CN114517832A - Sealing material with cellulose fibres - Google Patents
Sealing material with cellulose fibres Download PDFInfo
- Publication number
- CN114517832A CN114517832A CN202110018350.0A CN202110018350A CN114517832A CN 114517832 A CN114517832 A CN 114517832A CN 202110018350 A CN202110018350 A CN 202110018350A CN 114517832 A CN114517832 A CN 114517832A
- Authority
- CN
- China
- Prior art keywords
- sealing material
- fibres
- cellulose
- sealing
- pipe
- 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.)
- Pending
Links
- 239000003566 sealing material Substances 0.000 title claims abstract description 110
- 229920003043 Cellulose fiber Polymers 0.000 title claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 20
- 239000002861 polymer material Substances 0.000 claims description 17
- 229920002678 cellulose Polymers 0.000 claims description 9
- 239000001913 cellulose Substances 0.000 claims description 9
- 230000008961 swelling Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 229920000433 Lyocell Polymers 0.000 claims description 2
- 229920000297 Rayon Polymers 0.000 claims description 2
- 244000144992 flock Species 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 239000002759 woven fabric Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims 3
- 239000002356 single layer Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- -1 polypropylene Polymers 0.000 description 4
- 230000004913 activation Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
-
- 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
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/1686—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by winding a tape
-
- 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
- F16L21/00—Joints with sleeve or socket
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention relates to a sealing material for externally sealing a pipe carrying a liquid, wherein the sealing material contains 90% by weight of cellulose fibres, based on the total weight of the sealing material, and the cellulose fibres are present in the sealing material as threads, ribbons, threads, wedges or layers of fabric. Another subject of the invention relates to a method for sealing a conduit for transporting a liquid with a sealing material.
Description
Technical Field
The invention relates to a sealing material for externally sealing a liquid-carrying pipe, wherein the sealing material contains 90% by weight of cellulose fibres, based on the total weight of the sealing material.
Background
Sealing materials with cellulose fibres are well known.
For example, document WO 2000078888 describes a sealant with a matrix material in which cellulose should be present. Cellulose is used here because of its absorbency and a single-component sealing material is to be provided for buildings and for ducts.
In EP 1044246 a water-swellable sealing composition is disclosed, wherein the sealing composition has an elastomeric component.
Disclosure of Invention
The invention provides a sealing material for externally sealing a conduit for transporting a liquid, wherein the sealing material comprises 90% by weight of cellulose fibres based on the total weight of the sealing material, the cellulose fibres being present in the sealing material as yarns, ribbons, threads, wedges (keels) or layers of fabric. The present invention thus provides a sealing material which is composed mainly of cellulose fibres and thus mainly of natural raw materials. Furthermore, the cellulose fibres are present in a form which is very easy to handle, so that the sealing material can be used easily and quickly. Particularly in the case of rapid sealing of pipes, simple handling can be achieved with great simplification in use.
Another subject of the invention relates to a method for externally sealing a pipe conveying a liquid by means of a sealing material.
The pipe for transporting the liquid should preferably be a water pipe, which transports fresh water or waste water. The sealing material can be used particularly well for sealing two pipe sections, i.e. for sealing the place where two separate pipes are connected to one long pipe. By external sealing is here meant that the sealing material is applied mainly around the pipe on the outside of the pipe (or outside of each pipe), for example by winding around the outer pipe section area to be sealed. But external sealing is also understood to mean that a small portion of the sealing material is located inside the or each pipe that is to be sealed if at least 70% of the sealing material is applied to the outside of the pipe.
Detailed Description
In one embodiment of the sealing material, the cellulose fibers are present in the yarn, ribbon, thread or fabric layer as continuous fibers, rod-shaped fibers and/or random fibers.
In one embodiment, the length of the cellulose fibers is reduced by at least 2%, at most 20%, more preferably by at least 4%, at most 10%, and particularly preferably by at least 5%, at most 7% when contacted with an aqueous liquid as compared to the original length of the cellulose fibers. As a result, a renewed tensioning of the sealing material can advantageously take place, as a result of which the sealing material bears particularly firmly against the pipe to be sealed. For example, after the pipe is sealed, water may be sprayed onto the sealing material to create a better seal by shrinkage of the cellulose fibers. Furthermore, if the pipe loses its tightness afterwards (e.g. during operation), the shrinkage of the cellulose fibres may lead to a stronger sealing afterwards. Thus, damage due to a pipe being unsealed can be advantageously reduced or even prevented in a short period of time until a repair of the pipe is carried out.
In one embodiment, the cellulose fibers are viscose, lyocell, modal, cuprammonium, cotton or mixtures of the above. By using the cellulose fibres, the sealing material can be produced in a particularly sustainable manner and can also be removed easily (for example by rotting).
Preferably, the yarns are filament yarns or staple yarns. The use of cellulosic filament or staple yarns has the advantage that the cellulosic fibres are easy to handle and can be wound on bobbins. The sealing material thus achieved, or only the cellulose fibres used for producing the sealing material, can be easily transported and simply unwound or wound again. In one embodiment, the yarn made of cellulose fibers is a sealing material.
In one embodiment, the cellulose fibers are present in the form of a fine ribbon, wherein the cellulose fibers are present in the fine ribbon in a unidirectional arrangement, either singly or multiply. The unidirectional arrangement of the cellulose fibres in the ribbon is understood to mean that the cellulose fibres are oriented in the ribbon in one direction, stretched side by side, against one another. The ribbon can have more than one layer of cellulose fibers transverse to the direction of extension of the fibers. The unidirectional fiber orientation in the ribbons has the advantage that the fibers are oriented in the direction of the force flow within the sealing material and can thus increase the tensile force of the sealing material. It is thus advantageously possible to form a sealing material which can be stretched particularly firmly around the pipe without breaking the sealing material. In one embodiment, the thin band of cellulose fibers constitutes the sealing material.
In one embodiment, the cellulose fibres are present in the sealing material as threads, the cellulose fibres being present in the threads at from 50 to 200 revolutions per meter, preferably at from 75 to 125 revolutions per meter and particularly preferably at 100 revolutions per meter. The solution used as a thread has the advantage that the cellulose fibres form a close composite structure with each other inside the thread, without the cellulose fibres having to be connected to each other by other media, such as a matrix or pulp. Thereby, not only the transportation and use of the sealing material can be simplified, but also the production of the sealing material can be simplified. In one embodiment, the sealing material is constituted by threads made of cellulose fibres.
In one embodiment, the cellulosic fibers are present as a fabric layer in the sealing material. As the fabric layer, for example, a woven fabric or a nonwoven fabric made of cellulose fibers can be used. The fabric layer may, for example, comprise a twill weave, a plain weave or a satin weave. Both the warp and weft yarns in the fabric layer may be comprised of cellulose fibers. The nonwoven fabric may be, for example, a random fiber nonwoven fabric. The fabric layer makes the sealing material particularly thin. The sealing material therefore has a small thickness transversely to the main direction of extension of the sealing material. The sealing material can thus also be used particularly well at narrow locations or even be placed partly inside the pipe, without the sealing material affecting the further connection of the pipe to other pipes. In one embodiment, the textile layer made of cellulose fibers constitutes the sealing material.
In one embodiment, the sealing material has the shape of a wedge, wherein the wedge is configured as a three-dimensional body. The wedge shape is preferably formed by cellulose fibers, and the cellulose fibers are thus formed into a wedge shape in the sealing material. In this case, the direction of extent of the three-dimensional body should be perpendicular to the main direction of extent which is hardly negligible/significant. Such wedges can be made, for example, of short fibers or staple fibers, which are pressed into a wedge shape in a randomly arranged manner, preferably in the wet state. The wedge should preferably be compressible at least once, so that for sealing the pipe, for example, the wedge can be pressed against the region to be sealed and wound around the region. In one embodiment, the wedges comprise cellulose pulp that swells when contacted with water. This results in a particularly good adaptation of the sealing material to the pipe to be sealed, the pulp swelling and the wedge being pressed tightly into the location to be sealed. On the other hand, the cellulose fibers shrink upon contact with water, thereby reducing the wrapping radius of the wedge around the pipe and tightening the wedge tighter onto the pipe. In one embodiment, the sealing material is constituted by wedges made of cellulose fibres.
The sealing material may contain a filler, wherein the proportion of filler in the sealing material should be less than 10%, preferably less than 5%. Swelling agents and/or polymeric materials may be used as fillers, for example.
In one embodiment, the swelling agent is cellulose pulp and/or cellulose floc (Celluloseflocken). By using a swelling agent made of the same material as the fibres, the sealing material has less different components and can therefore be recycled particularly well.
In one embodiment, the polymeric material is a thermoplastic or thermoset. When using thermoplastic materials, the sealing material can be heated, for example, as often as desired and readjusted, for example, around the pipe. The use of a thermoset has the advantage that once the thermoset is fully crosslinked, a virtually unchangeable seal material can be produced.
If the sealing material comprises a polymer, the polymer material is preferably located on the outer side of the sealing material facing away from the pipe. This means that the outer surface of the sealing material which is not in direct contact with the pipe has a polymer in the form of a thermoplastic or a thermoset. Preferably, the polymer material is designed to be at least slightly elastic, so that it can be strained together with the cellulose fibres and no cracks are formed in the polymer material. When the sealing material has a swelling agent, a certain elasticity of the polymer material is also important. The polymer material is also preferably compatible with swelling without the formation of cracks in the polymer material.
As polymer materials, preference is given to using polypropylene, polyamide, polylactide, polybutylene adipate/terephthalate, polyethylene terephthalate, polyurethane, polyvinyl chloride, polyethylene or mixtures of the abovementioned substances.
Preferably, the sealing material has the polymer material as particles, flock and/or powder on the outer side of the sealing material facing away from the pipe. In one embodiment, the polymeric material preferably does not initially form a closed layer on the outside of the sealing material. The cellulose fibers may, for example, have polymer particles, wherein the particles are located only at discrete locations outside the fibers. For this purpose, for example, the polymer particles can be sprinkled onto the cellulose fibers after they have been formed into the shape (ribbon, thread, fabric layer, wedge) for the sealing material, wherein the attachment of the polymer particles to the fibers can be achieved by a slight application of heat. When the sealing material is attached to the pipe, the sealing material may be heated so that the polymer material melts and forms a continuous layer on the outside of the layer material. The sealing material can thus advantageously be protected against external conditions, such as friction or weather-related influences, and the sealing life of the pipe is particularly long.
In another embodiment, the polymeric material is also located on the outside of the sealing material and thus is not in direct contact with the pipe to be sealed, but the polymeric material forms a substantially continuous layer on the outside of the sealing material without any further treatment of the polymeric material. For example, the polymeric material may be applied as a melt onto a fine ribbon made of cellulose fibers. In this case, the sealing material has an inner side and an outer side. The inner side is free of a coating of polymeric material and must be in contact with the pipe. The sealing material can still shrink on the inside because the cellulose fibres can come into contact with water from the pipe. However, the outside of the sealing material is coated with a polymer material, whereby the sealing material may, for example, roll up and/or unroll well and, furthermore, when the sealing material is mounted on a pipe, the sealing material may be protected from external influences. The service life of the sealing material is extended here because the sealing material is protected against friction or other external conditions (e.g. weathering).
In both embodiments involving polymeric materials, the sealing material may have a swelling agent on the inside, such as cellulose pulp or cellulose wadding.
Another subject of the invention relates to a method for externally sealing a pipe conveying a liquid using a sealing material, as described above, said sealing material comprising a polymeric material. For sealing, a sealing material is wrapped or applied around the pipe site to be sealed, and then the polymeric material on the outside of the sealing material is activated. Preferably, activation of the polymeric material results in the polymeric material forming a continuous layer. Thereby, the outer surface (outer surface) of the sealing material is closed by the polymer material. The activation of the polymer material is carried out by means of energy supply, for example in the form of heat or radiation of a certain wavelength. By continuous layer of polymer material is meant herein that the polymer material forms a substantially closed surface on the outside of the sealing material. If the outer surface of the sealing material, which is not coated with the polymer material, is less than 15%, less than 10%, less than 5%, there is a closed surface.
All embodiments mentioned in connection with the sealing material may also be applied to the sealing material usable in the method.
Claims (15)
1. A sealing material for externally sealing a conduit for transporting a liquid, wherein the sealing material comprises 90% by weight of cellulose fibres, based on the total weight of the sealing material, and the cellulose fibres are present in the sealing material as yarns, ribbons, threads, wedges or layers of fabric.
2. The sealing material according to claim 1, wherein the cellulose fibres are present as continuous fibres, rod-like fibres and/or random fibres in yarns, ribbons, layers, wedges or threads.
3. The sealing material according to claim 1 or 2, wherein the length of the cellulose fibres is reduced by at least 2% and at most 20% upon contact with an aqueous liquid compared to the original length of the cellulose fibres.
4. The sealing material according to at least one of the preceding claims, wherein the cellulose fibres are viscose fibres, lyocell fibres, modal fibres, cuprammonium fibres, cotton fibres or a mixture of the aforementioned fibres.
5. The sealing material of at least one of the preceding claims wherein the yarns are filament yarns or staple yarns or a mixture of both yarns.
6. The sealing material according to at least one of the preceding claims, wherein the cellulose fibres are present in a unidirectional arrangement in the fine strip in a single layer or in multiple layers.
7. The sealing material according to at least one of the preceding claims, wherein the cellulose fibres are present in the thread at 50 to 200 turns/m, preferably 100 turns/m.
8. The sealing material according to at least one of the preceding claims, the textile layer being configured as a woven or non-woven fabric.
9. The sealing material according to at least one of the preceding claims, wherein the wedge is configured as a three-dimensional body.
10. Sealing material according to at least one of the preceding claims, wherein the sealing material contains less than 10% of fillers, wherein the fillers are for example swelling agents and/or polymeric materials.
11. The sealing material of claim 10 wherein the swelling agent is cellulose pulp or cellulose floe.
12. The sealing material of claim 10 or 11 wherein the polymeric material is a thermoplastic or thermoset.
13. The sealing material according to claims 10 to 12, wherein the polymer material is present on an outer side of the sealing material facing away from the pipe.
14. The sealing material according to any one of claims 10 to 13, wherein the polymer material is present as particles, flock and/or powder on an outer side of the sealing material facing away from the pipe.
15. A method of externally sealing a liquid conveying pipe using a sealing material according to any one of claims 1 to 14, characterised in that the sealing material is wrapped or applied around the pipe site to be sealed and the polymeric material on the outside of the sealing material is then activated so that the outer surface of the sealing material is closed by the polymeric material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020130480.3 | 2020-11-18 | ||
| DE102020130480.3A DE102020130480A1 (en) | 2020-11-18 | 2020-11-18 | Sealing material with cellulose fibers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114517832A true CN114517832A (en) | 2022-05-20 |
Family
ID=81345774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110018350.0A Pending CN114517832A (en) | 2020-11-18 | 2021-01-07 | Sealing material with cellulose fibres |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114517832A (en) |
| DE (1) | DE102020130480A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3328769A1 (en) | 1983-08-10 | 1985-06-20 | Frenzelit Werke Gmbh & Co Kg | Gasket material containing reinforcing and process fibre fractions composed of bast fibres |
| ATE167828T1 (en) | 1994-12-01 | 1998-07-15 | Akzo Nobel Nv | SEALING TAPE FOR SEALING PIPE CONNECTIONS |
| DE19800489A1 (en) | 1998-01-09 | 1999-07-15 | Thomas Prof Dr Mang | Polysaccharide-containing sealing composition |
| DE19920225B4 (en) | 1999-05-03 | 2007-01-04 | Ecco Gleittechnik Gmbh | Process for the production of reinforcing and / or process fibers based on vegetable fibers |
| DE19928169A1 (en) | 1999-06-19 | 2000-12-21 | Thomas Mang | Water-swelling, single component, moisture curing sealing composition used in building, comprises a polymer forming matrix and saccharides/inorganic clay and highly absorbent polymer |
-
2020
- 2020-11-18 DE DE102020130480.3A patent/DE102020130480A1/en not_active Withdrawn
-
2021
- 2021-01-07 CN CN202110018350.0A patent/CN114517832A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020130480A1 (en) | 2022-05-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220520 |