JPH0122381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for applying a sizing agent to yarn at a low rate, and more specifically, a sizing agent ( The present invention relates to a device for applying a low percentage of a sizing agent (hereinafter abbreviated as a sizing agent) to yarn.

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.

The main object of the present invention is to provide an apparatus for applying a sizing agent at a low rate, which can solidify the sizing agent at room temperature or under cooling, and can 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.
and an applicator roll 6, which is provided with a preheating device and an elastic surface 6a, and which are arranged in sliding contact with each other along the nozzle upper edge 5a of the glue supply nozzle, and which are in sliding contact with the applicator roll with the generatrix direction aligned with the applicator roll. , and a coating roll 7 with a built-in heating device that rotates at a higher speed than the applicator roll 6 and at a circumferential speed that is substantially the same as the traveling speed of the yarn.A sizing agent is applied to the yarn 9 at a low rate. The gist is the 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. can be effectively prevented. In addition, the coating roll 7 and the elastic surface 8a
The back-up roll 8 having the same speed as the coating roll 7 is rotated in sliding contact with the coating roll 7 at a speed higher than that of the applicator roll 6 and at approximately the same speed as the running speed of the yarn 9. In this way, the sizing agent sent out toward the application area to the yarn 9 maintains a thin film-like transfer form having a uniform thickness, which is suitable for applying a low coating rate to the yarn 9.

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 supplied 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 consisting of a traversing glue supply nozzle 10 and a doctor roll 12 that is disposed opposite to the glue discharge port 11 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 5 is provided on the upper edge 5a.
b 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, and the elastic surface 6
a is disposed 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 in a state aligned with the direction of the coating roll 7 and the generatrix, 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 approximately the same speed as the running speed of the yarn 9. The rotational 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 warp threads 9, which pass through the sliding engagement line (so-called nip line) between the coating roll 7 and the back-up roll 8 while maintaining approximately the same running speed as these rolls, have a following thread. In the weaving process, the minimum amount of sizing agent is supplied within a range that does not cause problems such as generation of fuzz or reduction in the morphological stability of the yarn. The amount of sizing agent applied to the yarn 9 is determined by the amount of the sizing agent applied to the yarn 9.
This can be adjusted by changing the circumferential speed difference, the amount of glue supplied from the discharge groove 5b, the gap between the applicator roll 6 and the coating roll 7, etc.

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 filament 9 is adjusted by providing a suitable guide device so that the tension is applied. 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 applied to yarn 9, the sizing agent is heated to 80°C.
Temperatures from 150°C to 150°C and viscosity from 20 cps to 6000 cps 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 can be transferred to the glue discharge groove 5b provided on the upper edge 5a of the nozzle body of the sealed glue supply nozzle 5. Since it is sealed in the sealed glue supply nozzle 5 and the glue supply device 3 in a state where it is isolated from air until it is sent out, it is effectively protected from oxidation due to heating in the atmosphere. Therefore,
The device of the present invention can exhibit remarkable effects on the deterioration of the glue due to oxidation, which has been a problem with conventional open glue tanks. Further, the coating roll 7 and the back-up roll 8 having an elastic surface 8a are slidably rotated at a circumferential speed that is approximately the same as the running speed of the yarn 9 and at a higher speed than the applicator roll 6 having an elastic surface 6a. At the same time, by bringing the low-speed applicator roll 6 into sliding contact with the coating roll 7, 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. It is possible to obtain a thin film-like transition form having . Thus, the present invention has an energy saving effect by omitting the heat drying process of the sizing agent, an increase in speed, a resource saving effect by reducing the amount of sizing agent supplied to the yarn, and an improvement in product quality by applying the sizing agent uniformly. In terms of effectiveness, it can exhibit effects that greatly exceed those of conventional devices.

[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... Back-up roll.

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, and an applicator roll having a preheating device and an elastic surface disposed facing each other in sliding contact along the upper edge of the glue supply nozzle. , slidingly contacts the applicator roll with the generatrix direction aligned with the applicator roll, and at a higher speed than the applicator roll, and
1. A device for applying a sizing agent to yarn at a low rate, comprising a coating roll with a built-in heating device that rotates at a circumferential speed that is substantially the same as the traveling speed of the yarn.