JPH0122377B2 - - 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 such as that 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 more specifically, for example, in a conventional sizing agent supply device, the yarn follows a certain traveling path perpendicular to the engagement line (so-called nip line) between the coating roll and the back-up roll. Since the yarn is introduced into the area where the sizing agent is applied through the sizing agent, the pressure contact point of the yarn against the sizing agent supporting surface of the coating roll and back-up roll always occupies the same position.
Therefore, only the sizing agent supported on the pressure contact point of the yarn is attached to and impregnated with the yarn, and the sizing agent supported on the surface of the roll that is removed from the pressure contact point is not applied to the yarn and is exposed to the atmosphere. When exposed to water, it oxidizes and causes problems such as viscosity changes and deterioration.
On the other hand, at the pressure contact point, the size is constantly transferred from the size carrying surface to the yarn, so the wetting characteristics of the size on the roller surface change, resulting in adhesion spots and coating. Problems such as defects may occur. Furthermore, if the yarn runs in the same position on the coating roll and back-up roll, wear occurs only on a limited portion of the surface of these rolls, causing the problem that the sizing agent cannot be applied uniformly. do.

The main object of the present invention is to provide a low-rate application device for sizing agent that can solidify the sizing agent at room temperature or under cooling and stabilize the conditions for applying the sizing agent to yarn.

Means for Solving the Problems In view of the above object, the present invention provides a tank 1 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 metering device. A sizing agent supply device 3 consisting of a delivery pump 2
and a sealed glue supply nozzle 5 connected to the glue supply device via a pipe 4 with a heat insulating jacket.
, an applicator roll 6 disposed oppositely in sliding contact along the nozzle upper edge 5a of the sealed glue supply nozzle, and an applicator roll 6 running at a speed higher than the applicator roll and at the same speed as the running speed of the yarn 9. a coating roll 7 with a built-in heating device that rotates at high speed;
A back-up roll 8 that is in sliding contact with the coating roll with its generatrix direction aligned with the coating roll and rotates at the same speed as the coating roll, and a traverse device disposed on the upstream side of an engagement line between the back-up roll and the coating roll 7. The gist of the present invention is an apparatus for applying a sizing agent constituted by 14 to yarn at a low rate.

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. Also,
By giving traverse motion to the thread 8,
The pressure contact point of the yarn 9 formed at the engagement site between the coating roll 7 and the back-up roll 8 changes at a predetermined time period, which is caused by a change in the wetting characteristics of the glue on the surface of the roller. Prevents adhesion spots, poor coating, and uneven roll wear.

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. Furthermore, 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. For this purpose, the tank 1 is connected to a sealed glue supply nozzle 5 via a pipe 4 surrounded by a heat insulating jacket 4a. On the other hand, the sealed glue supply nozzle 5 is a glue discharge nozzle that includes a built-in heating/extrusion pump and a heating source (both not shown), and is a nozzle that extends along the generatrix direction of the applicator roll 6 (described later). A slit-shaped adhesive discharge groove 5b is opened at the upper edge 5a of the main body. The sealed glue supply nozzle in the present invention includes a completely sealed glue supply nozzle called a jet coater or fountain die, as well as
Applicator roll 6 as illustrated in FIG.
A glue supply nozzle 10 that traverses along the axial direction of the applicator roll 6, and a doctor roll 12 that is disposed opposite to the glue discharge port 11 of the supply nozzle and forms a damming area for the glue on the surface of the applicator roll 6. It should be understood that this also includes semi-sealed glue dispensing nozzles.

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. On the other hand, 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 thickness of the wax coating when transferring it to the coating roll 7,
The rotation speed of each roll is adjusted so that the circumferential speed of the back-up roll 8 is higher than the circumferential speed of the applicator roll 6 and is substantially the same as the running speed of the yarn 9.

In this way, the hot-melt adhesive discharged from the adhesive discharge groove 5b is 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.
Appropriate guide device (not shown) so that the tension of
The travel path of the thread 9 is adjusted by

In order to uniformly supply the sizing agent, prevent deterioration due to oxidation, and reduce the amount of sizing agent consumed, the sizing agent application device according to the present invention is provided with a traverse device 14 for the yarn 9 in addition to the above configuration. ing. As illustrated in FIG. 2, the traverse device moves along the width direction of the alignment surface of the yarns 9 so as to be located upstream of the engagement line (nip line) between the coating roll 7 and the back-up roll 8. It is supported so that it can swing freely. The traverse device 14 supports a plurality of threads 9, 9,..., which run while maintaining a predetermined interval, in a state where they are separated from each other, and supports the individual threads 9, 9,...
The pins 15,
15... or by fixing a yarn spacing member such as a guide groove (not shown) onto the traverse bar 16. During operation of the sizing agent applicator, for example, the traverse bar 16 transfers the driving force of a motor to the traverse bar 16 via a reciprocating device with a speed reducer (both not shown). . Due to this traverse movement, the threads 9, 9...
The pressure contact points of the yarns 9, 9, .

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 roller 8. , is adjusted to be at least the melting temperature of the adhesive. In this way, when applying to the yarn 9,
The temperature of the glue is 80℃~150℃ and 20cps~6000cps
viscosity can be maintained.

The traverse device 14 can also be used in a conventional kiss-type sizing agent that supplies sizing agent by lightly contacting the coating roll 7 to the yarn 9. A uniform application function can be demonstrated.

Effects of the Invention As can be understood from the above explanation, by using the device of the present invention, the glue can be discharged from the glue discharge groove 5b provided on the upper edge 5a of the nozzle body of the glue supply nozzle 5. Until it is sent out, it is sealed in the sealed glue supply nozzle 5 and the wax supply device 3 in a state where it is isolated from air, so that it is effectively protected from oxidation due to heating in the atmosphere. Also,
By giving each yarn 9, 9...... a traverse motion that is at least greater than the distance between the yarn and the adjacent yarn, the wettability of the size agent on the surface of the coating roll 7 becomes constant, A certain amount of sizing agent is applied to the surface of the coating roll 7 at a low rate. Therefore, the entire amount of the sizing agent carried on the surfaces of the coating roll 7 and the back-up roll 8 is uniformly adhered to and impregnated into the threads 9, 9, etc., so there are no problems such as spots of adhesion or poor coating. This also prevents uneven wear of the rolls.

Thus, the present invention significantly exceeds the level of conventional equipment in terms of energy saving, resource saving, speeding up, and product quality improvement through uniform adhesion of the sizing agent by omitting the heating and drying process of the sizing agent. It can produce a rotating effect.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating a device for applying a sizing agent at a low rate to yarn according to the present invention, and FIG. 2 is a plan view illustrating the structure of a main part of the traverse device. FIG. 3 is a side view of the semi-hermetic coating head. 1... Tank, 2... Metering pump, 3
... Glue supply device, 4 ... Pipe with heat insulation jacket, 5 ... Sealed glue supply nozzle, 5a ... Nozzle upper edge, 6 ... Applicator roll, 7 ... Coating roll, 8 ... Backup roll ,
9... Yarn, 14... Traverse device.

Claims (1)

[Claims] 1. A sizing agent supply device consisting of 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 metering pump; A sealed glue supply nozzle connected via a pipe with a heat insulating jacket, an applicator roll disposed facing each other in sliding contact along the upper edge of the glue supply nozzle, and a generatrix direction aligned with the applicator roll. A coating roll with a built-in heating device that is in sliding contact and rotates at a higher speed than the applicator roll and at a circumferential speed that is the same as the running speed of the yarn; A sizing agent characterized in that it is constituted by a back-up roll that rotates at the same speed as the back-up roll, and a traverse device disposed upstream of the engagement line between the back-up roll and the coating roll. A device that gives a low rate to the rows.