CN108016027B - A kind of control method of BOPP bidirectional stretching system - Google Patents
A kind of control method of BOPP bidirectional stretching system Download PDFInfo
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- CN108016027B CN108016027B CN201810058678.3A CN201810058678A CN108016027B CN 108016027 B CN108016027 B CN 108016027B CN 201810058678 A CN201810058678 A CN 201810058678A CN 108016027 B CN108016027 B CN 108016027B
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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
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
Abstract
The present invention provides a kind of control methods of BOPP bidirectional stretching system, for three motors subsystem arbitrary in system stretch section: including preposition axis, the first jockey pulley, main drive axis, the second jockey pulley, postposition axis, it is controlled using two distributed directors, wherein, preposition spindle motor and main drive spindle motor are controlled by the first controller, and main drive spindle motor and postposition spindle motor are controlled by second controller, meanwhile first controller and second controller are exported by the shared a part of superposing control factor a and b to control the main drive spindle motor.Two continuous controllers are shared a part by the superposing control factor and are output and input in method of the invention, the decoupling ability of system speed and tension can be significantly improved, and the above subsystem is extended in more motor reel systems of biaxial orientation process accordingly, film vertical and horizontal thickness control model has also been devised simultaneously, to realize that the speed of drawing process, tension, thickness synchronize accurate control.
Description
Technical field
The present invention relates to control technology fields, and in particular to a kind of control method of BOPP bidirectional stretching system.
Background technique
BOPP is the abbreviation of " Biaxially Oriented Polypropylene ", BOPP film, that is, biaxial stretching polypropylene
Alkene film.The production of BOPP film is the melt of macromolecule polypropylene to be passed through long and narrow head first sheet material or thick film is made, so
Afterwards in dedicated stretching-machine, at certain temperature and the speed of setting, and meanwhile or it is (vertical in vertical both direction step by step
To, laterally) on the stretching that carries out, and be made by cooling appropriate or heat treatment or special processing (such as corona, coating)
Film.
It is wound in transmission and tensioning system in BOPP film, the main target that controls is the disturbance in coil diameter and set point change
In the case of, the speed and tension of each live-roller of independent control.However, these disturbance factors and control amount often interact and
It can not individually be described.It include a series of execution in the vertical drawing of the slab-of whole system-horizontal drawing-traction-winding production process
Mechanism (driving motor), and realize that the control of more motors is difficult to realize using a global multivariable controller.
Summary of the invention
Present invention solves the technical problem that being to provide a kind of control method of BOPP bidirectional stretching system, to reduce film
Longitudinal thickness deviation.
To solve the above-mentioned problems, present invention employs following technical solutions:
A kind of control method of BOPP bidirectional stretching system, for three motors subsystem arbitrary in system stretch section: packet
Preposition axis, the first jockey pulley, main drive axis, the second jockey pulley, postposition axis are included, is controlled using two distributed directors,
In, preposition spindle motor and main drive spindle motor are controlled by the first controller, and by second controller control main drive spindle motor with
Postposition spindle motor, meanwhile, first controller and second controller pass through the shared a part output of superposing control factor a and b
To control the main drive spindle motor.
Further, first controller is with membrane tension setting value T at preposition axisu_refWith film speed at main drive axis
Setting value VrefTo input, and according to the real-time strain T of film at the first jockey pulleyuWith it is main drive axis at film real-time speed V,
Obtain preposition spindle motor tension force deviation xu=Tu_ref-TuWith speed control deviation xv=Vref- V, and then according to as follows
Formula obtains preposition shaft torque control signal uuWith main drive spindle motor torque control signal uv1:
Wherein, Pu、Pv1For proportional gain factor, Tiu、Tiv1For integration time constant, iu、ivFor preposition spindle motor and main drive
The register ratio of spindle motor, nu、nvFor preposition spindle motor and the main motor speed for driving spindle motor；
The second controller is with film speed setting value V at main drive axisrefWith membrane tension setting value T at postposition axisw_ref
To input, and according to the real-time strain T of film at the real-time speed V and the second jockey pulley of film at main drive axisw, obtain postposition axis
Motor tension force deviation xw=Tw_ref-TwWith speed control deviation xv=Vref- V, and then led according to the following formula
Drive spindle motor torque control signal uv2With postposition spindle motor torque control signal uw:
Wherein, Pw、Pv2For proportional gain factor, Tiw、Tiv2For integration time constant, iw、ivFor postposition spindle motor and main drive
The register ratio of spindle motor, nw、nvFor postposition spindle motor and the main motor speed for driving spindle motor；
Later, main drive spindle motor is obtained according to the Overlapped control factor a and b and controls signal uv=auv1+b·uv2。
Further, at first jockey pulley film real-time strainT1For preposition axis and the first tension
The tension of film, T between roller2For the first jockey pulley and the main tension T for driving film between axisu；Film at second jockey pulley
Real-time strainT3Based on drive the tension of film between axis and the second jockey pulley, T4For the second jockey pulley and postposition axis
Between film tension；T1、T2、T3、T4It is obtained with the real-time speed V of film at main drive axis by following formula:
Wherein, Ωk=Vk/RkFor the revolving speed of kth roller, KkFor motor torque constant, UkFor motor torque, JkIt is used to rotate
Amount, RkFor coil diameter, CfFor friction torque, V0For the specified film speed of film at preposition axial outlet, TkAnd LkFor -1 roller of kth and kth
Tension and film between roller is long, V0For film ideal velocity, T0For film desired tension, E is the Young springform of thin-film material
Amount, S are film sections product；The main real-time speed V=V for driving film at axis3。
Further, the slab of the BOPP bidirectional stretching system, vertical drawing, horizontal drawing, traction and five parts of winding include M1-
M12 totally 12 axis driving motors, wherein motor M1 drives chilling roller, and motor M2, M3, M4 drive three stretchings in longitudinal stretching area
Roller, motor M5 drive cross directional stretch area draw roll, and M6, M7, M8, M9 and M10 drive 5 groups of traction guide rollers, and motor M11, M12 drive
The Scroll of dynamic two mutual backup；
Above-mentioned 12 axis driving motors and its corresponding 12 axis are divided into 5 subsystems, each subsystem includes 3 electricity
Machine and corresponding 3 axis；3 axis in each subsystem are abstracted as the preposition axis, main drive axis, postposition axis respectively, pass through 2
A PID controller is controlled.
Further, method of the invention further includes transverse gage deviation Controlling model and longitudinal thickness deviation control mould
Type, wherein transverse gage deviation Controlling model includes the following steps:
S1, the first calibrator by being configured in traction element, the film thickness after detecting biaxial tension；
S2, the thickness for detecting the first calibrator obtain thickness difference compared with thickness setting value；
S3, slab PID controller calculate correction value according to the thickness difference, and are controlled by bolt temperature control PID
Device processed is adjusted, and changes temperature-sensitive diebolt temperature, so that film head lip opening degree changes, the thickness of adjustment sheet；Wherein,
Film head lip opening degree corrected parameter is obtained by following transmission function:
Wherein, W is film head lip opening degree corrected parameter, and Ky is film head lip opening degree object variations amount, KxFor bolt
Regulated quantity, maFor displacement ratio parameter, GpFor film head lip cross sectional shape amplification coefficient, T0For thickness setting value, TmFor the first thickness measuring
The film thickness value of instrument detection.
Further, 32 groups of temperature-sensitive diebolts, district grid BOPP raw material are configured in the BOPP bidirectional stretching system
The extrusion output of polymer melt, and each temperature-sensitive diebolt is all made of independent control loop and is controlled.
Further, the longitudinal thickness deviation Controlling model includes the following steps:
S1, the second calibrator by being configured in slab part, the forming slab thicknesses of detection chilling roller outlet；
S2, the film thickness for measuring the second calibrator obtain error signal compared with setting value；
S3, according to the error signal, change the linear velocity of chilling roller, by chilling roller PID regulator to control film longitudinal direction
Thickness deviation.
The film thickness monitoring method of BOPP bidirectional stretching system of the invention, whole system tension can preferably keep permanent
It is fixed, and the decoupling ability of system speed and tension is improved, reduce film longitudinal thickness deviation and transverse gage deviation.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of BOPP bidirectional stretching system.
Fig. 2 is three motor Overlapped control model schematics in control method of the invention.
Fig. 3 is the experimental result picture of three motor Overlapped control models in Fig. 2.
Fig. 4 is that more motor half point bulk weights fold Controlling model schematic diagram in control method of the invention.
Fig. 5 is the composition schematic diagram of longitudinal thickness deviation control loop in control method of the invention.
The composition schematic diagram of vertical and horizontal thickness deviation control loop in control method Fig. 6 of the invention.
Fig. 7 is the transverse gage deviation data comparison of calibrator detection in existing control method and control method of the invention
Figure.
Fig. 8 is the longitudinal thickness deviation data comparison of calibrator detection in existing control method and control method of the invention
Figure.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
BOPP bidirectional stretching system is illustrated first.As shown in Figure 1, BOPP bidirectional stretching system includes squeezing out, casting
Six piece, vertical drawing, horizontal drawing, traction and winding subsystems.
Wherein, extrusion system is mainly squeezed by level-one master, second level master squeezes, first auxiliary crowded, the second auxiliary crowded and filter forms.Tool
Body, the level-one master effect of squeezing is that material is made to receive the incoming heat of external heater, reaches fritting under the shearing, compression of screw rod
State, it is quantitative to squeeze supply material to second level master.Second level master squeezes and is mainly made of fused materials compressional zone with metering zone, and effect is
Polymer is sufficiently melted to, is plasticized and passed through high shear forces, material is mixed uniformly, measures extrusion.Material enters from hopper
It after level-one master squeezes, is plasticized, compresses by feed zone, compressional zone, metering zone, be then fed into second level master and squeeze.Level-one master squeezes screw rod
By two motor drivens, second level master squeezes screw rod by a motor driven, and the discharge pressure of extruder can be changed in adjusting screw rod revolving speed
And the melting temperature of control material.First auxiliary squeeze drives with the second auxiliary pavilion Ji Youdanluo extruder, and major function is to solid
State resin implements the effects of continuous conveying, melting, mixing, exhaust, pressurization, and homogenous plasticized good melt level pressure is quantitatively squeezed
Enter molding die.
Chill roll system is mainly made of film head, heat bolts, chilling roller, 1# calibrator." slab " refers to that molten plastic is being pressed
Under the promotion of power, it is forced through elongated mouth mold, and under external force (electrostatic, air-flow etc.) effect, attaches molten plastic ground velocity
On cold bulging surface, the process of solid-state sheet material is made.Wherein, film head is the key device for being cast slab, it directly determines slab
Shape and thickness uniformity, die head aperture carries out initial adjustment by several plug-type differential bolts with heating coil.
1# calibrator can carry out automatic measuring thickness to slab, and slab thickness value is fed back to control system.Heat bolts: poor including 32 groups
Dynamic formula heat bolts, by manually adjust+automatic control regulative mode carries out the adjusting of extrusion output and film gauge variation and controls.Using
It manually adjusts mode: can be manually rotated bolt, bolt each rotation, die gap just increaseds or decreases [m1-m2] and (sets differential bolt
External screw thread screw pitch be m1, internal screw thread line screw pitch be m2).Controller system is adjusted according to the slab thickness that 1# calibrator detects,
Die head heat bolts temperature is adjusted in real time, and die gap is finely adjusted.The BOPP melt that chilling roller is used to flow out die head is quick
Its glass transition temperature is cooled to hereinafter, forming the slab in homogeneous thickness of glassy state.The purpose of chilling is to make sheet at unformed
Structure reduces its crystallization to the greatest extent, in order to avoid adverse effect is generated to lower road stretching process.Chilling roller is driven by motor M1, control system
It is controlled according to stretched thickness and requires to adjust chilling roller revolving speed.Lead to 30 DEG C or so of cooling water in chilling roller, to guarantee that slab is cooled to 60
DEG C or less.
Vertical pull system is used in a heated state carry out the sheet from slab machine the longitudinal stretching of certain multiple.It is longitudinal
Tensioning system is divided into: preheating zone, drawing zone, shaping area and the area of cooling zone four, by pre- hot-rolling, draw roll, chill roll, rubber pressure
The composition such as roller, temperature control system, lacing film system.Wherein temperature control system is heated in preheating zone using low-pressure steam, drawing zone, shaping area
Then high-temperature high pressure water is used to heat with cooling zone.In drawing zone configuration, there are three draw rolls, are driven respectively by motor M2, M3, M4.
Horizontal pull system is pressed from both sides by baking oven, chain folder and guide rail, plenum chamber, chain tensioning device, guide rail width regulating device, opening and closing
The composition such as device, hot air circulating system, lubricating system and EPC.Transverse stretching machine structure is by into film, preheating, tentering, buffering, sizing and cooling
Equal functional sections composition, each section of heating temperature are not higher than 190 DEG C.The effect of transverse stretching machine is will to exist by the film of longitudinal stretching
Complete the cross directional stretch of film in transverse stretching machine by preheating, tentering, thermal finalization and cooling respectively.Cross directional stretch roller is by motor M5
Driving.
Trailer system: by several traction guide rollers, chill roll, nip rolls, jockey pulley, tracking roller, trimming device and side
Expect the composition such as crushing system, 2# calibrator and corona treatment.Wherein, the BOPP after 2# calibrator is stretched for on-line measurement is thin
The transverse gage of film.Corona treatment makes electrode generate corona discharge, gas electricity by applying high-frequency high-voltage current on the electrode
From energetic ion is generated, Plastic film surface is hit in forceful electric power field action undershoot, activates film surface, to increase the surface of film
Wet tension.Traction guide roller includes 5 groups of traction guide rollers, is driven by motor M6, M7, M8, M9 and M10.
Winding system by touching roller, 1# Scroll, 2# Scroll, capstan head, automatically cut hymenotome and form.1# Scroll, 2# winding
Axis mutual backup, is driven by M11 and M12 respectively, and capstan head is driven by M13.When 1# Scroll is close completely to be covered, 1# is received by capstan head
Spool rotates to backup station, cuts hymenotome and cuts off film, and winding system switches to the work of 2# Scroll, and operator then receives 1#
The finished film of spool lifts outward transport.
Above-mentioned BOPP bidirectional stretching system uses biaxially oriented flat membrane step drawing method.Vertical pull system has 10 pre- hot-rollings, 4
A draw roll, 2 setting rolls.Horizontal pull system is preheated using 4th area, three Qu Lashen, the sizing of 2nd area, the cooling mode in an area.System
Longitudinal stretching is stretched using small―gap suture single-point, and draw ratio is by arbitrarily setting and adjustable, transverse stretch ratio between 1:1 to 1:6
Maximum can reach 1:11.Between cold drum and vertical drawing slow roll and horizontal drawing, and vertical draw is passed between quick roll and horizontal drawing using tension
Sensor carries out speed sync.Speed preset since cold drum to traction link seat is in speed chain relation, guarantees the speed of production line
It is synchronous.In order to realize the stability contorting of above system, the present invention provides a kind of control methods of BOPP bidirectional stretching system.
One aspect of the present invention provides a kind of stretching control method.First from the perspective of below from a kind of relatively simple model
It rises.
As shown in Fig. 2, for three motors subsystem arbitrary in system stretch section: including preposition axis, the first jockey pulley, master
Axis, the second jockey pulley, postposition axis are driven, is controlled using two distributed directors, wherein before being controlled by the first controller
Spindle motor and main drive spindle motor are set, and main drive spindle motor and postposition spindle motor are controlled by second controller, meanwhile, described first
Controller and second controller are exported by the shared a part of superposing control factor a and b to control the main drive spindle motor.
Specifically, the first controller is with membrane tension setting value T at preposition axisu_refWith film speed setting value at main drive axis
VrefTo input, and according to the real-time strain T of film at the first jockey pulleyuWith it is main drive axis at film real-time speed V, before obtaining
Set spindle motor tension force deviation xu=Tu_ref-TuWith speed control deviation xv=Vref- V, and then according to the following formula
Signal u is controlled to preposition shaft torqueuWith main drive spindle motor torque control signal uv1:
Wherein, Pu、Pv1For proportional gain factor, Tiu、Tiv1For integration time constant, iu、ivFor preposition spindle motor and main drive
The register ratio of spindle motor, nu、nvFor preposition spindle motor and the main motor speed for driving spindle motor；
Second controller is with film speed setting value V at main drive axisrefWith membrane tension setting value T at postposition axisw_refIt is defeated
Enter, and according to the real-time strain T of film at the real-time speed V and the second jockey pulley of film at main drive axisw, obtain postposition spindle motor
Tension force deviation xw=Tw_ref-TwWith speed control deviation xv=Vref- V, and then main drive axis is obtained according to the following formula
Motor torque controls signal uv2With postposition spindle motor torque control signal uw:
Wherein, Pw、Pv2For proportional gain factor, Tiw、Tiv2For integration time constant, iw、ivFor postposition spindle motor and main drive
The register ratio of spindle motor, nw、nvFor postposition spindle motor and the main motor speed for driving spindle motor；
Later, main drive spindle motor is obtained according to the Overlapped control factor a and b and controls signal uv=auv1+b·uv2。
In above-mentioned calculating, the real-time strain of film at the first jockey pulleyT1For preposition axis and the first tension
The tension of film, T between roller2For the first jockey pulley and the main tension T for driving film between axisu；Film at second jockey pulley
Real-time strainT3Based on drive the tension of film between axis and the second jockey pulley, T4For the second jockey pulley and postposition axis
Between film tension；T1、T2、T3、T4It is obtained with the real-time speed V of film at main drive axis by following formula:
Wherein, Ωk=Vk/RkFor the revolving speed of kth roller, KkFor motor torque constant, UkFor motor torque, JkIt is used to rotate
Amount, RkFor coil diameter, CfFor friction torque, V0For the specified film speed of film at preposition axial outlet, TkAnd LkFor -1 roller of kth and kth
Tension and film between roller is long, V0For film ideal velocity, T0For film desired tension, E is the Young springform of thin-film material
Amount, S are film sections product；The main real-time speed V=V for driving film at axis3。
As shown in figure 3, for using the experimental result picture after above-mentioned Controlling model, it can be seen that either uncoiling tension and
Winding tension or main drive axle speed all have good stability.
In the following, above-mentioned Controlling model is applied in entire BOPP bidirectional stretching system.As shown in figure 4, entire BOPP is bis-
It include M1-M12 totally 12 axis driving motors to the slab of tensioning system, vertical drawing, horizontal drawing, traction and five parts of winding, wherein electricity
Machine M1 drives chilling roller, and motor M2, M3, M4 drive three draw rolls in longitudinal stretching area, and motor M5 drives the drawing in cross directional stretch area
Roller is stretched, motor M6, M7, M8, M9 and M10 drive 5 groups of traction guide rollers, two mutual backup of motor M11, M12 motor driven
Scroll；Above-mentioned 12 axis driving motors and its corresponding 12 axis are divided into 5 subsystems, each subsystem includes 3 electricity
Machine and corresponding 3 axis；3 axis in each subsystem are abstracted as the preposition axis, main drive axis, postposition axis respectively, pass through 2
A PID controller is controlled.Wherein, two winding arbors are only in the operating condition as the postposition axis of the last one unit.
On the other hand, during stretching, whether crystallization and orientation are uniform, and whether degree size is appropriate, and key is material
The uniform stabilization of material temperature degree.In order to guarantee that the control precision in temperature field, system design use PID temperature control mode.System is thick
Degree control technology detects the thickness of sheet, film product using two calibrators respectively, gives the data feedback measured to control system
System, calculates the thickness deviation of vertical and horizontal, extruder screw revolving speed correction amount is controlled according to film longitudinal thickness deviation,
The temperature of cross-head corresponding site bolt is controlled according to film transverse gage deviation to realize sheet, film thickness simultaneously
Automatic control.
Based on this, another aspect of the present invention additionally provides a kind of film thickness monitoring method.Specifically, film thickness of the invention
Control method uses the following scheme including transverse gage deviation Controlling model and longitudinal thickness deviation Controlling model:
Wherein, as shown in figure 5, longitudinal thickness deviation Controlling model includes following step in film thickness monitoring method of the invention
It is rapid:
First by the second calibrator being configured in chill roll system, the forming slab thicknesses of chilling roller outlet are detected；
The film thickness that the second calibrator is measured later obtains error signal compared with setting value；
Then according to the error signal, change the linear velocity of chilling roller by chilling roller PID regulator, to control film longitudinal direction
Thickness deviation.
Meanwhile as shown in fig. 6, film thickness monitoring method of the invention further comprises transverse gage deviation Controlling model,
Specifically comprise the following steps:
Film thickness first by the first calibrator being configured in trailer system, after detecting biaxial tension；
The thickness that the first calibrator is detected later obtains thickness difference compared with thickness setting value；
Then slab PID controller calculates correction value according to the thickness difference, and is controlled by bolt temperature control PID
Device processed is adjusted, and changes temperature-sensitive diebolt temperature, using the temperature change of the temperature-sensitive bolt of control extruder film head, sends out bolt
Heat is flexible, causes film head lip opening degree to change, the thickness of adjustment sheet；Wherein,
Film head lip opening degree corrected parameter is obtained by following transmission function:
Wherein, Ky is film head lip opening degree object variations amount, KxFor bolt regulated quantity, maFor displacement ratio parameter, GpFor film
Head lip cross sectional shape amplification coefficient, T0For thickness setting value, TmFor the film thickness value of the first calibrator detection.
In the above process, the control of head bolt temperature uses direct feedback, and control system is carried out real by some cycles
When calculate, adjust to clearance-type the voltage and electrified rate of head bolt, reach adjustment bolt temperature-change film head lip opening
Degree-adjusting extrusion output process.
Preferably, 32 groups of temperature-sensitive diebolts, district grid BOPP raw material are configured in above-mentioned BOPP bidirectional stretching system
The extrusion output of polymer melt, and each temperature-sensitive diebolt is all made of independent control loop and is controlled.
The implementation result of above-mentioned film thickness monitoring method of the invention is as shown in attached drawing 7-8.Wherein: Fig. 7 (a) is to use
When existing control method, the transverse gage deviation for sometime putting BOPP film of calibrator detection, there it can be seen that thin
The transverse gage deviation fluctuation of film is bigger, and the transverse gage deviation for having many places has been more than bound threshold value.Fig. 7 (b) is to adopt
With control method of the invention, the transverse gage deviation for sometime putting BOPP film of calibrator detection can therefrom be seen
Out, the transverse gage deviation fluctuation of film is more much smaller than existing control method, and thickness deviation is also only super in the edge of film
Bound threshold value is crossed, thickness average value is also closer to 3.22 μm of setting value.Film is adjusted by control head bolt temperature
The control method of transverse gage deviation plays significant control effect.
When Fig. 8 (a) is using existing control method, the longitudinal thickness deviation of the BOPP film of calibrator detection,
In, it is each to arrange the maximum thickness (highest red point) for representing a certain lengthwise position of film, minimum value (minimum red point) peace
Mean value (black color dots).There it can be seen that the longitudinal thickness deviation fluctuation of film is bigger, there is the longitudinal thickness deviation of many places
It has been more than bound threshold value.Fig. 8 (b) is using control method of the invention, the longitudinal thickness of the BOPP film of calibrator detection
Deviation, there it can be seen that the maximum value of the longitudinal thickness of film, minimum value and average value fluctuation are smaller very than before transformation
It is more.Significant control effect is played by control extruder screw revolving speed come the method for adjusting film longitudinal thickness deviation.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (5)
1. a kind of control method of BOPP bidirectional stretching system, it is characterised in that: for three motor arbitrary in system stretch section
Subsystem: including preposition axis, the first jockey pulley, main drive axis, the second jockey pulley, postposition axis, using two distributed directors into
Row control, wherein preposition spindle motor and main drive spindle motor are controlled by the first controller, and main drive is controlled by second controller
Spindle motor and postposition spindle motor, meanwhile, first controller and second controller pass through superposing control factor a and b shared one
Part output is to control the main drive spindle motor；
First controller is with membrane tension setting value T at preposition axisu_refWith film speed setting value V at main drive axisrefIt is defeated
Enter, and according to the real-time strain T of film at the first jockey pulleyuWith the real-time speed V of film at main drive axis, preposition spindle motor is obtained
Tension force deviation xu=Tu_ref-TuWith speed control deviation xv=Vref- V, and then preposition axis is obtained according to the following formula
Torque control signal uuWith main drive spindle motor torque control signal uv1:
Wherein, Pu、Pv1For proportional gain factor, Tiu、Tiv1For integration time constant, iu、ivFor preposition spindle motor and main drive axis electricity
The register ratio of machine, nu、nvFor preposition spindle motor and the main motor speed for driving spindle motor；
The second controller is with film speed setting value V at main drive axisrefWith membrane tension setting value T at postposition axisw_refIt is defeated
Enter, and according to the real-time strain T of film at the real-time speed V and the second jockey pulley of film at main drive axisw, obtain postposition spindle motor
Tension force deviation xw=Tw_ref-TwWith speed control deviation xv=Vref- V, and then main drive axis is obtained according to the following formula
Motor torque controls signal uv2With postposition spindle motor torque control signal uw:
Wherein, Pw、Pv2For proportional gain factor, Tiw、Tiv2For integration time constant, iw、ivFor postposition spindle motor and main drive axis electricity
The register ratio of machine, nw、nvFor postposition spindle motor and the main motor speed for driving spindle motor；
Later, main drive spindle motor is obtained according to the Overlapped control factor a and b and controls signal uv=auv1+b·uv2。
2. the control method of BOPP bidirectional stretching system as described in claim 1, it is characterised in that: at first jockey pulley
The real-time strain of filmT1The tension of film, T between preposition axis and the first jockey pulley2For the first jockey pulley and
The tension of film between main drive axis；The real-time strain of film at second jockey pulleyT3Based on drive axis and the
The tension of film, T between two jockey pulleys4The tension of film between the second jockey pulley and postposition axis；T1、T2、T3、T4With main drive axis
The real-time speed V of place's film is obtained by following formula:
Wherein, Ωk=Vk/RkFor the revolving speed of kth roller, KkFor motor torque constant, UkFor motor torque, JkFor rotary inertia, RkFor
Coil diameter, CfFor friction torque, TkAnd LkTension and film between -1 roller of kth and kth roller is long, V0For film ideal velocity, T0For
Film desired tension, E are the Young's modulus of elasticity of thin-film material, and S is film sections product；The main real-time speed V for driving film at axis
=V3。
3. the control method of BOPP bidirectional stretching system as claimed in claim 1 or 2, it is characterised in that: the BOPP is two-way
The slab of tensioning system, vertical drawing, horizontal drawing, traction and five parts of winding include M1-M12 totally 12 axis driving motors, wherein motor
M1 drives chilling roller, and motor M2, M3, M4 drive three draw rolls in longitudinal stretching area, and motor M5 drives cross directional stretch area draw roll,
M6, M7, M8, M9 and M10 drive 5 groups of traction guide rollers, and motor M11, M12 drive the Scroll of two mutual backup；
Above-mentioned 12 axis driving motors and its corresponding 12 axis are divided into 5 subsystems, each subsystem include 3 motors and
Corresponding 3 axis；3 axis in each subsystem are abstracted as the preposition axis, main drive axis, postposition axis respectively, pass through 2
PID controller is controlled.
4. the control method of BOPP bidirectional stretching system as claimed in claim 3, it is characterised in that: the BOPP biaxial tension
32 groups of temperature-sensitive diebolts, the extrusion output of district grid BOPP raw polymer melt, and each temperature-sensitive die head are configured in system
Bolt is all made of independent control loop and is controlled.
5. the control method of BOPP bidirectional stretching system as claimed in claim 4, which is characterized in that the longitudinal thickness deviation
Control includes the following steps:
S1, the second calibrator by being configured in slab part, the forming slab thicknesses of detection chilling roller outlet；
S2, the film thickness for measuring the second calibrator obtain error signal compared with setting value；
S3, according to the error signal, change the linear velocity of chilling roller, by chilling roller PID regulator to control film longitudinal thickness
Deviation.
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| CN113275209B (en) * | 2021-07-21 | 2021-09-28 | 浙江双元科技股份有限公司 | Lithium battery pole piece coating thickness detection device, system and method |
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| US6051177A (en) * | 1996-03-11 | 2000-04-18 | Ward; Gregory F. | Thermo-mechanical modification of nonwoven webs |
| CN101422961A (en) * | 2008-11-10 | 2009-05-06 | 大连橡胶塑料机械股份有限公司 | Tension control system of plastic packaging film production line |
| JP2014054797A (en) * | 2012-09-13 | 2014-03-27 | Idemitsu Unitech Co Ltd | Biaxially oriented nylon film, laminate film, laminate packaging material, and production method of biaxially oriented nylon film |
| CN106339010A (en) * | 2016-11-18 | 2017-01-18 | 威科达（东莞）智能控制有限公司 | High-precision tension control system and control method |
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| US6051177A (en) * | 1996-03-11 | 2000-04-18 | Ward; Gregory F. | Thermo-mechanical modification of nonwoven webs |
| CN101422961A (en) * | 2008-11-10 | 2009-05-06 | 大连橡胶塑料机械股份有限公司 | Tension control system of plastic packaging film production line |
| JP2014054797A (en) * | 2012-09-13 | 2014-03-27 | Idemitsu Unitech Co Ltd | Biaxially oriented nylon film, laminate film, laminate packaging material, and production method of biaxially oriented nylon film |
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