NO810576L

NO810576L - BYGNINSPLATE.

Info

Publication number: NO810576L
Application number: NO810576A
Authority: NO
Inventors: Rainer Simon; Peter Gutfleisch
Original assignee: Seelze & Eichriede Fulgurit
Priority date: 1980-02-25
Filing date: 1981-02-19
Publication date: 1981-08-26
Also published as: EP0034801A1; DK79581A; DE3007012A1

Description

Oppfinnelsen angår en bygningsplate som er frem-stillet av en fiber-bindemiddelblanding av trespon og sement med tilsetning av kjemikalier. The invention relates to a building board which is made from a fiber-binder mixture of wood shavings and cement with the addition of chemicals.

En kjent bygningsplate av denne art består av grov-spon og finspon som sammen med sement blandes med en liten vanntilsetning slik at blandingen blir så tørr at den etter-på ved spredning kan anbringes på plater, hvoretter de således dannede sjikt presses i en stabelpresse. A known building board of this kind consists of coarse shavings and fine shavings which, together with cement, are mixed with a small addition of water so that the mixture becomes so dry that it can be spread afterwards on boards, after which the layers thus formed are pressed in a stacking press.

En ulempe ved disse kjente bygningsplater er at inn-føring av ytterligere fibre særlig for å øke bøyefastheten og/eller ubrennbarhet, bereder vanskeligheter fordi de ytterligere fibre nøster seg sammen under blandingen, slik at det ikke kan fremstilles jevne plater med ønskede fast-hetsegenskaper. A disadvantage of these known building boards is that the introduction of additional fibers, particularly to increase the bending strength and/or non-flammability, creates difficulties because the additional fibers tangle together during the mixture, so that smooth boards with the desired strength properties cannot be produced.

Hensikten med oppfinnelsen er derfor å tilveiebringe en bygningsplate av den innledningsvis nevnte art hvis sammensetning ved enkel fremstilling av blandingen muliggjør tilsetning av ytterligere fibre. The purpose of the invention is therefore to provide a building board of the type mentioned at the outset whose composition enables the addition of additional fibers by simple preparation of the mixture.

Dette oppnås ifølge oppfinnelsen ved at blandingen består av en tørrblanding av ca. 5-12 vekt% fine trespon med en lengde på ca. 1-8 mm, ca. 77-85 vekt% sement, ca. 2-10 vekt% ytterligere fibre, og en vanntilsetning på ca. 80-400 vekt% av tørrblandingen. This is achieved according to the invention by the mixture consisting of a dry mixture of approx. 5-12% by weight fine wood shavings with a length of approx. 1-8 mm, approx. 77-85% by weight cement, approx. 2-10% by weight additional fibres, and a water addition of approx. 80-400% by weight of the dry mixture.

I en slik vanndig fiber-bindemiddelblanding kan også lengre ytterligere fibre innarbeides, fordi ved den .høye vannandel frembringes en støpbar blanding (velling) som fører til at ved blanding og innføring av de lengre ytterligere fibre vil disse ikke nøste seg. Særlig når den vanndige fiber-bindemiddelblanding ifølge oppfinnelsen gis ut på et omløpende filtbånd, vil særlig de ytterligere fibre rette seg inn slik at det oppnås forbedrede fasthetsegen-skaper for de fremstillede plater. In such an aqueous fiber-binder mixture, longer additional fibers can also be incorporated, because the high water content produces a pourable mixture (grout) which means that when the longer additional fibers are mixed and introduced, they will not unravel. In particular, when the aqueous fiber-binder mixture according to the invention is dispensed onto a revolving felt band, the further fibers will align themselves so that improved firmness properties are achieved for the manufactured boards.

På denne måte oppnås at til tross for anvendelse av det forholdsvis billige fyllmateriale 3 oppnås bygningsplater med meget god bøyefasthet, i første rekke på grunn av andelen ytterligere fibre. In this way, it is achieved that despite the use of the relatively cheap filler material 3, building boards with very good bending strength are obtained, primarily due to the proportion of additional fibres.

Vannandelen i den vanndige fiber-bindemiddelblanding er avhengig av vannbehovet for de enkelte bestanddeler og dermed av vekt% av disse bestanddeler i tørr-blandingen. Vannandelen er i et hvert tilfelle beregnet slik at det alltid oppnås en støpfoar blanding. The proportion of water in the aqueous fiber-binder mixture depends on the water requirement for the individual components and thus on the weight % of these components in the dry mixture. The proportion of water is calculated in each case so that a pourable mixture is always obtained.

Det er særlig fordelaktig når de ytterligere fibre er glassfibre og/eller cellulosefibre og/eller kunststoff-fibre og/eller stenullfibre med en større lengde som imidler-tid bestemmes av fibermaterialet. Fortrinnsvis har glass-fiberne en lengde på 10-20 mm, cellulosefiberne en lengde på 5-12 mm og kunststoffiberne en lengde på 6-10 mm. It is particularly advantageous when the additional fibers are glass fibers and/or cellulose fibers and/or synthetic fibers and/or rock wool fibers with a greater length which is however determined by the fiber material. Preferably, the glass fibers have a length of 10-20 mm, the cellulose fibers a length of 5-12 mm and the synthetic fibers a length of 6-10 mm.

En ytterligere fasthetsøkning av en bygningsplate ifølge oppfinnelsen oppnås ved anvendelse av fine trespon særlig også av den grunn at grove spon ikke er så lett å fordele jevnt i platetverrsnittet som finere spon. A further increase in the strength of a building board according to the invention is achieved by using fine wood shavings, particularly also for the reason that coarse shavings are not as easily distributed evenly in the board cross-section as finer shavings.

Ut over dette har bygningsplaten ifølge oppfinnelsen sammenlignet med andre kjente byggeplater som består av cellulosefibre og sement, den fordel at den er vesentlig billigere,fordi cellulosefiberne koster det dobbelte til det tredobbelte av fine trespon. In addition to this, the building board according to the invention, compared to other known building boards which consist of cellulose fibers and cement, has the advantage that it is significantly cheaper, because the cellulose fibers cost twice to three times as much as fine wood shavings.

En ytterligere fordel ved byggeplaten ifølge oppfinnelsen består i at alt etter størrelsen av andelene av mineralske fibre særlig glassfibre, kan ubrennbarheten av platen økes. A further advantage of the building board according to the invention is that, depending on the size of the proportion of mineral fibres, particularly glass fibres, the non-flammability of the board can be increased.

Det er fordelaktig når tørrblandingen tilsettes kjemikalier med en andel inntil 1 vekt%, hvilket særlig tjener til å akselerere herdningen av sementen. It is advantageous when chemicals are added to the dry mixture in a proportion of up to 1% by weight, which serves in particular to accelerate the hardening of the cement.

En ytterligere besparelse ved bygningsplatenA further saving in the building plate

ifølge oppfinnelsen består i at en del av sementen kan erstattes med anorganiske tilslag såsom kalkstenmel, elektrofilteraske, slagg eller lignende. Det kan da an-vendes et slikt tilslag inntil 50 % av sementandelen. Foruten besparelsen ved anvendelse av slike tilslag, oppnås den ytterligere fordel at ved opprettholdt fasthet vil utvidelse og krympning som følge av fuktighetsopptak resp. fuktighetsavgivelse minskes, og bøyning eller vrid-ning av bygningsplaten unngås. according to the invention consists in that part of the cement can be replaced with inorganic aggregates such as limestone flour, electrostatic precipitator ash, slag or the like. Such an aggregate can then be used up to 50% of the cement proportion. In addition to the savings when using such aggregates, the further advantage is achieved that when firmness is maintained, expansion and shrinkage as a result of moisture absorption resp. moisture release is reduced, and bending or twisting of the building board is avoided.

En fordelaktig fremgangsmåte til fremstilling av bygningsplater ifølge oppfinnelsen består i at den av fine trespon, sement, ytterligere fibre og vann dannede vanndige fiber-bindemiddelblanding ved hjelp av en fordeler direkte påføres et omløpende filtbånd, hvoretter den således dannede fibermasse deles opp i enkelte avsnitt som tas av filtbåndet og anbringes i en stabelpresse for avvanning og komprimering. An advantageous method for the production of building panels according to the invention consists in the aqueous fiber-binder mixture formed from fine wood shavings, cement, additional fibers and water being directly applied to a rotating felt belt by means of a spreader, after which the fiber mass thus formed is divided into individual sections which is removed from the felt belt and placed in a stack press for dewatering and compaction.

På denne måte kan bygningsplater ifølge oppfinnelsen fremstilles ved en forholdsvis enkel langfiltmetode hvor-ved mellombearbeidelse unngås. De kjente av trespon og sement bestående bygningsplater krever nemlig en spredning i tørr tilstand på presseblikk som i en mellombearbeidelse utsettes for press i en stabelpresse under anvendelse av en innspenningsramme inntil fjærvirkningen av fiberne er overvunnet. Etter passering gjennom herdekammeret utsettes platestabelen ved den kjente fremgangsmåte for for-nyet press. Disse mellominnlagte arbeidsoperasjoner unngås ved bygningsplaten ifølge oppfinnelsen, idet enkeltav-snittene av den våte blanding på filtbåndet straks kan presses for avvanning og komprimering. In this way, building boards according to the invention can be produced by a relatively simple long felt method whereby intermediate processing is avoided. The known building boards consisting of wood shavings and cement require spreading in a dry state on pressed tin which in an intermediate processing is subjected to pressure in a stacking press using a clamping frame until the spring effect of the fibers is overcome. After passing through the curing chamber, the plate stack is exposed by the known method for renewed pressure. These intermediate work operations are avoided with the building board according to the invention, as the individual sections of the wet mixture on the felt tape can be immediately pressed for dewatering and compaction.

Fremgangsmåten til fremstilling av bygningsplatene ifølge oppfinnelsen utføres således meget billigere enn ved fremstillingen av de kjente plater. The method for producing the building boards according to the invention is thus carried out much more cheaply than in the production of the known boards.

Claims

1. Building board which is made from a fiber-binder mixture of wood shavings and cement for the addition of chemicals, characterized in that the mixture consists of a dry mixture of approx. 5-12% by weight fine wood shavings with a length of approx. 1-8 mm, approx. 77-85% by weight cement, approx. 2-10% by weight additional fibres, and a water addition of approx. 80-400% by weight of the dry mixture.

2. Building board according to claim 1, characterized in that the aqueous fiber binder mixture forms a castable mixture (grout) whose water proportion is dependent on the water requirements of the other components.

3. Building board according to claims 1 and 2, characterized in that the additional fibers are glass fibers and/or cellulose fibers and/or synthetic fibers and/or rock wool fibers.

4. Building board according to claim 3, characterized in that the glass fibers have a length of 10-20 mm, the cellulose fibers have a length of 5-12 mm and the plastic fibers have a length of 6-10 mm.

5. Building board according to one of the preceding claims, characterized in that up to 1% by weight of chemicals has been added to the dry mixture.

6. Building board according to one of the preceding claims, characterized in that the cement is replaced by inorganic aggregates such as limestone flour, electrostatic precipitator ash, slag or the like.

7. Building board according to claim 6, characterized in that up to 50% of the cement is replaced by aggregate.

8. Method for the production of building boards according to one of the preceding claims, characterized in that the aqueous fiber-binder mixture formed from fine wood shavings, cement, additional fibers and water is directly applied to a rotating felt band by means of a spreader, after which the fiber mass thus formed is divided up into individual sections which are removed from the felt belt and placed in a stack press for dewatering and compaction.