The iMPREGLiner is a glass-fibre pipe liner that is impregnated with an unsaturated polyester resin at the factory and packaged in a special, patented outer protective foil. In the inside of the liner, there is also a pipe foil that serves as an aid to installation and is removed after curing. Due to the long storage stability of the iMPREGLiner (six months from production), there is also sufficient time for installation after transport available to our international customers. The liner is supplied in a stable wooden box (treated in accordance with IPPC standard if necessary), ready to be laid.

Before the pipe liner is inserted, a glide foil is inserted into the base of the damaged sewer. This reduces the friction forces when the liner is inserted into place and prevents the material from getting damaged. The liner is then inserted into the old pipe with a winch located above one of the manholes. Once the liner has been positioned using compressed air, the UV light source is placed into the liner and the liner ends are sealed with packers.

In the liner, the working pressure is increased to 500 mbar and the UV light source is pulled to the other end of the pipe liner. During this process, the camera recording at the light source can be used to check that the liner is cleanly abutting with the UV curing equipment in checking mode. The UV lights are then turned on and the light source is pulled through the liner in accordance with the requirements for curing speed as per iMPREG’s installation manual.

After curing, the packers, the light source and the inner foil are removed. The subsequent work, such as opening and connecting the laterals, can be carried out directly afterwards and the sewer can be put back into operation again.