WO1981003145A1 - Articles tubulaires de thermoformage - Google Patents

Articles tubulaires de thermoformage Download PDF

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Publication number
WO1981003145A1
WO1981003145A1 PCT/GB1980/000080 GB8000080W WO8103145A1 WO 1981003145 A1 WO1981003145 A1 WO 1981003145A1 GB 8000080 W GB8000080 W GB 8000080W WO 8103145 A1 WO8103145 A1 WO 8103145A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
articles
oil
temperature
predetermined shape
Prior art date
Application number
PCT/GB1980/000080
Other languages
English (en)
Inventor
P Mitchell
Original Assignee
P Mitchell
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 P Mitchell filed Critical P Mitchell
Priority to PCT/GB1980/000080 priority Critical patent/WO1981003145A1/fr
Priority to JP50098580A priority patent/JPS57500729A/ja
Publication of WO1981003145A1 publication Critical patent/WO1981003145A1/fr

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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B29C2035/042—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water
    • B29C2035/043—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water oil
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2031/00—Use of polyvinylesters or derivatives thereof as moulding material
    • B29K2031/04—Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • 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
    • B29L2023/004—Bent tubes

Definitions

  • the invention relates to thermoforming articles and is more particularly concerned with methods of manufacturing articles having a predetermined shape or form and manufactured from heat mouldable tubular material.
  • thermoplastic tubular material can be bent with a bending die at suitable temperatures followed by cooling to set the material in the bent configuration.
  • Such a process suffers the disadvantage that the finished articles are lacking in thermal stability, i.e. when the service conditions result in the article being reheated to temperatures approaching the temperature at which they were initially bent there is a tendency for articles to resume the original shape or form of the tubular material.
  • the first of these methods comprises injection moulding in which the article is formed in an openable mould.
  • the mould comprises a casing and a core, the mould being designed so that the core can be removed from the moulded article. At some stage in such moulding, the mould is heated.
  • the article is shaped from material while the material is in a plastic or pliable state and then the shaped article is baked or at least heated in an autoclave or oven.
  • a method of annealing tubular articles of heat mouldable material comprising heating the articles to the annealing temperature for a time to effect the annealing thereof and cooling the articles to set by passing a fluid therethrough while the articles are restrained in the predetermined shape or form. On releasing the constraint on the finished article it remains in the predetermined shape or form and exhibits a high degree of thermal stability.
  • the invention also provides a method of manufacturing an article having a predetermined shape or form from a tube of heat mouldable material comprising bending the tube to the predetermined shape, heating the tube to the annealing temperature of the material by passing heated fluid through the tube, maintaining the flow of heated fluid for a period of time sufficient to anneal the tube and cooling the tube while still constrained in the bent shape.
  • the tube is cooled by flowing cooling fluid through the tube after the flow of heating fluid is terminated.
  • both fluids are the same substance.
  • a heated fluid can be flowed through the tube to heat the tube before bending to a temperature at which the tube is flexible enough to be fitted to a jig structure defining the predetermined shape or form.
  • the fluid which is flowed through the tube must have a boiling point higher than the desired process temperature and can conveniently be oil.
  • Suitable heat mouldable or thermoformable materials are polyethylene, vinyl polymers such as polyvinyl chloride, polyvinyl acetate or polyamides.
  • the tubular blank can, for example, comprise a tube and can be shaped either by winding it onto a former to form a coil or by threading it onto or fixing it to a jig or like support structure.
  • Figure 1 is a diagrammatic drawing of apparatus for carrying out a first embodiment of the invention
  • Figure 2 is a diagrammatic drawing of an article manufactured in a second embodiment.
  • the manufacture to be described with reference to Figure 1 is usable to form a coil of tubular plastics material which coils are usable for coupling vacuum from a motor tractor to its trailer.
  • the initial tube is straight and flexible and is wound into a coil 11 on a rigid, in this example wooden, cylindrical former 12.
  • the tube is formed of nylon hose, having an internal diameter of about 1 cm and a wall thickness of about 0.1 cms.
  • the former is about 12 to 15 cms. in diameter and about 60-75 cms long.
  • the former is detachably and rotatably mounted in a suitable frame (not shown).
  • the tube is wound as a coil onto the former either while the former is detached from its mounting frame or by rotating the former in its frame and feeding the tube onto the rotating former.
  • the former may be helically grooved to receive the tube.
  • the rigidity of the wall of the tube is such that the bore remains substantially constant and the tube does not flatten.
  • a feed conduit 13 to a liquid pump 14 connected via a three-way valve V1 to a hot oil reservoir 16.
  • the oil in the reservoir is Shell Clavus 25.
  • An immersion heater is used in this example to heat the oil to a temperature of 150°C.
  • Oil is returned to the reservoir 16 by a return conduit 17 including a second three-way valve V2.
  • a second inlet of the supply valve V1 is connected to the outlet of a cold oil reservoir 21 and a second outlet of the return valve 72 is connected to the inlet of the reservoir 21.
  • the cold oil is at room temperature but can be cooled to a lower temperature.
  • the pump After winding the coil and connecting up the conduits, the pump is switched on and hot oil flowed through the coil. The flow is maintained for about four minutes with the reservoir oil temperature at about 150°C.
  • the valves V1 and V2 are then adjusted to change the oil flow from hot oil to cold oil. The cold oil is allowed to flow for about four minutes.
  • the oil is then vented from the coil by setting the valve 14 to its third setting in which air is pumped into the coil. Finally,and if required, the oil in the coil can be scavenged, for example by admitting a blast of nitrogen from a high pressure source into the coil.
  • the former After cooling, and scavenging if desired, the former is removed from its mounting frame and taken out from the coil.
  • the coil retains its helical form.
  • the helical coil can be extended and compressed in the manner of a concertina. Suitable fittings can be swaged or otherwise secured to the ends of the coil tube to permit it to be connected in a fluid or vacuum circuit.
  • the coil is thermally stable.
  • the article is of relatively large size.
  • the article is usable, for example,in the air conditioning system of a vehicle and replaces a similar product which has hitherto often been assembled from discrete parts, at least some of which were metal.
  • the article is formed from what is commercially identified as "high pressure nylon hose".
  • Such hose is flexible in that it can be wound into relatively large diameter coils of, say for a 1.25 cm bore hose, 75-100 cms diameter.
  • the hose cannot be taken around small radius curves e.g. curves of say 5 to 10 cms radius.
  • the article comprises five consecutive sections 31 to 35 and is between 11 ⁇ 2 and 2 meters in length.
  • the sections are not all in the same plane and, in fact, in this example only sections 31, 32 are in the same plane.
  • the article is formed using a jig structure which provides a grooved path into which the hose can be fitted. This is done by first laying out the hose alongside the jig path and then flowing oil at a temperature of 100°C through the hose for two minutes. By this time the hose has reached a temperature at which the nylon wall is sufficiently flexible to permit the tube to be fitted into and secured in the jig path. The oil temperature is then raised to between 150°C and 170°C and caused to flow for a further four minutes.
  • the hose is connected in an oil flow circuit similar to that illustrated in Figure 1.
  • the oil flow is changed from hot oil to cold (room temperature) oil to cool the hose to set and then vented and, if required, scavenged.
  • a fluid other than oil eg a gas or waterwaybe passed through the tubular material.
  • the article can be moulded to have substantially any reasonable, required shape or form.
  • the two described articles retain the full bore through their length since collapse of the tube is prevented by the internal liquid pressure.
  • it is required to introduce a constriction this can be done when the tube is heated after bending.
  • an exterior fixing flat is required this can be moulded into the tube wall.
  • the ambient medium was atmospheric air. However there could be circumstances where a different medium, for example a liquid, is required.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Des articles tubulaires thermoformes sont fabriques a partir de flans tubulaires qui sont chauffes jusqu'a une temperature de recuit pendant un temps suffisamment long pour recuire les articles en faisant couler au travers un liquide chaud tout en etant contraints dans une forme desiree, puis l'on fait couler un liquide froid de refroidissement pour obtenir la prise de ces articles avant de les liberer de la contrainte.
PCT/GB1980/000080 1980-05-07 1980-05-07 Articles tubulaires de thermoformage WO1981003145A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB1980/000080 WO1981003145A1 (fr) 1980-05-07 1980-05-07 Articles tubulaires de thermoformage
JP50098580A JPS57500729A (fr) 1980-05-07 1980-05-07

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOGB80/00080 1980-05-07
PCT/GB1980/000080 WO1981003145A1 (fr) 1980-05-07 1980-05-07 Articles tubulaires de thermoformage

Publications (1)

Publication Number Publication Date
WO1981003145A1 true WO1981003145A1 (fr) 1981-11-12

Family

ID=10510402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1980/000080 WO1981003145A1 (fr) 1980-05-07 1980-05-07 Articles tubulaires de thermoformage

Country Status (2)

Country Link
JP (1) JPS57500729A (fr)
WO (1) WO1981003145A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1173194A (fr) * 1955-12-15 1959-02-20 Resistoflex Corp Procédé pour courber un tuyau flexible et produits obtenus
US2925621A (en) * 1952-09-13 1960-02-23 Kalle & Co Ag Method of making regenerated cellulose sausage casings in spirally coiled form
GB902745A (en) * 1958-01-08 1962-08-09 Hilmor Ltd Improvements in or relating to the bending of thermoplastic tubes
DE1268815B (de) * 1964-12-23 1968-05-22 Spinnfaser Ag Verfahren zum Biegen von thermoplastischen Kunststoffrohren mit grossen Nennweiten und insbesondere grossen Wandstaerken
US3719737A (en) * 1970-12-09 1973-03-06 Bard Inc C R Method of making a preformed curved epidural catheter
FR2342144A1 (fr) * 1976-02-24 1977-09-23 Lpa Les Produits Associes Procede de preformage d'un tuyau souple, a conduit multiple preferablement pour appareil hydraulique de soins corporels, moyen pour la mise en oeuvre du procede et tuyau obtenu par ce procede
FR2362712A1 (fr) * 1976-08-26 1978-03-24 Dynamit Nobel Ag Procede et dispositif de fabrication de pieces en forme, en particulier de raccords courbes, a partir de tubes en matiere synthetique thermoplastique expansee

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925621A (en) * 1952-09-13 1960-02-23 Kalle & Co Ag Method of making regenerated cellulose sausage casings in spirally coiled form
FR1173194A (fr) * 1955-12-15 1959-02-20 Resistoflex Corp Procédé pour courber un tuyau flexible et produits obtenus
GB902745A (en) * 1958-01-08 1962-08-09 Hilmor Ltd Improvements in or relating to the bending of thermoplastic tubes
DE1268815B (de) * 1964-12-23 1968-05-22 Spinnfaser Ag Verfahren zum Biegen von thermoplastischen Kunststoffrohren mit grossen Nennweiten und insbesondere grossen Wandstaerken
US3719737A (en) * 1970-12-09 1973-03-06 Bard Inc C R Method of making a preformed curved epidural catheter
FR2342144A1 (fr) * 1976-02-24 1977-09-23 Lpa Les Produits Associes Procede de preformage d'un tuyau souple, a conduit multiple preferablement pour appareil hydraulique de soins corporels, moyen pour la mise en oeuvre du procede et tuyau obtenu par ce procede
FR2362712A1 (fr) * 1976-08-26 1978-03-24 Dynamit Nobel Ag Procede et dispositif de fabrication de pieces en forme, en particulier de raccords courbes, a partir de tubes en matiere synthetique thermoplastique expansee

Also Published As

Publication number Publication date
JPS57500729A (fr) 1982-04-30

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