CN102863685B - Fresh-keeping packaging material for tomatoes - Google Patents
Fresh-keeping packaging material for tomatoes Download PDFInfo
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- CN102863685B CN102863685B CN201210363822.7A CN201210363822A CN102863685B CN 102863685 B CN102863685 B CN 102863685B CN 201210363822 A CN201210363822 A CN 201210363822A CN 102863685 B CN102863685 B CN 102863685B
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Abstract
The invention relates to a fresh-keeping packaging material for tomatoes and belongs to packaging materials. The packaging material is of a single-layer structure and is a film formed by melt blending of one or more of LDPE (low-density polyethylene), LLDPE (linear low-density polyethylene) and HDPE (high-density polyethylene) serving as matrix resin with 15-50wt% of amorphous polymers prior to blow molding, wherein the amorphous polymers are one or more of styrene-butadiene segmented copolymers, ethylene propylene diene monomer rubber, ethylene/octene copolymers, polybutadiene, natural rubber and ethylene-vinyl acetate copolymers. The fresh-keeping packaging material for the tomatoes has special fresh-keeping effect for the tomatoes and can enable the tomatoes to turn red completely but still keep hard, and the storage life of the tomatoes in a full ripe stage at the normal temperature (25 DEG C) can be longer than 60 days.
Description
Technical field
The invention belongs to wrapping material, relate to a kind of antistaling film mainly for tomato and preparation method thereof.
Background technology
Tomato is one of main agricultural-food of China, and domestic the South and the North all has plantation, and only the cultivated area of Xinjiang region reaches more than 110 ten thousand mu, and tomato yield more than 5,000,000 tons, is produced 1,000,000 tons of tomato-sauce.
" tomatine " that tomato contains, has the effect of anti-bacteria; The oxysuccinic acid, citric acid and the carbohydrate that contain, peptic function; The organic acid such as oxysuccinic acid and citric acid in tomato, increases gastric acidity in addition, helps digest, and adjusts the effect of gastrointestinal function; In tomato, contain tartaric acid in addition, can reduce the content of cholesterol, very helpful to hyperlipidemia; It goes back the various trace elements such as rich vitamin A, vitamins C, vitamin V 1, Lin Suanna Vitamin B2 Sodium Phosphate and carotene and calcium, phosphorus, potassium, magnesium, iron, zinc, copper and iodine, also contains protein, carbohydrate, organic acid, Mierocrystalline cellulose.
High and the low price of tomato nutrient composition, is liked by the common people deeply.But tomato belongs to berry fruit vegetables, thin, the easy dehydration of skin and storage tolerance not.Generally only can descend at normal temperatures 15-30 days, and also shorter (in table 1) of shelf lives at low temperatures.
The ripening degree of table 1 tomato and shelf lives
| Storing temp (℃) | Green ripe stage 14-16 ℃ | First ripe phase 7-10 ℃ | Ripening stage 0-5 ℃ |
| Storage time | 1-3 week | 4-7 days | 1-3 week |
Should go on the market in season on the occasion of tomato in China the 7-8 month every year, but owing to lacking preservation technique, cause tomato at source to sell, cause large quantities of tomatoes to overstock, selling price is low, and rotting rate is very high, is therefore badly in need of a kind of Freshkeeping Packaging and solves the storage problem of tomato, to meet the needs of long-distance transport.
Summary of the invention
The present invention proposes a kind of wrapping film with suitable ventilation property and preparation method thereof.The present invention has special fresh-keeping effect to tomato, can make fruit turn red but fruit is still harder comprehensively, and (25 ℃) shelf lives reaches more than 60 days the tomato in full ripe stage at normal temperatures.
The technical solution used in the present invention is as follows for achieving the above object.
A kind of tomato fresh-keeping packaging material, it is characterized in that, these wrapping material have single layer structure, with Low Density Polyethylene (LDPE), linear low density polyethylene (LLDPE), one or more in high density polyethylene(HDPE) (HDPE) are matrix resin, with the film that after 15-50wt% amorphous polymer melt blending, blowing forms, amorphous polymer is styrene-butadiene block copolymer (SBS), terpolymer EP rubber (EPDM), ethylene-octene copolymer (POE), polyhutadiene (PB), natural rubber (NR), one or more in ethylene-vinyl acetate (EVA).
The overall proportion of amorphous polymer in system generally between 15-50wt%, preferably 25-30%.
Common thickness is the polyethylene film of 20-50 micron, and its oxygen transmission rates (OTR) generally only has 1000-3000ml/m
2dayatm; And the about 20-26ml/kghr of the respiratory rate of tomato at 25 ℃, if use the fresh-keeping tomato of common polyethylene film, breathe needed oxygen because common polythene film can not see through tomato, must cause tomato anaerobic respiration, make tomato old and feeble and dead rotten rapidly; The polyethylene film that utilizes styrene-butadiene block copolymer (SBS), terpolymer EP rubber (EPDM), ethylene-octene copolymer (POE), polyhutadiene (PB), natural rubber (NR), ethylene-vinyl acetate (EVA) modification, its OTR can be increased to 10000-100000ml/m
2between dayatm, and carbonic acid gas (CO
2) transmitance of gas reaches 100000-200000ml/m
2between dayatm, the freshness protection package of preparing with the polyethylene film of this amorphous polymer modification, in the time of fresh-keeping tomato, just make tomato in the freshness protection package atmosphere in a hypoxemia (3-5%) and low carbon dioxide (2-3%), and this atmosphere just can slow down the respiratory rate of tomato, delay the maturation of tomato and the loss of nutritive substance, can not cause again the anaerobic respiration of tomato.The antistaling film that utilizes the present invention to prepare, storing when tomato, just forms one and is beneficial to the fresh-keeping modified-atmosphere package system of tomato, more than making the shelf life extension to 60 day of tomato.
The overall proportion of the amorphous polymer such as rubber and EVA in polyvinyl resin is generally at 15-50%(w%) between, preferably 25-30%.
The preferred 10-50 micron of thickness of above-mentioned tomato fresh-keeping packaging material.
The antistaling film that the present invention mentions has single layer structure, has manufacturing process simple, feature with low cost.
The freshness protection package of this film preparation has higher OTR and carbonic acid gas percent of pass, can meet respiratory requirement under the fruits and vegetables normal temperature that tomato etc. has medium respiratory intensity, and maintain lower oxygen concentration and gas concentration lwevel, form the closed system of a spontaneous controlled-atmosphere, suppress the ripe and old and feeble of the fruits and vegetables such as tomato, shelf-lives and the shelf lives of the tomato of greatly improving.
The ventilation property of this film is according to adding the kind of amorphous polymer and ratio in polyvinyl resin and different, to be applicable to the requirement of different sorts preserving fruit and vegetable utilizing.
Polyethylene and rubber are all that country allows the directly wrapping material of contact food that use, and wrapping material of the present invention meet food safety relevant laws and regulations.
Embodiment
By following specific embodiment and application example, the invention will be further described.Following specific descriptions are for the ease of understanding the present invention, are not used for limiting the scope of the invention.
1. tomato antistaling film preparation
1.1 raw material
Antistaling film is prepared raw materials and is required as follows: the HDPE of commodity, LDPE, LLDPE, SBS, POE, EPDM, EVA, PB, the resins such as NR.
The preparation of 1.2 tomato antistaling films
By after the amorphous polymer physical blendings such as W1 part LDPE, W2 part LLDPE, W3 part HDPE and W4 part SBS, W5 part POE, W6 part EPDM, W7 part EVA, W8 part PB, W9 part NR, melt blending at 150-210 ℃, prepare modified polyvinyl resin, then be prepared into as required the PE modified film of 10-50 micron, be prepared into as required the freshness protection package of certain size.
The test of 2 pairs of tomato fresh keeping properties
Take on farm to have no mechanical damage, turned the red and harder tomato in full ripe stage without courses of infection, fruit, be placed on acrylic plastering pallet, then pack in the tomato freshness protection package and contrast bag of manufacturing of the present invention.Each sack fills the tomato of 1000 grams of left and right, then seal sack, under the room temperature of 25 ℃, place, detect oxygen and gas concentration lwevel in the interior atmosphere of decayed fruit rate, hardness and the total sugar content (TSS) of tomato and the changing conditions of vitamins C (Vc) content and packing bag head space.
The structure of comparative example 1 and embodiment 1-5 freshness protection package forms and the fresh-keeping effect of tomato is shown in Table 2.
Table 2. preservative film composition and the fresh-keeping effect (0-3 ℃, after 16 days) to strawberry
Experimental result explanation, comparative example 1 is common PE film, tomato is deposited after 7 days and all rots in this freshness protection package; And embodiment 1-5, the ventilation property of prepared freshness protection package can meet the respiratory needs of tomato, and in freshness protection package, forms the environment of a hypoxemia, low carbon dioxide concentration, has reduced the respiration of tomato, slow down the aging of tomato, kept the quality of tomato.
Those skilled in the art should understand, above preferred embodiment just illustrates of the present invention, is not construed as limiting the invention.Technical scheme of the present invention is carried out to various variations and equivalence replacement, and do not deviate from principle and the scope of technical solution of the present invention, all should be encompassed among the scope of the claims in the present invention.
Claims (2)
1. a tomato fresh-keeping packaging material, it is characterized in that, these wrapping material have single layer structure, with Low Density Polyethylene (LDPE), linear low density polyethylene (LLDPE), one or more in high density polyethylene(HDPE) (HDPE) are matrix resin, with the film that after amorphous polymer melt blending, blowing forms, amorphous polymer is styrene-butadiene block copolymer (SBS), terpolymer EP rubber (EPDM), ethylene-octene copolymer (POE), polyhutadiene (PB), natural rubber (NR), one or more in ethylene-vinyl acetate (EVA), the overall proportion of amorphous polymer in system is 25-30%.
2. according to a kind of tomato fresh-keeping packaging material claimed in claim 1, it is characterized in that, the thickness of wrapping material is 10-50 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210363822.7A CN102863685B (en) | 2012-09-26 | 2012-09-26 | Fresh-keeping packaging material for tomatoes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210363822.7A CN102863685B (en) | 2012-09-26 | 2012-09-26 | Fresh-keeping packaging material for tomatoes |
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| Publication Number | Publication Date |
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| CN102863685A CN102863685A (en) | 2013-01-09 |
| CN102863685B true CN102863685B (en) | 2014-06-18 |
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| CN201210363822.7A Active CN102863685B (en) | 2012-09-26 | 2012-09-26 | Fresh-keeping packaging material for tomatoes |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104026217B (en) * | 2013-03-06 | 2016-01-20 | 北京印刷学院 | A kind of fruit and vegetable fresh-keeping agent cartridge bag of controlled release and the preparation method of packaging film |
| CN104109275A (en) * | 2013-04-22 | 2014-10-22 | 北京印刷学院 | Fresh-keeping packaging material with controllable gas adjusting function and preparation method thereof |
| CN103450547B (en) * | 2013-08-23 | 2015-07-15 | 苏州欢颜电气有限公司 | PE (Poly Ethylene) preservative film and preparation method thereof |
| US10125247B2 (en) | 2014-05-29 | 2018-11-13 | Exxonmobil Chemical Patents Inc. | Polyethylene compositions |
| WO2015183577A1 (en) | 2014-05-29 | 2015-12-03 | Exxonmobil Chemical Patents Inc. | Cyclic-diene additives in polyethylene films and enhanced film orientation balance in production thereof |
| US10077344B2 (en) | 2014-05-29 | 2018-09-18 | Exxonmobil Chemical Patents Inc. | Polyethylene films and production of such films |
| CN104910489A (en) * | 2015-06-13 | 2015-09-16 | 常州大学 | High-density polyethylene microporous membrane with molecular sieve function |
| CN105082666B (en) * | 2015-09-06 | 2018-03-09 | 浙江金石包装有限公司 | A kind of composite membrane and composite membrane preparation method |
| CN106928535B (en) * | 2015-12-30 | 2020-01-07 | 中国石油天然气股份有限公司 | Preparation method of soluble ethylene propylene rubber packaging film |
| WO2018182943A1 (en) | 2017-03-29 | 2018-10-04 | Exxonmobil Chemical Patents Inc. | Polyethylene compositions |
| CN107487535A (en) * | 2017-07-04 | 2017-12-19 | 北京印刷学院 | Function integrates fresh-keeping packaging bag and the application in intensive shadow on lung is fresh-keeping |
| CN107254098A (en) * | 2017-07-07 | 2017-10-17 | 刘昌华 | Preservative film containing capsaicine and its application in food fresh keeping |
| CN107985798A (en) * | 2017-11-14 | 2018-05-04 | 北京印刷学院 | A kind of citrus fresh-keeping packaging bag |
| CN108100440A (en) * | 2017-11-14 | 2018-06-01 | 北京印刷学院 | A kind of packaging bag for loquat and banana fresh-keeping |
| CN107826502A (en) * | 2017-11-14 | 2018-03-23 | 北京印刷学院 | A kind of mango room temperature storage freshness protection package |
| CN115251148B (en) * | 2022-08-04 | 2024-02-02 | 北京市农业技术推广站 | Storage and preservation method for tomato strings |
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| CN101205306B (en) * | 2007-12-07 | 2011-03-23 | 天津商业大学 | PE composite fresh-keeping packaging film for food modified atmosphere packaging as well as preparation and uses thereof |
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Effective date of registration: 20210127 Address after: 100089 1005, 1st floor, area A8, block D, Xisanqi culture and Technology Park, 27 xixiaokou Road, Qinghe Xiaoying, Haidian District, Beijing Patentee after: Beijing Jianzhen fresh keeping Technology Co.,Ltd. Address before: 102600 No. 25 Xinghua North Road, Huangcun village, Beijing, Daxing District Patentee before: BEIJING INSTITUTE OF GRAPHIC COMMUNICATION |
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