US 2023/0241531 A1Published application

Cleaning gases from the degassing of polymer melts

AssigneeBaratti GmbH

InventorGerhard BARATTI

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Abstract

A method and a device for the purification of gases from the degassing of polymer melts—in particular, for the continuous further processing to form stretched polymer films. In this case, the gas to be purified is fed from a vacuum zone of a plasticizing unit, via at least one vacuum or degassing line, to a vacuum separator with a gas inlet and a gas outlet in which condensible, separable by freezing, and/or re-sublimable substances are separated from the supplied and purified gas by means of a cooling arrangement, and the separated substances are removed from the vacuum separator. By means of a heating arrangement, the substances separated by means of the cooling arrangement are at least partially liquefied or softened in the vacuum separator and removed from the vacuum separator in particular by suction.

Claims18

Dependent claims

Method for purifying gases from the degassing of polymer melts—in particular, for continuous further processing to form stretched polymer films—having the following features:

from a vacuum zone of a plasticizing unit, the gas to be purified is fed, via at least one vacuum or degassing line, to a vacuum separator with a gas inlet and a gas outlet,
in which condensible, separable by freezing, and/or re-sublimable substances from the fed and purified gas are separated by means of a cooling arrangement, and the separated substances are removed from the vacuum separator,
wherein
the separation of the substances from the gas to be purified in the vacuum separator takes place by means of freezing-out by cooling the substances to be separated by means of the cooling arrangement,
the substances separated by means of the cooling arrangement are at least partially liquefied or softened by means of a heating arrangement and are removed from the vacuum separator,
and in that, by means of a mechanical purifying device—in particular, with at least one scraper—the substances separated on the cooling arrangement are superficially scraped off at least partially.

3 more elements

Device for the purification of gases from the degassing of polymer melts, wherein the gas to be purified is fed from a vacuum zone of a plasticizing unit to the device by means of at least one vacuum or degassing line,

with a vacuum separator,
which has a housing having a gas inlet for the gas to be purified and a gas outlet,
having a cooling arrangement, by means of which condensible, separable by freezing, and/or re-sublimable substances can be separated from the supplied gas to be purified,
and from which the separated substances can be removed from the housing of the vacuum separator,
wherein,
the cooling arrangement is designed so that the separation of the substances from the gas to be purified in the vacuum separator occurs by freezing-out the substances to be separated,
the vacuum separator is provided with a heating arrangement which is suitable for at least partially liquefying or softening substances separated by means of the cooling arrangement,
it further has a mechanical purifying device—in particular, with at least one scraper—for at least partial surface scraping of the cooling arrangement,
and in that a removal opening is provided in the lower region of the housing of the vacuum separator, via which removal opening the substances to be at least partially liquefied or softened can be removed.

6 more elements

Dependencies are inferred from the claim text.