JPS6032623A - Manufacture of hose - Google Patents

Abstract

PURPOSE:To obtain a hose that is light in weight, flexible and high in adhesive peeling strength, by covering the outer surface of a cylindrical fabric directly with a multi-layer tube including an outer layer of a thermoplastic synthetic resin suitably selected for the use of the intended hose and an inner layer of a thermoplastic polyurethane resilient resin. CONSTITUTION:The outer surface of a cylindrical fabric 2 is covered by an extrusion method with a tube having at least two layers, that is, as an outer layer a synthetic resin layer 35a possessing characteristics required for the use of the intended hose and as an inner layer a thermoplastic polyurethane resilient resin layer 35b, and the inner surface of the cylindrical fabric is turned outside to obtain the intended hose (A). If wrinkles occur in the covering layer 3, pressurized steam is fed into the hose (A) to remove them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cloth hose lined with synthetic resin for use in fire hoses and the like.

In recent years, in order to expedite and smoothly extinguish fires, there has been a demand for lighter firefighting bows. Also, for hoses with the same type of structure other than fire hoses,
The aim is to reduce its weight. On the other hand, extremely strong and flexible synthetic resins have become available in recent years, and by using these synthetic resins as the lining of hoses, it is basically possible to reduce the weight of these hoses. Present-
3- In fact, various inconveniences have occurred in manufacturing technology, and this has not been realized.

Conventionally, when manufacturing hoses such as fire hoses in which the inner surface of a woven or knitted cylindrical fabric is lined with rubber or synthetic resin, the tube is molded from rubber or synthetic resin by extrusion molding, A widely used method has been to apply an adhesive to the outer surface of the tube or the inner surface of the cylindrical fabric, then draw the tube into the cylindrical fabric, and adhere the tube to the inner surface of the cylindrical fabric to form a lining.

This method requires a lot of work and costs 1 and is expensive, and when applying adhesive to tubes and cylindrical fabrics, it is necessary to rotate to make the amount of adhesive uniform. The disadvantage is that the adhesion is difficult to maintain. Furthermore, when the tube is drawn into the cylindrical fabric, a large force is applied to the tube, which tends to distort the tube, making it difficult to form a lining of uniform thickness.

Further, a cylindrical fabric is immersed in a rubber latex solution to form a coating of the latex rubber on the outer surface of the cylindrical fabric, and then the cylindrical fabric is turned over inside and outside to remove the rubber coating. It is also known how to obtain cloth hoses with or without lining. Although this method is an extremely excellent method for lining with rubber, it is not suitable as a method for lining with synthetic resin because latex with excellent physical properties cannot be obtained from synthetic resin.

Furthermore, there is also a method in which a synthetic resin coating layer is directly formed on the outer surface of a cylindrical fabric by extrusion molding, and then the inner and outer surfaces are turned over to form a cloth boce. However, this method does not provide sufficient adhesion between the coating layer and the tubular fabric.

In particular, fire hoses require extremely high quality for safety, and their performance (which is strictly regulated by the Ordinance of the Ministry of Home Affairs). Included in the required performance, 3.8cn+
Adhesive peel strength of 4.5K (] or more in width is required. Therefore, hoses with insufficient adhesion cannot be used as fire hoses.Furthermore, in general, fluid flows inside = 5 - Hoses require adhesive strength between each layer, and hoses with insufficient adhesive strength cannot withstand use as small hoses.

Furthermore, coating layers of rubber or tit synthetic resin are simultaneously formed on both the inner and outer surfaces of the coarse cylindrical fabric by extrusion molding, and the outer and inner coating layers are passed through the pores of the cylindrical fabric. Methods for improving the integration and adhesion peel strength are also known. However, in this method, coating layers are formed on the inner and outer surfaces of the cylindrical fabric, making the hose thicker and heavier, which is not preferable.

The present invention was made in view of the above circumstances, and it is an object of the present invention to stably manufacture a hose that has good productivity, is pumice, is flexible, and has high adhesion and peel strength between the cylindrical fabric and the coating layer. This provides a method that allows you to do this.

Accordingly, the present invention provides a method of forming a synthetic resin coating layer on the outer surface of a cylindrical fabric made by weaving or knitting m-strings, and then turning the inner and outer surfaces of the cylindrical fabric to form a boce. The synthetic resin coating layer has at least two layers, the outer layer being a thermoplastic synthetic resin having properties required according to the use of the hose, and the inner layer being a synthetic resin mainly composed of a thermoplastic polyurethane elastic resin. It is a duplication of layers, and the tube is formed by extrusion molding of at least two layers and is directly coated on the outer surface of the cylindrical fabric.

The present invention will be explained below with reference to the drawings. FIG. 1 shows the process of forming a synthetic resin coating layer on the outer surface of a cylindrical fabric by the method of the present invention. Reference numeral 1 denotes a cylindrical article obtained in this step 'C, and as shown in FIG. 2, a synthetic resin coating layer 3 is formed on the outer surface of a cylindrical fabric 2. By turning this cylindrical object 1 inside out and inside out, the shape shown in FIG. 3 is obtained.
In this way, the coating layer 3 is located on the inner surface of the cylindrical fabric 2, and the tC hose A is obtained by lining the cylindrical fabric 2 with the coating layer 3.

In FIG. 1, reference numeral 4 denotes an extrusion device, and an extrusion head 5 is installed in the center facing downward, and the extrusion head 5 has a two-layer extrusion m6a.

-7- 6b is installed. The extrusion head 5 has an outer shell 7
An outer layer resin passage 10a is formed between the outer shell 7 and the intermediate body 8, and an inner layer resin passage 10b is formed between the intermediate body 8 and the core body 9. and these resin passages 10a.

10b is joined at the tip of the intermediate body 8 to form an annular discharge port 11. In addition, in the center of the core body 9,
A cavity 12 is formed, and a suction member 13 is installed at the rear of the cavity 12. The inner diameter of the tip of the cavity 12 is
The outer diameter of the cylindrical fabric 2 is equal to or slightly larger.

14 is a mandrel tip. The mandrel tip 1
4 has a cylindrical shape whose outer diameter is equal to or slightly smaller than the inner diameter of the cylindrical fabric 2, and is provided at the front end of the cavity 12 of the extrusion head 5 with the inner surface of the cavity 12. They are positioned with a slight gap between them.

Further, a rod 15 is provided at the rear of the mandrel tip 14.
is attached, passes through the cavity 12 of the extrusion head 5, and extends rearward. A holder 16 having a generally bullet-shaped cross section is attached to the rear end of the rod 15, and small rollers 17 are rotatably supported on both shoulders of the holder 16, and are supported by support rollers 18. .

19 is a feeding device. The feeding device 19 consists of a pair of feeding rollers 218 and 21b having annular grooves 20a and 2011 formed in the center.
8 can be brought into contact with the other roller 211 by the cylinder 22. The rod 15 is fitted into the grooves 20a and 20b of the feed rollers 21a and 21b. The feed roller 21
a and 21b rotate in synchronization with each other and are actively driven.

23 is a preheating furnace, and the inside of the preheating furnace 23 is heated by blowing hot air through a hot air blowing port 24.

The suction member 13 has a suction port 25 connected to a vacuum pump to reduce the pressure inside the cavity 12.

A water bath 26 is provided below the extrusion head 5, and a reversing roller 27 is rotatably supported within the water bath 26.

28 is a guide roller, and 29 is a take-up device, which consists of a pair of endless bells 1 to 31a, 31b, each of which is hooked to a pair of rollers 30a, 3ob.

Thus, 2 is a cylindrical fabric. The cylindrical fabric 2 is wound around a reel 32 in a flat folded state, and is pulled out from the reel 32 and fed from above the apparatus via a guide roller 33. The cylindrical fabric 2 is placed over the outside of the holder 16, passes between the small roller 17 and the support roller 18, moves downward, and then passes between the feeding rollers 218 and 2ib of the feeding device 19. sandwiched,
By driving the feed rollers 21a and 21b, the cylindrical fabric 2 is fed downward.

The cylindrical cloth 2 first enters the preheating furnace 23 and is heated there by hot air. Subsequently, the tubular fabric 2 is introduced into the cavity 12 of the extrusion head 5. Further, the cylindrical fabric 2 passes through the cavity 12 of the extrusion head 5, covers the mandrel tip 14 at its lower end, is inflated to have a substantially circular cross section, and forms a gap between the mandrel tip 14 and the front end of the extrusion head 5. Proceed downward through the gap.

On the other hand, the thermoplastic synthetic resin 34 is produced from the extruders 6a and 6b.
-a, 34b are extruded. One extruder 6a extrudes a synthetic resin 34a having properties required according to the use of the Bose, and the other extruder 1I6b extrudes
A thermoplastic polyurethane elastic resin 34b is extruded.

Then, both synthetic resins 34a and 34b pass through the outer layer resin passage 10a and the inner layer resin passage 10b of the extrusion head 5, respectively, join at the tip of the intermediate body 8, unite, and proceed to the tip of the extrusion head 5. From the discharge port 11, the outer layer 35a of the synthetic resin 34a and the thermoplastic polyurethane elastic resin 34. A two-layer thermoplastic synthetic resin tube 35 is extruded, with the inner layer 35b and the inner layer 35b having a diameter of 11 -.

At this time, since the pressure inside the cavity 12 is reduced, the air inside the thermoplastic synthetic resin tube 35 is also sucked through the grains of the cylindrical fabric 2, and the pressure is reduced. Accordingly, the inside of the thermoplastic synthetic resin Chicove 35 is reduced in pressure, so that its diameter contracts. At this point, there is a thermoplastic synthetic resin tube 35.
Immediately after extrusion, the temperature is still high and plastic deformability is affected, so it is tightly adhered to the outer surface of the cylindrical fabric 2, and the coating layer 3 is formed on the outer surface of the cylindrical fabric. The cylindrical object 1 having the above-mentioned shape is molded.

The molded cylindrical object 1 passes through the flat molding device 15 and advances downward, is folded flat, and is placed in the water bath 2.
6, where it is thoroughly cooled. Then, it is advanced (1
The direction is reversed, and the film is taken up by the take-up device 29 and wound onto the take-up reel 36.

The thus obtained cylindrical article 1, which is formed by forming the synthetic resin coating m3 on the outer surface of the cylindrical fabric 2, is then turned over with its inner and outer surfaces in a known manner. As shown in Figure 3, a hose △ lined with synthetic resin is obtained. In addition, in the extrusion process, since the diameter of the synthetic resin tube 35 is slightly larger than that of the cylindrical fabric 2, wrinkles may be formed in the coating layer 3 in the length direction of the hose A in the state of the hose A. There is. Therefore, hose A
It is preferable to introduce pressurized steam of about 0.5 to 3.0 kqJ into the film to remove the wrinkles and improve the adhesive peel strength.

Next, a more specific example of the configuration of the present invention will be shown.

The cylindrical fabric 2 uses a cylindrical fabric. The tubular fabric is
The warp consists of two threads made of 8 strands of 20th spun polyester fiber twisted together for a total of 632 threads.
I use polyether for the weft! navy blue 1500
Dale length 1 [6 threads twisted together, 10 CI
The fabric was woven into a cylindrical shape with an inner diameter of 65 mm by placing 39 pieces between I1.

-13- In the present invention, as the synthetic resin 34a which becomes the outer layer 35a, a thermoplastic synthetic resin having characteristics required depending on the use of the hose is used. For example, in the case of manufacturing fire hoses, thermoplastic polyester elastic resin is suitable.

The thermoplastic polyester elastic resin is a synthetic resin obtained by block copolymerizing an aromatic polyester and a polyether, and among them, a flexible one is preferable, and for example, one manufactured by Toyobo Co., Ltd. under the trade name Pelprene P408. Commercially available products such as P40H are suitable. This thermoplastic polyester elastic resin can be easily extruded, has excellent anti-blocking properties, and is extremely easy to process. In addition, it is strong and extensible, and has excellent heat resistance, cold resistance, chemical resistance, mold resistance, and hydrolysis resistance.
It is extremely suitable as a synthetic resin for lining firefighting bows.

In addition, the inner layer 35. The synthetic resin 34b used for b is a thermoplastic polyurethane elastic resin. Previous time-i71 = The plastic polyurethane elastic resin is mainly composed of diisocyanate-1~, polyol, and glycol,
As the diisocyanate, 4,4'-siftonylmethane diisocyanate, /! , to 4”-dicyclohegycylmethane diisocyanate-1, to 1-lidene diisocyanate-1
, hexamethylene diisocyanate, etc., and polyols include poly-[ethylene adipate, poly1
．． Examples of the glycol include 4-butylene adipate 1-, polycaprolactone, and polyteramethylene glycol. Examples of the glycol include ethylene glycol, 1,4-butanediol, 1,6-hexanediol, and bishydroxyethoxybenzene. Among these, especially 4, 4
'-diphenylmethane diisocyanate-1 and bolide l-
A combination of ramethylene glycol and 1,4-butanediol is desirable because it has excellent mold resistance 1f1 and hydrolysis resistance.

This thermoplastic polyurethane elastic resin is preferably relatively flexible, and preferably has a hardness of about 65 to 80 degrees in Shore A hardness. Thermoplastic Bow 15 - The urethane elastic resin itself penetrates into the grain of the cylindrical fabric as an adhesive, so it has a large effect on the feel of the hose, and if a hard one is used, the hose will lose its flexibility and become hard. , which is not desirable.

Furthermore, the thermoplastic polyurethane elastic resin has a molar ratio of the entire -OH component of the polyol and glycol to the -NCO component of the diisocyanate (R value = -Nco
It is preferable to use an incompletely thermoplastic type thermoplastic polyurethane elastomer resin having a component/-OH component of 1°0 to 1.3. This incomplete thermoplastic type polyurethane has -NCOW at the end of the molecule, and when affected by heat, water, etc., the urethane bond and unreacted isocyanate (-NCO
group) reacts to form a ζ crosslink, which improves the adhesion and peel strength with the cylindrical fabric 2.

In addition, the thermoplastic polyurethane elastic resin 34b is
Melt viscosity is in the range of 3,000 to 2'0.000+)S,
Particularly preferably 5,000 to 10.0OOps and -1
6- It is best to extrude at a certain temperature, and the adhesion peeling strength with the cylindrical fabric 2 is comparable to white clay. When the melt viscosity is 3,0OOps or less,
The thermoplastic polyurethane elastic resin 34b enters the pores of the cylindrical fabric too much, making the hose stiffer and causing the hose to become stiffer than 20.0OOps.
- If it is -, it will be difficult to get into the fabric (and the adhesive strength will be insufficient).

In the present invention, the synthetic resin 34a used for the outer layer 35a of the coating layer 3 is not limited to the above-mentioned thermoplastic polyester elastic resin. As another example, thermoplastic polyurethane can also be used. In this case, unlike the thermoplastic polyurethane elastic resin for the inner layer 35b, it is preferable to use a completely thermoplastic type thermoplastic polyurethane elastic resin with an R value of about 0.95 to 1.05. Completely thermoplastic type thermoplastic polyurethane elastic resin has excellent anti-blocking properties and moldability, so it can be used outside! It is suitable as a synthetic resin for 135a.

In addition, thermoplastic vinyl chloride resin can also be used, but those containing a large amount of plasticizer such as DOP have poor adhesion to the thermoplastic polyurethane elastic resin of the inner m35b, and the interlayer between the inner and outer layers. This is not preferable as it may cause peeling. Therefore, when using polyvinyl chloride resin, it is preferable to use non-plastic thermoplastic vinyl chloride resin. Furthermore, it is also good to use a copolymer or blend of a thermoplastic vinyl chloride resin and a thermoplastic polyurethane elastic resin. In this case, the inner layer 3
Since both the outer layer 5b and the outer layer 35a contain thermoplastic polyurethane elastic resin, the above-mentioned interlayer peeling does not occur.

Furthermore, it is also possible to form an intermediate resin layer between the inner layer 35b and the outer layer 35a. Examples of the intermediate resin layer include a blend of a thermoplastic polyester elastic resin and a thermoplastic polyurethane elastic resin, and by forming this intermediate resin layer, the adhesive strength can be further improved.

In addition, the synthetic resin used for 1!135b is one whose main component is thermoplastic polyurethane elastic resin -18= in the present invention, but it is made only of thermoplastic polyurethane elastic resin 14. This is not necessary, and a small amount of thermoplastic polyester elastic resin may be blended, or a small amount of non-plastic thermoplastic vinyl chloride resin or the like may be blended.

In the hose manufactured according to the present invention, the cylindrical fabric 2 and the coating layer 3 are evenly and firmly bonded to each other. In the hose obtained by the method of the above-mentioned specific example, the cylindrical fabric 2
And covered 11H! The adhesive peel strength with 3 is 7 to 10 kg/3.8 cm in the length direction and 8 to 11 kg/3.8 cm in the circumferential direction, and a satisfactory adhesive peel strength can be obtained. Met. Furthermore, the present invention satisfies the above-mentioned performance requirements and allows selection of a low-cost, easily processable resin for the outer layer, and the hose shown in the above-mentioned specific example can be satisfactorily used as a fire hose. It was bearable.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view of the apparatus, showing the process of forming a coating layer on the outer surface of a cylindrical fabric according to the method of the present invention. FIG. 2 is a cross-sectional view of a cylindrical object formed by the process shown in FIG. 1, and FIG. 3 is a cross-sectional view of a bose formed by turning over the inner and outer surfaces of this cylindrical object. A... Hose 1... Cylindrical object 2...
...Tubular fabric 3...Coating layer 35...
・Tube 35a...Outer layer 35h...Inner layer -2〇-

Claims (1)

[Claims] 1. A method in which a synthetic resin coating layer is formed on the outer surface of a cylindrical fabric made by weaving or knitting fibers, and then the inner and outer surfaces of the cylindrical fabric are turned over to form a hose. The synthetic resin coating layer is at least two layers, the outer layer being a thermoplastic synthetic resin having properties required depending on the use of the hose, and the inner layer being a synthetic resin mainly composed of a thermoplastic polyurethane elastic resin. Hose manufacturing method 2, characterized in that the tube is molded by an extrusion molding method of at least two layers and directly coated on the outer surface of the cylindrical fabric. The thermoplastic polyurethane elastic resin is , Shore A
Method 3 for manufacturing a hose according to claim 1, characterized in that the hardness is 65 to 801. The thermoplastic polyurethane elastic resin has an R value of 1.
-NGO component/-Of- (component molar ratio) is -1-1.05 to 1.3, and an incompletely thermoplastic type is used. Method 4 for manufacturing a hose according to Item 2, wherein the thermoplastic polyurethane elastic resin contains polytetramethylene glycol and 1,4
- Manufacture of a hose according to claim 1, 2 or 3, which is a polyurethane resin containing as main components butanediol and 4,4'-Schiff J-nylmethane diisocyanate. Method 5 The thermoplastic polyurethane elastic resin has a melt viscosity of 3,000 to 20.0O.
Method 6 for manufacturing a hose according to claim 1, 2, 3, or 4, characterized in that extrusion molding is carried out in a range of Ops. Method 7 for manufacturing a boce according to claim 1, characterized in that the thermoplastic synthetic resin of the outer layer has an R value of 0.9.
5 to 1.05, fully thermoplastic type - 2 - Features characterized by being made of plastic polyurethane elastic resin
[Hose manufacturing method 8 according to claim 1, characterized in that the thermoplastic synthetic resin of the outer layer is a copolymer or blend of a thermoplastic vinyl chloride resin and a thermoplastic polyurethane resin. A method for manufacturing a hose according to claim 1