DE2246357A1 - METHOD AND EQUIPMENT FOR MANUFACTURING ELASTOMER FAEDS - Google Patents

Description

DR.-ING. G. RIcBLINIa ^ My sign

31362-14 / lo / Wm

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889 Undau (Bodensee) Your · Message from Renncrf · 10 · Postfach 3IiO

September 19, 1Ö72

Jahn Heathcoat & Company, Limited,

a British Company of Tiverton, Devon / England

t / experienced and device for the production of elastomeric «Mdeh

The subject of the invention is a process titiä Öe'räfc for the production of elastomeric threads, esp. Faöeri äüs Polyurethane. . . ., - -

There is a significant price difference between the Cost per unit weight of elastomeric threads' Von Hohem Denier and threads of the same material of low

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Denier degree. For example, does a given court of polyurethane thread with 4o denier degrees to Ze ¹ It is about twice as much as the same weight of threads geillti same material with I4o denier degrees * It is Öiöe object of the present invention * elästomereh threads low BEHIER degree Freeze from the relatively cheap high denier thread of the same material while maintaining acceptable physical properties in the produced low denier thread.

M is already known * to reduce the benier-Gfad vöü eiäs'fcöitie'reh threads' by stretching them and then to subject them to heat treatment ¹ "" foe-äteiifeiM ätiä liiefit deÜ iirheat and then to cool down ¹ §e threads _t WSÜirelä äi§e ^; §trec'kt v ^ fbleiben; Öäs bäkäritite V ^ iit fiaiir'ifi ühd erfördert the Anweridun ^ a Üiedritfeii f Olle a Laërt ^ e ^ Heiäz it * which 'sb much TFII üieilrefe §tMn'äe'fi can.

Tölyurethänfäden Gespöhiiene ¹ erfördern therrttische post-treatment in order to stäbllläiifefl: E # has been proposed to do this as a * köfltiiiiiifiigiiif process, by running defseifeeii üb§f ifllitiäte rollers or series of heated Wallen; The thifmiiehe

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Post-treatment is carried out simultaneously with a moderate degree of stretching, followed by relaxation, either in the last part of the heat treatment time or immediately after the heat treatment.

This treatment does not and is not intended to produce any appreciable change in the denier of the threads.

In fact, the denier often increases during the process. The procedure is just to stabilize of the thread material and to increase its elasticity.

All the known procedures, pay attention to the use of Temperature-η below the known breakdown temperature of polyurethane in order to avoid damage to the material.

These known methods are outwardly similar to the method of the present invention, but that The method of the present invention represents a significant advance in the manufacture of threads using low denier of elastomeric high denier filaments as a continuous process at a Makes possible throughput far in excess of that available by known methods while in the filaments with low denier a high elongation is maintained. '

According to the invention, there is a method of production

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from lower denier elastomeric filaments from higher denier elastomeric filaments from cold stretching as a continuous process of successive pieces of higher denier thread to an extent sufficient to increase the denier of the pieces lower the desired and then immediately heating the parts in succession as a continuous process to a temperature above the known degradation temperature of the particular thread material and for a length of time less than that within which the material will degrade at that temperature to a considerable extent, but long enough to ease the stress in the stretched thread.

An example of the temperature to which the thread material is heated is 22o C and an example of a suitable time at that temperature is about 5 seconds.

The apparatus for carrying out the method includes an unheated thread gripping and feeding device arranged to feed the thread from a package , a heated thread gripping and feeding device arranged to feed the thread from the unheated one To obtain thread gripping and feeding device , and to heat the thread and bring it forward , a drive arrangement for driving the the

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Thread gripping and feeding devices so that the heated gripping and feeding device is operative is to move the thread at a linear speed to move forward, which is higher than the feed speed of the unheated gripping and feeding device, and an arrangement for taking up the thread when it is the heated gripping and feeding device leaves.

An unheated one in between, “gripping the thread and feeding device is between the first mentioned unheated, the thread gripping and feeding device and the heated, the thread gripping and feeding device Apparatus is provided with the intervening gripping and feeding apparatus driving on a drive assembly is coupled to be operable to feed the thread at a linear speed that is lower than the feed rate of the heated gripping and feeding device.

The gripping and feeding devices contain rollers or belts or ferrules. For high-speed handling of the individual threads the heated yarn and cross-feeding apparatus includes a heated roller. is formed with a number of parallel blocked grooves and a rotatable guide rod parallel to the axis of the roller, the thread being arranged around

run each groove in the roller over the rotating guide rod and into the next groove, etc., until it reaches the desired one Number of grooves crossed, and the rotating guide rod serves to pull the thread out of a groove to lift into the next.

The intermediate gripping and feeding device is constructed as pinch rollers or as a roller that is formed with parallel grooves and associated guide rod, as described above.

The term "heated, thread gripping and feeding Device "is used in this specification to mean that the device in question is capable of is to be heated. ,

The heated gripping and feeding device is provided with an arrangement for introducing and discharging a hot gas such as steam therefrom . The heated gripping and delivering device may also include an electrical heating element.

Where several threads undergo the procedure at the same time are, it would be impractical to guide the multiple threads simultaneously through a series of grooves. In a

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Construction for working on several threads at the same time two pairs of pinch rollers are provided, which are tight on the surface of the heated one gripping the thread and feeding device-forming heated roller mounted, at locations on opposite sides of one Arc of the roll surface, opposite an angle less than 36o ° on the roll axis, with an arrangement is intended to drive all of the pinch rollers and the heated roller at the same peripheral speed which is arranged to be higher than the peripheral speed of the unheated gripping and feeding device, each thread through the first pair of pinch rollers is non-tangential is brought to the heated roller, around the sheet of the The roller surface moves through the two sets of Pinch rollers is defined, and is heated by the roller, and then not moved tangentially away from the roller by the action of the second pair of pinch rollers. In this construction, the heated roller can be grooved or flat.

An intermediate pair of unheated pinch rollers is between the unheated thread gripping and feeding device and the first pair of pinch rollers provided, the intermediate pinch rollers so are arranged to be at a peripheral speed between

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that of the unheated, the thread gripping and feeding device and that of the pinch rollers to be driven.

On the pinch rollers can be dispensed with, where the frictional torque between the threads and the heated The roller is large enough to provide the necessary tension on the threads, but usually the Pinch rollers may be necessary in this design. It may be explained here that the desired length of Heating time with this construction because of the low Yarn speeds is reached that are used in warp knitting machines, the feed speed then is low. The high throughput of the invention is achieved due to the simultaneous passage of several threads through the device.

A device that is arranged to handle multiple threads at the same time to process includes an arrangement operable to remove the filaments from the hot part of at least the remove heated grasping and feeding device upon occurrence of a break in one of the treated ones Threads or in the event of an unintentional stopping of one of the devices gripping and feeding the thread.

Practical forms of implementation of the device

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Procedure are in the accompanying schematic drawings illustrated.

It shows:

Pig. 1 a device that is able to produce an elastomer Making thread at high speed, and

Fig. 2 shows a device for carrying out the method at the same time on a number of threads, but at a slower speed.

The device of Fig. 2 is esp. For use with a warp knitting machine useful, which has a number of threads required, which are fed to her at the same time at a comparatively low speed will.

In the drawings and in particular in FIG. 1, 1 denotes an unheated one which grips and feeds the thread Device that. is arranged to take the thread from one To feed yarn package, 2 denotes a heated, the thread gripping and feeding device, consisting from a roller 3 formed with a large number of parallel, non-connected, circumferential grooves is, and a rotatable guide rod 4, which is parallel

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is arranged to the axis of the roller 3, wherein the roller 3 can be heated, and 5 denotes an arrangement for receiving the thread from the heated, thread gripping and feeding device 3. 6 denotes an unheated device that grips and feeds the thread and consists of a roller 7 provided with a number of parallel, non-connected circumferential grooves and one rotatable guide rod 8 parallel to the axis of the Roller 7. 9 denotes a drive arrangement which is operative, those gripping and feeding the thread Devices 1, 2 and 6 with their selected peripheral speeds to drive. Io Aun d Io B denote unheated parts of a thread on its way from the unheated, the thread gripping and feeding device

1 to the heated, the thread gripping and feeding device 2, 11 denotes a thread part, which by the heated, thread-gripping, feeding device

2 is heat-treated, and 12 denotes a thread part that is heat-treated and relieved of tension on its way to the receiving arrangement 5 of the thread. As can be seen from Fig. 2, 13 denotes an unheated, the thread gripping and feeding device arranged. To feed threads of yarn packages, 14 denotes a heated, thread gripping and feeding device,

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formed by a roller which can have a flat or grooved surface, 15 denotes a take-up arrangement for taking up threads, when they come from the heated device 14. The receiving arrangement 15 can be a warp beam or the Inlet to a warp knitting machine or other textile machine that uses a multi-thread feed. 16 and 17 denote a pair of pinch rollers which serve to cause the treated threads to coincide with the surface of the device 14 to remain in contact over a selected arc angle of the device 14.

18 denotes a pair of pinch rollers therebetween.

19 denotes a detector device which, when a certain thread breaks or when one of the stops Thread gripping and feeding devices is put into operation to feed the broken thread or to stop all threads. 2o A and 2o B denote unheated parts of threads on their way from the unheated the thread gripping and feeding device 13, to the heated thread gripping and feeding device Device 14, and 21 denotes parts of the thread which are passed through the heated, thread gripping and feeding device 14 is heat-treated, and 22 denotes thread parts of heat-treated and tension-relieved threads on their Path to the thread take-up arrangement 15.

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In practice and referring to Fig. 1 first suitable peripheral speeds for the various parts of the illustrated device 80 m per minute for device 1, 135 m per minute for device 6, 228 m per minute for device 2 and 266 m per Minute for the device 5. A suitable temperature for the device 2 is 22o ° C, which is above the degradation temperature of polyurethane, and at this The speed of the thread part 21 moves around the drum 3, which has a diameter of about 2oO ram, provides a contact time with the drum of about 5 seconds, which is less than the time at Polyurethane is required to substantially degrade at 22o ° C. In operation, the thread parts Io A and Io B stretched when cold, because of the different peripheral speeds of devices 1, 6 and 2, to an extent sufficient, the denier level from the original level to the desired denier level as a continuous process as the thread advances continuously. The stretched one Thread is then heated as it passes through the heated device 2, for a sufficient length of time, and to a temperature sufficient to relieve the tension that previously deeed in the cold thread as a result Stretching process existed. The tension-relieved 'thread

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is then received by the receiving arrangement 5. The somewhat higher peripheral speed of the device 5 compared to that of the device 2 only serves to to keep the thread taut and to continue the feed movement. The purpose of the intervening intervening and feeding device 6 is to divide the stretching process into two parts, the greater amount of the Stretching operation is carried out on the part Io B, which is separated from the package, thus reducing the risk of Significantly reduce yarn package distortion. The speeds mentioned are only typical peripheral speeds. With some threads, these speeds can be exceeded considerably.

Referring to Fig. 2, the peripheral speeds of the devices 13, 16, 14 and 17 may suitably be that Have ratio, 1: 3.5: 3.5: 3.5. This construction is suitable for situations where it is necessary is to feed forward a number of threads simultaneously as required in warp knitting; because several threads are fed side by side, it is usually not feasible due to lack of space, the thread to run around the heating roller a few times. A warp knitting machine, however, requires, that you fed threads comparatively slowly fed, should be. A sufficient heating time can then be achieved

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are made by running the threads over only part of the surface of the same roller at the same time, the Peripheral speed of the roller and the length of the arcuate part of the surface of the roller with which the

Threads are in contact, so arranged that each Filament is heated for a time sufficient to provide the necessary stress relief. The stretching process is carried out on the parts 2o of the threads between the device 13 and the pinch roller 16, the parts 21 of the threads are fed via the roller 14. Without another stretching operation being carried out because the Pinch rollers 16 and 17 have the same peripheral speeds. The additional pair of pinch rollers 18 serves the same purpose as the device 6 of Fig. 1, i.e. the most of the stretching is done on the 2o B portions of the threads so that there is minimal tension on the Consists of yarn packages from which the threads are drawn, in order to minimize the distortion of the yarn packages restrict. The detector device 19 is effective to stop the device when one of the feeding devices comes out of service, or to stop feeding a particular thread when that thread breaks. The detector device can of course be arranged to stop the entire device if any particular thread breaks.

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The intermediate feed devices 6 and 18 can of course be omitted if it is not considered necessary to limit the tension on the filamentary yarn packages , but such intermediate devices are normally incorporated in the apparatus.

The cost of running the process is low, in part because of the high throughput. Individual threads can can be manufactured at linear speeds of hundreds of meters per minute, versus approximately 2 m per minute with the known method. This allows the overwhelming saving of the large difference in costs between threads with a low degree of denier and those of high denier. The method of the invention thus sees a significant advance in cost in the manufacture of low denier filaments.

Claims

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Claims (1)

- it ■ · ■ Claims Ij. Process for the production of elastomeric threads with low denier, made of elastomeric threads of high denier, characterized by stretching successive parts of a high denier thread when cold as a continuous process, to an extent sufficient to bring the denier of the parts to the desired one and then immediately heating those parts in sequence as one continuous process a temperature above the known degradation temperature of the particular thread material and for a shorter length of time than that within which the material will degrade to a significant extent at that temperature, but long enough to keep the tension in the drawn thread to relieve. 2. The method according to claim 1, characterized in that the temperature is not less than 22o ⁰ C and the length of the heating time is not more than 5 seconds. - 17 - 309816/1032 3. Apparatus for carrying out the method according to claim 1, characterized in that an unheated, the ßden gripping and feeding device (1) is arranged to be at a To work at least one thread continuously at a speed of one speed To feed thread feed a heated, the thread gripping and feeding device (2), which is arranged is to work at a higher speed to pick up and heat the filament and turn it continue to be fed continuously at a higher speed to an arrangement (5) for receiving the thread. 4. Apparatus according to claim 3, characterized that an intermediate unheated, the thread gripping and feeding device (6) between the unheated, the thread gripping and feeding device (1) and the heated, the thread gripping and feeding device (2) is provided, the gripping and feeding device arranged therebetween Device (6) is arranged to operate at a speed between the operating speeds of the unheated, the thread gripping and feeding device and the operating speed of the heated thread gripping device and feeding device to work. - 18 309 8 1 6/1032 U-: '^ 5. Apparatus according to claim 3, characterized in that the unheated, the Thread gripping and feeding device is arranged to feed several threads at the same time, the heated thread gripping and feeding device is a heated roller, and two pairs of pinch rollers close by the surface of the heated roller in places; opposite Sides of an arc are attached to the roller surface at an angle of less than 36o on the roll axis, an arrangement is provided for driving all of the Pinch rolls and the heated roll at the same speed of rotation, which is located, higher to be than the peripheral speed of the unheated gripping and feeding device, the arrangement is such that each thread. through the first · ΡίΜ1τΓνοϊ1. · ■■■ · ■ /: - Pinch rollers not tan-entially brought to the heated roller runs around the arc of the roll surface defined by the two sets of pinch rolls and through the roller is heated, and then by the movement of the second pair of pinch rollers is not guided away tangentially from the roller. 6. Apparatus according to claim 5, characterized in that - - 19 - 309816/1032 - if - indicates that an intermediate Pair of unheated pinch rollers between the unheated the thread gripping and feeding device and the first pair of pinch rollers is provided> the intermediate pinch rollers are arranged to at a peripheral speed between that of the unheated, the thread gripping and feeding device and that of the pinch rollers to be driven. 7. Apparatus according to claim 5, characterized. marked / that an operational
Arrangement is provided to remove the threads from the hot part of at least the heated, the thread gripping and feeding device in the event of a break in one of the treated threads or if one of the thread gripping and feeding devices is inadvertently stopped. 309816/1032 10 . Blank page