WO1980000119A1

WO1980000119A1 - Process and device for gas treatment

Info

Publication number: WO1980000119A1
Application number: PCT/DE1979/000061
Authority: WO
Inventors: James R Allen; Wolfgang F Friemel
Original assignee: Freyberg Chem Fab Werner
Priority date: 1978-06-22
Filing date: 1979-06-22
Publication date: 1980-02-07
Also published as: IL57498A; KE3316A; AU4825679A; IT1117246B; DD144349A5; FR2428974A1; AU528417B2; AR228128A1; GB2046577B; NL7904913A; IL57498A0; BR7903925A; FR2428974B1; CY1189A; IT7949473A0; NL190773B; DE2952921D2; NL190773C; PH18496A; GB2046577A

Abstract

A preparation of metal phosphore prepacked preferably in crap paper bags is sealed between two layers of a moisture-free, non-hygroscopic, flexible, plastic sheet band, of which at least one layer let moisture pass through. Pockets for the preparation are formed by means of welding beads made at regular intervals transversally to the band. The welding beads arranged between the pockets make up inflexion points. Then, the band (1) containing the bags and having a length comprised between 3 and 10 m. is wound so as to form a cylindrical body (39) which is introduced into an air tight tin box. The box is open only just before making use of the preparation at the location of the gas treatment. The band is unwound onto the surface of, for example, a bulk material to be treated such as wheat and is extended freely. The gasing bottle is kept sealed until the end of the gasing, i.e. during several days. Following a reaction of the preparation with the air moisture, very toxic gases phosphorous hydrogen are formed which, during gasing, diffuse slowly through all the bulk material. A the end of the gasing, the band containing eventually remains of the preparation is removed, wound and evacuated for destruction.

Description

Fumigation process and device

The present invention relates to a method for fumigation of a closed space and its contents, wherein toxic fumigant gas is developed in the space as fumigant by the reaction of a hydrolyzable metal phosphide pesticide with atmospheric moisture until the available phosphine content of the agent is practically completely released, whereby the room remains tightly closed and the room is only opened after a contact time of the gas of several days in order to remove the residues of the agent, and the pesticide is used in several measured portions wrapped in a moisture-permeable covering.

Such methods are already known, Lind are used primarily for the destruction of pests in agricultural stocks such as animal feed, grain, beans, peanuts, tobacco and the like in premises such as silos, grain bunkers, grain mills, warehouses, feed mills, steel tanks and steel containers. The invention is particularly aimed at the use for gassing supplies in transport, in particular in railway wagons, barges and ship holds. Known metal phosphide pesticides contain, as the active ingredient, suitable hydrolyzable metal phosphides, such as magnesium phosphide or aluminum phosphide, mostly the latter. This reacts spontaneously with air humidity, whereby highly toxic phosphorus hydrogen gas is formed, which can also lead to serious damage to health and death in humans. At the end of the fumigation period, a residue remains that can still contain residues of the unreacted metal phosphide.

For the gassing of bulk goods, such as wheat or corn, the pesticide in pelletized or tablet form can be metered directly into the grain when it is poured into the storage container (DPS 1 143 053). However, this method of operation can only be used under certain circumstances. Sometimes the residue of the agent has to be separated before use or further processing of the goods, which is laborious and time-consuming.

A method (DPS 698721) in which the metal phosphide in powder or granule form is mixed with self-inflammatory agents, in measured portions prepacked in porous crepe paper bags as a moisture-permeable wrapper, has proven particularly useful. Since the gas evolution takes place in an exothermic reaction, the portions or the contents of each bag are limited to a maximum of a few decagrams. As soon as this prey is removed from its packaging and comes into contact with air humidity, hydrogen phosphide gas is released at a practically controlled rate, wherein the solid agent or the powdery residue remaining after the reaction of the agent is safely retained in the bag. So far, these bags have been introduced in large numbers manually or with manually operated mechanical devices after filling the storage container in a distribution that is as uniform as possible as deep as possible into the interior of the goods. To facilitate subsequent removal, the bags were lined up and tied, for example by means of eyelets at the end of the bag. The process is labor intensive and costly. Substantial precautions are necessary so that workers are not exposed to the toxic gases for too long or in excessively high concentrations. The gas evolution of the bags begins immediately after they are removed from the airtight packaging. The introduction of the bags must therefore take place so quickly that the workers can leave the fumigation room before dangerous or even life-threatening concentrations have formed. When gassing large quantities of bulk goods such as grain in large storage rooms, for example ship loading rooms, a large number of bags have to be introduced. This is difficult to do within a safe time.

After the fumigation has ended, all of the bags buried deep in the bulk material must be removed. There is always a risk that individual bags remain, e.g. when they break free of the cord,

Empty rooms can also be fumigated with the bags mentioned, which are then hung on cords in the room. There have also been proposed special application devices for fumigating empty spaces and stacks of bags, but these are not suitable for introduction into cereals or the like. One of the most recent proposals of this type (DAS 2 206 487) is a semi-rigid plastic strips, about 12.5 cm x 50 cm in size, with a plurality of trough-shaped depressions, each of which contains a metal phosphide tablet and is sealed with a moisture-permeable cover made of Japanese paper.

Previous attempts to introduce the pesticides in tubular application devices encased in the bulk material, for example grain, have been unsatisfactory. The tubular bodies had to be mechanically very strong. The materials used for this were not only very expensive, but also contained so much moisture that the pesticide could not be produced without decomposition in such devices and could only be stored after a long period of calm.

The present invention aims at a new method of the type mentioned, and an apparatus therefor, by means of which large amounts of metal phosphide can be filled practically without decomposition and then stored and dispatched long and safely until the actual application, and then at the fumigation site in the shortest possible time and can be used with the least amount of work, while after the fumigation the residues are removed quickly and safely. In this way, considerable time savings and significantly greater safety can be achieved and who meets the highest hygienic requirements.

According to the invention, this is achieved in that, in a method of the type mentioned at the outset, the portions of the agent are enclosed in a plurality of pockets which are attached in a moisture-permeable, moisture-free, non-hygroscopic, flexible, tear-resistant application device over the length of the application device, so that the application device is opened in a coherent manner - rolled or unfolded form is sealed in an airtight and moisture-free storage container, which the application device prior ^¬ the application is removed only immediately after which the application device unfolded or unwound and designed exposed in the air-moisture-containing space in the open state and left in contact with atmospheric humidity, and that after opening the room after the exposure to gas, the device with the pockets containing the residues of the pesticide is removed as a whole from the room, being rolled up or wound up and being removed for disposal.

The flexible application device according to the invention can have a length of several meters, which is only limited by such factors as easy handling, weight of the filled application device, the length to be accommodated in airtight storage containers of conventional size, and the dimensions of the rooms which are gassed with the application device should. The length is expediently between 3 and 25 m, e.g. 3 to 10 m, preferably 4 1/2 m, the pockets being evenly distributed over this length.

In the preferred method, a suitable number of these application devices, which can release an amount of gas calculated on the space and the goods or treasures stored therein, are unrolled on the surface of these goods; in unrolled form, the application devices release the gas, which then diffuses down into these goods. In contrast to the previously known methods, the application device does not have to be embedded deeply in the goods. It has surprisingly been found that the phosphine gas diffuses downwards and into sufficient concentration can penetrate into the goods, so that the desired pest control effect is also achieved when grain debris, such as corn or wheat, has been heaped up at a height of 1 to 60 m, preferably 2 to 40 m.

Usually several application devices are placed on the surface at certain intervals so that the pesticide is relatively evenly distributed over this surface.

If the goods have been piled up in a heap, the application device can be located directly at the top of this heap or e.g. fastened with a cord over this tip, whereupon the other end is slid down over the side slopes. This is particularly expedient if the application device is in rolled up form and can now be unfolded by rolling it down over this slope.

According to the preferred embodiment, the application device consists of a moisture-permeable, flexible, tear-resistant fabric made of moisture-free, non-hygroscopic and preferably hydrophobic plastic, e.g. a pol] olefin, preferably polypropylene. Because of the high tensile strength of the polypropylene, the fabric can be relatively thin and light.

In the preferred embodiments, the pesticide is pre-packaged in dustproof, moisture-permeable, stretchable bags, particularly the bags described above in the prior art; these bags are then placed in the pockets of the application device. Under these conditions, the material of the application device itself does not have to be dust-tight, since the bag material already prevents pesticide residues from escaping. The application device is preferably made of a thermoplastic material, and the pesticide, which can be prepackaged, for example, in the manner described above, is sealed into the pockets by heat sealing.

The pesticide is usually used in powder form and contains a known auto-ignition inhibitor. In order to largely eliminate the risk of spontaneous combustion, the pesticide is used in small quantities, e.g. 5 to 50 g of metal phosphide, preferably 17 to 35 g of metal phosphide, packaged; in the application device these subsets are not in direct contact with one another.

In the preferred method, one end of the application device becomes detachable, e.g. with the help of a cord, attached to a stationary holder within the space to be fumigated in such a way that the end for removing the application device from this space is easily accessible.

According to certain embodiments, the composition is welded between two plastic layers forming the application device; one of these layers consists of a moisture-permeable, flexible, tear-resistant fabric, the other of a practically moisture-permeable, flexible, tear-resistant film which can be welded to this fabric. The application device is deployed on the surface of the goods to be gassed in such a way that the moisture-permeable layer lies at the bottom.

The method is particularly suitable for gassing bulk goods during transport from the place of loading to the place of destination; the corresponding number of application devices is unrolled after loading and removed again before the goods are unloaded.

The further preferred characteristics of the method and its application result from the subclaims or from the description. To carry out the gassing method, the invention further provides an application device, the hydrolyzable metal phospide pesticide, which releases toxic phosphine on contact with atmospheric moisture, in measured portions, enveloped between two layers of a moisture-permeable covering, with pockets for the portions of the between the two layers Pesticides are formed, which are flexibly connected. According to the invention, the invention is characterized by a tape made of light, tear-resistant, flexible, practically moisture-free, non-hygroscopic plastic, which forms the two layers, of which at least one layer is porous and moisture-permeable, the layers being intimately connected to one another by weld seams and the weld seams and the two layers form a multiplicity of tightly closable pockets for holding the portions of the pesticide, the area between adjoining pockets forming an articulated joint along which the device for rolling up or bellows-like unfolding with the agent contained in the pockets for transport and storage purposes and then for unfolding or unwinding to lay out the device on a surface in the fumigation room and later when rewinding. or folding after the fumigation and removal with the residues of the pesticide without contamination of the goods with the residues.

Certain preferred features of the application device have already been described in connection with the method according to the invention and need not be repeated here. The light, thermoplastic material is preferably a porous fabric made of mutually adhering polyolefin fibers with minimal moisture content, preferably Polypropylene fibers; in addition, this fabric preferably contains longitudinally oriented fibers to improve longitudinal tear strength. The invention relates to an application device, the pockets of which already contain pesticides, preferably prepackaged in the pouches described above, the pockets being closed in order to retain the pesticide therein. After the introduction of the pest control means, which can be located, for example, in the bags mentioned, the pockets are preferably closed by a heat weld seam. According to a modified embodiment of the present invention, only one of the two layers consists of the porous, moisture-permeable plastic described, preferably the fabric described, while the other layer is a practically moisture-impermeable plastic film, which is preferably transparent.

Preferred characteristics of the device also result from the subclaims or the description of the exemplary embodiments.

In the drawings:

Figure 1 is a side view of an application device according to the invention with pouches with pesticides welded therein, partly in a torn view.

Figure 2 is a partial side view of the device with the pocket still open. 3 shows a cross section through the device along line 3-3 in Fig. 1.

4 shows a cross section through the device along line 4-4 in Fig. 1.

Fig. 5 is a partly schematic perspective view of the application of the device on the surface of stored stocks; and

Fig. 6 is a plan view of the wound, bag-filled device in a container.

For the present description it applies that terms such as "top", "bottom", "right", "left", "back", "front", "vertical" and "horizontal" and terms derived therefrom refer to those in the figures 1 and 5 refer to the orientations shown. Of course, the invention can also be used in other orientations, unless the opposite is expressly stated.

With 1 is generally referred to the application device for gassing closed rooms and stored stocks and other goods such as feed, wheat, corn, rye and other types of cereals. It consists of an application device 2 for porous bags 3 with a metal phosphide pesticide of the type which reacts with atmospheric moisture and forms the toxic gas, hydrogen phosphide (phosphine). The device 2 consists essentially of a band 4, made of flexible, porous, non-hygroscopic material. The band forms layers 5 and 6 connected to one another on one longitudinal edge 7 and has a number of seams 8 arranged transversely to the band 4, of which layers 5 and 6 are connected at regular intervals and pockets for Recording of the prepackaged pesticide bag 3 are formed.

The dustproof bags 3 envelop the powdered or pressed body-shaped chemicals of the pesticide directly, and consist of a material that does not react with the agent. In the exemplary embodiment, they are made of crepe paper, and have an approximately square shape with folded edges 13 which outline a pillow-shaped cavity containing the medium.

In the exemplary embodiment, the agent 14 is in the form of a powder,

_/ There are two bags in each pocket 9. The

Outlines of the bags are dimensioned such that a gap remains between them and the outlines of the bags and between adjacent bags for easier insertion of the two bags into the bags.

In the exemplary embodiment, each bag contains 17 or 34 g of powdered agent of the following composition:

70% by weight technical aluminum phosphide

(about 82% AIP, 18% Al ₂ O ₃ ) 26% by weight ammonia and carbon dioxide-forming substances 4% by weight aluminum stearate

The band forming layers 5 and 6 is / almost folded over with a fold 18 forming the longitudinal edge 7 and free longitudinal edges 19 and 20 (FIG. 2) on the opposite side, the free edge 20 being slightly above the other free edge 19 protrudes, forming a tab 21 for closing the pockets. Each of the pockets 9 is preferably oblong transverse to the longitudinal axis of the belt. The pockets are, for example, 3 to 30 cm long and 3 to 15 cm wide and are in large numbers, for example up to 300 pockets in one contiguous row, which corresponds to a total length of several meters and up to 45 m, preferably 3 - 10 m, in particular 4 1/2 m (for example with 50 pockets). Each of the pockets has a closed end 24 on the longitudinal edge 7 of the layers, a pair of parallel side edges 25 formed by seams 8 and an opening side 26 between the free edges 19 and 20 of the layers. The opening side 26 allows the bags 3 to pass through and can be closed by means of the tab 21 so that the bag is secured in the bag. The bags shown are all the same size, and adapted to the shape and large commercial fumigation bags.

The material of the band 4 is non-hygroscopic, i.e. it has practically no moisture absorption and absorption capacity. This avoids the undesired premature outgassing of the agent in the closed storage container by reaction of the agent with moisture. In previous attempts, a hygroscopic material like conventional textile fabrics had been used. This means that the product is not suitable for initial storage due to premature gas development. As a result, the effectiveness of the agent suffers and the product becomes dangerous. When the container is opened, the workers are immediately exposed to the emerging toxic gases. The workers bend over the containers and the toxic gases escape in the immediate vicinity of the workers' mouths and noses. The high phosphine concentrations tend to self-ignite when the cans are opened, and this creates a fire hazard.

According to the invention, the band material is non-hygroscopic. Suitable for this are non-hygroscopic synthetic fibers, for example polyolefins and their copolymers, polyester, mixtures of polyolefin (s) and polyester (s), and modified, non-hygroscopic cellulose material. rial. Polypropylene is particularly suitable because of its particularly low water absorption capacity and other advantageous properties to be mentioned.

Despite its non-hygroscopic properties, the tape material must be porous and so permeable to water vapor and phosphorus hydrogen gas that after the application device 2 has been designed, moisture from the air in the room penetrates into the device, reacts with the agent there, and the gas formed escapes and enters The material penetrates. A light, thin, translucent polypropylene nonwoven with a longitudinally oriented extrusion direction is preferred for increased tear resistance in this direction, so that the device withstands tensile forces.

The polypropylene material may be a fibrous web or a felt-like non-woven fabric made of adherent fibers, as in the present example, in which longitudinally oriented, extruded fibers and shorter, randomly oriented fibers adhering thereto are present. The water absorption and absorption capacity of the polypropylene material is less than 1% by weight, in particular 0.2-0.4%. The material according to the example has, for example, a thickness between 0.08 and 0.25 mm, in particular

Density from 20 to 100 g per m 2, in particular 30 g per mp.

The layers 5 and 6 preferably consist of a fusible, in particular thermoplastic material and the seams 8 are in the form of weld seams (heat-sealed), and at the same time form flexible kinks 28 (FIG. 3) between the pockets. In the exemplary embodiment, the polypropylene layers 5 and 6 are intimately welded by means of parallel weld seams, which are distributed at uniform intervals over the entire length of the material and are continuous across the material from the fold 18 to extend to the free outer edge 20. The seams can be produced using a straight-line heat sealing tool, in particular a hot stamp or the like. According to FIG. 3, the seams each consist of a hot-deformed region 29 of reduced thickness with a depression or groove 30 on one side. The individual pockets can, however, also be spaced from one another, the spacings being formed in each case by a pair of seams and a material strip lying between them, which is only used to connect the successive pockets. With this construction, the strip between the two seams can be cut particularly easily if one wishes to use a length of the device that is shorter than the total length. Finally, it is also possible to specify such predetermined separation areas only at very specific intervals, for example at intervals of. approx. 1 m.

The device 2 may have a holding device at one end, e.g. Hook, tape, cord or similar flexible line 33 (Fig. 5) to facilitate later removal of the device with the degassed pouches contained therein and the residues of the agent. The line 33 is particularly useful when grain is to be fumigated in transport, for example in barges, ships, railroad cars and the like, where the transport-related vibrations and movements can cause the device to sink into the bulk material. The free end of the line is used for attachment to an easily accessible, immovable point on the transport device, e.g. by means of an adhesive strip 35.

To manufacture the device 2, the band 4 is first folded so that the free edge 19 of the upper layer 5 is slightly behind the free edge 20 of the lower layer 6. The strip is then sharply bent at the closed longitudinal edge 7, and the weld seams 8 are attached at regular longitudinal intervals in the form described so that the layers 5 and 6 are intimately connected and the pockets 9 are formed. Two prepacked bags 3, each filled with the powdery agent 14, are then inserted one behind the other in each of the bags 9. The flap 21 is folded around the edge 19 and over the upper layer 5 and intimately connected to the layers by means of a weld seam 38, the open end of all pockets being firmly closed. The device filled with bags is then wound up into an approximately cylindrical body 39 by winding or folding. This is placed in an airtight container 40, preferably a tin can, and hermetically sealed therein for safe and long-term storage and shipping. When the device is folded, the grooves 30 of the fold lines are preferably directed inwards.

In a further development of the exemplary embodiment, when the pockets 9 are closed, weld seams are also provided in the longitudinal direction of the band between the two bags 3 in each pocket. This divides each bag so that the two bags can no longer move over one another.

The two layers 5, 6 of the device according to the invention can also be produced from two initially separate strips. For this purpose, a welding stamp is expediently used, which forms three sides for each pocket, namely two welding seams in the longitudinal direction of the strips and a transverse seam. The means 14 or a bag 3 is then inserted into the pocket which is open in the longitudinal direction. The next time the stamp is used, the already filled bag is closed by means of the next transverse seam and a new bag is formed at the same time. If, as in the example according to FIG. 1, two bags are welded in side by side an E-shaped welding tool is used for this, but should nevertheless be separated from one another by a weld seam. The transverse seam is preferably designed as a double seam so that the device can be cut through between the pockets without opening the pockets. The manufacture of the device from two separate tapes is particularly suitable when one layer 6 is permeable to moisture, ie consists of the plastic fleece, while the other layer consists of a practically impermeable film of a plastic that can be welded to the fleece. Both layers are preferably made of the same plastic, in particular polypropylene. Such an impermeable film can be printed much better than the fleece with trademarks, content labels and instructions for use. Such printing is unnecessary even if the film is transparent and the bag 3 is printed.

For the gassing of a storage space, for example for agricultural products, in the exemplary embodiment of a ship's hold 43, each section of the hold is first loaded to the desired height. The fumigant is packed airtight in the container 40 and brought to the loading space. Only there are the cans 40 opened and the individual application devices laid out flat and completely open on the free surface of the goods.

In the exemplary embodiment, the roller 39 is removed axially from the can 40, placed with the free end 44 down on the item, and secured by means of the line 33 in a position accessible through the loading hatch. The roll 39 is then unwound on the good surface. The number of bags required for the proper fumigation of the goods is determined according to the length and type of the fumigated goods and the shape and volume of the cargo space. Here is primarily the volume of the room, generally without

Consideration of the completeness of the filling, decisive. One uses between one bag per 3 m ³ and one bag per 20 m ³ room volume. The preferred dosage is one sachet (gives 11 g hydrogen phosphide) per 10 m.

If necessary, after the first application device, additional filled devices are laid out in the same way on the crop surface, in a spacer next to one another, as shown in FIG. 5. Because of the prefabricated introduction of the bags into the device and the rolled-up packaging form, a large number of bags can be distributed evenly on the good surface in a very short time without much effort, for which purpose only the roll is carried out in a straight line on the good surface.

To fumigate grain stores, the free end of the roll is simply attached to the storage container 40 and the roll is allowed to roll down the falling mountain of grain under the influence of gravity.

The whole process takes only minutes, whereas the conventional insertion of the loose bags often took several hours.

After laying out the device on the grain or the like, the cargo space is closed airtight. The air humidity enclosed in the loading space penetrates into the device 2 and reacts with the pesticide in the bags. The poisonous hydrogen phosphide gas thus formed diffuses through the property and causes its disinfestation.

After the bags have been completely outgassed and the gas has been allowed to act for a reasonable period of time, the loading space is opened and aired. The degassed bags are now removed from the material by rolling up the device according to the invention either in place or after pulling it out of the loading space in the longitudinal direction from one end to the other or by folding it in a bellows-like manner around the fold lines. In this way, all bags are removed quickly and safely, without the risk of damage, as a result of which pesticide residues from the bags get into the goods and could contaminate them. The wound device is now removed from the storage location and removed for disposal.

When using the device with only one moisture-permeable and one impermeable layer, the permeable layer 6 is turned towards the material downwards. The impermeable layer 5 faces upwards. If the application takes place in an open loading hatch, the impermeable layer 5 protects the agent against any rain until the hatch is closed.

Some of the advantages according to the invention result from the following results:

40,000 bags are required for conventional gassing of a filled grain storage room (20,000 tons) with a volume of 24,000 m ³ and a surface area of 7,000 m. It takes around 400 working hours to introduce them to the grain.

If 100 workers are used for this, and provided that the surface is immediately covered with foils, the concentration of hydrogen phosphide in the work area can rise to up to 1 ppm (parts per million) before the work is finished. Inhaling such concentrations can lead to symptoms of poisoning after just a few hours. If you only use 50 workers, the work takes

/ It is speaking longer and the phosphorus hydrogen concentration in the work area increases to values of up to 30 ppm. Inhaling such concentrations becomes dangerous after only 30 minutes. If you want to enter such a room without serious danger, gas masks must be worn.

At the end of the fumigation period (at least 5 days, preferably 10 days), the work area must first be thoroughly ventilated (6 hours) before workers can enter the room to remove the degassed bags. _. The distance itself takes about 40 working hours, during which the air is by no means completely gas-free.

The design of the required amount of pesticide in the manner according to the invention can be done by 40 workers in a few minutes. The hydrogen phosphide concentration released in this short time is below the limits ascertainable with standard test devices. In storage rooms where a subsequent covering with foil is required, this also happens so quickly with 10 workers that Mac values (of 0.1 ppm) are never exceeded. If the cords attached to the devices are fastened in the vicinity of the hatch opening of the storage room, it is not even necessary to enter the room in order to remove the used means. The devices are simply pulled out, rolled up and removed for disposal.

The downward diffusion of the phosphorus gas into fumigating goods after the devices have been laid out on the surface of the goods is surprisingly quick and effective.

When using

d hl dosage, it only takes about two to three days until in the case of grain pouring: highly effective gas concentrations such as 800 - 1,000 ppm have already penetrated to depths as low as 20 m below the grain surface.

V "_-, '*> / -

Claims

PATENT CLAIMS

Process for fumigation of a closed room and its contents, wherein toxic fumigant gas is developed in the room as a fumigant by the reaction of a hydrolyzable metal phosphide pesticide with atmospheric moisture until the available phosphine content of the agent is practically completely released, the room remaining tightly closed; and the room is only opened thereafter and after an exposure time of the gas of several days in order to remove the residues of the agent, and the pesticide is used in several measured portions, 'encased in a moisture-permeable coating, characterized in that the portions of the By means of pockets which are attached in several, at least partially moisture-permeable, along the length of a band-shaped, moisture-free, non-hygroscopic, flexible, tear-resistant application device, the application device containing the agent is sealed in a coherent, rolled-up or unfolded form in an airtight and moisture-free storage container , from which the application device is removed only immediately before use, after which the application device unfolds or unwinds and, in this state, is preferred in the room containing air humidity as exposed and left in contact with the air humidity and that after the exposure to gas and after opening the room, the application device with the pockets containing the residues of the pesticide is removed as a whole from the room, optionally being rolled up or wound up and removed for disposal becomes. Method according to claim 1, characterized in that the user device is opened and laid out over its full length of several meters over which the pockets are distributed.

A method according to claim 1 or 2, characterized in that a suitable number of application devices for releasing the gas quantity calculated for the room and the goods contained therein is laid out on the exposed surface of the goods, in which position the user devices develops the gas and downwards in All parts of the goods are allowed to diffuse into it.

A method according to claim 3, characterized in that several application devices are laid out at intervals from one another distributed over the surface.

A method according to claim 3 or 4, characterized in that the material as bulk material at a depth of between

2 and 40 m from the good surface is fumigated.

Method according to one of claims 3 to 5, characterized in that grain is fumigated with it.

Method according to one of claims 3 to 6, wherein the material is in the form of a heap-shaped bulk material, characterized in that the application device is attached starting from the upper part of the heap, one end being held in the upper region and the other end being the slope of the heap is allowed to roll down.

Method according to one of claims 1 to 7-, characterized in that the pesticide is encased in a moisture-permeable, flexible, tear-resistant fleece made of practically moisture-free, non-hygroscopic plastic which forms the application device. A method according to claim 8, characterized in that a polyolefin is used as the plastic.

A method according to claim 9, characterized in that a polypropylene is used as the polyolefin.

Method according to one of claims 1 to 10, characterized in that the pesticide is first packaged in dustproof, moisture-permeable, expandable bags, which in turn are filled into the pockets of the application device.

Method according to one of claims 1 to 11, characterized in that a thermoplastic material is used as the material for the application device, and the pesticide is welded into the pockets.

Method according to one of claims 1 to 12, wherein the pesticide is used as a powder containing anti-inflammatory additives, characterized in that the mixture is filled in separate portions of between 5 and 50 g of metal phosphide, and these portions separately and without immediate mutual contact can be accommodated in the application device.

Method according to one of claims 1 to 13, characterized in that one end of the band-shaped device is releasably attached to a fixed point in the fumigation space at an easily accessible location from where the fumigation device can be easily pulled out for later removal from the room. Method according to one of claims 1 to 14, characterized in that the pesticide is welded between two plastic layers forming the application device, one layer of a moisture-permeable, flexible, tear-resistant fleece and the other layer of a practically moisture-impermeable, flexible which can be welded to it , tear-resistant film is formed.

A method according to claims 3 and 15, characterized in that the strip is laid down with the moisture-permeable layer on the material to be gassed.

Method according to one of claims 1 to 16, in particular for the gassing of bulk goods during transport from one place to another, characterized in that after the loading of the goods, the required number of application devices in the loading space is laid out on the surface of the goods, and this in front be deleted after deleting the goods.

Application device for fumigation processes according to claims 1 to 17, by means of a hydrolyzable metal phosphide pesticide which releases toxic phosphine on contact with atmospheric moisture, said phosphine being contained in measured portions, encased between two layers of an at least partially moisture-permeable covering thereof, the between the two layers of pockets are formed for the portions of the pesticide, which are flexibly connected to one another, characterized by a band (4) made of light, tear-resistant, flexible, practically moisture-free, non-hygroscopic plastic, which forms the two layers (5, 6), at least one layer of which is porous and permeable to moisture, the layers being intimately interconnected by welds (8) which are connected and a plurality of tightly closable pockets (9) for receiving the portions of the pesticide (14) is formed by the weld seams and the two layers, the area between adjoining pockets forming an articulated joint (29, 30) along which the application device for rolling up or bellows-like unfolding with the means contained in the bags for transport and storage purposes and then for unfolding or unwinding to lay out the device on a surface in the fumigation space and later again when winding or folding after fumigation and at the removal with the residues of the pesticide can buckle or buckle with the residues without contamination of the goods.

Application device according to claim 18, characterized in that the band (4) has a length of between 3 and 10 m.

Device according to claim 18 or 19, characterized in that one layer (6) consists of porous, moisture-permeable plastic and the other layer (5) consists of practically moisture-impermeable plastic.

Device according to claim 21, characterized in that the moisture-impermeable layer is transparent.

Device according to one of claims 18 to 21, characterized in that the porous layer or layers (5, 6) consist of a porous fleece of adhering polyolefin fibers which have practically no moisture absorption capacity. Device according to Claim 22, characterized in that the fleece consists of polypropylene and contains fibers which are predominantly oriented in the longitudinal direction of the strip.

Device according to one of claims 18 to 24, characterized in that at one end an end of a cord (33) is fastened, the other end is used for fastening and by means of which the device after completion of the gassing with the residues contained in the device Fumigant can be easily pulled out of the fumigation room.

Device according to one of claims 8 to 24, characterized in that the pockets (9) in turn contain bags (3) made of dustproof, moisture-permeable, moisture-free, stretchable material filled with the metal phosphide pesticide (14), and the 'pockets (9) for fixing the bag (3) is closed.

Device according to claim 25, characterized in that the pocket openings are sealed after the insertion of the bags. . Device according to one of claims 18, 19 or 22 to 26, characterized in that both layers (5, 6) consist of a band (4) folded in the longitudinal direction to form the one edge (7), and the one layer (6 ) on the opening side (26) of the pockets protrudes slightly above the other (5), whereby a tab (21) for closing the pockets (9) is formed.

Device according to one of the. Claims 18 to 27, characterized in that they include the pockets filled with the pesticide (3, 4) is folded or wrapped in a moisture-tight container (40).