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US3727512A - Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases - Google Patents

Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases Download PDF

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Publication number
US3727512A
US3727512A US00016366A US3727512DA US3727512A US 3727512 A US3727512 A US 3727512A US 00016366 A US00016366 A US 00016366A US 3727512D A US3727512D A US 3727512DA US 3727512 A US3727512 A US 3727512A
Authority
US
United States
Prior art keywords
porous
film
barrier layer
cases
process according
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
US00016366A
Other languages
English (en)
Inventor
C Berger
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.)
Les Forges de Zeebrugge SA
Original Assignee
Les Forges de Zeebrugge SA
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 Les Forges de Zeebrugge SA filed Critical Les Forges de Zeebrugge SA
Application granted granted Critical
Publication of US3727512A publication Critical patent/US3727512A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/18—Caseless ammunition; Cartridges having combustible cases
    • F42B5/192—Cartridge cases characterised by the material of the casing wall
    • F42B5/196—Coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/70—Combustilbe cartridge

Definitions

  • the invention relates to a process for surface treating [5 l Int. Cl ..F42b 5/18 porous combustible Cartridge cases Said process [58] Field of Search ..102/38, 43, DlG. l,
  • cartridge is used herein to describe receptacles used in the ammunition techniques for explosive propellent charges, it being possible to give to said receptacles, shapes adapted to the weapons or their intended purposes, used in connection with the projectile proper or separated therefrom.
  • Such non metallic cartridges provided to burn with the propellent charge provide a problem in that the desired porous structure of the constituting material of the cartridge must have excellent break strength and storage stability. This is obtained by using synthetic materials or by solidfying combustible paper or cellulose raw materials. However, most pores are then closed, thereby slowing down the combustion process.
  • An additional drawback results from the fact that the synthetic materials, i.e., the pasting products, are preventing a complete combustion of the constituting material of the cartridge, thereby causing detrimental effects through the barrel and a diminution of the initial velocity.
  • the coating of the combustible cartridges with a protective lacquer layer against moisture action is detrimental in that said layer penetrates the constituting material of the cartridge to such a depth that the above drawbacks resulting from the manufacture method, namely the combustion slowing down, are still remaining.
  • this invention comprises substantially coating the cases made of porous combustible materials and more particularly the external surfaces thereof with a film of natural or synthetic swelling polymers or derivatives of such polymers, said film forming a barrier layer and, when said layer is set, coating it with a protective layer stable to moisture.
  • the barrier layer is obtained by affixing a water swelling cellulose film.
  • the barrier layer may be also made of synthetic or natural polymers or derivatives thereof having a structure chemically similar to that of cellulose, e.g., polyvinyl alcohol and esters and ethers thereof.
  • swelling means for forming the barrier layer not only water, but also other gel-forming or dissolving liquids may be used according to this invention.
  • the barrier layer consisting preferably of water swelling cellulose or cellulose derivatives may be applied in high viscosity solution in a single operation or also in a low viscosity film. After drying of the first coating, the barrier layer is then made non porous by a second film.
  • the surface layer is applied as a protective layer above the barrier layer consists of a film forming rubber solution admixed with small amounts of bitumen and/0r paraffin.
  • porous receptacles of cellulose derivatives formed as known in accordance with the intended purpose, may be used.
  • porous receptacle which may also consist of nitrated fibers, is advantageous in that it has an external surface protected by a barrier layer consisting of a non porous film covering only the external surface and having consequently no effect upon the porosity.
  • the external protective layer prevents the non metallic case from being damaged by any action of air humidity, water vapour or sea water.
  • Cartridges according to the invention have shown such a moisture resistance that after several hours in water at 20 C or after an extended storage under a relative humidity of percent, the ballistic requirements have been compltely fulfilled on test firings without observing any slowing down or detrimental effect upon the weapon.
  • porous materials there may be used also non combustible materials which, when exploding, are leaving no residue and are not damaging the weapon by corrosion or erosion.
  • the attached drawing shows by way of example a partial section of a case embodiment.
  • Reference number 10 indicates the porous combustible material forming a cartridge of corresponding sizes, e.g., a fuse case, a mine body or the like.
  • the external surface of the porous body 10 is covered with the non porous barrier layer 11 in such manner that the barrier layer 11 forms a closed surface film.
  • the protective layer 12 according to the invention is then applied on the barrier layer.
  • the barrier layer and the external protective layer may be made in any known manner, e.g., by spreading or dipping.
  • a process for the surface treatment of articles comprising 1. providing a porous combustible article,
  • barrier layer is applied as a low viscosity film to which, after drying, is applied a second film eliminating the pores.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Package Frames And Binding Bands (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
US00016366A 1969-03-13 1970-03-04 Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases Expired - Lifetime US3727512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1912727A DE1912727C3 (de) 1969-03-13 1969-03-13 Verfahren zur Oberflachenbehandlung von aus brennbaren Werkstoffen bestehenden Munitionshulsen und hiernach hergestellte Munitionshülsen bzw. Kartuschen

Publications (1)

Publication Number Publication Date
US3727512A true US3727512A (en) 1973-04-17

Family

ID=5727979

Family Applications (1)

Application Number Title Priority Date Filing Date
US00016366A Expired - Lifetime US3727512A (en) 1969-03-13 1970-03-04 Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases

Country Status (17)

Country Link
US (1) US3727512A (xx)
JP (1) JPS4835319B1 (xx)
AT (1) AT307277B (xx)
BE (1) BE746766A (xx)
CA (1) CA974416A (xx)
CH (1) CH526088A (xx)
DE (1) DE1912727C3 (xx)
DK (1) DK135523B (xx)
ES (2) ES377367A1 (xx)
FI (1) FI52002C (xx)
FR (1) FR2037692A5 (xx)
GB (1) GB1291391A (xx)
IL (1) IL34008A (xx)
LU (1) LU60510A1 (xx)
NL (1) NL150694B (xx)
NO (1) NO129367B (xx)
SE (1) SE368084B (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877374A (en) * 1973-07-12 1975-04-15 Olin Corp Protective coating for caseless ammunition
US3987731A (en) * 1976-01-16 1976-10-26 The United States Of America As Represented By The Secretary Of The Army Composite protective coating for combustible cartridge cases
US4363273A (en) * 1977-03-10 1982-12-14 Rheinmetall Gmbh Ammunition with protective surface layer and method of making same
US5052304A (en) * 1989-07-28 1991-10-01 Rheinmetall Gmbh Propelling charge container
US5237927A (en) * 1991-10-21 1993-08-24 Olin Corporation Energetic consumable cartridge case
EP1426727A1 (de) * 2002-12-05 2004-06-09 Rheinmetall W & M GmbH Treibladungsbehälter
WO2017171692A3 (en) * 2015-05-28 2018-02-15 Olive Tree Financial Group, L.L.C. Projectile

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2451462A1 (de) * 1974-10-30 1976-05-06 Maschf Augsburg Nuernberg Ag Einspritzventil fuer hubkolbenbrennkraftmaschinen
US4149506A (en) * 1975-10-29 1979-04-17 Cummins Engine Company, Inc. Fuel injector
DE3418762A1 (de) * 1984-05-19 1985-11-21 Robert Bosch Gmbh, 7000 Stuttgart Einspritzventil
DE3418761A1 (de) * 1984-05-19 1985-11-21 Robert Bosch Gmbh, 7000 Stuttgart Einspritzventil
DE3624476A1 (de) * 1986-07-19 1988-01-28 Bosch Gmbh Robert Einspritzventil
DE3624477A1 (de) * 1986-07-19 1988-01-28 Bosch Gmbh Robert Einspritzventil

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1661278A (en) * 1928-03-06 Bernhart troxler
US2783138A (en) * 1944-04-11 1957-02-26 Aerojet General Co Propellant compositions
US2940390A (en) * 1956-01-11 1960-06-14 Bofors Ab Explosive ammunition and a method of manufacturing the same
US3012507A (en) * 1961-12-12 Shaped- ammonium nitrate propellant
US3046829A (en) * 1959-06-22 1962-07-31 Olin Mathieson Composite propellent grains
US3063373A (en) * 1959-06-08 1962-11-13 Hercules Powder Co Ltd Method of blasting
US3157127A (en) * 1962-03-15 1964-11-17 Standard Oil Co Solid propellant grain with cellulose acetate coating
US3264993A (en) * 1965-04-22 1966-08-09 Atlantic Res Corp Combustible cartridge case composition and process
US3279372A (en) * 1964-06-04 1966-10-18 Ici Ltd Seismic detonator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1661278A (en) * 1928-03-06 Bernhart troxler
US3012507A (en) * 1961-12-12 Shaped- ammonium nitrate propellant
US2783138A (en) * 1944-04-11 1957-02-26 Aerojet General Co Propellant compositions
US2940390A (en) * 1956-01-11 1960-06-14 Bofors Ab Explosive ammunition and a method of manufacturing the same
US3063373A (en) * 1959-06-08 1962-11-13 Hercules Powder Co Ltd Method of blasting
US3046829A (en) * 1959-06-22 1962-07-31 Olin Mathieson Composite propellent grains
US3157127A (en) * 1962-03-15 1964-11-17 Standard Oil Co Solid propellant grain with cellulose acetate coating
US3279372A (en) * 1964-06-04 1966-10-18 Ici Ltd Seismic detonator
US3264993A (en) * 1965-04-22 1966-08-09 Atlantic Res Corp Combustible cartridge case composition and process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877374A (en) * 1973-07-12 1975-04-15 Olin Corp Protective coating for caseless ammunition
US3987731A (en) * 1976-01-16 1976-10-26 The United States Of America As Represented By The Secretary Of The Army Composite protective coating for combustible cartridge cases
US4363273A (en) * 1977-03-10 1982-12-14 Rheinmetall Gmbh Ammunition with protective surface layer and method of making same
US4452653A (en) * 1977-03-10 1984-06-05 Rheinmetall Gmbh Method of coating ammunition with a protective surface layer
US5052304A (en) * 1989-07-28 1991-10-01 Rheinmetall Gmbh Propelling charge container
US5237927A (en) * 1991-10-21 1993-08-24 Olin Corporation Energetic consumable cartridge case
EP1426727A1 (de) * 2002-12-05 2004-06-09 Rheinmetall W & M GmbH Treibladungsbehälter
WO2017171692A3 (en) * 2015-05-28 2018-02-15 Olive Tree Financial Group, L.L.C. Projectile

Also Published As

Publication number Publication date
CH526088A (fr) 1972-07-31
CA974416A (en) 1975-09-16
LU60510A1 (xx) 1970-05-11
FI52002C (fi) 1977-05-10
ES159600U (es) 1970-10-16
DK135523B (da) 1977-05-16
SE368084B (xx) 1974-06-17
FI52002B (xx) 1977-01-31
ES159600Y (es) 1971-03-16
BE746766A (fr) 1970-09-03
ES377367A1 (es) 1972-06-16
DE1912727A1 (de) 1970-10-01
GB1291391A (en) 1972-10-04
NO129367B (xx) 1974-04-01
DE1912727C3 (de) 1980-02-07
AT307277B (de) 1973-05-10
NL150694B (nl) 1976-09-15
IL34008A (en) 1974-03-14
JPS4835319B1 (xx) 1973-10-26
DE1912727B2 (de) 1979-05-23
DK135523C (xx) 1977-10-24
IL34008A0 (en) 1970-11-30
FR2037692A5 (xx) 1970-12-31
NL7003089A (xx) 1970-09-15

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