Light-blocking PE (polyethylene) film for food packaging
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A food packaging and light-blocking technology, which is applied in the field of food packaging materials, can solve the problems of increased light oxidation reaction to product hazards, riboflavin addition, etc., and achieve the effect of inhibiting photoaging
Inactive Publication Date: 2012-07-25
JIANGNAN UNIV
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Problems solved by technology
However, the simple use of transparent packaging will increase the harm of light oxidation reaction to the product, so it is necessary to study new transparent packaging materials with light blocking effect.
At present, there is no report on adding riboflavin to PE light-transmitting film
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Embodiment 1
[0020] (1) Take 25g of riboflavin (product number 67001734, produced by Sinopharm Chemical Reagent Co., Ltd.), and take 25000g of PE masterbatch (Q / 3201-BYC-01 low-density polyethylene , produced by Yangzi Petrochemical-BASF Co., Ltd.), mix the two evenly, and place them in a double-roller plastic refining machine (SK-160B double-roller plastic refining machine, produced by Shanghai Rubber Machinery Factory) for plastic refining and extrusion. Outlet temperature 130°C;
[0021] (2) Take 6.5g of extruded material and put it in the center of the two pressure plates (the size of the inner template of the pressure plate is 20cm×14cm, and the thickness is about 350μm), and place the pressure plate on the flat vulcanizing machine (XLB-Q500×500×2 flat vulcanizing machine, Manufactured by Wenlin Chemical Machinery Factory, Jiangyin City, Jiangsu Province), the hot pressing temperature is 155°C, the hot pressing pressure is 0.4Mpa, and pre-pressed for 4 minutes under these conditions, ...
Embodiment 2
[0024] (1) Take 25g of riboflavin (product number 67001734, produced by Sinopharm Chemical Reagent Co., Ltd.), and take 5000g of PE masterbatch (Q / 3201-BYC-01 low-density polyethylene , produced by Yangzi Petrochemical-BASF Co., Ltd.), mix the two evenly, and place them in a double-roller plastic refining machine (SK-160B double-roller plastic refining machine, produced by Shanghai Rubber Machinery Factory) for plastic refining and extrusion. Outlet temperature 140°C;
[0025] (2) Take 6.5g of extruded material and put it in the center of the two pressure plates (the size of the inner template of the pressure plate is 20cm×14cm, and the thickness is about 350μm), and place the pressure plate on the flat vulcanizing machine (XLB-Q500×500×2 flat vulcanizing machine, Manufactured by Wenlin Chemical Machinery Factory, Jiangyin City, Jiangsu Province), the hot-pressing temperature is 165°C, and the hot-pressing pressure is 0.6Mpa. Under these conditions, it is pre-pressed for 3 min...
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Abstract
The invention relates to a light-blocking PE (polyethylene) film for food packaging, which is used for packaging food. Through the addition of riboflavin as a photosensitizer to PE master batch, the blocking performance of the PE film to the illumination at a specific wave band, the contact between the illumination at a specific wave band and the PE film is blocked, and the illumination oxidation of the packed food is retarded. A preparation method of the light-blocking PE film comprises the following steps: (1) mixing the PE master batch and riboflavin, placing into a double-roll plastic mixing mill for plastication, wherein the extrusion temperature is 130-140 DEG C; (2) placing extruded stock in the middle of two independent press plates, placing the press plates into a press vulcanizer, prepressing at a hot pressing temperature of 155-165 DEG C under a hot pressing pressure of 0.4-0.6MPa for 3-4min to melt the extruded stock, and uniformly distributing the melted extruded stock into the press plates; and (3) setting the pressure of the press vulcanizer to 10-11MPa, keeping hot pressing for 3-4min, taking out the press plates, placing into a pressure forming machine, and pressing under a pressure of 4.5-5.5MPa at room temperature for 5-6min. Through the addition of the photosensitizer riboflavin to the PE master batch, the absorption performance of the PE film to illumination is improved, the contact between the illumination and the packed food is blocked, and the illumination oxidation of the food is retarded.
Description
technical field [0001] The invention relates to the technical field of food packaging materials, in particular to a preparation method and application of a polyethylene film. Background technique [0002] At present, food packaging is developing in the direction of transparency. This is because firstly, the use of transparent packaging is more convenient for consumers to choose before purchasing, and secondly, the social awareness of environmental protection has increased, and the use of aluminum foil and aluminum plating will gradually decrease. However, the simple use of transparent packaging will increase the harm of light oxidation reaction to the product, so it is necessary to study new transparent packaging materials with light blocking effect. [0003] Light-induced lipid oxidation can be described as the photosensitizer existing in the product itself is excited by light and ground state oxygen ( 3 o 2 ) react to form singlet oxygen ( 1 o 2 ),compared to 3 o 2 ,...
Claims
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