EP0372194A2 - Machine d'étirage de fils thermoplastiques - Google Patents
Machine d'étirage de fils thermoplastiques Download PDFInfo
- Publication number
- EP0372194A2 EP0372194A2 EP89118661A EP89118661A EP0372194A2 EP 0372194 A2 EP0372194 A2 EP 0372194A2 EP 89118661 A EP89118661 A EP 89118661A EP 89118661 A EP89118661 A EP 89118661A EP 0372194 A2 EP0372194 A2 EP 0372194A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- rollers
- roller
- stretching
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
Definitions
- the invention relates to a device for stretching thermoplastic threads according to the preamble of patent claim 1.
- the optimal stretching must take place with the highest possible stretching ratio in a narrowly limited temperature interval.
- the stretching supplies energy to the thread.
- the size of the energy depends on the stretching ratio and the stretching force.
- the thread is heated by the energy supplied.
- the draw ratio must be limited to values at which the heating does not cause an increase in temperature, which leads to a reduction in the strength of the thread and thus to thread breakage.
- drawing devices In order to enable larger drawing ratios, drawing devices have been developed in which the thread passes through several drawing zones in succession. It is only in the drawing zone that is adjacent to the drawing device that the drawing force effective in the thread reaches its maximum value. The stretching force is gradually reduced in the direction of the delivery unit - that is, in the opposite direction to the thread running direction.
- the stretching is therefore carried out with reduced stretching force, with the exception of the last stretching zone. This means that less energy is introduced at the same stretch ratio. This means that higher stretching ratios are possible without the thread breaking.
- additional rollers are arranged between the delivery unit and the drafting unit, which act as separators between the successive drawing zones.
- Each roller is provided with a drive and has a peripheral speed at which there is slippage between the roller and the thread. If the peripheral speed of the roller is slower than the thread speed at the point of contact or if it is opposite to the thread speed, then the frictional force between the roller and the thread causes a reduction in the stretching force; that is, the stretching force upstream of the roll is less than downstream.
- the magnitude of the frictional force depends on the relative speed between the thread and the roller and on the surface condition of the roller.
- the roller can also serve as a heating or cooling element.
- At least three axially parallel deflecting rods are arranged in a stretching device in a heated water bath, which are preferably not rotatable.
- the thread alternately wraps around the deflecting rods in a zigzag shape.
- a stretching device described in US Pat. No. 3,978,192 has, as deflection members, two rotatable rotary bodies which are arranged next to one another at a short distance and which can also be heated.
- the axes are slightly skewed to each other.
- At least one of the two rotating bodies is conical, the increase in radius in the axial direction taking the form of small steps.
- the second rotary body can also be such a cone, but can also consist of a series of loose rollers seated side by side on an axis.
- the thread wraps around the two rotating bodies in several helical turns and moves in the direction of increasing radii of the cone. It lies on the conical surface without slippage and is therefore stretched to a defined extent with each revolution, which corresponds to the increase in the radius. In this way, a consistently graded drawing is ensured while avoiding sliding friction. However, an optimal gradation of the stretching force is not guaranteed.
- CH-PS 2 84 352 describes a drawing device in which at least one deflecting body - for example a heated roll - is provided between the delivery unit and the drawing unit, which deflects the thread from the straight line by less than 90 degrees. Due to the deflection, the structure of the material to be treated is loosened so that immediately afterwards Flow occurs. This is to ensure that the stretching always takes place in the same place, namely on the deflecting body. A division of the stretching process over several stretching zones with different stretching force is not intended and cannot be carried out with this device either.
- the invention has for its object to provide an improved device of the type specified in the preamble of claim 1, in which very high stretching ratios can be achieved while avoiding sliding friction by exact gradation of the stretching force along the thread path between the delivery mechanism and the drafting mechanism.
- Additional unbraked rolls according to claim 4, in particular in the arrangement according to claim 5, allow the thread temperature within the individual drawing zones to be influenced.
- the arrangement according to claim 7 is characterized by simplicity and good accessibility of the individual roles.
- the arrangement according to claim 8 has a particularly space-saving structure.
- a plurality of non-driven, independently rotatable rollers 4, 5 are arranged between a delivery unit 1 and a drafting unit 2 in a housing 3.
- the housing 3 is filled with air, steam or another gaseous medium.
- the delivery unit 1 is preceded by an inlet duo 6, consisting of an inlet roller 7 and a separating roller 8.
- Delivery unit 1 and The drafting system 2 consists of two essentially parallel-axis rollers 9, 10 and 11, 12.
- the delivery mechanism 1 and the drafting system 2 are coupled to a drive, not shown, which ensures that a constant speed ratio is maintained, in which the peripheral speed of the rollers 11, 12 of the The drafting unit 2 is higher than the peripheral speed of the rollers 9, 10 of the delivery unit 1 in accordance with the desired stretching ratio.
- the rollers 4 are arranged near the bottom of the housing 3 so that their axes are parallel to each other in a horizontal plane.
- the center distance of adjacent rollers 4 is approximately equal to twice the roller diameter.
- the rollers 5 are arranged in a corresponding manner in the vicinity of the housing ceiling. They lie relative to the rollers 4 on a gap, so that the connecting line of the axes of all rollers 4, 5 has a zigzag shape.
- the rollers 4, 5 are heated.
- each roll can be provided in the usual way with an individual heating device arranged inside the roll.
- the rollers can also be indirectly heated in such a way that a heated gas flows through the interior of the housing 3 or is equipped with radiators (not shown).
- the rollers 4 are mounted with low friction, for example with roller bearings.
- the rollers 5 are also equipped with low-friction bearings and also each provided with a brake 13.
- Suitable brakes are, for example, commercially available eddy current hysteresis brakes or fluid swirl brakes, each with an adjustable braking torque.
- the thread 15 fed in the direction of the arrow 14 wraps in several turns around the inlet duo 6 and then the heated rollers 9, 10 of the feed unit 1. Then it runs on a zigzag path without Slip around the rollers 4, 5, which assume a peripheral speed corresponding to the thread speed.
- the wrap angle on the individual rollers 4, 5 is 180 degrees, with the exception of the roller initially lying on the delivery mechanism 1 and on the drafting mechanism 2; the wrap angle on these two rollers is 90 degrees.
- the thread arrives at the drafting unit 2.
- the peripheral speed of the rollers 11, 12 is substantially higher - for example 4 times to 8 times - than that of the rollers 9, 10.
- the stretching force is gradually reduced by the rollers 5 provided with brakes in the opposite direction to the movement of the thread. It is therefore much lower than the maximum stretching force at the exit of the delivery unit 1.
- the ratio of the maximum to the minimum stretching force is at least 1.2, preferably 6 to 10 or even higher.
- the maximum stretching force is, for example, 3 to 3.5 cN / dtex, the minimum stretching force is 0.2 to 0.5 cN / dtex.
- the stretching force can be reduced in even or uneven steps depending on the setting of the braking torque. For example, it can be advantageous to provide larger steps on the inlet side than on the outlet side.
- the stretching force can be measured and controlled, for example, with the aid of force measuring devices, not shown, which are expediently attached to the bearings of the unbraked rollers 4.
- the freely rotatable, unbraked rollers 4 have no significant direct influence on the stretching force due to their negligible bearing friction. However, they help to keep the thread temperature at the desired level by dissipating excess heat which is supplied to the thread in the form of the mechanical work done during drawing.
- the stretching takes place in several steps, the relative size of which depends on the gradation of the stretching force.
- the total stretching corresponds to the speed ratio between drafting unit 2 and delivery unit 1.
- an axle 40 is fastened on one side to the rear wall of a housing 30 near the bottom.
- Rollers 41 to 47 are mounted on it.
- Each roll has two circumferential, flat ring grooves lying next to each other on the outer surface for two threads running in parallel.
- the gaps existing between the individual rollers 41 to 47 enable the rollers to rotate freely independently of one another.
- Some of the rollers 41 to 47 are provided with brakes 33, as can be seen from the example of the roller 44 shown in section.
- Other rollers, such as roller 46, which is also shown in section, are unbraked.
- rollers 51 to 56 are mounted on an axis 50, which is arranged approximately parallel to the housing ceiling, but is slightly skewed to the axis 40. Of these, at least the roller 55 is provided with a brake. The roller 55 is rotatably coupled to the adjacent roller 56 by a pin 35.
- All rollers 41 to 47, 51 to 57 are low-friction, not driven and - with the exception of the two rollers 55, 56 - can be rotated independently of one another.
- Two threads 15 run from a delivery mechanism not recognizable in FIG. 2 to the roller 41 and then loop around the roller arrangement in several turns in the manner of a double-start screw.
- the wrap angle on each roll is approximately 180 degrees.
- the threads run from the roll 47 to a drafting system, not shown.
- the mode of operation is - apart from the different order in which the braked and the unbraked rolls are arranged along the thread path - analogous to the mode of operation described in connection with FIG. 1, but with the exception that the threads on the path from the roll 55 run over the unbraked, freely rotatable roller 46 to the roller 56 without stretching.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3840602A DE3840602A1 (de) | 1988-12-02 | 1988-12-02 | Vorrichtung zum verstrecken von thermoplastischen faeden |
| DE3840602 | 1988-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0372194A2 true EP0372194A2 (fr) | 1990-06-13 |
| EP0372194A3 EP0372194A3 (fr) | 1990-11-14 |
Family
ID=6368300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890118661 Withdrawn EP0372194A3 (fr) | 1988-12-02 | 1989-10-07 | Machine d'étirage de fils thermoplastiques |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4967457A (fr) |
| EP (1) | EP0372194A3 (fr) |
| DE (1) | DE3840602A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW357202B (en) * | 1996-12-20 | 1999-05-01 | Rhodial Ind Yarns Ag | Method and apparatus for manufacturing polyester formed industrial yarn |
| AT408354B (de) * | 1998-03-13 | 2001-11-26 | Sml Maschinengmbh | Einrichtung zum herstellen multifiler fäden |
| US7273578B1 (en) | 2001-10-16 | 2007-09-25 | Leonid Slutsker | Method and apparatus for low-speed, high-throughput fiber drawing using coiled fiber loops |
| KR20170131470A (ko) * | 2015-03-31 | 2017-11-29 | 도레이 카부시키가이샤 | 중공사막의 제조 방법 |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH284352A (de) * | 1950-03-23 | 1952-07-31 | Rieter Joh Jacob & Cie Ag | Verfahren und Einrichtung zur Herstellung eines Kunstfadens. |
| US3124631A (en) * | 1961-03-22 | 1964-03-10 | Process for providing high density dry spun | |
| US3422492A (en) * | 1965-02-23 | 1969-01-21 | Heplon Inc | Apparatus for stretching and crimping fibers |
| NL164909C (nl) * | 1968-10-08 | 1981-02-16 | Algemene Kunstzijde Unie Nv | Werkwijze en inrichting voor het in ten minste twee trappen strekken van een thermoplastisch produkt en het volgens de werkwijze vervaardigde produkt. |
| CA852426A (en) * | 1968-10-17 | 1970-09-29 | Chemcell Limited | Device for drawing synthetic polymeric filaments and fibres |
| US3723592A (en) * | 1970-11-10 | 1973-03-27 | Celanese Corp | Hot stepwise drawing of polybenzimidazole strand material with independent free-wheeling idler rolls |
| US3978192A (en) * | 1971-09-23 | 1976-08-31 | Sussman Martin V | Method of drawing fibers using a microterraced drawing surface |
| DE2200058A1 (de) * | 1972-01-03 | 1973-09-20 | Rosen Karl I J | Magnetische fadenbremse |
| US4095318A (en) * | 1975-07-15 | 1978-06-20 | Allied Chemical Corporation | Controlled tow stretcher |
| DE2534546B2 (de) * | 1975-08-02 | 1979-04-05 | Zimmer Ag, 6000 Frankfurt | Verfahren und Vorrichtung zum Verstrecken von Polyesterfadenkabeln |
| FR2427989A1 (fr) * | 1978-06-07 | 1980-01-04 | Rhone Poulenc Textile | Dispositif pour la regulation de la vitesse d'un organe delivreur ou renvideur de fil, en fonction de la vitesse d'appel de delivrage du fil |
| US4543697A (en) * | 1984-04-09 | 1985-10-01 | Eastman Kodak Company | Low friction drafting system for yarns |
| US4610060A (en) * | 1984-08-27 | 1986-09-09 | Eastman Kodak Company | Drafting system for yarns |
| DE3540181A1 (de) * | 1984-12-01 | 1986-07-10 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Verfahren zur herstellung von polyaethylen-faeden und vorrichtung zur ausfuehrung des verfahrens |
| DE19507432A1 (de) * | 1995-03-03 | 1996-06-13 | Daimler Benz Ag | Bremsanlage für Kraftfahrzeuge |
-
1988
- 1988-12-02 DE DE3840602A patent/DE3840602A1/de not_active Withdrawn
-
1989
- 1989-10-07 EP EP19890118661 patent/EP0372194A3/fr not_active Withdrawn
- 1989-11-20 US US07/439,535 patent/US4967457A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3840602A1 (de) | 1990-06-07 |
| US4967457A (en) | 1990-11-06 |
| EP0372194A3 (fr) | 1990-11-14 |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NEUMAG - NEUMUENSTERSCHE MASCHINEN- UND ANLAGENBAU |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 19910515 |