CA2054286C - Process for producing a jacketed fuse - Google Patents
Process for producing a jacketed fuse Download PDFInfo
- Publication number
- CA2054286C CA2054286C CA002054286A CA2054286A CA2054286C CA 2054286 C CA2054286 C CA 2054286C CA 002054286 A CA002054286 A CA 002054286A CA 2054286 A CA2054286 A CA 2054286A CA 2054286 C CA2054286 C CA 2054286C
- Authority
- CA
- Canada
- Prior art keywords
- hose
- cord
- fuse
- jacketed
- jacket
- 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 - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C5/00—Fuses, e.g. fuse cords
- C06C5/04—Detonating fuses
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
- B29C63/42—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C5/00—Fuses, e.g. fuse cords
- C06C5/08—Devices for the manufacture of fuses
Abstract
A fuse having a protective jacket is utilized, for example, in petroleum exploration at large depths where the fuse must withstand high temperatures and pressures. The jacket is produced from a shrinkable hose that is shrink-fitted onto the unfinished cord which latter contains an explosive. The hose consists preferably of radiation-crosslinked polyethylene. The use of a shrink-fitted hose eliminates long preparation and curing times for the synthetic resin jacket. The process temperatures required during heat shrinking are no threat to the safety against ignition of the explosive. It is possible in accordance with the process to manufacture, in particular, fuses for high pressures and high ambient temperatures, without any problems.
Description
~ACKGRfjUND p~' TH$ ~NVEN~~ UN
The invention relates to a process far producing a jacketed fuse which must withstand high temperatures and preE~sures, wherein an unfinished Gore of explosive material is surrounded by a jacket of a synthetic resin which is shrinkable end to the fuse product.
German Utility Modal 7,003,114 discloses a fuse resistant against increased temperatures and pressures. Such fuses are required, for example, for seismic measurements of geologioal formations wherein the depth of the borahole can amount to more than 4,000 meters, with rock temperatures of between 130° and 200° C and pressures of up to 1,500 bar.
The conventional fu~te con8ists of an unfinished oord, made up of a wrapped and/or a braid-encased expxosive sore, and a 1~ se~e~ling jacket. Film strips of a temperature- and presraure-r~siatant material are utilized for the sealing jacket. The sealing jacket is covered, in turn, with still further braided threads. Wrapping of the unfinished cord with fi~.m strips is a complicated arid expensive procedure and harbors the danger of laakages. Therefore, in addition to the sealing jacket, an external jacket is additionally needed and is made up of a solution applied by a dipping method.
Such an external jacket, however, due to its minor layer thickness and on account of nonuniform layer thicknesses, can only provide a limited protective function.
It is furthermore known to provide an unfinished cord whioh contains an explosive with a jacketing produced by hot axtrusiori of a synthetic resin, far example polyethylene.
The synthetic resins suitable for hot extrusion require high extrusion temperatures of about 200°C. Since the unfinished cord contains an explosive, according to the nature of the explosive used in a particular case, a considerable safety risk is incurred during encasing of this unfinished cord with a hot plastic, because there is the danger that the explosive will be ignited. In order to counteract this danger, the jacketing is applied by a cold extrusion method, using cold-extrusible synthetic resins which are subsequently hardened by drying. The preparation of the raw material extrudable composition necessary for this purpose takes at least three weeks, and at least six additional weeks are needed for curing the jacket. This extraordinarily prolonged manufacturing process is accompanied by considerable costs and large expenditure for storage.
SUMMARY OF THE INVENTION
This invention is based on the object of designing a process for forming a protective jacket on an unfinished explosive-containing cord in such a way that the jacket can be applied to the unfinished cord in an economical fashion, rapidly, and without any major safety risk.
According to the present invention, there is provided a process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being contacted with an oxygen-containing gas said hose having an inner diameter that is substantially greater than an outer diameter of the cord, and contacting the hose with said gas to shrink the hose onto the cord to provide the jacketed fuse.
According to. the present invention, there is also provided a process for producing a jacketed fuse wherein a cord comprising a preshaped eleongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord, the non-j acketed cord being introduced into the hose by blowing a gas through the hose and entraining the cord with the gas, and treating the hose to shrink the hose onto the cord to provide the jacketed fuse.
Preferably, in the process of this invention, a shrinkable stretched hose is utilized as the synthetic resin jacket or casing; this hose is shrink-fitted onto the unfinished cord. The shrinking step can be performed, for example, by contact with air. The synthetic resin material required for this purpose is packaged in a vacuum- and/or air-tight fashion. Upon opening of the package, the shrinking process commences. In particular, however, the shrinking is caused under the action of heat. A shrinkable polymer or resin suitable for the hose is, in particular, shrinkable crosslinked polyethylene. However, it is likewise suitable to use other shrinkable polymers, such as, for example, shrinkable crosslinked "Neoprene" or "Viton". Radiation-crosslinked polymers are employed with preference. Although heat is utilized especially for the shrinking step, the temperatures needed for this purpose are not so high as to seriously evoke the danger of the explosive.
Preferably, the process of this invention is especially suitable for the manufacture of fuses which must exhibit high temperature stability and pressure resistance in order to meet, for example, the requirement of a temperature stability of 180°C and a pressure resistance of 1,000 bar over a time period of at least two hours without any problems. A casing of PVC. would not be suited for such a fuse inasmuch as PVC softens at about 100°C. Of course, in case of a fuse having the required properties, the unfinished cord must also be designed for being resistant against pressure and temperature to the respectively necessary extent.
Preferably, a suitable process for introducing the unfinished cord into the not yet shrunk hose of stretched synthetic resin provides that a gas, for example air, is blown through the hose, and the unfinished cord is entrained by the air in accordance with the injector principle. Fuses can have a length of several meters, e.g.
20 meters. Introduction of the unfinished cord into the hose then takes place by the injection of air. After introduction, a further positioning step can, of course, be carried out additionally by further insertion of the cord by hand.
The invention furthermore concerns a fuse manufactured according to the process of this invention wherein the jacket consists of a shrink-fitted hose.
According to the present invention, there is also provided a jacketed fuse comprising a cord comprising a preshaped elongated explosive, which cord is surrounded by a jacket, characterized in that the jacket consists of a shrunk-fitted hose of synthetic resin which tightly contacts the outer contour of the core, the preshaped elongated explosive having a wrapping of a cover layer that is surrounded and contacted by said jacket.
According to the present invention, there is also provided a process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord, and treating the hose onto shrink the hose onto the cord to provide the jacketed fuse;
the cord comprising the preshaped elongated explosive being wrapped in a cover layer and being disposed centrally within the hose with the formation of an annular air gap prior to treating the hose to shrink the hose onto the cord.
Preferably, the jacket, is under tension, in firm contact with the periphery of the unfinished cord and adapts to the contours of the cord while the thickness of the jacket is the same at all points.
The process according to this invention has the advantage of low process temperatures which are acceptable from a safety standpoint. There is no need for long preparation and curing times.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below with reference to the accompanying drawings wherein, in schematic representation and at varying scale:
4a 4b Figure 1 is a longitudinal section showing the situation during shrink-fitting of the hose onto the "n f i n i ~hec~ cord 2~~!~~~~
shown in plan view;
Figure 2 shows, for clarifying the dimensions, a sact.'lon along line II-II of Figure 1;
Figure 3 shows a fragmentary viraw of a devioe for 3 introducing the unfinished cord into the hose; and Figuxe 4 shows the heating tunnel with accessories fvr the shrink-fitting of the hose.
IyE'j,'p~LED DESCRIP',~'~~,QN d~' "rliE INVEN'~,'ION
According to the drawings, an unfinished cord 1o which contains an explossive and is wrapped or encased by one or several cov~ar layers i.s~ provided with a packet 11 firmly surrounding the unfinished acrd 10 under tension.
The unfinished cord 10 contains, far example, an explosive gtr~ble up to about 1B0° C and up to a pressure of about 1,000 bar. Such an explosive is aatogeh, for example.
pot the casing, a heat-shrinkable, prestretched and preformed hose 12 stabilized by radiation crosslinking is utilized; the internal diameter of this hose is larger, preferably substantially larger, than the diameter of the unfinished cord 10. This hose 12 is eut to the same length as the unfinfshed cord 10, Ear example to a length of ZO m.
Then -- as described in greater dete~i.l in aonneCtion with Figure 3 -- air or another gas is blown into the hose 12 and, at the same time, the unfinished card l0 is introduced into the hose 12. The unfinished cord 10 is entra~,ned by the gag .1~J is..
flowing through the hose 12.
In Figure 1, to simplify the illustration of the drawing, the unfinished c~rrd 10 is shown coax.ially arranged in the hr~~se 12t whereas in reality the cord is in contact with the inner wall of the,hose 12 in the lower zons~ of the latter, as indiaatad in Figure 2 by the circle 13 in dat~dash linen.
In the in'je~ctor device 14 shown in a sectional view in Figure 3, the unrinighed cord 10, illustrated in plan view, is extended through the feeding tube 15. This tube is surrounded by the air-conducting tube 17 with formation of an annular gap 16. Both tubes 15, 17 are held in the housing 18 in mutually ooaxial arrangement. The nipple-like air-conducting tube i'7 serves simultaneously fox accommodating on~a end iZ~ of th~ shrinking hose 12, the hose ~xnd pushed over the nipple 1e optionally pressed into contact therewith additionally dry hand. When feeding air under pressure to the housing 1B in corregpondenae with arrow A, then this air flows -- asc indicated by the straws B -- at a correspondingly 2o increased velocity through tha annular gap is and exits at the end 17~ Zrom the air-conducting tube 17 and thus enters the hose 12, entraining the unfinished cord to thereby according to arrow C in correspondence with'the injector principle. mhe unfini~thed cord 10 is transported during this step, so to speak, on an air aushioh and drawn into the hose 12. The diameter of the unfinished cord aan here amount up to about 20 mm.
The invention relates to a process far producing a jacketed fuse which must withstand high temperatures and preE~sures, wherein an unfinished Gore of explosive material is surrounded by a jacket of a synthetic resin which is shrinkable end to the fuse product.
German Utility Modal 7,003,114 discloses a fuse resistant against increased temperatures and pressures. Such fuses are required, for example, for seismic measurements of geologioal formations wherein the depth of the borahole can amount to more than 4,000 meters, with rock temperatures of between 130° and 200° C and pressures of up to 1,500 bar.
The conventional fu~te con8ists of an unfinished oord, made up of a wrapped and/or a braid-encased expxosive sore, and a 1~ se~e~ling jacket. Film strips of a temperature- and presraure-r~siatant material are utilized for the sealing jacket. The sealing jacket is covered, in turn, with still further braided threads. Wrapping of the unfinished cord with fi~.m strips is a complicated arid expensive procedure and harbors the danger of laakages. Therefore, in addition to the sealing jacket, an external jacket is additionally needed and is made up of a solution applied by a dipping method.
Such an external jacket, however, due to its minor layer thickness and on account of nonuniform layer thicknesses, can only provide a limited protective function.
It is furthermore known to provide an unfinished cord whioh contains an explosive with a jacketing produced by hot axtrusiori of a synthetic resin, far example polyethylene.
The synthetic resins suitable for hot extrusion require high extrusion temperatures of about 200°C. Since the unfinished cord contains an explosive, according to the nature of the explosive used in a particular case, a considerable safety risk is incurred during encasing of this unfinished cord with a hot plastic, because there is the danger that the explosive will be ignited. In order to counteract this danger, the jacketing is applied by a cold extrusion method, using cold-extrusible synthetic resins which are subsequently hardened by drying. The preparation of the raw material extrudable composition necessary for this purpose takes at least three weeks, and at least six additional weeks are needed for curing the jacket. This extraordinarily prolonged manufacturing process is accompanied by considerable costs and large expenditure for storage.
SUMMARY OF THE INVENTION
This invention is based on the object of designing a process for forming a protective jacket on an unfinished explosive-containing cord in such a way that the jacket can be applied to the unfinished cord in an economical fashion, rapidly, and without any major safety risk.
According to the present invention, there is provided a process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being contacted with an oxygen-containing gas said hose having an inner diameter that is substantially greater than an outer diameter of the cord, and contacting the hose with said gas to shrink the hose onto the cord to provide the jacketed fuse.
According to. the present invention, there is also provided a process for producing a jacketed fuse wherein a cord comprising a preshaped eleongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord, the non-j acketed cord being introduced into the hose by blowing a gas through the hose and entraining the cord with the gas, and treating the hose to shrink the hose onto the cord to provide the jacketed fuse.
Preferably, in the process of this invention, a shrinkable stretched hose is utilized as the synthetic resin jacket or casing; this hose is shrink-fitted onto the unfinished cord. The shrinking step can be performed, for example, by contact with air. The synthetic resin material required for this purpose is packaged in a vacuum- and/or air-tight fashion. Upon opening of the package, the shrinking process commences. In particular, however, the shrinking is caused under the action of heat. A shrinkable polymer or resin suitable for the hose is, in particular, shrinkable crosslinked polyethylene. However, it is likewise suitable to use other shrinkable polymers, such as, for example, shrinkable crosslinked "Neoprene" or "Viton". Radiation-crosslinked polymers are employed with preference. Although heat is utilized especially for the shrinking step, the temperatures needed for this purpose are not so high as to seriously evoke the danger of the explosive.
Preferably, the process of this invention is especially suitable for the manufacture of fuses which must exhibit high temperature stability and pressure resistance in order to meet, for example, the requirement of a temperature stability of 180°C and a pressure resistance of 1,000 bar over a time period of at least two hours without any problems. A casing of PVC. would not be suited for such a fuse inasmuch as PVC softens at about 100°C. Of course, in case of a fuse having the required properties, the unfinished cord must also be designed for being resistant against pressure and temperature to the respectively necessary extent.
Preferably, a suitable process for introducing the unfinished cord into the not yet shrunk hose of stretched synthetic resin provides that a gas, for example air, is blown through the hose, and the unfinished cord is entrained by the air in accordance with the injector principle. Fuses can have a length of several meters, e.g.
20 meters. Introduction of the unfinished cord into the hose then takes place by the injection of air. After introduction, a further positioning step can, of course, be carried out additionally by further insertion of the cord by hand.
The invention furthermore concerns a fuse manufactured according to the process of this invention wherein the jacket consists of a shrink-fitted hose.
According to the present invention, there is also provided a jacketed fuse comprising a cord comprising a preshaped elongated explosive, which cord is surrounded by a jacket, characterized in that the jacket consists of a shrunk-fitted hose of synthetic resin which tightly contacts the outer contour of the core, the preshaped elongated explosive having a wrapping of a cover layer that is surrounded and contacted by said jacket.
According to the present invention, there is also provided a process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord, and treating the hose onto shrink the hose onto the cord to provide the jacketed fuse;
the cord comprising the preshaped elongated explosive being wrapped in a cover layer and being disposed centrally within the hose with the formation of an annular air gap prior to treating the hose to shrink the hose onto the cord.
Preferably, the jacket, is under tension, in firm contact with the periphery of the unfinished cord and adapts to the contours of the cord while the thickness of the jacket is the same at all points.
The process according to this invention has the advantage of low process temperatures which are acceptable from a safety standpoint. There is no need for long preparation and curing times.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below with reference to the accompanying drawings wherein, in schematic representation and at varying scale:
4a 4b Figure 1 is a longitudinal section showing the situation during shrink-fitting of the hose onto the "n f i n i ~hec~ cord 2~~!~~~~
shown in plan view;
Figure 2 shows, for clarifying the dimensions, a sact.'lon along line II-II of Figure 1;
Figure 3 shows a fragmentary viraw of a devioe for 3 introducing the unfinished cord into the hose; and Figuxe 4 shows the heating tunnel with accessories fvr the shrink-fitting of the hose.
IyE'j,'p~LED DESCRIP',~'~~,QN d~' "rliE INVEN'~,'ION
According to the drawings, an unfinished cord 1o which contains an explossive and is wrapped or encased by one or several cov~ar layers i.s~ provided with a packet 11 firmly surrounding the unfinished acrd 10 under tension.
The unfinished cord 10 contains, far example, an explosive gtr~ble up to about 1B0° C and up to a pressure of about 1,000 bar. Such an explosive is aatogeh, for example.
pot the casing, a heat-shrinkable, prestretched and preformed hose 12 stabilized by radiation crosslinking is utilized; the internal diameter of this hose is larger, preferably substantially larger, than the diameter of the unfinished cord 10. This hose 12 is eut to the same length as the unfinfshed cord 10, Ear example to a length of ZO m.
Then -- as described in greater dete~i.l in aonneCtion with Figure 3 -- air or another gas is blown into the hose 12 and, at the same time, the unfinished card l0 is introduced into the hose 12. The unfinished cord 10 is entra~,ned by the gag .1~J is..
flowing through the hose 12.
In Figure 1, to simplify the illustration of the drawing, the unfinished c~rrd 10 is shown coax.ially arranged in the hr~~se 12t whereas in reality the cord is in contact with the inner wall of the,hose 12 in the lower zons~ of the latter, as indiaatad in Figure 2 by the circle 13 in dat~dash linen.
In the in'je~ctor device 14 shown in a sectional view in Figure 3, the unrinighed cord 10, illustrated in plan view, is extended through the feeding tube 15. This tube is surrounded by the air-conducting tube 17 with formation of an annular gap 16. Both tubes 15, 17 are held in the housing 18 in mutually ooaxial arrangement. The nipple-like air-conducting tube i'7 serves simultaneously fox accommodating on~a end iZ~ of th~ shrinking hose 12, the hose ~xnd pushed over the nipple 1e optionally pressed into contact therewith additionally dry hand. When feeding air under pressure to the housing 1B in corregpondenae with arrow A, then this air flows -- asc indicated by the straws B -- at a correspondingly 2o increased velocity through tha annular gap is and exits at the end 17~ Zrom the air-conducting tube 17 and thus enters the hose 12, entraining the unfinished cord to thereby according to arrow C in correspondence with'the injector principle. mhe unfini~thed cord 10 is transported during this step, so to speak, on an air aushioh and drawn into the hose 12. The diameter of the unfinished cord aan here amount up to about 20 mm.
~~~4~a~
Once the unfinished oord 10 has been positioned in the hoses 12 by air entrainment, thermal sthrinking of the previously stretched hose takes plane, for example with the aid of an annular hot~air blower through which the hose~l2 is passted together with the unfinished cord 10; or, conversely, this blower is passed thereover. However, with preference, bshrinking takes place by means of a heating tunnel 19 shown schematically in Figure 4. Under practical conditions, this heating tunnel has a length of abr~ut 5 m and is controlled to be at a temperature of about 150° C. The hose 12 with the unfinished cord 10 disposed therein is p$$sed -- according to the arrow b -- through the heating tunnel at a rate of 1 m/min. This is done by effecting the introduction by way of a belt Peed 20 and the winding-up step via a take-oft la means 21. The feed and take-off means era adapted to each other so that the acrd l0, 12 is tensioned in the heating tunnel. 19. Temperature control oP the heating tunnel 19 is accomplished by means of hot air introduced by meanB og the hat-air blower Z~ and exhausted via the conduit 23, During this step, the hose 12 is shrunk, coming into firm and tight oontact with th8 contour of the unfinished cord 10, with formation oP the jacket 11, and surrounding this cord in a sealing taahion. The extent of reduction at' the diameter of the hose 12 during shrinkage should range between 1 mm and 6 mm.
The shrinking temperatures are dependent on the type of atre~tched and preferably also arosslinked polymer employed, as well as on the temperature stability of the explosive in the unfinished Gord 12. They are, far example for polyethylene, about 14Q-300° C, for neoprene about 175-3b0°
C, arid for ~~Viton~~ about 130-150 C.
B The hose 12 consists preferably of radiatian-Croeslinked polyethylene. In a preferred embodiment with an unfinished cord 10 hawing an outer diameter of 4.9 mm, the outer diameter of the hose 12 prior to shrinking is 6.5 mm, after shrinking o! the hosA 12 into firm tight contact with the contour of the unfinished card 10 and the hose 12 hag an outer diameter of 5.4 mm arid a wall thickness of 0.25 mm. With an unfinished cord l0 based on oatogen, th~.s fuBe has a t.gmperature stability End pr~assure resistance of 180° and 1,000 bar, and 175° c and 1,440 bar, respectively, s~w~r a time period of at ,east 2 hr~urs.
Once the unfinished oord 10 has been positioned in the hoses 12 by air entrainment, thermal sthrinking of the previously stretched hose takes plane, for example with the aid of an annular hot~air blower through which the hose~l2 is passted together with the unfinished cord 10; or, conversely, this blower is passed thereover. However, with preference, bshrinking takes place by means of a heating tunnel 19 shown schematically in Figure 4. Under practical conditions, this heating tunnel has a length of abr~ut 5 m and is controlled to be at a temperature of about 150° C. The hose 12 with the unfinished cord 10 disposed therein is p$$sed -- according to the arrow b -- through the heating tunnel at a rate of 1 m/min. This is done by effecting the introduction by way of a belt Peed 20 and the winding-up step via a take-oft la means 21. The feed and take-off means era adapted to each other so that the acrd l0, 12 is tensioned in the heating tunnel. 19. Temperature control oP the heating tunnel 19 is accomplished by means of hot air introduced by meanB og the hat-air blower Z~ and exhausted via the conduit 23, During this step, the hose 12 is shrunk, coming into firm and tight oontact with th8 contour of the unfinished cord 10, with formation oP the jacket 11, and surrounding this cord in a sealing taahion. The extent of reduction at' the diameter of the hose 12 during shrinkage should range between 1 mm and 6 mm.
The shrinking temperatures are dependent on the type of atre~tched and preferably also arosslinked polymer employed, as well as on the temperature stability of the explosive in the unfinished Gord 12. They are, far example for polyethylene, about 14Q-300° C, for neoprene about 175-3b0°
C, arid for ~~Viton~~ about 130-150 C.
B The hose 12 consists preferably of radiatian-Croeslinked polyethylene. In a preferred embodiment with an unfinished cord 10 hawing an outer diameter of 4.9 mm, the outer diameter of the hose 12 prior to shrinking is 6.5 mm, after shrinking o! the hosA 12 into firm tight contact with the contour of the unfinished card 10 and the hose 12 hag an outer diameter of 5.4 mm arid a wall thickness of 0.25 mm. With an unfinished cord l0 based on oatogen, th~.s fuBe has a t.gmperature stability End pr~assure resistance of 180° and 1,000 bar, and 175° c and 1,440 bar, respectively, s~w~r a time period of at ,east 2 hr~urs.
Claims (12)
1. A process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being contacted with an oxygen-containing gas, said hose having an inner diameter that is substantially greater than an outer diameter of the cord; and contacting the hose with said gas to shrink the hose onto the cord to provide the jacketed fuse.
2. A process for producing a jacketed fuse wherein a cord comprising a preshaped eleongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord, the non-jacketed cord being introduced into the hose by blowing a gas through the hose and entraining the cord with the gas, and treating the hose to shrink the hose onto the cord to provide the jacketed fuse.
3. A process according to claim 2, charac-terized in that the hose is made of a heat shrinkable synthetic resin and the hose is treated with heat.
4. A process according to claim 3, charac-terized in that the hose with the cord disposed therein is conducted through a heating tunnel to effect shrinking of the hose.
5. A process according to claim 3, charac-terized in that the hose consists of a crosslinked polymer.
6. A process according to claim 5, charac-terized in that the hose is polyethylene.
7. A process according to one of claim 1, characterized in that the hose outer diameter is reduced to approximately one-half during the shirking operation.
8. A jacketed fuse comprising a cord comprising a preshaped elongated explosive, which cord is surrounded by a jacket, characterized in that the jacket consists of a shrunk-fitted hose of synthetic resin which tightly contacts the outer contour of the core, the preshaped elongated explosive having a wrapping of a cover layer that is surrounded and contacted by said jacket.
9. A process for producing a jacketed fuse wherein a cord comprising a preshaped elongated explosive is surrounded by a synthetic resin jacket, characterized by positioning the cord within a shrinkable hose made of a synthetic resin which shrinks upon being treated, said hose having an inner diameter that is substantially greater than an outer diameter of the cord; and treating the hose to shrink the hose onto the cord to provide the jacketed fuse, the cord comprising the preshaped elongated explosive being wrapped in a cover layer and being disposed centrally within the hose with the formation of an annular air gap prior to treating the hose to shrink the hose onto the cord.
10 10. A jacketed fuse according to claim 8, characterized in that the shrunk-fitted hose and the fuse exhibit a temperature stability of at least about 150°C and a pressure resistance of at least bout 800 bar.
11. A jacketed fuse according to claim 8, characterized in that the hose consists of a crosslinked polymer.
12. A jacketed fuse according to claim 11, characterized in that the polymer is polyethylene.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4034264 | 1990-10-27 | ||
| DEP4034264.6 | 1990-10-27 | ||
| DE4131711 | 1991-09-24 | ||
| DEP4131711.4 | 1991-09-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2054286A1 CA2054286A1 (en) | 1992-04-28 |
| CA2054286C true CA2054286C (en) | 2002-08-27 |
Family
ID=25898056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002054286A Expired - Lifetime CA2054286C (en) | 1990-10-27 | 1991-10-25 | Process for producing a jacketed fuse |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0483657B1 (en) |
| AT (1) | ATE120163T1 (en) |
| CA (1) | CA2054286C (en) |
| DE (2) | DE59104993D1 (en) |
| ES (1) | ES2070391T3 (en) |
| GR (1) | GR3015619T3 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2685813A (en) * | 1951-09-18 | 1954-08-10 | Northrop Aircraft Inc | Prefabricated glass fiber rivet body |
| FR2043961A5 (en) * | 1969-05-05 | 1971-02-19 | France Etat | |
| US3712222A (en) * | 1970-03-12 | 1973-01-23 | Brunswick Corp | Pyrotechnic fuse |
| FR2159724A5 (en) * | 1971-11-10 | 1973-06-22 | Signund Frank | Plastic clad pipes mfr - by heat shrinking prefabricated (polyethylene) sheath onto heated pipe |
| US3968724A (en) * | 1974-10-03 | 1976-07-13 | The United States Of America As Represented By The Secretary Of The Army | Method for accurately varying the density of a powder or powder charge, and shrink tubes for use therewith |
| US4913053A (en) * | 1986-10-02 | 1990-04-03 | Western Atlas International, Inc. | Method of increasing the detonation velocity of detonating fuse |
| GB2204932B (en) * | 1987-05-14 | 1991-12-11 | Usui Kokusai Sangyo Kk | Flexible composite hose |
-
1991
- 1991-10-23 DE DE59104993T patent/DE59104993D1/en not_active Expired - Lifetime
- 1991-10-23 ES ES91118058T patent/ES2070391T3/en not_active Expired - Lifetime
- 1991-10-23 DE DE4134996A patent/DE4134996A1/en not_active Withdrawn
- 1991-10-23 AT AT91118058T patent/ATE120163T1/en not_active IP Right Cessation
- 1991-10-23 EP EP91118058A patent/EP0483657B1/en not_active Expired - Lifetime
- 1991-10-25 CA CA002054286A patent/CA2054286C/en not_active Expired - Lifetime
-
1995
- 1995-03-24 GR GR950400696T patent/GR3015619T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GR3015619T3 (en) | 1995-06-30 |
| EP0483657B1 (en) | 1995-03-22 |
| EP0483657A1 (en) | 1992-05-06 |
| CA2054286A1 (en) | 1992-04-28 |
| DE4134996A1 (en) | 1992-04-30 |
| DE59104993D1 (en) | 1995-04-27 |
| ATE120163T1 (en) | 1995-04-15 |
| ES2070391T3 (en) | 1995-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |