US2635543A - Container for safety blasting explosives - Google Patents

Container for safety blasting explosives Download PDF

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Publication number
US2635543A
US2635543A US3756A US375648A US2635543A US 2635543 A US2635543 A US 2635543A US 3756 A US3756 A US 3756A US 375648 A US375648 A US 375648A US 2635543 A US2635543 A US 2635543A
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US
United States
Prior art keywords
paper
container
unwaxed
waxed
length
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
Application number
US3756A
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English (en)
Inventor
Sillitto George Percy
Ashcroft Donald George
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2635543A publication Critical patent/US2635543A/en
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
    • C06C5/00—Fuses, e.g. fuse cords
    • 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
    • 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
    • F42B3/28—Cartridge cases characterised by the material used, e.g. coatings

Definitions

  • the present invention relates to containers for Safety blasting explosivesand to the provision of safety-sheathed blasting explosive cartridges formed from safety blasting explosives in said containers.
  • safety-sheathed blasting explosive cartridges is meant a cartridge of a detonating explosive made from a composition including a suitable proportion of ingredients adapted to minimise its capacity for igniting fire-damp air mixtures or coal-dust air mixtures when it detonates and which is provided along its y,cylindrical surface with an external safety sheath that comprises -amequenching or cooling ingredients.
  • the explosive composition customarily includes ammonium nitrate as one of its power producing ingredients, one or more compounds capable of vapcrisation, fusion or thermal decomposition with absorption of heat as a flame quenching or cooling ingredient, and the safetysheath also comprises .one or more compound of the latter description. It is also the practice for theexplosive cartridge proper to be provided with a waterproofed paper wrapper and for this portion of the sheathed cartridge to comply with the official gallery tests for permitted explosives.
  • the blanketing eiect of carbon dioxide on the flame of the, explosive and its innocuous character render it a particularly desirable gas to be generated'by the sheathing material when the detonation takes place.
  • sheathing materials consisting essentially of various more or less insoluble metal carbonates have been tried with varying results.
  • sodium bicarbonate is 4the most effective and is the cornpound generally employed in practice in this country, notwithstanding the fact that it is slightly soluble in water and must be carefully separated by a waterproof wrapping from the explosive cartridge, since it would otherwise react with the ammonium salt present in the explosive, to produce ammonium bicarbonate which gives rise to loss of ammonia and carbon dioxide.
  • vBritish specification No. 416,586 discloses inter alia a flexible safety sheathing material for blasting explosives consisting of name quenching felt material in sheet form and comprising a uniform mixture of a fibrous binding-materiaranda vprcponderating -proportion of a cooling salt or mixtures of cooling salts.
  • the object of the present invention is to provide in a simple and convenient manner a .conftainer for a safety blasting explosive which shall embody in itself the three essentials required in the covering of a safety-sheathed blasting explosive cartridge, namely the water-proofed paper wrapper for the cartridge proper, the flame quenching felt material and the external unwaxed paper wrapping, thereby permittingsafety sheathed blasting explosives to be more advantageously manufactured.
  • a container for a safety blasting explosive consists internallyy of waxed paper and externally of unwaxed paper, the waxed and unwaxed papers being separated from one another by flame quenching felt vmaterial and Vis formed from va length of quenchingfelt material cemented at one end to a length o f unwaxed paper andat its other end to a length of waxed paper, wherein the width of the. felt material and unwaxed paper correr-l sponds substantially to the length of explosive charge to'beheld by the container and the width of the waxed.
  • the unwaxed paper is such that it projects at each side E,of the felt material to enable the endclosures of the container to be formed and wherein the lengths of the feltmaterialand waxed and unwaxedpapers are such as to permit the desired numbers of layers of each of these to be provided- If desired the unwaxed paper may be so cemented-to the ame quenching felt as to leave only a free narrow longitudinal strip of unwaxed paper sufficient to forma sealed cylinder.
  • the inside surface-"ofthe thus formed can be given acoating of waxby the spraying thereon of a melted wax composition.
  • the inventiontne method forfvhe production of safety-sheathed blasting explosive cartridges comprises introducing a charge f container .c 10 ternal surface of the cylinder, and folding Vone safety blasting explosive.. into a container con- 'I ssting internally of waxed paper and externally of unwaxed paper separated from one another by llame quenching felt material and formed from a length of flame quenching felt material cementedat one "end'to a length o funwaxedpaper and at the4 other end tol aL length ofl waxed paper whereinv the width of the felt material and unwaxed paper corresponds substantiallyjt'o the length of explosive charge tobe held by the ⁇ container and the width of the waxed paper issuch Athat it projects at each side of thefelt material to enable the end-'closures of the container to be formed and wherein the-lengths of the felt material and waxes and unwaxed papers are such as to permitthe desired number of layers of each of these
  • Figs. 1 and '2 Yis a plan view of a length of name quenching felt material cemented at one end to unwaxed paper and at its other end to waxed paper
  • Fig'. 3 is a longitudinal section through a cylinder formed by rolling the felt material-paper lengths shown ⁇ in Fig. 1 or Fig. 2, .andfFig 4'is a longitudinal section through a container formed'by folding one of the projections in the cylinder shown in Fig. 3.
  • I is a p iece of'ame quenching felt material 6% inches wi'de'and 12%;v incheslong and consistir'ig approximatelyof 85 per 'cent sodium bicarbonate and 15 per cent'wood pulp
  • 2 is a piece of waxed'manilla ⁇ paper, 8 1g inches long and 81/4 inches wide
  • 3 is apiece :of unwaxed paper6% inches wide'and 61A inches long.
  • the felt vvmaterial paper 'lengths' are' rolled-into cylinders of 11%; inches internal diameter in such a way that'the waxed paper 2 is first" formed' into cylindricalfshape'an'd that the felt material at 6 is in due 4course between 4waxed paper-surfaces.
  • a 4 nished container is formed as shown in Fig. 4.
  • the external diameter of the nished container as shown in Fig. 4 is approximately lfl inches.
  • This container has two layers of waxed paper 2, three vlayers of felt material I. and one llayer of unwaxed' paper 3. Into' ⁇ the finished container shown in Fig.
  • Polar Viking composition Home Oice Permitted List
  • Polar Viking is a nitroglycerine powder explosive suitable for use in coal mines in which fire -damp or coal dust may be present. If desired, the folded ends of the closed container can be given a spray-coatingof wax.
  • a safety blasting explosive charge container vconsisting internally of a length of waxed paper sheet and externally of a length of unwaxed paper sheet, the waxed and unwaxed paper sheets being separatedonerfrom the other by a name quenching felt sheet, said flame quenching felt sheet comprising a uniform mixture of a fibrous binding agent and a preponderating proportion of at least one powdered flame cooling compound, and having at one end the length of unwaxed paper sheet cemented across its width, and at its other end the length of waxed paper sheet cemented across its width, wherein the width of the sheet of flame quenching felt material and unwaxed paper correspond substantially to the length of ⁇ the explosiveV charge to be held by the container and the Width of the waxed paper is such that it projects at each side of the felt material and thereby provides end-closure means, and wherein the joined lengths of the felt material, waxed, and Vunwaxed sheets which comprise the connes of the said'con
  • a method for the production of a container for a safety blasting explosive which comprises fashioning into 'a cylinder a length of flame quenching felt material cemented at one end to a length of waxed paper having a width'such that it projects at each side ofthe felt material and cemented at its other end to a length of unwaxed paper substantiallyfthe same width so that the waxed paper forms the internal surface of the cylinder and the unwaxed paper forms the external surface of the cylinder, and folding one end of the projecting waxed paper.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
US3756A 1947-02-04 1948-01-22 Container for safety blasting explosives Expired - Lifetime US2635543A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3274/47A GB620950A (en) 1947-02-04 1947-02-04 Improvements in or relating to containers for safety blasting explosives

Publications (1)

Publication Number Publication Date
US2635543A true US2635543A (en) 1953-04-21

Family

ID=9755236

Family Applications (1)

Application Number Title Priority Date Filing Date
US3756A Expired - Lifetime US2635543A (en) 1947-02-04 1948-01-22 Container for safety blasting explosives

Country Status (6)

Country Link
US (1) US2635543A (en])
BE (1) BE480096A (en])
DE (1) DE842314C (en])
FR (1) FR960418A (en])
GB (1) GB620950A (en])
LU (1) LU28914A1 (en])

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884380A (en) * 1956-08-23 1959-04-28 Carey Philip Mfg Co Thermal insulation material and method of making the same
US3437016A (en) * 1966-04-05 1969-04-08 Chevron Res High-strength container and container blanks having seamless bottom walls and method of forming same
US4537133A (en) * 1983-03-31 1985-08-27 The United States Of America As Represented By The Secretary Of The Interior Non-incendive rock-breaking explosive charge
US5201461A (en) * 1991-07-05 1993-04-13 Field Container Co., L.P. Composite flat blank for containers and method
US5333779A (en) * 1993-02-17 1994-08-02 Field Container Company, L.P. Flat blank for containers and method case II
US20090000504A1 (en) * 2005-12-12 2009-01-01 Ernest Frieden Multifunctional Detonation System

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1074926A (en) * 1912-07-11 1913-10-07 Charles S Bird Paper tube and method of making the same.
GB416586A (en) * 1933-03-14 1934-09-14 James Sinton Bruce Fleming Improvements in and relating to the manufacture of safety explosives
GB501119A (en) * 1937-09-22 1939-02-21 Arendonck Sa D Safety cartridge for mines
GB511843A (en) * 1938-01-24 1939-08-25 John Edward Hackford Improvements in the manufacture of containers
US2347236A (en) * 1941-05-05 1944-04-25 Dixie Cup Co Container

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1074926A (en) * 1912-07-11 1913-10-07 Charles S Bird Paper tube and method of making the same.
GB416586A (en) * 1933-03-14 1934-09-14 James Sinton Bruce Fleming Improvements in and relating to the manufacture of safety explosives
GB501119A (en) * 1937-09-22 1939-02-21 Arendonck Sa D Safety cartridge for mines
GB511843A (en) * 1938-01-24 1939-08-25 John Edward Hackford Improvements in the manufacture of containers
US2347236A (en) * 1941-05-05 1944-04-25 Dixie Cup Co Container

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884380A (en) * 1956-08-23 1959-04-28 Carey Philip Mfg Co Thermal insulation material and method of making the same
US3437016A (en) * 1966-04-05 1969-04-08 Chevron Res High-strength container and container blanks having seamless bottom walls and method of forming same
US4537133A (en) * 1983-03-31 1985-08-27 The United States Of America As Represented By The Secretary Of The Interior Non-incendive rock-breaking explosive charge
US5201461A (en) * 1991-07-05 1993-04-13 Field Container Co., L.P. Composite flat blank for containers and method
US5333779A (en) * 1993-02-17 1994-08-02 Field Container Company, L.P. Flat blank for containers and method case II
US20090000504A1 (en) * 2005-12-12 2009-01-01 Ernest Frieden Multifunctional Detonation System
US8146500B2 (en) * 2005-12-12 2012-04-03 Recconn Ag Multifunctional detonation system

Also Published As

Publication number Publication date
FR960418A (en]) 1950-04-18
LU28914A1 (en])
BE480096A (en])
DE842314C (de) 1952-06-26
GB620950A (en) 1949-04-01

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