Method for spinning a spinning solution and spinning head
OwnerStefan Zikeli, Friedrich Eckerinventors
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Abstract
The present invention relates to a spinning head (8) for spinning a spinning dope, which is provided with a tubular, thin-walled spinning capillary (7) having a discharge opening (94). The spinning dope used is e.g. a mixture of cellulose, tertiary amine oxide and water. In order to reduce the fibrillation tendency of the fibres spun by means of the spinning head and in order to increase the non-looping property, the present invention is so conceived that the spinning capillary (7) is heated directly close to the discharge cross-section (94). By means of this simple measure, it is possible to reduce the fibrillation tendency and to increase the non-looping property.
Claims49
A method of spinning a spinning dope comprising a mixture of cellulose, water and tertiary amine oxide, said method comprising the steps of supplying the spinning dope to at least one spinning head and conducting it in said spinning head through at least one spinning capillary provided at its downstream end with a spinning-dope discharge opening through which the spinning dope is discharged from the spinning head, characterized in that, close to said spinning-dope discharge opening (94), the wall of the spinning capillary (7) is heated, at least sectionwise, to a temperature which is higher than the core temperature of the spinning dope in the spinning capillary.
A method according to one of the above-mentioned claims, characterized in that the wall temperature of the spinning capillary (7) is controlled in dependence upon the mass flow rate of the spinning dope through the spinning capillary (7).
A method according to one of the above-mentioned claims, characterized in that the wall temperature of the spinning capillary (7) is controlled in dependence upon the spinning pressure in the spinning dope, preferably in dependence upon the spinning pressure of the spinning dope in the spinning capillary (7).
A method according to one of the above-mentioned claims, characterized in that, a predetermined temperature profile across the flow cross-section of the spinning capillary (7) is adjusted by heating the spinning-capillary wall when the spinning capillary is in operation.
A method according to one of the above-mentioned claims, characterized in that, a predetermined temperature profile of the spinning-capillary wall is adjusted in the direction rection of flow of the spinning dope by heating the spinning-capillary wall when the spinning capilary is in operations.
A method according to one of the above-mentioned claims, characterized in that the spinning-capillary wall is heated by a heating fluid which flows around the wall of the spinning capillary on the outside thereof.
A spinning head for spinning a spinning dope which consists of a mixture of cellulose, water and tertiary amine oxide and which flows through the spinning head, comprising at least one spinning capillary having a spinning-dope discharge opening at its downstream end, the spinning dope being discharged from the spinning head through said spinning-dope discharge opening, and further comprising a temperature-controlled heating device which acts on said spinning dope, characterized in that, in an area close to the spinning-dope discharge opening (94), the wall temperature of the spinning capillary (7) produced by the heating device (70, 72) is higher than the core temperature of the spinning dope, when the spinning head (8) is in operation.
Dependencies are inferred from the claim text.