CURED-IN-PLACE PIPE LINER

Abstract

A CIPP liner for repairing a sewer pipe comprises a cover fabric (1) and a base fabric (2) to be attached to each other using needle punch technology, as well as a stretchable plastic membrane (4) attached to the base fabric (2) with a flexible glue (3), into which flexible glue (3) also the with each other mixed fibres (5) of the cover fabric (1) and the base fabric (2) are glued. From this material, a CIPP liner corresponding to the dimensions of the sewer pipe is cut and sewn, the sewing seam of which is further taped.

Claims

1. A method for producing a CIPP liner, characterized in that at least one cover fabric (1) arranged in both longitudinal and transverse directions in waves and/or pleats and a base fabric (2) or an evenly spread cover fabric (1) and a base fabric (2) stretched in one or more directions are arranged against each other, from the side of the cover fabric (1), needle punch needles (7) are pressed through the cover fabric (1) and the base fabric (2), wherein the fibres of the fabrics (1) and (2) mix with each other and the mixed fibres (5) extend to the outside of the surface of the base fabric (2), the needle punch needles (7) are removed, the base fabric (2) and plastic membrane (4) are attached to each other with a flexible glue (3), wherein, at the same time, the mixed fibres (5) are attached by the glue (3) to each other, when the glue (3) has dried, from the created CIPP liner fabric, a piece of the requisite size is cut and sewn into the shape of a CIPP liner and the sewing seams are taped.

2. A CIPP liner for repairing a sewer pipe, characterized in that the CIPP liner cut according to the diameter of the sewer pipe, sewn and taped from the sewing seam includes, to provide a flexible CIPP liner, at least one cover fabric (1) arranged in both the longitudinal and transverse direction in waves and/or pleats and a base fabric (2) of different materials and having different maximum lengths of elongation attached to each other using needle punch technology, as well as a stretchable plastic membrane (4) attached with glue (3) to the base fabric (2), into which flexible glue (3) also the with each other mixed fibres (5) of the cover fabric (1) and base fabric (2) are glued.

3. A CIPP liner for repairing a sewer pipe according to claim 2, characterized in that as the cover fabric (1) is used a fabric that is stretchable to be even 70-80 percent larger in comparison to its non-stretched state.

4. A CIPP liner for repairing a sewer pipe according to claim 2, characterized in that as the base fabric (2) is used a fabric having different elongation properties in relation to the longitudinal and transverse directions.

Description

[0007] In the following, the invention is described in more detail with reference to the accompanying drawings, in which

[0008] FIG. 1 shows a cross-section of the fabric structure of a CIPP liner according to the invention.

[0009] The cover fabric 1 is teased and placed against the base fabric 2, after which, from the side of the cover fabric 1, the needle punch needles 7 are pressed through the cover fabric 1 and the base fabric 2, wherein the fibres of both fabrics 1 and 2 mix with each other and the mixed fibres 5 extend to the outside of the surface of the base fabric 2. The needle punch needles 7 are removed. The base fabric 2 is glued with flexible glue 3 to the plastic membrane 4, at the same time gluing the mixed fibres 5 to each other. Thus, an elastic layer 6 between the base fabric 1 and the cover fabric 2 is formed. When the glue 3 has dried, from the CIPP liner fabric created, a piece of the requisite size is cut and sewn into the shape of a CIPP liner and the sewing seams are taped.

[0010] There are many alternative implementations for the invention, for example, the use of two cover fabrics instead of one in the CIPP liner.