CN100532214C - Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof - Google Patents
Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof Download PDFInfo
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- CN100532214C CN100532214C CNB2007100614094A CN200710061409A CN100532214C CN 100532214 C CN100532214 C CN 100532214C CN B2007100614094 A CNB2007100614094 A CN B2007100614094A CN 200710061409 A CN200710061409 A CN 200710061409A CN 100532214 C CN100532214 C CN 100532214C
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Abstract
The polythene bag fruit fresh keeping bag is made by adding ventilating mother granule into the polythene, blowing into barrel film, using smooth surface compressing the roller into 1mum-15mum micropore ventilating tubular film into film thickness 0.015mm-0.02mm, with micropore density of 500, 000-1, 000, 000 /m2, ventilating quantity of 15min-70min/(100mmX100mm.20g.1.013X105Pa) fresh keeping bag. It can exhaust Co2 and restraining O2, realizing air conciliation and moisture keeping. The air adjusting fresh keeping bag keeps freshness of food 7 days longer, freezing fresh keeping period longer than 1-2 months.
Description
Technical field
The present invention relates to the postharvest technology of fruits and vegetables field, specifically relate to a kind of controlled atmosphere Fruit and vegetable preserving bag.The invention still further relates to the production technology and the application of this air-adjustable fresh-keeping bag.
Background technology
Fruits and vegetables are human indispensable food.Because fruits and vegetables belong to organism alive, still breathes after plucking, have metabolic activity, so it fresh-keepingly just seems particularly important.The kind of preserving fruit and vegetable utilizing is a lot, and polyethylene blown film is being extensive use of all over the world, but because the common polythene blown film is airtight, waterproof, is causing CO in the packing material easily in the fruit vegetables storing process as the vegetable and fruit packaging thing
2Excessive concentration and be unfavorable for fresh-keeping.
Storage fruit and vegetable uses the most general method that refrigeration and air conditioned storage are arranged at present.Cold storing and fresh-keeping is the basis of modern fruit vegetables storing, also is the method that China generally uses, and accounts for more than 95% of China's fruits and vegetables reserves.Cold-storage and fresh-keeping method is simple, but shelf life is shorter, and fresh-keeping effect is relatively poor.Air conditioned storage is contemporary state-of-the-art fruit vegetables storing technology, and it is by means of mechanical equipment, controls the gas in the controlled atmosphere cold storage environment artificially, to realize preserving fruit and vegetable utilizing.Since Britain scientist invention apple air conditioned storage method in 1918, air conditioned storage is generally promoted all over the world, and becomes the important means of fruit fresh-keeping.The fresh-keeping development phase that is in China air conditioned storage storehouse, air conditioned storage Processes and apparatus technical sophistication, invest relatively large, and the agricultural products in China class is generally lower, fruit and vegetable varieties difference, place of production climate difference in addition, cause the gentle furnishing part of storage property difference of fruits and vegetables also bigger, the storage technology technical requirements also is not quite similar, because lacking corresponding air conditioned storage basic investigation and pilot scale demonstration drops into, limit the application in preserving fruit and vegetable utilizing processing of sophisticated equipment and technology, made China's air conditioned storage slower development.
In recent years, plastic film bag controlled atmosphere technology is widely used in the fresh-keeping of fresh fruit of vegetables, and with annual 20% speed increment.The U.S. is carrying out the research of ventilation freshness protection package, mainly is to add natural activity potter's clay in poly-vinyl resin, but because the throughput of freshness protection package is too little, can not solves a bag interior CO
2Higher problem.Japan uses minute aperture PP blister-pack leek, can be fresh-keeping 5 days under 20 ℃ condition.The Renlaut of France etc. studies show that, adopts microporous membrane can effectively solve the problem of strawberry controlled atmospheric packing, and the porous silica gel film of perforation can satisfy the controlled atmospheric packing requirement of wild cabbage, prolongs its shelf life.More than test has only illustrated and has utilized that microporous barrier is fresh-keeping to have certain effect, but microporous barrier still exists the too small problem of throughput, more can not be with the CO in the bag
2Discharge, make O
2Enter in the bag and the while controlled humidity, out of reach controlled atmosphere and the effect of preserving moisture, field of application is very limited.The perforated film of bibliographical information is actually on the film bag and punches, and can discharge CO
2Deng pernicious gas, but can not control O
2Enter, moistening effect is poor, and certain short-term fresh-keeping effect is only arranged.
Because bright jujube has higher metabolic activity, the easy dehydration of duration of storage causes freshness to reduce, and easily accumulates ethanol in pulp, quickens pulp softening, and bright in addition jujube is to CO
2Content is responsive especially, makes bright jujube become the very big a kind of fruit of fresh-keeping difficulty in the fruits and vegetables.According to research to bright jujube physiology, pathology and holding conditions, " low temperature, high humidity, low O
2, ultralow CO
2, anticorrosion " technical measures are core technology conditions of the storage of fresh jujube.Present existing storage facilities such as freezer, air-conditioned cold store, pressure regulating equipment etc. are had any problem to satisfying above-mentioned condition fully, can not satisfy CO
2Responsive fruit such as bright jujube fresh-keeping.
Summary of the invention
It is big to the purpose of this invention is to provide a kind of throughput, can control CO
2Discharge and O
2Enter the polyethylene fruit and vegetable air-conditioning preservation bag that is retentive of moisture simultaneously.
A kind of production technology of polyethylene fruit and vegetable air-conditioning preservation bag is provided, and is another goal of the invention of the present invention.
The present invention also aims to provide this application of polyethylene fruit and vegetable air-conditioning preservation bag on bright jujube is fresh-keeping.
Polyethylene fruit and vegetable air-conditioning preservation bag of the present invention is to add the ventilative master batch that accounts for its weight 0.1%～0.3% in polythene material, on blow moulding machine, be blow molded into a film, use up the ventilative master batch of face twin rollers extruding, the tube film is squeezed into has the long finely porous permeability tube film of 1 μ m～15 μ m holes, the single radial cut air-adjustable fresh-keeping bag is made in the cutting heat-sealing again.
Wherein, described ventilative master batch is the particle of being made by following raw materials by weight percent blend:
Alkaline nano porous granule 20%～30%
Nano-ZnO
20.01%～0.1%
EVA (ethene-vinyl acetate co-polymer) 1%～5%
LLDPE (linear low density polyethylene) 25%～35%
LDPE (low-density high-pressure polyethylene) 25%～35%
HDPE (high density low pressure polyethylene) 6%～9%.
For the polyethylene freshness protection package that guarantees preparation has good flexibility and interpolation property, the weight percent proportioning of its primary raw material polythene material is: LLDPE: LDPE: HDPE=4: 4: 1.
Described alkaline nano porous granule is semicoke and/or activated clay.
Make freshness protection package have good fresh-keeping effect, must be when moisture be controlled, flux that can adjustments of gas, for this reason, the present invention as additive, utilizes the finely porous surface force of semicoke and activated clay that fruits and vegetables are breathed the moisture retention that produces in hole with alkaline nano porous granule semicoke and/or activated clay, when moisture loss obviously reduces, form the medium that gas is passed through, reached gas-selectively is passed through, prolonged the purpose of preserving fruit and vegetable utilizing phase.Semicoke that the present invention uses and activated clay are to pass through the particle of the particle diameter of 200 mesh sieves as 0.015mm～0.076mm, and this particle has the aperture of 2nm～110nm, and particle diameter is 1～5 times of permeability tube film thickness.
Consider the antibacterial effect that strengthens freshness protection package, the present invention has also added an amount of nano-ZnO in raw material
2
Polyethylene fruit and vegetable air-conditioning preservation bag tube film thickness 0.015mm～0.02mm that the present invention makes, 50～1,000,000/m of tube membrane micropore density
2, Air permenbility is 15min～70min/ (100mm * 100mm20g1.013 * 10
5Pa), soon behind the freshness protection package top off of a long 100mm * wide 100mm, place the weight of 1 20g above, depress at 1 standard atmosphere, the time that gas is discharged in the freshness protection package is that 15min is to 70min.
The present invention also provides the concrete production technology of polyethylene fruit and vegetable air-conditioning preservation bag, and this technology comprises:
1. with semicoke and/or activated clay oven dry, pulverize,, filter out the particle that particle diameter is 0.015mm～0.076mm by 200 mesh sieves;
2. in above-mentioned particle, add nano-ZnO
2, EVA, LDPE, LLDPE and HDPE, make ventilative master batch through the blend extruder;
3. in proportion LLDPE, LDPE and HDPE are mixed, add the ventilative master batch that accounts for its weight 0.1%～0.3%, the blow moulding machine of packing into after the mixing is blow molded into a film;
4. adopt light face twin rollers that the tube film is squeezed into thickness 0.015mm～0.020mm, face has 1 μ m～long micropore in 15 μ m holes, pore density 50～1,000,000/m
2Permeability tube film;
With permeability tube film through the heat-sealing, the cutting, make polyethylene fruit and vegetable air-conditioning preservation bag.
Wherein the pulverizing of semicoke and/or activated clay is to pulverize with the mine ball grinding mill earlier, adopts ultra micro wind-force comminutor selection by winnowing to go out the particle that particle diameter is 0.015mm～0.076mm again.
Particularly, wherein ventilative master batch is to make through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry on twin screw blend extruder, a tube film be on blow moulding machine through 175 ℃ of heating, blend, extrude, blowing makes.
The present invention tests by Water Curtain Cave, finds the CO in the Water Curtain Cave
2And O
2Concentration can reduce simultaneously, and under the situation that total tolerance reduces, gas can cover automatically to keep the in-to-in air pressure balance in the Water Curtain Cave.
The present invention also finds, in water, add the alkaline nano porous granule after, CO
2Concentration can be reduced to zero.Because the alkaline nano porous granule has very strong hygroscopic property, can form water membrane, produce absorption and desorption performance to gas, and the freezing point of hydroscopic water is-7.8 ℃, the freezing point of membranaceous water is-4 ℃, and under normal temperature and lower temperature, moisture is difficult for scattering and disappearing and is not-easy-to-freeze.Therefore, as additive, the microporous polyethylene plastic film can be transformed into the polyethylene preservative film that has the water hole structure with the alkaline nano porous granule.
Above-mentioned Water Curtain Cave principle is transplanted in the research of preserving fruit and vegetable utilizing material, has been prepared polyethylene fruit and vegetable air-conditioning preservation bag of the present invention.
Polyethylene fruit and vegetable air-conditioning preservation bag of the present invention has overcome the little and making hole film of existing both at home and abroad microporous barrier throughput can not control O
2Enter and the technology drawback of moistening effect difference, in the process of packing fruits and vegetables, when preserving moisture, can be with CO in the freshness protection package
2Discharge and also suppress O effectively
2, make controlled atmosphere and the realization simultaneously of preserving moisture, reach desirable fresh-keeping effect.Use polyethylene fruit and vegetable air-conditioning preservation bag of the present invention lower, under the constant heat storage condition, can be used for the long-period freshness preserving of multiple fruits and vegetables, under normal temperature condition, can be used for prolonging shelf life than air-conditioned cold store and air regulating box operating cost, also very favourable to long-distance transport.Because easy to use, its application is very extensive, the development of rotting, promote world agriculture that reduces fruits and vegetables and the quality of life that improves people there is significant role.
The present invention also provides the application of polyethylene fruit and vegetable air-conditioning preservation bag on bright jujube is fresh-keeping.
Bright jujube is a kind of non-climacteric type fruit, and metabolic activity is strong, to CO
2Very responsive, wineization easily takes place, easily dehydration is softening, and the normal-temperature fresh-keeping phase is very short, and only several days time, the cryopreservation freshness date also has only about one month.Use polyethylene fruit and vegetable air-conditioning preservation bag of the present invention to store bright jujube, under the higher environmental conditions of relative humidity, bright jujube can be breathed the moisture retention that produces and in the alkaline nano porous granule, form metastable moisture film, moisture film is made up of hydroscopic water, membranaceous water and capillary, the adsorption affinity of hydroscopic water is 31～10000 barometric pressures, the adsorption affinity of membranaceous water is 6.25～31 barometric pressures, and the adsorption affinity of capillary is 1～6.25 barometric pressure.Moisture film in the alkaline nano porous granule becomes the medium that gas passes through again when moisture loss is reduced, bright jujube is breathed the CO that produces
2Absorbed by moisture film, because airborne CO
2Concentration is lower, will make CO
2Constantly to external diffusion, this phenomenon can be analogous to the carbonated water beverage of one glass of opening, along with the prolongation of standing time, CO
2Will overflow automatically; Simultaneously, bright jujube is breathed necessary O
2Also will inwardly spread by this moisture film medium.When the oxygen-supply quantity of medium was big inadequately, moisture film can destroy moment, makes air admission, and the external and internal pressure of keeping freshness protection package is played equilibrium activity.Though freshness protection package can not be with O
2Control to very low level fully, but can be with O
2Be reduced in the certain limit, reach the selectivity of gas is passed through, thereby suppress the respiratory intensity of bright jujube, the freshness date that prolongs bright jujube.
Under refrigerated condition, polyethylene fruit and vegetable air-conditioning preservation bag of the present invention can make the freshness date of bright jujube class fruits and vegetables extend to 4 months, can be used for CO
2The preservation and freshness of fruits and vegetables such as responsive bright jujube, pears, blue or green banana, bright fresh kidney beans, green pepper, shallot, rape, spinach, shelf life prolongs more than 7 days than common freshness protection package, the cold storing and fresh-keeping phase prolongs 1～2 month than common freshness protection package, fresh fruit weightlessness is less than 0.5%, crisp good fruit rate is greater than 96%, and the fruit rate of rotting is less than 1%.
The specific embodiment
Embodiment 1
Get 5kg activated clay and 5kg semicoke and mix the back oven dry, pulverize with the mine ball grinding mill earlier, adopt ultra micro wind-force comminutor selection by winnowing again,, select the particle 8kg that particle diameter is no more than 0.076mm by 200 mesh sieves.
In above-mentioned particle, add the 18g nano-ZnO
2, 0.8kgEVA, 8kgLDPE, 8kgLLDPE and 2kgHDPE, the SJSH-30 twin screw blend extruder of packing into after mixing through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry, is made ventilative master batch.
Get 40kgLLDPE, 40kgLDPE and mix, add the ventilative master batch of 0.27kg with 10kgHDPE, the SJM-F1600 blow moulding machine of packing into after mixing, in 175 ℃ of following heating, blend, extrude, blowing, make a film.
Adopt the mechanical damping extrusion process technology of light in the face of roller, it is 0.015mm～0.020mm that the tube film is squeezed into thickness, and Kong Changwei 1 μ m～15 μ m, pore density are 50～1,000,000/m
2Permeability tube film.After finishing surperficial pore-forming processing, the tube film is made the tube material that width is different sizes such as 700mm, 450mm, 350mm, 300mm, 200mm respectively, become preservative film after rolling, the packing.
At last, preservative film is sealed on JZ-700D Bag Making Machine, cuts, make the single radial cut air-adjustable fresh-keeping bag that length is respectively the different size of 800mm, 700mm, 650mm, 500mm, 200mm, be kept at the dry place of cooling of no sunlight direct irradiation.
Embodiment 2
Get 5kg activated clay and 5kg semicoke and mix the back oven dry, pulverize with the mine ball grinding mill earlier, adopt ultra micro wind-force comminutor selection by winnowing again,, select the particle 8kg that particle diameter is no more than 0.076mm by 200 mesh sieves.
In above-mentioned particle, add the 10g nano-ZnO
2, 1kgEVA, 10kgLDPE, 10kgLLDPE and 2kgHDPE, the SJSH-30 twin screw blend extruder of packing into after mixing through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry, is made ventilative master batch.
Get 40kgLLDPE, 40kgLDPE and mix, add the ventilative master batch of 0.15kg with 10kgHDPE, the SJM-F1600 blow moulding machine of packing into after mixing, in 175 ℃ of following heating, blend, extrude, blowing, make a film.
Adopt the mechanical damping extrusion process technology of light in the face of roller, it is 0.015mm～0.020mm that the tube film is squeezed into thickness, and Kong Changwei 1 μ m～15 μ m, pore density are 50～1,000,000/m
2Permeability tube film.After finishing surperficial pore-forming processing, the tube film is made the tube of different in width and expected, become preservative film after rolling, the packing.
Preservative film is sealed on JZ-700D Bag Making Machine, cuts, make the single radial cut air-adjustable fresh-keeping bag of different size, be kept at the dry place of cooling of no sunlight direct irradiation.
Embodiment 3
Get the 10kg activated clay, after the oven dry, pulverize with the mine ball grinding mill earlier, adopt ultra micro wind-force comminutor selection by winnowing again,, select the particle 8kg that particle diameter is no more than 0.076mm by 200 mesh sieves.
In above-mentioned particle, add the 12g nano-ZnO
2, 0.8kgEVA, 8kgLDPE, 8kgLLDPE and 2kgHDPE, the SJSH-30 twin screw blend extruder of packing into after mixing through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry, is made ventilative master batch.
Get 40kgLLDPE, 40kgLDPE and mix, add the ventilative master batch of 0.15kg with 10kgHDPE, the SJM-F1600 blow moulding machine of packing into after mixing, in 175 ℃ of following heating, blend, extrude, blowing, make a film.
Adopt the mechanical damping extrusion process technology of light in the face of roller, it is 0.015mm～0.020mm that the tube film is squeezed into thickness, and Kong Changwei 1 μ m～15 μ m, pore density are 50～1,000,000/m
2Permeability tube film.After finishing surperficial pore-forming processing, the tube film is made the tube of different in width and expected, become preservative film after rolling, the packing.
Preservative film is sealed on JZ-700D Bag Making Machine, cuts, make the single radial cut air-adjustable fresh-keeping bag of different size, be kept at the dry place of cooling of no sunlight direct irradiation.
Embodiment 4
Get the 10kg semicoke, after the oven dry, pulverize with the mine ball grinding mill earlier, adopt ultra micro wind-force comminutor selection by winnowing again,, select the particle 8kg that particle diameter is no more than 0.076mm by 200 mesh sieves.
In above-mentioned particle, add the 18g nano-ZnO
2, 1kgEVA, 10kgLDPE, 10kgLLDPE and 2kgHDPE, the SJSH-30 twin screw blend extruder of packing into after mixing through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry, is made ventilative master batch.
Get 40kgLLDPE, 40kgLDPE and mix, add the ventilative master batch of 0.24kg with 10kgHDPE, the SJM-F1600 blow moulding machine of packing into after mixing, in 175 ℃ of following heating, blend, extrude, blowing, make a film.
Adopt the mechanical damping extrusion process technology of light in the face of roller, it is 0.015mm～0.020mm that the tube film is squeezed into thickness, and Kong Changwei 1 μ m～15 μ m, pore density are 50～1,000,000/m
2Permeability tube film.After finishing surperficial pore-forming processing, the tube film is made the tube of different in width and expected, become preservative film after rolling, the packing.
Preservative film is sealed on Jz-700D Bag Making Machine, cuts, make the single radial cut air-adjustable fresh-keeping bag of different size, be kept at the dry place of cooling of no sunlight direct irradiation.
Embodiment 5
On October 7th, 2005, buy 5 tons of winter jujubes back from orchard, Xia Wa town, Zhanhua County, Shandong, degree of ripeness is white ripe phase to the first red phase, transports Taiyuan that night back, fresh-keeping institute has carried out bulge test in the academy of agricultural sciences, Shanxi Province.
Test is divided into 5 thick PVC freshness protection packages of processing: a, 0.03mm; The thick PE freshness protection package of b, 0.025mm; The thick air-adjustable fresh-keeping bag of c, 0.020mm; D, air regulating box; The thick punching bag of e, 0.020mm is contrast CK (the bright jujube of every kg capacity is made a call to the circular hole of 2 diameter 0.8cm on bag).Select do not have to hinder, anosis, single fruit weight in the fruit of 10g～12g is packed bag/case into after precooling, every bag/case 10kg, each handles repetition 3 times.Duration of storage results of regular determination O
2And CO
2Content, the crisp good fruit rate of periodic inspection fruit.
Wherein, the reserve temperature of air-adjustable fresh-keeping bag is-0.5 ℃～-1.5 ℃, and the gas index of air regulating box is controlled at O
2=5%, CO
2＜1%.
Gas component ratio reaches the influence to winter jujube storage effect in the dissimilar freshness protection packages of table 1
From test figures, as can be seen, compare with common freshness protection package, under freezer (0.5 ℃～-1.5 ℃) condition, the CO in the 10kg capacity air-adjustable fresh-keeping bag
2The concentration maxim only is 0.8%, O
2Concentration can be controlled at about 15%, and relative humidity can remain on more than 95% in the bag, has satisfied the storage of fresh jujube substantially to " low temperature, low O
2, ultralow CO
2, high humidity " requirement, thereby storage effect is significantly better than common polyvinylchloride (PVC) bag, polyethylene (PE) bag and punching bag, the crisp good really rate of air-adjustable fresh-keeping bag storage 90 days and 115 days is respectively 97% and 90.2%, and is approaching with storage effect in the air regulating box.And whole deliquescing and rotting when the crisp good fruit rate of fruit was lower than 20%, 115 day in the time of 90 days in the common freshness protection package are because an accumulation CO in the bag
2Due to concentration is higher.Though CO in the punching bag
2Concentration is lower, but O
2Concentration height, storage effect are not good yet.
Embodiment 6
On October 2nd, 2006, the Zhanhua winter jujube of plucking from Xu Gou town, Qingxu County, Shanxi Province red area about 30%, in the air-adjustable fresh-keeping bag of packing into after the precooling, and every bag of 10kg, each is handled and repeats 3 times, and the common freshness protection package of control group is a gas impermeable bag.Test results shows, the winter jujube of the common airtight freshness protection package of packing into, and crisp good fruit rate is greater than 90% freshness date less than 1 month, many (the testing also underway) that the freshness date of air-adjustable fresh-keeping bag then will be grown, specifically data see the following form.
Table 2 air-adjustable fresh-keeping bag is to the fresh-keeping effect in Zhanhua winter jujube (Shanxi Province, place of production Qingxu County Xu Gou town)
Claims (9)
1, polyethylene fruit and vegetable air-conditioning preservation bag, be in polythene material, to add the ventilative master batch that accounts for its weight 0.1%～0.3%, on blow moulding machine, be blow molded into a film, through the ventilative master batch of light face twin rollers extruding, the tube film is squeezed into has the long finely porous permeability tube film of 1 μ m～15 μ m holes, the single radial cut air-adjustable fresh-keeping bag is made in the cutting heat-sealing again
Wherein, described ventilative master batch is the particle of being made by following raw materials by weight percent blend:
Alkaline nano porous granule 20%～30%
Nano-ZnO
20.01%～0.1%
EVA 1％～5％
LLDPE 25％～35％
LDPE 25％～35％
HDPE 6％～9％。
2, polyethylene fruit and vegetable air-conditioning preservation bag according to claim 1 is characterized in that the weight percent proportioning of described polythene material is: LLDPE: LDPE: HDPE=4: 4: 1.
3, polyethylene fruit and vegetable air-conditioning preservation bag according to claim 1 is characterized in that described alkaline nano porous granule is semicoke and/or activated clay.
4, polyethylene fruit and vegetable air-conditioning preservation bag according to claim 3, it is characterized in that described semicoke and/or activated clay are the particle of 0.015mm～0.076mm for the particle diameter by 200 mesh sieves, this particle has the aperture of 2nm～110nm, and particle diameter is 1～5 times of permeability tube film thickness.
5, polyethylene fruit and vegetable air-conditioning preservation bag according to claim 1, the thickness that it is characterized in that described permeability tube film is 0.015mm～0.02mm, the pore density on the tube film is 50～1,000,000/m
2
6, the production technology of the polyethylene fruit and vegetable air-conditioning preservation bag of claim 1 comprises:
With semicoke and/or activated clay oven dry, pulverize, by 200 mesh sieves, filter out the particle that particle diameter is 0.015mm～0.076mm;
In above-mentioned particle, add nano-ZnO
2, EVA, LDPE, LLDPE and HDPE, make ventilative master batch through the blend extruder;
In 4: 4: 1 ratios LLDPE, LDPE and HDPE are mixed, add the ventilative master batch that accounts for its weight 0.1%～0.3%, the blow moulding machine of packing into after the mixing is blow molded into a film;
Adopt light face twin rollers that the tube film is squeezed into thickness 0.015mm～0.020mm, face has 1 μ m～long micropore in 15 μ m holes, pore density 50～1,000,000/m
2Permeability tube film;
Permeability tube film through heat-sealing, cutting, is made polyethylene fruit and vegetable air-conditioning preservation bag.
7, the production technology of polyethylene fruit and vegetable air-conditioning preservation bag according to claim 6 is characterized in that adopting ultra micro wind-force comminutor selection by winnowing to go out the particle that particle diameter is 0.015mm～0.076mm.
8, the production technology of polyethylene fruit and vegetable air-conditioning preservation bag according to claim 6, it is characterized in that described ventilative master batch is to make through 150 ℃ of high temperature modified, wire drawings, pelletizing, oven dry on twin screw blend extruder, described tube film be on blow moulding machine through 175 ℃ of heating, blend, extrude, blowing makes.
9, the application of polyethylene fruit and vegetable air-conditioning preservation bag on bright jujube is fresh-keeping of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100614094A CN100532214C (en) | 2007-01-09 | 2007-01-09 | Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100614094A CN100532214C (en) | 2007-01-09 | 2007-01-09 | Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof |
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| CN100532214C true CN100532214C (en) | 2009-08-26 |
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| CN112158473B (en) * | 2020-10-27 | 2022-09-13 | 中国石油化工股份有限公司 | Fruit and vegetable air conditioning fresh-keeping bag and preparation method and application thereof |
| CN114701733A (en) * | 2022-03-28 | 2022-07-05 | 天津科技大学 | Antifog antivibration low temperature integrative case of fruit vegetables gas stress storage and transportation |
| CN114672090A (en) * | 2022-04-26 | 2022-06-28 | 干将新材料有限公司 | Air-conditioning packaging film with primary-secondary package structure and manufacturing method thereof |
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2007
- 2007-01-09 CN CNB2007100614094A patent/CN100532214C/en not_active Expired - Fee Related
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