CN107175808A - Bopp film thickness uniformity control method - Google Patents
Bopp film thickness uniformity control method Download PDFInfo
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- CN107175808A CN107175808A CN201710429685.5A CN201710429685A CN107175808A CN 107175808 A CN107175808 A CN 107175808A CN 201710429685 A CN201710429685 A CN 201710429685A CN 107175808 A CN107175808 A CN 107175808A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims abstract description 36
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000011888 foil Substances 0.000 claims abstract description 3
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000003306 harvesting Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000010408 film Substances 0.000 description 70
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 229920003023 plastic Polymers 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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Classifications
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92152—Thickness
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of thick uniformity control method of BOPP film, periodically gather film thickness, obtain the film profile image exported from THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS, based on the corresponding thickness value of each bolt position of extruder die head on the image zooming-out thickness curve, calculate middle part bolt the thickness deviation of its corresponding position and its thickness deviation average of position corresponding to bolt is closed in left and right, the controlled quentity controlled variable obtained corresponding to the bolt is calculated through fuzzy reasoning and carries out temperature control to the bolt to adjust film thickness through die head adjuster.Based on die lips aperture control expert's operating experience, the present invention decoupling between die head adjacent bolt is realized by fuzzy control so that BOPP film can keep in production the uniform of thickness with stably.
Description
Technical field
The present invention relates to film fabrication techniques field, and in particular to a kind of thick uniformity control method of BOPP film.
Background technology
BOPP film be bidirectional stretching polypropylene film be as obtained by biaxial tension, it be by physics, chemistry and
The plastic product that the means specially-shaped such as machinery is processed.BOPP production lines are that one non-linear, time-varying, the complexity postponed greatly
System.Its technological process mainly includes：Raw materials melt, extrusion, cooling and shaping, longitudinal stretching, cross directional stretch, trimming, at corona
Manage, batch.
It is used as physical and mechanical properties such as tensile strength, elongation at break, turbidity, the gloss of BOPP film product quality indicator
Deng because depending mainly on the attribute of material in itself, so all easily reaching requirement.And it is used as the main of re-workability and performance
Con trolling index, i.e. film gauge variation and Film Average Thickness deviation, then depend mainly on the manufacturing process of film.Even if manufacture
During plastics thickness control in the deviation range allowed in standard, but through thousands of tunics wind it is accumulative after, thickness deviation is big
Position on may form the bad defects such as hoop, sudden and violent muscle or chase, the reprocessing that these defects directly influence user is used,
Such as dislocation of color printing chromatography or the irregular corrugation phenomenon of gluing, make it reduce or lose use value.So in BOPP film productions
Between the quality of most critical topic be how to improve with stabilizing films thickness and precision, also exactly this film thickness precision just directly affect
To the use value of film, the commodity value of film is determined.
The control of film thickness is based on infrared ray, X-ray, β ray equal thickness detection techniques.Such as Application No.
2014201577223 Chinese patent is obtained after film thickness by X-ray scanning, and two PID regulators are respectively adopted to enter
The control of the horizontal and vertical thickness of row film.The Chinese patent of Application No. 2007201517097 also uses similar side
Method, it is pointed out simultaneously, in order to obtain film in uniform thickness, it is necessary to realize that thickness measurements and measurement position are accurately positioned.
The Chinese patent of Application No. 2015102638543 is then contrasted by the thickness value to measuring with thickness value set in advance
Extrusion capacity at analysis, regulation extruder die head, to realize the uniformity regulation of extrusion composite membrane longitudinal thickness.
The thickness control of current BOPP film manufacture is realized based on the discrete control system in production line mostly, often
Using traditional pid control mode.But, put into practice and find by long period of operation, on the one hand due to BOPP in process of production
Stretch and non-homogeneous so that there is error between fastener locations and physical location；Deposited between still further aspect, adjacent bolt
In coupling, the change that single bolt will cause other positions thickness is adjusted, moreover, with the passage of extruder use time,
The small variations of mechanism in itself will aggravate these problems.Therefore, traditional PID control is difficult to obtain preferable thickness uniformity.
The content of the invention
In view of this, it is an object of the invention to by the observation analysis to extruder die head lip aperture control law,
The fuzzy control method that a kind of energy utilizes expert's operating experience is provided, spiral shell is closed in corresponding bolt and its left and right in itself by controlled volume
The thickness deviation of bolt is combined as array as input quantity, is calculated through fuzzy reasoning and obtains output quantity and come through die head adjuster to spiral shell
Bolt carries out temperature control, to obtain the uniformity of film thickness.
The technical solution of the present invention is to provide a kind of thick uniformity control method of BOPP film, and it comprises the following steps：
A film thickness) is gathered, the film profile image exported from THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS is obtained；
B a thickness curve) is obtained based on the profile image, each bolt of extruder die head on thickness curve is extracted in analysis
The corresponding thickness value in position；
C the thickness deviation of its corresponding position) is calculated to middle part bolt and its thickness of position corresponding to bolt is closed in left and right
Deviation average is spent, the controlled quentity controlled variable obtained corresponding to the bolt is calculated through fuzzy reasoning and temperature is carried out to the bolt through die head adjuster
Degree control.
Preferably, further comprising the steps of：During initialization by guidance panel input film product thickness setting value with
And the initial parameter value calculated.
Preferably, the calibrator includes the first calibrator and the second calibrator, film raw material melt is squeezed from extruder
Slab is cured as through being cooled and shaped unit after going out, it is mother that slab drawn unit, which is stretched as after wide volume film by rolling unit harvesting,
Volume, first calibrator and the second calibrator are located at draw unit two ends and carry out thickness to the slab and wide volume film respectively
Monitoring.
Carried out preferably, the fuzzy reasoning is calculated in On-line accoun mode, it is defeated to two according to span in advance
Enter the membership function of one output quantity ambiguity in definition variable of amount, and summarized the experience out fuzzy control rule according to execute-in-place
Storehouse；Then, fuzzy control calculating is periodically carried out, i.e., the thickness deviation and its left and right of this bolt position are closed on corresponding to bolt
The thickness deviation average of position, is mapped to fuzzy domain, then completed according to fuzzy relation by indistinct logic computer through defuzzification interface
Fuzzy reasoning, reality output amount is changed into by ambiguity solution interface by the fuzzy value that inference machine is drawn.
Carried out preferably, the fuzzy reasoning calculates the fuzzy control table mode generated offline to inquire about, prior basis
Span is summarized the experience to the membership function of two input quantities, one output quantity ambiguity in definition variable according to execute-in-place
Go out fuzzy rule base, corresponding fuzzy control is obtained further according to membership function and fuzzy rule base off-line calculation
Table；Then, fuzzy control calculating is periodically carried out, i.e., the thickness deviation and its left and right of this bolt position are closed on corresponding to bolt
The thickness deviation average of position, inquires about fuzzy control table after quantifying by domain, obtain corresponding output quantity.
Using the solution of the present invention, compared with prior art, with advantages below：The present invention is produced applied to BOPP
The film profile picture signal of plastics thickness control, in real time collection calibrator, analyzing and processing obtains the real-time thickness parameter of film,
Decoupling between die head adjacent bolt is realized by fuzzy control, the expert's warp that make use of extruder die head lip aperture to control
Test, realize the uniform and stable of BOPP film thickness, the consistent of its longitudinal thickness is realized further through feedback control.
Brief description of the drawings
Fig. 1 is the structural representation for the BOPP film production line for applying the thick uniformity control method of BOPP film of the present invention；
Fig. 2 is film profile image schematic diagram corresponding with diebolt；
Fig. 3 is BOPP film thickness uniformity control flow schematic diagram；
Fig. 4 is that BOPP film thickness obscures control flow schematic diagram；
Fig. 5 is each variable membership degree function schematic diagram of BOPP film thickness fuzzy control；
Fig. 6 is BOPP film thickness fuzzy control rule table；
Fig. 7 is BOPP film thickness fuzzy control table.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing is adopted
With more simplified form and using non-accurately ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
As shown in figure 1, applying the BOPP film production line of the thick uniformity control method of BOPP film of the present invention, it also includes
Extrude unit 1, be cooled and shaped unit 2, draw unit 3, thickness measuring unit, controller 5, rolling unit 6, wherein extrusion unit 1 is wrapped
Extruder 7 is included, there is die head 8 in extruder front end, draw unit 3 includes vertical drawing-die block 9 and horizontal drawing-die block 3, and thickness measuring unit is then wrapped
Include the first calibrator 401, the second calibrator 402 and digital display equipment 11.Apply the thick uniformity control method of BOPP film of the present invention
Controller 5 include thickness image pickup model 12, image processing module 13, calculate with output module 14, wherein calculate with it is defeated
Go out module 14 respectively by die head adjuster 15, frequency converter 16 with die head 8 and extruder 7 to be connected.
Film raw material is extruded from melting after the dog-house input of extruder 7 for melt from die head 8, then through being cooled and shaped unit
2 are cured as slab, and slab drawn unit 3 is stretched as after wide volume film being received and kept as parent roll by rolling unit 6, subsequently by order
It is required that being cut and being packed to parent roll.Because thickness plays vital effect to product quality, therefore, in BOPP film
Often are carried out by thickness and is monitored in real time for slab and wide volume film respectively with two calibrators in production, two calibrators are all connected with number
Show equipment to show slab or the wide profile image for rolling up film.The first calibrator in two calibrators above to slab thickness measuring
401 use when being pulled out at the beginning of film, when just pause is used after the second calibrator 402 input below.
As shown in Figure 2 a, in the film profile image that thickness image pickup model 12 is collected from calibrator, have respectively
Two width sectional thickness curve maps and some character informations；Wherein, a-quadrant represents the corresponding thickness of film thickness profile axis of abscissas
The longitudinal coordinate scale value 5% of coordinate system in a reference value 35.5um and curve picture；C regions are the mesh for stating current film profile
Thickness curve is marked, its reference axis is set by the description of a-quadrant, the boost line parallel with reference axis is also contained in coordinate system；B
AVG=35.51um refers to the thickness average value of the current film profile shown by C region curves in region, and R=2.83% is then
It is the statistics extreme difference value fluctuated above and below curve.
With reference to shown in Fig. 2 a and 2b, the film profile thickness curve corresponds to extruder die hook bolt collection in the horizontal
Close.Wherein, as shown in Figure 2 b, lower section rectangle signal die head, its internal triangle is bolt.BOPP film production is horizontal in slab
During drawing, its draw ratio is 7-9 times, and for such as 8280mm wide volume specification, its slab width is about 1000mm, die head spiral shell
When bolt is 39, each bolt correspondence slab width is about 25mm, removes two ends comparatively fixed bolt, middle part is each adjusted
It is about 1/35 to save width range of the bolt correspondence in figure.As can be seen from the figure：
When carrying out the aperture control of die lips, if the bolt at R only enters trip temperature by this place thickness deviation size
Regulation take a larger output valve, while be also at S be controlled by this place thickness deviation size take one close to 0 value；That
, due to deviation very little at S, although the controlled quentity controlled variable very little of itself at S, but it is due to be opened at the influence of bolt controlled quentity controlled variable at R, R
Spending will diminish and will draw so that the lip at adjacent S diminishes, so that the deviation at S is changed into negative value, and deviation range
It is bigger than initial value, it is not inconsistent with ideal effect.
Therefore, present invention introduces practical operation experience, being fuzzy control rule by these summaries of experience, passing through fuzzy control
To adjust the uniformity of thickness.And before control, first to be obtained by image processing module and be marked with diebolt position
Film profile thickness value set simultaneously sends the data acquisition system to calculating and output module, is obtained so as to calculate at each bolt
Thickness deviation values.
During thickness control, image processing module wants output token to have the film profile thickness value collection of diebolt position
Close, the film profile image of its foundation, as shown in Figure 2 a, its content includes：The thickness represented in different colors respectively
Curve, reference axis and the boost line parallel with reference axis.
The thick uniformity control method of BOPP film of the present invention, carries out obtaining diebolt after opposite side on curve to profile image
Correspondence position；While the root thickness of thickness curve in the film profile image can be read or be extracted by character recognition
Value and coordinate scale value, so as to go out corresponding film thickness at each bolt according to these numerical computations, output token has mould
The film profile thickness value set of hook bolt position.
As shown in figure 3, based on thickness value set, the thick uniformity control method of BOPP film of the present invention, by fuzzy control come
The control of film thickness uniformity is carried out, BOPP film thickness uniformity control flow of the invention is：
(L1) mark slab after melt extrusion, slab before the stretching after Thickness sensitivity is carried out by calibrator, generate film
Profile image；
(L2) thickness image pickup model is after digital display equipment collection film profile image, by image processing module to the figure
As carrying out Treatment Analysis, the film profile thickness value set for being marked with diebolt position is obtained；
(L3) calculate with output module to each element of described thickness value set, kth segment data is taken, by its thickness value
Acquisition deviation is compared with product thickness preset value to combine, it is equal that the value gives its internal fuzzy control submodule to carry out thickness
Evenness is controlled, and output control amount adjusts the dutycycle of k-th of bolt heating waveform by die head adjuster, so as to adjust this Duan Mo
The aperture of head lip；
(L4) wait next cycle to be timed to come, return to step L2.
In above control process, thickness deviation is converted to temperature compensation value by fuzzy control submodule, is adjusted by die head
Device is saved in the way of dutycycle to control the break-make of solid-state relay on computer heating control passage, so as to control current diebolt
Temperature.Due to the expansion and contraction property of metal, the gap compression of slab lip when heater is turned on, such slab lip it is thin
Film thickness can be gradually reduced, on the contrary then increase.
Calculate can also adjust extrusion capacity with output module by Frequency Converter Control extruder rotating speed, and control is also included inside it
The speed and the submodule of temperature of each roller in the vertical drawing of system, horizontal drawing and rolling unit, according to production thickness according to default technique
Parameter is adjusted.
Fig. 4 to 7 gives the operation principle of fuzzy control submodule, wherein, it is illustrated in figure 4 BOPP film thickness moulds
Control flow is pasted, it comprises the following steps：
(M1) fuzzy rule base is summed up to the control experience of die lips aperture with reference to experienced operator；Pass through reality
Optimal control parameter is tested, includes the quantizing factor and the scale factor of output control amount of input variable, Initialize installation；
(M2) k-th of bolt and its left and right phase are extracted from the film profile thickness value set for being marked with diebolt position
Thickness deviation values at adjacent bolt, are compared with product thickness, calculate basic deviation es and adjacent deviation ea；
(M3) again by the degree of membership of respective fuzzy subset after es and ea being quantified by quantizing factor ks and ka respectively
Function Mapping is to fuzzy domain, and then, the rule base represented by indistinct logic computer according to fuzzy relation completes fuzzy reasoning, finally
The fuzzy value that inference machine is drawn is changed into digital quantity through ambiguity solution interface, and is multiplied by after scale factor ku that to obtain controlled quentity controlled variable ht defeated
Go out and give die head adjuster.
Fig. 5 gives each of two input fuzzy variable basic deviation ES and adjacent deviation EA and output fuzzy variable HT
Fuzzy subset's membership function, wherein, EX, EA and HT fuzzy subset are 7：{ NB, NM, NS, ZE, PS, PM, PB }, respectively
The membership function of fuzzy subset uses triangle；Because the shape of membership function is more sharp, control sensitivity is higher, because
This, it is steep that basic deviation ES and adjacent deviation EA are set to comparison in the shape of null value areas adjacent.Without loss of generality, Fig. 5
In each fuzzy variable domain all normalize to [- 1,1] it is interval, can specifically be adjusted according to different situations in practical operation.
In production process, when es is negative value, illustrates that this section of die lips aperture is too small, it should increase aperture, adjust spiral shell
Bolt will reduce temperature, i.e. controlled quentity controlled variable for negative value.
With reference to expert's operating experience, 29 fuzzy control rules as shown in Figure 6 can be summarized, are used per rule
" IF A THEN B " forms are described, such as：
IF ES=NB and EA=NB or NM THEN HT=NB.
Adjacent deviation can take the deviation average when each one of front bolt or so or each two bolts, and fuzzy reasoning is used and taken
Greatly-and small (MAX-MIN) method is taken, ambiguity solution uses gravity model appoach.
Preferably, when being adjusted to bolt, a progress aperture control can be spaced, or several bolts are one group.
Preferably, the amplitude of accommodation can be realized so that middle part bolt by non-uniform Distribution by changing scale factor ku
Regulated quantity is small, and both sides are then gradually big.
Preferably, realizing that fuzzy control submodule can also be by the way of inquiry table for ease of computer.Possible
Input quantity all quantify onto the element of fuzzy variable domain, and be combined using the element for inputting domain as input quantity, from
Line obtains relation between input quantity domain element and output quantity domain element by FUZZY ALGORITHMS FOR CONTROL, and result of calculation is exactly to inquire about
Table, table storage is used for online query.
It is illustrated in figure 7 in the inquiry table of BOPP film thickness fuzzy control in the present invention, table and gives input quantity and defeated
Corresponding relation of the output on each discrete point.Inquire about for convenience, without loss of generality, wherein by basic deviation es and output control
Amount ht domain is set in [- 6,6] interval, and adjacent deviation ea domain is then set in [- 3,3] interval.Each control week
Phase, after current es and ea progress quantizations are rounded, directly inquiry control table is that can obtain controlled quentity controlled variable.
By fuzzy control, the coupled problem between adjacent bolt, the average deviation of BOPP film thickness can be preferably solved
It is stably controlled within 0.02%.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (5)
1. a kind of thick uniformity control method of BOPP film, it comprises the following steps：
A film thickness) is gathered, the film profile image exported from THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS is obtained；
B a thickness curve) is obtained based on the profile image, each bolt position of extruder die head on thickness curve is extracted in analysis
Corresponding thickness value；
C) calculate middle part bolt the thickness deviation of its corresponding position and its left and right close on position corresponding to bolt thickness it is inclined
Poor average, calculates the controlled quentity controlled variable obtained corresponding to the bolt through fuzzy reasoning and enters trip temperature control to the bolt through die head adjuster
System.
2. the thick uniformity control method of a kind of BOPP film according to claim 1, it is characterised in that also including following step
Suddenly：Film product thickness setting value and the initial parameter value of calculating are inputted by guidance panel during initialization.
3. the thick uniformity control method of a kind of BOPP film according to claim 1, it is characterised in that the calibrator includes
First calibrator and the second calibrator, film raw material melt are cured as slab after extruder extrusion through being cooled and shaped unit, cast
It is parent roll, first calibrator and the second calibrator point that piece drawn unit, which is stretched as after wide volume film by rolling unit harvesting,
Not Wei Yu draw unit two ends thickness monitor is carried out to the slab and wide volume film.
4. a kind of thick uniformity control method of BOPP film according to claim 1, it is characterised in that the fuzzy reasoning meter
Calculation is carried out in On-line accoun mode, and two input quantities, one output quantity ambiguity in definition variable is subordinate to according to span in advance
Function is spent, and is summarized the experience out fuzzy rule base according to execute-in-place；Then, fuzzy control calculating is periodically carried out, i.e.,
Thickness deviation and its left and right to this bolt position close on the thickness deviation average of position corresponding to bolt, are reflected through defuzzification interface
Fuzzy domain is mapped to, then is obtained inference machine by ambiguity solution interface according to fuzzy relation completion fuzzy reasoning by indistinct logic computer
The fuzzy value gone out changes into reality output amount.
5. a kind of thick uniformity control method of BOPP film according to claim 1, it is characterised in that the fuzzy reasoning meter
The fuzzy control table mode generated offline to inquire about is calculated to carry out, it is fixed to two input quantities, one output quantity according to span in advance
The membership function of adopted fuzzy variable, and summarized the experience out fuzzy rule base according to execute-in-place, further according to degree of membership letter
Number and fuzzy rule base off-line calculation obtain corresponding fuzzy control table；Then, fuzzy control calculating is periodically carried out, i.e.,
Thickness deviation and its left and right to this bolt position close on the thickness deviation average of position corresponding to bolt, are looked into after quantifying by domain
Fuzzy control table is ask, corresponding output quantity is obtained.
Priority Applications (1)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112996647A (en) * | 2018-11-06 | 2021-06-18 | 温德默勒及霍乐沙两合公司 | Method and device for controlling the nozzle gap of an outlet nozzle of a flat film machine |
| CN113459370A (en) * | 2021-06-16 | 2021-10-01 | 广东金明精机股份有限公司 | Film stretching thickness control method |
| US11964419B2 (en) | 2018-11-06 | 2024-04-23 | Windmöller & Hölscher Kg | Method and device for controlling a thickness profile of a film web |
| US11964418B2 (en) | 2018-11-06 | 2024-04-23 | Windmöller & Hölscher Kg | Adjusting device and method for controlling an exit thickness of a nozzle exit gap of a flat film machine |
| US11999091B2 (en) | 2018-05-16 | 2024-06-04 | Windmöller & Hölscher Kg | Method for automatically regulating the size of a slot of a nozzle assembly and control and/or regulation system |
| US12059833B2 (en) | 2018-05-16 | 2024-08-13 | Windmöller & Hölscher Kg | Method for automatically regulating the size of a slot of a nozzle assembly and control and/or regulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11999091B2 (en) | 2018-05-16 | 2024-06-04 | Windmöller & Hölscher Kg | Method for automatically regulating the size of a slot of a nozzle assembly and control and/or regulation system |
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| CN112996647A (en) * | 2018-11-06 | 2021-06-18 | 温德默勒及霍乐沙两合公司 | Method and device for controlling the nozzle gap of an outlet nozzle of a flat film machine |
| US11964419B2 (en) | 2018-11-06 | 2024-04-23 | Windmöller & Hölscher Kg | Method and device for controlling a thickness profile of a film web |
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| CN113459370A (en) * | 2021-06-16 | 2021-10-01 | 广东金明精机股份有限公司 | Film stretching thickness control method |
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