DK159941C

DK159941C - ELEMENTS FOR INSULATING ISAER CRUDE PIPES

Info

Publication number: DK159941C
Application number: DK602888A
Authority: DK
Inventors: Arne Staugaard
Original assignee: Rockwool Int
Priority date: 1987-11-06
Filing date: 1988-10-28
Publication date: 1993-02-22
Also published as: DK602888D0; DK602888A; DK159941B

Description

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Den foreliggende opfindelse angår et element til rørisolering og af den i indledningen til krav 1 angivne art.The present invention relates to an element for pipe insulation and of the kind specified in the preamble of claim 1.

Mineraluld har forskellig sammentrykkelighed i for-5 skellige retninger, der hovedsagelig er bestemt af de forhold, hvorunder mineralulden blev opsamlet under dens fremstilling. Mineraluldens fibre ligger nemlig hovedsagelig orienteret i planer, der er parallelle med det sibånd, hvorpå de efter trækningen luftbårne fibre blev aflejret.Mineral wool has different compressibility in different directions, mainly determined by the conditions under which the mineral wool was collected during its manufacture. The fibers of the mineral wool are mainly oriented in planes parallel to the ribbon on which the airborne fibers were deposited after the drawing.

10 Ved at fremstille rørisoleringslementet af ringformede legemer, hvis fibre hovedsageligt er orienteret i ringens plan, vil elasticiteten i hovedsagen være orienteret parallelt med ringens akse, og samtidig vil legemerne have den største modstandsevne mod sammentrykning i radial retning.By producing the tube insulating element of annular bodies, the fibers of which are mainly oriented in the plane of the ring, the elasticity will generally be oriented parallel to the axis of the ring, and at the same time the bodies will have the greatest resistance to compression in the radial direction.

15 Denne orientering af fibrene i de legemer, som isoleringselementet er opbygget af, bevirker, at mineraluldsisoleringen som sådan er i stand til at blive anbragt omkring krumme rør, hvis ikke den til sammenholdelse af de udskårne, sammenstillede legemer anvendte overfladebeklædning for-20 hindrede en sådan bøjning. Som det fremgår af svensk fremlæggelsesskrift nr. 315 776 har man forsøgt at forøge bøjeligheden ved at forsyne det arkmateriale, som udgør overfladebeklædningen, med en foldning ellier krepning, der i det væsentlige forløber i periferiretningen af mineralulds-25 legemerne.This orientation of the fibers in the bodies of which the insulating element is constructed causes the mineral wool insulation as such to be able to be placed around curved tubes, if the surface coating used for the comparison of the cut, assembled bodies does not prevent a such bending. As stated in Swedish Patent Specification No. 315,776, an attempt has been made to increase the flexibility by providing the sheet material constituting the coating with a folding or crepe which extends substantially in the circumferential direction of the mineral wool bodies.

Det har imidlertid i praksis vist sig, at det klæbestof, der anvendes til sammenføjningen mellem mineralulden og overfladebeklædningen, kort tid efter påføringen eller efter nogen tid hærder så meget, at den tilsigtede bøj-30 ning ikke lader sig gennemføre, idet overfladebeklædningen sammen med limlaget er blevet så stiv, at isoleringselementet i stedet for at bøjes jævnt omkring røret bøjes i skar- ' pe knæk, der opstår, hvor overfladebeklædningen foldes på samme måde, som et rør kollapser på under en for stor bøj-35 ningsspænding.However, it has been found in practice that the adhesive used for the bond between the mineral wool and the surface coating, shortly after application or after some time, cures so much that the intended bending is not feasible, with the surface coating together with the adhesive layer. has become so rigid that, instead of bending evenly around the tube, the insulating element bends into sharp bends which occur where the surface lining is folded in the same way that a tube collapses under too much bending stress.

Formålet med opfindelsen er at frembringe et rørisoleringselement, der ikke har denne ulempe. Formålet er således at tilvejebringe et isoleringselement, der selv efter 2The object of the invention is to provide a pipe insulating element which does not have this disadvantage. The purpose is thus to provide an insulating element which even after 2

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så lang tids oplagring, at limen er blevet hård og usmidig, vil bevare sin evne til at lade sig forme omkring en rørbøjning.so long storage that the glue has become hard and rigid will retain its ability to form around a pipe bend.

Dette formål opnås ved at isoleringselementet er ejendommeligt ved det i den kendetegnende del af krav 1 angivne .This object is achieved in that the insulating element is peculiar to that of the characterizing part of claim 1.

Ved at påføre limen i form af limpunkter i i det væsentlige parallelle rækker med en vis indbyrdes afstand vil beklædningen uhindret kunne foldes i mellemrummene mellem limstriberne, uanset om limen er hærdet så meget, at den nærmest er sprød. Der vil derfor kunne anvendes et bredt . udvalg af limtyper og så store mængder, at limen ved sammenføringen af mineraluldslegemerne med overfladebeklædningen trænger ind mellem de yderste fibre og derved sikrer en effektiv sammenklæbning mellem overfladebeklædningen og mineralulden i de på rækker beliggende limpunkter.By applying the glue in the form of glue points in substantially parallel rows with some distance between them, the cladding can be folded unobstructed in the spaces between the glue strips, regardless of whether the glue is hardened so that it is almost brittle. Therefore, a wide range can be used. selection of adhesive types and quantities so that the adhesive penetrates the outer fibers between the outer fibers and thereby ensures an effective adhesion between the surface coating and the mineral wool in the adhering points.

I henhold til opfindelsen kan limpunkterne være aflange striber og de kan endda være anbragt med så kort mellemrum, at de løber sammen til sammemhængende striber.According to the invention, the glue points may be elongated stripes and they may even be spaced so short that they coalesce into coherent stripes.

Den samme virkning opnås, hvis rækkerne eller striberne forløber i skrueform omkring de sammenstillede mineraluldslegemer. Det kan i tilfælde af, at der kun anvendes en enkelt dyse vise sig mere bekvemt at påføre limen på denne måde.The same effect is achieved if the rows or stripes extend in helical form around the assembled mineral wool bodies. In the case of using only a single nozzle, it may prove more convenient to apply the adhesive in this way.

For at opnå en passende høj grad af bøjelighed er det hensigtsmæssigt, at det af striberne dækkede areal på arkmaterialet udgør 10 - 70% af arkmaterialets areal.In order to obtain a suitably high degree of flexibility, it is desirable that the area covered by the strips on the sheet material constitutes 10 - 70% of the area of the sheet material.

En optimal bøjelighed opnås når afstanden mellem limstribernes midterlinier er ca. 22,5 mm, idet limstriberne ved påføringen er ca. 1,5 mm brede og ca. 1 mm høje. Med disse dimensioner kombineres en stor bøjelighed af isoleringselementet med en ringe tilbøjelighed til foldninger af beklædningen.Optimum flexibility is obtained when the distance between the center lines of the adhesive strips is approx. 22.5 mm, with the adhesive strips at the application being approx. 1.5 mm wide and approx. 1 mm high. With these dimensions, a great flexibility of the insulating element is combined with a low propensity for folding of the lining.

Opfindelsen skal i det følgende beskrives nærmere under henvisning til tegningen, på hvilken:The invention will now be described in more detail with reference to the drawing, in which:

Fig. 1 viser en række sammenstillede ringlegemer un-, der omviklingen med overfladebeklædningen under fremstil- 3FIG. 1 shows a series of assembled annular bodies, which are wrapped with the surface coating during manufacture 3

Fig. 2 viser bøjning af rørisoleringselementet ifølge opfindelsen.FIG. 2 shows the bending of the pipe insulating element according to the invention.

Det på fig. 1 viste rørisoleringelement består af en række sammenstillede legemer 1, der er udskåret af mineraluld, glasuld eller lignende fibermaterialer, hvis fibre er sammenbundet i en del af krydsningspunkterne ved hjælp af et bindemiddel, f.eks. en fenolharpiks, til en sammenhængende, halvstiv filt. Legemerne 1 er-udskåret af en plade af fibermaterialet på en sådan måde, at fiberfilten har sin største elasticetet i ringenes aksiale retning og størst stivhed i ringenes radialretning. Legemerne sammenstilles med fælles akse og tæt op mod hinanden i en længde på f.eks. 100 cm og forsynes derefter med en overfladebeklædning 2 af et arkmateriale, f.eks. papir. Det er hensigtsmæssigt, at papiret er forbehandlet på en sådan måde, at det har en stor bøjelighed i aksialretningen af de sammenstillede legemer, men denne forbehandling må dog ikke give arkmaterialet en sådan forøget stivhed vinkelret på denne akse, at det ikke lader sig svøbe omkring de sammenstillede legemer 1. Som eksempel på en sådan forbehandling kan nævnes krepning eller visse former for plissering. Andre arkmaterialer end papir er imidlertid også anvendelige. Der kan anvendes vævede eller uvævede tekstiler, der forsynes med en kachering eller pålægges en folie af plast eller metal. Som eksempler på anvendelige materialer kan nævnes creppet, bitumenbelagt papir og netforstærket aluraft. Inden arkmaterialet svøbes omkring de sammenstillede mineraluldslegemer 1, forsynes det med en række smalle striber af lim, der er i stand til at fastholde arkmaterialet til mineralulden. Limen kan være af hot-melttype eller være en solvent- eller vandbaseret lim. Limen bør have en sådan konsistens, at den er i stand til at trænge et stykke ind i mineralulden, men den bør kun i ringe omfang sprede sig i mellemrummet mellem arkmateriålet og mineralulden, således at det undgås, at limstriberne bliver væsentligt bredere end under påføringen. Når arkmaterialet svøbes omkring de sammenstillede mineraluldslegemer skal limfladerne danne smalle striber, der udgør 10 -70% af arkmaterialets areal.The FIG. 1 is a series of assembled bodies 1 which are cut from mineral wool, glass wool or similar fibrous materials, the fibers of which are joined together in a part of the crossing points by means of a binder, e.g. a phenolic resin, for a cohesive, semi-rigid felt. The bodies 1 are cut by a plate of the fiber material in such a way that the fiber felt has its greatest elasticity in the axial direction of the rings and the greatest stiffness in the radial direction of the rings. The bodies are aligned with a common axis and close to each other for a length of e.g. 100 cm and then provided with a surface coating 2 of a sheet material, e.g. paper. It is preferable that the paper be pretreated in such a way that it has a great flexibility in the axial direction of the assembled bodies, but this pretreatment must not give the sheet material such an increased rigidity perpendicular to this axis that it cannot be wrapped around the assembled bodies 1. An example of such pretreatment may be mentioned creping or certain types of pleating. However, sheet materials other than paper are also useful. Woven or nonwoven fabrics may be used that are cached or applied to a plastic or metal foil. Examples of usable materials include creped, bitumen coated paper and net reinforced alum. Before wrapping the sheet material around the assembled mineral wool bodies 1, it is provided with a series of narrow strips of glue capable of holding the sheet material to the mineral wool. The glue may be of hot-melt type or be a solvent- or water-based glue. The adhesive should have a consistency such that it is able to penetrate a bit into the mineral wool, but it should only spread to a small extent in the gap between the sheet material and the mineral wool, so that the adhesive strips are not significantly wider than during the application. . When the sheet material is wrapped around the assembled mineral wool bodies, the glue surfaces must form narrow strips that make up 10 -70% of the sheet material area.

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Forsøg med forskellige afstande mellem limstriberne har vist, at den optimale bøjelighed opnås med en afstand mellem midterlinierne på limstriberne på ca. 22,5 mm, idet limstriberne består af en hot-melt, der pålægges i ca. 1,5 5 mm brede og ca. 1 mm høje striber.Experiments with different distances between the adhesive strips have shown that the optimum flexibility is achieved with a distance between the center lines of the adhesive strips of approx. 22.5 mm, with the adhesive strips consisting of a hot melt applied for approx. 1.5 5 mm wide and approx. 1 mm high stripes.

I stedet for sammenhængende striber kan limen også påføres i form af rækker af punkter eller eventuelt rækker af efter hinanden følgende korte striber. Anvendelsen af punkter i stedet for striber giver svøbet større smidighed .10 ved bøjningen omkring mineraluldslegemerne og gør det færdige isoleringselement blødere og mere smidigt. På den anden side kan der med en lim> som i løbet af nogen tid hærder til et hårdt og forholdsvis stærkt og sejt materiale ved limpåførsel i sammenhængende striber opnås et system af 15 forstærkende ringe omkring mineralulden, hvorved isoleringselementerne opnår større styrke mod overlast efter opsætningen .Instead of continuous strips, the glue can also be applied in the form of rows of dots or possibly rows of consecutive short stripes. The use of points instead of stripes gives the wrapper greater flexibility .10 by bending around the mineral wool bodies and making the finished insulation element softer and more supple. On the other hand, with a glue> which cures for some time to a hard and relatively strong and tough material by glue application in continuous strips, a system of 15 reinforcing rings can be obtained around the mineral wool, whereby the insulating elements attain greater strength against overload after setting up. .

De ringformede mineraluldslegemer 1 kan på konventionel måde, inden de forsynes med svøbet 2 eller efter 20 svøbet er anbragt på plads, forsynes med gennemskæringer, der gør det muligt at åbne isoleringselementet, således at det kan anbringes omkring et rør.The annular mineral wool bodies 1 can, in conventional manner, be provided with the shroud 2 or after the shroud is placed in place, with cut-offs which allow the insulating element to be opened so that it can be placed around a pipe.

På grund af de med mellemrum placerede limstriber er det muligt at anbringe isoleringselementet også omkring et 25 krumt rør, således som det er antydet på fig. 2. Selvom limen efter længere tids oplagring af isoleringselementet er blevet fuldstændig hård og sprød, vil det være muligt at bøje elementet, idet limen danner ringe med indbyrdes afstand på langs af isoleringselementet. Det limfri og derfor 30 smidige arkmateriale i beklædningen mellem limstribeme eller rækkerne af limpunkter kan sammenfoldes i områderne mellem disse, således at elementet kan bøjes under sammentrykning af mineraluldsringene langs krumningens inderside. På fig. 2 er isoleringselementet vist med stiplede linier 35 inden bøjningen og med fuldt optrukne linier efter bøjningen.Due to the intermittent adhesive strips, it is possible to also place the insulating element around a 25 curved pipe, as indicated in FIG. 2. Although, after prolonged storage of the insulating element, the adhesive has become completely hard and brittle, it will be possible to bend the element as the adhesive forms longitudinal spaced rings of the insulating element. The glue-free and therefore flexible sheet material in the cladding between the glue strips or rows of glue points can be folded into the spaces between them so that the element can be bent during compression of the mineral wool rings along the inside of the curvature. In FIG. 2, the insulating element is shown in dotted lines 35 before the bend and with fully drawn lines after the bend.

.1 stedet for at påføre limen i en række parallelle, 5 forløbende striber kan limen påføres således, at den forlø ber i skrueform omkring isoleringselementet, uden at isole ringselementets bøjelighed derved påvirkes..1 instead of applying the adhesive in a series of parallel, 5-running strips, the adhesive may be applied in a helical manner around the insulating element without affecting the flexibility of the insulating element.

Claims

A pipe insulation element comprising a plurality of approximately identical, annular, mineral wool, glass wool or similar plate material cut into bodies having such a fiber structure that they have the greatest axial compressibility, which mineral wool bodies are assembled with a common axis and wound with a smooth, possibly. creped or folded sheet material glued to the mineral wool, characterized in that the glue is applied in the form of substantially parallel rows of glue points, the rows extending approximately perpendicular to the axis of the element and forming between them circumferential bands of glue-free sheet material.

Insulation element according to claim 1, characterized in that the glue points are elongated stripes.

An insulating element according to claim 1 or 2, characterized in that the glue points are arranged so close together that they essentially coincide with unbroken stripes.

Insulating element according to claim 1, 2 or 3, characterized in that the rows of glue points extend in screw form around the element.

Insulation element according to claim 2, 3 or 4, characterized in that the a-real covered by the stripes on the sheet material constitutes 10 - 70% of the area of the sheet material.

Insulating element according to claim 3, 4 or 5, characterized in that the distance between the center lines of the adhesive strips is approx. 22.5 mm, the adhesive strips being about 1.5 mm wide and approx. 1 mm high.