JP6726111B2 - Method and apparatus for drawing and drawing a plurality of freshly spun yarns - Google Patents

Description

The invention comprises a method for drawing and drawing a plurality of freshly spun yarns of the type described in the preamble of claim 1 and a plurality of freshly spun yarns of the type described in the preamble of claim 5. And a device for drawing and drawing the yarn.

During the production of the synthetic yarn in the melt-spinning process, the freshly spun yarns are guided in a sequence of godets with driven godet peripheral walls, preferably as one yarn group, for further processing after cooling. To be done. In this case, the godet peripheral wall of the godet may be designed to be heated or non-heated so that the yarn can be drawn, drawn and relaxed after spinning. Such a method and such a device are known, for example, from DE-A-102013211809 (DE102013211809A1).

In the known method and the known device, a plurality of yarns are guided together, as a group of yarns, on a peripheral surface of the driven godet peripheral wall, which is partially wound less than 360°. The peripheral wall of the godet is of a heating type and is arranged in the godet box. For this purpose, the yarn bundle is introduced into the godet box through the inlet opening and is again led out of the godet box through the outlet opening. The inlet opening and the outlet opening are formed such that the yarn groups can be guided side by side in parallel without contact.

In this case, air exchange between the surroundings and the inner chamber of the godet box is unavoidable. In particular, during the production of fully drawn yarn (FDY), the yarn needs to undergo intensive heat treatment on the surface of the godet peripheral wall. Despite the limited contact length between the yarn and the surface of the peripheral wall of the godet, in order to achieve sufficient heat treatment, a cooling step is avoided especially in the freely guided yarn section in the godet box. It should be. Further, for heat treatment, stable yarn traveling and a uniform yarn guide path on the peripheral surface of the godet peripheral wall are required.

The object of the present invention is therefore to provide a method and a device of the type mentioned at the outset for drawing and drawing a plurality of freshly spun yarns, which enables a uniform and stable heat treatment of the yarns in a godet box. Is.

Another goal of the present invention is to minimize heat loss during yarn processing.

This problem is solved according to the invention by a method having the features of claim 1 and an apparatus having the features of claim 5.

Advantageous aspects of the invention are defined by the features and combinations of features described in each dependent claim.

According to the invention, when producing fully drawn yarn (FDY), a relatively high yarn speed of up to 5000 m/min is produced, so that the yarn groups guided in the free section form a relatively strong associated air flow, It is based on the knowledge. Therefore, two disadvantageous effects occur at the entrance opening of the godet box. That is, the external airflow is continuously supplied to the environment of the godet box through the yarn group. On the other hand, through the inlet opening, a turbulent air flow is formed around the yarn group by the entrained air flow, which significantly affects the guide of the yarn and thus the riding of the yarn on the godet surface. Therefore, the present invention has the advantage that such adverse effects during the heat treatment of the yarn are avoided. That is, the entrained airflow generated by the yarn group is deflected as the freely guided yarns travel into and/or out of the godet box.

The device according to the invention has for this purpose an opening cross-sectional area of 10 mm ² per yarn to 20 mm ² per yarn at the inlet opening and/or the outlet opening. Such an open cross-sectional area, which is selected depending on the yarn fineness of the yarn, results in a significant limitation of air exchange and air turbulence.

In order to achieve a heat treatment which is as uniform as possible in each yarn of the yarn group, the yarns are preferably guided side by side and parallel to each other, 2 mm when running into and/or out of the godet box. Guided contactlessly through slits having slit heights in the range of ~5 mm. Correspondingly, the inlet opening and/or the outlet opening have slits with a slit height in the range from 2 mm to 5 mm. Therefore, a plurality of yarns can be guided through the godet box with stable yarn travel.

In order to obtain a relatively large degree of freedom for the non-contact guide, especially when yarn is fed, the size of the slits at the inlet opening and/or the outlet opening should be adjusted to feed the yarn group at the start of the process. Embodiments of the method of modification are advantageously implemented. Therefore, there is a possibility that the inlet opening provided in the godet box or the outlet opening provided in the godet box may be formed with a relatively large opening cross-sectional area. Due to the adjustability of the cross-sectional opening area at the inlet opening and/or the outlet opening, non-contact guidance of the yarn group can be ensured, depending on the respective operating conditions. Only in the operation in which the thread tension is configured in the thread group, the inlet opening or the outlet opening is adjusted to the smallest dimension of the opening cross-sectional area.

In the device according to the invention, a movable cover is associated with the inlet opening and/or the outlet opening, which cover is arranged between an operating position with a small opening and a yarn feeding position with a large opening. It is advantageously used in a mode in which it can be reciprocally moved.

In particular, in the slit-shaped opening cross section, the cover preferably has a closed edge. The closed edge extends parallel to the slit and is movable in a lateral direction orthogonal to the slit.

In order to keep the associated airflow away from the yarn inside the godet box even in the associated airflow generated by the peripheral velocity of the godet peripheral wall, the yarn must be moved in and out of the godet box during running and/or running. Advantageously, embodiments of the method for guiding with a small distance to the incoming and/or the outgoing metal sheet are respectively implemented.

For this purpose, a run-in thin metal plate for shielding the yarn guide path is correspondingly arranged in the godet box at the inlet opening, and the yarn guide path is provided in the godet box at the outlet opening. Correspondingly arranged striped metal sheets for shielding. Therefore, the yarns of the yarn group can be supplied to the peripheral surface of the godet facing the yarn run-in portion with stable yarn running.

Detachment of the thread group from the godet arranged corresponding to the outlet opening is preferably shielded by the free end of the strip of sheet metal, already on the peripheral surface of the peripheral wall of the godet. The strip of sheet metal extends next to the peripheral wall of the godet with short lateral spacing. Thus, the entry and exit of the yarn group is also supported, especially in the particularly narrow slits of the inlet opening and/or the outlet opening.

The method according to the invention will be described in detail below with reference to the accompanying drawings, with respect to some embodiments of the device according to the invention.

1 is a schematic front view of a first embodiment of a device according to the present invention. It is a figure which shows schematically the upper surface of embodiment shown in FIG. It is a figure which shows schematically the lower surface of the embodiment shown in FIG. FIG. 7 is a schematic front view of another embodiment of the device according to the present invention. FIG. 5 is a schematic diagram showing the lower surface of the embodiment shown in FIG. 4 in different operating states. FIG. 5 is a schematic diagram showing the lower surface of the embodiment shown in FIG. 4 in different operating states.

1 to 3 schematically show, from several perspectives, a first embodiment of the device according to the invention for drawing and drawing a plurality of freshly spun yarns. 1 shows the first embodiment in a front view, FIG. 2 shows the first embodiment as viewed from above, and FIG. 3 shows it as a view from below. The following description applies to all drawings unless explicitly associated with one of the drawings.

The first embodiment has four godets 1.1, 1.2, 1.3, 1.4 as a whole. These godets 1.1, 1.2, 1.3, 1.4 are arranged side by side in the yarn traveling direction and are held on the front side of the assembling wall 3. The godets 1.1 to 1.4 have projected godet peripheral walls 2.1 to 2.4, respectively. These godet peripheral walls 2.1 to 2.4 are held so as to project to the front side 21 of the assembling wall 3, and each one godet drive device 11 is arranged at the rear side 22 of the assembling wall 3. . 1 to 11.4. 2 and 3, the godet drive devices 11.1, 11.2 and 11.3, 11.4 are shown, and these godet drive devices 11.1, 11.2, 11.3 are shown. , 11.4 are connected to the godet peripheral walls 2.1 to 2.4 arranged on the front side 21 of the mounting wall 3.

As can be seen from the drawings of FIGS. 1 to 3, the projectingly held godet peripheral walls 2.1 to 2.4 are arranged in a godet box 4. The godet box 4 is held on the front side 21 of the mounting wall 3. In this case, the godet box 4 covers the protruding godet peripheral walls 2.1 to 2.4, and in this case, a rotatable door 8 is formed on the front side. This door 8 is connected to the godet box 4 via a swivel shaft 9 on one side and has a handgrip 10 on the side opposite to the swivel shaft 9.

In FIG. 1, the godet box 4 is shown in front view without a door. In the drawings of FIGS. 2 and 3, a godet box 4 with a closed door 8 is shown in operation.

As can be seen from the drawings of FIGS. 1 and 2, the godet box 4 has an inlet opening 5 in the upper surface 13. As a result, the yarn group 12 including a plurality of yarns that are guided side by side in parallel can be guided into the godet box 4 in a non-contact manner. The entrance opening 5 is formed as a slit 6 in the upper surface 13 of the godet box 4. The slit 6 is open toward the front side of the godet box 4 and is defined by the door 8.

As can be seen from the drawing in FIG. 2, the inlet opening 5 has a square opening cross section. The cross-sectional area of the opening is defined by the slit length L and the slit height S. The opening cross-sectional area of the inlet opening 5 varies from yarn to yarn in order to enable non-contact guidance of the yarn group 12 on the one hand and to achieve maximum deflection of the entrained airflow entrained around the yarn group on the other hand. It is limited to a range of 10 mm ² to 20 mm ^2. In this case, it was revealed that during operation the non-contact guide of the threads is guaranteed with a slit height in the range of 2 mm to 5 mm. Therefore, in a yarn group of a total of 6 yarns, a slit length L of 12 mm at the minimum and 60 mm at the maximum occurs. Therefore, such a limitation of the opening cross-sectional area of the inlet opening 5 provided in the godet box 4 prevents a large amount of external air from entering, so that the energy state in the godet box 4 is kept from any external air supply. Virtually unaffected. Furthermore, at the inlet opening 5, relatively large air turbulence inside the godet box 4 can be avoided.

FIG. 3 shows a view of the lower surface of the godet box 4 held by the mounting wall 3. An outlet opening 7 is formed in the lower surface 14 of the godet box 4. The outlet opening 7 is again formed as a slit 6 in this embodiment. The slit 6 is defined by the slit length L and the slit height S. The opening cross-sectional area of the outlet opening 7 defined by the slit 6 is formed in the same size as the opening cross-sectional area of the inlet opening 5 in this embodiment. To this extent, the slit height S, since the range of 2 mm to 5 mm, and the opening cross-sectional area in the range of yarns per 10 mm ² to 20 mm ^2, in the case of 6 yarns, slit length L is 12mm to It is in the range of 60 mm. As a result, particularly when the yarn group advances from the godet box 4, the entrained air is not largely discharged from the godet box 4. Thus, the environment within the godet box 4 remains substantially thermally isolated from the surroundings, which results in a particularly stable atmosphere within the godet box 4.

It should be emphasized that the cross-sectional area of the inlet opening 5 on the upper surface 13 and the cross-sectional area of the outlet opening 7 on the lower surface 14 are exemplary. Depending on the yarn guiding path in the melt-spinning process, the inlet opening 5 or the outlet opening 7 or both openings may be formed on the side of the godet box 4. Further, the opening cross-sectional areas of the inlet opening 5 and the outlet opening 7 may be formed to have different sizes.

The stability of the yarn guide path is also influenced in the godet box 4, mainly by the air flow generated by the rotation of the peripheral wall of the godet. In this case, heat loss does not occur, but the yarn guide path is affected when the yarn guide path runs on the surface of the godet peripheral wall and when it is separated from the surface of the godet peripheral wall. In this case, additional air turbulence may occur, especially at the inlet or outlet openings. This air turbulence threatens the non-contact guidance of the yarn groups at the smallest inlet and outlet cross sections.

FIG. 4 schematically shows another embodiment of the device according to the invention in a front view. In this embodiment, a plurality of godet peripheral walls 2.1 to 2.4 are similarly arranged so as to project into the godet box 4. The godet box 4 has an inlet opening 5 on the upper surface 13 and an outlet opening 7 on the lower surface 14. The inlet opening 5 is formed in a slit shape and may be formed according to the above-described embodiment.

The outlet opening 7 provided in the lower surface 14 of the godet box 4 is formed in the godet box 4 with a considerably large opening cross-sectional area. In this case, the lower surface 14 is provided with a movable cover (Blende) 18. This cover 18 serves to modify the free opening cross-sectional area of the outlet opening 7.

For a detailed description of the outlet opening 7 formed in the lower surface 14, reference is made to FIGS. 5.1 and 5.2.

5.1 and 5.2 show the lower surface 14 with the outlet opening 7. A movable cover 18 is held on the lower surface 14 of the godet box 4. The cover 18 can be moved using an actuator 20. The cover 18 has a closed edge 19. This closing edge 19 extends parallel to the slit edge 24 of the outlet opening 7.

FIG. 5.1 shows the operating state in which the yarn bundle is drawn, drawn and relaxed in the melt-spinning process. In this state, the opening cross-sectional area of the outlet opening 7 is reduced to the minimum dimension, so that the cover 18 is in the operating position. Therefore, the outlet opening 7 is substantially covered by the cover 18, and only the narrow slit is opened for advancing the yarn group.

The state at the start of the process is shown in FIG. In this state, the cover 18 is located at the yarn feeding position. In this case, the complete opening cross-section of the outlet opening 7 is open. The yarn bundle can be guided with a high degree of flexibility over a relatively large opening cross-sectional area of the outlet opening 7, so that the yarn feeding process, in particular for the trailing units, can be carried out without significant frictional contact. Only after the yarn bundle has been fed to the subsequent process unit, the cover 18 can be guided into the operating position in order to reduce the opening cross-sectional area of the outlet opening 7.

As shown in FIG. 4, in order to avoid unwanted air turbulence inside the godet box 4, the yarn group 12 is guided next to the run-in sheet metal 15.1 with a small spacing. The free end of this run-in thin metal plate 15.1 ends just before the godet peripheral wall 2.1 of the first godet 1.1. The run-in metal sheet 15.1 is arranged inside the godet box 4 immediately adjacent to the inlet opening 5.

In the embodiment shown in FIG. 4, the inlet opening 5 is correspondingly arranged with a second sheet metal sheet 15.2. This second metal sheet 15.2, together with the first metal sheet 15.1, forms a guide channel 23 for the yarn group 12. The free end of the second run-in thin metal plate 15.2 projects to the riding point of the thread group 12 on the godet peripheral wall 2.1. To that extent, the yarn group 12 is shielded and introduced into the godet box 4.

In the godet box 4, a discharge metal thin plate 16 is arranged corresponding to the outlet opening 7. The thread group 12 is guided with a small interval with respect to the surface of the running metal thin plate 16. The runaway metal sheet 16 extends from the outlet opening 7 to the godet peripheral wall 2.4. As long as this is the case, the yarns of the yarn group 12 are shielded and guided to the outlet opening 7 at the time of peeling from the godet peripheral wall 2.4. The thread interval of the thread group 12 with respect to the running metal thin plate 16 is in the range of 1 to 5 mm.

In the godet box 4, the yarns of the yarn group 12 are partially wound on the godet circumferential surface 2.1 to 2.4 with a partial winding of less than 360°, preferably in a range of 180° to 270°. Be guided. The godet peripheral walls 2.1 to 2.4 are heatable. In this case, the surface temperature can be varied differently depending on the yarn treatment requirements. Therefore, the temperature can be adjusted in the range of 40°C to 250°C. In particular, the drawing speeds achieved on the godet peripheral walls 2.3 and 2.4 are at most 3000 m/min to 5000 m/min. A yarn transition between the first godet peripheral wall 2.1 and the second godet peripheral wall 2.2 in order to shield the air flow generated by the godet peripheral walls 2.1-2.4 against the yarns of the yarn group. In the section, a first shielding metal sheet 17.1 is arranged. This first shield metal veneer 17.1 is such that the yarn is between the first godet peripheral wall 2.1 and the second godet peripheral wall 2.2 with respect to the surface of the first shield metallic plate 17.1. It is held at an angle between the first godet peripheral wall 2.1 and the second godet peripheral wall 2.2 so that it can be guided with a small distance.

A second shield metal sheet 17.2 is provided for another shield. The second shielding metal sheet 17.2 shields the yarn transition between the second godet peripheral wall 2.2 and the third godet peripheral wall 2.3. The third shielding sheet metal 17.3 extends between the third godet peripheral wall 2.3 and the fourth godet peripheral wall 2.4. The shielding metal sheets 17.1 to 17.3 are in this case held at one end in the godet box 4 and at each free end project into the guide section between the godet peripheral walls. In this case, the free ends of the shielding thin metal plates 17.1 to 17.3 are terminated with a small space before the threading point of the thread group on the peripheral surface of the godet peripheral wall.

The embodiment of the device according to the invention illustrated in FIG. 4 therefore provides a yarn group with a plurality of yarns, which may contain 8, 16 or more yarns, with high running stability and evenness. It is particularly advantageous for heating and stretching.

Claims (11)

A method of drawing and drawing a plurality of just-spun yarns, wherein the yarns together as a yarn group are guided in the peripheral surface of a plurality of driven godet peripheral walls, which are arranged in a godet box, Yarn is introduced into the godet box through at least one inlet opening and is discharged from the godet box through an outlet opening ,
Said accompanying airstream formed by yarn group, Ru is deflected freely when the yarn is guided to the godet box infeed and / or when rushed out from the godet box, in the method,
The yarn by the entering port opening (5) infeed metal sheet extending to said godet peripheral wall of the first godet in the running direction of the yarn from (15.1), and / or from the previous SL outlet opening (7) A method for drawing and drawing a plurality of freshly spun yarns, characterized in that the yarn guiding path is shielded by a running metal sheet (16) extending to the said godet peripheral wall of the last godet in the direction of travel . The method according to claim 1, wherein the yarns of the yarn group are guided in parallel and are guided in a non-contact manner during the running and/or the running through a slit having a slit height in the range of 2 mm to 5 mm. Method according to claim 2, characterized in that the size of the slits provided in the inlet opening and/or the outlet opening is changed in order to feed the yarn group at the beginning of the process. The method according to claim 1, wherein the yarn is guided in the godet box at a distance of 1 to 5 mm with respect to the sheet metal to be jetted during the jetting. A device for drawing out and drawing a plurality of just-spun yarns, comprising a plurality of godets (1.1 to 1.4), and a drivable godet peripheral wall (1.1 to 1.4) of the godets (1.1 to 1.4). 2.1-2.4) are arranged in a godet box (4), the godet box (4) having at least one inlet opening (5) and at least one outlet opening (7). a has,
Said inlet opening (5) and / or the outlet opening (7) for guiding the yarn in a non-contact, each thread ^has an opening cross-sectional area in the range of 10 mm 2 to 20 mm ^2, device At
It said inlet opening the godet peripheral wall of the running direction of the yarn (5) first of said godet (1.1) (2.1) infeed metal sheet extending to (15.1) has not been placed that, and / or the outlet opening (7) rushed out metal sheet which extends the godet to peripheral wall (2.4) of the last of the godet (1.4) in the running direction of the yarn from (16) is placed A device for drawing and drawing a plurality of freshly spun yarns. 6. Device according to claim 5, wherein the inlet opening (5) and/or the outlet opening (7) comprises a slit (6) with a slit height (S) in the range of 2 mm to 5 mm. 7. Device according to claim 5 or 6, characterized in that the inlet opening (5) and/or the outlet opening (7) are adjustable in size of their cross-sectional opening area. A movable cover (18) is associated with the inlet opening (5) and/or the outlet opening (7), the cover (18) having an operating position with a small opening and a large opening. 8. The device according to claim 7, which is movable to and from a yarn feeding position. The cover (18) has a closing edge (19), which closing edge (19) extends parallel to the slit edge (24) of the outlet opening (7). The device according to claim 8, which is formed so as to be movable with respect to (24). The run-in metal sheet (15.1) has a free end in the godet box (4), the free end in the running direction of the yarn being the first godet (1.1). of the godet to the circumferential wall (2.1) extends at an end interval, apparatus of any one of claims 5 to 9. The runout sheet metal (16) has a free end in the godet box (4), the free end being the godet peripheral wall of the last godet (1.4) in the running direction of the yarn. 11. A device according to claim 10, which extends laterally to the next of (2.4).

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