TW202017671A - Pipe having a coating on an inner surface and method of making the pipe - Google Patents

Abstract

There is provided a method for making a pipe having a coating on an inner surface of the pipe and the pipe having the coating. The method may comprise coating a lining material on a surface of a flat plate; bending opposing edge portions of the coated flat plate to form pair of elongate catches; bending the coated flat plate and engaging the pair of elongate catches to form a pipe; heating a location of the engaged pair of elongate catches; and pressing an outer surface of the pipe and an opposing inner surface of the pipe at the heated location of the engaged pair of elongate catches.

Description

Pipe fitting with coating on inner surface and manufacturing method thereof

The invention relates to a pipe fitting with a coating on the inner surface and a method for manufacturing the pipe fitting.

The inner surface of various types of conventional pipe fittings (such as water pipes, gas pipe fittings, heat transfer pipes, etc.) used in the industry must be resistant to corrosion and chemical reactions between the pipe fittings and the fluid flowing therein. This can be achieved by coating the inner surface of the pipes with a resin layer such as a fluororesin layer.

Coated or lined fluororesins are often used especially in chemical, pharmaceutical and semiconductor plants that may be exposed to highly corrosive chemicals.

The fluororesin material may be in the form of powdered powder, whereby it contains the resin itself or as a compound mixed with additives such as coloring agents, acid scavengers or fillers. The method of applying the fluororesin material to the inner surface of the pipe can be performed by applying an electrostatic powder coating to the inner surface of the pipe using an electrostatic powder spray gun, and then heating the pipe to melt the powder to form a coating. However, this method can only produce tubes with only one layer of film at a time. If several layers of film are required, several separate coatings are required to achieve the target film thickness. This slows down the pipe manufacturing time. In addition, back ionization is a problem in this method. The excessive accumulation of charge prevents the electrostatic powder from further depositing on the surface of the pipe with the existing coating.

Another method is a rotary lining (Roto-lining) method, which involves the introduction of particulate fluororesin material and heating pipe on the inner surface of the substrate, so that the particulate fluororesin material is melted and allows a well-controlled rotation and heating process Flow evenly. Since the flow depends not only on the rotation of the substrate, but also on factors such as heating uniformity and the interaction between the fluororesin material and the substrate, it is inherently difficult to control the exact flow of the molten particulate fluororesin material. Generally speaking, the rotary lining method is suitable for linings or coatings with a thickness greater than 1 mm, but not for thinner linings or coatings with a thickness of less than 1 mm.

In the two aforementioned methods, it is difficult to obtain a thin coating with a uniform thickness without lining defects, because it is difficult to control the spray of the electrostatic powder spray gun and the flow of the molten particulate fluororesin material.

In response to the aforementioned problems/difficulties, various technological developments have been made. For example, it has been used to coat a metal flat plate with a fluororesin powder before bending and welding to obtain a tubular pipe with an inner surface coating. However, there are negative effects caused by the use of welding technology. Components subjected to welding experience temperatures higher than the thermal decomposition temperature of the fluororesin lining material. The affected parts where the fluororesin lining material has been decomposed due to high temperature need to be modified. In addition, the decomposition of fluororesins leads to the release of harmful gases that pose a risk to the human body.

Another method as described in Japanese Patent Application No. JP1992-352689 involves lining the inner surface of the storage tank with a single piece of fluororesin film without any overlap of the fluororesin films. The end edges of the fluororesin film are adjacent to each other, so that the edges form a butt joint. The sealing film is then placed over the butt joint to cover it. A technique involving the application of heat and pressure on the sealing film (eg, heat sealing or welding) is used to seal the butt joint. However, this process requires additional heating and melting of the sealing film. These extra steps make it difficult to control the coating The thickness uniformity of the layer also reduces the efficiency of the process of coating the inner surface of the tank.

On the other hand, Japanese Patent No. 3954120 describes a method involving drawing a tubular liner hydrocarbon-based material into a metal tube and pressing the tubular liner onto the inner surface of the tube by compressed air supplied into the liner material. This method can be applied to hydrocarbon resins such as polyethylene and polypropylene, but is not applicable to other resins with higher yield point strength (such as fluororesins). Unlike hydrocarbon resins, fluororesins require higher pressures before they plastically deform. Therefore, if this method is applied to coating fluororesins, significant pressure will be required in the process, which will affect the efficiency of the process or cause safety risks.

According to one aspect of an example of the present disclosure, a method of manufacturing a pipe with a coating on an inner surface of the pipe is provided. The method may include: (i) coating the lining material on one surface of the flat plate; (ii) bending opposite edge portions of the coated flat plate to form a pair of elongated detents; (iii) bending the coated flat plate And combining the pair of elongated detents to form a pipe; (iv) heating a position of the pair of combined elongated detents; and (v) pressing the outside of the pipe at the heated position of the pair of combined elongated detents The surface and the relative inner surface of the pipe.

According to another aspect of an example of the present disclosure, there is provided a pipe member having at least two elongated detents that are combined with each other by the method to form the pipe member.

100‧‧‧Pipe fittings

102‧‧‧Press roller

103‧‧‧Press roller

104‧‧‧lining material

106‧‧‧Relative edge part of tablet 110

107‧‧‧adjacent part of tablet 110

108‧‧‧Slender detent

109‧‧‧ along the longitudinal axis of the length of the tube 100

110‧‧‧ Tablet

111‧‧‧Rotation axis of pressure roller

120‧‧‧small gap or opening

800‧‧‧Support equipment

802‧‧‧Support shaft

804‧‧‧Extendable shaft

805‧‧‧Roller support

806‧‧‧Roller support

807‧‧‧roll

F _A ‧‧‧Plane surface

F _B ‧‧‧Plane surface

W‧‧‧Width of slender detent 108

α‧‧‧Bevel

Those skilled in the art can make a better understanding and easily understand the specific examples of the present invention through the following written descriptions, only through examples and combined drawings, in which: FIG. 1 is a flat plate 110 and a surface for coating on the flat plate 110 Lining material 104 is a perspective view; FIG. 2 is a perspective view of the flat plate 110 (transparent), wherein its opposite edge portion 106 is bent in the opposite direction; FIG. 3 is a front view of the tube 100 that has been formed by the flat plate of FIG. 2.

FIG. 4 is a front view of the tube member 100 illustrating how a pair of elongated detents 108 are combined with each other.

FIG. 5 is a front view of the tube member 100 illustrating that the pair of elongated detents 108 are combined with each other.

FIG. 6 is a front view of the tube member 100 illustrating the use of the pressing rollers 102 and 103 at a position of the pair of elongated detents 108.

7 is a perspective view of the tube member 100 illustrating the position of the pair of elongated detents 108 on the tube member 100 and the movement of the pressing roller along the position of the pair of elongated detents 108. FIG.

FIG. 8 is a perspective view of the formed pipe fitting, which illustrates an example of how the position of the pressing roller can be fixed to the pipe fitting.

These figures are not drawn to scale and are only intended for illustrative purposes.

Referring to FIGS. 1, 2 and 3, the present disclosure relates to a method of manufacturing a tube 100 having a coating on the inner surface of the tube 100. This method includes: (i) coating the lining material 104 on the surface of the flat plate 110; (ii) bending the opposite edge portion 106 of the coated flat plate 110 to form a pair of elongated detents 108; (iii) bending the warp Coating the plate 110 and combining the pair of elongated detents 108 to form the tube 100; (iv) heating a position of the pair of combined elongated detents 108; and (v) the warp at the pair of combined elongated detents 108 Pressure fitting 100 at the heating position And the inner surface of the tube 100.

The tube 100 has a coating on the inner surface of the tube 100 and at least two elongated detents 108 that are combined with each other to form the tube 100. At least two elongated detents 108 of the pipe member 100 are adhered together by the coating after applying heat and pressure.

FIG. 1 illustrates an example of the tablet 110. The flat plate 110 includes two flat surfaces F _A and F _B. The two planar surfaces F _A and F _B are the main outer surfaces of the flat plate 110 on opposite sides of each other. The tablet 110 may have various width, length, and thickness dimensions to suit its intended use. In the example of FIG. 1, the shape of the flat plate 110 is substantially rectangular. The word "flat" in this text means that the plate 110 may be precisely flat or may appear flat during random visual inspection, but it may be shown to be slightly uneven by using the instrument, ie it may slightly fluctuate or Can be slightly bent.

The flat plate 110 may have various shapes, and those skilled in the art should understand that the flat plate 110 is only used to describe an example of a method for coating the inner surface of the tube 100, and a structure suitable for manufacturing the tube 100 and a frame assembly may also be used. Other possible forms.

In this example, the flat plate 110 is made of metal (for example, steel, aluminum, or copper). However, it should be understood that depending on the fluid or object that is intended to be transported through the tube 100, the plate 110 may be made of a combination of different materials. The different material combinations may include metal alloys, metal composite alloys, or any material combination in which at least one component is a metal, such that the material combination results in a material that is ductile and bendable. In addition, the tablet 110 may also be made of other types of composite materials including plastic.

The lining material 104 to be adhered to the flat plate 110 as shown in FIG. 1 may include an adhesive surface adhered to any surface of the flat plate 110 suitable for implementing the tube 100. Clear words, in the present example, the surface to be adhered to the outer surface of the main line F _A plate 104 of the lining material 110 and the outer surface of the main F _A then becomes the inner surface of the tube member 100. The lining material 104 may be made of an adhesive material that can be adhered to the surface of the flat plate 110. In the case where the lining material 104 is made of a viscous material, it is possible that when the lining material 104 is heated to a certain temperature, the adhesive property of the lining material 104 adhered to the surface of the flat plate 110 is activated. Those skilled in the art should understand that the method of applying the lining material 104 on the surface of the flat plate 110 is not limited to the above method, but will include any reasonable method generally known and used in the coating industry of the tube 100.

In this example, the liner material 104 is a fluororesin film. Examples of fluoropolymers that can be used to form fluororesin films include ethylene tetrafluoroethylene (ETFE) and perfluoroalkoxy alkane (PFA). Fluoro copolymers as described in patent publication US7112640B2 are also examples of suitable polymers that can be used to form fluororesin films. In other configurations, the liner material 104 may include more than one fluororesin film. The fluororesin film layer directly in contact with the surface of the tablet 110 may be configured to have adhesive properties for attachment to the surface of the tablet 110. The viscous material containing a carboxyl functional group is an example of a material having adhesive properties suitable for a fluororesin film. The purpose of coating one surface of the flat plate 110 (that is, the inner surface of the tube 100) is, for example, to help improve the flow of fluid or reduce the corrosion of the tube 100. Therefore, any liner material 104 suitable for the purpose can be used.

Depending on the application of the pipe fitting 100 to be implemented, the thickness of the lining material 104 in the pipe fitting 100 may be between 100 μm and 500 μm. The liner material 104 may include more than one layer of overlapping material. Therefore, the thickness of the lining material 104 in the tube 100 can be set according to the degree of overlapping materials to be implemented. The lining material 104 in the thickness range between 100 μm and 500 μm is suitable for metal pipe fittings 100 used in the industry to transport metal corrosive fluids. Unlike the conventional rotary lining method, the thickness of the lining material 104 is not limited to 1 mm or more.

After the lining material 104 is coated on the surface of the flat plate 110, the edge portion 106 of the flat plate 110 and the opposite edge portion 106 of the flat plate 110 (hereinafter collectively referred to as "opposite edge portion 106") will be bent as illustrated in FIG. FIG. 2 is deliberately drawn to be transparent, so that the curved opposite edge portion 106 can be clearly seen. FIG. 2 is also deliberately drawn so that the opposite edge portion 106 is not to scale and is larger than its actual size in actual implementation. The “edge portion 106 ”of the tablet 110 refers to the area of the tablet 110 located on or along the periphery or edge of the tablet 110. Each opposing edge portion 106 is bent to form an inclination angle α with respect to the adjacent portion 107 of the flat plate 110. Each opposing edge portion 106 may be appropriately bent at a similar angle or at different angles to achieve the purpose of forming the pair of elongated detents 108 that can be attached or combined with each other when the pair of elongated detents 108 are close together. In this example, the opposite edge portions 106 are each bent to the same angle with respect to the portion of the flat plate 110 adjacent to the respective edge portion 106 but in opposite directions. Clear words, wherein a portion of the opposing edges of the planar surface 106 with respect to the main plate 110 F _A is bent at an angle to the first direction, and the other opposing edge portions 106 of plate 110 relative to the other major planar surface but F _B Bend at the same angle in the second direction opposite to the first direction. The opposite edge portions 106 of the flat plate 110 can each be bent in their respective relative directions at an angle α between 135° and 170° with respect to the respective main planar surfaces F _A and F _B of the flat plate 110 before bending .

In this example, the shapes of the opposing edge portions 106 are each substantially rectangular. The opposite edge portion 106 may be curved so that it has a similar width W or a different width W suitable for forming the pair of elongated detents 108. Each opposing edge portion 106 may be curved to have a width between 10 mm and 20 mm. In this example, the length of the opposing edge portion 106 will form the length of the tube 100. In this example, the opposing edge portions 106 will eventually form the pair of elongated detents 108. Therefore, the term "opposite edge "Part 106" and "elongated detent 108" are used interchangeably in this disclosure.

After bending the opposite edge portions 106 of the coated flat plate 110 to form the pair of elongated detents 108, the next step in the method for coating the inner surface of the tube 100 is to subsequently bend the flat plate 110 into the shape of the tube 100, The individual elements of the pair of elongated detents 108 will be next to each other as illustrated in FIG. 3. FIG. 3 shows a side view of the tube 100 in a configuration before the elongated detents 108 are combined with each other. The term "immediately" may refer to a position where the elongated detent 108 is located along and/or near the circumference of the pipe 100 shortly before the pipe 100 is completely formed by bending the flat plate 110. The elongated detents 108 can be brought close to each other so that they are separated from each other by a small gap or opening 120. Those skilled in the art should understand that the meaning of "immediately provided" is only for reference, because it should be understood that the pipe fitting 100 need not have a circular shape, and the shape of other pipe fittings 100 is also possible.

As shown in FIG. 3, the purpose of bending the flat plate 110 at the current step in the method until there is a small gap or opening 120 separating the elongated detent 108 is to provide sufficient space to adjust and align the pair of elongated detents The individual elements of the sub 108 to enable the pair of elongated detents 108 to be combined with each other to form the tube 100. The individual elements of the pair of elongated detents 108 basically refer to the opposing edge portions 106. FIG. 4 shows the further steps illustrated by FIG. 3 in bending the flat plate 110 to incorporate the elongated detent 108. The flat plate 110 is bent so that one of the pair of elongated detents 108 is positioned above the other of the pair of elongated detents 108 so that it can be combined and hooked. When the respective edge portions 106 overlap, the pair of elongated detents 108 are combined and hooked to each other. After being coupled and hooked, the pair of elongated detents 108 are pressed or flattened to make surface contact with each other, so that the tube 100 forms its intended catheter shape as shown in FIG. 5 for transporting fluids or objects therein , And will not separate so that the tube 100 will leak or cannot be used as a conduit for transporting fluids or objects therein.

It will be appreciated that the pair of elongated detents 108 may be made with lining material 104 coated thereon, or in another configuration, made without lining material 104 coated thereon. This can be accomplished by adjusting the size of the lining material 104 to cover or not cover the area where the elongated detent 108 will be formed when the lining material 104 is coated on the flat plate 110. In this example, the pair of elongated detents 108 has a lining material 104 coated thereon and the liner material 104 is sandwiched between the pair of elongated detents 108 when they contact each other. Having the lining material 104 sandwiched between the pair of elongated detents 108 advantageously helps the elongated detents form a stronger joint when heating is applied to soften the lining material 104. The softened lining material 104 sandwiched between the pair of elongated detents 108 helps to adhere the metal layers of the pair of elongated detents 108 together. In other words, the pair of elongated detents 108 are adhered by the coating or lining material 104 of the pipe.

In this example, as shown in FIG. 5, the shape of the tube 100 formed by combining the pair of elongated detents 108 is substantially tubular or cylindrical, and has a hollow suitable for conveying objects such as fluids in the tube 100 core. The cross-section of the tube 100 is ring-shaped, which is substantially circular. However, it is understood that other shapes of the tube 100 that can be manufactured by the method described herein or the like are also possible. For example, the tube 100 may have a substantially quadrangular or polygonal cross-section.

After bending the coated plate 110 and combining the pair of elongated detents 108 to form the tube 100, the next step is to apply the position of the pair of combined elongated detents 108 (which can also be regarded as the joint of the tube 100) Heating and pressure. In this example, the position of the pair of combined elongated detents 108 may also be referred to as the position of the respective edge portions 106 that overlap and are in surface contact with each other. The heat system is sufficiently applied to soften but not completely melt the liner material 104 on the pair of elongated pawls. Softening the lining material 104 facilitates adhesion to the metal surface of the elongated detent 108 and to the tube 100 that will be in contact with the surface of the edge portion 106 Of the adjacent part 107. Apply pressure in the opposite directions of the elongated detents 108, apply one force to the inner surface of the tube 100 at the position of the elongated detent 108 and apply another force to the tube at the position of the elongated detent 108 The inner surface of 100 is opposite to the outer surface of tube 100. Heat and pressure can be applied separately at the location of the pair of combined elongated detents 108 or at the same time. If heat and pressure are applied separately, they can be applied at short intervals from each other to sufficiently soften the lining material 104 to facilitate adhesion to the metal surface of the elongated detent 108 when the lining material 104 is still sufficiently soft.

In this example, the position of the pair of combined elongated detents 108 is simultaneously pressed and heated to combine the surfaces of the respective edge portions 106 bent to overlap each other. The heat applied to this location reduces the viscosity of the lining material 104 to facilitate adhesion to the surface of the overlapping respective edge portions 106 and to the adjacent portion 107 of the tube 100 that is in surface contact with the surface of the respective edge portions 106.

The heating at the location of the pair of combined elongated detents 108 should not completely melt the liner material 104 or the tube 100. Otherwise, there will be undesirable changes in the coating thickness of the lining material 104 at least around the heating position in the inner surface of the tube 100. Applying heat to the position of the pair of combined elongated detents 108 for a short period of time, for example, less than 1 minute (which is suitable for this example), helps prevent the liner material 104 from completely melting. In addition, in this example, the position of the pair of combined elongated detents 108 is heated to a temperature between 60°C lower than the melting point of the lining material 104 and 20°C higher than the melting point of the lining material 104. This softens the desired temperature range of the liner material 104. The heating temperature at the location of the pair of combined elongated detents 108 is much lower than the welding temperature of the metal used to manufacture conventional pipe fittings without the pair of elongated detents 108. Therefore, unlike some conventional techniques for joining and manufacturing pipe fittings that involve metal welding, this example has a lining material 104 will not be heated to the advantage of the metal welding temperature that will decompose the lining material 104.

Pressure can be applied to the position of the pair of combined elongated detents 108 as follows. In this example, as shown in FIGS. 6 and 7, two pressing rollers 102 and 103 are provided and are made to move in series to provide pressure at the position of the pair of combined elongated detents 108 of FIG. 5. The pressure rollers 102 and/or 103 can be heated so that heat and pressure can be applied simultaneously. In this example, the meaning that heat and pressure are applied almost simultaneously is that pressure is applied immediately after the lining material 104 softens and has adhesive properties. There are two pressing rollers 102 and 103 to provide a counter force, which is at the outer surface of the tube 100 at the heated position of the pair of combined elongated detents 108 and at the heated position of the pair of combined elongated detents 108 Fastening or clamping pressure is applied to the opposite inner surface of the tube 100. The pressing roller 103 presses against the inner surface of the tube 100 at the heated position of the pair of combined elongated detents 108, and the pressing roller 102 presses against the heated position of the pair of combined elongated detents 108 The inner surface of the tube 100 is opposite to the outer surface of the tube 100 at the heated position of the pair of combined elongated detents 108. The applied pressure not only facilitates the adhesion of the lining material 104 to the metal surface at the pair of combined elongated detents 108, the pressure also presses the metal at the combined elongated detents 108 to form a strong force Connector. It is understood that the number of pressing rollers may not necessarily be limited to two, but may be more than two.

In this example, the pressure roller 102 is arranged such that its rotation axis 111 is orthogonal to the longitudinal axis 109 along the length of the tube 100, as shown in FIG. In this example, the pressure roller 103 is also disposed in the tube 100 in the same manner, so that its rotation axis 111 is orthogonal to the longitudinal axis 109 along the length of the tube 100. For convenience, only one of the rotation axes of the pressing rollers 102 and 103 is shown, and the two rotation axes are given the same element symbol 111. Furthermore, in this example, the rotation axes of the pressing rollers 102 and 103 are parallel to each other. However, it is understood that the pressure rollers 102 and 103 may be provided in any manner as long as the pressure rollers 102 and 103 can sufficiently and effectively apply pressure and/or heat to the position of the pair of combined elongated detents 108. The purpose is to cause the pressure rollers 102 and 103 to roll over the curved opposite edge portions 106 (which are curved to form the pair of combined elongated detents 108).

Each of the pressure rollers 102 and 103 is substantially cylindrical. Each of the pressure rollers 102 and 103 can rotate around its rotation axis 111. In another configuration, it is possible that only the pressing roller 102 is rotatable and the pressing roller 103 is not rotating. In another configuration, it is also possible that only the pressing roller 103 is rotatable and the pressing roller 102 is not rotating. In a configuration, it is also possible that both pressure rollers 102 and 103 are replaced by a pair of non-rotating pair of pressure applying elements. In this case, it will press on the elongated detent 108 and slide along the opposite surface of the elongated detent 108 during the pressing and/or heating process. The pressure applying element may be made to have a smooth surface to reduce friction as it slides along the surface of the elongated detent 108.

The pressure roller 103 may be coated or manufactured with a non-sticky material to prevent the heated pressurized liner material 104 from adhering to the pressure roller 103. Examples of such non-stick materials include fluoropolymers such as polytetrafluoroethylene (PTFE) and the like. The application of heat to the position of the pair of combined elongated detents 108 can be accomplished by, for example, induction heating of the pressure rollers 102 and/or 103, and/or the tube 100.

The heating at the position of the pair of combined elongated detents 108 may be performed while the position of the pair of combined elongated detents 108 is pressed by heating the pressure rollers 103 and/or 102. Alternatively, in the case where the pipe member 100 is made of a thermally conductive material such as metal, the pipe member 100 may alternatively be heated so that the surface of the overlapped respective edge portions 106 coated with the liner material 104 and the respective Adjacent portions 107 of the tube member 100 in surface contact with the surface of the edge portion 106 adhere to each other. In another configuration, both the pressure roller 103 and/or 102 and the tube 100 can be heated. In yet another configuration, in this The outer surface of the pipe member 100 at the position of the combined elongated detent 108 and the opposite inner surface of the pipe member 100 may be pressed so that the surfaces of the overlapping respective edge portions 106 and the surfaces of the respective edge portions 106 Adjacent portions 107 of the tube member 100 in surface contact are adhered to each other, and then heated at the same position of the pair of combined elongated detents 108 to ensure adhesion at the position of the pair of combined elongated detents 108.

There are several methods for applying pressure to the outer surface of the tube 100 and the opposite inner surface of the tube 100 at the heated position of the pair of combined elongated detents 108. An example of applying pressure to the outer surface of the pipe member 100 and the opposite inner surface of the pipe member 100 at the heated position of the pair of combined elongated detents 108 is when the position of the pair of combined elongated detents 108 is pressed by a pressure roller When the pressure is applied by 102 and 103, the pressure rollers 102 and 103 are kept fixed and the tube 100 is continuously moved in the direction along the length of the tube 100. Alternatively, in another example, the pressure rollers 102 and 103 may be pressed on the inner surface of the tube 100 along the length of the elongated detent 108 and the opposite outer surface of the tube 100 along the length of the elongated detent and the tube 100 remains fixed At the same time, it continuously moves in the direction along the length of the tube 100 over the entire length of the elongated detent 108. In all such examples, the other pressure roller 102 will move in series with the pressure roller 103.

FIG. 8 shows a perspective view of the forming tube 100 of FIG. 7 and further shows how the positions of the pressing rollers 102 and 103 of FIG. 7 can be fixed inside the tube 100. The supporting device 800 is shown in FIG. 8. The supporting apparatus 800 includes a pressing roller 103, a roller support 805, an extendable shaft 804, a roller support 806, another roller 807, and a supporting shaft 802. The pressure roller 103 to be positioned in the tube 100 is fixed to one end of the roller support 805. Specifically, the pressure roller 103 is rotatably mounted to the support 805 so that the pressure roller 103 is rotatable. The other end of the support 805 is attached to one end of the extendable shaft 804. The other end of the extendable shaft 804 is attached to the roller 807 through the roller support 806. Pressure roller 103 and roller 807 At opposite ends of the support device 800 and all arranged to exert pressure on the inner surface of the tube 100. The extendable shaft 804 can be mechanically adjusted so that the support device 800 applies pressure from the point where the pressure roller 103 exerts pressure on the inner surface of the tube 100 at the position of the elongated detent 108 to the position where the opposing roller 807 contacts the inner surface of the tube 100 The length of the point of the lining material 104 or the inner surface of the pipe member 100 matches the diameter of the pipe member 100. The pressing roller 102 is installed on the outer side of the tube 100 in such a manner that it will contact the outer surface of the tube 100 at the position of the elongated detent 108 pressed by the pressing roller 103, and moves in series with the pressing roller 103.

The extendable shaft 804 may include a biasing mechanism such as a spring to apply force to the pressure roller 103 and the roller 807 located at opposite ends of each other. The pressure roller 103 and the roller 807 respectively apply pressure to the inner surface of the tube 100 at the position of the pair of combined elongated detents 108 and the inner surface of the tube 100 opposite to the position of the pair of combined elongated detents 108 On the other side.

The support shaft 802 extends orthogonally from the position of the extendable shaft 804 in the direction of the length of the tube 100. The length of the support shaft 802 is adjustable.

The support shaft 802 may extend a length longer than the length of the tube 100 to a fixed position outside or outside the tube 100 to fix the position of the support device 800. In the case where the tube 100 moves and the pressure roller 103 remains fixed during the application of pressure, the supporting device 800 needs to be fixed in position.

In another configuration where the tube 100 is held in the same position and the pressure rollers 102 and 103 move across the tube 100, the support shaft 802 may be attached to an actuator (not shown in FIG. 8) to cause the support device 800 to roll to the edge Different positions of the tube 100.

The support 805 and/or the extendable shaft 804 may be configured as a heating device for heating the pressure roller 103, which in turn heats the position of the elongated detent 108. Alternatively, the pressing roller 102 may be one that is heated instead. In another configuration, the pressure rollers 102 and 103 Both may be heated together by the heating device.

In the scope of the specification and patent application, unless the context clearly indicates otherwise, the term "comprising" has a non-exclusive meaning of the word, which means "at least including" and not in the sense of "consisting only of" Exclusive meaning. The same applies to the corresponding grammatical changes in other forms of the word (such as "including", "containing", etc.).

Although the present invention has been described in the present disclosure in conjunction with many specific examples and implementations, the present invention should not be so limited, but can cover various obvious modifications and equivalent configurations that fall within the terms of the accompanying patent application. Although the features of the present invention are expressed in specific combinations within the scope of the patent application, the features covering these features can be configured in any combination and order.

100‧‧‧Pipe fittings

106‧‧‧Relative edge part of tablet 110

108‧‧‧Slender detent

120‧‧‧small gap or opening

Claims (15)

A method for manufacturing a pipe with a coating on the inner surface of the pipe, the method comprising: (a) coating the lining material on one surface of the flat plate; (b) bending the opposite edge portion of the coated flat plate to Forming a pair of elongated detents; (c) bending the coated flat plate and combining the pair of elongated detents to form a pipe; (d) heating a position of the pair of combined elongated detents; and (e) at the pair The heated surface of the combined elongated detent compresses the outer surface of the tube and the opposite inner surface of the tube. The method of claim 1, wherein the lining material is a fluororesin film. The method of claim 1 or 2, wherein the opposing edge portions are curved in opposing directions. The method of any one of claims 1 to 3, wherein the opposing edge portions are each bent to have a width between 10 mm and 20 mm. The method of any one of claims 1 to 4, wherein the opposing edge portions are each bent at an angle between 135° and 170° to form the pair of elongated detents. The method of claim 2, wherein the fluororesin film is a viscous fluororesin having at least one viscous group such as a carboxyl functional group. The method of claim 2, wherein the thickness of the fluororesin film is between 100 μm and 500 μm. The method according to any one of claims 1 to 7, wherein the heating is performed at a temperature between 60°C below the melting point of the lining material and 20°C above the melting point of the lining material. The method according to any one of claims 1 to 8, wherein in the pair of combined slender Pressing the tube at the heated position of the detent is performed using at least two pressure rollers, one of which presses the outer surface of the tube at the heated position of the pair of combined elongated detents, and the other The pressing roller presses the opposite inner surface of the tube at the heated position of the pair of combined elongated detents. The method of claim 9, wherein the heating at the position of the pair of combined elongated detents is performed by heating at least one of the pressure rollers. The method according to claim 9 or 10, wherein the outer surface of the tube is pressed at the heated position of the pair of combined elongated pawls and pressed at the heated position of the pair of combined elongated pawls The pressing rollers of the opposite inner surface of the pipe member move in the direction along the length of the pipe member. The method according to any one of claims 9 to 11, wherein the pressing roller pressing against the inner surface of the pipe at the heated position of the pair of combined elongated detents is connected to the support device in the pipe The first end, and the second end of the support device opposite the first end of the support device include a roller for contacting the lining material that coats the inner surface of the tube or the inner surface of the tube. The method of any one of claims 1 to 10, the method further comprising moving the pipe member in a direction along the length of the pipe member while the heated position of the pair of combined elongated detents is being pressed. A pipe member made by the method of any one of claims 1 to 12, the pipe member having a coating on an inner surface of the pipe member and at least two elongated detents combined with each other to form the pipe member. The tube according to claim 14, wherein the at least two elongated detents are adhered together via the coating.

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