CA1269315A - Heat insulating device - Google Patents
Heat insulating deviceInfo
- Publication number
- CA1269315A CA1269315A CA000490052A CA490052A CA1269315A CA 1269315 A CA1269315 A CA 1269315A CA 000490052 A CA000490052 A CA 000490052A CA 490052 A CA490052 A CA 490052A CA 1269315 A CA1269315 A CA 1269315A
- Authority
- CA
- Canada
- Prior art keywords
- tongue
- groove
- cellular plastic
- insulating member
- plastic insulating
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
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- Thermal Insulation (AREA)
Abstract
ABSTRACT
The present invention relates to cellular plastic insulating tubes or cellular plastic insulating plates of a flexible plastic foam with a groove- and tongue-like closing system arranged along the longitudinal axis, in which the groove and tongue can be undercut. The tongue consists of a more rigid or stiffer material than the material forming the groove, or, if the tongue consists of the same material as the insulating cellular material, this is reinforced or stiffened.
The present invention relates to cellular plastic insulating tubes or cellular plastic insulating plates of a flexible plastic foam with a groove- and tongue-like closing system arranged along the longitudinal axis, in which the groove and tongue can be undercut. The tongue consists of a more rigid or stiffer material than the material forming the groove, or, if the tongue consists of the same material as the insulating cellular material, this is reinforced or stiffened.
Description
- ~2E;~3~
Heat insulating device The present invention relates to a heat insul-ating device such as a cellular plastic insulating tube or a cellular plastic insulating plate, with a tongue and groove-like closure ~ystemO
Heating and cooling system~ are currently insulated against the lo~s of heat or cold by the mo~t varied typas of insulating tu~es or insula~ing plate-q which are designed to be drawn over the tubes or duct~. The most widely known and currently used insulating tubes or insulating plates consist of agglomerate rock wool or gla~s fibre~, or of a wide variety of pla~tics, e.g. based on ru~ber, synthetic rubber or other plastics, or of mineral foamsO Tube insulations are manufactured either as half shells or as all-round shells. Prefabricated plates o~ the same material~ are aYailable for in~ulating air duct~.
The tube~ are in ulated by drawing the ~plit tube~
over the tube to be in~ulated or by ap~lyi~g the ~6~3~
insulating plates laterally to the duct~ to be insulated. Once the in~ulating tubes have been drawn over or the insulating plates applied, the open slit~s) must be closed, so as to ensure that the insulating member does not come away Erom the tube or duct to be insulated~ A further rea~on for tightly cloaing the ~lit is to guarantee perfect in~ulation and to prevent any moi~ture reaching the system to (~. be insulated through the slit in the in~ulati~g tube.
Today the method which is u3ually employed to close thesa slit~ lies in either windi~g ~uitable matarials around the insulating layer or ~ticking a self-adhesive strip of a suitable material over the slit. This applie~ both to the slit extending in the longitudinal direction and to the joint point~
between the individual insulating tube sections.
These ~lits are frequently al~o clo~ed by applying a ~uitable adhesive to the surface~ of the joint points when the tubes are laid and then manually pre~sing them together, until the adhe~ive holds.
There are also insulating.tubes or plate~ which are provided in the factory with a ~elf-adhe~ive ~krip, half of which i applied to the tube and the other half of which i~ provided with a prot~ctiv~ foil~
The per~on laying the ~ube~ xe~oves the protsc~ive layer on the one hal~ o~ thæ adhesiv~ strip, draw~
ths in3ulating tube over the ~u~æ ~o be inYulated 31~
-3~
and then presses the projecting foil, now free of the protective layer, on to the opposite in~ulatiny tuke section so as ~o tightly clo~e the slit. There are also insulating tube~ which are provided with a walded-on, so~called pla~tic zipper.
However, the~e closing sy~tems which are usually used today have considerable disadvan~ages, the following in particular:
(a) There i~ no guarantee that the per~on laying ~he tubes will always work ~n a careul manner.
There are therefore fre~uent ca~es o~ incomplete ~urface adhesion of the joint points at the slit, ; thu~ leaving open areas. This kind of adhesion at the joint point~ of the slits by applying adheslve materials also gives rise to a hardaning proce~s, cau~ing the formation of a cold or heat bridge, which ~t thi~ point i~ a be~ter conductor than the ~~, actual insulating material and thus c~nducts heat or cold to the out~ide.
20 ~b) When adhesive foils are u~ed to clo~e the tube it frequently happen3 that the joint point~ o~ the tube slit~ are not firstly pressed completely together, thu~ causing ~o-called air brid0~3. ~his, in turn, result~ in cold or heat ~ridge~O
25 t c ) Laying the t:ube9 using the~e clc:~sing sy~tems i8 e~pen~ive, a~ ~he pxocedure i s relatively slow.
`
~- . -~LZ~3~i ~d) It often happens that insulat.ing tubes or plates become covered with dust at the building site.
Should the du~t not he completely removed before the slit is closed, the self-adhesive foil will not adhere co~pletely and open ayain after it has been laid~
[e) It is al~o known that insulating tubes are clamped together by plastic or metal clamps. ~hi3 ( type of closure entails the danger of even larger air bridges fonming. Sati3fa&to~y insulation aannot therefore be guaranteed.
In order to avoid these di~advantages it was proposed some years ago, in the DE-PS 25 03 42S, to form the tube slit according to ~he groove and tongue principle, in which the groove and tongue could he provided with undercuts, e.g. of the dovetail type, which would then act as a snap closurè. However, (~ cellular plastic insulating tube~3 with this kind of groove and tongu~ arrangement have not as yet been 20 put into practice, probably because these groove and tongue ~ystems cannot functioxl a~ I'Anap closure "
where cellular materials are involvad. Thi~ i~
~ecause in the ca~e of hard cellulax materials the undercuts are broken off upon joining w~ile in the ca~e o~ ~le~ible cellular mat~rials the tongue pro-~ided wi~h undercut3 is not sufficiently ri~id to be insarte~ in the groove provided with undercu~s~
' ':
An object of the present invention is therefore to provide a heat insulating device such as a cellular plastic insulating tube or plate, with a groove and tongue closure system whi~h can actually be put into practice and in which the groove and tong~e system functions as an actual snap closure.
According to the invention the tongue is more rigid or stiffer than the material forming the receptacle therefor.
Thus according to the invention there is provided a cellular plastic insulat.ing member of a flexible plastic foam lQ material for thermally insulating a conduit, such as a pipe, duct or the like, the member having a closing line extending longitudinally along the conduit, along which line facing longitudinal surfaces of the insulating member are joined together, a closing system located along the closing line and comprising a groove and a tongue, the groove comprising a longitudinally extending groove formed into the material of the member along at least one side of the line~ the opening of the groove, viewed in a transverse cross section, being smaller than the dimension across certain interior portions of the groove, also viewed in transverse cross section, the tongu~ of the closing system operatively connected to the side of the closing line other than the side having the groove, the tongue having a portion, viewed in transverse cross section, which is LCM:sks :, ' ..
-5a æ ~ 3 ~ 5 larger than the opening of the groove, and the tongue being undercut, of smaller dimension closer to the side of the insulating member to which it is operatively connected, such that the tongue and groove snap fit into engagement with each other, and the tongue being stiffer than the material forming the groove.
More particularly, the present invention therefore provides cellular plastic insulating tubes or cellular plastic insulating plates of a flexible plastic foam with a tongue and groove closure system arranged along a longitudinal axis, in which the groove and tongue are provided with undercuts, wherein the tongue consists of a more rigid or stiffer material than the material forming the groove, or, if the tongue consists of the same material as the insulating cellular material, the tongue is reinforced or stiffened.
LCM:sks ~6~93~;
The tongue and groove may be formed from ~he foamed material in which case the ton~ue may be pro-vided with a reinforcing coating or an inner re inforcement7 Alternatively ~he tongue may be made of a material which is more rigid or sti~fer than the ~oamed material.
In the latter case a plastic foam profile, for axa~ple, the density of which is, for example 25 to ( 100% greater than that of the cellular pla~tic in~ulating tube or the cellular plastic insulating plate, i~ welded or glued to the ~urface opposite the groove. An embodiment of thi~ kind i5 preerred according to the invention. However, in~tead of the plastic foam profile, it is also possible to weld or glue on a closed plaqtic hose or a pla~tic hose open in ~he longitudinal direction, i~ thi~ is sufficiently rigid. The ~ame applie~, ~or example, to a closed or ( longitudinally open plaqtic, metal or glas~ ~ibre`
tube which, after welding or glueing on, produces the requi red tongueO For example, a closed or open aluminium or copper tube could be used as khe tongue, if the insulating tube or the in~ulating plate i~ to have a certain degree of rigidity~ Furthenmore, t~e open ox ~1O3ed tubes, applied as a tongue, eould, if appropria~a, be used ~o accommoda~e lead~, e ~ g~
i~trument leads or record lines.
, , - ' ~2~1!3~;
The plastic foam profile described above and used as a tongue, as well as the pla~tic ho~e~ and the various clo~ed or open tube~, can al~o be pro vided with a continuous or broken or triansular notched lug which, for example, ha~ been inserted in a slit previously made in the plastic foam in the surface oppo~ite the groove and then glued. In the case of plastic foam pro~iles khe lug can Qxtend into the proile, the rigidity of which i5 then further increased by the lug, ~us facili~ating the insertion of the pro~ile in the groove.
It is al~o possible to use an appropriate double profile (solid or hollow, clo~ed or open), possibly connected by way of a com~on lug, in cases where, according to the invention, the in~ulating tube or the insulating plate compri~es an additional ~ groove instead of the tongue, so that the double - (` profile engage~ on both sides in the opposite grooves in th~ slit ~urface~.
Should it be de~i~able, in particular ~a~es, for the groove and the tongue to be glued toyether, the adhe~ive can be applied to one of the groove ~urfaces and/or the tongue surface~, po 3ibly a~ a self-adhesive 3trip with a removable protactive oil which, for example, can con~i3t of paperO The adhe~ive can of coursa al~o be a fu~ion adhe~ive, for 2xampl2 in the for~ of an applied foil or non~
' 3~LS
woven 3trip which, when the insulating tube~ or plate~ are laid, i activated by a hot air device and pre~ed together. ~Iowever, magnetic lacquer can be u~ed in~tead of fusion adhesive. It is of course pos~ible to glue the tongue and/or the groove in the usual manner by means of any other conventional adhesives.
Should the groove and the tongue con~i~t of the ( ~ame material and the ~ongue be provided with a reinforcir~g coating, it i9 po~sible, during the con-tinuous production of the insulating tubes or plates, to firstly make a groove-tongue-~lit along the longit-udinal axis of the insulating tube or plate in one working ~tep, particularly if the tubes or plate~
consi~t of ~henmoplastic foam. This 9iit can be of any desired shape, angular, round, oval, etc. and i~
formed by means of a simple heating wire or bar, Xn ( the case o~ an insulating tube, it is then opened up, the tongue i~ provided with the coating, which is left to harden, and the tongue is finally in~erted in the groove. When producing the groove and khe tongue care should be taken to en~ure that the temp-erature of the heating wixe or bar corre~pond~ pre-cisely to the melting point of the extru~ion material.
A suitable thenmo~tat can be u~ed for this purpo~eO
The temperature control mu~t be rsgulated in xelation to the melting point o~ the material and the speed of , 3~5;
g passage~ In~tead of usillg hQating wire or bars, the ~roove and tongue can al~o be produce~ by ultra~onic systems or laser beama. Care should ~e taken, when producing the groove and tongue, in conjunction with the longitudinal slit, to ensure that, e.g. not ~oo much material is melted away by overheating the heat-ing wires or bars.
According to a further pre~erred embodiment of the invention, it i5 al~o possible to rein~orce the tongue produced as described above by bisecting the tongue in the longitudinal direction as it is pro-duced and letting the bisector slit project beyond the tongua into the tube shell carrying the tongue.
A reinforcement strip of appropriate size and provided with adhesive on both sides or heated to welding temp-erature i~ then inserted in the bisector slit thu~
produced and ~irmly connected by pres~ing to the tube ( shell and the two tongue part~O The reinforcement strip can ~e smooth or, in order to increase rigidity, corruga~ed at right angle~ to the lo~itudinal axi~, ~o that it can easily adapt to any bend~ in the tube.
In the ~ame way a~ the lug de~cri~ed abova, the reinforcement strip can be provided with rece~es or, or example, be fonmed as ~ corrugated punched tapeJ
However, in many ca~es it may be particularly advantage-ou3 to ~irmly insert a relatively rigid pla~tic ~rand ben~ in a contlnuou~ly zig-zag manner or an appropriately ~2 Ei~3~;
bent metal wire in the bisector ~lit instead of khe reinforcement strip. rrhis ensures on the one hand tha~ the tongue, particularly in the case of ~on~les undercut at the base, is of the required rigidity, 5 so that it can be in~erted in the groove, and on the other hand that the insulating tube can ~till be slightly bent.
However, instead of inserting a finished reinforcement strip or wire etc., it i~ also po3~ible to produce ln situ in the bisector slit projecting into the tube shell a reinforcement or stif~ening by using a hardening plastic, which at the same time reinforce~ the bisector slit following finm adhesion or hardening. Suitable plastics for this purpose are known to persons ~killed in the art.
The tube ends are preferably forme~ such $hat, particularly in the case of fairly thick tubes, they ( comprise an annular groove at one end and a corre~-ponding annular tongue at the other, which annular tongue can be formed according to the ton~ue of the invention arranged along the longitudinal axis, both a3 regards shape and reinforcement or stiffening.
However, in~tead of the annular groove and annular tongue, one tube end can be externall~ milled off, e.g. up to half the thickness of the in~ulating wall tube, and the other end can be coxrespondingly internally milled o~f, 50 as to ob~ain an avsrlap .
. ' ', ' '' :
~6~3~$
pl~g-type connection, which can of cour~e al~o be glued together in the same way as the longitudinal groove-ton~le system and the annular groove-tongue system .
S In order that the invention may be more fully understood various embodiment~ thereof will now be described by way of illustrative example with refer-ence to the ~ccompanying drawing~ wherein, ( Figure~ 1 to 9 are transver~e sectional view~ of insulating tubes according to the invention;
Figures 10 to 17 are sectional ~iews of plates according to the invention, ~igure 18 is a longitudinal section of t~o tube3 according to the invention with a longitudinal stepped coupling and Figures 19 to 21 are secti onal views of further tube~
accordiny to the invention.
(~~ In tha Figures the reference numbers indicate the following:
1 ~lexible cellular plastic insulating tube
Heat insulating device The present invention relates to a heat insul-ating device such as a cellular plastic insulating tube or a cellular plastic insulating plate, with a tongue and groove-like closure ~ystemO
Heating and cooling system~ are currently insulated against the lo~s of heat or cold by the mo~t varied typas of insulating tu~es or insula~ing plate-q which are designed to be drawn over the tubes or duct~. The most widely known and currently used insulating tubes or insulating plates consist of agglomerate rock wool or gla~s fibre~, or of a wide variety of pla~tics, e.g. based on ru~ber, synthetic rubber or other plastics, or of mineral foamsO Tube insulations are manufactured either as half shells or as all-round shells. Prefabricated plates o~ the same material~ are aYailable for in~ulating air duct~.
The tube~ are in ulated by drawing the ~plit tube~
over the tube to be in~ulated or by ap~lyi~g the ~6~3~
insulating plates laterally to the duct~ to be insulated. Once the in~ulating tubes have been drawn over or the insulating plates applied, the open slit~s) must be closed, so as to ensure that the insulating member does not come away Erom the tube or duct to be insulated~ A further rea~on for tightly cloaing the ~lit is to guarantee perfect in~ulation and to prevent any moi~ture reaching the system to (~. be insulated through the slit in the in~ulati~g tube.
Today the method which is u3ually employed to close thesa slit~ lies in either windi~g ~uitable matarials around the insulating layer or ~ticking a self-adhesive strip of a suitable material over the slit. This applie~ both to the slit extending in the longitudinal direction and to the joint point~
between the individual insulating tube sections.
These ~lits are frequently al~o clo~ed by applying a ~uitable adhesive to the surface~ of the joint points when the tubes are laid and then manually pre~sing them together, until the adhe~ive holds.
There are also insulating.tubes or plate~ which are provided in the factory with a ~elf-adhe~ive ~krip, half of which i applied to the tube and the other half of which i~ provided with a prot~ctiv~ foil~
The per~on laying the ~ube~ xe~oves the protsc~ive layer on the one hal~ o~ thæ adhesiv~ strip, draw~
ths in3ulating tube over the ~u~æ ~o be inYulated 31~
-3~
and then presses the projecting foil, now free of the protective layer, on to the opposite in~ulatiny tuke section so as ~o tightly clo~e the slit. There are also insulating tube~ which are provided with a walded-on, so~called pla~tic zipper.
However, the~e closing sy~tems which are usually used today have considerable disadvan~ages, the following in particular:
(a) There i~ no guarantee that the per~on laying ~he tubes will always work ~n a careul manner.
There are therefore fre~uent ca~es o~ incomplete ~urface adhesion of the joint points at the slit, ; thu~ leaving open areas. This kind of adhesion at the joint point~ of the slits by applying adheslve materials also gives rise to a hardaning proce~s, cau~ing the formation of a cold or heat bridge, which ~t thi~ point i~ a be~ter conductor than the ~~, actual insulating material and thus c~nducts heat or cold to the out~ide.
20 ~b) When adhesive foils are u~ed to clo~e the tube it frequently happen3 that the joint point~ o~ the tube slit~ are not firstly pressed completely together, thu~ causing ~o-called air brid0~3. ~his, in turn, result~ in cold or heat ~ridge~O
25 t c ) Laying the t:ube9 using the~e clc:~sing sy~tems i8 e~pen~ive, a~ ~he pxocedure i s relatively slow.
`
~- . -~LZ~3~i ~d) It often happens that insulat.ing tubes or plates become covered with dust at the building site.
Should the du~t not he completely removed before the slit is closed, the self-adhesive foil will not adhere co~pletely and open ayain after it has been laid~
[e) It is al~o known that insulating tubes are clamped together by plastic or metal clamps. ~hi3 ( type of closure entails the danger of even larger air bridges fonming. Sati3fa&to~y insulation aannot therefore be guaranteed.
In order to avoid these di~advantages it was proposed some years ago, in the DE-PS 25 03 42S, to form the tube slit according to ~he groove and tongue principle, in which the groove and tongue could he provided with undercuts, e.g. of the dovetail type, which would then act as a snap closurè. However, (~ cellular plastic insulating tube~3 with this kind of groove and tongu~ arrangement have not as yet been 20 put into practice, probably because these groove and tongue ~ystems cannot functioxl a~ I'Anap closure "
where cellular materials are involvad. Thi~ i~
~ecause in the ca~e of hard cellulax materials the undercuts are broken off upon joining w~ile in the ca~e o~ ~le~ible cellular mat~rials the tongue pro-~ided wi~h undercut3 is not sufficiently ri~id to be insarte~ in the groove provided with undercu~s~
' ':
An object of the present invention is therefore to provide a heat insulating device such as a cellular plastic insulating tube or plate, with a groove and tongue closure system whi~h can actually be put into practice and in which the groove and tong~e system functions as an actual snap closure.
According to the invention the tongue is more rigid or stiffer than the material forming the receptacle therefor.
Thus according to the invention there is provided a cellular plastic insulat.ing member of a flexible plastic foam lQ material for thermally insulating a conduit, such as a pipe, duct or the like, the member having a closing line extending longitudinally along the conduit, along which line facing longitudinal surfaces of the insulating member are joined together, a closing system located along the closing line and comprising a groove and a tongue, the groove comprising a longitudinally extending groove formed into the material of the member along at least one side of the line~ the opening of the groove, viewed in a transverse cross section, being smaller than the dimension across certain interior portions of the groove, also viewed in transverse cross section, the tongu~ of the closing system operatively connected to the side of the closing line other than the side having the groove, the tongue having a portion, viewed in transverse cross section, which is LCM:sks :, ' ..
-5a æ ~ 3 ~ 5 larger than the opening of the groove, and the tongue being undercut, of smaller dimension closer to the side of the insulating member to which it is operatively connected, such that the tongue and groove snap fit into engagement with each other, and the tongue being stiffer than the material forming the groove.
More particularly, the present invention therefore provides cellular plastic insulating tubes or cellular plastic insulating plates of a flexible plastic foam with a tongue and groove closure system arranged along a longitudinal axis, in which the groove and tongue are provided with undercuts, wherein the tongue consists of a more rigid or stiffer material than the material forming the groove, or, if the tongue consists of the same material as the insulating cellular material, the tongue is reinforced or stiffened.
LCM:sks ~6~93~;
The tongue and groove may be formed from ~he foamed material in which case the ton~ue may be pro-vided with a reinforcing coating or an inner re inforcement7 Alternatively ~he tongue may be made of a material which is more rigid or sti~fer than the ~oamed material.
In the latter case a plastic foam profile, for axa~ple, the density of which is, for example 25 to ( 100% greater than that of the cellular pla~tic in~ulating tube or the cellular plastic insulating plate, i~ welded or glued to the ~urface opposite the groove. An embodiment of thi~ kind i5 preerred according to the invention. However, in~tead of the plastic foam profile, it is also possible to weld or glue on a closed plaqtic hose or a pla~tic hose open in ~he longitudinal direction, i~ thi~ is sufficiently rigid. The ~ame applie~, ~or example, to a closed or ( longitudinally open plaqtic, metal or glas~ ~ibre`
tube which, after welding or glueing on, produces the requi red tongueO For example, a closed or open aluminium or copper tube could be used as khe tongue, if the insulating tube or the in~ulating plate i~ to have a certain degree of rigidity~ Furthenmore, t~e open ox ~1O3ed tubes, applied as a tongue, eould, if appropria~a, be used ~o accommoda~e lead~, e ~ g~
i~trument leads or record lines.
, , - ' ~2~1!3~;
The plastic foam profile described above and used as a tongue, as well as the pla~tic ho~e~ and the various clo~ed or open tube~, can al~o be pro vided with a continuous or broken or triansular notched lug which, for example, ha~ been inserted in a slit previously made in the plastic foam in the surface oppo~ite the groove and then glued. In the case of plastic foam pro~iles khe lug can Qxtend into the proile, the rigidity of which i5 then further increased by the lug, ~us facili~ating the insertion of the pro~ile in the groove.
It is al~o possible to use an appropriate double profile (solid or hollow, clo~ed or open), possibly connected by way of a com~on lug, in cases where, according to the invention, the in~ulating tube or the insulating plate compri~es an additional ~ groove instead of the tongue, so that the double - (` profile engage~ on both sides in the opposite grooves in th~ slit ~urface~.
Should it be de~i~able, in particular ~a~es, for the groove and the tongue to be glued toyether, the adhe~ive can be applied to one of the groove ~urfaces and/or the tongue surface~, po 3ibly a~ a self-adhesive 3trip with a removable protactive oil which, for example, can con~i3t of paperO The adhe~ive can of coursa al~o be a fu~ion adhe~ive, for 2xampl2 in the for~ of an applied foil or non~
' 3~LS
woven 3trip which, when the insulating tube~ or plate~ are laid, i activated by a hot air device and pre~ed together. ~Iowever, magnetic lacquer can be u~ed in~tead of fusion adhesive. It is of course pos~ible to glue the tongue and/or the groove in the usual manner by means of any other conventional adhesives.
Should the groove and the tongue con~i~t of the ( ~ame material and the ~ongue be provided with a reinforcir~g coating, it i9 po~sible, during the con-tinuous production of the insulating tubes or plates, to firstly make a groove-tongue-~lit along the longit-udinal axis of the insulating tube or plate in one working ~tep, particularly if the tubes or plate~
consi~t of ~henmoplastic foam. This 9iit can be of any desired shape, angular, round, oval, etc. and i~
formed by means of a simple heating wire or bar, Xn ( the case o~ an insulating tube, it is then opened up, the tongue i~ provided with the coating, which is left to harden, and the tongue is finally in~erted in the groove. When producing the groove and khe tongue care should be taken to en~ure that the temp-erature of the heating wixe or bar corre~pond~ pre-cisely to the melting point of the extru~ion material.
A suitable thenmo~tat can be u~ed for this purpo~eO
The temperature control mu~t be rsgulated in xelation to the melting point o~ the material and the speed of , 3~5;
g passage~ In~tead of usillg hQating wire or bars, the ~roove and tongue can al~o be produce~ by ultra~onic systems or laser beama. Care should ~e taken, when producing the groove and tongue, in conjunction with the longitudinal slit, to ensure that, e.g. not ~oo much material is melted away by overheating the heat-ing wires or bars.
According to a further pre~erred embodiment of the invention, it i5 al~o possible to rein~orce the tongue produced as described above by bisecting the tongue in the longitudinal direction as it is pro-duced and letting the bisector slit project beyond the tongua into the tube shell carrying the tongue.
A reinforcement strip of appropriate size and provided with adhesive on both sides or heated to welding temp-erature i~ then inserted in the bisector slit thu~
produced and ~irmly connected by pres~ing to the tube ( shell and the two tongue part~O The reinforcement strip can ~e smooth or, in order to increase rigidity, corruga~ed at right angle~ to the lo~itudinal axi~, ~o that it can easily adapt to any bend~ in the tube.
In the ~ame way a~ the lug de~cri~ed abova, the reinforcement strip can be provided with rece~es or, or example, be fonmed as ~ corrugated punched tapeJ
However, in many ca~es it may be particularly advantage-ou3 to ~irmly insert a relatively rigid pla~tic ~rand ben~ in a contlnuou~ly zig-zag manner or an appropriately ~2 Ei~3~;
bent metal wire in the bisector ~lit instead of khe reinforcement strip. rrhis ensures on the one hand tha~ the tongue, particularly in the case of ~on~les undercut at the base, is of the required rigidity, 5 so that it can be in~erted in the groove, and on the other hand that the insulating tube can ~till be slightly bent.
However, instead of inserting a finished reinforcement strip or wire etc., it i~ also po3~ible to produce ln situ in the bisector slit projecting into the tube shell a reinforcement or stif~ening by using a hardening plastic, which at the same time reinforce~ the bisector slit following finm adhesion or hardening. Suitable plastics for this purpose are known to persons ~killed in the art.
The tube ends are preferably forme~ such $hat, particularly in the case of fairly thick tubes, they ( comprise an annular groove at one end and a corre~-ponding annular tongue at the other, which annular tongue can be formed according to the ton~ue of the invention arranged along the longitudinal axis, both a3 regards shape and reinforcement or stiffening.
However, in~tead of the annular groove and annular tongue, one tube end can be externall~ milled off, e.g. up to half the thickness of the in~ulating wall tube, and the other end can be coxrespondingly internally milled o~f, 50 as to ob~ain an avsrlap .
. ' ', ' '' :
~6~3~$
pl~g-type connection, which can of cour~e al~o be glued together in the same way as the longitudinal groove-ton~le system and the annular groove-tongue system .
S In order that the invention may be more fully understood various embodiment~ thereof will now be described by way of illustrative example with refer-ence to the ~ccompanying drawing~ wherein, ( Figure~ 1 to 9 are transver~e sectional view~ of insulating tubes according to the invention;
Figures 10 to 17 are sectional ~iews of plates according to the invention, ~igure 18 is a longitudinal section of t~o tube3 according to the invention with a longitudinal stepped coupling and Figures 19 to 21 are secti onal views of further tube~
accordiny to the invention.
(~~ In tha Figures the reference numbers indicate the following:
1 ~lexible cellular plastic insulating tube
2,2'.tongue
3,3' groove
4 reinforcement 3trip fusion adhesive 25 6 ~lexible cellular pla3t.ic insulating plate 7 l~g 8 double profile :~ 9 air shaft to be insula~ed . , -1~
Plgure 1 i5 a cross-sectional view o a flexible cellular plastic insulati~g tube 1, provided with a slit in the longitudinal direc~ion, with the welded-on or glued-on ~ore rigid or stiffer plastic foam tongue ~ according ~o the invention, which engages in the groove 3.
Figure 2 i 9 a cross- secti~nal view o a part : of a flexible cellular plastic insulating tube 1 wi th the welded-on or glued-on tongue 2, opan in the longitudinal direction.
Figure 3 is a cro3s-sectio~al view o~ a part of a flexible cellular plastic in~ulating tube 1, e.g.
a polyethylene tube, with hollow, welded-on or glued-on tongue 2 which i9 more rigid than the tube 1.
15Figures ~ - 6 are cross-~ectio~al view~ of a flexible cellular plastic insulating tube 1, wherein khe tongue 2 is provided with a reinforcement ~trip : ( 4 to make it more rigi~ than the material defining . the groove 3. The tongue 2 i~ shown recei~ed in the groov~ 3, It will be appreciated that in the foregoin~
Figuxes, the tongue 2 can be snap-fitted into the groova 3.
Figure3 7 - 9 are cross-sectional detail~ of flexible celiular pla~tic in~ulating tu~es 1 with the ~roove~ 3, which are partly prsvided with a ~usio~adhe~iv~ 5.
.
- .' ' ~ .
~693~S
Figures 10 - 13 are cxo-Qs-~ectional views of two longitudinal side~ of two flexible cellular pla~tic in~ulating plates 6, one of which iQ provided with ~he groove 3 and the other with the corresponding welded-on or glued-on tongue 2, which can consi~t of the materials mentioned in the above deseription.
Figure 14 is a crosq-sectional view of two lon~itudinal sides of two flexible cellular plastie (~ insulating plates 6, one of which is provided with the groove 3 and the other with the tongue 2. The tongue 2 bears a lug 7, which is glued into a slit in the flexible cellular plastic insulating plate 6 Figure 15 is a cross-sectional view o~ the cellular plastic insulating plates 6, which are provided with grooves 3 and in which is inserted the double profile 3, whic~h can be solid or hollow, cloqed or open, as the double tongue. These double profiles 8 ean al~o ke u~ed for flexible eellular plastic in~ulating tubes 1, in whieh ease however the centre point~ of the two profiles Qf the double profile 8 preferably lie on a circular line corres-ponding to the mean eircumference of the respeetive eellular pla~tic insulating tube 1.
Figure 16 is a eross-~ectional view of the longitudinal edges of two eellular pla~tic insulating plates 6 provided with a groove 3 and a tongue 2, which ha~ been cut ou~ o~ the cellular pla~tic - . .
.' . ~
3~
insulati~g plate 6 and is provided for reinforcement purpo~e~ with the reinforcement strip 4, which pro~
jects from the front end of the tongue 3 into the flexible cellular pla~tic in~ulating plate 6.
Figure 17 is a cross-sectional de~ail of an air shaft 9, which is surrounded by the flexible cellular plastic insulating plates 6, the groovs 3 and the tongue 2 fonming a diagonal connec~ion and the tongue ( 2 comprising a reinforcement strip 4, which projects into the flexible cellular pla~tic in~ulating plate 6.
Figure 18 is a longitudinal section of two ends, one inserted into the other and appropxiately milled off, of a flexible cellular plastic insulating tu~e 1.
The cellular plastic insulating tubes ~hown in Figures 1 to 3, for example, are -~moothly cut through at the top on the production line during the contin-uous manuacture of the tube~, then pressed open by several centimetre~ at the cut point by a "holding open" device. A spherical cutter then cuts a groo~e, accurate to the millimetre, in one side of the tube wall. A pla~tic or cellular plastic pro~ile is then continuou~ly applied a~ the tongue to the opposite ~ide of th~ slit b~ adhesion vr thenmal welding~ The plas~ic or cellular plas~ic profile is continuously rol~ed off a roll and appliad. Once the groove ha~
been made and the ~ongue profile applied, the tube i~ clo~ed again by ex~exnal pre~ure and con~inu~
~L2~3~
along the line. It is not absolutely essential or the groove and the tongue to be round. They can be of any desired shape, e.g. oval or angular. Poly-olefinea, e~g. polyethylene or polyurethane or other S quitable plastics can be u~e~.
According to a further preexred embodiment of the invention, the groove and the to~ue, arranged along the longitudinal axi~, can also be ~onmed as ( an ove~lap system, as shown in Figures 19 to 219 Other appropxiate overlap shapes are of cou~se pO~3-ible in this case. The overlap sy~tems shown in Figures 19 to 21 represent a quasi double groove-double tongue-system, in which the tongues in the various embodiments described above can be reinforced and provided with fusion adhesive or magnetic lacquer.
However, various overlap systems according to the invention can also comprise a tongue or tongues ~` without reinforcement, as may be the case, for example, in the embodiments according to Figure~ 19 and 20, if ~he cellular material is not too 1exible.
Figures 19 to 21 are cro~-sectional views of the arrangement of a double tongue-double groo~e-overlap ~ystem~
- "
.
Plgure 1 i5 a cross-sectional view o a flexible cellular plastic insulati~g tube 1, provided with a slit in the longitudinal direc~ion, with the welded-on or glued-on ~ore rigid or stiffer plastic foam tongue ~ according ~o the invention, which engages in the groove 3.
Figure 2 i 9 a cross- secti~nal view o a part : of a flexible cellular plastic insulating tube 1 wi th the welded-on or glued-on tongue 2, opan in the longitudinal direction.
Figure 3 is a cro3s-sectio~al view o~ a part of a flexible cellular plastic in~ulating tube 1, e.g.
a polyethylene tube, with hollow, welded-on or glued-on tongue 2 which i9 more rigid than the tube 1.
15Figures ~ - 6 are cross-~ectio~al view~ of a flexible cellular plastic insulating tube 1, wherein khe tongue 2 is provided with a reinforcement ~trip : ( 4 to make it more rigi~ than the material defining . the groove 3. The tongue 2 i~ shown recei~ed in the groov~ 3, It will be appreciated that in the foregoin~
Figuxes, the tongue 2 can be snap-fitted into the groova 3.
Figure3 7 - 9 are cross-sectional detail~ of flexible celiular pla~tic in~ulating tu~es 1 with the ~roove~ 3, which are partly prsvided with a ~usio~adhe~iv~ 5.
.
- .' ' ~ .
~693~S
Figures 10 - 13 are cxo-Qs-~ectional views of two longitudinal side~ of two flexible cellular pla~tic in~ulating plates 6, one of which iQ provided with ~he groove 3 and the other with the corresponding welded-on or glued-on tongue 2, which can consi~t of the materials mentioned in the above deseription.
Figure 14 is a crosq-sectional view of two lon~itudinal sides of two flexible cellular plastie (~ insulating plates 6, one of which is provided with the groove 3 and the other with the tongue 2. The tongue 2 bears a lug 7, which is glued into a slit in the flexible cellular plastic insulating plate 6 Figure 15 is a cross-sectional view o~ the cellular plastic insulating plates 6, which are provided with grooves 3 and in which is inserted the double profile 3, whic~h can be solid or hollow, cloqed or open, as the double tongue. These double profiles 8 ean al~o ke u~ed for flexible eellular plastic in~ulating tubes 1, in whieh ease however the centre point~ of the two profiles Qf the double profile 8 preferably lie on a circular line corres-ponding to the mean eircumference of the respeetive eellular pla~tic insulating tube 1.
Figure 16 is a eross-~ectional view of the longitudinal edges of two eellular pla~tic insulating plates 6 provided with a groove 3 and a tongue 2, which ha~ been cut ou~ o~ the cellular pla~tic - . .
.' . ~
3~
insulati~g plate 6 and is provided for reinforcement purpo~e~ with the reinforcement strip 4, which pro~
jects from the front end of the tongue 3 into the flexible cellular pla~tic in~ulating plate 6.
Figure 17 is a cross-sectional de~ail of an air shaft 9, which is surrounded by the flexible cellular plastic insulating plates 6, the groovs 3 and the tongue 2 fonming a diagonal connec~ion and the tongue ( 2 comprising a reinforcement strip 4, which projects into the flexible cellular pla~tic in~ulating plate 6.
Figure 18 is a longitudinal section of two ends, one inserted into the other and appropxiately milled off, of a flexible cellular plastic insulating tu~e 1.
The cellular plastic insulating tubes ~hown in Figures 1 to 3, for example, are -~moothly cut through at the top on the production line during the contin-uous manuacture of the tube~, then pressed open by several centimetre~ at the cut point by a "holding open" device. A spherical cutter then cuts a groo~e, accurate to the millimetre, in one side of the tube wall. A pla~tic or cellular plastic pro~ile is then continuou~ly applied a~ the tongue to the opposite ~ide of th~ slit b~ adhesion vr thenmal welding~ The plas~ic or cellular plas~ic profile is continuously rol~ed off a roll and appliad. Once the groove ha~
been made and the ~ongue profile applied, the tube i~ clo~ed again by ex~exnal pre~ure and con~inu~
~L2~3~
along the line. It is not absolutely essential or the groove and the tongue to be round. They can be of any desired shape, e.g. oval or angular. Poly-olefinea, e~g. polyethylene or polyurethane or other S quitable plastics can be u~e~.
According to a further preexred embodiment of the invention, the groove and the to~ue, arranged along the longitudinal axi~, can also be ~onmed as ( an ove~lap system, as shown in Figures 19 to 219 Other appropxiate overlap shapes are of cou~se pO~3-ible in this case. The overlap sy~tems shown in Figures 19 to 21 represent a quasi double groove-double tongue-system, in which the tongues in the various embodiments described above can be reinforced and provided with fusion adhesive or magnetic lacquer.
However, various overlap systems according to the invention can also comprise a tongue or tongues ~` without reinforcement, as may be the case, for example, in the embodiments according to Figure~ 19 and 20, if ~he cellular material is not too 1exible.
Figures 19 to 21 are cro~-sectional views of the arrangement of a double tongue-double groo~e-overlap ~ystem~
- "
.
Claims (15)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A cellular plastic insulating member of a flexible plastic foam material for thermally insulating a conduit, such as a pipe, duct or the like, said member having a closing line extending longitudinally along the conduit, along which line facing longitudinal surfaces of the insulating member are joined together, a closing system located along said closing line and comprising a groove and a tongue, said groove comprising a longitudinally extending groove formed into the material of the member along at least one side of said line, the opening of the groove, viewed in a transverse cross section, being smaller than the dimension across certain interior portions of the groove, also viewed in transverse cross section, said tongue of the closing system operatively connected to the side of the closing line other than the side having the groove, the tongue having a portion, viewed in transverse cross section, which is larger than said opening of the groove, and said tongue being undercut, of smaller dimension closer to the side of the insulating member to which it is operatively connected, such that the tongue and groove snap fit into engagement with each other, and said tongue being stiffer than the material forming the groove.
2. A cellular plastic insulating member according to Claim 1, wherein the tongue is formed of a material which is stiffer than the material which forms the groove.
3. A cellular plastic insulating member according to Claim 1, wherein the tongue is formed of the same material as the material forming the groove, and wherein the tongue has a reinforcing means to render the tongue stiffer than the material forming the groove.
4. A cellular plastic insulating member according to Claim 3, the tongue having the same density as the entire cellular plastic insulating member, and wherein the tongue is provided with a longitudinally extending reinforcement which projects circumferentially from the tongue across the closing line into the member on which the tongue is located.
5. A cellular plastic insulating member according to Claim 3, the tongue being of the same density as the material forming the groove, and said reinforcing means comprises a covering layer covering the tongue and of a stiffer material than the material of the tongue and the material forming the groove.
6. A cellular plastic insulating member according to Claim 2, said tongue being an element separate from the member an adhered to said member along its respective side of the closing line.
7. A cellular plastic insulating member according to Claim 1, said tongue and groove both having a rounded cross section.
8. A cellular plastic insulating member according to Claim 6, said tongue being a hollow plastic hose.
9. A cellular plastic insulating member according to Claim 6, said tongue being a hollow tube opening toward the groove.
10. A cellular plastic insulating member according to Claim 1, wherein opposing axial ends of said member are milled off in a radial direction, said milling off at opposite ends of the member being complementary to each other such that a first end of one member will fit in a complementary manner into a second end of a longitudinally adjacent member.
11. A cellular plastic insulating member according to Claim 1, wherein one axial end of said member comprises an annular groove and the other axial end comprises an annular tongue, and wherein said annular tongue is stiffer than the material forming the annular groove.
12. A cellular plastic insulating member according to Claim 1, including adhesion means for adhering the tongue and groove together.
13. A cellular plastic insulating member according to Claim 12, said adhering means comprising a fusion adhesive in the form of a fusion foil, fusion non-woven material or magnetic lacquer.
14. A cellular plastic insulating member according to Claim 1, wherein the member is of annular cross section for insulating a pipe, the member being a single annular member, opened and closeable along said closing line.
15. A cellular plastic insulating member according to Claim 1, said member being generally flat in the vicinity of said closing system and comprising plates to be mounted on generally flat duct surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000490052A CA1269315A (en) | 1985-09-05 | 1985-09-05 | Heat insulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000490052A CA1269315A (en) | 1985-09-05 | 1985-09-05 | Heat insulating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1269315A true CA1269315A (en) | 1990-05-22 |
Family
ID=4131315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000490052A Expired CA1269315A (en) | 1985-09-05 | 1985-09-05 | Heat insulating device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1269315A (en) |
-
1985
- 1985-09-05 CA CA000490052A patent/CA1269315A/en not_active Expired
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| Date | Code | Title | Description |
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| MKLA | Lapsed |