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PE composite fresh-keeping packaging film for food modified atmosphere packaging as well as preparation and uses thereof

A composite fresh-keeping and modified-atmosphere packaging technology, applied in the packaging of fragile items, packaging under vacuum/special atmosphere, packaging items under special gas conditions, etc. , volatile pollution of preservatives, etc., to achieve the effect of easy industrial production, adjustable thickness, and inhibition of respiration

Inactive Publication Date: 2008-06-25
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general-purpose plastic fresh-keeping materials mainly add various chemical preservatives to the plastic matrix or plastic packaging, which is likely to cause volatile pollution of the preservatives and greatly reduce the safety performance of food, and may also cause complications in material processing technology and fresh-keeping technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After the zeolite molecular sieve beta was baked at 250°C to remove moisture, quickly weigh 25 grams, put it into 500 ml of toluene, and add 0.75 g of γ-(methacryloyloxy)propyltrimethoxysilane at room temperature under the protection of nitrogen. React for 24 hours for surface treatment. Then it was filtered and washed successively with 500 ml of toluene and 250 ml of methanol, and the obtained molecular sieve was vacuum-dried at 110° C. for 1 hour. Weigh 5 grams of the molecular sieve obtained from the above treatment and add it to the mixture of 60 grams of LDPE, 30 grams of LLDPE and 4 grams of EVA, stir and mix well, then add 5 grams of stearic acid to fully mix until uniform, and use a twin-screw extruder to manufacture Granules, the four-stage extrusion granulation temperature is 170, 200, 200 and 170 ° C, and the screw speed is 30-70 rpm. The above-mentioned mixture particles were put into an extrusion blow molding machine and blown into a film. The temperatures...

Embodiment 2

[0022] After baking mesoporous molecular sieve MCM-41 at 250°C to remove water, quickly weigh 25 grams, put it into 500 ml of toluene, and add 2.5 grams of vinyltriethoxysilane to react at room temperature for 24 hours under the protection of nitrogen for surface deal with. Then it was filtered and washed successively with 500 ml of toluene and 250 ml of methanol, and the obtained molecular sieve was vacuum-dried at 110° C. for 1 hour. Weigh out 1.5 grams of the molecular sieve obtained from the above treatment, add it to 98 grams of LDPE, stir and mix, then add 0.5 grams of sorbitol and mix until uniform, and use a twin-screw extruder to granulate, four-stage extrusion granulation temperature 170, 200, 200 and 170°C, the screw speed is 30-70rpm; put the above mixture particles into the extrusion blow molding machine to blow into a film, the temperature of the four sections of the extrusion blow molding machine is 170, 195, 195 and 170°C, the pulling speed is 4.5rpm. The thi...

Embodiment 3

[0025] After the carbon molecular sieve was baked at 250°C to remove moisture, quickly weigh 25 grams, put it into 500 ml of toluene, and add 1.5 grams of γ-glycidyl ether propyl trimethoxysilane, and react at room temperature for 24 hours under the protection of nitrogen to carry out the surface deal with. Then it was filtered and washed successively with 500 ml of toluene and 250 ml of methanol, and the obtained molecular sieve was vacuum-dried at 110° C. for 1 hour. Weigh out 20 grams of the molecular sieve obtained from the above treatment, add it to a mixture of 22.5 grams of LDPE, 37.5 grams of LLDPE and 15 grams of EVA, stir and mix well, then add 5 grams of glycerin and mix until uniform, and use a twin-screw extruder to granulate , the extrusion granulation temperature is 170-200°C, and the screw speed is 30-70rpm. The above-mentioned mixture particles were put into an extrusion blow molding machine and blown into a film. The temperatures of the four stages of the ex...

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Abstract

The invention discloses a PE composite preservative packaging membrane for modified atmosphere packaging of foods and a preparation method, which aims at providing a packaging membrane capable of adjusting the gas compositions in the pack so as to further extend the shelf life of the fresh foods. The packaging membrane is prepared through the following raw materials according to a certain weight percentage: 75 per cent to 98 per cent of polymer substrates, 1.5 per cent to 20 per cent of molecular sieves and 0.5 per cent to 5 per cent of plasticizers. By utilizing the molecular sieves as active inorganic particles, the PE composite preservative packaging membrane of the invention ensures that the membrane has favorable permeability, moisture permeability and porosity and is capable of spontaneously adjusting the gas compositions in the pack so as to suppress the respiration of the fresh foods and extend the freshness period of the fresh foods. The invention also discloses a preparation method for PE composite preservative packaging membrane and the packaging membrane prepared through the method has the advantages of uniform membrane, adjustable thickness, tear resistance, impact resistance, high heat sealing strength, simple processing technique, and convenient realization of industrialized production, etc.

Description

technical field [0001] The invention relates to the field of food fresh-keeping packaging materials, and more specifically relates to a PE composite fresh-keeping packaging film suitable for fresh food packaging and its preparation method and application. Background technique [0002] The export of my country's agricultural and sideline products to participate in international market competition has become an important way to increase farmers' income, improve their lives and build a harmonious society. The export of agricultural and sideline products inevitably involves the strong guarantee of product freshness preservation and related packaging technology. The development and breakthrough of functional fresh-keeping materials and related fresh-keeping technologies have gradually become the key issues urgently needed to be solved in the field of agricultural products' post-harvest value-added and agricultural products. At present, the general-purpose plastic fresh-keeping m...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L23/06C08K5/54B29C49/04B65D81/20B65D85/34C08L23/08C08K3/34C08K5/10
Inventor 黄震杨传民苏峻峰郭玉花滕立军
Owner TIANJIN UNIV OF COMMERCE
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