JPS63252577A - Method for coating of adhesive - Google Patents

Abstract

PURPOSE:To enhance the capacity of a reinforced hose, in a process for forming a reinforcing layer composed of reinforcing yarns in the reinforced hose, by allowing an adhesive to fall on the outer surface of a conical shape part formed of the reinforcing yarns from yarn delivery to yarn throwing from the nozzle arranged at a specific position. CONSTITUTION:Two nozzles 16, 16 connected to the tank 15 of an adhesive F are arranged in the vicinity of both edges of an almost conical shape formed of a large number of reinforcing yarns S at the upper positions between the yarn delivery positions of bobbins 13 and the yarn throwing position X to a pipe body A. A blade machine 11 is operated to allow the adhesive F to flow out and fall from the nozzles 16, 16 without interruption. Hereupon, by the feed of the pipe body A and the rotation of carriers 12, the adhesive F is applied to the outer surfaces of the reinforcing yarns S of the almost conical shape part D from the lower positions of the nozzles 16, 16 to the yarn throwing position Y so as to coat the conical shape part in an umbrella form without generating gaps. Subsequently, the yarns are thrown to the pipe body A in this state.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> In the process of forming a reinforcing layer consisting of a large number of reinforcing threads in a reinforcing hose, the present invention applies an adhesive to the reinforcing threads without any hindrance before being driven into the pipe body. The present invention relates to an adhesive application method that can apply an adhesive.

<Prior art> Conventionally, in the process of forming a reinforcing layer consisting of a large number of reinforcing threads to be drilled into a reinforcing hose, the method of applying adhesive to the reinforcing threads before being driven into the pipe body is shown in Fig. 4. The one described in Japanese Patent Publication No. 33-7485 is known.

In this method, the tube body A is conveyed vertically upward at the center position of a large number of carriers 2 rotating on a horizontal plane, and the tube body A
In a blade machine 1 that drives in a large number of reinforcing yarns S that are paid out from a bobbin 3 held by a carrier 2 on the outer periphery, each reinforcing yarn is This is done by placing the annular tube 4 in pressure contact with S from below. This annular tube 4
is connected to a tank 5 storing the adhesive F, and has a large number of small holes (not shown) through which the adhesive F flows out on the outer surface.

When the blade machine 1 is operated, the adhesive F is caused to flow out from a small hole (not shown) on the outer surface of the annular tube 4, each reinforcing thread S is brought into contact with the outer surface of the annular tube 4, and the adhesive is applied to each reinforcing thread S. F is applied.

The reason why the adhesive F is applied to the reinforcing threads S is that it is convenient to increase the adhesive force of the reinforcing layer B to the tube body A, and to increase the adhesive force between each reinforcing thread S on the other side of the reinforcing layer. be.

<Problems to be Solved by the Invention> However, in the conventional bonding method described in the publication, each reinforcing thread S is brought into sliding contact with the outer surface of the annular tube 4, and the adhesive F flowing out onto the outer surface of the annular tube 4 is applied to each reinforcing thread. Since the coating is applied to the thread S, there are the following problems.

■Since each reinforcing thread S is in sliding contact with the outer surface of the annular tube 4,
There is a risk that the hose may be damaged and the performance of the hose may be reduced.

(2) The outflowing adhesive F adheres to the outer surface of the annular tube 4 in a bump-like manner. So-called "gum-up" is likely to occur, and in such a case, sliding resistance is applied to the reinforcing threads S, the tension of each reinforcing thread S varies, and the performance of the hose is degraded.

■The adhesive F flowing out onto the outer surface of the annular tube 4 is not entirely applied to each reinforcing thread S, and may remain in the non-sliding contact area with the reinforcing thread S on the outer surface of the annular tube 4. The yield of adhesive F is not good ■ When using the blade machine 1 in a so-called horizontal type, in which the carrier 2 is rotated on a vertical plane and the tube body A is conveyed horizontally, the axial direction of the annular tube 4 is Although it is necessary to arrange the adhesive in a horizontal direction, it is difficult to make the adhesive F flow out evenly from the entire outer surface of the annular tube 4 due to the influence of gravity. This is applicable only to the so-called vertical type where A is conveyed in the vertical direction, and the normal so-called horizontal type reinforcement where the inner tube extrusion process, outer tube extrusion process, cutting process, vulcanization process, etc. are performed in separate horizontal locations. It cannot be immediately applied to hose production lines.

This invention solves the above-mentioned problems, and allows adhesive to be applied without any trouble and with a high yield in the process of forming a reinforcing layer made of a large number of reinforcing threads in a reinforced hose. It is an object of the present invention to provide an adhesive application method that can be easily applied to a manufacturing line.

Means for Solving the Problems> The adhesive application method according to the present invention transports a tube body in a direction perpendicular to the rotating surface of the carriers at the center position of a large number of rotating carriers in a reinforcing layer forming device. , a method of applying an adhesive to the reinforcing threads during a reinforcing layer forming process of a reinforcing hose, in which a large number of reinforcing threads paid out from bobbins held in each carrier are driven into the outer periphery of the tube body to form a reinforcing layer, the method comprising: A nozzle through which the adhesive is discharged is disposed in at least one location above and away from the many reinforcing yarns between the thread unwinding position of the bobbin and the thread driving position into the tube body, and the adhesive is discharged from the nozzle. A predetermined amount of adhesive is allowed to flow out and fall, and the adhesive is applied in an umbrella-like manner to cover the outer surface of the approximately conical portion formed by numerous reinforcing threads from the lower position of the nozzle to the position where the thread is driven into the tube body. By doing so, the above-mentioned problem is solved.

<Operations and Effects of the Invention> In the adhesive bonding method according to the present invention, when a predetermined amount of adhesive is allowed to flow out and fall from a nozzle placed at a predetermined position, the lower position of the nozzle is moved by transport of the tube and rotation of the carrier. The adhesive is applied so as to cover the outer surface of the substantially conical portion formed by the many reinforcing yarns from the reinforcing yarn to the position where the yarn is driven into the tubular body in an umbrella shape without any gaps. A large number of reinforcing threads coated with adhesive in an umbrella shape are then driven into the tube body to form a reinforcing layer.

Therefore, in the bonding method according to the present invention, adhesive can be applied to each reinforcing yarn between the thread unwinding position of the bobbin and the thread driving position into the tubular body without bringing the nozzle or the like into contact with it. Unlike conventional methods, this method does not damage the reinforcing threads or change the tension of the reinforcing threads.

Furthermore, by adjusting the amount of adhesive that flows out and falls from the nozzle by considering the viscosity of the adhesive, it is possible to apply the adhesive only to the outer surface of the approximately conical part formed by a large number of reinforcing threads. Since all the adhesive that flows out and falls from the nozzle can be applied to the reinforcing thread, the yield is good.

Furthermore, in the bonding method according to the present invention, the adhesive is applied to each reinforcing thread by flowing out from a nozzle arranged at at least one place and falling, and using a conventional annular tube, it is applied evenly from the entire circumference of the annular tube. Since there is no need to drain the adhesive, it can be easily applied to reinforcing layer forming apparatuses that transport tubes not only vertically but also horizontally.

Therefore, the adhesive application method according to the present invention can apply the adhesive without any trouble and with a high yield in the process of forming a reinforcing layer made of a large number of reinforcing threads in a reinforced hose, and can also apply the adhesive to a horizontal reinforced hose. It can also be easily applied to production lines.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the reinforcing layer forming apparatus used in the examples is a blade machine 11 similar to the conventional one, but a large number of carriers 12 rotate on a vertical plane, and their central position rotates in the horizontal direction. The tubular body A is conveyed. Then, a large number of reinforcing yarns S drawn out from a bobbin 13 held by each carrier 12 are driven into the outer periphery of the tubular body A to form a reinforcing layer B.

Incidentally, an extruder for extruding the tube A is placed on the front side of the blade machine 11 in the conveying direction of the tube A, and an extruder for extruding the tube A is placed on the rear side of the blade machine 11 in the conveying direction of the tube A. An outer tube extruder is arranged to coat the outer tube. moreover,
Behind the outer tube extruder, there is a cutting machine that cuts the unvulcanized reinforcing hose to a predetermined length, which consists of three layers: an inner tube, a reinforcing layer B, and an outer tube, with tube body A as the inner tube, and a vulcanizer. A vulcanization tank and the like for carrying out the process are arranged. That is, the blade machine 11 is a so-called horizontal reinforced hose manufacturing line in which each process, such as an inner tube extrusion process, an outer tube extrusion process, a cutting process, and a vulcanization process, which are performed by each of the above-mentioned devices, is performed at separate locations in the horizontal direction. It is incorporated into and used.

The adhesive applicator 14 installed in the blade machine 11 includes a tank 15 storing adhesive F and two nozzles 16 connected to the tank 15. tank 1
5 is connected to a pressurizing pipe 17 for pressurizing the inside of the tank 15 and causing the adhesive F to flow out from the nozzle 16.

The nozzles 16, 16 are connected to the bobbin 1 in a large number of reinforcing yarns S.
3. Thread feeding position 1f from thread unwinding position X to tube body A
The reinforcing threads S are disposed above Y and near both edges of a substantially conical shape formed by a large number of reinforcing threads S, respectively.

When applying the adhesive F to the reinforcing thread S using this applicator 14, the inside of the tank 15 is pressurized via the pressurizing pipe 17 while the blade machine 11 is in operation or at the same time as the start of the blade machine 11. A predetermined amount of adhesive F is continuously flowed out and dropped from 16.

When the adhesive F flows out and falls without interruption, a large number of reinforcing threads S are formed from the lower position Z of the nozzles 16 and 16 to the thread driving position Y due to the conveyance of the tube body A and the rotation of each carrier 12. The adhesive F is applied to the outer surface of the substantially conical portion so as to cover it in an umbrella shape without any gaps;
A large number of reinforcing threads S applied in an umbrella shape are driven into the tube body A in this state. Therefore, the same effects as those described in the section of the functions and effects of the invention described above will be explained.

Furthermore, in the case of the embodiment, after the reinforcing layer B is formed, the outer tube is covered with the outer periphery of the reinforcing layer B. Not only the adhesive force of the reinforcing yarn S to the outer tube and the adhesive force between the reinforcing yarns S, but also the adhesive force of the reinforcing yarn S to the outer tube are improved.

In the case of the embodiment, the nozzle 16 causes the adhesive F to flow out and fall near both edges where a large number of reinforcing threads S are densely packed when viewed from above.
・16 were placed. The reason for this is that when the nozzle 16 is placed directly above the tube A where the gap between the many reinforcing threads S is large, the viscosity of the adhesive F is low at the beginning of the flow of the adhesive F and the amount of flow is large. Then, it is conceivable that the adhesive F directly falls and adheres to the tubular body A, causing the outer diameter of the tubular body A to partially increase. However, this is because such a problem is less likely to occur if it is placed at a location as in the embodiment. Therefore, instead of providing the nozzle 16 on both edges as in the embodiment, one nozzle 16 may be provided on only one edge, or the reinforcing thread S
One or more tubes may be provided above the tube body A near the thread driving position Y where the gap becomes narrower.Furthermore, if the viscosity of the adhesive F is high and the amount of outflow of the adhesive F is small, a large number of The nozzle 16 may be placed at any position above the substantially conical portion formed by the reinforcing yarn S. In addition, in the embodiment, the case where the blade machine 11 is used as the reinforcing layer forming device is explained. Of course, the same application can be made to a spiral machine.

Furthermore, in the examples, the case where the hose is used in the manufacturing process of a reinforced hose in which the extrusion process and the reinforcing layer forming process are performed at separate locations is explained, but each process as described in Japanese Patent Publication No. 59-39300 etc. The present invention can also be applied to a manufacturing process in which the following steps are performed substantially simultaneously.

Furthermore, in the present invention, the adhesive strength can be further improved by using threads already impregnated with an adhesive as reinforcing threads. Incidentally, in the conventional bonding method described in the publication, it was not possible to use reinforcing threads impregnated with an adhesive because such reinforcing threads tend to cause the aforementioned gum-up.

Furthermore, in the embodiment, the inside of the tank 15 is pressurized so that the nozzle 1
Although the adhesive F is shown to flow out from the nozzle 6, a pump may be used to discharge the adhesive F from the nozzle 16.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a blade machine illustrating an embodiment of the present invention, Fig. 2 is a schematic plan view of a blade machine illustrating the embodiment, and Fig. 3 is a schematic front view of a blade machine illustrating the embodiment. 4 is a front view of a conventional blade machine. 11--Blade machine, 12--Carrier, 13--Bobbin, 16--Nozzle, A... - Tube body, B...Reinforcement layer, D...Substantially conical portion, F...Adhesive, S...Reinforcement thread, X...Year unwinding position, Y...Year driving position. Patent application Toyoda Gosei Co., Ltd. No. 11m

Claims (1)

[Claims] At the central position of a large number of rotating carriers in a reinforcing layer forming device, a tube body is conveyed in a direction perpendicular to the rotating surface of the carrier, and a large number of tube bodies are fed out from a bobbin held by each of the carriers. A method of applying an adhesive to the reinforcing threads in a step of forming a reinforcing layer of a reinforcing hose in which reinforcing threads are driven into the outer periphery of the tube to form a reinforcing layer, the method comprising the steps of: A nozzle for discharging the adhesive is disposed at at least one location above and away from the plurality of reinforcing threads between the point where the thread is driven into the pipe body, and a predetermined amount of the adhesive is caused to flow out and fall from the nozzle. , characterized in that an adhesive is applied to the outer surface of the substantially conical portion formed by the plurality of reinforcing yarns from the lower position of the nozzle to the position where the yarn is driven into the tubular body so as to cover it in an umbrella shape. How to apply adhesive.