WO1998045513A1 - Element end process for washing or treating a yarn or similar structure with a fluid - Google Patents
Element end process for washing or treating a yarn or similar structure with a fluid Download PDFInfo
- Publication number
- WO1998045513A1 WO1998045513A1 PCT/EP1998/001782 EP9801782W WO9845513A1 WO 1998045513 A1 WO1998045513 A1 WO 1998045513A1 EP 9801782 W EP9801782 W EP 9801782W WO 9845513 A1 WO9845513 A1 WO 9845513A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- yarn
- fluid
- slot
- washing
- cavity
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/06—Washing or drying
Definitions
- the invention pertains to an element for washing or treating a yarn or similar structure with a fluid, the element comprising a cavity for guiding the 5 yarn and at least one fluid jet for directing the fluid into the yarn.
- Such a washing element is known from WO 93/06266, which describes how the exchange of mass and heat between a yarn and a washing fluid can be improved by jetting the fluid into the yarn. As a result of the 10 enhanced exchange, the time needed for washing the yarn is reduced and the machinery involved can be smaller.
- washing or treating fluid Another problem encountered during the washing or treating of yarns is the consumption of washing or treating fluid.
- a washing fluid containing, e.g., sulphuric acid removed from an aramid yarn usually needs further processing before it can be re-used or discharged, which always incurs additional costs. Therefore, the amount of fluid used in the washing or treating process should be as low as possible and the mass transfer to the fluid should be as effective as possible.
- the slot runs the length of the cavity.
- the spinning in (also referred to as threading in or lacing up) of the filament in the element can be further enhanced by using a slot that diverges near the outside of the element. That way, the opening for the filament to enter the element is more accessible.
- the element according to the invention comprises two jets making a sharp angle (smaller than 90 degrees) with one another, thus allowing a compact design of the element.
- the slot In order to allow the water column or bath inside the slot to have sufficient height, the slot should be relatively narrow.
- the slot has a width in the range from 0.3 to 4 mm.
- the optimal width is dependent on the surface tension of the fluid used and, therefore, in some instances the optimal width may be larger than the said 4 mm.
- the length of the slot and/or the cavity preferably exceeds 8 mm, the range from 20 mm to 100 mm being most preferred, while the height of the slot preferably exceeds 10 mm, the range from 15 mm to 40 mm being most preferred.
- the tubular cavity effectively has a cross- section that is V-shaped with the vertex of the V pointing away from the jets, which, as stated above, preferably make a sharp angle with one another.
- the water exiting the jets pushes the filament towards the vertex and guarantees that it remains in the same position.
- the tubular cavity itself can be V-shaped, but it is preferred that a member which fits into the cavity and has a V-shaped cross-section is inserted in the tubular cavity.
- the material of the member can be selected independent from the material of the element for washing or treating a yarn, can be manufactured separately, and can be easily replaced during maintenance (after all, the cavity through which the yarn travels will be subject to wear).
- the element of the present invention preferably comprises at least two parallel cavities.
- the element (11) comprises building blocks (12) which are symmetrical with regard to a plane parallel to the slot (13) and which have approximately half of the cavity (14) and the slot (13) on both outer sides of the element parallel to the said plane.
- the building blocks (12) are positioned next to each other, thus forming the cavities (14) and the conduits for the internal transport of the fluid.
- the positioning of the building blocks (12) can be done, e.g., by a snap-fit connection (15) of the building blocks (12) with a frame (not shown).
- the snap-fit connection (15) allows fast replacement of one or more (defective) building blocks (12) with new ones without the need to take the entire construction apart. Interruption of the washing or treating of the yarn is thus kept to a minimum amount of time.
- the element (11) further comprises a protrusion (16) or "balcony" above the entrance of the cavities (14) which serves to capture fluid that clings to the yarn after it has left a first element and forms small droplets upon entrance of a second or further element.
- a sloping ledge (17) is provided near the exit of the cavities (14).
- the element can be made with advantage of a polymer because this allows the use of very accurate and inexpensive production technologies such as injection moulding.
- the selection of a suitable polymer is mainly dependent on the fluid which is used in the washing or treating process and the material that is washed off the yarn.
- a tubular member (containing the appropriate openings for the jets) can be inserted into the cavity.
- This insert can be made of a material which, for instance, is hard and wear-resistant, e.g., a ceramic material.
- the invention also pertains to a process for washing or treating a yarn or a similar structure using the element of the present invention.
- the fluid output of the jets is selected so as to fill the slot for the greater part with the said fluid.
- the fluid mentioned above may be any fluid suitable for washing or treating a yarn or similar structure, but liquids are preferred.
- it can be a chemical of any kind or water.
- the yarn may have been prepared by means of a dry spinning or a wet spinning process, i.e., from a melt or solution by extruding through a spinneret, or by means of a mechanical spinning process.
- the process according to the invention thus is especially suitable for lyocell yarns (e.g., Newcell®), rayon yarns (e.g., Cordenka®), other solvent spun cellulosic yarns, polyester yarns, nylon yarns, aramid yarns (e.g., PPDT such as Twaron®), carbon yarns, silica yarns, cotton yarns, porous and non-porous hollow fibres made of cellulosic or synthetic polymers also known to this end which optionally act as membranes, etc.
- GB 762,959 discloses a process similar to that disclosed in WO 93/06266, which has been discussed above. Neither the tubular cavity nor the slot is mentioned or suggested in GB 762,959, however.
- US4,453,298 discloses a texturizing nozzle for synthetic filiaments which is openable and closeable to facilitate lacing up. Said nozzle is not designed to extract substances from a running yarn but, instead, to entangle its filaments, which is a fundamentally different action.
- Fig. 1 shows a perspective view of a preferred embodiment of the present invention.
- Fig. 2 shows a cross-section of the embodiment which is the subject of the example below, equipped with a V-cross-section ceramic insert.
- An element (21) for washing a yarn consists of 6 main building blocks (22) made of stainless steel forming 5 cavities (23) and 5 slots (24) in all.
- the cavities (23) are 40 mm long and have a diameter of 5.5 mm. In the cavities
- the slots are 0.5 mm wide, 40 mm (element A1) or 10 mm (element A2) long, and 20 mm high.
- the slots are 0.5 mm wide, 40 mm (element A1) or 10 mm (element A2) long, and 20 mm high.
- the fluid jets (26) diverge near the outside of the element (27).
- the fluid jets (26) are pointed towards the vertex of the V, make an angle of 40° with one another, and have a round cross-section with a diameter of 0.5 mm.
- the fluid is transported via the main inlet (28) and smaller conduits (29) to the cylindrical cavities (30), which are sealed by stops (31). From the cylindrical cavities (30) the fluid is injected into the cavities (23) by means of jets (26).
- the stainless steel element comprises two walls which are 2.5 mm apart. In between the walls and transverse to the travelling direction of the yarn two cylindrical, horizontal guides are mounted for guiding the yarn.
- the walls are both provided with a fluid jet having a round cross-section with a diameter of 0.5 mm.
- the fluid jets are positioned opposite to one another and make an angle of 180° with one another (i.e., they are in line with one another and both in the horizontal plane through which the yarn travels).
- Reduction of the fluid flow rate did not substantially affect the mass transfer.
- the spinning in of the yarn to the element A1 or A2 could be performed by simply inserting the yarn in a slot until a point below the jets was reached. After that the yarn was automatically pushed into the cavity where the positioning of the yarn happens automatically. To ensure positional stability for the yarn travelling through element B it was necessary to position the yarn above the first guide and below the second guide, which is a time-consuming operation, and even then the positional stability was not satisfactory.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/380,402 US6270532B1 (en) | 1997-04-04 | 1998-03-19 | Element for washing or treating a yarn or similar structure with a fluid |
PCT/EP1998/001782 WO1998045513A1 (en) | 1997-04-04 | 1998-03-19 | Element end process for washing or treating a yarn or similar structure with a fluid |
EP98912506A EP0972098A1 (en) | 1997-04-04 | 1998-03-19 | Element end process for washing or treating a yarn or similar structure with a fluid |
AU67310/98A AU6731098A (en) | 1997-04-04 | 1998-03-19 | Element end process for washing or treating a yarn or similar structure with a fluid |
JP54231598A JP2001518987A (en) | 1997-04-04 | 1998-03-19 | Element for washing or treating a thread or similar tissue with a fluid |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97200986.4 | 1997-04-04 | ||
EP97200986 | 1997-04-04 | ||
PCT/EP1998/001782 WO1998045513A1 (en) | 1997-04-04 | 1998-03-19 | Element end process for washing or treating a yarn or similar structure with a fluid |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998045513A1 true WO1998045513A1 (en) | 1998-10-15 |
Family
ID=26070304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/001782 WO1998045513A1 (en) | 1997-04-04 | 1998-03-19 | Element end process for washing or treating a yarn or similar structure with a fluid |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0972098A1 (en) |
AU (1) | AU6731098A (en) |
WO (1) | WO1998045513A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2844019A (en) * | 1954-07-03 | 1958-07-22 | Bayer Ag | Apparatus for the aftertreatment of endless cables or tows of artificial filaments |
US4298565A (en) * | 1980-02-12 | 1981-11-03 | E. I. Du Pont De Nemours And Company | Spinning process |
US4453298A (en) * | 1980-03-31 | 1984-06-12 | Rieter Machine Works, Ltd. | Construction of thread texturizing nozzles |
-
1998
- 1998-03-19 AU AU67310/98A patent/AU6731098A/en not_active Abandoned
- 1998-03-19 EP EP98912506A patent/EP0972098A1/en not_active Withdrawn
- 1998-03-19 WO PCT/EP1998/001782 patent/WO1998045513A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2844019A (en) * | 1954-07-03 | 1958-07-22 | Bayer Ag | Apparatus for the aftertreatment of endless cables or tows of artificial filaments |
US4298565A (en) * | 1980-02-12 | 1981-11-03 | E. I. Du Pont De Nemours And Company | Spinning process |
US4453298A (en) * | 1980-03-31 | 1984-06-12 | Rieter Machine Works, Ltd. | Construction of thread texturizing nozzles |
Also Published As
Publication number | Publication date |
---|---|
EP0972098A1 (en) | 2000-01-19 |
AU6731098A (en) | 1998-10-30 |
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