EP0819053B1 - A method for making expanded paper honeycomb core material moisture- or waterproof, and the thus obtained honeycomb core material - Google Patents

A method for making expanded paper honeycomb core material moisture- or waterproof, and the thus obtained honeycomb core material Download PDF

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Publication number
EP0819053B1
EP0819053B1 EP96907796A EP96907796A EP0819053B1 EP 0819053 B1 EP0819053 B1 EP 0819053B1 EP 96907796 A EP96907796 A EP 96907796A EP 96907796 A EP96907796 A EP 96907796A EP 0819053 B1 EP0819053 B1 EP 0819053B1
Authority
EP
European Patent Office
Prior art keywords
core material
honeycomb core
powder
paper
coating
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
EP96907796A
Other languages
German (de)
French (fr)
Other versions
EP0819053A1 (en
Inventor
Philippus Ludovicus Maria Diderich
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.)
Besin BV
Original Assignee
Besin BV
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 Besin BV filed Critical Besin BV
Publication of EP0819053A1 publication Critical patent/EP0819053A1/en
Application granted granted Critical
Publication of EP0819053B1 publication Critical patent/EP0819053B1/en
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
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D3/00—Making articles of cellular structure, e.g. insulating board
    • B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
    • B31D3/0292—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section involving auxiliary operations, e.g. expanding, moistening, glue-applying, joining, controlling
    • 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

Definitions

  • the invention relates to a method for making expanded paper honeycomb core material moisture- or waterproof, as well as the honeycomb core material obtained by using this method.
  • Paper honeycomb core material is often used as a stiff and light construction material. In a number of applications it is necessary for the paper honeycomb core material to be moisture- or waterproof, as for example in construction panels for outside use, for use in transport and for use in floors and such like. In these cases, the honeycomb core material is usually delivered in moisture- and waterproof condition, after which the user himself provides one or both sides of the honeycomb core material with a cover layer of plastic or metal, for example.
  • Paper honeycomb core material is obtained by glueing a number of strips of paper onto each other at certain places, and, after the glue has dried, expanding this parcel of paper by pulling the outer strips of paper apart laterally, thus obtaining the hexagonal cellular structure. After the expanded shape has been stabilized, the honeycomb core material is cut into slices of the desired thickness, which are further used as honeycomb core in honeycomb panels, for example.
  • Impregnation is effected by immersing the expanded honeycomb core material in a solution of formaldehyde and water.
  • immersion usually takes place a number of times in order to apply the desired amount of resin.
  • the impregnated honeycomb core material must be dried with the aid of a drying facility in order to remove the surplus of water from the honeycomb core material.
  • this aim is achieved by the measure that the honeycomb core material is provided with a coating after expansion.
  • the paper honeycomb core material is provided with a sealing layer that offers an effective protection against moisture and water.
  • the coating can be applied in one layer, so that repeated immersions are not necessary. Nor does formaldehyde have to be used any more.
  • a coating-paper-coating-sandwich is obtained, which produces a lighter and stronger construction as compared to impregnated paper.
  • This method is cheaper than the one in which strips of paper are provided with a coating before they are glued to one another and expanded, as less coating material is needed, that is not on the glued areas, and as the usual glues may be used.
  • expenses are saved because spoilage of honeycomb core material during production has not yet been provided with the cost price raising coating.
  • the coating is preferably applied as a powder of a polymer material, as, in this way, it is possible to apply a coating of essentially equal thickness across the entire length of the honeycomb cells within a short time.
  • powder is applied by providing the paper honeycomb core material and the powder with an opposed electric charge, as a result of which a predetermined amount of powder can be applied to the honeycomb core material simply and quickly, by allowing the honeycomb core material to attract the powder electrically.
  • Moistening is preferably carried out by sprinkling with water, preferably such an amount of water being used, that a degree of humidity equal to 15-30 percentage by weight of the honeycomb paper is obtained.
  • water preferably such an amount of water being used
  • thermosetting polyester or epoxy is preferably used, since a strong moisture- and waterproof coating can be made from a thermosetting polyester or epoxy or a mixture of the two.
  • the honeycomb core material is heated after the thermosetting powder has been applied, in order to let the powder turn into a hard and thick coating and to stabilize the coated honeycomb core material in the expanded state, in which the heating is preferably carried out by means of hot air or by infrared radiation in order to obtain quick and even heating.
  • the invention also relates to the paper honeycomb core material that is obtained with the method described above.

Landscapes

  • Laminated Bodies (AREA)
  • Panels For Use In Building Construction (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention relates to a method for making expanded paper honeycomb core material moisture- or waterproof, as well as the honeycomb core material obtained by using this method. According to the invention, the honeycomb core material is provided with a coating after expansion, the coating preferably being applied as a powder of a polymer plastic.

Description

  • The invention relates to a method for making expanded paper honeycomb core material moisture- or waterproof, as well as the honeycomb core material obtained by using this method.
  • Paper honeycomb core material is often used as a stiff and light construction material. In a number of applications it is necessary for the paper honeycomb core material to be moisture- or waterproof, as for example in construction panels for outside use, for use in transport and for use in floors and such like. In these cases, the honeycomb core material is usually delivered in moisture- and waterproof condition, after which the user himself provides one or both sides of the honeycomb core material with a cover layer of plastic or metal, for example.
  • Paper honeycomb core material is obtained by glueing a number of strips of paper onto each other at certain places, and, after the glue has dried, expanding this parcel of paper by pulling the outer strips of paper apart laterally, thus obtaining the hexagonal cellular structure. After the expanded shape has been stabilized, the honeycomb core material is cut into slices of the desired thickness, which are further used as honeycomb core in honeycomb panels, for example.
  • It is known to make the paper honeycomb core material moisture- and waterproof after expansion by impregnating the paper. Impregnation is effected by immersing the expanded honeycomb core material in a solution of formaldehyde and water. In the known processes immersion usually takes place a number of times in order to apply the desired amount of resin. After immersion, the impregnated honeycomb core material must be dried with the aid of a drying facility in order to remove the surplus of water from the honeycomb core material.
  • This way of making paper honeycomb core material moisture-and waterproof has a number of disadvantages. Formaldehyde is a poisonous substance that makes recycling or dumping difficult. Owing to the fact that immersion has to take place a number of times, the treatment is time-consuming and elaborate, which results in high process costs. Drying, at the end of the process, is an extra step in which the solvent with formaldehydefumes must be disposed of in a safe manner.
  • It is an aim of the invention to provide a method for making expanded paper honeycomb core material moisture- or waterproof which overcomes these disadvantages.
  • According to the invention, this aim is achieved by the measure that the honeycomb core material is provided with a coating after expansion.
  • This brings about, that the paper honeycomb core material is provided with a sealing layer that offers an effective protection against moisture and water. The coating can be applied in one layer, so that repeated immersions are not necessary. Nor does formaldehyde have to be used any more. By applying the coating a coating-paper-coating-sandwich is obtained, which produces a lighter and stronger construction as compared to impregnated paper. This method is cheaper than the one in which strips of paper are provided with a coating before they are glued to one another and expanded, as less coating material is needed, that is not on the glued areas, and as the usual glues may be used. In addition, expenses are saved because spoilage of honeycomb core material during production has not yet been provided with the cost price raising coating.
  • The coating is preferably applied as a powder of a polymer material, as, in this way, it is possible to apply a coating of essentially equal thickness across the entire length of the honeycomb cells within a short time.
  • In an advantageous embodiment of the method, powder is applied by providing the paper honeycomb core material and the powder with an opposed electric charge, as a result of which a predetermined amount of powder can be applied to the honeycomb core material simply and quickly, by allowing the honeycomb core material to attract the powder electrically.
  • In this case it is advantageous to moisten the paper honeycomb core material with water before the powder is applied, as this makes it easier to give the paper honeycomb core material a suitable electric charge.
  • Moistening is preferably carried out by sprinkling with water, preferably such an amount of water being used, that a degree of humidity equal to 15-30 percentage by weight of the honeycomb paper is obtained. By sprinkling, the paper easily and quickly acquires an even, suitable degree of humidity. It has been established that the stated degree of humidity achieves good results in practice.
  • For the polymer powder, a thermosetting polyester or epoxy is preferably used, since a strong moisture- and waterproof coating can be made from a thermosetting polyester or epoxy or a mixture of the two.
  • In an advantageous manner the honeycomb core material is heated after the thermosetting powder has been applied, in order to let the powder turn into a hard and thick coating and to stabilize the coated honeycomb core material in the expanded state, in which the heating is preferably carried out by means of hot air or by infrared radiation in order to obtain quick and even heating.
  • The invention also relates to the paper honeycomb core material that is obtained with the method described above.

Claims (10)

  1. A method for making expanded paper honeycomb core material moisture- or waterproof, characterized in that the honeycomb core material is provided with a coating after the expansion.
  2. A method according to claim 1, characterized in that the coating is applied as a powder of a polymer material.
  3. A method according to claim 2, characterized in that the powder is applied by providing the paper honeycomb core material and the powder with an opposed electric charge.
  4. A method according to claim 3, characterized in that the paper honeycomb core material is moistened with water before the powder is applied.
  5. A method according to claim 4, characterized in that the moistening takes place by sprinkling with water, preferably such an amount of water being used that a degree of humidity equal to 15-30 percentage by weight of the honeycomb paper is obtained.
  6. A method according to one of the claims 2 up to and including 5, characterized in that a thermosetting polyester or epoxy is used for the polymer powder.
  7. A method according to claim 6, characterized in that the honeycomb core material is heated after the thermosetting powder has been applied, in order to let the powder flow out into a hard and thick coating and to stabilize the coated honeycomb core material in the expanded state.
  8. A method according to claim 7, characterized in that the heating is carried out by means of hot air.
  9. A method according to claim 7, characterized in that the heating is carried out by means of infrared radiation.
  10. Paper honeycomb core material provided with a coating that is obtained by the method described in one of the above claims.
EP96907796A 1995-04-07 1996-04-09 A method for making expanded paper honeycomb core material moisture- or waterproof, and the thus obtained honeycomb core material Expired - Lifetime EP0819053B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1000088 1995-04-07
NL1000088A NL1000088C2 (en) 1995-04-07 1995-04-07 Method for rendering expanded paper honeycomb core material, and honeycomb core material obtained therewith, moisture- or water-resistant.
PCT/NL1996/000150 WO1996031339A1 (en) 1995-04-07 1996-04-09 A method for making expanded paper honeycomb core material moisture- or waterproof, and the thus obtained honeycomb core material

Publications (2)

Publication Number Publication Date
EP0819053A1 EP0819053A1 (en) 1998-01-21
EP0819053B1 true EP0819053B1 (en) 1999-06-02

Family

ID=19760850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96907796A Expired - Lifetime EP0819053B1 (en) 1995-04-07 1996-04-09 A method for making expanded paper honeycomb core material moisture- or waterproof, and the thus obtained honeycomb core material

Country Status (13)

Country Link
EP (1) EP0819053B1 (en)
KR (1) KR19980703682A (en)
CN (1) CN1184448A (en)
AU (1) AU5126696A (en)
BR (1) BR9604834A (en)
CA (1) CA2217658A1 (en)
DE (1) DE69602737T2 (en)
ES (1) ES2135220T3 (en)
HU (1) HUP9802331A3 (en)
MX (1) MX9707722A (en)
NL (1) NL1000088C2 (en)
PL (1) PL322718A1 (en)
WO (1) WO1996031339A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2186940A1 (en) 2008-11-14 2010-05-19 Rühl Puromer GmbH Method for continuous production of impregnated paper honeycomb

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE197265T1 (en) * 1996-07-30 2000-11-15 Swap Technology Ag CORRUGATED CARDBOARD CORE, METHOD AND DEVICE FOR PRODUCING SAME
CN1070415C (en) * 1996-12-20 2001-09-05 洪志修 Method for producing honey-comb like pressure resistant body jointing top and bottom plate
CN100448658C (en) * 2005-10-01 2009-01-07 陈明新 Process of producing honeycomb card board with waste paper product
DE102007034543B4 (en) 2007-07-20 2018-11-22 Fritz Egger Gmbh & Co. Og Method and device for producing a lightweight board and lightweight board
WO2015034479A1 (en) * 2013-09-04 2015-03-12 Halliburton Energy Services, Inc. Nano-carbohydrate composites as a lost circulation materials - lcm origami and other drilling fluid applications

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731379A (en) * 1953-04-21 1956-01-17 Union Bag & Paper Corp Method of making honeycomb material
US3519510A (en) * 1967-05-26 1970-07-07 Edward J Ardolino Formation of structural honeycomb
FR2171949A1 (en) * 1972-02-16 1973-09-28 Interlocking Systems Int Honeycomb core structure - with firm bond to end facing sheets
FR2568513B1 (en) * 1984-07-31 1986-11-14 Hexagone DRAWING-CALIBRATION PROCESS OF PAPER BAND WITH ALVEOLAR NETWORK AND MACHINE FOR IMPLEMENTING SAME

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2186940A1 (en) 2008-11-14 2010-05-19 Rühl Puromer GmbH Method for continuous production of impregnated paper honeycomb

Also Published As

Publication number Publication date
AU5126696A (en) 1996-10-23
KR19980703682A (en) 1998-12-05
NL1000088C2 (en) 1996-10-08
DE69602737T2 (en) 2000-03-09
EP0819053A1 (en) 1998-01-21
ES2135220T3 (en) 1999-10-16
DE69602737D1 (en) 1999-07-08
BR9604834A (en) 1999-01-05
CN1184448A (en) 1998-06-10
WO1996031339A1 (en) 1996-10-10
PL322718A1 (en) 1998-02-16
HUP9802331A3 (en) 1999-03-01
CA2217658A1 (en) 1996-10-10
MX9707722A (en) 1998-02-28
HUP9802331A2 (en) 1999-01-28

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