CN102464112B - Rice atmosphere packaging method and product thereof - Google Patents
Rice atmosphere packaging method and product thereof Download PDFInfo
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Abstract
The invention relates to a rice atmosphere packaging method and a product thereof. The packaging method at least comprises the following steps of: placing rice in a packaging part, inflating preservation air into the packaging part, and sealing the packaging part, wherein during sealing, in the air in the packaging part, the volume percentage of carbon dioxide is controlled to be in a low level, and the volume concentration of carbon dioxide is not needed to be controlled to be 50 to 80 percent. When the technical scheme is adopted, the better effects of insect prevention, mould proofing, and preservation effects are achieved, and the air inflation cost is reduced; and the packaging form is appropriate, so the damage rate in the conveying and selling process is reduced.
Description
Technical field
The present invention relates to agricultural product packaging and storage technique field, particularly the packing of rice and storage technique field, relate in particular to a kind of rice atmosphere packaging method and products thereof.
Background technology
Rice is the finished product that paddy is made after the operations such as cleaning, husk rice, finished product arrangement.China and world market are divided into long-grained nonglutinous rice, polished rice and glutinous rice three classes according to particle shape and grain matter by rice usually.In the international market, again according to paddy processing stage and job operation, rice is had again to following classification: brown rice, rice, preboiled rice, crack rice.
There are many difficulties in preservation and freshness aspect about rice always.
Present stage, China grows (being generally 3～6 months) from the rice processing to the interval time selling, yet, rice after paddy processing has lost the protective cover of cot, organizational structure exposes, very easily occur infested, go mouldy, the problem such as dehydration, and then cause edible quality to descend, or cause food-safety problem; Simultaneously, the grain of rice after milling itself still remains a biological living, is also constantly carrying out the biochemical reactions such as breathing of self, time has been grown, and can cause the protein loss of rice, and the phenomenon such as even occur becoming sour, structure and the quality of rice change, and the food flavor value descends.
Therefore, the packing of rice (such as the form at packing and the aspects such as material, packing method) seems particularly important for the preservation and freshness of rice.In addition, everybody should be understood that packing is also of crucial importance for maintenance, the product preservation and freshness of the packing effect of the transportation of product (transportation convenience degree, cost control) and transportation.
About the packing of rice, generally adopt the form of packaging bag, for example the common plastics woven bag also can apply the film layer of layer of polyethylene or polypropylene material usually on the outside face of common plastics woven bag.But still not, its anti-extraneous infection ability is poor, easily is subject to the pollution of outside insect pest, also affected by outside humiture larger, inadequate to insect protected, mildew-resistant, the fresh-keeping aspect effect of product.
This just needs us to make an effort on the improvement packing method.At present, those skilled in the art begin one's study and the carbon dioxide controlled atmospheric packing are applied to the packing of rice, result of study shows, carbon dioxide in controlled atmospheric packing can fully penetrate in rice, suppress or stop the biochemical reactions such as respiration of rice, reduce the loss of protein, also can there is insecticidal effect preferably simultaneously.
Referring to publication number, it is CN101057608A Chinese invention patent prospectus, this patent discloses a kind of carbon dioxide controlled atmospheric packing method that adopts and the grain that comprises rice has been carried out to the method for fresh-keeping packaging, wherein proposing need to be to the fresh-keeping gas of the carbon dioxide that is filled with high concentration in packing (gas gross 70%), just can make protein in smother, dormancy fully, form negative pressure in the thin-walled plastic container, grain is compressed, the plumule of grain and top layer have perfect shelter like this, can not come off, thereby reach fresh-keeping purpose, freshness date was more than 1 year.
Referring to publication number, be CN101416659A Chinese invention patent prospectus, this patent discloses a kind of foodstuff activity preserving package bag system, by gas regulator, the oxygen concentration in packaging bag is controlled at below 2%, and carbon dioxide is controlled at 50%-80%.Point out general O in literary composition
2during concentration<8%, the rice insect is had to apparent in view lethal effect, O
2when content is 5%～7%, 1～2 week interior can killing off the insect pests.CO
2the required concentration that kills off the insect pests is generally higher, mostly is 60%～80%.
In addition, also there is document " rice with air regulation preservation and freshness research " (Pan Juzhong etc., [J] is fresh-keeping and process 2005) to propose gas concentration lwevel and need be greater than 80%.
To sum up, the carbon dioxide controlled atmospheric packing method field about rice, it has been generally acknowledged that O
2concentration<8%, carbon dioxide be controlled at 50%-80% and more than, just can reach preferably insect protected, mildew-resistant, fresh-keeping effect.
Summary of the invention
One aspect of the present invention provides a kind of rice atmosphere packaging method, the method at least comprises rice is placed in to the package member of being made by bubble-tight packing, and be filled with fresh-keeping gas in described package member, finally described package member is carried out the step of pressurizing window, during pressurizing window, in the internal gas of described package member, the percent by volume of carbon dioxide is 16-40%.
The contriver, through lot of experiments, finds beyond expectationly, without the carbon dioxide volume concentration is controlled to 50%～80%, when adopting technique scheme, also can obtain preferably insect protected, mildew-resistant, fresh-keeping effect.
In a specific embodiment of the present invention, gas concentration lwevel is 25%.In a specific embodiment of the present invention, gas concentration lwevel is 30%.In a specific embodiment of the present invention, gas concentration lwevel is 28%.In a specific embodiment of the present invention, gas concentration lwevel is 32%, and in another embodiment, gas concentration lwevel is 35%.In a specific embodiment of the present invention, gas concentration lwevel is 16%.In another specific embodiment of the present invention, gas concentration lwevel is 40%.
In a specific embodiments of the present invention, the percent by volume of oxygen is less than 21%.Preferably, oxygen concentration is 8%-18%.Preferred, oxygen concentration is 12-16%.Preferred, oxygen concentration is 14-15%.Preferably, oxygen concentration is less than 8%.Preferred oxygen concentration is 0.
In addition, the contriver finds under study for action, when rice is carried out to controlled atmospheric packing, be filled with carbonated fresh-keeping gas, after pressurizing window, rice surface can to carbon dioxide continue absorption, in package member always in negative pressure state, (be generally 6-50 hour) after after a while, it is stable that the package member internal gas pressure reaches substantially.If the fresh-keeping atmospheric carbon dioxide excessive concentration be filled with, air pressure when the package member internal gas pressure is stablized too low (excessive with the ambient pressure difference), be easy to cause flat bag and the bale broken problem of packaging bag, especially for the rice packaging product of inner wrapping specification.In addition, in the process of transportation, if while in package member, still having certain density carbon dioxide, the continuous negative pressure state in package member is very unfavorable to the transportation of packaging product.
For this reason, the contriver has done further improvement on the basis of technique scheme, and when selecting a suitable density of carbon dioxide gas, package member internal gas cumulative volume during to pressurizing window (gas reservation amount) is controlled to a certain extent.
As further improvement in the technical proposal, during pressurizing window, the ratio of the total mass of the inner rice of described package member internal gas cumulative volume and described package member is 500ml/kg～700ml/kg, and the numerical value that calculates the internal gas cumulative volume that this ratio adopts is the volume metering numerical value under standard condition STP (0 ℃, one barometric pressure) with this internal gas.
This technical scheme has adopted a comparatively moderate gas concentration lwevel, and unexpected the discovery still can be obtained better insect protected, mildew-resistant, fresh-keeping effect without adopting existing high concentration on the one hand; On the other hand, select the gas concentration lwevel of this particular range and control corresponding gas reservation amount, guaranteed after the package member internal gas pressure is stable, between package member air pressure inside and external atmosphere pressure, difference is not too large, after accumulating, sales process in, the flat bag of rice packaging product and the probability of bale broken are lower, after the rice packaging packaging products in boxes, occur that the probability that swell and casing subside is lower simultaneously, are convenient to the transportation storage.
According to relation (PV=nRT, R is constant) between the pressure of gas, volume, molal quantity, temperature, in the certain situation of the amount of gas (molal quantity), volume can change with the variation of temperature and pressure.Therefore, temperature during rice packaging, the difference of inflation pressure, the volume of internal gas can be different.For accurate statement, above-mentioned package member internal gas numerical total volume (also claiming gas retention body accumulated amount) is the volume metering numerical value under standard condition STP (standard temperature and pressure) (0 ℃, one barometric pressure).Those skilled in the art, can be according to common practise, formula etc. after knowing technique scheme, and the above-mentioned numerical value of take becomes the volume numerical value under concrete package temperature and pressure as basis conversion.
Preferably, during pressurizing window, described package member internal gas cumulative volume (measuring numerical value under the standard condition) is 530ml/kg～680ml/kg with the ratio of the total mass of the inner rice of described package member.Preferred, ratio is 550ml/kg～650ml/kg.Choosing is more arranged, and ratio is 580ml/kg～620ml/kg.
In a specific embodiment of the present invention, during pressurizing window, being packaged with 0.68kg rice and cumulative volume in described package member is the internal gas of 380-420ml (measuring numerical value under the standard condition).Preferred, if during pressurizing window, in package member, be normal temperature and pressure (20-25 degree centigrade of left and right, 1 barometric pressure), 0.68kg specification rice packaging product, package member internal gas cumulative volume is about 430ml.
In a specific embodiment of the present invention, being packaged with 2.5kg rice and cumulative volume in described package member is the internal gas of 1520-1600ml (measuring numerical value under the standard condition).Preferred, if during pressurizing window, in package member, be normal temperature and pressure (20-25 degree centigrade of left and right, 1 barometric pressure), 2.5kg specification rice packaging product, package member internal gas cumulative volume is about 1700ml.
In a specific embodiment of the present invention, being packaged with 5kg rice and cumulative volume in described package member is the internal gas of 2950-3100ml (measuring numerical value under the standard condition); Preferred, if during pressurizing window, in package member, be normal temperature and pressure (20-25 degree centigrade of left and right, 1 barometric pressure), 5kg specification rice packaging product, package member internal gas cumulative volume is about 3300ml.
In a specific embodiment of the present invention, being packaged with 10kg rice and cumulative volume in described package member is the internal gas of 5900-6100ml (measuring numerical value under the standard condition).Preferred, if during pressurizing window, in package member, be normal temperature and pressure (20-25 degree centigrade of left and right, 1 barometric pressure), 5kg specification rice packaging product, package member internal gas cumulative volume is about 6500ml.
In a specific embodiment of the present invention, during pressurizing window, in the internal gas of described package member, except carbon dioxide and oxygen, the unreactable gas that the nitrogen that to go back the occlusion body volume concentrations be 45-65% and volume concentration are 0.5-1%.Preferably, described unreactable gas main component is argon gas.
In a specific embodiment of the present invention, after completing 5～20h after described package member pressurizing window, the air pressure inside of described package member is 0.50-1 barometric pressure (under the normal temperature state, 20-25 degree centigrade of left and right).
In a specific embodiments of the present invention, this rice atmosphere packaging method comprises the step that next coming in order carry out: 1) rice is filled in described package member from top to bottom; 2) be filled with fresh-keeping gas in described package member, the inflation position is any place that the rice part is housed in described package member, and the percent by volume of the carbon dioxide of described fresh-keeping gas is 25-35%, and the percent by volume of oxygen is less than 21%; 3) gas of rice top in described package member carried out to pump-down process; 4) described package member is carried out to pressurizing window.
Preferably, step 1) described inflation position, in the bottom of described package member, is filled with fresh-keeping gas from the bottom up, makes fresh-keeping gas can fill the space of rice as far as possible.
Step 2) aeration step, gas filled device can adopt the conventional gas filled device (inflation parameter: inflation pressure, flow of aerating air and time are depending on packing specification and corresponding gas retention body accumulated amount, concrete room temperature) of this area.
Step 3) steps of exhausting, preferably that the air of rice top in packaging bag is all emptying.
Preferably, described fresh-keeping gas except carbon dioxide and oxygen, the unreactable gas that the nitrogen that to go back the occlusion body volume concentrations be 45-65% and volume concentration are 0.5-1%.
In a specific embodiments of the present invention, the packaging bag of described package member for being made by flexible packaging material.Described flexible packaging material is non-rigid and has the material of air-tightness effect, can select the airtight material that can be used in the rice gas flushing pouch known to those skilled in the art.Preferably, described packaging bag is the vinyon packaging bag.Described polyethylene (PE) plastic packaging bag.
For example, according to the current packaging material form of conventional rice package bag (can with reference to the packaging material of the imperial fish products board of gold packaging bag) on the market, in general, the packaging material internal dimensions that 0.68kg specification rice packaging product adopts is about 290mm*150mm; 2.5kg the packaging material internal dimensions that specification rice packaging product adopts is about 375mm*255mm; The packaging material internal dimensions that 5kg specification rice packaging product adopts is about 535mm*300mm; The packaging material internal dimensions that 10kg specification rice packaging product adopts is about 585mm*370mm.
The present invention provides the rice packaging product that adopts above-mentioned rice atmosphere packaging method to obtain on the other hand.
The accompanying drawing explanation
Fig. 1 is ageing each gas concentration lwevel impact on rice aliphatic acid after 60 days.
Fig. 2 is ageing each gas concentration lwevel impact on the rice organoleptic quality after 30 days.
The specific embodiment
In order more clearly to understand technology contents of the present invention, especially exemplified by following examples, describe in detail.
The volume numerical value occurred in following examples, what do not illustrate is the volume numerical value under normal temperature and pressure; Gas concentration does not illustrate is volume concentration.
In following examples, in fresh-keeping gas used, the carbon dioxide mixed is carbon dioxide for foodstuff, purity-99.992*10
-2v/V, free from extraneous odour, aqueous water, oil do not detect, aqueous vapor+ethanol content<0.005*10
-2m/m.
The rice packaging method concrete steps that adopt in following examples are as follows:
1) rice is filled in the packaging bag of dimension size from top to bottom; 2) be filled with fresh-keeping gas in packaging bag, the bottom that the inflation position is packaging bag, (the inflation parameter: inflation pressure is a little more than a barometric pressure (0.18Mpa) for the conventional gas filled device of gas filled device employing this area, temperature is normal temperature, and flow of aerating air and time are depending on packing specification and corresponding gas retention body accumulated amount); 3) pump-down process (air of rice top in packaging bag is all emptying) is carried out in the gas of rice top in packaging bag; 4) each opening of packaging bag is carried out to the pressurizing window processing.
The different gas concentration lwevels of embodiment 1 are to preserving rice, and mildew-resistant, suppress the impact of ovulation development
Totally 7 experimental group, every group is filled to 0.68kg rice (the little raised path between farm fields rice in golden imperial fish autumn fields) in the packaging bag (packaging bag of golden imperial fish autumn fields little raised path between farm fields brand 0.68kg specification) that packaging material is of a size of 290mm*150mm, packing method is referring to above-mentioned, the packaging product of each experimental group, during pressurizing window, in packaging bag, volume of gas (gas reservation amount) is 432.5ml.
Every group of fresh-keeping gas be filled with, gas concentration lwevel is respectively 0%, 15%, 25%, 35%, 45%, 75%, 95% (the 1st group of oxygen concentration is that 21%, the 2-5 group oxygen concentration is that 15%, the 6 group of oxygen concentration is 10%, the 7th group of oxygen concentration is 3%, every group of inert gas concentration is 0.6%, and remaining is nitrogen substantially), 3 every group are parallel.
First test: above-mentioned each experimental group packaging product is put into to 40 ℃ of temperature, carry out ageing under the condition that humidity is 80%, the results of regular determination fatty acid value also carries out organoleptic quality evaluations (result value is got 3 parallel mean values).
The measuring method of fatty acid value: the method for ginseng GB GB/T15684-1995 is measured, and numerical value unit is that mg/100g is the milligram number of every 100 gram sample institute fatty acids.
The evaluation method of organoleptic quality: adopt the mode (3 samples are an evaluation group) of combination to carry out recycle ratio in above-mentioned 7 samples, method with reference to GB GB/T15682-2008 is estimated, the sample meter 3 minutes of sensory evaluation total points first place in every evaluation group, second place meter 2 minutes, third meter 1 minute, each sample in recycle ratio the total mark in participate in its sensory evaluation score value of value representation of number of times relatively divided by it.
The second batch test: a certain amount of worm's ovum of inoculation in above-mentioned each experimental group packaging product, put into 28 ℃ of temperature, carry out ageing under the condition that humidity is 75%, measure egg hatch number (result value is got 3 parallel mean values).Above-mentioned test result is in Table 1 and Fig. 1-2.
The measuring method of egg hatch number: above-mentioned sample is unpacked, calculate the adult quantity hatched.
In first test, ageing the 60th day, the 2nd experimental group, filled 15%CO
2map product (surpassed 25mg/100kg and quality deterioration occurred), its fatty acid value is greater than all the other each experimental group, no significant difference between the fatty acid value of all the other each experimental group.Known from table 1, Fig. 1,15%CO
2suppress the fat oxidation ability poor, 25%-95%CO
2controlled atmospheric packing suppress fat oxidation ability no significant difference.
From table 1, Fig. 2, gas concentration lwevel is 25%, 35%, 45%, and the effect of the better organoleptic quality of maintenance rice of 95% controlled atmospheric packing is better than not gas flush packaging, between each concentration on the no significant difference that affects of quality.The controlled atmospheric packing fresh-keeping effect that concentration is 15%, 75% is not obvious.
As known from Table 1, controlled atmospheric packing all can suppress the growth of worm's ovum, between each gas concentration lwevel of this inhibit function without significant difference.
Simultaneously, can learn 15%CO from experiment
2-95%CO
2controlled atmospheric packing certain mould fungus inhibition energy for growth is arranged, and no significant difference between each concentration.
The different gas concentration lwevels of table 1 are hatched the number impact to fatty acid value, sensory evaluation, worm's ovum
Annotate: 1, fatty acid value is the testing result of promoting ageing after 60 days.
2, Analyses Methods for Sensory Evaluation Results is promoting ageing result after 30 days, and the sensory evaluation mark is higher, shows that edible quality is better
3, the aviation value that in figure, data are parallel sample in each group.
Experiment conclusion: in the certain situation of gas volume, the rice with air regulation that gas concentration lwevel is 25%-35% is packed to have and is suppressed preferably fat oxidation, mildew-resistant, the effect of inhibition ovulation development, the rice with air regulation packing that this effect and gas concentration lwevel are 45%-95% is more or less the same.But the mark of sensory evaluation is very high, the edible quality of rice is higher than the controlled atmospheric packing of 45-75%, and the rice with air regulation of gas concentration lwevel 95% packing quite.
And the rice with air regulation that gas concentration lwevel is 25%-35% packing reduces due to air consumption, can economize on significantly the gas cost, enhance productivity.
Therefore, consider inhibition fat oxidation in above-mentioned rice preservation, mildew-resistant, press down effect and the cost of worm, edible quality aspect, in the rice with air regulation packing, gas concentration lwevel is 25%-35% the best.
Embodiment 2
5kg rice (the little raised path between farm fields rice in golden imperial fish autumn fields) is filled in the packaging bag (the little raised path between farm fields brand in golden imperial fish autumn fields) that packaging material is of a size of 535mm*300mm, packing method is referring to above-mentioned, during pressurizing window, in packaging bag, volume of gas (gas reservation amount) is 3300ml, the carbon dioxide volume concentration is 25%, and the carrier of oxygen volume concentrations is 15%, and the nitrogen volume concentrations is 56%, the unreactable gas volume concentration is about 0.7%, and remainder is a small amount of foreign gas.
The present embodiment map product is carried out to ageing experiment (experimental technique is with embodiment 1), experimental results show that this controlled atmospheric packing has good fresh-keeping, mildew-resistant, suppress the effect of ovulation development.
The present embodiment map product, after 12-24 after pressurizing window hour, its air pressure inside is basicly stable, and (air pressure inside is temporarily measured without suitable method at present, but the contriver estimates according to common practise and the visual observation of this area, air pressure inside is a little less than 1 barometric pressure, about 0.8-0.9 barometric pressure left and right), packaging bag is in wrapping form (somewhat similar vacuum packaging, but not as vacuum packet loads), the packaging bag degree of tightness of product is suitable, in transportation, flat bag or breakage of packages do not appear substantially, guaranteed the conformability of product appearance, solved after packaging products in boxes swell and stored the problems such as the later stage casing subsides.
Embodiment 3
2.5kg rice (the little raised path between farm fields rice in golden imperial fish autumn fields) is filled in the packaging bag (the little raised path between farm fields brand in golden imperial fish autumn fields) that packaging material is of a size of 375mm*255mm, packing method is referring to above-mentioned, during pressurizing window, in packaging bag, volume of gas (gas reservation amount) is 1700ml, the carbon dioxide volume concentration is 30%, and the carrier of oxygen volume concentrations is 14%, and the nitrogen volume concentrations is 52%, the unreactable gas volume concentration is about 0.6%, and remainder is a small amount of foreign gas
The present embodiment map product is carried out to ageing experiment (experimental technique is with embodiment 1), experimental results show that this controlled atmospheric packing has good fresh-keeping, mildew-resistant, suppress the effect of ovulation development.
The present embodiment map product, after 6-10 after pressurizing window hour, its air pressure inside is basicly stable, and (air pressure inside is temporarily measured without suitable method at present, but the contriver estimates according to common practise and the visual observation of this area, air pressure inside is a little less than 1 barometric pressure, about 0.8-0.9 barometric pressure left and right), packaging bag is in wrapping form (somewhat similar vacuum packaging, but not as vacuum packet loads), the packaging bag degree of tightness of product is suitable, in transportation, flat bag or breakage of packages do not appear substantially, guaranteed the conformability of product appearance, solved after packaging products in boxes swell and stored the problems such as the later stage casing subsides.
Embodiment 4
10kg rice (the little raised path between farm fields rice in golden imperial fish autumn fields) is filled in the packaging bag (the little raised path between farm fields brand in golden imperial fish autumn fields) that packaging material is of a size of 585mm*370mm, packing method is referring to above-mentioned, during pressurizing window, in packaging bag, volume of gas (gas reservation amount) is 6300ml, and the carbon dioxide volume concentration is 28%, the carrier of oxygen volume concentrations is 14.5%, the nitrogen volume concentrations is 54%, and the unreactable gas volume concentration is about 0.6%, and remainder is a small amount of foreign gas.
The present embodiment map product is carried out to ageing experiment (experimental technique is with embodiment 1), experimental results show that this controlled atmospheric packing has good fresh-keeping, mildew-resistant, suppress the effect of ovulation development.
The present embodiment map product, after 24-30 after pressurizing window hour, its air pressure inside is basicly stable, and (air pressure inside is temporarily measured without suitable method at present, but the contriver estimates according to common practise and the visual observation of this area, air pressure inside is a little less than 1 barometric pressure, about 0.8-0.9 barometric pressure left and right), packaging bag is in wrapping form (somewhat similar vacuum packaging, but not as vacuum packet loads), the packaging bag degree of tightness of product is suitable, in transportation, flat bag or breakage of packages do not appear substantially, guaranteed the conformability of product appearance, solved after packaging products in boxes swell and stored the problems such as the later stage casing subsides.
In this specification sheets, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification sheets and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (12)
1. a rice atmosphere packaging method, the method at least comprises rice is placed in to the package member of being made by bubble-tight packing, and be filled with fresh-keeping gas in described package member, finally described package member is carried out the step of pressurizing window, it is characterized in that, during pressurizing window, in the internal gas of described package member, the percent by volume of carbon dioxide is 16-40%.
2. method according to claim 1, is characterized in that, in the internal gas of described package member, the percent by volume of carbon dioxide is 25-30%, and the percent by volume of oxygen is less than 21%.
3. method according to claim 2, it is characterized in that, during pressurizing window, the ratio of the total mass of the inner rice of described package member internal gas cumulative volume and described package member is 500ml/kg～700ml/kg, and the numerical value that calculates the internal gas cumulative volume that this ratio adopts is at standard condition STP(0 ℃, one barometric pressure with this internal gas) under volume metering numerical value.
4. method according to claim 3, is characterized in that, during pressurizing window, and in the internal gas of described package member, except carbon dioxide and oxygen, the unreactable gas that the nitrogen that to go back the occlusion body volume concentrations be 45-65% and volume concentration are 0.5-1%.
5. according to the described method of claim 3 or 4, it is characterized in that, after completing 5～20h after described package member pressurizing window, the air pressure inside of described package member is 0.50-1 barometric pressure (under the normal temperature state).
6. method according to claim 1, is characterized in that, this rice atmosphere packaging method comprises the step that next coming in order carry out:
1) rice is filled in described package member from top to bottom; 2) be filled with fresh-keeping gas in described package member, the inflation position is any place that the rice part is housed in described package member, and the percent by volume of the carbon dioxide of described fresh-keeping gas is 25-35%, and the percent by volume of oxygen is less than 21%; 3) gas of rice top in described package member carried out to pump-down process; 4) described package member is carried out to pressurizing window.
7. method according to claim 6, is characterized in that, described fresh-keeping gas except carbon dioxide and oxygen, the unreactable gas that the nitrogen that to go back the occlusion body volume concentrations be 45-65% and volume concentration are 0.5-1%.
8. method according to claim 6, is characterized in that, described inflation position is in the bottom of described package member.
9. according to the described method of any one in claim 1-4, it is characterized in that the packaging bag of described package member for being made by flexible packaging material.
10. method according to claim 9, is characterized in that, described package member is the vinyon packaging bag.
11. according to the described method of any one in claim 1-4, it is characterized in that, during pressurizing window, being packaged with 0.68kg rice and cumulative volume in described package member is to measure numerical value under the 380-420ml(standard condition) internal gas; Perhaps, being packaged with 2.5kg rice and cumulative volume in described package member is to measure numerical value under the 1520-1600ml(standard condition) internal gas; Perhaps, being packaged with 5kg rice and cumulative volume in described package member is to measure numerical value under the 2950-3100ml(standard condition) internal gas; Perhaps, being packaged with 10kg rice and cumulative volume in described package member is to measure numerical value under the 5900-6100ml(standard condition) internal gas.
12. one kind adopts the rice with air regulation packaging product that in power 1-11, the described method of any one obtains.
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| CN104920602A (en) * | 2015-06-23 | 2015-09-23 | 南通季和米业有限责任公司 | An organic rice storage technology |
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| CN111426809B (en) * | 2020-04-28 | 2021-08-10 | 四川省食品发酵工业研究设计院有限公司 | Method for determining CO required in rice package2Method of concentration |
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| CN101057608A (en) * | 2007-05-28 | 2007-10-24 | 李亚平 | Method for keeping grain fresh |
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| CN102464112A (en) | 2012-05-23 |
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