EP4140973B1 - Suspension of explosive composition of pill fuse head for industrial electric detonators - Google Patents

Suspension of explosive composition of pill fuse head for industrial electric detonators Download PDF

Info

Publication number: EP4140973B1
Authority: EP; European Patent Office
Prior art keywords: portions; pill; suspension; explosive composition; electric
Prior art date: 2021-04-12
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.): Active

Application number

EP22020161.0A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP4140973A1 (en

Inventor

Pavel Valenta

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Austin Detonator sro

Original Assignee

Austin Detonator sro

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.)

2021-04-12

Filing date

2022-04-08

Publication date

2024-02-28

2022-04-08 Application filed by Austin Detonator sro filed Critical Austin Detonator sro

2023-03-01 Publication of EP4140973A1 publication Critical patent/EP4140973A1/en

2024-02-28 Application granted granted Critical

2024-02-28 Publication of EP4140973B1 publication Critical patent/EP4140973B1/en

Status Active legal-status Critical Current

2042-04-08 Anticipated expiration legal-status Critical

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Classifications

- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C7/00—Non-electric detonators; Blasting caps; Primers
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B25/00—Compositions containing a nitrated organic compound
- C06B25/04—Compositions containing a nitrated organic compound the nitrated compound being an aromatic
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B29/00—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate
- C06B29/02—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate of an alkali metal
- C06B29/16—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate of an alkali metal with a nitrated organic compound
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/12—Bridge initiators
- F42B3/128—Bridge initiators characterised by the composition of the pyrotechnic material
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/12—Primers; Detonators electric

Definitions

the invention concerns the suspension of explosive composition of pill fuse head for industrial electric detonators created by dipping technology on its skeleton formed by metal lamellas and a resistance wire.
suspensions of explosive compositions in solutions of nitrocellulose or fluoroelastomer in an organic solvent are used for the technology of the production of electric pill fuse heads by dipping.
Those suspensions contain an explosive based on a lead salt and other components based on lead and non-lead oxidizers, metal powders, and binders, such as mentioned nitrocellulose or fluoroelastomer.
the dipping technology is based on simultaneous immersion of several thousand electric pill skeletons, formed by metal lamellas with a resistance wire, into a suspension of explosive composition, and thus the formation of electric pill fuse heads. These wet fuse heads are then dried out to remove the organic solvent, after which the fuse heads of the electric pills are provided with a lacquer layer of conventional lacquers to ensure mechanical and dimensional strength.
suspensions of explosive composition must exhibit constancy of composition and sedimentation of the individual components must not occur.
the explosive composition of the pill fuse heads after the organic solvents have been dried out, then coats the resistance wire, which is usually made of a NiCr alloy in a weight ratio of 80/20 and whose diameter ranges from 30 to 100 micrometres, or of a CuNi alloy containing 44% Ni, with a diameter of 170 micrometres.
the explosive pill composition determines the electrical parameters of the electric pill with respect to the resistance wire, such as: safe current and ignition current.
the electric pill thus formed can be used in an electric industrial detonator, where, after passing a predefined electrical impulse, the resistance wire of the electric pill is heated and subsequently the pill explosive composition is initiated, the burst of flame of which then transmits the heat burst to the pyrotechnic delay composition of the industrial electric detonator.
the explosive composition must be sufficiently sensitive to the definably heated resistance wire of the electric pill to ignite it.
the created burst of flame, formed by the explosive transformation of the individual components, then must not have an excessive pressure effect, but must have the calorific capacity to initiate the delay pyrotechnic composition of the electric detonator.
CZ294317 discloses a dipping explosive mixture comprising potassium dinitrobenzofuroxanate (KDNBF), potassium perchlorate, zirconium, silica as filler and stabilizer and a solution of Viton B (fluoroelastomer binder) in butyl acetate.
KDNBF potassium dinitrobenzofuroxanate
Zrconium zirconium
silica silica
Viton B fluoroelastomer binder
the organic solvent is amyl acetate, butyl acetate, propyl acetate, or isomers thereof.
Such suspension of explosive composition has suitable rheological properties because its individual components do not sediment and it is technologically processable for multiple applications to the electric pill skeleton formed by metal lamellas with the resistance wire forming a bridge, where after the drying operation forms the electric pill fuse head.
the listed formula of the suspension of explosive composition applied to the resistance wire of the electric pill then, after drying the organic solvent and providing the lacquer layer, ensures the required sensitivity of the electric pill to initiation when heating the resistance wire of varying material composition and diameter, and the formed fumes after its explosive transformation generate regular burst of flame and allow regular ignition of the pyrotechnic delay composition in the electric detonator.
the concerned composition of the fuse head of the electric pill is harmless from the point of view of ecology because it does not contain any non-ecological components and does not create such by its explosive transformation.
the explosive composition and its products after the explosive transformation are thus environmentally friendly.
the mentioned explosive composition can also be used as a separate electric pill or in an electric igniter assembly also for use in fireworks.
Fig. 1 shows a vertical front cross section of the electric pill
Fig. 2 shows a vertical side cross section of this pill.
the electric pill in Figs. 1 and 2 is formed by two metal lamellas 4 between which a resistance wire is arranged 3. Fixation of the lamellas 4 with the attached resistance wire 3 is made by a plastic clip 5 .
the suspension of explosive composition 2 is applied to the resistance wire 3, or to the skeleton formed by endings of the lamellas 4 with the resistance wire 3, according to this technical solution and using the dipping technology. After drying out and removal of organic solvents, the explosive composition is provided with lacquer layer 1, in this case a nitrocellulose lacquer ensuring the mechanical strength of the electric pill fuse head thus formed.
the suspension of the explosive composition 2 consists of 48 wt. portions of the potassium salt of dinitrobenzofuroxane, 25 wt. portions of potassium perchlorate, 9 wt. portions of zirconium, 9 wt. portions of boron, and 9 wt. portions of calcium silicide in a 1% solution of nitrocellulose in amyl acetate.
This suspension was applied by the dipping technology to a skeleton with a resistance wire 3 made of NiCr (80/20) alloy with a wire diameter of 30 micrometres, in which case the subsequently formed electric pill fuse head exhibited the parameters of safe current 0.18A and ignition current 1A.
the suspension of explosive composition 2 consists of 48 wt. portions of the potassium salt of dinitrobenzofuroxane, 25 wt. portions of potassium perchlorate, 9 wt. portions of zirconium, 9 wt. portions of boron and, 9 wt. portions of calcium silicide in a 3% solution of fluoroelastomer in butyl acetate.
This suspension was applied by the dipping technology to a skeleton with a resistance wire 3 made of NiCr (80/20) alloy with the wire diameter of 55 micrometres, in which case the subsequently formed electric pill fuse head exhibited the parameters of safe current 0.45A and ignition current 1.5A.
the suspension of explosive composition 2 consists of 55 wt. portions of the potassium salt of dinitrobenzofuroxane, 15 wt. portions of potassium perchlorate, 10 wt. portions of zirconium, 10 wt. portions of boron, and 10 wt. portions of calcium silicide in a 5% solution of nitrocellulose in amyl acetate.
This suspension was applied by the dipping technology to a skeleton with a resistance wire 3 made of NiCr (80/20) alloy with the wire diameter of 45 micrometres, in which case the subsequently formed electric pill fuse head exhibited the parameters of safe current 0.25A and ignition current 1.1A.
the suspension of explosive composition 2 consists of 40 wt. portions of the potassium salt of dinitrobenzofuroxane, 15 wt. portions of potassium perchlorate, 15 wt. portions of zirconium, 15 wt. portions of boron, and 15 wt. portions of calcium silicide in a 5% solution of nitrocellulose in amyl acetate.
This suspension was applied by the dipping technology to a skeleton with a resistance wire 3 made of NiCr (80/20) alloy with the wire diameter of 100 micrometres, in which case the subsequently formed electric pill fuse head exhibited the parameters of safe current 1.2A and ignition current 3.5A.
the suspension of explosive composition 2 consists of 55 wt. portions of the potassium salt of dinitrobenzofuroxane, 12 wt. portions of potassium perchlorate, 8 wt. portions of zirconium, 10 wt. portions of boron, and 15 wt. portions of calcium silicide in a 3% solution of nitrocellulose in butyl acetate.
This suspension was applied by the dipping technology to a skeleton with a resistance wire 3 made of CuNi (44% of Ni) alloy with the wire diameter of 170 micrometres, in which case the subsequently formed electric pill fuse head exhibited the parameters of safe current 4A and ignition current 25A.

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Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Engineering & Computer Science (AREA)
General Engineering & Computer Science (AREA)
Inorganic Chemistry (AREA)
Air Bags (AREA)
Dental Preparations (AREA)

EP22020161.0A 2021-04-12 2022-04-08 Suspension of explosive composition of pill fuse head for industrial electric detonators Active EP4140973B1 (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CZ2021-180A CZ2021180A3 (cs)	2021-04-12	2021-04-12	Suspenze třaskavé slože hlavičky pilule pro průmyslové elektrické rozbušky

Publications (2)

Publication Number	Publication Date
EP4140973A1 EP4140973A1 (en)	2023-03-01
EP4140973B1 true EP4140973B1 (en)	2024-02-28

Family

ID=83601205

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP22020161.0A Active EP4140973B1 (en)	2021-04-12	2022-04-08	Suspension of explosive composition of pill fuse head for industrial electric detonators

Country Status (3)

Country	Link
EP (1)	EP4140973B1 (cs)
CZ (1)	CZ2021180A3 (cs)
PL (1)	PL4140973T3 (cs)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CZ294317B6 (cs) *	2001-06-08	2004-11-10	Indet Safety Systems A. S.	Pyrotechnická směs pro elektrické iniciátory se sníženou toxicitou
FR2833693B1 (fr) *	2001-12-14	2004-03-12	Livbag Snc	Procede de realisation d'un initiateur electro-pyrotechnique par emploi d'une colle aqueuse
FR2861389B1 (fr) *	2003-10-22	2006-03-10	Davey Bickford	Composition pyrotechnique faiblement sensible a l'electricite statique et aux ultrasons.
US8784583B2 (en) *	2004-01-23	2014-07-22	Ra Brands, L.L.C.	Priming mixtures for small arms
CZ35228U1 (cs) *	2021-04-12	2021-07-13	Austin Detonator S.R.O.	Suspenze třaskavé slože hlavičky pilule pro průmyslové elektrické rozbušky

2021
- 2021-04-12 CZ CZ2021-180A patent/CZ2021180A3/cs unknown
2022
- 2022-04-08 EP EP22020161.0A patent/EP4140973B1/en active Active
- 2022-04-08 PL PL22020161.0T patent/PL4140973T3/pl unknown

Also Published As

Publication number	Publication date
PL4140973T3 (pl)	2024-05-06
CZ2021180A3 (cs)	2022-10-19
EP4140973A1 (en)	2023-03-01

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