down stretching traction device (19), a second foam stabilizing frame (20) and a first deviation correcting device (18) are arranged between the upper rotary traction device (5) and the heating stretching rotary device (7); a second thickness gauge (21), a third foam stabilizing frame (22), a second up-down stretching traction device (23), a second deviation correcting device (24) and a second traction device (25) are arranged between the heating stretching rotating device (7) and the winding machine (6); the first up-down stretching traction device (19) and the second up-down stretching traction device (23) are respectively positioned on the upper side and the lower side of the heating and stretching rotating device (7) to carry out up-down stretching on the film (1);
in the step b, after the film (1) is subjected to bubble stabilization and thickness measurement and then sequentially passes through the upper rotating traction device (5) to flatten wrinkles on the film (1), the film (1) sequentially passes through the first traction device (17), the first deviation correcting device (18), the first upper and lower stretching traction device (19) and the second bubble stabilizing frame (20) and enters the heating and stretching rotating device (7), the film (1) discharged from the first upper and lower stretching traction device (19) is inflated through a fan, the film bubbles are stabilized through the second bubble stabilizing frame (20) and then enter the heating and stretching rotating device (7), and the first deviation correcting device (18) aligns the edges of the film (1);
in addition, in the heating and stretching process of the film (1), before the film (1) enters the second up-down stretching traction device (23), the third bubble stabilizing frame (22) is used for stabilizing bubbles of the film (1), and then the second thickness gauge (21) is used for detecting thickness parameters of the film (1).
7. The method for preparing the blown film on-line secondary stretched film according to claim 6, characterized in that: the first up-down stretching traction device (19) and the second up-down stretching traction device (23) respectively comprise a traction roller set or a traction wheel set and a servo motor for driving the traction roller set or the traction wheel set to move up and down through a lifting mechanism; the servo motor drives the traction roller set or the traction roller set to move up and down, so that the stretching speed and the multiplying power of the film (1) are accurately and finely adjusted to make up for the pressure loss caused by the fact that air in the film (1) is taken away; and the second up-down drawing traction device (23) and the first up-down drawing traction device (19) have different drawing speeds, if the drawing speed of the second up-down drawing traction device (23) is N times of the drawing speed of the first up-down drawing traction device (19), the film (1) is drawn by N times, the width of the film (1) is not changed, the thickness of the film (1) is 1/N before drawing, and the physical performance of the film (1) is improved through drawing.
8. The method for preparing a blown film on-line secondary stretched film according to claim 7, characterized in that: the first thickness gauge (16) and the second thickness gauge (21) respectively comprise a fixed ring (26) and a movable plate (27) which is arranged on the fixed ring (26) in a sliding manner, a support (28) is arranged on the movable plate (27), and a thickness measuring sensor (29) is arranged on the support (28); a synchronous belt (30) is arranged on the outer wall of the fixed ring (26), a tension pulley (31) and a driving wheel (32) are arranged on the movable plate (27) corresponding to the synchronous belt (30), the tension pulley (31) and the driving wheel (32) are sequentially in transmission connection, and the driving wheel (32) is driven to rotate through a motor so that the movable plate (27) slides along the fixed ring (26);
in the process of detecting the thickness parameters of the film (1), the film (1) penetrates through a fixing ring (26), a thickness measuring sensor (29) slides along the fixing ring (26) along with a movable plate (27), the thickness measuring sensor (29) surrounds the film (1) for detection, the thickness parameter information of the film (1) is fed back to a control system, and after the control system receives the information, the control system sends out an instruction to adjust the temperature of a valve and a heating rod in an air ring (4) according to the information transmitted by a first thickness measuring instrument (16); the control system sends out an instruction according to the information transmitted by the second thickness gauge (21) to control the traction speed of the second up-down stretching traction device (23) and the first up-down stretching traction device (19); or the second thickness gauge (21) feeds back the thickness parameter information of the film (1) to the controller, and the controller adjusts the heating temperature of the heating member (9) according to the information.
9. The method for preparing a blown film on-line secondary stretched film according to claim 7, characterized in that: and c, enabling the film (1) after the step b is finished to enter a winding machine (6) through a second deviation correcting device (24) and a second traction device (25).
10. The method for preparing a blown film on-line secondary stretched film according to claim 1, characterized in that: the temperature of the screw of the extruder (2) is 170-250 ℃, and the rotating speed of the screw of the extruder (2) is 30-100 r/min.
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| CN202210542697.XA CN114905728B (en) | 2022-05-18 | 2022-05-18 | Preparation method of online secondary stretch film by film blowing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118404802A (en) * | 2024-07-01 | 2024-07-30 | 山东玖旺新材料科技有限公司 | Stretching device for high polymer film production |
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| CN114905728B (en) | 2024-08-09 |
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