CN1013775B - Fumigant applicator - Google Patents

Abstract

The present invention relates to a spun-bonded, preferably paper-form polyolefin tufting sheet which is made of polyolefin fine fibers through heat pressing and bonding. Gas and steam can penetrate through the polyolefin tufting sheet, but liquid water and dust can not penetrate through the polyolefin tufting sheet. The present invention has the advantages of natural performance, water prevention, high stretching strength and high tearing strength; the hot welding can be carried out; the polyolefin tufting sheet is used for producing fumigators, and volatile substances are released by controllable speed; the polyolefin tufting sheet can completely protect inner containing substances from being invaded by liquid water. When the polyolefin tufting sheet is used, porous thermoplastic plastic hot welding adhering layers are covered on hot welding sheets, and the melting point of the polyolefin tufting sheet is lower than that of polyolefine fibers, and thus, hot welding weld seams are formed before fiber melting; therefore, the physical property and the gas permeation rate can be basically maintained.

Description

Fumigant applicator

The present invention relates to gas insect protected medium is discharged into device for fumigation in the environment by hydrolyzable insect-proof agent, described device for fumigation comprises one or more pouches of being made by one or more sheet materials that can retain insect-proof agent, bag wall at the bonding formation pouch of coincidence place at sheet material edge, have sheet material porous steam and gas at least, but form the bag wall or the part bag wall of permeate water steam and gas.

Constitute tens such device for fumigation by the pouch of making through the special paper of selecting, these pouches are filled hydrolyzable metal phosphide insect-proof agent, because air moisture content enters pouch and makes the metal phosphide hydrolysis discharge phosphide gas, stifling agricultural product have been used for like a bomb such as cereal one class.These pouches are difficult to existing method manufacturing of making in enormous quantities.

The applicant has developed recently and (has seen US-PS4,597,218; EU-PS0131759) a kind ofly think the steam that retaining of a new generation produced by insect-proof agent or the device for fumigation of gas now, when especially containing hydrolyzable metal phosphide insect-proof agent, when it is exposed in the moisture of environment, because the metal phosphide hydrolysis just discharges phosphine gas in environment.This device for fumigation has adopted the form of pouch, just by the sheet material (some author is referred to as " synthetic tuft ") of the thermoplastic of nonwoven, less bag or the envelope shape pocket made, how much this sheet material is the thermoplastic fiber of arranging arbitrarily if containing, generally the method with heating and pressure sticks together fiber, forms felted or shaggy fabric.Its use can be used with single pouches, also can be a plurality of pouches connect to one smooth, collapsible again composite construction uses, so a kind of long ribbon, when accumulating, come or be converted into the accordion shape, be loaded on airtight and moistureproof container such as in sealing tin with regard to rollable.Before being about to use, this device for fumigation is taken out from gas-tight container, (state the situation of ribbon in the use) then the band of rolling or fold is opened, place environment to be smoked (patent cooperation treaty (PCT) application number WO-A-80/00119).Residue after the metal phosphide hydrolysis stays in device for fumigation with form of powder.This device for fumigation is made with heat weldable method, and the weld seam of formation is used for the side of involution pouch etc., and is forming a folding fold line one by one between the pouch.Under the situation of above-mentioned banded compound fumigation device, clearly, the flexibility of weld seam and physical strength thereof are important, be exactly that this also is very important when making single pouch, because before the final step of making, its method for making is the same with the method for making of composite band (being called " bag cover " in this technology), when this long " bag cover " band is emitted by machine, behind the insect-proof agent of packing into, just be cut into one by one pouch along joint edge.

U.S. Pat-PS4,597,218 have introduced the important improvement to this technology.Yet used plastics synthetic tuft material can not prevent that seldom maybe liquid moisture content from entering inside.In order to prevent entering of liquid water, protect the metal phosphide in these device for fumigation, need to add special additive or take extraordinary precaution to prevent to contact with liquid water.But unexpected this contact is inevitable really, causes the danger of potential fire.

At last, perhaps be most important, although promptly above-mentioned " a new generation " device for fumigation has many desirable performances, but it is defectiveness still, Here it is, the material of this device for fumigation seldom can, can not control speed and its speed that discharges to environment that phosphine gas produces in other words.Such result is exactly, such as near the phosphine gas that the outer surface of device for fumigation, accumulates high concentration sometimes, otherwise, people wish that but these gases will discharge more equably, promptly in environment to be fumigated, pass through diffusion to approach gas, circulation, the speed that convection current or alternate manner scatter discharges gas.The local excess accumulation of phosphine gas when particularly environment temperature is higher, can take place in insect-proof agent being placed environment several leading hour especially.Not only because generally acknowledged now security reason is not wished this gas local accumulation, for the purpose of Pest Control is not wished so yet.Suddenly excessive the concentrating of hydrogen phosphide can make insect lie in a comatose condition, and therefore make insect no longer suck gas, and some insect can recover subsequently again.Therefore, people wish to realize discharging gradually and stably of gas and scatter.But former use and test, the plastics synthetic tuft does not reach or is helpless to provide this to require effect.

Therefore, task of the present invention is to provide the novel device for fumigation of the above-mentioned type, this novel device for fumigation can not only satisfy the requirement that prevents dust and physical strength (particularly preventing to tear), and make liquid water can not access to plant in, the generation speed of control gas insect protected medium and be discharged into the speed that needs in the stifling environment.

Have now found that above-mentioned task of the present invention can be resolved by selecting sheet material, this sheet material is not the former used the sort of sheet material of prior art, but have except other required character, also have and can control the character that water vapour enters the speed of device for fumigation.

Device for fumigation of the present invention is characterised in that, at least one described sheet material is suitable for controlling the speed that water vapour enters device for fumigation, at least one such sheet material of being made by plastics synthetic tuft sheet comprises the irregular netted of the plastic optical fibre that is bonded together through heating and pressurizing, form not saturating basically stress-free water and dust, natural waterproof and high the stretching and the sheet material of tearing strength, be no more than 1000g/m through selecting the back water vapour permeability ²/ 24h.

Now also find,, make it have paper shape outward appearance, can satisfy above-mentioned requirements by the certain newer plastics synthetic tuft material of hot pressing compacting.Plastic material can be different, but normally spunbond polyolefin piece or by the polyolefin fine fibre through the bonding synthetic tuft of making of heating and pressurizing, this sheet material can see through steam and gas, but impenetrable liquid water and dust, natural waterproof and high the stretching and tearing strength.

The polyolefin of polyolefin sheets is polyethylene, particularly high density polyethylene (HDPE) preferably, such as the HDPE of fusing point 135 ℃ of scopes.Yet other polyolefin also can use in principle, such as, polypropylene, high density polyethylene (HDPE) and polyacrylic blend or mixture or polyethylene polypropylene copolymer.

Wherein some special excellent product comes into the market, as the registration mark product of Du Pont de Nemours company commodity TYVEK by name.These a series of robust products are made with 100% hdpe fiber through spunbond process integration.Sheet material is by spinning to such an extent that very thin polyethylene fiber constitutes, and in fact, just in commodity, every fibre diameter is about 0.005 millimeter, these fibers is paved into random netted, with heating and pressure these fibers is bonded together then.In these class commodity, do not use adhesive, slurry or filler.This product can cause different firmness or pliability and pleated performance, and wherein great majority are paper shapes, and different porositys is arranged.Compare with other material, toughness and endurable hitting property are good.The combination property in TENSILE STRENGTH, percentage elongation, tearing strength and life-span is fabulous.The surface can be made smoothly and be closely knit, is suitable for printing, coating or laminated.Product has natural water proofing property, this means that when being dipped in the water, its physical property is unaffected.Product has excellent size stability, anti-corrosion property, mildew resistance and chemical resistance.Fusion takes place at 135 ℃.Compare with the material of many other plastic base, this product has superior noninflammability.Meeting the flame product can shrink, but will burn lentamente and the polymer of the fusion of dripping.Under general service condition, product does not produce the Soft flocks grain usually.This series products of great majority has all carried out effective antistatic treatment when listing.These series products of great majority, particularly closely knit paperlike products has good water retention property, can support to meet and exceed 76 centimetres hydrostatic column cap.These products are recommended to be used for such as making card and label, sign label and sign board, skirting, book envelope, wall extension map, chart, packing and envelope etc.

The tensile strength of selected preferable plastics synthetic tuft material is not less than 4.6N/mm(ASTM D823-60).

Must point out emphatically, narrate in spunbond used according to the present invention its feature of polyolefin sheets and performance and the United States Patent (USP) 4,653,644, the spunbond polyester that is used in what is called " Ropes " aspect has a great difference.The spunbond polyester of there narration had not both had the intensity of sheet material of the present invention, and liquid water and dust are not had barrier yet, and these characteristics are the key characters that are used for the polyolefine material of most of purposes that this specification narrates according to the present invention.Spunbond polyester sheet does not possess the performance of this requirement of permeability of restriction gas and steam yet.According to the present invention, this performance can be used to control the gas that device for fumigation of the present invention discharges or the speed of steam, this point further narration below.

Because with a large amount of ventilative synthetic resin sheet materials; comprise that the synthetic tuft sheet has carried out the test in many years; be surprised to find that very much; the sheet material of this specific type has the ability of protection metal phosphide; and can regulate the rate of release of hydrogen phosphide with mode described here and degree; by former experience, some is that prior art is beyond one's reach.In order to make device for fumigation, this polyolefin piece has excellent performance and promptly liquid water is had tangible obstructing capacity.Therefore; the present invention accomplishes to make the device for fumigation such as insect-proof agent pouch that contain metal phosphide for the first time; this be fully since the water resistance of polyolefin piece every usefulness, just causes under regular service conditions and the very condition of appearance when accident is used under protect the not influence of liquid body water of metal phosphide fully.This is very important from the angle of safety, because if there is not this kind protective effect, the metal phosphide component can spontaneous combustion take place owing to contacting with the accident of liquid water.For example, owing to the humidity of cereal to be fumigated or other agricultural product, roof leaking improper owing to covering or that the storage device leakage causes all can cause this situation.Aspect selecting, the impressionability of sheet material and antistatic behaviour also are important performance, the particularly latter, and it can reduce potential explosion danger and help some printing form.Now the sheet material that can accomplish has good smoothness, is in fact again an advantage.Also having an advantage is that this sheet material combustibility is very low.Be difficult to make it to ignite, even and the burning also burn very slowly.

If the present invention is adopted; just can realize a general target according to the device for fumigation of top definite each side so; promptly give insect-proof agent; the insect-proof agent that is based on metal phosphide specifically proposes a kind of good protection means to liquid water; even if do not add normally used protection composition; and this device for fumigation can be to retain the residue of insect-proof agent and used insect-proof agent than the former more reliable mode that can reach, even they are very thin powder.Have, this device for fumigation has been realized a new target again, can regulate the product of volatile content or these contents (as pH in predetermined mode ₃) speed that discharges to environment.

In the middle of all these, may the most important thing is to be surprised to find that,, under actual service conditions, be significantly less than the best-case in the prior art of former existence on the surface of device for fumigation or near the phosphine gas concentration of surface.In this respect, be proved to be will an order of magnitude for novel device for fumigation.This improvement is neither neither the estimating of expection.

Scope of the present invention may extend into beyond the foregoing device for fumigation, has both contained in the pouch of this device for fumigation such as with aluminum phosphate, magnesium phosphide, calcium phosphide or wherein several metal phosphide insect protected preparation, preferably aluminum phosphate and magnesium phosphide.

Have again, for the first time can in device for fumigation, use now in these phosphides any one and fully without any additives, particularly need not be commonly used to prevent the sort of additive of aqueous water.Very it should be noted that now even can use industrial magnesium phosphide, this is the high material of a kind of activity, even its some commercially available device for fumigation of packing into, is difficult to also generally prevent that it from contacting with liquid water and spontaneous combustion takes place.

Like this, the present invention just expand to insect-proof agent be with aluminum phosphate, magnesium phosphide, calcium phosphide or wherein several be some object lessons of base-material.

According to selecting polyolefin piece for reaching desirable desired gas of aerogenesis speed and vapour transmission rate.Like this, just can control hydrogen phosphide aerogenesis speed by the decision of sheet material moisture vapor transmission.In addition, can be fully no matter how the relative humidity of stifling environment accomplish this point.Therefore, select porosity even become also have a crucial factor than temperature because, control moisture content enters device for fumigation speed from environment moisture vapor transmission to the interdependent degree of temperature not as so high to the interdependence of porosity.

So just can produce the device for fumigation that designs with different predetermined speed release hydrogen phosphide as requested,, and wish in other cases to discharge slowly because wishing to discharge hydrogen phosphide faster in some cases.

Only as an example, the moisture vapour transmission rate is (with gram/rice ²Expression in 24 hours) can be for example change 1000 from about 50, the one end is the device for fumigation that designs for slow release gas very, and the other end comparatively fast designs for outgas.

Moisture vapor transmission is to be more suitable for general situation from about 300-1000, and is the stifling purpose that great majority are generally wished, we will select the material of moisture vapor transmission 500-750, such as 600-630.Its nominal weight of typical this polyolefin film materials (promptly before the use adhesion layer) is (with gram/rice ²Expression) be 30-150, the more general 50-120 that is about typically is about 60-90, such as 75.

The another kind of control method that restriction gas discharges is that restriction places the air-permeable surface of the sheet material that the per unit component is had in the device for fumigation long-pending.This can be by accomplishing such as following method:

When a) making device for fumigation, a part is used by sheet material of the present invention (such as in a side), remainder then uses with it different but compatible sheet material, and this sheet material has only very low or fully sees through gas or see through the permeability of steam, such as with little close thermoplastic paper tinsel.

B) topped with the very low or complete air-locked overcoat of air penetrability on predetermined part area on the gas permeability surface.

Outgas speed will be inversely proportional to the surface area through gas and steam.

Steam smoked device and preferably adopt the welding method manufacturing.Above-mentioned best synthetic tuft material should handled, more it should be noted that when particularly adopting the conventional equipment that is similar to welding packing thermoplastic film otherwise in the commissure or near the intensity it will reduce.Have now found that the performance of fiber will be destroyed so if applying enough heat and pressure makes it to realize satisfied bonding.It is transparent and crisp that weld seam becomes, and pouch just breaks easily, and metal phosphide will be emitted poisonous component or Powdered catabolite.

Also once did some trials and try hard to be coated with one deck adhesive by the side at flaky material, the EVAc (EVA) that is lower than sheet material such as fusing point or fusion range solves this problem.But a series of samples by different coatings or lamination process manufacturing all do not meet the demands, because in these cases, though can successfully carry out hot weld, have lost the transmitance of the phosphine gas of needed water vapour and release.

But the solution of this problem can be adopted the hot weld thermoplasticity adhesion layer of the topped one deck porous in whole surface on the heat weldable side of synthetic tuft material require at least, the fusing point or the fusion range of this adhesion layer are more much lower than polyamide fiber, make and using common hot pressing welding, just form weld seam in the past at the fusing point that reaches fiber, therefore just kept the physical property of polyamide fiber substantially.

The fusing point between polyamide fiber and the adhesion layer or the difference of fusion range should be greater than 20 ℃, for example between 30-80 ℃, especially between 40-70 ℃, at some in the example about 50-60 ℃ preferably.

The gas of adhesion layer and moisture content permeability basically should be than the high orders of magnitude of polyolefin sheets (promptly more than 10 times or 10 times), especially when such adhesion layer will be covered with whole surface.Such sheet material manufacturing is simple, easy to use, because at this moment need not to weld in the predetermined footprint of sheet material, so utilize the topped sheet material in full surface more welcome.On the other hand, should be realized that,, will save the material that forms the hot weld adhesion layer if adhesion layer is only limited in the zone that will form weld seam.If gas permeability becomes order of magnitude ground to surpass polyolefin piece, the gas permeability of so whole sheet material will depend primarily on the latter, and adhesion layer will not have big effect.

The gas permeability of adhesion layer depends on two factors:

A) thickness of adhesion layer shows with the attachment material scale on the per surface area,

B) method of application of hot weld adhesion layer, this factor is a particular importance.

The applicant once attempted in all sorts of ways and realized target of the present invention, but did not all have successfully.For example, attempt to reach the set goal (at this moment being to select EVA for use), yet necessary vapour transmission property has been lost as attachment material at sheet material upper strata unification layer EVA paper tinsel (although being very thin one deck).

On the other hand, have been found that, make it then to be melted on this surface, thereby obtain the method for high porosity, can successfully obtain adhesion layer by powdery attachment material spreading is opened.

For example, can directly be spread in powder on the polyolefin sheets, under the temperature of fusing point that is lower than the sheet material fiber or fusion range, make it fusion then.Although the fusing point difference between polyamide fiber and the attachment material is smaller,, accurately controls temperature again and can accomplish this point such as by the sheet material that spreads powder is had suitable length and the careful heat tunnel of controlling temperature through one.

A kind of preferable methods is the method that is called transfer coated method in this area, promptly be earlier attaching powder to be spread on the interim area supported, on this, carry out the fused layer of fusion formation porous, this porous layer transfer and attached on the polyolefin sheets, keep its porosity simultaneously substantially then.

The appropriate amount that has been found that the coating material that forms adhesion layer is about 10-50 gram/rice ², especially at 15-40 gram/rice ²Between, and be preferably 15-30 gram/rice ²Have been found that 30 gram/rice ²The EVA attachment material can provide the result who feels quite pleased.Yet, also find, even 20 gram/rice ²Also very enough.

The adhesion layer material of selecting for use is compatible with polyolefin sheets, in order that make the sheet material can hot weld, at first be that self can hot weld, and preferably also can carry out hot weld with other bondedfibre fabric paper tinsel or film, these bondedfibre fabrics are by being polyethylene, polypropylene and their copolymer such as polyolefin, and the mixture of polyester or two kinds and multiple above-mentioned substance is made.EVA just can meet this requirement well, and it is a kind of good attachment material, and the fusion range of reasonable grade is about 75-80 ℃, and the fusing point of polyolefin sheets fiber is about 135 ℃.

Though yet-so not good-can use the polyolefin adhesion layer yet, such as polyethylene, no matter the high density low-density preferably has fusing point same as described above, and promptly the fusing point as fruit fiber is 135 ℃, and the fusion range of adhesion layer is preferably 80-85 ℃.Test shows to have the polyamide of required fusing point or fusion range or the suitable admixture of the polyester and the material of giving an example and also can use, but do not recommend now.

If wish that just in these parts that will weld, any method of being narrated in the so available United States Patent (USP) 4,597,218 is accomplished this point at the zone use adhesion layer of the qualification of sheet material.

Owing to provide another embodiment the problems referred to above also will not exist, promptly provide a kind of and can retain the device for fumigation that discharges steam or gas by insecticide or another material, this insecticide is included at least by two sheet materials, connect together in the pouch that constitutes by the hot weld weld seam, pouch promptly is used for holding and will disengages steam or disengage the material of gas, a slice wherein is by spunbond, preferably the polyolefin piece of paper shape or synthetic tuft sheet constitute, ventilative and the saturating steam of this paper shape sheet or suede sheet but impenetrable liquid water and dust, waterproof and have high the stretching and tearing strength natively, by thin polyamide fiber through heat, overlay to close and form, another sheet is by welding mutually with the former, and its fusing point or fusion range are lower as to be enough to make the former with the latter welded together and thermoplastic foil or film that do not damage the latter constitute binder couse that need not be special when hot weld than spunbond polyolefin sheets.Basically or relatively saturating usually steam of another paillon foil or gas.If the fusing point of airtight paper tinsel or fusion range are more much lower than spunbond polyamide fiber, even do not use the special knitting layer just can be together two kinds of material hot welds.And airtight paper tinsel itself just plays a part knitting layer, such device for fumigation can be defined as and comprise the two-layer at least sheet material that is connected together by heat weldable weld seam, they have constituted the one or more pouches that contain the material of released vapour or gas, one deck is made up of the spunbond polyolefin sheets of a class, but as what when speaking of the hot weld plastic sheet, define and narrate, another layer is by suitable can forming with thermoplastic foil and film that the former welds mutually, and its fusing point or fusion range are more much lower than spunbond polyolefin sheets, and hot weld is together and don't the damage latter basically to make the former and the latter.The content of relevant device for fumigation can be used for other situation with similar method herein.

The content of device for fumigation need not be pulverous.They can be graininess or compacts, such as piller or small pieces.In the latter case, device for fumigation can be used as United States Patent (USP) 4,653, the good remodeling of the device of being narrated in 644, this device is called as " Ropes " in this area, at this moment, is bordering on spherical piller and is enclosed in individually in the cup-shaped pouch of being made by non-woven fibre sheet (synthetic tuft sheet).In the test of reality, this " Ropes " exposed shortcoming, their dust that can shed.But if use hot weld sheet material of the present invention will produce much better product.

Scope of the present invention also expands to commodity, building, packing device, transporting equipment and provides a kind of sterilization method such as vehicle, cabin or cask, promptly discharge hydrogen phosphide to these places, and in the required effective time of sterilizing, keep hydrogen phosphide that the concentration of insecticidal effect is arranged by above-mentioned device for fumigation.This aspect of the present invention also can be considered as protecting above-mentioned extensive stock and facility to make it not to be damaged, or improves a kind of method of its service property (quality).

Device for fumigation of the present invention can be made multiple change, and the pouch or the bag shell-like bag of various ways for example can be provided.

To further explain the present invention with concrete example below, but should note, the invention is not restricted to these examples, and these examples should understand together with aforesaid more generally disclosure, and these disclosures will make the professional who is familiar with present technique implement the present invention in the gamut of claims.

In the accompanying drawings:

But Fig. 1 represents to be suitable for to make the partial cross section schematic diagram of the weld tabs material of device for fumigation of the present invention;

Fig. 2 represents the sectional view by the fumigant device for fumigation of the present invention of sheet material manufacturing shown in Figure 1;

Fig. 3 represents the plane of a device for fumigation with less ratio, and it along the section part of II-II line as shown in Figure 2;

Fig. 4 represents pack into the vertical view of receiver (lid removes) of another the many bagging apparatus form of implementation of the present invention as the fumigant device for fumigation;

Fig. 5 represents the side view of a kind of example in the process of pulling out of many bags of bands of the present invention from packing with less ratio;

Fig. 6 represents the gas release profiles that common paper bag and pouch of the present invention obtain, and every kind all contains 11.32 grams and is suitable for producing PH ₃Technical grade aluminum phosphate;

Other different instances sectional view similar to Fig. 2 of Fig. 7 to 11 expression fumigant device for fumigation of the present invention, in Fig. 7,8 and 10, a part is to be made by sheet material shown in Figure 1.These all are depicted as a single pouch, but they can be many bags form, just can be referring to Fig. 2,3,4 and 5 represented many more completely bagging apparatus.

Figure 12 and Figure 13 represent facing and side view of banded device for fumigation bottom of the present invention respectively;

Figure 14 represents the schematic cross-section with the parallel plane banded device for fumigation mid portion of Figure 12;

Figure 15 and 16 the facing and side view of top of expression and Figure 12 banded device for fumigation similar respectively with 13.

Be appreciated that the present invention though be familiar with the professional of present technique by being described in detail of front, be regardless of the accompanying drawing of ratio, mainly narrated their feature with figure below with reference to these.Following narration should come together to understand in conjunction with the details of narrating previously.

Now at first referring to Fig. 1,1 is the cross section of sheet material in the drawings, this sheet material be thoroughly steam, be anhydrous bondedfibre fabric basically, it is a kind of spunbond paper shape polyolefin piece, by heating of polyolefin fine fibre and pressurization pressing are formed, but it can not be by liquid water and dust when seeing through steam and gas, and is natural waterproof and higher stretching and tearing strength are arranged.Explanation for example supposes that these products all are that Du Pont de Nemours company or its agent make and sell, and its registration mark is TYVEK, and model is 1073D.

The quality of this material is approximately 75 gram/rice ², about 200 microns of thickness, the nominal value of moisture infiltration capacity (MVT) is 614 gram/rice ²24 hours.Elmendorf (Elmendorf) method tear strength is 545/500 gram forward/laterally (pressing ASTM D 689-62).Its TENSILE STRENGTH is the 7.5/8.8 kg/cm ²Forward/laterally (press ASTM D 828-60), elongation at break are 26/32% forward/horizontal (pressing DIN 53857).Air transmission coefficient is that 23sec(is by Gurley Hill).Non-pressurized liquid water will can not permeate by this sheet material.Its surface is bright and clean.The thickness of single fiber is 0.005 millimeter, and its fusing point is about 135 ℃.

Be attached with porous cover layer 2 on sheet material 1, its rough surface is that 75～80 ℃ EVA constitutes by fusing point, and average use amount is about 30 gram/rice ²Make with so-called transfer coated lid method, this method is elder generation's spreading EVA powder on a provisional carrier, makes it the molten mass that fusion becomes one deck porous then, when it also is molten state it is shifted and fits on the polyolefin sheets, at this moment its porosity is guaranteed substantially.The surface that list of illustrations reveals this overcoat is coarse, also show, powder particle only is molten to such degree, be that they also do not merge fully, but formed the hillock of horrida cutis shape one by one, then be some perforates 3 basically between the hillock, just the side at sheet material has the EVA coating, and the ambassador of its porosity does not influence the gas and the vapour transmission rate of sheet material in fact on the border.

Referring now to Fig. 2,, this is a cross section in a plurality of pouches, and its cross section is by two sheets 1 ' and 1 " forms, they are equivalent to 1 among Fig. 1, all are coated with EVA2 in a side of each sheet material, the coat side opposite placement of two sheet materials.

Fig. 3 more specifically demonstrates this two sheets 1,2 by hot weld together, this is a plan view, hot weld along the longitudinal weld seam 3,4 and 5 and cross weld 6 carry out, so just formed the parallel cryptomere pouch 7 of two row, load weighted aluminum phosphate or magnesium phosphide powder all are housed in every bag, wherein can have additive also can not add.Weld seam 3 and 5 has constituted the both sides of this strap means, and longitudinal seam 4 longitudinally occupy middle.Weld line utilizes plastic sheeting to pack the used machine of commodity continuously to carry out hot weld and form.This hot weld is to carry out being enough to cause the EVA fusion and don't can causing under the temperature and pressure of fiber fusing of sheet material 1(1 ', 1 "), and hot weld makes two sheet materials be bonded together fully along weld seam, as shown in Figure 2.Can be referring to USP 4,597,218 as for the insect-proof agent of being adorned in each cavity 78, USP 4,215,508, PCT application number WO-A-80/00119(be equivalent to ZA-PS 79/2263) and the explanation of the corresponding patent of many other countries.But it should be noted that, the reason of having said owing to the front, can save the additive in the metal phosphide component now fully, additive-free or non-additive substantially metal phosphide powder of the use in generation or particle are technical grade magnesium phosphide or aluminum phosphate (meaning of doing like this is on record in Pesticidal technology) particularly.Yet; the most handy a small amount of water-repelling agent comes the impregnating metal phosphide by known method own; such as with 1～5%; 3% solid paraffin or specifically at US-PS 4,421 specifically, 742 and US-PS 4; 600; disclosed organo-silicon compound in 589 are particularly because in the manufacturing process that product is sealed before becoming device for fumigation, this has protective effect.The quantity of metal phosphide is chosen such that the amount that is equipped with in every bag should be able to provide 5 to 15 grams available (that is to say and can emit) hydrogen phosphide, and it is standard values that the aluminum phosphate composition in the pouch can disengage 11.32 gram hydrogen phosphide.

Can cut single pouch along line of cut 9 according to people's wish, this line is by the central authorities of weld seam that single cavity 7 is separated from each other.Just made single pouch in this way, can be packaged in them individually or by predetermined quantity and be used in the airtight container storing and transportation.With such method, up to unpacking pouch taken out and to be used as before the fumigant device for fumigation uses, can avoid steam to enter metal phosphide.

Yet, shown in Fig. 3,4 and 5, device for fumigation of the present invention also can be the band shape of predetermined length, comprises two parallel row in the example that illustrates, pouch is connected to each other in every row, such as 100 pouches rolled or fold up before using and are stored in the gas-tight container.

Referring to Fig. 5, this is the side view of a plurality of pouches shown in Fig. 2 and 3.Zone 10 expression horizontal position welding seams 6, this seam the pouch that insect-proof agent is housed one by one separately.The last item is above the solid more anti-again part of tearing aperture 15 to be arranged in these weld seams, just can fix device for fumigation such as putting on a marline in the above.By people's wish, hole 15 can be strengthened with metal or plastics buttonhole.Many bags bands are folded up as accordion be packaged in the airtight container 16.The broken line of concertina be and single pouches between cross weld 10 match.In Fig. 5, container 16 is openings in 18 these sides, by this mouthful, shows along the arrow direction and is pulling out device for fumigation.

Now, referring to Fig. 4, what illustrate here 19 is another example of many bags of strap means, it is equivalent to weld seam 6 in Fig. 2 and 3 by many (such as 100) single pouch 20 by weld seam 10() interconnect, constituted a continuous ribbon, it is rolled-up and be contained in the air-tightness receiver 21.One end of this band also is fixed with the line that fraps as shown in Figure 5.

In test, confirmed that novel device for fumigation is so solid and dustproof fully, so that eliminated any for practical purpose even seldom measure the risk that poisonous dust enters environment (such as grain or the food handled with fumigant).Therefore, device for fumigation of the present invention (pouch or band) now can be directly and responsive food, contact such as flour, oatmeal, infant foods, dry fruit, nut and tobacco etc., and need not be as prior art need be by means of paper bag, cardboard or similar quarantine measures.Accident is lost the motion (storing or transportation such as adjourn) that pouch in commodity also is not easy owing to commodity very much and is split, and this happens occasionally when using the paper bag of prior art.

The biogas production characteristics of pouch of the present invention (Fig. 3) and common paper bag biogas production characteristics relatively be shown in Fig. 6.The general industry level aluminum phosphate that uses need not anyly make its biogas production characteristics affected method handle.Used common 70%(weight) technical grade phosphorization aluminium powder and 30%(weight) inert fraction.(0.5 meter of airtight experimental rig ³) in, under 70% relative humidity and 20 ℃, carry out the test of pouch.

It will be appreciated that the tolerance that produces from pouch of the present invention is well-proportioned, was according to almost being that linear relation is carried out in the past at the 7th day, produced PH at the 7th day ₃Material consumption light.

See Fig. 7 and Fig. 8 of accompanying drawing now, a side of every kind of pouch also is by constituting as the sheet material of being narrated among Fig. 1 in both cases, and the numerical chracter here is identical with the meaning of Fig. 1, and an other side of pouch then is to be made of different sheet materials.These two edges along pouch are welded together at 6 places.Under the situation of Fig. 7, this different sheet material 31 is a kind of air-locked substantially materials, such as, it can be polyolefin-aluminum composite foil, also can be air-locked substantially multilayer complex films that polyethylene and more air-locked basically synthetic resin (as Vingon PVDC) constitute.Like this, allow moisture content to enter to be equipped with the bag chamber 7(of powdery or granular metal phosphide composition to represent by the pouch of Fig. 7 by many points 8) speed to be about as much as both sides all be half of the steam penetration speed of being permitted by the bag that same sheet 1,2,3 constitutes.Therefore, in this case, just correspondingly produce and discharge phosphine gas with half the speed that is equivalent to the described pouch of Fig. 2.

Again especially referring to Fig. 8, second sheet material 1 here ' ' ' also be to constitute by the spunbond paper shape polyolefin piece identical with ground floor, just it does not have porous cover layer 3.Sheet 1 ' ' ' on what replace it is a part 32, this is a kind of fine and close overcoat of being made up of fusion EVA, is used on practical purpose preventing that steam from penetrating from this part.This means penetrating of steam be limited in the surface area of sheet 1 and the 2nd last 1 ' ' ' not covered portion 33 on, this causes the aerogenesis speed of hydrogen phosphide to be proportional to the admission velocity of steam.

Referring now to Fig. 9,, one side of the pouch that illustrates here is by constituting as 1 among Fig. 8 ' ' ', but there is not topped porous layer 2,3, and opposite side to be sheet material 31 by fine and close basically airtight also waterproof vapour constitute, along the weld seam as Fig. 7 and 8 as shown in 6 and sheet 1 ' ' ' hot weld constitutes bag chamber 7 that insect-proof agent 8 is housed together.With sheet 1 ' ' ' fusion range of that side of relative sheet material 31 to be lower than at least sheet material 1 ' ' ' fusing point of fiber, be enough to make can carry out hot weld and don't make sheet 1 ' ' ' the polyamide fiber fusion.The another kind of selection, promptly available such as the part use suitable molten adhere layer of the way of narrating among the Figure 11 of back before carrying out hot weld at weld seam 6.It is similar to the speed of pouch described in Fig. 7 basically with the speed that produces hydrogen phosphide that steam enters insect-proof agent 8.

Referring now to Figure 10, this is Fig. 7,8 and the another remodeling of the example of 9 pouches of being narrated.In this case, a side 31 of pouch also is to be made of the sheet material 31 of airtight also waterproof vapour basically.An opposite side part also is by the sheet material bar 31 of airtight also waterproof vapour ' constitute, two 31 ' between be gap 34, this gap is covered by the ventilative also silver 35 of vapor pervious, this silver is to be made of as shown in fig. 1 sheet material 1,2,3.This silver 35 by hot weld in bar 31 ' the edge, weld is a lap.Similar to all examples of front, the edge of pouch is in the hot weld of 6 places.If bar 31 ' can by hot weld on bar 35, then need not attachment material 2, so just can save adhesion layer 2,3 itself.Another selection way: attachment material also can be only limited to lap.In this example, entering of steam is limited to 34 these parts basically, controlled by the transmitance of this part material 1,2,3.Therefore, the size of 34 this part area has just been controlled insect-proof agent 8 and is produced phosphine gas and it is discharged into speed in the environment to be fumigated.According to the change that can in all sorts of ways of the example of Figure 10.Silver 35 is placed on need not image pattern like that symmetrically, can for one of independent one 31 ' and independent one 35, this while has just replaced second 31 ".Can also bar 31 ' along weld seam 6 be soldered on the sheet 31 or the edge break of sheet 31 get up to form bar 31 '.

Referring now to Figure 11,, what illustrate here is that the present invention can be for the another example selected for use, in this example, the both sides of pouch all be by the not topped spunbond polyolefin piece 1 used as example among Fig. 9 ' ' ' constitute.Yet under this situation, the weld zone that is about to form edge weld has the adhesive layer 36 of EVA, its fusing point to be lower than basically layer 1 ' ' ' fusing point of fiber.On the right side of Figure 11, adhesive layer 36 fuses together at 6 places, and in the left side, and two adhesive layers are about to press the compacted and hot weld of the direction of arrow 37 indications together.

As in the example of all fronts, in this example, the also available Powdered or granular metal phosphorizing compositions in bag chamber 7 is filled.Yet this example and all examples of narrating previously also can be used to other purpose.In the illustrated case, the common camphor ball such as naphthalene system is equipped with in bag chamber 7.Such pouch is used for protecting such as treating that mothproof textiles makes it not take place directly to contact with naphthalene.Pouch is also controlled naphthalene and is discharged into speed in the environment.In this example and the pouch at aforementioned all examples, camphor ball 38 also can be contained the different cultivars of emitting volatile insect-proof agent gradually and be replaced.Yet the purposes of these examples is not limited to insect-pest.The material that also can contain air freshener or release spices.In addition, absorption can be housed in the pouch from environment or absorb the material of gas or steam, such as drier or a kind of absorbent or else be used for making the unlikely generation infringement of phosphine gas of still emitting too early at the hydrogen phosphide insect-proof agent of packing.This based composition itself is known, need not to describe in detail.

Now specifically have a look Figure 12 to 16 of accompanying drawing again, what illustrate here is the instantiation of banded device for fumigation of the present invention,, uses this high-tensile strength sheet material with special effective method here.A kind of remodeling of the example that this is among Fig. 2 to 5 to be narrated, it can also be retrofited with the whole bag of tricks of being narrated among Fig. 7 to 11, though do not recommend so.Compare with Fig. 2 and Fig. 3, one of main difference is, the device of this band shape is to be connected together by the coupling part of softness and constituted by many pouches, but this be with narrow, also by from beginning to end, but have only row's pouch to form, single pouch is narrow, by the part that constitutes connection than two short limits, and the long both sides and side 39 overlaids of device for fumigation.This be because, do not prepare to be tiled on the bearing-surface or go up on the commodity top of piling up or in the neighbourhood with the whole strap means shown in 40, the example of Figure 12 to 16 is with other method, promptly with a long rod it is inserted into the depths as far as possible from commodity (as the cereal) top of piling up.

Past attempts attempts to adopt the synthetic tuff sheet material that proposes in the aforesaid prior art to make this class device for fumigation, but not very successful, and reason is that the tearing strength of synthetic tuff sheet material is not enough, is in sometimes even also that pouch has just split in the packing container.In addition, the material of prior art is more coarse, and when attempt was inserted into it cereal and similarly piles up the commodity depths, frictional force was bigger.These problems are all by the invention solves.In typical example, the length with 40 is 3080 millimeters.With 40 basically by the material of being narrated among two-layer Fig. 1 40 ' and 40 " constitute; longitudinal seam 46 ' and 46 39 vertically weld; cross weld 44 and 44 ' being with 40 to be separated into totally 22 (in exemplary) pouches 47 along the edge, 44 and 44 ' between have such as about 5 mm clearance 45.

In representative instance, weld seam is wide 8 millimeters, and the overall width of band is 70 millimeters, and the length that comprises each pouch of weld seam is 140 millimeters.The pouch at two ends is empty, and remaining then is equipped with insect-proof agent, and each will be packed into composition 25 grams of narration in the example 1 below in exemplary.

In the bottom (seeing Figure 12 and 13) of band, terminal empty pouch is folding at 41 places, forms a ring, loads onto the solid handle 42 of a steel in ring.The solid buttonhole 43 of ring 41 usefulness is sealed up.Another kind of way also can be welded with weld bonds layer as proposed by the present invention, but this is just so not good.

On the top (seeing Figure 15 and 16) of band, a circle 49 is arranged in 48 districts, this is a solid plastic fabric, be inserted into the two sheets 40 on empty bag of the top of opening ' and 40 " between, securely it is fixed on suitable position between two-layer with another buttonhole 50.Also can use the method (but not so good) of welding.

With the same method described in Fig. 4 whole device is rolled in the such receiver of the receiver that is sealed among Fig. 4 21.In fact, several (such as 4) strap means receiver of packing into can be arranged, this receiver is sealed makes it airtight and waterproof vapour, in order to storage and transportation.In addition, this strap means also can be folded into the accordion shape and packs by the method described in Fig. 5.

Actual tests shows because sheet material 40 ', 40 " smooth surface, and the intensity of band is big, can arrive band downward vertically among the insertion cereal with rod, and whole bands are all inserted.One end hook of rod is on handle 42.So just improved distribution of gas situation, even the height of heap is very high, such as the situation in cabin at the cereal vertical direction.Ring 49 is used for device for fumigation being pulled out after stifling finishing.For this device, the practical dose ratio is 0.7～28 gram PH ₃/ ton cereal (i.e. 1 band/6～238 ton) is preferably 3～11 gram/tons (i.e. 1 band/15～55 ton), and more specifically the person is about 4 and restrains PH ₃/ ton (i.e. 1 band/42 ton), each band contains about 500 gram medicaments here, can produce about 167 and restrain PH ₃

Example 1

In pouch as described in Figure 2, each is equipped with the standard aluminum phosphate insect protected powder mixtures of 34 grams, mixture consist of 70% industrial aluminum phosphate, 18.5% urea, the aluminum stearate of 7.5% ammonium phosphate and the mixture of sodium carbonate (1: 1) and 4%.

The size of each pouch is about 100 * 90 millimeters.

In order to compare, made the little paper bag that size similar (100 * 80 millimeters) contains the prior art of the identical aluminum phosphate composition of same quantity, in addition, be of a size of the composition that 100 * 90 millimeters polyester synthetic tuft pouch (similarly also being according to prior art) contains same composing quantity.

At volume is 0.5 meter ³The experiment air chamber in these pouches of test, the saucer that is filled with water is housed in the chamber keeps humidity and constant temperature at 20 ℃.

Survey phosphine concentration in the later air chamber of different time.From following table 1, can see the result.

The residual content of aluminum phosphate is as follows after the off-test:

Aluminum phosphate residual volume in the little paper bag is 3.4%, and polyester synthetic tuft pouch is 3.2%, and pouch of the present invention is 2.6%.Pouch of the present invention can make to decompose and carry out to such an extent that more complete this advantage is observed constantly.The reason that causes this excellent final result still is unknown, and this is a unexpected advantages of the present invention.

To see that also outwards the speed of emission gases is milder from pouch of the present invention, for the purpose of the insect-pest of reality also be wish such.

Example 2

" bag cover " the shape bag of making according to Fig. 2 and be used for fumigating the granary that includes 700 tons of wheats together by the bag shell-like bag of prior art polyester synthetic tuft manufacturing.Below table 2 be illustrated in the typical phosphine concentration that different fumigation times records, measurement of concetration carries out at Liang Chu, a place is directly and the bag part that contacts, a place is 8 centimeters above the bag shell-like bag in cereal.Cereal per ton use the insect-proof agent that can produce 27 gram hydrogen phosphide (2.5 bags per ton, each

Aluminum phosphate mixture in the 34 gram examples 1 is housed, totally 18 bag shell-like bags in the bag).This is the most general dosage ratio in some countries.About 20 centimetres cereal on bag shell-like bag upper cover.All cover with air-locked plastic film on cereal heap surface.

Following table reflects that the hydrogen phosphide release of device for fumigation of the present invention is quite to relax, and this is just avoided on the surface of bag shell-like bag or excessive near the concentration of surface, and the phosphine gas distribution in whole cereal is much also even.

Table 2

PH ₃Concentration (ppm)

Time in the cereal of bag shell-like bag surface above the bag shell-like bag 8 lis

Rice

Tyvek prior art Tyvek prior art

5h 17500 30000 800 11400

24h 15000 33000 1200 3300

48h 6000 13500 600 6000

72h 3300 15000 500 7500

5days 1200 2550 100 1350

6days 550 1140 100 880

Example 3

Make and tested three kinds of pouches as shown in Figure 10.Pouch is of a size of 100 * 90 millimeters, the sheet material that silver 35 adopts as shown in fig. 1, and sheet 35 has following each size:

A) 1 * 9 centimetre,

B) 2 * 9 centimetres,

C) 3 * 9 centimetres.

The industrial magnesium phosphide that 24 grams soaked with 3% solid paraffin is housed in each pouch.Under the following conditions pouch is exposed in the humid air.The air chamber volume is 0.5 meter ³The water dish that is filled with water is housed to guarantee that having enough humidity, air to remain on constant temperature is under 20 ℃ in the air chamber.It is 153000ppm that the amount of magnesium phosphide is enough to decomposing the back final gas concentration of generation fully.Yet, stopped test later at 144 hours.By finding out the speed that in air chamber, discharges hydrogen phosphide in the table 3.

Table 3

3 centimetres of silvers of 2 centimetres of silvers of time 1 centimetre of silver

(hour) (ppm) (ppm) (ppm)

1 5 7，5 8 10

2 9 18 20 25

4 15 30 30 50

6 25 50 60 100

24 150 400 500 800

48 450 600 800 1200

72 600 900 1200 1800

144 2000 3900 4200 6500

Can see that the release of gas roughly is proportional to the area of ventilative silver.

Example 4

The paper bag of pouch of the present invention as described in Figure 2, the prior art sewed up with Sewing machines and prior art polyester synthetic tuft pouch (size of all pouches is all the same) the industrial magnesium phosphide that 24 grams flood as water-repelling agent with 3% solid paraffin of respectively packing into.

Pouch carries out following test to determine its security performance when the improper use:

1. water drip test

Two pouches of per sample (p.s.) are put into the tank (200 * 150 * 50 millimeters) that a sheet metal is made, and it is overlapping making them that half be arranged.In 1 hour with on bag, drip 70 ℃ water (one of per second) of dropping funel.At temperature is to carry out this test under 35 ℃.

2. water spray test

Such metal film trap that pouch is housed in the service test 1.On pouch, spray 10 ml waters with spray bottle, on pouch, sprayed 10 ml waters later on again, repeated like this to amount to 1 hour in 15 minutes.

3. receiver test

3 pouches are placed in 2 liters the receiver, pour 100 milliliters 70 ℃ water into and make and do not have pouch, keep this receiver and reach 4 hours.

4. soak test

Single pouch is put into a metal stamper, pour on the bag water make the water surface do not have at least the bag on 5 millimeters.Water kept 4 hours in the plate.

5. submerging test

In 800 milliliters beaker, add entry.The pouch of test usefulness was soaked in water 5～10 seconds, take out then and get rid of water, after this pouch was placed 4 hours.

6. powder test

15 gram mixture of powders are joined in 150 milliliters of cone-shaped glass flasks.Heat this flask with 50 ℃ air bath.When temperature reaches 35 ℃, add 5 ml waters with dropper.Flask was placed 1 hour.

Not having under the damaged condition, except pouch of the present invention, all the other all spontaneous combustions of all pouches.In powder test, the generation of positive according to expectation spontaneous combustion.

Example 5

Stifling as in Example 2 cereal, but the temperature-averaging when stifling wants high 10 ℃, and also the dosage that uses is than being cereal 68 gram compositions per ton.In a test, use the bag shell-like bag of the present invention as in the example 2.Use common bag shell-like bag in contrast test, composition wraps into earlier in the little paper bag, littler paper bag is packed in bag shell-like bag.

The pH that records at cereal place from 15 centimetres of bag shell-like bag distances ₃Concentration (ppm) sees Table 4.

Can also see, control quite steadily that this shows that to keep distribution of gas to get at one section in for a long time quite even in cereal according to the hydrogen phosphide that the present invention produces.

Example 6

Make comparisons with the physical property of prior art

The moisture vapour transmission rate of synthetic tuft sheet of the present invention is selected 300-1000 gram/rice for use ²24 hours persons, preferably 500-750 gram/rice ²24 hours.The moisture vapour transmission rate of the spunbond polyolefin synthetic tuft of the technical grade of Shi Yonging sheet is 614～694 gram/rice the most ²24 hours, (approximate rounding was 600 to 700 gram/rice ²24 hours).This moisture vapour transmission rate rank with EVA overcoat 20～40 micron thickness, can not be subjected to tangible influence as spreading yet.The material of proof prior art in the past, its best moisture vapour transmission rate will surpass one times more than, that is:

Paper pouch: 1270 gram/rice ²/ 24 hours

Wet polyester synthetic tuft sheet: 1251 gram/rice ²/ 24 hours

Wet polyolefin synthetic tuft sheet: 1260 gram/rice ²/ 24 hours

The industrial polyolefin synthetic tuft material that is suitable for, when thickness is 0.14 to 0.25 millimeter (mean value), the tearing strength of its all directions except one, surpasses 5 Ns/millimeter all between 4.6 to 11.6 Ns/millimeter.This just with the 4.1 Ns/millimeter of tearing strength of the best paper bag of prior art, and the tearing strength of the synthetic tuft sheet of above-mentioned prior art is that 2 to 2.5 Ns/millimeter has had difference clearly.

The what is more important motion tearing strength of advancing is compared with prior art, surpasses spunbond polyolefin synthetic tuft sheet widely.

Here Fu Dai claims will be regarded a part of this disclosure as.

Table 4

5h 24h 48h 77h 92h 168h

Tyvek bag shell-like bag: 2,400 12,000 12,000 12,000 15,000 1800

The bag of common paper bag

The shell-like bag

6000 18600 24000 21000 15900 1100

Claims (27)

1, by hydrolyzable insect-proof agent gas insect protected medium is discharged into device for fumigation in the environment, described device for fumigation comprises one or more pouches of being made by one or more sheet materials that can retain insect-proof agent, bag wall at the bonding formation pouch of coincidence place at sheet material edge, has sheet material porous steam and gas at least, but form the bag wall or the part bag wall of permeate water steam and gas, it is characterized in that at least one described sheet material is suitable for controlling the speed that water vapour enters device for fumigation, at least a such sheet material of being made by plastics synthetic tuft sheet comprises the irregular netted of the plastic optical fibre that is bonded together through heating and pressurizing, form not saturating basically stress-free water and dust, the sheet material of natural waterproof and high stretching and tearing strength is no more than 1000g/m through selecting the back water vapour permeability ²/ 24h.

2,, it is characterized in that pouch contains hydrolyzable metal phosphide insect-proof agent according to the device for fumigation of claim 1.

3, according to the device of claim 1 or 2, it is characterized in that the synthetic tuft material be spunbond polyolefin piece or by the polyolefin fine fibre through the bonding synthetic tuft of making of heating and pressurizing, this sheet material can see through steam and gas but not see through liquid water and dust, and is natural waterproof and has high the stretching and tearing strength.

4, according to the device for fumigation of claim 3, wherein plastics synthetic tuft material is the spunbond synthetic tuft of paper shape, and has the TENSILE STRENGTH (ASTM D823.60) that is not less than 4.6N/mm.

5, according to each described device for fumigation of claim 1 to 4, the water vapour permeability that it is characterized in that the synthetic tuft material is 50-1000g/m ²/ 24h.

6, according to each described device for fumigation of claim 1 to 4, the moisture content transmitance that it is characterized in that synthetic tuft is 300-1000g/m ²/ 24h.

7, according to each described device for fumigation of claim 1 to 4, the water vapour permeability that it is characterized in that synthetic tuft or polyolefin sheets is 500-750g/m ²/ 24h.

8, according to the device for fumigation of claim 1 or 2, it is characterized in that only the part surface of pouch bag wall has aforesaid water vapour permeability, all the other basically can not permeate water steam.

9, device for fumigation according to Claim 8, but the surface area that it is characterized in that the permeate water steam that occupied is limited with different but compatible remainders with sheet material of the very little transmitance that maybe can not see through gas and water vapour by part synthetic tuft material being made the wall that limits as claim 1, but the restriction of the surface area of the permeate water steam that is occupied also can be limited by the very little or impervious overcoat of topped transmitance on the predetermined portions of the surface area of vapor permeable.

10,, it is characterized in that on the one side of described synthetic tuft material or its part, making a bag wall according to the device for fumigation of claim 9.

11, according to the device for fumigation of claim 9 or 10, it is characterized in that having the very little or impervious compatible sheet material of gas and water vapour permeability is fine and close thermoplasticity thin foil.

12, according to claim 1, the described device for fumigation of each of 2 or 8, it is characterized in that it comprises that at least two sheet materials are combined together to form one or more pouches through the hot weld weld seam, a sheet material is the spunbond paper shape polyolefin synthetic tuft of being made through heat pressure adhesive by the polyolefin fine fibre, this synthetic tuft has that aforesaid energy sees through steam and gas and impenetrable liquid water and dust, natural waterproof also has high the stretching and tearing strength, another sheet by can with the former welding and its fusing point or fusion range than spunbond polyolefin piece low be enough to welded together and don't damage suitable the thermoplasticity thin foil or the film of the latter and adhesion layer that need not be other the former with the latter.

13,, it is characterized in that being the form of single pouches according to each described device for fumigation of claim 1 to 4.

14, according to each described device for fumigation of claim 1 to 4, it is characterized in that being a bag shell-like bag form.

15, according to the device for fumigation of claim 1 or 2, it is characterized in that, synthetic tuft is the polyolefin synthetic tuft of making from 100% hdpe fiber with spunbond process integration, this technology spins very thin polyethylene fiber, in fact its diameter is about 0.005 millimeter, then its random alignment is reticulated, heating and pressurizing sticks together fiber again.

16,, it is characterized in that the fusing point of polyolefin synthetic tuft or fusion range are in 135 ℃ scope according to the device for fumigation of claim 15.

17, according to each described device for fumigation of claim 1 to 4, it is characterized in that being strap means, comprise many a plurality of pouches that connect together through soft coupling part end to end, one end of band is folded up and is fixedly become a ring, be equipped with above and draw button, can be used to band is inserted in the product of accumulation, the opposite end of band after having a ring to be used for pulls out band.

18, according to each described device for fumigation of claim 1 to 3, it is characterized in that synthetic tuft is at least on certain area and at the thermoplasticity hot weld adhesion layer for the treatment of the topped one deck porous of a heat weldable side, base fusing point or fusion range are more much lower than synthetic tuft fiber, make that being connected on this fiber by common thermocompression bonding just forms weld seam before reaching fusing point, thereby keep the physical property of fiber basically.

19, according to the device for fumigation of claim 18, it is characterized in that, a whole side of synthetic tuft topped the adhesion layer in many holes is arranged, wherein the gas of adhesion layer and moisture content transmitance are higher more than 10 times or 10 times than polyolefin piece.

According to claim 18 or 19 described device for fumigation, it is characterized in that 20, the fusing point between fiber and the adhesion layer or the difference of fusion range are greater than 20 ℃.

21, according to the device for fumigation of claim 18 or 19, wherein difference is 30-80 ℃.

According to the device for fumigation of claim 18, it is characterized in that 22,, apply adhesion layer and be that this material of fusion makes and stays many holes on this surface then by pulverous attachment material being sprinkling upon on the bearing-surface.

23,, it is characterized in that powder directly is spread on the synthetic tuft fusion under the temperature of fusing point that is lower than this sheet fiber or fusion range then according to the device for fumigation of claim 22.

24,, it is characterized in that adhesion layer is to apply by transfer coated method according to the device for fumigation of claim 20.

25, according to the device for fumigation of claim 18, the amount that it is characterized in that adhesion layer is a 10-50 gram/rice ²

26, according to the device for fumigation of claim 18, wherein the material of adhesion layer is ethylene vinyl acetate or polyethylene.

According to the device for fumigation of claim 2, it is characterized in that 27, insect-proof agent is based on aluminum phosphate, magnesium phosphide, calcium phosphide or more than one medicament wherein.

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