Preservative film for short-term storage of fruits and vegetables, preparation method of preservative film and prepared preservative bag

A fresh-keeping film and fresh-keeping bag technology, applied in bags, applications, sacks, etc., can solve problems such as loss, and achieve the effects of slowing water loss, slowing down the speed of mature decay, and prolonging the time of decay.

Inactive Publication Date: 2015-01-28
ZHONGSHAN ZHENHONG PACKAGING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up: In addition to effectively killing harmful bacteria, preventing bruises, and choosing a suitable storage temperature for harvested fruits and vegetables, how to prevent water loss, slow down ethylene gas and accelerate the ripening of fruits and vegetables has become the key to keeping fruits and vegetables fresh and increasing profits Although the preservative film bags of the prior art effectively slow down the loss of moisture in fruits and vegetables, the ethylene gas released by fruits and vegetables accumulates in the closed bag, and the accumulation of ethylene gas in the closed bag accelerates fruit ripening and rot

Method used

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  • Preservative film for short-term storage of fruits and vegetables, preparation method of preservative film and prepared preservative bag
  • Preservative film for short-term storage of fruits and vegetables, preparation method of preservative film and prepared preservative bag
  • Preservative film for short-term storage of fruits and vegetables, preparation method of preservative film and prepared preservative bag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] HDPE: 30kg, copolymer of LLDPE and LDPE: 38kg; sodium carboxymethyl starch: 30kg, sulfate modified metal oxide additive A1Br 3 2kg;

[0038] The preparation steps of membrane material are as follows:

[0039] (1) The copolymer of 30kg of HDPE, 38kg of LLDPE and LDPE, 2kg of solid additive A1Br 3 Carry out thermal mixing with 30kg of modified starch sodium carboxymethyl starch to make it eutectic, and the temperature of thermal mixing is 140°C;

[0040] (2) Mixing, discharge gas and excess water during the mixing process, and then plasticize and extrude;

[0041] Mixing and extrusion adopts a granulator with an exhaust device. The exhaust device of the granulator is an exhaust pipe 2 placed vertically on the screw 1 at one end. The axis of the exhaust pipe 2 is parallel to the axis of the hopper 3. The exhaust pipe 2 is located at one end close to the die head 4, and is plasticized and extruded after removing excess moisture in the hot mixture;

[0042] (3) The extru...

Embodiment 2

[0046] LLDPE: 32kg, copolymer of HDPE and LDPE: 34kg; modified starch: 30kg, molecular sieve additives: 2kg;

[0047] The preparation steps of membrane material are as follows:

[0048] (1) 32kg of LLDPE, 34kg of copolymers of HDPE and LDPE, 2kg of molecular sieve additives and 30kg of modified starch were hot-mixed to make them eutectic, and the temperature of the hot-mixing was 120°C;

[0049] (2) Mixing, discharge gas and excess water during the mixing process, and then plasticize and extrude;

[0050] Mixing and extrusion adopts a granulator with an exhaust device. The exhaust device of the granulator is an exhaust pipe 2 placed vertically on the screw 1 at one end. The axis of the exhaust pipe 2 is parallel to the axis of the hopper 3. The exhaust pipe 2 is located at one end close to the die head 4, and is plasticized and extruded after removing excess moisture in the hot mixture;

[0051] (3) The extruded material is cut into pellets and packaged for subsequent use af...

Embodiment 3

[0055] LDPE: 40kg, copolymer of HDPE and LLDPE: 34kg; CMS industrial starch: 25kg, mixed metal salt additive AICl 3 -CuCl 2 1kg;

[0056] The preparation steps of membrane material are as follows:

[0057] (1) The copolymer of 40kg of LDPE, 34kg of HDPE and LLDPE, 1kg of mixed metal salt additive AICl 3 -CuCl 2 Hot mixing with 25kg of CMS industrial starch to make it co-melt, the temperature of hot mixing is 120°C;

[0058] (2) Mixing, discharge gas and excess water during the mixing process, and then plasticize and extrude;

[0059] Mixing and extrusion adopts a granulator with an exhaust device. The exhaust device of the granulator is an exhaust pipe 2 placed vertically on the screw 1 at one end. The axis of the exhaust pipe 2 is parallel to the axis of the hopper 3. The exhaust pipe 2 is located at one end close to the die head 4, and is plasticized and extruded after removing excess moisture in the hot mixture;

[0060] (3) The extruded material is cut into pellets a...

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Abstract

The invention discloses a preservative film for short-term storage of fruits and vegetables. A micro-foamed film body with a surface layer for slowing down water loss and adsorbing ethylene is formed on the preservative film, and the density of the film body is 0.5-0.9 g/cm<3>. The invention further discloses a preparation method of the preservative film for short-term storage of the fruits and the vegetables. The invention further discloses a preservative bag produced by using the components and the preparation method. By adopting the technical scheme of the invention, the film has sufficient adsorption capacity for ethylene gas wrapped in the film, and the adsorption capacity cannot be reduced obviously under natural ambient conditions, so that the speed of maturing and decaying the fruits and the vegetables wrapped by using the preservative film is effectively reduced, the decomposition time of the fruits and the vegetables is prolonged, the freshness of the fruits and the vegetables is guaranteed, and the decomposition of matured fruits and vegetables is also avoided; through the addition of catalysts, micro foams on the surface of the film body are promoted, the freshness of the fruits and the vegetables is guaranteed, and the maturity and decomposition of the fruits and vegetables cause by the concentration of the ethylene gas are also avoided.

Description

technical field [0001] The invention belongs to the field of packaging products. More specifically, the invention relates to a fresh-keeping film for short-term storage of fruits and vegetables, a preparation method of the fresh-keeping film and a prepared fresh-keeping bag. Background technique [0002] During the storage and transportation of harvested fruits and vegetables, due to factors such as bacteria, temperature, moisture, ethylene gas and other factors, the surface of fruits and vegetables will shrink, lose their luster, become ripe and soft, or even rot and mildew, which is called freshness loss. The methods and measures to improve or slow down the above phenomena are called freshness preservation; after harvesting, a large number of microorganisms, including bacteria, viruses, molds, etc., can be attached to the surface of vegetables and fruits, and they will be injured by rubbing or other reasons, especially when the temperature is high. When the growth rate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D30/02B65D65/02B29D7/01B29C55/28C08L23/06C08L23/08C08L3/08C08L3/04C08K3/16
CPCY02A40/90Y02W90/10
Inventor 石棣兴
Owner ZHONGSHAN ZHENHONG PACKAGING TECH
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