JPH0122376B2 - - 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 threads at a low rate, and more particularly, to a sizing agent made of a thermoplastic polymer capable of forming a water-soluble film. agent (hereinafter referred to as
This invention relates to a device for applying a low percentage of a sizing agent (abbreviated as 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 a water-soluble sizing agent needs to be completely solidified by heating and drying before being supplied to the warp winding beam for the weaving process.For this reason, in the conventional weaving preparation process, A heating drying process or the provision of a heating drying device was considered 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 thickeners, recent efforts have been made to use thermoplastic polymers capable of forming water-soluble films, such as paraffin wax, as a main component, and to which an appropriate amount of methyl acrylate is added. ,
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 having 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, but an open sizing tank as described in Japanese Patent Publication No. 52-10942 can be used as a device for supplying sizing agents to yarns. When used, the contact state of yarns, such as warp threads, with the sizing agent carrying surface of the heating roller becomes unstable, causing new problems such as variations in the amount of sizing agent adhered and oxidation of the sizing agent due to heating. A point occurs.

On the other hand, the use of a sealed glue supply nozzle is being considered as a means of avoiding the above-mentioned problems caused by the use of an open glue tank, but in this case, the objects to be processed are limited to fabrics or films. was. Even if you try to use a sealed size supply nozzle as a yarn processing device, with conventional ones, the high temperature size supply nozzle is always in sliding contact with the applicator roll or faces the applicator roll at a fixed position, so it is difficult to use, especially during preparation or temporarily. While stopped, the applicator roll is heated at a certain position and deformed due to partial heating, which causes the distance between the applicator roll and the lip of the glue supply nozzle to change, preventing the spread of the glue into a uniform thin film. It has been recognized that there are problems in that the spread of the system may be hindered.

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.

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 opposite to the upper edge 5a of the nozzle lip of the glue supply nozzle in sliding contact with the nozzle lip upper edge 5a of the glue supply nozzle, a loading trolley 11 for the sealed glue supply nozzle 5, and the trolley being rotated about a pivot 12. The gist of this device is a device that applies a sizing agent to yarn at a low rate, and is constituted by a swinging arm 13 that is swingably and movably supported.

Operation When the glue applicator is stopped, by rotating the swinging arm 13 by a predetermined angle about the rotation center of the pivot shaft 12, the upper edge 5a of the nozzle lip of the sealed glue supply nozzle 5 is connected to the applicator roll 6. In this state, the sealed glue supply nozzle 5 is connected to the applicator roll 6 by moving the trolley 11.
Pull it out to a position where it will not interfere with the nozzle lip, and prepare for work such as correcting the nozzle lip installation position. According to the device of the present invention, a wide working space with good operability is secured by pulling out the sealed glue supply nozzle 5 outside the system, so the installation accuracy of the nozzle lip is greatly improved compared to conventional devices. can be improved. Furthermore, in the device of the present invention, an appropriate distance is maintained between the hot nozzle lip and the applicator roll 6 when the sizing agent applicator is stopped, thereby reliably preventing deformation of the applicator roll 6 due to heating. be able to.

Embodiment FIG. 1 is a side view illustrating the apparatus of the present invention.
The term "paste" 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 adhesive, an inert gas such as nitrogen gas is introduced into the tank 1 to prevent deterioration of the adhesive due to oxidation. 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.

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 is installed on a nozzle lip extending along the generatrix direction of the applicator roll 6 (described later). A slit-shaped adhesive discharge groove 5b is opened in the 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 is equipped with a preheating device (for uniformly heating the surface of the applicator roll 6 using heat transfer from a built-in heating device or an external heat source, such as a coating roll designated by reference numeral 7). (all of which are not shown) are provided.

In the glue applying device having such a basic structure, the sealed glue supply nozzle 5 is connected to the cart 11.
Correspondingly, the trolley 11
is movably disposed on an L-shaped swinging arm 13 that is swingably supported around a pivot 12. To explain in more detail, a running rail 14 for the bogie 11 is laid along the longitudinal direction on the upper surface of the L-shaped swinging arm 13, and is placed at an appropriate position in the rail laying area, for example, at the inner end of the rail laying area. A first air cylinder mechanism 16 is disposed below to drive a detachable lock arm 15 for fixing the nozzle lip of the glue supply nozzle 5 in sliding contact with the applicator roll 6 in a facing arrangement. has been done. Further, the tip 18a of the piston of the second air cylinder mechanism 18 having a swing center O on the base plate 17 is connected to the L-shaped swing arm 1.
The lever mechanism is pin-jointed to the substantially horizontally extending truck support portion 13a of No. 3, thereby forming a lever mechanism that causes the L-shaped swing arm 13 to swing motion about the pivot shaft 12. When the glue applicator is stopped or when maintenance work is being carried out, compressed air is introduced into the air chamber on the piston retreat side of the second air cylinder mechanism 18, so that the L-shaped swing arm 13 is A clockwise rotational movement is generated about the pivot 12, and a distance between the applicator roll 6 and the nozzle lip of the glue supply nozzle 5 is ensured for drawing out the glue supply nozzle 5. Next, by introducing compressed air into the piston advance side air chamber of the first air cylinder mechanism 16, the lock arm 15 is caused to rotate clockwise about the pin 19, thereby locking the truck 11. Release the condition. As a result, the glue supply nozzle 5 loaded on the truck 11 is connected to the traveling rail 1
4, it is pulled out to a position out of engagement with the applicator roll 6. In this state, the glue supply nozzle 5 waits for the operation to resume, or the nozzle lip attachment position is corrected as necessary.

In addition, a support device for the glue supply nozzle 5 consisting of a truck 11 and an L-shaped swing arm 13 is provided with a device for adjusting the vertical gap and the relative position in the front and back direction between the glue supply nozzle 5 and the applicator roll 6. An adjustment screw and an arm stopper (both not shown) are provided, and by operating these adjustment mechanisms, the position of the sliding tangent between the glue discharge groove 5b and the applicator roll 6 can be adjusted forward, backward, up or down. Can be finely adjusted.

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. And above the coating roll 7,
A back-up roll 8 is rotatably supported so as to be vertically movable with its generatrix aligned with the coating roll 7, and whose peripheral wall surface is surrounded by a surface layer member made of an elastic material similar to that of the applicator roll 6. 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 thickness of the sizing agent coating during transfer, the peripheral speeds of the coating roll 7 and backup roll 8 are set to be higher than the peripheral speed of the applicator roll 6 and substantially the same as the running speed of the yarn 9. The rotational speed of each roll is adjusted to match the speed.

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.
The travel path of the thread 9 is adjusted by an appropriate guide device so that the tension is applied. Furthermore, the surface temperatures of the applicator roll 6 and coating roll 7 are as follows:
In order to maintain the temperature of the size agent in a range suitable for spreading into a thin film over the entire range of movement from the size discharge groove 5b to the backup roll 8, the temperature is adjusted to be at least equal to or higher than the melting temperature of the size agent. ing. 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 is sent out from the glue discharge groove 5b provided on the upper edge 5a of the nozzle lip of the glue supply nozzle 5. Since it is sealed in the sealed size supply nozzle 5 and the size supply device 3 in a state where it is isolated from air, it is effectively protected from oxidation due to heating in the atmosphere. Therefore, the device of the present invention can exhibit a remarkable effect on the deterioration of the glue due to oxidation, which has been a problem with conventional open glue tanks.

Also, when the adhesive applicator is stopped, the swing arm 13
By rotating the roller by a predetermined angle about the pivot 12 and releasing the locking state of the carriage 11 by the lock arm 15, the glue is applied between the applicator roll 6 and the nozzle lip of the glue supply nozzle 5. It is possible to secure the drawing interval of the supply nozzle 5. As a result, the glue supply nozzle 5 loaded on the truck 11 is pulled out to the disengagement device with the applicator roll 6 as the truck 11 rolls on the traveling rail 14.
In this state, the glue supply nozzle 5 waits for the operation to resume, or the nozzle lip attachment position is corrected as necessary. In this way, the present invention can prevent deformation of the applicator roll 6 due to sliding contact at a certain position with a high-temperature nozzle lip or arrangement of the nozzle lip facing each other, as well as fluctuations in the state of sliding contact between the applicator roll 6 and the nozzle lip due to the deformation. It has a remarkable effect on the spreading of adhesive into a thin film.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating a sizing agent applying device according to the present invention. 1... Tank, 2... Metering pump, 3
... Glue supply device, 4 ... Pipe with heat insulation jacket, 5 ... Sealed glue supply nozzle, 5a ... Upper edge of nozzle lip, 6 ... Applicator roll,
11...Dolly, 12... Pivot, 13... Swinging arm.

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 in sliding contact with the upper edge of the nozzle lip of the glue supply nozzle, and an applicator roll of the sealed glue supply nozzle. To apply a sizing agent to threads at a low rate, characterized by comprising a loading cart and a swinging arm that supports the cart so that it can swing freely around a pivot axis and move freely. Device.