A flexible hose including a first tubular element of corrugated shape having in longitudinal cross-section a series of outer crests and a second tubular element of lightweight polymeric material externally associated with said first tubular element so as to fill at least partially a corresponding series of troughs alternately shaped by said outer crests.

A system and method for replacing or substituting mold blocks in a corrugator, the corrugator comprising first and second tracks for carrying respective chains of mold blocks, each of the tracks comprising return tracks, wherein the system advances replacement mold blocks towards the return tracks to displace corresponding mold blocks in the mold block chains while the corrugator is in production and while the mold block chains are in motion.

A system and method for replacing or substituting mold blocks in a corrugator, the corrugator comprising first and second tracks for carrying respective chains of mold blocks, each of the tracks comprising return tracks, wherein the system advances replacement mold blocks towards the return tracks to displace corresponding mold blocks in the mold block chains while the corrugator is in production and while the mold block chains are in motion.

A corrugated pipe includes a corrugated pipe body circumscribing a hollow conduit and including alternating ribs and valleys extending along a longitudinal axis between a first end and a second end thereof. An electrically conductive wire is embedded in the corrugated pipe body, so that the wire spans adjacent ribs and valleys and extends substantially parallel to the longitudinal axis between the first and second ends.

The invention relates to a manufacturing method and a manufacturing equipment for a corrugated net. The manufacturing method comprises steps of: injecting a thermoplastic plastic mesh material, the plastic mesh material having an injection temperature; directly reducing a temperature of the plastic mesh material from the injection temperature to a moldable temperature; and pressing the plastic mesh material with the moldable temperature to cause the plastic mesh material with the moldable temperature to form creases. The invention is capable of reducing manufacturing procedures and time by directly adjusting the injected plastic mesh material to the moldable temperature and pressing to form creases without requiring heating equipment, and the moldable temperature of the overall plastic mesh material is uniformly set to be capable of improving an effect of forming corrugated structure for the mesh material.

The invention relates to a manufacturing method and a manufacturing equipment for a corrugated net. The manufacturing method comprises steps of: injecting a thermoplastic plastic mesh material, the plastic mesh material having an injection temperature; directly reducing a temperature of the plastic mesh material from the injection temperature to a moldable temperature; and pressing the plastic mesh material with the moldable temperature to cause the plastic mesh material with the moldable temperature to form creases. The invention is capable of reducing manufacturing procedures and time by directly adjusting the injected plastic mesh material to the moldable temperature and pressing to form creases without requiring heating equipment, and the moldable temperature of the overall plastic mesh material is uniformly set to be capable of improving an effect of forming corrugated structure for the mesh material.

A seamless convoluted hose assembly. The assembly includes: a tubular inner liner having an outer surface, an inner surface, and an inner liner wall therebetween which defines a passageway. The assembly further includes a helical coil or a plurality of annular loops which produce convolutions in the outer surface of the tubular liner when the tubular inner liner is forced through the helical coil or plurality of loops under heat and pressure.

A seamless convoluted hose assembly. The assembly includes: a tubular inner liner having an outer surface, an inner surface, and an inner liner wall therebetween which defines a passageway. The assembly further includes a helical coil or a plurality of annular loops which produce convolutions in the outer surface of the tubular liner when the tubular inner liner is forced through the helical coil or plurality of loops under heat and pressure.

A two stage mold block transfer station is used the exit of a moving mold tunnel to quickly move mold blocks to a clear position relative to the molded product. Once in the clear position the mold block is rotated and provided to a return drive moving the mold block back to the inlet of the moving mold tunnel. By moving the last mold block of the moving mold tunnel primarily away from the longitudinal axis of the mold tunnel less mold blocks are required. Various arrangements for moving of the mold blocks can be used achieve this advantage.

A two stage mold block transfer station is used the exit of a moving mold tunnel to quickly move mold blocks to a clear position relative to the molded product. Once in the clear position the mold block is rotated and provided to a return drive moving the mold block back to the inlet of the moving mold tunnel. By moving the last mold block of the moving mold tunnel primarily away from the longitudinal axis of the mold tunnel less mold blocks are required. Various arrangements for moving of the mold blocks can be used achieve this advantage.