US3726216A - Detonation device and method for making the same - Google Patents

Detonation device and method for making the same Download PDF

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US3726216A
US3726216A US00108712A US3726216DA US3726216A US 3726216 A US3726216 A US 3726216A US 00108712 A US00108712 A US 00108712A US 3726216D A US3726216D A US 3726216DA US 3726216 A US3726216 A US 3726216A
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approximately
accordance
detonation device
percent
weight
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B Calder
B Risko
R Belock
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Austin Powder Co
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Austin Powder Co
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/20—Vanadium, niobium or tantalum
    • B01J23/22—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B01J37/0217—Pretreatment of the substrate before coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B01J37/0221—Coating of particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/04—Mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3006—Ag as the principal constituent
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/04—Detonating fuses
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/08—Devices for the manufacture of fuses
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C22C5/08—Alloys based on silver with copper as the next major constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition

Definitions

  • ABSTRACT A detonation device and method for making the same for use in explosive hook-up systems of the type having interconnected trunk and down lines.
  • a core of pentaerythritol tetranitrate is compounded and constructed to substantially reduce detonation cut-offs when the lines are connected at an acute angle with respect to one another, particularly in the low grain load sizes.
  • SHEET 1 [IF 2 2s 30 BM Him i ⁇ 2 K' (F30 3 Q4 ([36 C: 220 7 12 36 24 28 32 ALTITU DE 4 I A i 9 0 g INVENTOR. BROOKE J. CALDER JR.
  • the present invention generally relates to detonating devices, and more particularly relates to an improved construction for a detonating device, such as a cord, fuse or the like, and a method of making the same for use in explosive hook-up systems of the types having in- 1 terconnected trunk and down lines for detonating multiple explosive charges.
  • the device of the invention is particularly useful in construction, excavation and mining applications where it is desirable to sequentially or simultaneously detonate a multiplicity of explosive charges via single or plural hook-up systems.
  • cord or fuse devices have heretofore been produced by either dry or wet loading processes, and generally include a raw core of dry or wet explosive about which is disposed an outside protective cover.
  • Explosive detonating cord may be categorized into two classes. There is the standard load size of about 50 grains per foot and higher and the so-called economy size of about grains per foot to about 40 grains per foot. While the aforesaid narrow angle juncture cutoffs are a slight problem in standard sizes, they are a major problem in the economy sizes. In the economy sizes, the explosive load is sufficiently decreased that the problem becomes of major importance and the careful tying of knots to prevent the angle cut-offs is particularly critical.
  • the present invention provides an improved construction for a detonating device, such as a cord, fuse or the like, and a method for making the same for use, as an example, in explosive hook-up systems which provides improved results in propagating through detonation cords disposed at narrow angles to each other for detonating multiple explosive charges.
  • the device of the invention has initiating characteristics sufficient to reliably detonate explosives, such as cap-sensitive explosives, without the requirement to take extreme precaution to insure that the trunklines and downlines are maintained at 90 with respect to one another or as close thereto as possible.
  • the invention assures that the detonation wave will bridge or propagate through the 0 knot connections without serving the down lines even when the latter are severely bent or slanted back in a direction toward the point of initiation.
  • the detonating cords can be dry loaded and are particularly useful in the economy load sizes.
  • the device of the invention is relatively rugged yet has good reliability characteristics.
  • it provides an arrangement which allows reliable knot connections which can easily be made with minimum time and effort under practically all environmental conditions.
  • the present invention results in a reduction in waste detonating cord or fuse material and the requirement to destroy waste pieces resulting from angular cut-offs.
  • the increased reliability of the present invention reduces the possibility of injury to person, or damage to property.
  • the detonating device and method for making the same having improved angle cut-off characteristics for use in explosive hook-up systems of the type having interconnected trunk and down lines comprising a core of indeterminate length containing pentaerythritol tetranitrate or the like encapsulated by an outer sheath, said core material including a mixture of particles having a very fine granulation to reduce detonation cutoffs when the lines are connected at an acute angle with respect to one another in a direction toward the point of initiation.
  • the device may be dry loaded. A correlation of parameters produce the desired result.
  • FIG. 1 is a diagrammatic illustration illustrating a typical explosive hook-up system which may be employed in accordance with the present invention
  • FIG. 2 is an enlarged, fragmentary view showing a typical knot connection for securing the respective down lines to the trunkline, as shown in FIG. 1;
  • FIG. 3 is an enlarged, fragmentary view illustrating the type of knot shown in FIG. 2, but with the down lines bent back at an acute angle in a direction toward the point of initiation;
  • FIG. 4 is a graphic representation of a typical method for determining the angular cut-offs in accordance with the present invention
  • FIG. 5 is a fragmentary side elevation view of a piece of detonating cord or fuse made in accordance with the invention.
  • FIG. 6 is an enlarged sectional view taken along the line 66of FIG. 5;
  • FIG. 7 is'a schematic representation showing a flow system for making the detonating device in accordance with the invention.
  • the system S includes a trunkline 2 that extends along the center of an excavation 4, such as a ditch or the like, which may be employed, for example, in a pipeline construction.
  • a plurality of down lines 6, 8, 9, l and 12 are attached via connections 14, 16, 18, and 22 at one end to the trunkline 2.
  • the other ends of the respective down lines are attached to explosive charges 24, 26, 28, 30 and 32 which may be disposed in shot holes in the ditch 4.
  • the trunkline 2 is initiated at one end by electric blasting caps 34 which, in turn, are connected in circuit to a blasting machine 36 of a type known in the art.
  • a blasting machine 36 of a type known in the art.
  • any suitable type of hook-up system may be employed depending upon the particularl type of blasting operation.
  • instantaneous firing of the multiple hook-up system S may be achieved by actuating the blasting machine 36 which activates or sparks the electric blasting caps 34.
  • Activation of the blasting caps 34 initiates the trunkline 2 which produces an explosive shock or detonating wave which travels along the trunkline 2 and down the respective down lines 6, 8, etc. via the bridging connections i4, 16, etc. so as to provide a substantially simultaneous detonation of the charges 24, 26, etc.
  • various attachments may be made for connecting the respective down lines to the trunkline.
  • the down lines may be attached by various knot connections, such as a double wrap half hitch, loop lock clove hitch, clove hitch and the like.
  • FIG. 2 there is illustrated a double wrap half hitch 40 which is prepared with the down line 6, and which is drawn tightly around the trunkline 2.
  • the trunkline 2 is oriented in the direction of initiation (as shown by arrow) which extends in a direction away from the blasting cap 34.
  • FIG. 3 there is illustrated a typical angle cut-off when the downline 6 slants back at an acute angle (b) in a direction toward the blasting cap or point of initiation.
  • the blasting effects from the trunkline 2 act to sever the down line 6, as at 42, before it is detonated through the knot 40. It is believed that such failures are caused by the explosive force, which is propagated by detonation of the trunkline, which severs the down line before the detonation wave has been transmitted through it via the knot connection.
  • the device of the present invention enables the down line, for example, to be attached via knot connections so that, as tied, the down line may slant back at an acute angle with respect to the trunkline.
  • the down line may be slanted at least from the vertical or at an acute angle of 10 with respect to the trunkline.
  • the angular disposition of the knot connection may be determined, for example, by reference to the diagrammatic representation of FIG. 4.
  • the test may be carried out by securing a piece of detonating cord or fuse between two points A and B at a distance of ten feet apart. Another length of cord or fuse may be secured between the points C and D to provide the proper acute angle 0. This angle may be achieved by measuring three feet along the hypotenuse and by adjusting the altitude to the corresponding length.
  • a knot may then be tied with the length CD such that OD lies next to OB at the knot. The distances from the knot to each end (0C and OD) may then be recorded, the blasting cap 34 fired and any undetonated pieces measured with the distance from the knot to the cut-off recorded.
  • the fuse includes an explosive core 50 which is encapsulated by an outer sheath, designated generally at 52, which provides a protective cover for the core.
  • the sheath 52 includes an inner layer 54 which may be in the form of a fibrous tape, such as paper, which may be applied longitudinally with respect to the axis of the core 50 to provide a generally cylindrical sleeve for supporting the core in columnar relation.
  • the layer 54 is preferably comprised of a fibrous material, such as crepe paper, it is to be understood that other materials, such as plastic, fiberglass-plastic composite or the like, in tape or ribbon form may be employed to give the column of explosive body during the loading operation.
  • the tape for providing the layer 54 may have a width of approximately one-half inch with a thickness of about 0.003 inches.
  • a textile layer 56 Disposed around the fibrous layer 54 is a textile layer 56 which may include ten l0) strands wrapped in countering relation around the layer 54.
  • the textile layer 56 may include materials, such as cotton, rayon, jute and the like having a denier in the range from about 1,100 to about 2,200.
  • the textile layers 56 and 58 are preferably encapsulated by a relatively thin barrier layer 60.
  • the barrier 60 is preferably made from a material having good strength and moisture impervious characteristics.
  • the barrier is made from a relatively thin polymeric material, such as polyethylene, polyvinyl chloride, polyethylene terephthalate or the like.
  • the barrier 60 may be applied in ribbon or tape form and spirally wrapped in overlapping relation to provide the desired characteristics. In such case, the barrier 60 may have a thickness in the range from about 0.003 to about 0.03 inches.
  • an outer textile layer 62 Disposed around the barrier layer 60 is an outer textile layer 62 which, in the form shown, may include ten (10) string like strands of twisted construction which are wrapped in countered relation around the barrier 60.
  • the textile layer 62 is covered with another textile layer 64 of similar construction, but countered in the opposite direction around the layer 62.
  • the layers 62 and 64 may be made of the same materials and with the same denier as the inner layers 54 and 56.
  • the layers 62 and 64 not only add protection to the core but facilitate tying of the knot connections and protect the barrier layer 62 against abrasion.
  • the composite sheath 52 may then be provided with an outer protective layer 66.
  • This layer is preferably comprised of a water-repellent material, such as wax or the like. This material may be dip coated or otherwise applied to the layer 64 to enhance the water-repellent characteristics of the device to facilitate making the knot connections during normal use thereof.
  • the completed detonation cord core composition has a selected grain size mixture of very fine granulation.
  • This final, or completed, granulation should have a maximum limit for retention of particles on a 100 mesh sieve (United States Standard Sieves being used throughout this disclosure) of approximately percent by weight. Preferably, less than this amount is retained on a 100 mesh sieve. Since the additives to the PETN in the core of the invention are present in small amounts, the above specified granulation parameters are applicable interchangeably to the PETN alone or to the total core composition. Such granulation is of particular need in the about 15 grains per foot to the about 40 grains per foot grain load sizes. By the novel method of loading, such grain sizes can be used in a dry loading process. This is accomplished by the use ofa flow agent during loading.
  • a further important factor is the control of the speed of flow of the explosive material during loading.
  • the first step in the method of the preferred embodiment is to initially treat the PETN with an anti-static agent to enhance the flow characteristics of it, as desired.
  • the material may be rinsed or washed with an aqueous solution, such as an aqueous solution of the saturated, long chain or fatty alcohol sulfates sold by E. I. du Pont de Nemours & Company under the trade name Duponol G.”
  • the washed explosive is preferably filtered to remove excess of the anti-static solution and then dried to a moisture content less than approximately 1 percent by weight prior to further processing of the PETN.
  • the anti-static material is present in the range from approximately five parts per million to 1,000 parts per million, based on the weight of the PETN.
  • drying step is illustrated schematically, as at 70.
  • This drying step can be accomplished by means of suitable heat applicators (not shown) so as to reduce the moisture content to the desired level aforesaid, and preferably to less than approximately 0.1 percent by weight.
  • the dried material having the selective granulation, as above specified is then blended, as at 72, with the preferred amount of a free-flow agent so as to provide the desired free flow properties in the material.
  • an anti-wicking'agent may be blended with the PETN contemporaneously with the blending of the flow agent.
  • the flow agent is of relatively fine particle size.
  • a material classified as fumed silica sold under the trade name CAB-O-SIL sold by Cabot Corporation produces beneficial results. This material is produced by the hydrolysis of silicon tetrachloride at l,100C. which results in a colloidal silica of high purity.
  • the basic chemical equation for formation of this material is as follows:
  • This fumed silica material has considerable surface area in the range from approximately 400 square meters per gram to approximately 50 square meters per gram.
  • such material has a sub-microscopic particle size in the range from approximately 0.007 to approximately 0.012 microns which, when blended with the PETN, enhances its free-flow characteristics. It has been found that when this agent is added to the explosive in an amount from approximately 0.05 percent to approximately 0.5 percent by weight of the PETN superior results are achieved.
  • this flow agent in limited amounts not only enhances the flow properties of the material, but does so in a manner so as not to significantly affect the sensitivity of the explosive material.
  • this flow agent provides a flow rate through an opening having a diameter of 0.18 inches of from approximately 90 to approximately 140 seconds per fifty (50) grams.
  • Another desirable characteristic of this flow agent is its water insolubility.
  • Another water insoluble and finally divided material that may be employed is calcium stearate. Such material may be blended in an amount from approximately 0.1 percent to approximately 0.5 percent based on the weight of the PETN.
  • desirable results may 'be achieved by mixing the fumed silica with the calcium stearate in proportions such that a major amount of silica is mixed with a minor amount of calcium stearate.
  • a material sold under the trade name CMC available from E. I. du Pont de Nemours & Company provides beneficial results.
  • This material is the sodium salt of carboxymethylcellulose (cellulose glycolate) formed by the reaction of high purity soda cellulose with the sodium salt of monochloroacetic acid. The reaction may be represented as:
  • Other materials which may be employed include natural gums, such as guar gum and the like to provide the desired anti-wicking properties. Such agents may be added in the range from about 0.05 percent to 0.5 percent based on the weight of the PETN.
  • the core may then be formed into columnar form by providing the core with an outer sheath 52.
  • this may be accomplished by employing a center thread or string 74 in conjunction with a gravity feed device, designated generally at 76.
  • the device 76 includes a funnel-like hopper 78 having a reduced diameter neck portion 80 into which is discharged the granulated explosive mixture which flows via the string 74 under gravity through the neck 80.
  • the neck 80 may have a diameter of about 0.180 inches.
  • the explosive charge flows through the neck 80 it is given the core shape 50 and is encapsulated by the layer of fibrous material 54 (i.e.
  • crepe paper which may be in the form of a ribbon or tape.
  • the inner textile layers 56 and 58 may then be applied with a tension from about 6 to 112 pounds per strand in counter relation by means of suitable textile spinning machines (not shown), as known in the art.
  • the textile layer 58 may then be encapsulated by the polymeric layer 60 which may be applied in ribbon or tape form or by extrusion techniques, as known in the art.
  • the outer textile layers 62 and 64 may then be applied in counter relation in a manner similar to application of the textile layers 56 and 58.
  • the composite fuse or cord may then be treated with the outer layer of wax 66 or the like to provide the finished article by a substantially continuous process.
  • the apparent or effective core density may be desirably increased, as aforesaid, without a separate crushing operation.
  • increase in core density may be achieved by the amount of tension or pressure applied to the respective textile strands or yarns during the counter application thereof.
  • the flow rate of loading must be adjusted so that it is neither too slow nor too fast.
  • the desired flow rate is between seconds per 50 grams and 140 seconds per 50 grams with a measurement factor of :8 seconds at either limit through an opening having a diameter of 0.18 inches.
  • a dryloaded detonation core which includes a core of PETN or like explosive material of very find particle granulation.
  • the core composition has a screen analysis such that less than approximately 15 per cent by weight is retained on a mesh sieve.
  • this reduction in grain size may be expressed in terms of the number of percentage units lost in the loading process at 100 mesh and has a value of less than approximately 20 percentage units.
  • the preferred embodiment detonation cord has a grain laod from approximately 15 grains per foot to approximately 40 grains per foot of the length of the device. It is in this grain load range in which the most significant improvement in low angle reliability is found.
  • the granulation of the invention may be useful in improving low angle performance in higher grain load sizes, such as approximately 50 grains per foot and higher.
  • the very fine granulation of the PETN with a relatively low core density, such as from approximately 1.30 grams per cubic centimeter to approximately 1.55 grams per cubic centimeter.
  • each cord comprised a mixture of 0.2 percent by weight (of the total mass) of CMC, a polymeric cellulose derived anti-wicking agent, commerically available from E. I. du Pont de Nemours & Co.; 0.3 percent by weight (of the total mass) of CAB-O-SIL, a fumed silica flow agent commercially available from the Cabot Corporation; and the remainder by weight (of the total mass) of PETN which had been treated with DUPONOL G.
  • CMC 0.2 percent by weight (of the total mass) of CMC
  • CAB-O-SIL a fumed silica flow agent commercially available from the Cabot Corporation
  • PETN which had been treated with DUPONOL G.
  • Granulation index is the average of the sum of the cumulative amount of each sieve.
  • An index of 100 represents material that is all greater than 30 mesh while an index of represents material that is less than 325 mesh. The index is comparable only with indexes derived from the same set of sieves.
  • CHARACTERISTICS AFTER LOADING (Examples 1 to 4) (Examples 1 to 4) Ex. 1 Ex. 2 Ex. 3 Ex. 4 Grain load (grains/ft.) 37.8 38.1 36.6 34.8 Core density (g/cc) 1.37 1.50 1.33 1.35 Apparent density (g/cc.) 0.98 1.04 1.05 1.02 Acetone insoluble 0.45 .50 0.40 0.39
  • a detonation cord device adapted to provide improved angle cut-off characteristics when used in explosive hook-up systems of the type having interconnected trunk and down lines comprising a core of indeterminate length containing pentaerythritol tetranitrate explosive particles,
  • said core having a grain load of said explosive particles from approximately grains per foot to approximately 40 grains per foot of length of said device
  • said core having a density from approximately 1.30 grams per cubic centimeter to approximately 1.55 grams per cubic centimeter
  • said explosive particles prior to loading have the following granulation analysis:
  • said sheath further includes an inner layer of tape disposed between said core and said first inner textile layer.
  • a second inner textile layer is disposed between said wherein first inner textile and said barrier layer.
  • an outer protective layer is disposed around said first 14.
  • a detonation device in accordance with claim 1 said first and second inner textile layers are disposed wherein in counter relation with respect to said core, and said core includes an anti-static agent. are applied at a tension in the range from a o i- 19.
  • a detonation device in accordance with claim 18 mately 6 pounds to approximately 12 pounds per wherein strand. said anti-static agent is present in an amount from 15.
  • a detonation device in accordance with claim 11 ppr xim ly five p r per milli n t0 appr xih in mately 1,000 parts per million, based on the a second outer textile layer is disposed between said Weight of Said BXPIOSiW P t l s.
  • a detonation device in accordance with claim 1 16.
  • a detonation device in accordance with claim Wherem Said CUTE includes ami'wicking agenth i 15 21.
  • a detonation device in accordance with claim said first and second outer textile layers are disposed WherFm in counter relation with respect to said core, and 531d antl'Yvlckmg agent 15 Present arflolmt from are applied at a tension in the range from approxiapproximately P F to RP y mately 6 pounds to approximately 12 pounds per percent, based on the weight of said explosive par- Strand 20 ticles. 17.

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  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
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US00108712A 1962-09-07 1971-01-22 Detonation device and method for making the same Expired - Lifetime US3726216A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB34299/62A GB1044379A (en) 1962-09-07 1962-09-07 Improvements relating to brazing alloys
US10871271A 1971-01-22 1971-01-22
US329842A US3860677A (en) 1962-09-07 1973-02-05 Method for making detonation cord device

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US329842A Expired - Lifetime US3860677A (en) 1962-09-07 1973-02-05 Method for making detonation cord device

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NL (1) NL298154A (ko)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024817A (en) * 1975-06-02 1977-05-24 Austin Powder Company Elongated flexible detonating device
US4083305A (en) * 1976-04-28 1978-04-11 Teledyne Mccormick Selph, An Operating Division Of Teledyne Ind. Inc. Mild detonating cord confinement
US4178853A (en) * 1976-04-28 1979-12-18 Teledyne Mccormick Selph, An Operating Division Of Teledyne Industries, Inc. Mild detonating cord confinement
US5212341A (en) * 1991-08-15 1993-05-18 Osborne Alfred M Co-extruded shock tube
US5322018A (en) * 1991-11-27 1994-06-21 The Ensign-Bickford Company Surface-initiating deflagrating material
EP0874792A1 (en) * 1996-01-18 1998-11-04 The Ensign-Bickford Company Connector for blast initiation system
US5939661A (en) * 1997-01-06 1999-08-17 The Ensign-Bickford Company Method of manufacturing an explosive carrier material, and articles containing the same
WO2005119167A2 (en) * 2004-06-01 2005-12-15 Ensign-Bickford Aerospace & Defense Company Detonating cord with protective jacket
US20080142635A1 (en) * 2006-10-13 2008-06-19 Manfredi Dario P Aircraft safety system
US20200024212A1 (en) * 2016-03-18 2020-01-23 Goodrich Corporation Methods and systems for an explosive cord

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JP7014003B2 (ja) * 2018-03-28 2022-02-01 住友金属鉱山株式会社 はんだ接合電極およびはんだ接合電極の被膜形成用銅合金ターゲット

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US3155038A (en) * 1962-09-21 1964-11-03 Ensign Bickford Co Detonating fuse
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US3368485A (en) * 1966-04-08 1968-02-13 Robert L. Klotz Nonexplosive detonating fuse directional interrupter
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US3155038A (en) * 1962-09-21 1964-11-03 Ensign Bickford Co Detonating fuse
US3368485A (en) * 1966-04-08 1968-02-13 Robert L. Klotz Nonexplosive detonating fuse directional interrupter
US3435764A (en) * 1967-11-13 1969-04-01 Ensign Bickford Co Dormant explosive device

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024817A (en) * 1975-06-02 1977-05-24 Austin Powder Company Elongated flexible detonating device
US4083305A (en) * 1976-04-28 1978-04-11 Teledyne Mccormick Selph, An Operating Division Of Teledyne Ind. Inc. Mild detonating cord confinement
US4178853A (en) * 1976-04-28 1979-12-18 Teledyne Mccormick Selph, An Operating Division Of Teledyne Industries, Inc. Mild detonating cord confinement
US5212341A (en) * 1991-08-15 1993-05-18 Osborne Alfred M Co-extruded shock tube
US5322018A (en) * 1991-11-27 1994-06-21 The Ensign-Bickford Company Surface-initiating deflagrating material
EP0874792A1 (en) * 1996-01-18 1998-11-04 The Ensign-Bickford Company Connector for blast initiation system
EP0874792A4 (en) * 1996-01-18 2003-03-19 Ensign Bickford Co CONNECTION ELEMENT FOR EXPLOSION AMOR AGE SYSTEM
US5939661A (en) * 1997-01-06 1999-08-17 The Ensign-Bickford Company Method of manufacturing an explosive carrier material, and articles containing the same
WO2005119167A2 (en) * 2004-06-01 2005-12-15 Ensign-Bickford Aerospace & Defense Company Detonating cord with protective jacket
WO2005119167A3 (en) * 2004-06-01 2006-08-10 Ensign Bickford Aerospace & De Detonating cord with protective jacket
US20080028970A1 (en) * 2004-06-01 2008-02-07 Walsh Brendan M Detonating Cord With Protective Jacket
US7921776B2 (en) 2004-06-01 2011-04-12 Ensign-Bickford Aerospace & Defense Company Detonating cord with protective jacket
US20080142635A1 (en) * 2006-10-13 2008-06-19 Manfredi Dario P Aircraft safety system
US7934682B2 (en) * 2006-10-13 2011-05-03 Manfredi Dario P Aircraft safety system
US20200024212A1 (en) * 2016-03-18 2020-01-23 Goodrich Corporation Methods and systems for an explosive cord
US10793486B2 (en) * 2016-03-18 2020-10-06 Goodrich Corporation Methods and systems for an explosive cord

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US3860677A (en) 1975-01-14
BE637659A (ko)
GB1044379A (en) 1966-09-28
GB1051877A (ko)
BE637059A (ko)
NL298154A (ko)

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