Device for cooling of tubular film

FIELD: technological processes.

SUBSTANCE: stated invention is related to the field of plastics processing, to production of films, namely to devices for cooling of films made by extrusion through annular slot by upward blowing of tube. Technical result is achieved in device for cooling of tubular film made by extrusion through annular slot by upward blowing of tube. Device comprises extrusion head, annular sprayer for water supply to external surface of tube and facility for collection of water that flows down along tube. Besides facility for water collection is arranged in the form of bath installed on head via heat insulation ring that covers annular slot with its internal conic opening.

EFFECT: simplified technological process of film production, increased efficiency and improved quality of manufactured film.

2 dwg

 

The invention relates to the field of plastic processing, and specifically to the production of films, namely, devices for cooling the films produced by extrusion through a circular slot blown sleeves up.

Known similar devices for cooling tubular air or by using internal and external gauges, water cooled [1]. However, these devices do not provide sufficient performance and transparency of the produced film.

It is also known a device for cooling tubular directly with water by means of annular fill and ring vacuum gauge, suction water flowing down film sleeve [2]. The disadvantage of this device is that even non-refrigerated and fragile sleeve is pressed against the walls of the caliber due to the vacuum on the outside and due to the excess pressure from the inside. This cannot lead to a stable technological process due to the possibility of breakage of the sleeve. This device may be a prototype of the invention.

The essence of the invention consists in the reception of the water film flowing down the sleeve, after the ring of the fill into the tub, set on the head through the insulating ring, covering his inner tapered bore is Alzenau slit. Thus, on the one hand water never cools the head, and on the other hand, the sleeve extending from the annular slit of the head, immediately cooled on the outside by passing through a thin layer of water.

1 shows a process diagram of the proposed device in figure 2 is given a longitudinal section of the head on the ring slit.

Technological scheme of the proposed device comprises an extruder 1 (1), filter 2, head 3, bath 4, the insulating ring 5 (Fig 1, 2) PTFE or flexible asbestos friction material, which covers the annular gap 6, and the annular fill 7 (figure 1). Compressed air is supplied to the cylinder 3 through the valve 8 and channel 9.

The extruder 1 (1) polymer melt is fed through a filter 2 to the head 3 from the annular gap 6 (2) of which he comes in the form of a tubular-10 (figure 1), blown compressed air through the channel 9 (1, 2) and cooled by water from the annular fill 7 (figure 1). Next, the process continues in a known manner.

Water flowing down from the sleeve 10 (Fig 1) after the nozzle 7 gets into the tub 4, mounted on the cylinder 3 through the insulating ring 5, which is maintained at a constant level.

If any technology associated with the leakage of the sleeve 10 (Fig 1), the water from the bath 4 rushes to the head 3. To reduce the harmful effect of this faucet 8 regards hacivat counterclockwise connecting channel 9 with sewage and thereby dumping the water from the head 3.

After re-heating head 3 resume the process.

Literature

1. "The equipment for processing Plastmass" edited Zavgorodny VK, M, engineering, 1976, str-147.

2. Auth. mon. The USSR N276385.

Device for cooling the tubular film manufactured by extrusion through a circular slot blown sleeves up, which includes extrusion head, the annular nozzle for supplying water to the outer surface of the sleeve and means for receiving water flowing down the sleeve down, characterized in that the means for receiving water made in the form of baths, installed on the head through the insulating ring, covering his inner tapered bore of the annular gap.



 

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