JPS62282058A - Method and apparatus for sizing spun fiber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Industrial Application Field The present invention relates to applying glue to threads that are continuously moved in the longitudinal direction of the threads either individually or as a group of threads. This invention relates to a method for applying glue to textile fibers. Furthermore, the invention relates to an apparatus for carrying out the above method. The term ``textile fiber material'' refers to flat shaped bodies of fibers, such as linear shaped bodies suitable for producing woven or knitted fabrics, in particular those consisting of fibre-based stable fibers or filaments, as well as metal fibres, glass fibers, etc. Consisting of or mixed with fibers or the like is to be understood.

In conventional technology, for example, the threads to be processed into a web are
It is treated with Nori leprosy to increase its strength for processing on a loom and to reduce friction as a warp thread. During nori-kake, the yarn is generally passed through the nori-kake bath as part of a group of yarns;
It is subsequently squeezed and guided through a wet treatment zone.

Furthermore, the glued thread is dried and wound onto a shaft.

The quality of conventional wet glueing therefore depends on whether the glue material is ultimately evenly distributed within and on the individual threads. In order that the glue can penetrate evenly and deeply into the filament bundle, the glue is first applied in large excess by dipping the thread in a glue bath and then partially squeezed out again with a squeeze device and averaged. be converted into Even if the glue bath is provided with a filling position and density adjustment device, the degree of glueing of individual threads is only relatively inaccurately reproduced. For safety reasons, therefore, in practice often a stronger welding is carried out than is originally necessary for weaving.

Another disadvantage of traditional nori boxwood by dipping is that the nori material is applied to the threads in a carrier liquid, such as water, or as a solution. In order to be able to wind the thread in its finished state onto a shaft for weaving, the liquid carrier or solvent must subsequently be removed in an expensive process, usually using thermal energy. .

Finally, the glue generally has to be removed again after the planar molding is completed. Of course, the cost of removing glue will be lower as the amount of glue applied to each thread is less.

DE 34 01 581 A1 discloses that in order to produce flock yarns, a running synthetic carrier yarn is first applied with a thermoplastic adhesive by dipping and then the electrically grounded yarn is connected to a high-voltage electrode of opposite polarity. At that time, the flock fibers conveyed by the conveyor belt are caused to fly toward the yarn by applying an electrostatic field oriented in the radial direction to the floc fibers, where they are fixed and held with an adhesive. A method has been proposed in which the flocked yarn is dried under longitudinal tension and then wound after thermal shrinkage treatment. Even if glue particles are used instead of flock fibers in this way, usable glue cannot be achieved because the previously applied adhesive layer will penetrate and thus result in a uniform glue of the yarn. This is because it interferes with the Moreover,
Sanding only the surface of the yarn generally does not produce the desired results of the glue boxwood treatment. Additionally, applying an adhesive layer is associated with essentially the same problems as applying glue in conventional wet glue boxwood.

Problems to be Solved by the Invention Accordingly, an object of the present invention is to measurably and reproducibly limit the amount of glue consumed or applied to each yarn to the extent essential for the weaving function, and to produce glued yarns. The goal was to reduce the energy required to pre-treat the material for weaving compared to the case of soaked nori.

Means for Solving the Problem The solution according to the invention to the above-mentioned problem comprises, in terms of the method, a method of the type mentioned at the outset for gluing threads or groups of threads, in which each thread is processed to be electrically conductive and It consists of being exposed to an electric field which is approximately radial to the longitudinal direction and by feeding the glue into the electric field from a sprayer which is at an opposite potential to that of the thread. According to an advantageous embodiment of the invention, the electric field is overlapped with a rotating magnetic field oriented to penetrate the thread approximately radially.

Function According to the present invention, a glue having no liquid component or only a very small amount of liquid component can be applied to individual threads by spraying.

This minimizes the consumption of glue, which can be precisely measured and reproducibly adjusted by adjusting the electric field, the glue atomizer and the yarn speed. Due to the minimal amount of glue applied and the extremely low moisture content, energy is saved during subsequent drying.

The minimum amount of glue applied also reduces the outlay in removing glue following the production of the planar shaped body, for example by weaving.

In the method according to the invention, the yarn to be treated is first rendered electrically conductive, preferably by applying a liquid. This step can be performed separately from or together with the predetermined glue application.

For example, a thread that is non-conductive by itself can be processed to have a certain level of conductivity by adding a conductive liquid to the glue that is sprayed during glueing.

According to the method of the invention, the individual threads are exposed to an electric field radial to the longitudinal direction of the thread. For example, the thread can be charged negatively and the cylindrical electrode surrounding the guide thread can be used as an anode to charge it positively. Advantageously, the cylindrical electrode or other device for generating an electrostatic field incorporates a device for spraying the paste.

This includes in particular thermal, mechanical and pneumatic atomizers. For example, piezoelectric vibrators are suitable as atomizers. The cylindrical electrode and the nebulizer may be on the same electrode.

In practice, smooth threads are glued, which can have fibrils or capillaries, such as filament yarns, but also threads with a surface covered with fine fuzz can advantageously be treated according to the invention. can. In the first case, according to the invention, mutual adhesion of the fibrils is achieved, so that fibril crosslinking during weaving is avoided. This stabilization is aided by the capillary action of the glue inside the fibers. In the other case, the individual fluffs of each yarn are oriented radially relative to the direction of the electric field, ie the longitudinal direction of the yarn. The sprayed nori is likewise accelerated in the direction of the radial electric field lines towards the fine fluffs which rise above all due to the high electric field at the tips of the fluffs. In this connection, according to a further embodiment of the invention, in addition to the electrostatic field, a rotating magnetic field oriented approximately radially to the individual threads or groups of threads is provided, or the electrostatic force is followed by a rotating magnetic field. It is advantageous to pass the thread through such a rotating magnetic field. By applying a rotating magnetic field to a charge that is moved together with the individual threads, it is possible to wrap the fluff glued at the tip around the individual threads and to evenly distribute the applied glue onto the threads.

When a rotating magnetic field is used, the fuzz, which is sometimes attached to an individual yarn, wraps around the yarn at a winding angle that depends on the frequency of the rotating magnetic field and the speed of conveyance of the yarn. Therefore, the winding angle can be reproducibly adjusted by setting the frequency of the rotating magnetic field and/or the yarn speed.

To generate a rotating magnetic field, a single magnetic pole in the form of a cylindrical electrode can be placed around the thread or group of threads. Of course, single magnetic poles should be magnetically insulated from each other, but they can also be used as poles of an electrostatic field (e.g. as cylindrical electrodes).
They can be at the same electrical potential so that they form.

According to another embodiment of the invention, it is also advantageous to arrange the means for generating a rotating magnetic field in the yarn transport device behind the atomizer. For this purpose, each yarn filament is first impinged with sprayed glue for filling the fibrils or capillaries in an electrostatic field and/or while the fluff is rising in the radial direction, and optionally only then in a rotating magnetic field. The fluff glued inside can be wrapped around the individual threads to which it belongs.

The results of glueing according to the invention depend on the parameters to be electrically controlled, namely the transport speed of the thread, the voltage difference between the thread and the electrodes, the strength and frequency of rotation of the rotating magnetic field and the type and operation of the glue sprayer. Ru. All these parameters can be determined using electrical control circuitry in a manner well known to those skilled in the art, to have a minimum amount of glue for use in a woven hat.
It can be controlled and held constant so that precisely measured and reproducibly glued threads are obtained.

Example The invention will now be described in detail with reference to the illustrated embodiments.

In the device of FIG. 1, a group of individual threads, generally designated 1, is passed through a cylindrical electrode 2 in a direction perpendicular to the drawing. A voltage U1 is applied between the thread group 1 and the cylindrical electrode 2. at least one glue sprayer 4 on the cylindrical electrode 2;
For example, a piezoelectric vibrator supplied with power from a high frequency source 3 is incorporated.

The glue particles 5, possibly starting from the atomizer 4, move towards the individual threads along the electric field lines extending radially between the cylindrical electrode 2 and the individual threads 6 of the thread group 1, called This is because the glue particles 5 coming from the atomizer 4 have an opposite charge to the yarn group 1, similar to the atomizer. In this way, each individual thread of the thread group 1 can be uniformly glued using the electrostatic field.

When a yarn in the form of a staple yarn with a fluffy surface 7 is electrostatically glued according to FIG.
It should be noted that due to the action of the electrostatic field, corresponding to the voltage U1 between the cylindrical electrode 2 and the individual thread 6, the fuzz 7 present on the thread is oriented approximately parallel to the electric field lines. Therefore, the individual fluffs of the fluff project substantially radially from the yarn 6, and the glue particles 5 starting from the atomizer 4 first collide with the tips of the raised fluffs 7 on their path along the lines of electric force. This is because there is a high peak electric field strength there.

According to FIG. 2, in addition to the electrostatic field of the cylindrical electrode 2, for example, a sixth
A rotating magnetic field as shown in the figure is provided. This rotating magnetic field is advantageous for electrostatically gluing threads whose surface has a fluff that runs parallel to the electric field lines within the electric field.

On the other hand, it is not necessary when gluing threads with a smooth surface. Rather, the electrostatically glued yarn with a smooth surface can be fed immediately after glueing to subsequent processing steps, such as drying, winding, etc.

In the following, electrostatic sizing of yarns, for example consisting of staple yarns, having a particularly fuzzy surface will be described.

FIG. 2 shows how the cylindrical electrodes can be electrically and magnetically connected and equipped with a device for spraying glue.

A cylindrical electrode 2 is connected to the cylindrical electrode 2 at a speed V by an effective pair of rolls 8 using a thread group 1 processed to have specified conductivity by some means as an electrical contact.
and, after passing, are transported further to the subsequent processing step via a second pair of rolls 9, which also serve as electrical contacts. There is a voltage U I between the first roll pair 8 and the cylindrical electrode 2.
+U 2'tl- is applied, while only voltage U1 is applied between the second roll pair 9 and the cylindrical electrode 2. Therefore,
At the entrance E of the thread group to the cylindrical electrode 2, there is an exit A for the thread group 1.
An even higher electric field strength acts at , ie the electric field between the inlet E and the outlet A of the cylindrical electrode 2 has a decreasing gradient from E towards A. In such a structure, it is preferable that the nori sprayer 4 is placed within the range of a relatively large electric field.

Following the atomizer 4 in the direction of the conveying speed of the yarn group 1, a rotating magnetic field device, generally designated 10, can be provided, which is configured to generate an alternating electric field 11, as in a three-phase electric motor, for example.
It is possible to have a magnetic pole 12 that generates . One embodiment of such a rotating magnetic field device is shown in FIG. 3 as a sectional view perpendicular to the longitudinal direction of the thread group 1. Six phases R, S of a frequency-controlled three-phase current power supply.

Six magnetic pole pairs 12 connected to T are provided.

The group of yarns moved according to FIG. 1, having vertically erected fluffs 7, are first impinged by the sprayed glue in the device according to FIG. When wrapped, the individual fluffs 7 of the fluff are wound around each individual yarn 6 of the yarn group 1 so that a smooth yarn with high strength results.

As is clear from the principle diagram in FIG. 4, the winding angle W that the fluff 13 forms with the longitudinal axis 14 of the yarn when seen in the projection view is determined not only by the magnetic field B itself but also by the frequency of the rotating magnetic field and the winding angle W of the yarn 6. It depends on the conveyance speed V. If the frequency f is doubled and the speed V is constant, or if the frequency is constant and the speed y f) 1%, the wrap angle W is enlarged by the same amount.

[Brief explanation of the drawing]

Figure 1 is a sectional view transverse to the longitudinal direction of the yarn of a device for electrostatically binding yarns together, and Figure 2 is a cross-sectional view of a device for electrostatically binding yarns in a rotating magnetic field in order to wind fluff around individual yarns. FIG. 3 is a longitudinal cross-sectional view of the apparatus for applying glue to the threads; FIG. FIG. 3 is a diagram showing the dependence of the winding angle on the yarn speed. 1... Thread group, 2... Cylindrical electrode, 3... High voltage source,
4... Sprayer, 5... Nori particles, 6... Thread, 7...
... Fluff, 8... First roll pair, 9... Second roll pair, 10... Rotating magnetic field direction, 11... AC power supply, 12... Magnetic pole, 13... Fluff , 14...Longitudinal axis of thread, Ul...Voltage, U2...Voltage, ■...
・Yarn conveyance speed, E...Entrance, A...Exit, W...
- Winding angle, f...Rotating magnetic field frequency 6... Thread

Claims (1)

[Claims] 1. A method for applying glue to textile fibers by applying glue to threads (6) that are continuously moved in the longitudinal direction of the threads either individually or collectively as a group of threads (6). , processing the thread (6) to be electrically conductive and exposing it to an electric field that is approximately radial to the longitudinal direction of the thread, and supplying glue into said electric field from a sprayer (4) at an opposite potential to that of the thread; A method for applying glue to textile fibers. 2. During the gluing of the yarn (6) with the fluff (7), the fluff (7) is separated from each individual by a magnetic field oriented approximately radially through the yarn (6) being moved. The method according to claim 1, wherein the method is wound around a thread. 3. The method according to claim 2, wherein the winding angle (w) of the fluff (7) to be wound is defined by controlling the frequency of the rotating magnetic field and/or the conveyance speed of the yarn (6). 4. Individual thread filaments are first glued in an electric field,
4. The method according to claim 1, wherein the glued fluff is then wound around a thread (6) which is moved in a rotating magnetic field. 5. Claim 1, in which the thread (6) is processed to have a certain level of conductivity by blending a conductive liquid when it is glued.
The method described in any one of paragraphs to paragraphs 4 to 4. 6. When applying glue to the threads (6) that are continuously moved in the longitudinal direction either individually or as a group of threads (6), the threads (6) are processed to be conductive and the threads are In a device for gluing textile fibers by exposing them to an electric field which is approximately radial to the longitudinal direction and by feeding the glue into the electric field from a sprayer (4) which is at an opposite potential to that of the yarn, one side of the electric field a cylindrical electrode (2) through which a thread forming a pole and forming the other pole of electrolysis is guided;
A device for applying glue to textile fibers, characterized in that it has a glue sprayer (3) having a potential of ). 7. Device according to claim 6, characterized in that a positively charged cylindrical electrode (2) is provided as an anode with respect to the thread (6). 8. Device (10) that generates a rotating magnetic field around the thread (6)
) is arranged. 9. The device (10) that generates a rotating magnetic field has a single magnetic pole (12
) forming a cylindrical electrode (2) whose magnetic poles are at the same potential and are assigned to the thread (6).
Apparatus described in section. 10. According to any one of claims 6 to 9, wherein the device (10) for generating a rotating magnetic field is arranged behind the atomizer (4) in the direction of conveyance of the yarn (6). equipment.