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Title:
METHOD FOR CONNECTING A PLASTIC PIPE, SUCH AS A RAINWATER DISCHARGE, A ROOF DUCT, A ROOF VENTING CHANNEL, AN EMERGENCY OVERFLOW, A SPOUT, AN OVERFLOW, A DOMED SKYLIGHT UPSTAND OR A MASTIC BAR, AND A ROOF COVERING COMPRISING A PLASTIC
Document Type and Number:
WIPO Patent Application WO/2019/164401
Kind Code:
A1
Abstract:
The invention relates to a method for connecting a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), comprising the steps of: - providing a plastic pipe, such as a polyethylene or polypropylene pipe; - providing a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), such as APP or SBS-modified bitumen; - placing the roof covering against the plastic pipe; and - cross-linking the plastic pipe to the plastic in the roof covering. The invention further relates to a combination of a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), wherein the plastic pipe is connected to the roof covering by cross-linking, obtainable according to the method.

Inventors:
BORGHUIS, Jan-Arend (Spoorstraat 1, 7471 BV Goor, NL)
Application Number:
NL2019/050120
Publication Date:
August 29, 2019
Filing Date:
February 25, 2019
Export Citation:
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Assignee:
LEV HOLDING B.V. (Spoorstraat 1, 7471 BV Goor, NL)
International Classes:
E04D13/04; B29C65/00; B29C65/02; B29C65/48; C09J123/00
Domestic Patent References:
WO2011142946A12011-11-17
Foreign References:
DE1281965B1968-10-31
DE6917986U1969-09-25
EP1826334A22007-08-29
GB1319993A1973-06-13
DE3737767A11989-05-24
DE1784988A11972-01-20
US4855172A1989-08-08
US6110311A2000-08-29
Other References:
KOPELIOVICH: "Plastics welding", pages 1 - 5, XP055603169, Retrieved from the Internet [retrieved on 20190708]
ANONYMOUS: "Plastics welding processes", Berlin (DE), pages 1 - 1, XP055603172, Retrieved from the Internet [retrieved on 20190708]
Attorney, Agent or Firm:
' T JONG, Bastiaan Jacob (Hengelosestraat 141, 7521 AA Enschede, NL)
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Claims:
Claims

1. Method for connecting a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), comprising the steps of :

- providing a plastic pipe, such as a polyethylene or polypropylene pipe;

- providing a roof covering comprising a plastic such as atactic polypropylene (APP) or poly (styrene butadiene styrene) (SBS), such as APP or SBS-modified bitumen;

- placing the roof covering against the plastic pipe; and

- cross-linking the plastic pipe to the plastic in the roof covering.

2. Method as claimed in claim 1, wherein the step of cross-linking the plastic pipe to the plastic in the roof covering comprises the step of applying to the pipe an

additive for cross-linking of the pipe to the roof covering before placing the roof covering against the plastic pipe.

3. Method as claimed in claim 2, wherein only additive is applied between the roof covering and the pipe.

4. Method as claimed in claim 1, 2 or 3, further comprising the steps of:

- heating the pipe to a temperature above the melting temperature; and

- heating the roof covering to a temperature above the softening point.

5. Method as claimed in claim 4, wherein the step of cross-linking the plastic pipe to the plastic in the roof covering comprises the step of pressing together and thereby fusing the heated parts of the roof covering and pipe.

6. Combination of a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), wherein the plastic pipe is connected to the roof covering by cross-linking, obtainable according to a method as claimed in any one of the foregoing claims.

7. Combination as claimed in claim 6, wherein the roof covering is provided with an opening through which the pipe extends.

8. Combination as claimed in claim 6 or 7, wherein the pipe comprises a flange attached to the outer wall of the pipe, and wherein the roof covering lies on the flange of the pipe .

9. Combination as claimed in claim 8, wherein the thickness of the flange decreases in radial direction.

10. Combination as claimed in any one of the claims 6-9, wherein the overlapping part of the pipe is roughened.

11. Combination as claimed in any one of the claims 6-10, wherein the outer wall of the pipe comprises thickened portions or sawing grooves extending all around the outer wall of the pipe.

Description:
Method for connecting a plastic pipe, such as a rainwater discharge, a roof duct, a roof venting channel, an emergency overflow, a spout, an overflow, a domed skylight upstand or a mastic bar, and a roof covering comprising a plastic

The invention relates to a method for connecting a plastic pipe and a roof covering comprising a plastic.

Such a method, which methods are used to connect the roof covering to the plastic pipe, more particularly a roof duct, is known from the publication US 6110311 A. In this case the pipe and the roof covering are made of polyvinyl chloride (PVC) . The roof covering is here placed over the plastic pipe and welded thereto. This method has the drawback that the connection is not sufficiently stable and closed, which may result in leakage.

Also known are ducts of lead or zinc, which are used in combination with a roof covering comprising a plastic such as atactic polypropylene (APP) or poly (styrene butadiene styrene) (SBS) . Due to incompatibility between the materials a primer and/or adhesive is here necessary for the bonding.

Shrinkage and expansion of the materials under the influence of heat and cold will certainly result in delamination in the longer term, which could result in leakages. Ducts of lead or zinc furthermore have an environmental impact.

It is now an object of the invention to reduce or even obviate the above stated problems.

This object is achieved with a method for connecting a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), comprising the steps of:

- providing a plastic pipe, such as a polyethylene or polypropylene pipe;

- providing a roof covering comprising a plastic such as atactic polypropylene (APP) or poly (styrene butadiene styrene) (SBS), such as APP or SBS-modified bitumen;

- placing the roof covering against the plastic pipe; and

- cross-linking the plastic pipe to the plastic in the roof covering.

In the method according to the invention it is chosen to select a pipe (such as a rainwater discharge, a roof duct, a roof venting channel, an emergency overflow, a spout, an overflow, a domed skylight upstand or a mastic bar) of a plastic such as polyethylene or polypropylene (including pipes consisting substantially from one of the two or a mixture of these materials) because this increases the compatibility with said roof covering, and to connect this pipe to the roof covering by means of cross-linking. In contrast to the process of welding, chemical and preferably covalent bonds between the plastic in the pipe and the plastic such as atactic

polypropylene (APP) or poly (styrene butadiene styrene) (SBS) are herein formed in the roof covering, these ensuring an excellent connection of the pipe to the roof covering, which reduces the chance of leakage. Techniques for cross-linking of such materials are known to a skilled person.

In a first preferred embodiment of the method according to the invention the step of cross-linking the plastic pipe to the plastic in the roof covering comprises the step of applying to the pipe an additive for cross-linking of the pipe to the roof covering before placing the roof covering against the plastic pipe.

Additives applied to the pipe can contribute to the cross-linking of these materials to the roof covering. These additives can here be aimed at creating functional end groups, which react with the oxygen in the roof covering during the actual cross-linking. An example of such an additive can be based on a mixture of organic peroxides and maleic anhydride, although other additives which are known to the skilled person can equally well be envisaged as additive.

In a second preferred embodiment of the method according to the invention only additive is applied between the roof covering and the pipe.

Because the additive is used, it is no longer necessary to use a primer or an adhesive to bond the roof covering to the pipe.

In a third preferred embodiment of the method according to the invention the method comprises the steps of:

- heating the pipe to a temperature above the melting temperature; and

- heating the roof covering to a temperature above the softening point.

Heating the pipe, or at least the part thereof which will be connected to the roof covering, to a temperature above the melting temperature (or at least to the plastic phase) will enable it to be connected to the roof covering in easier and more stable manner. Heating the roof covering, or at least the part thereof which will be connected to the pipe, to a temperature above the softening point will enable it to be connected to the roof covering in easier and more stable manner. The softening point indicates when the bitumen has a determined deformation. This point can for instance be

measured as according to the Ring and Ball method (NEN-EN 1427) .

During heating use can be made of a mould, such as an electric mould with resistive elements, wherein thicker parts are for instance heated more than thinner parts. As is described in the following, it is for instance possible to provide the pipe with a flange, the thickness of which

decreases in radial direction. It is in this case possible to heat the thicker part of the flange more than the thinner part .

In a fourth preferred embodiment of the method according to the invention the step of cross-linking the plastic pipe to the plastic in the roof covering comprises the step of pressing together and thereby fusing the heated parts of the roof covering and pipe.

By bringing the heated pipe and roof covering into contact the layers fuse together, which further increases the stability of the connection.

The invention further relates to a combination of a plastic pipe, such as a polyethylene or polypropylene pipe, and a roof covering comprising a plastic such as atactic polypropylene (APP) or poly(styrene butadiene styrene) (SBS), wherein the plastic pipe is connected to the roof covering by cross-linking, obtainable according to a method according to the invention.

In a first preferred embodiment of the combination according to the invention the roof covering is provided with an opening through which the pipe extends.

When the roof covering consists of a layer in which is arranged an opening through which the pipe extends, it is easier to obtain a good connection between the pipe and the roof covering.

In a second preferred embodiment of the combination according to the invention the pipe comprises a flange

attached to the outer wall of the pipe, wherein the roof covering lies on the flange of the pipe.

Providing the pipe with a flange, on which the roof covering lies, makes it easier to connect the roof covering to the pipe. The flange here preferably lies substantially parallel to the roof covering, while the pipe (such as a duct) can for instance extend transversely of or at an angle of 45 degrees relative to the flange.

In a third preferred embodiment of the combination according to the invention the thickness of the flange

decreases in radial direction.

A relatively great thickness of the flange close to the pipe provides for a good bond to the roof covering, while a small thickness at the point where the flange connects to the roof covering conversely ensures that a good connection is achieved. Because the flange slopes downward here, water runs more easily from the flange toward the roof covering.

In a fourth preferred embodiment of the combination according to the invention the overlapping part of the pipe is roughened .

The overlapping part of the pipe, i.e. the part connected to the roof covering, is preferably roughened in order to hereby improve the connection.

In a fifth preferred embodiment of the combination according to the invention the outer wall of the pipe

comprises thickened portions or sawing grooves extending all around the outer wall of the pipe.

Providing the outer wall with thickened portions or sawing grooves, such as for instance two thickened portions placed close together, wherein each of the sawing grooves is preferably distributed with regular interspacing over the longitudinal direction of the pipe, such as with an

intermediate space of about 10 centimetres, makes it easy to shorten the pipe to a determined length by sawing off the pipe between the thickened portions. These thickened portions or sawing grooves can moreover connect to an edge of a passage when installed around a tank or downpipe outlet coupling, which results in an optimal seal. These and other aspects of the invention are further elucidated with reference to the accompanying drawings.

Figures 1A, IB and 1C show respectively a perspective view, a top view and a cross-section of a pipe along the line I-I, usable in a method according to the invention .

Figures 2A and 2B show respectively a perspective view and a cross-sectional view of a pipe usable in a method according to the invention.

Figure 3 shows a cross-section of a combination according to the invention.

Figure 1 shows various views of a tubular roof duct 1 for use in the method according to the invention. The tube 2 of roof duct 1 is provided with a flange 3 and sawing grooves 4 arranged in the pipe. The angle is in this case 45

degrees, but can also be 0 degrees. It can also be seen in figure 1C that the thickness of flange 3 decreases in the direction of the free outer end.

Figure 2 shows various views of another roof duct 10, comprising a pipe 11 provided with a flange 12 and sawing grooves 13 arranged in the pipe. The thickness of flange 12 here also decreases in the direction of the free outer end, as can be seen in figure 2B.

Figure 3 shows a roof 100 with an opening 101 arranged therein. Arranged on roof 100 is a bitumen layer 102 in which an opening arranged over opening 101 is arranged.

Roof duct 10 with pipe 11 and flange 12 extends through the opening in bitumen layer 102 and opening 101 in roof 100.