EP0025337A1 - Method and apparatus for applying a coating to a sheet material - Google Patents

Method and apparatus for applying a coating to a sheet material Download PDF

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Publication number
EP0025337A1
EP0025337A1 EP80303072A EP80303072A EP0025337A1 EP 0025337 A1 EP0025337 A1 EP 0025337A1 EP 80303072 A EP80303072 A EP 80303072A EP 80303072 A EP80303072 A EP 80303072A EP 0025337 A1 EP0025337 A1 EP 0025337A1
Authority
EP
European Patent Office
Prior art keywords
coating
roller
endless path
absorbent
coating material
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Withdrawn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
EP80303072A
Other languages
German (de)
English (en)
French (fr)
Inventor
Eric Wood
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.)
Insituform International Inc
Original Assignee
Insituform International Inc
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 Insituform International Inc filed Critical Insituform International Inc
Publication of EP0025337A1 publication Critical patent/EP0025337A1/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
    • D06B1/10—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material
    • D06B1/14—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller
    • D06B1/148—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller the treating material being supplied to the roller by spraying or pouring

Definitions

  • This invention relates to a method of applying an impermeable coating to an absorbent sheet material, such as a felt of synthetic fibres.
  • the objective of the invention is to provide a simple and effective method for the application of an impermeable coating to an absorbent sheet material to make it suitable for use for example in a pipeline or passageway lining process which we have invented.
  • a tubular bag of the coated absorbent material is provided, the coating being to the outside of the bag, whilst the absorbent material lies to the inside.
  • Curable resin is injected to the bag in order to soak the resin absorbent material, the coating serving as a retention member to prevent egress of the resin through the wall of the bag.
  • the air is evacuated from inside the bag by means of a suction apparatus connected to a suction tube which is inserted in the bag and then retracted from one end as the resin is injected from the other end.
  • a suction apparatus connected to a suction tube which is inserted in the bag and then retracted from one end as the resin is injected from the other end.
  • the bag is everted along a tubular pipeline or passageway by the utilisation of a fluid pressure differential, the coating again serving as the relatively impermeable membrane which permits such eversion to take place.
  • the coated material is usable, to achieve similar results, in different methods of application.
  • the material may be formed into a bag with the coating membrane to the inside, and the whole bag being enclosed in a flexible, impermeable sheath.
  • the absorbent layer is again soaked in resin, and the whole assembly is inflated into position on to a passageway wall.
  • the present invention is concerned with a means of applying the coating to the resin absorbent material.
  • the coating material in liquid or fluent form being of a nature which subsequently solidifies, is applied to a surface which defines and moves in an endless path, the coating being applied to the moving surface over a length portion of the said endless path before the absorbent sheet material is applied to the means defining the endless path so as to come into contact with the coating material applied thereto, the arrangement being that the surface of the coating material which is applied to the absorbent material will be of sufficient tackiness to bond to the absorbent material at the surface thereof whilst the underlying body of the coating is sufficiently cured to prevent excess penetration into the absorbent material and to enable the absorbent material to be separated from the means defining the endless path, and to take with it the coating material.
  • An important aspect of the invention resides in the fact that the coating material-is applied over a length portion of the endless path, because it can be arranged within the composition of the coating material to provide that the coating material which is applied to the endless path at the beginning of said length portion, having regard to the direction of movement of the surface defining the endless path, will be solidified or partly solidified by the time it reaches the zone where the absorbent material contacts the said means defining the endless path, whereas the coating material which is applied towards the end of the said length region, will still be wet upon reaching the location where the resin absorbent material contacts the means defining the endless path, and that wetness will serve to form a bond between the resin absorbent material and the coating material.
  • the said endless path is defined by the surface of a rotatable roller, arranged with its axis of rotation horizontal.
  • the roller surface, which defines the endless path may be defined by a release material, such as TEFLON (registered trade mark).
  • TEFLON registered trade mark
  • a release material is of course meant a material which has characteristics such that the coating material will readily peel therefrom when solidified.
  • the interior of the roller may if desired be heated or cooled depending upon the coating material which is being used, in order to accelerate the solidification or "curing" of the coating material.
  • the coating material is preferably applied through a spray head which reciprocates axially of the roller so as to apply the coating material in layers whilst the roller rotates.
  • the spray head will be such as to define a spray angle to ensure that the coating material is applied over said length portion of the roller surface.
  • the coating material is a polyurethane resin
  • the resin absorbent material may be a synthetic felt,typically polyester felt.
  • the felt which is of course flexible, is preferably trained around the roller between two locations so as to define a subtended angle of somewhere in the region of 270°, and the coated resin absorbent material may conveniently be peeled from the roller by means of a stripper mandrel which is rotatable and has its axis of rotation parallel to the axis of rotation of the roller.
  • the method can be applied to the coating of sheet material in flat web form or in tube form.
  • the thickness of the coating can be accurately controlled by controlling the volume of coating material which is sprayed from the spray head, by adjusting the speeds of the roller and felt, and by altering the speed of reciprocation of the spray head.
  • the method enables coated material, in flat web form, for example for the purposes as herein described to be made in very large widths and much less expensively than by the current method which involves calendering the coating material onto the flat felt at a number of passes and in which there is a maximum width which can be produced.
  • the apparatus for performing the known calendering method furthermore is extremely expensive making the resulting product expensive.
  • the invention also provides apparatus for carrying out the method.
  • Fig. 1 the operative apparatus of Fig. 1 is shown only in diagrammatic form, and it is to be understood that it will comprise all of the necessary components means to enable the apparatus to function as described. It will also comprise the necessary control means to control its operation.
  • the apparatus includes a heated roller 10 arranged on a frame 11 with its axis of rotation horizontal, the roller being coated with a release material such as PTFE.
  • Two webs of needled felt (Fig. 2) each of which may be 2.5 metres wide are fed from storage rolls 12 in parallel to a sewing device 14, which sews adjacent edges of the felt together in butting or overlapped relationship.
  • the thus sewed together felt passes over a guide roller 16 so as to be urged against the surface of the heated roller 10, and as the said roller 10 rotates as indicated by the arrow 18, the felt is held firmly against the roller 10 over a subtended angle of 270° approximately until it reaches a take-off roller or mandrel 20, serving to strip the felt from the roller 10.
  • the felt then passes to a slitting plant indicated by a pair of nip rollers 22, to cut the felt to size, and finally the treated felt is wound on to a storage reel 24.
  • the slitting plant 22 has adjustable capability in order that the final width of the felt can be adjusted to suit requirements.
  • the felt passes round the roller 10, it is coated by means of a spraying apparatus 27, with a coating material 28, to provide a relatively gas and water impermeable surface to one side of the felt, at least for the purposes as explained herein.
  • the coating material which may for example be a two part curable resin system comprising isocyanate and polyurethane resin or a two part P.V.C. resin, is sprayed from a spray head 26 whilst still in liquid condition, over a subtended angle 29, so as to be applied over a circumferential length portion of the roller 10 between the guide and take-off rollers 16 and 20.
  • the spraying of the coating material over an angular portion of the roller is of significance as illustrated in Fig.3, because the material 28A which contacts the roller in region A i.e. at the beginning of the circumferential length portion has in fact cured or partially cured by the time it reaches region B which region is shown in Figure 2, or the end of the arcuate length portion, whereas the coating material 28B (as indicated by the dotted region) which impinges upon region B remains soft and uncured when it comes into contact with the felt material.
  • the coating material is prevented from penetrating and being absorbed by the absorbent felt, but still anchors firmly to the fibrous surface of the felt.
  • the spray apparatus 27 is arranged to reciprocate in a direction parallel to the axis of rotation of the roller 10 on a guide rail 13 in order to ensure -that the building up of layers of coating material on the roller 10 to give the required degree of thickness of coating material in the final product.
  • the rate or reciprocation of the spray head 10 is selected to give the, required coating thickness, and for example may make three to four passes as the roller rotates between positions A and B.
  • F ig. 1 also shows a temperature control device 17, a drive motor 19 for reciprocating the spray head 27 and an air pump 21 for the spraying of the coating material from head 27 by means of air under pressure.
  • the coating material is applied in layers by means of doctor blades and reservoirs of the coating material, spaced circumferentially of the roller, which in this case is heated.
  • the coating is applied by a moving film extruder which extrudes a film of the coating material and lays it, axially of the roller which in this case is cool relative to the film.
  • the film extruder reciprocates axially of the roller and builds up the coating material in layers, similar to the spray head arrangement described.
  • the apparatus described can be used for coating very wide flat felts (of the order of 5 metres) which is not possible with conventional methods.
  • Fig. 4 illustrates another embodiment of the invention, in which the coating is applied to a tubular resin absorbent material in this case a needled felt.
  • the felt is made up into tubular form in known fashion, from one or more carded laps 100 of fibrous material, which are wound helically around spaced cantilevered mandrels 110, 112, and 114.
  • the overlapping coils are also moved lengthwise of the mandrels as indicated by the arrow 116, and are needled together by means of a reciprocating needle bar 118 in order to form a coherent compact felt tube, which is continuously rotating as indicated by the arrow 120.
  • the tube 122 takes up a triangular shape by virtue of travelling round the mandrels 110, 112 and 114, and one of the sides of the triangle is urged against the coating application roller 124 from which the coating is applied, in a manner similar to that already described.
  • Reference numeral 126 indicates the spray head which reciprocates axially of the roller 124 as indicated by arrow 128.
  • the resulting tube 122 which feeds from the ends of the cantilevered rollers 110, 112 and 114 is of course coated with an impermeable membrane similar to the flat felt previously described.
  • the tube 122 is deposited in a container, or is wound on a roller in a fashion suitable to remove the twist which would otherwise be imparted thereto by virtue of the tube 122 simultaneously being fed axially as indicated by arrow 116 and rotating as indicated by arrow 120. A seamless even coating on the tube is achieved by this method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Laminated Bodies (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
EP80303072A 1979-09-08 1980-09-03 Method and apparatus for applying a coating to a sheet material Withdrawn EP0025337A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7931239 1979-09-08
GB7931239 1979-09-08

Publications (1)

Publication Number Publication Date
EP0025337A1 true EP0025337A1 (en) 1981-03-18

Family

ID=10507710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80303072A Withdrawn EP0025337A1 (en) 1979-09-08 1980-09-03 Method and apparatus for applying a coating to a sheet material

Country Status (2)

Country Link
EP (1) EP0025337A1 (enrdf_load_stackoverflow)
JP (1) JPS5689840A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2940168A1 (fr) * 2008-12-19 2010-06-25 Cheynet & Fils Procede d'assemblage d'une bande support avec une matiere adhesive et installation de mise en oeuvre du procede
EP2873762A1 (en) * 2013-11-19 2015-05-20 James Dewhurst Limited Textile coating apparatus and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL289083A (enrdf_load_stackoverflow) *
GB587671A (en) * 1943-11-01 1947-05-02 William Yarworth Jones Improvements in or relating to coated fabrics
FR1202421A (fr) * 1958-07-16 1960-01-11 Ind Cotonniere Sa D Procédé d'empesage permanent et produit empesé obtenu selon le procédé
FR1388404A (fr) * 1964-04-03 1965-02-05 Menschner Textil Johannes Dispositif de revêtement de nappes de tissu sensibles au déjettement, à l'aide dematières synthétiques thermoplastiques, ou analogues
US3800569A (en) * 1971-05-07 1974-04-02 Riggs & Lombard Inc Apparatus for applying liquid to a running web
DE2346164A1 (de) * 1973-09-11 1975-03-20 Ideal Vliesstoffabrik Kg Verfahren und vorrichtung zum impraegnieren von vliesen
GB1400146A (en) * 1971-07-15 1975-07-16 Newton C Colouration method and machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL289083A (enrdf_load_stackoverflow) *
GB587671A (en) * 1943-11-01 1947-05-02 William Yarworth Jones Improvements in or relating to coated fabrics
FR1202421A (fr) * 1958-07-16 1960-01-11 Ind Cotonniere Sa D Procédé d'empesage permanent et produit empesé obtenu selon le procédé
FR1388404A (fr) * 1964-04-03 1965-02-05 Menschner Textil Johannes Dispositif de revêtement de nappes de tissu sensibles au déjettement, à l'aide dematières synthétiques thermoplastiques, ou analogues
US3800569A (en) * 1971-05-07 1974-04-02 Riggs & Lombard Inc Apparatus for applying liquid to a running web
GB1400146A (en) * 1971-07-15 1975-07-16 Newton C Colouration method and machine
DE2346164A1 (de) * 1973-09-11 1975-03-20 Ideal Vliesstoffabrik Kg Verfahren und vorrichtung zum impraegnieren von vliesen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2940168A1 (fr) * 2008-12-19 2010-06-25 Cheynet & Fils Procede d'assemblage d'une bande support avec une matiere adhesive et installation de mise en oeuvre du procede
WO2010076438A1 (fr) * 2008-12-19 2010-07-08 Cheynet & Fils Procede d'assemblage d'une bande support avec une matiere adhesive et installation de mise en oeuvre du procede
EP2873762A1 (en) * 2013-11-19 2015-05-20 James Dewhurst Limited Textile coating apparatus and method

Also Published As

Publication number Publication date
JPS6121700B2 (enrdf_load_stackoverflow) 1986-05-28
JPS5689840A (en) 1981-07-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19810406

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19821216

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WOOD, ERIC