Abstract: The present invention essentially relates to a process for curing pipe insulation, including the employment of a two-part mold and the utilization of a device for the passage of curing air through the mold and through a pipe insulation preform which is arranged around a core disposed within the mold. The process for the curing of insulating chutes constituted of a fibrous materials, such as wool or the like, completely avoids the formation of any burrs which can conceivably be formed between interengaging and cooperating mold halves, one of which is a female and the other a complementary male component. A sharp and flexible leading edge in the male part is arranged to come into contact with the inner surface of the female part and to slide therealong before making contact with a preform for producing the pipe insulation, which is preferably a thermal wool material.

Abstract: The invention relates to an apparatus for the formation of an insulating material ply, e.g. in the manufacture of insulating chutes. The object is to provide a continuous insulating material ply (17) of a predetermined thickness. A primary ply (14) of surplus thickness is first sawn out of an insulating material roll (1) by rotating the insulating wool roll against the edge of a band saw, and this primary ply (14) is fed to another ply-cutting saw (16) which saws the primary ply into the final ply (17) with the predetermined thickness. The surplus from the primary ply (14) is collected on a drum (19) provided in connection with the ply-cutting saw (16) to form an intermediate storage. When the insulating material (roll) run out, the sawing of the final ply (17) is continued from the intermediate storage without interruption until the leading edge of a new opened insulating material roll (1) reaches the ply-cutting saw (16).

Abstract: The invention relates to an apparatus for winding a ply of an insulating material on to a core (8) to form a chute. The apparatus comprises a movable, endless belt (1) which is bent around the core for the time of the winding, so that the insulating material ply is wound between the core and the belt. In order to wind insulating chutes of greatly varying diameter within a space as small as possible, a turnable means (10) is provided outside both edges of the belt in the winding area of the belt, so that they turn perpendicularly to the plane of the belt between a position of readiness and a winding position. The belt (1) is arranged to pass via a roll (19) mounted between said turnable means (10) so as to follow their movement. The roll (19) is displaceable between a receiving/delivering position and a winding position of the core (8).

Abstract: The invention relates to an apparatus for the manufacture of insulating chutes. The apparatus comprises means for winding plies of insulating material on to cores; means for curing the insulating material wound on the cores; means for removing cured insulating material from the cores; and means of or returning empty cores to the winding step. The object is to make the operation of this kind of apparatus more efficient than previously. The object is achieved in such a manner that the cores (12) are arranged in groups on an endless transporter (1), whereby empty spaces corresponding to the number of cores in a group are left between the groups of cores, and the transporter is arranged to move step by step a distance corresponding to the interspace between individual cores in a group when the first core in each group reaches the winding means, and a distance corresponding to the interspace between the groups when the last core in each group leaves the winding step.