SU1207785A1 - Device for producing sheets from polymeric materials - Google Patents

Description

2. The device according to claim 1, characterized in that it is provided with an additional capacity, the heat carrier fluid located below, first and connected to the nozzle in

The invention relates to equipment for the processing of polymeric materials, namely, devices for the continuous production of plastic.

The purpose of the invention is to improve the quality of the sheets.

FIG. 1 shows a device, side view; in fig. 2 shows section A-A in FIG. one.

The device consists of forming endless belts 1 and 2 of steel, located on the floor and tensioned on the drive drums 3 - 6. Vertical 7 and bottom 8 pressure chambers are mounted between the branches of the tapes 1 and 2, in which heat exchangers 9 are installed with pipes 10 and 11 for the supply and discharge of cold water. Sealing elements 2 are installed along the perimeter of chambers 7 and 8. In the upper chamber 7 there is a pipe in the wall 13 and an elongated pipe 14 5 and in the lower chamber 8 there is a pipe in the wall 15 and an elongated pipe 16, and the pipes 14 and 16 have intake ends located at a distance of 1-2 mm from the belts 1 and 2, the device includes the top 17 and bottom 18 tanks for heat transfer fluid and the vacuum pump 19. The pipes 13 and 16 are connected to the pipe 20 in the tank 17 by pipes the valve 2 is connected with the lower pipe 22 of the tank 17 and through the locking the taps 23 and 24 are with the lower tank 18. The upper tank 17 through the shut-off valve 25 communicates with the vacuum pump 19 and through the shut-off valve 26 with the atmosphere, and the lower tank 18 communicates with the vacuum pump 19 through the shut-off valve 27 and with the atmosphere through shut-off valve 28. The upper container 17 is mounted with the possibility of vertical movement. Drums 3 and 4

1207785

the wall of the lower chamber and the elongated nozzle of the upper chamber and a vacuum pump, the upper tank being installed with the possibility of changing its height position.

providing electric heaters 29. In chambers 7 and 8 along the belts 1 and 2, support posts 30 are installed.

The device works as follows.

The lower tank 18 is filled with coolant, the drums 3 and 4 are heated by means of electric heaters 29 to the thermoplastic billet molding temperature 31. As the drums 3 - 6 rotate in the transport direction of the blank 31, the latter is calibrated in thickness between the drums 3 and 4 and is moved by ribbons 1 and 2 between the chambers 7 and 8. After the passage of the sheet 32 between the chambers 7 and 8 include a vacuum pump-pump 19,

the shut-off valves 25, 24 and 28 are opened while the coolant from the lower tank 18 flows into the upper 17, after which the shut-off valves 24 and 28 are closed and the shut-off valve 21 is opened.

Through the pipes 14 and 15, the coolant fills the cavities of chambers 7 and 8. Through pipes 10 and 11 cold water is supplied to the heat exchangers 9 and drained. Sealing elements 12 prevent the coolant from leaking and the air penetrating through them is removed vacuum pump 19. The vacuum value is set so that the heat-transfer agent does not go off through the sealing elements 12, for example, using a vacuum gauge. The uprights 30 limit the deflection of the strips 1 and 2 in the direction of the cavities of the chambers 7 and 8. For

by contacting the coolant with the tapes, there is an intensive cooling of the sheet 32 being transported between them, which is separated from the tapes 1 and 2. At the end of the work, the stop valves 21 and 25 close and the stop valves 23, 26 and 27 open,

the coolant from chambers 7 and 8 flows into the lower tank 18. Moving the upper tank 17 vertically allows you to adjust the pressure of the coolant to the tapes I and 2 when the chambers 7 and 8 are filled.

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The use of the proposed device makes it possible to reduce the pressure in the chambers and thereby the pressure of the sealing elements, which eliminates sheet thinning in the sealing area and ensures an equal-thickness sheet.

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Editor E, Kopcha

Compiled by M, Osipova

Tehred T. Tulik Corrector T. Kolb

140/19 Circulation 640 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, -ZH-35, Raushsk nab. 4/5

.v "-" M ..- - - -

Filial ShSh Patent, g, Uzhgorod, st. Project, 4

FIG. 2

Claims (2)

1. DEVICE FOR FORMING SHEETS OF POLYMERIC MATERIALS, containing floor conveyor belts • mounted between their branches upper and lower chambers with sealing elements installed around the perimeter, connected by pipes in the housing wall with a coolant tank, characterized in that, in order to increase quality sheets, it is equipped with additional nozzles installed in the chambers, made elongated to tapes along which the support posts are located, and connected to the lid of the container for the carrier fluid by a vacuum pump, the nozzle in the wall of the upper chamber body and the elongated nozzle of the lower chamber connected to the lid of the coolant tank, and the nozzle in the wall of the lower chamber housing and the elongated nozzle in the upper chamber connected to the lower part of the same tank. A FIG. (g A 2. The device according to π. 1, characterized in that it is provided with an additional container for the coolant located below, the first and connected to a pipe in the steak of the lower chamber body and an elongated pipe of the upper chamber and a vacuum pump, the upper tank being installed with the possibility of changing the position in height.