Abstract
A shielded pipe contains a pipe from chlorinated polyvinyl chloride (cPVC) and a collar which shields the pipe from the environment. The collar contains a bandage which is wrapped around the cPVC pipe, where the bandage contains a carrier layer and a functional layer. The shielded pipe can be used in a corresponding a wall duct. The bandage is useful for shielding a pipe.
Claims
1. A shielded pipe, comprising: a pipe from chlorinated polyvinyl chloride (cPVC), and a collar which shields the cPVC pipe from the environment, wherein the collar comprises a bandage which is wrapped around the cPVC pipe, and wherein the bandage comprises a carrier layer and a functional layer.
2. The shielded pipe according to claim 1, wherein the carrier layer is a metal foil.
3. The shielded pipe according to claim 1, wherein the functional layer has a form of parallel strands.
4. The shielded pipe according to claim 3, wherein the parallel strands are arranged in cross direction of the bandage.
5. The shielded pipe according to claim 1, wherein edges of the carrier layer are folded to cover adjoining sections of the functional layer.
6. The shielded pipe according to claim 1, wherein the bandage comprises at least one sealing strand in a longitudinal direction of the bandage.
7. The shielded pipe according to claim 6, wherein the sealing strand consists of polymer foam.
8. The shielded pipe according to claim 1, wherein the collar has a width of 125 mm to 400 mm.
9. The shielded pipe according to claim 1, wherein he functional layer is an intumescent layer.
10. The shielded pipe according to claim 1, wherein the functional layer is a compressed and elastic foam strip configured to provide a structure born noise decoupling, or wherein the functional layer is an intumescent, compressed and elastic foam strip configured to provide fire-resistance.
11. A wall duct, comprising: a wall having an opening, wherein the shielded pipe of claim 1 transits the opening, and wherein a sealing separates the collar from the opening and seals the wall duct.
12. A bandage for shielding a chlorinated polyvinyl chloride (cPVC) pipe, the bandage comprising: a carrier layer, and a functional layer.
13. A method of shielding a pipe, comprising: wrapping the bandage of claim 12 around a chlorinated polyvinyl chloride (cPVC) pipe.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0041] The above embodiments and aspects of the invention are outlined further in the following examples and figures. The figures are schematic and the dimensions could be, but are not necessarily, drawn to scale. The figures show:
[0042] FIG. 1 a schematic view of a wall duct which is traversed by the shielded pipe of the invention
[0043] FIG. 2 a schematic view of a bandage of the invention
[0044] FIG. 3 an enlarged schematic view of the wall duct of FIG. 1
[0045] FIG. 4 a schematic view of an embodiment of the bandage with parallel strands of functional layer
[0046] FIG. 5 an enlarged view of an embodiment of the bandage with parallel strands of functional layer and folded edges
[0047] FIG. 6 a schematic view of an embodiment of the bandage with parallel strands of functional layer and sealing strands.
DETAILED DESCRIPTION OF EMBODIMENTS
[0048] FIG. 1 shows an embodiment of a wall duct 10. The shielded pipe 1, consisting of a cPVC pipe 2 with collar 3 from bandage 4, traverses an opening 12 of wall 11. A sealing 13 is located between opening 12 and collar 3, which seals opening 12 and can also fixate the shielded pipe 1 in the opening 12. In the embodiment shown, bandage 4 is wrapped twice around cPVC pipe 2. The intumescent layer of bandage 4 can prevent fire from passing the wall 11, whereas the carrier layer can provide an efficient barrier against chemicals, such as softeners. The shielded pipe 1 can advantageously be used in such a system without the need for prior testing the compatibility with the sealing 13 or other components.
[0049] FIG. 2 shows a schematic view of bandage 4 for shielding a cPVC pipe. Bandage 4 is wrapped up repeatedly around core 5. Typically, the width of bandage 4 depends from the thickness of a wall, into which the shielded pipe shall be inserted, with overhangs on each side.
[0050] FIG. 3 shows a schematic and view of an embodiment of a wall duct 10, which is enlarged at the position at which shielded pipe 1 enters a wall 11. As also shown in FIG. 1, the bandage 4 is wrapped around cPVC pipe 2 to form a collar, which contacts the circular sealing 13 in wall opening 12. In principle, when entering the cutting edge 15 in direction of the arrows, chemicals such as softeners could diffuse out of sealing 13 into voids of the collar, creep along voids between layers of bandage 4, and may finally even contact cPVC pipe 2. However, such undesirable creeping of chemicals into the collar can be prevented according to the invention by providing the functional layer in the form of parallel stripes, as shown in FIG. 4.
[0051] In FIG. 4, an embodiment of bandage 4 is shown in schematic view comprising carrier layer 6 and on its surface functional layer 7 in the form of parallel strands 8. When such a bandage 4 is wrapped around a cPVC pipe, internal parallel voids are present between strands 8. Thereby, the parallel strands favor movement of chemicals in a direction parallel to the strands 8, which neither results in undesirable contact with the cPVC pipe, nor undesirable passage through the wall opening. Thus, the parallel strands 8 inhibit movement of chemicals into the collar in direction towards the cPVC pipe. Contact of chemicals with the cPVC pipe can be prevented further by wrapping the bandage around the cPVC pipe multiple times, for example at least two or three times.
[0052] FIG. 5 shows a schematic and enlarged view of an embodiment of bandage 4 with carrier layer 6 and functional layer 7 as parallel strands 8, in which the edges 14 of carrier layer 6 are folded, such that they cover adjoining sections of the functional layer 7. Thereby, intrusion of chemicals, but also gas, smoke or moisture, into the collar can be prevented. The arrows indicate the folding direction of the edges 14. When the bandage 4 is provided in roll form, as shown in FIG. 2, 4, 5 or 6, the shielded pipe 1 is prepared by unwinding bandage 4 and cutting a section having a desired length. Preferably, the terminal sections of carrier layer 6 are folded into edges 14, which cover adjoining regions of the functional layer 7. It is advantageous that the carrier layer 6 is a metal foil, especially aluminum foil, because it can be folded easily and maintains its shape after folding. By folding all four edges, all sides of the collar can be protected against the environment, thereby providing an overall tightly packed and closed collar for the cPVC pipe.
[0053] FIG. 6 shows a schematic view of an embodiment of a bandage 4, as described above, which further comprises sealing strands 9 arranged in longitudinal direction of the bandage 4. The sealing strands 9 provide an internal barrier against undesirable movement of chemicals, smoke, moisture, sound, smells or the like in cross direction of bandage 4. Preferably, sealing strand 9 is in central position. Preferably, it is elastic and can be compressed, such that efficient internal sealing of the cPVC pipe is achieved. It is preferred that sealing strand 9 is slightly higher than the parallel stands 8 of functional layer, because this can improve overall tightness of the collar. Preferably, sealing strand 9 consists of plastic foam, which may consist of EPDM, PE or polyurethane, and which preferably does not comprise softeners. Preferably, in the shielded pipe the terminal outer end of sealing strand 9 is not in direct contact with sealing 13 in wall opening 12. Preferably, the bandage 4 comprises an outer folded edge 14, which also covers the terminal outer end of the sealing strand 9, thereby preventing contact with the sealing 13. The terminal edge of sealing strand 9 may also be covered with adhesive tape, such as aluminum tape.
[0054] When the shielded pipe 1 traverses a wall 11 in a wall duct 10, as shown in FIG. 1 or FIG. 3, the width of collar 3 is typically the same as the width of bandage 4, and preferably about 250 to 300 mm. In this regard, it is preferred that the width of the collar 3 and/or bandage 4 is the sum of the thickness of the wall and additional sections of at least 50 mm on each side of the wall opening. For example, for a wall having a thickness of 150 mm, the collar should have a length of at least 250 mm, such that it can protrude at least 50 mm out of the wall on each side. This is advantageous, because the protection by the collar against chemicals or fire is extended to sections outside the wall opening, which may for example contact chemicals from the wall under strain or stress.
LIST OF REFERENCE SIGNS
[0055] 1 shielded pipe
[0056] 2 cPVC pipe
[0057] 3 collar
[0058] 4 bandage
[0059] 5 core
[0060] 6 carrier layer
[0061] 7 functional layer
[0062] 8 parallel strands
[0063] 9 sealing strand
[0064] 10 wall duct
[0065] 11 wall
[0066] 12 opening
[0067] 13 sealing
[0068] 14 edge
[0069] 15 cutting edge
