WO1992005021A1 - Procede et dispositif de fabrication d'une plaque rigide a base de paille ou d'un materiau similaire - Google Patents

Procede et dispositif de fabrication d'une plaque rigide a base de paille ou d'un materiau similaire Download PDF

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Publication number
WO1992005021A1
WO1992005021A1 PCT/DK1991/000286 DK9100286W WO9205021A1 WO 1992005021 A1 WO1992005021 A1 WO 1992005021A1 DK 9100286 W DK9100286 W DK 9100286W WO 9205021 A1 WO9205021 A1 WO 9205021A1
Authority
WO
WIPO (PCT)
Prior art keywords
binding agent
straw
foaming
layer
injection
Prior art date
Application number
PCT/DK1991/000286
Other languages
English (en)
Inventor
Svend Erik DJERNÆS
Ejvind Sand DJERNÆS
Original Assignee
Djernaes Svend Erik
Djernaes Ejvind Sand
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 Djernaes Svend Erik, Djernaes Ejvind Sand filed Critical Djernaes Svend Erik
Priority to EP91916828A priority Critical patent/EP0605413A1/fr
Priority to CA002119768A priority patent/CA2119768A1/fr
Priority to DE4192311T priority patent/DE4192311T1/de
Publication of WO1992005021A1 publication Critical patent/WO1992005021A1/fr

Links

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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/461—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/005—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and foam
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/328—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the foamable components being mixed in the nip between the preformed parts
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/329—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being partially embedded
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers

Definitions

  • a method and a system for manufacturing a rigid plate material of straw or a similar raw material A method and a system for manufacturing a rigid plate material of straw or a similar raw material.
  • the present invention relates to a method of manufacturing a rigid plate material of straw or a similar raw material, based on a bonding together of the raw material by means of a foaming binder agent.
  • the desired material can of course hardly be produced without the use of pressure, but according to the invention the pressing treatment will not have to be effected in an active manner, but can be effected passively when a foaming binding agent is used, insofar as an interior foaming produces a compression pressure, if the expanding workpiece is confined between opposed rigid moulding walls. Then it will be sufficient to introduce the loose raw material with admixed foaming binder agent in a production tunnel, in which the material expands so as to contact respective bottom and ceiling surfaces in the tunnel, such that the expansion will be purely structurally limited to far less the potential free expansion, i.e. with an associated building up of an interior compression force in the workpiece without any corresponding and energy consuming pressing operation on the workpiece being required.
  • the starting material when the starting material is loose straw it will be actual to lay up a straw layer having a thickness well larger than the desired plate material thickness and then cause the layer to be pressed together into the latter thickness, by which the straw material should be reasonably compact.
  • This pressing together can easily be worked out without any substantial power, and it is not comparable to a real production pressing. Upon this compaction the straw layer will be ready for easy introduction into the rigid production tunnel.
  • foaming binder agent It is important to use only a small amount of the foaming binder agent, because preferably there should be no free foam in the final product. This is a known recognition, as the foam substance acts as a binder and not as an independent strength giving component, such that any free foam will incur the possibility of breaking areas. When thus only a small amount of the foaming agent is to be used it will be that more important to arrange for an extraordinary even distribution of the agent in the matrix, and there are several indications of exactly this condition being responsible for the general failure of the prior art proposals.
  • the binding agent In the prior art the required even distribution of the binding agent has been arranged by adding the agent to the base material under thorough agitation of the latter. This inevitably takes some time, and for common, cheap foaming agents this will imply that the agent will start expanding already prior to the mixing agitation being concluded. Thereby, during some few minutes, a certain free foaming up will occur on the surface portions of the base material, and therewith the effect of the expansion of the foaming agent during the following pressing phase will be noticeably reduced. Ideally the binding agent should not start any significant foaming until the expansion can take place against an outer pressure, because then it will be achieved that the expansion will also be directed 'inwardly in the material, for a sort of impregnation thereof.
  • the material is brought to fill out the space between the bottom and the ceiling of the production tunnel, and by its further expansion this agent will build up an interior pressure in the material, whereby the foaming agent already in the initial phase will get an opportunity to intrude into and forwardly through the material portions located between the injection areas, such that the binding agent so to speak distributes itself evenly in the material by its own expansion effect.
  • This distribution will take place both in the width direction, between the injection areas, and in the depth direction, inwardly into the basis material, such that both the desired even distribution and the desired impregnation effect will be obtained.
  • a layer of loose material is arranged on a carrier surface and is compacted into a layer having a thickness approximately corresponding to the height of the production tunnel, preferably 15-20 cm, and that this material layer is subjected to a multispot injection of the foaming binding agent immediately prior to the layer being introduced into the tunnel.
  • this may be effected in a rather simple manner, viz. by arranging of a spear injection of the binding agent through several spears mounted in a transverse row across the layer of the loose material, while his layer is advanced longitudinally, the spears being moved up and down such that during the advancing of the layer they will bring the binding agent into the layer in transverse rows with a small mutual distance.
  • the material layer is laid up based on entirely loose straw, e.g. raked from a straw bale and optionally deposited on a moving belt, such that a good bond in the material and a uniform material filling can be ensures throughout the workpiece.
  • the injection of the binding agent may be effected in the loose material or with the material in a more or less compacted condition, optionally by introduction of the spears through holes or slots in one or both of the pressed walls.
  • the agent By the subsequent expansion of the binding agent inside the production tunnel the agent will intrude into the base material, both in the depth and in the width thereof, such that a uniform distribution will be achieved.
  • the produced foam will fill out all cavities in the base material, but as described it will also penetrate into the material itself and be uniformly distributed therein, as it will not be able to produce any substantial expansion of the base material, when the latter is held between the floor and the ceiling side of the production tunnel.
  • the required expansion force is created internally.
  • the binding foam will be fully set, and the plate member may then (or even shortly before) be taken out of the production tunnel.
  • the invention also comprises the described means for carrying out the disclosed method.
  • a production system according to the invention is shown in a schematic perspective view.
  • the system shown comprises a belt conveyor 2 having mounted above its inlet end a unit 4 for dropping loose straw onto the conveyor belt.
  • the unit 4 is shown fully schematically, as it is unimportant how it is designed; it may be outlet of a machine for rasping straw bales and delivering the straw in a fully loose, optionally very coarsely cut condition.
  • the straw is deposited on the belt 2 in a layer 6, e.g. with a height of 1-1,5 m, and this layer is advanced towards an overlying, downwardly inclined conveyor belt 8, which will thus act to press together the loose straw layer for delivery thereof with a thickness of e.g. 15-20 cm.
  • This delivery takes place to a tunnel 10 in a press tube 12, into which the compacted straw layer can be introduced merely by the action of the conveyor belts 2 and 8, though if required these belts may be provided with e.g. knoblike protrusions.
  • an injector unit 14 comprising a carrier beam 16 for a number of downwardly projecting tube spears 18, connected with a supply hose 20 for a foaming binding agent.
  • the beam 16 is supported by cylinders 22 which are operable to rapidly move the spears 18 into the straw layer 6 and retract them therefrom.
  • the cylinders 22 may be mounted for a limited longitudinally reciprocating movement, whereby they can carry out their injection movement while the straw layer is being moved on the conveyor 2.
  • the dosing of binding agent through the spears may be controlled such that the agent is injected e.g. only during each retraction movement of the spears.
  • the supplied amount of binding agent should be kept very low, as in the final product the expanded foam should be present with a volume percentage of 2-3%. Inasfar as each volume unit of the liquid, foaming agent may expand to a volume some 35 times as big it really is required to keep the injection of the foam liquid very low.
  • the supply unit may operate almost continuously while the expansion and setting process in the single tubes is going on, e.g. during 10-15 minutes. Thereafter the finished plate elements may be removed from the press tubes, preferably by these being openable for an easy release of the plate elements.
  • the supply unit may well be adapted to operate intermittently, e.g. with the inclined conveyor 8 replaced by a horizontal piston plate, which by each operation may compress the entire length of the loose straw layer that is to be introduced into an applied press tube.
  • the injection of the binding agent may be effected even after the initial compaction of the loose straw layer, e.g. by a horizontal introduction of the spears underneath the inclined conveyor 8.
  • the foaming binding agent liquid may be applied in an atomized condition already by the laying out of the loose straw material on the belt 2, such that a good distribution of the agent is achieved briefly before the material is introduced into the press tunnel 10.
  • volume percentage of the binding foam should be 2-3%, which will be optimal.
  • the invention will comprise an addition within somewhat broader limits, viz. 1-5%.
  • the compaction of the loose material may be achieved by displacing downwardly the upper press plate, which is thereafter locked in its lower position so as to thereafter act as a ceiling in the press tunnel as thus integrally connected therewith.
  • the plate is raised again, when the plate material is ready for delivery, whereby also the delivery is facilitated.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Cosmetics (AREA)
  • Laminated Bodies (AREA)

Abstract

Les essais de fabrication précédents de matériaux formés d'une plaque de paille de bonne qualité et économiques, ont généralement échoués, même dans le cas d'un mélange de la paille avec un agent liant approprié, constitué par un plastique liquide moussant. L'invention se rapporte à des résultats améliorés, dus au fait de ne pas mélanger la paille avec l'agent liant dans le sens normal du mot mélanger, mais en injectant l'agent liant dans la couche de paille (6) immédiatement avant de placer ladite couche précomprimée dans une presse en tunnel rigide (10) possédant l'épaisseur de plaque désirée et conçue pour résister à la pression de dilatation produite par la mousse de l'agent liant qui se forme ensuite. De ce fait, l'agent liant sous forme de mousse va s'imprégner dans la paille et on obtiendra de très bons résultats sans soumettre le matériau à une compression consommatrice d'énergie.
PCT/DK1991/000286 1990-09-21 1991-09-23 Procede et dispositif de fabrication d'une plaque rigide a base de paille ou d'un materiau similaire WO1992005021A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP91916828A EP0605413A1 (fr) 1990-09-21 1991-09-23 Procede et dispositif de fabrication d'une plaque rigide a base de paille ou d'un materiau similaire
CA002119768A CA2119768A1 (fr) 1990-09-21 1991-09-23 Procede et installation pour la fabrication de panneaux rigides en paille ou autres matieres semblables
DE4192311T DE4192311T1 (de) 1990-09-21 1991-09-23 Verfahren und Vorrichtung zur Herstellung eines festen Plattenmaterials aus Stroh oder einem ähnlichen Rohmaterial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK227690A DK171314B1 (da) 1990-09-21 1990-09-21 Fremgangsmåde og anlæg til fremstilling af fast plademateriale af halm eller tilsvarende råmateriale

Publications (1)

Publication Number Publication Date
WO1992005021A1 true WO1992005021A1 (fr) 1992-04-02

Family

ID=8111274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1991/000286 WO1992005021A1 (fr) 1990-09-21 1991-09-23 Procede et dispositif de fabrication d'une plaque rigide a base de paille ou d'un materiau similaire

Country Status (6)

Country Link
EP (1) EP0605413A1 (fr)
AU (1) AU8612891A (fr)
CA (1) CA2119768A1 (fr)
DE (1) DE4192311T1 (fr)
DK (1) DK171314B1 (fr)
WO (1) WO1992005021A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007128534A2 (fr) * 2006-05-08 2007-11-15 Dirk Dammers Plaque, notamment panneau d'habillage de murs ou de plafonds ou servant de revêtement de sols, et procédé de fabrication d'une plaque
WO2012042027A1 (fr) * 2010-10-01 2012-04-05 Doka Industrie Gmbh Matériau composite en bois renforcé
EP2487016A1 (fr) * 2011-02-14 2012-08-15 Dascanova GmbH Procédé et appareil pour la production d'un élément de type particule
EP3130714A1 (fr) 2015-08-14 2017-02-15 Strohplus G.m.b.H. Plaque isolante
DE102020114647A1 (de) 2020-06-02 2021-12-02 Bachata Stiftung Dämmstoffmatte
DE102020125925A1 (de) 2020-10-04 2022-04-07 Bachata Stiftung Natur-Matratze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113650125A (zh) * 2021-07-12 2021-11-16 厦门画倾言贸易有限公司 一种农作物秸秆的综合利用系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Dialog Information Services, File 350, World Patent Index 63-80, Dialog Accession No. C68-Q42333, STRAMIT BOARDS LTD: "Composite building board of compressed straw and plastics foam - is light, handles easily and has an indentation-resistant surface"; AU,A,6719560, 690918, 6800 (Basic). *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007128534A2 (fr) * 2006-05-08 2007-11-15 Dirk Dammers Plaque, notamment panneau d'habillage de murs ou de plafonds ou servant de revêtement de sols, et procédé de fabrication d'une plaque
WO2007128534A3 (fr) * 2006-05-08 2008-03-13 Dirk Dammers Plaque, notamment panneau d'habillage de murs ou de plafonds ou servant de revêtement de sols, et procédé de fabrication d'une plaque
WO2012042027A1 (fr) * 2010-10-01 2012-04-05 Doka Industrie Gmbh Matériau composite en bois renforcé
EP2487016A1 (fr) * 2011-02-14 2012-08-15 Dascanova GmbH Procédé et appareil pour la production d'un élément de type particule
EP3130714A1 (fr) 2015-08-14 2017-02-15 Strohplus G.m.b.H. Plaque isolante
DE102020114647A1 (de) 2020-06-02 2021-12-02 Bachata Stiftung Dämmstoffmatte
DE102020125925A1 (de) 2020-10-04 2022-04-07 Bachata Stiftung Natur-Matratze

Also Published As

Publication number Publication date
DK227690A (da) 1992-03-22
DK171314B1 (da) 1996-09-02
EP0605413A1 (fr) 1994-07-13
DE4192311T1 (de) 1994-04-28
CA2119768A1 (fr) 1992-04-02
AU8612891A (en) 1992-04-15
DK227690D0 (da) 1990-09-21

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