CN1071636A

CN1071636A - Seal package

Info

Publication number: CN1071636A
Application number: CN92111694A
Authority: CN
Inventors: D·B·爱德华兹; W·J·麦卡西
Original assignee: Rhone Poulenc Agriculture Ltd
Current assignee: Bayer Agriculture Ltd
Priority date: 1991-10-16
Filing date: 1992-10-16
Publication date: 1993-05-05
Anticipated expiration: 2007-10-16
Also published as: AU2783692A; EG19530A; NZ244732A; GB9121984D0; MA22678A1; ZA928012B; TW226321B; MX9205918A; IL103426A; AP9200437A0; WO1993008091A3; ATE149131T1; DE69217665D1; CN1030831C; EP0607316A1; WO1993008091A2; BR9206762A; IL103426A0; PT100971A; AP374A

Abstract

A kind of airtight package comprises the exterior not rupture seal mouth that has by single or multiple lift flexible polymer sheet material sealing-in one-tenth, an in-to-in rupturable seal mouth, and have certain space between inside and outside seal.The peel strength of rupturable seal mouth is lower than rupture seal mouth not.Packing can be made by water miscible or water dispersible and material, and the user need not to take out content and can directly it be mixed with water.This packing is suitable for the dressing composition pesticide especially.

Description

Seal package

The present invention relates to a kind of packing that is particularly suited for the dressing composition pesticide.

Agricultural chemicals, for example herbicide usually is extremely harmful material, and usually it is produced certain coned sol or the dispersed system in organic liquor, certain gel or solid-state.The mode of representative these chemical of supply is with a metal or blow moulded plastic container.When using chemical pesticide such as herbicide, measure earlier a certain amount of high concentration agricultural chemical from container, then be sprayed onto need on the place of handling or the plant before, itself and a large amount of water are mixed.The material of this class high concentration usually has very strong toxicity, thus measure and mixed process in, must very carefully prevent to spill, be in direct contact with it to avoid the human or animal.

The someone has made to make great efforts in a large number design containers, reducing the danger that the container contents accident spills, and reduces with the resistates in the container of back.Plastic container have been used so that topple over its content with wide-mouth.Made the blow moulded plastic container with hollow handle, remained in wherein for avoiding material, these handles are isolated with container body.

Yet in the process of mixing, the current packaging ratio is easier to spill content, has to cause environmental pollution and the danger that contacts the human or animal.And, peasant and other users container of seldom turning comparatively speaking, and tend to half-full container is kept.This means further danger.Even after using up all contents, also be difficult for the disposal of empty receptacle.Simultaneously fully to handle the measuring device of high depth agricultural chemicals also be difficult for washing container and being used to.These utensils mean further danger to human and environment.

The someone proposes agricultural chemicals are packaged in the container, is screwed into one on a respective accessory of spraying on the case by a spiral accessory.Have only when in case and container, having under the desirable sealing-in situation, the content in the container could be injected.Consider that this need be with spiral accessory dimensional standardization, and if the good leak proof sealing-in of out of reach the possibility of leakage is just arranged, guarantee that then being extensive use of this system just exists practical difficulty.

Also have the people to propose chemical is packaged in the water miscible container, just at it with after water contacts, content just discharges.Yet this application is owing to the performance that is normally soft and that easily break of known water soluble container is restricted.Special when this packing is fallen, if wherein dressing be liquid, gel or thin powder because impact machinery or waterpower is packed and is broken especially easily.

Use the field of flexible packaging at other, need equally to reduce owing to physical shock causes the possibility of breaking.

The object of the invention is to overcome the shortcoming of existing packing, and a kind of flexible packaging that has through improved anti-physical shock performance is provided.

Therefore the invention provides a kind of airtight package, it comprises the exterior seal that does not break that the soft polymer sheet sealing-in of one to multiple layer becomes, the rupturable seal of in-to-in, and between inside and outside seal, have certain space.

When packing stands physical shock, rupturable seal can break, and has disperseed the energy of vibrations, thereby can not damage exterior seal.This packing is included, a space is arranged between the outer gland sealing mouth, and preferably this space does not contain the content in the packing: if the in-to-in seal is broken through, content will enter this extra volume, and helps to disperse to impact.

The seal that used meeting is broken in packing is broken through when the physical shock meeting that the height that stand from 1 to 2 meter falls.The peeling off or in seal, form the gap rupturable seal is broken of sealing-in.

Packing of the present invention comprises one to multiple layer flexible material, is preferably thermoformable material, and sealing-in forms an airtight package.As adopt multi-layer sheet, preferably they are identical materials, but also can be different.Preferably the sheet material sealing-in by two layers of separation forms an airtight package.

Described according to a specific embodiment, the sheet material of packing used one deck or every layer is water miscible or water-dispersible.Use this class material can bring one or more following advantage, especially when content contains certain dangerous pharmaceutical chemicals, agricultural chemicals for example:

The content of this packing only with just can obtain after water contacts discharging, and be dissolved in water or be dispersed in wherein the possibility that this material that has just reduced not diluted contacts with environment or human or animal's accident;

Content can be made unit dosage form, be convenient to water dilution, and no longer need undiluted content is measured with scheduled volume;

This packing is easy to use: only need place it in simply in the water before use;

No longer need the residue chemistry material in the clean container to carry out their safe disposal, the container that contacts with content does not tarnish, and this offers convenience with regard to the disposal for them.

The concrete material of suitable water-soluble or water dispersible comprises polyvinyl alcohol, polyethylene oxide; Alkyl and hydroxy alkyl cellulose, as CMC, hydroxyethylcellulose, hydroxypropyl cellulose, carboxymethyl cellulose; Polyvinylether is as poly-ethylene methacrylic ether or poly-(2-methoxy or ethoxy ethene); Poly-(2,4-dimethyl-6-triazine radical ethene); Poly-(morpholinyl ethene); Poly-(N-1,2,4-trisazo-(triazonyl) ethene); Poly-(vinyl sulfonic acid); Polyanhydrides; Low-molecular-weight urea formaldehyde resin; Low-molecular-weight mole amino formaldehyde resin; Poly-(2-ethylol methacrylate); Polyacrylic acid and homologue thereof.Preferable material has polyethylene oxide, methylcellulose, or polyvinyl alcohol, and optimum is polyvinyl alcohol.Usually, the polyvinyl alcohol of use is the polyvinyl acetate film of partially or completely alcoholysis or hydrolysis.

Most preferredly be to use a kind of thermoformablely as Vinex, polyvinyl alcohol resin: this resinoid has and can adopt deep-draw molded and can not produce the advantage of the problem of significant contraction.

Material can be non-orientation, uniaxial orientation or biaxial orientation.Water-soluble material is owing to not producing handling problems thereby being preferred.The material of generally selecting for use is a cold water solubles; The polyvinyl alcohol of cold water solubles is most preferred.As the dissolving of this packing of needs be dispersed in water or heat mouthful in, or do not need it water-soluble or aqueous dispersion, can select other material for use.

At the sheet material of forming this packing is under the situation of water miscible or water dispersible property, and the maximum strength of this sheet material preferably is not less than 20, more preferably is 30-80N/nm ², and breaking elongation is preferably 200-380%, more preferably 200-350%.The mensuration of these numerical value is generally carried out under 23 ℃ and relative temperature are 50% condition.

Packing of the present invention is water-soluble or water dispersible, is preferably in and discharges its content in 10 minutes fully.Usually this packing is put in the sprinkling groove of atomizing cone commonly used.After having injected the water of part in the general groove, add this packing again.When being furnished with mixing device in groove, the content in the packing then can discharge quickly.Best this being released in 1 minute is as just taking place in second at 30-40.Be appreciated that to discharge the required time of agricultural chemicals, also depend on the many factors except that bag character, as water temperature and stirring extent.

This packing can dressing be the material of liquid, gel or particle form.When content is liquid or gel form, prevent to seem especially important because of the leakage of the content that causes of aperture on the packing.In this case once or every synusia material can adopt lamination, it adopts two layers of identical or different material usually, because the aperture in two layer materials may not be certain and can coincide.

When content is under the situation of particle, and general sheet material uses a monolayer material.Yet, under the situation of the aperture that need avoid especially packing,, can use above-mentioned multilayer material as for disagreeable smell is overflowed.

The one general thickness of sheet material of forming packing is 20-500 μ m, is preferably 50-250 μ m.As this or these sheet materials is water miscible or the material of water dispersible, can satisfy under the situation that prevents breakage of packing and sheet material will remained on final thin thickness, is beneficial to water-soluble or water-dispersible material can be dissolved or disperse as soon as possible, and discharges content.

As described in a specific embodiment, the rupturable seal in one or more inside is set at the easiest position of falling damage of packing.Pack the easiest position of falling damage according to many factors and different, these factors comprise content, the size of shape and packing, the storage of packing and usage condition etc., this can be measured by normal experiment.

As described in a specific embodiment, packing by an inner sealing mouth and one have than inner sealing mouth more the outside seal mouth of high-tear strength constitute.Self can have the zone of different peel strengths the inner sealing mouth, seals the zone typically and has lower peel strength, perhaps can have uniform peel strength.Inside and outside seal can be associated in and form a continuous seal mouth with different peel strengths together, maybe they can be separated a spacer segment.

Cannot be with a plurality of, typically available nearly 4 inner sealing mouth, and they have the low peel strength of this outside seal and separate certain intervals separately, wherein preferably do not contain the packing content.Under the situation that has a plurality of inner rupturable seal mouths, peel strength can be identical or different.Peel strength as seal changes, and the representative type situation is that the peel strength of innermost rupturable seal mouth is minimum, outmost the highest so, and middle is then medium, and intensity increases progressively to the outermost seal successively.

Such packing, contents such as the liquid of packing into, gel or particle through physical shock, can cause the part of inner sealing mouth to be peeled off, thereby absorb vibration energy thereby can not damage the outside seal mouth.

Inside and outside seal can be heat sealing.The general available traditional heat-sealing mouth of outside seal mouth, thickness is 2-5mm.Common one or the thickness that seals of each internal heat be 1-10mm, as 2-5mm.

Make inside and outside seal with the identical pressing plate that seals, generally the interval between each inner sealing mouth and outside seal mouth is no more than 20mm.For example can have 1-3 internal heat to seal, each 2-3mm is thick, between them or and the outside seal mouth between be spaced apart 2-3mm.

Another kind of way uses different with the outside seal mouth pressing plates that seal to make one or each inner sealing mouth, and inside and outside such seal can be got very and open, as long as do not contain the packing content between them.For example seal the packaged unit that content is housed, and around the handle part of packing, seal into the outside seal mouth with one or more inner sealing mouths.

Except with heat-sealing mouthful, the adhesives sealing-in can be used in arbitrary or each inner peelable seals mouth or outside not peelable seals mouth.Can use polymer adhesive commonly used; Bond strength can be adjusted to strippable and not peelable seal on demand.When packing be water miscible or the situation of water dispersible under, suitable bonding comprises a spot of water, or low-molecular-weight poly-vinyl alcohol solution, can be mixed into polyvinyl acetate arbitrarily.

Packing of the present invention comprises one or more strippable seals and not peelable seal, and they can form dual or multi-sealed mouthful around whole packing.Yet when other situations, those that one or more inner sealing mouths only can be used to pack are subjected to the position that mechanical shock is damaged especially easily, to strengthen the outside seal mouth.At this moment the inside and outside seal can be bound up and enter space between seal with the content that prevents to pack.

Another kind method, available one or more inner peelable seals mouths are separated into one or more unit with packing, and preferably each unit volume is identical, and each unit accommodating section is divided the packing content.When packing suffered physical shock, one or more inside peelable seals mouths can be thrown off, and it is long-pending that this has increased packing content, made that the energy that impacts obtains disperseing and unlikely damage outside seal mouth.

Described by another embodiment, packing of the present invention can comprise an exterior not rupture seal mouth and an in-to-in rupturable seal mouth, the latter can be by turning up a part without any the packing of content, very weak then adhesives is bonded at the packing outside face.This weak bonding feasible packing can be disperseed suffered mechanical shock and be made the mounted package of turning up; The content of packing then can enter before by the folding part branch, and the space between sealing outward, has so just prevented the infringement to outside seal.The adhesives of outside seal mouth and use can be identical with above-mentioned type.

By the another embodiment of this invention, packing can comprise an outside seal mouth that does not break and a connection sheet of putting together with the rupturable seal mouth.Mechanical shock to packing can make the rupturable seal mouth open and make the connection sheet expansion, thereby for the content of meeting motion provides more space, to disperse to impact the infringement that prevents outside seal.For example, the part of packing can be formed connection sheet to invagination, produce a rupturable seal mouth by a weak adhesives at the outside face of this part.Used outside seal mouth can be identical with the above-mentioned type with adhesives.

Described by the 3rd embodiment, packing of the present invention can be made up of an outside seal mouth that does not break and one or more inner sealing mouth, narrow gap is arranged in the inner sealing mouth or between the inner sealing mouth, this is forming additional space between the inner sealing mouth or between inside and outside seal, and the content of packing is not contained in this space in fact.Can enter inside and outside the space between seal by the packing content to the mechanical shock of packing obtains disperseing.For example packing can comprise an inner sealing mouth that a narrow crack is arranged, or a pair of seal of overlapping with narrow crack, and when packing during by upright placement the usually, these gaps are not accommodate in packing in content that part of.Can use the seal of type same as described above: can be used in combination and can not peel off and the peelable seals mouth, but the seal that general use is not peeled off.

The content of packing can be liquid, and gel or graininess are preferably liquid state or gel.When content was liquid state, they can be solution or a dispersed system such as emulsion or suspension.Same when for gel, they can be single-phase gels or a dispersed system.

Under the situation that packing is made up of the material of water miscible or water dispersible, then content will be dry substantially.Content can contain any carrier commonly used, diluent or inhibiter.

When content is liquid or gel, and when containing organic solvent, then require the material of water miscible or water dispersible to be insoluble in this organic solvent.

When the content component was graininess, packing of the present invention generally can be held 0.1g-7kg, is preferably 1g-5kg.When content is liquid state or gel, then can hold 5ml-10l usually, be preferably 50ml-5l.

General this packing should leave the space that is not filled on a small quantity at least, as is at least 5% of volume, to reduce the possibility that spills at this package production content.When packing suffered physical shock, the packing content can enter the space that this does not fill up, and has disperseed impact energy.

In one embodiment, but packing of the present invention can the dressing composition pesticide.This combination can be a common type.

The agricultural chemicals that can use packing of the present invention comprises fungicide, insecticide and herbicide (for example hydroxy-benzyl nitrile herbicide, as Brominal or sulphur benzene nitrile or derivatives thereof such as salt or ester, as its heptanoate or caprylate).Invertebrate poison (molluscicides) for example is suitable for adding in pond or the brook, also can use this packing.

More widely, but packing dressing of the present invention have potential toxicity or damaging or be harmful to the pharmaceutical chemicals of health or environment.Except that agricultural chemicals, comprise that also those dissolve in or be dispersed in the pharmaceutical chemicals in the big water gaging or the aqueous system, be used for service water solution corrosion-proof cmpd, as 2-methyl-5-nitro-1-imidazole radicals-ethanol, or be used to add the cmpd of the water-circulating of family expenses or industrial heating system, be used to add swimming pool, photo supplies, ink (printing ink), dyestuff, those cmpds in non-water organic acid and the gluing additive.

When the material of wrapper was polyvinyl alcohol, content generally can not contain certain a certain amount of borate, and chloride or chlorate are to avoid causing the destruction to material, unless they are to its zero damage.

When content is a liquid, can comprise with the oil being the solvent of matrix with appropriate organic solvent as carrier, as ligroin, mineral oil, fat or aromatic hydrocarbon such as hexane, octane, cyclohexane, benzene, dimethylbenzene and naphthalene, halo fat or aromatic hydrocarbon such as carbon tetrachloride, chloroform, methylene chloride and chlorobenzene, ester class such as banana oil, ketone such as cyclohexanone, ethers, or higher alcohol (lower alcohol gas oozes out from the material of above-mentioned water miscible or water dispersible, and this can cause content to ooze out outside packing).Be appreciated that the miscellany of mixed solvent such as hydrocarbon solvent and another kind of solvent such as ketone or higher alcohol, can use too.If packing is water miscible or the organic acid of water dispersible must be quite dry, contain than representative type and be less than 2-3% moisture, can from packing, not spill prematurely to guarantee it.

This composite can comprise inhibiter, come to replenish or sometimes replace organic solvent as carrier or diluent.Best, this inhibiter is quite dry, and aqueous ingredients is less than 2-3%.Suitable inhibiter can be ionic or nonionic: as sulphorici-noleates, quaternary ammonium derivative, condensation product based on epoxyethane and alkyl and polyaryl phenol such as nonyl or octyl phenol class, or through making the free hydroxyl etherificate and the sorbitan carboxylic ester of the solubility that becomes with ethylene oxide condensation, the sulfate of alkalies or alkaline earth and sulphonic acid ester such as dinonyl and dioctyl-sodium sulphonyl succinate, alkalies and alkali salt such as lignin sulfonic acid sodium salt and calcium salt and alkyl benzene sulphonate sodium salt and calcium salt with the sulfonic acid of high molecular weight.

Can contain nearly 10% in the content, as 0.05-10%, inhibiter, but its content also can be higher if desired, for example in the outstanding concentrate of fluid milk up to 15%, can be in water miscible concentrate up to 25%.

The content of packing can be stiff or be rendered as thixotropy gel.The increase of content viscosity can reduce to stand mechanical shock and cause the possibility of breaking when packing.Can make the content of packing become more more tacky or the thixotropy increase by adding additive, as modifiedorganophile or bentonite, lecithin, polyoxymethylene (polymethylene oxide) or silica gel.

The concentration that is dissolved or dispersed in organic liquid or pharmaceutical chemicals in gel such as agricultural chemicals is generally the concentration of using routinely.But, concentration can be improved in order to reduce each packaging size.The volume that best each packing is held is at least 500ml, is preferably to hold a convenient orthobaric volume of using, as 500ml-18l, though can select any convenient orthobaric volume of using for use.

When content was graininess, when using the packing of water miscible or water dispersible, any conventional carrier that uses or diluent were quite dry, and its aqueous ingredients will be lower than 2-3%.Suitable solid diluent or carrier have aluminium silicate, talcum, (calcining) magnesium oxide, diatom earth, calcium phosphate, cork dust, adsorbent carbon black and clay such as kaolin and bentonite.Solid-state composition can comprise inhibiter, as the dispersing agent of having addressed before those.These inhibiters also can be used as diluent or carrier in some cases.

Identical with fluid composition, the concentration of pharmaceutical chemicals can be the concentration of using routinely as the concentration of agricultural chemicals in solid-state composition: for reducing packing measurement, can improve the concentration of solution.

Be contained in content such as composition pesticide in the present invention's packing, can prepare according to a conventional method.

At first form the uncovered storage of a suitable splendid attire content, content is packed into wherein, seal then, just can obtain packing of the present invention.

Uncovered storage can obtain with conventional approach.For example, the method that utilize to form vacuum obtains, and material is configured as storage according to the shape of a suitable mould, and as needs, the method for available heat moulding makes sheet material keep the shape of mould after the demoulding.

When vacuum forming, mould can be fixed with pin hole, the space between mould and the sheet material can be evacuated by these apertures.

When Heat forming, with forming vacuum sheet material is leaned against on the mould, or pressurize, or make the moulding of sheet material mobile plunger with mechanical device at the another side of sheet material.

After forming uncovered storage, content is packed in the packing, storage sealing is formed a close unit.The sealing-in step can comprise will packing two faces be enclosed in together, the sheet material of material is converted into a storage, then with its sealing or with another sheet material uncovered storage is sealed again.Be preferably in before wherein adorning content, this uncovered storage is earlier partially enclosed.

System can be made or be sealed respectively in the inside rupturable seal mouth of packing and outside not rupture seal mouth simultaneously.Before the filling packing, at least two kinds are sealed and can partly make.Two kinds are sealed available heat-sealing or make with adhesives is bonding as previously mentioned.

With the heat sealing method sealed package time, available common heat-sealing equipment carries out under habitual condition.Can control envelope pincers temperature, parameters such as clamp pressure and length of the halt are to obtain the heat-sealing mouth an of the best.In order to guarantee best processing characteristics, be under the situation about being made by the material of water miscible or water dispersible in packing especially, heat-sealing generally should record at relative humidity 18-85%(18-22 ℃) under carry out.Preferred relative humidity is 35-55%.For obtaining a suitable seal, this is relevant with the material of making packing, then needs to do some normal tests, as concrete grade and the thickness of selected PVOH.The quality of seal can be checked with for example estimating opaque area or bubble.The defective of seal can cause the reduction of the desired water-soluble or water dispersible of seal.

Described by a specific embodiment, inner strippable seal can be made with identical heat-sealing pressing plate simultaneously with the outside seal of not peeling off.At this moment, can change the intensity of the heat-sealing mouth that is produced by Change Example as the envelope pincers temperature of heat-sealing pressing plate.On the in-to-in sealing surface, can clamp temperature with low slightly envelope, form a strippable seal: the available stepped appearance of different Sealing pliers temperature seals clamp and obtains, and it has one more to have higher temperature near first sealing surface of heater element thereby than second sealing surface.Another kind can use into clamp and seal clamp without stepped appearance, and exists the space between inside and outside sealing-in surface, corresponding to the space between sealing.Equally, the available clamp that seals with more than two sealing surfaces is made the packing that contains more than one inside rupturable seal mouth.

Remove the above and seal the method that the clamp temperature changes peel strength, also can change peel strength by the method that changes Sealing pliers clamping force or length of the halt by change.

The stepped appearance Sealing pliers can be united use with a plane elasticity material elements.Obtain the seal of varying strength by the different clamp pressure that seal the clamp generation.

Now by graphic mode packing of the present invention is described, in the accompanying drawings: the figure I is illustrated in the mould (2) and with Heat forming or vacuum forming water-soluble sheet material (1) formation is packed, and composition pesticide (3) just is contained in the groove of such formation.Go up second water-soluble sheet material (4) heat-sealing on first sheet material at the flange (5) of mould (2).The heat-sealing comprise exterior be difficult for breaking seal (6) and inside rupturable sealing (7).

The figure II represents to have the packing of handle (8).This packing is equipped with for example liquid (9) of 1 to 5 liter of amount.The heat-sealing mouth comprises an exterior not rupture seal mouth (10) and an in-to-in rupturable seal mouth (11), also can comprise an additional rupturable seal mouth (12) at container bottom.Rupturable seal mouth (11) has different peel strengths with (12).Handle can have a sealing oral region (13) that does not break.

The figure III is represented two kinds of layouts of sealing clamp, utilizes it to seal the different peel strength of horizontal generation in the edge by use different clamp pressure in the process of sealing.Clamp (14) is sealed on elastomeric plane of figure III (a) expression, it is heated, with a stair-stepping clamp (15) that seals that does not heat, its part sealing surface (16) is far away from clamp (14) from clamp (14) nearer and a part of (17).In operation not being both owing to 14 produce of clamp pressure with distance X+Y of 16 distance X and 14 and 17 different, but to remember that clamp (14) understands resilience after being close to.Cause sealing if on the clamp that does not heat, have a plurality of steps and have multiple peel strength, then better.Figure III (b) is represented another kind of structure, and the surface some (18) of sealing of the clamp that does not wherein heat is parallel to the heating clamp, and another part (19) departs from the sloping with the heating clamp, thereby has produced the continuous variation of clamp pressure.Clamp (14) can be resilient.

The figure IV is represented the structure of two kinds of heat-sealing mouthful clamps, can be used for by produce different peel strengths along cross-section clamp temperature traverse of sealing on the direction in sealing processing.Clamp (20) is sealed in the stepped heating of figure IV (a) expression and corresponding stepped the heating sealed clamp (21).Distance between the corresponding sealing surface of two clamps is X.Owing to the difference of the temperature of sealing the different cascaded surfaces that cause sealing clamp of surperficial distance from heater element has just caused tear strength didn't change.Figure IV (b) is represented another structure, and it adopts two planes to seal clamp, the clamp (23) of a clamp that does not heat (22) and a heating, and wherein different temperature is owing to have thermal insulation material (24) in the clamp.Because the effect of thermal insulation material, the temperature of 25 partial sums, 26 parts of heating clamp is lower than 27 parts during operation.Clamp (20) and (21) the two one of can be resilient.

The figure V is represented a kind of heat-sealing mouth structure, utilizes this structure to produce different peel strengths by changing the dwell time.Take heating clamp (28) and two clamps that do not heat (29) that can move respectively and (30) are used altogether.In when operation, with heating and the clamp that do not heat separately with certain clearance X, thereby by remove out two clamps 29 and 30 one another then continue heat-sealing and realize changing the dwell time.Clamp in this case, preferably clamp 28, can be resilient.

The figure VI is represented a kind of heat-sealing mouthful clamp structure, its seal peel strength be not both that comprehensive variation by clamp pressure and temperature produces.This shown structure and figure III category-B seemingly, only not heating clamp (31) is the plane, and the part sealing surface (33) of heating clamp (32) is parallel to 31, and another part (34) is the inclined-plane and departs from 31.Owing to the different variations that cause clamp pressure of the distance between clamp, owing to the distance different temperature traverses that cause hot clamp of sealing surface 32 with heater element.Any of two clamps can be resilient.

The figure VII is represented a kind of heat-sealing clamp structure, and its seal tear strength didn't change is comprehensive the generation by the variation of clamp pressure dwell time.What it had adopted that a plane seals that clamp (34) and one has that ladder seals face does not heat clamp (35).To partly be contained on the spring (37) near 34 35 ledge surface, and can be with respect to 35 remainder motion.In the operation, not being both of clamp pressure produces owing to the gap of clamp is different.Do not heating clamp (35) when removing out, spring 37 elongation has increased and dwell time of the contacted sealing surface of resilient clamp (34) (36) preferably.

If in the figure VII, clamp 35 is resilient and clamp 34 and parts 36 are nonelastic, or harder, and then when clamp closed up fully, the contact pressure at 34/36 interface can be higher than 34/35 interface.

Claims

1, a kind of sealed package is characterized in that an exterior seal that does not break comprising that one or more layers soft polymer sheet seals, the rupturable seal of in-to-in, and between inside and outside seal, have certain interval.

2, packing as claimed in claim 1 is characterized in that comprising between an inside and outside seal in fact not comprising the space of packing content.

3, packing as claimed in claim 1 is characterized in that including a more than rupturable seal of in-to-in.

4, as the described packing of claim 1,2 or 3, the peel strength that it is characterized in that the inner sealing mouth is low than the outside seal mouth.

5, packing as claimed in claim 4 is characterized in that containing a more than inner sealing mouth lower than outside seal mouth peel strength, and has between inside and outside seal and between per two inner sealing mouths at interval.

6, packing as claimed in claim 4 is characterized in that will packing the unit that is divided into several contents of dressing part separately with one or several inner sealing mouth.

7, as claim 1,2 or 3 described packings, it is characterized in that comprising an exterior seal that does not break and an in-to-in rupturable seal mouth, latter system is bonded in the packing outside face by the faint adhesive agent of turning up of part packaging and forms, and the packing of turning up part is interior without any the packing content.

8,, it is characterized in that comprising an exterior not rupture seal mouth and a connection sheet (gusset) of fixing with rupturable seal mouth overlap joint as the described packing of claim 1,2 or 3.

9, as the described packing of preceding each claim, it is characterized in that comprising one or more inner sealing mouths with close clearance, these close clearances provide the passage in the space between inside and outside seal.

10,, it is characterized in that wrapping in the easiest position of falling breakage of packing and have a rupturable seal as the described packing of preceding each claim.

11, as the described packing of preceding each claim, it is characterized in that one or the polymer sheet of every layer of softness be water miscible or water dispersible.

12, packing as claimed in claim 11 is characterized in that the material of water-soluble or water dispersible comprises polyethylene oxide, methylcellulose or polyvinyl alcohol.

13, packing as claimed in claim 12 is characterized in that the material of water-soluble or water dispersible comprises the polyvinyl alcohol that can be dissolved in cold water, and it is to be formed through 40-90% hydrolysis or alcoholysis by polyvinyl acetate.

14,, it is characterized in that its content can be released contact back 10 minutes with water after as the described packing of claim 11-13.

15, packing as claimed in claim 14 is characterized in that its content can be released in 1 minute.

16, as the described packing of preceding each claim, the composite that it is characterized in that its dressing is liquid state or gel.

17,, it is characterized in that liquid or the gel of its dressing 5ml-10l as the described packing of preceding each claim.

18, as the described packing of preceding each claim, what it is characterized in that its dressing is a composition pesticide.

19, packing as claimed in claim 18 is characterized in that composite comprises monohydroxy benzonitrile herbicide.

20, packing as claimed in claim 19 is characterized in that hydroxy-benzyl nitrile herbicide comprises the miscellany of ioxynil and bromoxynil ester class.

21, as the described packing of preceding each claim, it is characterized in that one or the thickness of each sheet material be 20-500 μ m.