JPH0122378B2 - - 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 yarn winding beam for the fiber manufacturing process. Therefore, a heating drying process or the provision of 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.

On the other hand, when coating or impregnating yarn that has been maintained at room temperature or below with a sizing agent that is heated to a high temperature and becomes molten, even if you try to suddenly apply the sizing agent to the yarn, the difference in temperature between the sizing agent and the yarn will cause Then,
The temperature of the size agent decreases to the average temperature of both (called the neutralization temperature), and the increase in viscosity worsens the leakage of the size agent, causing problems such as poor coating or impregnation of the yarn. .

The main object of the present invention is to provide a low-rate application device for a sizing agent that can solidify the sizing agent at room temperature or under cooling and stabilize the conditions for applying the sizing agent to the 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.
and an applicator roll 6 comprising a preheating device and an elastic surface 6a, which are disposed in sliding contact with each other and facing each other along the nozzle lip upper edge 5a of the glue supply nozzle.
and a coating roll 7 with a built-in heating device that is in sliding contact with the applicator roll with its generatrix direction aligned and rotates at a peripheral speed that is higher than the applicator roll 6 and approximately the same as the traveling speed of the yarn.
, a back-up roll 8 that is in sliding contact with the coating roll with its generatrix direction aligned with the coating roll, is supported so as to be movable up and down, rotates at approximately the same circumferential speed as the coating roll 7, and has an elastic surface 8a; The gist of this device is a device for applying a sizing agent to the yarn at a low rate, which is constituted by a guide roll 11 mounted on the introduction side of the yarn 9 of a roll so as to be vertically movable.

Function The size agent is sealed in the sealed size agent supply nozzle 5 and the size agent supply device 3 in a state where it is isolated from the air until just before being sent to the yarn 9, so that it is not affected by heating in the atmosphere. Oxidation can be effectively prevented. In addition, the coating roll 7 and the elastic surface 8
a and the back-up roll 8 having the same speed as the applicator roll 6 and at a speed substantially the same as the traveling speed of the thread 9,
By bringing the applicator roll 6 into sliding contact with the coating roll 7 at a low speed, the sizing agent sent toward the coating area on the yarn 9 has a uniform thickness suitable for applying a low rate to the yarn 9. The thin film-like transition morphology is maintained. Furthermore, prior to impregnation with the size agent, the yarn 9 is supplied to a guide roll 11, and the length of the contact area of the size agent formed on the coating roll 7 by downward pressure of the yarn 9 by the guide roll 11. This increases the contact time between the threads 9 and the size agent, thereby improving the permeability of the size agent.

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. 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 device comprising a traversing glue supply nozzle 13 and a doctor roll 15 that is arranged opposite to the glue discharge port 14 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 sizing agent supply nozzles are also included. On the other hand, the sealed glue supply nozzle 5 is a wax discharge nozzle that incorporates a heating/extrusion pump and a heating source (both not shown), and has a nozzle lip extending along the generatrix direction of the applicator roll 6 (described later). A slit-shaped wax discharge groove 5b is opened in the upper edge 5a.

An applicator roll 6 is disposed above the sealed glue supply nozzle 5 in sliding contact with the upper edge 5a of the nozzle lip. The applicator roll 6 has a cylindrical surface member made of an elastic material such as rubber or synthetic resin wound around the surface of a metal inner cylinder, and the elastic surface 6a is located at the upper edge of the nozzle lip. The nozzle 5a is disposed opposite to the glue supply nozzle 5, with the direction of the generating line substantially aligned with the direction of the generatrix. The applicator roll 6
includes a preheating 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). (all of which are not shown) are 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.

The applicator roll 6, the coating roll 7, and the back-up roll 8 are arranged in the above-described sliding contact arrangement, so that the hot-melt glue discharged from the glue discharge groove 5b provided on the upper edge 5a of the nozzle lip However, when operating the sizing agent application device, it is desirable to reduce the amount of sizing agent applied to the threads 9 as much as possible. In order to reduce the coating thickness of the sizing agent during transfer, the circumferential speeds of the coating roll 7 and backing roll 8 are set to be higher than the circumferential speed of the applicator roll 6 and approximately the same as the running speed of the yarn 9. The rotation speed of each roll is adjusted so that

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 yarn 9, for example, the warp yarn 9 that passes through the sliding engagement line (so-called nip line) between the coating roll 7 and the back-up roll 8 while maintaining substantially the same running speed as these rolls, The minimum amount of sizing agent is supplied within the range that does not cause problems such as generation of fuzz or reduction in the morphological stability of the yarn in the subsequent fiber-making process. The amount of sizing agent applied to the yarn 9 is determined by the roll 6,
It can be adjusted by changing the circumferential speed difference between 7 and 8, the amount of glue supplied from the discharge groove 5b, the gap between the applicator roll 6 and the coating roll 7, etc.

On the other hand, on the side where the yarn 9 is introduced into the back-up roll 8, there is a fluid pressure cylinder mechanism and a
A guide roll 11 supported so as to be able to move up and down by a known elevating drive device (not shown) such as a pinion mechanism is disposed with its generatrix aligned with the direction of the back-up roll 8. Furthermore, in a preferred embodiment of the present invention, a yarn preheating device such as a preheating roll 12 or an infrared heating device (not shown) is provided on the yarn introduction side of the guide roll. 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 guide roll 1 is placed so that the tension of the yarn 9 acts on the circumferential surface of the coating roll 7.
The travel path of the yarn 9 is adjusted by a suitable guide device such as 1. Further, it is also possible to incorporate a yarn heating device into the guide roll 11.

Prior to impregnation with the sizing agent, the yarn 9 is preheated by the preheating device 12 to obtain an elevated neutralization temperature without the risk of increasing the viscosity of the sizing agent. In addition, when impregnating the adhesive, the guide roll 11
is lowered to a position where a V-shaped bend occurs in the travel path of the yarn 9, thereby increasing the length l of the contact area of the sizing agent formed between the yarn 9 and the coating roll 7. By extending the contact time between the heated yarn 9 and the sizing agent, the permeability of the sizing agent into the yarn 9 is improved.

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. In this way, when applying to the 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 apparatus of the present invention, the length l of the contact area between the yarn and the coating roll during impregnation with the sizing agent is increased. Therefore, the contact time between the yarn and the sizing agent is extended, and the permeability of the sizing agent into the yarn is significantly improved. Further, according to the present invention, the neutralization temperature between the sizing agent and the yarn increases, thereby effectively suppressing an increase in the viscosity of the sizing agent.

In this way, the present invention significantly exceeds the level of conventional equipment in the energy saving effect by omitting the heat drying process of the sizing agent, and the effect of improving product quality by improving the permeability of the sizing agent. It is possible.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating the apparatus of the present invention.
FIG. 2 is a side view of a semi-sealed glue supply nozzle 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...
Upper edge of nozzle, 6... Applicator roll, 7...
... Coating roll, 8 ... Backup roll, 9 ... Yarn, 11 ... Guide roll, 12 ...
…Preheating 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; an applicator roll having a sealed glue supply nozzle connected via a pipe with a heat insulating jacket, a preheating device and an elastic surface disposed facing each other in sliding contact along the upper edge of the nozzle lip 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 circumferential speed that is faster than the applicator roll and approximately the same as the running speed of the yarn; A back-up roll having an elastic surface that slides in vertically movable manner in the same direction and rotates at approximately the same circumferential speed as the coating roll; 1. A device for applying a sizing agent to yarn at a low rate, the device comprising a mounted guide roll.