WO1993022596A1 - Heat insulation tape - Google Patents

Heat insulation tape Download PDF

Info

Publication number
WO1993022596A1
WO1993022596A1 PCT/FI1993/000178 FI9300178W WO9322596A1 WO 1993022596 A1 WO1993022596 A1 WO 1993022596A1 FI 9300178 W FI9300178 W FI 9300178W WO 9322596 A1 WO9322596 A1 WO 9322596A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat insulation
insulation tape
tape
heat
tion
Prior art date
Application number
PCT/FI1993/000178
Other languages
French (fr)
Inventor
Asko Huusko
Original Assignee
Eriste-Kype Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eriste-Kype Oy filed Critical Eriste-Kype Oy
Publication of WO1993022596A1 publication Critical patent/WO1993022596A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/78—Heat insulating elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/7654—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings
    • E04B1/7658—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings comprising fiber insulation, e.g. as panels or loose filled fibres
    • E04B1/7662—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings comprising fiber insulation, e.g. as panels or loose filled fibres comprising fiber blankets or batts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
    • E04B2/70—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of wood
    • E04B2/701—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of wood with integrated supporting and obturation function
    • E04B2/702—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of wood with integrated supporting and obturation function with longitudinal horizontal elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/027—Bands, cords, strips or the like for helically winding around a cylindrical object

Definitions

  • the invention relates to the heat insulation tape defined in the introductory section of the inde- pendent patent claim.
  • Heat insulation tape is used for sealing seams and narrow gaps in buildings and other structures. Such seams or gaps occur for instance around window and door frames, in between the logs of a log house, in the wall seams of an ordinary house, etc.
  • a drawback of the prior art heat insulation tape is that with respect to moisture, it does not react in the same fashion as wood, which is generally used both as the frame material and the material for door an window frames in various buildings.
  • This type of heat insulation tape does not absorb moisture, nor does it emit moisture like wood materials. As a conse ⁇ quence, moisture may be condensated in the structures and cause rot damages.
  • the object of the invention is to introduce a new heat insulation tape whereby the said drawback can be overcome.
  • the heat insulation tape of the invention is characterized by the novel features enlisted in the patent claims.
  • the heat insula- tion tape is formed of a number of porous wood fiber based material layers.
  • the number of these layers is at least two.
  • the relatively thin, paperlike material made of wood fiber based pulp can directly be used as the material for the heat insulation tape.
  • the heat insulation tape is formed as a tubular struc ⁇ ture. Thus the heat insulation tape obtains two layers that remain superimposed after folding.
  • the heat insulation tape is realized as a tubular structure, which in cross-section resembles an overtur ⁇ ned letter U.
  • the heat insulation tape is formed of two tubular material layers, which are interconnected at the lengthwise seam, most advantageously in a detacha ⁇ ble fashion.
  • the heat insulation tape elements are realized as a tubular structure, which in cross-section resembles an overturned letter U.
  • the heat insulation tape is provided with an additional porous insulation layer, which is made of some wood fiber based material.
  • the additional insulation layer is arranged lon ⁇ gitudinally in the middle region of the heat insulation tape.
  • An advantage of the invention is that with respect to moisture, the material of the heat insulati ⁇ on tape reacts in the same fashion as wood material; its capacities for binding and emitting moisture are good.
  • the employed raw material is organic wood fiber, particu ⁇ larly pulp, such as thermomechanical pulp, and in some applications recirculation paper, wherefore the mate- rial costs remain low.
  • Another advantage of the invention is that it has a good heat insulating capacity. Yet another advantage of the invention is that it is easy to work and treat; it is not ripped nor crumpled easily, nor does it emit dust during or after installation. Yet another advantage of the invention is that it is durable and has a long life; it is neither evapo ⁇ rated nor decomposed in damp conditions, or at high temperatures.
  • Yet another advantage of the invention is that the product is ecological and non-toxic.
  • figure 1 illustrates a heat insulation tape of the invention in a packing roll
  • figure 2 illustrates another heat insulation tape of the invention
  • figure 3 illustrates a third heat insulation tape of the invention
  • figure 4 illustrates a fourth heat insulation tape of the invention
  • figure 5 illustrates a fifth heat insulation tape of the invention
  • figure 6 illustrates how the heat insulation tape is used in a seam in between log layers.
  • the heat insulation tape 1 is rolled in a packing roll 2.
  • the heat insulation tape 1 comprises a surface material layer 3, 4 and two intermediate layers 5.
  • the surface material layers 3, 4 and the intermediate layers 5 are separate layers, at least in the middle region of the tape. At the tape edges they may be attached.
  • the surface material layer 3, 4 is formed of two parts, the edges of the second part 4 being bent under the edges of the first part 3, and most advantageously these parts are glued together.
  • FIG 2. Another heat insulation tape 6 of the inven ⁇ tion is illustrated in figure 2.
  • This heat insulation tape 6 comprises four material layers 7. It is formed of one uniform material band, with longitudinal edges glued together. The flat material tube thus created is folded lengthwise in the middle, to form a heat insula ⁇ tion tape resembling an overturned letter U in cross— section.
  • a third heat insulation tape 8 of the inven ⁇ tion is illustrated in figure 3.
  • This heat insulation tape comprises two heat insulation tape elements 9, 10, each composed of four material layers 12, 13.
  • the tape is formed of two material bands with the longitudinal edges glued together.
  • the heat insulation tape elements 9, 10 are inter- connected by a seam 11, most advantageously in a de ⁇ tachable fashion (for instance as a tear-off seam) at the second longitudinal free edge of the flat material tube.
  • the created broad heat insulation tape 8 can thus be divided into two heat insulation tapes by tearing the heat insulation tapes 9, 10 off each other.
  • the heat insulation tape elements 9, 10 are equally wide, so that after tearing, of each side of the original heat insulation tape, there is obtained similar narrow heat insulation tape.
  • the layers 3, 4, 5; 7; 12, 13 of the heat insulation tape 1; 6; 8, 9, 10 are made of porous wood fiber or paper.
  • the raw material of this tape is a paper semi-product, made of wood or the like, i.e.
  • the raw material can be either partly or wholly paper pulp made of waste paper or the like, i.e. recycled paper pulp, which is most advantageously bleached.
  • recycled paper pulp The manu ⁇ facturing of a porous wood fiber or paper board or web as such is known in the prior art.
  • the thickness of the heat insulation tape 1; 6; 8, 9, 10 is for instance 3 - 10 mm (layer thickness for instance 0.2 - 2.0 mm) and width 30 - 200 mm.
  • the amount of tape coiled in a packing roll 2 is for exam ⁇ ple 10 - 15 m.
  • a fourth heat insulation tape 14 of the in- vention is illustrated in figure 4.
  • the heat insulation tape 14 comprises one or several surface material layers 15, which are made of porous wood fiber or paper or the like, in similar fashion as in the previous embodiments.
  • the surface material layers 15 are formed as an elongate tubular space, wherein an additional insulation layer 16 is provided.
  • the thickness of the additional insulation layer 16 is for instance 10 - 30 mm.
  • a fifth heat insulation tape 17 of the inven ⁇ tion is illustrated in figure 5.
  • the heat insulation tape 17 includes a surface material layer formed of two parts 18, 19, as in the heat insulation tape 1 of figu ⁇ re 1, and of two intermediate layers 20.
  • the heat insulation tape 6 is provided with an additional insulation layer 21.
  • the additional insulation layer 21 is arranged in the longitudinal middle region of the heat insulation tape 17, as is apparent from figure 2. Now the layer 21 clearly thickens the middle region of the heat insulation tape 17, whereas the peripheral areas remain thinner in comparison with the middle region.
  • the thicknesses of the peripheral areas of the heat insulation tape 17 of figure 5 can be 5 - 20 mm, whereas the thickness of the middle region may be 10 - 30 mm. Other measures correspond to the above mentioned measures of the heat insulation tape 1, for example.
  • the additional insulation layer 16, 21 is formed of porous wood fiber or paper, in similar fashion as the other material layers of the heat insulation tapes.
  • the material of the additional insulation layer 16, 21 is loose and incoherent, because it is surrounded by at least one relatively compact layer of material.
  • the additional insulation layer 16, 21 is formed of porous wood fiber or paper, in similar fashion as the other material layers of the heat insulation tapes.
  • the material of the additional insulation layer 16, 21 is loose and incoherent, because it is surrounded by at least one relatively compact layer of material.
  • the additional insulation layer 16, 21 is formed of porous wood fiber or paper, in similar fashion as the other material layers of the heat insulation tapes.
  • the material of the additional insulation layer 16, 21 is loose and incoherent, because it is surrounded by at least one relatively compact layer of material.
  • Recirculation fiber is paper fiber known as such, made by tearing or shredding paper into a fiber- like form.
  • the heat insulation tape of the invention can be used for instance in log walls, for insulating seams in between the logs.
  • Figure 6 illustrates a partial cross-section of a log wall, where in the seam 23 in between two superimposed logs 22 there is at the buil ⁇ ding stage fitted the heat insulation tape 1 of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Acoustics & Sound (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)

Abstract

The invention relates to a heat insulation tape. According to the invention, the heat insulation tape (1) is formed of a number of porous, wood fiber based material layers (3, 4, 5).

Description

HEAT INSULATION TAPE
The invention relates to the heat insulation tape defined in the introductory section of the inde- pendent patent claim.
Heat insulation tape is used for sealing seams and narrow gaps in buildings and other structures. Such seams or gaps occur for instance around window and door frames, in between the logs of a log house, in the wall seams of an ordinary house, etc.
In the prior art there is known a heat insu¬ lation tape made of mineral fiber, such as fiber glass or mineral.
A drawback of the prior art heat insulation tape is that with respect to moisture, it does not react in the same fashion as wood, which is generally used both as the frame material and the material for door an window frames in various buildings. This type of heat insulation tape does not absorb moisture, nor does it emit moisture like wood materials. As a conse¬ quence, moisture may be condensated in the structures and cause rot damages.
The object of the invention is to introduce a new heat insulation tape whereby the said drawback can be overcome.
The heat insulation tape of the invention is characterized by the novel features enlisted in the patent claims.
According to the invention, the heat insula- tion tape is formed of a number of porous wood fiber based material layers. The number of these layers is at least two. In that case the relatively thin, paperlike material made of wood fiber based pulp can directly be used as the material for the heat insulation tape. In a preferred embodiment of the invention, the heat insulation tape is formed as a tubular struc¬ ture. Thus the heat insulation tape obtains two layers that remain superimposed after folding.
In another preferred embodiment of the inven¬ tion, inside the tubular structure there is fitted one or several porous wood fiber based material layers. In another preferred embodiment of the inven¬ tion, the heat insulation tape is realized as a tubular structure, which in cross-section resembles an overtur¬ ned letter U.
In yet another preferred embodiment of the invention, the heat insulation tape is formed of two tubular material layers, which are interconnected at the lengthwise seam, most advantageously in a detacha¬ ble fashion.
In another preferred embodiment of the inven- tion, the heat insulation tape elements are realized as a tubular structure, which in cross-section resembles an overturned letter U.
In another preferred embodiment of the inven¬ tion, the heat insulation tape is provided with an additional porous insulation layer, which is made of some wood fiber based material.
In another preferred embodiment of the inven¬ tion, the additional insulation layer is arranged lon¬ gitudinally in the middle region of the heat insulation tape.
An advantage of the invention is that with respect to moisture, the material of the heat insulati¬ on tape reacts in the same fashion as wood material; its capacities for binding and emitting moisture are good.
Another advantage of the invention is that the employed raw material is organic wood fiber, particu¬ larly pulp, such as thermomechanical pulp, and in some applications recirculation paper, wherefore the mate- rial costs remain low.
Another advantage of the invention is that it has a good heat insulating capacity. Yet another advantage of the invention is that it is easy to work and treat; it is not ripped nor crumpled easily, nor does it emit dust during or after installation. Yet another advantage of the invention is that it is durable and has a long life; it is neither evapo¬ rated nor decomposed in damp conditions, or at high temperatures.
Yet another advantage of the invention is that the product is ecological and non-toxic.
The invention is described in more detail below, with reference to the appended drawings where figure 1 illustrates a heat insulation tape of the invention in a packing roll; figure 2 illustrates another heat insulation tape of the invention; figure 3 illustrates a third heat insulation tape of the invention; figure 4 illustrates a fourth heat insulation tape of the invention; figure 5 illustrates a fifth heat insulation tape of the invention; and figure 6 illustrates how the heat insulation tape is used in a seam in between log layers. In figure 1, the heat insulation tape 1 is rolled in a packing roll 2. In this embodiment, the heat insulation tape 1 comprises a surface material layer 3, 4 and two intermediate layers 5. In relation to each other, the surface material layers 3, 4 and the intermediate layers 5 are separate layers, at least in the middle region of the tape. At the tape edges they may be attached. The surface material layer 3, 4 is formed of two parts, the edges of the second part 4 being bent under the edges of the first part 3, and most advantageously these parts are glued together.
Thus the separate intermediate layers 5 are located in the elongate, tubular space defined by the surface material layers 3, 4.
Another heat insulation tape 6 of the inven¬ tion is illustrated in figure 2. This heat insulation tape 6 comprises four material layers 7. It is formed of one uniform material band, with longitudinal edges glued together. The flat material tube thus created is folded lengthwise in the middle, to form a heat insula¬ tion tape resembling an overturned letter U in cross— section. A third heat insulation tape 8 of the inven¬ tion is illustrated in figure 3. This heat insulation tape comprises two heat insulation tape elements 9, 10, each composed of four material layers 12, 13. The tape is formed of two material bands with the longitudinal edges glued together. There are thus created two flat material tubes, which both are folded lengthwise in the middle to form two heat insulation tape elements 9, 10, both resembling an overturned letter U in cross-secti¬ on. The heat insulation tape elements 9, 10 are inter- connected by a seam 11, most advantageously in a de¬ tachable fashion (for instance as a tear-off seam) at the second longitudinal free edge of the flat material tube. When necessary, the created broad heat insulation tape 8 can thus be divided into two heat insulation tapes by tearing the heat insulation tapes 9, 10 off each other. Advantageously the heat insulation tape elements 9, 10 are equally wide, so that after tearing, of each side of the original heat insulation tape, there is obtained similar narrow heat insulation tape. The layers 3, 4, 5; 7; 12, 13 of the heat insulation tape 1; 6; 8, 9, 10 are made of porous wood fiber or paper. The raw material of this tape is a paper semi-product, made of wood or the like, i.e. wood or paper pulp, added with a suitable binding agent. Alternatively, instead of new wood or paper pulp, the raw material can be either partly or wholly paper pulp made of waste paper or the like, i.e. recycled paper pulp, which is most advantageously bleached. The manu¬ facturing of a porous wood fiber or paper board or web as such is known in the prior art.
The thickness of the heat insulation tape 1; 6; 8, 9, 10 is for instance 3 - 10 mm (layer thickness for instance 0.2 - 2.0 mm) and width 30 - 200 mm. The amount of tape coiled in a packing roll 2 is for exam¬ ple 10 - 15 m.
A fourth heat insulation tape 14 of the in- vention is illustrated in figure 4. The heat insulation tape 14 comprises one or several surface material layers 15, which are made of porous wood fiber or paper or the like, in similar fashion as in the previous embodiments. The surface material layers 15 are formed as an elongate tubular space, wherein an additional insulation layer 16 is provided. The thickness of the additional insulation layer 16 is for instance 10 - 30 mm. Thus there can be produced thicker heat insulation tapes than those illustrated in figures 1 - 3. A fifth heat insulation tape 17 of the inven¬ tion is illustrated in figure 5. The heat insulation tape 17 includes a surface material layer formed of two parts 18, 19, as in the heat insulation tape 1 of figu¬ re 1, and of two intermediate layers 20. Moreover, the heat insulation tape 6 is provided with an additional insulation layer 21.
Most advantageously the additional insulation layer 21 is arranged in the longitudinal middle region of the heat insulation tape 17, as is apparent from figure 2. Now the layer 21 clearly thickens the middle region of the heat insulation tape 17, whereas the peripheral areas remain thinner in comparison with the middle region.
The thicknesses of the peripheral areas of the heat insulation tape 17 of figure 5 can be 5 - 20 mm, whereas the thickness of the middle region may be 10 - 30 mm. Other measures correspond to the above mentioned measures of the heat insulation tape 1, for example.
In the heat insulation tapes of figures 4 and 5, the additional insulation layer 16, 21 is formed of porous wood fiber or paper, in similar fashion as the other material layers of the heat insulation tapes. However, the material of the additional insulation layer 16, 21 is loose and incoherent, because it is surrounded by at least one relatively compact layer of material. Advantageously the additional insulation layer
16, 21 is partly or wholly made of recirculation pulp produced of waste paper or the like, i.e. recirculation paper pulp. Recirculation fiber is paper fiber known as such, made by tearing or shredding paper into a fiber- like form.
The heat insulation tape of the invention can be used for instance in log walls, for insulating seams in between the logs. Figure 6 illustrates a partial cross-section of a log wall, where in the seam 23 in between two superimposed logs 22 there is at the buil¬ ding stage fitted the heat insulation tape 1 of the invention.
In the above specification, the invention is explained with reference to a few preferred embodiments thereof. However, it is pointed out that the invention can be modified in many ways within the scope of the inventional idea defined in the appended patent claims.

Claims

PATENT CLAIMS
1. A heat insulation tape, c h a r a c t e ¬ r i z e d in that the heat insulation tape (1; 6; 8; 14; 17) is formed of a number of porous, wood fiber based material layers (3, 4, 5; 7; 12, 13; 15; 18, 19).
2. A heat insulation tape according to claim
1, c h a r a c t e r i z e d in that the heat insula¬ tion tape (1; 6; 8; 14; 17) is formed as a tubular structure.
3. A heat insulation tape according to claim
2, c h a r a c t e r i z e d in that inside the tubu¬ lar structure, there is fitted one or several porous, wood fiber based material layers (5; 20).
4. A heat insulation tape according to claim
2, c h a r a c t e r i z e d in that the heat insula¬ tion tape (6; 8) is realized as a structure which is tubular in cross-section and resembles an overturned letter U in shape.
5. A heat insulation tape according to claim
1, c h a r a c t e r i z e d in that the heat insula¬ tion tape (8) is formed of two tubular material struc¬ tures (9, 10) which are interconnected at a longitu¬ dinal seam (11), most advantageously in a detachable fashion.
6. A heat insulation tape according to claim 5, c h a r a c t e r i z e d in that the heat insula¬ tion tape elements (9, 10) are realized as structures which are tubular in cross-section and resemble an overturned letter U in shape.
7. A heat insulation tape according to any of the previous claims, c h a r a c t e r i z e d in that the heat insulation tape (14, 17) is provided with a porous additional insulation layer (16; 21) which is made of some wood fiber based material.
8. A heat insulation tape according to claim 7, c h a r a c t e r i z e d in that the additional insulation layer (21) is arranged in the longitudinal middle region of the heat insulation tape (17).
PCT/FI1993/000178 1992-04-23 1993-04-23 Heat insulation tape WO1993022596A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FIU920308 1992-04-23
FI920308U FI219U1 (en) 1992-04-23 1992-04-23 Vaermeisoleringsband

Publications (1)

Publication Number Publication Date
WO1993022596A1 true WO1993022596A1 (en) 1993-11-11

Family

ID=8534184

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1993/000178 WO1993022596A1 (en) 1992-04-23 1993-04-23 Heat insulation tape

Country Status (2)

Country Link
FI (1) FI219U1 (en)
WO (1) WO1993022596A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB809609A (en) * 1956-05-22 1959-02-25 Stillite Products Ltd Improvements in or relating to the lagging of underground pipes
DE3623713A1 (en) * 1986-07-14 1988-02-04 Christian Ellwein Insulating building material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB809609A (en) * 1956-05-22 1959-02-25 Stillite Products Ltd Improvements in or relating to the lagging of underground pipes
DE3623713A1 (en) * 1986-07-14 1988-02-04 Christian Ellwein Insulating building material

Also Published As

Publication number Publication date
FI219U1 (en) 1992-08-17
FIU920308U0 (en) 1992-04-23

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