KR900005995B1 - Production method of weaving warps of monofilament thermoplastic synthetic yarn - Google Patents

Abstract

A process for producing a weaving warp of a thermoplastic synthetic monofilament yarn comprises winding directly onto a warp beam, newly spun polyester, polyamide or polypropylene yarns without ay intermediate winding into spools or packages. The beam is exchangeable when the changing cycle involves the use of nipping, cutting and taping mechanisms preceded by yarn accumulator appts.

Description

Method for manufacturing regular slope of thermoplastic synthetic monofilament yarn

1 shows a schematic representation of the lower part of a radiation conduit in a device according to the invention.

2 is a schematic view showing the top of the radiation conduit in the device according to the invention.

The present invention relates to a method for producing a regular inclined yarn using a thermoplastic monofilament yarn such as polyester, polyamide, polypropylene, and the like, and an apparatus related thereto.

As used herein, the term "normal inclination" is synonymous with "partial inclination", i.e., the inclination including the fractional number of the yarns relative to the total number of yarns located on the loom, the inclination being a plurality of partial inclinations. Can be rewound on a single beam by a method known as assembly winding to obtain a canon that is suitable for use directly on the loom. The present invention is directed to warp yarns but is not intended to limit the use of such warp yarns for any particular textile product.

In a conventional system for making thermoplastic synthetic monofilament yarns to warp yarns, the spinner includes one or more single nozzle spinneret (s). After the cooling and oiling process, the monofilaments of the nozzles are respectively wound in a take-up device, and each monofilament is wound on the corresponding spool or package.

Spinning heads may contain a limited number of spinnerets, and subsequent filament coolers and winding devices may be installed in a single single spinning head having the limited number of yarns described above. In other cases, ie using spinnerets provided with multiple nozzles, all yarns released from such spinnerets are cooled and oiled to parallel-wind to a single spool. In these spools in which multiple companies are winding up, the yarns are dismissed by the rolling take-off method, and then re-recommended in each company is rolled up in its own single spool. Canons are obtained by canoning a number of yarns from different spools (or packages) located on krill.

If the yarn obtained by the melt spinning method is not sufficiently stretched, it is necessary to perform the stretching step on a suitable machine before the diameter. Typically such stretching devices operate on each unstretched spool to produce the corresponding single end processing.

It is an object of the present invention to provide a system for producing a regular slope, wherein the radiator can produce the exact slope by simultaneously producing the exact number of yarns required.

The method of the present invention is suitable for producing regular warp yarns from thermoplastic monofilament yarns such as polyesters, polyamides, polypropylene and the like.

The apparatus according to the method of the present invention shown in the drawings is constituted as follows; An extruder and a molten spinning head 1 consisting of a spinneret with at least one pump 2, a spin pack and spinneret retaining block 3, and a spinneret as many nozzles as necessary to meter the molten polymer; A cooling device of an extruded filament composed of an air blowing chamber (4); -Radiation conduit 5; -Spinneret or oiling device 6 and slope 7; A yarn suction device (8) and a yarn separation induction machine (9) acting upon trimming; A sound roll (godet) 10, 11, which can be used to stretch or stretch yarns, and any stretching apparatus; A yarn sheet nipping device (13), a cutting device (15) and a taping device (15) used to replace a fully-wound canon beam during a continuous spinning process; -Four separate induction apparatus (body) 16; Canon beam winding device (17).

According to a preferred embodiment of the present invention, there is provided a yarn accumulator and retrieval device 12, which are necessary when accumulating the sheet during beam replacement without stopping the spinning process, so as not to reduce the spinning speed during beam replacement. Can be.

More representative portions and functions of the device of the present invention will be described in more detail.

The melt spinning head may be a single spinneret having the same number of nozzles as the number of yarns constituting the inclined slope, or may be provided in a number of spinnerets with a total number of nozzles equal to the number of yarns constituting the inclined slope.

Using multiple spinnerets, higher temperatures can be uniformly obtained by contacting the surface with the thermally conductive medium in the increased spinneret. The number of yarns required for the canonical slope is usually at least 500.

With the cantilever production system according to the invention, the apparatus of the invention is substantially reduced in size compared to conventional systems, and does not have to go through a single spool (package) step, and the yarn obtained by spinning produces a cantilever. Can be used directly.

Thus, the warp production method is a complete continuous process. The method of the present invention comprises two separate stages, as in conventional systems, two separate stages starting from such a spool pre-positioned on the feed krill, followed by a separate spinning stage that winds the yarn onto the spool. It is not separated into steps. By means of the method according to the invention, a cantilever is advantageously produced using a single spinning head and a single focusing device over a conventional system which requires multiple spinning heads for each cantilever, and the canning process is completely separate from the melt spinning step. This is advantageously done in a subsequent step.

The essential elements and related devices in the method according to the preferred aspect of the present invention consist of a device for concentrating and recovering the site occurring in the continuous spinning step, thereby reducing the spinning speed without interrupting the spinning process and only reducing the spinning speed. Can be replaced.

The device may consist of two sets of rolls located horizontally with each other, with axes in a direction perpendicular to the travel direction of the sheet, wherein the first roll 19 located below is fixedly positioned while the second roll 20 may be staggered with respect to a 1st roll, and may move vertically downward. In normal working conditions, the sheet moves between two sets of rolls without contacting the rolls. However, in the focusing step, the upper roll is lowered below the lower roll so that the sheet must move along the looped passage. The amount of yarn that can be accumulated in this way will be proportional to the number of rolls and the maximum possible distance between the fixed and moving rolls. The accumulators work simultaneously with the pawl adjusting nipping device, cutting device and taping device when the beam is replaced.

In the method according to the invention it is possible to use both known yarn accumulators and warp beam replacement devices.

The spinning method can be carried out consistently with the sheet stretching apparatus, preferably using two sets of rolls with one main roll and two press rolls of larger diameter per tank, Is faster than the peripheral speed of Article 1, so that the ratio of the two peripheral speeds is the same as the intended extension rate. Immediately after stretching and prior to accumulation, it may be convenient to equip the usual apparatus for thermal relaxation and heat setting of the warp depending on the final purpose of the warp.

By the industrial method, which is the object of the present invention, it is possible to obtain a warp yarn composed of yarns having different characteristics depending on the use of the stretching apparatus described above and / or depending on the final winding speed.

By using the stretching apparatus, a fully drawn yarn can be produced. In the absence of a drawing device, the final winding speed determines the manufacturer's spraying orientation (and properties), and as the winding speed increases, the molecular orientation increases.

Depending on the nature of the thermoplastic resin used, winding at high speed yields almost complete stretched yarn, which is suitable for direct use for weaving. Winding at an intermediate speed yields yarns that are not fully wound, and such warp yarns are preferred using wet warp stretching methods as described in Italian Patent Application Nos. 19907/82, 23476/83 and 24050/83. Can be extended. The characteristic of the novel method of manufacturing the warp in the present invention is that the focusing beam is fixed to both sides of the winding machine so that it can be wound at an extremely high winding speed, that is, a speed of 6000 m / min or more without any mechanical problem.

This results in less wear and more reliable winding than in conventional spool winding systems.

Various known systems consisting of rubber clamping jaws, devices for supplying and applying upper and lower layers of adhesive tape, and sheet cutting devices, for nipping, cutting and taping of warp beams during beam replacement. Can be used.

Example 1

A semi-dull polyester resin obtained by polycondensing terephthalic acid and ethylene glycol is used.

A regular warp yarn composed of 580 monofilament yarns with a circular cross section was manufactured and focused on a small sock beam having a 22 inch distance between flanges.

Spinning is performed at a polymer temperature of 297 ° C. through a 620 mm × 55 mm rectangular spinneret with 154 nozzles staggered in four rows. The oil ring device is calibrated so that the yarn contains 0.4% oil. No stretching device is used, and the final focusing speed is maintained at 1560 m / min. A warp consisting of yarns having 71 deniers is obtained.

This slope is then wet drawn and heat set according to the method described in the patent application described above. The final number of yarns is 20 denier and the residual elongation is 34%.

Example 2

The thermoplastic resin and spinneret of Example 1 were used, spinning was carried out at 299 ° C, and the spinning mill was adjusted so that the processing rate of yarn was 0.55%. The stretching device is not used, and the final winding speed is maintained at 6100 m / min.

Eight small sock beams with 580 strands of yarn each are obtained. The number of final yarns is 20 denier and the residual elongation is 63%. A knitted fabric having monofilament yarn as a substrate is obtained by a Reschel knitting machine equipped with a small beam having 12 strands of 40 denier polyester filament yarns together with the above-mentioned small beams of semi-less polyester monofilament yarns. .

When stained with a dye of sufficient sensitivity to exhibit possible disproportionants, the substrate of the monofilament exhibits uniform dye adsorption.

Claims (5)

Slant sheet yarns are produced directly and continuously using a single spinning device without winding the yarns in the middle spool or package, where the replacement of the beam consists of nipping, cutting and taping steps, and only spinning speed without stopping the spinning process. A thermoplastic synthetic monofilament made from polyester, polyamide or polypropylene, characterized by the use of an inclined sheet accumulator and recovery device located between the bottom of the melt spinning device and the top of the nipping device to reduce and replace the beam. A method of continuously producing a nonclinical wound cantilever or partial cantilever composed of yarns. 2. The inclined sheet accumulating and retrieving device according to claim 1, wherein the inclined sheet accumulating and retrieving device is composed of two sets of rolls arranged in parallel with each other, having an axis perpendicular to the direction of movement of the inclined sheet, wherein the first roll located in the lower portion thereof is fixed The second roll can be moved vertically downward so that it is staggered with respect to the first roll in the normal operating state and positioned at the bottom of the first roll during the accumulation step, and the sheet is not in contact with the roll under normal conditions. Moving between rolls. 2. A method according to claim 1, characterized in that the warp accumulator and warp nipper, cutting and taping device start simultaneously during beam replacement fixation. The method of claim 1, further comprising using an apparatus for stretching the warp by a dual system consisting of a pair of rolls rotating at different speeds. 5. A method according to claim 4, further comprising a device for thermally relaxing and heat setting the warp sheet after stretching and before winding in non-clinical conditions.

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