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EP0035947A1 - Verfahren zum Anbringen einer Kunststoffbekleidung an einem Gegenstand; Vorrichtung zur Durchführung des Verfahrens und der erhaltene Gegenstand - Google Patents

Verfahren zum Anbringen einer Kunststoffbekleidung an einem Gegenstand; Vorrichtung zur Durchführung des Verfahrens und der erhaltene Gegenstand Download PDF

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Publication number
EP0035947A1
EP0035947A1 EP81400361A EP81400361A EP0035947A1 EP 0035947 A1 EP0035947 A1 EP 0035947A1 EP 81400361 A EP81400361 A EP 81400361A EP 81400361 A EP81400361 A EP 81400361A EP 0035947 A1 EP0035947 A1 EP 0035947A1
Authority
EP
European Patent Office
Prior art keywords
centrifugation
phase
action
plastic material
cold
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Withdrawn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
EP81400361A
Other languages
English (en)
French (fr)
Inventor
Michel Lebrun
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.)
SARL FERELEC
Original Assignee
SARL FERELEC
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 SARL FERELEC filed Critical SARL FERELEC
Publication of EP0035947A1 publication Critical patent/EP0035947A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • the invention relates to a method of fixing a plastic coating on the inner cylindrical surface of a hollow metal body, to the device for carrying out this method and to the coated hollow body obtained using this process. It applies more particularly but not exclusively to hollow bodies such as tubular elements, intended to form, in isolation, guide parts, such as for example cylinder bodies, or, after assembly between them, a pipe for the transport of gases, more or less viscous liquids or even solids.
  • the body In its various applications, the body must have, at least internally, on the one hand, a perfectly smooth surface to promote sliding and, on the other hand, sufficient abrasion resistance to avoid an early replacement of the body.
  • the plastic material such as for example polyamide "11” better known under the brand "RILSAN” and this, in a layer at the same time most regular and as thick as possible, in order to offer both a sufficient geometric correction to avoid subsequent machining, as well as a large reserve of material, in anticipation of wear by abrasion.
  • these plastics Before fixing, these plastics generally come in a pulverulent form, with a very fine particle size and for example of twenty to two hundred microns, so that the mass of the solid particles flows practically like a fluid.
  • various fixing methods are currently used: According to a first method, the metal part to be coated is firstly heated in an oven and then immersed in the plastic powder contained in a tank, which powder is kept in suspension by air. On contact with hot metal surfaces, the powder melts and thus forms a deposit whose thickness, which varies from two hundred fifty to five hundred microns, depends on the temperature of the part and the duration of its retention in the powder.
  • the tube to be coated is heated by an induction coil after being inserted in a circuit in which a flow of powder-charged air is established.
  • the powder melts and forms a deposit with a thickness of one hundred and fifty to two hundred and fifty microns.
  • the powder is suspended in water and this solution is applied with a paint gun which is carried by a rod around which the tube is rotated and this more or less quickly depending on the thickness of the desired film. Then, the tube is heated first slowly, to allow the elimination of water and then quickly to cause melting, before fixing by cooling a film of fifty to three hundred microns of plastic material.
  • the thicknesses permitted by the three aforementioned processes are manifestly insufficient for many applications such as, for example, for pipelines, for the hydraulic transport of solids and whose desired service life is about twenty years.
  • the coating should have a thickness of at least six millimeters.
  • the tube to be coated rests on a support which causes it to rotate about its axis, and this at low speed; whole, for example four meters per minute.
  • the powder dose melts over a certain thickness.
  • the plastic both that thus melted and that still solid, tends to remain in the lower cylindrical segment, despite the rotation of the tube.
  • this plastic material only slides except for a film which by adhesion remains attached to said wall.
  • a result which the invention aims to obtain is the fixing on the inner cylindrical surface of a hollow metallic body, of a coating of plastic material on the one hand, having both a regular surface condition and a perfect geometric correction , and on the other hand, which can reach a very large thickness.
  • the gross hollow body 1 passes, first of all, to a station 2 for preparing the surfaces ensuring the degreasing and the mechanical elimination of the surface oxides and on the other hand, this station 2 of surface preparation is optionally followed, and this depending on the nature of the plastic which must be fixed, by a station 3 for applying a so-called "primary" under layer intended to strengthen the bonding of this plastic.
  • this body 7 passes to a centrifugation station 8, in which there are three successive phases 9, 10, 11 between which the centrifugation action continues.
  • a centrifugation station 8 in which there are three successive phases 9, 10, 11 between which the centrifugation action continues.
  • a first phase 9 the centrifugation takes place cold, to already distribute concentrically the material still solid in an even layer.
  • the centrifugation speed "N”, expressed in revolutions per minute, is determined according to the size, expressed in meters, of the interior “r” and exterior “R” radii of the coating and according to the pressure "P", expressed in bars , which we want to print with plastic grains by said centrifugation, from the known relationship: d represents the density of the plastic chosen and the acceleration due to gravity.
  • the heating temperature is obviously determined as a function of the characteristics of the plastic to be fix to be certain of reaching the melting point but also not to exceed the temperature from which the molten plastic material begins to agitate.
  • the device for implementing this process comprises a centrifuge bench 16, provided with a heat source 17 as well as means, some 18 for adjusting the centrifugation speed, the others 19 for switching on and off. heating or even intensity adjustment.
  • this device will include a table 20 with which are associated drums or a series of rollers 21, 22 on which the body 7 rests, then formed from the raw body 1 having simply received the dose of powder 6.
  • the body 7 is held on these supports 21, 22 by at least one drum or a series of pressure rollers 23, which can be eclipsed for mounting and dismounting the bodies 7 to be coated.
  • At least one of these supports 21, 22 and / or pressure means 23 is rotated and, by adhesion to the body 7, communicates to the latter its own rotational movement.
  • the table 20 is associated with a chair 24 supporting a motor 25 grouped with a variable speed drive 26 whose output shaft 27 is linked in rotation to the shaft 28, of the drum or of the series of rollers 22 , via a transmission 29 of any known type.
  • the heating can also be of any known type. In an exemplary embodiment, it comprises, running under the body between its supports 21, 22, a gas ramp 30 or more 30, 31 depending on the diameter of the body to be coated.
  • the assembly is housed under a removable casing 32 preferably lined internally with an insulating material 33 such as asbestos to both retain the heat given off by the heating and protect the environment against any projection.
  • a temperature control probe 35 can be immersed, as well as means for forced cooling of the body during the last phase.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Moulding By Coating Moulds (AREA)
EP81400361A 1980-03-11 1981-03-10 Verfahren zum Anbringen einer Kunststoffbekleidung an einem Gegenstand; Vorrichtung zur Durchführung des Verfahrens und der erhaltene Gegenstand Withdrawn EP0035947A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8005852A FR2477949A1 (fr) 1980-03-11 1980-03-11 Procede de revetement par centrifugation de la surface interieure d'un corps metallique cylindrique par de la matiere plastique, son dispositif de mise en oeuvre et les corps ainsi revetus
FR8005852 1980-03-11

Publications (1)

Publication Number Publication Date
EP0035947A1 true EP0035947A1 (de) 1981-09-16

Family

ID=9239707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400361A Withdrawn EP0035947A1 (de) 1980-03-11 1981-03-10 Verfahren zum Anbringen einer Kunststoffbekleidung an einem Gegenstand; Vorrichtung zur Durchführung des Verfahrens und der erhaltene Gegenstand

Country Status (2)

Country Link
EP (1) EP0035947A1 (de)
FR (1) FR2477949A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2410546A1 (fr) * 1977-11-30 1979-06-29 American Cast Iron Pipe Co Procede pour appliquer un revetement constitue par un polymere contenant une charge sur la face interieure d'un corps cylindrique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3219472A (en) * 1961-09-29 1965-11-23 Johns Manville Method of coating the interior surface of a porous pipe
US3413955A (en) * 1965-04-23 1968-12-03 Trw Inc Apparatus for coating the interior of a container with a resinous film
US3488206A (en) * 1966-12-29 1970-01-06 Johns Manville Method of coating the interior surface of a porous pipe
JPS4958123A (de) * 1972-10-06 1974-06-05

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2410546A1 (fr) * 1977-11-30 1979-06-29 American Cast Iron Pipe Co Procede pour appliquer un revetement constitue par un polymere contenant une charge sur la face interieure d'un corps cylindrique

Also Published As

Publication number Publication date
FR2477949A1 (fr) 1981-09-18
FR2477949B1 (de) 1983-07-18

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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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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19820225

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: 19831026

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEBRUN, MICHEL