JPS62125067A - Apparatus for applying size to yarn in low ratio - 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 - No. 1 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 (hereinafter referred to as This invention relates to a device for applying a low percentage of sizing agent (abbreviated as sizing agent) to yarn.

Conventional Ω Limbs 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 a water-soluble sizing agent is heated and dried before being supplied to the yarn winding beam to the weaving process.
It is necessary to completely solidify the material, and for this reason, in the conventional weaving preparation process, a heating drying step or provision of a heating drying device has been 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 sizing agents, recent efforts have been made to use thermoplastic polymers capable of forming water-soluble films, such as paraffin wax, as a main component, with an appropriate amount of methyl acrylate, Meltable glues made from thermoplastic polymers of stearyl methacrylate, stearic acid, methacrylic acid, styrene, and the like are being used.

B(n', = Rukuchi) By using a sizing agent made of a thermoplastic polymer that has the ability to form a water-soluble film as described above, various inconveniences caused by the use of water-soluble sizing agents can be solved. can be done, but
As a device for supplying sizing agent to yarn, for example, the Japanese Patent Publication No. 52-1
When an open type glue tank such as that described in Publication No. 0942 is used, the contact state of the threads, for example, the warp threads, with the glue carrying surface of the heating roller becomes unstable, resulting in variations in the amount of glue attached. A new problem arises in that the sizing agent is oxidized by heating.

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 non-uniformly to the yarn. Also, is there a part of the circumferential surface in the hot melt adhesive? Since the sizing agent is stirred by the heating roller subjected to +'rR, deterioration of the sizing agent 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, since there is a gap between the yarns, the amount of size agent carried away by the yarns (9) and the amount of coating on the coating roll (7) It is divided into a portion remaining on the surface of the roll (7) and a portion remaining on the surface of the 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 changes. An imbalance tends to occur between the amount applied to the yarn, and the spreading of the sizing agent into a thin film is often 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.

Mu! In view of this purpose, 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 pump. (2); a sealed glue supply nozzle (5) connected to the glue supply device via a heat-insulating jacketed pipe (4); Applicator rolls (6) are arranged oppositely in sliding contact along the nozzle upper edge (5a) of the nozzle, and are in sliding contact with the applicator rolls with their generatrix directions aligned and rotate at a higher speed than the applicator rolls (6). A glue recovery tank (1) equipped with a coating roll (7) with a built-in heating device and a heating blade (11) that comes into sliding contact with the glue carrying surfaces of the applicator roll (6) and the coating roll (7).
2), and a vibrator (13) surrounded by a heat insulation jacket (13a) that connects the glue collection tank and the tank (1).
The gist of the present invention is an apparatus for applying a sizing agent to yarn at a low rate, which is constituted by a sizing agent recovery device comprising a sizing agent and a sizing agent recovery device including a recovery pump (14).

1) 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 the air until just before being sent to the yarn (9). Oxidation due to heating inside is effectively prevented. When the operation is stopped, the backup roll (8) is used as the coating roll (7).
The application of the sizing agent to the yarn (9) is interrupted by pulling it away from the yarn (9).

On the other hand, the sizing agent supported on the circumferential surfaces of the applicator roll (6) and the coating roll (7) is scraped off by the heating blade (11) except for the amount to be supplied to the thread (9), and the sizing agent is scraped off by the heating blade (11) and It is collected into the tank (1) of the sizing agent supply device (3) via the collection pump (14).

Therefore, deterioration of the adhesive due to heating in the atmosphere is reliably prevented.

Figure 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, true 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 glue supply device (3) is
A tank (1) that incorporates a heating device for melting a 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 stirring mechanism (all not shown). and metering pump (2)
It consists of When melting the glue, use a tank (1
) to prevent oxidation of the adhesive by introducing an inert gas such as nitrogen gas into the container. The sizing agent supply device (3) needs to maintain a uniform temperature throughout the sizing agent supply pipeline, taking into account that the true melting properties of the sizing agent change depending on the temperature. For this purpose, the tank (1) is connected to a sealed glue supply nozzle (5) via a pipe (4) surrounded by a heat insulation jacket (4a). In addition to the completely sealed glue supply nozzle called a jet coater or fountain die, the sealed glue supply nozzle in the present invention can be applied to the axis of the applicator roll (6) as illustrated in FIG. The applicator roll (
6) and a doctor roll (22) forming a damming area for the adhesive on the surface thereof. 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 includes a built-in heating/extrusion pump and a heating source (both not shown). A slit-shaped glue discharge groove (5b) is opened at the upper edge (5a) of the extending nozzle body.

An applicator roll (6) is disposed above the sealed glue supply nozzle (5) in sliding contact along the upper edge (5a) of the nozzle body. The applicator roll (6) has a cylindrical surface member made of an elastic material such as rubber or synthetic resin fixed to the surface of a metal inner cylinder, and its elastic surface (6a) is It is arranged opposite to the glue supply nozzle (5) with the direction of the upper edge (5a) of the nozzle body and the generatrix substantially aligned. The applicator roll (6) is equipped with a sizing agent supply nozzle (5) using heat transfer from a built-in heating device or an external heat source, such as a coating roll designated by reference number (7).
) is provided with a preheating device (all not shown) for heating the sizing agent supplied from the sizing agent. Diagonally above the applicator roll (6), the applicator roll (6)
A coating roll (7) with a built-in heating device is rotatably supported so as to be in sliding contact with the rollers with the generatrices aligned in the same direction. A surface layer made of the same elastic material as the applicator roll (6) is supported above the coating roll (7) so as to be movable up and down with its generating line aligned with that of the coating roll (7). A bank unroll (8) whose peripheral wall surface is surrounded by members is rotatably supported.

The applicator roll (6), coating roll (7), and bank up roll (8) have the above-mentioned sliding contact arrangement, so that the upper edge (5) of the nozzle body
It forms a transfer path for the hot-melt sizing agent discharged from the sizing agent discharge groove (5b) provided in the sizing agent discharging groove (5b) provided in a). It is desirable to reduce the application amount as much as possible, and for this reason, in order to reduce the thickness of the paste coating when transferred from the applicator roll (6) to the coating roll (7), the coating roll (7) and the backup roll are used. (8)
The rotational speed of each roll is adjusted so that the peripheral speed of the applicator roll (6) is higher than the peripheral speed of the applicator roll (6) and is substantially the same as the running speed of the yarn (9).

In this way, the true melt adhesive discharged from the adhesive discharge groove (5b) is transferred from the elastic surface (6a) of the applicator roll (6) to the coating roll (7) and back unroll (8). During the transition towards the area of sliding contact with the elastic surface (8a), the difference in the circumferential speed of these rolls and the adjusted roll gap cause a reduction in the coating thickness. Therefore, the yarn (9), for example, the sliding engagement line (so-called double line) between the coating roll (7) and the backup roll (8), which rotate at the same speed, is set to run at substantially the same running speed as these rolls. The warp yarns (9) that are maintained and passed through are supplied with the minimum amount of sizing agent to the extent that problems such as generation of fuzz and decrease in the form stability of the yarns do not occur in the subsequent weaving process. Ru. The amount of sizing agent applied to the yarn (9) is determined by the difference in circumferential speed of the rolls (6), (7), and (8), the amount of sizing agent supplied from the discharge groove (5b), and the applicator roll (
It can be adjusted by changing the gap between the coating roll (7) and the coating roll (7).

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

On the other hand, a heating blade (11) is placed in the vicinity of the applicator roll (6) and coating roll (7) with a heating blade (11) in sliding contact with the adhesive supporting surfaces (6a) and (7a) of these rolls. A recovery tank (12) is provided.

The size recovery tank is connected to the tank (1) of the size supply device (3) via a pipe (13) surrounded by a heat insulation 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 removed by the heating blade (11), except for the amount supplied to the yarn (9). The glue flows down into the glue recovery tank (12), passes through the pipe (13) and the recovery pump (14), and the entire amount is recovered into the tank (1).

In addition, the surface temperature of the applicator roll (6) and coating roll (7>
In order to maintain a range suitable for FJ film spreading throughout the entire movement from b) to back unroll (8), the temperature is adjusted to at least be equal to or higher than the melting temperature of the sizing agent. Thus, when applied to the yarn (9), the sizing agent can maintain a temperature of 80° C. to 150° C. and a viscosity of 20 cps to 6000 cps.

As can be understood from the above explanation, by using the device of the present invention, the sizing agent can be dispensed from the sizing agent provided at the upper edge (5a) of the nozzle body of the sizing agent supply nozzle (5). tj (5b)
Until it is sent out, it is sealed in the sealed size supply nozzle (5) and size supply device (3) in a state where it is isolated from air, so it is effectively protected from oxidation due to heating in the atmosphere. Ru. In addition, the entire amount of the sizing agent that was not supplied to the yarn (9) and the sizing agent that was supplied to the applicator roll (6) and the coating roll (7) when the yarn (9) was in a stopped state is the sizing agent. Since it is collected in the tank (1) of the adhesive supply device (3) and reused, it prevents deterioration of the adhesive due to oxidation and is significantly more economical than conventional equipment. It can be effective. In addition, when the operation is stopped, etc., back-up roll (8
) is separated from the coating roll (7), and the yarn (9)
Since the supply of sizing agent is interrupted, it is possible to effectively avoid product quality deterioration due to localized large amount of sizing agent impregnation. In contrast, during operation, the coating roll (7) and the backup roll (8) with an elastic surface (8a) are moved at the same speed, which is faster than the applicator roll (6) with an elastic surface (6a). By slidingly rotating and slidingly contacting the coating roll (7) with a low-speed applicator roll (6), the sizing agent sent toward the coating area on the yarn (9) is applied to the yarn (9). It is possible to obtain a thin film-like transition form having a uniform thickness, which is suitable for imparting a low rate of . Thus, 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 improving product quality through uniform adhesion of the sizing agent. It can be used effectively.

[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) Fixed amount delivery pump, (
3) - Glue supply device, (4) - Pipe with heat insulation jacket, (5) - Sealed glue supply nozzle, (5a)
- upper edge of nozzle, (6) - - applicator roll,
(7) - Coating roll, (8) - Bank unroll, (11) - Heating blade, (12) - Glue recovery tank, (13) - 0- 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;
a sealed glue supply nozzle connected to the glue supply device via a heat-insulating jacketed pipe; an applicator roll disposed facing each other in sliding contact along the upper edge of the glue supply nozzle; A coating roll with a built-in heating device that slides into contact with the applicator roll with its generatrix direction aligned and rotates at a higher speed than the applicator roll;
From a glue recovery tank equipped with a heating blade that comes into sliding contact with the glue carrying surfaces of the applicator roll and coating roll, a pipe surrounded by a heat insulation jacket that connects the glue recovery tank and the tank, and a recovery pump. 1. A device for applying a sizing agent to yarn at a low rate, comprising: a sizing agent recovery device;