JPS6018535B2 - Method for manufacturing flexible airtight cylindrical body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for manufacturing a long flexible airtight cylindrical body, which is made by pasting a synthetic resin airtight tube on the inner surface of a cylindrical woven fabric made of fibers. It is about the method.

The flexible airtight cylindrical body obtained by the present invention can be used as is as a hose for passing fluids, or can be cut to a desired length and used as a flexible container for transporting powder or fluids. It is something that can be done. Furthermore, this flexible airtight cylindrical body is adhered to the inner surface of underground pipes such as gas pipes, water pipes, power lines, communication lines, and other pipes buried underground using adhesive. It can also be used to repair damage. This type of flexible airtight cylindrical body often uses a film of nylon 16 or nylon 166, which has excellent gas impermeability, in order to prevent leakage of fluid, especially gas. However, adhering these nylon films to woven fabrics is easier said than done, but in reality it is extremely difficult. The most common method is to use an adhesive for bonding, but if the dendritic fabric has a rough texture, the adhesive will leak out between the grains and not enough adhesive will remain. Moreover, since the adhesive permeates into the woven fabric, the obtained flexible airtight knot-shaped body becomes rigid and lacks flexibility. Therefore, in the present invention, a two-layered synthetic resin tube is used in which an outer layer of copolymerized nylon is formed on the outer surface of a nylon-6 tube.

Copolymerized nylon has a lower melting point than nylon-6,
Moreover, it exhibits adhesive properties when melted. Therefore, this synthetic resin tube is inserted into a cylindrical woven fabric, and internal pressure is applied to it to inflate it into a cylindrical shape.By heating it, the copolymerized nylon is melted, and the synthetic resin tube is shaped into a cylindrical shape by the molten copolymerized nylon. It is twilled onto woven fabric. However, nylon-6 has a glass transition point higher than room temperature, about 50 qo. Therefore, nylon-6 has relatively rigidity at room temperature. Because the film is thin, it has some flexibility, and is not so rigid that it cannot be processed, but the synthetic resin tube and the cylindrical woven fabric fit tightly, and even when internal pressure is applied, the synthetic resin tube does not move. It is partially wrinkled or distorted.
If heated rapidly in this state, the synthetic resin tube and the cylindrical woven fabric may become glued (until they no longer fit), causing wrinkles or causing the distorted area to be locally stretched significantly. This may cause the synthetic resin tube to partially break or be damaged. In view of the above circumstances, the present invention provides a method for manufacturing a flexible airtight knot-like body without local distortion or distortion by bonding a two-layer tube in a fit state to the inner surface of a cylindrical woven fabric. The purpose is to

In addition, in order for the synthetic resin tube and the cylindrical woven fabric to be properly bonded, the outer diameter of the synthetic resin tube and the inner diameter of the cylindrical woven fabric must exactly match.

However, it is extremely difficult to weave a cylindrical woven fabric so that the inner diameter is constant, and irregularities of about 1% cannot be avoided. Therefore, if the diameters of both are set to be the same, the inner diameter of the tubular woven fabric will be 4.
Inevitably, there will be a section, and the synthetic resin tube will wrinkle at that section. In order to avoid this, the outer diameter of the synthetic resin tube must be made slightly smaller, which means that the synthetic resin tube will be stretched and bonded with distortion when it is bonded. Further, in order to apply that much strain, it is necessary to apply a considerable amount of pressure inside the synthetic resin tube. Another object of the present invention is to provide a method for manufacturing a flexible airtight cylindrical body without significant distortion by bonding a synthetic resin tube along the inner surface of a cylindrical woven fabric in a fitted state. be.

FIG. 1 shows a state in which the present invention is implemented, 1
is a cylindrical woven fabric made of fibers such as nylon-6,
It may be woven into a seamless cylindrical shape, or it may be made into a cylindrical shape by joining both ends of a normal wide woven fabric.

A synthetic resin tube 2 is inserted into the knotted woven fabric 1 as shown in FIG. This synthetic resin tube 2 consists of a base layer 3 of nylon-6 and an adhesive layer 4 of copolymerized nylon, and these two layers are laminated together. Copolymerized nylon is nylon-11 or nylon-12
It is suitable to use nylon-6 as the main component and copolymerize it with nylon-6. The knotted woven fabric 1 with the synthetic resin tube 2 inserted therethrough is placed on the support stand 5, and the synthetic resin tube 2 is inserted into the knotted woven fabric 1.
Pressurized gas such as compressed air is sealed inside and inflated into a cylindrical shape.

The pressure of the gas at this time varies depending on the structure of the cylindrical woven fabric 1 and the thickness and diameter of the synthetic resin tube 2, but the pressure is such that the synthetic resin tube 2 and the cylindrical woven fabric 1 are inflated into a cylindrical shape. is sufficient, there is no need to increase the pressure any higher. next,
The knotted woven fabric 1 through which the synthetic resin tube 2 is inserted is mounted on a support stand 5.
Move the top to the right in the figure, and from one end, the preheating chamber 6,
It sequentially passes through the heating bonding chamber 7 and the humidifying chamber 8.

The preheating chamber 6 is maintained in an atmosphere at a temperature higher than the glass transition point of nylon-6 and lower than the glass transition point of copolymerized nylon.

This temperature is usually about 90°C. Before entering the preheating chamber 6, both the cylindrical woven fabric 1 and the synthetic resin tube 2 have a certain degree of rigidity, and due to mutual frictional resistance, the synthetic resin tube 2 and the linear woven fabric have a certain degree of rigidity. It does not fit fabric 1 and is locally distorted.
The entire structure is inflated with pressure fluid. Here, when the cylindrical fabric 1 and the synthetic resin tube 2 enter the preheating chamber 6 and are heated, the synthetic resin tube 2
In this case, the inner layer 3 of nylon-6 becomes pliable because it exceeds the glass transition point, and the cylindrical woven fabric 1 also becomes pliable due to the heat, thereby eliminating local distortion. Therefore, both the vertical woven fabric 1 and the synthetic resin tube 2 are free from local strain and become pliable, resulting in a state in which the cylindrical woven fabric 1 and the synthetic resin tube 2 are perfectly fitted. However, since the temperature in the preheating chamber is lower than the melting point of the copolymerized nylon, the copolymerized nylon is not yet melted and does not adhere. Therefore, it does not interfere with the removal of local distortion. The cylindrical woven fabric 1 and the synthetic resin tube 2 are
After being heated and fitted in the preheating chamber 6, it enters the heat bonding chamber 7.

The inside of the heating bonding chamber 7 is maintained at a temperature lower than the melting point of nylon-6 and higher than the melting point of copolymerized nylon. This temperature is suitably about 160 to 170 oo. As a result, the copolymerized nylon of the adhesive layer 4 of the synthetic resin tube 2 is melted, and the synthetic resin tube 2 is firmly adhered to the cylindrical woven fabric 1 by this melted copolymerized nylon. At this time, the synthetic resin tube 2 and the cylindrical woven fabric 1 have their local distortions removed and are fitted together, so they are not locally damaged or wrinkled by heating and are properly bonded. It will be done. The airtight cylindrical body obtained by bonding the cylindrical woven fabric 1 and the synthetic resin tube 2 in the heating bonding chamber 7 has moisture removed by heat, is in an absolutely dry state, and has lost its flexibility. If you fold it too quickly, the film may partially turn white, or
Cracks may occur.

Therefore, it is preferable to pass an airtight cylindrical body through the humidifying chamber 8 as shown in FIG. In this humidifying chamber 8, water is poured into the airtight cylindrical body to keep it moist. This results in
The hermetic knots become pliable again and do not cause the white Q phenomenon or crack when folded. Next, the airtight cylindrical body is passed between a pair of nip rollers 9, 9 and folded into a fan flat. If an object that has been inflated into a cylindrical shape with pressurized gas is suddenly folded into a fan, the cylindrical object may wrinkle. Therefore, as shown in FIG. 1, the airtight cylindrical body is gradually fan-flattened by passing between the guide roller groups 10, 10, which are provided parallel to each other and with the interval gradually decreasing. It is preferable to deform the material into a shape and finally apply pressure using the nip loafs 9, 9. The airtight cylindrical body folded into a fan flat is wound into a coil shape or folded in a zigzag pattern as required.

In the embodiments described above, both ends of the cylindrical woven fabric and synthetic resin tube are sealed and swelled into a cylindrical shape over the entire length, but in the present invention, the child heat ratio and the heat bonding process are It is sufficient to do so in an open state, and it does not necessarily have to be inflated over the entire length. Therefore, it is also possible to provide a nip roller behind the preheating chamber 6 and maintain a state in which a pressurized air flow is sealed between the nip roller and the nip roller 9. According to this, the support stand 5 is unnecessary. Therefore, the device can be small. FIG. 3 shows another example of the cylindrical woven fabric and synthetic resin tube used in the present invention.

Reference numeral 1 denotes a cylindrical woven fabric, into which a synthetic resin tube 2 is inserted.

This synthetic resin tube 2 is made of a two-layer film 2' in which an adhesive layer 4 of copolymerized nylon is formed on the side surface of a base layer 3 made of nylon 6 having a width smaller than the inner peripheral length of the cylindrical woven fabric 1. is bent into a cylindrical shape with the base layer 3 on the inside, and both twills are joined to form a knot. As shown in FIG. 3, the two edges of the two-layer film 2' are joined together, and the outer periphery of the joined part is covered with a copolymerized nylon adhesive layer 12 on both sides of the nylon 6 base layer 11. The three-layer tape 14 formed with the three-layer tape 13 is polymerized, and the adhesive layer 4 on both twill portions of the two-layer film 2' and the adhesive layer 13 of the Mitaka tape 14 are fused and integrated. Thus, as described above, a cylindrical woven fabric 1 with a synthetic resin tube 2 inserted therein.
is placed on a support stand 5, and a synthetic resin tube 2 is filled with pressurized gas such as compressed air to inflate it into a cylindrical shape.
Next, the tubular woven fabric 1 through which the synthetic resin tube 2 has been inserted passes through a preheating chamber 6, a heat bonding chamber 7, and a humidifying chamber 8 in sequence.

When the cylindrical woven fabric 1 and the synthetic resin tube 2 enter the preheating chamber 6 and are heated, the base layer 3 of nylon-6 in the synthetic resin tube 2 exceeds the glass transition point and becomes pliable. The shaped woven fabric 1 also becomes flexible due to the heat, local distortions are removed, and the cylindrical binding fabric 1 and the synthetic resin tube 2 are brought into a state of perfect fit. However, since the temperature in the preheating chamber 6 is lower than the melting point of the copolymerized nylon, the copolymerized nylon is not yet melted and does not adhere. Next, the cylindrical woven fabric 1 and the synthetic resin tube 2 enter the heating bonding chamber 7, and the synthetic resin tube 2
The copolymerized nylon of the adhesive layer 4 is melted, and the synthetic resin tube 2 is firmly adhered to the cylindrical woven fabric 1 by this melted copolymerized nylon.

Furthermore, as mentioned above, the width of the two-layer film 2' is shorter than the inner peripheral length of the cylindrical woven fabric 1, so the outer diameter of the synthetic resin tube 2 is smaller than the inner diameter of the cylindrical woven fabric 1, and the difference is The synthetic resin tube 2 needs to be expanded by that amount. According to the invention,
Since the two-layer film 2' is bent into a cylindrical shape and its edges are joined by the three-layer tape 14, when it is heated, the heat fuses it to the adhesive layer 13 of the three-layer tape 14 and the adhesive layer 13 of the three-layer tape 14. The adhesion layer 4 of the two-layer film is melted, and the two-layer film 2'
The base layer 3 of the three-layer tape 14 and the base layer 11 of the three-layer tape 14 are shifted from each other,
As shown in FIG. 4, there is a gap between both edges of the two-layer film 2', which causes the synthetic resin tube 2 to expand. A cylindrical woven fabric 1 and a synthetic resin tube 2 are placed in a heating bonding chamber 7.
The airtight cylindrical body obtained by bonding is placed in the humidifying chamber 8,
Water is sprayed and humidified.

FIG. 5 shows another example of the spliced portion of the synthetic resin tube 2, in which a layered film 2' having a width that is approximately the same as the inner peripheral length of the knotted woven fabric is bent into a cylindrical shape. , both greens are slightly overlapped and a three-layer tape 14 is polymerized and fused on the outside.

In this example, the English polymerized nylon melts during heat bonding, causing the two-layer film 2' and the three-layer tape 14 to shift, and the sixth
As shown in the figure, both edges of the two-layer film 2' are brought into contact with each other, and there is no large gap between them. According to the present invention, a preheating step is performed before heat-bonding the cylindrical woven fabric and the synthetic resin tube, so that partial distortion of the cylindrical woven fabric and the synthetic resin tube is removed, and both fit together. However, since it is heated and bonded in that state, the bound flexible airtight cylindrical body is not wrinkled, distorted, or damaged.

In addition, the cylindrical woven fabric made of nylon is heat set after weaving, and its dimensions are set to a predetermined size.
Afterwards, during storage or other processes, nylon absorbs moisture from the air, expands and contracts, and often loses its dimensions. However, in the present invention, the tubular woven fabric is dried in the preheating process and the moisture content becomes constant, so the dimensions of the tubular woven fabric return to the state at the time of heat setting, and the dimensional stability of the product is greatly improved. It also has this effect. According to the second method of the present invention, the synthetic resin tube is made by bending the two-layer film into a cylindrical shape and joining the two layers together with a three-layer tape, so that the two layers are bonded together by heat bonding. The film and three-layer tape are misaligned,
Since the synthetic resin tube can be expanded to match the tubular woven fabric, even if the diameter of the tubular woven fabric varies slightly, the synthetic resin tube can follow it, and the resulting maneuverability In the airtight cylindrical body, an extremely excellent product can be obtained without wrinkles in the synthetic resin tube or in the case where the synthetic resin tube is stuck in a stretched state.

Furthermore, according to the present invention, after bonding the synthetic resin tube and the knotted woven fabric, the resulting airtight cylindrical body is humidified, so that the product does not become excessively hard due to drying, and also when folded, etc. Synthetic resin tubes do not whiten or crack.

Furthermore, when folding the product, the guide rollers gradually deform it into a fan-flat shape and then fold it with the nip rollers, so there is no chance of the product getting twisted or damaged. The strippable airtight cylindrical body produced according to the present invention can be used as is as a hose for fluid transfer, or can be cut to a desired length and used as a flexible container. It is.

Furthermore, it is suitable as a lining material to be attached to the inner surface of underground pipes such as gas pipes for repairing underground pipes. Furthermore, when attaching a lining material to a pipe, there is a known method of inserting the lining material into the pipe while turning it inside out using fluid pressure and simultaneously attaching it. The flexible airtight cylindrical body is turned over once before use.

[Brief explanation of the drawing]

FIG. 1 is a front view showing how the method of the present invention is carried out, and FIG. 2 is a cross-sectional view showing an example of a cylindrical woven fabric and a synthetic resin tube. FIG. 3 is a cross-sectional view showing another example of a cylindrical woven fabric and a synthetic resin tube, and FIG. 4 is a cross-sectional view showing a state in which they are bonded together by heating. FIG. 5 is a cross-sectional view showing still another example of a cylindrical woven fabric and a synthetic resin tube, and FIG. 6 is a cross-sectional view showing a state in which they are bonded together by heating. DESCRIPTION OF SYMBOLS 1...Tubular woven fabric, 2...Synthetic resin tube, 2'...Two-layer film, 3...Base layer of synthetic resin tube, 4...
... Adhesive layer of synthetic resin tube, 6 ... Preheating chamber, 7 ... Heat bonding chamber, 8 ... Humidification chamber, 11.
...Base layer of three-layer tape, 12, 13...
Adhesive layer of three-layer tape, 14...Three-layer tape. 4 figures, many Z figures, many figures;

Claims (1)

[Scope of Claims] 1 A cylindrical woven fabric 1 made of nylon, which has an outer diameter approximately equal to the inner diameter of the woven fabric, and a base layer 3 of nylon, which has a lower melting point than the nylon and which adheres when melted. A state in which a synthetic resin tube 2 made of a copolymerized nylon adhesive layer 4 having a property is inserted, and pressurized gas is sealed in the synthetic resin tube to inflate the synthetic resin tube and the cylindrical woven fabric into a cylindrical shape. a preheating step of heating from one end to the other end to a temperature higher than the glass transition point of the nylon and lower than the melting point of the copolymerized nylon, and lower than the melting point of the nylon and lower than the melting point of the copolymerized nylon. The process of bonding the synthetic resin tube to the cylindrical woven fabric by heating to a high temperature is performed in sequence, the synthetic resin tube and the cylindrical woven fabric are bonded over the entire length to obtain an airtight cylindrical body, and then the airtight cylindrical body is obtained. The cylindrical body is humidified, and then the airtight cylindrical body is deformed into a flat shape through a group of guide rollers 10 provided so that the interval between them becomes gradually smaller, and the airtight cylindrical body is compressed by nip rollers 9 and folded flat. A method for manufacturing a flexible airtight cylindrical body. 2 The width is approximately equal to or slightly smaller than the circumference of the flexible airtight cylindrical body to be manufactured, and the melting point is lower than that of the nylon base layer 3 and the nylon formed on one side of the base layer. A two-layer film 2' consisting of an adhesive layer 4 of copolymerized nylon that has low adhesiveness when melted is curved into a cylindrical shape so that the base layer is on the inside, and both edges of the film are brought into contact with each other. A three-layer tape 14 having adhesive layers 12 and 13 of the copolymerized nylon formed on both sides of the nylon base layer 11 is polymerized on the outside of the nylon base layer 11, and the adhesive layers 4 and 13 of the two-layer film and the three-layer tape are formed in the polymerized portion. are fused to form a synthetic resin tube 2, the synthetic resin tube is inserted into the cylindrical woven fabric 1, and pressurized gas is sealed in the synthetic resin tube to form a synthetic resin tube and the cylindrical woven fabric. inflating the cloth into a cylindrical shape, preheating the synthetic resin tube and the cylindrical woven cloth sequentially from one end to the other to a temperature higher than the glass transition point of the nylon and lower than the melting point of the copolymerized nylon; Next, the synthetic resin tube is heated to a temperature lower than the melting point of the nylon and higher than the melting point of the copolymerized nylon to adhere the synthetic resin tube to the cylindrical woven fabric to obtain an airtight cylindrical body, and then the airtight cylindrical body is humidified. A flexible airtight cylindrical body characterized by passing the airtight cylindrical body through a group of guide rollers 10 provided so that the interval between the bodies becomes gradually smaller, deforming the body into a flat shape, and folding the body into a flat shape by pinching with nip rollers 9. How the body is manufactured. 3. The method for manufacturing a flexible airtight cylindrical body according to claim 2, which comprises abutting both edges of the two-layer film when it is bent. 4. The method for manufacturing a flexible airtight cylindrical body according to claim 2, characterized in that when the two-layer film is bent, both edges thereof are slightly overlapped.