AU615452B2 - Insulating panel - Google Patents

Abstract

In the process disclosed, pulp mixed in a dosing device is introduced into the pre-shaping device (1) on an endless shaping web (3), for example a papermaking machine wire web, which serves successively for support and drainage of the pulp during pressing and pre-shaping and as a means for handling the pre-shaped board to remove it from the pre-shaping device (1). The pre-shaped board is then introduced into a tunnel furnace (5) with double-sided percussion in which the hot air at a temperature of 185 to 200 DEG C is blown forcibly and very uniformly onto the two faces of the board to be dried.

Description

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DPI DATE 24/11/89 APPLN. I D 18065 88 AOJP DATE 21/12/89 PCT NUMBER PCT/BE88/00013 CT ORGANi' n6 i 4 2 DENIANDE INTERNATIONALE PUBLIF EN VERTU DU TRAITE DE COOPERATION EN MATIERE DE BREVETS (PCT) (51) ClaESification internationale des brovets 4 (11) Numero 'de pubiation Internationale: WO 89/10449 D21J 1/00, 1/20, 3/12 Al (43) Date de publica!ion Internationale: 2 novembre 1989 (02.11.89) (21) Numiro de la demande internationale: PCT/BE88/00013 Publiie (22) Date de d~p~t international: 29 avril 1988 (29.04.88) Aiec rapport de recherche internationale.

(71) D~posant (pour tous les Etats d~sign~s sauf US): TERRE ENGINEERING S.A. [BE/BE]; Parc Industriel des Hauts Sarts, B-4400 Herstal (BE).

(72) Inventeur; et Inventeur/Diposant (US seulernent) WAUTERS, William [BE/BE]; i, place Communale, B-4470 Vivegnis (BE).

(74) Mandataire: DELLICOUR, Paul; Office de brevets E.

Dellicour, Rue Fabry 18/0 12, B-4000 Liege (BE).

(81) Etats disign~s: AT (brevet europ~en), AU, BE (brevet europ~ea), CH (brevet europ~en), DE (brevet europ~en), FR (brevet !?urop~en), GB (brevet europeen), IT (brevet europ~en), JP, LU (brevet europ~en), NL_ (brevet europ~ep), SE (brevet europ~en), SU, US.

(54)Tltle: PROCESS FOR MANUFACTURING HEAT-INSULkTING AND SOUNDPROOFING BOARDS AND SOUNDPROOFING MATERIALS AND BOARDS SO OBTAINED (54)Titre: PROCEDE DE FABRICATION DE PANNEAUX !SOLANTS, THERMIQUES FT ACOUSTIQUES, ET AB-.

SORBANTS PHONIQUES FT PANNEAUX REALISES SUIVANT L E PROCEDE (57) Abstract In the process disclosed, mixed in a dosing device is introduced into the pre-shaping device on an I. endless shaping web for examp~e a 67 papermaking machine wire web, which serves successively for support and drainage of the pulp during pressing and pre-shaping and as a means for handling the pre-shaped board to remove it from the pre-shaping device to The pre-shaped board is then introduced into a tunnel furnace with doublesided percussion in which the hot air at a temperature of 185 to 200'C is blown forcibly and very uniformly onto the two faces of the board to be dried.

Abr~g6 Suivant le proc~d6 de fabrication de panneaux isolants: 1) la pAte homog~n~is~e provenant d'un doseur est amen~e dans Ia pr~formeuse sur une toile sans fin de formation du type toile de formation de papeterie, servant successivement au sup.

port et Ai 1'&gouttage de la piite lors du pressage et du prfformage et de moyen de manutention du panneau pr~form6 Pour son 6vacuation hors de la pr~formeuse 2) le panneau pr~form6 est introduit daiis un four tunnel Ai percussion double face, l'air chaud 6tant souff 16 sur les deux faces du panneau Ai s~cher d'une mani~re forc~e et trks uniforme A une temp~rature comprise entre 185'C et 200'C.I

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VERiFiED TRANSLATION OF' 160^ /8 A method of and an apparatus for producing heat and sound insulating panels and soundproofing substances and also panels produced by the said method The present invention relates to insulating panels made from raw materials which have been recycled or which are in prime condition, consisting of cellulose fibre and agglomerated vegetable waste and more particularly straw and paper in bulk or in bales and emanating from selective crops.

The production of this type of panel, according to the Patent EP-A-0 084 917, is performed in a single shaping operation under very low pressure of around 1 kg/sq.cm on a pulp originating from the preparation of cellulose fibres and vegetable waste mixed with a suitable quantity of water in a machine referred to as a 'preforming' machine. This shaping is followed by drying in a continuous oven which leaves a quantity of air cavities intended to impart the required properties to the panel.

The object of the invention is to invest in the method as described hereinabove new characteristic properties which improve the various phases of the process and make it possible to obtain a dry self-supporting felted material which will not break, is not deformed and will withstand a compression stress of 160 KN/sq.m with a maximum deformation of To achieve this object, the method of producing insulating panels according to the invention is characterised in that: ML 0 I 2 ""~iOi TRANSLATIOt OF 0 /88 2 1. The homogenised pulp emanating from a dispenser is conveyed into the preforming machine on an endless i shaping wire cloth of the paper-making type which serves successively to support and drain the pulp during pressing and preforming and as a means of handling the preformed panel and of removing it from the preforming machine 2. The preformed panel is introduced into a tunnel oven of the double-sided percussion type, the hot air being blown onto both faces of the panel to be dried in a forced and very uniform fashion at a temperature comprised between 1850C and 200 0

C.

Again according to the invention, the drive and automatically calibrated panel covered on each side with glue and a layer of cardboard is introduced into a heating press which simultaneously hardens the glue and produces an indentation around the perimeter of the panel.

Further characteristic features will become apparent from the ensuing description, which is based on the accompanying drawings in which: Figs. 1A and 1B show in elevation the main phases of the operating diagram, and Fig. 2 is a partial view of the heating press on an enlarged scale.

At the outset, a panel according to the invention is, for example, produced from the following materials: straw, paper in bulk or in bales, mains water and drainage water, recycled chips emanating from the calibration and machining stages.

Using these materials, the pulp is prepared in a pulper, homogenised and then passed to a dispenser which feeds a

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7l yr. -5 I 3 preforming machine 1, in which the floating platen 2 is carried on an endless forming wire cloth 3 of the type used in paper making. The movable platen 3, operated by jacks, slides downwardly until the required pressure is reached, which will be around 1.1 kg/sq.cm to 4 kg/sq.cm. The wire cloth 3 serves to support the pulp and to drain it during pressing and preforming and also serves as a means of handling the preformed panel in order to remove it from the preforming machine and, using a raising-lowering means 4', transfer it rapidly to a two-speed conveyor 4.

The wire cloth 3 is driven by cylinders 1' which comprise suitable means for controlling displacement and centring.

These cylinders 1' are provided with a system of cleaning involving scraping and spraying on water. In order to distribute the compression stresses over the forming wire cloth 3, an intermediate perforated plate 3' is fixed on the grille which is attached to the preforming machine and the said wire cloth 3 slides over it.

The two-speed conveyor 4 slowly introduces the preformed panel into the tunnel oven 5 which is fitted with a plurality of staged conveyors which permit of production on several parallel levels 6. Drying in the oven is carried out under very accurately repetitive conditions aimed at eliminating a clearly defined percentage of water from the preformed panel and amounting to 65% to 75% in relation to the total weight of the cake. After drying, the water elimination leaves a number of air cavities which give the panel its heat and soundproofing properties as well as its felted strength. The continuous oven operates at a temperature of between 1850°C and 200°C and the hot air is distributed over both faces of the panel in a forced and very uniform manner at a velocity which is between 13 m/sec and 18 m/sec. The drying time will depend upon the thickness of the panel. The conditions required for drying 1 -4make it possible to obtain optimum treatment of the material and to preserve its properties throughout production.

The dry panels are discharged from a two-speed conveyor 7 (upwards-downwards displacing means automatically onto pallets or they are introduced directly by a belt conveyor 8 into a double-sided calibrator 9 in which the panel is automatically calibrated and sanded.

The calibrated panel is then passed to a palletiser, or to a gluing stage 10 or a stage 11 where it is covered with a layer of cardboard on each side before entering a heating press 12 which causes the glue to harden. Simultaneously, the perimeter of the panel is given an indentation in this heating press 12. The edges are thinned by compression in the form of a chamfer 4 cm to 6 cm wide and 2 mm to 4 mm deep on all four sides of the panel. This allows the u.3er to join the edges of the panels in an always sealing-tight and solid fashion by means of a strip of glass fibre glued into the hollow created by the chamfers on the two juxtaposed panels. Finishing is then quite straightforward, using a layer of filler and a finishing coat.

Forming of the chamfer in the heating press 12 which is intended for gluing the final surfacing on the panel is shown in Fig. 2, which shows the fixed heating platen 13 with a thicknessing wedge 14, the movable heating platen mounted on hydraulic jacks 16 and provided with a counterform 17 for shaping the chamfer, the panel 18 with the flue 19 and the surfacing material 20. The thinning of the edges of the panel and the polymerisation of the glue for gluing on the surfacing material are carried out in one single heat-pressing operation.

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as raw materials intended for producing panels. The term 'cellulose' is intended to designate either the cellulose emanating from old and mixed papers from selective crops, defibred with water in a conventional pulper to form a pulp, or the cellulose produced from vegetables such as papyrus, sugar cane trash, wood, leaves of banana trees and any fibrous vegetables of the same type defibred to form a pulp.

The term vegetable waste is intended to mean vegetable substances regarded as residues of manufacture such as coffee bean parchment, bran, rice bran, rice chaff and any other husks of grain, straw from cereals and rice, sawdust and wood chips.

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Claims (6)

1. 2. The preformed panel is introduced into a tunnel oven of the double-sided percussion type, the hot air being blown onto both faces of the panel to be dried in a forced and very uniform fashion at a temperature comprised between 185 0 C and 200°C. 2. A method of producing insulating panels according to Claim 1, characterised in that the preforming is carried out in one single operation at a pressure of 1.1 kg/sq.cm to 4 kg/sq.cm.
2. 3. A method of producing insulating panels according to Claim 1, characterised in that the endless forming wire cloth is driven by cylinders which permit control of its displacement and centring and slides over a perforated plate to distribute the compression stresses over the wire cloth
3. 4. A method of producing insulating panels according to Claim 1, characterised in that the preformed panel, prior to drying, contains a percentage of water amounting to around to 75% of the total weight of the cake. .4 i~- -7 A method for producing insulating panels according to claim 1, characterised in that in the tunnel oven the hot air is distributed at a velocity which is between 13 m/sec and 18 m/sec.
4. 6. A method of producing panels according to any one of claims 1 to 5, characterised in that the panel (18), dried, automatically calibrated in a double-sided sander-calibrater and covered on each face with glue (19) and a layer of cardboard (20) is introduced into a heating press (12) which simultaneously carries out polymerisation of the glue for adhesion of the surfacing material and the making of an indentation or chamfer over the perimeter of the panel by the provision of a matching shaping member (17) on the movable heating platen (15) of the press (12).
5. 7. An insulating panel having simultaneously intrinsic qualities of heat and sound insulation, crude, sanded, calibrated and/or covered with a surfacing material and produced according to the manufacturing process described 20 in any one of claims 1 to 6. 8 A method of producing insulating panels substantially as hereinbefore described with reference to the accompanying drawings.
6. 9. An insulating panel produced by the method of any one 25 of claims 1-7 substantially as hereinbefore described with reference to the accompanying drawings. DATED this 24 day of July 1991 TERRE ENGINEERING SA Patent Attorneys for the Applicant: F.B. RICE CO.