US 4,362,488 AGranted

Extruder for continuous manufacture of reinforced tubing, especially hose

OwnerRamon R. Casals, Jaime R. Casalsinventors

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Abstract

An extruder for continuously manufacturing reinforced fluid-impermeable tubing, especially hose, mainly comprises an elongated extruder head formed from an inner, an intermediate and an outer tubular member arranged concentric with each other and constructed to define between the inner and the intermediate tubular members a first annular passage having an outlet end communicating at an opposite end thereof with a first hopper, and to define between the intermediate and the outer tubular member a second annular passage communicating with a second hopper. A mandrel concentric with the inner tubular member forms a gap with the latter through which a tubular reinforcing fabric is guided. The mandrel is provided with an annular neck which overlaps at least partly the outlet end of the first annular passage; which is rearwardly displaced from the outlet end of the second annular passage so that compounded polymeric material passing from the first hopper to the outlet end of the first annular passage may pass through a portion of the tubular fabric reinforcement not yet covered at its outer surface to form an inner layer of the reinforced tubing, while the material passing from the second hopper to the outlet end of the second annular passage will form the outer layer of the reinforced tubing.

An extruder for continuously manufacturing of reinforced tubing, especially hose, consisting of a tubular fabric reinforcement, an outer tubular layer of compounded polymeric material applied to and bonded to the outer surface of the tubular fabric reinforcement and an inner tubular layer of compounded polymeric material applied to and bonded to the inner surface of the tubular fabric reinforcement, said extruder comprising an elongated extruder head having a plurality of tubular means arranged to form two main annular passages extending in longitudinal direction of the head and each having an inlet end and an outlet end, one of said main annular passages being at least in part surrounded by the other main annular passage, said one annular passage serving for the flow of compounded polymeric material therethrough forming said inner tubular layer and the other of said annular passages serving for the flow of compounded polymeric material therethrough forming said outer tubular layer, said outlet end of said one annular passage being rearwardly displaced, as considered in the direction of flow of the compounded polymeric material, from the outlet end of said other annular passage;

a first hopper communicating with the inlet end of said one annular passage for feeding compounded polymeric material for forming said inner tubular layer into said one annular passage;
a second hopper communicating with the inlet end of said other annular passage for feeding compounded polymeric material for forming said outer tubular layer into said other annular passage;
said extruder head being further provided with a central passage of circular cross section therethrough;
and a mandrel of circular cross section of a diameter smaller than that of said central passage extending coaxially through said central passage to form an annular gap with the latter for feeding the tubular fabric reinforcement through said annular gap, said outlet end of said one annular passage and said outlet end of said other annular passage terminate both at the outer periphery of said annular gap, said mandrel being provided in the region of the outlet end of said one annular passage with an annular neck at least partly overlapping said outlet end of said one annular passage.

1 more element

Facts

Application

06/243,060Filed 9 Mar 1981

Priority

ES 489.43912 Mar 1980

Granted

7 Dec 1982

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

B29C 48/34
With annular openings, e.g. for forming tubular articles: cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding…
B29C 48/0016
Producing hollow articles having components brought in contact outside the extrusion die: using a plurality of extrusion dies
B29C 48/09
Characterised by the shape of the extruded material at extrusion: articles with cross-sections having partially or fully enclosed cavities, e.g.…
B29C 48/10
Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels: flexible, e.g. blown foils

Abstract

Claims6