Abstract: An extensible corrugated hose comprises a first bearing layer (1) in a elastically extensible first polymeric material, a reinforcement (2) wound on said first layer (1), a stabilizing second layer (3) in an elastically extensible second polymeric material covering the reinforcement (2) for defining a corrugated single tubular body (4) with the first layer (1), a coating third layer (5) placed on the second layer (3) for covering the corrugated single tubular body (4).

Abstract: An extensible corrugated hose comprises a first bearing layer (1) in a elastically extensible first polymeric material, a reinforcement (2) wound on said first layer (1), a stabilizing second layer (3) in an elastically extensible second polymeric material covering the reinforcement (2) for defining a corrugated single tubular body (4) with the first layer (1), a coating third layer (5) placed on the second layer (3) for covering the corrugated single tubular body (4).

Abstract: A flexible hose with knitted reinforcement has at least one inner tubular layer made of polymer material defining a longitudinal axis and at least one knitted reinforcement layer wound on the inner layer and having at least a first and a second series of yarns spiral wound on the inner layer and knitted together to form respective mesh courses that are inclined with respect to the axis and respective mesh wales substantially parallel to the axis. The mesh wales of the first series of yarns are superimposed on the second series of yarns to define a single-layer reinforcement knitting. A manufacturing method is provided.

Abstract: A knitting head of a knitting machine for manufacturing flexible hoses (1) with a knitted reinforcement layer, which comprises a guide body (14) with a central tubular conduit (15) for the passage of the bearing layer (2) and having a outlet end portion (16) with a first outer peripheral surface (17) having a first predetermined radius (r1), a plurality of knitting needles (18) arranged along the periphery of said end portion (16) of said conduit (15) and having first longitudinal end sections (18?) arranged along the circumference of said outer peripheral surface (17) and second longitudinal end sections (18?) arranged over a second cylindrical surface (19) having a second radius (r2) greater than said first radius (r1), at least one disk-shaped cam element (22), which is adapted to rotate at a first rotation speed and has a third predetermined radius (r3).

Abstract: A knitting head of a knitting machine for manufacturing flexible hoses (1) with a knitted reinforcement layer, which comprises a guide body (14) with a central tubular conduit (15) for the passage of the bearing layer (2) and having a outlet end portion (16) with a first outer peripheral surface (17) having a first predetermined radius (r1), a plurality of knitting needles (18) arranged along the periphery of said end portion (16) of said conduit (15) and having first longitudinal end sections (18?) arranged along the circumference of said outer peripheral surface (17) and second longitudinal end sections (18?) arranged over a second cylindrical surface (19) having a second radius (r2) greater than said first radius (r1), at least one disk-shaped cam element (22), which is adapted to rotate at a first rotation speed and has a third predetermined radius (r3).

Abstract: A flexible hose with knitted reinforcement has at least one inner tubular layer made of polymer material defining a longitudinal axis and at least one knitted reinforcement layer wound on the inner layer and having at least a first and a second series of yarns spiral wound on the inner layer and knitted together to form respective mesh courses that are inclined with respect to the axis and respective mesh wales substantially parallel to the axis. The mesh wales of the first series of yarns are superimposed on the second series of yarns to define a single-layer reinforcement knitting. A manufacturing method is provided.