DK201400032Y4 - Shrink sleeve with diffusion barrier - Google Patents
Shrink sleeve with diffusion barrier Download PDFInfo
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- DK201400032Y4 DK201400032Y4 DK201400032U DKBA201400032U DK201400032Y4 DK 201400032 Y4 DK201400032 Y4 DK 201400032Y4 DK 201400032 U DK201400032 U DK 201400032U DK BA201400032 U DKBA201400032 U DK BA201400032U DK 201400032 Y4 DK201400032 Y4 DK 201400032Y4
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- Prior art keywords
- shrink sleeve
- layer
- diffusion barrier
- sleeve according
- polymeric material
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- 230000004888 barrier function Effects 0.000 title claims abstract description 43
- 238000009792 diffusion process Methods 0.000 title claims abstract description 43
- 239000010410 layer Substances 0.000 claims description 87
- 239000004698 Polyethylene Substances 0.000 claims description 46
- 229920000573 polyethylene Polymers 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 22
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 19
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 19
- -1 polyethylene Polymers 0.000 claims description 17
- 229920000642 polymer Polymers 0.000 claims description 16
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 14
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000004743 Polypropylene Substances 0.000 claims description 11
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 11
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 11
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 7
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 5
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 claims description 4
- 229920001748 polybutylene Polymers 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 description 17
- 239000011810 insulating material Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000013521 mastic Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006300 shrink film Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000002937 thermal insulation foam Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
Opfindelsen vedrører en krympemuffe med et integreret diffusionsbarrierelag.The invention relates to a shrink sleeve with an integrated diffusion barrier layer.
Description
Krympemuffe med diffusionsspærreShrink sleeve with diffusion barrier
Opfindelsen vedrører en krympemuffe til anvendelse ved krympemuffesamlinger primært i forbindelse med samlinger af præisolerede rør.The invention relates to a shrink sleeve for use in shrink sleeve joints primarily in connection with joints of pre-insulated tubes.
BaggrundBackground
Præisolerede rør er opbygget med et eller flere indre rør, en ydre kappe samt et isoleringslag placeret imellem de(t) indre rør og kappen. Præisolerede rør fremstilles i ønskede længder, der muliggør transport, og er desuden fremstillet således, at længden af de(t) indre rør oftest overskrider længden af isolationslaget og kappen. Ved enderne af det isolerede rør, rager de(t) indre rør dermed normalt ud i forhold til det isoleringslaget og kappen.Pre-insulated pipes are constructed with one or more inner pipes, an outer sheath and an insulating layer located between the inner tube (s) and the sheath. Pre-insulated pipes are manufactured to desired lengths that allow for transport, and are additionally made such that the length of the inner tube (s) usually exceeds the length of the insulation layer and the sheath. Thus, at the ends of the insulated tube, the inner tube (s) usually protrudes relative to the insulating layer and sheath.
På opstillingsstedet samles de isolerede rør, ende mod ende, ved først at sammenkoble de indre rør fra hvert af de to isolerede rør. Denne sammenkobling kan typisk ske ved hjælp af svejsning. For at dække samlingsområdet med en beskyttende ydre kappe, kan en krympemuffe blive trukket eller skubbet ud over kappen på ét af de isolerede rør, der skal samles før sammensvejsningen af de to indre rør. Alternativt kan en plademuffe, der har form som en plade, der monteres rundt om samlingsområdet, benyttes.At the installation site, the insulated pipes are assembled end to end by first interconnecting the inner pipes from each of the two insulated pipes. This connection can typically be done by welding. To cover the assembly area with a protective outer sheath, a shrink sleeve may be pulled or pushed out over the sheath of one of the insulated tubes to be assembled prior to welding the two inner tubes. Alternatively, a plate sleeve having the form of a plate mounted around the assembly area may be used.
Efter sammensvejsning af de indvendige rør kan et lag af isoleringsmateriale påføres samlingen på en række forskellige måder. Det er det bl.a. kendt at lægge et svøb hen over det kappe- og isoleringsfri stykke, som er dannet mellem de sammensvejsede indre rør. Dette svøb monteres fast på kappeenderne, således at et afgrænset hulrum skabes. Herefter indføres et isoleringsmateriale i skumform ind i hulrummet, hvorved isoleringslaget mellem de sammensvejsede rør og svøbet dannes når skummet opskummes. Når skumisoleringen er dannet, vil svøbet i nogle tilfælde blive fjernet, og et materiale med diffusionsbarriereegenskaber (f.eks. alufolie) viklet omkring det kappefri område. I andre tilfælde lader man svøbet sidde omkring skumlaget, hvis svøbet i sig selv har diffusionsbarriereegenskaber eller alternativt vikles der en diffusionsspærre rundt om svøbet, før endelig montering af krympemuffen.After welding the inner tubes, a layer of insulating material can be applied to the joint in a variety of ways. That's it known to wrap a casing over the casing and insulation-free piece formed between the welded inner tubes. This sheath is fixed to the sheath ends so as to create a defined cavity. Thereafter, a foam insulating material is introduced into the cavity, whereby the insulating layer between the welded tubes and the shroud is formed as the foam is foamed. Once the foam insulation is formed, the shroud will in some cases be removed and a material with diffusion barrier properties (e.g., aluminum foil) wrapped around the jacket-free area. In other cases, the scoop is left around the foam layer if the scoop itself has diffusion barrier properties or alternatively, a diffusion barrier is wound around the scoop before final mounting of the shrink sleeve.
Det er også kendt, at montere to halvskaller af isoleringsmateriale, f.eks. i form af allerede op-skummet isoleringsmateriale eller ikke-skumbaseret isoleringsmateriale, rundt om krympe-muffesamiingen og efterfølgende montere krympemuffen - muligvis i kombination med montering afen diffusionsspærre før krympemuffen.It is also known to mount two half shells of insulating material, e.g. in the form of already foamed insulation material or non-foam based insulation material, around the shrink sleeve assembly and subsequently mount the shrink sleeve - possibly in combination with the fitting of a diffusion barrier before the shrink sleeve.
Selve krympemuffen vil ofte blive monteret ved at skubbe den ind over skumlaget, således at enderne af krympemuffen dækker enderne af kappen på de to rør. Krympemuffen hæftes normalt fast til kappen ved hjælp af en mastik, som sikre af krympemuffen hæfter fast til kappen ved en efterfølgende varmebehandling af krympemuffen, hvor den krymper. Derved bliver samlingen mellem de to rør dækket af en krympemuffe, som virker som kappe i samlingsområdet.The shrink sleeve itself will often be mounted by pushing it in over the foam layer so that the ends of the shrink sleeve cover the ends of the casing of the two tubes. The shrink sleeve is usually adhered to the sheath by means of a mastic which secures the shrink sleeve to the sheath by a subsequent heat treatment of the shrink sleeve where it shrinks. Thereby, the joint between the two pipes is covered by a shrink sleeve which acts as a sheath in the joint area.
En ulempe ved de beskrevne metode er, at de er tidskrævende, idet metoderne indeholder mange enkle trin, som hver især tager tid. Yderlig så medfører de mange metodetrin en øget risiko for, at der laves fejl i løbet af samlingen af rørene og den tilhørende montering af krympemuffen.A disadvantage of the described methods is that they are time consuming, as the methods contain many simple steps, each of which takes time. Furthermore, the many method steps entail an increased risk of errors being made during the assembly of the pipes and the associated fitting of the shrink sleeve.
I en alternativ kendt metode, forsegles en krympemuffe først til kappen på de to rør, hvorefter en opskumning af isoleringsmateriale laves direkte i krympemuffen ved hjælp af åbninger, som findes i krympemuffens overflade. Med den metode er det dog ikke muligt at montere et materiale med diffusionsbarriereegenskaber under krympemuffen.In an alternate known method, a shrink sleeve is first sealed to the sheath of the two tubes, after which a foam of insulating material is made directly into the shrink sleeve by means of openings located in the shrink sleeve surface. However, with this method, it is not possible to mount a material with diffusion barrier properties under the shrink sleeve.
Kendte krympemuffer består bl.a. af rør af PE (polyethylen) eller PEX (Cross-linked polyethy-len), der er varmet op, ekspanderet (evt. delvist) og nedkølet i ekspanderet form. Når muffen i forbindelse med montage opvarmes, søger den tilbage mod sin oprindelige form, og krymper således ned på krympemuffesamlingen. PE og PEX har i en vis udstrækning diffusionsbarriereegenskaber, men over tid vil isoleringsgasserne i isoleringslaget diffundere ud af isoleringen, hvorved denne mister noget af sin isolerende egenskaber.Known shrink sleeves include of PE (polyethylene) or PEX (Cross-linked polyethylene) tubes that have been heated, expanded (possibly partially) and cooled in expanded form. When mounted in connection with mounting, it seals back to its original shape, thus shrinking down on the shrink sleeve assembly. PE and PEX have some diffusion barrier properties, but over time, the insulating gases in the insulating layer will diffuse out of the insulation, thereby losing some of its insulating properties.
For at beskytte kabler placeret i jorden mod gennemtrængning af vand og fugt er det kendt at bruge en krympefilm med et metalfilmbarrierelag som f.eks. vist i WO 0219494. Et metalbar-rierelag rundt om isoleringslaget i forbindelse med isolerede rør har dog den ulempe, at vand, som løber i de(t) indre rør, og som til en vis grad kan gennemtrænge de(t) indre rør og derved diffundere ud i isoleringsmaterialet, ingen mulighed har for at forlade røret igen. Vandet kan derved ende i isoleringslaget, hvor det kan kondensere og føre til vandmætning af cellerne i isoleringsskummet. Dette medføreren reduceret isoleringsevne afskummet.In order to protect cables located in the ground against water and moisture penetration, it is known to use a shrink film with a metal film barrier layer such as e.g. shown in WO 0219494. However, a metal bar layer around the insulating layer in connection with insulated pipes has the disadvantage that water which flows into the inner tube and to some extent can penetrate the inner tube and thereby diffusing into the insulating material, no possibility of leaving the pipe again. The water can thereby end up in the insulating layer, where it can condense and lead to water saturation of the cells in the insulating foam. This leads to reduced insulating capacity foamed.
Resumé af frembringelsenSummary of the production
Et aspekt af den foreliggende frembringelse angår en krympemuffe til anvendelse ved krym-pemuffesamlinger i præisolerede rør opbygget med et eller flere indre rør, en ydre kappe samt et isoleringslag placeret imellem de(t) indre rør og kappen, kendetegnet ved, at krym-pemuffen omfatter mindst et diffusionsbarrierelag indeholdende én eller flere af polymererne PVDC (polyvinylidene chloride) og EVOH (ethylene vinyl alcohol), som introducere en betydelig stærkere barriere mod diffusion af ilt og kuldioxid end et tilsvarende lag af det tidligere brugte PE.One aspect of the present invention relates to a shrink sleeve for use in shrink sleeve assemblies in pre-insulated tubes constructed with one or more inner tubes, an outer sheath and an insulating layer located between the inner tubes and the sheath, characterized in that the shrink sleeve comprises at least one diffusion barrier layer containing one or more of the polymers PVDC (polyvinylidene chloride) and EVOH (ethylene vinyl alcohol), which introduce a significantly stronger barrier to diffusion of oxygen and carbon dioxide than a corresponding layer of the previously used PE.
Derved opnås en krympemuffe, som har forbedrede diffusionsbarriereegenskaber, som er med til at forlænge levetiden af krympemuffesamlingen. Desuden er krympemuffen med den integrerede diffusionsbarriere nem og hurtigt at installere med minimale risici for fejlmontering. At krympemuffen har en integreret diffusionsbarriere betyder, at der kan opnås en optimeret beskyttelse af isoleringslaget, som findes under krympemuffen. Med ovennævnte krympemuffe øges levetid af krympemuffesamlingen dermed betydeligt.Thereby, a shrink sleeve is obtained which has improved diffusion barrier properties which help extend the life of the shrink sleeve assembly. In addition, the shrink sleeve with the integrated diffusion barrier is easy and quick to install with minimal risks of misalignment. The fact that the shrink sleeve has an integrated diffusion barrier means that an optimized protection of the insulation layer can be obtained, which is found under the shrink sleeve. Thus, with the above shrink sleeve, the life of the shrink sleeve assembly is significantly increased.
I en eller flere udførelsesformer, omfatter krympemuffen yderligere mindst et andet poly-mermaterialelag bestående af én eller flere af polymererne PE (polyethylen), PP (polypropylen), PB (polybutylen), og ABS (acrylonitrile butadien styrene).In one or more embodiments, the shrink sleeve further comprises at least one other polymeric material layer consisting of one or more of the polymers PE (polyethylene), PP (polypropylene), PB (polybutylene), and ABS (acrylonitrile butadiene styrene).
Oftest vil PE blive benyttet som det andet polymermaterialelag da det har gode mekaniske egenskaber til brug som kappe og derudover er et billigt og let tilgængeligt materiale.Most often PE will be used as the second polymeric material layer as it has good mechanical properties for use as a sheath and is in addition a cheap and easily accessible material.
I en eller flere udførelsesformer, er krympemuffen vand og/eller vanddamp gennemtrængelig.In one or more embodiments, the shrink sleeve is water and / or water vapor permeable.
I en eller flere udførelsesformer, har diffusionsbarrierelaget en tykkelse på 1 mikrometer eller derover, f.eks. mellem 1 -100 pm, eller 1-50 pm, eller 1-20 pm, eller 1-10 pm I en eller flere udførelsesformer, er diffusionsbarrierelaget påført indersiden af krympemuffen.In one or more embodiments, the diffusion barrier layer has a thickness of 1 micron or more, e.g. between 1 -100 pm, or 1-50 pm, or 1-20 pm, or 1-10 pm In one or more embodiments, the diffusion barrier layer is applied to the inside of the shrink sleeve.
I en eller flere udførelsesformer, er diffusionsbarrierelaget placeret mellem to lag af det andet polymermaterialelag, hvilket giveren øget beskyttelse af diffusionsbarrierelaget.In one or more embodiments, the diffusion barrier layer is positioned between two layers of the second polymeric material layer, which provides increased protection of the diffusion barrier layer.
I en eller flere udførelsesformer, indeholder krympemuffen et klæbemiddellag, bestående af f.eks. en termoplastik lim, en elastomer lim eller en termohærdende plast lim, hvor klæbe-middellaget er placeret imellem diffusionsbarrierelaget og det andet polymermaterialelag. Dette sikrer en forøget klæbning imellem de to polymerlag.In one or more embodiments, the shrink sleeve contains an adhesive layer consisting of e.g. a thermoplastic adhesive, an elastomeric adhesive or a thermosetting plastic adhesive wherein the adhesive layer is located between the diffusion barrier layer and the second polymeric material layer. This ensures increased adhesion between the two polymer layers.
I en eller flere udførelsesformer, indeholder krympemuffen tre lag, hvor det inderste lag er et diffusionsbarrierelag, det midterste lag er et klæbemiddellag og det yderste lag er et polymerlag bestående af én eller flere af polymererne PE (polyethylen), PP (polypropylen), PB (poly-butylen), og ABS (acrylonitrile butadien styrene). Oftest vil det ydre lag være et PE lag.In one or more embodiments, the shrink sleeve contains three layers, the inner layer being a diffusion barrier layer, the middle layer being an adhesive layer and the outer layer being a polymer layer consisting of one or more of the polymers PE (polyethylene), PP (polypropylene), PB (poly-butylene), and ABS (acrylonitrile butadiene styrene). Most often, the outer layer will be a PE layer.
I en eller flere udførelsesformer, indeholder krympemuffen fem lag, hvor det midterste lag er et diffusionsbarrierelag, de to tilstødende lag et klæbemiddellag og de to efterfølgende lag polymerlag bestående af én eller flere af polymererne PE (polyethylen), PP (polypropylen), PB (polybutylen), og ABS (acrylonitrile butadien styrene). Oftest vil de sidstnævnte lag være PE lag. Ved denne fem-lags udformning opnås en ekstra beskyttelse af diffusionsbarrierelaget i midten.In one or more embodiments, the shrink sleeve contains five layers, the middle layer being a diffusion barrier layer, the two adjacent layers an adhesive layer and the two subsequent layers of polymer layers consisting of one or more of the polymers PE (polyethylene), PP (polypropylene), PB ( polybutylene), and ABS (acrylonitrile butadiene styrene). Most often, the latter layers will be PE layers. This five-layer design provides additional protection for the diffusion barrier layer in the middle.
De forskellige lag, som krympemuffen er opbygget af, kan være co-ekstruderede.The various layers on which the shrink sleeve is constructed may be co-extruded.
I en eller flere udførelsesformer, er krympemuffen opbygget af forskellige lag udvalgt fra gruppen bestående af PE/PETP-PVDC/PE, PE/PVDC/PE, PETP-EVOH/PE, OPA/PA-EVOH-PA/PE og OPA-PVDC/PE.In one or more embodiments, the shrink sleeve is constructed of various layers selected from the group consisting of PE / PETP-PVDC / PE, PE / PVDC / PE, PETP-EVOH / PE, OPA / PA-EVOH-PA / PE and OPA-PVDC / PE.
I en eller flere udførelsesformer, har det andet polymermaterialelag formhukommelse.In one or more embodiments, the second polymeric material layer has mold memory.
I en eller flere udførelsesformer, danner det andet polymermaterialelag et semikrystallinsk netværk.In one or more embodiments, the second polymeric material layer forms a semicrystalline network.
I en eller flere udførelsesformer, er det andet polymermaterialelag krydsbundet.In one or more embodiments, the second polymeric material layer is cross-linked.
I en eller flere udførelsesformer, indeholder krympemuffen åbninger til indførelse af isoleringsmateriale og/eller udluftning af luft.In one or more embodiments, the shrink sleeve includes openings for introducing insulating material and / or venting air.
Kort beskrivelse af figurerneBrief description of the figures
Figur 1 viser to rør, som skal samles og hvor krympemuffen kan bruges i forbindelse med isoleringen af dette område.Figure 1 shows two pipes to be assembled and where the shrink sleeve can be used in connection with the insulation of this area.
Figur 2a og 2b viser to forskellige udførelsesformer af krympemuffen.Figures 2a and 2b show two different embodiments of the shrink sleeve.
Detaljeret beskrivelse af frembringelsenDetailed description of the production
Figur 1 viser to rør 100, som begge består af et eller flere indre rør 102, en kappe 106 og et isoleringslag 104 placeret mellem kappen 106 og de(t) indre rør 102. Når to rør 100 samles, sker det ofte ved først at sammensvejse de indre rør 102 på hvert af de to rør 100. Før de indre rør svejses sammen, kan en tubeformet krympemuffe, f.eks. som vist i figurerne 2a og 2b, skubbes ind over det ene af de to rørs ender. Denne type krympemuffe er meget ofte set benyttet i forbindelse med krympemuffesamlinger. Som et alternativ til den tubeformede krympemuffe, kan en plademuffe evt. med krympeegenskaber også benyttes.Figure 1 shows two pipes 100, both of which consist of one or more inner pipes 102, a casing 106 and an insulating layer 104 located between the casing 106 and the inner pipes 102. When two pipes 100 are assembled, weld the inner tubes 102 on each of the two tubes 100. Before the inner tubes are welded together, a tubular shrink sleeve, e.g. as shown in Figures 2a and 2b, is pushed in over the ends of one of the two tubes. This type of shrink sleeve is very often seen in connection with shrink sleeve joints. As an alternative to the tubular shrink sleeve, a plate sleeve may be used. with shrink properties also used.
Isoleringsmaterialelaget, som placeres ovenpå de(t) indre rør ved krympemuffesamlingerne kan dannes ved opskumning af et opskumningsmiddel, f.eks. i et svøb, som monteres på en måde, så det dækker hele den uisolerede krympemuffesamling. Et eksempel på et sådan opskumningsmiddel er cyclopentan til fremstilling af polymerskum fra fx polyurethan. I den færdige skum, vil skumcellerne indeholde en gas sammensætning med en betydelig mængde af kuldioxid og pentan, hvor kuldioxid genereres primært mens den kemiske reaktion forløber.The insulating material layer placed on top of the inner tube (s) of the shrink sleeve joints may be formed by foaming a foaming agent, e.g. in a casing which is mounted in a way to cover the entire uninsulated shrink sleeve assembly. An example of such a foaming agent is cyclopentane for the production of polymeric foam from, for example, polyurethane. In the finished foam, the foam cells will contain a gas composition with a significant amount of carbon dioxide and pentane, with carbon dioxide being generated primarily while the chemical reaction is proceeding.
Som et alternativ til opskumning af isoleringsmaterialet, kan man også montere to halvskaller af færdigopskummet isoleringsmateriale eller lignende, som stadig indeholder en given mængde gasser, der har isolerende egenskaber.As an alternative to foaming the insulating material, two semi-shells of finished foamed insulating material or the like, which still contain a given amount of gases having insulating properties, can also be mounted.
Kendte krympemuffer er oftest lavet af PE (polyethylen) eller andre materialer, som er relativt åben for diffusion af kuldioxid (C02). Kuldioxid og pentan vil med tiden diffundere ud gennem kappen og vil blive erstattet med bl.a. ilt (02) fra den omgivende luft. Kuldioxid og pentan er begge vigtige gasser for at opretholde en god isoleringsevne af skummet, hvorfor det er problematisk, hvis for store mængder af disse gasser diffunderer ud af skummet. Problemet med ilt ophobning i isoleringsskummet er, at ilt har dårlige isoleringsegenskaber og yderlig medvirker til nedbrydning af skummet. Det er dermed PE kappematerialets diffusionsegenskaber, der regulerer transporten af ilt og kuldioxid molekyler gennem kappen, hvilket betyder, at det underliggende isoleringslag, hvor gasser diffundere ind og ud af, over tid mister sin isoleringsevne.Known shrink sleeves are most often made of PE (polyethylene) or other materials which are relatively open to diffusion of carbon dioxide (CO 2). Carbon dioxide and pentane will diffuse through the jacket over time and will be replaced by eg. oxygen (02) from the ambient air. Carbon dioxide and pentane are both important gases to maintain good foam insulation, which is why it is problematic if excessive amounts of these gases diffuse out of the foam. The problem with oxygen accumulation in the insulation foam is that oxygen has poor insulation properties and further contributes to the degradation of the foam. It is thus the diffusion properties of the PE sheath material that regulate the transport of oxygen and carbon dioxide molecules through the sheath, which means that the underlying insulating layer, where gases diffuse in and out, loses its insulating capacity over time.
Tidligere metoder til at opnå bedre diffusionsbarriereegenskaber af samlingsområdet mellem de to rør, har benyttet sig af en teknik, hvor isoleringsmaterialet dækkes med et materiale med diffusionsbarriereegenskaber (f.eks. alufolie) ved omvikling af det kappefri område med isoleringsmateriale. Dette har delvist løst problemet, men alligevel har vand, som løber i det indre rør, og som til en hvis grad kan gennemtrænge det indre rør og derved diffundere ud i isoleringsmaterialet, ingen mulighed haft for at forlade røret, hvis f.eks. en alufolie har været benyttet. Vandet kan derved ende i skummet, hvor det kan kondensere og føre til vandmæt ning af cellerne i isoleringsskummet. Dette kan også medføre en reduceret isoleringsevne af skummet.Previous methods of obtaining better diffusion barrier properties of the joint region between the two tubes have utilized a technique in which the insulation material is covered with a material having diffusion barrier properties (e.g., aluminum foil) by wrapping the sheath-free region with insulation material. This has partially solved the problem, but nevertheless water running into the inner tube, which to some extent can penetrate the inner tube and thereby diffuse into the insulating material, has not had the opportunity to leave the tube, for example. an aluminum foil has been used. The water can thereby end in the foam, where it can condense and lead to water saturation of the cells in the insulating foam. This can also result in reduced insulating capacity of the foam.
Et aspekt af den foreliggende frembringelse angår en krympemuffe som vist i figurerne 2a-b til anvendelse ved krympe muffesam linger. Krympemuffen er vist i to udførelsesformer 200a, 200b i figurerne 2a-b, men andre udformninger kan naturligvis også forstilles.One aspect of the present invention relates to a shrink sleeve as shown in Figures 2a-b for use in shrink sleeve assemblies. The shrink sleeve is shown in two embodiments 200a, 200b in Figures 2a-b, but other designs can of course also be represented.
Før sammensvejsning af de indre rør 102, trækkes krympemuffen 200a, 200b ind over det ene af rørene 100 således, at krympemuffen efter sammensvejsning af de indre rør 102, kan skubbes ud over krympemuffesamiingen. Når krympemuffen føres ud over krympemuffesamlin-gen, overlapper enderne 202 af mufferne 200a, 200b med kappen 106 på hvert af de to rør 100. Fastgørelsen af krympemuffen 200a, 200b til kapperne 106 gøres oftest ved hjælp af en termisk proces, hvor området opvarmes samt evt. ved hjælp af mastik som øger krympemuf-fens klæbeevne ned på kappen.Prior to welding the inner tubes 102, the shrink sleeve 200a, 200b is retracted over one of the tubes 100 so that, after welding the inner tubes 102, the shrink sleeve can be pushed beyond the shrink sleeve assembly. As the shrink sleeve is passed beyond the shrink sleeve assembly, the ends 202 of the sleeves 200a, 200b overlap with the sheath 106 on each of the two tubes 100. The attachment of the shrink sleeve 200a, 200b to the sheaths 106 is most often done by a thermal process where the region is heated and Possibly. with the help of mastic which increases the adhesive capacity of the shrink sleeve on the sheath.
Krympemuffen kan indeholde åbninger, som muliggør tilførsel af isoleringsmateriale efter enderne 202 på mufferne er fastgjort til kappen 106 på rørene 100, såfremt en opskumning af isoleringsmateriale skal foregå med muffen havende en funktion som et svøb.The shrink sleeve may contain openings which permit the supply of insulating material after the ends 202 of the sleeves are secured to the sheath 106 of the tubes 100, if a foam of insulating material is to be provided with the sleeve having a function as a shroud.
Krympemuffen 200a, 200b omfatter mindst et diffusionsbarrierelag (ikke markeret i figurerne) indeholdende én eller flere af polymererne PVDC (polyvinylidene chloride) og EVOH (ethylene vinyl alcohol).The shrink sleeve 200a, 200b comprises at least one diffusion barrier layer (not marked in the figures) containing one or more of the polymers PVDC (polyvinylidene chloride) and EVOH (ethylene vinyl alcohol).
Oftest vil krympemuffen yderlig omfatter mindst et andet polymermaterialelag bestående af én eller flere af polymererne PE (polyethylen), PP (polypropylen), PB (polybutylen), og ABS (acrylonitrile butadien styrene).Most often, the shrink sleeve will further comprise at least one other polymeric material layer consisting of one or more of the polymers PE (polyethylene), PP (polypropylene), PB (polybutylene), and ABS (acrylonitrile butadiene styrene).
Polymermaterialerne, som krympemuffen er opbyget af, kan være vand og/eller vanddamp gennemtrængelig. Det muliggør, at vand ikke ophober sig i isoleringslaget, men har mulighed for at diffundere ud af området omkring krympemuffesa miingen.The polymeric materials on which the shrink sleeve is made up may be water and / or water vapor permeable. This allows water to not accumulate in the insulating layer, but has the ability to diffuse out of the area around the shrink sleeve mixture.
Diffusionsbarrierelaget indeholdende én eller flere af polymererne PVDC (polyvinylidene chloride) og EVOH (ethylene vinyl alcohol), fungerer som diffusionsspærre for ilt og kuldioxid. Effekten af PVDC og/eller EVOH er, at en betydelig stærkere barriere mod diffusion af ilt og kuldioxid i sammenligning med et tilsvarende lag af det tidligere brugte PE, er opnået.The diffusion barrier layer containing one or more polymers PVDC (polyvinylidene chloride) and EVOH (ethylene vinyl alcohol) acts as diffusion barrier for oxygen and carbon dioxide. The effect of PVDC and / or EVOH is that a significantly stronger barrier to diffusion of oxygen and carbon dioxide in comparison with a corresponding layer of the previously used PE is obtained.
Det er vigtigt, at diffusionsbarrierelaget, omfattende én eller flere af polymererne PVDC og EVOH, er fleksibelt nok til at følge med geometri ændringen under en krympning af krympe-muffen, og derved forblive hæftet til det/de andre polymermaterialer som krympemuffen indeholder, således diffusionsbarrierelaget krymper sammen med det/de andre polymerlag.It is important that the diffusion barrier layer, comprising one or more of the polymers PVDC and EVOH, be flexible enough to follow the geometry change during a shrinkage of the shrink sleeve, thereby remaining adhered to the other polymeric material (s) contained in the shrink sleeve, thus the diffusion barrier layer. shrinks together with the other polymer layer (s).
Det vil også være fordelagtigt, at de forskellige polymermaterialer kan co-ekstruderes, eller at det diffusionsbarrierelag kan ekstrusion coates (extrusion coating) eller spray coates på det andet polymermaterialelag.It will also be advantageous for the various polymeric materials to be co-extruded or for the diffusion barrier layer to be extrusion coated or spray coated on the second polymeric material layer.
Begge typer af polymerlag, som er nævnt her, kan have formhukommelse. Dette betyder, at polymerlagene har evnen til at "huske" en makroskopisk primær form. Polymermaterialer med formhukommelse er i stand til, under særlige betingelser, og fra den primære form, at blive elastisk deformeret (strakt eller komprimeret) og fastholdt (indledningsvis ofte ved hjælp af lav temperatur) i en sekundær form med høj spænding i materialet. Den sekundære form kan, ved eksempelvis termisk eller elektrisk påvirkning, afspænde til den oprindelige tilstand (den primære form).Both types of polymeric layers mentioned herein may have shape memory. This means that the polymer layers have the ability to "remember" a macroscopic primary shape. Molded polymeric materials are capable, under special conditions, and of the primary shape, to be resiliently deformed (stretched or compressed) and retained (initially often by low temperature) in a secondary high-tension form in the material. The secondary form can, for example by thermal or electrical influence, relax to its original state (the primary form).
Det andet polymermaterialelag bestående af én eller flere af polymererne PE, PP, PB, og ABS kan være krydsbundne, og kan evt. have et semi-krystallinsk netværk, eksempelvis bestående af kovalent krydsbundne polymerer. Ved denne type materiale udnyttes smelteovergangen af de krystallinske områder i den sekundære form til at komme tilbage til den primære form.The second polymeric material layer consisting of one or more of the polymers PE, PP, PB, and ABS may be cross-linked, and may be crosslinked. have a semi-crystalline network, for example consisting of covalently cross-linked polymers. In this type of material, the melt transition of the crystalline regions of the secondary form is utilized to return to the primary form.
Et eksempel på kovalent krydsbundne materialer er polyethylen (PE), som er et relativt billigt polymermateriale med gode mekaniske egenskaber, hvilket gør det til en oplagt kandidat som et godt kappemateriale.An example of covalently cross-linked materials is polyethylene (PE), which is a relatively inexpensive polymer material with good mechanical properties, making it an obvious candidate as a good coat material.
For at reducere materialeomkostningerne for krympemuffen, kan det være fordelagtigt, hvis diffusionsbarrierelaget er så tyndt som muligt. I praksis vil en tykkelse helt ned til 1 pm skabe en tilfredsstillende barriere for ilt og kuldioxid. Oftest vil tykkelsen ligge på 1 mikrometer eller derover, f.eks. mellem 1 -100 pm, eller 1-50 pm, eller 1-20 pm, eller 1-10 pm.In order to reduce the material cost of the shrink sleeve, it may be advantageous if the diffusion barrier layer is as thin as possible. In practice, a thickness as low as 1 pm will create a satisfactory barrier to oxygen and carbon dioxide. Most often, the thickness will be 1 micron or more, e.g. between 1 -100 pm, or 1-50 pm, or 1-20 pm, or 1-10 pm.
Diffusionsbarrierelaget kan være påført indersiden af krympemuffen, så det vender direkte ind mod isoleringsmaterialet. Alternativt, kan diffusionsbarrierelaget være placeret mellem to lag af det andet polymermateriale.The diffusion barrier layer may be applied to the inside of the shrink sleeve so that it faces directly against the insulating material. Alternatively, the diffusion barrier layer may be located between two layers of the second polymeric material.
Imellem diffusionsbarrierelaget og det andet / de andre polymermaterialelag, kan der være et klæbemiddellag, bestående af f.eks. en termoplastik lim, en elastomer lim eller en termohær-dende plast lim.Between the diffusion barrier layer and the other polymer material layer (s), there may be an adhesive layer consisting of e.g. a thermoplastic adhesive, an elastomeric adhesive or a thermosetting plastic adhesive.
Krympemuffen kan være opbygget af forskellige lag udvalgt fra gruppen bestående af PE/PETP-PVDC/PE, PE/PVDC/PE, PETP-EVOH/PE, OPA/PA-EVOH-PA/PE og OPA-PVDC/PE.The shrink sleeve may be composed of various layers selected from the group consisting of PE / PETP-PVDC / PE, PE / PVDC / PE, PETP-EVOH / PE, OPA / PA-EVOH-PA / PE and OPA-PVDC / PE.
Det skal bemærkes, at udførelsesformer og træk, der er beskrevet i forbindelse med et af aspekterne af den foreliggende frembringelse, også gælder for de andre aspekter af frembringelsen.It should be noted that embodiments and features described in connection with one aspect of the present invention also apply to the other aspects of the invention.
Claims (10)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3975039A (en) * | 1970-11-03 | 1976-08-17 | Raychem Corporation | Heat-recoverable members |
| GB1604985A (en) * | 1978-05-25 | 1981-12-16 | Raychem Sa Nv | Branchoff method |
| WO1990016092A1 (en) * | 1989-06-20 | 1990-12-27 | Raychem Corporation | Device for forming a solder connection |
| WO1993009372A1 (en) * | 1991-10-31 | 1993-05-13 | Goldstar Cable Co., Ltd. | Heat shrinkable sleeve for connecting a pipe and cable |
| WO2002019494A1 (en) * | 2000-08-30 | 2002-03-07 | Chunma Corporation | Armature for heat shrinkable sleeve and heat shrinkable sleeve comprising it |
| WO2007127233A2 (en) * | 2006-04-27 | 2007-11-08 | Cryovac, Inc. | Multilayer film comprising polylactic acid |
-
2014
- 2014-02-20 DK DK201400032U patent/DK201400032Y4/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3975039A (en) * | 1970-11-03 | 1976-08-17 | Raychem Corporation | Heat-recoverable members |
| GB1604985A (en) * | 1978-05-25 | 1981-12-16 | Raychem Sa Nv | Branchoff method |
| WO1990016092A1 (en) * | 1989-06-20 | 1990-12-27 | Raychem Corporation | Device for forming a solder connection |
| WO1993009372A1 (en) * | 1991-10-31 | 1993-05-13 | Goldstar Cable Co., Ltd. | Heat shrinkable sleeve for connecting a pipe and cable |
| WO2002019494A1 (en) * | 2000-08-30 | 2002-03-07 | Chunma Corporation | Armature for heat shrinkable sleeve and heat shrinkable sleeve comprising it |
| WO2007127233A2 (en) * | 2006-04-27 | 2007-11-08 | Cryovac, Inc. | Multilayer film comprising polylactic acid |
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