GB2041018A

GB2041018A - False Twist Draw Texturising Machines

Info

Publication number: GB2041018A
Application number: GB8003362A
Authority: GB
Original assignee: Zinser Textilmaschinen GmbH
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 1979-01-31
Filing date: 1980-01-31
Publication date: 1980-09-03
Also published as: IT8019429A0; JPS55107528A; FR2447984A1; DE2903523A1; IT1129783B; FR2447984B3

Abstract

A false twist draw texturising machine has a melt spinning device (21) for melt spinning of endless yarns (29) which are to be drawn and false twisted on the machine without intermediate spooling. Cooling zones (25) for air or gas cooling of the yarns are disposed downstream of the spinerettes or spinerette plates (23) which deliver the yarn and at least one section (26) for drawing the yarns is disposed downstream of each of the cooling zones (25). <IMAGE>

Description

SPECIFICATION Improvements in or Relating to False Twist Draw Texturising Machines The invention relates to false twist draw texturising machines.

Hitherto, false twist draw texturising machines were always provided with a bobbin creel for the monofil or multifil yarns which were wound on supply packages and had to be drawn and false twisted on this machine. The supply packages had been prepared on separate, multi-deck melt spinning systems which are provided with melt spinning devices and yarn take-up winding devices for taking up the endless yarns produced by them. Where appropriate, it is also possible for such melt spinning systems to be used for partial drawing of the yarns in which case residual part drawing of the endless yarns had to be performed on the false twist draw texturising machine.

Partial drawing in this context means that total drawing is divided into two different draw operations, namely preliminary or rough drawing and finish drawing.

It was possible to operate with the maximum possible thread delivery rates by winding the yarns at the melt spinning systems into supply reels. However, package changing at the take-up winders and subsequent transportation of the supply packages and mounting of the latter on the package holders of the false twist draw texturising machine involves costs and a substantial expenditure of time. Moreover, every take-up and pay-off winding of the yarn results in a reduction of the yarn quality and furthermore, the space required for accommodating such plants extends over several storeys of a building.

According to the invention, there is provided a false twist draw texturising machine for endless yarns, comprising a plurality of false twist sections, each having a false twist element and each of which is provided for false twisting of one yarn, and a number of yarn wind-up stations corresponding to the number of false twist sections for winding up the false twisted yarns into packages, there being provided a melt spinning device for melt spinning the yarns which are to be drawn and false twisted on the machine, and cooling zones for air or gas cooling of the yarns disposed downstream of individual spinerettes or a spinerette plates for delivering the individual yarns to be false twisted, at least one zone for drawing the yarns being disposed downstream of each of the cooling zones.

It is thus possible to reduce the cost of such machines and to reduce their space requirements.

Such a false twist draw texturising machine represents a new kind of machine which can be described as a false twist spinning draw texturising machine since it incorporates a melt spinning device, so that it is possible for the yarns to be spun from the plastics molten compound and to be immediately drawn and false twisted on this machine. The take-off speed of the yarns from the spinerettes or spinerette plates in this machine depend on the possible feed rate of the yarns determined by the false twisting operation and taking into account the required draw so that in general it is not possible to reach the very high yarn delivery speeds possible with conventional melt spinning machines but substantial advantages are nevertheless achieved which overcome this one disadvantage.For example, the yarn quality can be improved since the yarns need be wound for the first time only after false twisting, thus dispensing with the previously needed take-up winding and pay-off winding operation. Costs are also reduced by the absence of the hitherto required yarn take-up winding devices of the melt spinning machines and of the bobbin creels associated with the false twist draw texturising machines as well as transportation previously required for the supply packages and substantial savings of manufacturing space are also achieved. Operating personnel is also saved.

Owing to the lower yarn feed rates in the cooling zones the latter can also be made shorter than hitherto.

The yarns which can be produced by such a machine can be any desired monifil or multifil endless yarns which can be produced by melt spinning, more particularly multifil yarns which can be crimped by false twisting. The false twist imparted to the yarns in the false twist sections should be thermally fixed. Heating systems which heat the filaments in the false twist sections are required to this end.

The yarns can be those produced more particularly from thermoplastic polymers such as polyethylene, polyamide, polyester or the like. In principle, the melt spinning device can be constructed in any known manner but preferably, a tank containing the hot molten compound extends along the longitudinal orientation of the machine approximately over its working range.

Working range refers to the range of the machine in which the yarns are spun and treated and are finally wound up. The molten compound to be spun can be obtained in conventional manner, for example as in the grid spinning process. The compound is pumped from the tank by means of spinning pumps and is delivered without bubbles through filtering devices to the spinerettes or spinerette plates and is extruded through the apertures thereof.

The required drawing of the yarns to normally three times to five times their length can be performed in separate draw sections and/or in the false twist sections.

In general it is particularly advantageous if the yarns pass from the spinerettes or spinerette plates of the melt spinning device at first approximately vertically downwards through cooling zones and are then advantageously reversed into an upward direction after preceeding drawing, approximately again to the height of the melt spinning device and in the upward direction to the inlet yarn delivery mechanisms of the false twist sections which conveniently extend over one or more access walks transversely over the relevant access walk.

Thereafter the yarns pass from the exit delivery mechanisms of the false twist sections to the yarn take-up winding devices where they are wound up and which are disposed on the second side of the relevant access walk. The yarn passages and all operating elements co-operating in the treatment and spinning of the yarns can thus be particularly advantageously operated and any defects or malfunctioning can be particularly easily and rapidly remedied.

The invention will be further described, by way of example, with reference to the accompanying drawings, in which: Figures 1 and 2 show in substantially diagrammatic form partial end views of singledeck false twist draw texturising machines constituting first and second embodiments of the invention, individual parts being shown either in sectioned or fractionated form.

Parts which correspond to each other or can correspond to each other in the drawing are provided with the same reference numerals.

The false twist draw texturising machine 10 shown in Figure 1 comprises a main frame 11, substantially of U-shaped in end view, consisting of two vertical external frames 12, 13 and ceiling cross girders 14 which interconnect the frames 12, 1 3 at the top. Yarn take-up winding devices 16 and 17 are disposed on the external frames 12, 1 3 with four rows of cheese winding devices 1 6 in four vertically superjacent decks on the lefthand external frame 12 and three rows of thread take-up winding devices disposed vertically superjacent in three decks on the right-hand external frame 13, the last-mentioned winding devices being constructed as so-called side winders, whose construction is described in the German Offenlegungsschrift 2 651 816 by Messrs. Dupont of Canada.Since the side winders 17 as well as the cheese winder devices 16 are of known construction, they do not require any detailed description.

Although the yarn take-up winding devices on the left-hand and right-hand machine sides in this embodiment are illustrated as being of a different construction it will be evident that in practice it is convenient to provide yarn take-up winding devices of the same kind of both sides, i.e., for example cheese winding devices or side winders on both sides. In this case the machine can be constructed symmetrically with respect to its longitudinal middle plane 15, a feature which is particularly advantageous.

In the exemplified embodiment illustrated in Figure 1 a vertical middle frame 1 9 which, like the two vertical external frames 12, 13, is placed on the floor 18 of the machine shed in question and centrally supports the ceiling cross girders 14, extends along the longitudinal middle of the machine. Shorter cross girders 20 are mounted at a short distance beneath the ceiling cross girder 14 of the middle frame 19 and a spinning device 21 extending approximately over the working range of the machine 10 in its longitudinal orientation, i.e. perpendicularly to the plane of the illustration, is mounted on the cross girders 20.

The spinning device is provided with a circular cylindrical tank 22 which extends approximately over the length of the aforementioned working range and advantageously contains the molten compound of thermoplastic, molten synthetic material in the molten state or supplied to said tank in the molten condition, more particularly retained in the tank under the exclusion of air and kept at a constant temperature by heating or supplied to said tank in already molten condition and to be spun into yarns 29. On each of the two longitudinal sides of the tank 22 there is disposed a row of spinerettes (if monofil yarns 29 are spun) or a row of spinerette plates 23 (if multifil yarns 29 are spun) as well as spinning pump units which deliver the hot molten compound in metered amounts to the spinerettes or spinerette plates 23 for extrusion through the apertures thereof.The longitudinal orientation of the machine 10 extends perpendicularly to the plane of the illustration and accordingly the two rows of spinerettes or spinerette plates 23 as well as all the remaining rows of operating elements (such as yarn delivery mechanisms, etc.) also extend perpendicularly to the plane of the illustration. In the direction of viewing Figure 1 a plurality of yarn paths are therefore provided in two rows on both sides of the longitudinal middle plane 15 of the machine 10 of which those at the front can be seen.

At a vertical distance beneath each spinerette or spinerette plate 23 there is disposed a first yarn delivery mechanism 24, which can comprise a godet roll with an associated transverse roll or a driven roller and a contact roller pressed thereon and arranged to take up the relevant yarn from the relevant spinerette or spinerette plate 23 at a constant speed rate. The vertical zones through which the two yarns 29 pass from the spinerettes or spinerette plates 23 to the associated first yarn delivery mechanisms 24 in the downward vertical direction form cooling zones 25 in which the yarns 29 are sufficiently cooled so that they cannot be damaged by the first yarn delivery mechanisms 24. Conveniently, the length of the cooling zone 25 can be approximately 1.5 to 3 m.

The cooling zone can be formed merely by the room air of the relevant machine shed or provision can be made for blowing cooling air or cooling gas on to the yarns 29 in the said cooling zones to accelerate cooling, or the yarn can pass through cooling shafts through which cooling air or other cooling gas is blown.

The two rows of first yarn delivery mechanisms 24, which extend perpendicularly to the plane of the illustration, also form the two rows of inlet delivery mechanisms associated with vertically downwardly extending draw sections 26 in which the yarns 29 are stretched to normally 3 to 5 times their original length in order to achieve their high strength. Exit-side second yarn delivery mechanisms 27 of the said draw sections 26, as well as ail other thread delivery mechanisms of the machine, can also be of conventional kind, for example godet rolls with associated traverse rolls.

The second thread delivery mechanisms 27 are disposed at a relatively short distance of, advantageously, 10 to 30 cm above the floor of the machine shed and conduct the yarns 29 in steep upwardly extending directions to third yarn delivery mechanisms 30 which form the inlet side yarn delivery mechanisms 30 of substantially horizontally extending false twist sections 31 in which the yarns 29 are heated in known manner by heating systems 32 and the false twisted by false twisting elements 33 of conventional construction.Exit-side yarn delivery mechanisms 34 associated with the aforementioned false twisting sections 31 are disposed at a short distance beneath the ceiling cross girder 14 or on the right-hand external frame 1 3 and guide the yarns 29 vertically downwardly where they pass to the thread take-up winders 1 6, 1 7 where they are wound into packages. The false twist sections 31 are substantially rectilinear, a feature which is advantageous in the interests of uniform distribution of the false twist, but they can also have a different configuration. All yarn delivery mechanisms are power driven.

The path of each individually produced yarn 29 therefore extends from the spinerette or spinerette plate 23, which spins it, initially vertically downwards through a cooling zone 25 then through an adjoining downwardly extending draw section 26. Thereafter the yarn is reversed at a steep upward angle from the draw section and close to the ceiling cross girder 14 of the machine it passes into the approximately horizontally extending false twist section 31. After leaving the false twist section it passes vertically downwards and then to a thread take-up winder 16 or 1 7 which winds the yarn.On each of the two sides of the middle frame 19 having the melt spinning device 21 , the cooling zones 25 and the draw sections 26, the machine is provided with an access walk 35, with the middle frame 1 9 disposed on the inside of each of the two access walks 35 and the yarn take-up winders 16 or 17 disposed in a plurality of decks on the outside of each of the said two access walks. A compact construction of the machine 10 with convenient operation of all of its elements and of the yarns 29 is obtained in this manner. Furthermore, a single tank 22 is sufficient for both rows of spinerettes or spinerette plates 23.In practice, the machine 10 therefore corresponds to two directly adjacently disposed machines of this kind but different parts and prime movers and controls not shown are common to both so that costs and space are saved and operation and maintenance is simplified.

It should be pointed out that the right-hand half of the machine illustrated in Figure 1 is shown in partially fractionated form. Furthermore, the yarn passages near the yarn take-off winding devices are only partially shown. It is eivdent that each yarn 29 passes to the yarn take-up winder 1 6, 1 7 associated therewith.As regards the left hand side of the machine with the cheese take-up winding devices, it is particularly convenient if ail yarns pass from the left-hand yarn delivery mechanisms 34 vertically downwards along heaters 50, which heat the yarns for heat setting, to a single bottom row of yarn delivery mechanisms 36 which are situated close to the floor 1 8 and from there pass in an approximately horizontal path beneath the bottom row of yarn take-up winders to yarn reversing elements 37 from where the yarn passes vertically upwards to the yarn take-up winders 1 6.

Advantageously the machine 10 can simultaneously spin, draw and false twist several hundred yarns. The machine can have a width of, for example, 7 to 9 m and its length, perpendicularly to the plane of the illustration can be, for example, 10 to 30 m.

Dressing applicator devices 38, 39 are associated with the yarn passages. For example, dressing applicator devices 38 for applying antistatic dressings or the like to the yarn 29 are disposed in the cooling zones 25. Dressing applicator devices 39 for applying oil or the like precede the yarn take-up winders.

The machine 10' according to Figure 2 differs from that of Figure 1 substantially in the following ways.

Draw sections 60, extending from the yarn delivery mechanisms 24' to yarn delivery mechanisms 30 are provided on the middle frame 19 of the main frame 11 and in addition the yarns can be subjected to past-drawing in the false twist sections 31 which also extend at the top transversely over the access walk 35. A single row of first yarn delivery mechanism 24 is therefore disposed at a vertical distance beneath each of the two rows of spinerettes or spinerette plates 23 and said yarn delivery mechanisms take off the yarns 29 from the spinerettes or spinerette plates 23 vertically downwardly and then reverse them at a steep upward angle to the two rows of inlet yarn delivery mechanisms 30 disposed on both sides of the middle frame 1 9 and associated with both rows of false twist sections 41.As in the machine 10 according to Figure 1, each of the two rows of false twist sections 31 again extends over the respective access walk 35 and the yarn take-up winders 1 7 for winding the yarns 29 are again disposed on the sides of the access walks 35 which are distal from the middle frame 19.

However, in this embodiment, only one row of side winders 1 7 is disposed adjacent to each of the access walks 35. The left-hand row of side winders 1 7 is disposed on an external frame 12' which defines the machine 10' on the left-hand side. The right-hand row of side winders 1 7 on the other hand is disposed on a vertical frame 40 each of whose two longitudinal sides is provided with one row of side winders 1 7. The yarns 29 which pass to the right-hand row of side winders are obtained from a second middle frame, not shown, with a melt spinning device, corresponding to the illustrated middle frame 19 including all the components and elements disposed thereon.The width of the machine 10' can thus be doubled, trebled, etc. by alternating frames 40 with take-up winders and frame 1 9 with melt spinning devices, and false twist sections 31 are disposed in each case between adjacent frames 1 9, 40 above the relevant access walk 35.

External frames, such as 12', having yarn takeup winders such as 1 6, 1 7 disposed on only one side thereof, will then be situated on the external longitudinal machine sides. Cooling zones 25, which commence on the exit side of the spinerette rows of spinerette plate rows 23 can extend as far as the inlet-side yarn delivery mechanisms 24'.

In the machine shown in Figure 2, the two rows of yarn passages, commencing on the middle frame 19, can advantageously extend approximately in mirror image configuration with respect to the longitudinal middle plane of the middle frame 19.

A relatively low overall height, simple construction and convenient means for accommodating the machine without converting the affected factory building is made possible since each of the machine 10 and 10' can be installed in one storey of the building, i.e. they are of single-deck construction.

Claims

1. A false twist draw texturising machine for endless yarns, comprising a plurality of false twist sections, each having a false twist element and each of which is provided for false twisting of one yarn, and a number of yarn wind-up stations corresponding to the number of false twist sections for winding up the false twisted yarns into packages, there being provided a melt spinning device for melt spinning the yarns which are to be drawn and false twisted on the machine, and cooling zones for air or gas cooling of the yarns disposed downstream of individual spinerettes or a spinerette plates for delivering the individual yarns to be false twisted, at least one zone for drawing the yarns being disposed downstream of each of the cooling zones.

2. A machine as claimed in claim 1, in which the melt spinning device is provided with a single tank for receiving the molten compound and extending in the longitudinal orientation of the machine substantailly over the working range thereof.

3. A machine as claimed in claim 2, in which spinning pumps for metering the molten compound and extruding it through the spinerettes or spinerette plates are disposed on the tank.

4. A machine as claimed in any one of the preceding claims, in which the cooling zones extend approximately vertically downwardly from the spinerettes or spinerette plates.

5. A machine as claimed in any one of the preceding claims, in which separate draw sections for drawing the yarns precede the false twist sections.

6. A machine as claimed in claim 5, in which yarn delivery mechanisms on the inlet side associated with the separate draw sections form exit side yarn delivery mechanisms of the cooling zones.

7. A machine as claimed in any one of the preceding claims, in which exit side yarn delivery mechanisms of the cooling zones are also provided for taking up the yarns from the relevant spinerettes or spinerette plates.

8. A machine as claimed in any one of claims 5 to 7, in which the separate draw sections are provided so as to extend vertically downwardly, vertically beneath the cooling zones.

9. A machine as claimed in any one of the preceding claims, in which the false twist sections are also provided for finish-drawing of the yarns.

10. A machine as claimed in any one of the preceding claims, in which the false twist sections extend substantially rectilinearly.

11. A machine as claimed in any one of the preceding claims, in which each individual false twist section is disposed above an access walk of the machine and extends transversely thereabove, the melt spinning device and the cooling zone preceding the false twist section being disposed on one side of the access walk and the yarn windup stations following the false twist section being disposed on the other side of the access walk.

12. A machine as claimed in any one of the preceding claims, in which the melt spinning device is disposed substantially at the level of inlet yarn delivery mechanisms associated with the false twist sections, the path of the spun yarns initially passing downwardly from the spinerettes or spinerette plates and being reversed by thread reversing elements in a steeply upward direction to the inlet yarn delivery mechanisms of the false twist sections.

13. A machine as claimed in claim 12, in which the yarn reversing elements comprise exit yarn delivery mechanisms associated with draw sections which draw the yarns.

14. A machine as claimed in any one of the preceding claims, in which there are provided on both sides of the vertical longitudinal middle plane of a middle frame a series of complete yarn passages, each of which commences at a row of spinerettes or spinerette plates of the melt spinning device disposed on the middle frame and terminates at thread take-up winding devices which are disposed on sides which are distal from the middle frame and are associated with access walks situated on both sides of the middle frame.

15. A machine as claimed in claim 14, comprising at least two middle frames between which there is disposed a frame with yarn take-up winding devices.

1 6. A machine as claimed in any one of the preceding claims, which is integrally constructed.

1 7. A false twist draw texturising machine substantially as hereinbefore described with reference to and as illustrated in Figure 1 or 2 of the accompanying drawings.