Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof

A polyethylene fruit and vegetable, modified atmosphere preservation technology, applied in bags, sacks, transportation and packaging, etc., can solve problems such as difficulties and can not meet the preservation of freshness, and achieve the effect of reducing rot, promoting development and extending shelf life

Inactive Publication Date: 2009-08-26
山西三水渗水膜科技发展中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing storage facilities such as cold storage, controlled atmosphere storage, decompression equipment, etc. have difficulty fully meeting the above conditions, and cannot meet the requirements for CO 2 Preservation of sensitive fresh dates and other fruits

Method used

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  • Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof
  • Polyethylene gas-exchange fresh-keeping bag for fruit and vegetable, manufacturing process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 5kg of activated clay and 5kg of semi-coke, mix them evenly, and then dry them. Firstly, they are pulverized by a mine ball mill, and then wind-selected by an ultra-fine wind pulverizer. After passing through a 200-mesh sieve, 8kg of particles with a particle size of no more than 0.076mm are selected.

[0039] Add 18g nano ZnO to the above particles 2 , 0.8kgEVA, 8kgLDPE, 8kgLLDPE and 2kgHDPE, mixed evenly, loaded into SJSH-30 twin-screw blending extruder, modified at 150℃, drawn, pelletized and dried to make breathable masterbatch.

[0040] Mix 40kg LLDPE, 40kg LDPE and 10kg HDPE, add 0.27kg air-permeable masterbatch, mix evenly, put it into SJM-F1600 blow molding machine, heat, blend, extrude and blow mold at 175°C to make a tube film.

[0041] Using the mechanical damping extrusion technology with smooth surface rollers, the tube film is extruded into a thickness of 0.015mm-0.020mm, a pore length of 1μm-15μm, and a micropore density of 500,000-1,000,000 / m 2 per...

Embodiment 2

[0044] Take 5kg of activated clay and 5kg of semi-coke, mix them evenly, and then dry them. Firstly, they are pulverized by a mine ball mill, and then wind-selected by an ultra-fine wind pulverizer. After passing through a 200-mesh sieve, 8kg of particles with a particle size of no more than 0.076mm are selected.

[0045] Add 10g nanometer ZnO to the above particles 2 , 1kgEVA, 10kgLDPE, 10kgLLDPE and 2kgHDPE, mixed evenly, loaded into SJSH-30 twin-screw blending extruder, modified at 150℃, drawn, pelletized and dried to make breathable masterbatch.

[0046] Mix 40kg LLDPE, 40kg LDPE and 10kg HDPE, add 0.15kg air-permeable masterbatch, mix evenly, put it into SJM-F1600 blow molding machine, heat, blend, extrude and blow mold at 175°C to make a tube film.

[0047] Using the mechanical damping extrusion technology with smooth surface rollers, the tube film is extruded into a thickness of 0.015mm-0.020mm, a pore length of 1μm-15μm, and a micropore density of 500,000-1,000,000 / m ...

Embodiment 3

[0050] Take 10kg of activated clay, after drying, first pulverize it with a mine ball mill, and then use an ultra-fine wind pulverizer to winnow, pass through a 200-mesh sieve, and select 8kg of particles with a particle size of no more than 0.076mm.

[0051] Add 12g nano ZnO to the above particles 2 , 0.8kgEVA, 8kgLDPE, 8kgLLDPE and 2kgHDPE, mixed evenly, loaded into SJSH-30 twin-screw blending extruder, modified at 150℃, drawn, pelletized and dried to make breathable masterbatch.

[0052] Mix 40kg LLDPE, 40kg LDPE and 10kg HDPE, add 0.15kg air-permeable masterbatch, mix evenly, put it into SJM-F1600 blow molding machine, heat, blend, extrude and blow mold at 175°C to make a tube film.

[0053] Using the mechanical damping extrusion technology with smooth surface rollers, the tube film is extruded into a thickness of 0.015mm-0.020mm, a pore length of 1μm-15μm, and a micropore density of 500,000-1,000,000 / m 2 permeable membrane. After finishing the hole-forming process on th...

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Abstract

The invention relates to a polyethylene air-modified fresh-keeping bag for fruits and vegetables. The polyethylene material is added with breathable masterbatch, blown into a tube film, and extruded by a smooth-facing roller machine to form a permeable tube film with micropores of 1 μm to 15 μm. , to make a fresh-keeping bag with a film thickness of 0.015mm-0.02mm, a micropore density of 500,000-1 million / m2, and an air permeability of 15min-70min / (100mm×100mm·20g·1.013×105Pa), in which the air-permeable masterbatch contains alkali nanoporous particles. The modified atmosphere fresh-keeping bag of the present invention can discharge CO2 in the bag and effectively suppress O2 while moisturizing, so that the modified atmosphere and moisturizing can be realized at the same time, and an ideal fresh-keeping effect can be achieved. The shelf life of the modified atmosphere fresh-keeping bag of the invention is extended by more than 7 days than that of the common fresh-keeping bag, and the refrigerated fresh-keeping period is extended by 1 to 2 months than the common fresh-keeping bag. The modified atmosphere fresh-keeping bag of the present invention is particularly suitable for fresh-keeping of fresh jujubes.

Description

technical field [0001] The invention relates to the technical field of fresh-keeping of fruits and vegetables, in particular to a fresh-keeping bag of controlled atmosphere fruits and vegetables. The invention also relates to the production process and application of the modified atmosphere fresh-keeping bag. Background technique [0002] Fruits and vegetables are indispensable food for human beings. Since fruits and vegetables are living organisms, they still breathe after picking and have metabolic activity, so their preservation is particularly important. There are many kinds of fruit and vegetable preservation. Polyethylene blown film as fruit and vegetable packaging has been widely used all over the world. However, because ordinary polyethylene blown film is airtight and impermeable, it is easy to cause CO in the packaging during the storage of fruits and vegetables. 2 Concentration is too high and not conducive to preservation. [0003] At present, the most common m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D30/02B65D81/18B29C55/28B29C43/24B29B9/06B31B23/00C08L23/08C08K7/00
Inventor 姚建民
Owner 山西三水渗水膜科技发展中心
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