FILM EFFECT IGNITIONERS AND METHOD FOR MANUFACTURING THEM

Description

[0001] The invention relates to a film effect igniter and a method for manufacturing a film effect igniter. background

[0002] Such film effect detonators are used in conjunction with film, television, or theater recordings to scenically depict projectile impacts or to pyrotechnically power mechanical special effects equipment. A film effect detonator is disclosed, for example, in document DE 101 64 381 B4. The known film effect detonator is characterized by an initiating explosive, which is a non-toxic metal salt of mono- and / or hydroxyazobenzene. Furthermore, the known film effect detonator comprises a passivator as well as tetrazole compounds of highly nitrated aromatic compounds and a non-toxic metal salt of dinitrobenzofuroxane.

[0003] Document DE 195 33 487 A1 discloses ignition sets for igniters and ignition elements, designed as a combination of two ignition sets, wherein a first ignition set (heat wire set) contains at least one initiating explosive. A second ignition set serves as the power set.

[0004] Document US2016 / 0054111A1 relates to an electric detonator with an initial detonator charge and a primary detonator charge, wherein the initial detonator charge contains a first primary detonator and a second primary detonator. Summary

[0005] The object of the invention is to provide a film effect detonator and a method for its manufacture, which enables the provision of a low-pollutant film effect detonator in a simple and efficient manner, which has the necessary explosive force.

[0006] To solve this problem, a film effect detonator according to independent claim 1 and a method for manufacturing a film effect detonator according to independent claim 4 have been provided. Embodiments are the subject of dependent subclaims.

[0007] The use of silver azide as the primer in the detonator charge enables the film effect detonator to be manufactured without heavy metals, while still providing sufficient explosive power. Less visible smoke is produced. A faster, shorter detonation flash has been observed, resulting in a "better image" for film and television recording (a more realistic visual representation of the bullet impact). The detonation pressure is higher due to the use of silver azide (with the same design).

[0008] Silver azide can be produced in various ways, for example using sodium azide (NaN₃) and silver nitrate (AgNO₃), each dissolved in water. Silver azide can then be obtained via a precipitation reaction. This is followed by washing. The silver azide can be activated by drying the resulting wet material.

[0009] The explosive charge of the film effect detonator consists of a main explosive charge and is free of a pilot charge. In this design, the explosive charge contains no additional explosives besides the main charge. A pilot charge is therefore unnecessary.

[0010] The glowing filament can have a corrosion-resistant coating, at least in the section of wire that is in contact with the propellant charge. This coating protects the section of the glowing filament against corrosion, particularly against the corrosive effects of the propellant charge. This enhances the operational reliability of the film effect igniter.

[0011] The corrosion protection coating of the film effect igniter can be formed or produced by means of an adhesive agent applied to the heating wire in the area of ​​the wire section. It is possible that the adhesive agent applied as a corrosion protection coating is the same adhesive agent used to bond components together during the manufacture of the film effect igniter, in particular by gluing. The corrosion protection coating can then be produced by applying the adhesive or glue.

[0012] The film effect fuse has a carrier that provides a receptacle for the heating wire and the propellant charge. The heating wire and the propellant charge are arranged, at least partially, on the carrier. The carrier can be bonded to the heating wire and / or propellant charge by means of an adhesive. The carrier can be, for example, a disc, a ring, or a cylindrical sleeve. The ring can have a base, providing a receptacle within the ring for the heating wire and the propellant charge. Similarly, the heating wire and propellant charge can be at least partially contained within the interior of the sleeve. The propellant charge on the carrier can be covered by a cover, which is, for example, glued on.In one embodiment, the explosive material loading can be arranged in a receiving chamber surrounded on several sides, which can be essentially closed.

[0013] Support sections of the carrier that are in contact with the explosive charge are at least partially made of a material that absorbs moisture from the explosive charge. This embodiment is particularly advantageous if the explosive charge is initially manufactured as a moist material and applied to the carrier. The support section then serves to absorb the moisture from the moist material and release it into the environment. The carrier can consist essentially entirely of the moisture-absorbing and -carrying material. The material of the support section can, for example, be paper or cardboard. If the carrier includes a cover for the explosive charge, this cover can also be made of the moisture-absorbing material and thus contribute to drying the explosive charge.

[0014] In connection with the method for manufacturing the film effect detonator, the preceding explanations regarding its design apply accordingly. Furthermore, the following specifications may be included.

[0015] The explosive charge can be applied as wet material, and the wet material can then be dried to activate the active ingredient.

[0016] In this process, a corrosion protection coating can be applied to the heating wire, at least in the area of ​​the wire section that comes into contact with the ignition material, before loading. The corrosion protection coating can be applied and then dried. The coating can consist of an adhesive, for example, glue or adhesive.

[0017] In this process, a holder of a carrier that accommodates the glowing wire is loaded with the ignition material.

[0018] Support sections of the carrier that come into contact with the explosive material during loading absorb moisture from the explosive material and thus contribute to its drying. Description of exemplary implementations

[0019] Further examples of implementation are explained in more detail below with reference to figures in a drawing. These show: Fig. 1 is a schematic representation of a film effect fuze in which a carrier is formed with a ring; and Fig. 2 is a schematic representation of another film effect fuze in which a carrier is formed with a sleeve.

[0020] The Fig. 1Figure 1 shows a schematic representation of a film effect detonator 1, in which a ring 2 forms a carrier on which an explosive charge 3, forming an active ingredient, is arranged. The explosive charge 3 also surrounds a glow wire 4, which is connected in the area of ​​contact points 5 to connecting wires 6. These wires are twisted in a central section and have separate ends 7 at the ends. An adhesive bond is formed between the connecting wires 6 and the ring 2 in a section 8 of the ring 2.

[0021] An electrical voltage can be applied via the separated ends 7 to make the glowing wire 4 glow, so that the ignition charge 3 of the film effect igniter 1 is ignited.

[0022] To simplify the presentation, in Fig. 1A cover (not shown) is provided that can enclose the ring 2 and the detonating agent 3 with the glowing wire 4 contained therein. The ring 2 and the cover (not shown) can be made of a material that absorbs moisture from the detonating agent 3 and releases it to the outside, for example, paper or cardboard. This allows the detonating agent 3 to be applied initially as a moist material, optionally pressed in, and then dried for activation. This drying process is facilitated by the material that wicks the moisture away from the detonating agent 3. Drying can be carried out in air and / or in a drying oven, depending on the specific design.

[0023] Fig. 2Figure 1 shows a schematic representation of another film effect fuse 10, in which a sleeve 11 forms a carrier in which the primer charge 3 with the embedded glow wire 4 is arranged. For identical features, see Figure 1. Fig. 2 the same reference symbols as in Fig. 1 used.

[0024] The glowing filament 4 is connected via the contact points 5 to the connecting leads 6, the separate ends 7 of which serve to connect an electrical energy source. In the embodiment in Fig. 2 An insulating plug 12 is also provided, which is likewise arranged in the cylindrical sleeve 11. The connecting leads 6 run through the insulating plug 12.

[0025] The sleeve 11 is made of a material that can absorb moisture from the primer 3 and wick it away, thus facilitating the drying of the primer 3 after it has been applied as a moist material. For example, the sleeve 11 can be made of cardboard or paper.

[0026] The further film effect trigger in Fig. 2 It also has a cover 13, which may also be made of moisture-repellent material.

[0027] The various embodiments of the film-effect detonator 1, 10 have in common that the detonating agent 3 contains silver azide. Sodium azide (NaN₃) and silver nitrate (AgNO₃) can be used as raw materials to produce silver azide, for example, by dissolving the raw materials in water. A moist detonating agent, which is inactive in water, is produced by means of a precipitation reaction. The silver azide can then be filtered out, providing a moist material that can be applied to the corresponding carrier of the film-effect detonator 1, 10. Drying then takes place to activate the detonating agent.

[0028] In the manufacture of the respective film effect detonator 1, 10, it may be provided that, prior to the application of the detonating material 3 (for example, as a wet material), the heating wire 4 is at least partially coated with a corrosion protection coating in order to prevent corrosion of the heating wire 4 and thus maintain the functionality of the film effect detonator 1, 10 even during prolonged storage. In one embodiment, the corrosion protection coating may be formed using an adhesive material, for example, glue or adhesive, which is then also used for bonding other components of the film effect detonator 1, 10, for example, gluing on the cover 13.

Claims

1. A film effect igniter (1, 10), with: - an electrical connection line (6); - a glow wire (4) which is connected with the electrical connection line; and - a primary explosive charge (3), with which an effective unit is formed that can be ignited by means of the glow wire (4); wherein the primary explosive charge (3) consists of a main primary explosive charge, which is formed with silver azide as primary explosive, and is free from an initial primary explosive charge, characterised by a carrier, by which a receptacle for the glow wire (4) and the primary explosive charge (3) are provided, wherein carrier portions of the carrier which are in contact with the primary explosive charge (3) are, at least in portions, made of a material that takes up moisture from the primary explosive charge (2).

2. The film effect igniter (1, 10) according to claim 1, characterised in that the glow wire (4) comprises an anti-corrosion coating at least in the region of a wire portion which is in contact with the primary explosive charge (3).

3. The film effect igniter (1, 10) according to claim 2, characterised in that the anti-corrosion coating is formed by means of an adhesive that is applied to the glow wire (3) in the region of the wire portion.

4. A method for producing a film effect igniter (1, 10), with: - providing an electrical connection line (6); - connecting a glow wire (4) to the electrical connection line (6); and - charging with a primary explosive charge (3), by which an effective unit is formed that can be ignited by means of the glow wire (4); wherein the primary explosive charge (3) consists of a main primary explosive charge, which is formed with silver azide as primary explosive, and is formed free of an initial primary explosive charge, characterised in that a receptacle of a carrier which receives the glow wire (4) is charged with the primary explosive charge (3), wherein carrier portions of the carrier which come into contact with the primary explosive charge (3) during charging take up moisture from the primary explosive charge (3) and hereby contribute to its drying.

5. The method according to claim 4, characterised in that the primary explosive charge (3) is applied as a moist material, and the moist material is subsequently dried, activating the effective unit.

6. The method according to claim 4 or 5, characterised in that, before charging, an anti-corrosion coating is applied to the glow wire (4), at least in the region of a wire portion that comes into contact with the primary explosive charge (3).