US 2026/0022498 A1Published application

Method for producing an elastic yarn by means of melt extrusion spinning

AssigneeDecathlon

InventorsSliman ALMUHAMED, Jan THIEL, Felix Krooß

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Abstract

The present disclosure relates to a method for manufacturing an elastic yarn by melt spinning by means of a spinning machine including an extruder and a spin pack comprising at least one die, the method comprising at least the following steps: a preliminary cold drawing of the yarn at the outlet of the die, followed by a hot drawing of the yarn then by a cold drawing of the yarn. The present disclosure also relates to a textile comprising such an elastic yarn and to a plant configured to implement this method.

Claims26

Dependent claims

A method for manufacturing an elastic yarn by melt spinning by means of a spinning machine comprising an extruder, a spinning metering pump, a spin pack comprising at least one die, a cooling system, at least one take-up roll and at least one drawer roll the method comprising at least the following steps:

A) the extruder is fed with granules of a copolymer with polyamide blocks and with polyether blocks, the polyamide blocks being selected amongst PA 11, PA 12, PA 1010, PA 1014, a copolymer thereof and a mixture thereof, the polyether blocks being blocks derived from polytetramethylene glycol, a hardness of the copolymer measured according to the standard 7619-1 being comprised between 22 and 61 ShD, in order to obtain by extrusion a molten elastomer of the copolymer with polyamide blocks and with polyether blocks,
B) the molten elastomer obtained in step A) is spun within the die of the spin pack in order to obtain a yarn of the copolymer with polyamide blocks and with polyether blocks,
C) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained in step B) is subjected at an outlet of the die to cooling down to a temperature strictly lower than the glass-transition temperature of the polyamide blocks, for example to a temperature ranging from about 10° C. to about 49° C., ranging from about 10° C. to about 30° C., and ranging from about 20° C. to about 25° C.,
D) the yarn of the copolymer with polyamide blocks and with polyether blocks is subjected to a preliminary drawing at the temperature of step C),
E) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained upon completion of step D) is subjected to a hot drawing at a temperature strictly higher than the glass-transition temperature of the polyamide blocks, for example at a temperature ranging from about 45° C. to about 125° C., ranging from 45° C. to 120° C., ranging from about 50° C. to about 125° C., and ranging from about 90° C. to about 120° C.,
F) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained upon completion of step E) is subjected to a cold drawing at a temperature ranging from about 10° C. to about 49° C., ranging from about 10° C. to about 30° C., and ranging from about 20° C. to about 25° C.

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Dependencies are inferred from the claim text.

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Abstract

A) the extruder is fed with granules of a copolymer with polyamide blocks and with polyether blocks, the polyamide blocks being selected amongst PA 11, PA 12, PA 1010, PA 1014, a copolymer thereof and a mixture thereof, the polyether blocks being blocks derived from polytetramethylene glycol, a hardness of the copolymer measured according to the standard 7619-1 being comprised between 22 and 61 ShD, in order to obtain by extrusion a molten elastomer of the copolymer with polyamide blocks and with polyether blocks,
B) the molten elastomer obtained in step A) is spun within the die of the spin pack in order to obtain a yarn of the copolymer with polyamide blocks and with polyether blocks,
C) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained in step B) is subjected at an outlet of the die to cooling down to a temperature strictly lower than the glass-transition temperature of the polyamide blocks, for example to a temperature ranging from about 10° C. to about 49° C., ranging from about 10° C. to about 30° C., and ranging from about 20° C. to about 25° C.,
D) the yarn of the copolymer with polyamide blocks and with polyether blocks is subjected to a preliminary drawing at the temperature of step C),
E) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained upon completion of step D) is subjected to a hot drawing at a temperature strictly higher than the glass-transition temperature of the polyamide blocks, for example at a temperature ranging from about 45° C. to about 125° C., ranging from 45° C. to 120° C., ranging from about 50° C. to about 125° C., and ranging from about 90° C. to about 120° C.,
F) the yarn of the copolymer with polyamide blocks and with polyether blocks obtained upon completion of step E) is subjected to a cold drawing at a temperature ranging from about 10° C. to about 49° C., ranging from about 10° C. to about 30° C., and ranging from about 20° C. to about 25° C.

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