CN102259481A - Method for determining length of film by thermally stretching film - Google Patents
Method for determining length of film by thermally stretching film Download PDFInfo
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- CN102259481A CN102259481A CN2011101474957A CN201110147495A CN102259481A CN 102259481 A CN102259481 A CN 102259481A CN 2011101474957 A CN2011101474957 A CN 2011101474957A CN 201110147495 A CN201110147495 A CN 201110147495A CN 102259481 A CN102259481 A CN 102259481A
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Abstract
The invention relates to a method for determining the length of a film by thermally stretching the film, which is characterized by comprising the following steps of: (1) heating the film by using a heating device in the process of conveying the film; and (2) applying tension along the advancing direction of the film to the film at the two ends of the heating device to stretch the film so as to make the film meet the predetermined length requirement. The film is heated when advancing, and the tension is applied to the heated film at the two ends of the heating device, so that the film accurately reaches the predetermined stretched length, and the film is not deformed; a first pulling roller and a second pulling roller are arranged to convey the film, and the tension applied to the film is formed by the pulling speed difference of the two pulling rollers, so that the tension applied to the two ends of the film is more uniform, the film is prevented from being broken, the stretching effect is better, and the film has a simple structure; and a closed loop control mechanism, an actual length checking mechanism and a tension fine adjustment mechanism are further arranged, so that the length of the stretched film is more accurately determined.
Description
Technical field
The present invention relates to a kind of processing method of film, relate in particular to the flexible fixed length method of a kind of film heat.
Background technology
No matter be printing of line location or the printing of off-line location, the equidistant problem of the repeat length of colour code in the time of all need solving the secondary chromatography, by the secondary printing, the pattern that makes new printing and original pattern have accurate chromatography and concern and must adopt stretching fixed length technology to guarantee the chromatography accuracy on the film of the existing pattern of printing.
At present, generally adopt on production equipment for the method for film stretching fixed length and to shut down, measure the length of every edition film then, after reach the length of every edition film of control again by parameters such as adjustment of tonicity pressure and temps.Because tension force, pressure, temperature adjustment in the production process; and many reasons such as unexpected acceleration of drive motors, deceleration, shutdown; cause deformation of thin membrane; length behind the film stretching is difficult to reach consistent with every edition length of being scheduled to; in the time of can't guaranteeing the secondary printing; the accuracy of pattern chromatography causes bigger loss etc. for the location printing.
Summary of the invention
The technical problem to be solved in the present invention provides the flexible fixed length method of a kind of film heat, and the flexible fixed length method of this film heat can guarantee that film is indeformable, and can accurately film stretching be arrived predetermined length.The technical scheme that adopts is as follows:
The flexible fixed length method of a kind of film heat is characterized in that, comprises the steps:
(1) in the course of conveying of film, adopt heater that film is heated;
(2) at the two ends of heater film is applied the tension force along the film direct of travel, film is stretched, make the length of film reach predetermined requirement.
Above-mentioned heater can be baking oven or warm-up mill.Heater is under the situation of baking oven, and many heating drive rolls also should be set in the baking oven, is used for supporting and transmitting film.
As preferred version of the present invention, it is characterized in that: in the place ahead of heater with the rear is provided with first carry-over pinch rolls respectively and second carry-over pinch rolls come handle thin films, the hauling speed of second carry-over pinch rolls is greater than the hauling speed of first carry-over pinch rolls, and the hauling speed difference of second carry-over pinch rolls and first carry-over pinch rolls forms the tension force to film.Generally speaking, first carry-over pinch rolls and second carry-over pinch rolls constitute by a drive roll and a driven voller, and drive roll and drive motors are in transmission connection, and by the rotating speed of control drive motors, and then reach the hauling speed of controlling first carry-over pinch rolls and second carry-over pinch rolls.Usually, the hauling speed of second carry-over pinch rolls is fixed, and by regulating the hauling speed of first carry-over pinch rolls, adjusts the tension force that is applied between the film two ends and reach.Match by first carry-over pinch rolls and second carry-over pinch rolls, its both speed difference forms the tension force to film, makes that like this tension force that is applied to the film two ends is more even, prevents the fracture of film, and drawing effect is better, and simple in structure.
As the further preferred version of the present invention, it is characterized in that: described first carry-over pinch rolls adopt closed-loop control to carry out hauling speed control; Closed-loop control is included in the second carry-over pinch rolls rear and measuring roller and photocell eye are set come the MEASUREMENTS OF THIN length after the stretching between adjacent two home blocks in back that stretches, the pre-set length a reference value relatively in back length and the control system of should stretching, draw a stretching margin of error, if this stretching margin of error is in the error range that allows, the hauling speed of then keeping first carry-over pinch rolls is constant, if this stretching margin of error exceeds the error range of permission, then adopt this stretching margin of error as control signal, adjust the hauling speed of first carry-over pinch rolls.Photocell eye reads the time of being located at adjacent two home blocks on the film, cooperates the pulse frequency and the pulse width of the drive motors of measuring roller, calculates on the rear film that is stretched length after the stretching between adjacent two home blocks.By length after the stretching between adjacent two home blocks on the measurement stretched film, compare with the pre-set length a reference value again, draw the stretching margin of error, judge whether this stretching margin of error exceeds the error range of permission, if exceed the error range of permission, then adopt this stretching margin of error as control signal, control the rotating speed of the drive motors of first carry-over pinch rolls, thereby adjust the hauling speed of first carry-over pinch rolls, realize regulating the tension force that is applied between the film two ends, suitably increase or reduce the amount of tension of film, make it in constantly adjusting, to reach requirement (being that the above-mentioned stretching margin of error drops in the error range of permission).
In actual production, stain appears on the film, the photocell eye mistake stain as home block and read error signal is inevitable, at this moment, length is incorrect (general than reality little) after the stretching of measuring according to photocell eye and measuring roller, with this incorrect stretching back length relatively with the pre-set length a reference value, the stretching margin of error that draws obviously can not be as the control signal of control first carry-over pinch rolls, because can cause the hauling speed of first carry-over pinch rolls to increase suddenly like this, cause the tension force deficiency, the tension force deficiency, the air capacity of bringing thin layer into is too much, film produces axial slip and serious dislocation easily on deflector roll, so that cause uncontrollable.For fear of causing control chaotic,, it is characterized in that: also comprise the physical length verification scheme as the present invention's preferred version further because of photocell eye reads stain as the home block mistake; The physical length verification scheme comprises that employing first carry-over pinch rolls cooperate photocell eye to measure the preceding length of stretching between adjacent two home blocks on the preceding film of stretching, length compares with the back length that stretches before will stretching, draw the amount of tension of film, again with amount of tension and the default amount of tension a reference value comparison of control system, draw the amount of tension error amount, if this amount of tension error amount drops in the scope of allowable error, judge that then the back length that stretches is normal, if this amount of tension error amount exceeds the scope of allowable error, judge that then the back length that stretches is unusual, and warning reminding.When the photocell eye mistake reads the stain on the film as home block, the length and the back length that stretches all reduce before stretching, the amount of tension that both relatively draw reduces equally, with it and default amount of tension a reference value relatively, just can judge the stretching that measuring roller and photocell eye measure after length whether normal.
As the present invention's preferred version further again, it is characterized in that: between the heater and second carry-over pinch rolls, adopt the tension force micro-adjusting mechanism that the tension force of film is finely tuned; The tension force micro-adjusting mechanism comprises dynamometry roller and the floating roller that is successively set between the heater and second carry-over pinch rolls; The dynamometry roller is surveyed the actual tension of film, the default tension force a reference value of actual tension and control system compares, draw the tension error value, with the control signal of tension error value as floating roller, the floating roller of control moves, adjust the relative position between floating roller and the heater, the tension force that is applied to the film two ends is finely tuned.Be typically provided with accurate sensor on the dynamometry roller, by the tension force of sensor real-time detection film; Be typically provided with potentiometer on the floating roller, the position of the floating roller of potential value representative by changing the potential value of potentiometer on the floating roller, just can make floating roller move, thereby adjust the relative position between floating roller and the heater, and the tension force that is applied to the film two ends is finely tuned.
Through the film of heating, its surface tends to produce defectives such as fold, in order to ensure the fineness of film, as preferred version of the present invention, it is characterized in that: adopt ironing roller that film is plated between the heater and second carry-over pinch rolls.
Further processing or collection for the ease of stretched film as preferred version of the present invention, is characterized in that: adopt cooling device that film is carried out cooling and shaping at the second carry-over pinch rolls rear.
In order to save the typing effect of manufacturing cost and raising film, as the further preferred version of the present invention, it is characterized in that: second carry-over pinch rolls are set to chill roll.Second carry-over pinch rolls are set to chill roll, save manufacturing cost on the one hand, and the drive roll of second carry-over pinch rolls and driven voller are laminated on the other hand, more help the typing of film.
As preferred version of the present invention, it is characterized in that: described heater is 30-180 ℃ to the temperature range of film heating.Through long-term practice and research, temperature range is the 30-180 ℃ of stretching of suitable film.Temperature is lower than 30 ℃, reaches predetermined length in order to make film, then need apply bigger tension force at the film two ends, overtension, and the stretching of film is inhomogeneous, and easy deformation, fracture; Temperature is higher than 180 ℃, and film bubbles easily, is out of shape, and is difficult to guarantee the flatness and the fineness of film surface.
As preferred version of the present invention, it is characterized in that: the scope of described tension force is 0.1-150N.Under the temperature condition with higher of film, apply a very little tension force at the film two ends and just can make film reach predetermined length requirement; Under the situation of or the big length that needs to stretch lower in the temperature of film, need apply bigger tension force at the film two ends just can make film reach predetermined length requirement, but the tension force that applies is too big, can cause deformation of thin membrane, fracture etc., through repetition test, the tension force that is applied to the film two ends is preferably between 0.1-150N.
The flexible fixed length method of film heat of the present invention is applicable to line production and off-line production, under the situation that off-line is produced, also comprises and adopts unwinding device and wrap-up, is convenient to putting film and receiving film of rolling film.
The present invention heats film by in film is advanced, and at the two ends of heater heated film is applied a tension force, makes film accurately reach predetermined tensile elongation, and guarantees that film is indeformable.By first carry-over pinch rolls being set and second carry-over pinch rolls come handle thin films, its both hauling speed difference forms the tension force to film, makes that like this tension force that is applied to the film two ends is more even, prevents the fracture of film, and drawing effect is better, and simple in structure.Further carry out closed-loop control by the hauling speed to first carry-over pinch rolls, the hauling speed of regulating first carry-over pinch rolls automatically makes that the fixed length of film is more accurate.By the physical length verification scheme is set, judge the stretching that measuring roller and photocell eye measure after length whether normal, prevent that control is chaotic.By between the heater and second carry-over pinch rolls, the tension force micro-adjusting mechanism being set the tension force of film is finely tuned, make more accurate the fixed length of film.
Description of drawings
Accompanying drawing is the structural representation of the device that adopts in the preferred embodiment for the present invention.
The specific embodiment
Be described further below in conjunction with accompanying drawing and preferred implementation of the present invention.
Embodiment one
For adopt better the flexible fixed length method of film of the present invention heat to film stretch, fixed length, adopt as shown in drawings the flexible length control device of film heat, this device comprises: unwinding device 1, wrap-up 2, heater 3, be arranged at backing roll 5, control system, first carry-over pinch rolls 6, second carry-over pinch rolls 7, measuring roller 8, photocell eye 9, tension force micro-adjusting mechanism and ironing roller 10 on film 4 direct of travels; First carry-over pinch rolls 6 are located at the place ahead of heater 3, and second carry-over pinch rolls 7 are located at the rear of heater 3; The drive motors of first carry-over pinch rolls 6 and second carry-over pinch rolls 7 is electrically connected with control system respectively; Unwinding device 1 is located at first carry-over pinch rolls, 6 the place aheads, and wrap-up 2 is located at second carry-over pinch rolls, 7 rears; Measuring roller 8 and photocell eye 9 are arranged on second carry-over pinch rolls, 7 rears, and the drive motors of measuring roller 8 and photocell eye 9 are electrically connected with control system respectively; Photocell eye 9 is corresponding with measuring roller 8 positions; Ironing roller 10 is arranged between the heater 3 and second carry-over pinch rolls 7; The tension force micro-adjusting mechanism is arranged between the heater 3 and second carry-over pinch rolls 7, and the tension force micro-adjusting mechanism comprises dynamometry roller 11 and the floating roller 12 that is successively set between the heater 3 and second carry-over pinch rolls 7; Heater 3 comprises baking oven 31 and many heating drive rolls 32 that are installed in the baking oven 31.(do not draw in the accompanying drawing control system and drive motors, omitting these two parts does not influence description of the invention, but makes accompanying drawing more succinct, more can know and express technical problem to be solved by this invention.)
As shown in drawings, the flexible fixed length method of this film heat comprises the steps:
(1) unwinding device 1, first carry-over pinch rolls 6, second carry-over pinch rolls 7 and wrap-up 2 are realized the conveying of film 4, in the course of conveying of film 4, adopt baking oven 31 that film 4 is heated to 30 ℃;
The hauling speed of (2) second carry-over pinch rolls 7 is greater than the hauling speed of first carry-over pinch rolls 6, both hauling speeds are poor, two ends at baking oven 31 apply the tension force along film 4 direct of travels to film 4, the size of tension force is 150N, film 4 is stretched, make the length of film 4 reach predetermined requirement.
In order to make the film fixed length more accurate, in the flexible fixed length method of above-mentioned film heat, first carry-over pinch rolls 6 adopt closed-loop control to carry out hauling speed control; Closed-loop control is included in second carry-over pinch rolls, 7 rears and measuring roller 8 and photocell eye 9 are set come MEASUREMENTS OF THIN 4 length after the stretching between adjacent two home blocks in back that stretches, the pre-set length a reference value relatively in back length and the control system of should stretching, draw a stretching margin of error, if this stretching margin of error is in the error range that allows, the hauling speed of then keeping first carry-over pinch rolls 6 is constant, if this stretching margin of error exceeds the error range of permission, then adopt this stretching margin of error as control signal, adjust the hauling speed of first carry-over pinch rolls 6.
For fear of causing control chaotic, in the flexible fixed length method of above-mentioned film heat, also adopt the physical length verification scheme because of photocell eye reads stain as the home block mistake; The physical length verification scheme comprises that employing first carry-over pinch rolls 6 cooperate photocell eyes 9 to measure the preceding length of stretching between adjacent two home blocks on the preceding film 4 of stretching, length compares with the back length that stretches before will stretching, draw the amount of tension of film 4, again with amount of tension and the default amount of tension a reference value comparison of control system, draw the amount of tension error amount, if this amount of tension error amount drops in the scope of allowable error, judge that then the back length that stretches is normal, if this amount of tension error amount exceeds the scope of allowable error, judge that then the back length that stretches is unusual, and warning reminding.
In order to make the film fixed length more accurate, in the flexible fixed length method of above-mentioned film heat, between the heater 3 and second carry-over pinch rolls 7, adopt the tension force micro-adjusting mechanism that the tension force of film is finely tuned; The tension force micro-adjusting mechanism comprises dynamometry roller 11 and the floating roller 12 that is successively set between the heater 3 and second carry-over pinch rolls 7; Dynamometry roller 11 is surveyed the actual tension of film 4, the default tension force a reference value of actual tension and control system compares, draw the tension error value, with the control signal of tension error value as floating roller 12, the floating roller 12 of control moves, adjust the relative position between floating roller 12 and the heater 3, the tension force that is applied to film 4 two ends is finely tuned.
In order to ensure the fineness of film, in the flexible fixed length method of above-mentioned film heat, plate by 10 pairs of films 4 of ironing roller.
In order to make after the film stretching fixed length cooling and shaping fast, in the flexible fixed length method of above-mentioned film heat, second carry-over pinch rolls 7 are set to chill roll, film 4 is carried out cooling and shaping.
Embodiment two
Under all identical with embodiment one situation of other parts, its difference is: in the step (1), baking oven 31 is heated to 180 ℃ with film 4; In the step (2), the tension force size that first carry-over pinch rolls 6 and 7 pairs of films 4 of second carry-over pinch rolls apply is 0.1N.
Embodiment two
Under all identical with embodiment one situation of other parts, its difference is: in the step (1), baking oven 31 is heated to 105 ℃ with film 4; In the step (2), the tension force size that first carry-over pinch rolls 6 and 7 pairs of films 4 of second carry-over pinch rolls apply is 75N.
In other embodiments, baking oven can replace with many warm-up mills.
In other embodiments, can chill roll be set at the second carry-over pinch rolls rear cools off film.
Claims (10)
1. the flexible fixed length method of film heat is characterized in that, comprises the steps:
⑴ adopt heater that film is heated in the course of conveying of film;
⑵ apply the tension force along the film direct of travel at the two ends of heater to film, and film is stretched, and makes the length of film reach predetermined requirement.
2. the flexible fixed length method of film heat as claimed in claim 1, it is characterized in that: in the place ahead of heater with the rear is provided with first carry-over pinch rolls respectively and second carry-over pinch rolls come handle thin films, the hauling speed of second carry-over pinch rolls is greater than the hauling speed of first carry-over pinch rolls, and the hauling speed difference of second carry-over pinch rolls and first carry-over pinch rolls forms the tension force to film.
3. the flexible fixed length method of film heat as claimed in claim 2 is characterized in that: described first carry-over pinch rolls adopt closed-loop control to carry out hauling speed control; Closed-loop control is included in the second carry-over pinch rolls rear and measuring roller and photocell eye are set come the MEASUREMENTS OF THIN length after the stretching between adjacent two home blocks in back that stretches, the pre-set length a reference value relatively in back length and the control system of should stretching, draw a stretching margin of error, if this stretching margin of error is in the error range that allows, the hauling speed of then keeping first carry-over pinch rolls is constant, if this stretching margin of error exceeds the error range of permission, then adopt this stretching margin of error as control signal, adjust the hauling speed of first carry-over pinch rolls.
4. the flexible fixed length method of film heat as claimed in claim 3 is characterized in that: also comprise the physical length verification scheme; The physical length verification scheme comprises that employing first carry-over pinch rolls cooperate photocell eye to measure the preceding length of stretching between adjacent two home blocks on the preceding film of stretching, length compares with the back length that stretches before will stretching, draw the amount of tension of film, again with amount of tension and the default amount of tension a reference value comparison of control system, draw the amount of tension error amount, if this amount of tension error amount drops in the scope of allowable error, judge that then the back length that stretches is normal, if this amount of tension error amount exceeds the scope of allowable error, judge that then the back length that stretches is unusual, and warning reminding.
5. the flexible fixed length method of film heat as claimed in claim 4 is characterized in that: adopt the tension force micro-adjusting mechanism that the tension force of film is finely tuned between the heater and second carry-over pinch rolls; The tension force micro-adjusting mechanism comprises dynamometry roller and the floating roller that is successively set between the heater and second carry-over pinch rolls; The dynamometry roller is surveyed the actual tension of film, the default tension force a reference value of actual tension and control system compares, draw the tension error value, with the control signal of tension error value as floating roller, the floating roller of control moves, adjust the relative position between floating roller and the heater, the tension force that is applied to the film two ends is finely tuned.
6. as the flexible fixed length method of each described film heat of claim 2-5, it is characterized in that: between the heater and second carry-over pinch rolls, adopt ironing roller that film is plated.
7. as the flexible fixed length method of each described film heat of claim 2-5, it is characterized in that: adopt cooling device that film is carried out cooling and shaping at the second carry-over pinch rolls rear.
8. the flexible fixed length method of film heat as claimed in claim 7, it is characterized in that: second carry-over pinch rolls are set to chill roll.
9. as the flexible fixed length method of each described film heat of claim 1-5, it is characterized in that: described heater is 30-180 ℃ to the temperature range of film heating.
10. as the flexible fixed length method of each described film heat of claim 1-5, the scope that it is characterized in that described tension force is 0.1-150N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110147495 CN102259481B (en) | 2011-06-02 | 2011-06-02 | Method for determining length of film by thermally stretching film |
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|---|---|---|---|
| CN 201110147495 CN102259481B (en) | 2011-06-02 | 2011-06-02 | Method for determining length of film by thermally stretching film |
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| CN102259481B CN102259481B (en) | 2013-07-03 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103407286A (en) * | 2013-07-24 | 2013-11-27 | 广东天安新材料股份有限公司 | Plastic membrane printing machine |
| CN104229518A (en) * | 2014-08-22 | 2014-12-24 | 安庆市兴丰工贸有限公司 | Control method for friction coiling of frequency-converting film-blowing machine |
| CN106979892A (en) * | 2017-05-03 | 2017-07-25 | 江苏新安电器有限公司 | A kind of assay method of film extensibility around film packing machine |
| CN108340659A (en) * | 2018-03-02 | 2018-07-31 | 温州瑞驰机械有限公司 | Around film to version component under stretched film |
| CN108638648A (en) * | 2018-07-10 | 2018-10-12 | 佛山市百晟装饰科技有限公司 | A kind of pair puts double receipts six-color printing press and its printing process |
| WO2021243950A1 (en) * | 2020-06-01 | 2021-12-09 | 苏州苏大维格科技集团股份有限公司 | Thin film processing system and method |
| CN114746225A (en) * | 2019-11-29 | 2022-07-12 | 川崎重工业株式会社 | Holding device, robot, and robot system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103407286A (en) * | 2013-07-24 | 2013-11-27 | 广东天安新材料股份有限公司 | Plastic membrane printing machine |
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| CN108638648A (en) * | 2018-07-10 | 2018-10-12 | 佛山市百晟装饰科技有限公司 | A kind of pair puts double receipts six-color printing press and its printing process |
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| CN114746225B (en) * | 2019-11-29 | 2024-01-02 | 川崎重工业株式会社 | Holding device, robot, and robot system |
| WO2021243950A1 (en) * | 2020-06-01 | 2021-12-09 | 苏州苏大维格科技集团股份有限公司 | Thin film processing system and method |
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| CN102259481B (en) | 2013-07-03 |
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