SU761279A1 - Apparatus for longitudinal indexing of polymer films - Google Patents

Description

The invention relates to a device for the longitudinal orientation of polymer films, which is intended to impart heat-shrinking properties of a polymer film, for example, from fluoronone, used for lining shafts and cylinders in the pulp and paper, textile, printing industry and other industries.

A device for the longitudinal orientation of the polymer films, containing different speed rolls, free-rotating rolls, heater, clamping rolls [1] is known ..

The disadvantages of this device are that its use requires a section of a film of great length in order to cover the distance between two groups of different speed rolls, between which several clamping rolls and a heater are placed. This leads to an increase in waste at the final stage of unwinding the processed roll of an expensive film of polymer material. Moreover, the device is cumbersome, since it includes a group of three slowly rotating rolls.

No synchronization connection between the drives of both groups of different speeds2

rolls and a large distance between them makes it difficult to obtain a film with an acceptable thickness variation (no more than 5%).

5 The closest to the technical nature of the invention is a device for the longitudinal orientation of polymer films, containing axial speed and feed shafts, reels mounted on axes

About for the film, the heater and the mechanism of maintaining a constant rate of deformation of the film [2].

In the latter device, a synchronization coupling is provided between the drives of 5 different speed shafts. However, the apparatus is bulky and complicated in structure due to the presence of special shaft for mounting bobbins of film and the complexity and unreliability of the mechanism for maintaining constant soon, ₀ STI strain designed as a sensor and a regulator, which reduces the quality

film.

The purpose of the invention is to simplify the design of the device and improve the quality of the film.

This goal is achieved due to the fact that the device for the longitudinal orientation of the polymer films containing mounted on the axes of different speeds g, ""! ""

761279

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The supply and take-up rolls, film reels, a heater and a mechanism for maintaining a constant film warping speed, according to the invention, film reels are installed on the feed and receiving rollers, and the mechanism for maintaining a constant film warping speed is made in the form of two reversed tops in opposite sides of conical drums screw thread on the outer surface, interconnected by a flexible element, with one of the drums mounted on the axis of the receiving shaft, and the other is connected to the feed shaft pos kinematic transmission.

The drawing shows the proposed device, a General view.

The device for the longitudinal orientation of the polymer films contains, raznoskorostnye feed (slow-rotating) shaft 1 and receiving (fast-rotating) shaft 2, mounted respectively on axes 3 and 4. On shafts 1 and 2 are installed reels 5 and 6 for the film, and between shafts 1 and 2 placed heater, made in the form of a freely rotating shaft 7, mounted with the possibility of vertical and horizontal movement (means for moving the shaft 7 are not shown in the drawing). To maintain a constant deformation rate of the film, a mechanism is designed, made in the form of two vertices facing opposite sides of the conical drums 8 and 9 with a screw thread 10 and 11 of the reciprocal direction on the outer surface. The drums 8 and 9 are interconnected by a flexible element 12 (cable), the drum 9 is installed on the axis 4 of the receiving shaft 2, and the drum 8 is connected to axis 3 of the feed shaft 1 by means of a kinematic transmission in the form of gears 13 and 14 and with a drive sprocket 15 ( the actuator is not shown in the drawing) by means of a chain 16 and an asterisk 17. The receiving shaft 2 is mounted for movement in a horizontal plane (the moving means are not shown in the drawing).

The device works as follows.

The polymer film on the reel 5, mounted on the shaft 1, is held over the heating shaft 7 and fixed on the reel 6, on the shaft 2, and the shaft 1 is installed with the possibility of reciprocating movement in a horizontal plane in a direction parallel to its longitudinal axis, which allows Orient the film to a length of 10 m and reduce to 1% transverse shrinkage (i.e., the deformation is planar in length and thickness). The distance between the shaft 1 and 2 is selected depending on the brand of material. To regulate the length of the orientation (extension) section, the heating shaft 7 may

move in the vertical and horizontal directions, which leads to a change in the angle of coverage of its side surface with the film and, accordingly, of the heated portion of the film.

The adjustable drive provides smooth adjustment for selection of speed of movement of a film depending on its thickness. From the drive sprocket 15 with ₁₀ power chain 16 rotation is transmitted to the sprocket 17, gear 13 and the conical drum 8. Gear 13, the rotation is transmitted through gear 14 to the feed shaft 1, and using cable 12 wound on the bar ₁₅ bans 8 and 9, - receiving shaft 2. The amount of stretching of the polymer film is determined by the gear ratio of gears 13 and 14 and can practically be chosen any necessary.

₂₀ In order to ensure the constancy of the deformation rate of the film, the shafts 1 and 2 have the same outer diameter, and the drums 8 and 9 are made conical with spiral grooves mutually inverse on the board, the smallest diameter of the drums 8, 9 being equal to the outer diameter of the shafts 1, 2 drums - to diameter wound on reels 5 and 6 and shaft 1 and 2 rolls of film. Bla ₃₀ Godard This ensures stable film drawing permanency factor in the process of rewinding the shaft 1 to the shaft 2. The angle of taper of the reels 8 and 9 is determined depending on the film thickness (the larger the film thickness, the larger the taper angle).

In the process of rewinding the film from the shaft 1 to the shaft 2, the linear velocity of the film decreases. This reduction in linear velocity

_{40 of the} film is automatically compensated by a proportional decrease in the angle of coverage of the cylindrical surface of the heating shaft 7 with the film, due to which the film is heated uniformly.

₄₅ Reducing the angle of film coverage of the cylindrical surface of the shaft 7 with a decrease in the linear speed of the film also occurs automatically as a result of increasing the diameter of the roll, winding ₅₀ on the reel 6 of shaft 2, and reducing the diameter of the roll unwinding from the reel 5 of shaft 1, for a given position of the heating shaft 7 .

The proposed device is different about ₅₅ cost of construction, which reduces the cost of its manufacture and ensures the manufacture of high-quality film by maintaining the constancy of the stretching ratio.

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Claims (1)

Claim A device for the longitudinal orientation of polymeric films, containing multi-speed feed 55 and axle shafts mounted on axes, film reels, 761279 five a heater and a mechanism for maintaining a constant deformation rate of the film, characterized in that, in order to simplify the design of the device and improve the quality of the films, film reels are mounted on the feed and take-up shafts, and the mechanism for maintaining a constant film deformation rate is made in the form of two reversed tops in opposite sides of conical drums with screw cutting on the outer surface, interconnected by a flexible element, 6 moreover, one of the drums is mounted on the axis of the receiving shaft, and the other is connected to the feed shaft by means of a kinematic transmission.