GB1584616A - Flexible thermoplastic hose - Google Patents
Flexible thermoplastic hose Download PDFInfo
- Publication number
- GB1584616A GB1584616A GB23030/77A GB2303077A GB1584616A GB 1584616 A GB1584616 A GB 1584616A GB 23030/77 A GB23030/77 A GB 23030/77A GB 2303077 A GB2303077 A GB 2303077A GB 1584616 A GB1584616 A GB 1584616A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- hose
- reinforcement
- thermoplastic
- heated
- 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.)
- Expired
Links
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
- 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
- B29C48/03—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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO FLEXIBLE
THERMOPLASTIC HOSE
(71) We, BTR INDUSTRIES LIMITED, a
British Company, of Silvertown House, Vincent
Square, London SW1P 2PL, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to reinforced flexible pressure hose of thermoplastic material.
According to the invention there is provided a method of manufacturing reinforced flexible thermoplastic hose comprising the steps of extruding a thermoplastic tube, applying a positive, predetermined pressure difference between the inside and outside of the tube, and applying to the tube reinforcing elements under tension, in which the reinforcing elements are heated prior to application to the tube to such a temperature that the reinforcing elements soften the exterior of the tube and the tension applied to the elements in combination with the pressure difference across the tube causes the elements to penetrate the tube, the pressure difference being maintained while the reinforced assembly is allowed to cool whereby the reinforcing elements are
secured to the thermoplastic tube.
The pressure difference is preferably
removed after cooling below the hardening
temperature of the tube.
The positive pressure difference between
the inside and the outside of the tube may be
created by sealing one end of the tube and
filling the tube with fluid (for example water)
under pressure.
The fluid may be removed from the tube by
applying compressed air to the tube.
An outer cover of thermoplastic material
may be applied to the completed tube.
Alternatively, the initial external diameter
of the hose may be greater than the desired
final external diameter of the reinforcement,
such that when the heated reinforcing elements
are applied, the outer diameter of the hose is
greater than the external diameter of the re
inforcement, the reinforced hose being passed
through heated smoothing means to smooth
the exterior surface of the tube, and the pressure difference between the inside and the outside of the hose removed, whereby an integrated cover and final hose is formed.
The invention further provides a reinforced hose manufactured by the method as described above.
By way of example, a specific method of manufacturing reinforced thermoplastic hose and a modification thereto will now be described with reference to and as shown in the accompanying drawings, in which:
Figure 1 is a diagrammatic view to illustrate a method of manufacturing thermoplastic hose, and
Figure 2 is a diagrammatic view to illustrate a modified method of manufacturing thermoplastic hose.
The first step of the preferred embodiment of the method according to the invention is to extrude a thermoplastic tube, and such an extruded thermoplastic tube 10 is shown extending from a coil 19 in Figure 1. The tube is then filled with fluid, for example water, and
the leading end of the tube is sealed, the other
end of the tube being connected to a pressure
source and gauge, shown generally at 11.
The interior of the tube is pressurised to a
predetermined pressure, the pressure being
determined by the exact dimension of the
inside diameter of the tube and the outside
diameter required for the reinforcement, and
the calculation of the pressure is also dependent
on the tensions in the reinforcement which are
to be applied to the outside of the tube. The
pressure can be regulated during the reinforce
ment process so that precise diametral control
of bore and reinforcement outer diameter is
permitted.
The reinforcement machine is shown
generally at 12. The reinforcement may be
braided or spirally wound, and is heated
externally of the tube 10 in a gas flame,
although it will be appreciated that other
forms of heating could be used. The heated
reinforcement is then applied to the exterior
surface of the tube such that the exterior
surface of the tube is softened while the
interior surface of the tube remains solid due to the presence of the cool pressurising fluid.
The application of the reinforcement forces the reinforcement into the soft exterior of the tube, thus effectively filling the underside of interstices of the reinforcement and creating a homogenous matrix.
After the reinforcement has been applied, the fluid is removed from the tube by blowing out with compressed air, although other methods of removal could be used. The tube is now secured to the reinforcement, and the final step is to cover the tube with a thermoplastic covering, thereby completely enclosing the reinforcement. An outer cover can also be applied using conventional polymers and microwave techniques.
In Figure 2, a modified method of manufacturing reinforced thermoplastic tubes is shown. In the modified method, the tube 10 is extruded thicker than in the method described with reference to Figure 1, with the result that when the reinforcement is applied the outer
diameter of the tube extends beyond the outer diameter of the reinforcement, the heated reinforcement being effectively submerged in the tube.
The tube with reinforcement applied passes over a haul-off conveyor 13, through a heating station 14 and through a heated sizing die 15 which smoothes the outer surface of the tube
to form an integrated cover and final hose. The hose then passes over a second haul-off conveyor 16, through a line marking station 17 and is finally wound onto a drum 18.
One advantage of this embodiment of a method of manufacturing reinforced hose, and the modification thereto, is that it permits manufacture of a hose using a thin walled thermoplastic tube whereby accurate braid and bore tolerances can be achieved. A homogenous tubelreinforcement matrix is produced which is advantageous since rosetting of the reinforcement is reduced, as
is distortion of reinforcement helix angle during fitting of the hose to a coupling.
The use of a fluid as the cooling medium for
the interior of the tube protects the innermost portion of the tube from distortion upon application of the heated reinforcement, thereby maintaining a smooth interior surface.
WHAT WE CLAIM IS:
1. A method of manufacturing reinforced flexible thermoplastic hose comprising the steps of extruding a thermoplastic tube, apply
ing a positive, predetermined pressure differ
ence between the inside and outside of the
tube, and applying to the tube reinforcing
elements under tension, in which the re
inforcing elements are heated prior to appli
cation to the tube to such a temperature that the reinforcing elements soften the exterior of the tube and the tension applied to the elements in combination with the pressure difference across the tube causes the elements to penetrate the tube, the pressure difference being maintained while the reinforced assembly is allowed to cool whereby the reinforcing elements are secured to the thermoplastic tube.
2. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 1 wherein the pressure difference is removed after cooling below the hardening temperature of the tube.
3. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 1 or claim 2 wherein the positive pressure difference between the inside and the outside of the tube is created by sealing one end of the tube and filling the tube with fluid under pressure.
4. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 3 wherein the fluid may be removed from the tube by applying compressed air to the tube.
5. A method of manufacturing reinforced flexible thermoplastic hose as claimed in any preceding claim comprising the further step of applying an outer cover of thermoplastic material to the completed tube.
6. A method of manufacturing reinforced flexible thermoplastic hose as claimed in any of claims 1 to 4 wherein the initial external diameter of the hose is greater than the desired final external diameter of the reinforcement, such that when the heated reinforcing elements are applied the outer diameter of the hose is greater than the external diameter of the reinforcement, the reinforced hose being passed through heated smoothing means to smooth the exterior surface of the tube, and the pressure difference between the inside and the outside of the hose being removed after smoothing whereby an integrated cover and final hose is formed.
7. A method of manufacturing reinforced flexible thermoplastic hose substantially as hereinbefore described with reference to
Figure 1 or modified as hereinbefore described with reference to Figure 2 of the accompanying drawings.
8. A reinforced hose manufactured by a method as claimed in any preceding claim.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A method of manufacturing reinforced flexible thermoplastic hose comprising the steps of extruding a thermoplastic tube, apply
ing a positive, predetermined pressure differ
ence between the inside and outside of the
tube, and applying to the tube reinforcing
elements under tension, in which the re
inforcing elements are heated prior to appli
cation to the tube to such a temperature that the reinforcing elements soften the exterior of the tube and the tension applied to the elements in combination with the pressure difference across the tube causes the elements to penetrate the tube, the pressure difference being maintained while the reinforced assembly is allowed to cool whereby the reinforcing elements are secured to the thermoplastic tube.
2. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 1 wherein the pressure difference is removed after cooling below the hardening temperature of the tube.
3. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 1 or claim 2 wherein the positive pressure difference between the inside and the outside of the tube is created by sealing one end of the tube and filling the tube with fluid under pressure.
4. A method of manufacturing reinforced flexible thermoplastic hose as claimed in claim 3 wherein the fluid may be removed from the tube by applying compressed air to the tube.
5. A method of manufacturing reinforced flexible thermoplastic hose as claimed in any preceding claim comprising the further step of applying an outer cover of thermoplastic material to the completed tube.
6. A method of manufacturing reinforced flexible thermoplastic hose as claimed in any of claims 1 to 4 wherein the initial external diameter of the hose is greater than the desired final external diameter of the reinforcement, such that when the heated reinforcing elements are applied the outer diameter of the hose is greater than the external diameter of the reinforcement, the reinforced hose being passed through heated smoothing means to smooth the exterior surface of the tube, and the pressure difference between the inside and the outside of the hose being removed after smoothing whereby an integrated cover and final hose is formed.
7. A method of manufacturing reinforced flexible thermoplastic hose substantially as hereinbefore described with reference to
Figure 1 or modified as hereinbefore described with reference to Figure 2 of the accompanying drawings.
8. A reinforced hose manufactured by a method as claimed in any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB23030/77A GB1584616A (en) | 1978-05-26 | 1978-05-26 | Flexible thermoplastic hose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB23030/77A GB1584616A (en) | 1978-05-26 | 1978-05-26 | Flexible thermoplastic hose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1584616A true GB1584616A (en) | 1981-02-18 |
Family
ID=10188983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23030/77A Expired GB1584616A (en) | 1978-05-26 | 1978-05-26 | Flexible thermoplastic hose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1584616A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764324A (en) * | 1983-12-12 | 1988-08-16 | Warren Burnham | Method of making a catheter |
| US5335410A (en) * | 1993-03-15 | 1994-08-09 | Burnham Warren R | Method of making ultra small diameter catheters and of reinforced tubular product |
| US5792401A (en) * | 1983-12-12 | 1998-08-11 | Burnham; Warren R. | Method for making a tubular product |
-
1978
- 1978-05-26 GB GB23030/77A patent/GB1584616A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764324A (en) * | 1983-12-12 | 1988-08-16 | Warren Burnham | Method of making a catheter |
| US5792401A (en) * | 1983-12-12 | 1998-08-11 | Burnham; Warren R. | Method for making a tubular product |
| WO1990001406A1 (en) * | 1986-03-31 | 1990-02-22 | Burnham Warren R | Method of making a catheter or tube |
| US5335410A (en) * | 1993-03-15 | 1994-08-09 | Burnham Warren R | Method of making ultra small diameter catheters and of reinforced tubular product |
| WO1994021420A1 (en) * | 1993-03-15 | 1994-09-29 | Burnham Warren R | Method and apparatus for small catheters and reinforced tubular product |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |