EP0300522B1 - Méthode pour appliquer à un élément une couche d'adhésif thermoplastique - Google Patents

Méthode pour appliquer à un élément une couche d'adhésif thermoplastique Download PDF

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Publication number
EP0300522B1
EP0300522B1 EP88201236A EP88201236A EP0300522B1 EP 0300522 B1 EP0300522 B1 EP 0300522B1 EP 88201236 A EP88201236 A EP 88201236A EP 88201236 A EP88201236 A EP 88201236A EP 0300522 B1 EP0300522 B1 EP 0300522B1
Authority
EP
European Patent Office
Prior art keywords
solvent
adhesive layer
thermoplastic
applying
solution
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.)
Expired - Lifetime
Application number
EP88201236A
Other languages
German (de)
English (en)
Other versions
EP0300522A1 (fr
Inventor
Frans Bernard Bruns
Wilhelmus Hendrikus Maria Van Deumel
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.)
Koninklijke Nijverdal-Ten Cate NV
Original Assignee
Koninklijke Nijverdal-Ten Cate NV
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 Koninklijke Nijverdal-Ten Cate NV filed Critical Koninklijke Nijverdal-Ten Cate NV
Priority to AT88201236T priority Critical patent/ATE85905T1/de
Publication of EP0300522A1 publication Critical patent/EP0300522A1/fr
Application granted granted Critical
Publication of EP0300522B1 publication Critical patent/EP0300522B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • 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
    • B05D3/10—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 other chemical means
    • B05D3/107—Post-treatment of applied coatings
    • 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
    • B05D7/02—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 macromolecular substances, e.g. rubber
    • 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
    • B05D7/02—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 macromolecular substances, e.g. rubber
    • B05D7/04—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 macromolecular substances, e.g. rubber to surfaces of films or sheets

Definitions

  • the invention relates to a method for applying an adhesive layer consisting substantially of thermoplastic plastic to a body, for example a honeycomb plate which can serve as core of a sandwich panel with thermoplastic covering sheets.
  • thermoplastic plastic is deposited from a solution onto a body by bringing the solution to saturation using artificial means.
  • the surface of the body can be given a porous structure, as a result of which the process attains a great depth of penetration.
  • This known art is used for instance in the manufacture of semi-permeable membranes, which can be used as filters for a specific particle size or for the separation of two phases.
  • an adhesive layer is applied from a solution to the core material and integrated with the skin layers by fusing or diffusion.
  • a method is described in EP-A-0 274 789 published after the present application's priority date, which defines a state of the art according to Article 54(3) EPC. Described in this patent application is a method according to which the solvent is partially removed by evaporation.
  • High quality thermoplastics which can be used for fibre reinforced materials usually require solvents with a high boiling point. The evaporation of the solvent therefore requires a treatment at a high temperature.
  • n-methylpyrrolidone NMP
  • n-methylpyrrolidone NMP
  • the invention has for its object to propose a method which does not have the said drawbacks of the known art and moreover has a starting point known processes from the field of membrane technology.
  • Fig. 1 shows a device 1 for applying an adhesive layer consisting substantially of thermoplastic plastic to a honeycomb plate 2 which can serve as core of a sandwich panel with thermoplastic covering sheets.
  • Plate 2 is transported through coating rollers 3, which rollers 3 transfer the solution 6 present in the supply trays 5 therefrom via rolls 4 onto the end wall surfaces of the honeycomb plate 2.
  • the solution 6 consists of the thermoplastic plastic for application in n-methylpyrrolidone (NMP). Plate 2 is conveyed further in the direction of the arrow 7 by the coating rollers 3.
  • the plate 2 passes through a steam chamber 10 wherein steam coming from a source (not drawn) is introduced into steam chamber 10 via steam inlets 11.
  • the honeycomb plate 2 is then trained through a container 12 in which is placed a mixture 13 containing water with a predetermined quantity of NMP.
  • the honeycomb plate 2 runs through an after treatment station 14 wherein the formed adhesive layer is further dried by having air passed along it, as is indicated symbolically with arrows 15.
  • conveyor rolls 16 Located downstream relative to the after treatment station 14 are two conveyor rolls 16 which, as a result of an appropriate drive speed, convey plate 2 at the same speed as the coating rollers 3.
  • the finished plate is guided between two pressure/conveyor belts 17 with the interpositioning of protective foils 18 which are carried along by the honeycomb plate 2 and unrolled from supply rolls 19.
  • the honeycomb plate 2 After leaving the pressure/conveyor belts 17 the honeycomb plate 2 is provided on both end wall surfaces with an adhesive layer consisting substantially of thermoplastic plastic which is covered in turn by the protective foil.
  • the honeycomb plate 2 is in this case fed to the coating rollers in a continuous form. These coating rollers 3 are driven by non-drawn means at a preselected speed.
  • the peripheral velocity of coating rollers 3 corresponds with the peripheral velocity of the conveyor rolls 16 and the speed of the pressure/conveyor belts 17.
  • the transporting speed of the honeycomb plate 2 hereby selected corresponds with a required submersion time of the plate 2 in the mixture 13 present in container 12.
  • Coating rollers 3 receive this solution 6, consisting of NMP and the thermoplastic plastic to be applied, via the transfer rolls 4 which roll through the solution 6 present in trays 5.
  • Closing off of cells of the honeycomb plate 2 may occur as a result of the coating treatment.
  • the treatment in the heat treatment station 8 is carried out in order to reopen such cells.
  • the subsequent treatment in the steam chamber 10 stabilizes the adhering layer which has partially penetrated into the material of the honeycomb plate 2.
  • washing out of the NMP takes place in the mixture present in the container. If only water were to be found in container 12, the NMP can then be for the most part removed so that there is virtually no longer any NMP present in the adhesive layer present on the honeycomb plate 2. For reasons to be indicated briefly hereinafter it is recommended that some NMP is still present in the adhesive layer to be formed. It is for this reason that the mixture 13 consisting of water and a desired quantity of NMP is preferably used.
  • a semi-manufacture consisting of a honeycomb plate 2, the end wall surfaces of which are provided with an adhesive layer consisting of the thermoplastic plastic and some NMP.
  • This plate can be immediately used to form a sandwich panel by laying an optionally fibre reinforced thermoplastic covering sheet against the plate on both sides and, using a suitable treatment, for example a heat treatment, an ultrasonic treatment and/or a treatment under pressure, by removing the NMP still present through diffusion, and joining the sheet to the honeycomb core.
  • the semi-manufacture is finished by arranging a protective foil on the sides provided with an adhesive layer.
  • the thus finished plate can be transported to a user who makes further use thereof in the manner described.
  • Fig. 2 shows a device 20. Parts corresponding to those as in fig. 1 are designated in this figure with the same reference numerals.
  • Steam chambers 21 comprise here an in-feed portion 22 and a discharge portion 23, which results in the steam passing along the coated surface in the manner indicated with the arrow 24.
  • the honeycomb plate 25 drops into a container 26 in which is to be found the mixture 13 as described above. After submersion for a sufficiently long period the plate is taken out of the container 26 and if required subsequently treated further.
  • Such an after treatment may comprise a drying process and if desired a finishing as described with reference to fig. 1.
  • honeycomb formed from Nomex paper, which is drenched in phenol resin and subsequently cured.
  • the weight of this type of honeycomb is 48 kg per cubic metre.
  • a honeycomb panel of this material is provided on both sides with a coating of polyetherimide dissolved in n-methylpyrrolidone.
  • the concentration of thermoplastic in the solution is 25%.
  • the coating is applied with a weight such that the amount of thermoplastic in the solution has a weight of 100 grams per side.
  • the coating is pre-dried for thirty minutes at a temperature of 240 degrees Celsius. Approximately 25% solvent will then be found in the coating.
  • the skin sheets are joined to the core in a flat press at a temperature of 170 degrees C and a pressure of one bar for a duration of ten minutes. In a peel test with a panel manufactured in this manner it is the core material that disintegrates and not the adhesive layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (8)

  1. Procédé d'application d'une couche adhésive consistant substantiellement en une matière plastique thermoplastique sur un corps, par exemple une plaque à nid d'abeilles qui peut constituer le coeur d'une structure sandwich avec des feuilles recouvrantes thermoplastiques,
    comprenant les étapes suivantes :
    (1) la fourniture d'un corps sur lequel ladite couche adhésive doit être appliquée;
    (2) la confection d'une solution de la matière plastique thermoplastique dans un premier solvant;
    (3) l'application de ladite solution sur la surface du corps comme revêtement;
    (4) l'élimination au moins partielle dudit premier solvant par introduction dudit corps dans un second solvant, dans lequel le matériau thermoplastique est substantiellement non soluble, et dans lequel ledit premier solvant est soluble, et le maintien dudit corps dans ce second solvant pendant une période suffisamment longue de sorte que ledit premier solvant soit éliminé en proportion suffisante de ladite surface dudit corps.
  2. Procédé tel que revendiqué dans la revendication 1, caractérisé par l'étape suivante :
    (5) l'exposition après l'étape (3) de la surface concernée du corps à une température accrue pendant une certaine durée.
  3. Procédé tel que revendiqué dans la revendication 2, caractérisé en ce que l'étape (5) est réalisée en utilisant de la radiation de chaleur.
  4. Procédé tel que revendiqué dans la revendication 2 ou 3, caractérisé en ce que l'étape (5) est réalisée en utilisant de la vapeur.
  5. Procédé tel que revendiqué dans les revendications 1 à 4, caractérisé par l'étape suivante :
    (6) l'addition préalable à l'étape (4) d'une quantité choisie du premier solvant au second solvant de sorte qu'une concentration désirée dudit premier solvant est retenue dans la couche adhésive résultante sur le corps.
  6. Procédé tel que revendiqué dans les revendications 1 à 5, caractérisé par les étapes suivantes :
    (7) la sélection d'un premier solvant qui a un point d'ébullition supérieur à celui du second solvant;
    (8) l'élimination au moins partielle dudit second solvant en soumettant la surface concernée du corps à une température qui est au moins de l'ordre de grandeur du point d'ébullition dudit second solvant.
  7. Procédé tel que revendiqué dans les revendications 1 à 6, caractérisé par l'étape suivante :
    (9) le choix de la n-méthylpyrrolidone comme premier solvant.
  8. Procédé tel que revendiqué dans les revendications 1 à 7, caractérisé par l'étape suivante :
    (10) le choix de l'eau comme second solvant.
EP88201236A 1987-07-14 1988-06-16 Méthode pour appliquer à un élément une couche d'adhésif thermoplastique Expired - Lifetime EP0300522B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88201236T ATE85905T1 (de) 1987-07-14 1988-06-16 Verfahren zum beschichten eines gegenstandes mit einem thermoplastischen kunstharzleim.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8701656 1987-07-14
NL8701656A NL8701656A (nl) 1987-07-14 1987-07-14 Werkwijze voor het aanbrengen van een thermoplastische hechtlaag op een lichaam.

Publications (2)

Publication Number Publication Date
EP0300522A1 EP0300522A1 (fr) 1989-01-25
EP0300522B1 true EP0300522B1 (fr) 1993-02-24

Family

ID=19850309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201236A Expired - Lifetime EP0300522B1 (fr) 1987-07-14 1988-06-16 Méthode pour appliquer à un élément une couche d'adhésif thermoplastique

Country Status (4)

Country Link
EP (1) EP0300522B1 (fr)
AT (1) ATE85905T1 (fr)
DE (1) DE3878603D1 (fr)
NL (1) NL8701656A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5328744A (en) * 1990-10-09 1994-07-12 E. I. Du Pont De Nemours And Company Panel having a core with thermoplastic resin facings
GB9405947D0 (en) * 1994-03-25 1994-05-11 Kodak Ltd Replenishment of processes
TW305870B (fr) * 1994-04-28 1997-05-21 Minnesota Mining & Mfg
US5976690A (en) * 1995-05-18 1999-11-02 3M Innovative Properties Company Opaque adhesives and method therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE550803A (fr) * 1955-09-06
GB961785A (en) * 1962-06-28 1964-06-24 Ciba Ltd Manufacture of honeycomb structures

Also Published As

Publication number Publication date
EP0300522A1 (fr) 1989-01-25
NL8701656A (nl) 1989-02-01
DE3878603D1 (de) 1993-04-01
ATE85905T1 (de) 1993-03-15

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