GB2032042A - Method of providing a lining - Google Patents
Method of providing a lining Download PDFInfo
- Publication number
- GB2032042A GB2032042A GB7931019A GB7931019A GB2032042A GB 2032042 A GB2032042 A GB 2032042A GB 7931019 A GB7931019 A GB 7931019A GB 7931019 A GB7931019 A GB 7931019A GB 2032042 A GB2032042 A GB 2032042A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheath
- adhesive
- lining
- lined
- pipe
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 7
- 230000000750 progressive effect Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 10
- 239000004800 polyvinyl chloride Substances 0.000 claims description 10
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 10
- 239000002654 heat shrinkable material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- -1 for example Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0014—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping tubes or blown tubular films
- B29C67/0018—Turning tubes inside out
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0047—Preventing air-inclusions
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
- B29C63/185—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings by turning inside-out or by derolling
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
- B29C63/20—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings using pressure difference, e.g. vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
In a method of producing an external lining on an elongate object, such as a pipe 10, a tubular flexible sheath 11 of thermoplastic material is closed at one end and inflated and the object to be lined is moved axially relative to the sheath, so that the sheath is turned inside out and is rolled onto the exterior surface of the object. The assembly may be heated in an axially progressive manner whereby an annular bubble of air entrapped between the sheath and the object is expelled. An adhesive may be used which is activated at a temperature higher than the temperature used to expel the air. <IMAGE>
Description
SPECIFICATION
Method of providing a lining
The present invention relates to a method of providing an exterior lining to an elongate object.
Various methods have been proposed for lining a metal or similar object with a plastic material.
However, these methods are all generally rather complex.
One particular method involves applying to the outside of the elongate object a tube of heat shrinkable material and heating the assembly so that the tube shrinks onto the object. This is reasonably satisfactory, but the heat shrinkable material is relatively expensive.
It is now proposed to provide a method of producing an external lining on an elongate object, such method comprising forming a tubular flexible sheath of thermoplastic material, closing one end of the sheath, inflating the sheath and moving the object to be lined axially relative to the sheath so that the sheath is turned inside out and is rolled onto the exterior surface of the object.
In many cases this arrangement would be sufficient to provide the external lining by itself.
However, it is also contemplated that heat can be applied in an axially progressive manner along the length of the thus lined object whereby the air entrapped between the sheath and the object is formed into an annular moving bubble, thus expelling the air.
The method according ot the invention can employ relatively inexpensive lining materials, for example, PVC. Such a material does not have to be pretreated to make it heat shrinkable as in the previously suggested method.
If desired, an adhesive can be applied to the sheath and/or to the object, this adhesive being sandwiched between the sheath and the object and desirably the adhesive is heat-activated adhesive which remains non-tacky until a temperature above that which is applied to expel the air, the final sealing of the sheath to the object being achieved by heating the lined object to a temperature sufficiently high to activate the adhesive.
Advantageously, the sheath is mounted in a guide tube during the relative axial movement of the sheath with respect to the object.
The method of the invention can be applied to lining the exterior surface of a solid object, but also can be applied to the lining of the external surface of a pipe, the interior surface of which can be lined by any suitable means.
In order that the invention may more readily be understood, the following description is given, merely by way of example, reference being made to the accompanying drawing in which:~
Figs. 1, 2 and 3 are three schematic views illustrating various stages in carrying out the method of the invention.
In the embodiment illustrated, a pipe 10 (Fig. 2) is to be provided with an external lining. The lining material is formed into a sheath 1 1, which is secured to a cylinder 12 at one end and is closed at the other end 13. Thereafter, the sheath is passed into a guide tube 16 and the cylinder 12 is fitted into an inflation box 18. Air, or other gas or vapour, is introduced into the cylinder as indicated by the arrow 14 so that the sheath 1 1 becomes inflated against the internal surface of the guide tube 16, so that it has an external diameter greater than the external diameter of the pipe 10 to be lined. The sheath is preferably constructed of a thermoplastic material such as PVC.
With the assembly thus arranged the pipe 10 is moved in the direction of the arrow 1 5 so that it is pushed into the closed end of the sheath.
The sheath is then cut at each end and the lined pipe extracted as shown in Fig. 3.
The PVC is held against the pipe by the resistance of the PVC. An adhesive could also be used to supplement these forces and also to prevent surface damage. Furthermore, if it is adhesively bonded the pipe can be cut at any point along its length.
Advantageously, the adhesive is one which does not become tacky until its temperature is raised above a particular threshold value. If a source of heat is moved along the thus preliminarily lined tube, then it will drive an annular bubble of air from one end of the pipe to the other, thus expelling the air, and ensuring intimate contact between the pipe and sheath. If a further annular source of heat is then passed along having a temperature sufficiently high to activate the adhesive, then a firm bond can be achieved between the sheath and the pipe. Alternatively the adhesive can be activated by placing the assembly in an oven.
While the concept of expelling the air is advantageous, as is the use of an adhesive, it is not essential.
The method of the present invention can be used for any elongate object and it is of little consequence as to whether the object is of cur, ocular or of non-circular cross-section. It is much more readily possible, with the method of the invention, as compared with prior known methods, to coat a non-circular cross-section object.
The method of invention is much cheaper than that using a heat shrinkable material, because polyvinyl chloride or other relatively cheap plastics material can be used.
1. A method of producing an external lining ort an elongate object, such method comprising the steps of forming a tubular flexible sheath of thermoplastic material, closing one end of the sheath, inflating the sheath and moving the object to be lined axially relative to the sheath, so that the sheath is turned inside out and is rolled onto the exterior surface of the object.
2. A method according to Claim 1, wherein heat is applied in an axially progressive manner along the length of the thus lined object, whereby the air entrapped between the sheath and the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A method of producing an external lining ort an elongate object, such method comprising the steps of forming a tubular flexible sheath of thermoplastic material, closing one end of the sheath, inflating the sheath and moving the object to be lined axially relative to the sheath, so that the sheath is turned inside out and is rolled onto the exterior surface of the object.
2. A method according to Claim 1, wherein heat is applied in an axially progressive manner along the length of the thus lined object, whereby the air entrapped between the sheath and the object. is formed into an annular moving bubble, thus expelling the air.
3. A method according to Claim 1 or 2, wherein an adhesive is applied to the sheath and/or to the object, whereby the adhesive is sandwiched between the sheath and the object during the axial movement of the sheath relative to the object.
4. A method according to Claim 2 and 3, wherein the adhesive is a heat activated adhesive which remains non-tacky until a temperature above that which is applied to expel the air, and wherein the final sealing of the sheath to the object is achieved by heating the lined object to a temperature sufficiently high to activate the adhesive.
5. A method according to any preceding claim, wherein the sheath is mounted in a guide tube during the relative axial movement of the sheath with respect to the object.
6. A method according to any preceding claim, wherein the object is of non-circular crosssection.
7. A method of producing an external lining on an elongate object substantially as hereinbefore described, with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7836596 | 1978-09-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2032042A true GB2032042A (en) | 1980-04-30 |
| GB2032042B GB2032042B (en) | 1982-10-27 |
Family
ID=10499627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7931019A Expired GB2032042B (en) | 1978-09-13 | 1979-09-07 | Method of providing a lining |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2032042B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0053445A1 (en) * | 1980-11-24 | 1982-06-09 | AMP INCORPORATED (a New Jersey corporation) | Conformable sheathing means |
| GB2181208B (en) * | 1984-10-17 | 1989-05-17 | Trest Juzhvodoprovod | Method of protecting the internal surface of a pipeline against corrosion,and apparatus for carrying out the method |
-
1979
- 1979-09-07 GB GB7931019A patent/GB2032042B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0053445A1 (en) * | 1980-11-24 | 1982-06-09 | AMP INCORPORATED (a New Jersey corporation) | Conformable sheathing means |
| GB2181208B (en) * | 1984-10-17 | 1989-05-17 | Trest Juzhvodoprovod | Method of protecting the internal surface of a pipeline against corrosion,and apparatus for carrying out the method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2032042B (en) | 1982-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |