GB2142270A - Extruded flexible reinforced tubing - Google Patents

Extruded flexible reinforced tubing Download PDF

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Publication number
GB2142270A
GB2142270A GB08317442A GB8317442A GB2142270A GB 2142270 A GB2142270 A GB 2142270A GB 08317442 A GB08317442 A GB 08317442A GB 8317442 A GB8317442 A GB 8317442A GB 2142270 A GB2142270 A GB 2142270A
Authority
GB
United Kingdom
Prior art keywords
core
coating
extruder
threads
tubing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08317442A
Other versions
GB8317442D0 (en
Inventor
Brian J Copely
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COPELY DEV Ltd
Original Assignee
COPELY DEV Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by COPELY DEV Ltd filed Critical COPELY DEV Ltd
Priority to GB08317442A priority Critical patent/GB2142270A/en
Publication of GB8317442D0 publication Critical patent/GB8317442D0/en
Publication of GB2142270A publication Critical patent/GB2142270A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/60—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels
    • B29C53/62—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels rotatable about the winding axis
    • B29C53/64—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels rotatable about the winding axis and moving axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • B29C48/0016—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die using a plurality of extrusion dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces thereof
    • B29C48/153—Coating both inner and outer surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/005—Hoses, i.e. flexible

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

In apparatus and a method for manufacturing flexible tubing, a core supply i.e. an extruder or a storage reel, supplies a flexible tubular core (2) and reinforcing threads are wound round the core by a thread winding device. A plastics extruder (6) is arranged to extrude a tubular plastics coating on to the core and the threads and is adapted to permit a positive air pressure differential to be applied between the exterior and the interior of the coating during extrusion of the coating. A vacuum is applied between the coating and the core to draw the coating on to the core and the threads while the coating is still in a plastic state. The tubing requires less material for the same burst pressure and can be manufactured at high production speeds. <IMAGE>

Description

SPECIFICATION Flexible tubing This invention relates to an apparatus for and method of manufacturing flexible tubing, for example hoses for gases and liquids under pressure.
In our published European Patent Application No. 36 674 we have described the formation of plastics tubing in which a plastics coating is applied to a ridged or ribbed core having reinforcing threads wound thereon. The tubing so formed can withstand very high internal fluid pressures using much less material in their formation than conventional tubes of comparable internal diameter and burst resistance.
We have now found that a further improvement in the burst resistance of the hose and in the consistency of manufacture can be obtained by using a differential pressure to urge the outer coating into intimate contact with the core and the threads thereon.
Accordingly, the invention provides apparatus for manufacturing flexible tubing, comprising a core supply for supplying a flexible tubular core, a thread winding device for winding at least one reinforcing thread around the core, and a plastics extruder arranged to extrude a tubular plastics coating on to the core, the extruder being adapted to enable a positive air pressure differential to be applied between the exterior and the interior of the coating around the core during extruding of the coating.
Preferably, the exterior of the coating is at atmospheric pressure, and a vacuum is applied to the interior of the coating as it is extruded. The coating is suitably extruded as a tube uniformly spaced from the surface of the core, the vacuum drawing the coating down on to the core while the coating is still in a plastic state.
The core supply may be a reel, but is preferably another plastics extruder, continuously forming the core tubing, which is cooled in water before passing through the winding device.
The winding device is preferably arranged to apply a plurality of reinforcing threads, half the thread running in the opposiite direction to the other half.
The invention also provides a method of manufacturing flexible tubing, comprising winding at least one reinforcing thread around a flexible tubular core, passing the core with the thread or threads thereon through a plastics extruder and extruding a tubular plastics coating on to the core and the thread or threads, wherein a positive air pressure differential is created in the extruder during extruding between the exterior and the interior of the coating, whereby the coating is urged into intimate contact with the core and with the thread or threads.
The apparatus and method of the invention produce tubing having typically 1/3 less material than conventional tubing of the same general structure, internal diameter and burst pressure.
The amount of tubing which has to be discarded through bonding failure is substantially reduced, and higher production speeds can be achieved.
Reference is made to the drawings, in which: Figure 1 is a schematic diagram illustrating the layout of the apparatus of the invention; and Figure 2 is a sectional plan of an extruder forming part of the apparatus in according with an embodiment of the invention.
The apparatus illustrated by Fig. 1 consists of a first extruder 1 which is a conventional screw feed extruder receiving poly(vinyl chloride) (PVCj in the form of granules. The arrangement of the granule feed hopper and feed screw barrel is conventional and these parts are therefore not shown in detail, a part only of the barrel being shown. The granules are melted and the molten PVC is forced through an annular die to extrude a tubular core 2 having an external surface consisting of longitudinal ridges and valleys of generally triangular configuration, around the tube. The core 2 is extruded at a temperature of about 140-1 50 C and at a linear speed of about 2000 ft/hr (170 mm/s), and passes through a cooling bath 3 containing a flow of cooling water.The cooling bath 3 cools the core 2 to about 70"C before it reaches the winding device 4 for the reinforcing threads. The winding device 4 consists of two contra-rotating drums 4a and 4b, each containing a plurality of reels 5 of polyester yarn of 1 100 decitex gauge. The reels are arranged to feed the yarn to the core under a very light tension and spaced apart so as to produce a braided effect, the yarns crossing but leaving generally diamond-shaped spaces therebetween.
The core with the reinforcing yarns thereon passes from the winding device 4 into a second extruder 6 of similar general configuration to the first extruder 1. The coating material is also suitably PVC and is supplied to an annular die which is described hereinafter in more detail with reference to Fig. 2. A vacuum pump 7 is connected to the extruder 6 by means of a vacuum pipe 8. The coated tube passes through a second cooling bath 9 whose length, and coolant flow rate and the temperature are selected to reduce the temperature of the coating from the 140"-150"C extrusion temperature to a suitable temperature to permit manual handling of the tube, for example forming into rolls, e.g. on a reel 10.
In a first alternative embodiment, the coated tubing passes from the second extruder 6 through cooled nip rollers which flatten the tubing into a ribbon-like form which may be returned to a tubular form by internal fluid pressure. Such flattened tubing may be used as hosepipe, being self-draining, by virtue of the elastic "memory" of the material for the ribbonlike form, more easily formed into a roll, and occupying less space for storage, than conventional round tubing.
In a second alternative embodiment, the coated tubing from the second extruder 6 passes through a cooling bath which brings the temperature down to about 70 C, then to a second winding device identical to the first winding device 4, where a second set of reinforcing yarns is applied, and from there to a third extruder, of a generally identical construction to the second extruder 6, where a final outer coating is applied, again of thin PVC. Tubing produced in this manner is suitable for very high pressure applications, with operating pressures, for example for a 10 mm internal diameter tube, in excess of 60 bar at + 20 C.
Referring to Fig. 2, the extruder comprises an elongate screw 20 which drives the molten PVC coating material into the extruding head 21. The head 21 comprises a two-part extruding tool 22, having an outer part 22a containing a frusto-conical bore 22b therethrough, and a generally frusto-conical inner part 22cwhose conical surface contains an angle smaller than that contained by the surface of the bore 22b. The inner part 22c has a cylindrical bore 22d therethrough, the diameter of which is larger than the external diameter of the core 2 with the yarns wound on to the surface thereof, so that the prevailing gas pressure at the rear face 22e of the inner part 22c is substantially the same as that at the opposite end of the bore 22d.
The rear face 22e is attached to one end of a tubular vacuum chamber 23 which is in turn attached to an adjusting ring 24 which is externally screw-threaded and screws into a correspondingly-threaded socket 25 in the body of the extruding head 21. Rotation of the adjusting ring 24 thus moves the inner part 22c of the extruding tool relative to the outer part 22a, which in turn alters the thickness of the coating extruded.
A vacuum connector piece 26 exteds axially from the adjusting ring 24 and has a bore 27 therethrough which communicates with the interior of the vacuum chamber 23 and with a vacuum tube 28 which is connected by a flexible hose 8 to a vacuum pump 7 (see Fig. 1). An inlet tube 29, having a PTFE tube guide and sealing bush 30 in the end thereof extends axially from the connector piece 26 and the interior of the tube communicates with the interior of the connector piece 26.
The bush 30 makes sealing contact with the core as it enters the inlet tube 29 and passes through the vacuum chamber to the extruding tool thus maintaining the vacuum.
The PVC coating material delivered to the extruded head 21 by the screw 20 passes into an annular space 31 surrounding the vacuum chamber 23 and from there into the space between the inner and outer parts 22c and 22a of the extruding tool. The material is extruded at a rate such that it flows out of the annular gap at the outlet of the extruding tool 22 at substantially the same speed as that at which the core 2 passes through the extruder, typically 170 mm/s.
The vacuum in the vacuum chamber is communicated to the inside of the coating at the point of extrusion. The coating is extruded substantially parallel to the core and the vacuum, of the order of 20 to 40 inch water gauge, draws the coating into intimate contact with the core and with the yarn wound on to the core. The coating thickness, after being drawn on to the core, is less than the thickness of the core, and the texture of the braided yarn may be felt and may also be seen after coating.
EXAMPLE A flat hose was produced in accordance with the method described hereinabove with reference to Fig. 1 as the first alternative embodiment. The internal diameter of the tube before passage through the nip rollers was 12 mm. The nominal overall wall thickness was 2 mm, with the height of the ridges, relative to the valleys, being 0.58 mm. The outer coating thickness was approximately 1 mm relative to the valleys. The overall weight of the hose was 93 g/m.
Samples of the tube were tested for burst pressure by applying gradually increasing hydrostatic pressure to a sealed section of the tube. The minimum burst pressure out of a number of samples was found to be 450 p.s.i.g. (3.1 MNm-2) and burst pressures were generally in excess of 500 p.s.i.g. (3.45 MNm-2).
COMPARATIVE EXAMPLE 1 Round hoses were prepared in accordance with the main method hereinbefore described with reference to Figs. 1 and 2. Hoses of exactly the same nominal dimensions were produced by a similar process, but without the application of vacuum. Each hose was tested for burst pressure as in the Example hereinbefore.
The results were as follows: TABLE 1 BURST PRESSURE (at 20 C) (psig) COATING COATING Nominal Internal WITHOUT WITH Diameter (mm) VACUUM VACUUM 6 1190 1300 10 1160 1250 12 790 850 19 575 625 COMPARATIVE EXAMPLE 2 Hoses were produced using the methods as in Comparative Example 1, but in the case of the hoses coated without application of vacuum the coating thickness was such that the burst pressures of the hoses coated with and without vacuum were generally the same. The resulting weights of the hoses for a unit length were compared, and Table 2 gives the result.
WEIGHT (g/m) COATING COATING Nominal Internal WITHOUT WITH Diameter (mm) VACUUM VACUUM 6 90.8 54 10 165 95 12 223 126 19 334 258 COMPARATIVE EXAMPLE 3 A hose manufactured in accordance with the method hereinbefore described with reference to Figs. 1 and 2 was tested to compare the strength of bonding between the coating and the core with a conventional gas hose having a similar general construction, but a smooth core tube and coating applied without vacuum. The hoses were both high pressure gas hoses of 10 mm internal diameter.
300 mm lengths of each type of hose were used as test specimens. A hypodermic needle was inserted at one end of the hose at the junction between the coating and the core. The hose was plugged and secured with hose clips, the needle extending beyond the clip at one end. Each sample was immersed in water during the test, and air was supplied under pressure to the hypodermic needle.
Samples in accordance with the invention were pressurised for 20 hours at 50 p.s.i.g. (343 kNm-2), and for one hour at 60 p.s.i.g. (414 kNm-2) ad 80 p.s.i.g. (552 kNm-2), and no leak was detected at the end of this time.
A sample of the conventional hose showed air leaks from both ends, from between the layers, after only a few minutes at a pressure of 10 p.s.i.g. (69 kNm-2).

Claims (9)

1. Apparatus for manufacturing flexible tubing, comprising a core supply for supplying a flexible tubular core, a thread winding device for winding at least one reinforcing thread around the core, and a plastics extruder arranged to extrude a tubular plastics coating on to the core, the extruder being adapted to enable a positive air pressure differential to be applied between the exterior and the interior of the coating around the core during extruding of the coating.
2. Apparatus according to Claim 1, wherein the exterior of the coating is at atmospheric pressure, and a vacuum is applied to the interior of the coating as it is extruded.
3. Apparatus according to Claim 2, wherein the coating is extruded as a tube uniformly spaced from the surface of the core, the vacuum serving to draw the coating down on to the core while the coating is still in a plastic state.
4. Apparatus according to Claim 1, 2 or 3, wherein the core supply is another plastic extruder continuously forming the core tubing.
5. Apparatus according to any preceding claim, wherein the winding device is arranged to apply a plurality of reinforcing threads, half the threads running in the opposite direction to the other half.
6. Apparatus for manufacturing flexible tubing, substantially as described with reference to, or as shown in, the drawings.
7. A method of manufacturing flexible tubing, comprising winding at least one reinforcing thread around a flexible tubular core, passing the core with the thread or threads thereon through a plastics extruder and extruding the tubular plastics coating on to the core and the thread or threads, wherein a positive air pressure differential is created in the extruder during extruding between the exterior and the interior of the coating, whereby the coating is urged into intimate contact with the core and with the thread or threads.
8. A method according to Claim 7, which comprises applying a vacuum to the space between the core and the coating.
9. A method of manufacturing tubing, substantially as described herein.
GB08317442A 1983-06-28 1983-06-28 Extruded flexible reinforced tubing Withdrawn GB2142270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08317442A GB2142270A (en) 1983-06-28 1983-06-28 Extruded flexible reinforced tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08317442A GB2142270A (en) 1983-06-28 1983-06-28 Extruded flexible reinforced tubing

Publications (2)

Publication Number Publication Date
GB8317442D0 GB8317442D0 (en) 1983-08-03
GB2142270A true GB2142270A (en) 1985-01-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609931A1 (en) * 1987-01-23 1988-07-29 Tokai Rubber Ind Ltd METHOD AND APPARATUS FOR THE EXTRUSION MANUFACTURE OF A FIBER-FIBER RUBBER PIPE
GB2280870A (en) * 1993-08-13 1995-02-15 Boreflex Ind Supplies Ltd Coating for a hose
EP1270177A2 (en) * 2001-06-19 2003-01-02 Hyung Ki Kim Apparatus for manufacturing a resin tube with multiple inner conduits
WO2012168671A1 (en) * 2011-06-09 2012-12-13 Technip France Assembly and method for manufacturing a tubular sheath
US10744696B2 (en) 2017-02-17 2020-08-18 Fermatex Vascular Technologies, Llc Reinforced coreless tube extrusion systems and methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863303A (en) * 1959-02-12 1961-03-22 Us Rubber Co Improvements in continuous extrusion and cure of braided hose
GB958228A (en) * 1959-10-23 1964-05-21 Polymer Corp Polyamide articles
GB1168128A (en) * 1966-09-30 1969-10-22 Int Standard Electric Corp Power Cable
GB1210182A (en) * 1968-07-29 1970-10-28 Angus George Co Ltd Improvements in the manufacture of flexible hose pipes
GB1303803A (en) * 1969-01-22 1973-01-24
GB1375016A (en) * 1970-11-13 1974-11-27

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863303A (en) * 1959-02-12 1961-03-22 Us Rubber Co Improvements in continuous extrusion and cure of braided hose
GB958228A (en) * 1959-10-23 1964-05-21 Polymer Corp Polyamide articles
GB1168128A (en) * 1966-09-30 1969-10-22 Int Standard Electric Corp Power Cable
GB1210182A (en) * 1968-07-29 1970-10-28 Angus George Co Ltd Improvements in the manufacture of flexible hose pipes
GB1303803A (en) * 1969-01-22 1973-01-24
GB1375016A (en) * 1970-11-13 1974-11-27

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609931A1 (en) * 1987-01-23 1988-07-29 Tokai Rubber Ind Ltd METHOD AND APPARATUS FOR THE EXTRUSION MANUFACTURE OF A FIBER-FIBER RUBBER PIPE
GB2280870A (en) * 1993-08-13 1995-02-15 Boreflex Ind Supplies Ltd Coating for a hose
EP1270177A2 (en) * 2001-06-19 2003-01-02 Hyung Ki Kim Apparatus for manufacturing a resin tube with multiple inner conduits
EP1270177A3 (en) * 2001-06-19 2003-09-24 Hyung Ki Kim Apparatus for manufacturing a resin tube with multiple inner conduits
WO2012168671A1 (en) * 2011-06-09 2012-12-13 Technip France Assembly and method for manufacturing a tubular sheath
FR2976210A1 (en) * 2011-06-09 2012-12-14 Technip France ASSEMBLY AND METHOD FOR MANUFACTURING A TUBULAR SHEATH
US10744696B2 (en) 2017-02-17 2020-08-18 Fermatex Vascular Technologies, Llc Reinforced coreless tube extrusion systems and methods

Also Published As

Publication number Publication date
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