WO1995032383A1 - Tube fendu constitue d'un film polymere a memoire de forme - Google Patents

Tube fendu constitue d'un film polymere a memoire de forme Download PDF

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Publication number
WO1995032383A1
WO1995032383A1 PCT/CA1995/000238 CA9500238W WO9532383A1 WO 1995032383 A1 WO1995032383 A1 WO 1995032383A1 CA 9500238 W CA9500238 W CA 9500238W WO 9532383 A1 WO9532383 A1 WO 9532383A1
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WO
WIPO (PCT)
Prior art keywords
tube
strip
memory
longitudinal edges
split
Prior art date
Application number
PCT/CA1995/000238
Other languages
English (en)
Inventor
John M. Todd
Original Assignee
Todd John M
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 Todd John M filed Critical Todd John M
Priority to CA002190725A priority Critical patent/CA2190725C/fr
Publication of WO1995032383A1 publication Critical patent/WO1995032383A1/fr

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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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/10—Making preforms having internal stresses, e.g. plastic memory by bending plates or sheets
    • 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
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/40—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of definite length, i.e. discrete 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
    • 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
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • 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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • 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
    • B29K2079/00—Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
    • B29K2079/08—PI, i.e. polyimides or derivatives thereof
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/772—Articles characterised by their shape and not otherwise provided for
    • B29L2031/7732—Helical

Definitions

  • the invention relates to a shaped longitudinal strip of polymeric film, in tubular form and a continuous method of making such tubular form.
  • the tube may be used as a conduit for gases and for wrapping or protecting cable, optical fibres, pipe and other materials.
  • Tubes have also been used to carry gases, e.g. air ducts for use in buildings. It is known to make air ducts by rolling sheets of metal into discrete lengths of tube. The ends are shaped so that there is a male and female end, thus allowing the discrete lengths of tube to be joined to form a long run of ductwork. The longitudinal edges of the pieces of metal of the duct are mated. Such ducts occupy enormous amounts of room, which is a major disadvantage for storing before installation and for transporting. The cost of transporting the ducts is relatively expensive. It would be a great step forward if the ducts could be in much longer lengths and could be in compact form. Similar savings in terms of space and transportation costs are also desired, for example, for tubes used for forming columns of concrete. Disclosure of Invention
  • the present invention provides a tube which has a longitudinal axis and is made from an elongated strip of oriented crystalline thermoplastic polymer film, said strip having two longitudinal edges, said strip being memory-set into a split tubular shape.
  • the split is parallel to the longitudinal axis.
  • the split follows the shape of a helix.
  • the strip is memory set such that the longitudinal edges are adjacent one another. In another embodiment, the strip is memory-set such that portions adjacent the longitudinal edges overlap.
  • the longitudinal edges are adapted to be interlocked.
  • the interlocking edges are J-shaped in cross-section.
  • the longitudinal edges are interlocked.
  • the cross-sectional shape of the memory-set tube is selected from the group consisting of a circle, an oval and a polygon.
  • the polygon is selected from a triangle, a square, a rectangle, a pentagon, a hexagon and an octagon.
  • the strip is memory-set in circular or oval form.
  • the memory-set tube encases a strand-like or tubular article.
  • the strand-like or tubular article is selected from wire, cable, optical fibre and pipe. It is to be understood that the wire or optical fibre may be single strand or multi-strand.
  • the memory-set tube encases a plurality of objects. In a further embodiment the memory-set tube is temporarily opened into flat form.
  • the memory-set tube is temporarily opened into flat form, and the temporarily flat form is in a roll.
  • the polymeric film used in the present invention is an oriented, crystalline film of a thermoplastic polymer.
  • film as used herein also encompasses what are known in the art as sheets.
  • crystalline film also encompasses what is known in the art as semi-crystalline film. Crystalline film is distinguishable from amorphous film, by those skilled in the art. Crystallinity may be measured by methods such as differential scanning calorimetry (DSC), density determinations and X-ray diffraction (XRD) .
  • DSC differential scanning calorimetry
  • XRD X-ray diffraction
  • thermoplastic polymeric film is selected from polyamide, polyester and polyimide films.
  • the polyesters are film forming polyesters which may be made from diols and di-acids, for example alkylene glycols and aromatic dicarboxylic acids.
  • a preferred alkylene glycol is ethylene glycol.
  • Preferred dicarboxylic acids are terephthalic acid, isophthalic acid and naphthalenic acid.
  • the polyester is polyethylene terephthalate.
  • the polyester is polyethylene naphthalate.
  • the polyamide is of film-forming molecular weight and selected from polyamides made from i) an aliphatic aminoacid having from 6 to 12 carbon atoms, ii) from an aliphatic dicarboxylic acid and an aliphatic diamine, each having from 6 to 12 carbon atoms, and iii) mixtures of said polyamides
  • the crystalline polyamide is selected from nylon 6, nylon 6,6, nylon 6,9, nylon 6,10, nylon 6,12, nylon 12,12, and mixtures thereof.
  • the polyamide is selected from nylon 6, nylon 6,6 or mixtures thereof.
  • the elongated film is machine direction oriented or biaxially oriented.
  • an elastomer may be added to the crystalline film.
  • a polyester elastomer may be added to a crystalline polyethylene terephthalate film.
  • One such polyester elastomer is sold under the trade mark Hytrel and avaialbe from E.I du Pont de Nemours and Company, Delaware, U.S.A. Addition of such an elastomer assists in the wind-up of a roll of tube, without materially affecting the memory-set feature of the tube.
  • the present invention also provides a continuous process for making a tube, said process comprising: a) feeding a continuous elongated strip of oriented crystalline thermoplastic polymer film, which has two longitudinal edges, through a tube-forming section; b) in the tube forming section, continuously forming the strip into a tube, which has a longitudinal axis, so that the longitudinal edges of the strip are adjacent one another; c) heating the so-formed strip to its memory-setting temperature and then cooling the strip, to form a continuous, memory-set, split tube.
  • the continuous strip is fed into the tube forming section in a direction parallel to the longitudinal axis so that the split is parallel to the longitudinal axis.
  • the continuous strip is fed into the tube forming section at an angle to the longitudinal axis so that the split follows the shape of a helix.
  • the continuous split tube is wound into a roll.
  • the continuous split tube is opened out until it is temporarily flat, and the temporarily flat form is wound into a roll.
  • the continuous split tube is cut to form discrete lengths of tube.
  • the strip is formed so that portions adjacent the longitudinal edges overlap.
  • the strip is formed so that the longitudinal edges of the strip are adjacent one another and are adapted to interlock with one another.
  • the longitudinal edges are formed into J-shapes.
  • the strip is formed so that the longitudinal edges of the strip are adjacent one another and are interlocked with one another.
  • the strip is formed so that the cross-sectional shape of the strip is selected from the group consisting of a circle, an oval and a polygon.
  • the cross-sectional shape of the strip is selected from a triangle, a square, a rectangle, a pentagon, a hexagon and an octagon.
  • the strip is memory set in circular or oval form.
  • a continuous elongated structure is continuously fed into the tube forming section so that the structure is encased in the split tube.
  • the structure is selected from rope, wire, cable and optical fibre.
  • the encased structure may further be coated or wrapped with other films or materials, e.g. for waterproofing or other purposes.
  • Figures la and lb are three quarter views of a portion of tube with overlapping longitudinal edges.
  • Figure 2 is a three quarter view of a portion of a tube with interlocking longitudinal edges.
  • Figures 3 and 4 are schematic representations of one process of the present invention, for making a tube with a split parallel to the axis of the tube, seen from the side and top respectively.
  • Figures 5 and 6 show a variation of the process shown in Figures 3 and 4.
  • Figure 7 is a schematic representation of a process of the invention in which the tube has a helical split.
  • Figure la shows strip 11 which has been formed and memory-set into tubular form.
  • the tube 10 so formed has longitudinal edges 12 and 13 placed such that a portion of the strip adjacent 13 overlaps a portion of the strip adjacent edge 12.
  • the split in the tube is parallel to the longitudinal axis of tube 10.
  • Figure lb shows strip 11' which has been formed and memory-set into tubular form.
  • the tube 10' so formed has longitudinal edges 12* and 13' placed such that a portion of the strip adjacent 13' overlaps a portion of the strip adjacent edge 12'.
  • the split in the tube follows a helical path around tube 10' .
  • tube 20 has been formed and memory set with longitudinal edges 21 and 22 curled into interlocking relationship.
  • edges have J-shaped cross-sections.
  • Roll 31 is on spindle 40 on an unwind stand (not shown).
  • Flat film 30 is fed past controlling roller 42 and passed through a tube forming section 32, a heating section 33 and a cooling section 34 to form a memory-set tube 35.
  • strip 30 is fed in a direction parallel to the longitudinal axis of the tube and the split 45 in the memory-set tube 35 is parallel to the longitudinal axis of the tube.
  • the memory set tube 35 is fed past controlling rollers 44 and rolled up on a spindle or core 37 to form a reel of tubing 36.
  • a strand 38 e.g. rope
  • a strand 38 can be fed from roll 39, under controlling roller 43 so that strand 38 is encased in tube 35.
  • Strand 38 is on spindle 41 on an unwind stand (not shown).
  • the function of such a strand is to assist in keeping the tubular shape to tube 35 while on reel 36.
  • optical fibre or wire may be fed into the tube forming section. If such were the case, then it may be desirable to overwrap or coat tube 35 before being wound onto reel 36.
  • a long strip of flat film 50 e.g. polyester terephthalate film ro polyimide film
  • Film 50 is passed under controlling roller 60 and passed through a tube forming section 52, a heating section 53 and a cooling section 54 to form a memory-set tube 55.
  • the memory-set tube 55 is splayed open in splaying section 56 to form temporarily flat strip 57 which is then wound up in roll 58.
  • the tube 55 automatically reforms because the strip is memory-set in tubular form.
  • a long strip of flat film 65 e.g. polyester terephthalate film
  • a tube forming section 67 e.g. polyester terephthalate film
  • a heating section 68 e.g. a heating section 68
  • a cooling section 69 e.g. a cooling section 69
  • the pitch of the helix is dependent on the angle at which the roll of flat film 65 is directed, relative to the longitudinal axis of the tube.
  • the memory-set helically formed strip of tube 70 is unwound and rewound to form temporarily flat strip 71 which is then wound up in roll 72.
  • mandrels and forming shoes which shape the flat film into tubular form.
  • the shapes of the mandrels and forming shoes will dictate the cross- sectional shape of the tube, e.g whether it is circular, square, rectangular, whether there is any overlap of the longitudinal edges, as for example shown in Figure la, and whether the edges are themselves shaped, as for example shown in Figure 2.
  • the preferred cross-sectional shape is circular and it is preferred that the split is parallel to the longitudinal axis of the tube and that the longitudinal edges overlap, as shown in Figure la.
  • the cross-sectional shape of the tube be circular or rectangular and it is preferred that the longitudinal edges are able to be interlocked, e.g. with J-shaped edges. It may be possible, in instances wherein the strip is being wrapped around an elongated material, e.g. rope, cable, to use the elongated material in lieu of an internal forming mandrel, e.g. in the process shown in Figure 7 a cable may be used in lieu of a mandrel.
  • an elongated material e.g. rope, cable
  • Tube forming may be aided by heating the film prior to the tube forming section, or in the tube forming section. After being constrained into tubular form in the tube forming section, the tube is passed into the heating section.
  • the tube may be heated by infra-red heaters (shown as 61 in Figures 5 and 6, but not shown in Figures 3, 4 or 7), a hot air oven or other means.
  • the strip may be coated evenly or selectively with a microwave absorbing material and heating be accomplished with microwave energy.
  • the temperature and residence time of the tube in the heating section is adjusted so that the film reaches its memory-setting temperature range. The temperature and residence time will affect the strength of the memory-set. Easy experimentation will determine the optimum temperature and residence time for a given polymeric film and film thickness.
  • the memory-setting temperature is preferably in the range of about 143-154°C (290-310°F). Memory-setting temperatures for other memory-settable films may be determined by easy experimentation.
  • diameters of tubes, having the split parallel to the axis of the tube will be limited by the available widths of flat film, e.g. 30 in Figure
  • the tube is to retain its tubular form in the roll, it may be desirable in some instances to help the tube retain its shape by encasing a disposable material, such as rope, inside the split tube. In other instances it may be of little consequence that there is no rope or other material inside the tube, because even if the tube is flattened out somewhat in the roll form, the tube will spring back to its original shape on being unwound from the roll.
  • a disposable material such as rope
  • the present process it may be desirable to incorporate the present process, so that the cable, optical fibre or wire is continuously encased in the split tube and wound up into a roll. It may also be desirable to overwrap the split tube with other materials, e.g. for waterproofing or other purposes.
  • the thickness of the oriented film will depend on the intended use for the tube.
  • a tube that is intended for wrapping wire, cable or optical fibre may be from 75-250 ⁇ (3-10 mil) thick
  • a tube intended for an air duct may be from 300-625 ⁇ m (12-25 mil) thick or a tube for concrete applications may be 750-1000 ⁇ m (30-40 mil) thick.
  • the crystalline thermoplastic film is an oriented film, and is a resiliently flexible crystalline or semi- crystalline film which is capable of being thermally treated to have a permanent memory set.
  • the film has advantages in that it is flexible, and has strength and stability in a wide range of environments, e.g. hot, cold, wet or damp environments. It has been found that in most environments, polyethylene terephthalate film is suitable. In certain environments, e.g. where temperatures are in excess of about 120°C (248°F), polyethylene naphthalate or polyi ide film may be desirable.
  • the preferred films are selected from polyester, polyamide or polyimide films.
  • oriented nylon (polyamide) or polyimide films e.g. Kapton® polyimide film
  • the preferred film is an oriented polyester film, which is capable of being prestressed with a substantially permanent curvature of a small radius and relatively long duration memory.
  • a particularly preferred film is an oriented polyethylene terephthalate film.
  • One such oriented polyethylene terephthalate film is sold by E.I. du Pont de Nemours and Company under the trade mark "Mylar” .
  • Mylar® polyester film As the oriented thermoplastic polymeric film. It is to be understood, however, that this is for exemplification and clarity of description and is not to be considered limiting.
  • polyester film suitable for use in the present invention is usually biaxially oriented, flat and heat set in an annealing step.
  • Homopoly er polyethylene terephthalate has a glass transition temperature (T g ) of about 70°C (158°F)and a crystalline melting temperature of about 255°C (491°F).
  • T g glass transition temperature
  • 158°F glass transition temperature
  • 255°C (491°F) a crystalline melting temperature
  • crystallinities of about 40% are achieved.
  • the T g is about 70°C (158°F)
  • thermoplastic polymers having a glass transition temperature at about or above ambient temperature are suitable for use in the present invention. Under some circumstances it may be desirable to impart longitudinal elasticity to the film by adding a small amount of elastomer to the crystalline film. Oriented polyethylene terephthalate film, for example, does not stretch even though it is flexible, and it may be advantageous to add small quantities of elastomer, e.g. polyester elastomer to the film.
  • the crystalline polyamide may be made from acid-forming and amine-forming derivatives of said acids and amines, e.g. esters, amine salts and the like.
  • Examples of such acids include adipic acid, azelaic acid, sebacic acid, and dodecanoic acid.
  • Examples of such amines include hexamethylene diamine and octamethylene diamine.
  • An especially preferred crystalline polyamide is nylon 6,6.
  • the crystalline polyamide may be a blend of different polyamides, e.g. nylon 6 and nylon 66 or a copolymer of nylon 6 and nylon 66.
  • the heat deformation point is well below the melting point.
  • the film may be memory-set for use in the present invention.
  • a suitable memory-setting temperature for Mylar polyester film is around 143-154°C (290-310°F).
  • the preferred temperatures can be determined by easy experimentation.
  • the tube is intended to be used as a protective device, e.g. when wrapping wire, cable, optical fibre, tree trunks and the like, it may be desirable for the memory-settable film to be laminated to another material.
  • the oriented crystalline thermoplastic polymer film may be laminated to an aramid fabric, e.g. a fabric of Kevlar® aramid fibre.
  • an insulating material e.g. polyurethane foam.
  • the split tube has a large number of uses.
  • such a memory-set tube may be used to hold heat tracing cables in place around a pipe.
  • Thermal insulation wrap may then be placed around the memory-set tube.
  • the thermal insulation may be held in place with the memory-set tube.
  • the insulation is held in place on the pipe, temporarily.
  • With a memory-set tube having the split parallel to the longitudinal axis the longitudinal edges of the memory-set split tube are pried apart so that the edges are wider apart than the diameter of the insulation, and the tube is slipped over the insulation. The edges of the tube are released and the tube returns to its memory-set form.
  • the memory-set tube may be additionally secured with securing bands or tape.
  • the split tube is applied in a similar manner when wrapping materials like wire, cable or optical fibre.
  • the split tube may be encased in other materials, or sealed with, e.g. waterproofing materials.
  • split tube will return to its memory-set configuration, e.g. with overlapped edge portions.
  • memory-set tube (with the split parallel to the longitudinal axis), which has been splayed and wound up in flat form, e.g.
  • a workperson takes the roll to the building site, unrolls an appropriate length and cuts to length.
  • the memory-set feature causes the strip to reform into a tube.
  • the longitudinal edges have interlocking edges in order to allow the person to interlock the edges after unrolling the tube. If desired the edges, after interlocking, can be further secured with tape, or if the edge surfaces are coated with an adhesive or thermoplastic coating, the edges can be joined more permanently. The tube can then be put in place in the building.
  • helically-set tube may also have been wound up in flat form on a roll.
  • the length of strip needed to make a given length of tube is longer than the tube itself and depends on the pitch of the helix. The steeper the pitch the more windings per metre of tube are required.
  • the tube may only have a few turns per metre, whereas for a 30° pitch the tube would have a larger number of turns per meter. Accordingly, a tube with a helix of 30° pitch would require a longer strip to make than would a tube with a helix of 5° pitch.
  • a tube with interlocked longitudinal edges can also be used, in discrete lengths, to encase objects as diverse as ball bearings, documents, tennis balls, castors or to provide formers for concrete pouring and curing, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)

Abstract

Des câbles, des fils métalliques, des fibres optiques et autres objets allongés peuvent être entourés d'un tube (1d) présentant un axe longitudinal et constitué d'une bande allongée d'un film polymère thermoplastique cristallin orienté. On donne à cette bande une forme de tube fendu qu'elle pourra reprendre par mémoire de forme. La fente (13) peut être parallèle à l'axe longitudinal ou suivre un trajet hélicoïdal le long du tube. De préférence, la forme que la bande reprendra par mémoire de forme est telle que des parties adjacentes à ses bords longitudinaux se recouvrent ou s'interpénètrent (21, 22). Lorsque la bande se trouve sous forme tubulaire, le tube fendu ainsi formé peut être ouvert et aplati, puis réenroulé sur un rouleau afin d'en faciliter le transport. Le tube à mémoire de forme reprendra sa forme lorsque la bande sera déroulée du rouleau.
PCT/CA1995/000238 1994-05-24 1995-04-25 Tube fendu constitue d'un film polymere a memoire de forme WO1995032383A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002190725A CA2190725C (fr) 1994-05-24 1995-04-25 Tube fendu constitue d'un film polymere a memoire de forme

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9410383A GB9410383D0 (en) 1994-05-24 1994-05-24 Split tube of memory-set polymeric film
GB9410383.5 1994-05-24

Publications (1)

Publication Number Publication Date
WO1995032383A1 true WO1995032383A1 (fr) 1995-11-30

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GB (1) GB9410383D0 (fr)
WO (1) WO1995032383A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004075961A1 (fr) * 2003-02-21 2004-09-10 Medtronic Inc. Dispositifs sous forme de tige pour dispositif medical

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Publication number Priority date Publication date Assignee Title
FR1142855A (fr) * 1956-03-09 1957-09-24 Etirage Et Laminage Du Nord Et Manchon de raccordement pour tubes en ligne
US3199541A (en) * 1963-04-03 1965-08-10 Flexible Tubing Corp Interlocking strip flexible hose
US3988399A (en) * 1971-04-02 1976-10-26 Raychem Corporation Heat recoverable articles and methods therefor
FR2370225A1 (fr) * 1976-11-05 1978-06-02 Raychem Sa Nv Objet d'etancheite et d'isolement et procede utilisant cet objet
JPS578113A (en) * 1980-06-19 1982-01-16 Mitsubishi Plastics Ind Ltd Shrink-coating method using sheet with chuck
EP0048147A1 (fr) * 1980-09-13 1982-03-24 Raychem Limited Revêtement, méthode pour envelopper un substrat utilisant un tel revêtement et son application
DE3230215A1 (de) * 1982-08-13 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Laengsgeteiltes muffenrohr aus thermoplastischem kunststoff mit formgedaechtnis

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1142855A (fr) * 1956-03-09 1957-09-24 Etirage Et Laminage Du Nord Et Manchon de raccordement pour tubes en ligne
US3199541A (en) * 1963-04-03 1965-08-10 Flexible Tubing Corp Interlocking strip flexible hose
US3988399A (en) * 1971-04-02 1976-10-26 Raychem Corporation Heat recoverable articles and methods therefor
FR2370225A1 (fr) * 1976-11-05 1978-06-02 Raychem Sa Nv Objet d'etancheite et d'isolement et procede utilisant cet objet
JPS578113A (en) * 1980-06-19 1982-01-16 Mitsubishi Plastics Ind Ltd Shrink-coating method using sheet with chuck
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WO2004075961A1 (fr) * 2003-02-21 2004-09-10 Medtronic Inc. Dispositifs sous forme de tige pour dispositif medical
US7120502B2 (en) 2003-02-21 2006-10-10 Medtronic, Inc. Shaft constructions for a medical device

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CA2190725C (fr) 2001-12-11
CA2190725A1 (fr) 1995-11-30

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