CN107399072B - BOPP extruder die head bolt positioning method based on Thickness sensitivity - Google Patents
BOPP extruder die head bolt positioning method based on Thickness sensitivity Download PDFInfo
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- CN107399072B CN107399072B CN201710429870.4A CN201710429870A CN107399072B CN 107399072 B CN107399072 B CN 107399072B CN 201710429870 A CN201710429870 A CN 201710429870A CN 107399072 B CN107399072 B CN 107399072B
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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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
- B29C48/313—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections by positioning the die lips
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring 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
- B29C2948/92009—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
- B29C2948/92704—Temperature
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity, each bolt thickness value and each bolt initial position are calculated based on the thickness curve data that acquisition unit acquires by computing unit, sentence and knows unit retrieval and identify bolt to be processed, the not good enough movement of film thickness zero bias before and after comparing adjusting after adjusting unit to bolt to be processed progress temperature adjusting, and each bolt estimated location is adjusted according to amount of movement.The present invention can quickly be accurately positioned diebolt, and output token has the film profile thickness value number of all diebolt positions to set, and adjusting actuating quantity is small in position fixing process, avoid influence of the long-time bolt heating to normally producing.
Description
Technical field
The present invention relates to film fabrication techniques fields, and in particular to a kind of BOPP extruder die head spiral shell based on Thickness sensitivity
Bolt localization method.
Background technique
BOPP film, that is, 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 process.BOPP production line is a complicated nonlinear system.Its technique stream
Journey specifically includes that raw material melting, extrusion, cooling and shaping, longitudinal stretching, cross directional stretch, trimming, sided corona treatment, batches.
Physical mechanical property such as tensile strength, elongation at break, turbidity, gloss as BOPP film product quality indicator
Deng because depending mainly on the attribute of material itself, so all easily reaching requirement.And as the main of re-workability and service 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
For plastics thickness control in the deviation range that standard allows, but after the winding of thousands of tunics is accumulative, thickness deviation is big in the process
Position on may form the bad defects such as hoop, sudden and violent muscle or chase, the reprocessing that these defects directly influence user uses,
Such as phenomena such as the dislocation of color printing chromatography or gluing irregular corrugation, it is made to reduce or lose use value.So in BOPP film production
Topic is how to improve and stabilizing films thickness and precision between the quality of most critical.
For plastics thickness control based on the real-time detection to thickness, it is logical that such as application No. is 2014201577223 Chinese patents
After crossing X-ray scanning acquisition film thickness, two PID regulators are respectively adopted to carry out the control of the horizontal and vertical thickness of film
System, similar method is also used application No. is 2007201517097 Chinese patent, is pointed out simultaneously, in order to obtain thickness
Uniform film, it is necessary to realize that thickness measurements and measurement position are accurately positioned.Application No. is 2014204575910 China
Patent then carries out the alignment of basement membrane by deckle.
Currently, carrying out the corresponding common method of bolt to the thickness data of calibrator output, there are mainly two types of, first is that
It crosses and marks at different bolts, corresponding place is then found on calibrator scanning support, to determine the position of bolt；Two
It is also to measure the developed width of film web while detecting section with calibrator, calculate film referring to the width of die head
Necking down amount, and then diebolt is corresponded to.Both methods is required to manually carry out auxiliary mark according to practical condition
Know, measure and judge, artificial judgment is not only inaccurate, can not also stablize.Due to lacking the continuous accurate positionin to film profile,
The thickness control effect of film and the quality of produced product suffer from influence.For this reason, it may be necessary to solve automatically defeated to calibrator
Film profile thickness curve out carries out the problem of bolt positioning.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of sides that calibrator can be assisted to carry out thickness measuring positioning to bolt
Method, the bolt selected by dynamic regulation are handled and are calculated to the film profile thickness curve of calibrator output, judge spiral shell
The deviation of anchoring position and corresponding adjustment bolt position, so that extruder die hook bolt be accurately positioned, output token has mould
The film profile thickness value set of hook bolt position, provides for Plastics Thickness Control System and improves accurate feedback signal.
The technical solution of the invention is as follows, provides a kind of BOPP extruder die hook bolt positioning side based on Thickness sensitivity
Method includes the following steps:
T1) acquisition unit obtains film profile thickness curve data from calibrator, and it is corresponding that curve is calculated in computing unit
Thickness value and carry out bolt initial alignment, save the data in data storage cell；
T2) sentence and know unit progress bolt retrieval, specify one group of adjacent bolt as bolt to be processed, retrieval, record two
The abscissa XP for the point that thickness deviation is zero between bolt；Meanwhile by adjusting unit by executing agency to two bolts into
Row is controlled in the ratio of respective thickness deviation, changes the aperture of extruder lip by adjusting bolt temperature；
T3 it) waits ratio control to complete, sentences not good enough, note of knowing the zero bias retrieved between one group of adjacent bolt again of unit
Its abscissa is XQ；
T4) sentence and know judgement and adjusting that unit carries out bolt location estimated bias, compare XQ and XP, if the two difference is more than
Given threshold then continues multilevel iudge, moves to right all bolts if XQ is less than XP, otherwise moves to left all bolts, Zhi Hougeng
New fastener locations set；If both XQ and XP difference are within the set threshold range, terminate to position, output token has die head
The film profile thickness value set of bolt location.
Preferably, the film profile thickness curve data are expressed with film profile image format, wrapped in described image
A film thickness curve, reference axis and the auxiliary line parallel with reference axis indicated in different colors respectively is included, and to indicate
The character of the film thickness curve root thickness value, coordinate scale value, thickness average value.
Preferably, the initial alignment sequentially includes the following steps: each bolt uniform mapping after opposite side by computing unit
Onto curve horizontal axis, fastener locations set and the film profile thickness value set for being marked with diebolt position are updated.
Preferably, further comprising the steps of: sentencing and know the phase that unit retrieves all thickness deviation contrary signs in the search cycle
Adjacent bolt combination selects to combine minimum one group of interior difference as bolt to be processed.
Preferably, the adjusting unit controls diebolt solid-state relay by executing agency with PWM mode
On-off, so that the aperture of die head section where adjusting the bolt by the temperature for controlling bolt, thin corresponding to the bolt to realize
The thickness of film section is adjusted.
Preferably, the adjusting unit controls diebolt solid-state relay by executing agency in a manner of PFM
On-off, so that the aperture of die head section where adjusting the bolt by the temperature for controlling bolt, thin corresponding to the bolt to realize
The thickness of film section is adjusted.
Using the solution of the present invention, compared with prior art, it is online to have the advantage that the present invention is applied to film production
The auxiliary positioning of Thickness sensitivity is adjusted and not good enough according to zero bias after adjusting by one group of bolt to thickness deviation contrary sign
Position is mobile, is accordingly adjusted, is realized to the automatic accurate fixed of measured film thickness position to current fastener locations
Position, effectively prevents the influence artificially to judge incorrectly, provides real-time foundation to carry out the control of film thickness consistency.The present invention
It is adjusted by bolt only small to thickness deviation to carry out auxiliary positioning, it is small to adjust actuating quantity；And automatic positioning process
Short, fast and accurately bolt positioning is avoided that in BOPP film manufacturing process that thickness deviation is difficult to the problem of being zeroed.
Detailed description of the invention
Fig. 1 is BOPP technological process of production schematic diagram；
Fig. 2 is the structural schematic diagram for applying extruder die head bolt positioning device of the invention；
Fig. 3 is extruder die head partial structural diagram；
Fig. 4 is calibrator display interface figure in BOPP production；
Fig. 5 is extruder die hook bolt deviations schematic diagram；
Fig. 6 is that film thickness adjusts schematic diagram when diebolt positioning is to the right；
Fig. 7 is that film thickness adjusts schematic diagram when diebolt positioning is to the left；
Fig. 8 is that the automatic bolt of the present invention positions work flow diagram；
Fig. 9 is to adjust unit to control signal schematic representation.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
As shown in Figure 1, BOPP film production is since raw material melting, it is sheet, that is, slab through extrusion molding, slab is again
It is wide volume film that it is thin, which to stretch broadening exhibition, through vertical and horizontal, the processing such as trimming and corona is then carried out in distraction procedure, finally
Winding is big parent roll, subsequent that parent roll is cut and packed by order requirements.Since thickness plays to Guan Chong product quality
Therefore the effect wanted often is carried out thickness and supervised in real time to slab and wide volume film respectively in BOPP production with two calibrators
Survey, two calibrators can externally export the thickness data collection of section, while they be also connected with display with show slab or
The profile image of width volume film.In two calibrators front to slab thickness measuring that at the beginning of film pull-out when use, wait until
Just pause uses after second calibrator investment next.
As shown in Fig. 2, applying the extruder die head bolt positioning device 100 of the method for the present invention comprising acquisition unit
110, computing unit 120, sentence and know unit 130, adjust unit 140 and data storage cell 150.Acquisition unit 110 is from calibrator
Computing unit 120 is sent to after obtaining film profile thickness curve data；The initial meter of bolt location is carried out by computing unit 120
It calculates, and is marked on the abscissa of thickness curve collected, output token has the film profile thickness value of diebolt position
Set, is stored in data storage cell 150；Sentence and know unit 130 according to current film profile thickness value set, retrieval is known
Not Chu bolt to be processed, the bolt to be processed in extruder 300 is carried out by executing agency 200 by adjusting unit 140
Temperature control, adjusts die lips aperture, to adjust film thickness；Sentencing knowledge unit 130 will also be to the thickness after above-mentioned adjusting
Change result and carry out quadratic search and differentiation, then correspondingly adjustment bolt position, updates interior in data storage cell 150
Hold.
In conjunction with shown in Fig. 2 and Fig. 3, the die head of extruder 300 includes upper and lower two lips 310, forms lip between lips
330, lip opening size is adjusted by transversely arranged heat bolts 320.The present invention is to carry out the accurate positionin of diebolt,
Need to carry out the part bolt 320 on extruder die head dynamic regulation with auxiliary judgment.
The collected film profile thickness curve data of acquisition unit institute, can be the numerical string arranged by certain format,
It is also likely to be to be presented with film profile image format, the calibrator as is to be conveyed to display with VGA image.
As shown in figure 4, thering are two width to cut open respectively in the film profile data acquired with image format i.e. film profile image
Face thickness curve graph and some character informations；Wherein, a-quadrant indicates the corresponding thickness a reference value of film thickness profile axis of abscissas
The longitudinal coordinate scale value 5% of coordinate system in 35.5um and curve picture；The region C is the target thickness for stating current film profile
It writes music line, reference axis is set by the description of a-quadrant, and the auxiliary line parallel with reference axis is also contained in coordinate system；B area
Middle AVG=35.51um refers to the thickness average value of current film profile shown by C region curve, and R=2.83% is then bent
The very poor value of statistics that line fluctuates up and down.Since film profile image has these Block Characteristics, the present invention is in computing unit
The modules of two progress image procossings of middle setting, are character extraction module and curve segmentation module respectively, the two modules the former
From root thickness value, the coordinate scale value, thickness average value for obtaining film thickness curve in image in the film profile image；The latter
These numerical value are then based on, and after extracting a continuous whole and achiasmate film thickness curve in image, on the curve
It is each, it is corresponding thickness value by its pixel coordinate conversion in the picture.
It is illustrated in figure 5 extruder die hook bolt deviations schematic diagram, wherein Fig. 5 a gives bolt physical location and exists
The case where when on the left of estimated location, the case where when Fig. 5 b gives bolt physical location on the right side of estimated location.In figure, middle part water
Flat line is the corresponding reference line of setting thickness value, and curve is the thickness curve being calculated, the triangle point of following above and
Shi Yi it not estimate and actual bolt location.BOPP film produces during slab horizontal drawing, and draw ratio is 7-9 times, for
Such as the wide volume specification of 8280mm, slab width is about 1000mm, and when diebolt is 39, each bolt corresponds to slab width
About 25mm, removes the comparatively fixed bolt in both ends, and each corresponding width in figure of adjusting bolt in middle part is essentially identical.
It can be seen that from Fig. 5 a when estimated location is to the right, estimate bolt its physical location at the place J with K in J1, K1
Place, wherein the deviation of bolt is positive value at J1, but since its estimated location is at J, will be because pressing J when carrying out thickness adjusting
Place's deviation increases aperture controlling die lips aperture and thickens, i.e., at J1 bolt the deviation of film thickness not but not reduction, and also
It will increase；Similarly, the film thickness deviation at K1 bolt will keep die lips aperture without subtracting because controlling by deviation at K
It is small.When bolt estimated location is to the left, as shown in Figure 5 b, identical problem will also occur, the film thickness of position is inclined at bolt R1, S1
Difference will further increase deviation because being controlled respectively by deviation at R, S, and the film thickness deviation of position is then and at K at bolt T
Similar, deviation will not reduce.
For this purpose, in order to enable film thickness monitoring can converge to zero-deviation without vibrating repeatedly up and down in zero-deviation, it should make
Bolt estimated location is obtained as far as possible close to physical location.The present invention passes through the specific bolt of dynamic regulation and is judged according to regulating effect
Estimated location is to the left or to the right.
As shown in Figures 6 and 7, when diebolt estimated location is to the left or to the right, film thickness regulating effect will be different.Two
In figure, X-axis indicates that deviation Reference line, straight line AB indicate the film thickness curved section between two estimations bolt location A and B, do not lose one
As property, it is assumed that A and B is symmetrical about X-axis and thickness value therebetween is linearly distributed；P point is the intersection point of AB and X-axis, to work as
Leading zero deviation point.C and D point is respectively the physical location of corresponding two bolts of estimated position A and B, i.e., by deviation at A, B into
Capable bolt is adjusted, and will be actually respectively occurring at C, D, and straight line CD moves horizontally parallel lines for straight line AB's, is wherein in Fig. 6
Move to left and to move to right in Fig. 7；M point is the intersection point of CD and X-axis.In figure, U, V and E and F, G are the distal point for assisting arrow, straight line
FG is to bolt at C, D two based on film thickness curved section new after deviation progress ratio control and regulation at A, B, the intersection point of FG and X-axis
For Q point, each vertical arrows are the change of film thickness after ratio control, dMFor the estimated bias value of bolt location, dzfFor ratio control
Front and back zero-deviation point displacement.
As shown in figure 8, the automatic bolt of the method for the present invention positions workflow are as follows:
(S1) system initialization is carried out first, sets period, threshold value；
(S2) film profile thickness curve data, the corresponding thickness value of calculated curve are acquired from calibrator；
(S3) turn S4 if existing location data, otherwise carry out initial alignment, it is after artificial opposite side, each bolt is equal
Film profile thickness value collection that is even to be distributed on curve horizontal axis, updating fastener locations set and be marked with diebolt position
It closes, turns S7 later；
(S4) then turn S5 if not the search cycle, otherwise carry out bolt retrieval, search for the positive and negative contrary sign of all thickness deviations
Adjacent bolt combination, and select the smallest group echo of the difference of wherein thickness deviation be (Mj1, Mj2) conduct spiral shell to be processed
Bolt control in the ratio of respective thickness deviation to two bolts, while recording two by adjusting unit by executing agency
The abscissa XP for the point that thickness deviation is zero between a bolt, turns S7 later；
(S5) if not the period is differentiated, then turn S6, otherwise carry out the judgement and adjusting of bolt location estimated bias, again
The zero bias retrieved between bolt (Mj1, Mj2) are not good enough, remember that its abscissa is XQ；Compare XQ and XP, if the two difference is being set
In threshold range, then turn S8；All bolts are moved to right if XQ is less than XP, otherwise move to left all bolts, update bolt positioning
Location sets and the film profile thickness value set for being marked with diebolt position, turn S7 later；
It (S6) is other periods, positioning is not dealt with, and turns S7；
(S7) it waits next period to arrive, turns S2；
(S8) positioning finishes, and terminates.
After aforementioned proportion control and regulation, extruder lip aperture changes, and the thickness of extrusion molding slab is also accordingly adjusted
It is whole, Thickness sensitivity is carried out by calibrator after slab drawn, correspondingly, the thickness information that acquisition unit obtains also constantly is brushed
Newly.The period is differentiated after the search cycle, and delay therebetween is measured according to production.Preferably, automatic bolt positioned
Cheng Zhong, the search cycle can be adjusted with the time span for differentiating the period according to the population deviation of current film thickness, and be automatically positioned
It can also be repeated according to Thickness Variation.
It is each adjustable to middle part on extruder die head for the judgement for carrying out bolt location estimated bias in conjunction with shown in Fig. 6~8
Bolt is saved, is retrieved based on current estimated location, finds nearest from thickness reference line and the positive and negative contrary sign of deviation a pair of of spiral shell
Bolt carries out ratio control to them.As shown in fig. 6, practical bolt location is on the left of estimated location, it is inclined at hypothesis A, B two in figure
Difference is equal, then after carrying out ratio controls to two bolts of C, D, at two the knots modification of thickness by respectively with A as shown in Figure 6 b,
Arrow at B two is consistent, i.e., is arrow U and V by the arrow horizontal left at A, B two.So, as fig. 6 c, practical at A to obtain
To regulated quantity will be the corresponding component as shown by arrow A in triangle MUC of location A.As shown in fig 6d, by arrow E and V
Head end moves to the subpoint of A point and D point on straight line AB respectively, obtains arrow F and G, then FG is to bolt base at C, D two
Deviation carries out new film thickness curved section after ratio control and regulation at A, B.Fig. 6 a is the complex chart of Fig. 6 b, 6c and 6d, Fig. 7 and figure
6 is similar.
As can be seen from Figures 6 and 7, the intersection point Q of FG and X-axis, position on the left of P point or right side, the position depending on M
It sets, Q and the M points of two sides in the not good enough P of former zero bias.Therefore, it in automatic bolt position fixing process, when finding that Q is on the right side of P, says
Bright original bolt estimated location is to the right, it should move to left estimated location, as shown in Figure 6；Conversely, estimated location should then be moved to right,
As shown in Figure 7.To select suitable estimated location displacement, the estimation of bolt location can be established by test experiment in advance
Deviation dMFront and back zero-deviation point displacement d is controlled with ratiozfBetween mapping table, when on-line control, first calculate and work as
Preceding dzfThen estimated bias value d is obtained by tabling look-upM。
Aforementioned proportion control, is that thickness deviation is converted to temperature compensation value, by the adjuster on die head with pulse
Mode controls the on-off of solid-state relay on computer heating control channel, to control the temperature of current diebolt.Due to metal
Expansion and contraction property, when heater conducting when slab lip gap compression, the film thickness of such slab lip can be gradually
Reduce, it is on the contrary then increase.
Be illustrated in figure 9 and adjust unit control signal schematic representation, adjust unit can by PWM wave as illustrated in fig. 9 or
The PFM wave of person as shown in figure 9b instructs.Wherein, the cycle T of PWM waveSIt remains unchanged, by changing turn-on time in a period
TONTo adjust control amount；And PFM is then held on that the time is constant, adjusts control amount by changing the size in period.As excellent
In the fabrication process PWM mode can be selected, otherwise optional PFM mode in choosing when heating frequent.
The present invention is based on the BOPP extruder die head bolt positioning methods of Thickness sensitivity to pass through preferred specific one group of bolt
Thickness proportion adjusting is carried out, and bolt estimated location is adjusted according to the variation for adjusting front and back film thickness, it can be quickly to mould
Hook bolt is accurately positioned, and output token has the film profile thickness value number of all diebolt positions to set.
In addition to this, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this field
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 can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (6)
1. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity, includes the following steps:
T1) acquisition unit obtains film profile thickness curve data from calibrator, and the corresponding thickness of curve is calculated in computing unit
Angle value simultaneously carries out bolt initial alignment, saves the data in data storage cell；
T2) sentence and know unit progress bolt retrieval, specify one group of adjacent bolt as bolt to be processed, two retrieval, record bolts
Between thickness deviation be zero point abscissa XP；Meanwhile by adjusting unit by executing agency to two bolts carry out by
The ratio control of respective thickness deviation, changes the aperture of extruder lip by adjusting bolt temperature；
T3 it) waits ratio control to complete, sentences that know the zero bias retrieved between one group of adjacent bolt again of unit not good enough, remember its cross
Coordinate is XQ；
T4) sentence and know judgement and adjusting that unit carries out bolt location estimated bias, compare XQ and XP, if the two difference is more than setting
Threshold value then continues multilevel iudge, moves to right all bolts if XQ is less than XP, otherwise moves to left all bolts, update spiral shell later
Anchoring position location sets；If both XQ and XP difference are within the set threshold range, terminate to position, output token has diebolt
The film profile thickness value set of position.
2. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity according to claim 1, feature
It is, the film profile thickness curve data are expressed with film profile image format, include respectively with difference in described image
A film thickness curve, reference axis and the auxiliary line parallel with reference axis that color indicates, and to indicate the film thickness curve
The character of root thickness value, coordinate scale value, thickness average value.
3. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity according to claim 1, feature
It is, the initial alignment sequentially includes the following steps: on each bolt uniform mapping to curve horizontal axis after opposite side by computing unit,
The film profile thickness value set for updating fastener locations set and being marked with diebolt position.
4. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity according to claim 1, feature
It is, it is further comprising the steps of: to sentence and know the adjacent bolt group that unit retrieves the positive and negative contrary sign of all thickness deviations in the search cycle
It closes, selects to combine minimum one group of interior difference as bolt to be processed.
5. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity according to claim 1, feature
It is, the adjusting unit controls the on-off of diebolt solid-state relay by executing agency with PWM mode, to pass through
The temperature of bolt is controlled to adjust the aperture of bolt place die head section, to realize the thickness tune of film section corresponding to the bolt
Section.
6. a kind of BOPP extruder die head bolt positioning method based on Thickness sensitivity according to claim 1, feature
It is, the adjusting unit controls the on-off of diebolt solid-state relay by executing agency in a manner of PFM, to pass through
The temperature of bolt is controlled to adjust the aperture of bolt place die head section, to realize the thickness tune of film section corresponding to the bolt
Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| DE102018127670A1 (en) * | 2018-11-06 | 2020-05-07 | Windmöller & Hölscher Kg | Actuating device for checking an exit thickness of a nozzle exit gap of a flat film machine |
| DE102018127671A1 (en) | 2018-11-06 | 2020-05-07 | Windmöller & Hölscher Kg | Procedure for the control of a thickness profile of a film web |
| CN113459370B (en) * | 2021-06-16 | 2022-12-16 | 广东金明精机股份有限公司 | Film stretching thickness control method |
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