Improvements in the Waterproofing of Blasting Cartridges and New Waterproofing Compounds suitable therefor.
Year: 1897

page_text: Date of Application, 21st Oct., 1897
Complete Specification Left, 18th July, 1898-Accepted, 20th Aug.,
1898
Improvements in the Waterproofing of Blasting Cartridges and
New Waterproofing Compounds suitable therefor.
I, GEORGE BENEKE, of 13, Hesketh Street, Southport, in the County of Lancaster,
Gentleman, do hereby declare the nature of this invention to be as follows:-
This invention relates to a new waterproofing compound and its manufacture for
the coating of blasting cartridges principally used in coal mines, whereby the
paper and cartridge covering will not ignite when such cartridges are exploded.
Hitherto in the waterproofing of blasting cartridges, paper, wood pulp, and other
cartridge cases have been coated with various compounds such as ozokerit,
wax, paraffin, pitch, resin, asphalt, &c., all of which being of a highly inflam-
mable nature have rendered the use of safety mining explosives extremely
dangerous, causing the cartridge cases to burn and igniting mixtures of pit gas
and coal dust. Others have used lead, tin and other metallic cartridge cases to
prevent ignition though such material adds very considerably to the cost of the
explosives.
I have discovered that better effects and safety may be produced by incorporating
into the waterproof mixtures hitherto used and preferably also into the cartridge
paper, a proportion of carbonate or bi-carbonate of sodium or potassium. In place of
the carbonates may be employed borates or bi-borates, tungstates, alum or other
mineral salts of a flame reducing nature.
Having stated the nature of my invention I will further illustrate it by giving
an example of the numerous mixtures which may be made, but I premise that the
details may be varied without departing from my invention.
In order to carry out my invention I heat 50 parts of resin and 50 parts of pitch
and when melted and in a fluid state I stir into it 20 to 40 parts of sodium car-
bonate or bi-carbonate or other flame reducing salt. I then add 5 to 10 parts of
beeswax and 5 to 10 parts of linseed oil. I continue to heat the mixture and when
still in a fluid state I dip the cartridges or packages of explosives into it. The
cartridges or packages are then allowed to cool and dry. By preference, the paper
used for cartridging should also contain a proportion of the mineral salts.
Dated this 21st day of October 1897.
Improvements in the Waterproofing of Blasting Cartridges and
New Waterproofing Compounds suitable therefor.
I, GEORGE BENEKE, of 13, Hesketh Street, Southport, in the County of Lancaster,
Gentleman, do hereby declare the nature of this invention and in what manner the
DR17

page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement:-
"
This invention relates to a new waterproofing compound and its manufacture for
the coating of blasting cartridges principally used in coal mines, whereby the
paper and cartridge covering will not ignite when such cartridges are exploded.
Hitherto in the waterproofing of blasting cartridges, paper, wood pulp, and other
cartridge cases have been coated with various compounds such as ozokerit, ceresine,
wax, paraffin, pitch, resin, asphalt, &c., &c., all of which being of a highly inflam-
mable nature have rendered the use of safety mining explosives extremely
dangerous, causing the cartridge cases to burn and igniting mixtures of pit gas
and coal dust. Others have used lead, tin and other metallic cartridge cases to
prevent ignition though such material adds very considerably to the cost of the
explosives.
I have discovered that better effects and safety may be produced by incorporating
into the waterproof mixture hitherto used and preferably also into the cartridge
paper, a proportion of carbonate or bi-carbonate of sodium or potassium. In place of
the carbonates may be employed borates or bi-borates, tungstates alum or other
mineral salts of a flame reducing nature.
Having stated the nature of my invention I will further illustrate it by giving
an example of the numerous mixtures which may be made, but I premise that the
details may be varied without departing from my invention.
In order to carry out my invention I heat 50 parts of resin and 50 parts of pitch
and when melted and in a fluid state I stir into the mixture 20 to 40 parts of sodium
carbonate or bi-carbonate, or other flame reducing salt. I then add 5 to 10 parts of
beeswax or mineral wax and 5 to 10 parts of linseed oil. I continue to heat the mixture
and when still in a fluid state I dip the cartridges or packages of explosives into it.
The cartridges or packages are then allowed to cool and dry. By preference, the paper
used for cartridging should also contain a proportion of the mineral salts.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is-
1. The method or process of treating blasting cartridges which are enclosed in a
casing of combustible material in order to render said casing waterproof and to
prevent ignition of the same on explosion, which method consists in coating the
casing with waterproofing material containing a proportion of a flame reducing
salt or salts such for example as carbonate or bicarbonate of soda or potassium, the
casing being previously impregnated or not with a flame reducing salt or salts,
substantially as described.
2. A waterproofing compound for coating the cases of blasting cartridges, such
compound consisting of waterproofing material and one or more flame reducing
salts incorporated therewith as set forth.
3. A waterproofing compound for coating the cases of blasting cartridges such
compound consisting of resin, pitch, sodium, carbonate or bicarbonate or other
flame reducing salt, wax and linseed oil as set forth.
1012
1
TI
1000
J. C. MEWBURN & ELLIS,
55, and 56, Chancery Lane, London, Chartered Patent Agents.