NL9100511A - Reinforced thermosetting resin pipe liners - are post-cured after installation to develop resistance after insertion in a flexible phase - Google Patents

Abstract

Rigid rubing is made by preparing a flexible tube comprising uncured thermosetting resin enclosed between two coaxial flexible sleeves, and shaping and locating the composite tube in a suitable jig or holder before curing the resin by exposure to heat/pressure/infusion by a catalytic reagent. Suitable for mfr. of pipe systems or for insertion into existing systems as a lining to resist or nullify cracking of established pipes for e.g. potable water or sewage distribution. Arrangement combines the strength and chemical resistance of a crosslinked pipe structure with the ease of one side installation of a flexible liner.

Description

Extract

Device for manufacturing tubes of curable synthetic resin, composed of a tubular inner foil, a fabric layer of fiber material, a tubular outer foil and a layer of curable synthetic resin arranged between the inner foils, which device has a molding mandrel, around a first part with a constant diameter, of which a stock is tubular inner film is provided, which is held with holding means under constant set pressure against the mold mandrel, a nozzle device which is arranged around a second part of the mold mandrel for applying curable synthetic resin to the inner film drawn from the stock inner film around the mold mandrel, one after the nozzle device rotated around the mold mandrel braiding head for braiding a fabric layer around the curable synthetic resin applied to the inner foil and a stock of tubular outer foil disposed after the braiding head and a device for pulling the outside foil together with the inner foil from the device provided with a plastic layer and fabric layer provided from the mold mandrel and braiding head.

Title: Apparatus for manufacturing tube-curable synthetic resin.

The invention relates to a device for manufacturing pipes from hardenable synthetic resin, in particular for sealing / or reinforcing internal or external pipe lining and consisting of a multilayer flexible hose with a hose-shaped inner foil, a layer of fiber material, a hose-shaped outer foil and from a layer of curable synthetic resin disposed between the inner foil and the outer foil, wherein the hose can be adapted to pipes or the like and can be brought into a form-stable condition by subsequent curing.

British Pat. No. 1,357,355 discloses an apparatus for manufacturing a tube of the type indicated, wherein a flat tubular tube of inner foil is passed from a supply roll through the apparatus, at the same time discharging a sheet of tissue material from a second supply roll and along with the tubular inner film is passed through the device and folded around the inner film. The parts assembled in this way are then passed through a device for fastening together the overlapping edges of the fabric layer folded around the inner foil. Then, the tube formed in this way is guided between a pair of feed rolls, each of which carries a roll of plastic film, immediately greater in width than the flat composite tube passed through it. From each roll, the plastic film is moved along the top and bottom of the composite tube with the plastic tube overlapping the entire tube and then welded together with their edges, the inner tubular film and the fabric layer disposed around it, thereby enclosing a three-layer composite tube . The pipe formed with the known device is treated immediately before it is used for lining pipes, with a device for impregnating the fabric layer with uncured, curable synthetic resin. Thereby the outer foil is punctured and curable resin is injected or injected.

A drawback of the known device is that the introduction of the synthetic resin is very complicated and can only be carried out with a special device. This can result in an uneven distribution of the synthetic resin and, as a result, an undesirable instability after it has cured. A further drawback is that the injected synthetic resin has only a relatively short time available until it has completely cured, so that there is a risk of an incorrect adjustment of the coating.

The object of the invention is to provide a device which avoids the above-mentioned drawbacks and according to the invention this object is achieved in that it possesses a stock of tubular inner foil, a forming dowel over which the inner foil can be drawn, a device for advancing the inner foil around the forming mandrel, a nozzle device for the application of curable synthetic resin to the inner foil disposed on the mold, a braiding head rotated after the nozzle rotatable around the mold mandrel for braiding a fabric fiber fabric layer about the curable synthetic resin applied to the inner foil and a stock hose-shaped outer foil applied after the rotating braiding head device for pulling off outer foil from the stock and applying it around the applied fabric layer.

The device according to the invention can rationally and inexpensively produce a single tube which is ready for use and available, whereby no additional device is required for applying curable synthetic resin directly before application of the tube. With the nozzle arranged in the device, curable synthetic resin can be applied very evenly to the inner tubular film. Furthermore, with the rotating braiding head, a braided fabric layer can be applied to the curable resin, the fabric layer consisting of intersecting wires and thereby, as long as the curable resin is not cured, expandable and contractible, making the composite tube easily adaptable to the pipelines using the tube . With the apparatus of the present application, it is very rationally and inexpensively possible to manufacture tubes of the type which are the subject of the parent application 7808226 from which the present application is a division.

Preferred embodiments of the device according to the invention are characterized in the subclaims.

The invention is further elucidated with reference to the drawing with the figures below, in which:

Figure 1 is a sectional view of a preferred embodiment of the tube, showing the components of the tube,

Figure 2 is a side view, partly in section, of a pipe manufacturing apparatus with certain parts omitted for clarity,

Figure 3 is a detailed view of some parts of the device,

Figure 4 is a sectional view taken generally along line IX-IX in Figure 7, showing a braiding head mounted in the device,

Figure 5 schematically shows the course of a guide groove for movable bobbin winding bobbins,

Figure 6 is an enlarged sectional view of a braid head drive mechanism,

Figure 7 is a section on line XIII-XIII in Figure 7.

Figure 1 shows by way of example a tube which can be manufactured with the device according to the invention. The displayed tube is described in more detail in Dutch patent application No. 7808226, of which the present application is a division. The tube is formed from a layer 1 of thermosetting resin, which is sandwiched between a tubular inner foil 2 and a tubular outer foil 3, while in the shown tube, a longitudinal reinforcement layer 7 for increasing the tensile strength of the tube is applied to the layer of thermoset resin and which consists of a hose made of cross-braided wires 5, 6.

Referring to Figures 2 to 6, there is schematically shown an embodiment of the device according to the invention with which the above-described tube can be manufactured in an efficient manner. In addition to a frame, which is not shown in the figures for the sake of clarity and simplicity, the device includes a mold mandrel 10 which is movable in a bearing or a guide sleeve 11 supported by the frame, the mandrel relative to the sleeve 11 can be moved, for example, by means of a piston-cylinder device (not shown). Figures 2 and 3 show the mandrel 10 in operative position, in which the mandrel at its upper portion 10, which faces the sleeve 11, is provided with a foil stock 2A, which is held on the mandrel 10 by means of claws 12, which abut against and around the mandrel. mandrel and which are supported by arms 14, which can swing outwardly by piston-cylinder means 13. It is the intention that the foil 2 is drawn out between the said claws and the mandrel against the action of a force determined by the contact pressure of the claws against the foil 2 arranged around the mandrel 10, which contact pressure is adjustable by the piston-cylinder means 13. The mandrel 10 extends in its operating position from the claws 12 through a spray nozzle 15 and a braiding head 16, a part 10b of which constant diameter, which diameter should substantially correspond to the largest inner diameter the tube should have. The mandrel supply part 10a, i.e. the part of the mandrel around which the film supply is arranged, may however have a slightly smaller diameter, although this is not necessarily necessary, because the tubular film as such will have a slightly larger diameter than the said part of the mandrel so that it will not stick during its movement along the doom 10. The mandrel portion 10b terminates at the same height as a braid surface 17 defined by a guide plate or braid mouth 18, after which the size of the mandrel decreases conically to a diameter smaller than the smallest inner diameter of the hose.

For the outer foil 3, a foil stock 3A is provided as shown around a tube or sleeve 18, from which the foil 3 is pulled by a hose folding device 20 formed within the sleeve, together with the inner foil 2 coming from the mandrel 10 and the braiding head 16, by means of a device 21 for moving the manufactured hose at a constant speed, by which device 21 the production speed can be controlled.

The spray nozzle 15 is disposed around the mandrel 10 and is supported in a further detail, not shown in detail, by the frame of the device. A thermosetting resin mass, mixed with a large amount of filler material, preferably flakes, is pressed from a source (not shown) into the spray nozzle 15 through conduits 22 and into a chamber 23 within the spray nozzle through openings 25 provided in one wall 24 of said chamber . The other wall of the chamber consists of the mandrel 10 and the foil 2, which is placed around the mandrel, which is movable at constant speed during operation. The chamber 23 has a conical shape and terminates in an annular discharge opening 26, the width of which defines the thickness of the layer 1 of plastic material which is applied over the inner foil layer as it is drawn through the nozzle 15. In addition to the said openings 25, a further series of openings may be provided in the chamber wall 24 in the vicinity of the discharge opening 26 for applying flakes to the outer surface of the thermosetting resin layer. In this case, the amount of flakes that are mixed with the plastic mass can be reduced and in some cases omitted. Due to its stickiness when applied to the film 2, the thermosetting resin mass adheres to the film 2 and along it follows the path through the braiding head 6, where the reinforcement 7 is applied, and through the folding device 20 where the outer film 3 is applied around the reinforcement 7 and the adhesive thermosetting resin layer, which is then protected by the outer foil.

In the braiding head 26, the textile reinforcement 7 is braided directly onto the thermosetting resin layer while the inner film is continuously advanced longitudinally along the mandrel 10. For this purpose, the braid head 16, which is rotatably placed on a table 28 mounted in the frame, is provided with thread spools 29 for, for example, the reinforcing wires 5. which spools are fixed with respect to the rotating braid head and are equidistant on the outside thereof. The bobbins move together with the braid head 15 and the thread bobbins 30 for the other reinforcement threads, that is, the threads 6 in the embodiment, which bobbins 30 are movable relative to the braid head 15 and in the illustrated embodiment are evenly distributed on the inside of the braid head. The movable bobbins 30 move in a direction opposite to the direction of movement of the braid head 15 along a substantially sinusoidal guideway 31 (FIG. 5). in the plane of symmetry of which the fixed blocks 29 are placed with their centers, whereby the movable blocks 30 move above and below each second of the fixed blocks. Due to this relative movement between the fixed and movable thread spools 29.30, the wires 5 * 6 are braided together around the thermosetting resin layer 7 and the inner foil 2 by guiding the braiding mouth 18, which with its inner edge 32, which is close to the outer surface of the plastic layer, acts as a support for the wires 5,6 and allows the braiding to take place mainly in the braiding surface 17, i.e. slightly above the conical part of the mandrel. In the said braiding surface, the reinforcement is braided around the thermosetting resin 1 to its largest diameter. When the braided reinforcement, which is placed on the cylindrical part of the mandrel, is exposed to the tensile forces exerted by the supply means 21, first of all, the reinforcement parts closest to the conical part of the mandrel are tightened to the plastic layer1, that is to say that the angle α between the wires 5 »6 becomes slightly smaller, increasing the forces that tend to retain the reinforcement on the cylindrical part of the mandrel, while also increasing the tension in the reinforcement between the mandrel and the spring actuated guide wheel 33 for maintaining a constant tensile strength increases, whereby the reinforcement therebetween is stretched and contracted to its smallest diameter, showing the reinforcement as it passes along the guide wheel 33, while also subtracting reinforcement from the cylindrical mandrel portion. The increase in length given to the reinforcement is due to the contraction with respect to the film 2 passing through the braiding surface 17 at a constant speed, compensated by a certain sliding movement between the film and the thermosetting resin layer 1 and directed by the forces opposite to it. said tensile forces which tend to hold the reinforcement on the cylindrical mandrel portion, thereby preventing the movement of the plastic layers closest to the reinforcement so that these layers will move at a slightly slower speed than the plastic layers closest to the foil. This is made possible due to the viscous or doughy consistency of the thermosetting resin that allows for greater mutual movement between the different layers without greater resistance and results in the thermosetting resin layer being stretched and thinning than it was at the beginning. In order to retain a certain part of the plastic in connection therewith, the doom 10 in the transition area to the conical part is provided with a number of grooves 34 parallel to the feed direction, in which grooves a certain amount of plastic can be pressed together with the foil, which foil is folded slightly.

Instead of braiding the reinforcement directly on the thermosetting resin layer, the reinforcement can be braided on a thin sleeve 35, which for example hangs from the nozzle and surrounds the thermoset layer, as shown schematically in Figure 3 by dotted lines. This sleeve 35 terminates with its lower edge slightly below the braid surface 17 and is split in its lowest part to form resilient fingers 36 which support the reinforcement, around which the reinforcement can be contracted and from which the reinforcement is subtracted when subjected to the necessary tension. In this case, the film 2 and the plastic layer 1 move freely within the sleeve 35, whereby the thermosetting resin layer is less exposed to disturbances than in the example described above and substantially retains its thickness.

The braiding head 16 is driven at a constant rotational speed, which speed is set to the feeding speed to the foil, by a motor 37 via a gear 38 and a pinion 39. cooperating with a toothed sprocket 40 mounted on the outside of the braiding head and there entirely around it. Fixed on the table 28 is a sprocket 41, which extends all the way around it, which sprocket rotation of the braiding head drives a drive wheel 44 which is attached to the bottom surface of the braiding head, which drive wheel, via an intermediate wheel 45, drives a chain 46 placed between the walls 42, 43 and which extends completely around the braiding head, to which chainable movable bobbin 30 is fixedly connected via its axis 47 following the guide path. In order for the chain 46 and the intermediate wheel 45 to engage with each other, a holding wheel 48 which is engaged with the chain may be arranged above the intermediate wheel 45

Each shaft 47 extending through a groove 50 following the guideway 31 in the inner wall 42 is provided at its end with a journal 51 which is tightly screwed into said end and which forms a guide splines in the chain. The axle journal 51 carries at its end a bearing 52 between two flanges 53 which form the guideway 31 and which are attached to the inside of the outer wall 43 of the braid head. Furthermore, a U-shaped sliding shoe 54 is mounted on each shaft journal 51 between the chain 46 and the flanges 53 · To prevent the shaft 47 from moving inwardly, between a stop disc 56, which is connected to the shaft and the inner wall 42, is a spring 55, which inner wall can be reinforced at 47 on both sides of the groove 50. For guiding the shaft over the inner surface of the inner wall 42, the shaft can be provided with a guide plate 58 running between guide flanges 59 extending along the guide track 31 and placed on the inner surface of the inner wall.

Each movable thread bobbin 30 is interchangeably attached to its radially inwardly directed hollow shaft 47, which acts as a guide tube over the thread, which is unwound from the bobbin by a known and therefore not shown winding device and is then braided together with the threads 5 from the rigid bobbins 29, which are also each interchangeably mounted on a radially inwardly extending tubular shaft 60, and are unwound from the wires 5 in the same manner as the movable bobbins 30, at a speed set to the rotational speed of the braiding head about the target braid tension in wires 5, 6.

After the braiding head, as mentioned above, the outer foil 3 is applied around the reinforcement 7 by pulling this foil off its supply. Thereafter, the hose consisting of the inner foil 2, the thermosetting resin layer 1, the reinforcement 7 and the outer foil 3 is pulled through the folding device 20, in which the hose is folded together into a flat cross-sectional shape, shown in Fig. 7. The device 20, for this purpose, has a taper through the opening 62, with two opposing flat surfaces 63, and with fold-forming strips (not shown), which extend vertically between said flat surfaces and which face each other, to form the folds 64 in Figure 7. The hose thus folded is then wound on a drum 65, which is driven via the feed device 21 or which is provided with a separate drive means, on which drum the hose is then stored until it is to be used.

It is pointed out that the invention is not limited to the embodiment discussed above with reference to the drawing.

Claims (7)

Device for manufacturing pipes from hardenable synthetic resin, in particular for sealing and / or reinforcing internal or external pipe lining and consisting of a multilayer flexible hose with a hose-shaped inner foil, a layer of fiber material, a hose-like outer foil and a the inner foil and outer foil applied layer of curable synthetic resin, whereby the hose can be adapted to pipelines or the like and can subsequently be brought into a dimensionally stable condition by subsequent curing, the device being characterized in that it has a stock of tube-shaped inner foil (2A), a forming mandrel (10) over which the inner foil (2) can be drawn, a device (12, 13, 14, 21, 33) for advancing the inner foil (2) around the forming mandrel (10), a nozzle device (15) for applying curable synthetic resin (1) on the inner foil (2) located on the forming mandrel (10), after the nozzle device (15) rotating braiding head (16) arranged around the forming mandrel (10) for braiding a fabric layer (7) of fiber material around the curable synthetic resin (1) applied to the inner foil (2) and a supply of tubular outer foil (3A) which is applied after the rotary braiding head (16) as well as a device (21,33) for pulling the outer foil (3) away from the stock (3A) and applying it around the applied fabric layer (7). Device according to claim 1, characterized in that the molding mandrel (10) has, in operating position, a first part (10a) of constant diameter for which the supply of tubular inner foil (2A) is arranged, whereby means (12, 13, 14) are arranged. for holding the film (2) against the molding mandrel (10) with adjustable contact pressure, while the molding mandrel further extends from the holding means (12, 13, 14) with part (10b) through a spray nozzle (15) for dispensing curable plastic and a braiding head (16), which portion (10b) has a constant diameter substantially corresponding to the major diameter of the tube to be manufactured and which portion (10b) terminates at a braid mouth (18) of the braiding head (16) and thereafter merges into a section whose diameter decreases conically to a diameter, which is smaller than the smallest diameter of the pipe to be manufactured, while a stock (3A) of flake-shaped outer foil spaced downstream of the forming mandrel (1 0) is applied. Device according to claim 1 and / or 2, characterized in that the braid head (10) rotating around the shape of the steam is placed on a table (28) which is arranged in the frame of the device, which braid head is provided on the outside thereof equally spaced thread spools (29) on which reinforcement threads (5) are wound on the inside of equidistant thread spools (30) on which reinforcement threads (6) are wound, which thread spools (30) are movable in a direction opposite to the direction of movement of the braiding head (16) along a substantially sinusoidal guideway 31 »in the plane of symmetry of which the bobbins (29) are positioned with their centers. Device according to claim 3 *, characterized in that at least around the part of the forming mandrel (10b) extending from the nozzle (15) to the braiding head (10) is a sleeve (35), the end of which ends in itself resilient fingers (36) extending into the braiding head (16) to a slightly braided surface (17). Device according to any one of the preceding claims, characterized in that the tubular outer foil (3) in the form of an accordion-like stock (3A) is arranged around a fixed sleeve (19) within which sleeve (19) a hose forming device (20 ), a device (21, 33) is provided after the sleeve with the folding device for drawing the outer foil (3) at a constant rate from the outside of the sleeve (19) through the forming device (20), together with the from the molding mandrel (10) and braiding head (16) from an inner foil (2) provided with a plastic layer and fiber reinforcement. Device according to any one of the preceding claims, characterized in that the spray nozzle (15) comprises a conical chamber (23) with an outer wall (24) provided with openings (25) for supplying plastic material, the inner wall being formed by the molding (10) and the foil (20) disposed about the molding mandrel, and the chamber of which has its narrowest end terminates in an annular discharge opening (26) about the molding mandrel (10) and the inner foil (2) mounted thereon. Device according to claim 6, characterized in that said outer wall (24) of the nozzle chamber (23) has a series of additional openings (26) in the vicinity of the annular discharge opening (26) for applying filler material to the outer surface of the plastic layer (1).