EP1115922A1

EP1115922A1 - Thread oiling

Info

Publication number: EP1115922A1
Application number: EP99940155A
Authority: EP
Inventors: Ulrich Enders; Hans-Gerhard Hutter; Hansjörg MEISE; Roland Nitschke; Detlev Schulz; Peter Senge; Dieter Wiemer
Original assignee: Barmag AG; Barmag Barmer Maschinenfabrik AG
Current assignee: Oerlikon Barmag AG
Priority date: 1998-08-07
Filing date: 1999-08-05
Publication date: 2001-07-18
Also published as: WO2000008242A1

Abstract

The invention relates to a device for melt-spinning filaments into a thread consisting notably of polyester, polyamide, polypropylene or such like. Said device comprises a spinning nozzle arranged on a spinning head (2) from which the filaments can be transported via a cooling channel (4) into a collecting chamber (3). The thread constituted by the filaments can be moved through an oiling device (5) for improving its gliding friction properties. From the oiling device (5) the thread is moved to a treatment zone (16) and from there to a take-up spool (8). According to the invention the oiling device (5) is positioned in front of or inside the collecting chamber (3), in the direction of travel of the thread.

Description

description

Thread preparation

The invention relates to a device for melt spinning filaments into a thread according to the preamble of claim 1

From WO 95/15409 a device and a method for melt spinning filaments into a thread are known. In the melt spinning process or the device described, filaments are extruded from a spinning head via a spinneret. These filaments are conveyed from a receiving chamber into a cooling channel, on which a collection chamber follows, to which a vacuum device is connected, which generates a corresponding vacuum in the cooling channel, so that air is sucked into the receiving chamber connected to the spinneret and a flow of cooling air is generated on the surface of the filaments in the direction of travel, at the bottom of the collection chamber an outlet opening is provided through which the filament bundle forming the thread emerges. After the filament bundle has emerged from the collecting chamber through the outlet opening provided therein, the thread is prepared. The preparation of the thread serves to improve its sliding properties ten to improve to avoid filament breaks, thread breaks, electrostatic charges and thus a reduced thread quality in the subsequent winding process or further processing

Due to the vacuum device, which sucks the cooling air from the cooling channel through the collection chamber, a flow into the interior of the collection chamber occurs at the outlet opening of the thread from the collection chamber, ie the flow at the outlet opening is directed against the direction of travel of the thread After exiting the collecting chamber, the thread is brought into contact in a preparation device with an agent containing at least 01 in order to improve its friction properties for the further processing process. The preparation device is followed by a treatment zone in which, for example, two godets are arranged, the godet of which is arranged first in the thread running direction has a lower speed, while the second godet arranged downstream in the thread running direction has a correspondingly higher speed or speed. Working speed, so that the thread is stretched by these two godets in a defined stretching ratio, which essentially determines the quality of the thread. Further treatments of the thread, such as heat treatment, relaxation, etc. can be arranged in the treatment zone. A part of the treatment zone is a swirl jet, in which the thread closure is produced. After leaving the treatment zone, the thread is wound onto a spool by means of a traversing device known per se

The disadvantage of the known device described is that the unprepared thread can strike the relatively small outlet opening of the collecting chamber. The fastening is supported, inter alia, by the fact that a secondary flow against the thread running direction occurs in the collecting chamber in this region or of filaments of the thread leads to thread damage, which has a disadvantageous effect on the quality of the thread. A possible striking of the filaments of the thread is also favored by the fact that the thread as it exits the cooling channel and as it passes through the collecting chamber due to the prevailing flow conditions in the air outlet zone is made to vibrate

The invention is therefore based on the object of a device for

Melt spinning filaments to create a thread by means of which a

Damage to the unprepared thread is avoided in particular in the area of the outlet opening of the collecting chamber and by means of which a quiet one Thread run at exit from the cooling channel and pass through the collection chamber is reached

In the device for melt spinning filaments into a thread, in particular made of polyester, polyamide (polycondensates), polypropylene or the like, the filaments are discharged from a spinneret on a spinning head into a channel which flows into a collecting chamber a preparation device in which the application of a thread lubricant - for example an oil - improves its sliding friction properties and thus its tendency to break threads, and a treatment zone is fed to a take-up spool. According to the invention, the preparation device is arranged in the thread running direction in front of or within the collecting chamber after the individual filaments in the area of the end of the cooling channel or the entry into the collection chamber have been brought together to form a thread, the unprepared thread is brought into contact in the preparation device with a means which, in particular, ndest contains components from 01, which makes the thread less sensitive to friction

By arranging this preparation device in the air outlet zone of the cooling channel, the disadvantages of devices of the prior art are largely avoided, because by preparing the thread in the suction chamber even before it emerges into the ambient air, the filaments of the thread or of the thread at the edge of the outlet opening of the collecting chamber is substantially avoided. The thread can thus be guided very precisely through the outlet opening of the collecting chamber. In addition, the bundled prepared thread is less sensitive to turbulent flow effects in the immediate exit region of the thread from the collecting chamber

According to a preferred embodiment, the preparation device is arranged directly in the outlet opening of the collecting chamber. The main advantage An arrangement of the preparation device directly in the outlet opening of the collection chamber is that the preparation device serves as a sealing element in addition to its function to prepare the thread. With the arrangement of the preparation device directly at the outlet of the collection chamber, the outlet opening can be reduced, which also reduces the tendency that secondary air is sucked into the collecting chamber counter to the running direction of the thread emerging from the collecting chamber. The air entering the collecting chamber from the cooling duct is discharged by means of the vacuum device

In order for the thread to run as stable and quiet as possible during the preparation, according to a particularly advantageous development of the invention, the preparation device is arranged within an air-permeable sifting cylinder. The sieve cylinder within the collection chamber causes the flow to be equalized when the cooling air is removed.Therefore, no significant flow effects occur for deflecting or stimulating the thread to this zone is therefore particularly preferably suitable for preparing the thread according to the invention

A further improvement in the stability of the thread flow within the air outlet zone is achieved by the advantageous embodiment of the device according to the invention, in which the preparation device is arranged within an outlet cone, through which the collecting chamber is connected to the cooling channel. The thread is prepared before it enters the collecting chamber The outlet cone is particularly advantageously designed in such a way that its flow cross-section increases in the thread running direction. This results in an expansion of the air conducted in the cooling channel, so that the air emerging from the cooling channel enters the collecting chamber at a lower flow rate

To apply a thread lubricant to the thread, the preparation device is preferably designed as a preparation pin For this purpose, the preparation pin has a thread guide groove guiding the thread. A channel opens into the guide groove, which channel is connected to a metering device and through which the thread lubricant exits in the guide groove

The preparation pin is advantageously held in a cantilever manner in a wall of the collecting chamber or the outlet cone, so that a straight thread run can be carried out without substantial deflection

According to a preferred embodiment of the invention, the preparation device has a preparation nozzle with a thread channel, which extends essentially in the thread running direction. A channel ends in the thread channel, through which a thread lubricant is fed in order to improve its frictional properties fed that the thread entrains a quantity of thread lubricant required for thread preparation as it passes the outlet opening of the channel. However, it is also possible for the thread to sweep over a specially shaped surface to which the corresponding quantity of thread lubricant is supplied

In order to be able to easily insert the thread into the preparation nozzle, it has a slot running in the direction of the thread channel

In order to facilitate the introduction of the thread, the preparation device is advantageously displaceable in the thread running direction and / or transversely to the thread running direction or also removable from the collecting chamber, for example in order to insert the thread through the slot into the thread channel of the preparation nozzle and then again the preparation device either in the Push in the area of the opening or, if the preparation device is arranged inside the collecting chamber, to move it through the opening of the collecting chamber or a side wall of the collecting chamber Further advantages, features and possible applications of the invention will now be explained in detail using an exemplary embodiment with reference to the accompanying drawings

Show it

1 shows a basic sectional view of a spinning station with a preparation device integrated in the collecting chamber according to a first exemplary embodiment of the invention,

2 shows a spinning station with a preparation device arranged at the outlet from the collecting chamber according to a second exemplary embodiment of the invention,

Fig. 3 shows a section of a spinning station with another

Embodiment of the invention,

Fig. 4 1 is a sectional view through a preparation device according to the invention, and

4 2 shows a sectional view according to a sectional plane A-A according to FIG. 3 1

1 shows a basic sectional view of a spinning station, in which, according to the invention, the preparation device is arranged in the interior of the collecting chamber. A spinning head 2 of the spinning station is provided with a spinneret (not designated). A number of filaments are transferred from the spinning head 2 into a chamber via the spinneret extruded, which is surrounded by a gas-permeable wall 11, through which cooling air is sucked in. The cooling air is symbolically represented in its direction of flow by the arrows indicated in FIG. 1. The chamber with the gas-permeable wall 11 closes there is an inlet cone 12 in which the filaments 1 are converged in the direction of an adjoining cooling channel 4. The cooling channel 4 flows through an outlet cone 13 into a collecting chamber 3. To calm the flow, the collecting chamber 3 has a sieve cylinder 14 in its interior 3, a vacuum device 7 is connected, by means of which the cooling air 10 is given a flow rate through the gas-permeable wall 11, through the inlet cone 12 and through the cooling channel 4 into the collecting chamber 3 via the outlet cone 13, which at least in the cooling channel 4 is essentially the filament running speed This ensures that the resistance between the running filaments and the cooling air 10 surrounding them is kept negligibly small

The individual filaments are converged such that their point of convergence is arranged above a preparation device 5 arranged in the interior of the collecting chamber 3. The thread 6 constructed from the filaments 1 thus enters the preparation device 5

In the preparation device 5, a thread lubricant is supplied to the thread at a constant running speed, which causes the sliding friction property of the thread to be improved and electrostatic charges to be suppressed. This prevents thread breaks, filament breaks or loops in the subsequent processing process of the thread. Furthermore, the preparation of the thread carries with the thread lubricant so that when the thread passes through the outlet opening 9 from the collecting chamber 3, striking the thread on the inner edge of the outlet opening is largely avoided. The filaments adhering relatively to one another after leaving the preparation device 5 can also become turbulent due to flow turbulence In the immediate area of the outlet opening 9 of the collecting chamber 3, no longer put it down from the longitudinal axis of the thread fed to the preparation device The dosing device is preferred arranged outside the collecting chamber 3 and connected to the preparation device via a line.

After leaving the suction chamber 3, the thread passes through a treatment zone 16, in which, for example, a heat treatment, a relaxation or also a swirl nozzle 17 can be arranged to achieve the thread closure. The treatment zone 16 is followed by the winding device, which consists of a traversing device forming a traversing triangle 18 , a pressure roller 19 and a coil 8

FIG. 2 shows a spinning station with a preparation device 5 arranged in the exit region of the thread from the collecting chamber in accordance with a second exemplary embodiment of the invention. The basic structure and function of the spinning station corresponds to that which has already been described in detail in connection with FIG. 1. An essential difference compared to the exemplary embodiment described in FIG. 1 is that the preparation device, which corresponds in its function to that described in connection with FIG. 1, is arranged in the immediate outlet area, ie in the outlet opening 9 (see FIG. 1) of the collecting chamber 3 . An essential advantage of such an arrangement is that the preparation device itself acts as a kind of seal, which prevents or limits that large quantities of secondary air flow into the collecting chamber 3 against the thread running direction by sucking the cooling air 10 by means of the vacuum device 7 is thus contributed at least to a reduction in the turbulent flow conditions in the immediate exit region of the thread from the collecting chamber 3. The thread 6 then passes from the preparation device 5 into the treatment zone 16. A first godet 15 and a second godet 20 are arranged in the treatment zone 16. The first godet 15 has a suitable low speed or working speed. The second godet 20, on the other hand, has a correspondingly higher working speed. The thread quality is determined by the ratio of the speeds or working speeds of the two godets 15, 20 to one another. litat thereby significantly influenced or set as desired by adjusting the speed of the second godet 20 so that a defined stretching ratio is achieved. In an analogous manner to the design described in FIG. 1, the two godets are followed by a swirl nozzle 17

From the treatment zone 16, the thread 6 finally arrives at a winding point, which is provided by means of a traversing device producing a traversing triangle 18, a pressure roller 19 and a bobbin 8.

In Fig. 3, a section of a device according to the invention is shown schematically. The spinning device differs from the spinning devices described in FIGS. 1 and 2 only in the arrangement and design of the preparation device. In this case, only the relevant section of the spinning device was shown in FIG. 3 Thread guidance before and after the cutout is designed, for example, as in FIG. 1 or as shown in FIG. 2. In this regard, reference is made to the preceding description

3 shows the end of the cooling channel which is formed by the outlet cone 13. The outlet cone 13 is connected to the collecting chamber 3, the collecting chamber 3 having an inlet opening which essentially corresponds to the flow cross section at the outlet of the cone 13. Inside the collecting chamber 3 an air-permeable sieve cylinder 14, which surrounds the thread 6, is introduced, which essentially has the flow cross-section of the inlet opening. An opening for discharging the cooling air is formed on the side of the collecting chamber 3. At the opening of the collecting chamber 3, the vacuum device 7 is connected via a line

On the outlet side of the collecting chamber 3, the outlet opening 9 is provided, through which the thread 6 leaves the collecting chamber 3. A thread guide 33 is arranged within the outlet opening 9 To apply a thread lubricant to the filament bundle 1, a preparation device 5 is arranged within the outlet cone 13. The preparation device 5 is designed here as a preparation pin 30. The preparation pin 30 has a guide groove 31 at the end protruding into the interior of the cooling shaft, in which the thread 6 A channel 22 of the preparation pin 30 flows into the guide groove 31. The channel 22 is connected to a metering device 23 via an elastic line 32. The metering device 23 is in turn connected to a thread lubrication container 24

The preparation pin 30 is arranged in the wall of the outlet cone 13. For this purpose, the outlet cone 13 has a receptacle which enables the preparation pin 30 to be displaced transversely to the thread running direction without secondary air being able to enter the cooling shaft from the outside To facilitate threading

In the embodiment of the invention shown in FIG. 3, a thread lubricant, for example an oil / water emulsion, is removed from the container 24 by the metering device 23 and fed in a metered form to the preparation pin 30. The thread lubricant passes through the channel 22 into the guide groove 31 of the preparation pin 30 The thread lubricant is absorbed by the thread in the groove

The pen preparation shown as an example can also be used very well in the exemplary embodiment of the invention from FIG. 1

In FIG. 4 1, a further exemplary embodiment of a preparation device 5 is shown in a basic sectional view in the direction of the thread running direction. Here, the preparation device 5 is designed as a preparation nozzle 26 for preparing the thread. The thread 6, which is combined from the individual filaments 1, runs through a thread channel 21 of the preparation nozzle 26 A channel 22 opens into the thread channel 21, via which a thread lubricant by means of a suitable Metering device 23 is fed from a thread lubricant container 24 The dimension of the channel 22 or the setting of the metering device 23 are dimensioned such that the amount of thread lubricant required for a defined thread running speed for the preparation of the thread is supplied

The preparation nozzle 26 has a slot 25 which extends in the thread running direction and extends from the outside of the preparation nozzle 26 to the thread channel 21

4 2 shows a sectional view through the sectional plane A-A according to FIG. 4 1. It can be seen that the slot 25 extends from the side of the preparation nozzle 26 to the thread channel 21. The channel 22 is also indicated by a dashed line

The invention is not restricted to a specific shape of the cow device shown in FIGS. 1 and 2. The cooling channel is preferably formed by a tube in which a bundle of filaments is guided. For this purpose, the elements connected to the cooling channel are preferably cylindrical. However, these embodiments are exemplary and can easily be replaced by oval shapes or, in the case of rectangular spinnerets, even by square shapes.

The spinning device according to the invention is suitable for producing textile thread or technical thread made of polyester, polyamide or polypropyline. Various treatment devices for the thread can be connected downstream, for example a fully stretched thread (FDY), a pre-oriented thread (POY) or a highly oriented thread ( HOY)

Claims

Device for melt spinning filaments (1), in particular made of polyester, polyamide (polycondensates), polypropylene or the like, which can be requested from a spinneret on a winding head (2) in a cooling channel (4) opening into a collecting chamber (3) and becomes a thread (6) can be summarized, which can be guided via a preparation device (5) and via a treatment zone (16) to a take-up reel (8), characterized in that the preparation device (5) in

Thread running direction is arranged in front of or within the collecting chamber (3)

Apparatus according to claim 1, characterized in that the preparation device (5) is arranged directly in an outlet opening (9) of the collecting chamber (3) provided for the thread exit, the collecting chamber (3) for removing the cooling air flowing out of the cooling channel (4) is connected to a vacuum device (7)

Apparatus according to claim 2, characterized in that the preparation device (5) seals into the outlet opening of the

The collecting chamber (3) is installed in such a way that secondary air does not essentially enter the collecting chamber (3) through the outlet opening (9) due to the suction of cooling air (10) from the collecting chamber (3)

Device according to one of claims 1 to 3, characterized in that the preparation device (5) is arranged within an air-permeable sieve cylinder (14) which penetrates the collecting chamber (6) in the thread running direction from the entry side to the exit side and which surrounds the filaments / the thread Apparatus according to claim 1, characterized in that the

Preparation device (5) is arranged within an outlet cone (13) through which the collecting chamber (3) is connected to the cooling channel (4)

Device according to claim 5, characterized in that the outlet cone

(13) has an increasing flow cross-section in the thread running direction

Device according to one of the preceding claims, characterized in that the preparation device (5) has a preparation pin

(30) with a guide groove (31) guiding the thread (6) into which a channel (22) for supplying thread lubricant for preparing the thread (6) opens

Apparatus according to claim 7, characterized in that the

Preparation pin (30) is held projecting in a wall of the collecting chamber (3) or the outlet cone (13)

Device according to one of claims 1 to 8, characterized in that the preparation device (5) has a preparation nozzle (26) with a

Has thread (6) guiding thread channel (21) into which a channel (22) for supplying thread lubricant for preparing the thread (6) opens

Device according to claim 9, characterized in that the preparation nozzle (26) runs in the direction of the thread channel (21)

Has slot (25) through which the thread (6) can be inserted into the thread channel (21)

Device according to one of claims 1 to 10, characterized in that the preparation device (5) in the thread running direction and / or transverse to

Thread running direction is displaceable

2. Device according to one of the preceding claims, characterized in that the cooling channel (4) is formed by a tube which has a narrowest cross section in the inlet region of the filaments (1).