JPH0122380B2 - - 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 a low-rate application device for sizing agent that can solidify the sizing agent at room temperature or by 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.
and an applicator roll 6, which is provided with a preheating device and an elastic surface 6a, and which are disposed facing each other in sliding contact along the nozzle upper edge 5a of the glue supply nozzle, and an applicator roll 6 that is slidable with its generatrix direction aligned with the applicator roll. A coating roll 7 with a built-in heating device rotates at a peripheral speed higher than that of the applicator roll 6 and substantially the same as the running speed of the yarn, and a coating roll 7 that is slidable up and down with its generatrix direction aligned with the coating roll. A back roll 8 having an elastic surface 8a that rotates at approximately the same circumferential speed as the coating roll 7, and a back roll 8 disposed downstream of the nip line formed between the coating roll 7 and the back roll 8, The gist of this device is a device that applies a sizing agent to yarn 9 at a low rate, and is constituted by a reheating roll 10 with yarn grooves 10a that rotates at a lower speed than the traveling speed of yarn 9.

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 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. The thin film-like transition morphology is maintained. Further, the yarn 9 sent out from the nip line between the coating roll 7 and the back-up roll 8 is fed into a yarn groove 10a formed in the side trunk of the reheating roll 10, which rotates at a speed lower than the running speed of the yarn. By being guided and reheated, the size agent is remelted, and the form of impregnation or application of the size agent onto the threads 9 is made more uniform. As a result, the fluff of the yarn 9 is suppressed, and the smoothness of the surface of the yarn 9 is improved.

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. 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 glue consisting of a traversing glue supply nozzle 11 and a doctor roll 13 that is disposed opposite to the glue discharge port 12 of the supply nozzle and forms a damming area for the glue on the surface of the applicator roll 6. It is to be understood that agent delivery nozzles are also included. 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 opened at 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 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 vertically movable with its generatrix line aligned with the coating roll 7, and a surface layer member 8a made of the same elastic material as the applicator roll 6 covers the peripheral wall surface. A surrounded 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 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 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 running path of the filament 9 is adjusted by an appropriate guide device so that the tension is applied.

Furthermore, in the apparatus of the present invention, a reheating roll 10 having a large number of thread grooves 10a formed in the side trunk is provided downstream of the nip line formed between the coating roll 7 and the backup roll 8. The reheating roll is rotated at a lower speed than the running speed of the yarn 9, and the sizing agent-applied yarn 9 that has passed through the nip line between the coating roll 7 and the backing roll 8 is inserted into the yarn groove 10a of the reheating roll 10. The sizing agent is introduced one by one into the threads 9, and the sizing agent is remelted by reheating to obtain a more uniform form of adhesion and co-immersion of the sizing agent to the threads 9. As a result, the fluff of the yarn 9 is suppressed, and the smoothness of the surface of the yarn 9 is improved. Furthermore, the surface temperature of the applicator roll 6 and the coating roll 7 is determined by adjusting the temperature of the adhesive to the adhesive discharge groove 5.
In order to maintain the range suitable for thin film spreading over the entire range of movement from b to back up roll 8,
It is adjusted to be at least the melting temperature of the adhesive. 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.

Effects of the Invention As can be understood from the above explanation, by using the device of the present invention, the glue can be distributed through the glue discharge groove provided on the upper edge 5a of the nozzle body of the sealed glue supply nozzle 5. Until it is sent out from 5b, 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, so that it is effectively protected from oxidation due to heating in the atmosphere. Therefore, the device of the present invention can exhibit a remarkable effect in suppressing the deterioration of the glue due to oxidation, which has been a problem in conventional open glue tanks. Further, the coating roll 7 and the back-up roll 8 having the elastic surface 8a are rotated at approximately the same circumferential speed as the yarn 9.
By slidingly rotating the applicator roll 6 at a higher speed than the applicator roll 6 having an elastic surface 6a and slidingly contacting the coating roll 7 with the low-speed applicator roll 6, the glue is sent out toward the application area on the yarn 9. It is possible to cause the agent to acquire a thin film-like transition form having a uniform thickness, which is suitable for applying a low rate to the yarn 9. Furthermore, the yarn 9 sent out from the nip line between the coating roll 7 and the back-up roll 8 is passed through a yarn groove 10a formed in the side trunk of a reheating roll 10 that rotates at a speed lower than the running speed of the yarn. By introducing the sizing agent one by one into the thread 9 and reheating it within the thread groove, the sizing agent is remelted, and the form of impregnation or adhesion of the sizing agent to the yarns 9 is made more uniform, and the fluff of the yarn is The surface of the thread 9 is made smooth by suppressing the occurrence of the thread. Thus,
The present invention has an energy saving effect by omitting the heating and 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 effect of improving product quality by applying the sizing agent uniformly. It is capable of exhibiting effects that significantly exceed the level of conventional equipment.

[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 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...
Upper edge of nozzle, 6... Applicator roll, 7...
... Coating roll, 8 ... Backup roll, 9 ... Yarn, 10 ... Reheating roll, 10a
... Thread groove of reheating 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, which are 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
A coating roll with a built-in heating device that rotates at a circumferential speed that is approximately the same as the running speed of the yarn, and a coating roll that slides in vertically movable manner with the generatrix direction aligned with the coating roll and rotates at approximately the same circumferential speed as the coating roll. A back-up roll with an elastic surface that
A reheating roll with a thread groove is arranged downstream of the nip line formed between the coating roll and the back-up roll, and rotates at a speed lower than the running speed of the thread. A device that applies a characteristic sizing agent to yarn at a low rate.