GB2079669A - Intumescent fire seals - Google Patents
Intumescent fire seals Download PDFInfo
- Publication number
- GB2079669A GB2079669A GB8120163A GB8120163A GB2079669A GB 2079669 A GB2079669 A GB 2079669A GB 8120163 A GB8120163 A GB 8120163A GB 8120163 A GB8120163 A GB 8120163A GB 2079669 A GB2079669 A GB 2079669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- intumescent
- intumescent material
- cover
- extruder
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 70
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 7
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 7
- 230000006866 deterioration Effects 0.000 claims abstract description 5
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 4
- 230000004913 activation Effects 0.000 claims abstract description 3
- 239000011162 core material Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000012744 reinforcing agent Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Fire seals having an intumescent strip encased in a plastics cover may be prepared without the need for cutting of the intumescent material, which may lead to the deterioration thereof, by extruding a core of intumescent material, such as one based on hydrated sodium silicate, and subsequently extruding a cover e.g. of polyvinylchloride, which encapsulates the extruded core of intumescent material. Apparatus for making such a fire seal includes first and second means, for extruding the core and cover respectively, and may comprise a single die head having a first (12) and a second (18) die for respectively extruding the core and cover, followed by a sealing bath (30) which prevents activation of the intumescent material. The die (12) is provided with heat insulation (40). Alternatively, extrusion may be effected from separated die heads, between which the core is coated and may be rolled, flattened or stretched, to orientate reinforcing fibres of the core. <IMAGE>
Description
SPECIFICATION
Intumescent fire seals
The present invention relates to intumescentfire seals and more particularly relates to a process and
an apparatus for producing intumescent fire seals.
Fire seals having an intumescent strip encased in a
plastics cover, usually of polyvinylchloride, are
known. Construction of these seals is achieved by
extruding the casing, inserting strips of the intumes
cent material into the casing and then securing the
intumescent strips therein using an adhesive. The
intumescent material, such as "Palusol" (Registered
Trade Mark) is normally supplied in sheets and has
to be cut into strips.
Producing intumescent seals in this way is unde
sirable since it is labour intensive and during curring
exposes the edges of the intumescent strip to the
atmosphere which can result in adsorption of mois
turn which causes deterioration of the intumescent
material. Accordingly, prior to insertion of the strip
into the cover, the edges have to be coated with a
barrier material which prevents adsorption of mois
ture.
It is a general aim of the present invention to
provide a process for the production of an intumes
cent fire seal which avoids the above mentioned
drawbacks.
According to one aspect of the present invention
there is provided a process for producing an in
tumescent fire seal which comprises the steps of
extruding a core of intumescent material and subse
quently extruding a cover which encapsulates the
extruded core of intumescent material. According to
another aspect of the present invention there is
provided an apparatus for the production of an
intumescent fire seal which comprises first extrusion
means for extruding a core of intumescent material
and second extrusion means for extruding a cover
for encapsulation of the extruded core of intumes
cent material.
Extrusion of the core and cover may be performed
separately using separate extruders, a first extruder
producing the core of intumescent material which is
then cooled and fed through a second extruder
which produces the covering. When the intumescent
material used is "Palusol", some disorientation of
the glass fibre reinforcing agent included in the
"Palusol" may occur and it may be necessary to
re-orient the fibres to be parallel to the surface of the
extruded core. This may conveniently be achieved
by performing a rolling, flattening and or stretching
operation on the "Palusol" extrudate after it issues
from the first extruder but before encapsulation by
the cover, for example before feeding thereof into
the cross-head of the second extruder.Alternatively,
the core and cover may be produced within the same
extruder having two extruding dies, a first die for
producing the core of intumescent material and a
second die downstream from the first die and which
produces the covering.
The rate of feed of the intumescent core through
the second die is controlled so as to ensure that the cient to curse the intumescent material to intumesce. If the intumescent material used is "Palusol" it is generally preferred, however, to employ two extruders as described above.
Other aspects of the present invention will now be described with reference to the sole accompanying drawing, which is a schematic longitudinal section through part of an extruder die assembly according to the present invention.
The process according to the present invention is hereinafter described using hydrated sodium silicate, for example of the type sold as "Palusol" as the intumescent material and polyvinylchloride as a suitable plastics material for forming the cover. It will be appreciated however that other suitable intumescent materials and plastics materials may be use if desired.
As seen in the drawing, the die assembly 10 includes a first die 12 which extrudes the intumescent material 13 to form a core 14. The core 14 passes through a chamber 16 and through a second die 18 which extrudes a cover 20 from polyviny Ichloride 21. The intumescent material intumesces at 1 000C if exposed to that temperature for a sufficient time to cause boiling of water contained therein. In the present instance exposure to a temperature in excess of 1 00#C for more than 2 seconds is sufficient time to cause intumescence to occur.
Accordingly, the rate of flow of intumescent material through the die assembly is chosen to ensure that the intumescent material travels from the first die, out of the second die and into a cooling bath 30 to attain a temperature below 1 00#C within a time period less than the activation period of the intumescent material, in this case in less than 2 seconds. Preferably the intumescent material is cooled within the bath to a temperature below 100#C within 21 to 1 second after leaving the first die.
The intumescent material 14 is extruded at the lowest temperature possible, approximately 80 C, and in orderto protect it from heat conduction from the molten polyvinylchloride (which is at a temperature of about 1 75 C) a heat insulating layer 40 is provided to insulate the intumescent material prior to extrusion.
The distance between the first and second die is chosen to be a minimum bearing in mind that the distance should be sufficient to enable the polyviny Bichloride to adhere to the core material without the creation of air gaps.
An intumescent strip formed in accordance with the above process possesses a core of intumescent material which is protected by the cover from the ingress of moisture and also carbon dioxide both of which cause deterioration of the intumescent material.
1. A process for producing an intumescent fire seal which comprises the steps of extruding a core of intumescent material and subsequently extruding a cover which encapsulates the extruded core of intumescent material.
s A rarnecxee ne rolnimod in Claim 1 wherein
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (18)
1. A process for producing an intumescent fire seal which comprises the steps of extruding a core of intumescent material and subsequently extruding a cover which encapsulates the extruded core of intumescent material.
s A rarnecxee ne rolnimod in Claim 1 wherein extrusion of the core and cover is performed separately using separate extruders.
3. A process as claimed in Claim 2 wherein extrusion of the core is performed in a first extruder and the thus formed core is cooled and then fed through a second extruder for production of the covering.
4. A process as claimed in Claim 3 which further comprises rolling, flattening and/or stretching the extruded core of intumescent material before feeding thereof through the second extruder.
5. A process as claimed in Claim 1 wherein the core of intumescent material and the cover are produced within a single extruder having two extruding dies.
6. A process as claimed in Claim 5 which further comprises insulating the intumescent material with a heat insulating layer prior to extrusion thereof.
7. A process as claimed in any of Claims 1 to 6 wherein the core and cover are cooled after encapsulating the core with the cover.
8. A process as claimed in any of Claims 1 to 7 wherein the intumescent material comprises hydrated sodium silicate.
9. A process as claimed in Claim 8 wherein the intumescent material is extruded at a temperature of approximately 80cm.
10. A process for producing an intumescent fire seal substantially as herein described with reference to the accompanying drawing.
11. An apparatus for the production of an intumescent fire seal which comprises first extrusion
means for extruding a core of intumescent material and second extrusion means for extruding a cover for encapsulation of the extruded core of inteumes#cent material.
12. An apparatus as claimed in Claim 11 wherein the first extrusion means is constituted by a first extruder and the second extrusion means is contituted by a second extruder.
13. An apparatus as claimed in Claim 12 which further comprises cooling means intermediate the first and second extruders for cooling the extruded core before feeding through the second extruder.
14. An apparatus as claimed in Claim 12 or Claim 13 which further comprises rolling, flattening andíor stretching means positioned intermediate the first and second extruders for rolling, flattening and/or stretching the extruded core before feeding thereof through the second extruder.
15. An apparatus as claimed in Claim 11 wherein the first and second extrusion means comprises first and second dies within a single extruder.
16. An apparatus as claimed in Claim 15 which further comprises cooling means downstream of the extruder for cooling the extruded core and encapsulating cover.
17. An apparatus as claimed in Claim 15 or Claim 16 which further comprises means for providing a heat insulating layer around the intumescent material prior to extrusion thereof.
18. An apparatus for the production of an intumescent fire seal substantially as herein described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8120163A GB2079669B (en) | 1980-07-01 | 1981-06-30 | Intumescent fire seals |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8021493 | 1980-07-01 | ||
| GB8120163A GB2079669B (en) | 1980-07-01 | 1981-06-30 | Intumescent fire seals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2079669A true GB2079669A (en) | 1982-01-27 |
| GB2079669B GB2079669B (en) | 1985-02-13 |
Family
ID=26276052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8120163A Expired GB2079669B (en) | 1980-07-01 | 1981-06-30 | Intumescent fire seals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2079669B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2202484A (en) * | 1987-03-20 | 1988-09-28 | Keith Richard Patterson | Extruding sheaths around intumescent cores |
| GB2298159A (en) * | 1995-06-02 | 1996-08-28 | Reddiplex Group Plc | Intumescent strip extruded into cavity of a carrier |
| WO1997040971A1 (en) * | 1996-04-26 | 1997-11-06 | Reddiplex Group Plc | Intumescent strip |
| EP1215420A2 (en) | 2000-12-12 | 2002-06-19 | Marvon S.r.l. | Reinforced intumescent gasket |
| WO2003064801A1 (en) | 2002-01-31 | 2003-08-07 | Doors & More Srl | Intumescent seal |
| EP1619345A2 (en) | 2004-07-23 | 2006-01-25 | INTUMEX GmbH | Intumescent clip-type section member for fireproof installations |
| EP2412409A1 (en) * | 2010-07-28 | 2012-02-01 | Posa S.P.A. | Single-body intumescent gaskets for cold and hot smoke sealing, in particular for fire dampers |
| DE102010039347A1 (en) | 2010-08-16 | 2012-02-16 | Basf Se | Producing a fire protection element comprises co-extruding a profile with an intumescent composition, based on silicate as a core material and a thermoplastic polymer as the sheath |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747074B1 (en) | 1999-03-26 | 2004-06-08 | 3M Innovative Properties Company | Intumescent fire sealing composition |
| FR3072041B1 (en) | 2017-10-09 | 2019-11-29 | Railtech International | MOLDING ASSEMBLY FOR ALUMINO-THERMAL RAIL SOLDERING AND ALUMINO-THERMAL RAILS SOLDERING PROCESS |
-
1981
- 1981-06-30 GB GB8120163A patent/GB2079669B/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2202484A (en) * | 1987-03-20 | 1988-09-28 | Keith Richard Patterson | Extruding sheaths around intumescent cores |
| GB2202484B (en) * | 1987-03-20 | 1990-08-15 | Keith Richard Patterson | Improvements relating to tubular extrusions |
| GB2298159A (en) * | 1995-06-02 | 1996-08-28 | Reddiplex Group Plc | Intumescent strip extruded into cavity of a carrier |
| EP0745751A3 (en) * | 1995-06-02 | 1997-07-09 | Reddiplex Group Plc | Intumescent strip |
| GB2298159B (en) * | 1995-06-02 | 1999-08-11 | Reddiplex Group Plc | Method of making an intumescent strip |
| WO1997040971A1 (en) * | 1996-04-26 | 1997-11-06 | Reddiplex Group Plc | Intumescent strip |
| EP1215420A2 (en) | 2000-12-12 | 2002-06-19 | Marvon S.r.l. | Reinforced intumescent gasket |
| WO2003064801A1 (en) | 2002-01-31 | 2003-08-07 | Doors & More Srl | Intumescent seal |
| EP1619345A2 (en) | 2004-07-23 | 2006-01-25 | INTUMEX GmbH | Intumescent clip-type section member for fireproof installations |
| EP2412409A1 (en) * | 2010-07-28 | 2012-02-01 | Posa S.P.A. | Single-body intumescent gaskets for cold and hot smoke sealing, in particular for fire dampers |
| DE102010039347A1 (en) | 2010-08-16 | 2012-02-16 | Basf Se | Producing a fire protection element comprises co-extruding a profile with an intumescent composition, based on silicate as a core material and a thermoplastic polymer as the sheath |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2079669B (en) | 1985-02-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960630 |