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
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
  • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes

Definitions

• the present invention relates to a device for cooling, stabilizing and preparing melt-spun filaments, consisting of a blow candle arranged in the center of an annular filament bundle and a preparation device.
• a porous blow candle which is inserted from below into the center of an annular bundle of fibrils and which passes through the fibril bundle with a gas stream in a radially asymmetrical manner from the inside to the outside, CH-A-667676.
• the fibrils can thus be subjected to a preparation immediately below the blow candle and then combined to form a closed bundle. There is no sticking between the individual fibrils.
• the object of the present invention is to cool and solidify a melt-spun multifilament in such a way that the molecular orientation within the individual filaments is uniform.
• a further task lies in larger melt throughputs per fibril or higher speeds, which is of particular interest for use in the production of continuous filaments.
• the object is achieved according to the invention in that a closed tube is arranged between the blow candle and the preparation device.
• the distance between the blow candle and the application device for the preparation agent is increased.
• This has the advantage that for cooling a melt-spun fi lamentes a longer period of time is available. This is all the more important the thicker the individual filaments and the higher the spinning take-off speed. It is therefore expedient that the location at which the freshly spun filament comes into mechanical contact with a thread guide member of any kind is located further from the spinneret, the larger the filament titer or the higher the take-off speed. The titer that the filament has during the cooling phase is of importance here.
• the distance between the start of the blowing and the location of the preparation order is at least 950 mm. Since the application device itself protrudes 220 mm beyond the point at which the preparation is actually being applied, it is expedient to provide a tube of at least 200 mm in length between the blow candle and the preparation device.
• the tube is surrounded by a conical jacket.
• the cooling air is conducted quantitatively, continuously and without turbulence from the inside of the cylindrical fibril bundle to the outside.
• the length of this tube should be between 200 and 2000 mm, in particular between 200 and 1780 mm, preferably between 200 and 1160 mm.
• Coarser filament titers and higher spinning speeds require larger distances between the blow candle and the location of the preparation job than shorter distances. The same applies to substances with a higher heat content. Under certain circumstances, this leads to tube lengths in which the mechanical stabilization of the cylindrical fibril bundle becomes problematic. It is known that a free fibril oil bundle is disturbed by external air influences, the longer it is.
• the cooling conditions require certain minimum lengths, on the other hand, suitable measures must be taken to ensure that the disruptive influence of external air flows is eliminated or at least reduced to the required extent.
• a stationary jacket which in a preferred embodiment consists of a cylindrical perforated plate. This jacket extends from the lower edge of the spinneret pack or heating collar, if present, to the area of the preparation device. A defined distance from the spinneret package or heating collar or from the preparation device can be provided both at the upper and at the lower end of this jacket in order to create the possibility of a controlled air exchange with the surroundings.
• the jacket is expediently designed so that both a part of it can be opened to the rear and a part to the front.
• the former is necessary to enable the blow-on candle to travel the required distance that the device travels when it exits the operating position.
• the latter is used to open the spinning shaft for the operating personnel, e.g. in the case of tensioning, feed the thread down from the spinning stick into the space below with the take-off device.
• the product is expedient for the product to be made of the spinning speed v (in m / min) and the square root of the filament titer (in dtex) is between 5000 and 20,000, preferably between 5270 and 11,000.
• melt-spun filaments are given sufficient time to cool down before they come into mechanical contact with the application device for the spin preparation.
• Fig. 1 is a schematic of the cooling device
• FIG. 2 shows a variant of the closed tube according to FIG. 1
• the reference number 1 denotes a spinneret pack, which is arranged within a heating collar 2.
• the spinneret pack and the heating collar 2 are surrounded by insulation 15.
• a porous blow candle 4 is gas-tightly connected to a tube 5 of approximately the same diameter, which is closed over its entire length.
• annular preparation device 6 is arranged concentrically, which serves to apply a spin preparation to a filament bundle 3.
• the blow candle 4, the closed tube 5 and the preparation device 6 are carried by a tube cone 9, which in turn is movably connected to the building in a manner not shown via a narrow connecting channel 10 and a further closed tube 11.
• the entire device is arranged to be completely movable out of the thread path.
• a mandrel 12 At the upper end of the blow candle 4 is a mandrel 12, which in the operating position of the device in a corresponding bore 13 in the center of the Spinneret pack 1 engages.
• a spinning tube 8 At the upper end of which a convergence device 7 is attached.
• the blow candle 4, the closed tube 5 and the 'preparation device 6 are surrounded by a jacket 14 which is formed in a preferred embodiment of a perforated plate.
• the tube 5 can be surrounded by a conical jacket 16.
• the blow candle 4 can, as far as this is technically possible, be positioned up to the immediate vicinity of the spinneret plate. Furthermore, for the purpose of controlled air exchange with the surroundings, a defined distance from the spinneret plate or heating collar or from the preparation device can be provided both at the upper and at the lower end of the jacket 14.
• the blow candle 4 is supplied with the required cooling air via the pipeline 11, the connecting duct 10, the pipe cone 9, the preparation device 6 and the pipe 5, which air escapes radially symmetrically from the porous surface of the blow candle 4.
• the preparation device 6 is supplied with the corresponding preparation via a line, not shown, which is laid within the tube 11, the connecting channel 10 and the tube cone 9.
• the polymer melt to be spun is discharged in a known manner through spinneret bores arranged on concentric circles. It first passes in a free fall the heating collar zone 2 and then reaches the area of the blow candle 4, where it is cooled by the cooling air escaping and solidified into filaments 3.
• Tube 5 defined path the filaments 3 are provided with a spin finish by means of the preparation device 6. Then the individual filaments with the help of the convergence thread guide 7 conically combined to a closed filament bundle 3 'and fed through the spinning tube 8 to the thread take-off device, also not shown.
• the emerging melt was cooled with the central blower according to the invention using 600 cbm / h of air at 35 ° C.
• the blow candle 4 was 530 mm long with a diameter of 95 mm.
• the closed tube 5 between the blow candle 4 and the application device 6 for the preparation was 200 mm long, so the location for the application of the preparation was 420 mm below the blow candle.
• the consolidated multifilament was withdrawn from the spinning shaft at a speed of 3100 m / min.
• the melt throughput was chosen so that the individual filaments had a titer of 3.6 dtex.
• the optical double refraction values measured on this multifilament were in the range between 0.048 and 0.053. The molecular orientation of the multifilament was therefore sufficiently regular that good further processing was possible. Examples 2 to 4
• Polyethylene terephthalate as in Example 1 was spun and cooled in the same manner.
• the length of the tube 5 was 1160 mm, i.e. the application device for the spin preparation 6 was 1380 mm below the blow candle.
• the melt throughput per spinneret bore was varied in such a way that multi-filaments resulted at a take-off speed of 3100 m / min, the individual fibril titer of which was between 4.5 and 11.5 dtex. With these multifilaments, too, the values for the optical birefringence were within a narrow range of 0.006 units.
• Polyethylene terephthalate was spun as in Example 1 and cooled and solidified under the same conditions.
• the length of the tube 5 was 200 mm.
• the take-off speed was 2000 m / min.
• the melt throughput was chosen so that a multifilament with 8.5 dtex individual fibril titer resulted.
• the optical birefringence values found on these filaments were within a range between 0.024 and 0.045.
• Polyethylene terephthalate was spun as in Example 1, cooled and solidified. However, a multifilament with 5.6 dtex single fibril titer was produced at 3100 m / min. Here, values for the optical birefringence were found which were within a range from 0.048 to 0.110.
• Threads according to Examples 1-4 can be further processed, in particular drawn. With the threads according to Examples 5 and 6, an intolerable number of filament breaks occur during stretching.
• the process according to the invention can be carried out with all known thermoplastic polymers, in particular with polyesters such as polyethylene terephthalate, polyamides such as polycaprolactam, polyhexamethylene adipic acid and the like, used in the textile field, polyamides, polyetylene, polypropylene and their relatives, Po - Lyacrylonitrile etc. Please note that Turnings of the invention to other polymer pipe lengths up to 2000 mm may be required.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

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Publications (1)

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Cited By (9)

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Citations (5)

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• 1989
  • 1989-01-30 CH CH289/89A patent/CH678433A5/de not_active IP Right Cessation
• 1991
  • 1991-03-04 EP EP91904645A patent/EP0527134B1/de not_active Expired - Lifetime
  • 1991-03-04 BR BR919106417A patent/BR9106417A/pt not_active Application Discontinuation
  • 1991-03-04 DE DE59105531T patent/DE59105531D1/de not_active Expired - Fee Related
  • 1991-03-04 WO PCT/CH1991/000050 patent/WO1992015732A1/de active IP Right Grant
  • 1991-03-04 JP JP3504170A patent/JP2809878B2/ja not_active Expired - Lifetime
  • 1991-03-04 ES ES91904645T patent/ES2075430T3/es not_active Expired - Lifetime

Patent Citations (5)

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