RU1812125C - Plant for biaxial orientation of polymeric films - Google Patents

Abstract

Usage: obtaining polymer biaxially oriented films in the chemical industry. SUMMARY OF THE INVENTION: The apparatus comprises a longitudinal orientation device with fast-rotating clamping rolls. They are connected to a rotation drive. The staple chains of the lateral orientation device are connected to the movement drive. The installation is equipped with an additional group of clamping rolls. They are located between the means for synchronizing the speeds of the longitudinal and lateral orientation devices and the lateral orientation device. One of the rolls of the additional group is equipped with a mechanism for turning it on after the unit has entered the operating mode. A second roll of a further group is coupled to a rotation drive. 1 s.p. f-ly, 1 ill.

Description

The invention relates to plastic processing equipment and can be used in roll type devices for longitudinal orientation and a screw type for transverse orientation or heat treatment of films and sheets of polymeric materials, for example, such as polyethylene terephthalate, polypropylene, polystyrene, etc. used as the basis of magnetic tapes, electrical insulating capacitor films.

The purpose of the invention is to improve the quality of the film by eliminating the perturbing effect on the rotation drive of the clamping rapidly rotating rollers.

This solution allows to eliminate the disturbing force of the drive of the device of lateral orientation on the drives of the device of longitudinal orientation, which provides high-quality polymer films of various thicknesses for

due to the introduction between the devices of a group of shut-off, actively damping clamping rolls with an electric drive operating in both motor and braking modes.

The drawing schematically shows an installation for biaxial orientation of polymer films, General view.

The installation for biaxial orientation of polymer films comprises a longitudinal orientation device 1 with a group of fast-rotating clamping rolls 2 connected to a rotation drive 3 and a control system 4 of the drive. At the input of the device, after the rolls 2, a swing type compensator is installed, made in the form of a freely rotating roll 5, on the swing axis 6 of which an angular displacement sensor (selsyn) is rigidly mounted (not shown conventionally in the drawing). Between compensator 5 and lateral orientation device 7

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an additional group of clamping rolls 8 and 9 is installed, and the roll 8 is connected to the rotation drive 10 and the drive control system 11 in both motor and brake operating modes, and the roll 9 is equipped with a mechanism for its inclusion, made in the form of pneumatic cylinders 12 for input and output of the roll out of contact with the upper roll 8.

At the input of the lateral orientation device 7, a free-rotating guide roll 13 is installed, which is installed in the plane of the film web by the closures 14 of the chains associated with the drive 15 along the functional areas of the device.

The drive for moving the stub chains is controlled by a control system 16, which is connected to an angular displacement sensor of the compensator 5, which is a means of synchronizing the speeds of orientation devices.

Installation works as follows.

The starting polymer film 17 is fed into a longitudinal orientation device 1, where it is elongated in the longitudinal direction.

After the device 1, by means of a group of fast-rotating clamping rollers 2, a longitudinally oriented film is fed through the compensator roller 5 and an additional group of clamping rollers 8 and 9 to the lateral orientation device 7, where it is sequentially transported through functional zones using two endless branches of stub chains 14 stretched in the transverse direction.

After the device 7, the biaxially oriented film web, after trimming the thickened edges and measuring its thickness difference, is directed to winding into finished rolls.

In the process of orientation, a longitudinally oriented film with a linear speed specified by the drive 3 of the rolls 2 continuously enters the roll 5 of the compensator, whose angle of deviation from the middle position to one side or the other (up or down), synchro (not shown) mounted on axis 6 swing, generates a signal acting through the control system 16, respectively, to lower or increase the linear speed of the drive 15 to move the dummy chains 14 of the lateral orientation device 7. The rolls 8

and 9 by means of pneumatic cylinders 10 are in contact with each other and clamp the film web, and their linear speed is determined by the speed of the roll 8 connected to the rotation drive 10, manually controlled from an individual console through the control system 11, which provides blanking and active damping introduced by drives 3 and 15 through the film,

disturbing force effects between devices 1 and 7 and obtaining high-quality film. In this case, the film tension is minimal between the rollers 2 and 8, 9, it is determined by the weight of the roller 5, which is necessary for a certain position of the angular displacement sensor (synchro), and in the region between the rollers 8, 9 and the dummy chains 14, it is required for stable and reliable film tension tensioning.

 Depending on the thickness and speed of the passing film, the roll drive 10 operates in either braking (for thick films) or motor (for thin films) operating modes.

The use of the invention will allow to increase the yield of the film by 2-5% by eliminating the disturbing effect on the rotation drive of the fast-rotating clamping rolls of the device

Claims (2)

1. Installation for biaxial orientation of polymer films, comprising a longitudinal orientation device with groups of fast-rotating clamping rolls connected to a rotation drive, a lateral orientation device with screw chains connected to the movement drive, and means for synchronizing the speeds of the longitudinal and lateral orientation devices, different from the fact that, in order to improve the quality of the film by eliminating the disturbing effects on the drive clamping fast-rotating rolls, the installation is equipped with an additional group of clamping rolls located in the area between the synchronization means and the lateral orientation device, one of the rolls of an additional group is connected to a rotation drive. 2. The installation according to claim 1, with the proviso that the opposite to the first roll of the additional group is equipped with a mechanism for bringing it into contact with the first roll after the installation enters the operating mode.