Automatic control method for thickness of calendered film

Abstract

The invention discloses an automatic control method for the thickness of a calendered film. The automatic control method comprises the following steps that when a detection device finds that the thickness is about to exceed a tolerance range or is unqualified, feedback is immediately performed through a feedback device, parameters to be adjusted are calculated and input into a calender adjusting system, and the adjusting system achieves specific adjusting work, so that the the calendered film with the thickness meeting the requirement is obtained. Specifically, when the detection device findsthat the thickness is about to exceed the tolerance range or is unqualified, a real-time thickness value is immediately transmitted to a curve fitting algorithm through the feedback device, judgment is made according to a comparison result of the measured thickness value and a target value input in advance, and whether the value is within the tolerance range or not is judged. According to the control method, manual measurement is not needed, and software control is rapid and accurate; and then three automatic thickness control methods are provided, so that the thickness control manner is flexible.

Description

technical field

[0001] The invention relates to a device for automatically adjusting the thickness of a calendered film, belonging to the field of film production. Background technique

[0002] In recent years, with the rapid development of the national economy, the demand for plastic film products has continued to rise, and the plastic extrusion industry has developed rapidly. In the production process of plastic film, thickness control is one of the key steps, and the accuracy of film thickness control is directly related to the quality of finished products. Foreign scholars have carried out decades of research on plastic film thickness control technology, with remarkable results and mature technology. The more famous ones are BRUECKNER in Germany, Mitsubishi in Japan, and TMD in France. At present, the domestic film thickness control system mainly adopts traditional PID control, and the PID parameters still rely on operators to manually "try and figure out" based on thei...

Examples

Embodiment 1

[0044] To produce a film with a calendered thickness of 0.500mm, the steps are as follows:

[0045] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0046] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0047] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0048] 4) Put the strip between the calender rollers, set the gap between the calender rollers to 0.620 mm according to production experience, and start the calender. The thickness of the film measured by the thickness gauge at the exit is 0.550mm, which is different from the target thickness of 0.500mm, and the difference is 0.050mm. The software automatically sets the adjustment option of the calender adjustment system to "gap adjustment". Then the software is based on the following form...

Embodiment 2

[0056]To produce a film with a calendered thickness of 0.475mm, the steps are as follows:

[0057] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0058] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0059] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0060] 4) Insert the strip between the calendering rollers, set the gap between the calendering rollers to 0.570mm according to production experience, then manually set an inlet strip tension of 62mmkg, and start the calendering machine. The thickness of the film measured by the thickness gauge at the exit is 0.485mm, which is different from the target thickness of 0.475mm, and the difference is 0.010mm. The software automatically sets the adjustment option of the calender adjustment system ...

Embodiment 3

[0068] To produce a film with a calendered thickness of 0.430mm, the steps are as follows:

[0069] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0070] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0071] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0072] 4) Put the strip between the calender rollers, set the gap between the calender rollers to 0.495 mm according to production experience, then manually set a line speed of 4.1 m / min, and start the calender. The thickness of the film measured by the thickness gauge at the exit is 0.435mm, which is different from the target thickness of 0.430mm, and the difference is 0.005mm. The software automatically sets the adjustment option of the calender adjustment system to "speed adjustment". T...

technical field

[0001] The invention relates to a device for automatically adjusting the thickness of a calendered film, belonging to the field of film production. Background technique

[0002] In recent years, with the rapid development of the national economy, the demand for plastic film products has continued to rise, and the plastic extrusion industry has developed rapidly. In the production process of plastic film, thickness control is one of the key steps, and the accuracy of film thickness control is directly related to the quality of finished products. Foreign scholars have carried out decades of research on plastic film thickness control technology, with remarkable results and mature technology. The more famous ones are BRUECKNER in Germany, Mitsubishi in Japan, and TMD in France. At present, the domestic film thickness control system mainly adopts traditional PID control, and the PID parameters still rely on operators to manually "try and figure out" based on thei...

Examples

Embodiment 1

[0044] To produce a film with a calendered thickness of 0.500mm, the steps are as follows:

[0045] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0046] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0047] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0048] 4) Put the strip between the calender rollers, set the gap between the calender rollers to 0.620 mm according to production experience, and start the calender. The thickness of the film measured by the thickness gauge at the exit is 0.550mm, which is different from the target thickness of 0.500mm, and the difference is 0.050mm. The software automatically sets the adjustment option of the calender adjustment system to "gap adjustment". Then the software is based on the following form...

Embodiment 2

[0056]To produce a film with a calendered thickness of 0.475mm, the steps are as follows:

[0057] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0058] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0059] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0060] 4) Insert the strip between the calendering rollers, set the gap between the calendering rollers to 0.570mm according to production experience, then manually set an inlet strip tension of 62mmkg, and start the calendering machine. The thickness of the film measured by the thickness gauge at the exit is 0.485mm, which is different from the target thickness of 0.475mm, and the difference is 0.010mm. The software automatically sets the adjustment option of the calender adjustment system ...

Embodiment 3

[0068] To produce a film with a calendered thickness of 0.430mm, the steps are as follows:

[0069] 1) Select the appropriate resin according to the needs, mix it with solvent oil, and put it in the oven for curing for a period of time;

[0070] 2) Add the mixture into the barrel of the pre-pressing machine, and pre-press it into a rod-shaped blank;

[0071] 3) Put the billet into the pushing equipment, and extrude a strip with a thickness of 1.5mm through the die by the pushing machine;

[0072] 4) Put the strip between the calender rollers, set the gap between the calender rollers to 0.495 mm according to production experience, then manually set a line speed of 4.1 m / min, and start the calender. The thickness of the film measured by the thickness gauge at the exit is 0.435mm, which is different from the target thickness of 0.430mm, and the difference is 0.005mm. The software automatically sets the adjustment option of the calender adjustment system to "speed adjustment". T...

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