CN102601976B - On-line measurement method for plastic product thickness on extruding machine - Google Patents
On-line measurement method for plastic product thickness on extruding machine Download PDFInfo
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- CN102601976B CN102601976B CN201210090056.1A CN201210090056A CN102601976B CN 102601976 B CN102601976 B CN 102601976B CN 201210090056 A CN201210090056 A CN 201210090056A CN 102601976 B CN102601976 B CN 102601976B
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- plate condenser
- extruded material
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- extruder
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- 229920003023 plastic Polymers 0.000 title claims abstract description 33
- 239000004033 plastic Substances 0.000 title claims abstract description 33
- 238000000691 measurement method Methods 0.000 title abstract 5
- 239000000463 material Substances 0.000 claims abstract description 58
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 239000011810 insulating material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000001125 extrusion Methods 0.000 description 11
- 235000012438 extruded product Nutrition 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- 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
- B29C2948/92009—Measured parameter
- B29C2948/9219—Density, e.g. per unit length or area
-
- 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
- B29C2948/92295—Errors or malfunctioning, e.g. for quality control
-
- 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
- B29C2948/92323—Location or phase of measurement
- B29C2948/92438—Conveying, transporting or storage of articles
-
- 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
- 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
- B29C2948/92685—Density, e.g. per unit length or area
-
- 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
- B29C2948/9279—Errors or malfunctioning, e.g. for quality control
-
- 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
- B29C2948/92933—Conveying, transporting or storage of articles
Abstract
The invention discloses an on-line measurement method for plastic product thickness on an extruding machine. An extruded material outlet on the extruding machine is provided with at least one plate condenser; two electrodes of the plate condenser are respectively positioned on two sides of the extruded material; when the plastic material is extruded, the capacitance value of the plate condenser is measured; and the corresponding thickness of the extruded material is determined according to the function relationship of the capacitance value and the thickness of the extruded material. The on-line measurement method utilizes the principle that the thickness variation of the extruded material between the two electrodes of the capacitor is reflected by the capacitance value variation, and the product thickness of the plastic product is evaluated by the capacitance value variation of the plate condenser on two sides of the extruded material of the extruding machine. With the measurement method, on-line measurement can be realized, a user does not need to directly contact with the plastic product, and therefore the on-line measurement method is very suitable for measuring the thickness of the film product with high requirement on the surface quality.
Description
Technical field
The present invention relates to the extruder device for plastic products, the On-line Measuring Method of plastic product thickness on especially a kind of extruder.
Background technology
Extruder is the device for processing high molecule plastic product, extrusion refers to that macromolecule (plastics) particle plastifies into uniform melt by extrusion system in barrel, and under the pressure set up in this course, by the process of screw rod continuous extruder head, the steps such as that extrusion comprises is reinforced, fusion plastification, Screw Extrusion, though it is shorter that this process is lasted, great changes will take place for the state of melt in extruder, and these variations have conclusive impact to the quality of final products.
In recent years, to the raising day by day of plastic product quality requirement, need to be by sooner and more reliable on-line measurement control method in process.In process of production, these control methods need to be recorded to the variation of various mass parameters as early as possible, in extrusion process, the technology of existing measurement extruded product quality is mainly off-line point measurement, for example the macromolecule product of producing is taken out and carries out component analysis, mechanical mechanics property experiment, thickness, density measure experiment etc.But, although these metering systems can obtain the quality results of product, if but detect problematic product, the information that need to regulate manufacturing parameter feedbacking according to these problems has been but after several hours, lag behind the control of real-time production far away, now cause already the waste of upper ton product, caused no small economic loss.
Current extruding production line On-line Measuring Method, mainly comprise these two kinds of the interior temperature of barrel and the on-line measurements of barrel internal pressure, but these all can not directly reflect the final mass of product, and the information content providing is extremely limited.Chinese patent that for example application number is 200910206586.6 " for measuring the method and apparatus of temperature of plastics of plastification in exit of extruder " discloses a kind of utilization and has treated that the sound velocity of wave propagation of extruded material measures method and the device of plastics temperature, but be only confined to online temperature or pressure test, the mass parameter such as thickness evenness, consistent in density, mixing uniformity or the crystallisation by cooling uniformity of reflection plastic product quality cannot be measured, thereby the final mass of plastic product can not be directly reflected.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of for the thickness On-line Measuring Method that the thickness of plastic product is carried out to on-line measurement on extruder.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
The On-line Measuring Method of plastic product thickness on a kind of extruder, on described extruder, extruded material exit is provided with at least one plate condenser, two electrodes of described plate condenser lay respectively at the both sides of extruded material, during the extruding of plastic material, measure the capacitance of plate condenser and determined the respective thickness of extruded material by the functional relation of capacitance and extruded material thickness.
Be further used as preferred embodiment, the capacitance of measuring described plate condenser comprises the following steps:
Capacitance plate condenser being detected through a convert of capacitor to voltage module is converted to analog voltage;
Through an analog-to-digital conversion module, described analog voltage is converted into digital quantity through analog-to-digital conversion;
Through the digital quantity of analog-to-digital conversion module output described in an acquisition module Real-time Collection;
Obtain the capacitance of plate condenser according to the linear relationship of the magnitude of voltage digital quantity collecting and magnitude of voltage and capacitance.
Be further used as preferred embodiment, the functional relation of the capacitance of described plate condenser and extruded material thickness is:
; In above formula, δ is extruded material thickness, ε
0for the dielectric constant of air, ε
rfor the dielectric constant of extruded material, S is the relative area of capacity plate antenna two electrodes, and D is the relative distance of plate condenser two electrodes, C
xfor the capacitance of plate condenser.
Be further used as preferred embodiment, this measuring method comprises the following steps:
Capacitance plate condenser being detected through a convert of capacitor to voltage module is converted to analog voltage;
Through an analog-to-digital conversion module, described analog voltage is converted into digital quantity through analog-to-digital conversion;
Through the digital quantity of analog-to-digital conversion module output described in an acquisition module Real-time Collection;
Through the digital quantity of analog-to-digital conversion module output described in an acquisition module Real-time Collection;
Functional relation between magnitude of voltage and the extruded material thickness obtaining according to the magnitude of voltage digital quantity collecting and convert of capacitor to voltage module is determined the respective thickness of extruded material.
Be further used as improvement, this measuring method also comprises the step that the digital quantity of described acquisition module collection is fed back to extruder control system.
Be further used as preferred embodiment, described plate condenser is positioned at extruder head exit on extruder, and two electrodes of described plate condenser are radially fixed on the symmetrical both sides in described extruder head exit by insulating materials.
Be further used as preferred embodiment, described plate condenser is positioned at extruder head exit on extruder, and two electrodes of described plate condenser pass through support fixed placement in symmetrical both sides radially, described extruder head exit.
Be further used as preferred embodiment, two electrodes of described plate condenser can activity adjustment position by support.
The invention has the beneficial effects as follows: the On-line Measuring Method of plastic product thickness on extruder of the present invention, utilize the principle of extruded material varied in thickness between two electrodes of plate condenser capacitance variation reflection plate condenser, the product thickness of plastic product is assessed in the variation that is positioned at the capacitance of the plate condenser of extruder extruded material both sides by measurement, this measuring method can realize on-line measurement, and do not need directly to contact with plastic product, be applicable to very much the thickness measure of the exigent film series products of Surface Quality.
Brief description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is the structure principle chart of plastic product quality on-line measurement device on extruder of the present invention;
Fig. 2 is the structural representation of measurement mechanism middle plateform capacitor of the present invention;
Fig. 3 is the position view of the measuring method embodiment middle plateform capacitor of plastic product thickness on extruder of the present invention;
Fig. 4 is the principle schematic that method for measuring thickness middle plateform capacitor electrode capacitance of the present invention is measured.
Detailed description of the invention
The On-line Measuring Method of plastic product thickness on extruder of the present invention, utilize the principle of extruded material varied in thickness between two electrodes of plate condenser capacitance variation reflection plate condenser, before measuring method of the present invention is described, first plastic product quality on-line measurement device on the concrete extruder of introducing for implementing measuring method of the present invention.
With reference to Fig. 1, plastic product quality on-line measurement device on a kind of extruder, comprise the plate condenser 10 for measuring extruded material mass parameter on extruder, two electrodes of described plate condenser are positioned at the both sides of extruded material, two electrodes of described plate condenser 10 are drawn respectively a wire 30 and are connected to a capacitance measurement unit 20, capacitance measurement unit 20 is used for the variation tendency of 10 liang of interelectrode capacitance values of Real-Time Monitoring plate condenser, the capacitance that user can collect according to capacitance measurement unit 20 is drawn out the capacitance variations curve of extruded material, for closed-loop control system provides control supplemental characteristic.
Preferably, with reference to Fig. 1, described capacitance measurement unit 20 comprises that the capacitance for described plate condenser 10 is measured is converted to the convert of capacitor to voltage module 21 of analog voltage, described capacitance voltage module 21 is connected with one analog voltage is converted to the analog-to-digital conversion module 22 of digital quantity, and described analog-to-digital conversion module 22 is connected with a continuous acquisition analog-to-digital conversion module 22 exports the acquisition module 23 of digital quantity.
With reference to Fig. 2, plate condenser 10, based on capacitance principle design, comprises two symmetrical electrodes of being made up of metallic plate 11, and when extrusion does not occur, the dielectric layer between two electrodes 11 is air 12; In the time that extrusion occurs, between two electrodes 11, comprise the dielectric layer that the extruded materials such as macromolecule melt 13 form.
In the time that extrusion occurs, with reference to Fig. 4, setting δ is extruded material thickness, the distance between top electrode and extruded material that d is plate condenser, and S is the relative area of plate condenser two electrodes, D is the relative distance of plate condenser two electrodes, C
1for the capacitance of extruded material upper space, C
2for the capacitance of extruded material, C
3for the capacitance of extruded material lower space; The capacitance of plate condenser is C
x.In the time that extrusion occurs, capacitance C
xcomputing formula be:
In above-mentioned formula 1,
for the capacitance of extruded material upper space, wherein ε
0for the dielectric constant of extruded material;
for the capacitance of extruded material, be wherein the dielectric constant of extruded material, the thickness that δ is extruded material;
for the capacitance of extruded material lower space.The thickness δ that can draw like this extruded material is:
Above-mentioned formula 2 has provided the capacitance C of plate condenser
xand the functional relation between the thickness δ of extruded material.
With reference to Fig. 3, in the preferred embodiment of the present invention, be provided with a plate condenser in the extruder head exit 41 of extruder.Extruded material causes capacitance C during by plate condenser through extruder head 43
xvariation.It will be appreciated by those skilled in the art that, the mutual electrical isolation of metallic plate of two electrodes 11 of plate condenser 10, form capacitor, therefore two electrodes 11 are fixed to the radially both sides in extruder head exit 41 by insulating materials, just can measure the variation of the capacitance of the plate condenser 10 that extruded material causes through two electrodes 11.Upper outside except two electrodes 11 of plate condenser 10 being fixed on to extruder by insulating materials, can also two electrodes 11 of plate condenser 10 be fixedly installed on by extraneous support to the relevant position of extruder, the radially both sides in routine extruder head exit 41 as be shown in the examples; Further, movable adjustment can be carried out by support in the position of two electrodes 11 of plate condenser 10, thereby adjusts the differing heights of 10 liang of interelectrode relative distances of plate condenser or adaptation extruder.
In order to realize the monitoring of the capacitance to plate condenser 10, on two electrodes 10 of plate condenser 10, draw respectively a wire 30, described wire 30 is welded on the back of electrode 10, a wire 30 extends and is connected to a utmost point of the convert of capacitor to voltage module 21 in capacitance measurement unit 20, and another root wire 30 extends and be connected to another utmost point of described convert of capacitor to voltage module 21.
Measuring method of the present invention comprises the following steps:
Analog voltage output is measured and be converted to convert of capacitor to voltage module 21 to the capacitance of described plate condenser 10, and analog voltage and the capacitance of output are linear, and the magnitude of voltage that setting convert of capacitor to voltage module 21 is exported is V
x, capacitance
, for one, concerning fixing system, in above formula, m, n are definite value, therefore the magnitude of voltage V after conversion
xwith capacitance C
xlinear;
The analog voltage receiving is converted to digital quantity by analog-to-digital conversion module 22;
Acquisition module 23 carries out Real-time Collection to described magnitude of voltage digital quantity;
Obtain the capacitance of plate condenser according to the linear relationship of the magnitude of voltage digital quantity collecting and magnitude of voltage and capacitance.
The capacitance C definite according to formula 2
xand the functional relation between the thickness δ of extruded material calculates corresponding extruded material thickness δ.
Due to the magnitude of voltage V after conversion
xwith capacitance C
xlinear, method for measuring thickness of the present invention also can be directly by magnitude of voltage V
xmeasure extruded material thickness δ, the step of this measuring method comprises:
Capacitance plate condenser being detected through a convert of capacitor to voltage module 21 is converted to analog voltage;
Through an analog-to-digital conversion module 22, described analog voltage is converted into digital quantity through analog-to-digital conversion;
The digital quantity of exporting through analog-to-digital conversion module 22 described in acquisition module 23 Real-time Collections;
According to the magnitude of voltage digital quantity collecting and magnitude of voltage V
xwith extruded material thickness C
xbetween functional relation determine the respective thickness of extruded material.
Be further used as preferred embodiment, the digital quantity of the magnitude of voltage collecting is fed back to extruder control system 50 by acquisition module 23.Preferably, capacitance measurement unit 20 adopts the fixed forms such as support to fix, and to receive the capacitance detecting from plate condenser, and the digital quantity of magnitude of voltage is fed back to extruder control system 50.
Extruder control system 50 is carried out continuous acquisition record to the magnitude of voltage digital quantity of feedback, record extrusion temperature and the pressure and other parameters of current time simultaneously, voltage-temperature and voltage-pressure and other parameters curve can be obtained, the corresponding parameter of extruded product thickness can be determined according to these curves.Control system, by presetting needed thickness value, calculates corresponding voltage value, and magnitude of voltage and preset value that actual feedback is returned compare, and affects the parameter of extruded product thickness according to parameter curve adjustment temperature and pressure etc.By such closed-loop control system, can in extrusion, automatically adjust, can effectively promote the quality of extruded product.
The On-line Measuring Method of plastic product thickness on extruder of the present invention, employing plate condenser passes the variation of the capacitance that between plate condenser electrode, region causes according to extruded material, measure the thickness of extruded material.Because the reaction speed of capacitor is fast, certainty of measurement is high, and the feature of on-line measurement, can extensive use and extruder field of plastic products.And this measuring method does not contact the feature of extruded material, can measure the thickness of the film series products that surperficial quality requirement is very high.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and the distortion that these are equal to or replacement are all included in the application's claim limited range.
Claims (4)
1. the On-line Measuring Method of plastic product thickness on an extruder, on described extruder, extruded material exit is provided with at least one plate condenser, two electrodes of described plate condenser lay respectively at the both sides of extruded material, it is characterized in that, during the extruding of plastic material, measure the capacitance of plate condenser and determined the respective thickness of extruded material by the functional relation of capacitance and extruded material thickness; This measuring method comprises the following steps:
Capacitance plate condenser being detected through a convert of capacitor to voltage module is converted to analog voltage;
Through an analog-to-digital conversion module, described analog voltage is converted into digital quantity through analog-to-digital conversion;
Through the digital quantity of analog-to-digital conversion module output described in an acquisition module Real-time Collection;
Functional relation between magnitude of voltage and the extruded material thickness obtaining according to the magnitude of voltage digital quantity collecting and convert of capacitor to voltage module is determined the respective thickness of extruded material;
The digital quantity of described acquisition module collection is fed back to extruder control system;
Described plate condenser is positioned at extruder head exit on extruder, and two electrodes of described plate condenser pass through support fixed placement in symmetrical both sides radially, described extruder head exit; Two electrodes of described plate condenser can activity adjustment position by support.
2. the On-line Measuring Method of plastic product thickness on a kind of extruder according to claim 1, is characterized in that, the capacitance of measuring described plate condenser comprises the following steps:
Capacitance plate condenser being detected through a convert of capacitor to voltage module is converted to analog voltage;
Through an analog-to-digital conversion module, described analog voltage is converted into digital quantity through analog-to-digital conversion;
Through the digital quantity of analog-to-digital conversion module output described in an acquisition module Real-time Collection;
Obtain the capacitance of plate condenser according to the linear relationship of the magnitude of voltage digital quantity collecting and magnitude of voltage and capacitance.
3. the On-line Measuring Method of plastic product thickness on a kind of extruder according to claim 1, is characterized in that: the functional relation of the capacitance of described plate condenser and extruded material thickness is:
; In above formula, δ is extruded material thickness, ε
0for the dielectric constant of air, ε
rfor the dielectric constant of extruded material, S is the relative area of capacity plate antenna two electrodes, and D is the relative distance of plate condenser two electrodes, C
xfor the capacitance of plate condenser.
4. the On-line Measuring Method of plastic product thickness on a kind of extruder according to claim 1, it is characterized in that: described plate condenser is positioned at extruder head exit on extruder, two electrodes of described plate condenser are radially fixed on the symmetrical both sides in described extruder head exit by insulating materials.
Priority Applications (1)
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|---|---|---|---|
| CN201210090056.1A CN102601976B (en) | 2012-03-30 | 2012-03-30 | On-line measurement method for plastic product thickness on extruding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210090056.1A CN102601976B (en) | 2012-03-30 | 2012-03-30 | On-line measurement method for plastic product thickness on extruding machine |
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| CN102601976B true CN102601976B (en) | 2014-09-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102992002A (en) * | 2012-10-18 | 2013-03-27 | 吴江市元通纺织品有限公司 | Alarming device for conveyer belt |
| CN105365179B (en) * | 2015-11-10 | 2017-10-31 | 广州市香港科大霍英东研究院 | A kind of injection moulding process online quality control method |
| CN109342514A (en) * | 2018-09-04 | 2019-02-15 | 东莞弗兰德通信科技有限公司 | The dielectric constant measurement method and device of dielectric plastic |
| CN111457868A (en) * | 2020-03-19 | 2020-07-28 | 绵阳人众仁科技有限公司 | Film detection method based on microwave resonance |
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| US5116554A (en) * | 1989-10-17 | 1992-05-26 | Tomi Machinery Manufacturing Co. Ltd. | Method of making a film having uniform thickness |
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| CN101322007A (en) * | 2005-10-28 | 2008-12-10 | 温德莫勒及霍尔希尔公司 | Film thickness sensor having a porous blower |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09323351A (en) * | 1996-06-05 | 1997-12-16 | Teijin Ltd | Adjustment of film thickness |
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2012
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|---|---|---|---|---|
| US5116554A (en) * | 1989-10-17 | 1992-05-26 | Tomi Machinery Manufacturing Co. Ltd. | Method of making a film having uniform thickness |
| CN101322007A (en) * | 2005-10-28 | 2008-12-10 | 温德莫勒及霍尔希尔公司 | Film thickness sensor having a porous blower |
| CN2855708Y (en) * | 2006-01-14 | 2007-01-10 | 青岛顺德塑料机械有限公司 | Equipment for prodn. of thick plastic plate |
Non-Patent Citations (3)
| Title |
|---|
| JP特开平9-323351A 1997.12.16 |
| 塑膜厚度在线检测系统的设计及应用;马玉真;《仪表技术与传感器》;20030731(第7期);第23-25页 * |
| 马玉真.塑膜厚度在线检测系统的设计及应用.《仪表技术与传感器》.2003,(第7期),第23-25页. |
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