Method for producing a pleatable textile fabric with electrostatically charged fibers
AssigneeGroz-Beckert KG
InventorsRalph Berkemann, Fabian Stauss, Frank Endriss, Andreas Tulke
Life of this patent
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Abstract
A method for producing a pleatable textile object having electrostatically charged fibres, and to a pleatable textile object is described. At least two separate dies are used, one for the production of finer fibres and one for the production of coarser fibres, using a melt spinning process. At least the first die, which is used to produce the coarser fibres, has concentric orifices. The finer and coarser fibres are mixed at least in sections during the process and are also charged electrostatically with the aid of a polar liquid. The textile object can be used to make filters with a quality factor in excess of 0.2.
Claims11
A method for producing a pleatable textile object having electrostatically charged fibres, comprising:
- using a die arrangement comprising at least separate first and second dies, wherein at least the first die has concentric orifices,
- extruding a first polymer to fibres of a first fibre type using the first die with a meltblown spinning process,
- extruding a second polymer to fibres of a second fibre type using the second die with a meltblown spinning process,
- spinning the fibres of the first and of the second fibre type such that the average of the fibre diameter of the first fibre type is larger than 10 microns, whereas the fibres of the first fibre type have a larger average fibre diameter than the fibres of the second fibre type,
- mixing the fibres of the first fibre type with the fibres of the second fibre type, at least in sections, at least one of before and during shaping of the textile object with the aid of a collecting device,
- treating at least one of the fibres of the first fibre type and the fibres of the second fibre type with a polar liquid during at least one of fibre formation and drawing, thereby charging the fibres electrostatically;
- one of before and during shaping of the textile object, mixing the fibres of the first fibre type with the fibres of the second fibre type in such a way that, at least in a partial volume of the textile object, the proportion of fibres of the first fibre type and of fibres of the second fibre type show a gradient over a cross section of the textile object;
- and
- orienting the gradient such that the proportion of fibres of the first fibre type relative to the fibres of the second fibre type is higher at an upstream flow side of the textile object and the proportion of fibres of the second fibre type relative to the fibres of the first fibre type is higher at a downstream flow side thereof.
Dependencies are inferred from the claim text.