JPH0122379B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for applying a sizing agent to yarn at a low rate, and more specifically to a sizing agent made of a thermoplastic polymer capable of forming a water-soluble film. The present invention relates to a device for applying a sizing agent (hereinafter abbreviated as sizing agent) to yarn at a low rate.

BACKGROUND ART Conventionally, in the process of sizing yarns, water-soluble sizing agents such as starch, carboxymethyl cellulose, polyvinyl alcohol, or water-soluble acrylic resin have been used. Such water-soluble sizing agents need to be heated and dried to completely solidify them before being supplied to the thread take-up beam for the weaving process. Therefore, in the conventional weaving preparation process, , the provision of a heating drying process or a heating drying device was considered to be an essential requirement. Naturally, the use of such a heating drying process or heating drying device has a negative impact on promoting energy saving effects and saving floor space.

In order to avoid the above-mentioned problems associated with the use of water-soluble thickening agents, recently, thermoplastic polymers capable of forming a water-soluble film, such as paraffin wax, are used as the main component, and an appropriate amount of methyl acrylate has been added to this. ,
Meltable glues made from thermoplastic polymers of stearyl methacrylate, stearic acid, methacrylic acid, styrene, and the like are being used.

Problems to be Solved by the Invention By using a sizing agent made of a thermoplastic polymer capable of forming a water-soluble film as described above,
Various inconveniences caused by the use of water-soluble sizing agents can be solved, but as a device for supplying sizing agent to yarn, an open-type sizing tank as described in Japanese Patent Publication No. 10942/1983 can be used. When using a heating roller, the contact state of the threads, such as the warp threads, with the sizing agent supporting surface of the heating roller becomes unstable, resulting in variations in the amount of sizing agent adhered to the sizing agent, and the sizing agent is oxidized by heating. A problem occurs.

To explain in more detail, when using an open size tank, it is necessary to rotate the heating roller at a low speed in order to reduce the amount of size agent applied to the yarn to the minimum necessary limit, but such operating conditions were adopted. This makes it difficult to spread the sizing agent into a thin film, and a problem arises in that the sizing agent in the form of droplets adheres unevenly to the threads. Further, since the adhesive is stirred by the heating roller whose peripheral surface is partially immersed in the hot-melt adhesive, deterioration of the adhesive due to oxidation is accelerated.

On the other hand, as a means to avoid the above-mentioned problems caused by the use of open-type glue tanks, the use of sealed glue supply nozzles is being considered, but in this case, the objects to be processed are limited to fabrics or films. was. That is, when trying to use a sealed size supply nozzle as a yarn processing device, there is a gap between the yarns, so
On the coating roll 7, the sizing agent is divided into a part that is carried away by the threads 9 and a part that remains on the surface of the coating roll 7. As a result, the wettability of the sizing agent on the applicator roll 6 also changes, causing variations in the thickness of the sizing agent film on the surface of the sizing agent roll, and the amount of sizing agent supplied to the roll and the yarn There is likely to be an imbalance between the amount given to
In many cases, the spreading of the adhesive into a thin film was inhibited.

The main object of the present invention is to provide an apparatus for applying a sizing agent to yarn at a low rate, which can overcome the above-mentioned drawbacks of conventional means.

Means for Solving the Problems In view of the above object, the present invention provides a tank having a built-in heating device for melting a sizing agent made of a thermoplastic polymer capable of forming a water-soluble film, and a metered-quantity delivery method. a sizing agent supply device 3 consisting of a pump 2;
A pipe 4 with a heat insulating jacket is attached to the glue supply device.
a sealed glue supply nozzle 5 connected via;
Applicator rolls 6 are disposed facing each other in sliding contact along the nozzle upper edge 5a of the glue supply nozzle.
and slides into contact with the applicator roll with the generatrix direction aligned, and slides into coating roll 7 with a built-in heating device that rotates at a higher temperature than the applicator roll 6, and the adhesive supporting surfaces of the applicator roll 6 and coating roll 7. A sizing agent recovery tank 12 equipped with a heating blade 11, a pipe 13 surrounded by a heat insulating jacket 13a connecting the sizing agent recovery tank and the tank 1, and a recovery pump 14.
The gist of this invention is a device for applying a sizing agent to yarn at a low rate, which is constituted by a sizing agent recovery device consisting of a sizing agent recovery device.

Function The sizing agent is sealed in the sealed sizing agent supply nozzle 5 and the sizing agent supply device 3 in a state where it is isolated from air until just before being sent to the yarn 9, so that it is not oxidized by heating in the atmosphere. is effectively prevented. When the operation is stopped, the back-up roll 8 is separated from the coating roll 7, and the application of the size agent to the yarn 9 is interrupted. On the other hand, the sizing agent supported on the circumferential surfaces of the applicator roll 6 and the coating roll 7 is transferred to the heating blade 11 except for the amount supplied to the yarn 9.
and is collected into the tank 1 of the glue supply device 3 via the pipe 13 and the collection pump 14. Therefore, deterioration of the adhesive due to heating in the atmosphere is reliably prevented.

Embodiment FIG. 1 is a side view illustrating the apparatus of the present invention.
The term "glue" in the present invention is a general term for glue, wax, hot melt, or oil made of a thermoplastic polymer capable of forming a water-soluble film. Further, the term "yarn" includes not only known short fiber yarns and long fiber yarns, but also carbon fiber yarns, aromatic fiber yarns, and the like. As shown in the figure, the sizing agent supply device 3 is a heating device for melting the sizing agent made of a thermoplastic polymer capable of forming a water-soluble film, such as a heating drum, a heating grill, or a heating agitation mechanism (any of these). It is composed of a tank 1 having a built-in tank (not shown) and a metering pump 2. When melting the glue, an inert gas such as nitrogen gas is introduced into the tank 1 to prevent oxidation of the glue. The glue supply device 3 needs to maintain a uniform temperature throughout the glue supply pipeline, taking into account that the hot-melt properties of glue change depending on temperature. Therefore, the tank 1 is equipped with a heat insulation jacket 4.
It is supplied to a sealed glue supply nozzle 5 via a pipe 4 surrounded by a. In addition to the completely sealed glue supply nozzle called a jet coater or fountain die, the sealed glue supply nozzle according to the present invention is a glue supply nozzle that is used along the axial direction of the applicator roll 6 as illustrated in FIG. A semi-sealed type comprising a traversing glue supply nozzle 20 and a doctor roll 22 that is disposed opposite to the glue discharge port 21 of the glue supply nozzle and forms a damming area for the glue on the surface of the applicator roll 6. It is to be understood that this also includes a sizing agent supply nozzle. The sealed glue supply nozzle 5 is a glue discharge nozzle that incorporates a heating/extrusion pump and a heating source (both not shown), and is a glue discharging nozzle that has a nozzle main body extending along the generatrix direction of the applicator roll 6 (described later). A slit-shaped adhesive discharge groove 5b is provided on the upper edge 5a.
is open.

An applicator roll 6 is disposed above the sealed glue supply nozzle 5 in sliding contact with the upper edge 5a of the nozzle body. The applicator roll 6 is made by winding and fixing a cylindrical surface member made of an elastic material such as rubber or synthetic resin onto the surface of a metal inner cylinder.
a is arranged to face the glue supply nozzle 5 with the direction of the generatrix substantially aligned with the upper edge 5a of the nozzle body. The applicator roll 6 is provided with a heating device for heating the sizing agent supplied from the sizing agent supply nozzle 5 using heat transfer from a built-in heating device or an external heat source (e.g. a coating roll designated by reference numeral 7). Preheating device (all not shown)
is provided. A coating roll 7 with a built-in heating device is rotatably supported obliquely above the applicator roll 6 so as to be in sliding contact with the applicator roll 6 with its generatrix aligned in the same direction. The coating roll 7 is supported above the coating roll 7 so as to be movable up and down with its generatrix line aligned with the coating roll 7, and a peripheral wall surface is surrounded by a surface layer member made of the same elastic material as the applicator roll 6. A backup roll 8 is rotatably supported.

By adopting the above-described sliding contact arrangement, the applicator roll 6, coating roll 7, and back-up roll 8 are arranged to form a hot-melt material that is discharged from the adhesive discharge groove 5b provided on the upper edge 5a of the nozzle body. Although it forms a transfer route for the sizing agent, it is desirable to reduce the amount of sizing agent applied to the yarn 9 as much as possible when operating the sizing agent application device. In order to reduce the coating thickness of the sizing agent when transferred to the sizing agent, the circumferential speed of the coating roll 7 and the backing roll 8 is set to be higher than the circumferential speed of the applicator roll 6 and substantially the same as the running speed of the yarn 9. The rotational speed of each roll is adjusted so that the speed is as follows.

In this way, the hot melt and the adhesive discharged from the adhesive discharge groove 5b are directed from the elastic surface 6a of the applicator roll 6 to the sliding contact area between the coating roll 7 and the elastic surface 8a of the back-up roll 8. During the transfer, the difference in peripheral speed of these rolls and the adjusted roll gap reduce the coating thickness. Therefore, the thread 9, for example, the sliding engagement line (so-called nip line) between the coating roll 7 and the back-up roll 8 that rotate at the same speed.
The warp threads 9, which pass through these rolls at substantially the same running speed, are susceptible to problems such as the generation of fuzz and a decrease in the morphological stability of the threads in the subsequent weaving process. A minimum amount of sizing agent is supplied within the range. The amount of sizing agent applied to the yarn 9 can be determined by changing the circumferential speed difference between the rolls 6, 7, and 8, the amount of sizing agent supplied from the discharge groove 5b, the gap between the applicator roll 6 and the coating roll 7, etc. It can be adjusted by

Note that when implementing the present invention, the use of the backup roll 8 may be omitted as an application example. At this time, the yarn 9 is placed on the circumferential surface of the coating roll 7.
The travel path of the thread 9 is adjusted by an appropriate guide device so that the tension is applied.

On the other hand, a size recovery tank 12 is provided near the applicator roll 6 and coating roll 7, with a heating blade 11 in sliding contact with the size support surfaces 6a, 7a of these rolls. The glue recovery tank is connected to the tank 1 of the glue supply device 3 via a pipe 13 surrounded by a heat insulating jacket 13a and a recovery pump 14. Therefore, the sizing agent supported on the circumferential surfaces 6a and 7a of the applicator roll 6 and coating roll 7 is scraped off by the heating blade 11, except for the amount supplied to the yarn 9, and is collected in the sizing agent recovery tank 12. The entire amount is collected into the tank 1 through the pipe 13 and the collection pump 14.

Furthermore, the surface temperatures of the applicator roll 6 and the coating roll 7 are set in order to maintain the temperature of the adhesive in a range suitable for spreading the paste into a thin film over the entire area of the paste from the discharge groove 5b to the back-up roll 8. , is adjusted to be at least the melting temperature of the adhesive. Thus, when applying to yarn 9,
The temperature of the glue is 80℃~150℃ and 20cps~6000cps
viscosity can be maintained.

Effects of the Invention As can be understood from the above explanation, by using the device of the present invention, the glue is sent out from the glue discharge groove 5b provided on the upper edge 5a of the nozzle body of the glue supply nozzle 5. Since it is sealed in the sealing glue supply nozzle 5 and the glue supplying device 3 in a state where it is isolated from air until it is heated, it is effectively protected from oxidation due to heating in the atmosphere. In addition, the entire amount of the sizing agent that has not been supplied to the yarn 9 and the sizing agent that has been supplied to the applicator roll 6 and the coating roll 7 when the yarn 9 is in a stopped state is stored in the tank 1 of the sizing agent supply device 3. Since it is recovered and reused, it is possible to prevent deterioration of the glue due to oxidation and to achieve economical effects that are significantly superior to conventional devices. In addition, when the operation is stopped, the back-up roll 8 separates from the coating roll 7 and the supply of sizing agent to the yarn 9 is interrupted. Quality deterioration can be effectively avoided. On the other hand, during operation, the coating roll 7 and the back-up roll 8 having the elastic surface 8a are slidably rotated at the same speed, which is higher than that of the applicator roll 6 having the elastic surface 6a. By bringing a low-speed applicator roll 6 into sliding contact with the sizing agent, a thin film-like material with a uniform thickness suitable for applying a low rate to the yarn 9 is applied to the sizing agent sent toward the application area on the yarn 9. It is possible to obtain a metastatic form. Therefore, the present invention significantly exceeds the level of conventional equipment in terms of energy saving, resource saving, and speeding up by omitting the heating and drying process of the sizing agent, as well as product quality improvement due to uniform adhesion of the sizing agent. It is possible to demonstrate an effect exceeding that of the above.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating an apparatus for applying a sizing agent at a low rate to yarn according to the present invention. FIG. 2 is a side view of a semi-sealed coating head used in the apparatus of the present invention. 1... Tank, 2... Metering pump, 3
...Glue supply device, 4...Pipe with heat insulating jacket, 5...Sealed glue supply nozzle, 5a...Nozzle upper edge, 6...Applicator roll, 7...
Coating roll, 8... back-up roll, 11... heating blade, 12... glue recovery tank, 13... pipe, 14... recovery pump.

Claims (1)

[Claims] 1. A sizing agent supply device consisting of a tank with a built-in heating device for melting a sizing agent made of a thermoplastic polymer capable of forming a water-soluble film and a metering pump, and a sizing agent supply device A sealed glue supply nozzle connected to the glue supply nozzle via a pipe with a heat insulating jacket, an applicator roll disposed facing each other in sliding contact along the nozzle upper edge of the glue supply nozzle, and a generatrix direction directed to the applicator roll. a coating roll with a built-in heating device which rotates at a higher speed than the applicator roll; a glue recovery tank equipped with a heating blade that comes into sliding contact with the glue-bearing surfaces of the applicator roll and the coating roll; A sizing agent is applied to yarn at a low rate, the sizing agent being comprised of a sizing agent recovery device comprising a pipe surrounded by a heat-insulating jacket and a recovery pump that connects a sizing agent recovery tank and the tank. device to do.