US3430532A - Means for making pellets,particularly explosive pellets - Google Patents

Means for making pellets,particularly explosive pellets Download PDF

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Publication number
US3430532A
US3430532A US653136A US3430532DA US3430532A US 3430532 A US3430532 A US 3430532A US 653136 A US653136 A US 653136A US 3430532D A US3430532D A US 3430532DA US 3430532 A US3430532 A US 3430532A
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United States
Prior art keywords
pellets
formers
die
slug
slurry
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Expired - Lifetime
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US653136A
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English (en)
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Jean K Campbell
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Emhart Enterprises Corp
USM Corp
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USM Corp
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    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0017—Deairing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
    • B30B9/042—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with casings mounted on a movable carrier, e.g. turntable
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0041—Shaping the mixture by compression
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0066—Shaping the mixture by granulation, e.g. flaking

Definitions

  • This invention relates to mechanism and a method for accurately producing fibrous articles with uniform shape and weight, and by way of illustration is particularly directed to precision forming of explosive pellets, for instance those of the cartridgeless, fibrous nitrocellulose type disclosed in a copending application Ser. No. 524,- 168, filed Feb. 1, 1966 in the name of Robert C. Kvavle, now issued as United States Patent No. 3,372,643.
  • Sensitivity of the explosive material to molding pressure and to heat is Widely known, as is the danger inherent in a production system conducive to a working atmosphere wherein dust of the material may exist.
  • fluid has hitherto been employed as a medium for the fibrous material, which by itself quickly mats and resists flow, it has been customary, and indeed considered invariably essential, to provide an aqueous substance or emulsion with a resin binder, a plasticizer, or a casting solvent.
  • the simpler technique herein disclosed not only overcomes problems previously encountered but insures reliably consistent energy levels in the output which are essential to power graded propellants.
  • a general object of the invention is the provision of an efficient and safe process and apparatus for manufacturing fibrous articles with precision in weight and form.
  • a more specific object is to provide such a method and means advantageous in the commercial production of explosive nitrocellulose pellets nited States Patent 0 which are reliably uniform in character and hence in potential energy.
  • the present invention features in this instance a slurry consisting solely of water and fibrous nitrocellulose in a ratio on an order ranging from 5:1 to about 12:1, and a stabilizer such as diphenyl amine, the slurry being continuously delivered to apparatus including vented pockets in the form of die cavities wherein excesses of fluid and fibre beyond what is desired are eliminated systematically in sequential steps to produce homogeneous, uniformly shaped and sized charges.
  • each die cavity is connected to a source of reduced air pressure, the venting holes also being used to withdraw and exhaust excess moisture from the slugs subsequent to loading the cavities and prior to forming by cooperation of a pair of upper and lower forming punches working in each die cavity.
  • the purging by suction of the cavity as it is loaded and the fact that the fibres retained are thus caused to do their own filtering are recirculated so that there is no wastage of materials, solid or liquid.
  • the fibrous materials entrapped as indicated is subjected to vacuum drying beyond the cavity loading zone, air being drawn through the slugs, and next undergoes a novel series of sizing and shaping operations effected by cams controlling relative forming movements of the forming punches with respect to one another, and with respect to the mentioned vents, and a unique material cut-off mechanism.
  • the latter as herein shown is arranged to operate at a work station following the cavity loading zone and preceding the work forming stations.
  • the lower forming punch is raised to an accurately adjustable, predetermined distance from the top of the die cavity thus to close the vacuum exhaust vents and cause projection of an unwanted portion of the moist fibrous slug material into the severance area of a fluid cut-off jet, preferably of water, the jet and the slug relatively moving to define a precise cutting line.
  • a fluid cut-off jet preferably of water
  • the upper punch cooperates in the die cavity with the lower punch progressively to form an exact remaining mass of the explosive fibers into the precise shape and density desired.
  • the upper punch is retracted from its die cavity, and the cooperating lower punch urges the formed fibrous article out of the cavity whereupon fluid pressure, preferably both air and water, ejects the article from the machine.
  • fluid pressure preferably both air and water
  • the emptied cavity may now recirculate through the loading zone.
  • FIG. 1 is a view in front elevation of a rotary press type pelleting machine for producing explosive pellets of fibrous nitrocellulose according to my novel method
  • FIG. 2 is a vertical section of the machine shown in FIG. 1, and taken along the line IIII therein;
  • FIG. 3 is a perspective view of an upper portion of the forming head of the machine, covers and guards being removed to reveal working structure such as a fluid jet trimming and a loading head;
  • FIG. 4 is a section, somewhat schematic, showing a die cavity being loaded beneath the head shown in FIG. 3;
  • FIG. 5 is a section, also somewhat schematic, showing the fluid jet trimmer of FIG. 3 and associated exhaust mechanism;
  • FIG. 6 is an axial section showing a pair of formers at one stage of compacting a slug
  • FIG. 7 is a perspective view of a pellet formed in the machine
  • FIG. 8 is a linear projection showing relative heightwise positions of the upper and lower formers throughout a cycle of operation as reflected by operating cams indicated;
  • FIG. 9 is a schematic view corresponding to FIG. 8, and indicating the sequence of functions in each cycle;
  • FIG. 10 is a plan view of cams controlling the lower formers.
  • FIG. 11 is a horizontal section, with portions broken away, showing some of the dies in relation to loading, trimming, and pellet ejecting means.
  • the illustrative machine comprises a fixed cast frame having a lower base portion 10 and an integral upper bearing column 12.
  • This column carries a rotary forming head 14 supported on a thrust bearing 16 (FIG. 2).
  • the head 14 for receiving and segregating particulate material in the form of fibres, in this instance nitrocellulose circulated in a slurry consisting only of water and a stabilizer, the head 14 in this instance is formed with cylindrical bores 17 (FIGS. 4-6) respectively disposed to receive a plurality of circularly arranged, equispaced tubular dies 18; a total of 24 dies being used in the exemplary machine.
  • the segregated fibrous material is to be partly dried, made uniform as to volume, and then progressively compressed into discrete, precise shapes, in this instance low explosive pellets P as shown in FIGS. 7 and 9. Accordingly 24 pellets per complete cycle of the head 14 are produced.
  • the respective dies 18 in the course of their revolution receive in their cylindrical cavities 19 (FIGS. 3-6) cooperative, vertically alined, upper and lower formers 20, 22, respectively, important distinctions in structure and method being hereinafter noted.
  • a variable speed motor-reducer 24 (FIGS. 1 and 2) is connected by an endless belt 26 to a pulley 28 (FIG. 2) on one end of a cross shaft 30 the other end of which drives meshing bevel gears 31, 32 (FIG. 1).
  • the gear 32 is rotatably connected to the head 14 by means including a stub shaft 34, and a pinion 36 thereon meshing with a ring gear 38 affixed to the head.
  • an upper pressure roll 40 (at the zero degree position in the diagram of FIG. 8 and in FIG. 9) and a cam 42 having a circular cam track formed to receive followers 44 on the respective upper ends of the formers 20.
  • the lower formers 22 are respectively provided at their lower ends with followers 46 (FIG- 2) arranged to cooperate in succession for purposes later to be explained, with a circular series of cams, namely, a lower pressure roll 48 (FIGS. 1 and 2) cooperative with the roll 40 for effecting maximum compression of the pellets P, a pellet eject jam 50 (FIG. 10), a former retract cam 52, a holddown cam 53, a cut-off adjust cam 54, and a preeompression cam 56.
  • the lower roll 48 is floatingly carried by linkage including a lever 64 (FIGS. 1 and 2) one end of which is pivoted to the frame 10 and the other end of which is pivotally connected to a link 66 (FIG. 1).
  • the latter is itself carried by a lever 68 one end of which is pivoted to the frame 10 at 70, and the other end of which is yieldingly supported on a plunger 72 urged upwardly by resilient means such as a compression spring 74 (or an air actuated diaphragm is preferred) carried in a cylindrical housing 76 secured at its lower end to the frame 10.
  • the plunger threadedly carries a hand wheel 78 by means of which the plunger can be moved accurately heightwise, and hence the degree of resistance to final compression of a pellet by the roll 48 selectively adjusted to determine pellet density.
  • the slurry is preferably constantly stirred in a storage vat and continuously recirculated in a supply and return system including a delivery pipe 82 (FIGS. 1-3) connected to a feed head 84 over-lying the loading portion of a fiat table 86 (FIGS. 2, 3, 9) constituting an annular portion of the head 14.
  • the tops of the dies 18 preferably are secured even with the surface of the table 86 as by means of die locks 88 (FIGS. 3 and 11) respectively inserted radially in the table 86.
  • pumping means not herein shown in detail, is provided for maintaining the circulation of slurry under an adjustable, selected pressure.
  • the feed head 84 is formed with a cavity 90 (FIGS.
  • the feed head 84 also has communicating with it an outlet pipe 92 for returning unused slurry to be recirculated.
  • the upper formers 20 are retracted out of the dies to positions above the feed head 84, and the lower formers 22 are caused to descend in the loading cavities to a level determined by the retracting cam 52.
  • the formers 20, 22 preferably have a stem diameter, adjacent to their respective forming ends, which is just enough smaller than that of the cavities 19 to afford a radial clearance allowing the passage of excess water to be exuded yet tending to obstruct the passage of solid materials such as nitrocellulose fibres.
  • the fibres are accumulated in the form of a wet slug S (FIG.
  • a suction means in the form of an evacuable chamber or conduit 94 (FIGS. 1-3, 11) communicating with the cavities 19 being loaded.
  • a suction means in the form of an evacuable chamber or conduit 94 (FIGS. 1-3, 11) communicating with the cavities 19 being loaded.
  • a right-hand section of the chamber 94 as shown in FIGS. 3 and 11 also communicates with at least one previously fully loaded cavity 19.
  • the cavities 19 are not reliably loaded to the level required; moreover, the cavities 19 preferably communicate with the conduit 94 through radial table vents 96 and a plurality of radial die bores 98 (FIGS. 4 and 5) of a reduced diameter on the order of .040" for passing water and obstructing the fibres to facilitate their matting and slug build-up.
  • the die bores 98 are inclined downward toward the die cavity 19 thus affording a longer slug S than when, alternatively, horizontal or upwardly inclined die bores 98 are employed as illustrated in FIG. 6.
  • outer ends of the vents 96 extend into a circular groove 100 in the table 86, the conduit 94 having spaced sealing means engaging the groove for maintaining effective exhaust condition.
  • the conduit 94 has exhaust outlets 104, 104 which are in communication with a manifold 106 (FIG. 2) secured to the frame portion 60.
  • each successive die 18 On emerging from the feed head 84 the successive dies 18 will have been loaded with wet fibres matted to form the slugs S (FIGS. 5, 9) bottomed on the lower former 22 and having a rough irregular upper surface. It is in this condition that the exhaust conduit 94- performs its final drying treatment.
  • the slugs next progress through a cut-off station generally designated 108 (FIGS. 1, 3, 5, 9, 11) where each successive lower former is caused by the cam 54 to move upwardly to block the vents 98 and then project the irregular unwanted upper portion of the slug above the table 86 and into the operating path of slug trimming means now to be described, thus leaving an exact predetermined mass of pellet material to be formed.
  • the slug trimming means preferably comprises a block 110 having a passage 112 for supplying water under pressure in a continuous fine jet from an orifice 114 (FIG. 5) arranged to emit its jet in a cutting path substantially parallel to the upper surface of the table 86.
  • No mechanical trimming or wiping means appears to safely or precisely excise the surplus nitrocellulose in the effective manner of the jet.
  • the feeding head 84 and the block 110 are mounted on the conduit 94, and the latter is secured on a support plate 116 secured to the base 10.
  • an exhaust passageway 118 in the block 110 communicates with the manifold 106. All recirculated fluid may pass through a precipitating zone (not shown) wherein waste nitrocellulose is recaptured for reuse.
  • both upper and lower formers 20, 22 descend in their dies 18, and then, while the bores 98 remain blocked by the formers 22, commence relative vertical movement together as they pass through a precompression zone as shown in FIGS. 6, 8 to effect gradual compression and forming of the slug.
  • the forming punches are in this instance preferably provided with web forming annular projections 120, respectively, to produce a symmetric pellet P (FIG.
  • the upper formers 20 are reelevated to out-of-the-way positions above the dies 18, and the lower formers 22 are successively raised by the eject cam 50 to thrust the formed pellets P axially from the cavities 19.
  • the formers 22 are retraced within the die cavities 19 by the cam 52 to reopen the radial bores 98 thus to enable air under pressure to be admitted thereto from a tube 126 (FIG. 11) having communication with groove and the bore 96.
  • This scavenging air blast lifts the ejected pellet, which is still slightly soft but stable enough to be handled, from the mouth of the die bore sufficiently to be carried by a water jet from a supply pipe 128 directly into an exit tube 130.
  • the latter is normally inclined downwardly and away from the apparatus to deliver the pellets P into a wire mesh container, for example, or onto a suitable conveyor (not shown) Where the carrying water is collected and recirculated.
  • the cycle is now completed and the dies 18 are ready to start once again through the loading zone 80.
  • Apparatus for continuously making articles of predetermined shape from fibrous material comprising:
  • exhaust means effectively connected radially to said dies for complete rapid filling of the die cavities in said zone with slurry by purging fluid slurry therefrom, the locality of the die and exhaust connection being disposed to be substantially interrupted by advancement of said one former,
  • (g) means for relatively moving the table and the cam means cyclically to operate the formers.
  • a machine as set forth in claim 2 wherein means is provided for conveying the dies in succession along a path for cooperation with the suction means and the slug trimming means.
  • Apparatus for making explosive charges including fibrous nitrocellulose of uniform size and weight comprising a plurality of dies each formed with a bore, means for supporting said dies in spaced arrangement with the axes of their bores parallel, a plurality of pairs of cooperative formers respectively operable along said axes of the die bores, cam means for moving the formers axially of their respective bores, mechanism for relatively moving said die supporting means and the cam means sequentially to control the relative axial movement of the successive pairs of formers, a fluid recirculating system for delivering to a loading zone of the die supporting means including at least one of the dies a slurry wherein nitrocellulosic fibers are entrained, exhaust means communicating with the bores of successive dies in said loading zone, said exhaust means being adapted to accumulate the slurry fibers in a die bore to provide a slug on one of the formers and partly eliminate fluid from the slug, and fluid jet means mounted external to the loading zone for trimming successive slugs a predetermined
  • a die having a bore, a reciprocable former operable in the bore and having substantially the same diameter, as said bore, loading means including an exhaust vent communicating with the bore to accumulate and segregate from a slurry introduced therein the fibres of nitrocellulose to be molded, a nozzle mounted for directing a liquid jet under pressure transversely of one end of the bore, and power actuated means sequentially controlling the movement of the former to cause it to move a slug of the segregated wet fibres into predetermined posi tion to be trimmed by the jet, then gradually to apply compacting pressure up to a predetermined maximum to the trimmed slug to be molded in the die, and finally to eject from the die a moist pellet of selected density formed from the compacted slug.
  • cam means for controlling the axial movement of said formers sequentially in the course of relative normal movement of the table in said plane
  • feed means for gravity loading successive die bores with a watery slurry of fibrous nitrocellulose
  • purging exhaust means communicating radially with the successive bores being loaded for rapidly and completely filling them with slurry initially and then partially solidifying therein slugs having at least a predetermined volume of the fibrous nitrocellulose
  • Apparatus as set forth in claim 13 wherein means is provided for collecting for reuse slurry from the purging exhaust means and the waste portions removed from the slugs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Medicinal Preparation (AREA)
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  • Medical Preparation Storing Or Oral Administration Devices (AREA)
US653136A 1967-07-13 1967-07-13 Means for making pellets,particularly explosive pellets Expired - Lifetime US3430532A (en)

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US (1) US3430532A (cs)
BE (1) BE717989A (cs)
CH (1) CH486987A (cs)
DE (1) DE1752695C3 (cs)
DK (1) DK123588B (cs)
ES (1) ES356378A1 (cs)
FR (1) FR1584021A (cs)
GB (1) GB1235926A (cs)
IL (1) IL30300A0 (cs)
NL (1) NL141487B (cs)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677673A (en) * 1970-08-25 1972-07-18 Pennwalt Corp Rotary press
US4297091A (en) * 1980-03-10 1981-10-27 Strefling Michael R Alfalfa pelletizing apparatus
EP0056213A1 (fr) * 1980-12-23 1982-07-21 Societe Nouvelle De Bouchons Plastiques S.N.B.P. Bouchon en matière plastique expansée
WO1988003469A1 (en) * 1986-11-03 1988-05-19 Eagle-Picher Industries, Inc. Rotary molding machine with vacuum venting means
WO1997014551A1 (en) * 1995-10-19 1997-04-24 I.M.A. Industria Macchine Automatiche S.P.A. Tabletting machine
US20030072799A1 (en) * 2001-09-28 2003-04-17 Sowden Harry S. Systems, methods and apparatuses for manufacturing dosage forms
US20100180757A1 (en) * 2009-01-19 2010-07-22 Agency For Defense Development Method and apparatus for loading cartridges with pressable plastic bonded explosives
CN103915029A (zh) * 2014-04-22 2014-07-09 西安科技大学 一种多级搅拌浆料充填模型试验系统及方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3107788C2 (de) * 1981-02-28 1982-11-25 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Verfahren und Vorrichtung zum Herstellen von Sprengkörpern mit einer Hauptladung und einer Übertragungsladung in einer Hülle
US7122143B2 (en) 2001-09-28 2006-10-17 Mcneil-Ppc, Inc. Methods for manufacturing dosage forms
MXPA04002977A (es) 2001-09-28 2005-06-20 Johnson & Johnson Forma de dosificacion que contiene una composicion de confiteria.
US7838026B2 (en) 2001-09-28 2010-11-23 Mcneil-Ppc, Inc. Burst-release polymer composition and dosage forms comprising the same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US901937A (en) * 1907-11-15 1908-10-20 Arthur Colton Company Tablet-forming machine.
US2043086A (en) * 1934-04-07 1936-06-02 Stokes Machine Co Tablet compressing machine
US3052919A (en) * 1960-05-09 1962-09-11 Western Electric Co Article-forming apparatus
US3084387A (en) * 1959-11-16 1963-04-09 Dake Corp Molding apparatus
US3098297A (en) * 1958-11-19 1963-07-23 Volma Nv Cheese mold assembly
US3103458A (en) * 1963-09-10 Process for making nitrocellulose pro-
US3234598A (en) * 1962-09-24 1966-02-15 Indiana General Corp Apparatus for pressing slurries
US3317999A (en) * 1965-10-23 1967-05-09 Purity Cheese Company Cheese molding press

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103458A (en) * 1963-09-10 Process for making nitrocellulose pro-
US901937A (en) * 1907-11-15 1908-10-20 Arthur Colton Company Tablet-forming machine.
US2043086A (en) * 1934-04-07 1936-06-02 Stokes Machine Co Tablet compressing machine
US3098297A (en) * 1958-11-19 1963-07-23 Volma Nv Cheese mold assembly
US3084387A (en) * 1959-11-16 1963-04-09 Dake Corp Molding apparatus
US3052919A (en) * 1960-05-09 1962-09-11 Western Electric Co Article-forming apparatus
US3234598A (en) * 1962-09-24 1966-02-15 Indiana General Corp Apparatus for pressing slurries
US3317999A (en) * 1965-10-23 1967-05-09 Purity Cheese Company Cheese molding press

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677673A (en) * 1970-08-25 1972-07-18 Pennwalt Corp Rotary press
US4297091A (en) * 1980-03-10 1981-10-27 Strefling Michael R Alfalfa pelletizing apparatus
EP0056213A1 (fr) * 1980-12-23 1982-07-21 Societe Nouvelle De Bouchons Plastiques S.N.B.P. Bouchon en matière plastique expansée
WO1988003469A1 (en) * 1986-11-03 1988-05-19 Eagle-Picher Industries, Inc. Rotary molding machine with vacuum venting means
WO1997014551A1 (en) * 1995-10-19 1997-04-24 I.M.A. Industria Macchine Automatiche S.P.A. Tabletting machine
US20030072799A1 (en) * 2001-09-28 2003-04-17 Sowden Harry S. Systems, methods and apparatuses for manufacturing dosage forms
US20040126425A1 (en) * 2001-09-28 2004-07-01 Sowden Harry S. Systems, methods and apparatuses for manufacturing dosage forms
US20040137057A1 (en) * 2001-09-28 2004-07-15 Sowden Harry S. Systems, methods and apparatuses for manufacturing dosage forms
US6767200B2 (en) * 2001-09-28 2004-07-27 Mcneil-Ppc, Inc. Systems, methods and apparatuses for manufacturing dosage forms
US7323129B2 (en) * 2001-09-28 2008-01-29 Omj Ireland Limited Systems, methods and apparatuses for manufacturing dosage forms
US7361006B2 (en) * 2001-09-28 2008-04-22 Mcneil-Ppc, Inc. Systems, methods and apparatuses for manufacturing dosage forms
US20100180757A1 (en) * 2009-01-19 2010-07-22 Agency For Defense Development Method and apparatus for loading cartridges with pressable plastic bonded explosives
CN103915029A (zh) * 2014-04-22 2014-07-09 西安科技大学 一种多级搅拌浆料充填模型试验系统及方法
CN103915029B (zh) * 2014-04-22 2016-01-20 西安科技大学 一种多级搅拌浆料充填模型试验系统及方法

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Publication number Publication date
DE1752695A1 (de) 1971-02-11
NL6809802A (cs) 1969-01-15
DK123588B (da) 1972-07-10
DE1752695C3 (de) 1978-09-21
GB1235926A (en) 1971-06-16
NL141487B (nl) 1974-03-15
CH486987A (de) 1970-03-15
BE717989A (cs) 1968-12-16
IL30300A0 (en) 1969-01-29
ES356378A1 (es) 1970-01-01
DE1752695B2 (de) 1978-01-12
FR1584021A (cs) 1969-12-12

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